JP2009264296A - Blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower device having a nozzle tip whose direction can be changed easily without inclining a body. <P>SOLUTION: This blower device includes a drive device, a fan rotated by the drive device, and a discharge pipe including a plurality of detachable and attachable cylindrical members for guiding air flow generated by fan to a desired direction. A projection part is formed at an outer circumference side of a connection part of one cylindrical member which is detached and attached, and an attachment groove fitting with the projection part is formed at an outer circumference side of another cylindrical member. The attachment groove comprises an axial groove formed in the axial direction from an opening of a connection part, and two circumferential grooves branching and extending to both sides in the circumferential direction from a tip side of the axial groove, and have substantially T-shape in a view from an outer circumference side. When the cylindrical members are attached, one cylindrical member is pushed in another cylindrical member in the axial direction and is rotated clockwise or counterclockwise to position the projection part in either of the circumferential grooves of the substantially T-shape. Consequently, attachment angle of the cylindrical member can be changed by 90 degrees. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a blower device used for a work for blowing fallen leaves, cut grass, and the like by rotating a fan with an engine and blowing out sucked air from a discharge port.

  Conventionally, as this type of blower apparatus, for example, in Patent Document 1, a structure in which a fan in the apparatus is rotated by driving an engine and air sucked from an intake port of the housing is ejected from an exhaust port of the housing is known. ing. A conventional blower device and its usage will be described with reference to FIGS. The blower device 101 driven by driving means such as a two-cycle or four-cycle engine has a pipe 119 and a nozzle 118 attached to the exhaust port of the fan, and the nozzle 118 is blown while holding the blower device 101 by holding the handle portion 107. They are blown by wind pressure toward the fallen leaves and cut grass that are the objects.

  In addition, as shown in FIG. 33, the blower apparatus 101 has a vacuum pipe 155, an extension pipe 156, and a suction pipe 157 attached to the suction port side, and a dust collecting bag 159 attached to the discharge port side via a vent pipe 158, A method of sucking cut grass and collecting it in the dust collecting bag 159 is also possible.

JP 2001-140800 A

  In the conventional blower device 101, since the direction of the nozzle 118 could not be changed, in order to change the direction of the bent nozzle 118, it is necessary to tilt the blower device body, and there is a demand for improving operability. was there.

  The objective of this invention is providing the blower apparatus which can change the direction of the nozzle of a front-end | tip easily without inclining a blower apparatus main body.

  Another object of the present invention is to provide a blower device that can change the direction of the nozzle at the tip without detaching the connected nozzle or pipe.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, there is provided a discharge pipe including a driving device, a fan rotated by the driving device, and a plurality of detachable cylindrical members for guiding air generated by the fan in a desired direction. In the blower device having, a protruding portion is formed on the outer peripheral side of the connecting portion of one of the cylindrical members to be attached and detached, and an attachment groove that fits the protruding portion is formed on the outer peripheral side of the other cylindrical member. The mounting groove is composed of an axial groove formed in the axial direction from the opening of the connecting portion and two circumferential grooves extending from the tip end side of the axial groove to both sides in the circumferential direction. When the shape of the projection is substantially T-shaped, one cylindrical member is pushed axially with respect to the other cylindrical member and rotated clockwise or counterclockwise. It was positioned in the circumferential groove. The holding position in the circumferential groove is preferably the end of the groove. The total length of the plurality of circumferential grooves that branch off from the front end side of the axial groove is a length corresponding to about 90 degrees in the circumferential direction. In particular, each circumferential groove has a circumferential length. The length is preferably about 45 degrees in the direction of rotation angle. Since this length must take into account the diameter of the protrusion, it is strictly 90 degrees + diameter or 45 degrees + diameter. Here, these are about 90 degrees, about It is called 45 degrees. Further, the rotation angle is not limited to 90 degrees or 45 degrees, and may be set to any other angle.

According to still another feature of the present invention, the plurality of cylindrical members are nozzles that deflect the air flow sending direction, and the nozzles are formed with connecting portions in which mounting grooves are formed. The cylindrical member is a cylindrical pipe, and a connection portion provided with a plurality of protrusions is formed on one end side of the pipe, and a connection portion provided with a mounting groove is formed on the other end side. The opening of the connecting portion protrudes outward in the circumferential direction from the opening, and a groove inlet serving as an end portion of the axial groove is formed. A plurality of protrusions are provided in the connection portion on the downstream side of the air flow of the cylindrical member, and a mounting groove is formed in the connection portion on the upstream side.
A step portion having a groove depth or a groove width changed is formed in a circumferential groove extending from the tip end side of the axial groove to both sides in the circumferential direction. The cylindrical member is provided with a mark indicating the circumferential position of the protruding portion, and the position to be provided is preferably in the vicinity of the connecting portion provided with a plurality of protruding portions. This mark may be formed integrally with the cylindrical member, may be a figure or a character drawn on the cylindrical member, or may be a seal member attached to the cylindrical member.

  According to the first aspect of the present invention, the mounting groove includes an axial groove formed in the axial direction from the opening of the connecting portion, and two circumferential directions extending branched from the distal end side of the axial groove to both sides in the circumferential direction. Since it is composed of grooves and the shape when viewed from the outer periphery side is substantially T-shaped, simply push the connected cylindrical member in the axial direction and rotate it clockwise or counterclockwise Since it can fix in either of two groove | channels, a cylindrical member can be rotated, without removing.

  According to the second aspect of the present invention, the total length of the plurality of circumferential grooves is about 90 degrees in rotation in the circumferential direction, so the main body portion and the tubular shape of the blower device can be removed without removing the tubular member. The relative angle of the member can be easily set at a position of 0 degree or 90 degrees.

  According to the third aspect of the present invention, the circumferential grooves branched and extending from the tip end side of the axial groove have a length of about 45 degrees in the circumferential direction. Since the rotation angle of the member is as small as 45 degrees, the attaching / detaching operation is facilitated.

  According to the invention of claim 4, the cylindrical member includes a nozzle for deflecting the air flow sending direction, and the nozzle is formed with the connecting portion in which the mounting groove is formed, so that the air is directed toward the blower object. It is possible to send out the beam deflected in any direction.

  According to the invention of claim 5, the cylindrical member is a cylindrical pipe, the pipe is provided with a connecting portion provided with a plurality of projecting portions on one end side, and the mounting groove is provided on the other end side. Since the formed connecting portion is formed, an arbitrary number of annular members can be connected, and the length of the discharge pipe can be arbitrarily extended.

  According to the invention of claim 6, the opening of the connecting portion protrudes outward in the circumferential direction, and a groove inlet serving as an end of the axial groove is formed, and the groove inlet is separated by 180 degrees in the circumferential direction at the opening. Since it is provided in the place, the cylindrical member can be fixed at four places every 90 degrees.

  According to the seventh aspect of the present invention, a plurality of protrusions are provided in the connection portion on the downstream side of the air flow of the cylindrical member, a mounting groove is formed in the connection portion on the upstream side, and the shape of each cylindrical member is Since they are unified, the cylindrical members can be easily connected.

  According to the invention of claim 8, since the step portion in which the depth of the groove or the width of the groove is changed is formed in the circumferential groove extending and diverging from the tip side of the axial groove to both sides in the circumferential direction. It serves as a stopper when the protruding portion is positioned in the circumferential groove, and the cylindrical member can be stably fixed.

  According to the ninth aspect of the present invention, the mark indicating the circumferential position of the protruding portion is provided in the vicinity of the connecting portion provided with the plurality of protruding portions of the cylindrical member. The relative positional relationship can be easily grasped, and it can be easily recognized which direction the cylindrical member should be rotated.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, parts having the same function are denoted by the same reference numerals, and repeated description is omitted. Further, in the specification, the front and rear directions and the up and down directions are defined to refer to the directions shown in FIG. 2 unless otherwise specified.

  FIG. 1 is a perspective view showing an entire blower apparatus 1 according to an embodiment of the present invention. 2 is a left side view of the blower device 1 according to the embodiment of the present invention, and FIG. 3 is a side view showing a state where the nozzle 18 is rotated 90 degrees from the state of FIG. The blower device 1 mainly includes a main housing 2, a two-cycle or four-cycle engine (not shown) housed in the main housing 2, a fan housing 3 that houses a fan for blowing air to be described later, and a fan The dust cover 4 that covers the suction port formed in the housing 3 and a discharge pipe portion for discharging the wind generated by the fan are configured. In the present embodiment, the discharge pipe portion 1b is an example constituted by a discharge pipe of the blower apparatus main body, two detachable pipes 19 and a nozzle 18. Two leg portions 6a and 6b are formed at the lower part of the main housing 2 and the fan housing 3, and a leg portion 6c also serving as a handle is attached to the side of these leg portions.

  A handle portion 7 for carrying the blower device 1 and holding it during work is formed on the upper portion of the housing. The handle portion 7 can be gripped and operated as shown in FIG. Further, if the blower device 1 is tilted sideways and the handle portion 7 is gripped by the right hand and the leg portion 6c is gripped by the left hand, the angle of the nozzle 18 at the tip can be rotated by 90 degrees, and there are various holdings depending on the work environment You can.

  In FIG. 2, the blower device 1 is roughly composed of a main body 1a and a discharge pipe 1b. In the configuration shown in the drawing, the discharge pipe portion 1b includes a discharge pipe (described later) formed in the main body portion 1a, two pipes 19, and a nozzle 18 attached to the tip (front end) thereof. However, the discharge pipe portion 1b is not limited to this configuration. In addition to the discharge pipe of the main body portion 1a, the combination of an arbitrary number of pipes 19 and nozzles 18, an arbitrary number of pipes 19, or a nozzle Only 18 is acceptable. Each of the discharge pipe, the pipe 19 and the nozzle 18 of the main body 1a is formed with a connecting portion for connecting each other, and these are configured to be detachable. FIG. 3 shows a state in which the nozzle 18 attached to the front end from the state of FIG. 2 is rotated 90 degrees with respect to the pipe 19 behind it.

  FIG. 4 is a perspective view showing the main body 1a of the blower device 1 according to the embodiment of the present invention, and FIG. 5 is a perspective view showing a state in which the dustproof cover 4 is opened. A throttle trigger 8 is provided below the handle 7 of the main body 1a, and a throttle adjustment lever 9 that can hold the throttle in an arbitrary position is provided on the front left side surface of the handle 7. On the right side of the main housing 2, an engine (not shown) is accommodated, and a slit 5 for discharging heat from the engine is formed. A fan housing 3 that covers a fan 11 (FIG. 5) and forms a flow path that guides an air flow generated by the fan 11 in the circumferential direction is attached to the left side of the main housing 2. A discharge pipe 17 of the blower device 1 is formed on the front side of the main body 1a, and air discharged by the fan 11 is discharged forward from the discharge pipe 17. The cylindrical discharge pipe 17 is formed by the main housing 2 on one side in the axial direction and formed by the fan housing 3 on the other side, and a plurality of ribs 81, 82, 83, 84 are formed on the respective inner peripheral portions. Is done. On the outer peripheral surface of the discharge pipe 17, protrusions 14 for attaching a duct to be described later are provided at two positions separated by 180 degrees. The dust cover 4 is fixed to the fan housing 3 so that it can be opened and closed by a mounting shaft 10, and is fixed in a screw hole 4 c by a screw (not shown) in the closed state.

  A plurality of ribs 3 a and 3 b (FIG. 5) provided with notches are formed in the vicinity of the outer edge of the dust cover 4 of the fan housing 3. When the dust cover 4 is closed, the fan housing 3 and the dust cover 4 are closed. An opening 3c serving as an air flow path is formed between the two. Furthermore, the dust-proof cover 4 is formed with slits 4a and 4b that allow air to pass therethrough and prevent large dust from entering. The dustproof cover 4 serves not only for dustproofing but also as a protector for preventing foreign matter from entering the rotating fan 11.

  As shown in FIG. 5, the dustproof cover 4 can be opened about 120 degrees in rotation angle around the mounting shaft 10, and a switch unit 48 is provided in the vicinity of the mounting portion. The switch unit 48 is a so-called safety switch that prevents the engine from operating with the suction port 13 open. When the dust cover 4 is closed, the projection 4d abuts against the switch unit 48 to switch the switch unit 48. By turning on, the engine can be operated when the dust cover 4 is closed. Further, as shown in FIG. 33, when the vacuum pipe 155 is set in the suction port 13, the push rib formed on the vacuum pipe 155 contacts the switch unit 48 to turn on the switch, thereby preventing dust. The engine can be operated even when the cover 4 is open.

  The suction port 13 is a cylindrical opening extending from the fan housing 3 in the axial direction of the fan 13, and three protruding portions 13 a extending in the axial direction are formed in three circumferential directions near the opening, and the dust cover 4 is closed. Even at times, the air can be sucked from the gap between the protruding portions 13a. Such a shape of the suction port 13 can be easily manufactured by molding integrally with the fan housing 3 with plastic, for example.

  FIG. 6 is a left side view showing a state in which the dust cover 4 of the main body 1a of the blower device is closed, and FIG. 7 is a side view showing a state in which the dust cover 4 of the main body 1a is opened. In FIG. 6, the fan housing 3 is fixed to the main housing 2 by five screws, 15a, 15b, 15c, 15d and 15e (FIG. 7). The attachment shaft 10 of the dust cover 4 is fixed to the fan housing 3 with screws 52. The attachment shaft side wall 3e is a rib-like member formed to extend to the side of the fan cover 3.

  In FIG. 7, a connecting portion 16 is formed on the distal end side of the discharge pipe 17, and an annular projecting stopper 16a for positioning the end portion of the pipe 19 to be mounted is formed.

  FIG. 8 is a left side view showing a state where the dust cover 4 and the fan housing 3 of the main body 1a are removed. For example, the fan 11 which is a centrifugal fan is directly or indirectly fixed to a crankshaft of an engine (not shown). The fixing method is, for example, using bolts 71. In FIG. 8, the fan 11 rotates counterclockwise to generate an air flow in the circumferential direction, and generates a strong air flow in the direction indicated by the arrow in the figure depending on the shape of the housing. The discharge pipe 17 is formed with a plurality of ribs 81 and 82 for improving the strength of the housing. The ribs 81 and 82 can not only improve the strength of the discharge pipe 17 of the main housing 2 but also have an air flow rectifying effect. The shape of the ribs 81 and 82 will be described later.

  FIG. 9 is a perspective view showing the shapes of the pipe 19 and the nozzle 18 according to the embodiment of the present invention. The pipe 19 has connection portions 19a and 19c formed at both ends of the main body portion 19b. The main body portion 19b is a cylindrical, straight or substantially straight pipe, and a plurality of long ribs 23a formed at regular intervals in the circumferential direction and a plurality of long ribs 23a in the longitudinal direction (in this figure, 4) A short rib 23b to be formed and a position mark 23c for indicating the position of the protrusion 20 are formed. The long ribs 23a and the short ribs 23b are formed to prevent slipping and improve strength, and are integrally formed when the resin pipe 19 is formed.

  The connection portion 19a on the rear end side of the pipe 19 is formed with two L-shaped attachment grooves 22 having a substantially L shape when viewed from the side surface in the circumferential direction. The connecting portion 19c on the front end side of the pipe 19 has a small outer diameter so as to be connected to another pipe 19 or the nozzle 18 to be connected, and two protruding portions 20 are formed. The L-shaped mounting groove 22 and the projecting portion 20 are integrally formed when a resin pipe is molded. For example, the pipe 19 is formed by separately molding a half circumference with plastic resin or the like. A cylindrical pipe 19 can be manufactured by joining together.

  The nozzle 18 has a deflecting portion 18c having a narrowed tip (front end), and a connecting portion 18a connected to the pipe 19 is formed at the rear end. Between the connection part 18a and the deflection | deviation part 18c, it has the bending part 18b for making a discharge pipeline bend at a desired angle (this embodiment about 10 degree | times). The connecting portion 18a is formed with a T-shaped mounting groove 21 having a substantially T-shape when viewed from the side. Here, the “groove” means a state (shape) seen from the inner peripheral side of the nozzle 18 and the pipe 19 and, as can be understood from the drawing, looks like a protrusion when viewed from the outer peripheral side.

  FIG. 10A is a perspective view showing details of the nozzle 18 according to the present embodiment. FIG. 10 (2) schematically shows the shape of the T-shaped mounting groove 21. FIG. As shown in (2), the T-shaped mounting groove 21 has an axial groove 27 extending in the longitudinal direction from the groove inlet 25 and a branch from the vicinity of the front end of the axial groove 27 to the left and right, and at a circumferential angle in the circumferential direction. It is a substantially T-shaped form formed by two circumferential grooves 26 extending about 90 degrees. In FIG. 10, for convenience of explanation, the axial groove 27 and the circumferential groove 26 are drawn apart from each other. However, as can be understood from FIG. It is. A step 28 (see FIG. 10A) having a low groove depth is formed in the vicinity of the diameter of the protruding portion 20 from the left and right ends of the circumferential groove 26. By the step portion 28, the protruding portion 20 is stably held near the end portion. Further, since the stepped portion 28 has a low depth on the outer peripheral side because the depth of the groove is low, the stepped portion 28 has a shape that can easily hold the low portion by hand when the nozzle 18 is rotated by hand.

  FIG. 10 (3) is a diagram showing the shape of a conventional nozzle 18a. The nozzle 18a is formed with an L-shaped mounting groove 22 having a substantially L-shape when viewed from the side. The shape of the L-shaped mounting groove 22 extends from the longitudinal groove in one circumferential direction, and the cross section is L. It is a letter shape. Further, since there are only two groove inlets 25 in the opening, the nozzle 18a and the pipe 19 are attached in only two states, a normal state (relative angle 0 degree) and an inverted state (relative angle 180 degrees). Therefore, in the conventional nozzle 18a, it is necessary to incline the main body 1a of the blower device 1 by 90 degrees in a situation where it is desired to discharge the air vertically and vertically, which may be difficult for the operator.

  On the other hand, in the nozzle 18 of the present embodiment shown in FIG. 10 (1), the nozzle 18 can be rotated by 90 degrees relative angle from the normal state only by rotating the nozzle 18, so that it can be used under any circumstances. The direction of the nozzle can be set to a desired rotation angle.

  FIG. 11 (1) is a side view (right) of the nozzle 18. In the step portion 24 of the nozzle 18, the outer diameter of the nozzle is narrowed. This is because when the pipe 18 is inserted in the connecting portion, the inner diameter of the pipe 18 and the inner diameter of the deflecting portion 18c are the same. On the bottom surface of the nozzle 18, a bottom raised portion 30 is formed at a substantially central portion of a flat surface. This is because the lower surface of the nozzle opening at the tip of the nozzle 18 is in contact with the ground or pierced into the ground even when the nozzle 18 is in contact with the ground when the blower operation is performed with the nozzle 18 along the ground. This is to prevent it from happening.

  FIG. 11B is a rear view seen from the rear end side of the nozzle 18. In the opening of the connecting portion 18a, two groove inlets 25 are formed at positions 180 degrees apart, and the inner diameter of the groove inlet 25 is increased. FIG. 11 (3) is a cross-sectional view taken along the line DD in (1) and shows the shape of the mounting groove 21. Here, the projecting portion 20 of the pipe 19 is held at two locations in the circumferential groove of the T-shaped mounting groove 21. For this reason, two step portions 28 are formed, and the depth of the groove at that portion is determined. It is shallow. Further, since the two holding positions held by the stepped portion 28 are separated by about 90 degrees in rotation angle, the nozzle 18 is rotated without removing the nozzle 18 from the pipe 19, so that the orientation of the nozzle 18 is changed. It is possible to change. As described above, in the present embodiment, even when wind that spreads in the vertical direction is required, the blower device 1 does not have to be laid sideways, which improves usability.

  FIG. 12 is a diagram showing a connection state between the nozzle 18 and the pipe 19, (1) shows a normal state, and (2) shows that the nozzle 18 is rotated 90 degrees counterclockwise from the state (1). The state (3) shows a state in which the pipe 19 is once removed from the state (1), rotated 180 degrees, and then reattached.

  As described above, according to the mounting groove shape of the present embodiment, two circumferential grooves can be obtained simply by pushing the connected nozzle 18 in the axial direction and rotating it in either the clockwise or counterclockwise direction. 26, the nozzle 19 can be rotated by about 90 degrees without being removed. In addition, the circumferential grooves 26 branched and extending from the distal end side of the axial groove 27 have a length of about 45 degrees in the circumferential direction, and therefore the angle at which the cylindrical member is rotated during attachment / detachment. Can be as small as 45 degrees, so the attaching / detaching operation becomes easy.

  In this embodiment, the T-shaped mounting groove 21 is provided in the nozzle 18, but it may be provided in the same manner on the pipe 19 side. The same effect can be obtained by providing the nozzle 18 with the L-shaped mounting groove 22 and providing the T-shaped mounting groove 21 only on the pipe 19 side.

  Next, the shape of the nozzle opening 31 of the nozzle 18 will be described with reference to FIG. FIG. 13 (1) is a perspective view seen from the tip (front end) direction of the nozzle 18, and (2) is a diagram for explaining the jet wind from the nozzle opening 31. . In (1), the nozzle opening 31 is formed with a raised portion 32 having a substantially parallel and thinly drawn shape as a base, and a shape in the vicinity of the upper center that largely protrudes upward. The raised portion 32 continuously extends from the nozzle opening 31 in the direction of the bent portion 18b (longitudinal direction), and fold lines 33 are formed on both sides of the raised portion 32. Although the fold 33 is not an essential component, the strength of the nozzle 18 can be increased by adding the fold 33. The lower side of the nozzle opening 31 is a substantially horizontal straight portion 31a. Thus, by making the lower side a horizontal straight line, it becomes easy to bring the nozzle 18 close to the ground, and the discharged air can be efficiently blown onto the object.

  FIG. 13 (2) is a diagram showing the state of wind arrival when air is blown along the ground surface in the shape of the nozzle opening 31 shown in (1), and the wind reaches the shaded area. Indicates. In the case of this cross-sectional shape, the reach range of the wind is as shown by the diagonal line in (2). The horizontal axis indicates the spread of the nozzle opening 31 in the width (lateral) direction, and the distance indicates the distance in front of the nozzle opening 31. In the case of the nozzle opening 31, since a large amount of wind flows out from the vicinity of the central raised portion 32, only the central portion reaches far. Note that the opening 131 having a known shape as shown in FIG. 14A is linear on the upper side and the lower side. In this shape, as shown in (2), although the lateral spread of the jet wind is sufficient, the reach range of the wind near the center is insufficient.

  Next, the nozzle shape of the present invention will be further described with reference to FIG. FIG. 15 (1) shows the nozzle shape of the embodiment described in FIG. 13 (1). In (1), in order to facilitate explanation of the shape, a black circle mark is given to the bending point where the shape changes in the outline. The outline of the nozzle opening 31 has a straight portion 31a on the lower side and straight portions 31b and 31c on both sides on the upper side. The straight portions 31b and 31c are parallel or substantially parallel to the straight portion 31a. Between the straight part 31a and the straight part 31b, a raised part 32 that rises upward is formed. Here, the bulge means that it protrudes outward (upward) from the straight portions 31b and 31c on both sides. In (1), the bulge is bulged in a gentle arc shape. The straight portion 31a and the straight portion 31b, and the straight portion 31a and the straight portion 31c are connected by the side portions 34a and 34b, but the shapes of the side portions 34a and 34b may be curved as shown in the figure, However, it may be any shape that is smooth or smooth.

  FIG. 15 (2) shows a nozzle opening 35 according to another embodiment. In the present embodiment, two raised portions 32a and 32b are formed on both sides of the straight portion 35a formed in the upper central portion. If comprised in this way, the reach | attainment distance of a wind can be made slightly short only near the center part.

  FIG. 15 (3) shows a nozzle opening 36 according to yet another embodiment. In the present embodiment, there is only one straight portion 36a on the upper side, and the raised portion 33c is formed offset to one side instead of the central portion. If comprised in this way, the reach | attainment distance of only one specific place can be extended, implement | achieving the breadth of the horizontal direction of an arrival wind like the past.

  FIG. 15 (4) shows a nozzle opening 37 according to yet another embodiment. In the present embodiment, the configuration is basically the same as (1), and two linear portions 37a and 37b are formed on the upper side. However, the shape of the raised portion 33d is not an arc but a cross section is a triangle, and a corner is formed at the upper end.

  FIG. 15 (5) shows a nozzle opening 38 according to yet another embodiment. In the present embodiment, two inclined straight portions 38a and 38b are formed on the upper side. A raised portion 33e is formed between the two straight portions 38a and 38b. The raised portion 33e has an arc shape that rises upward. With this shape, it is possible to gradually reduce the lateral spread of the reaching wind while extending the reach distance of the air flow toward the front side of the central portion.

  As described above, according to the present embodiment, the cross-sectional shape of the nozzle opening is such that the lower shape is a straight line and the upper shape has a raised portion (protruding portion) protruding upward, so that the center of the nozzle Since the air flow near the part increases and the reach distance of the wind becomes long only near the central part, an air flow suitable for blowing fallen leaves and cut grass can be generated. In particular, if the raised portion is formed near the upper center, the reach of the air flow to the front side of the central portion can be extended.

  Next, a switch mechanism that prevents the engine from operating when the dust cover 4 is opened will be described. Prior to describing an embodiment of the present invention, a conventional switch mechanism will be described with reference to FIGS. FIG. 16 is a perspective view showing the arrangement of the switch mechanism in the conventional blower apparatus 101. 17 (1) and 17 (2) are perspective views showing an assembled state of a conventional switch mechanism. 18A is a cross-sectional view of a conventional switch mechanism, and FIG. 18B is a diagram showing an operating state of the switch mechanism when a vacuum pipe 155 is attached.

  In FIG. 16, an opening / closing cover (not shown) provided to be openable / closable around the attachment shaft is fixed by an attachment shaft (not shown) provided at the attachment position 110. The conventional switch mechanism is attached at a position about 90 degrees away from the attachment position 110 as can be understood from FIG. The switch mechanism is fixed to the fan housing 103 by fixing the switch cover 150 with two screws 144. FIG. 17 (2) shows a state in which the screw 144 is removed from the state of FIG. 17 (1) and the screw switch cover 150 is removed. Inside the switch cover 150, a push-type switch 151 having a plunger 151a is provided. The switch 151 is turned on when the plunger 151a is pushed, and turned off when the plunger 151a returns to the original position. A switch lever 148 for pushing the plunger 151a is provided on the front surface of the plunger 151a, that is, on the inner peripheral side of the suction port 113.

  FIG. 18 (1) shows a state where the switch lever 148 is not pushed (a state where the switch is OFF). 18 (2) shows a state in which the vacuum pipe 155 is inserted into the suction port 13 in the direction of the arrow. In this state, the switch lever 148 is pushed by the outer periphery of the vacuum pipe 155, and the switch 151 As a result, the switch 151 is turned on, and a voltage supply circuit to the ignition plug of the engine is formed. Although not shown, when the dust cover is closed, the switch lever 148 is pushed on the side of the dust cover, like the vacuum pipe 155.

  As described above, in the conventional switch mechanism, the installation location is provided at a location that is approximately 90 degrees away from the mounting shaft by the rotation angle. Further, the direction in which the plunger 151a is pushed did not coincide with the moving direction of the dust cover.

  Next, a switch mechanism according to an embodiment of the present invention will be described with reference to FIGS. FIG. 19 is a diagram showing an arrangement state of the switch unit 48 according to the embodiment of the present invention. The switch unit 48 is provided between the dustproof cover 4 and the suction port 13 in an open state. That is, the switch unit 48 is provided in the vicinity of the dust-proof cover mounting shaft 10 to reduce the risk of erroneous operation of the switch unit 48 when the dust-proof cover 4 is opened. As described above, since the switch unit 48 is provided in a place that is difficult to access by the dust cover 4, there is an advantage that malfunctions are reduced as compared with the conventional switch structure.

  For example, the switch unit 48 is preferably configured to be completely or partially included in a region connecting the maximum diameter of the suction port 13 and the maximum width of the attachment shaft side wall 3e of the dustproof cover.

  FIG. 20 is a perspective view of a switch cover 50 that is one of the parts constituting the switch unit 48. The switch cover 50 connects the main body portion 50c of a substantially rectangular parallelepiped covering the entire upper side of the switch, the contact portion 50a provided at the front end of the main body portion 50c, the contact portion 50a and the main body portion 50c, and applies a force applied to the contact portion 50a. It has a bent part 50b for damping, two arm parts 50d extending in the direction opposite to the attaching part 50a of the main body part 50c, and an attaching shaft penetrating part 50e for fixing the switch cover 50 with the attaching shaft 50. . With the above configuration, the switch cover 50 is fixed so as to be swingable about the mounting shaft 10. The attachment shaft 10 is a shaft to which the dust cover 4 is attached, and penetrates the attachment shaft through portion 4e of the dust cover. Since the switch cover 50 is also mounted using the mounting shaft 10, the number of parts for mounting the switch can be reduced, and the manufacturing cost can be kept low. Since the dustproof cover 4 opens about 90 degrees or more around the mounting shaft 10 when opened, if the switch cover 50 is mounted using the mounting shaft 10 as well, the switch cover 50 is also greatly opened along with it, and the inside There is a risk that the switch housed in the will fall off. Therefore, in the present embodiment, the stopper portion 50f is formed at the rear end of the attachment shaft penetrating portion so that the switch cover 5 can be moved from several degrees to several ten degrees even when the dust cover 4 is opened. Restricted to prevent the switch from falling off.

  FIG. 21 is a cross-sectional view showing a cross section taken along the line BB in FIG. The upper part of the push-type switch 51 is covered with a switch cover 50, and the lower part and the side part are held by ribs 54a and 54b protruding from the fan housing. The dust cover 4 is urged by the spring 39 in the direction in which the dust cover 4 is opened so as to maintain the state when the dust cover 4 is opened. In the present embodiment, the spring 39 is used to urge the switch cover 10 in the same direction, that is, the direction in which the switch is released. With this configuration, it is not necessary to separately provide spring means for biasing the switch cover 50 in order to turn off the switch 51, and the number of parts can be further reduced.

  22 is a cross-sectional view showing a cross-section of the CC section of FIG. 7, (1) is a view showing a state where the dust cover 4 is opened, and (2) is a state where the dust cover 4 is closed. FIG. 22 to 23, the vertical direction is based on the illustrated direction.

  The push-type switch 51 is disposed so as to be surrounded by a plurality of switch mounting ribs 53 a, 53 b, 53 c formed integrally with the fan housing 3, and the top thereof is covered with a switch cover 50. One side of the switch cover 50, that is, the attachment shaft penetrating portion 50 e is held by the attachment shaft 10 of the dust cover 4 so as to be swingable. The mounting shaft 10 is fixed by screws 52 (see FIG. 6) between ribs 53d and 53e formed integrally with the fan housing 3. In the fan housing 3, an attachment shaft side wall 3 e for covering the periphery of the attaching portion of the dustproof cover is formed integrally with the fan housing 3. At the tip of the switch cover 50, a contact portion 50a is disposed so as to protrude from the rib 53a to the suction port 13 side.

  In a state where the dust cover 4 is opened, a clockwise force acts on the switch cover 50 around the mounting shaft 10 and the plunger 51 of the switch 51 moves away. As a result, the switch 51 is in the OFF state. Become. The switch cover 50 may be moved by a spring 39 attached to the mounting shaft 10, may be moved by the restoring force of the plunger 51a of the switch 51, or An independent spring or other pressing means for moving the switch cover 50 may be provided.

  ON / OFF of the switch 51 is connected to, for example, an ignition circuit of the engine. When the switch 51 is turned OFF, supply of high-voltage current to the ignition plug of the engine is cut off, and the engine cannot be operated. With this configuration, the engine cannot be started with the dustproof cover 4 left open. Further, when the engine is in operation, the engine automatically stops when the dust cover 4 is opened.

  FIG. 22 (2) is a diagram showing a state where the dust cover 4 is closed. When the dust cover 4 is closed, the protrusion 4d integrally formed on the inside of the dust cover 4 comes into contact with the contact portion 50a, so that the switch cover 50 moves slightly counterclockwise, and the plunger 51a is pushed. Then, the switch 51 is turned on.

  Next, the operation of the switch unit 48 when the vacuum pipe 55 is attached to the suction port 13 will be described with reference to FIG. FIG. 23 (1) is a diagram showing a state in which the vacuum pipe 55 is attached to the suction port 13, and (2) is a diagram showing a state in which the vacuum pipe 55 is attached. In order to attach the vacuum pipe 55, first, the dust cover 4 is opened, and the vacuum pipe 55 is inserted into the suction port 13 in this state. A protrusion 55a is integrally formed on the outer periphery of the vacuum pipe 15, and when inserted to a predetermined position, the protrusion 55a pushes the contact portion 50a of the switch cover 50 downward as shown in FIG. The plunger 51a is pushed and the switch 51 is turned on. In this case, since the dustproof cover 4 is urged by the spring 39 in the closing direction, the dustproof cover 4 is pressed against the vacuum pipe 55, and the dustproof cover 4 does not flutter during work.

  As described above, according to the switch unit 48 according to the present embodiment, the movement direction of the plunger 51a of the switch 51 is the same as the opening / closing direction of the dust cover 4 and the attachment direction of the vacuum pipe 55. And can be operated reliably. Further, since the switch unit 48 is provided in the vicinity of the mounting shaft 10, that is, between the suction port 13 and the mounting shaft 10, the switch means is mounted at a location where it is difficult for the operator to touch and access when the dust cover 4 is opened. Therefore, there is less risk of touching the switch accidentally or hitting the vacuum pipe 55 or the like. Therefore, the reliability and life of the switch unit 48 can be extended.

  Further, since the switch unit 48 is mounted using the mounting shaft 10 and the switch 51 is held by a holding portion formed in the housing, it is not necessary to prepare a dedicated member for holding the switch 51. Since another member for mounting the switch unit 48 can be reduced, the number of necessary parts can be reduced and the cost can be reduced.

  Further, the dust cover 4 has a protrusion 4d that turns on the switch when closed, and the switch unit 48 and the protrusion 4d are located in the vicinity of the dust cover mounting shaft 10, so that the dust cover 4 is attached from the shaft to the protrusion. The switch 51 is not turned ON / OFF due to the deformation of the dustproof cover 4, or the protrusion 4d is excessively pressed against the switch cover 50, and the reliability of the ON / OFF operation of the switch is improved. Can be improved. Moreover, since the protrusion 4d is located at a location close to the mounting shaft, access to the protrusion 4d is hindered. Also from this point, the reliability of the ON / OFF operation of the switch can be improved.

  In this embodiment, the switch 51 is turned on when the switch cover 50 is pressed. However, the present invention is not limited to this, and the switch 51 is turned off when the switch cover 50 is pressed. Even if it does, the same effect will be acquired if it is set as the circuit structure which cannot drive | operate an engine at the time of OFF. For the same reason, the type of the switch 51 used is not limited to the push type, but may be of other types.

  Next, the attachment structure of the fan 11 according to the embodiment of the present invention will be described with reference to FIGS. First, prior to describing the embodiment of the present invention, a mounting structure of a conventional fan 169 will be described with reference to FIG.

  FIG. 24A is a perspective view showing the shape of the fan 111 according to the prior art, and FIG. 24B is a cross-sectional view showing a mounting structure of the fan 111. In FIG. 24 (1), the fan 111 is a so-called centrifugal fan, which guides air sucked in the axial direction to the outside in the radial direction and discharges it in the circumferential direction. For this purpose, a plurality of fins 169 extending in the radial direction are formed. A flat circular region is formed on the inner peripheral side of the fan 111, and screw holes 176 for fixing the fan 111 are formed at two locations near the outer periphery of this region.

  In FIG. 24 (2), the flywheel 161 is fixed to the crankshaft 173 of the engine by bolting. A plurality of fins 174 for cooling the engine are formed on the engine side of the flywheel 161. Two screw hole inlets are formed in a protruding shape at the front end of the flywheel 161, and the fan 111 is fixed by two screws 177, so that the rear end face of the fan 111 and the flywheel 161 are in contact with each other in the axial direction. If the fan 111 is fixed in this way, the fan 111 is fixed at two places in the circumferential direction, so that the runout is unlikely to occur. However, in this fixing method, a planar circular region is formed on the inner peripheral side of the fan 111, and the fin 169 is not provided in that region, so the efficiency of the fan 111 is not sufficient. Further, it is necessary to enlarge the fan 111 in order to secure the air volume.

  In view of this, the present invention improves the shape of the fan and its mounting structure. FIG. 25 is a perspective view showing the shape of the fan 11 according to the embodiment of the present invention. A through hole 75 and a circular flat region 70 are formed at the center of the fan 11. The flat region 70 is formed for attaching a washer 75 (see FIG. 26) for reinforcement at the time of attachment, and the size thereof may be smaller than the circular region of the prior art shown in FIG. Since the flat region 70 has such a small diameter, the fin 69 can be formed so as to extend greatly from the outer periphery to the inner periphery, so that the air volume can be increased while the fan 11 has the same outer diameter. Efficiency can be increased. The fan 11 can be made of a polymer resin such as plastic or a metal.

  FIG. 26 is a cross-sectional view showing the mounting structure of the fan 11. The fan 11 according to the present embodiment is fixed to the mounting member 72 by bolts 71 via an annular washer 75 on the front side and the rear side of the through hole 75. The attachment member 72 is attached to the crankshaft 73 of the engine. A plurality of fins 74 are formed on the rear end surface of the flywheel 61, a protrusion 64 is formed on the front end, and the cylindrical portion 65 extends to the inner peripheral side of the protrusion on the rear end side of the fan 11. That is, both the projecting portion 64 and the cylindrical portion 65 are in contact with each other in the radial direction.

  FIG. 27 is a side view of the attachment portion of the fan 11. In this figure, the description of the main housing 2 is omitted for convenience of explanation. A magnet 62 is attached to the outer peripheral side of the flywheel 61 to determine the timing for supplying a high-voltage current to a spark plug (not shown) by detecting its rotational position.

  Next, the EE cross section of FIG. 27 is demonstrated using FIG. FIG. 28 is a view showing the EE cross section and a state where the flywheel 61 is viewed from the EE cross section. Two protrusions 64 are integrally formed at the front end of the flywheel 61. Further, the fan 11 is formed with a cylindrical portion 65 extending from the rear surface 11 a and a plurality of ribs 66 that are molded integrally with the cylindrical portion 65 and extend radially outward from the cylindrical portion 65. Here, the inner shape of the two projecting portions 64 is an arc shape along the outer diameter of the cylindrical portion 65, and both are in contact with each other when the runout of the fan 11 occurs. Serves to limit movement in the circumferential direction. Therefore, the projecting portion 64 and the cylindrical portion 65 may be in contact with each other from the normal time, or may be arranged so as to be in non-contact with each other at a slight distance and in contact with each other when the runout occurs. As described above, the cylindrical portion 65 and the rib 66 are provided in contact with each other in the circumferential direction, and these restrict the movement of the fan 11 in the circumferential direction when the fan 11 rotates relative to the flywheel 61. When a slip occurs, the movement can be effectively limited.

  FIG. 29 is a diagram illustrating a state in which the fan 11 is viewed from the FF cross section of FIG. 27 and the FF cross section. The rib 66 extends in the axial direction to the rear surface 11a of the fan 11. The rear surface 11a is formed with a recess 68 having a partially reduced axial thickness, and as a result, a plurality of radially extending ribs 67 are formed.

  As described above, according to the mounting structure of the fan 11 according to the present embodiment, the projecting portion 64 and the cylindrical portion 65, which are members in contact with each other in the radial direction, overlap each other in the radial direction in the cross section perpendicular to the axial direction. Thus, even if fan runout occurs, the fan contacts each other and restricts the movement of the fan in the radial direction. Therefore, vibration and shake of the fan can be effectively prevented. Moreover, since the protrusion part 64 is provided continuously or discontinuously in the circumferential direction, the shape and arrangement of the radial contact part can be determined in accordance with the shape of the flywheel 61 and the fan 11, so that It can be easily manufactured by integral molding. Moreover, the number of parts can be reduced by manufacturing by integral molding.

  In addition, the attachment structure of the fan 11 by this invention is not limited to description of embodiment, A various deformation | transformation is possible. For example, although it provided in two places of the circumferential direction as the protrusion part 64, you may provide three or more places. Moreover, you may provide continuously rather than intermittently providing in the circumferential direction. Further, although the protruding portion 64 is disposed on the outer peripheral side of the cylindrical portion 65, it may be provided on the inner peripheral side of the cylindrical portion 65. Furthermore, although the cylindrical portion 65 has a shape that is continuous in the circumferential direction, a notch or the like may be provided to make the shape non-continuous, and a contact member may be provided only at a location that contacts the cylindrical portion 65.

  Next, the several ribs 81-84 provided in the inner peripheral side of the discharge pipe 17 are demonstrated using FIG. 30 is a view for explaining the ribs 81 to 84, (2) is a view (front view) of the AA portion of FIG. 6, and (1) is a GG cross section of (2). Fig. 3 (3) is a cross-sectional view taken along the line H-H of (2). White arrows in the figure indicate the direction of air flow.

  30 (2), the discharge pipe 17 is formed integrally with the main housing 2 at the left half of the front view, and formed integrally with the fan housing 3 at the right half of the front view, and the discharge pipe 17 is formed by combining them. Is done. On the main housing 2 side, a rib 81 and a rib 82 are formed on the top and bottom, respectively. The main housing 2 is manufactured by integral molding using a resin such as plastic, for example, but it is preferable in terms of strength if the ribs 81 and 82 are also integrally molded. Here, the ribs 81 and 82 are configured to extend in a direction perpendicular to the housing dividing surface. This configuration is convenient not only for integrally molding the ribs 81 and 82 together with the molding of the housing, but also because this direction is parallel to the rotation axis of the fan 11 and is preferable for air rectification purposes. Similarly, the ribs 83 and 84 are manufactured by integral molding with the fan housing 3 using a resin such as plastic, and the direction thereof is a direction extending in the vertical direction with respect to the housing dividing surface.

  Here, as can be understood from FIG. 30 (2), the ribs 81 and 83 are formed on the upper side of the two protruding portions 14 formed on the outer peripheral side of the discharge pipe 17, and the ribs 82 and 84 are formed on the discharge pipe 17. Are formed on the lower side of the two protrusions 14 formed on the outer peripheral side. That is, each rib is formed one by one between the protruding portion and the dividing surface when viewed in the circumferential direction of the discharge pipe 17. By arranging in this way, even if a strong force is applied from the outside of the discharge pipe and a force that causes the discharge pipe to be crushed, it is not crushed by the reinforcing action of each rib, and a strong discharge pipe structure is obtained. realizable. In addition, the thickness of each rib and the vicinity of the housing is gradually increased as it approaches the mounting, and it is configured to be continuous with the inner wall of the housing in a smooth shape. Can be formed.

  Furthermore, another effect is also produced by forming the plurality of ribs 81 to 84. For example, since the plurality of ribs 81 to 84 protrude, it becomes difficult for large dust to enter from the discharge pipe 17 when the blower device 1 is not in operation. If the purpose of preventing foreign matters such as dust is important, the number of ribs may be increased or the interval may be reduced. Further, as another effect, it is possible to provide a rectifying effect of discharged air. If the shape, position, length, width, thickness and the like of each of the ribs 81 to 84 are determined in consideration of the rectifying effect, the air in the discharge pipe can be discharged with a more uniform pressure. In FIG. 30, it can be understood that the shapes of the ribs 81 to 84 are greatly different between the upper ribs 81 and 83 shown in (1) and the lower ribs 82 and 84 shown in (2). It will also be understood that the width d1 of the rib 81 and the width d3 of the rib 83 are not the same in the upper rib.

  Next, the ribs 81 to 84 will be further described with reference to FIG. 31 (2) is a front view of the AA portion of FIG. 6, (1) is a cross-sectional view taken along the line II of (2), and (3) is a cross-sectional view taken along the line JJ of (2). is there. Here, as can be understood from FIG. 31 (1), the length L1 of the upper rib 81 and the length L2 of the rib 82 are different, and the rib 82 is longer. Further, the distance p 1 from the opening of the discharge pipe 17 to the downstream end of the rib 81 is different from the distance p 2 from the opening to the downstream end of the rib 82. Further, the shape of the rib 81 on the upstream end 81 a side is not the same as the shape of the rib 82 on the upstream end 82 a side. These are all shapes determined in consideration of the distribution of the airflow flowing through the discharge pipe 17. Furthermore, it is preferable that the downstream ends 81b and 82b of the ribs 81 and 82 are rounded so as not to disturb the air flow. As shown in (3), the shape of the ribs 83 and 84 on the fan housing 3 side (left side) is the same, and if designed in the same concept as the shape of the ribs 81 and 82 on the main housing 2 side (right side). good.

  As described above, according to the present embodiment, since the plurality of ribs 81 to 84 extending from the inner peripheral wall are provided on the inner side of the discharge pipe 17, the appearance is not impaired at all and the rigidity of the discharge pipe can be increased. it can. Further, since the ribs 81 to 84 are configured to extend in a direction perpendicular to the dividing surface of the housing, the ribs 81 to 84 can be formed easily by being integrally formed with the main housing 2 and the fan housing 3. Further, since the ribs 81 to 84 are configured to extend in a direction parallel to the rotation axis of the fan 11, the air flow collected outside in the radial direction of the fan 11 is guided uniformly by the ribs 81 to 84. Can do.

  Furthermore, according to this embodiment, since the ribs 81 to 84 do not contact each other, the rigidity can be increased without hindering the flow of the dust collection target when used as a dust collector. Moreover, since the length, width | variety, and attachment position of the ribs 81-84 differ, respectively, a rib can be set according to the uneven distribution of an air flow.

  The ribs 81 to 84 according to the embodiment of the present invention have been described above. However, the arrangement and configuration of the rib are not limited to this embodiment, and various modifications can be made. For example, the interval between the rib 81 and the rib 83 and the rib 82 and the rib 84 can be further narrowed or conversely widened. Moreover, you may make it contact these ribs. However, if they are in contact with each other, if they are used to suck the fallen leaves and cut grass as shown in FIG. 33 and store them in the dust collecting bag 159, the fallen leaves and cut grass may be clogged. Above, the shape should be determined. Furthermore, in this embodiment, the direction of each rib is a direction extending in a direction perpendicular to the housing dividing surface, but may be a shape extending in the direction of the center point of the discharge pipe 17 having a circular cross section. Further, the number of ribs is not limited to the number of the present embodiment (four), and may be any number. The ribs are provided separately on the upstream side and the downstream side of the air flow. Also good.

  As mentioned above, although this invention was demonstrated based on each embodiment, this invention is not limited to the above-mentioned embodiment, A various change is possible within the range which does not deviate from the meaning.

It is a perspective view showing the whole blower device concerning the embodiment of the present invention. It is a left view of the blower device concerning the embodiment of the present invention. It is a side view of the blower device concerning the embodiment of the present invention, and shows the state where the nozzle 18 was rotated 90 degrees compared with the state of FIG. It is a perspective view which shows the main-body part 1a of the blower apparatus which concerns on embodiment of this invention. It is a perspective view which shows the state which opened the dustproof cover 4 of the main-body part 1a of the blower apparatus which concerns on embodiment of this invention. It is a side view which shows the state which closed the dustproof cover 4 of the main-body part 1a of the blower apparatus which concerns on embodiment of this invention. It is a side view which shows the state which opened the dustproof cover 4 of the main-body part 1a of the blower apparatus which concerns on embodiment of this invention. It is a side view which shows the state which removed the dust-proof cover 4 and the fan housing 3 of the main-body part 1a of the blower apparatus which concerns on embodiment of this invention. It is a perspective view which shows the shape of the pipe 19 and the nozzle 18 which concern on embodiment of this invention. (1) is the perspective view which shows the detail of the nozzle 18 which concerns on embodiment of this invention, (2) is the figure which showed typically the shape of the T-shaped attachment groove 21, (3) is based on a prior art example. It is a perspective view which shows the detail of the nozzle 18a. It is a side view (right) of the nozzle 18 which concerns on embodiment of this invention, (2) is a rear view seen from the rear end side of the nozzle 18, (3) is a cross section of the DD section of (1). FIG. It is a figure which shows the connection state of the nozzle 18 and the pipe 19, (1) shows a normal state, (2) shows the state which rotated the nozzle 18 90 degree | times from the state of (1), (3) is The state where the nozzle 18 is remounted so as to be rotated 90 degrees in the opposite direction from the state of (1) is shown. (1) is the perspective view seen from the front-end | tip (front-end) direction of the nozzle 18 which concerns on embodiment of this invention, (2) is a figure for demonstrating the jet wind from the nozzle opening 31. FIG. (1) is a perspective view seen from the tip (front end) direction of the nozzle 118 in the conventional example, and (2) is a diagram for explaining the jet wind from the nozzle opening 131. It is a figure for demonstrating another embodiment of the nozzle shape of the blower apparatus 1 of this invention. It is a perspective view which shows the switch mechanism in the conventional blower apparatus 101. FIG. FIG. 2 is a perspective view showing a switch mechanism in a conventional blower device 101, where (1) shows a state with a switch cover 150 attached and (2) shows a state with the switch cover 150 removed. It is sectional drawing of the switch mechanism in the conventional blower apparatus 101. FIG. It is sectional drawing which shows the state of switch ON of the switch mechanism in the conventional blower apparatus 101. FIG. 3 is a perspective view showing a switch cover 50 that constitutes a switch unit 48. FIG. It is sectional drawing which shows the cross section of the BB part of FIG. In the switch unit 48, (1) is a view showing a state where the dust-proof cover 4 is opened, and (2) is a view showing a state where the dust-proof cover 4 is closed. (1) is a figure which shows the state which attaches the vacuum pipe 55 to the suction opening 13, (2) is a figure which shows the attached state. (1) is a perspective view showing the shape of the fan 111 according to the prior art, and (2) is a view showing a cross-sectional structure showing a mounting structure of the fan 111. It is a perspective view which shows the shape of the fan 11 by embodiment of this invention. It is sectional drawing which shows the attachment structure of the fan 11 by embodiment of this invention. It is a side view of the attachment part of the fan 11 by embodiment of this invention. . It is the figure which shows the state which looked at the flywheel 61 from the EE cross section of FIG. 27, and the EE cross section. It is a figure which shows the state which looked at the fan 11 from the FF cross section of FIG. 27, and the FF cross section. It is a figure for demonstrating the ribs 81-84 of embodiment of this invention, (2) is the front view which looked at the AA part of FIG. 6, (1) is GG of (2). Sectional drawing and (3) are HH sectional views of (2). It is a figure for demonstrating the ribs 81-84 of embodiment of this invention, (2) is the front view which looked at the AA part of FIG. 6, (1) is II of (2). Sectional drawing and (3) are JJ sectional views of (2). It is a figure for demonstrating the blower apparatus by the prior art, and its usage. It is a figure for demonstrating the usage which uses the blower apparatus by a prior art as a suction device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blower apparatus 2 Main housing 3 Fan housing 3a, 3b Rib 3c Opening 3d Exhaust pipe part 3e Attachment shaft side wall 4 Dust-proof cover 4a, 4b (Dust-proof cover) slit 4c Screw hole 4d Projection part 4e Attachment-shaft penetration part 5 Slit 6a, 6b, 6c Leg part 7 Handle part 8 Throttle trigger 9 Throttle adjustment lever 10 Mounting shaft 11 Fan 11a (Fan) rear surface 13 Suction port 13a Projection part 14 Projection part 15a, 15b, 15c, 15d, 15e Screw 16 Connection part 16a Stopper 17 Discharge pipe 18 Nozzle 18a (Nozzle) connection portion 18b (Nozzle) bent portion 18c (Nozzle) deflection portion 19 Pipe 19a, c (Pipe) connection portion 19b (Pipe) main body portion 20 Projection portion 21 T type Mounting groove 22 L-shaped mounting groove 23a Long rib 23b Short rib 23c Placement mark 24 Step portion 25 Groove inlet 26 Circumferential groove 27 Axial groove 28 Step portion 29a, 29b Holding position 30 Bottom raised portion 31 Nozzle opening 31a, 31b, 31c Straight portion 32 Raised portion 33 Fold 34 Connection portion 35, 36 , 37, 38 Nozzle opening 39 Spring 48 Switch unit 50 Switch cover
50a Contact portion 50b Bending portion 50c Main body portion 50d Arm portion 50e Stopper portion 51 Switch 51a Plunger 52 Screw 53a, 53b, 53c, 53d, 53e Rib 54a, 54b Rib 55 Vacuum pipe 55a (Vacuum pipe) protrusion 61 Flywheel 62 Magnet 64 (flywheel) projecting portion 65 (fan) cylindrical portion 66, 67 (fan) rib 68 recess 69 fin 70 flat portion 75 washer 71 bolt 72 mounting member 73 crankshaft 74 fins 81, 82, 83, 84 Rib 100 Blow target 101 Blower device 103 Fan housing 107 Handle portion 110 Mounting position 118 Nozzle 119 Pipe 144 Screw 150 Switch cover

Claims (9)

In a blower device having a drive device, a fan rotated by the drive device, and a discharge pipe including a plurality of detachable cylindrical members for guiding air generated by the fan in a desired direction,
A protruding portion is formed on the outer peripheral side of the connecting portion of one of the cylindrical members to be attached and detached, and an attachment groove that is fitted to the protruding portion is formed on the outer peripheral side of the other cylindrical member,
The mounting groove is composed of an axial groove formed in the axial direction from the opening of the connecting portion, and two circumferential grooves extending from the tip end side of the axial groove to both sides in the circumferential direction. The shape when viewed from the side is substantially T-shaped,
One cylindrical member is pushed axially with respect to the other cylindrical member and rotated clockwise or counterclockwise so that the protruding portion is positioned in one of the circumferential grooves. Blower device characterized by.   2. The total length of a plurality of circumferential grooves that branch off from the tip side of the axial groove is a length corresponding to about 90 degrees in the circumferential direction as a rotation angle. Blower device.   The blower device according to claim 2, wherein each of the circumferential grooves extending from the tip end side of the axial groove has a length corresponding to a rotation angle of about 45 degrees in the circumferential direction.   The blower device according to claim 2, wherein the cylindrical member is a nozzle that deflects a sending direction of an air flow, and the nozzle is provided with a connection portion in which the attachment groove is formed.   The cylindrical member is a cylindrical pipe, and a connection portion provided with a plurality of protrusions is formed on one end side of the pipe, and a connection portion provided with the mounting groove is formed on the other end side. The blower device according to claim 2.   In the opening of the connecting portion, a groove inlet that protrudes circumferentially outward from the opening and is an end of the axial groove is formed, and the groove inlet is separated by 180 degrees in the circumferential direction in the opening. The blower device according to claim 4 or 5, wherein the blower device is provided at a location.   7. The blower according to claim 6, wherein a plurality of the protrusions are provided in a connection portion on the downstream side of the air flow of the cylindrical member, and the attachment groove is formed in the connection portion on the upstream side. apparatus.   The step part which changed the depth of the groove | channel or the width | variety of the groove | channel was formed in the circumferential groove | channel extended and branched to the circumferential direction both sides from the front end side of the said axial direction groove | channel. Blower device.   The blower device according to claim 1, wherein a mark indicating a circumferential position of the protruding portion is provided on the cylindrical member.

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