JP2007075917A - Electric working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent sweating of a hand holding a grip part of an electric working machine. <P>SOLUTION: In this electric working machine provided with the hollow grip part 9a held by a worker, a ventilation passage 11 passing through as if crossing the grip part 9a is provided. In the ventilation passage 11, a partition wall 13 for partitioning the ventilation passage 11 and a cavity in the grip part 9a is provided. Air ventilating property of the inside of the hand holding the grip part 9a becomes better by the existence of the ventilation passage 11 to suppress hand sweating. As a result, interruption of a work can be reduced, and at the same time, safety of the work can be enhanced by preventing slip due to the hand sweating. Since the space between the ventilation passage and the cavity in the grip part 9a is interrupted by the partition wall 13, entering of rain water, etc. into the grip part 9a is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric working machine such as a hedge trimmer, a sander, and a grinder.

  As shown in FIG. 8 and FIG. 9, a grip trimmer 2 held by a worker 1 is provided on a hedge trimmer or the like. In addition, there are grinders and the like in which a grip portion also serves as a housing of an electric motor. The grip portion is formed with a groove and an intake port for taking cooling air for cooling the electric motor into the housing (for example, Patent Documents). 1).

JP-A-6-143158

  However, according to the grip portion 2 shown in FIGS. 8 and 9, since the palm is in close contact with the grip portion 2 during the work, sweat is easily generated on the palm, but the evaporation of sweat does not remain, and the worker is uncomfortable. It is necessary to continue the work as it is or to interrupt the work frequently for safety and wipe off the sweat. For this reason, there exists a problem that work efficiency, such as lawn mowing work by an electric working machine, falls. This tendency is particularly strong when working for a long time in high temperature and high humidity.

  In addition, when a cooling air intake groove or air inlet is formed in the grip part, sweat generated on the palm of the hand gripping the grip part may easily evaporate through the groove or air inlet. And the like are liable to enter the housing from the air inlet, and electrical components such as the switch device in the housing are liable to be damaged due to adhesion of rainwater or the like.

  Therefore, an object of the present invention is to provide means that can solve the above-mentioned problems.

  In order to solve the above problems, the present invention employs the following configuration.

  That is, according to the first aspect of the present invention, in the electric working machine having a hollow grip portion gripped by an operator, an air passage (11) penetrating the grip portion (9a) is provided. 11) A partition wall (13) is provided in the grip portion (9a) for partitioning from the cavity in the grip portion (9a).

  The invention according to claim 2 is the electric work machine according to claim 1, wherein both ends of the air passage (11) are covered with the end walls (18), and a plurality of air holes (18) are formed in the both end walls (18). 18a) is formed.

  The invention according to claim 3 is the electric working machine according to claim 1 or 2, wherein the hollow grip portion (9a) is a flat surface that divides the air passage (11) and the partition wall (13). It is divided, and labyrinth engaging portions (17a, 17b) are formed on the abutting surfaces of the divided portions.

  According to a fourth aspect of the present invention, in the electric working machine according to any one of the first to third aspects, an outside air introduction port (19) formed in the partition wall (13) is formed, and this outside air introduction is performed. A ventilation path (20) extending from the mouth (19) toward the electric motor (3) is provided in the grip portion (9a).

  According to the first aspect of the present invention, in the electric working machine having the hollow grip portion gripped by the worker, the air passage (11) penetrating as if crossing the grip portion (9a) is provided. 11) Since a partition wall (13) is provided in the grip portion (9a) for partitioning with the cavity in the grip portion (9a), the hand (1) holding the grip portion (9a) due to the presence of the air passage (11) ) Improves the air permeability inside and prevents hand sweat. Therefore, interruption of work can be reduced, and at the same time, slippage due to hand sweat can be prevented and work safety can be improved. Moreover, since the space between the air passage (11) and the cavity in the grip portion (9a) is blocked by the partition wall (13), the permeation of sweat, rainwater, etc. into the grip portion (9a) is prevented. . Therefore, damage to the electric motor (3), the electrical components (15, 16), etc. provided in the grip (9a) or the housing (5) leading to the cavity of the grip (9a) is prevented. Further, the heat transfer from the electric motor (3) in the housing (5) may be blocked by the partition wall (13) so that the heat is not transferred from the inside of the air passage (11) to the outside of the grip portion (9a). it can.

  According to the invention according to claim 2, in the electric working machine according to claim 1, both ends of the ventilation path (11) are covered with the end walls (18), and a plurality of ventilation holes (18) are formed in the both end walls (18). Since 18a) is formed, the air passage (11) is hidden by the end wall (18), and the appearance of the grip portion (9a) can be improved. In addition, the air permeability can be adjusted as appropriate by adjusting the number and size of the air holes (18a).

  According to a third aspect of the present invention, in the electric working machine according to the first or second aspect, the hollow grip portion (9a) is a flat surface that divides the air passage (11) and the partition wall (13). Since the labyrinth engaging portions (17a, 17b) are formed on the abutting surfaces of the divided portions, the grip portion and the partition wall can be easily assembled by simply overlapping the divided portions, and the labyrinth engagement By engaging the parts, permeation of sweat, rainwater and the like into the grip part and leakage of hot air from the grip part and the like can be appropriately prevented.

  According to a fourth aspect of the present invention, in the electric working machine according to any one of the first to third aspects, the outside air introduction port (19) is formed in the partition wall (13), and the outside air introduction port (19 ) To the electric motor (3) is provided in the grip portion (9a), so that the outside air passes through the cooling air (a) of the electric motor (3). Since the air flows into the ventilation path (20) from (11), the air smoothly flows in the ventilation path (11), and therefore the sweat of the hand (1) gripping the grip portion (9a) is more efficiently removed. Is done.

  The best mode for carrying out the invention will be described below with reference to the drawings.

<Embodiment 1>
As shown in FIG. 1, this electric working machine is specifically configured as a hedge trimmer.

  The hedge trimmer includes a housing 5 that houses an electric motor 3 and a transmission device 4 (see FIG. 7). A blade 6 protrudes from the lower portion of the housing 5 to the front of the housing 5. The rotation of the electric motor 3 is decelerated by the transmission device 4 and converted into a back and forth reciprocating motion of the blade 6. Since the structure and operation of the transmission are well known, detailed description thereof is omitted. A cooling fan 7 is attached to the electric motor 3, and the cooling fan 7 rotates with the rotation of the electric motor 3.

  As shown in FIG. 1, a cooling air intake port 5 a for taking in cooling air a is provided in the upper part of the housing 5, and cooling air outlets 5 b and 5 c for discharging the cooling air a are provided in the lower part of the housing 5. Provided. When the cooling fan 7 rotates simultaneously with the rotation of the electric motor 3, the cooling air a cools the electric motor 3 while flowing through the housing 5 from the cooling air inlet 5a to the cooling air outlets 5b and 5c.

  As shown in FIG. 1, the housing 5 is provided with an auxiliary grip portion 8 and a grip portion 9. The auxiliary grip 8 is fixed to the lower portion of the housing 5 and protrudes obliquely upward from the front of the housing 5 therefrom. The grip portion 9 includes an upper grip portion 9a and a lower grip portion 9b. The rear ends of the upper and lower grip portions 9a and 9b are coupled to each other, and the front ends are coupled to the housing 5 integrally. A trigger 10 for turning on and off the electric motor 3 is provided at a location where the upper grip portion 9 a is connected to the housing 5. The auxiliary grip portion 8 and the upper and lower grip portions 9a and 9b are appropriately selected and held with one or both hands of the operator during the trimming operation by the hedge trimmer.

  The upper and lower grip portions 9a and 9b are integrally formed with the housing 5 and are divided into two parts together with the housing 5 on a plane extending in parallel with the paper surface of FIG. The two divided parts are abutted at the abutting surface and joined by a set screw (not shown) or the like, so that the housing 5 and the upper and lower grips 9a and 9b are assembled together.

  Moreover, as shown in FIG.2 and FIG.3, the labyrinth engaging part is formed in the butt | matching surface of a division | segmentation part. The labyrinth engaging portion includes a convex portion 10a formed along the contour of the housing 5 and the upper and lower grip portions 9a, 9b on the abutting surface of one divided piece, and the housing 5 and the upper and lower surfaces on the abutting surface of the other divided piece. It is comprised with the recessed part 10b formed so that the outline of grip part 9a, 9b may be followed. By fitting the convex portion 10a into the concave portion 10b, both the divided portions are joined so as not to form a gap at the abutting surface and so as not to cause a step on the surface, and the housing 5 and the upper and lower grip portions 9a and 9b are assembled. .

  As shown in FIGS. 1 to 3, the upper grip portion 9 a is provided with an air passage 11 that penetrates the upper grip portion 9 a so as to cross the hedge trimmer in the left-right direction. The air passage 11 extends long in the length direction of the upper grip portion 9a. The presence of the air passage 11 improves the air permeability inside the hand 1 of the operator who holds the upper grip portion 9a, so that hand sweat is easily removed.

  As shown in FIGS. 1 and 2, the surfaces of the upper grip portion 9 a and the lower grip portion 9 b are covered with a soft film 12 except for the opening of the air passage 11 as necessary. The soft film 12 is formed of a material that is easily fitted to the palm and not slippery, such as urethane rubber.

  As shown in FIGS. 2 and 3, a partition wall 13 is provided in the air passage 11 so as to partition the cavity in the upper grip portion 9 a. The partition wall 13 is provided so as to surround the air passage 11 like a tunnel wall. Thus, since the space between the ventilation path 11 and the cavity in the upper grip portion 9a is blocked by the partition wall 13, permeation of sweat, rainwater, etc. into the cavity of the upper grip portion 9a is prevented. As shown in FIG. 1, a lead wire 14 is inserted into the cavity of the upper grip portion 9a, and as shown in FIG. 7, a switch, which is an electrical component, is located near the trigger 10 in the cavity of the upper grip portion 9a. The device 15 is accommodated, and a DC converter 16 as an electrical component is accommodated at the rearmost portion in the cavity of the upper grip portion 9a, but the insulation distance with respect to the lead wire 14 is secured by the presence of the partition wall 13, Alternatively, damage to electrical components such as the DC converter 16 due to adhesion of rainwater, sweat, or the like is prevented. Further, heat generated by the electric motor 3 in the housing 5 can be prevented from being transmitted from the inside of the air passage 11 to the hand 1 that holds the upper grip portion 9a.

  As shown in FIGS. 2 and 3, the partition wall 13 is divided on the same plane as the plane that divides the housing 5 and the upper and lower grip portions 9a, 9b into the left and right. And the labyrinth engaging part which consists of the convex part 17a and the recessed part 17b is formed in the abutting surface of the partition wall 13 similarly to the labyrinth engaging part of the said housing 5 grade | etc.,. The partition wall 13 is joined on the abutting surface at the same time that the divided portions of the housing 5 and the upper and lower grip portions 9a and 9b are joined at the abutting surface. And the joint of the partition wall 13 is closed by engagement of the uneven parts 17b and 17a. Since the abutment surface of the partition wall 13 is engaged by the labyrinth engaging portion in this way, the sealing performance by the partition wall 13 is further improved, and permeation of sweat, rainwater, etc., and leakage of hot air are more appropriately prevented. .

  Next, the operation of the hedge trimmer having the above configuration will be described.

  For example, the operator holds the upper grip portion 9a with one hand 1 and supports the hedge trimmer by holding the auxiliary grip portion 8 or the lower grip portion 9b with the other hand (not shown).

  When the trigger 10 is pressed with the finger of the hand 1 holding the upper grip portion 9a, the electric motor 3 (see FIG. 7) is activated, and the blade 6 reciprocates back and forth. Trimming work is performed by applying this blade 6 to planting or the like.

  Sweat is generated inside the hand 1 of the operator holding the upper grip portion 9a, but the upper grip portion 9a corresponding to the palm is provided with an air passage 11, and since air passes through the air passage 11, the sweat is generated. Is easy to diverge. For this reason, the operator can continue the trimming operation without frequently wiping the palm, and the workability can be improved.

  In addition, hand slippage due to hand sweat can be prevented, and work safety can be improved.

  Furthermore, sweat and rainwater generated in the hands of the operator are blocked by the partition wall 13. For this reason, damage to electrical components (see FIG. 7) such as the switch device 15 and the DC converter 16 inside the hedge trimmer is prevented. On the contrary, the heat of the electric motor 3 and the like generated in the housing 5 is blocked by the partition wall 13, and the heat transfer from the inside of the air passage 11 to the hand 1 that grips the upper grip portion 9a is blocked.

<Embodiment 2>
As shown in FIGS. 4 to 6, the openings at both ends of the air passage 11 in the upper grip portion 9 a of the hedge trimmer according to the second embodiment are covered with end walls 18, respectively. A plurality of ventilation holes 18 a are formed in the both end walls 18. Thus, the appearance of the upper grip portion 9a can be improved by hiding the air passage 11 with the end wall 18. In addition, the air permeability of the air passage 11 can be adjusted as appropriate by adjusting the number and size of the air holes 18a. The appearance performance of the hedge trimmer can be enhanced by setting the shape of the vent hole 18a to a desired shape such as a petal.

  4 to 6, the same parts as those in Embodiment 1 are denoted by the same reference numerals, and redundant description is omitted.

<Embodiment 3>
As shown in FIG. 7, in the upper grip portion 9a of the hedge trimmer according to the third embodiment, a relatively thin ventilation path 20 extending from the outside air introduction port 19 formed in the partition wall 13 toward the electric motor 3 is provided. Is provided. When the electric motor 3 is activated and the cooling fan 7 rotates and the cooling air a flows around the electric motor 3, the outside air is drawn into the cooling air a from the vent hole 18a of the upper grip portion 9a in the air passage 11. And flows into the ventilation path 20 from the outside air introduction port 19. That is, the air permeability in the air passage 11 is improved by the suction action of the cooling fan 7. Thereby, the sweat of the hand holding the upper grip part 9a is more efficiently removed.

  In FIG. 7, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the various embodiments described above, and various modifications can be made without departing from the scope of the present invention. For example, in the above embodiment, a hedge trimmer has been described as an example, but the present invention can be applied to other electric working machines such as a sander and a grinder in addition to the hedge trimmer. In the above-described embodiment, the air passage, the air passage, and the like are provided in the upper grip portion. However, it is also possible to provide them in the lower grip portion and the auxiliary grip portion. In the above embodiment, only one air passage is provided in one grip portion, but a plurality of air passages may be provided.

It is a side view of the electric working machine which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a III-III direction arrow directional view in FIG. It is a principal part side view of the electrically-driven working machine which concerns on Embodiment 2 of this invention. In FIG. 4, it is a VV arrow directional cross-sectional view. In FIG. 5, it is a VI-VI direction arrow directional view. It is a side view which removes one half and shows the housing of the electrically-driven working machine which concerns on Embodiment 3 of this invention. It is a partial notch side view of the conventional electric working machine. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Electric motor 9a ... Upper grip part 11 ... Ventilation path 13 ... Partition wall 17a ... Convex part 17b ... Concave part 18 ... End wall 18a ... Vent hole 19 ... Outside air introduction port 20 ... Ventilation path

Claims (4)

  In an electric working machine having a hollow grip portion gripped by an operator, an air passage that penetrates the grip portion as it crosses the grip portion is provided, and a partition wall that partitions the cavity in the grip portion is provided in the air passage. Electric working machine characterized by that.   2. The electric working machine according to claim 1, wherein both ends of the air passage are covered with end walls, and a plurality of vent holes are formed in the both end walls.   The electric working machine according to claim 1 or 2, wherein the hollow grip portion is divided into two parts along with the partition wall on a plane that divides the air passage, and a labyrinth engaging portion is formed on the abutting surface of the divided portion. Electric working machine characterized by.   The electric working machine according to any one of claims 1 to 3, wherein an outside air introduction port is formed in the partition wall, and a ventilation path extending from the outside air introduction port toward the electric motor is provided in the grip portion. A feature of the electric working machine.

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