JP2016137539A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress while using a tool by improving user's gripping feeling when the user holds a grip part by hand to improve comfortableness when using a power tool.SOLUTION: The left side surface 51 and the right side surface 52 of a grip housing 40 are formed into curved shapes bulged in a horizontal direction. The left side surface 51 and the right side surface 52 are formed into the curved surfaces set to curvature radiuses larger than those of a front side surface and a rear side surface 54. On the left side surface 51 and the right side surface 52, expansion vertices 55 and 56 expanded most in the curvature radiuses are set. The right surface vertex 56 of the right side surface 52 is set to abut on the palm of a first inter-bone range between the metacarpus of a middle finger (third finger) and the metacarpus of a ring finger (fourth finger) of the palm of a hand H gripping a cylindrical outer peripheral surface 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power tool having a grip portion gripped by a hand.

  For example, in a power tool such as an impact driver, a rechargeable battery that is detachable as a power source is used for easy use. Such a power tool roughly has a drive part and a grip part. The drive unit is configured to incorporate a motor that rotationally drives the output shaft. The grip portion is a portion that is gripped by a user's hand, and is disposed on the lower side relative to the drive portion. In this grip portion, a grip housing is formed so as to extend in a direction substantially orthogonal to the direction in which the output shaft extends (see, for example, Patent Document 1).

JP 2014-240114 A

  In the power tool described above, the user uses the grip portion while holding it with his / her hand. For this reason, in order to improve the user's comfort in use, it is desirable to improve the feel of the grip portion gripped by the hand.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is to use a power tool having a grip portion gripped by a hand when the grip portion is gripped by a hand. This is to improve the grip feeling of the person, improve the comfort when using the power tool, and reduce the stress in using the tool.

  In solving the above-described problems, the power tool according to the present invention takes the following means. That is, a power tool according to a first aspect of the present invention includes a motor, an output shaft that is rotated by the motor, and a grip housing that extends in a direction intersecting the direction in which the output shaft extends. The grip housing has a cylindrical outer peripheral surface gripped by a user's hand, and the cylindrical outer peripheral surface has a curved surface shape corresponding to the hand when gripped by the user, and the curved surface shape is And a first curved surface shape formed toward a bulging direction in a direction intersecting with both the direction in which the output shaft extends and the direction in which the grip housing extends. The bulge apex that is most inflated is set so as to be in contact with the palm in the interosseous range between the metacarpal bones of the third and fourth fingers of the hand gripping the cylindrical outer peripheral surface. It is. Incidentally, the third finger is a finger generally called a middle finger, and the fourth finger is a finger generally called a ring finger.

  According to the power tool according to the first aspect of the present invention, the most swollen bulge vertex comes into contact with the palm in the interosseous range between the metacarpal bones of the third and fourth fingers. As a result, the bulge apex that is most inflated is arranged between the metacarpal bone of the third finger and the metacarpal bone of the fourth finger, which is a comfortable part of the palm of the hand gripping the cylindrical outer peripheral surface. It will be. In other words, the pressure received from the curved shape of the cylindrical outer peripheral surface of the hand to be gripped is distributed so as not to concentrate on the metacarpal bone, and the user's hand grip feeling when gripping the cylindrical outer peripheral surface is better Can be a thing. That is, it is possible to improve the comfort when using the power tool and reduce the stress in using the tool.

  The power tool according to a second aspect of the present invention is the power tool according to the first aspect, wherein the interosseous range excludes the range between the ends of the metacarpal bone. It is the structure that it is set in the range between each other's center part. Note that the central portion of the metacarpal bone is relatively thin with respect to the end portion of the metacarpal bone, as in a general bone. In other words, the interosseous range between the metacarpal bones of the third and fourth fingers is the range between the middle parts of the metacarpal bones compared to the range between the end parts of the metacarpal bones. Is wider.

  According to the power tool according to the second invention, the interosseous range between the metacarpal bones of the third finger and the fourth finger is set in a range between the center portions of the metacarpal bone that becomes the widest. Is done. As a result, the bulge apex that is most bulged can be applied to the palm having the widest bone-to-bone range. That is, the distance between the bulging apex and the metacarpal bone (the third finger and the fourth finger) can be earned more. Therefore, it is possible to preferably reduce the contact of the bulge apex with respect to the metacarpal bones (the third finger and the fourth finger), and to further distribute the pressure received from the curved shape of the cylindrical outer peripheral surface to the user's hand to be gripped. Thus, the grip feeling of the user can be further improved, and the stress in using the tool can be further reduced.

  The power tool according to a third aspect of the present invention is the power tool according to the first or second aspect, wherein the curved surface has a direction in which the output shaft extends and a direction in which the grip housing extends. A second curved surface shape that is shaped toward a dent direction that intersects both directions, and the second curved surface shape is set so as to come into contact with a range of the little finger ball of the palm that grips the cylindrical outer peripheral surface. It is the composition of being done. As for the little ball, due to the nature of the hand, it has a bulging shape that protrudes in the palm.

  According to the power tool according to the third aspect of the invention, the second curved surface shape formed toward the dent direction is in contact with the pinky ball range of the palm gripping the cylindrical outer peripheral surface. Can reduce the pressure on. As a result, the pressure received from the curved shape of the cylindrical outer peripheral surface to the gripped user's hand becomes more dispersed, further improving the grip feeling of the user and reducing the stress on using the tool. Can be further planned.

It is a side view which shows the left side view of the impact driver of the state grasped with the hand. It is a rear view which shows the rear view of the impact driver of the state grasped with the hand. FIG. 3 is a rear perspective view showing a rear perspective view of the impact driver of FIGS. 1 and 2. It is a side view which shows the left side view of the impact driver of FIG. FIG. 4 is a rear view showing a rear view of the impact driver of FIG. 3. It is sectional drawing which shows the (VI)-(VI) section arrow of FIG. It is sectional drawing which shows the (VII)-(VII) cross-section arrow of FIG. It is sectional drawing which shows the (VIII)-(VIII) section arrow of FIG. It is sectional drawing which shows the (IX)-(IX) section arrow of FIG. It is a skeleton schematic diagram of the hand schematically showing the skeleton of the hand from the palm side. It is a hand external appearance schematic diagram which shows typically the appearance of a hand from the palm side.

  Hereinafter, an embodiment for carrying out a power tool according to the present invention will be described. The impact driver 10 shown in FIGS. 1 and 2 is a power tool that is widely used than before, and corresponds to a power tool according to the present invention. 1 and 2 show a state in which the impact driver 10 is grasped by hand. The side view of FIG. 1 shows a left side view of the impact driver 10 held by the hand H, and the rear view of FIG. 2 shows a rear view of the impact driver 10 held by the hand H. In the rear perspective view of FIG. 3, a rear perspective view of the impact driver 10 of FIGS. 1 and 2 is shown. 4 shows a left side view of the impact driver 10 of FIG. The rear view of FIG. 5 shows a rear view of the impact driver 10 of FIG. In addition, illustration code | symbol H1 is a thumb which is a 1st finger, and illustration code | symbol H2 is an index finger which is a 2nd finger. Also, the indicated symbol H3 is a middle finger that is the third finger, and the indicated symbol H4 is a ring finger that is the fourth finger. The illustrated symbol H5 is a pinky that is the fifth finger, and the illustrated symbol H6 is a palm.

  The impact driver 10 shown in FIGS. 1 and 2 is driven and operated by pulling the operation trigger 25 while the grip portion 21 is gripped as if the user's hand H is holding the pistol. Incidentally, the hand H holding the grip portion 21 shown in FIGS. 1 and 2 is the right hand of the user. Moreover, in the following description of the impact driver 10, it is based on the front-back, up-down, left-right directions shown in the figure prescribed | regulated in view of the normal usage condition of this impact driver 10. FIG. Specifically, the direction in which the material to be processed (work material) is arranged is defined as the front side (tool front side) of the impact driver 10, and the opposite side is defined as the rear side (tool rear side) of the impact driver 10. The Further, the mounting side of the rechargeable battery 30 is defined as the lower side of the impact driver 10 (the lower side of the tool), and the opposite side is defined as the upper side of the impact driver 10 (the upper side of the tool).

  The impact driver 10 generally includes a tool body 11 and a rechargeable battery 30. The rechargeable battery 30 functions as a power source for the impact driver 10. The rechargeable battery 30 is attached and detached by sliding it on the battery mounting portion 28 of the tool body 11. That is, the rechargeable battery 30 is removed from the tool body 11 and charged by a dedicated charger when the amount of charge decreases. The fully charged rechargeable battery 30 is mounted on the tool body 11. Examples of the rechargeable battery 30 include “BL1430” products in the Makita General Catalog issued in April 2012. The tool body 11 generally includes a drive unit 12 and a grip unit 21. The drive unit 12 has a motor housing 13 that forms an exterior, although a detailed description is omitted. The motor housing 13 is formed as a split molded product divided into left and right parts. The motor housing 13 is formed integrally with a housing body 41 of a grip housing 40 described later.

  An electric motor 14 and a drive mechanism 16 that appropriately converts the rotational drive of the electric motor 14 are installed in the motor housing 13. The electric motor 14 corresponds to the motor according to the present invention, and is configured by a brushless motor. The electric motor 14 rotates and drives a motor shaft (not shown) with electric power supplied from the rechargeable battery 30. An input gear is attached to the motor shaft, and the generated rotational driving force is transmitted to the drive mechanism 16. The drive mechanism 16 includes a speed reduction mechanism that decelerates the rotational drive from the electric motor 14 and an impact mechanism that converts the rotational drive from the electric motor 14 into an impact drive. That is, the output shaft 17 is decelerated by the drive mechanism 16 and is driven to rotate by being subjected to impact driving. The output shaft 17 is provided with a chuck mechanism 18 for gripping a tip tool (not shown). A rotation axis X of the output shaft 17 extends in the front-rear direction shown in the drawing, and is a rotation axis that spirally rotates a target to be rotated. The rotation axis X is the same axis as the rotation axis of the motor shaft (not shown) of the electric motor 14.

  A grip portion 21 is integrally provided below the drive portion 12 described above. The grip part 21 has a grip housing 40. 6 to 9 are cross-sectional views of the grip housing 40 in FIG. 4, and the schematic views of FIGS. 10 and 11 show the skeleton and appearance of the hand H that grips the grip housing 40 (see “Netter Anatomy Atlas”). “The first edition was issued on September 10, 2004 (issuer: Toshihiko Kodate) etc.). Specifically, the cross-sectional view of FIG. 6 shows the (VI)-(VI) cross-sectional view of FIG. 4, and the cross-sectional view of FIG. 7 shows the (VII)-(VII) cross-sectional view of FIG. ing. Further, the cross-sectional view of FIG. 8 shows the (VIII)-(VIII) cross-sectional arrow of FIG. 4, and the cross-sectional view of FIG. 9 shows the (IX)-(IX) cross-sectional arrow of FIG. 10 schematically illustrates the skeleton of the hand H from the palm H6 side, and the schematic diagram of FIG. 11 schematically illustrates the appearance of the hand H from the palm H6 side. An input device 23 (not shown) is provided inside the grip housing 40.

  The input device 23 transmits a control signal for supplying power to the control board by an operation input from the operation trigger 25. The operation trigger 25 is set so that it can be pulled by pulling a pistol trigger with the index finger (second finger) H2 of the hand H in a state where the grip portion 21 is gripped by the hand H. The input device 23 is operated and input in response to the pulling operation of the operation trigger 25. The rotation changeover switch 26 is disposed above and behind the operation trigger 25. The rotation changeover switch 26 slides from the motor housing 13 in the left-right direction, and transmits a control signal for supplying power to the control board at each position on the left and right.

  The grip housing 40 is formed integrally with the motor housing 13 so as to imitate a pistol grip so that the operation in the state of being gripped with the hand H is easy. For this reason, the direction in which the grip housing 40 extends extends in a direction that intersects the direction in which the output shaft 17 extends. The grip housing 40 is formed to extend in the illustrated vertical direction, which is a direction substantially orthogonal to the direction in which the output shaft 17 extends. The grip housing 40 is formed to have a substantially cylindrical shape that is gripped by a user's hand H. The grip housing 40 is formed by integrally molding the housing main body 41 and the exterior elastomer 45. A battery mounting portion 28 that allows the rechargeable battery 30 to be attached and detached is provided at the lower portion of the grip housing 40. In addition, an electric wire for supplying electric power from the rechargeable battery 30 attached to the battery attachment portion 28 to the electric motor 14 is wired inside the housing main body 41.

  As shown in FIGS. 6 to 9, the grip housing 40 has a substantially elliptical cross section. The cylindrical outer peripheral surface 50 is set as an outer peripheral surface of the grip housing 40 having a substantially cylindrical shape. The cylindrical outer peripheral surface 50 is formed to have a curved surface shape corresponding to the hand H when gripped by the user. As with the motor housing 13, the grip housing 40 is formed as a split molded product divided into left and right parts. That is, the grip housing 40 is formed by combining the left housing 43 and the right housing 44 which are divided into right and left parts. The left housing 43 and the right housing 44 are formed by integrally molding an exterior elastomer 45 that is substantially symmetrical to the left and right with respect to a housing body 41 that is substantially symmetrical to the left and right. The exterior elastomer 45 has an anti-slip effect when gripping the grip portion 21 with the hand H and an effect of enhancing the appearance design of the grip portion 21. The left-right direction is a direction that intersects both the front-rear direction in which the output shaft 17 extends and the up-down direction in which the grip housing 40 extends.

  The left side surface 51 and the right side surface 52 of the grip housing 40 are formed in a curved shape that is expanded in the left-right direction. The left side surface 51 and the right side surface 52 are formed in a curved surface shape set to have a larger curvature radius than the front side surface 53 and the rear side surface 54. In other words, the front side surface 53 and the rear side surface 54 of the grip housing 40 are formed in a curved surface shape that has a smaller radius of curvature than the left side surface 51 and the right side surface 52. Further, the front side surface 53 is formed in a curved surface shape set to have a smaller radius of curvature than the rear side surface 54. The front side surface 53 is a surface that connects both side surfaces of the left side surface 51 and the right side surface 52 on the front side. The rear side surface 54 is a surface that connects both side surfaces of the left side surface 51 and the right side surface 52 on the rear surface side.

  Here, the left side surface 51 and the right side surface 52 correspond to the first curved surface shape according to the present invention. The curved shapes of the left side surface 51 and the right side surface 52 are formed so as to bulge toward the bulging direction in the left-right direction. Here, a pressing recess 47 is provided on the upper rear surface of the grip housing 40. The pressing recess 47 is formed in a shape that is sandwiched by a sandwiching portion Hd between the thumb (first finger) H1 and the index finger (second finger) H2. The pressing recess 47 is formed to be recessed toward the foremost side of the rear side surface 54 of the grip housing 40.

  By the way, on the left side surface 51 and the right side surface 52, bulge vertices 55 and 56 that are most bulged among the curved surface shapes described above are set. Speaking individually, the left side surface 51 is provided with a bulging left side surface vertex 55 bulged to the leftmost side among the curved surface shape bulging to the left side. Further, the right side surface 52 is provided with a bulging right side surface vertex 56 which is bulged to the rightmost side among curved surface shapes bulging to the right side. These vertices 55 and 56 are set at positions that are symmetrical to each other. The right side vertex 56 of the right side 52 is set so as to contact the palm H6 of the right hand H that grips the cylindrical outer peripheral surface 50. When the hand gripping the cylindrical outer peripheral surface 50 is the left hand, the left side vertex 55 of the left side 51 comes into contact with the palm of the left hand.

  Here, the right side surface vertex 56 of the right side surface 52 is the middle finger (third finger) H3 shown in FIG. 10 among the palm H6 of the hand H holding the cylindrical outer peripheral surface 50, and the ring finger (fourth finger). ) It corresponds to the palm H6 of the first interosseous range S1 between the metacarpal bone H8 of H4. Furthermore, the right side vertex 56 of the right side surface 52 corresponds to the palm H6 of the second interosseous range S2 that is limited by the range located in the approximate center in the above-described first interosseous range S1. . This second interosseous range S2 is between the metacarpal bones H7 and H8 of the middle finger (third finger) H3 and the metacarpal bone H8 of the ring finger (fourth finger) H4. It is set by the range between the central portions H7c and H8c of the metacarpal bones H7 and H8, excluding the range between the portions H7a and H8a (H7b and H8b).

  It should be noted that even at the left side surface vertex 55 of the left side surface 51, it is set at the position of the left side surface 51 that is symmetrical to the right side surface vertex 56 of the right side surface 52. Here, in the first interosseous range S1 between the metacarpal bone H7 of the middle finger (third finger) H3 and the metacarpal bone H8 of the ring finger (fourth finger) H4, these metacarpal bones H7 and H8 are mutually connected. Compared to the range between the ends H7a, H8a (H7b, H8b), the second interosseous range S2 between the middle portions H7c, H8c of the metacarpal bones H7, H8 is more metacarpal bone H7. , H8 is wide. Incidentally, the right side surface vertex 56 of the right side surface 52 before the present invention was made hits the metacarpal bone H7 of the middle finger (third finger) H3.

  Also, a little ball contact portion 60 is set at the lower portion of the cylindrical outer peripheral surface 50 described above. The little finger ball contact portion 60 is set so as to touch the little finger ball range H9 of the palm H6 gripping the cylindrical outer peripheral surface 50. The little ball contact portion 60 is formed across the left side 51, the rear side 54, and the right side 52 in the lower part of the cylindrical outer peripheral surface 50. Specifically, the little ball contact portion 60 is set over a range of a substantially half circumference on the rear side of the entire lower circumference of the cylindrical outer peripheral surface 50. That is, the little ball contact portion 60 is set at the left contact portion 61 set at the lower portion of the left side surface 51, the right contact portion 62 set at the lower portion of the right side surface 52, and the lower portion of the rear side surface 54. And a rear contact portion 63. The rear contact portion 63 is set so as to connect the left contact portion 61 and the right contact portion 62.

  The left contact portion 61 and the right contact portion 62 are formed in the left and right concave directions so that the amount of swelling is suppressed among the curved shapes of the left side surface 51 and the right side surface 52 that swell left and right. The The left contact portion 61 and the right contact portion 62 correspond to the second curved surface shape according to the present invention. Further, even in the rear contact portion 63, when the left contact portion 61 and the right contact portion 62 are connected, the rear contact portion 63 is shaped toward the forward recess direction so that the amount of swelling is suppressed. The right contact portion 62 and the rear contact portion 63 set in this way are set so as to touch the pinky ball range H9 of the palm H6 of the right hand H that grips the cylindrical outer peripheral surface 50.

  In addition, about the dimension of the front-back width and the left-right width of the grip housing 40, the relative relationship as shown in the following [Table 1] is materialized. According to [Table 1], the front-rear width is set to “U4 <U1 <U2 <U3”. The left and right width is set to “V4 <V3 <V2.”

  According to the impact driver 10 described above, the following operational effects can be achieved. That is, according to the impact driver 10 described above, the bulging right side surface vertex 56 that is most inflated is the first interosseous range S1 between the metacarpal bone H7 of the third finger H3 and the metacarpal bone H8 of the fourth finger H4. Will be in contact with the palm H6. As a result, the bulging right side surface vertex 56 that is most inflated is located in the metacarpal bone H7 and the fourth finger H4 of the third finger H3, which is a comfortable place, among the palms H6 of the hand H holding the cylindrical outer peripheral surface 50. It will be placed between the hand bone H8. That is, the pressure received from the curved shape of the cylindrical outer peripheral surface 50 of the hand to be gripped is dispersed so as not to concentrate on the metacarpal bones H7 and H8. The grip feeling can be improved. That is, it is possible to improve the comfort when using the impact driver 10 and reduce the stress in using the tool.

  Further, according to the impact driver 10 described above, the first interosseous range S1 between the metacarpal bone H7 of the middle finger (third finger) H3 and the metacarpal bone H8 of the ring finger (fourth finger) H4 is It is set in the second inter-osseous range S2 between the center portions H7c and H8c of the metacarpal bones H7 and H8 that are widened. Accordingly, the bulging right side surface vertex 56 that is most bulged can be applied to the palm H6 of the second interosseous range S2 where the first interosseous range S1 is the largest. That is, the distance between the bulging right side surface vertex 56 and the metacarpal bones H7 and H8 can be further earned. Therefore, it is possible to further reduce the contact with the metacarpal bones H7, H8 of the bulging right side surface vertex 56, and to further distribute the pressure received from the curved shape of the cylindrical outer peripheral surface to the user's hand to be gripped, It is possible to further improve the grip feeling of the user and further reduce the stress in using the tool.

  The central portions H7c and H8c of the metacarpal bones H7 and H8 are relatively thin with respect to the end portions H7a and H8a (H7b and H8b) of the metacarpal bones H7 and H8 in the same manner as general bones. . That is, the first interosseous range S1 between the metacarpal bones H7, H8 between the middle finger (third finger) H3 and the ring finger (fourth finger) H4 is the end portions H7a, H8a of the metacarpal bones H7, H8. The second inter-osseous range S2 between the central portions H7c and H8c of the metacarpal bones H7 and H8 is wider than the inter-osseous range between (H7b, H8b).

  Further, according to the impact driver 10 described above, the right contact portion 62 formed in the direction of the depression comes into contact with the little finger ball range H9 of the palm H6 that grips the cylindrical outer peripheral surface 50, so that the little finger having a swollen shape The pressure on the sphere range H9 can be reduced. Thereby, the pressure received from the curved surface shape of the cylindrical outer peripheral surface 50 to the user's hand H to be gripped is more dispersed, and the grip feeling of the user is further improved, and the tool is used. Stress can be further reduced. As for the little ball, due to the nature of the hand, it has a bulging shape so as to protrude in the palm H6.

  In addition, in the power tool which concerns on this invention, it is not limited to the structure of the impact driver 10 of above-described embodiment, It can comprise with the appropriate electric tool which has the pistol-shaped grip part 21. FIG. it can. Further, regarding the shape of the exterior elastomer 45 or the like, an appropriate shape can be selected.

10 Impact drivers (power tools, power tools)
DESCRIPTION OF SYMBOLS 11 Tool main body 12 Drive part 13 Motor housing 14 Electric motor 16 Drive mechanism 17 Output shaft 18 Chuck mechanism 21 Grip part 23 Input device 25 Operation trigger 26 Rotation switch 28 Battery mounting part 30 Rechargeable battery 40 Grip housing 41 Housing main body 43 Left side Housing 44 Right housing 45 Exterior elastomer 47 Pressing recessed portion 50 Cylindrical outer peripheral surface 51 Left side surface 52 Right side surface 53 Front side surface 54 Rear side surface 55 Left side surface vertex 56 Right side vertex 60 Little finger ball contact region 61 Left contact region 62 Right contact Contact part 63 Rear contact part H User's (right) hand H1 First finger (thumb)
H2 Second finger (forefinger)
H3 Third finger (middle finger)
H4 4th finger (ring finger)
H5 fifth finger (little finger)
H6 palm H7 third finger (middle finger) metacarpal bone H8 fourth finger (ring finger) metacarpal bone H7a, H7b, H8a, H8b end H7c, H8c center H9 little finger ball range Hd pinching part S1 first bone Interrange S2 Second interosseous range X Rotation axis

Claims (3)

A motor,
An output shaft rotated by the motor;
A grip housing extending in a direction intersecting with a direction in which the output shaft extends,
The grip housing has a cylindrical outer peripheral surface gripped by a user's hand,
The cylindrical outer peripheral surface has a curved shape corresponding to a hand when gripped by a user,
The curved surface shape has a first curved surface shape that is shaped toward a bulging direction that intersects both the direction in which the output shaft extends and the direction in which the grip housing extends,
The bulge apex that is most bulged among the first curved surface shapes comes into contact with the palm in the interosseous range between the third and fourth fingers of the hand gripping the cylindrical outer peripheral surface. Set to a power tool. The power tool according to claim 1,
The inter-bone range is a power tool set in a range between the central portions of the metacarpal bone excluding a range between the end portions of the metacarpal bone. The power tool according to claim 1 or 2,
The curved surface shape has a second curved surface shape that is shaped toward a recess direction that intersects both the direction in which the output shaft extends and the direction in which the grip housing extends,
The power tool, wherein the second curved surface shape is set so as to come into contact with a pinky ball range of a palm gripping the cylindrical outer peripheral surface.

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