JP7040365B2 - Power tools - Google Patents

Description

The present invention relates to a hand-held power tool, and particularly aims to improve the assemblability of a sub-handle having a metal band.

In the hand-held power tool, a handle portion is provided in a part of the housing so that it can be gripped with one hand. For heavy power tools that are difficult to operate with only one hand, or for large vibrations during operation, provide a detachable sub-handle on the power tool housing and work while holding the sub-handle with the other hand. Is widely practiced. For example, in Patent Document 1, a sub-handle having a metal band is provided on the cylinder case. The sub-handle has a band-shaped band, a shaft member (handle bolt) for fixing both ends of the band, and an arc-shaped mounting surface that abuts on substantially half of the cylinder case, and is a mount that holds the band and the shaft member. And a grip portion that is adjacent to the mount and is screwed to the shaft member. Then, the sub handle is attached to the power tool by tightening the band with the grip portion in a state where the band is wound around the outer peripheral surface of the cylinder case of the power tool.

Japanese Unexamined Patent Publication No. 2016-187854

The sub-handle of the power tool as described in Patent Document 1 is bent so that the diameter of the curved portion before mounting is slightly smaller than the diameter of the outer circumference of the cylinder case cover so that the cylinder case cover can be securely tightened. There is. Therefore, when the band is attached to the cylinder case cover, both ends of the band expand in the direction away from the design dimensions, and the handle engaged with the through hole (band hole) on the tip side of the band when mounting the mount. It becomes easy to come off from the bolt. Therefore, attach the mount so that the handle bolt is inserted into the shaft hole of the mount while holding it by hand so that it does not come off from the handle bolt from the tip side of the band. However, if the handle bolt and the band are disengaged in the axial direction during installation, the band must be separated from the mount and the handle bolt must be realigned with the tip of the band to improve assembly. There was room.

The present invention has been made in view of the above background, and an object of the present invention is to provide a power tool having improved sub-handle assembleability by easily maintaining a state in which a handle bolt is attached to a band hole portion. To provide.
Another object of the present invention is to provide a power tool in which a handle bolt is used to form a handle bolt that enables temporary fixing that suppresses the band from spreading in the circumferential direction, thereby facilitating the mounting process of a mount or a grip. To do.

The following is a description of typical features of the invention disclosed in the present application.
According to one feature of the present invention, it has a drive source, a housing accommodating the drive source, and a sub handle attached to a sub handle mounting portion, and the housing is provided separately from the handle portion and the handle portion. Applies to power tools with a tubular sub-handle mount. The sub handle of the power tool consists of a band that is fixed by tightening the sub handle mounting part, a fixing member that engages with both ends by winding the band around the outer surface of the sub handle mounting part, and a sub handle mounting part. A mounting surface that abuts on the outer peripheral surface of the wheel is formed, and the mounting portion that holds the band and the fixing member is engaged with the fixing member that protrudes radially outward from the mounting portion to mount the fixing member. By moving relative to the band, both ends of the band are pulled to tighten the sub-handle mounting portion, and the fixing member and the band are fixed to each other with a grip portion. The fixing member is provided with a temporary fixing portion for holding the band so as not to move in the radial direction and the circumferential direction of the sub handle mounting portion. Further, the fixing member has a hooking portion for holding the band so as not to move in the radial direction and the circumferential direction of the sub handle mounting portion. In the fixing member, a hooking portion is formed on one end side of a columnar main shaft portion. The hooking portion is formed by a radial extending portion extending in two directions toward the radial outer side of the main shaft portion and a temporary fixing portion extending in the orthogonal direction from the tip portion of the radial extending portion. A right-angled inner corner is formed by the stop and the radial extension.

According to another feature of the present invention, the band is preferably made of a metal having a restoring force, and is bent in a substantially U shape so that the two ends are formed as a mounting surface that is substantially parallel and close to each other. In addition to penetrating the temporary fixing portion and the radial extension portion, a through hole that can be engaged with the radial extension portion in the longitudinal direction of the sub-handle is formed in the. The band is formed so that the distance between the mounting surfaces after the band is wound around the sub-handle mounting portion is larger than the distance between the two temporary fixing portions, so that the temporary fixing portion can temporarily fix the band. To. The grip part and the mount part are composed of separate parts, and the male screw part of the fixing member held inside the mount part and protruding toward the grip part is screwed into the female screw part of the grip part to form the fixing member. The grip part can rotate around the axis, and by rotating the grip part, the fixing member is moved relative to the mount part, and both ends of the band are pulled outward in the radial direction of the sub handle mounting part. Can be tightened.

According to still another feature of the present invention, the hooking portion is formed integrally with the main shaft portion and extends in parallel with the vertical surface extending in the vertical direction from the axis of the fixing member and the temporary fixing portion formed in the temporary fixing portion. The band is temporarily fixed in a state where it has parallel surfaces and the parallel surfaces are in contact with the outer surface of the band. Further, the vertical surface of the temporary fixing portion is formed so as to face the axis side of the fixing member. The internal angle formed by the vertical plane and the parallel plane may be formed at about 90 degrees. The parallel surface of the fixing member is formed on the sub-handle mounting portion side or the anti-sub-handle mounting portion side of the radially extending portion.

According to still another feature of the present invention, in the fixing member, a hooking portion is formed on one end side of a columnar spindle portion, and the hooking portion is mounted so as to be orthogonal to the axis of the spindle portion. The band can be temporarily fixed by forming a groove portion continuous in the circumferential direction on the side surface of the quadrangular prism member which is composed of the quadrangular prism member and extends radially outward from the axis of the fixing member. Further, the portion outside the groove portion of the quadrangular prism member may be twisted about the longitudinal axis of the quadrangular prism member.

According to still another feature of the present invention, the band is formed by bending a semicircular portion, a straight portion extending radially outward from the two ends of the semicircle portion, and the tip of the straight portion. The shape is such that it has three parts of parallel planes, and a through hole is formed in the straight line portion through which the mount portion is penetrated.

According to the present invention, the temporary fixing portion can be formed only by changing a part of the shape without increasing the size of the parts such as extending the upper part of the fixing member to the left and right, so that the number of parts and the assembly man-hours are not increased. In addition, it is possible to maintain the state of being attached to the band hole portion by the fixing member. With this configuration, the metal band in the middle of assembly can be maintained in a temporarily fixed state, so that it is possible to avoid re-working due to the band coming off during assembly, and there is an effect of improving workability at the time of assembly.

It is a left side view of the power tool (hammer drill 1) which concerns on embodiment of this invention. It is a partial side view near the cylinder case cover 2 of FIG. 1, and shows the state which the sub-handle 30 is removed. 1A is a view showing the shape of the sub-handle 30, where FIG. 1A is a sectional perspective view of the mount 50 and the grip 60, FIG. Is a cross-sectional perspective view in a state where the band 31 and the handle bolt 40 are attached to (A). It is a figure which shows the shape of a handle bolt 40 and a band 31, (A) shows the shape of this Example, (B) shows the shape of the handle bolt 140 of a conventional example. (A) is a side view of the handle bolt 40, and (B) is a top view of the handle bolt 40. It is a figure explaining the temporary fixing procedure of a handle bolt 40 and a band 31 which concerns on this Example. It is a partial side view of FIG. 6C. It is a figure which shows the handle bolt 70 which concerns on 2nd Embodiment of this invention, (A) is a side view, (B) is a perspective view. It is a figure which shows the handle bolt 80 which concerns on 3rd Embodiment of this invention, (A) is a side view, (B) is a perspective view. It is a figure which shows the handle bolt 90 which concerns on 4th Embodiment of this invention, (A) is a side view, (B) is a perspective view. 10 is a diagram illustrating a procedure for temporarily fixing the handle bolt 90 and the band 31 of FIG. 10, and FIGS. 10A and 10B are side views. 11 is a side view of a state in which the position of the handle bolt 90 is changed from the state of FIG. 11B to a temporarily fixed state. It is sectional drawing which shows the state after the handle bolt 90 was attached to the mount 50 from the state of FIG. It is a figure explaining the temporary fixing procedure of a handle bolt 140 and a band 31 in a conventional sub-handle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following figure, as an example of the power tool, an example of attaching the sub handle 30 to the hammer drill 1 will be described. Further, the same parts are designated by the same reference numerals, and the description of repetition will be omitted. In the present specification, the front-back, left-right, up-down directions of the power tool, and the axis B1 direction of the sub-handle 30 will be described as the directions shown in the drawing.

The power tool (hammer drill 1) shown in FIG. 1 is a tool for performing work by attaching a tip tool to the tip, and a housing in a broad sense is formed by a main housing 3 and a cylinder case cover 2. A handle portion 3b is formed on the rear side of the main housing 3 at a position separated from the tip tool holding portion 16 so as to have a substantially D shape when viewed from the left side. A motor accommodating portion 3a for accommodating a motor (not shown) is formed between the handle portion 3b and the tip tool holding portion 16. The main housing 3 is formed of a synthetic resin such as plastic in a left-right split manner. The handle portion 3b is arranged at the rearmost end position of the hammer drill 1, and is formed so that the gripped portion when the user uses the hammer drill 1 is in a direction orthogonal to the axis A1 direction (here, a vertical direction). A power cord 15 is attached to one end side (lower end side) of the handle portion 3b in the extending direction, and a trigger lever 5a serving as an operation unit of the trigger switch is provided in front of the other end side (upper end side). The operator can switch between starting and stopping the motor (not shown), which is a drive source, by operating the trigger lever 5a while grasping the handle portion 3b.

The cylinder case cover 2 covers the outer peripheral portion of the impact rotation mechanism (not shown) protruding forward from the main housing 3, and is also a portion for holding the sub handle 30. A tip tool holding portion 16 is provided on the tip side of the cylinder case cover 2. A tip tool such as a bit or a drill (not shown) can be attached to the tip tool holding portion 16. A sub-handle mounting portion 20 is provided behind the cylinder case cover 2 in the axial direction. The sub-handle mounting portion 20 is a portion for mounting the sub-handle 30, and the outer surface is formed of a cylindrical surface so that the sub-handle 30 can be fixed at an arbitrary position in the circumferential direction about the axis A1. did. The front end of the sub-handle mounting portion 20 is formed with a stepped portion 21 having a slightly thicker diameter, and the rear end is formed with the enlarged diameter portion front end 2b of the cylinder case cover 2, and the stepped portion 21 and the enlarged diameter portion front end 2b are formed. The flat cylindrical surface between them is the area where the sub-handle 30 can be fixed. In the power tool of this embodiment, the sub-handle mounting portion 20 is formed coaxially with the rotary axis A1, but the central axis of the sub-handle mounting portion 20 and the axis A1 do not necessarily have to coincide with each other, and a predetermined offset is provided. It may be configured to have an amount.

The sub-handle 30 that can be attached to the cylinder case cover 2 has a rod shape extending in the radial direction from the axis A1 of the cylinder case cover 2, and a grip 60 for an operator to grip by hand is provided on the outer peripheral side thereof. The fixed position of the sub-handle 30 in the circumferential direction can be changed depending on the work mode and the operator. In the state of FIG. 1, the sub-handle 30 is attached so that the longitudinal direction of the sub-handle 30 is substantially parallel to the longitudinal direction of the handle portion 3b. The sub-handle 30 uses a mount 50 and a metal band 31, and the sub-handle 30 moves in the axial direction and the rotation direction in the axis A1 direction so as to tighten the outer peripheral surface of the sub-handle mounting portion 20 by the band 31. It is fixed so as not to. The shape of the portion exposed to the outside from the mount 50 of the band 31 after the sub handle 30 is attached is an arc shape.

FIG. 2 is a partially enlarged view of the cylinder case cover 2 of the hammer drill 1 and shows a state in which the sub handle 30 is removed from the state of FIG. A substantially cylindrical portion having a length L in the axis A1 direction, that is, a sub-handle mounting portion 20, is formed on the outer peripheral portion of the cylinder of the cylinder case cover 2 manufactured by molding the synthetic resin. The sub-handle mounting portion 20 is a cylindrical surface continuous in the circumferential direction, and its axial length L is made larger than the length of the band 31 of the sub-handle 30 and the mount 50 in the axis A1 direction. By making the length L of the sub-handle mounting portion 20 sufficiently longer than that of the band 31, the sub-handle 30 can be easily mounted. Further, since the outer peripheral surface of the sub-handle mounting portion 20 is a flat cylindrical surface without unevenness, the sub-handle 30 can be fixed at an arbitrary position in the circumferential direction. It is optional to provide a predetermined uneven portion on the sub-handle mounting portion 20, and it is also possible to form an uneven portion in the contact region of the mount 50 and fix it in a fitted state by both uneven portions.

The front side portion of the sub handle mounting portion 20 is a cylindrical portion 22 for covering the outer peripheral portion of the metal cylinder case 4, and a wind window 23 extending in the axis A1 direction is formed on the outer peripheral side of the cylindrical portion 22. .. The air window 23 is a passage for cooling air generated by a cooling fan (not shown). A tip tool such as a drill bit (not shown) can be attached to and detached from the tip tool holding portion 16. The sub-handle 30 shown in this embodiment can be applied to any power tool having a cylindrical sub-handle mounting portion in a part of the housing. Further, the type of the tip tool holding portion 16 is arbitrary.

3A and 3B are views showing the shape of the sub-handle 30, where FIG. 3A is a cross-sectional perspective view of the mount 50 and the grip 60, and FIG. C) is a cross-sectional perspective view of (A) with the band 31 and the handle bolt 40 attached. The band 31 is, for example, a long band-shaped member wound around the outer peripheral surface of the cylinder case 4 of the hammer drill 1, and is bent into a substantially U shape so as to draw a semicircle along the outer peripheral surface of the cylinder case 4. ing. The outer surface of the mount 50 is composed of four outer walls 51a to 51d (see FIG. 1 for 51c and 51d), and the band 31 and the handle bolt 40 which is a mounting member of the band 31 can be accommodated therein. The distance between the outer walls 51a and 51b of the mount 50 is formed so as to gradually widen toward the sub-handle mounting portion side in the axis B1 direction along the contour of the band 31, and the band 31 wound halfway around the cylindrical surface is radially outward. The shape is along the contour drawn out. The inner spacing of the outer walls 51c and 51d is formed wider than the band 31 so that the band 31 can be accommodated inside.

A plurality of ribs 54a to 54e extending in the longitudinal direction are formed on the inner portions of the outer walls 51a and 51b extending in a V shape. The ribs 54a to 54e are formed in the internal space of the mount 50, and are formed long in the direction parallel to the central axis B1 of the sub handle 30. Further, in the state where the sub handle 30 is attached as shown in FIG. 1, the ribs 54a to 54e cannot be visually recognized from the outside. Although the mount 50 is shown in cross section in the figure of FIG. 3A, since the mount 50 is manufactured by integral molding of synthetic resin, it cannot be divided in the direction orthogonal to the axis B1. That is, the outer walls 51a to 51d and the ribs 54a to 54e are integrally formed. The ribs 54a to 54e are positioned so that the tips of the ribs 54a to 54e near the sub-handle mounting portions 20 coincide with the positions of the outer surface of the band 31 when the ribs 54a to 54e are tightened with an appropriate strength. Therefore, when the handle bolt 40 is properly tightened, the end faces of the ribs 54a to 54e are pressed against the band 31, so that an appropriate tension can be applied to the band 31 and the relative movement between the band 31 and the mount 50 is restricted. Can be done. On the other hand, when the band 31 is insufficiently tightened, the surface pressure between the outer surface of the band 31 and the end faces of the ribs 54a to 54e is insufficient.

At the end of the outer wall 51d on the sub-handle mounting portion 20 side, a mounting surface 52 having an arc shape and in contact with the outer peripheral surface of the sub-handle mounting portion 20 is formed. Further, large cutout holes 53a and 53b are formed in the outer wall 51d. Although not visible from FIG. 3, the mounting surface 52 and the cutout holes 53a and 53b are similarly formed on the outer wall 51c (see FIG. 1) formed in parallel with the outer wall 51d. A storage space for the handle bolt 40 is formed in a portion of the mount 50 that is radially far from the sub-handle mounting portion 20. In the accommodation space, a rib 55 extending in the axial direction and holding the handle bolt 40 from the opposite two side surfaces is formed. Further, a through hole 57 for passing the handle bolt 40 is formed on the bottom surface of the mount 50 farthest from the sub handle mounting portion 20. Reinforcing ribs 56a and 56b slightly extending in the longitudinal direction are formed around the through hole 57 to suppress deformation around the through hole 57. The ribs 54a to 54e are formed separately on one side and the other side of the axis B1, and are also formed on the outer wall 51c (see FIG. 1) side and the outer wall 51d side in FIG. 3, respectively.

About half of the handle bolt 40 including the hook 43 is located inside the mount 50, and the other half is located inside the grip 60. A nut (not shown) is cast inside the grip 60, and the mount 50 and the grip 60 are connected by screwing the nut on which the female screw is formed with the screw portion 42 formed on the handle bolt 40. Further, since the cast nut can be rotated by rotating the grip 60 with respect to the central axis in the longitudinal direction, the position of the handle bolt 40 in the longitudinal direction (position in the axis B1 direction) can be easily changed. In this way, the peripheral length of the band 31 exposed from the mount 50 can be adjusted with respect to the sub-handle mounting portion 20 by simply rotating the grip 60, and the band 31 can be tightened or loosened. When the band 31 is properly tightened, the ends of the ribs 54a to 54e of the mount 50 and the outer peripheral surface of the band 31 are in good contact with each other, and the mount 50 and the sub-handle mounting portion 20 are also in the axial direction with respect to the axis A1. It also becomes immovable in the circumferential direction.

A mounting portion 58 for holding a stopper rod (not shown) is formed on a part of the mount 50. The mounting portion 58 is formed with a cylindrical hole portion 58a that opens in the direction of the axis A1 (see FIG. 1). The stopper rod is a rod used for adjusting the drilling depth with a tip tool. A stopper rod (not shown) is inserted into a cylindrical hole, and a wing bolt 59 is tightened at an arbitrary position of the stopper rod in the axis A1 direction. Fix the stopper rod so that it does not move. By using the stopper rod in this way, it is possible to perform drilling work using the hammer drill 1 so that the stopper rod abuts against the material when the hole reaches a predetermined depth, so that holes of the same depth can be continuously drilled. When multiple holes are opened, work efficiency is improved and the hole depth is accurate.

The grip 60 has a long cylindrical shape and has a thickness and length preferable for the operator to grip by hand, one end side is connected to the mount 50, and the other end side is a free end. The grip 60 is formed of a cylindrical base portion 61 made of synthetic resin and an elastic elastic member 65 such as rubber covered on the outer peripheral side of the cylindrical base portion 61. The end portion of the cylindrical base portion 61 near the sub-handle mounting portion 20 is a closed wall portion 62 in which a through hole 62a (described later) is formed. Further, a flange portion 63 extending radially outward from the outer peripheral surface of the cylindrical base portion 61 is formed at a position substantially the same as the closed wall portion 62 in the longitudinal direction. The other end side of the cylindrical base portion 61, that is, the side far from the sub handle mounting portion 20 (anti-sub handle mounting portion side) has an opening 61a. A plurality of recesses 61b recessed inward in the radial direction are formed in the cylindrical base portion 61, and the elastic member 65 is held so as not to move relative to each other by covering the entire outer peripheral surface of the recess 61b with the elastic member 65. Will be done. The elastic member 65 is manufactured, for example, by integral molding of rubber, or is formed on the outside of the cylindrical base portion 61 by double-layer molding. A dropout prevention rib 61c having an L-shaped cross section is formed near the end of the cylindrical base portion 61 on the side of the anti-sub handle mounting portion. By covering the flange portion 63 and the fall prevention rib 61c, a stable grip 60 can be realized in which the elastic member 65 does not move in the longitudinal direction with respect to the cylindrical base portion 61 and does not rotate relative to the rotation direction. When tightening the band 31, the grip 60 is rotated in the direction in which the screw is tightened. When the screw is rotated in the tightening direction, the handle bolt 40 moves in the axis B1 direction with respect to a nut (not shown) fixed to the grip 60.

4A and 4B are views for explaining the procedure for assembling the handle bolt and the band 31, where FIG. 4A shows the procedure of the present embodiment and FIG. 4B shows the procedure of the conventional example. The procedure is almost the same. The ends of the band 31 (mounting portion 34) are held so as to be separated from each other as shown by the arrow 36, and the handle bolts 40 or 140 are moved as shown by the arrow 38 for mounting. The hooking portion 43 is sandwiched between the portions 34. Then, the radial extending portion 45 or 145 is passed through the through hole 35. With the band 31 hooked on the radially extending portion 45 or 145 in this way, the handle bolt 40 or 140 is inserted into the mount 50.

Here, problems in assembling the conventional handle bolt 140 will be described with reference to FIG. FIG. 14 is a diagram illustrating a procedure for temporarily fixing the conventional handle bolt 140 and the band 31. The metal band 31 is pre-bent as shown in FIG. 14 (A). The upper side in the figure is a semicircular portion 32 having a radius _R1 and is a portion that comes into contact with the outer peripheral surface of the sub-handle mounting portion 20. The area between the semicircular portion 32 and both end portions 31a and 31b of the band 31 is formed in a facing shape so as to be parallel to the connecting portion 33 formed so as to be close to each other on the tip end side of the connecting portion 33. A bent mounting portion 34 is formed. As shown in FIG. 4, a rectangular through hole 35 is formed in the mounting portion 34, and the band 31 is hooked by engaging the through hole 35 with the radial extending portion 145 of the handle bolt 140. Here, when the band 31 is hooked on the handle bolt 140, the band 31 is deformed so that the mounting portion 34 is separated as shown by the arrow 36 in FIG. 14B, the handle bolt 140 is positioned between them, and the handle bolt 140 is placed. The radial extending portion 145 of the above is passed through the through hole 35. Then, the restoring force of the metal band 31 causes the mounting portion 34 to move and be held in the approaching direction as shown by the arrow 37. However, it is a story in a state where the band 31 is not wound around the sub handle mounting portion 20.

When the sub-handle 30 is attached to the sub-handle mounting portion 20, the band 31 is circulated around the sub-handle mounting portion 20 as shown by the dotted line, and then the work shown in FIG. 14B is performed. At this time, in order to tighten the sub handle mounting portion 20 with the band 31, it is necessary that the radius R of the sub handle mounting portion 20 is larger than the radius R ₁ of the semicircular portion 32 of the band 31 before tightening. .. Then, even if the end portion of the band 31 is to be held by the radial extending portion 145 of the handle bolt 140 as shown in FIG. 14, the mounting portions 34 act in the direction away from each other due to the relationship of R ₁ <R. The operator must manually hold both ends of the band 31 in the direction of arrow 37. As a result, when the hand holding in the direction of the arrow 37 slips during the assembly work of inserting the handle bolt 140 into the internal space of the mount 50, the engagement state between the radial extension portion 145 and the through hole 35 is disengaged. There was a case that it ended up. In this embodiment, the shape of the handle bolt 140 is changed to compensate for the conventional drawback, and as shown in FIG. 4A, the handle bolt 40 is perpendicular to the upper side in the axial direction from the outer end portion of the radial extension portion 45. A protruding portion (parallel direction extending portion 46 shown in FIG. 5) was formed so as to extend.

5A and 5B are views showing the shape of the handle bolt 40, where FIG. 5A is a side view and FIG. 5B is a top view. The handle bolt 40 has a male screw-shaped threaded portion 42 (not shown) formed at one end (lower end in the figure) in the longitudinal direction, and a hooking portion 43 is formed on the opposite end side. By passing a part of 43 through the through hole 35 of the band 31, the band 31 can be pulled downward in the longitudinal direction. It is preferable that the hooking portion 43 is formed integrally with the spindle portion 41 of the handle bolt 40. The hooking portion 43 is a cylindrical or square columnar connecting portion 44 extending in the longitudinal direction, a radial extending portion 45 formed so as to extend radially outward at the upper end portion of the connecting portion 44, and a radial extending portion. It is composed of a parallel extending portion 46 formed so as to extend upward from the end portion of the 45. The radial extending portion 45 is a square columnar portion, and the parallel extending portion 46 has a rectangular parallelepiped shape. The radial direction referred to here is the radial direction around the axis B1 of the handle bolt 40 which is a member for fixing the band 31, and the parallel direction means the direction parallel to the longitudinal axis B1. By changing the shape of a part of the hooking portion 43 in this way, as compared with the conventional handle bolt 140 shown in FIG. It can also be seen that the shape is concave like 47. In this way, by forming the recess 47 in a part of the hooking portion 43, the vertical surface 45a formed by the radial extending portion 45 extending toward the radial outer side of the main shaft portion 41 is parallel to the vertical surface 45a. Since the parallel surface 46a formed on one side of the extending portion 46 (the side close to the axis B1) is formed, the band 31 is temporarily fixed by the internal angle portion 48 formed by the vertical surface 45a and the parallel surface 46a. It becomes possible.

In the side view of the radial extending portion 45, the width in the long side direction is W, and the width W ₁ of the portion of the recess 47 is formed to be smaller than W. At this time, the center position of the width W and the center position of the width W1 _match , and it is also a position that coincides with the axis B1. Further, the total height of the radial extending portion 45 and the parallel extending portion 46 is H, and the width in the short side direction of the radial extending portion 45 when viewed from above is D. The width D is equal to the width in the long side direction in the top view of the parallel extending portion 46. As described above, since the height H and the width D are equal to the height and width of the radial extension portion of the conventional handle bolt 140 shown in FIG. 4 (B), the metal band 31 has been conventionally used. You can use what you have.

Next, a procedure for temporarily fixing the handle bolt 40 and the band 31 will be described with reference to FIG. The basic procedure is the same as the conventional procedure described with reference to FIG. 14 up to the middle. First, as shown in FIG. 6A, the attachment portion 34 of the band 31 is expanded as shown by the arrow 36, and the handle bolt 40 according to the present embodiment is inserted between them in the direction of the arrow 38. Next, as shown in FIG. 6B, the mounting portion 34 of the band 31 is approached as shown by an arrow 37 so that the radial extending portion 45 and the parallel extending portion 46 are inserted into the through hole 35 of the band 31. The band 31 is moved until it comes into contact with the outer surface of the prism connecting portion 44b. From this state, as shown in FIG. 6C, after moving the handle bolt 40 in the direction of arrow 38 with respect to the band 31, that is, in the longitudinal direction toward the sub-handle mounting portion 20, the arrow 37 indicates. Release the hand that was holding down from the band 31. At this time, the band 31 is wound around the sub-handle mounting portion 20, and the radius _R1 of the semicircular portion 32 of the band 31 before tightening is smaller than the radius R of the sub-handle mounting portion 20, so that the band 31 The ends 31a and 31b move in the direction away from each other (direction of arrow 36) due to the restoring force of. Due to this movement, the outer edge of the through hole 35 of the band 31 comes into contact with the parallel surface 46a (see FIG. 5) formed by the parallel extending portion 46, so that the contact state is maintained and the handle bolt 40 and the handle bolt 40 are brought into contact with each other. The band 31 will be temporarily fixed.

FIG. 7 is a view showing the relationship between a part of the temporarily fixed handle bolt 40 (near the through hole 35) and the band 31, and is a side view seen from a different angle from FIG. Here, since the parallel extending portion 46 is located above the through hole 35 shown by the dotted line, the ends 31a and 31b are separated by the restoring force of the band 31 (arrow 36 in FIG. 6A). The band 31 is in contact with the parallel surface 46a (see FIG. 5) of the parallel extending portion 46 even if it tries to be deformed in the direction of). In this way, the restoring force when the band 31 is attached to the sub-handle mounting portion 20 and the contact friction with the newly provided parallel surface 46a enable temporary fixing. Therefore, the states shown in FIGS. 6 (C) and 7 are shown. Even when the assembly of the above is mounted inside the mount 50, it can be stably and temporarily fixed. In particular, even if the band 31 side is pressed by hand and the mount 50 is pushed into the handle bolt 40, the direction of the force transmitted from the band 31 to the handle bolt 40 is such that the edge of the through hole 35 of the band 31 is vertical. Since it coincides with the direction of contact with the surface 45a, there is no possibility that the temporarily fixed state will be released. Therefore, when assembling the sub-handle 30, the engagement state between the radial extending portion 145 and the through hole 35 is almost eliminated, and the assembling efficiency is greatly improved. Further, since the operation of temporary fixing as shown in FIG. 6C is extremely simple, anyone can operate it, so that the sub handle 30 can be easily attached.

8 is a view showing a handle bolt 70 according to a second embodiment of the present invention, FIG. 8A is a side view, and FIG. 8B is a perspective view. The basic configuration is the same as that of the first embodiment, and the parts having the same configuration are designated by the same reference numeral. The difference here is that the parallel extending portion 76 is formed below the radial extending portion 75. As a result, the parallel surface 76a and the vertical surface 75a are formed on the lower side of the radial extending portion 75. From a different point of view, it is the lower side of the parallel extending portion 76 (on the side of the anti-sub-handle mounting portion 20), and has a shape in which recesses 77 recessed upward are formed on both sides of the connecting portion 44. By forming the two recesses 77 on the lower side of the radially extending portion 75 in this way, temporary fixing to the band 31 is possible. When the handle bolt 70 is used, the parallel extending portion 76 passes the radial extending portion 75 through the inside of the through hole 35 of the band 31 by the method shown in FIGS. 6A and 6B, and then FIG. All that is required is to move the handle bolt 70 in the direction opposite to the arrow 38 in (C). As a result, when the parallel surface 76a formed on the lower side of the radial extending portion 75 and the band 31 come into contact with each other, the temporarily fixed state of the handle bolt 70 and the band 31 is maintained by the frictional force. After that, if the handle bolt 70 is pulled and set in the internal space of the mount 50, the temporary fixing state of the handle bolt 70 and the band 31 is not released, and the handle bolt 70 and the grip 60 are screwed together. Can be easily performed.

9 is a view showing a handle bolt 80 according to a third embodiment of the present invention, (A) is a side view, and (B) is a perspective view. In the third embodiment, the cubic parallel extending portion 86 is provided on the radial tip side of the radial extending portion 85. Further, a recessed portion 87 having a reduced thickness is formed between the radial extending portion 85 and the parallel extending portion 86. The cross-sectional shape of the recess 87 may be columnar or prismatic. As a result, the vertical surface 87a is formed by the recessed portion 87, and the parallel surface 86a extending in all directions so as to be orthogonal to the vertical surface 87a is formed. The shapes of the cylindrical connecting portion 44a and the prism connecting portion 44b on the lower side of the radial extending portion 85 are the same as those in the first embodiment. Also in this figure, the male screw-shaped screw portion formed near the lower end portion of the spindle portion 41 is not shown. Here, assuming that the height of the radial extending portion 85 is H ₁ , the width is D, the height of the parallel extending portion 86 is H, and the width is D ₁ , the relationship of H> H ₁ and D> D ₁ is satisfied. Therefore, the parallel extending portion 86 can penetrate the through hole 35 of the band 31. However, the height and width of the radial extending portion 85 and the parallel extending portion 86 are arbitrary as long as they are smaller than the size of the through hole 35. On the contrary, by forming the recess 87 as a recess having a radial width equal to or larger than the plate thickness of the band 31, a vertical surface 87a intersecting the parallel surface 86a is formed inside the parallel extending portion 86. Therefore, the band 31 can be easily temporarily fixed. In this embodiment, as shown in FIG. 9, since the recessed portion 87 is formed so as to be recessed from each of the four surfaces of the radial extending portion 85, the moving direction of the handle bolt 80 when temporarily fixing the band 31, that is, that is, There is an advantage that the moving direction corresponding to the arrow 38 in FIG. 6 may be not only upward but also downward, forward, backward, or any direction.

10A and 10B are views showing a handle bolt 90 according to a fourth embodiment of the present invention, where FIG. 10A is a side view and FIG. 10B is a perspective view. The idea of the fourth embodiment is that the substantially rectangular parallelepiped portion of the parallel extending portion 86 in FIG. 9 is twisted by approximately 45 degrees around the longitudinal center line of the radial extending portion 85. be. However, for convenience of manufacturing, as shown in FIG. 10B, the shape is such that two quadrangular prisms are overlapped at different angles. The parallel extending portion 96 has a shape that is rotated by about 45 degrees with respect to the radial extending portion 95 when viewed from the right side or the left side surface. A recess 97 is formed between the radial extending portion 95 and the parallel extending portion 96. However, the dent 97 is only formed from the top to the bottom and from the bottom to the top, and there is no dent in the left-right direction. By rotating the attachment of the parallel extending portion 96 in this way, the method of temporarily fixing to the band 31 becomes unique.

FIG. 11 is a diagram showing a procedure for attaching the handle bolt 90 of FIG. 10 to the band 31. In FIG. 11A, the portion of the parallel extending portion 96 of the handle bolt 90 is passed through the through hole 35 of the band 31. As can be understood from the figure, since the outer diameter of the parallel extending portion 96 is a substantially rectangular parallelepiped, the parallel extending portion 96 is formed through the through hole 35 with the main shaft portion 41 tilted about 45 degrees to the right from the vertical direction. To penetrate. After penetrating, the band 31 is positioned so as to be in the same position as the recess 97 when viewed in the front-rear direction. FIG. 11B is a view of the state viewed from the left direction orthogonal to (A). Here, the outer surface of the band 31 is in close contact with the parallel surface 96a on the inner surface side of the parallel extending portion 96. Here, the radial direction means the radial direction seen from the axis B1, and the parallel direction means parallel to the axis B1. After the handle bolt 90 is passed through the through hole of the band 31 as shown in FIG. 11B, the spindle portion is rotated from the position of 41'shown by the dotted line to the position of 41 shown by the solid line as shown in FIG. As a result, a part of the parallel extending portion 96, that is, the upper corner portion 96b and the lower corner portion 96c are in contact with the outer surface of the band 31 beyond the outer edge position of the through hole 35. As a result, after the handle bolt 90 is attached to the band 31 as shown in FIG. 12, the hooked state of the handle bolt 90 and the band 31 cannot be resolved unless the spindle portion 41 is returned to the position of 41'indicated by the dotted line. After that, the work of assembling to the mount 50 becomes extremely easy.

FIG. 13 is a cross-sectional perspective view showing a state after the handle bolt 90 is attached to the mount 50 from the state of FIG. As can be understood from this figure, the band 31 is hung on the handle bolt 90 and a tensile force is applied to the lower side in the axis B1 direction. At this time, as described with reference to FIGS. 10 to 12, the handle bolt 90 cannot be removed from the through hole 35 of the band 31 unless the handle bolt 90 is tilted by about 45 degrees. Therefore, the handle bolt 90 is set in the mount 50 as shown in FIG. Then, it means that the handle bolt 90 and the band 31 cannot be removed. With this configuration, the band 31 and the handle bolt 90 will not come off during assembly, and can be reliably incorporated into the mount 50. Further, the present invention can be carried out by simply changing the conventional handle bolt 140 to the handle bolt 90 of the fourth embodiment without changing other components of the sub-handle 30.

Although the present invention has been described above based on the examples, the present invention is not limited to the above-mentioned examples, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the configuration in which the sub handle 30 is attached to the cylinder case cover 2 of the hammer drill 1 has been described, but the object to which the sub handle 30 can be attached is not limited to the hammer drill 1, and a cylinder that can be tightened with a band. It can be applied to various power tools that have a shaped sub-handle mounting part.

1 Hammer drill 2 Cylinder case cover 2b Diameter expansion part Front end 3 Main housing 3a Motor housing part 3b Handle part 4 Cylinder case 5a Trigger lever 15 Power cord 16 Tip tool holding part 20 Sub handle mounting part 21 Step part 22 Cylindrical part 23 Wind window 30 Sub Handle 31 Band 31a, 31b End 32 Semicircle 33 Connecting part 34 Mounting part 35 Through hole (band hole part) 40 Handle bolt (fixing member)
41 Main shaft part 42 Threaded part 43 Hooking part 44 Connection part 44a Cylindrical connection part 44b Prism connection part 45 Radial extension part 45a Vertical surface 46 Parallel extension part (temporary fixing part)
46a Parallel surface 47 Recess 48 Inner corner 50 Mount 51a-51d Outer wall 52 Mounting surface 53a, 53b Cutout hole 54a-54e Rib 55 Rib 56a, 56b Rib 57 Through hole 58 Mounting part 58a Cylindrical hole 59 Butterfly bolt 60 Grip 61 Cylindrical base Base 61a Opening 61b Recess 61c Falling prevention rib 62 Closing wall 62a Through hole 63 Border 65 Elastic member 70 Handle bolt 75 Radial extension 75a Vertical surface 76 Parallel extension 76a Parallel surface 77 Recess 80 Handle bolt 85 Radial extension 86 Parallel extension 86a Parallel surface 87 Recess 87a Vertical surface 90 Handle bolt 95 Radial extension 96 Parallel extension 96a Parallel surface 96b Upper corner 96c Lower corner 97 Recess 140 Handle Bolt 141 Main Shaft 145 Radial Extension A1 (Tip Tool) Rotating Axis B1 (Handle Bolt) Axis

Claims (12)

With the drive source
With a housing for accommodating the drive source,
The housing has a handle portion and a cylindrical sub-handle mounting portion provided apart from the handle portion.
A power tool having a sub-handle, which is attached to the sub-handle mounting portion.
The sub handle is
A band fixed by tightening the sub-handle mounting portion,
A fixing member that engages with both ends of the band drawn out by winding it around the outer surface of the sub-handle mounting portion.
A mounting surface that abuts on the outer peripheral surface of the sub-handle mounting portion is formed, and a mounting portion that holds the band and the fixing member, and a mounting portion.
By engaging with the fixing member protruding radially outward from the mount portion and moving the fixing member relative to the mount portion, both ends of the band are pulled and the sub handle is pulled. It has a grip portion that tightens the mounting portion and fixes the fixing member and the band.
The fixing member has a spindle portion and a hooking portion formed on one end side of the spindle portion to hold the band so as not to move in the radial direction and the circumferential direction of the sub handle mounting portion .
The hooking portion has a radial extending portion extending in two directions toward the radial outer side of the main shaft portion and a temporary fixing portion extending in an orthogonal direction from the tip portion of the radial extending portion. death,
A power tool characterized in that a parallel surface extending in parallel with the axis of the fixing member is formed inside the temporary fixing portion in the radial direction . The power tool according to claim 1 , wherein the hooking portion forms a right-angled internal angle portion by the temporary fixing portion and the radial extending portion. The band is bent in a substantially U shape to form a mounting surface having two ends substantially parallel and close to each other, and the temporary fixing portion and the radial extending portion are passed through the mounting surface and the diameter thereof. A through hole that can be engaged with the extending portion in the longitudinal direction of the sub handle is formed.
By forming the band so that the distance between the mounting surfaces after winding the band around the sub-handle mounting portion is larger than the distance between the two temporary fixing portions, the band by the temporary fixing portion is formed. The power tool according to claim 1 or 2, wherein the power tool can be temporarily fixed. The grip portion and the mount portion are made of separate parts, and the male screw portion of the fixing member held inside the mount portion and protruding toward the grip portion is screwed into the female screw portion of the grip portion. By allowing the grip portion to rotate around the axis of the fixing member, the grip portion can rotate.
By rotating the grip portion, the fixing member is relatively moved with respect to the mount portion, and both ends of the band are pulled outward in the radial direction of the sub handle mounting portion so that the sub handle mounting portion can be tightened. The power tool according to claim 3, wherein the power tool is characterized by the above. The hooking portion is formed integrally with the spindle portion, and has a vertical surface extending in the vertical direction from the axis of the fixing member and the parallel surface.
The power tool according to claim 4, wherein the band is temporarily fixed in a state where the parallel surface is in contact with the outer surface of the band. The power tool according to claim 5, wherein the vertical surface of the temporary fixing portion is formed so as to face the axis side of the fixing member. The power tool according to claim 6, wherein the parallel surface of the fixing member is formed on the sub-handle mounting portion side of the radial extending portion. The power tool according to claim 6, wherein the parallel surface of the fixing member is formed on the anti-sub-handle mounting portion side of the radial extending portion. The hooking portion is composed of a quadrangular prism member mounted so as to be orthogonal to the axis of the main shaft portion, and each of the four side surfaces of the quadrangular pillar member extending radially outward from the axis of the fixing member. The power tool according to claim 1, wherein the band can be temporarily fixed by forming a recessed portion thereof. The band has a through hole through which the radial extension penetrates.
Claim 1 is characterized in that the temporary fixing portion rotates about the extending direction of the radial extending portion to switch between a state in which the temporary fixing portion can pass through the through hole and a state in which the temporary fixing portion cannot pass through the through hole. Power tools listed in. The band consists of a semicircle, a connecting portion extending radially outward from the two ends of the semicircle, and a mounting portion formed in parallel by bending the tip of the connecting portion. Shaped to have two parts
The power tool according to any one of claims 1 to 10, wherein the mounting portion is formed with a through hole for penetrating the radial extending portion and the temporary fixing portion. The power tool is a hammer drill having a tip tool, a striking force conversion mechanism for applying an axial striking force to the tip tool, and a rotational force transmission mechanism for applying a rotational force to the tip tool. The power tool according to any one of 1 to 11.

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