JP6650743B2 - Electric tool - Google Patents

Description

  The present invention relates to a power tool and its cover.

  For example, when performing a polishing operation using an electric sander, the gripping portion of the electric sander is firmly held or pressed by hand. In this case, an anti-slip layer may be provided on the surface of the gripper of the electric sander to prevent the slip. In Patent Document 1 below, an elastic layer made of an elastomer is provided on a grip portion by thermal welding. However, since the elastic layer gradually deteriorates over time, the anti-slip effect gradually decreases. In addition, the elastic layer that has been thermally welded may peel off due to long-term use.

JP 2005-279891 A

  Therefore, an object of the present invention is to provide a power tool and a cover for the power tool, which can maintain the anti-slipping effect of the grip portion for a long period of time in view of the above conventional problems.

  The present invention has been made to solve the above problems, and an electric tool according to the present invention includes a rubber cover detachably attached to a grip portion of a tool body by elasticity. I do.

  In the electric tool having such a configuration, a rubber cover can be detachably attached to the grip portion of the tool body by utilizing its elasticity. Therefore, for example, when the attached cover is deteriorated due to long-term use and the anti-slip performance is reduced or becomes dirty, it can be easily replaced with a new one.

  In particular, the tool body includes an upper grip portion as a grip portion having an upper surface against which a hand is pressed from above, and an extending portion extending outward, and the cover covers the upper grip portion of the tool body from above. A tool body having an upper cover portion and an upper grip portion of the tool body in a state where the inserted portion is inserted through the extension portion of the tool body. It is preferable to attach to the tool body by utilizing the elasticity of the cover.

  Further, the extension portion is a grip portion that constitutes a part of the grip portion, the upper grip portion has a shape protruding outward in a flange shape, and the inserted portion of the cover is an outer peripheral surface of the grip portion of the tool body. It is a cylindrical tubular cover portion that covers, the upper cover portion of the cover preferably has an opening that opens to the lower side, and is preferably attached to the upper grip portion so as to expand the opening portion, High adhesion of the cover is obtained.

  Further, a power cord extends from the grip portion, an opening is formed at an end of the tubular cover portion, and the cover can be attached and detached so that the power cord passes through the tubular cover portion. Preferably, the cover can be easily detached from the power cord.

  Further, it is preferable that the elongation percentage of the cylindrical cover part when attached to the tool body is larger than the elongation percentage of the upper cover part. It should be noted that (elongation ratio) = (perimeter difference) / (perimeter of outer peripheral surface of tool body), and (difference of perimeter) = (perimeter of outer peripheral surface of tool body) − (inner circumference of cover) Perimeter of the surface). The difference in circumferential length is the difference between the circumferential length of the outer peripheral surface of the grip portion of the tool body and the circumferential length of the inner peripheral surface of the cylindrical cover portion in the cylindrical cover portion. The difference between the circumferential length of the outer surface of the upper grip portion of the tool body and the circumferential length of the inner surface of the upper cover portion in a cross-sectional view cut along the cutting plane in the direction. Here, the peripheral length of the inner peripheral surface of the tubular cover portion and the peripheral length of the inner surface of the upper cover portion are in a state before the cover is attached to the grip portion of the tool body, that is, in a natural state of the cover. In the case of the cylindrical cover portion, the difference between the peripheral length of the outer peripheral surface of the grip portion of the tool main body and the peripheral length of the inner peripheral surface of the cylindrical cover portion is determined by calculating the difference between the outer peripheral surface of the grip portion of the tool main body. In the upper cover portion, in the cross-sectional view cut along the vertical cutting surface, the peripheral length of the outer surface of the upper grip portion of the tool body, and the peripheral length of the inner surface of the upper cover portion. Is divided by the circumference of the outer surface of the upper gripping portion of the tool body. As described above, by making the elongation percentage of the cylindrical cover part larger than the elongation percentage of the upper cover part, the tightness of the cylindrical cover part to the tool body becomes larger than that of the upper cover part. Therefore, the cylindrical cover portion can be more firmly adhered to the grip portion that requires a high anti-slip effect.

  In addition, a suction port is formed in the grip portion of the tool body, a ventilation port is formed in the cover so as to correspond to the suction port, and an opening edge of the ventilation port on the inner surface side of the cover is formed on the entire periphery thereof. It is preferable that a convex portion is formed over the entire surface. On the inner surface side of the cover, that is, at the opening edge of the ventilation hole on the back surface side of the cover, a convex portion is formed over the entire periphery of the opening edge, so that the periphery of the ventilation hole is locally thickened. It is reinforced. Therefore, it is possible to prevent the cover from being torn starting from the opening edge of the vent. Further, by providing a convex portion on the inner surface side of the cover and at the opening edge of the ventilation hole, excessive extension of the cover can be prevented, the cover can be accurately attached at a predetermined position, and the The displacement of the vent of the cover can be suppressed. Furthermore, the convex portion makes the opening edge of the ventilation hole of the inner surface of the cover locally thicker than other portions, and the inner surface of the cover becomes uneven, so that the vibration of the tool body is hardly transmitted to the hand. Work becomes easier.

  Further, the cover for a power tool according to the present invention is made of rubber which is detachably attached to a grip portion of the power tool by elasticity.

  As described above, since the cover can be easily replaced, a high anti-slip effect can be easily maintained.

The perspective view showing the electric power tool (tool main part) in one embodiment of the present invention. The top view which looked at the same electric tool from the upper side. The figure which looked at the electric power tool from the side. The front view which looked at the same electric tool from the front side. The rear view which looked at the same power tool from the back side. The perspective view which looked at the cover attached to the electric power tool from the plane side. The perspective view which looked at the cover from the lower side. The top view which looked at the cover from the upper side. The figure which looked at the same cover from the side. The bottom view which looked at the cover from the lower side. The front view which looked at the cover from the front side. The rear view which looked at the cover from the back side. AA sectional drawing of FIG. FIG. 9 is a sectional view taken along line BB of FIG. 8. (A) is CC sectional drawing of FIG. 8, (b) is DD sectional drawing of FIG. The top view which looked at the state which attached the cover to the electric power tool from the upper side. The figure seen from the side which shows the state where the cover was attached to the electric power tool. EE sectional drawing of FIG. FF sectional drawing of FIG. GG sectional drawing of FIG. The figure seen from the side which shows the state in the middle of attaching a cover to the power tool.

  Hereinafter, an electric tool 1 (tool main body) according to an embodiment of the present invention and a cover 2 attached to the electric tool 1 will be described with reference to FIGS. The power tool 1 may be of various types, but the present embodiment exemplifies an electric sander. The type of the electric sander may be various, and may be various sanders such as an orbital sander, a random sander, a belt sander, and a disk sander. In the present embodiment, the orbital sander is exemplified. In particular, although the polishing part has a square shape, it may have a triangular shape. In addition, an electric sander that is held by both hands may be used, but in the present embodiment, a type that is held by one hand, that is, a so-called palm sander is exemplified.

<Electric tool 1 (tool body)>
First, the power tool 1 (tool main body) will be described. The power tool 1 includes a motor 10 (see FIGS. 18 and 19), a housing 11 that houses the motor 10, and a polishing unit that is driven by the motor 10. A polishing plate 12 is provided. The motor 10 is housed in the housing 11 so that its axis is in the vertical direction, and therefore, the main shaft 13 of the motor 10 is along the vertical direction. The driving force of the motor 10 is transmitted from the main shaft 13 to the polishing plate 12 via a known transmission mechanism. The lower end of the housing 11 is open, and the polishing plate 12 is located below the housing 11. A polishing paper such as sandpaper (not shown) is detachably attached to the lower surface of the polishing plate 12. The polishing plate 12 is installed eccentrically with respect to the main shaft 13 of the motor 10, and swings in a plane parallel to the lower surface. In this embodiment, the polishing plate 12 has a horizontally long rectangular shape slightly longer in the left-right direction, but may have a vertically long rectangular shape or a square shape longer in the front-rear direction.

<Housing 11>
The housing 11 is formed in a cylindrical shape as a whole with an upper end closed and a lower end opened, and can be divided into three parts: an upper part, a middle part, and a lower part. That is, as shown in FIGS. 1 to 5, the housing 11 includes a body portion 21 as a middle portion, a grip portion 20 as an upper portion located above the body portion 21, and a lower portion located below the body portion 21. And a skirt portion 22 as the main body. The body 21 is substantially cylindrical. The skirt portion 22 is larger than the trunk portion 21, extends gradually downward from the lower end portion of the trunk portion 21, and then extends vertically downward from there. The skirt portion 22 is evenly larger than the trunk portion 21 in both the front-rear direction and the left-right direction. The skirt portion 22 is rectangular in plan view or bottom view according to the shape of the polishing plate 12, and is square in the present embodiment. As shown in FIG. 2, in plan view, the polishing plate 12 is larger than the lower end of the skirt portion 22, and is longer in both the front-back dimension and the left-right dimension. In addition, an air inlet 14 for taking in air into the housing 11 is formed in the grip portion 20, and specifically, the upper surface of the upper grip portion 23, the left and right side surfaces, and the lower surface of the grip portion 24 which will be described later. A mouth 14 is formed. Further, an exhaust port 15 for discharging air from the housing 11 is formed at a lower portion of the skirt portion 22, specifically, on both left and right sides. Then, the air that has entered from the intake port 14 flows downward in the housing 11 and is discharged from the exhaust port 15, and the flow of the air in the housing 11 cools the motor 10.

<Grip section 20>
The grip 20 has a shape protruding outward in the horizontal direction over the entire circumference with respect to the upper end of the body 21. The grip portion 20 is located immediately above the body portion 21 and has an upper grip portion 23 on which a hand is pressed from above on the upper surface at the time of work, and extends rearward from the upper grip portion 23 during work. And a grip portion 24 to be gripped.

<Upper grip 23>
The upper gripping portion 23 has a shape protruding outward in a flange shape over the entire periphery of the upper end portion of the body portion 21 except for the rear portion, that is, on the front side and both left and right sides. Specifically, as shown in FIG. 3, the front portion of the upper grip 23 projects forward from the body 21. In addition, as shown in FIGS. 4 and 5, the left and right sides of the upper grip portion 23 protrude from the body 21 to the left and right sides, respectively. However, the amount of protrusion of the upper grip 23 from the trunk 21 at the front part is greater than the amount of protrusion of the upper grip 23 from the trunk 21 at the left and right sides, and the trunk at the left and right sides of the upper grip 23. The amounts of protrusion from 21 are equal to each other. As shown in FIG. 2, the upper grip 23 has a substantially oval shape that is longer in the front-rear direction than in the left-right direction in plan view. In addition, constricted portions 25 that are recessed inward are formed at the boundaries between the left and right sides of the upper grip 23 and the body 21.

  Also, as shown in FIGS. 4, 5 and 19, the upper surface of the upper grip portion 23 is curved upwardly convex in a cross-sectional view taken along a vertical and horizontal cross section. Is a semi-elliptical shape of an upper half having a long axis in the left-right direction and a short axis in the up-down direction, or a semi-elliptical shape long in the left-right direction. Also, as shown in FIGS. 3 and 18, the upper surface of the upper gripping portion 23 has a slight area from the rear to the front in a cross-sectional view cut along a vertical and a front-rear cutting plane passing through the rotation center of the motor 10. And slowly descending. An opening 26 that opens to the front side is formed at the front end of the grip portion 20, and an ON / OFF switch 16 for operating and stopping the motor 10 is exposed from the opening 26. In the present embodiment, the ON / OFF switch 16 is a right and left seesaw type. Therefore, the opening 26 has a correspondingly long shape in the left-right direction.

<Grip part 24>
The grip portion 24 extends continuously from the rear portion of the upper grip portion 23 toward the rear side. The grip portion 24 has a cylindrical shape having an axis in the front-rear direction, and its internal space is integral with that of the upper grip portion 23 and has an open rear end. The grip portion 24 extends horizontally toward the rear side as shown in FIGS. As shown in FIG. 2, the grip portion 24 has a gradually decreasing size (width) in the left-right direction toward the rear side in a plan view. That is, the width of the grip portion 24 decreases as the distance from the upper grip portion 23 increases, and increases as the grip portion 24 approaches the upper grip portion 23. As shown in FIG. 3, the upper portion of the outer peripheral surface of the grip portion 24 extends continuously and smoothly from the upper surface of the upper grip portion 23 without any step, and slightly lowers from the front to the rear of the upper portion of the outer peripheral surface. are doing. At the rear of the grip 24, a step 27 is formed over the entire circumference, and the portion behind the step 27 is one step narrower than the front. The lower half region of the step portion 27 is perpendicular to the front-rear direction, that is, to the axial direction of the grip portion 24, whereas the upper half region of the step portion 27 extends obliquely toward the front side. .

  The power cord 17 passes through the inside of the grip part 24, and the power cord 17 extends rearward from the rear end of the grip part 24. Specifically, as shown in FIG. 18, a front portion of a tubular cord holder 18 is fitted inside a rear portion of the grip portion 24, and a power cord 17 passes through the inside of the cord holder 18. Note that the cord holder 18 also extends horizontally toward the rear side.

  The housing 11 is made of a hard synthetic resin such as polyamide (PA), and is formed by injection molding. In the present embodiment, the housing 11 is composed of two parts, upper and lower, and includes a lower housing 11a having upper and lower ends and an upper housing 11b for closing an upper end opening of the lower housing 11a. The lower housing 11a forms a lower portion (lower half region) of the grip portion 20, a body portion 21, and a skirt portion 22, and the upper housing 11b forms an upper portion (upper half region) of the grip portion 20. . However, the housing 11 may be composed of two parts, left and right, and the specific configuration is arbitrary.

<Cover 2>
6 to 15 show the cover 2. The cover 2 is formed of one member and is formed so as to cover substantially the entirety of the electric tool 1 except for a part of the gripping portion 20. The cover 2 covers the upper gripping portion 23 from above, and a grip. And a cylindrical cover part 34 that covers the outer peripheral surface of the part 24. The cover 2 is made of rubber, preferably silicone rubber, and may be transparent or opaque. The cover 2 is attached to the grip 20 using its own elasticity.

<Top cover part 33>
The upper cover portion 33 has a shape corresponding to the outer surface of the upper grip portion 23, and has a substantially inverted bowl shape as a whole. A switch opening 35 is formed at the front end of the upper cover 33 to expose the ON / OFF switch 16 as shown in FIG. However, the switch opening 35 is optional and may cover the ON / OFF switch 16. A lower opening 36 that opens downward is formed on the lower surface of the upper cover 33. The lower opening 36 is expanded when the upper cover 33 is placed on the upper grip 23 from above. As shown in FIGS. 9 and 14, the opening edge of the lower opening 36 is higher from both ends in the front-rear direction to the center in the front-rear direction so as to be lower at the front end and the rear end and higher at the center in the front-rear direction. It is convexly curved. As shown in FIG. 10, the lower opening 36 has an elliptical shape in which the length in the front-rear direction is slightly larger than the length in the left-right direction. As shown in FIGS. 9 and 10, the upper cover portion 33 has a shape that expands outward at the center in the vertical direction, and gradually decreases inward toward the lower opening portion 36 from there. It has become. As shown in FIGS. 14 and 15A, an annular ridge 38 is provided on the inner peripheral surface of the opening edge of the lower opening 36 so as to project inward.

<Cylinder cover part 34>
The tubular cover portion 34 has a shape corresponding to the outer peripheral surface of the grip portion 24 and is tubular. The tubular cover portion 34 continuously extends from the upper cover portion 33 toward the rear side, and gradually becomes thinner toward the rear side in plan view. A rear opening 39 is formed at the rear end of the cylindrical cover 34 as shown in FIG. The rear opening 39 corresponds to the shape of the step portion 27 of the grip portion 24, and like the step portion 27, the lower half region is in the front-rear direction, that is, in the axial direction of the cylindrical cover portion 34. While the upper half region extends obliquely toward the front. As shown in FIG. 14, in the upper half region of the opening edge of the rear opening 39, an oblique locking portion 41 that extends inward (toward the center) is formed. On the inner peripheral surface of the lower half region of the opening edge portion, a locking ridge 42 protruding inward (center side) is formed along the circumferential direction. As shown in FIGS. 9 and 14, a flange 43 protruding outward is formed on the outer peripheral surface of the lower half region of the opening edge of the rear opening 39 along the circumferential direction. The amount of protrusion of the flange portion 43 is the largest at the lowermost portion, and gradually decreases toward the left and right sides from there, and becomes substantially zero at the center in the vertical direction (left and right sides).

  The cover 2 is formed with a large number of ventilation ports 50 penetrating inward and outward. The ventilation port 50 is formed in a portion corresponding to the portion where the intake port 14 is formed in the grip portion 20 or in the vicinity thereof. Specifically, as shown in FIGS. A large number is formed in the front part, the lower part of the left and right side surfaces, and the lower part of the grip part 24, respectively. It is preferable that the arrangement area of the ventilation port 50 of the cover 2 is larger than the arrangement area of the intake port 14 of the gripper 20, for example, slightly larger. Also, it is possible to minimize the decrease in the amount of inflow of air from the intake port 14. A non-slip protruding ridge 51 is formed on the outer surface of the cover 2. Specifically, as shown in FIG. 8, a plurality of left and right anti-slip ridges 51 are formed in a left-right symmetric arrangement from the left and right side positions on the upper rear portion of the upper cover portion 33 to the upper portion of the grip portion 24. The anti-slip projection 51 extends to the vicinity of the rear opening 39 of the grip portion 24.

  Further, a large number of convex portions 52 and 53 are formed on the inner surface of the cover 2. The projections 52 and 53 are formed mainly on the upper part of the inner surface as shown in FIG. 13, and are formed in a wide range from the upper cover part 33 to the cylindrical cover part 34. The convex portions 52 and 53 are partially formed up to the inner surface side portion as shown in FIG. 14, but are not formed at least in the lower half region. As described above, the convex portions 52 and 53 are formed on the upper surface of the cover 2 while the convex portions 52 and 53 are not formed on the lower portion of the inner surface. Therefore, the upper portion of the cover 2 has relatively high rigidity. It is difficult to expand and contract, and the lower part has relatively low rigidity, making it easy to expand and contract. The types and shapes of the projections 52 and 53 are arbitrary, and may be an independent island shape such as a columnar shape or a prismatic shape. And a plurality of cylindrical ribs 53 extending in two directions and a plurality of cylindrical ribs 53 partially connected to each other on the outer peripheral surface.

  The cylindrical ribs 53 are formed corresponding to the large number of vents 50 formed in the front part of the upper surface of the upper cover part 33. That is, the cylindrical rib 53 is formed at the opening edge of the ventilation hole 50 on the inner surface of the cover 2, and the cylindrical rib 53 protrudes from the inner surface of the cover 2 to cover the entire periphery of the opening edge. A locally thick portion is formed in an annular shape. The adjacent cylindrical ribs 53 are connected to each other in a part of the entire circumference thereof and are continuous. The entire formation area of the ventilation holes 50 of the cover 2 is not uniformly thick, but only the opening edges of the individual ventilation holes 50 are locally thickened by the cylindrical ribs 53. A relatively thin recess is formed between them. That is, the cylindrical ribs 53 are convex, and a portion between the cylindrical ribs 53 is concave, so that an uneven shape is formed on the inner surface of the cover 2.

  By forming the annular cylindrical rib 53 at the opening edge of the ventilation port 50 on the inner surface of the cover 2 in this manner, the thickness around the ventilation port 50 locally increases toward the inner surface side. It will be reinforced as a part. Therefore, it is possible to prevent the cover 2 from being torn from the vent 50. Further, by providing the cylindrical rib 53 on the inner surface of the cover 2, when the cover 2 is attached to the power tool 1, the cover 2 is prevented from being unnecessarily elongated. Therefore, the cover 2 can be accurately attached to a predetermined position, and in particular, the displacement of the ventilation port 50 of the cover 2 with respect to the intake port 14 of the power tool 1 can be suppressed. Further, the opening edge of the ventilation hole 50 on the inner surface of the cover 2 is locally thicker than the surrounding portion due to the cylindrical rib 53, and the inner surface of the cover 2 has an uneven shape. It is difficult for the vibration of the hand to be transmitted to the hand, making work easier.

  FIG. 15A is a cross-sectional view of the upper cover 33 cut along a cutting plane along the vertical and horizontal directions. One end of the inner surface of the upper cover 33 (for example, the lower opening 36) is shown in FIG. The circumference from the left end of the opening edge to the other end (for example, the right end of the opening edge of the lower opening 36) is shorter than the circumference of the covering area on the outer surface at the position of the upper gripping portion 23 corresponding thereto. Similarly, FIG. 15B is a cross-sectional view of the cylindrical cover portion 34 cut along a cutting plane along the vertical and horizontal directions. The circumferential length of the inner peripheral surface of the cylindrical cover portion 34 is as follows. Is shorter than the peripheral length of the outer peripheral surface at the position of the grip portion 24 corresponding to this. Therefore, the cover 2 is attached to the grip 20 in an extended state, and the inner surface of the cover 2 is in close contact with the outer surface of the grip 20. When the cover 2 is attached to the power tool 1, the elongation percentage of the cylindrical cover part 34 is larger than the elongation percentage of the upper cover part 33. That is, the cylindrical cover portion 34 is attached in a state where it is relatively larger than the upper cover portion 33. Therefore, in the mounted state, the close contact force or the tightening force of the cover 2 is larger in the tubular cover portion 34 than in the upper cover portion 33.

  The procedure for attaching the cover 2 configured as described above to the electric tool 1 is, for example, as follows. That is, as shown in FIG. 21, the power cord 17 of the power tool 1 is passed through the cover 2 from the plug side at the tip end. Specifically, the power cord 17 is passed from the lower opening 36 of the cover 2 to the rear opening 39, and the cover 2 is guided from the distal end to the proximal end of the power cord 17. Then, the cover 2 is put on the grip 20 of the electric power tool 1 such that the grip 24 is inserted into the lower opening 36 of the cover 2 as it is. First, the cylindrical cover 34 is put on the grip 24. Next, in a state where the tubular cover portion 34 is fitted to the grip portion 24, the upper cover portion 33 is put on the upper grip portion 23 while pulling the cover 2 forward to expand the lower opening portion 36. On the other hand, when removing the cover 2 from the power tool 1, the procedure may be performed in the reverse order to the above. That is, the upper cover 33 is detached from the upper grip 23 by pulling up the front part of the cover 2, and then the tubular cover 34 is removed from the grip 24 by pulling it back. Then, the cover 2 may be removed from the plug side of the power cord 17.

  As described above, by utilizing the elasticity of the rubber cover 2, the cover 2 can be easily attached to and detached from the grip portion 20 of the electric tool 1. Therefore, for example, when the cover 2 is deteriorated or becomes dirty due to long-term use, the old cover 2 may be removed from the power tool 1 and a new cover 2 may be attached to the power tool 1.

  The power cord 17 extends from the rear end of the grip portion 24, and the cover 2 can be attached via the power cord 17, so that the power cord 17 can be used as a guide for attachment, and Can be easily attached from the grip portion 24 of the power tool 1. Further, since the grip portion 24 is gradually thickened toward the front side, the tubular cover portion 34 can be smoothly covered on the grip portion 24 even if the cover 2 is made of rubber. Then, after the cylindrical cover portion 34 is put on the grip portion 24, the upper cover portion 33 is pulled to cover the upper grip portion 23 while expanding the lower opening portion 36. Therefore, the cover 2 can be easily attached in the extended state, and the cover 2 can be securely and easily brought into close contact with the grip portion 20. For example, it is possible to cover the power tool 1 with the left hand while pressing the power tool 1 while extending the cover 2 toward the front side of the power tool 1 with the right hand. Also, since the front portion of the upper grip portion 23 projects forward with respect to the body portion 21, the upper cover portion 33 is hooked on the front portion of the upper grip portion 23 projecting forward from the body portion 21, The cover 2 can be attached to the grip 20.

  FIGS. 16 to 20 show a state in which the cover 2 is attached to the power tool 1. As shown in FIGS. 16 to 18, the cover 2 covers substantially the entire grip 20. Although the ON / OFF switch 16 and its peripheral portion, and the rear end portion of the grip portion 24, particularly the upper portion of the rear end portion, of the grip portion 20 are not covered with the cover 2, the other portions are entirely covered with the cover 2. Covered with. The opening edge of the lower opening 36 of the cover 2 is located at or near the upper end of the body 21 or the lower end of the grip 20.

  Since the annular ridge 38 is formed on the inner peripheral surface of the lower opening 36 of the cover 2, the opening edge of the lower opening 36 of the cover 2 is locally thickened, and The opening edge portion is not easily torn, and the opening edge portion of the lower opening portion 36 of the cover 2 is firmly adhered to the lower end portion of the grip portion 20 or the upper end portion of the body portion 21, thereby preventing the cover 2 from shifting. . In addition, as shown in FIG. 19, a constricted portion 25 is formed on each of the right and left sides at the boundary between the body portion 21 and the gripping portion 20, and the annular ridge 38 of the cover 2 bites into the constricted portion 25. Due to the close contact, the cover 2 is more difficult to be displaced, and can be stably gripped.

  Further, as shown in FIG. 20, the grip portion 24 is covered with the cylindrical cover portion 34 over the entire circumference. During operation, the grip portion 24 is mainly gripped strongly. However, since the grip portion 24 is covered with the cylindrical cover portion 34 over the entire circumference, the grip portion 24 is firmly held via the cylindrical cover portion 34. Can be held. Further, since the tubular cover portion 34 has a higher elongation when attached than the upper cover portion 33, a higher adhesiveness can be obtained with the tubular cover portion 34 than with the upper cover portion 33. Therefore, even if the grip portion 24 is strongly gripped, the cylindrical cover portion 34 is unlikely to be shifted with respect to the grip portion 24.

  Further, as shown in FIG. 18, in the mounted state, the stepped portion 27 of the grip portion 24 and the oblique locking portion 41 on the inner peripheral surface of the rear opening 39 of the cylindrical cover portion 34 and the locking ridge. 42 is locked. Therefore, displacement of the cylindrical cover portion 34 toward the front side with respect to the grip portion 24 is reliably prevented. In particular, when the cover 2 is mounted, the cover 2 is pulled to the front side with the cylindrical cover portion 34 covering the grip portion 24. At this time, the oblique locking portion 41 and the locking ridge 42 of the cover 2 are gripped. Since the cover 2 is hooked on the step portion 27 of the portion 24, the cover 2 can be easily extended to the front side, and the upper cover portion 33 can be put on the upper grip portion 23.

  Then, by attaching the rubber cover 2 to the grip portion 20, the grip portion 20 can be firmly gripped even when the electric tool 1 vibrates in the polishing operation. Since the power tool 1 of the present embodiment is for one hand, the work can be performed, for example, by gripping the upper grip 23 from the grip 24 with the right hand, which is one hand. At this time, the user can further work by pressing the upper surface of the upper grip portion 23 with the left hand, which is the other hand. In any case, since the rubber cover 2 is attached to the grip portion 20, the polishing operation can be performed while firmly pressing the electric tool 1.

  Since the gripper 20 of the power tool 1 is provided with a large number of intake ports 14, the surface thereof has many irregularities. The housing 11 is made of a hard synthetic resin. Therefore, when the gripping portion 20 of the electric tool 1 is directly gripped, it is slippery, and it is difficult to grip due to the unevenness of the surface. On the other hand, when the rubber cover 2 is attached, the unevenness of the grip portion 20 of the power tool 1 is covered by the rubber cover 2 and the grip can be held without being affected by the unevenness. . Moreover, since the cover 2 is made of rubber, the cover 2 is not slippery and can be firmly gripped. Further, since the cover 2 is made of rubber, the vibration of the power tool 1 is hardly transmitted to the hand, and the tire is hardly tired. In addition, since the anti-slip ridges 51 are formed on the outer surface of the cover 2, the slip is further reduced.

  On the other hand, since the ventilation hole 50 is formed in the cover 2 corresponding to the intake port 14 of the grip portion 20, the inflow of air into the housing 11 is maintained even when the cover 2 is mounted. In addition, there is an advantage that the cover 2 is hardly torn by making the vent 50 round. Further, since the ON / OFF switch 16 is exposed without being covered by the cover 2, the position and the existence of the ON / OFF switch 16 can be easily grasped, and the ON / OFF switch 16 is directly pressed. be able to.

  Further, since a large number of projections 52, 53 are formed on the inner surface of the cover 2, a space is formed between the projections 52, 53 and the projections 52, 53, and the space makes it difficult for the vibration to be transmitted to the hand. , Less tired. In particular, since the protrusions 52 and 53 are mainly formed on the inner surface of the upper portion of the cover 2, the vibration when the power tool 1 is pressed from above to perform the polishing operation is not easily transmitted to the hand. On the other hand, since the projections 52 and 53 are not formed in the lower half area of the inner surface of the cover 2, the elasticity of the lower half area of the cover 2 does not decrease, and therefore, the cover 2 can be easily expanded and contracted to be detached. . In addition, since the protruding portions 52 and 53 are continuous in a rib shape such as the protruding rib 52 and the cylindrical rib 53, the rigidity of the upper portion of the cover 2 is higher than that of the independent island shape, and the rubber is made of rubber. However, a stable operation feeling can be obtained.

  Since the flange 43 is formed below the rear end of the cylindrical cover 34, a finger can be hooked on the flange 43. For example, when carrying the power tool 1, the user can easily carry the power tool 1 by hooking a finger on the flange 43. It is also possible to turn the cover 2 upside down and use it as a so-called reversible.

  In the present embodiment, the power cord 17 extends from the end of the grip 24, but the power cord 17 may extend from a location different from the grip 24. In this case, it is not necessary to pass the power cord 17 through the cover 2, and the tubular cover 34 may be fitted directly to the grip 24. Alternatively, a battery type without the power cord 17 may be used.

  Furthermore, the configuration of the gripping portion 20 can be variously changed, and may be a configuration without the grip portion 24. For example, in a configuration in which a rod-shaped extending portion that is not the gripping portion 20 extends outward, A configuration may be employed in which a portion to be inserted, which is a part of the cover 2, is hooked on the portion, and the cover 2 is stretched in this state and put on the upper grip portion 23. The inserted portion may have a cylindrical shape that covers the extending portion, or may have an annular shape.

1 power tool (tool body)
2 Cover 10 Motor 11 Housing 11a Lower housing 11b Upper housing 12 Polishing plate 13 Main shaft 14 Inlet port 15 Exhaust port 16 ON / OFF switch 17 Power cord 18 Cord holder 20 Gripping section 21 Body section 22 Skirt section 23 Upper grasping section 24 Grip section 25 constricted part 26 opening part 27 step part 33 upper cover part 34 cylindrical cover part 35 switch opening part 36 lower opening part 38 ridge 39 rear opening part 41 oblique locking part 42 locking ridge 43 flange part 50 ventilation Mouth 51 Non-slip protruding ridge 52 Protruding ridge (convex portion)
53 Cylindrical rib (convex)

Claims (5)

Equipped with a rubber cover that is detachably attached to the grip of the tool body by elasticity ,
The tool body includes an upper grip portion as a grip portion having an upper surface against which a hand is pressed from above, and an extending portion extending outward.
The cover includes an upper cover portion that covers the upper grip portion of the tool main body from above, and an inserted portion through which the extended portion of the tool main body is inserted. A power tool, wherein the power tool is mounted on the tool body such that the portion is put on an upper grip portion of the tool body . The extending portion is a grip portion that constitutes a part of the grip portion, and the upper grip portion has a shape that protrudes outward in a flange shape,
The inserted portion of the cover is a cylindrical tubular cover portion that covers the outer peripheral surface of the grip portion of the tool body,
The top cover portion of the cover, the power tool of claim 1, wherein mounted on the upper grip portion so as to expand the opening have an opening which opens downward. Power cord from the grip portion extend is, an end of the cylindrical cover portion opening is formed, the cover of claim 2, wherein the detachable so as to pass through the power cord to the cylindrical cover portion Electric tool. The power tool according to claim 2 or 3, wherein the elongation of the cylindrical cover portion when attached to the tool body is greater than the elongation of the upper cover portion. An intake port is formed in the grip portion of the tool body, and a vent is formed in the cover so as to correspond to the intake port. The power tool according to any one of claims 1 to 4 , wherein the projection is formed.

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