JP2017104949A - Electric tool and cover for electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool which maintains an antislip effect of a holding part over a long term, and to provide a cover of the electric tool.SOLUTION: An electric tool includes a rubber cover 2 detachably attached to a holding part 20 of a tool body 1 by its elasticity. The tool body 1 includes: an upper holding part 23 having an upper surface to which a hand is pressed from above; and a grip part 24 extending outward. A power cord 17 extends from the grip part 24. The cover 2 includes: an upper cover part 33 covering the upper holding part 23 of the tool body 1 from above; and a cylindrical cover part 34 covering an outer peripheral surface of the grip part 24 of the tool body 1. The cover 2 is detachably attached to the cylindrical cover part 34 so that the power cord 17 passes therethrough.SELECTED DRAWING: Figure 18

Description

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

  For example, when a polishing operation is performed using an electric sander, the gripping portion of the electric sander is firmly held or pressed by hand. In order to prevent slipping at that time, an anti-slip layer may be provided on the surface of the grip portion of the electric sander. In the following Patent Document 1, an elastic layer made of an elastomer is provided on the grip portion by heat welding. However, since the elastic layer gradually deteriorates over time, the anti-slip effect also gradually decreases. In addition, the heat-welded elastic layer may peel off due to long-term use.

JP 2005-279891 A

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an electric power tool capable of maintaining the anti-slip effect of the gripping portion over a long period of time and a cover thereof.

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

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

  In particular, the tool body includes an upper grip part as a grip part having an upper surface for pressing the hand from above and an extending part extending outward, and the cover covers the upper grip part of the tool body from above. And a tool body in such a manner that the upper cover portion is placed on the upper gripping portion of the tool body in a state where the insertion portion is inserted through the extension portion of the tool body. It is preferable to be attached to the tool body, and it can be easily attached to the tool body by taking advantage of the elasticity of the cover.

  Furthermore, the extending part is a grip part that constitutes a part of the grip part, the upper grip part has a shape protruding in a bowl shape toward the outside, and the inserted part of the cover is the outer peripheral surface of the grip part of the tool body It is preferable that the upper cover portion of the cover has an opening portion opened on the lower side and is attached to the upper grip portion so as to expand the opening portion, High adhesion of the cover can be obtained.

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

  Moreover, it is preferable that the elongation rate of the cylindrical cover part when attached to a tool main body is larger than the elongation rate of an upper cover part. (Elongation rate) = (Difference in circumference) / (Perimeter of outer peripheral surface of tool main body), (Difference in peripheral length) = (Perimeter of outer peripheral surface of tool main body) − (Inner circumference of cover) Perimeter of the surface). The difference in the 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 circumferential surface of the cylindrical cover portion in the cylindrical cover portion. This is the difference between the circumferential length of the outer surface of the upper gripping portion of the tool body and the circumferential length of the inner surface of the upper cover portion in a cross-sectional view cut by a cutting plane in the direction. Here, the peripheral length of the inner peripheral surface of the cylindrical 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 the natural state of the cover. In the cylindrical cover portion, the elongation ratio is the difference between the peripheral length of the outer peripheral surface of the grip portion of the tool body and the peripheral length of the inner peripheral surface of the cylindrical cover portion. In the upper cover part, in the cross-sectional view cut by the cut surface in the vertical direction, the peripheral length of the outer surface of the upper grip part of the tool body, and the peripheral length of the inner surface of the upper cover part Is divided by the circumference of the outer surface of the upper gripping portion of the tool body. Thus, by making the elongation rate of the cylindrical cover portion larger than the elongation rate of the upper cover portion, the cylindrical cover portion is more closely attached to the tool body than the upper cover portion. Therefore, the cylindrical cover portion can be more firmly attached to the grip portion that requires a high anti-slip effect.

  In addition, an air inlet is formed in the grip portion of the tool body, and a vent is formed in the cover so as to correspond to the air inlet. It is preferable that the convex part is formed over. A convex part is formed over the entire periphery of the opening edge at the opening edge of the vent on the inner surface side of the cover, that is, the back side of the cover, so that the area around the vent is locally thick. To be reinforced. Therefore, the cover can be prevented from being broken starting from the opening edge of the vent. In addition, by providing a convex portion on the opening edge of the vent on the inner surface side of the cover, excessive extension of the cover can be prevented, and the cover can be accurately attached at a predetermined position, with respect to the air intake of the tool body. The positional deviation of the vent of the cover can be suppressed. In addition, the opening edge of the vent on the inner surface of the cover is locally thicker than the other parts due to the convex portion, and the inner surface of the cover is uneven, making it difficult for the vibration of the tool body to be transmitted to the hand. The work becomes easier.

  Moreover, the cover for electric tools which concerns on this invention is a thing of the rubber | gum attached to the holding part of an electric tool detachably by elasticity.

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

The perspective view which shows the electric tool (tool main body) in one Embodiment of this invention. The top view which looked at the same electric tool from the upper side. The figure which looked at the same electric 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 electric tool from the rear side. The perspective view which looked at the cover with which the electric tool is mounted | worn from the plane side. The perspective view which looked at the same cover from the lower side. The top view which looked at the cover from the upper side. The figure which looked at the 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 rear side. AA sectional drawing of FIG. BB sectional drawing of FIG. (A) is CC sectional drawing of FIG. 8, (b) is DD sectional drawing of FIG. The top view seen from the upper side which shows the state which mounted | wore the same electric tool with the cover. The figure seen from the side surface which shows the state which mounted | wore the same electric tool with the cover. EE sectional drawing of FIG. FF sectional drawing of FIG. GG sectional drawing of FIG. The figure seen from the side surface which shows the state in the middle of mounting | wearing with the same electric tool.

  Hereinafter, an electric power tool 1 (tool main body) and a cover 2 attached thereto according to an embodiment of the present invention will be described with reference to FIGS. Although the electric tool 1 may be various, this embodiment illustrates an electric sander. There are various types of electric sanders, and various sanders such as an orbital sander, a random sander, a belt sander, and a disk sander may be used. In this embodiment, an orbital sander is exemplified. In particular, the polishing portion is exemplified as a rectangular shape, but may be triangular. Moreover, although the electric sander hold | gripped with both hands may be sufficient, in this embodiment, the type hold | gripped with one hand especially, what is called a palm sander is illustrated.

<Electric tool 1 (tool body)>
First, the power tool 1 (tool 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 accommodated in the housing 11 such 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 through 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 the present embodiment, the polishing plate 12 has a horizontally long rectangular shape that is slightly longer in the left-right direction. However, the polishing plate 12 may have a vertically long rectangular shape that is long in the front-rear direction or a square shape.

<Housing 11>
The housing 11 is formed in a cylindrical shape as a whole of the upper end closing and the lower end opening, 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 barrel portion 21 as a middle portion, a grip portion 20 as an upper portion located above the barrel portion 21, and a lower portion located below the barrel portion 21. And a skirt portion 22. The trunk | drum 21 is substantially cylindrical shape. The skirt portion 22 is larger than the trunk portion 21, extends from the lower end portion of the trunk portion 21 while gradually expanding downward, and then extends vertically further downward therefrom. The skirt portion 22 is equally large with respect to the trunk portion 21 in both the front-rear direction and the left-right direction. The skirt portion 22 is rectangular in a plan view or a bottom view according to the shape of the polishing plate 12, and is a square shape in this embodiment. As shown in FIG. 2, the polishing plate 12 is larger than the lower end portion of the skirt portion 22 in plan view, and is longer in both the front-rear dimension and the left-right dimension. Note that the grip portion 20 is formed with an intake port 14 for taking air into the housing 11, and specifically, intake air is provided on the upper surface, left and right side surfaces of the upper grip portion 23, and the lower surface of the grip portion 24, which will be described later. A mouth 14 is formed. In addition, exhaust ports 15 for exhausting air in the housing 11 are formed in the lower portion of the skirt portion 22, specifically, on both the 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 motor 10 is cooled by the flow of air in the housing 11.

<Grip part 20>
The grip 20 has a shape that protrudes 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 whose hand is pressed against the upper surface during work, and extends from the upper grip portion 23 toward the rear side during work. It is comprised from the grip part 24 grasped.

<Upper gripping part 23>
The upper gripping portion 23 has a shape that protrudes outwardly from the upper end portion of the body portion 21 except for the rear portion, that is, on the front side and the left and right sides. Specifically, as shown in FIG. 3, the front portion of the upper gripping portion 23 projects forward from the trunk portion 21. Further, as shown in FIGS. 4 and 5, the left and right side portions of the upper grip portion 23 protrude from the body portion 21 to the left and right sides, respectively. However, the amount of protrusion from the body portion 21 at the front portion of the upper grip portion 23 is larger than the amount of protrusion from the body portion 21 at the left and right side portions of the upper grip portion 23, and the body portions at the left and right side portions of the upper grip portion 23. The protruding amounts 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. A constricted portion 25 that is recessed inward is formed at the boundary between the left and right side portions of the upper grip portion 23 and the body portion 21.

  Further, as shown in FIGS. 4, 5, and 19, the upper surface of the upper grip portion 23 is curved upwardly in a sectional view cut along a cut surface along the vertical direction and the horizontal direction. The upper half-elliptical shape has a long axis in the left-right direction and a short axis in the up-down direction, and a semi-oval shape long in the left-right direction. Further, as shown in FIGS. 3 and 18, the upper surface of the upper gripping portion 23 is slightly from the rear portion to the front portion in a sectional view cut along a cut surface along the vertical direction and the front-rear direction passing through the rotation center of the motor 10. And it is descending slowly. An opening 26 that opens to the front side is formed at the front end of the grip 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 left and right seesaw type. Accordingly, the opening 26 has a correspondingly long shape in the left-right direction.

<Grip part 24>
The grip part 24 extends continuously from the rear part of the upper grip part 23 toward the rear side. The grip portion 24 has a cylindrical shape having an axis in the front-rear direction, and the internal space thereof is integral with that of the upper grip portion 23 and the rear end is open. As shown in FIGS. 3 and 18, the grip portion 24 extends horizontally toward the rear side. As shown in FIG. 2, the grip portion 24 is gradually narrowed in the left-right direction dimension (width) in the plan view. That is, the width of the grip part 24 becomes narrower as it gets away from the upper grip part 23 and becomes wider as it gets closer to the upper grip part 23. Further, as shown in FIG. 3, the upper portion of the outer peripheral surface of the grip portion 24 continuously and smoothly extends from the upper surface of the upper grip portion 23 without any step, and slightly descends from the front portion to the rear portion of the upper portion of the outer peripheral surface. doing. A step portion 27 is formed over the entire circumference at the rear portion of the grip portion 24, and the portion on the rear side of the step portion 27 is thinner than the front portion. The lower half region of the stepped portion 27 is perpendicular to the front-rear direction, that is, perpendicular to the axial direction of the grip portion 24, whereas the upper half region of the stepped portion 27 extends obliquely toward the front side. .

  A power cord 17 is inserted inside the grip portion 24, and the power cord 17 extends rearward from the rear end portion of the grip portion 24. Specifically, as shown in FIG. 18, the front portion of the tubular cord holder 18 is fitted inside the rear portion of the grip portion 24, and the power cord 17 passes through the inside of the cord holder 18. 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 upper and lower parts, and includes a lower housing 11a that is open at both upper and lower ends, and an upper housing 11b that closes an upper end opening of the lower housing 11a. The lower housing 11a constitutes the lower part (lower half area) of the grip part 20, the body part 21, and the skirt part 22, and the upper housing 11b constitutes the upper part (upper half area) of the grip part 20. . However, the housing 11 may be composed of two parts on the left and right, and the specific configuration is arbitrary.

<Cover 2>
The cover 2 is shown in FIGS. The cover 2 is formed of a single member and is formed so as to cover substantially the entire portion except for a part of the grip portion 20 of the electric power tool 1, and includes an upper cover portion 33 that covers the upper grip portion 23 from above, and a grip. It consists of a cylindrical cover part 34 that covers the outer peripheral surface of the part 24. The cover 2 is made of rubber, preferably made of silicon rubber, and may be transparent or opaque. The cover 2 is attached to the grip 20 using its own stretchability.

<Upper 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 generally inverted saddle 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 arbitrary 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 portion 33. The lower opening 36 is widened 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 located at the upper side from the front and rear ends to the front and rear direction center so that it is lower at the front end and rear end and higher at the front and rear center. It is convexly curved. Further, 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. 9 and 10, the upper cover portion 33 has a shape that expands to the outermost side in the central portion in the vertical direction, and has a shape that gradually decreases inward from there toward the lower opening 36. It has become. Moreover, as shown in FIG.14 and FIG.15 (a), the cyclic | annular protrusion 38 is protrudingly provided by the inner peripheral surface of the opening edge part of the lower opening part 36 toward the inner side.

<Cylindrical cover part 34>
The cylindrical cover portion 34 has a shape corresponding to the outer peripheral surface of the grip portion 24 and has a cylindrical shape. The cylindrical 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 portion 34 as shown in FIG. The rear opening 39 corresponds to the shape of the stepped portion 27 of the grip portion 24, and similarly to the stepped portion 27, the lower half region thereof is in the front-rear direction, that is, in the axial direction of the cylindrical cover portion 34. In contrast, the upper half region extends obliquely toward the front side. As shown in FIG. 14, in the upper half region of the opening edge portion of the rear opening 39, a slanted locking portion 41 that is inclined and extends toward the inner side (center side) is formed. On the inner peripheral surface of the lower half region of the opening edge, a locking ridge 42 projecting inward (center side) is formed along the circumferential direction. Further, as shown in FIGS. 9 and 14, a flange 43 protruding outward is formed along the circumferential direction on the outer peripheral surface of the lower half region of the opening edge of the rear opening 39. In addition, the protrusion amount of the collar part 43 is the largest at the lowermost part, gradually decreases toward the left and right sides from there, and is substantially zero at the vertical center part (the left and right side parts).

  The cover 2 is formed with a large number of vent holes 50 penetrating in the inner and outer directions. The vent 50 is formed at a portion corresponding to the portion where the inlet 14 is formed in the grip portion 20 or the vicinity thereof. Specifically, as shown in FIGS. Many are formed in the front part of the surface, the left and right side lower parts, and the lower part of the grip part 24, respectively. It is preferable to make the arrangement area of the vent 50 of the cover 2 larger than the arrangement area of the intake port 14 of the grip portion 20, for example, one time larger, and the mounting position of the cover 2 is deviated from the design position. In addition, a decrease in the amount of air inflow from the intake port 14 can be minimized. Further, an anti-slip ridge 51 is formed on the outer surface of the cover 2. Specifically, as shown in FIG. 8, a plurality of anti-slip ridges 51 are formed symmetrically 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 ridge 51 extends to the vicinity of the rear opening 39 of the grip portion 24.

  Furthermore, a large number of convex portions 52 and 53 are formed on the inner surface of the cover 2. The convex portions 52 and 53 are mainly formed at the upper part of the inner surface as shown in FIG. 13, and are formed in a wide range from the upper cover portion 33 to the cylindrical cover portion 34. In addition, although the convex parts 52 and 53 are partially formed to the inner surface side part as shown in FIG. 14, they are not formed at least in the lower half area. As described above, the convex portions 52 and 53 are formed on the inner upper surface of the cover 2, while the convex portions 52 and 53 are not formed on the lower inner surface, so that the upper portion of the cover 2 has relatively high rigidity. It is difficult to expand and contract, and the lower part is relatively low in rigidity and easily expands and contracts. The type and shape of the projections 52 and 53 are arbitrary and may be independent islands such as a columnar shape or a prismatic shape, but in this embodiment, they are inclined 45 degrees to the left and right with respect to the front-rear direction. Thus, two extending ridge ribs 52 and a large number of cylindrical ribs 53 partially connected to each other on the outer peripheral surface are formed.

  The cylindrical rib 53 is formed to correspond to a large number of vent holes 50 formed in the upper surface front portion of the upper cover portion 33. That is, the cylindrical rib 53 is formed at the opening edge of the vent 50 on the inner surface of the cover 2, and the cylindrical rib 53 protrudes from the inner surface of the cover 2 so that the entire circumference of the opening edge is formed. A local thick part will be formed in an annular shape. Adjacent cylindrical ribs 53 are continuous and connected at a part of the entire circumference. The entire formation region of the vent 50 of the cover 2 is not uniformly thick, but only the opening edge of each vent 50 is locally thickened by the cylindrical ribs 53, and the cylindrical ribs 53 are A relatively thin recess is formed between the two. That is, the cylindrical rib 53 is convex and the portion between the cylindrical ribs 53 is concave, so that an uneven shape is formed on the inner surface of the cover 2.

  In this way, by forming the annular cylindrical rib 53 at the opening edge of the vent 50 on the inner surface of the cover 2, the thickness around the vent 50 is locally increased toward the inner surface. Will be reinforced. Therefore, the cover 2 can be prevented from being broken from the vent 50. Further, by providing the cylindrical rib 53 on the inner surface of the cover 2, it is possible to prevent the cover 2 from extending more than necessary when the cover 2 is attached to the electric tool 1. Therefore, the cover 2 can be accurately attached to a predetermined position, and in particular, the positional deviation of the vent 50 of the cover 2 with respect to the intake port 14 of the electric tool 1 can be suppressed. Furthermore, the opening edge of the vent 50 is locally thicker than the surrounding portion of the inner surface of the cover 2 due to the cylindrical rib 53, and the inner surface of the cover 2 has an uneven shape. This makes it easier to transmit vibrations to the hand.

  FIG. 15A shows a cross-sectional view of the upper cover 33 cut along a cut surface along the vertical and horizontal directions. One end of the inner surface of the upper cover 33 (for example, the lower opening 36). The circumference from the left edge of the opening edge to the other end (for example, the right edge of the opening edge of the lower opening 36) is shorter than the circumference of the covering region on the outer surface at the position of the upper grip 23 corresponding thereto. Similarly, FIG. 15B shows a cross-sectional view of the cylindrical cover portion 34 cut along a cut surface along the vertical direction and the horizontal direction. The circumferential length of the inner peripheral surface of the cylindrical cover portion 34 is as follows. The circumference of the outer peripheral surface at the position of the grip portion 24 corresponding thereto is shorter. Accordingly, the cover 2 is attached to the grip portion 20 in an extended state, and the inner surface of the cover 2 is in close contact with the outer surface of the grip portion 20. When the cover 2 is attached to the electric power tool 1, the elongation rate of the cylindrical cover portion 34 is larger than the elongation rate of the upper cover portion 33. That is, the cylindrical cover portion 34 is attached in a state where it is extended relatively larger than the upper cover portion 33. For this reason, in the mounted state, the cylindrical cover portion 34 has a greater contact force or tightening force of the cover 2 than 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 electric power tool 1 is passed through the cover 2 from the plug side at the tip. 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 side to the proximal end side of the power cord 17. Then, the cover 2 is put on the grip 20 of the electric tool 1 so that the grip 24 is inserted into the lower opening 36 of the cover 2 as it is. First, the cylindrical cover part 34 is put on the grip part 24. Next, in a state where the cylindrical cover part 34 is fitted to the grip part 24, the upper cover part 33 is covered with the upper grip part 23 while pulling the cover 2 forward to expand the lower opening 36. On the other hand, when removing the cover 2 from the electric tool 1, the procedure may be reversed. That is, the upper cover portion 33 is removed from the upper grip portion 23 so that the front portion of the cover 2 is pulled upward, and then the cylindrical cover portion 34 is removed from the grip portion 24 so as to be pulled rearward. Then, the cover 2 may be removed from the plug side of the power cord 17.

  Thus, by utilizing the stretchability of the rubber cover 2, the cover 2 can be easily attached to or removed from the grip 20 of the electric power tool 1. Therefore, for example, when the cover 2 deteriorates or becomes dirty due to long-term use, the old cover 2 may be removed from the electric tool 1 and a new cover 2 may be attached to the electric tool 1.

  Since the power cord 17 extends from the rear end portion of the grip portion 24 and the cover 2 can be attached via the power cord 17, the power cord 17 can be used as a guide at the time of attachment. Can be easily attached from the grip portion 24 of the electric power tool 1. Moreover, since the grip part 24 is gradually thickened toward the front side, the cylindrical cover part 34 can be smoothly covered on the grip part 24 even if the cover 2 is made of rubber. Then, the cylindrical cover portion 34 can be put on the grip portion 24, and the upper cover portion 33 can be put on the upper grip portion 23 while the lower opening portion 36 is expanded by pulling the upper cover portion 33. Accordingly, the cover 2 can be easily attached in an extended state, and the cover 2 can be securely and easily adhered to the grip portion 20. For example, the cover 2 can be covered while being stretched toward the front side of the power tool 1 with the right hand while holding the power tool 1 with the left hand. Moreover, since the front part of the upper grip part 23 protrudes forward with respect to the trunk part 21, the upper cover part 33 is hooked on the front part of the upper grip part 23 protruding forward from the trunk part 21, The cover 2 can be attached to the grip 20.

  The state where the cover 2 is attached to the electric tool 1 is shown in FIGS. As shown in FIGS. 16 to 18, the cover 2 covers substantially the entire gripping portion 20. Of the grip part 20, the ON / OFF switch 16 and its peripheral part, and the rear end part of the grip part 24, particularly the upper part of the rear end part, are not covered with the cover 2, but the other part is entirely covered with the cover 2. Covered with. Further, the opening edge of the lower opening 36 of the cover 2 is located at the upper end of the body 21, the lower end of the grip 20, or the vicinity thereof.

  And since the annular protrusion 38 is formed in the internal peripheral surface of the lower opening part 36 of the cover 2, the opening edge part of the lower opening part 36 of the cover 2 becomes thick locally, and the lower opening part 36 of The opening edge is not easily torn, and the opening edge of the lower opening 36 of the cover 2 is firmly attached to the lower end of the grip 20 or the upper end of the body 21 to prevent the cover 2 from shifting. . Moreover, as shown in FIG. 19, constricted portions 25 are formed on the left and right sides at the boundary between the body portion 21 and the gripping portion 20 so that the annular protrusion 38 of the cover 2 bites into the constricted portions 25. Since they are in close contact, the cover 2 is less likely to be displaced and can be gripped stably.

  Further, as shown in FIG. 20, the grip portion 24 is covered with the cylindrical cover portion 34 over the entire circumference thereof. During the work, the grip portion 24 is mainly strongly gripped. However, since the grip portion 24 is covered with the cylindrical cover portion 34 over the entire circumference, the grip portion 24 is firmly attached via the cylindrical cover portion 34. You can hold it. In addition, since the cylindrical cover portion 34 has a higher elongation rate than the upper cover portion 33 when attached, the cylindrical cover portion 34 has higher adhesion than the upper cover portion 33. Therefore, even if the grip portion 24 is strongly gripped, the cylindrical cover portion 34 is not easily displaced with respect to the grip portion 24.

  Furthermore, as shown in FIG. 18, in the mounted state, the stepped portion 27 of the grip portion 24 and the oblique locking portion 41 and the locking protrusion on the inner peripheral surface of the rear opening 39 of the cylindrical cover portion 34 are provided. 42 is locked. Therefore, the 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 attached, the cover 2 is pulled to the front side with the cylindrical cover portion 34 placed on the grip portion 24. At this time, the oblique locking portion 41 and the locking protrusion 42 of the cover 2 are gripped. Since it is caught by the step part 27 of the part 24, the cover 2 can be easily extended to the front side, and the upper cover part 33 can be covered with the upper grip part 23.

  Then, by attaching the rubber cover 2 to the grip 20, the grip 20 can be firmly gripped even if the electric tool 1 vibrates during the polishing operation. Since the electric power tool 1 according to the present embodiment is for one hand, for example, the right gripper that is one hand can be operated so that the upper gripping part 23 is gripped from the upper side from the grip part 24. At that time, it is also possible to work by pressing the upper surface of the upper gripping portion 23 with the left hand which is the other hand. In any case, since the rubber cover 2 is attached to the grip 20, the polishing operation can be performed while firmly holding the power tool 1.

  Since the grip portion 20 of the power tool 1 is provided with a large number of air inlets 14, the surface thereof has many irregularities. The housing 11 is made of a hard synthetic resin. Therefore, when the grip portion 20 of the electric power tool 1 is directly gripped, it is slippery and difficult to grip due to surface irregularities. On the other hand, when the rubber cover 2 is attached, the unevenness of the grip 20 of the electric power tool 1 is covered with the rubber cover 2 and can be gripped without being affected by the unevenness. . Moreover, since the cover 2 is made of rubber, it is difficult to slip and can be gripped firmly. In addition, since the cover 2 is made of rubber, the vibration of the electric power tool 1 is not easily transmitted to the hand and is less likely to get tired. In addition, since the protrusion 51 for slip prevention is formed in the outer surface of the cover 2, it is much more difficult to slip.

  On the other hand, since the vent 2 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 attached. In addition, there exists an advantage that the cover 2 is hard to tear by making the vent hole 50 into a round shape. Further, since the ON / OFF switch 16 is exposed without being covered with the cover 2, the position and presence of the ON / OFF switch 16 can be easily grasped, and the ON / OFF switch 16 is directly pressed. be able to.

  In addition, since a large number of convex portions 52 and 53 are formed on the inner surface of the cover 2, a space is generated between the convex portions 52 and 53 and the convex portions 52 and 53, and vibrations are not easily transmitted to the hand by the space. , Less fatigue. In particular, since the convex portions 52 and 53 are mainly formed on the upper inner surface of the cover 2, it is difficult for vibration to be transmitted to the hand when the power tool 1 is pressed from above to perform the polishing operation. On the other hand, since the convex portions 52 and 53 are not formed in the lower half area of the inner surface of the cover 2, the stretchability of the lower half area of the cover 2 is not lowered, and therefore the cover 2 can be easily extended and retracted. . Further, since the convex 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 an independent island shape, and is made of rubber. Even so, a stable operation feeling can be obtained.

  In addition, since the collar part 43 is formed in the rear-end part lower part of the cylindrical cover part 34, a finger can be hooked on the collar part 43. FIG. For example, when carrying the electric power tool 1, it can be easily carried by hooking a finger on the collar 43. Further, the cover 2 can be used as a so-called reversible by turning the cover upside down.

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

  Furthermore, the configuration of the grip 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 grip portion 20 extends outward, the extension The insertion part which is a part of the cover 2 is hooked on a part, and the structure which covers the upper holding part 23, extending the cover 2 in that state may be sufficient. The inserted portion may be a cylinder that covers the extending portion, or may be an annular shape.

1 Electric tool (tool body)
2 Cover 10 Motor 11 Housing 11a Lower housing 11b Upper housing 12 Polishing plate 13 Main shaft 14 Intake port 15 Exhaust port 16 ON / OFF switch 17 Power cord 18 Cord holder 20 Grip portion 21 Body portion 22 Skirt portion 23 Upper grip portion 24 Grip portion 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 Projection 39 Back opening part 41 Oblique engagement part 42 Engagement protrusion 43 Gutter part 50 Ventilation Mouth 51 Non-slip ridge 52 ridge rib (convex)
53 Cylindrical rib (convex)

Claims (7)

  An electric tool comprising a rubber cover that is detachably attached to a grip portion of a tool body by elasticity. The tool body includes an upper gripping portion as a gripping portion having an upper surface that presses the hand from above, and an extending portion extending outward.
The cover includes an upper cover portion that covers the upper gripping portion of the tool body from above, and an insertion portion through which the extension portion of the tool body is inserted, and the upper cover in a state where the insertion portion is inserted into the extension portion of the tool body. The electric tool according to claim 1, wherein the power tool is mounted on the tool body so that the portion is placed on the upper gripping portion of the tool body. The extending part is a grip part that constitutes a part of the grip part, and the upper grip part has a shape protruding in a bowl shape toward the outside,
The inserted portion of the cover is a cylindrical cover portion that covers the outer peripheral surface of the grip portion of the tool body,
The power tool according to claim 2, wherein the upper cover portion of the cover has an opening portion opened to the lower side and is attached to the upper grip portion so as to expand the opening portion.   The power cord extends from the grip portion, an opening is formed at an end of the cylindrical cover portion, and the cover is attached and detached so as to pass the power cord through the cylindrical cover portion. Electric tool.   The electric tool according to claim 3 or 4, wherein an elongation rate of the cylindrical cover portion when attached to the tool body is larger than an elongation rate of the upper cover portion.   An air inlet is formed in the grip portion of the tool body, a vent is formed in the cover so as to correspond to the air inlet, and the opening edge of the vent on the inner surface side of the cover extends over the entire circumference. The power tool according to any one of claims 1 to 5, wherein a convex portion is formed.   A rubber power tool cover that is detachably attached to the grip portion of the power tool by elasticity.

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