JP4529550B2 - Portable power tools - Google Patents

Description

  The present invention relates to a portable power tool having an improved grip portion.

  Conventional examples of this type of portable power tool are shown in FIGS. 5 is a side view of a conventional portable power tool, and FIG. 6 is a sectional view taken along line BB in FIG.

A portable power tool 101 shown in FIG. 5 is a hand drill, and a resin main body 102 is integrally formed with a grip portion 102a extending downward. Here, as shown in FIG. 6, the main body 102 is configured by joining and integrating a pair of left and right outer frames 103, 104 by concave and convex fitting, and inside thereof as a drive source A drive unit such as an electric motor (not shown) or an engine is incorporated.

  In addition, a switch 109 for controlling activation / deactivation of the drive unit is built in the grip unit 102a. Here, the narrower the grip portion 102a, the easier it is to grip, but since it is necessary to secure a space sufficient to house the switch 109, it is usually set as thin as possible to accommodate the switch 109.

  By the way, a grip cover 110 made of a soft elastic body such as an elastomer is integrally formed on a part of the back side of the grip portion 102a of the main body 102 (left and right outer frames 103, 104). The impact at the time of work is absorbed, and the soft feeling and fit feeling when the user holds the grip portion 102a by hand are enhanced.

  Therefore, the thickness t (see FIG. 6) of the grip cover 110 is set as thin as possible in consideration of operability so that the grip portion 102a is not thickened and the grip portion 102a is difficult to grip. .

  Further, in order to enhance the slip prevention effect of the grip portion 102a and further improve the fit, a proposal has been made to form a plurality of recesses 111 on the outer surface of the grip cover 110 as shown in the partial cross-sectional view of FIG. (See Patent Document 1).

  In addition, in order to enhance the shock absorbing capacity of the grip part, as shown in the cross-sectional view of FIG. 8, a silicone-based gel cushioning material 211 is formed in a space formed between the grip part 202a and the grip cover 210 divided into two parts. There is also a proposal of interposing a buffer sheet 213 which is hermetically sealed in a resin film 212 (see Patent Document 2).

  In addition, the outer grip part is further attached to the outer periphery of the grip part, and the concave part and the convex part are fitted to each other so that the outer grip part is detachably attached to the grip part and the thickness of the grip part is selected. Proposals have also been made (see Patent Document 3).

Special Table 2002-542060 JP-A-7-205055 JP 2001-310273 A

  However, in the portable power tool having the grip portion structure shown in FIGS. 6 and 7, the thickness t of the grip cover 110 is reduced in consideration of operability as described above. The soft feeling and fit feeling as functions of the above are not obtained as expected, and there is a possibility that the merit by providing the grip cover 110 cannot be fully utilized.

  Further, in the portable power tool having the grip portion structure shown in FIG. 8, there is a problem that the number of parts increases and the structure becomes complicated because the buffer sheet 213 is incorporated.

  Furthermore, in the configuration described in Patent Document 3, it is difficult to reduce the size of the switch built in the grip portion in order to make the grip portion thin. It has also been proposed to provide anti-slip protrusions on the grip portion and the outer surface of the grip, but the expected level of softness and fit could not be obtained.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to stably perform the required work by increasing the softness and fit of the grip portion without increasing the thickness of the grip cover. An object of the present invention is to provide a portable power tool that can reduce fatigue of the user.

In order to achieve the above object, the invention according to claim 1
A drive unit comprising a motor or an engine, etc .;
A switch for controlling start / stop of the drive unit;
A main body incorporating the same drive unit;
A grip portion extending from the body and incorporating the switch;
A grip cover made of a soft elastic body and attached to the outer surface of the grip part so as to be integrally molded or detachable;
In a portable power tool having
A plurality of protrusions are provided on the outer surface of the grip cover, and a hollow portion is provided between the protrusion and the outer surface of the grip portion and at a position facing the protrusion .

According to a second aspect of the present invention, in the first aspect of the present invention , the grip portion is further provided with a through hole that allows the inside of the grip portion to communicate with the hollow portion.

The invention described in claim 3 is characterized in that the cavity of the invention described in claim 2 is deleted, and the through hole has a function of the cavity.
According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a convex portion that protrudes from the rear surface toward the grip portion is provided at a position corresponding to the protrusion on the rear surface of the grip cover. A concave portion to be engaged is provided on the outer surface of the grip portion.

  According to the first aspect of the present invention, when the user grips the grip portion of the main body with his / her hand, a sufficient soft feeling is obtained because a load is applied to the plurality of protrusions provided on the outer surface of the grip cover and these are deformed. In addition, since the plurality of protrusions are deformed and the outer surface of the grip cover becomes flat, the grip cover comes into close contact with the palm, and slipping is surely prevented, and a high fit can be obtained. As a result, even if the thickness of the grip cover is not increased, a sufficient soft feeling and high fit can be obtained in the grip portion, and the required work can be stably performed using the portable power tool. The user's fatigue can be reduced, and the operation can be continued for a long time. In this case, since the deformation of the protrusion is promoted by the hollow portion provided between the protrusion and the outer surface of the grip part, the soft feeling and the fit feeling of the grip part are further enhanced.

  According to the second aspect of the present invention, since the hollow portion formed in the protrusion is communicated with the space in the main body through the through hole formed in the grip portion of the main body, sealing of the hollow portion is prevented. The deformation of the protrusion is not hindered by the hollow portion, and a sufficient soft feeling and a high fit feeling are ensured in the grip portion.

According to the third aspect of the present invention, since the through hole has the function of the hollow portion, it is possible to enhance the soft feeling and fit feeling of the grip portion with a simple configuration.
According to the invention of claim 4, since the adhesion area to the grip portion of the grip cover is increased by the engagement of the convex portion formed on the back surface of the grip cover and the convex portion formed on the outer surface of the grip portion of the main body, The grip cover is difficult to peel off from the grip portion. In addition, since the thickness of the protrusion is added to the thickness of the protrusion provided on the grip cover, the thickness near the protrusion of the grip cover is increased, and the protrusion is easily deformed to give the grip portion a high soft feeling. Is done.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a side view of a portable power tool according to the present invention, FIG. 2 is a front view of the power tool, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. FIG. 4B is an enlarged partial cross-sectional view of the outer frame on one side, and FIG. 5B is an enlarged partial cross-sectional view of the outer frame on one side showing a state when the grip portion is gripped.

The portable power tool 1 shown in FIGS. 1 and 2 is a hand drill, and a resin main body 2 is integrally formed with a grip portion 2a extending downward. Here, as shown in FIG. 3, the main body 2 is configured by joining and integrating a pair of left and right outer frames 3, 4 by concave-convex fitting. A reduction gear (not shown) that constitutes an electric motor (not shown) and a reduction mechanism is incorporated. The pair of left and right outer frames 3 and 4 are formed by integrally molding a hard resin such as polypropylene, polycarbonate, nylon, and ABS. Moreover, although the portable power tool 1 which concerns on this Embodiment is provided with an electric motor as a drive source, the portable power tool provided with an engine as a drive source is also included in the application object of this invention.

  A drill chuck 6 is attached to the end of the drive shaft 5 that protrudes forward from the front end of the main body 2, and a drill (not shown) is attached to and detached from the drill chuck 6.

  On the other hand, a power cord 7 extending from an electric motor (not shown) is led out from the lower end portion of the grip portion 2a of the main body 2, and the lead-out portion is protected by a sleeve 8 made of an elastic body such as rubber. A power plug (not shown) is attached to the free end of the power cord 7.

  In addition, a trigger switch 9 is provided on the front surface of the base end portion of the grip portion 2a of the main body 2 for controlling the start / stop of the electric motor of the power tool 1.

  By the way, a grip cover 10 made of a soft elastic body such as an elastomer is integrally formed on a part of the back side of the grip portion 2a of the pair of left and right outer frames 3 and 4 constituting the main body 2, and each grip On the outer surface of the cover 10, a plurality of protrusions 11 are projected at equal intervals. In the present embodiment, a large number of projections 11 are arranged at equal intervals, but these may be arranged at unequal intervals. Further, in the present embodiment, each grip cover 10 is formed integrally with the outer frames 3, 4, but a separate grip cover may be detachably attached to each outer frame 3, 4.

  Thus, as shown in FIGS. 3 and 4, a plurality of protrusions 10a are integrally formed on the back surface of each grip cover 10, and the protrusions are formed on the outer surface of the portion where each protrusion 10a is formed. 11 is protrudingly provided. Further, on the surface of each outer frame 3, 4, recesses 3 a, 4 a are formed to engage with the protrusions 10 a formed on the back surface of the grip cover 10. A cavity 12 is formed in each projection 11 of each grip cover 10 (convex portion 10 a), and each outer frame 3, 4 communicates with the cavity 12 formed in the grip cover 10. Each through hole 13 is formed. Note that the hollow portion 12 and the through hole 13 do not need to be provided for all the protrusions 11, and may be provided for at least one protrusion 11.

  In the portable power tool 1 configured as described above, a power plug (not shown) attached to the end of the power cord 7 is inserted into a power source (not shown), and the grip portion 2a of the main body 2 is gripped by hand. When the trigger switch 9 is pressed with a finger, the electric motor (not shown) built in the main body 2 is energized to drive the electric motor. Then, the rotation of the electric motor is decelerated by a reduction gear (not shown) and transmitted to the drive shaft 5, and the drive shaft 5 and a drill (not shown) attached to the drive shaft 5 are rotationally driven to perform a required drilling operation by the drill. Made.

  By the way, in the portable power tool 1 according to the present embodiment, when the user grasps the grip portion 2a of the main body 2 with his / her hand, as shown in FIG. 4 (a) at the beginning (before grasping the grip portion 2a). Since a load P is applied to the protrusions 11 protruding from the outer surface of the grip cover 10 and each protrusion 11 is deformed as shown in FIG. 4B by this load P, the thickness of the grip cover 10 does not have to be increased. In addition, when the grip portion 2a is gripped, a sufficient soft feeling is imparted to the user's hand, which reduces the user's feeling of fatigue and allows the drilling operation to be continued for a long time. At this time, deformation of the protrusion 11 is promoted by the cavity 12 formed inside the protrusion 11 of each grip cover 10, and the cavity 12 is connected to the main body through the through-hole 13 formed in the outer frames 3 and 4. 2, the cavity 12 is prevented from being sealed, deformation of the protrusion 11 is not hindered by the cavity 12, and a sufficient soft feeling is imparted to the grip 2 a.

  Further, as described above, since the plurality of protrusions 11 are deformed and the outer surface of the grip cover 10 becomes flat as shown in FIG. 4B, the grip cover 10 is in close contact with the palm, and the user's hand and grip Slip between the portions 2a is reliably prevented, and a high fit is obtained for the grip portion 2a. As a result, even if the thickness of the grip cover 10 is not increased, a high fit is imparted to the grip portion 2a, and a necessary drilling operation can be performed by the portable power tool 1 while the grip portion 2a is securely gripped. It can be performed stably.

Furthermore, the concave portion 3a formed respectively on the surfaces of the projections 10a and the outer frame 3 and 4 formed on the back surface of the grip cover 10, the adhesion area to the outer frame 3 and 4 of the grip cover 10 by the engagement between 4a Since it becomes large, the grip cover 10 is difficult to peel off from the outer frames 3 and 4. Further, since the thickness of the protrusion 10a is added to the thickness of the protrusion 11 provided on the grip cover 10, the thickness near the protrusion 11 of the grip cover 10 is increased, and the protrusion 10a is easily deformed, so that the grip portion A high soft feeling is imparted to 2a.

The present invention, only hand drill Narazu are applicable to portable any power tool formed by integrally molded or removably adhered grip cover the outer surface of the grip portion of the body.

It is a side view of the portable power tool which concerns on this invention. 1 is a front view of a portable power tool according to the present invention. It is the sectional view on the AA line of FIG. (A) is the expanded partial sectional view of the outer frame of the one side which comprises a main body grip part, (b) is an expanded partial sectional view of the outer frame of the one side which shows a state when a grip part is grasped. It is a side view of the conventional portable power tool. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is an expanded partial sectional view of the outer frame of the one side which shows the grip part structure concerning the conventional proposal. It is a cross-sectional view which shows the grip part structure based on the conventional proposal.

DESCRIPTION OF SYMBOLS 1 Portable power tool 2 Main body 2a Grip part 3, 4 Outer frame 3a, 4a Recessed part 5 Drive shaft 6 Drill chuck 7 Power cord 8 Sleeve 9 Trigger switch (switch)
10 Grip cover 10a Convex part 11 Protrusion 12 Cavity part 13 Through hole

Claims (4)

A drive unit comprising a motor or an engine, etc .;
A switch for controlling start / stop of the drive unit;
A main body incorporating the same drive unit;
A grip portion extending from the body and incorporating the switch;
A grip cover made of a soft elastic body and attached to the outer surface of the grip part so as to be integrally molded or detachable;
In a portable power tool having
A portable power comprising a plurality of protrusions provided on an outer surface of the grip cover, and a hollow portion provided between the protrusion and the outer surface of the grip portion and facing the protrusion. tool. A drive unit comprising a motor or an engine, etc .;
A switch for controlling start / stop of the drive unit;
A main body incorporating the same drive unit;
A grip portion extending from the body and incorporating the switch;
A grip cover made of a soft elastic body and attached to the outer surface of the grip part so as to be integrally molded or detachable;
In a portable power tool having
A plurality of protrusions are provided on the outer surface of the grip cover, and a cavity is provided between the protrusion and the outer surface of the grip part.
A portable power tool, wherein the grip portion is provided with a through hole that allows the inside of the grip portion to communicate with the hollow portion. A drive unit comprising a motor or an engine, etc .;
A switch for controlling start / stop of the drive unit;
A main body incorporating the same drive unit;
A grip that extends from the body and is gripped by a user;
A grip cover made of a soft elastic body and attached to the outer surface of the grip part so as to be integrally molded or detachable;
In a portable power tool having
Portable power tool, characterized in that a through hole at a position opposed to the protrusion of the grip portion thus is deposited on the grip cover provided with a plurality of projections on the outer surface of the grip cover.   The convex part which protrudes to the said grip part side from the back surface of the said grip cover was provided around the said through-hole, and the recessed part engaged with this convex part was provided in the said grip part outer surface. Or the portable power tool of 3.

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