JP2004261906A - Handle structure for power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool adding a function attenuating vibration generated in a thrust direction in operating the power tool in addition to a slip preventing function, without increasing the thickness of soft material of a handle cover surface; having good productivity and operability; and offering high customer satisfaction. <P>SOLUTION: The power tool comprises a housing containing an electric motor; a handle 1 operated/held by a worker; and the handle cover 3 equipped around a grip portion of the handle, formed to have a surface softer than the handle or with a large friction coefficient, and enabled to be attached/detached to/from the handle. An elastic element 3b is disposed on at least a part between the handle cover and a handle engaging portion, and the handle cover can move in a thrust direction of the tool in regard to the handle. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a handle structure of a power tool.
[0002]
[Prior art]
An example of a conventional power tool will be described with reference to FIGS. 8 is a side view showing an example of an electric drill as an electric tool, FIG. 9 is a sectional view taken along line AA of FIG. 8, FIG. 10 is an enlarged partial sectional view of a main part, and FIG. FIG. 12 is a development view of FIG.
[0003]
As shown in FIG. 8, the electric drill includes a housing 2 having a built-in electric motor (not shown), a tool holding unit 7 provided on the right side of the housing 2 and driven by the electric motor, and a side opposite to the tool holding unit 7 of the housing 2. A handle 1 is provided integrally with the housing 2 and extends substantially at right angles to the axial direction of the housing 2. A handle cover 3 is provided on the handle 1 opposite to the tool holding portion 7, and the handle cover 3 is fixed to the handle 1 by screws 4.
[0004]
The handle 1 includes handle members 1a and 1b, both of which are provided with a screw through hole 1c and a handle cover seat surface 1d. The handle cover 3 includes a base portion 3a formed of a relatively hard material and a grip portion 3b formed of a relatively soft material having a large friction coefficient. The base portion 3a is provided with screw through holes 1c provided in the handle members 1a and 1b, screw mounting seats 3c and 3d corresponding to the handle cover seat surface 1d, female screw holes 3e, and a handle mounting seat 3f.
[0005]
With the handle members 1a and 1b aligned, the handle cover 3 is positioned so that the screw through hole 1c and the female screw hole 3e of the handle cover 3 correspond, and the screw 4 is screwed into the screw through hole 1c and the female screw hole 3e. By doing so, the handles 1a and 1b are sandwiched by the handle mounting seat 3f, and the handle cover 3 is fixed to the handle 1.
[0006]
This type of electric tool has a handle cover 3 formed of a material having a relatively soft surface (grip portion 3b) and a large coefficient of friction on the side of the handle 1 opposite to the tip tool 7, so that vibration applied during work can be reduced. The workability is improved by suppressing the transmission of the impact to the operator and making it easier to grip the handle 1. In addition, since one screw 4 penetrates through the screw through hole 1c of the handle 1 and can be screw-engaged with the female screw hole 3e of the handle cover 3, the fixing work of the split handle 1 and the handle cover 3 can be performed. Is configured to be able to be performed by one operation.
[0007]
[Problems to be solved by the invention]
In the conventional power tool having the above-described configuration, the grip portion 3b of the handle cover 3 is formed of a material that is relatively soft and has a large coefficient of friction. However, in terms of suppressing the vibration and shock applied to the operator when the handle 1 is being gripped, the vibration and shock can be reduced only by the deformation of the grip portion 3b itself. Since it cannot be absorbed, the effect of damping vibration and impact by the handle cover 3 is low.
[0008]
It is conceivable to increase the thickness of the grip portion 3 in order to improve the damping effect of vibration and shock. In this case, however, the outer diameter of the handle 1 is increased, so that the handle 1 is enlarged and the handle 1 is gripped. In addition to the drawback that the workability is reduced and the workability is reduced, there is also a problem of a decrease in productivity such as the appearance of sink marks easily occurring when the handle cover 3 is formed.
[0009]
An object of the present invention is to provide a power tool which can solve the above-mentioned drawbacks, improve operability, and improve the damping effect of vibration and impact.
[0010]
[Means for Solving the Problems]
The above object is achieved by disposing an elastic body in at least a part between a handle cover and a handle engaging portion, and making the handle cover movable with respect to the handle in a thrust direction of a tool.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the power tool of the present invention will be described below with reference to FIGS.
[0012]
1 is a cross-sectional view at the same position as FIG. 9, FIG. 3 is an expanded view of FIG. 1 in parts, FIG. 2 is a partial cross-sectional view of FIG. 1 viewed from the side, and FIG. 4 is a side view of FIG. is there. The handle 1 includes handle members 1a and 1b, both of which are provided with a through-hole 1e and a handle cover seat surface 1d. Here, the longitudinal direction of the through-hole 1e is substantially parallel to the thrust direction at the time of operating the tool. The sleeve 6 is a cylindrical member. The inner diameter is slightly larger than the outer diameter of the screw 4, and when the outer diameter is inserted into the elongated through hole 1e, a gap 5a is formed in the longitudinal direction of the elongated through hole 1e. The size is such that it can be easily moved in the longitudinal direction of the long hole 1e. The length of the sleeve 6 is set to slightly protrude from the handle cover seat surface 1d.
[0013]
The handle cover 3 is composed of a base portion 3a made of a hard material and a grip portion 3b made of a soft material having a relatively high friction coefficient. The same material is projected from the base portion 3a to form a projection 3g. The base portion 3a is provided with a screw mounting seat 3c, a screw mounting hole 3d, a female screw hole 3e, and a handle mounting seat 3f at positions corresponding to the elongated through hole 1e and the handle cover seat surface 1d. In particular, the positions of the screw mounting hole 3d and the female screw hole 3e correspond to the center position of the sleeve 6 when the sleeve 6 is assembled in the elongated through hole 1e and is moved rearward. The handle cover 3 clamps the end face of the sleeve 6 by tightening the screw 4. Here, as described above, since the sleeve 6 is movable in the longitudinal direction of the through-hole 1e, the handle cover 3 is movable relative to the handle 1 in the thrust direction of the tool. In the assembled state, the handle cover 3 and the handle 1 are in contact via the protrusion 3g and the sleeve 6. Gaps 5a to 5d are provided for the other engaging portions. In addition, the shape and size of each part are devised so that the amount of the gaps 5a to 5d does not become zero even if a load is applied to the handle cover 3 and the projection 3g is elastically deformed.
5 is a sectional view of the handle cover 3, FIG. 6 shows a positional relationship between the handle 1, the handle cover 3, and the sleeve 6 when the handle cover 3 is assembled, and FIG. 7 shows a state at the time of operation. When a load is applied during operation, the protrusion 3g is crushed, and at the same time, the sleeve 6 moves forward. Therefore, regarding the thrust direction, the handle cover 3 is only in contact with the handle 1 via the protrusion 3g. Thus, the vibration in the thrust direction generated at the time of operation is attenuated by the projection 3g, and is hardly transmitted to the handle cover 3. Note that the damping force can be adjusted by devising the thickness, arrangement, number, and the amount of crushing in the assembled state of the projection 3g.
[0014]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, since a vibration damping function can be added in addition to a slip prevention function without reducing productivity, an operability is good and a power tool with high customer satisfaction can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.
FIG. 2 is a partial sectional view showing an embodiment of the present invention.
FIG. 3 is a development view of FIG. 1;
FIG. 4 is a partial sectional development view showing an embodiment of the present invention.
FIG. 5 is a partial sectional view showing an embodiment of the present invention.
FIG. 6 is a partial sectional view showing an embodiment of the present invention.
FIG. 7 is a partial sectional view showing an embodiment of the present invention.
FIG. 8 is a side view showing an electric drill as an example of a power tool.
FIG. 9 is a sectional view taken along the line AA of FIG. 8, showing a conventional technique.
FIG. 10 is a partial sectional view showing a conventional technique.
FIG. 11 is a development view of FIG. 9;
FIG. 12 is a partial sectional development view showing a conventional technique.
[Explanation of symbols]
1 is a handle, 1a and 1b are handle members, 1c is a screw through hole, 1d is a handle cover seat surface, 1e is a through hole, 2 is a housing, 3 is a handle cover, 3a is a base portion, 3b is a grip portion, and 3c. Is a screw mounting seat, 3d is a screw mounting hole, 3e is a female screw hole, 3f is a handle mounting seat, 3g is a projection, 4 is a screw, 5 is a gap, and 6 is a sleeve.

Claims (1)

A housing containing an electric motor, a handle operated and held by an operator, and a handle mounted around the handle, the surface of which is formed to be more flexible or have a higher coefficient of friction than the handle, and is detachable from the handle. An electric tool having a handle cover, wherein an elastic body is arranged at least in a part between the handle cover and the handle engagement portion, and the handle cover is movable in a thrust direction of the tool with respect to the handle. The power tool handle structure.

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