JPH05169372A - Dustproof device for clamping tool - Google Patents

Abstract

PURPOSE:To reduce the extent of dust penetrating into the side of a gear cover by attaching a protective member, serving as dust proofing, to the tip of an adjusting member for adjusting a depth of thread fastening. CONSTITUTION:In a protective member 3 to be installed at the tip of an adjusting member 2, there are provided a screw head receiving part 3a and a projecting part 3b for reducing a clearance being produced in space between a screw head outer diameter and a pit outer diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof mechanism for a screw driver.

[0002]

2. Description of the Related Art As a conventional general screwdriver structure, the applicant filed an application on October 7, 1983, and was published on May 11, 1985.
There is number 9. First, the basic operation of the screwdriver will be described with reference to Japanese Utility Model Laid-Open No. 60-64669. When the screw tightening work is not performed, the clutch is disengaged by the action of the spring arranged inside. If you attach a drywall screw to the tip tool and hit it against the work piece, the tip tool moves in the direction that contracts the spring, which causes the clutch to engage and transmit the rotation of the motor to the tip tool to start screw tightening work. To do. As the screw tightening work progresses, the adapter first comes into contact with the workpiece. At this point, the pressing force applied to the drywall screw by the operator is offset, so that the drywall screw is screwed in by the restoring force of the spring and the force generated by the clutch. When the drywall screw is screwed in for a certain distance, the clutch is disengaged, and the screw tightening work is completed. The adapter is screwed to the gear cover, and can rotate to move in the axial direction.

In the construction of Japanese Utility Model Laid-Open No. 60-66469, the adapter, that is, the adjusting member 2 referred to in the present invention, is a direct work piece when screwing a soft member such as a gypsum board. There was a problem that it came into contact with the gypsum board and damaged its surface.

Further, Japanese Utility Model Laid-Open No. 60-66469 has a structure in which the position of the adapter with respect to the tip tool is adjusted so that the clutch is disengaged at the end of screw tightening. It also had the problem that it had to be readjusted.

[0005] Therefore, such a full-scale Sho 60-60646
In order to eliminate the drawback of No. 9, a screw driver having a structure shown in FIG. 5 has been proposed in the past. That is, by providing the protective member 6 made of an elastic member such as rubber at the tip end of the adjusting member 2, it is possible to prevent the surface of the workpiece to be abutted from being scratched, and to loosen the screw, the protective member 6 is used. It is possible only by detaching from the adjusting member 2. The protective member 6 shown in FIG. 5 is in close contact with the adjusting member 2 with an appropriate tightening force. Also, the outer diameter of the head of a drywall screw that is generally used for screwdrivers is 3.5.
Since it is from mm to 6.0 mm, the protective member 6 having an inner diameter larger than the maximum outer diameter 6 mm of the screw head is the adjusting member 2.
Was installed on.

[0006]

When the gypsum board is screwed, fine particles of dust are generated due to the characteristics of the gypsum board. In the above-described conventional screwdriver, since the inner diameter of the protective member is 6 mm or more, a clearance is generated between the bit and the protective member, and fine particles of dust enter the screwdriver main body from the clearance, and the adjusting member is operated. Accumulates on the screw part connected to the gear cover. As a result, the threaded portion is clogged, the adjusting member cannot move in the axial direction of the bit, and the screwing depth cannot be adjusted. An object of the present invention is to provide a tightening tool having a good operability by reducing the amount of dust entering the gear cover side by devising the shape of the protective member.

[0007]

The above object can be achieved by providing a protrusion on the gear cover side of the inner surface of the protective member to reduce the clearance generated between the bit outer diameter and the outer diameter.

[0008]

The fine particulate dust generated by the screw tightening work enters the protective member, but is prevented from entering the screw driver main body by the protruding portion provided on the gear cover side on the inner surface of the protective member.

[0009]

EXAMPLE An example according to the present invention will be described below. The dustproof mechanism according to the present invention is shown in FIGS. 1, 2, 3, and 4.
As shown in FIG. 1, a gear cover 1 for accommodating the power transmission portion, a screw portion 1 a formed at the tip of the gear cover 1, and a groove 1
b, an adjusting member 2 called a stopper that is screwed with the gear cover 1 and movable in the axial direction, a protective member 3 made of an elastic member such as rubber attached to the tip of the adjusting member 2, and a screw head provided on the protective member 3. Part receiving portion 3a and protection member 3
It is composed of a protruding portion 3b and a bit 4 provided on the inner surface on the gear cover side.

The protective member 3 mounted on the tip of the adjusting member 2 so as to be in close contact with the end face has an elastic force and is provided with an appropriate tightening margin with respect to the outer diameter of the tip of the adjusting member 2. It is dimensioned so that it will not come loose due to the vibration of the screw tightening work, and that it can be easily attached and detached depending on the screw size. Further, the inner diameter of the screw head receiving portion 3a is determined with respect to the outer diameter of the head of a drywall screw or the like, and the inner diameter of the protruding portion 3b is determined with respect to the outer diameter of the bit 4 so as to minimize the clearance. is doing. As described above, since the fine-grained dust generated during the gypsum board mounting work is prevented from entering both the screw head receiving portion 3a and the protruding portion 3b, a double dustproof effect can be obtained. With such a configuration of the protection member 3, it is possible to reduce the intrusion of dust, so that it is possible to provide a fastening tool that is inexpensive and has good operability.

By further adding the following configuration, even if dust enters the adjusting member 2, it can be reliably discharged. Groove 1b formed in gear cover screw portion 1a
Is dimensioned so that the groove diameter dimension D is always smaller than the thread root diameter dimension E of the gear cover 1. As a result, even if dust enters the threaded portion of the gear cover 1, the adjustment member 2
By turning, the dust can be moved along the lead of the screw and discharged into the groove 1b. Further, since the groove 1b is formed up to the tip of the gear cover 1 and the screw portion 1a is in a penetrating state with the outside, the dust discharged into the groove 1b is surely discharged to the outside of the gear cover.

Then, once the protective member 3 is removed and the main body is turned downward, the dust already discharged to the outside of the gear cover can be discharged to the outside through the inner diameter portion of the adjusting member 2.

[0013]

As described above, according to the present invention, it is possible to reduce the intrusion of dust into the adjusting member by a simple method, so that it is possible to provide a cheap and easy-to-operate fastening tool.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a dustproof mechanism for a tightening tool according to the present invention.

FIG. 2 is a detailed vertical sectional side view showing a tip end portion of an adjusting member in FIG.

FIG. 3 is a front view showing the groove shape formed in the gear cover screw portion of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a vertical sectional side view showing a tip portion of an adjusting member of a conventional tightening tool.

[Explanation of symbols]

1 is a gear cover, 1a is a screw part, 1b is a groove, 2 is an adjusting member, 3 and 6 are protective members, 3a is a screw head receiving part, 3b.
Is a protrusion, 4 is a bit, 5 is a drywall screw, D is a groove diameter dimension, and E is a thread root diameter dimension.

Claims (1)

[Claims] 1. A bit for tightening a screw, an adjusting member for adjusting a tightening depth of a screw tightened by the bit, a gear cover screwed at one end of the adjusting member, and a other end of the adjusting member. A fastening tool having a protective member, wherein a protrusion is provided on the inner surface of the protective member on the gear cover side.