JP2005046953A - Screwdriver and screwdriver bit positioning tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screwdriver and a screwdriver bit positioning tool capable of easily fitting a screwdriver bit to the head part of a screw. <P>SOLUTION: In this screwdriver bit positioning tool for positioning the tip part of the screwdriver bit to the head part of the screw, the driver bit 5 is concentrically inserted, and a guide collar 2 is slidably installed on the driver bit 5. The guide collar 2 comprises, at its tip inner periphery, a tapered surface 2 allowed to abut on the head part of the screw and diverging toward the tip thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a driver and a driver bit positioning jig.

In dismantling household electrical appliances such as television receivers, a small screw that connects parts such as a case constituting the product is removed using a screwdriver.
In order to perform the disassembly work efficiently, it is necessary to fit a driver bit to the head of the small screw. For example, Patent Document 1 discloses a technique for securely holding the head of a small screw on a driver bit.
Japanese Patent Laid-Open No. 10-156741

On the other hand, cases of home appliances are often formed of a resin such as plastic, and a screw for fixing the case is often disposed at the bottom of a counterbore formed in the case.
The counterbore formed in the case is often deep, and the head of the screw is difficult to see from the outside of the case. When removing the screw in such a state using a screwdriver, it is difficult to see the head of the screw, so that it takes time to engage the screwdriver bit with the screw head.
Further, when the engagement between the screw head groove and the driver bit is shifted in the rotation direction regardless of the presence or absence of the counterbore, it is necessary to slightly engage the driver bit. When this bit is turned, there is a problem that misalignment tends to occur and workability is lowered.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a driver and a driver bit positioning jig capable of easily engaging a driver bit with a screw head.

  The screwdriver bit positioning jig of the present invention is a screwdriver bit positioning jig for positioning the tip of the screwdriver bit on the head of the screw. The screwdriver bit is inserted concentrically and slidable on the screwdriver bit. The cylindrical member has an attached cylindrical member, and the cylindrical member is provided with a tapered surface on the inner periphery of the tip that can be brought into contact with the head of the screw and expand in diameter toward the tip.

  Preferably, the screw is located at the bottom of the counterbore, and the cylindrical member has an outer diameter smaller than the inner diameter of the counterbore.

  More preferably, it has the elastic member which hold | maintains the said cylindrical member so that sliding is possible.

  The screwdriver of the present invention is a screwdriver used for removing a screw, and includes a screwdriver bit and a cylindrical member into which the screwdriver bit is inserted and provided so as to be slidable with respect to the screwdriver bit. The cylindrical member is capable of contacting the head of the screw and has a tapered surface on the inner periphery of the tip that increases in diameter toward the tip.

  In the present invention, when the cylindrical member is applied toward the screw, the tapered surface comes into contact with the head of the screw. Since the diameter of the taper surface increases toward the tip, the center axis of the cylindrical member is positioned so as to face the center of the screw head. Since the driver bit is inserted concentrically into the cylindrical member, the tip of the driver bit and the center of the screw head are easily aligned. In this state, when the driver bit is slid with respect to the cylindrical member, the driver bit and the screw head are easily engaged with each other.

  According to the present invention, the driver bit can be easily meshed with the head of the screw.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a driver according to an embodiment of the present invention.
In FIG. 1, the driver 1 includes a guide collar 2, a holder portion 3, a coil spring 4, a driver bit 5, and a power feeding cable 6.
The guide collar 2 is an embodiment of the cylindrical member of the present invention, the coil spring 4 is an elastic member of the present invention, and the driver bit 5 is an embodiment of the driver bit of the present invention.

  The holder unit 3 incorporates an electric motor (not shown). The rotating shaft of this electric motor is connected to a driver bit 5. Electric power is supplied to the electric motor through the power supply cable 6 and driven. As a result, the driver bit 5 rotates.

FIG. 2 is a cross-sectional view along the axial direction of the driver 1.
As shown in FIG. 2, the guide collar 2 has one end 2 a connected to one end of the coil spring 4. The other end of the coil spring 4 is connected to the tip 3 a of the holder 3.
A driver bit 5 is inserted in the inner periphery of the guide collar 2.
The guide collar 2 is composed of a cylindrical member.

A guide portion 2 h whose diameter is partially reduced is formed on a part of the inner periphery of the guide collar 2. The driver bit 5 is fitted to the guide portion 2h. The central axis of the guide collar 2 and the central axis of the driver bit 5 are substantially coincident.
The guide collar 2 can slide in the axial direction A <b> 2 of the driver bit 5 against the elastic force of the coil spring 4. The guide collar 2 is slidable in the axial direction A1 by the force of the coil spring 4. Normally, the guide collar 2 is held at a position where the coil spring 4 covers the tip portion 5 a of the driver bit 5.

  A tapered surface 2t is formed on the inner periphery of the tip portion of the guide collar 2. The tapered surface 2t is continuously expanded toward the tip. The taper surface 2t abuts on a screw head, which will be described later, and fulfills a function of guiding it to the center of the driver bit 5.

Next, an example of an object using the driver 1 having the above configuration will be described.
FIG. 3 is a perspective view of the television receiver as viewed from the rear cover side.
The rear cover 100 of the television receiver is molded of plastic, and the rear cover 100 is formed with a plurality of counterbores 100h for screws.
A screw for fixing the rear cover 100 is located at the bottom of the counterbore 100h.

  To remove the screw at the bottom of the counterbore 100h using the screwdriver 1, the counterbore 100h is relatively deep, so the guide collar 2 is inserted into the counterbore 100h as shown in FIG.

As shown in FIG. 5, when the guide collar 2 is inserted into the counterbore 100h, the outer diameter of the guide collar 2 is smaller than the inner diameter of the counterbore 100h. Is positioned.
Since the tapered surface 2t exists at the distal end of the guide collar 2, when the distal end portion of the guide collar 2 is roughly positioned with respect to the screw 110, the tapered surface 2t comes into contact with the head 110h of the screw 110.
As shown in FIG. 6, when the tapered surface 2 t of the guide collar 2 abuts on the head 110 h of the screw 110, the central axis of the screw 110 and the central axis of the driver bit 5 substantially coincide with each other.

When the driver bit 5 is further pushed against the elastic force of the coil spring 4 with the tip of the guide collar 2 in contact with the bottom surface 100t of the counterbore 100h, as shown in FIG. As a result, the driver bit 5 moves relatively.
At this time, the central axis of the screw 110 and the central axis of the driver bit 5 substantially coincide with each other due to the action of the tapered surface 2t of the guide collar 2, so that when the driver bit 5 moves toward the screw 110, the driver bit 5 The front end portion 5a easily meshes with the head portion 110h of the screw 110.

As described above, according to the present embodiment, the guide collar 2 having an outer diameter smaller than the inner diameter of the counterbore 100 h is provided around the driver bit 5, and the tapered surface 2 t is formed at the distal end portion of the guide collar 2. Since the guide collar 2 and the driver bit 5 are slidable in the axial direction, the tip 5a of the driver bit 5 can be easily engaged with the head 110h of the screw 110 located at the bottom of the relatively deep hole. it can.
The outer diameter of the guide collar 2 is slightly smaller than the inner diameter of the counterbore 100h, so that the tip 5a of the driver bit 5 can be more reliably engaged with the head 110h of the screw 110. .

In the above-described embodiment, the case where the screw 110 located on the bottom surface of the counterbore hole 100h is removed has been described. However, the present invention is also effective when a screw that is not inside the counterbore hole is removed. That is, due to the action of the tapered surface 2t at the tip of the guide collar 2, it is easy to engage the tip 5a of the driver bit 5 even with a screw that is not inside the counterbore.
In the above-described embodiment, the case where the plus driver bit is engaged with the screw has been described. However, the present invention can also be applied to a hexagon socket head bolt, a hexagon bolt, a hexagon nut, and the like.
In the above-described embodiment, the guide collar 2 is connected to the holder portion 3 via the coil spring 4. However, the guide collar 2 may be connected to the driver bit 5 via the coil spring 4. Is possible. In this case, when the driver bit 5 is removed from the holder portion 3, the guide collar 2 can also be removed at the same time, so that the replacement workability is improved.
Furthermore, in the above-described embodiment, the case of the electric driver has been described, but the present invention can also be applied to an air driver, a manual driver, and the like.

It is a perspective view of a driver concerning one embodiment of the present invention. FIG. 3 is a cross-sectional view along the axial direction of the driver 1. It is the perspective view which looked at the television receiver from the rear cover side. It is a figure for demonstrating the operation | work procedure which removes a screw using the driver. It is sectional drawing which shows the state in the middle of inserting the driver 1 in the counterbore. It is sectional drawing which shows the state which inserted the screwdriver 1 in the counterbore and the front-end | tip of the guide collar contacted the bottom face. It is sectional drawing which shows the state which the driver bit and the screw | thread head mesh | engaged.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Driver, 2 ... Guide collar, 3 ... Holder part, 4 ... Coil spring, 5 ... Driver bit, 100h ... Counterbore, 110 ... Screw.

Claims (6)

A screwdriver bit positioning jig for positioning the tip of the screwdriver bit on the head of the screw,
A screwdriver bit is inserted concentrically and has a cylindrical member slidably attached to the screwdriver bit;
The cylindrical member is provided with a tapered surface on the inner periphery of the tip that is capable of contacting the head of the screw and expands toward the tip. The screw is located at the bottom of the counterbore,
The driver bit positioning jig according to claim 1, wherein the cylindrical member has an outer diameter smaller than an inner diameter of the counterbore. The driver bit positioning jig according to claim 1, further comprising an elastic member that slidably holds the cylindrical member. The driver bit positioning jig according to claim 1, wherein the cylindrical member has a guide portion that guides the driver bit in an axial direction. A screwdriver used to remove the screw,
A driver bit,
The screwdriver bit is concentrically inserted, and has a cylindrical member provided to be slidable with respect to the screwdriver bit;
The cylindrical member is provided with a tapered surface on the inner periphery of the tip that can contact the head of the screw and expands toward the tip. The screw is located at the bottom of the counterbore,
The driver according to claim 5, wherein the cylindrical member has an outer diameter smaller than an inner diameter of the counterbore.

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