JP2022128530A - Pair of machine screw and bit tools - Google Patents

Abstract

To provide a pair of machine screw and bit tools, not separating from a bit until a work for fastening or loosening a machine screw is completed.SOLUTION: A large diameter female thread part 2 is formed into a right-handed thread, inside an upper stage part of a machine screw head 1a, and a small diameter female thread part 3 located coaxially with the large diameter female thread part 2 is formed into a left-handed thread, inside a lower stage part of the machine screw head 1a, and a large diameter male thread part 5 screwed with the large diameter female thread part 2 is formed into a right-handed thread, on one end of a bit 4, and a small diameter male thread part 6 screwed with the small diameter female thread part 3 is formed into a left-handed thread, on the other end of the bit 4. In addition, a groove for a plus bit engaged with the tip of the plus bit is formed around the large diameter female thread part 2 on the upper stage part of the machine screw head 1a.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a screw and bit pair tool that does not leave the bit until the work of tightening or loosening the screw is completed.

Conventionally, when a screw is tightened or loosened from a material, the bit often comes off the head of the screw. Also, when tightening or loosening a small screw, the screw is often dropped. Therefore, there is a problem that the user cannot release the screw until the work of tightening or loosening the screw is completed.

In order to solve the above-described problems, for example, the following prior arts have been proposed with regard to screws having a screw holding function (fall prevention, etc.).

Japanese Utility Model Laid-Open No. 7-7872 (Patent Document 1) discloses a screw having a locking hole vertically provided in the center of the top portion, and a locking body that is fitted and locked into the locking hole of the screw at the tip of a driver rod. A "combination of a screw and a driver and the screw and the driver" has been proposed, which is a combination of a driver protruding from the center.

Japanese Utility Model Laid-Open No. 5-80674 (Patent Document 2) proposes a "screw bit" in which a screw is securely held by a screw locking projection provided at the tip of the bit.

Japanese Utility Model Laid-Open No. 7-227770 (Patent Document 3) proposes a "catch adapter" that holds a screw or the like with an appropriate holding force.

Further, Japanese Patent Application Laid-Open No. 7-1352 (Patent Document 4) proposes a "screw driver with a tube" in which a screw is pressed against the tip of the screw driver by the elasticity of the tube.

Further, Japanese Utility Model Laid-Open No. 51-62198 (Patent Document 5) proposes a "screw holder for a screwdriver" that can reliably hold a screw in a fixed posture.

Japanese Utility Model Laid-Open No. 7-7872 Japanese Utility Model Laid-Open No. 5-80674 Japanese Utility Model Laid-Open No. 7-227770 JP-A-7-1352 Japanese Utility Model Laid-Open No. 51-62198

However, with the techniques described in Patent Documents 1 to 5 above, if the screw and the bit do not mesh, there is a problem that the screw may come off or be screwed at an angle during the operation of tightening the screw.

Therefore, the present invention has been diligently developed by the inventors of the present invention in view of the above problems, and an object of the present invention is to provide a tool pair consisting of a screw and a bit that does not separate from the bit until the work of tightening or loosening the screw is completed. .

In order to solve the above-mentioned problems, the invention according to claim 1 has a large-diameter female screw portion formed in a right-handed screw inside the upper step portion of the screw head, and the large-diameter female screw portion inside the lower step portion of the screw head. A small-diameter female thread portion coaxial with the diameter female-thread portion is formed on the left-hand side, a large-diameter male-thread portion is formed on one end of the bit as a right-hand thread, and a large-diameter male thread portion is formed on the other end of the bit. A small-diameter male threaded portion to be screwed into the small-diameter female threaded portion is formed on a left-handed thread, and when the screw is tightened, the large-diameter male threaded portion of the bit is screwed into the large-diameter female threaded portion of the screw head to be integrated. On the other hand, when the screw is loosened, the small-diameter male threaded portion of the bit is screwed into the small-diameter female threaded portion of the screw head and loosened together.

According to the second aspect of the invention, a groove for a Phillips bit is formed around the large-diameter female threaded portion of the upper step portion of the screw head according to the first aspect to engage with the tip of a Phillips bit. It is characterized by

As described above, according to the paired tool of the screw and bit according to the present invention, the screw and the bit can be screwed together and fixed. Work can be performed without holding the screw, thereby improving the work efficiency of tightening or loosening screws when working at high places, working upwards, or working with one hand in narrow spaces. In addition, since the screw can be reliably prevented from falling during operation, there is no possibility of damaging the material with the tip of the bit or injuring the fingertip due to the bit.

FIG. 2 is a front partial cross-sectional view showing an example of a screw according to the present invention; Plan view of FIG. 1 is a front view showing an example of a bit according to the present invention; FIG. Bottom view of Figure 3 Plan view of FIG. Front partial sectional view when tightening the screw in Fig. 1 The perspective view which shows the usage condition when tightening the screw of FIG. Front partial cross-sectional view when loosening the screw in Fig. 1 The perspective view which shows the usage condition when loosening the screw of FIG. FIG. 2 is a front partial cross-sectional view showing another example of a screw according to the present invention; Plan view of FIG. Front partial cross-sectional view when tightening or loosening the screw in FIG.

An embodiment of the present invention will be described below with reference to the drawings. The configurations of screws and bits according to the present invention are not limited to the following examples, and can be changed as appropriate according to usage conditions.

FIG. 1 is a front partial sectional view showing an example of a screw according to the present invention, and FIG. 2 is a plan view. As shown in FIG. 1 or 2, a large-diameter female screw portion 2 is formed in a right-handed thread inside the upper step portion of the screw head portion 1a. A left-handed small-diameter female threaded portion 3 coaxial with the large-diameter female threaded portion 2 is formed inside the lower portion of the screw head portion 1a. The diameter and depth of the large-diameter female threaded portion 2 and the small-diameter female threaded portion 3 can be appropriately changed according to the diameter and thickness of the screw head portion 1a.

3 is a front view showing an example of the bit according to the present invention, FIG. 4 is a bottom view, and FIG. 5 is a plan view. As shown in FIGS. 3 to 5, a right-handed large-diameter male threaded portion 5 is formed at one end of a bit 4 attached to an electric screwdriver to engage with the large-diameter female threaded portion 2 . A small-diameter male threaded portion 6 screwed into the small-diameter female threaded portion 3 is formed on the other end of the bit 4 in a left-handed manner.

6 is a front partial cross-sectional view when the screw is tightened, and FIG. 8 is a front partial cross-sectional view when the screw is loosened. As shown in FIG. 6, when tightening the screw 1, the large-diameter male threaded portion 5 of the bit 4 is screwed into the large-diameter female threaded portion 2 of the screw head 1a and rotated clockwise to tighten. As a result, the screw 1 and the bit 4 are integrated when the screw 1 is tightened, and the tightening operation can be performed without holding the screw 1 (see FIG. 7). On the other hand, as shown in FIG. 8, when loosening the screw 1, the small-diameter male threaded portion 6 of the bit 4 is screwed into the small-diameter female threaded portion 3 of the screw head 1a and rotated counterclockwise to loosen. As a result, the screw 1 and the bit 4 are integrated when the screw 1 is loosened, and the loosening operation can be performed without holding the screw 1 (see FIG. 9).
As described above, by adopting the paired structure of the screw and the bit that do not separate from the bit 4 until the work of tightening or loosening the screw 1 is completed, the work efficiency of tightening or loosening the screw 1 is improved, and the screw during work is improved. 1 can be reliably prevented from falling.

Next, FIG. 10 is a front partial sectional view showing another example of the screw according to the present invention, and FIG. 11 is a plan view. As shown in FIG. 10 or 11, in another example of the screw, a large-diameter female threaded portion 2 is formed in a right-handed thread inside the upper portion of the screw head portion 1a in the same manner as the above-described example, and the lower portion of the screw head portion 1a is formed with a large-diameter female thread portion 2. A left-handed small-diameter female threaded portion 3 coaxial with the large-diameter female threaded portion 2 is formed inside the portion. In addition, grooves 7 (four places) for a Phillips bit tapered in side view to engage with the tip of a Phillips bit 8 (see FIG. 12) are formed around the large-diameter female threaded portion 2 of the upper portion of the screw head 1a. ing. By adding the Phillips bit groove 7 in this way, it becomes possible to tighten or loosen the screw 1 using the Phillips bit 8 as shown in FIG.

1 screw 1a screw head 2 large-diameter female threaded portion 3 small-diameter female-threaded portion 4 bit 5 large-diameter male-threaded portion 6 small-diameter male-threaded portion 7 Phillips bit groove 8 Phillips bit

Claims (2)

A large-diameter female threaded portion is formed as a right-handed thread inside the upper step of the screw head, and a small-diameter female threaded portion is formed as a left-handed thread inside the lower stepped portion of the screw head, coaxially with the large-diameter female threaded portion,
A large-diameter male threaded portion screwed into the large-diameter female threaded portion is formed on one end of the bit as a right-handed thread, and a small-diameter malely-threaded portion screwed into the small-diameter female threaded portion is formed in the other end of the bit as a left-handed thread,
When tightening the screw, the large-diameter male threaded portion of the bit is screwed into the large-diameter female threaded portion of the screw head and tightened together. A pair of tools comprising a screw and a bit, characterized in that the small-diameter male threaded portion of the bit is screwed into the female threaded portion and loosened together. 2. The paired screw and bit tool according to claim 1, wherein a groove for a Phillips bit that engages with a tip of the Phillips bit is formed around the large-diameter female threaded portion of the upper portion of the screw head. .

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