JPH0791423A - Screw - Google Patents

Abstract

PURPOSE:To enable rupture of a screw head from a screw shaft by tightening force which exceeds a fixed torque of the screw head by forming a driver tightening hole which reaches from the head to the screw shaft. CONSTITUTION:A cross driver tightening hole 3 is provided in a head 2 of a screw 1, and a tip of the hole 3 reaches a screw shaft 4. When unit parts are assembled or a device is assembled by using the screws 1, the screw head 2 is not ruptured if they are tightened with torque below a fixed value, and assembly work can be done in the same way as ordinary screws. Tightening torque can be adjusted by a torque adjusting type electric driver. In the case of disassembly, when the head 2 is tightened with torque above a predetermined value by a cross driver 6, the screw head 2 is broken off from the screw shaft 4 and ruptured, and a member B which is joined on a member A can be removed easily. As a consequence, it is possible to shorten disassembling work hours greatly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw used for assembling devices, parts and the like, and more particularly to a screw having improved workability during disassembly.

[0002]

2. Description of the Related Art In recent years, environmental protection and resource saving have been sought, and efforts for environmental problems have become more and more important. For example, various OA devices used in offices are
There is no exception that is required. In devices such as copiers, facsimiles, printers, etc., which are representative of OA equipment, the developing device, cleaning device, fixing device, etc. are unitized, and only the units that have reached their service limit are replaced, saving resources and costs. Is being reduced.
Traditionally, units that have reached the end of their life have been discarded,
From the viewpoint of effective use of resources, a method of replacing and reusing long-life parts has been proposed. Normally, it is necessary to disassemble the unit in order to replace the life parts. Further, even if the unit is discarded, for example, in the developing device and the cleaning device, since toner is built in the unit,
If it is discarded as it is, the toner may leak or scatter to contaminate the surrounding environment, and therefore it is necessary to disassemble the unit to process the toner inside. Further, in order to reuse not only the unit parts but also the discarded device itself as a resource, it is necessary to dismantle the device made of different kinds of materials.

By the way, in general, various devices and units are often assembled by using screws. Explaining an example of a conventional screw with reference to the drawings, as shown in FIG. 6, a screw 21 is composed of a screw head 22 and a screw shaft 24, and a cross-shaped driver tightening hole 23 is formed in the screw head 22. It is provided.

[0004]

However, in order to dismantle a unit or device or the like assembled by using the conventional screws, the screws must be loosened and removed, which is troublesome in the dismantling work. there were.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in conventional screws and to provide a screw that does not require disassembly work.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned problems are solved in a screw having a driver tightening hole in the head by forming the driver tightening hole from the head to the screw shaft. .

In order to solve the above problems, the present invention proposes to provide a cut groove at the base of the head.

[0008]

[Function] The driver tightening hole of the screw head is formed so as to reach the screw shaft from the screw head. Then, the screw head is ruptured from the screw shaft by tightening the screw head with a force of a certain torque or more.

Further, by providing the notch groove at the base of the screw head, the breakage of the screw head can be made easier and more reliable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the screw 1 of this embodiment is
A cross-shaped driver tightening hole 3 is provided in the head 2. The tip of the driver tightening hole 3 reaches the screw shaft 4. Therefore, when the screw 1 is tightened with a torque of a certain value or more, the screw head 2 is torn from the screw shaft 4 and broken.

When assembling a unit part or device using the screw 1 of this embodiment, if the screw head 2 is tightened with a torque equal to or less than a certain value, the screw head 2 does not break, and the screw head 2 is made in the same manner as a normal screw. Assembly work can be performed. The tightening torque can be easily adjusted by a torque adjustable electric screwdriver used in general assembly work.

In FIG. 2, the member B is connected to the member A by using the screw 1 of this embodiment and a screwing driver 5 dedicated to the screw 1.
It is sectional drawing which shows a mode that it has joined. As shown in this figure, the tip of the screwdriver 5 for tightening work is sharpened so as to match the screwdriver tightening hole of the screw 1.
According to the tightening driver 5, the tightening torque is applied to the entire driver tightening hole 3 of the screw 1, and the screw head 2 can be prevented from breaking.

When the disassembling work is performed, as shown in FIG. 3, the head 2 of the screw 1 is tightened with a torque of a predetermined value or more by using an ordinary cross screwdriver 6, and as shown in FIG.
As shown in, the screw head 2 is torn from the screw shaft 4 and broken. As a result, it is pressed by the screw head 2 and the member A
The member B that has been joined to can be easily removed. Therefore, it is not necessary to loosen the screw 1 many times for the dismantling work, and the working time can be greatly shortened.

The screwdriver 5 for tightening work shown in FIG. 2 can also be used for dismantling work.
If the screw head 2 is used when it is loosened and removed instead of being broken, the screw head 2 can be prevented from breaking and the removal work can be performed.

Next, another embodiment of the present invention will be described.

As shown in FIG. 5, the screw 11 of this embodiment is used.
In the same manner as the screw 1 of the above-mentioned embodiment, the head 12 thereof is provided with a cross-shaped driver tightening hole 13. The tip of the driver tightening hole 13 reaches the screw shaft 14. Then, the groove 15 is formed at the base of the screw head 12.
Are formed. If the screw 11 of this embodiment is tightened with a torque equal to or less than a certain value, the screw head 12 does not break, and the assembling work can be performed in the same manner as a normal screw. When the disassembling work is performed, the head 12 of the screw 11 is tightened with a torque equal to or more than a predetermined value by using an ordinary cross screwdriver as in the above embodiment, and the head 12 is removed from the screw shaft 14. It breaks and breaks. In the screw 11 of this embodiment, the cut groove 15 is formed at the base of the screw head 12, so that the screw head 12 can be easily and reliably broken.

The present invention is not limited to the above embodiment, and the driver tightening hole may be a minus type, for example. Also, a number of deformations are possible, such as a flat screw with a flat head or a hexagonal head.

[0019]

As described above, according to the screw of the present invention, since the screw tightening hole is formed from the screw head to the screw shaft, the screw head is tightened with a torque of a predetermined value or more. Since it is torn from the screw shaft and broken, it is not necessary to loosen the screw many times for disassembling work, and the work time can be greatly reduced.

According to the structure of claim 2, breakage of the screw head can be made easier and more reliable.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a screw of the present invention.

FIG. 2 is a cross-sectional view illustrating an assembly operation using the screw and a dedicated driver.

FIG. 3 is a cross-sectional view for explaining disassembly work using the screw and an ordinary screwdriver.

FIG. 4 is a cross-sectional view showing a state in which the head of the screw is broken.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an example of a conventional screw.

[Explanation of symbols]

 1, 11, 21 Screw 2, 12, 22 Screw head 3, 13, 23 Driver tightening hole 4, 14, 24 Screw shaft 15 Notch groove

Front page continuation (72) Inventor Shigeru Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd. (72) Inventor Shinichi Kawahara 1-3-6 Nakamagome, Ota-ku, Tokyo In Ricoh Co., Ltd.

Claims (2)

[Claims] 1. A screw having a driver tightening hole in a head, wherein the driver tightening hole is formed from the head to a screw shaft. 2. The screw according to claim 1, wherein a cut groove is provided at the base of the head.