JP3545786B2 - Member fastening structure - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a fastening structure of a member for assembling a device, a part, and the like with screws, and more particularly, to a fastening structure with improved workability during disassembly.
[0002]
[Prior art]
2. Description of the Related Art In recent years, environmental protection and resource saving have been called out, and efforts to address environmental issues have become increasingly important issues. For example, various OA devices used in offices are also required to respond without exception. In apparatuses such as copiers, facsimile machines, and printers that are representative of OA equipment, developing units, cleaning units, fixing units, and the like are unitized, and only units that have reached the endurance limit are replaced to save resources and reduce costs. Is being reduced. Conventionally, a unit that has reached the end of its useful life has been discarded, but a method of replacing and reusing a life component from the viewpoint of effective use of resources has been proposed. Usually, it is necessary to disassemble the unit to replace the life component. Also, even if the unit is discarded, for example, in a developing device or a cleaning device, since the toner is built in the unit, if the unit is discarded as it is, the toner may leak or scatter and contaminate the surrounding environment. It is necessary to disassemble the unit and 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 disassemble the device made of different types of materials.
[0003]
By the way, generally, various devices and units are often assembled using screws. An example of a conventional screw will be described with reference to the drawings. As shown in FIG. 6, the screw 21 includes a screw head 22 and a screw shaft 24, and a cruciform screwdriver tightening hole 23 is formed in the screw head 22. Is provided.
[0004]
[Problems to be solved by the invention]
However, in order to disassemble a unit or a device assembled using conventional screws, the screws must be loosened and removed, and there is a problem that the disassembling operation is troublesome.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems in the conventional member fastening structure and to provide a fastening structure that does not require much time for dismantling work.
[0006]
[Means for Solving the Problems]
According to the present invention, in a joining structure of a member for joining and fastening members with screws by the present invention, a shaft portion provided with a thread groove on an outer periphery, and a shaft portion provided continuously at one end of the shaft portion. A fastening portion formed to have a diameter larger than that of the fastening portion and abutting against the member to be fastened to press the member to be fastened, and a driver fastening hole is provided from the outer surface in the axial direction of the fastening portion to the shaft portion. When the screw is tightened with a torque equal to or greater than a predetermined value, the fastening portion is broken from the shaft portion, and the screw that releases the pressing force on the member to be fastened by the fastening portion is screwed. A holding member and a member to be fastened having a through hole larger in diameter than the shaft portion of the screw and smaller in diameter than the fastening portion, and the shaft portion of the screw is passed through the through hole of the member to be fastened; Is screwed to the holding member. Ri is solved by a fastening structure member, wherein a bonding fastening the fastening subject member and the holding member.
[0007]
Further, the present invention proposes to provide a cut groove at a boundary portion between a shaft portion and a fastening portion of the screw in order to solve the above-mentioned problem.
[0008]
[Action]
A driver tightening hole in the screw head is formed so as to reach the shaft from the fastening portion. Then, the fastening portion is broken from the shaft by tightening the screw with a force equal to or more than a predetermined torque.
[0009]
Further, by providing a cut groove at the root of the screw head, the breakage of the screw head is made easier and more reliable.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0011]
As shown in FIG. 1, the screw 1 of the present embodiment has a cross-shaped screwdriver tightening hole 3 in its head 2. The driver fastening hole 3 has its tip reaching the screw shaft 4. Therefore, when the screw 1 is tightened with a torque equal to or more than a certain value, the screw head 2 is torn off from the screw shaft 4 and breaks.
[0012]
When assembling unit parts or devices using the screw 1 of this embodiment, the screw head 2 does not break if it is tightened with a torque equal to or less than a certain value, and assembling work is performed in the same manner as a normal screw. It can be performed. The tightening torque can be easily adjusted by a torque-adjustable electric screwdriver used in general assembly work.
[0013]
FIG. 2 is a cross-sectional view showing a state in which the member B is joined to the member A by using the screw 1 of the present embodiment and the screwdriver 5 for exclusive use thereof. As shown in this figure, the tip of the tightening work driver 5 is sharpened so as to match the driver tightening hole of the screw 1. According to the screwdriver 5 for tightening operation, the tightening torque is applied to the entire screw hole 3 of the screw 1, and the screw head 2 can be prevented from breaking.
[0014]
Then, when performing the dismantling work, as shown in FIG. 3, when the head 2 of the screw 1 is tightened with a torque equal to or more than a predetermined value using a normal cross driver 6, as shown in FIG. The screw head 2 is torn off from the screw shaft 4 and breaks. As a result, the member B that has been pressed by the screw head 2 and joined to the member A can be easily removed. Therefore, it is not necessary to loosen the screw 1 several times for the dismantling operation, and the operation time can be greatly reduced.
[0015]
Note that the screwdriver 5 for tightening work shown in FIG. 2 can be used for dismantling work. If the screwdriver 1 is used for loosening the screw 1 instead of breaking it, the screw head 2 is prevented from breaking. To perform the removal work.
[0016]
Next, another embodiment of the present invention will be described.
[0017]
As shown in FIG. 5, the screw 11 of the present embodiment has a cross-shaped screwdriver tightening hole 13 in the head 12 similarly to the screw 1 of the above embodiment. The tip of the screw hole 13 reaches the screw shaft 14. A cut groove 15 is formed at the base of the screw head 12. If the screw 11 of this embodiment is also 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 operation is performed, the head 12 of the screw 11 is tightened with a torque equal to or more than a predetermined value using a normal cross driver as in the above-described embodiment. It breaks and breaks. In the screw 11 of the present embodiment, the cut groove 15 is formed at the root of the screw head 12, so that the screw head 12 is more easily and reliably broken.
[0018]
Note that the present invention is not limited to the above-described embodiment, and for example, a screwdriver hole may be a minus type. In addition, various deformations are possible, such as a flat screw having a flat head or a hexagonal pillar.
[0019]
【The invention's effect】
As described above, according to the fastening structure of the member of the present invention, since the screw hole is formed from the screw head to the screw shaft, when the screw head is tightened with a torque equal to or more than a predetermined value, the screw head is screwed. Since it breaks off from the shaft, it is not necessary to loosen the screw several times for dismantling work, and the working time can be greatly reduced.
[0020]
According to the configuration of claim 2, the breakage of the screw head can be made easier and more reliable.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of the screw of the present invention.
FIG. 2 is a sectional view for explaining an assembling operation using the screw and a dedicated driver.
FIG. 3 is a cross-sectional view illustrating a disassembling operation using the screw and a normal driver.
FIG. 4 is a 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 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 Cut groove

Claims (2)

In a fastening structure of a member that joins and fastens a member with a member by a screw,
A shaft portion provided with a thread groove on the outer periphery, and a fastening portion which is provided continuously at one end of the shaft portion, has a larger diameter than the shaft portion, and abuts against a member to be fastened and presses the member to be fastened. A screwdriver hole is provided from the axial outer surface of the fastening portion to the shaft portion, and when the screw is tightened with a torque equal to or more than a predetermined value, the fastening portion is broken from the shaft portion. A screw from which the pressing force on the member to be fastened by the fastening portion is released,
A holding member to which the screw is screwed,
A fastening target member having a through hole larger in diameter than the shaft of the screw and smaller in diameter than the fastening portion,
A member, wherein the holding member and the member to be fastened are joined and fastened by allowing a shaft portion of the screw to pass through the through hole of the member to be fastened and screwing the screw to the holding member. Fastening structure. The fastening structure for a member according to claim 1, wherein a notch groove is provided in a boundary portion between a shaft portion and a fastening portion of the screw.

Images