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Fastening body structure

A solid structure and fastening technology, applied to threaded fasteners, fixing devices, connecting components, etc., can solve problems such as difficult to achieve fastening purposes, achieve reliable and firm fastening, and easy disassembly operations

Inactive Publication Date: 2010-11-10
TOKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, when the screw is rotated and screwed in, the washer receiving portion expands in the direction in which the inner diameter of the washer becomes larger than the outer diameter of the head of the screw, making fastening difficult.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0067] A steel plate with a length of 80 mm x a width of 30 mm x a thickness of 10 mm made of quenched steel equivalent to S45C was prepared in advance, and the following holes were drilled at 10 positions on the steel plate at equal intervals as a test piece. Apertures are provided on the upper part of this steel plate up to a depth of 4mm The countersink hole, and process the M4.0 internal thread at the lower part of the countersink hole. For module screw 2, such as image 3 As shown in (a) and (b), the concavo-convex part 5 is formed on the lower surface of the head part 2a with a length of 6.5 mm and an inclination angle of 20 degrees (sunk head angle 140 degrees) by knurling. At this time, the number of convex portions 5 a in the circumferential direction on the head lower surface of the module screw 2 was 36, and the height h1 of the convex portions 5 a was 0.1 mm. In addition, the diameter of the step part (shank part) of the module screw 2 is 5 mm, and the module sc...

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Abstract

A fastening body structure having a screw member which uses a module screw having a countersunk head and also uses, together with the module screw, a washer made of a shape memory alloy. With this structure, the washer does not expand even if subjected to large fastening force in fastening of a part to be fastened and in which the washer can be easily removed when the screw fastening is released. The fastening body structure (1) fastens and fixes a desired part (10) to the installation section (20) by using the screw member (4) having the module screw (2) and the shape memory alloy washer (3). The module screw (2) has a male screw (2d) used as a pair with a female screw thread section (21) formed in the installation section (20), and also has the countersunk head (2a). The shape memory alloy washer (3) has an inner diameter corresponding to the module screw. An irregular surface section (5,(50)) is formed on a slope surface at the lower part of the head of the module screw or on that surface of the washer which makes contact with the screw.

Description

technical field [0001] The present invention relates to a fastening body structure using a washer made of a shape memory alloy and a screw, and the fastening body structure is applied to air conditioners, washing machines, refrigerators, televisions, battery packs, simple chargers, etc., and can be easily disassembled so that they can be used again In the manufacture of its constituent parts, accessories, or products using materials, it is effective in the dismantling of the product. Background technique [0002] Generally, when disassembling a screw-fixed product, conventionally, an operation of loosening the screw of the product and removing the screw has been performed manually. Recently, there has been progress in the development of a technology to achieve easy disassembly by using a shape memory alloy washer in combination with a screw during fastening, and this method is also attracting attention in terms of recycle use of parts and recovery of resources. [0003] Suc...

Claims

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Application Information

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IPC IPC(8): F16B35/00F16B43/00
CPCF16B35/06F16B1/0014F16B43/00F16B2200/77
Inventor 吉田一也中西正洋
Owner TOKAI UNIV
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