JPH066716U - Plate screwing mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] When the plate material made of ductile material and other members are screwed, even if there is a gap in the mounting surface due to manufacturing error or assembly error, the plate material will be deformed. Allows tightening without. [Arrangement] Circular punched areas 3a, 3b having discontinuous portions 5a, 5b are formed around the screw holes on the plate surface 1 of the inner chassis. When there is a gap G between the plate surface 1 and the end surface of the support post 8, the head of the tightening screw 10 is inserted through the washer 9 in the process in which the fastening screw 10 is fastened to the support post 8. Although the engaging portion 4 is engaged and pressed to the support post 8 side, the discontinuous portions 5a and 5b generate elongation due to a large tensile stress and absorb all the deformation energy, and deform to the outside of the punching areas 3a and 3b. Don't spread.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention relates to a plate screw fixing mechanism, and is applied to a screw fixing portion when a plate member such as a chassis and other members are mounted, and the plate member is deformed due to a manufacturing error or an assembly error of the plate member or the member. The present invention relates to the configuration of the image-stopping portion for preventing the occurrence of damage.

[0002]

[Prior art]

 In electronic devices, etc., structures such as screwing between chassis and between the chassis and support posts are often used, but since chassis are manufactured by sheet metal processing, high processing accuracy cannot be demanded. Errors are likely to occur in the outer diameter size and the hole formation position. In addition, in the assembly process of electronic devices, etc., electronic parts such as printed circuit boards and heat sinks and mechanical parts such as support posts are screwed and fixed to the chassis and assembled, so the chassis is temporarily manufactured with high accuracy. However, there are many cases where distortion occurs at the assembly stage and the mounting positions do not match.

In consideration of such a situation, generally, a screw hole for fastening is formed larger than a standard hole diameter or is formed as a long hole so as to absorb the above-mentioned error and distortion and cause a trouble. I am trying to assemble without.

However, although the absorption of the error due to the screw hole is effective for the error in the plate surface direction of the plate material, the end surface of the support post and the chassis surface screwed in the direction perpendicular to the chassis and the chassis surface. If there is a gap between and, another solution is needed. For example, as shown in FIG. 3, when the inner chassis 52 laid inside the outer chassis 51 is supported by the support posts 54, both ends of the support posts 54 are screwed to the outer chassis 51 and the inner chassis 52, respectively. However, if an error occurs in the mounting position of the inner chassis 52 or the length of the support post 54 is insufficient, a gap G is formed between one end of the support post 54 and the inner chassis 52.

As a result, when the inner chassis 52 is fastened to the support posts 54 with the screws 55, the inner chassis 52 bends as shown in FIG. 4, and the mounting portion of the outer chassis 51 with respect to the inner chassis 52 is pulled inward. As a result, the plate surface of the outer chassis 51 bends inward. Then, such deformation of the chassis 51, 52 causes unnecessary stress in various places to cause cracks, causes an assembly error with respect to other parts, and impairs the aesthetic appearance of the chassis itself. It will be.

[0006]

[Problems to be solved by the device]

 By the way, as a solution to the problem caused by the gap G, it is possible to take measures such as remanufacturing the support post 54 or interposing a spacer having a thickness corresponding to the gap G, but the machining / assembly process becomes complicated. As a matter of course, this leads to an increase in cost.

On the other hand, the plate materials used for the chassis and the like are often thin plates of aluminum or iron and are relatively rich in ductility. Therefore, the present invention provides a screwing mechanism that does not cause distortion or deformation when the plate body is screwed by using the ductility of the plate body such as the chassis, and the above-mentioned inconvenience is caused without using a spacer or the like. It was created for the purpose of solving.

[0008]

[Means for Solving the Problems]

 The present invention is characterized in that, in the screw fixing portion of the plate made of ductile material, an arcuate punching area having a discontinuous portion is formed around the hole through which the fastening screw is inserted. It is related to the screwing mechanism.

[0009]

[Action]

 When the plate is screwed to another member with a gap, the head of the fastening screw engages with the plate formed inside the arc-shaped punching area outside the screw hole, Although the part is pressed to the other member side, since the arcuate punching region is discontinuous, the tensile stress due to the pressing concentrates on the discontinuous part, and the discontinuous part expands and deforms.

If there is no punching area, the plate body is bent or distorted. However, in the present invention, the discontinuity extends to absorb all the energy that causes the bending or distortion. In other words, the discontinuous portion plays a role of preventing flexure and distortion from spreading to the outside of the arcuate punching area due to the local deformation. The number and the width of the discontinuous portions formed between the arcuate punching regions are arbitrary, and are set according to the thickness of the plate and the properties of the material.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 2 shows an enlarged plan view (A) of the screwed portion of the inner chassis, and a cross-sectional view (B) and a cross-sectional view (C) taken along line X-X thereof. In the figure, 1 is a plate surface of an aluminum chassis, and a hole 2 through which a tightening screw is inserted is punched out at a screwing position of the aluminum chassis, and two arcuate shapes around the hole 2 are formed around the hole 2. Punching regions 3a and 3b are formed.

Here, the punching regions 3a and 3b are formed at symmetrical positions with respect to the center of the hole 2, and the radius R of the inner arc is slightly larger than the radius of the head of the fastening screw. ing. Therefore, an engaging portion 4 for engaging with the head of the fastening screw is formed between the hole 2 and the punching areas 3a, 3b, and a discontinuous portion is provided at the facing portion of the end of each punching area 3a, 3b. 5a and 5b are configured. In other words, the discontinuous portions 5a and 5b connect the portion of the plate surface 1 outside the punched areas 3a and 3b and the engaging portion 4, and the discontinuous portions 5a and 5b are flat beams (width W × As a thickness of the plate surface 1), the engaging portion 4 is supported from both sides.

As shown in FIG. 1, the inner chassis has side bent portions fixed to the outer chassis 7 by screwing, and the plate surface 1 of the inner chassis is vertically oriented as in the case shown in FIG. It is adapted to be screwed to the end face of the upright support post 8. Also in this case, as in the case of FIG. 3, it is assumed that a gap G is formed between the plate surface 1 and the end surface of the support post 8. Insert the fastening screw 10 through the washer 9 into the hole 2 on the plate surface 1, and screw the male screw part into the female screw hole 8a of the support post 8. It engages with the engaging portion 4 of the plate surface 1 via 9 and the engaging portion 4 is pressed toward the support post 8 side by screw-in fastening.

In this fastening process, the engaging portion 4 is pushed down, so that a very large tensile stress (in the direction of the arrow in FIG. 1) is generated in the discontinuous portions 5a and 5b of the punched regions 3a and 3b. Therefore, the discontinuous portions 5a and 5b of the plate surface 1 made of aluminum easily yield and grow, and at the stage when the fastening is completed, the discontinuous portions 5a and 5b are stretched as shown in FIG. Therefore, the morphology is in a bent state, and the engaging portion 4 comes into close contact with the end surface of the support post 8 to fix the plate surface 1 of the inner chassis.

Then, all the energy due to the stress generated in the discontinuous portions 5a, 5b is canceled by the elongation, the stress does not spread to the outside of the punched regions 3a, 3b, and naturally the plate surface of the outside region is No distortion or deformation. That is, in this case, the presence of the gap G necessitates an unreasonable mounting of the inner chassis, and without the punching regions 3a and 3b, the entire plate surface 1 is distorted or deformed, and as shown in FIG. However, in the present embodiment, the discontinuities 5a and 5b absorb all the stress energy that causes these deformations, and the strain and deformation are retained inside the punched regions 3a and 3b. There is.

In this embodiment, the punching regions 3a and 3b are symmetrically formed at two positions to form two discontinuous portions 5a and 5b. However, when the chassis is thin, the punching regions are four. It is also possible to adopt a structure in which there are four discontinuous parts at each location. Conversely, when the plate thickness is large or the material is iron and the yield point is high, the width W of the discontinuous parts 5a, 5b can be set. The stress generated during tightening can be increased by narrowing it. Further, stress concentration tends to occur in each corner portion of the punched areas 3a and 3b, but by forming the portion in an arc shape, it is possible to prevent the occurrence of cracks due to the stress concentration.

[0017]

[Effect of device]

 The plate screw fixing mechanism of the present invention has the following effects due to the above configuration. When a plate made of ductile material is screwed to another member, even if there is a gap between the plate and the member facing each other, the deformation of the plate is localized in the local area around the screwed position (arc shape). It is possible to limit the deformation to other areas and members, within the punching area of (). Especially when applied to parts such as electronic equipment chassis and support posts and screwed parts between chassis, it is necessary to add spacers and rework even if manufacturing errors or assembly errors occur in those parts. Eliminates the need for a smooth assembly process and reduces costs.

[Brief description of drawings]

FIG. 1 is a cross-sectional view and a plan view of relevant parts showing a state in which an inner chassis to which a plate screwing mechanism of the present invention is applied is screwed to a support post.

FIG. 2 is an enlarged plan view of a screw fixing portion of the inner chassis.
(A) and the XX arrow sectional view (B) and the YY arrow sectional view (C).

FIG. 3 is a cross-sectional view showing a step (before tightening) of screwing an inner chassis to a support post according to a conventional technique.

FIG. 4 is a cross-sectional view showing a step (after fastening) of screwing a support post of an inner chassis to a conventional technique.

[Explanation of symbols]

1 ... Plate surface, 2 ... Hole for inserting fastening screw, 3a, 3b ... Punching area, 4 ... Engagement portion with fastening screw head, 5a, 5b ... Discontinuous portion of punching area, 7 ... Outside Chassis, 8 ... Support post, 8a
… Female screw holes in support posts, 9… Washers, 10… Fastening screws, G… Gap, R… Radius of inner arc of punching area, W… Width of discontinuity.

Claims (1)

[Scope of utility model registration request] 1. A screw of a plate body, which is formed of a ductile material, wherein an arcuate punching region having a discontinuous portion is formed around a hole through which a fastening screw is inserted. Stop mechanism.