Locking structure

Abstract

To quickly perform disassembly work of a box body and a lid body fixed by a snap fit.SOLUTION: A locking structure is formed in a fitting portion 122 and includes a claw portion 101 protruding from an outer circumferential surface 123 of the fitting portion 122, and the claw portion 101 includes an inclined surface 102 that becomes thinner the further away from a head portion 121, and a recessed portion 103 formed in the inclined surface 102. The recessed portion 103 also includes a bottom surface 104 that is inclined with respect to the outer circumferential surface 123 so as to approach the outer circumferential surface 123 from the entrance portion to the back. The recessed portion 103 includes a vertical surface 105 adjacent to the bottom surface 104 and perpendicular to the outer circumferential surface 123.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a snap-fit ​​locking structure. [Background technology]

[0002] For example, control systems using control devices and equipment management devices are used to monitor and control various facilities attached to buildings and plants. The control system exchanges signals with field devices such as process equipment and various sensors installed at the site and connected via a network. In such control systems, there are a large number of devices (control devices) to be controlled and monitored.

[0003] For the above-mentioned control, a modular control device is used that is composed of a device main body and a terminal block to which the device main body is detachably attached (Patent Document 1, Patent Document 2). The module used in this type of control device houses a control circuit board in a housing. In addition, in order to facilitate repair, replacement, recycling, etc. of the control circuit board, the housing is made disassembleable by being composed of a box body and a lid body, and a snap fit is used to engage and fix the lid to the box body by engaging a claw portion provided on the lid body with an engagement portion provided on the box body.

[0004] When disassembling the box and lid that are engaged by a snap fit, the tab is pushed into the engagement part of the box to release the locked state and pull off the lid. A tool such as a flat-head screwdriver is used to push in the tab. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-282665 A [Patent Document 2] JP 2000-148214 A [Patent Document 3] Japanese Patent Application Publication No. 07-180711 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the claw portion of the snap fit has an inclined surface on the upper surface so that the lid can be easily inserted when fitting the lid to the box. On the other hand, in order to prevent the lid fitted to the box from being easily removed, the side surface of the engagement portion of the box is perpendicular to the inner peripheral surface of the box, and the portion where the claw portion engages with the engagement portion of the box is perpendicular to the inner peripheral surface of the box. Therefore, when the claw portion is pressed with a tool to separate the box and the lid, the surface against which the tool is pressed is an inclined surface, which makes it difficult to catch and slip, making it difficult to press. Therefore, there was a problem in the past that the box and the lid fixed by the snap fit could not be quickly disassembled.

[0007] The present invention has been made to solve the above-mentioned problems, and has an object to enable the box body and the lid body, which are fixed by a snap fit, to be quickly disassembled. [Means for solving the problem]

[0008] The locking structure of the present invention is a snap-fit ​​locking structure in which the fitting portion of a lid body having a head and a fitting portion fits and locks with the inner peripheral surface of the opening of a box body, and has a claw portion formed on the fitting portion and protruding from the outer peripheral surface of the fitting portion, and a slit formed at the opening end of the box body penetrating the side wall of the box body with which the claw portion engages from the inside, and the claw portion has an inclined surface that becomes thinner the further away from the head, and a recess formed in the inclined surface, and the recess has a bottom surface that is inclined with respect to the outer peripheral surface so that it approaches the outer peripheral surface from the entrance portion to the back, and an abutment surface provided adjacent to the bottom surface.

[0009] In one configuration example of the above-described locking structure, the abutment surface is a vertical surface that is perpendicular to the outer circumferential surface.

[0010] In one configuration example of the above-described locking structure, the abutment surface is a tapered surface that is not perpendicular to the outer circumferential surface. Effect of the Invention

[0011] As described above, according to the present invention, a recess is formed on the inclined surface of the claw portion and a sloped bottom surface is provided in the recess, so that disassembly of the box body and the lid body, which are fixed by a snap fit, can be carried out quickly. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a partial configuration of a locking structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing the configuration of a locking structure according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a perspective view showing a partial configuration of a locking structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A locking structure according to an embodiment of the present invention will be described below with reference to Figures 1, 2, and 3. As shown in Figure 3, this locking structure is a snap-fit ​​locking structure in which fitting portion 122 of lid 120, which has head 121 and fitting portion 122, fits and locks with the inner circumferential surface of the opening of box 130. Lid 120 and box 130 are made of, for example, engineering plastic.

[0014] This locking structure first includes claw portions 101 formed in fitting portion 122 and protruding from outer peripheral surface 123 of fitting portion 122. This locking structure also includes slits 131 formed at the open end of box body 130 penetrating the side wall of box body 130 and engaging with claw portions 101 from the inside. Claw portions 101 engage with side surfaces 132 of slits 131, which serve as engagement portions, whereby lid body 120 is locked to box body 130.

[0015] The claw portion 101 has an inclined surface 102 that becomes thinner the further away from the head portion 121, and a recess 103 formed in the inclined surface 102. The recess 103 also has a bottom surface 104 that is inclined with respect to the outer circumferential surface 123 so as to approach the outer circumferential surface 123 from the entrance portion to the back. The recess 103 also has an abutment surface 105 adjacent to the bottom surface 104. In the drawings, the abutment surface 105 is shown as a vertical surface perpendicular to the outer circumferential surface 123.

[0016] For example, by pressing the tip of a tool against recess 103 from the direction perpendicular to outer circumferential surface 123 toward the intersection of bottom surface 104 and abutment surface 105 to press in claw portion 101, the engagement of claw portion 101 with side surface 132 of slit 131 is released, and lid body 120 can be separated from box body 130. According to the embodiment, recess 103 is provided, so that the tip of the tool is less likely to slip.

[0017] In addition, because bottom surface 104 is inclined with respect to outer circumferential surface 123, the tip of the tool is less likely to come off from recess 103, and the structure is such that the tip of the tool naturally faces toward abutment surface 105. If bottom surface 104 were a surface parallel to outer circumferential surface 123, there is a possibility that the rear tip will slip and come off recess 103 due to a deviation in the angle at which the tip of the tool is inserted into recess 103. In contrast, by providing bottom surface 104, even if the angle at which the tip of the tool is inserted into recess 103 is slightly deviated, the tip can be prevented from coming off recess 103 because the direction in which the tip will slide is limited to the direction of abutment surface 105.

[0018] As described above, according to the embodiment, the claw portion 101 can be stably pressed in using a tool, and the work can be performed quickly.

[0019] As described above, according to the present invention, a recess is formed on the inclined surface of the claw portion and a sloped bottom surface is provided in the recess, thereby making it possible to quickly disassemble the box body and the lid body, which are fixed by a snap fit.

[0020] It is to be noted that the present invention is not limited to the above-described embodiment, and it is clear that many modifications and combinations can be implemented by a person having ordinary skill in the art within the technical concept of the present invention. As an example, the recess has been described as having a butting surface adjacent to the bottom surface and perpendicular to the outer circumferential surface, but a tapered surface having an angle that is not perpendicular to the outer circumferential surface may be provided as the butting surface. [Explanation of symbols]

[0021] 101...claw portion, 102...inclined surface, 103...recess, 104...bottom surface, 105...butting surface, 120...lid body, 121...head, 122...fitting portion, 123...outer peripheral surface, 130...box body, 131...slit, 132...side surface.

Claims

1. A locking structure using a snap fit in which a fitting portion of a lid body having a head portion and a fitting portion is fitted and locked to an inner peripheral surface of an opening of a box body, a claw portion formed on the fitting portion and protruding from an outer circumferential surface of the fitting portion; a slit formed at an open end of the box body so as to penetrate a side wall of the box body and into which the claw portion engages from the inside; having The claw portion includes an inclined surface that becomes thinner as it moves away from the head portion, and a recess formed in the inclined surface, The recess has a bottom surface that is inclined with respect to the outer circumferential surface so as to approach the outer circumferential surface from the entrance portion toward the back, and abutment surface provided adjacent to the bottom surface. Locking structure.

2. 2. The locking structure according to claim 1, The abutment surface is a vertical surface perpendicular to the outer circumferential surface.

3. 2. The locking structure according to claim 1, The abutting surface is a tapered surface that is not perpendicular to the outer circumferential surface.

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