JPH0440018Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a fixing screw receiving structure to a mounting plate of a box-shaped device, mainly a programmable controller.

[Conventional technology]

As a fixed screw receiving structure of this kind, for example, one is known in which a perspective view is shown in FIG. 2, and a structure and the number of combinations of fixed screw receiving structures that are normally provided are shown in FIG. In the figure, in order to attach the programmable controller 1 to the screw holes 2a of the mounting plate 2, the programmable controller 1 has two rectangular recesses 1a on each of the upper and lower side walls, with the recesses 1a facing from the front side to the back side. A penetrating mounting hole 1b is provided, and each of the recesses 1a has a tightening margin protruding from the rear side of the fixing screw 3.
A prismatic receiving piece 4, which is selectively used depending on the weight of the main body, is removably fitted. The fixing screw 3 and the receiving piece 4 can be selected from four types of combinations as shown in FIG. The four types of combinations shown in Fig. 3 include two types of fixing screws 3a, 3b and two types of receiving pieces 4a, 4.
Correspondence is planned with b.

[Problem that the invention attempts to solve]

In such conventional devices, it is necessary to change the amount of screw engagement between the mounting plate 2 and the fixing screw 3, that is, the tightening margin, due to the difference in weight of the programmable controller 1 and other reasons as described above. In this case, the four types of combinations for the reference level L (center position of the length of each receiving piece 4a, 4b) shown in FIG. 3a and receiving piece 4b
There are fixing screws 3b and receiving pieces 4b (c), fixing screws 3a (d) and receiving pieces 4a, and selecting and adopting these means that it is difficult to determine and select them, including mistakes in selection. It takes a lot of time and has the disadvantage of increasing costs due to the increased amount of management due to the large number of parts in stock.

In this case, it may be possible to shorten the length of the receiving piece (for example, by cutting it at reference level L in Fig. 3) and use the receiving piece inverted, but if the receiving piece is made smaller, handling efficiency is poor, and Since the mechanical strength is weakened, there is a problem in that in order to change the tightening margin of the fixing screw depending on the difference in weight, it is necessary to prepare a receiving piece of the type shown in FIGS. 3a to 3d.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional method, reduce the number of parts, and reduce the number of parts to accommodate differences in the number of mounting points including the weight difference of box-shaped equipment. An object of the present invention is to provide a fixing screw receiving structure for a box-like device.

[Means for solving problems]

In order to achieve the above-mentioned purpose, this invention has at least two rectangular recesses provided in the outer circumferential side wall of a box-shaped device through which mounting holes extending from the front side to the back side pass through, and A fixation comprising a receiving piece that can be removably fitted and has a through hole through which the threaded part of the fixing screw inserted from the mounting hole passes, and a screw receiving surface for regulating the tightening margin with which the fixing screw abuts. In the screw receiving structure, screw receiving surfaces are provided at both ends of the through hole of the receiving piece in the axial direction at positions having different depths from the both ends.

[Effect]

By providing a single receiving piece with a plurality of functions having different tightening margins, component management becomes easier, assembly time is shortened, and the cost is reduced.

〔Example〕

Figure 1 shows an embodiment of the fixing screw receiving structure for box-shaped equipment according to this invention, in which a is a vertical cross-sectional view of the main part, and b and c are the same parts that can be combined simply by changing the tightening margin. FIG. 4 is a vertical cross-sectional view of a main part showing a state corresponding to the difference. In the figure, the difference between this embodiment and the conventional device is that screw receiving surfaces 5a and 5b having different depths are provided at both ends of the receiving piece 5, respectively. That is, if the reference level L is set at the center of the entire length C of the receiving piece 5, the screw receiving surface 5a is located at a distance d1 from the reference level L, and the screw receiving surface 5b is located at a distance d1 from the reference level L.
is at a distance d2 from the reference level L. and b,
By changing the direction of the receiving piece 5 and inserting it as shown in c, the amount of protrusion from the reference level L can be changed. Therefore, by using this receiving piece 5 (not shown) in the recess 1a of the programmable controller 1 in the conventional device shown in FIG. 2, the tightening margin between the mounting plate and the fixing screw 6 can be selected.

[Effect of idea]

According to this invention, by providing screw receiving surfaces with different depths on both sides of the through hole in the axial direction and providing a common through hole for fixing screws, the number of standing parts is reduced and parts management is facilitated. At the same time, it is possible to provide an inexpensive fixing screw receiving structure for box-shaped equipment that facilitates and shortens the selection of components during assembly, and the size of the receiving piece can be made relatively large. The strength of the piece is increased, and it is easy to handle and has good functionality.Furthermore, since the fixing screw passes through the receiving piece, there is no risk of it being lost when the box-shaped device is attached.

[Brief explanation of drawings]

Figures 1a, b, and c are diagrams showing an example of the fixing screw receiving structure for box-shaped equipment based on this invention. (a) is a longitudinal cross-sectional view of the main part, and b and c are views of different combinations of the same parts. Main part longitudinal sectional view, Figures 2 and 3 a, b,
c and (d) are diagrams showing an example of the fixed screw receiving structure of a conventional box-shaped device, Fig. 2 is a perspective view of the installation process, and Fig. 3 a, b, c, and d show the number of combinations of multiple parts. FIG. DESCRIPTION OF SYMBOLS 1... Programmable controller, 2... Mounting plate, 5... Receiving piece, 5a, 5b... Screw receiving surface, 6... Fixing screw.

Claims (1)

[Scope of utility model registration request] At least two or more rectangular recesses provided on the outer periphery of the box-shaped device and penetrated by mounting holes extending from the front side to the rear side; In a fixing screw receiving structure comprising a receiving piece having a through hole through which the threaded portion of the fixing screw passes through and a screw receiving surface against which the fixing screw comes into contact to regulate the tightening margin, the axial direction of the through hole of the receiving piece is 1. A fixed screw receiving structure for a box-shaped device, characterized in that screw receiving surfaces are provided at different depths from both ends of the box-shaped device.