JPS5821124B2 - Instrument parts fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for fixing parts of a fixture such as a lighting fixture.

Generally, methods such as screwing and caulking are used when attaching and fixing parts of electrical appliances, but methods such as caulking are preferable on the premise that the assembly of electric appliances is to be automated.

By the way, in the case of automation, the dimensional accuracy of each component and the accuracy of the fitting pitch are naturally required, and these accuracy needs to be increased in proportion to the number of fitting points.

On the other hand, in order to make it easier to fit parts together, the fitting gap can be made larger, but in electrical appliances such as sealed insect-proof lighting equipment, for example, in order to maintain insect-proof performance, it is necessary to make the fitting gap 0.3 If there is a gap of mm or more, it cannot fulfill its role.

Fig. 1 shows a conventional method for fixing components by caulking.When a fitting hole 2 is drilled in a component 3, a cut-and-raised pawl 4 is provided on the mounting component 1 side, and in the process, The raising claw 4 is fitted into the fitting hole 2 from above as shown in FIG. 2a.

FIG. 2 shows this state, and from this state, the tip of the cut-and-raised claw 4 passing downward through the fitting hole 2 is bent as shown in FIG. 2C and tightened and fixed.

Further, as shown in Fig. 3, a round hole 5 with a burring 6 formed on the opening edge is formed in the mounting part 1, and a round hole T is bored in another part 3, and in this process, as shown in Fig. 4a. The bur ring 6 is fitted into the round hole 7 from above.

FIG. 4 shows this state, and from this state, the bur ring 6 protruding downward from the round hole 7 is caulked and fixed outward as shown in FIG. 4C.

By the way, in the case of the conventional example shown in FIG. 1, the gap l between the caulked cut-and-raised claw 4 and the fitting hole 2 shown in FIG. Yes, but
When fitting a large number of parts using an automatic machine, the fitting gap between each part needs to be large, which poses a problem in that insect-proofing performance cannot be ensured.

On the other hand, in the case of the conventional example shown in Fig. 3, the round hole 5 of φl' is open, so in order to ensure the insect repellent performance, it is necessary to add another part in post-processing to close the round hole 5, which requires a large number of man-hours. There was a drawback.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to provide a structure for fixing parts of a device which can be caulked by an automatic machine and which has excellent insect repellent performance.

The present invention will be explained below with reference to Examples.

Figure 5a. b shows a mounting part 1' such as a socket base used for an electric appliance such as a fluorescent lighting fixture, and this mounting part 1' is a horizontal piece 8a of a sheet metal board 8 that can be bent into an abbreviated shape. Cut-and-raise claws 4 for caulking are cut and raised downward on both sides of the body.

Further, a socket 10 is fixed to the vertical piece 8b.

One solution 6, Figures a and b, is a sheet metal part 3' such as a fixing base for fixing the mounting part 1', and the cut-out claw 4 provided on the mounting part 1 is inserted into this part 3'. Fitting hole 2 for
' is provided.

As shown in FIG. 7, this fitting hole 2' has a piece 9 cut and raised downward on one side of the opening edge.

Therefore, the fitting dimension can be set larger by the difference Δ1 between the tip of the cut and raised piece 9 and the original opening edge of the fitting hole 2'.

Therefore, when fixing the mounting part 1' by caulking, an automatic machine is used to cut and raise the claw 4 of the mounting part 1' from the state shown in Fig. 8a.
from above the fitting hole 2' of the component 3' as shown in Figure 8C, and then cut and raise the piece 9 as shown in Figure 8C.
2', and the tips of the protruding pawls 4 protruding downward from the fitting hole 2' are caulked and fixed so as to come into pressure contact with the protruding pieces 9 on the opening edge of the fitting hole 2.

Therefore, in this caulked state, the gap can be suppressed to 0.3 mm or less, and insect repellent performance can be ensured.

Furthermore, as shown in an enlarged view in FIG. 9, after the cut-and-raised piece 9 is crimped and returned, the tip of the cut-and-raised claw 4 is crimped so as to press against the lower surface of this cut-and-raised piece 9, so that the cut-and-raised piece 9 can be easily removed. The elastic recovery force (springback) F of piece 9 acts, and the caulking strength is 8th.
This is stronger than in the case of Figure C.

Of course, as shown in FIG. 10, both sides of the opening edge of the fitting hole 2' may be cut and raised downward to provide cut and raised pieces 9 on both sides.

In this case, the fitting dimension can be widened by the difference size 2Δl' on both sides, making it easier to fit by an automatic machine.

The present invention has a fitting hole in which the cut-and-raised pawl of the mounting part is fitted and the tip of the cut-and-raised pawl is caulked and fixed to the opening edge, and one side or both sides of the opening edge of the fitting hole is cut out and the nail is fixed. A cut-and-raised piece formed by cutting and raising in the fitting direction and returning to the original position when the cut-and-raised pawl is fixed by caulking is provided on another part to which the mounting part is attached. When fitting into the fitting hole, the cutting and bending piece can be cut and bent. Therefore, the cutting and bending piece can be cut and bent in a state that is larger than the original diameter of the fitting hole, that is, fitting. Since the fitting was done with large dimensions, an automatic machine was used for fitting, and by returning the cut and raised piece to its original state, the fitting gap after crimping and fixing could be reduced.
For example, it is possible to secure the insect repellent performance by keeping the size to 0.3 mm or less.Furthermore, cut-and-raised nails are attached to the edge of the cut-and-raised piece that has been returned to its original position. Since it is fixed by caulking, the caulking strength of the cut and raised nails can be increased by the action of the elastic recovery force of the cut and raised pieces.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is an assembly explanatory view of the same as above, Fig. 3 is a perspective view of another conventional example, Fig. 4 a
-C are assembly explanatory diagrams of the same as above, FIGS. 5a and 5b are side views and rear views of attachment parts of an embodiment of the present invention, and FIGS. 6a and b are top views and sectional views of the same parts, FIG. 7 is an enlarged sectional view of the fitting hole portion same as above, FIGS. 8 a to C are assembly explanatory views of same as above, FIG. 9 is an enlarged sectional view of FIG. It is an enlarged cross-sectional view of the fitting hole [portion] of the embodiment, and 1' is a mounting part;
2' is a fitting hole, 3' is a component, 4 is a cutting claw, and 9 is a cutting piece.

Claims (1)

[Claims] 1. A fitting hole in which a cut-and-raised claw is provided protrudingly on the mounting part, and the tip of the cut-and-raised claw is fitted into the hole and the tip of the cut-and-raised claw is caulked to the opening edge, and one side of the opening edge of the fitting hole. or a cut-and-raised piece formed by cutting and bending both sides in the direction in which the nail is fitted, and returning to the original position when the cut-and-raised nail is fixed by caulking, is provided on another part to which the mounting part is attached. A component fixing structure for an instrument, characterized in that the cut-and-raise claw is inserted into a fitting hole and fixed by caulking the cut-and-raise claw to the edge of the cut-and-raise piece that is returned to its original position.