JPH0119783Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a side plate mounting structure for firmly fixing a side plate that closes an electronic component or the like to an open end of a frame.

An example of this type of electronic component is a rotary switch as shown in FIGS. 1 and 2. As shown in FIG. 1, this rotary switch includes a frame 1 formed by molding a metal plate. This frame body 1 includes a pair of side walls 1a, 1a, and an upper wall 1b.
and the inclined walls 1c, 1c between these, the cross-sectional shape is formed into a substantially inverted U-shape. As a result, element storage chambers 2 are formed within the frame 1, which are open at both longitudinal ends and at the lower end. In addition, a plurality of notches 3 for attaching an element are formed in the side wall 1a and open at the lower end, and a pair of locking claws 3a and 3b are protruded from the upper part of each of the notches 3, and the front and rear ends of the side wall 1a are Attachment legs 4 and 5 that extend downward are respectively provided in a protruding manner. Furthermore, a locking pawl 6 is provided protruding from the front end of the side wall 1a, and a locking pawl 7 is provided protruding from the front end of the slanted wall 1c.

8 is a switch element. This switch element 8
By rotating the central rotor 9, a movable contact (not shown) integrated with the rotor 9 is rotated.
This movable contact is made to sequentially contact a plurality of fixed contacts (not shown) arranged in an annular manner. In the figure, 10 is a terminal integrated with each fixed contact, 11 is a locking protrusion protruding from the side of the switch element 8, and 12 is a through hole with a rectangular cross section passing through the rotor 9. Each such switch element 8 is
Insert the upper part of the terminal 10 into the element storage chamber 2, fit the locking protrusion 11 between the locking claws 3a and 3b, and insert the tips of the locking claws 3a and 3b onto the lower surface of the locking protrusion 11. By caulking against the frame body 1
Fixed.

The prismatic portion 13a of the rotary operation shaft 13 is fitted into the through hole 12 of each switch element 8 fixed in this manner. A cam plate 14 is fixed to the rotary operation shaft 13, and positioning recesses 14a are opened at equal pitches in the circumferential direction on the front surface of the cam plate 14. Further, 15 is a ball for positioning, 16 is a spring for biasing the ball, and 17 is a front side plate for closing the front opening end of the element storage chamber 2. This front plate 17
Claw engaging grooves 18 and 19 that are open to the front and rear surfaces are respectively formed on the side surfaces and slopes of the front plate 17.
A shaft insertion hole 20 is formed in the center of the shaft. Note that after inserting the front end of the rotary operation shaft 13 into this shaft insertion hole 20 from the rear side of the front side plate 17 and making it protrude to the front side, insert the circlip 2 into the groove 21 of this protrusion.
2, the front side plate 17 and the rotary operation shaft 13 are assembled to each other such that they can freely rotate relative to each other and cannot be detached from each other. The above-mentioned spring 16 and ball 15 are interposed in series between the front side plate 17 and the cam plate 14, and the ball 15 is pressed against the front peripheral edge of the cam plate 14 by the spring force of the spring 16. It will be done.

Moreover, the locking claws 6 and 7 of the frame body 1 are respectively engaged with the claw engaging grooves 18 and 19 of the front side plate 17, and the tips of the locking claws 6 and 7 are caulked against the front surface of the front side plate 17. By bending (bending), the front side plate 17 is fixed to the open end of the frame body 1 as shown in FIG. 2, and the front end opening of the element storage chamber 2 is closed (FIGS. 3 and 4). reference).

However, when the tips of the locking claws 6, 7 are caulked, the intermediate portions of the locking claws 6, 7 receive compressive force, so the direction in which the locking claws 6, 7 move away from the side surface or slope of the front plate 17 is side walls 1a, 1 of frame body 1.
There was a problem in that the fixing strength between the front plate 17 and the frame 1 due to the locking claws 6 and 7 gradually decreased as the portions a expanded in the direction away from each other. Moreover, side wall 1
If a, la were expanded, dimensional accuracy would not be achieved, and there was a risk that attachment of the rotary switch to a board or the like would be hindered.

Therefore, this invention prevents the middle part of the locking pawl from bulging due to caulking of the tip of the locking pawl, thereby preventing the side wall of the frame from expanding, and also prevents the side wall of the frame from expanding due to the caulking of the tip of the locking pawl. It is an object of the present invention to provide a structure for attaching a side plate to an open end of a frame body with improved fixing strength.

In order to achieve this object, this invention forms a wide groove part at the frame side end of the pawl engaging groove, and forms each side surface of the pawl engaging groove and the step of the wide groove part at the middle both sides of the pawl engaging groove. side grooves opening in the surfaces, a wide part provided at the base of the locking pawl is fitted into the wide groove, and bulge prevention pieces provided on both intermediate sides of the locking pawl are fitted into the side groove. It is characterized by a side plate attachment structure to the open end of the inserted frame.

This invention will be explained below based on FIGS. 5 to 8. In this description, parts or members that are the same as or equivalent to those of the prior art are given the same reference numerals and redundant description will be omitted.

In FIG. 5, a wide groove part 23 is formed at the end of the claw engaging groove 18 on the side of the frame 1, and side faces 18a, 18a and a wide groove part 2 are formed at the middle both sides of the claw engaging groove 18.
Side grooves 24, 24 which are open to the step surface 23a of No. 3 are formed. Further, a protrusion 25 extending in the longitudinal direction of the pawl engaging groove 18 is provided in a protruding manner at the bottom of the pawl engaging groove 18 . Although the pawl engaging groove 18 extends to the front surface of the front side plate 17 as shown in FIG. 1, the protrusion 25 does not extend to this extended portion.

Further, a wide portion 26 is formed at the base of the locking claw 6, and bulge prevention pieces 27 are formed at the middle both sides of the locking claw 6.
27 are integrally formed. Each bulge prevention piece 27
a curved portion 27a that curves toward the element storage chamber 2;
An engaging portion 27b is provided which is connected to the tip of the curved portion 27a and extends parallel to the intermediate portion of the locking claw 6.

The wide part 26 of the locking pawl 6 is fitted into the wide groove part 23 of the pawl engaging groove 18 as shown in FIG. 24, and the intermediate portion 6a of the locking pawl 6 is supported by the protrusion 25. Note that the tip of the locking pawl 6 is caulked to the front surface of the front side plate 17 as in FIG. 1, and is fitted into the end of a pawl engaging groove 18 extending to the front surface.

Next, the function of the structure for attaching the side plate to the open end of the frame having such a configuration will be explained.

Here, if the direction extending in the front and rear surfaces of the front side plate 17 is the X direction, the width direction of the pawl engaging groove 18 is the Y direction, and the direction perpendicular to the side surface of the front side plate 17 is the Z direction, then the X direction of the locking pawl 6 is Positioning in the Y direction is performed by the end surface 26a of the wide portion 26 of the locking pawl 6 and the stepped surface 23a of the pawl engaging groove 18, and positioning of the locking pawl 6 in the Y direction is performed by the wide portion 26 of the locking pawl 6. 26 side surfaces 26b, 26b and side surfaces 23b, 23 of the wide groove portion 23 of the claw engaging groove 18
Positioning of the locking pawl 6 in the Z direction and prevention of bulging deformation are performed by the bulge prevention piece 27 of the locking pawl 6 and the side groove 24 on the side of the pawl engaging groove 18.

Therefore, as shown in FIGS. 6 and 7, when the tip of the locking claw 6 is caulked against the front surface of the front plate 17 with the locking claw 6 fitted into the claw engaging groove 18, , even if compressive force is applied to the intermediate portion of the locking pawl 6, the locking pawl 6
The bulge of the intermediate portion 6a is caused by the bulge prevention piece 27 and the side groove 24.
Therefore, the side walls 1a, 1a of the frame body 1 will not expand during this caulking. Moreover, since the outer surface of the locking pawl 6 engaged in this manner is flush with the outer surface of the front plate 17, the appearance is not spoiled due to a step on the mating surface.

In the embodiment described above, the intermediate portion 6 of the locking pawl 6
Although an example has been shown in which the locking pawl 6 is fitted into the pawl engaging groove 18 by forming the pawl a flat in advance, it is not necessary to do so. For example, by bulging out the intermediate portion 6a of the locking pawl 6 in an arc shape as shown by the broken line in FIG.
The intermediate portion 6a may be formed flat as shown by the solid line. In this case, the bulge prevention pieces 27, 27 are deformed upward in FIG. While being brought into elastic contact with the upper surface, the intermediate portion 6a is brought into elastic contact with the protrusion 25.
As a result, the locking pawl 6 is fixed to the pawl engaging groove 18 more firmly than in the embodiment shown in FIGS. 5 and 6. The structure of this invention can also be applied to volumes and other electronic components.

As explained above, in this invention, a wide groove is formed at the frame side end of the pawl engaging groove, and each side surface of the pawl engaging groove and the stepped surface of the wide groove are formed on both intermediate sides of the pawl engaging groove. forming side grooves that open to each side, fitting a wide portion provided at the base of the locking pawl into the wide groove, and inserting bulge prevention pieces provided on both intermediate sides of the locking pawl into the side groove; Since the side plate is attached to the open end of the frame body, it is possible to reliably prevent the middle part of the locking pawl from bulging due to caulking of the tip of the locking pawl.
It is possible to prevent the side walls of the frame from expanding, and to improve the strength of fixing the frame and the front plate by the locking claws.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional rotary switch, Figure 2 is a partial perspective view of a conventional rotary switch, Figure 3 is an enlarged perspective view of a part of Figure 2 seen from a different angle, and Figure 4. is a cross-sectional view taken along the - line in FIG. 3, FIG. 5 is an exploded perspective view of the side plate mounting structure according to this invention, FIG. 6 is an assembled perspective view of each part shown in FIG. 5, and FIG. A cross-sectional view along the - line in Figure 6,
FIG. 8 is an explanatory view showing another example of assembly of this invention. DESCRIPTION OF SYMBOLS 1... Frame body, 1a... Side wall, 6... Locking claw, 17... Front side plate, 18... Claw engaging groove, 18a... Side surface, 23... Wide groove part, 23a... Step surface, 24... Side groove, 26... Wide width part, 27...Bulge prevention piece.

Claims (1)

[Claim for Utility Model Registration] The side opening end of a frame body having an inverted U-shaped cross section is closed with a side plate, and claw engaging grooves opening on the front and rear sides are formed on the side plate of the side plate. A locking pawl that engages with the pawl engagement groove and whose tip protrudes toward the front side of the side plate is integrally formed on the edge of the opening end of the frame, and the tip of the locking pawl is connected to the front side of the side plate. In the structure for attaching the side plate to the open end of the frame body, the side plate is fixed to the frame body by bending the side plate against the frame body, and a wide groove portion is formed at the frame body side end of the claw engaging groove; Side grooves are formed in the intermediate both sides of the pawl engaging groove and open to each side surface of the pawl engaging groove and the stepped surface of the wide groove, and a wide portion provided at the base of the locking pawl is fitted into the wide groove. A structure for attaching a side plate to an open end of a frame body, characterized in that a bulge prevention piece provided on both intermediate sides of the locking pawl is inserted into the side groove.