JP3493798B2 - Combination device for plate-shaped parts and compression coil springs - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a compression coil spring and a plate-like component used in a spring biasing mechanism of a general industrial product. FIG. 9 is a sectional view schematically showing a conventional assembly structure of a plate-shaped part and a compression coil spring. In the figure, a compression coil spring 1 having an end winding portion 1A at an end is supported with one end inserted into a recess 3A of another component 3. Further, the plate-shaped component 2 is provided with, for example, a hemispherical projection 4 having a diameter smaller than the inner diameter of the compression coil spring 1, and the other end of the compression coil spring 1 is mounted so as to surround the projection 4 from the outside. Accordingly, the movement of the compression coil spring 1 in the direction along the surface of the plate-like component 2 is restricted by the hemispherical projection 4. In the conventional assembly structure of the plate-shaped component and the compression coil spring configured as described above, a constraint force is generated at both ends of the compression coil spring 1 only when a compression load is applied to the compression coil spring 1. is there. Therefore, it is necessary to insert the compression coil spring 1 into the gap between the components 2 and 3 while holding the compression coil spring 1 in a compressed state to some extent. However,
The elasticity of the compression coil spring gripped by the tool causes the workability to drop, such as detaching from the tool and jumping in an unexpected direction.In addition, the extremely small compression coil spring is not only difficult to grip with the tool itself. Otherwise, the compression coil spring is deformed by the gripping, and a problem occurs that the spring characteristic is deteriorated. In view of this, there have been proposed some coupling devices of a plate-shaped component and a compression coil spring which can perform an assembling operation efficiently without directly grasping the compression coil spring. FIGS. 10A and 10B show a conventional coupling device of a plate-shaped component and a compression coil spring, wherein FIG. 10A is a plan view and FIG. 10B is a side sectional view. In the figure, a compression coil spring 1 has a small-diameter portion 1B in which the diameter of the movable end is reduced, and the small-diameter portion 1B is fitted into a rivet 6 inserted into a rivet hole of the plate-shaped component 2, and when the rivet 6 is crimped. The small-diameter portion 1B is configured to be caulked to the plate-shaped component 2 via the rivet 6, and a coupling device for a cam switch using the plate-shaped component 2 as a movable switch plate and the rivet 6 as a rivet contact is disclosed in Japanese Utility Model Application Publication No.
No. 97833 proposes this. FIG. 11 is a cross-sectional view showing a different conventional coupling device between a plate-shaped component and a compression coil spring. In the figure, an annular projection 7 is formed on a plate-shaped component 2 by a bossing process,
The end turn portion 1A of the compression coil spring 1 is press-fitted into the annular projection 7 to constitute a coupling device between the plate-shaped component 2 and the compression coil spring 1. FIGS. 12A and 12B show still another conventional coupling device of a plate-shaped component and a compression coil spring, wherein FIG. 12A is a plan view and FIG. 12B is a side sectional view. In the drawing, after the plate-shaped component 2 is punched in a punching area 2B indicated by a broken line while leaving a plurality of tongues 2C, the plurality of tongues 2C are bent and raised, and the bent tongues 2C are removed. The coupling device of the plate-shaped component 2 and the compression coil spring 1 is constituted by inserting the end winding portion 1A of the compression coil spring 1 so as to surround it and bending the tongue-shaped portion 2C outward to restrain the end winding portion 1A. are doing. FIG. 13 is a cross-sectional view showing another conventional coupling device for connecting a plate-shaped component and a compression coil spring. In the figure, a screw 9 passing through the plate-shaped part 2 is used as a connecting member, and several turns of the end portion of the compression coil spring 1 are screwed along the thread of the screw 9, whereby a connecting device for the plate-shaped part 2 and the compression coil spring 1 is formed. Make up. In the prior art shown in FIGS. 10 to 13, since the compression coil spring 1 can be connected to the plate-like component 2 by a coupling device and supplied as an integrated component, this component is used. When mounting on a narrow spring biasing mechanism of a general industrial product, a plate-like component can be pinched and mounted. For this reason, it is possible to avoid a decrease in workability, which is a problem in the conventional assembling method shown in FIG. 9, and to avoid deformation of the compression coil spring due to gripping of the compression coil spring, thereby avoiding a decrease in spring characteristics. can get. Further, in the conventional example shown in FIG. 10, since the rivet contact 6 is also used as a connecting member to constitute a connecting device of the movable switch plate 2 and the compression coil spring 1, the number of parts of the cam switch can be reduced. Benefits are obtained. However, since the small-diameter portion 1B of the compression coil spring is interposed in the caulked portion of the rivet contact 6, there is a possibility that caulking is restricted, and as a result, the conductive contact performance between the movable switch plate and the rivet contact is impaired. There is a possibility of stabilization. Further, since the end of the compression coil spring is fixed to the movable switch plate, there is a concern that the spring characteristics of the compression coil spring will be adversely affected. Further, FIG. 11 to FIG.
Also in the conventional example shown in FIG. 3, since the end of the compression coil spring 1 is fixed to the plate-shaped component 2, there is a concern that the spring characteristics of the compression coil spring may be adversely affected. SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling device which can be coupled to a plate-like component without fixing an end turn portion of a compression coil spring, and therefore has little adverse effect on spring characteristics. [0010] In order to solve the above-mentioned problems, according to the first aspect of the present invention, a plate-like component is provided in a case of a switchgear supporting a fixed contact, and a movable contact is provided. Is supported on one surface side, and is spring-biased toward a fixed contact by a compression coil spring having an end winding portion at an end portion. A part of the movable member support plate is A connecting plate portion bent substantially vertically to the side, an inclined portion formed at the front end of the connecting plate portion so as to be convex at the center thereof, and the compression coil spring as an extension at both ends of the inclined portion. A hook portion formed to be convex on the side, and an end winding portion storage groove formed in a U-shape between the hook portion and the surface of the mover support plate to loosely support the end winding portion from its inner diameter side. Is provided. According to the first aspect of the present invention, the movable element is provided in the case of the switching device that supports the fixed contact with the plate-shaped component and supports the movable contact on one surface side. Since the supporting plate is used, the movable contact is evenly biased toward the fixed contact by the compression coil spring which loosely supports the end winding portion in the end winding portion storage groove from the inner diameter side thereof. A conductive contact state can be obtained, and the movable element support plate can be picked up with a tool and inserted between the case of the switchgear and the fixed contact together with the compression coil spring and the movable contact integrated with the mover support plate. The assembly work can be labor-saving, and the assembling work can be performed without deforming the compression coil spring. Hereinafter, the present invention will be described based on embodiments.
Members having the same reference numerals as those of the conventional example have the same functions as those of the conventional example, and the description thereof will be omitted. FIGS. 1A and 1B show an embodiment of a connecting device for a plate-shaped component and a compression coil spring according to the present invention, wherein FIG. 1A is a plan view, and FIG.
It is sectional drawing in a position. In the figure, a plate-like component 2 is provided with a pair of coupling plate portions 12 formed by bending a part of the plate-like component almost vertically to one surface side. This pair of coupling plate portions 12
Has an inclined portion 15 formed in a trapezoidal triangular shape so as to be convex at the center thereof. Also, this inclined portion 1
5 has a pair of hooks 13 as extensions thereof.
Is provided. Further, between the hook portion 13 and the surface of the plate-shaped component 2 is provided an end winding portion storage groove 14 formed as a U-shaped concave groove. On the other hand, in the compression coil spring 1 showing only the end turn 1A of one turn in FIG.
The second slant portion 15 gets over the hook portion 13 and drops into the end winding portion storage groove 14. At this time, the tip 13A of each of the four hook portions 13 of the pair of coupling plate portions 12 is provided.
The protrusion size of the hook portion 13 is determined so that the diameter of the envelope circle connecting the hooks 13 is larger than the average diameter of the end turn portion 1A, so that the end turn once dropped into the U-shaped end turn storage groove 14 is formed. The portion 1A does not fall off again, and the compression coil spring 1 is prevented from falling off. Therefore, when incorporating the compression coil spring into the spring biasing mechanism of general industrial products,
The plate-like component 2 can be picked up by a tool to perform an assembling operation, and an advantage can be obtained that a reduction in working efficiency due to a failure to grasp the compression coil spring 1 and a reduction in spring characteristics due to deformation of the spring can be eliminated. The diameter of a circumscribed circle (envelope circle) connecting the bottom edges 14A of the four end winding section storage grooves 14 is made slightly smaller than the inner diameter of the end winding section 1A. By making the opening width h slightly larger than the height d of the end turn portion 1A, the end turn portion 1 dropped into the end turn portion storage groove 14 is formed.
A is loosely positioned so as to be rotatable while maintaining a small gap between the coupling coil portion 12 and the compression coil spring 1A when the end winding portion 1A is restrained or fixed to the plate-shaped component 2. 1 can be avoided, and for example, the plate-like component 2 can be stably biased by spring. In this embodiment, the inclined portion 15 is formed in a triangular shape having _a pair of right and left inclination angles θ _a and θ _b different from each other to increase the length of the inclined surface on the θ _a side where the inclination angle is large. did.
Therefore, when dropping the end winding portion 1A into the end winding portion storage groove 14, first, the inclination angle is small and it is difficult to get over the hook portion 13.
_The force applied to the end winding portion 1A by first hooking the _b side into the end winding portion accommodating groove 14 and then sliding the end winding portion 1A on the inclined surface and over the hook portion 13 on the θa side having _a large inclination angle. Can be minimized and the end winding portion 1A can be dropped into the end winding portion storage groove 14. FIG. 2 is a sectional view showing a different embodiment of the connecting device of the present invention for connecting a plate-shaped part and a compression coil spring. This embodiment is different from the embodiment shown in FIG. 1 in that the end turn portion 1A of the compression coil spring 1 is constituted by a densely wound portion having a plurality of turns, and the opening height h of the end turn portion storage groove 14 is accordingly increased. Is formed somewhat higher than the height 2d of the end winding portion 1A. Therefore, in this embodiment, similarly to the embodiment shown in FIG. 1, a change in the spring characteristics of the compression coil spring 1 caused by the end winding portion 1A being restrained or fixed to the plate-shaped component 2 is avoided. The advantage that the component 2 can be spring-biased stably is obtained. FIG. 3 is a side view of a main part showing a further embodiment of a connecting device for a plate-shaped component and a compression coil spring according to the present invention.
FIG. 4 is a side view of a main part showing still another embodiment of the connecting device for a plate-shaped component and a compression coil spring according to the present invention. The difference between these embodiments from the embodiment shown in FIG. 1 is that the shape of the inclined portion 15A is an isosceles triangle in the embodiment shown in FIG. 3, and the inclined portion 15B is an arc in the embodiment shown in FIG. On the point. In the case of the embodiment shown in FIG. 3, when the height L of the isosceles triangle is increased, the inclination angle θ is increased, and the vertical pushing load can be changed to a force for expanding the end winding portion 1A outward. Further, the end winding portion 1A can be easily dropped into the end winding portion storage groove 14 with a small pushing load. Further, in the case of the embodiment shown in FIG. 4, since the inclined angle of the arc-shaped inclined portion 15B becomes large near the hook portion which comes into contact with the end turn portion 1A, this is used to reduce the end turn portion 1 with a small pushing load.
A can be easily dropped into the end winding portion storage groove 14. FIGS. 5A and 5B are explanatory views of a method of manufacturing the apparatus for coupling a plate-shaped component and a compression coil spring according to the present invention, wherein FIG. 5A is a plan view showing a state after punching is completed, and FIG. It is a top view which shows the state after completion | finish. In the punching process, as shown in FIG. 3A, the pair of coupling plate portions 22 having the inclined portions 15 and the hook portions 13 and the pair of receiving portions 26 are left on the plate-shaped component 2 side, and the end winding portion storage groove 14 is formed. Notch groove 24
Is formed. In the bending process, as shown in FIG. 2B, a pair of parallel connecting plate portions 12 is formed by bending the connecting plate portion 22 to one surface side of the plate-shaped component 2 at a substantially right angle. Receiving portions 26 and 27 for receiving end winding portion 1A at four locations are formed. According to this method, it is possible to obtain an advantage that the coupling device can be easily formed in two steps of the punching process and the bending and bending process, and the spring characteristics are stably maintained by receiving the end winding portion 1A at the four receiving portions. The possible benefits are obtained. FIGS. 6 to 8 show another embodiment of the connecting device for the plate-shaped component and the compression coil spring according to the present invention. FIG. 6 shows the opening and closing provided with the connecting device for the plate-shaped component and the compression coil spring of the present invention. FIG. 7 is a cross-sectional view of a main part showing the device in a simplified manner, FIG. 7 is a plan view of a plate-like component provided with the coupling device in FIG. 6, and FIG. In the figure, a switchgear 31 has, for example, a pair of fixed contacts 33 supported by an insulating case 35 thereof. A movable contact 36 which is in conductive contact with the pair of fixed contacts 33 is, for example, caulked to both ends of a movable switch plate 34. Is done. The movable switch plate 34 is fixed to one surface of a mover support plate 32 as a plate-like component, and the mover support plate 32 serves as a coupling device protruding from a surface opposite to the movable switch plate 34. A pair of coupling plate portions 12 are provided at two locations opposing the movable contact 36. One end of the pair of compression coil springs 1 is coupled to the mover support plate 32 at two places via the coupling plate portion 12, and the other end is engaged in two recesses 35 </ b> A of the insulating case 35. Accordingly, the movable contact 36 is spring-biased at a constant pressure toward the pair of fixed contacts 33 via the movable member support plate 32 and the movable switch plate 34. In this embodiment, the movable contact 36 is uniformly spring-loaded toward the fixed contact 33 by a pair of compression coil springs 1 in which the end winding portion 1A is loosely supported by the end winding portion accommodating groove 14 from its inner diameter side. As a result, a good conductive contact state is obtained between the movable contact and the fixed contact, and the movable coil support plate 32 is pinched by a tool and the compression coil spring 1 and the movable contact Since the operation of inserting the child 36 between the insulating case 32 and the fixed contact 33 of the switching device 31 can be performed easily and without deforming the compression coil spring, an advantage that the assembly cost of the switching device can be reduced can be obtained. Further, as compared with the conventional cam switch shown in FIG. 10, there is obtained an advantage that the conductive coupling by the swaging of the movable contact 36 and the movable switch plate 34 can be completely performed. By applying the connecting device of the present invention for connecting the plate-shaped component and the compression coil spring to, for example, the connecting portion between the mover support plate of the switching device and the compression coil spring, the spring characteristics are stabilized. Therefore, there is obtained an advantage that the conductive contact state between the fixed contact and the movable contact can be favorably and stably maintained. Further, there is provided a coupling device of a plate-shaped component and a compression coil spring which can stably maintain excellent spring characteristics while avoiding a decrease in spring characteristics conventionally caused by fixing or restraining an end of the compression coil spring. be able to. Furthermore, since the joining device can be manufactured in two steps of punching and bending, no other parts are required, and the joining operation is facilitated by providing the inclined portion at the tip of the joining plate. In addition, it is possible to provide an economically advantageous connecting device between a plate-shaped component and a compression coil spring, which has a low manufacturing cost. [0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a connecting device for a plate-shaped component and a compression coil spring according to the present invention, wherein (a) is a plan view and (b) is (a).
FIG. 2 is a cross-sectional view taken along the line XX of FIG. 2. FIG. 2 is a cross-sectional view showing a different embodiment of the coupling device between the plate-shaped component and the compression coil spring according to the present invention. FIG. 4 is a side view of an essential part showing still another embodiment of the present invention. FIG. 4 is a side view of an essential part showing still another embodiment of a coupling device for a plate-shaped part and a compression coil spring according to the present invention. It is explanatory drawing of the manufacturing method of the coupling device of a component and a compression coil spring, (a) is a top view which shows the state after punching completion | finish, (b) is a top view which shows the state after completion | finish of bending and bending processing [FIG. FIG. 7 is a simplified cross-sectional view of a main part of a switchgear provided with a connecting device for a plate-shaped component and a compression coil spring according to the present invention. FIG. 7 is a plan view of the plate-shaped component provided with a connecting device in FIG. FIG. 9 is a sectional view taken along the line YY in FIG. 7; FIG. 10 is a cross-sectional view schematically showing the conventional assembly structure of FIG. 10. FIG. 10 shows a conventional coupling device of a plate-shaped component and a compression coil spring, (a) is a plan view, (b) is a side cross-sectional view (FIG. 11) FIG. 12 is a cross-sectional view showing a conventional plate-shaped component and a compression coil spring coupling device. FIG. 12 shows another conventional plate-shaped component and a compression coil spring coupling device, where (a) is a plan view and (b) is a side cross-section. FIG. 13 is a cross-sectional view showing another conventional coupling device for a plate-shaped component and a compression coil spring. [Description of References] 1 Compression coil spring 1A End winding portion 2 Plate-shaped component 12 Coupling plate portion 13 Hook portion 13A Hook portion The end 14 of the end winding portion storage groove 14A The bottom of the end winding portion storage groove 15 Inclined portion (refraction surface) 15A Inclined portion (reflection surface) 15B Inclined portion (arc shape) 26 Receiving seat portion 27 Receiving seat portion 31 Opening / closing device 32 Movable Child support plate (plate-like part) 33 Fixed contact 34 Movable switch 35 insulating case 36 movable contact

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-7-296680 (JP, A) JP-A 1-1131039 (JP, U) JP-A 57-59229 (JP, U) JP-A 62- 28605 (JP, U) JP-A-6-87343 (JP, U) JP-A 6-71928 (JP, U) JP-A 3-32331 (JP, U) Jiko 41-5990 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 1/12

Claims (1)

(57) [Claims 1] A plate-like component is provided in a case of an opening / closing device that supports a fixed contact, supports a movable contact on one surface side, and has an end winding at an end. A movable plate supporting plate that is spring-biased toward a fixed contact by a compression coil spring having a portion; a coupling plate portion formed by bending a portion of the movable member support plate substantially perpendicularly to the other surface side; An inclined portion formed at the end of the coupling plate portion so as to be convex at the center thereof; and a hook portion formed at both ends of the inclined portion as an extension thereof toward the compression coil spring side, A plate-shaped component and a compression coil spring, comprising: a U-shaped portion formed between the movable member support plate and a surface of the U-shaped portion; Binding device.