JPH04101331U - Self-returning pull switch - Google Patents

Abstract

(57) [Summary] [Purpose] Hook-shaped pieces are formed on both sides of a through hole placed horizontally at a predetermined location of an insulating movable contact rod made of resin having rigidity and some elasticity and molded into a rod shape. To obtain a pull switch in which a movable contact tube is fitted onto a movable contact rod without heat curling processing against the elasticity of these bullets. [Structure] The insulating switch cylinder 1 has a through hole 13 in the bottom part 12 and an upper opening part 14, and has a flange 27 approximately in the center and a tapered part.
An insulating movable armature rod 2 is provided with a movable armature tube 26 that is fitted into a reduced diameter portion 29 adjacent to the through hole 20 against the elasticity of the hook-shaped bullet 21, and the insulating movable armature in the center. An insulating lid body 4A having a recess 42 through which the tapered part 28 of the contact rod 2 is inserted, and a pair of fixed contact pieces 5a and 5b embedded and fixed in parallel at positions equidistant from the center; A coil spring 3 interposed between the lower surface of the collar 27 of the movable contact rod 2 and the upper surface of the bottom 12 of the insulating switch cylinder 1 was provided and assembled in sequence.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea was developed to improve the mounting structure of the movable contact piece in a non-locking type pull switch. Concerning a self-returning pull switch with excellent features.

0002

[Conventional technology]

For example, a non-lock that connects and disconnects with the above operation to confirm the vehicle driving operation. A type of pull switch is installed on the vehicle.

0003 This type of pull switch has been known in the past, for example, as described in Japanese Utility Model Application Publication No. 59-173951. There was something listed. This conventional technology consists of a bottomed casing with mounting screws formed on the outer periphery and a bottom of the casing. It is installed in such a way that it penetrates through the shell and is always fired toward the opening of the housing, and is made of insulating material. a movable armature rod attached to the opening of the casing, and an upper limit of movement of the movable armature arm within the casing; A lid body with a fixed contact piece mounting hole and a locking part cut and raised toward the center. A curved portion is formed on the inside so that the claw and one end come into elastic contact with the contact piece of the movable contact piece rod, and the lid body a fixed contact piece that can be inserted into the fixed contact piece mounting hole of This is a pull switch characterized by a movable contact tube fixed by heat curling. be.

0004

[Problem that the idea aims to solve]

In the conventional technology described above, a cylindrical movable arm is attached to the reduced diameter part connected to the tapered part of the movable arm. After fitting, the end of the reduced diameter part is heated and softened, crushed and curled. Accordingly, a cylindrical movable contact piece is fitted into the reduced diameter portion of the movable contact rod. Therefore, the above-mentioned heating curling process itself is extremely troublesome, and moreover, the curling accuracy is There are many variations, making it difficult to obtain high-quality and uniform products, and the assembly process cannot be automated. There was a point.

[0005] In order to eliminate each of the above-mentioned problems, this idea was developed to improve the rigidity and youthfulness of acetal resin, etc. An insulating movable contact rod made of resin with extremely elastic properties is installed horizontally at a designated location. Hook-shaped bullet pieces are formed on both sides of the through hole, and the movable contact piece cylinder is made to resist the elasticity of these bullet pieces. The purpose is to fit into a movable contact rod without heating and curling.

[0006]

[Means to solve the problem]

The purpose of this invention described above is that when configuring a pull switch, the through hole at the bottom The insulating switch cylinder has an opening at the top and an opening at the top, a flange at approximately the center, and a cylindrical body with a flange adjacent to the tapered part. Equipped with a movable contact piece tube that is fitted into the contact reduced diameter part to resist the elasticity of the hook-shaped bullet due to the through hole. It has an insulating movable arm and a recess in the center through which the tapered part of the insulating movable arm is inserted. and an insulating lid that has a pair of fixed contact pieces protruding in parallel at positions equidistant from the center. the lower surface of the collar of the insulating movable contact rod, and the upper surface of the bottom of the insulating switch barrel. This can be achieved by sequentially assembling the coil springs interposed between the Ru.

[0007]

[Effect]

An insulating movable contact rod made by molding plastic with rigidity and some elasticity. The movable contact piece resists the elasticity of the hook-shaped piece due to the through hole in the reduced diameter part that is connected to the tapered part. When the cylinder is pushed in, the hook-shaped bullet bends in the direction of narrowing the width of the through hole, and then the movable contact piece When the cylinder meets the reduced diameter part, the above-described bent hook-shaped bullet snaps due to its own elasticity. It returns to its original state and expands, and the movable contact tube can be fitted into the reduced diameter part, and this fitting position is as shown above. It can be restrained with a restored hook-shaped bullet.

[0008] For operation, the insulating switch cylinder is fixed and the insulating movable contact rod is coiled. When pulled against the elasticity of the spring, a movable contact tube is inserted between a pair of fixed contact pieces. Then, the movable contact piece can short-circuit the fixed contact pieces to make them conductive.

[0009] Also, if the tensile force applied to the movable arm is released, the movable arm will be coiled. The tip of the tapered part of the rod comes into elastic contact with the original position, that is, the bottom of the concave part of the lid body, due to the elastic force of the pulling. When the movable contact piece separates from the pair of fixed contact pieces, the conduction between each fixed contact piece is interrupted. It acts as a self-resetting pull switch.

0010

【Example】

Examples will be described with reference to the drawings. As shown in Figure 1, the configuration of this device is as follows: A screw 11 is formed on most of it so that a mounting nut 6 (described later) can be screwed into it, and the bottom A through hole 13 through which the insulating movable contact rod 2 is inserted is provided in the center of the portion 12, and an upper opening 14 is provided. The diameter of the side is slightly enlarged, and the opening and the inner circumferential surface near the opening have through holes 15 for attaching the lid 4A. A stepped portion 16 is provided.

[0011] 2 is a rod-shaped insulating movable contact rod as shown in Figures 2 and 3, and is made of acetal resin or 6 6 - Made by molding a resin such as nylon that has rigidity and some elasticity, and approximately in the center. It has a collar 27 at one end, a drawstring attachment part 22 at one end, and a tapered part 28 at the other end, and the tapered part 28 As shown in FIG. 4, the diameter-reduced portion 29 adjacent to As shown in FIG. 5, it is equipped with a movable contact tube 26 that is fitted.

0012 In other words, it is connected to the tapered part 28 of the insulating movable contact rod 2 formed by molding as described above. to form a reduced diameter portion 29, and the movable contact piece cylinder 26 resists the elasticity of the hook-shaped bullet 2 due to the through hole 20. When pushed into the reduced diameter portion 29 as shown in FIG. After bending in the narrowing direction as shown in Fig. 4, the point at which the movable armature tube 26 matches the reduced diameter part 29 The above bent hook-shaped bullet 21 snaps back to its original state due to its own elasticity, as shown in Figure 5. The movable contact tube 26 can be fitted into the reduced diameter part 29, and this fitting position can be adjusted as described above. It can be restrained with 21 hook-shaped bullets.

[0013] 3 is a coil spring, 4A is a lid body, and this lid body is attached to an insulating member as shown in Figure 6. One side has a convex portion 41 whose outer peripheral surface touches the inner surface of the inner cavity 17, and a convex portion 41 at the center thereof. A recess 42 through which the detail 28 is inserted is provided, and the other side is provided at equal intervals from the center (from the inner diameter of the recess 42). The inner edge and outer edge of the pair of rectangular fixed contact piece insertion holes 43a and 43b are located at A pair of protruding support protrusions 44a and 44b are provided so that their side surfaces coincide with each other, and the insertion Expanded portions 45a and 45b are formed at the openings on one side of the holes 43a and 43b.

[0014] 5a and 5b are fixed contact pieces made of elastic conductive metal such as phosphor bronze as shown in Fig. 6, and are strip-shaped. The conductive member is bent into a U-shape to form a locking part 56, and the tip is curved inward to form a movable contact. A contact portion 53 is formed for contacting the single cylinder 26, and a U-shaped cut is made toward the side. The extension lines of their tips intersect with each other, and the distance between the tips is made slightly narrower than the thickness of the lid body 4A. The locking claws 55a and 55b are respectively formed in such a manner that they are cut and raised.

[0015] 6 is a mounting nut made of synthetic resin etc. that is screwed onto the screw 11, and the main body of the nut is 61, and an annular groove 62 on the main body side of the nut into which a mounting member (not shown) fits. Although not shown, a mounting body 63 having a plurality of vertical grooves is integrally provided.

[0016] The configuration of each part of this switch is as described above, and the assembly is shown in Figure 6. As shown, the terminals of the fixed contact pieces 5a and 5b are inserted into the pair of fixed contact insertion holes 43a and 43b of the lid body 4A. By inserting the portion 57 side of the hole from the side where the enlarged portions 45a, 45b are formed, the locking claws 55a, 55b is engaged with the top surface of the lid body 4A and installed so as to be supported by the support protrusions 44a and 44b. In this state, a gap is formed between the contact portions 53 that is slightly narrower than the diameter of the movable contact tube 26. .

[0017] Next, enter the inner cavity 17 from the upper opening 14 side of the insulating switch cylinder 1 as shown in Figure 1. The movable contact piece rod 2 protrudes outward from the through hole 13, and the fixed contact pieces 5a, 5b are connected to each other. Push the attached lid 4A from the opening 14 side of the switch cylinder 1 as shown in Figure 1. As a result, the inclined protrusions 46, 46 of the lid fit into the through holes 15, 15, and the switch cylinder Assembly is completed by screwing the mounting nut 6 onto the screw 11 of the body 1.

[0018] Note that the pair of fixed contact pieces 5a and 5b do not have the above-mentioned bent structure, but are straight. Embed fixed contact pieces 5a and 5b made of band-shaped phosphor bronze plates etc. into the lid body 4A by insert molding. It is also possible to adopt one with a protrusion.

[0019] The pull switch based on this invention has the above structure, so this switch As shown in Fig. 1, when not in operation, the movable contact rod 2 is moved by the elasticity of the coil spring 3. The tip of the tapered part 28 has risen to the position where it touches the inside of the recess 42 of the lid body 4A, and this In this state, the insulating part 2a of the movable contact rod 2 is interposed between the contact parts 53, 53 of the fixed contact pieces 5a, 5b. It is currently in a break state.

[0020] Next, pull the drawstring a attached to the drawstring attachment part 22 of the movable arm 2, as shown in Figure 7. In this way, the movable contact rod 2 descends against the elasticity of the coil spring 3, and the spring The movable contact piece is attached to the contact portion 53 of the fixed contact piece 5a, 5b at the position just before the bending allowance of the ring is exhausted. The tubes 26 come into contact, and conduction occurs between the two fixed contact pieces, resulting in a make-up state, which is applied to the drawstring a, etc. When the indexing force is cut off, the movable contact rod 2 returns to its original position due to the elasticity of the coil spring 3. The break state is again shown in Figure 1, and the make state is not locked. stomach.

[0021]

[Effect of the idea]

Since this invention is configured as explained above, it produces the effects described below. Connected to the tapered part 28 of the insulating movable contact rod 2 made of resin with rigidity and some elasticity. to form a reduced diameter part 29, and the movable contact piece cylinder resists the elasticity of the hook-shaped bullet piece 21 due to the through hole 20. 26 into the reduced diameter portion 29, the hook-shaped bullet 21 moves in the direction where the width of the through hole 20 becomes narrower. After being bent, when the movable contact piece tube 26 matches the reduced diameter part 29, the bent hook-shaped piece 21 is Due to its self-resilience, it snaps back to its original state and expands, placing the movable contact tube 26 inside the reduced diameter portion 29. It can be fitted, and this fitting position can be restrained by the above-mentioned restored hook-shaped bullet 21, causing the position to shift accidentally. There's nothing to do.

[0022] Therefore, the movable armature tube 26 is heated and curled on the reduced diameter portion 29 of the insulating movable armature rod 2. Since it can be fitted with one touch without any trouble, the number of parts is small and assembly is easy. In addition, the insulating movable contact rod 2 is mounted on the insulating switch body 1, and then the fixed contact is mounted. All you have to do is put the included lid 4A over the opening of cylinder 1, so it is extremely easy to assemble the whole thing. It is easy to install, and it is also easy to attach the pair of fixed contact pieces to the lid, ensuring quality. It has the advantage that uniform products can be mass-produced through automation.

[Brief explanation of drawings]

[Figure 1] Longitudinal cross-sectional view of the pull switch of the present invention

[Figure 2] Elevation view of movable armrest

[Figure 3] Perspective view of the main parts of the same as above

[Fig. 4] Cross-sectional view of main parts during fitting of the movable armature tube to the movable armature lever

[Figure 5] Cross-sectional view of the main parts of the above after fitting

[Fig. 6] Cross-sectional view of a lid body with a fixed contact piece

[Figure 7] Longitudinal cross-sectional view in a different state from Figure 1

[Explanation of symbols]

1 Insulating switch cylinder 2 Insulating movable contact rod 3 coil spring 4A insulating lid 5a,5b Fixed contact piece 12 Bottom 13 Through hole 14 Top opening 20 Through hole 21 hooked bullet fragment 26 Movable contact tube 27 Tsuba 28 Tapered part 29 Reduced diameter part 42 Recess

Claims (1)

[Scope of utility model registration request] [Claim 1] The pull switch includes the following components:
Self-returning pull switch consisting of (a) to (d). (a) An insulating switch cylinder 1 having a through hole 13 in a bottom part 12 and an upper opening 14. (b) A reduced diameter portion 29 having a flange 27 approximately in the center and adjacent to the tapered portion 28
An insulating movable armature rod 2 is provided with a movable armature tube 26 that is fitted against the elasticity of a hook-shaped bullet 21 through a through hole 20. (c) It has a recess 42 in the center into which the tapered part 28 of the insulating movable contact rod 2 is inserted, and has a pair of fixed contact pieces 5a, 5b protruding in parallel at positions equidistant from the center. Insulating lid 4A. (d) A coil spring 3 interposed between the lower surface of the collar 27 of the insulative movable contact rod 2 and the upper surface of the bottom portion 12 of the insulative switch cylinder 1.