JPH0648136U - Push switch - Google Patents

Abstract

(57) [Abstract] [Purpose] The assembly is automated by arranging the pair of fixed contact pieces symmetrically with respect to the insulating cylindrical body and increasing the winding diameter of the return spring. Securing the durable mounting strength of the fixed contact piece for a long time. [Structure] Insulation cylinder 1 with locking step 1a formed on the inner surface
And a pair of fixed contact pieces 3 and 4 which are engaged and fixed in the insertion grooves 2 and 2 of the inner wall of the cylindrical body 1 and the contact protruding surfaces 3a and 4a of the fixed contact pieces 3 and 4 respectively. The locking step portion is provided in the cylindrical body 1 and is provided with a movable contact piece 5 having a substantially inverted U shape and is opposed to the spring 6 having a relatively large winding diameter on the spring receiving projection 1b of the insulating cylindrical body 1. And a self-projecting pressing body 8 having a locking piece 7 to be engaged with 1a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a self-returning push switch which is suitable for use as a door switch of an automobile or a lighting flashing switch of a trunk room and which can be fully automatically assembled.

[0002]

[Prior art]

 As a push switch of this type, there has been a push switch described in, for example, Japanese Utility Model Laid-Open No. 4-55611. In this conventional technique, an insulative bottomed cylindrical body having a locking step portion formed on the inner surface thereof, a pair of fixed contact pieces arranged so as to partially face the inner wall of the bottomed cylindrical body, and each of these fixed A movable contact piece having a substantially inverted U-shape that slidably contacts the contact piece and is inserted into the cylindrical body with a spring interposed between the movable piece and the bottom portion of the bottomed cylindrical body to be engaged with the locking step portion. Self-projecting pressing bodies each having a bullet stop piece, and both ends of the movable contact piece, which are inserted through the center bosses of the pressing bodies, through the contact portions of the movable contact pieces are located inside the window hole of the pressing body. It is a push switch that is assembled by making elastic contact with the edge.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, the pair of fixed contact pieces are asymmetric and difficult to assemble, and in particular, the L-shaped fixed contact piece for body earth cannot be automatically press-fitted into the bottomed cylinder or the coil spring can not be automatically inserted. However, there has been a problem that since the press-fitting strength of the L-shaped fixed contact piece is weakened with the lapse of time, malfunctions often occur due to poor contact.

In order to eliminate the above-mentioned problems, the present invention arranges the pair of fixed contact pieces symmetrically with respect to the insulating cylindrical body, and increases the winding diameter of the return spring. The purpose of this is to automate the assembly by and secure the durable mounting strength of the fixed contact piece for a long time.

[0005]

[Means for Solving the Problems] The object of the present invention described above is to form a pair of fixing members that are fixedly engaged with each other by inserting an insulating cylindrical body having a locking step portion formed on the inner surface thereof into each insertion groove of the inner wall facing the insulating cylindrical body. A contact piece and a movable contact piece having a substantially inverted U-shape slidably contacting the contact protruding surface of each of these fixed contact pieces, and the winding diameter arranged on the spring receiving protrusion or the spring receiving projecting piece of the insulating cylinder is relatively large. This can be achieved by including a self-projecting pressing body that has a locking bullet piece that is inserted into the cylindrical body against the spring and that should be engaged with the locking step portion.

[0006]

[Operation] The pair of fixed contact pieces can be symmetrically formed, and the respective contact pieces can be easily inserted and fixed from the lower portions of the left and right eave insertion grooves of the insulating cylinder. Further, the spring has a large winding diameter to prevent the spring from being deformed or displaced due to the eaves of the inner wall of the cylinder or the insertion groove, and the upper and lower sides of the spring do not have to be supported by bosses or the like. .

Further, the pressing body is prevented from largely protruding from the pressing body by narrowing the contact portion interval of the movable contact piece provided therein, so that the pressing body can be easily inserted into the cylinder body and the assembly is realized automatically. it can.

The pressing body is always in the protruding position where the pressing bullet is elastically contacted with the locking step portion of the tubular body by the elastic force of the spring with respect to the insulating tubular body. A movable contact piece can be used to conduct and short-circuit between the contact protruding surfaces, and for example, the interior lamp can be turned on when the door is open.

If the pressing body is pushed into the cylinder body against the elastic force of the spring by closing the door or the like, the contact portion of the movable contact piece is separated from the contact projection surface of the pair and contacts the inner wall surface of the insulating cylinder body. Therefore, the interior light or the like can be turned off by disconnecting the conduction between the pair of fixed contact pieces.

[0011]

【Example】

 Examples will be described with reference to the drawings. First, as shown in FIGS. 1 and 4, the basic structure of the present invention is formed on the opposing inner wall of an insulating cylindrical body 1 made of plastic or the like having a locking step portion 1a on the upper inner surface and a protruding portion 1b on the lower portion. Insert a pair of fixed contact pieces 3 and 4 having contact protruding surfaces 3a and 4a into the eaves insertion grooves 2 and 2 and lock these locking claws 3b and 4b on the cylindrical step edge 1c as shown in FIG. To do.

Further, as shown in FIG. 2, the contact brace 3a, 4a of each of the fixed contact pieces 3, 4 has a contact portion 5a, 5a for slidingly contacting the contact protruding surface 3a, 4a so as to short-circuit them. The movable contact piece 5 made in 1. is temporarily fixed in the pressing body 8 by the locking pieces 5b as shown in FIGS. 3 and 4, and the pressing body 8 projects from four corners of the inner wall of the cylindrical body 1, for example. As shown in FIGS. 2 and 4, the spring 6 is inserted between the spring receiving protrusion 1b and the spring receiving protrusion 1b, and the spring 6 is inserted into the cylindrical body 1 as shown in FIG. As shown in FIG. 4, the portion 1a is engaged and the insertion force is forcedly inserted from the upper portion of the cylindrical body 1 against the elastic force of the locking bullet piece 7.

If the spring receiving projection 1b is a spring receiving elastic piece 1e having a wedge shape as shown in FIG. 8, the spring 6 can be inserted from either the upper or lower direction of the cylinder.

In this invention, as the pressing body 8, for example, a covered rectangular cylindrical body as shown in FIGS. 1 and 5 is used, and the upper protrusion of the movable contact piece 5 is inserted into the upper center hole 8a of FIG. As shown in FIG. 4, the engaging pieces 5b, 5b are temporarily fixed by engaging the pressing body step edge 8b from the upper part of the insulating cylinder body 1 as described above. It is assembled by press fitting against elasticity.

A reference numeral 9 in each drawing is a waterproof cover made of rubber or the like, and when attached to the hole of the door panel P of the car with the cylindrical piece 1d as shown in FIG. The reference numeral 10 is a lead wire crimp-connected to the lower part of the fixed contact pieces 3 and 4, but the lead wire may be joined by using a well-known tab terminal connector or the like instead of the crimp connection.

Further, reference numeral 7a in FIG. 1 is a cut groove for facilitating the locking bullet piece 7 to swing, and the shape and number of the spring receiving projection 1b and the spring receiving bullet piece 1e of the cylindrical body are springs. The number of protrusions may be any number as long as they are 6-shaped.

Further, the fixed contact pieces 3 and 4 forming a pair are symmetrically formed, and the contact pieces can be easily inserted and fixed from the lower portions into the left and right eaves insertion grooves 2 and 2 of the insulating cylinder 1.

Further, the spring 6 has a large winding diameter near the opposing inner wall of the cylindrical body 1, and the eaves of the inner wall of the cylindrical body or the insertion groove 2 does not cause a short circuit between the contact pieces 3 and 4 and causes the spring 6 to bend. Re-deformation and displacement can be prevented, and the upper and lower sides of the spring 6 do not need to be supported by bosses or the like, and automatic insertion into the tubular body 1 can be easily performed.

When the spring receiving piece 1e is adopted as shown in FIG. 8, the spring 6 can be inserted and mounted from the lower part of the cylindrical body 1 against the elastic force of the piece 1e and through the inclined surface 1f thereof.

By assembling the movable contact piece 5 provided in the pressing body 8 by narrowing both ends of the movable contact piece 5 through the contact portions 5a, 5a, the movable contact piece 5 does not significantly protrude from the pressing body 8 to the outside, so that the cylindrical body 1 It can be easily inserted automatically.

Since the present invention has the above-described structure, the pressing body 8 is always pressed against the insulating cylinder 1 by the spring-back force of the spring 6 and the locking bullet piece 7 is locked by the locking step portion 1a of the cylinder. At the projecting position elastically contacting with, the movable contact piece 5 connects and short-circuits between the contact protruding surfaces 3a, 4a of the pair of fixed contact pieces 3, 4 and, for example, the interior light is turned on when the door is open. You can

If the pressing body 8 is pushed into the cylindrical body 1 against the elastic force of the spring 6 by closing the door, etc., the pair of contact projecting surfaces 3 a, 4 a to the contact portion 5 a of the movable contact piece 5 are pressed. Since they are separated from each other and contact the inner wall surface of the cylindrical body 1, the interior light and the like can be turned off by disconnecting the conduction between the pair of fixed contact pieces 3 and 4.

When the pressing body 8 moves up and down in the insulating cylinder 1 in this manner, the pressing body 8 is guided by the inner wall surface of the insulating cylinder 1 and smoothly moves up and down without tilting. The amount of protrusion of the spring 6 by the spring 6 can be limited by elastically engaging the locking bullet pieces 7, 7 with the cylindrical locking step portion 1a.

[0024]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. The pair of fixed contact pieces 3 and 4 can be easily inserted and fixed symmetrically in the erecting insertion grooves 2 and 2 of the insulating cylinder 1 from the lower part to realize automatic insertion and assembly. Since pieces 3 and 4 can be punched from the same punching die, there is the first effect that the die die cost is halved and parts management is easier than with left and right variants.

Since the spring 6 has a large winding diameter so as to reach the inner wall of the cylinder and the eaves of the insertion groove 2, the above-mentioned inner wall and the eaves do not cause short-circuiting between the fixed contact pieces 3 and 4. The second feature is that the spring 6 can be prevented from being deformed or displaced and the upper and lower sides of the spring 6 do not need to be supported by bosses, etc., and the automatic insertion of the spring 6 itself into the tubular body 1 can be easily performed. There is also the effect of.

Further, the movable contact piece 5 provided in the pressing body 8 has a third effect that it can be easily inserted into the cylinder body 1 by narrowing the interval between the contact portions 5a, 5a and can be automatically inserted and assembled. .

Further, in the push switch of the present invention, the self-projecting pressing body 8 by the spring 6 is engaged and locked by the locking bullet piece 7 with the locking step portion 1a formed on the inner surface of the insulating cylindrical body 1. The amount of protrusion is limited to prevent it from being pulled out, and it has the fourth effect that it can be inserted and mounted in the snap and the cylinder with one touch, and the assembly work can be automated easily.

According to the second aspect, when the spring 6 is inserted and mounted in the cylindrical body, the spring 6 can be inserted and mounted from the lower part of the cylindrical body 1 against the elastic force of the spring receiving elastic piece 1e. The effect that the degree of freedom in setting automatic assembly is improved can be added.

In summary, in the self-returning push switch according to the present invention, the constituent elements such as the pair of left and right fixed contacts 3 and 4, the coil spring 6, the pressing body 8 and the movable contact 5 mounted therein are described above. A self-resetting push switch can be created simply by coaxially and randomly inserting it into the insulating cylinder 1 that is the push switch housing in this order, which has the excellent effect that fully automatic assembly is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a notch of a main part showing an example of a push switch according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the assembly of FIG.

FIG. 3 is an enlarged cross-sectional view showing a coupling example of a pressing body and a movable contact piece.

FIG. 4 is a vertical sectional side view of the central portion of the one shown in FIG.

5 is an enlarged cross-sectional view taken along the broken line in FIG.

FIG. 6 is a sectional view showing a state different from that of FIG.

FIG. 7 is a sectional view showing a state different from that of FIG.

FIG. 8 is a perspective view of a main part showing an example of a spring receiving bullet of an insulating cylindrical body.

[Explanation of symbols]

 1 Insulation cylinder 1a Locking step 1b Spring receiving projection 1e Spring receiving bullet 1f Bullet sloping surface 2 Eave insertion groove 3,4 Fixed contact piece 3a, 4a Contact projection 5 Movable contact piece 5a Contact section 6 Spring 7 Locking piece 8 Pressing body

Claims (2)

[Scope of utility model registration request] 1. An insulating cylindrical body having a locking step portion 1a formed on an inner surface thereof.
1 and the fixed contact pieces 3 and 4 that are engaged and fixed in the insertion grooves 2 and 2 of the inner wall of the cylindrical body 1 and the contact protruding surfaces 3a and 4a of the fixed contact pieces 3 and 4, respectively. Nearly inverted U-shaped movable contact piece 5
And a locking bullet to be inserted into the cylindrical body 1 against the spring 6 having a relatively large winding diameter on the spring receiving projection 1b of the insulating cylindrical body 1 and to be engaged with the locking stepped portion 1a. Push switches each comprising a self-projecting pressing body 8 having a piece 7. 2. The push switch according to claim 1, wherein the spring receiving projection 1b of the insulating cylinder 1 is a spring receiving bullet.