JPH0334024Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push-button switch that locks when pressed once and releases the lock and returns when pressed again. This invention relates to an improved push-button switch.

Push-button switches, which repeatedly lock and unlock each time they are pressed, have various structures that have been put to practical use, each with its own merits and demerits. Among these, there is a push-button switch having a cam plate 3 provided with a heart-shaped locking groove 17, as shown in FIG. 1, which requires less space for installation and produces less noise during operation. In this type of push button switch, a movable contact 6 is fixed to a sliding rod 4 which is directly manually operated via a button 9, and this sliding rod 4 is housed in a housing 1 and is raised upwardly by a coil spring 5. is being energized.

A cam plate 3 having a heart-shaped locking groove 17 is rotatably supported by a pillar-shaped pivot shaft 11 installed in the housing 1, and is fixed to the sliding rod 4. A locking projection 10 is engaged with the heart-shaped locking groove 11 mentioned above. 13 is a shaft hole for supporting the cam plate 3, and 2 is a coil torsion spring that biases the cam plate 3 with rotational force in the direction of arrow 14. 8 is a lid of the housing 1, and a fixed contact 7 is fixed to this lid. Both ends of the coiled torsion spring 2 engage with a hook 15 fixed to the housing 1 and a hook (not shown) fixed to the cam plate 3, respectively, to apply rotational force to the cam plate 3. ing.

In the push-button switch configured as described above, each time the button 9 is pressed down repeatedly, the locking protrusion 10 is alternately attached to the upper locking portion A and the lower locking portion B of the heart-shaped locking groove 17. When engaged, the upward stroke by the coil spring 5 is locked, and the unlocked state and locked state are repeated. Along with this,
A movable contact 6 fixed to the sliding rod 4 and a fixed contact 7 fixed to the lid 8 repeatedly turn ON and OFF.

As explained above, the sliding rod 4 having the movable contact 6 that engages with the fixed contact 7, the locking projection 10 provided on the sliding rod, and the locking groove 17 that engages with the projection 10 are provided. A push-button switch is made up of a cam plate 3, a pivot shaft 11 that rotatably supports the cam plate 3, and a spring 2 that biases the cam plate to rotate in a certain direction. Although it has many advantages such as requiring a small installation space and making very little noise during operation, it has a technical problem in that it is difficult to reduce the stroke of the push button 9. . The reason for this is that the total height H in the vertical direction of the heart-shaped locking groove 17 must be larger than the distance L between the upper and lower locking positions A and B, and the sliding rod 4 is attached to this locking groove 17. Guided by distance H
This is because it is actually not easy to make this heart-shaped locking groove 17 very small due to the structural characteristic that it must move up and down. Conventionally, the minimum push stroke in this type of practical instrument was approximately 3.5 mm.

The present invention was devised in view of the above circumstances, and takes full advantage of the advantages of the push-button switch equipped with the cam plate with the heart-shaped locking groove 17 described above, while significantly improving the push stroke of the button. The purpose of the present invention is to provide a push-button switch that can be made smaller.

In order to achieve the above object, the push-button switch of the present invention includes a sliding member having a fixed movable contact that engages with a fixed contact, a protrusion provided on the sliding member, and a protrusion that engages with the protrusion. A push-button switch comprising a cam plate having a heart-shaped locking groove, means for rotatably supporting the cam plate, and means for biasing the cam plate to rotate in a certain direction. comprises an operating member to which a push button is fixed, and an L-shaped lever rotatably supported near a bent portion and having a long arm and a short arm, and the sliding member is connected to the L-shaped lever. It is characterized in that the operating member is attached to a short arm of the L-shaped lever near the free end of the long arm of the L-shaped lever.

Next, an embodiment of the present invention will be described with reference to FIGS. 2 to 7. FIG. 2 is an exploded perspective view of one embodiment of the push-button switch of the present invention, and corresponds to FIG. 1 of the conventional push-button switch having a cam plate with a heart-shaped locking groove.
FIG. 3 is a partially cutaway perspective view.

A housing 1 with the same drawing reference numbers as in FIG. 1 (conventional example), a torsion coil spring 2, a cam plate 3 with a heart-shaped locking groove 17, a movable contact 6, a fixed contact 7, a housing lid 8, The pivot shaft 11 of the cam plate is the same or similar component as in FIG. 1 (prior art).

The button 9' and the coil spring 5' are the first
The coil spring 5' is a member corresponding to the button 9 and the coil spring 5 in the switch shown in the figure, but the coil spring 5' in this embodiment is compressed and interposed between the housing 1 and the button 9' to bias the button 9' upward. Configure.

An operating member 2 that is slidably fitted into the housing 1
4 and is attached to the button 9' with the attachment screw 25.

On the other hand, it constitutes a lever 20 for transmission. A plan view of the lever 20 described above is shown in FIG. The lever 20 in this embodiment is formed into an L-shape, with a shaft hole 20c for pivot support provided near the bent portion, cutouts 20a and 20b for transmission at both ends, and a length a of the horizontal arm portion. The length of the vertical arm part b is formed to be larger than that of the vertical arm part b.

FIG. 5 shows the housing lid 8 viewed in the direction of arrow C. In this embodiment, a pivot shaft 8a is fixed to the lid 8, and is fitted into the shaft hole 20c of the lever 20 to rotatably support the lever 20.

A protrusion 24a is integrally connected to the operating member 24, and this is connected to the transmission notch 2 of the lever 20.
Engages with 0a. As a result, when the button 9' is pressed down, the operating member 24 is lowered, and the lever 20 is accordingly rotated around the pivot shaft 8a.

A sliding member 21 is formed separately from the above. FIG. 6 is a perspective view of this sliding member 21 viewed in the direction of arrow D. The above-mentioned sliding member 21 is fitted into the housing 1 so as to be slidable in the direction of the arrow E-E'. A protrusion 21b that engages with the transmission notch 20b of the lever 20 and a locking protrusion 21c that engages with the heart-shaped locking groove 17 of the cam plate 3 are integrally connected to this sliding member 21, and A recess 21a is formed into which the movable contact 6 is fitted and supported.

As described above, this embodiment includes a sliding member 21 to which the movable contact 6 that engages with the fixed contact 7 is fixed, and a locking protrusion 21c provided on the sliding member 21.
and a locking groove 17 that engages with the projection 21c.
, a pivot shaft 11 rotatably supporting the cam plate 3, and a torsion coil spring 2 biasing the cam plate 3 to rotate in a certain direction. There is an operating member 24 configured to be directly pushed by a button 9'.
and a sliding member 21 to which the movable contact 6 is fixed are connected via a lever 20. And lever 2
Since the length b of the vertical portion of the arm is greater than the length a of the horizontal portion of the arm, the vertical movement of the button 9' is magnified and transmitted to the sliding member 21. FIG. 7 is a partial sectional view taken in the direction of arrow X shown in FIG.

Since the present embodiment is constructed as described above, the vertical stroke of the button 9' is transmitted to the sliding member 21 while being magnified by a factor of b/a. That is, by pressing the button 9' by the stroke a/b necessary to move the sliding member 21, the switch is locked and unlocked, and the switch is turned on and off accordingly. . In this example, the push stroke was able to be shortened to 2/3. Moreover, in order to easily understand by comparing FIG. 1 (conventional example) and FIG. 2 (this example),
The push button type switch of this embodiment has a housing 1.
Since the main operating members are housed in the switch, the advantages of small size and low noise of the conventional push-button switch equipped with a cam plate 3 with a heart-shaped locking groove are maintained.

In the above embodiment, the procedure for assembling from the disassembled state shown in FIG. 2 to the state shown in FIG. Shaft hole 1 of plate 3
3 to rotatably support the cam plate 13 and urge it in the direction of arrow 14.

(b) The button 9' and the operating member 24 are connected with the mounting screw 25 so that the coil spring 5' is sandwiched between them, so that the button 9' and the coil spring 5' are located above the housing 1, and the operating member 24 is housed in the housing 1. Assemble it as shown.

(c) The movable contact 6 is fitted into the recess 21a of the sliding member 21 and fixed, and the locking protrusion 21c is fitted into the heart-shaped locking groove of the cam plate 3 and housed in the housing 1.

(d) Connect the transmission notch 20a of the lever 20 to the operating member 2.
There is also a transmission notch 2 in the transmission protrusion 24a of No. 4.
0b respectively to the transmission protrusions 21b of the sliding member 21, and the lever 20 is moved into the housing 1.
Store inside.

(e) Fit the pivot shaft 8a of the housing lid 8 into the shaft hole 20c of the lever 20, and attach the housing lid 8 to the housing 1. As described above, the push button switch of this embodiment can be easily assembled.

As explained above, the present invention includes a sliding member to which a movable contact is fixed, a protrusion provided on the sliding member, a cam plate having a heart-shaped locking groove that engages with the protrusion, and It consists of means for rotatably supporting the cam plate, and means for urging the cam plate to rotate in a fixed direction.

An operating member to which a push button is fixed, and an L-shaped lever rotatably supported near a bent portion and having a long arm and a short arm are provided, and the sliding member is connected to the long arm of the L-shaped lever. Since the operating member is engaged near the free end of the arm and the short arm of the L-shaped lever, the advantage of a push-button switch equipped with a cam plate having a heart-shaped locking groove (the space required for installation is small) is achieved. It is possible to expand the operating stroke of the push button and transmit it to the contact mechanism part (sliding member 21 to which the movable contact 6 is attached) without impairing the operating stroke of the push button. It can be configured much smaller.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a conventional push button switch having a cam plate with a heart-shaped locking groove. Figures 2 to 7 show an embodiment of the push button switch of the present invention, with Figure 2 being an exploded perspective view, Figure 3 being a partially cutaway perspective view, and Figure 4 being a plan view of the lever. , FIG. 5 is a perspective view of the housing lid seen in the direction of arrow C in FIG. 2, FIG. 6 is a perspective view of the sliding member seen in the direction of arrow D in FIG. FIG. 3 is a partial cross-sectional view seen in the direction of arrow X. 1...Housing, 2...Screw coil spring, 3
...Cam plate, 4...Sliding rod, 5, 5'...Coil spring, 6...Movable contact, 7...Fixed contact, 8...
Housing lid, 8a... Pivot shaft, 9, 9'...
Button, 10...Lock protrusion, 11...Pivot shaft, 13...Shaft hole, 17...Lock groove, 20
...Lever used as a transmission member, 20a, 2
0b...Notch for transmission, 20c...Shaft hole, 21...
...Sliding member, 21a...Recess, 21b...Protrusion for transmission, 21c...Protrusion for locking, 24...Operation member, 24a...Protrusion for transmission, 25...Mounting screw.

Claims (1)

[Claims for Utility Model Registration] A sliding member having a movable contact that engages with a fixed contact, a projection provided on the sliding member, and a cam having a heart-shaped locking groove that engages with the projection. a plate, and means for rotatably supporting the cam plate;
The push-button switch consists of a means for biasing the cam plate to rotate in a certain direction, and includes an operating member to which a push button is fixed, a long arm and a short arm that are rotatably supported near the bend. an L-shaped lever having an arm, the sliding member being engaged near the free end of the long arm of the L-shaped lever, and the operating member being engaged with the short arm of the L-shaped lever. A push-button switch characterized by the fact that it is worn.