JPH059787Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a pushbutton switch, and more particularly to a pushbutton switch equipped with a heart-shaped cam structured to lock the operating shaft in response to the pressing motion of the operating shaft. Regarding.

[Conventional technology]

In general, a pushbutton switch has an operating shaft, a movable contact that is linked to the operation of the operating shaft, and a heart-shaped cam that locks the operating shaft at a predetermined position as necessary when the operating shaft is pressed. , the first pressing operation on the operating shaft causes the operating shaft to be locked to the heart-shaped cam, one circuit contact is turned ON, and the next pressing operation releases the operating shaft from the locked state. In this open position, one of the circuit contacts is turned off and the other circuit contact is turned on. In this case, the heart-shaped cam is configured to reciprocate by the pressing action of the return spring and the pressing action of the operating shaft, thereby achieving the locking function described above.

[Problem that the invention attempts to solve]

In the conventional example described above, when the operating shaft is pushed, the internal tip of the shaft shakes, which tends to cause malfunction and damage the surrounding members.
There was a problem with durability. For this reason, in this invention,
It is an object of the present invention to provide a durable pushbutton switch with less vibration of the operating shaft by resolving such inconveniences.

[Means for solving the problem]

Therefore, in the present invention, an operating shaft installed inside the frame, a movable contact that is linked to the operation of this operating shaft,
A pushbutton switch having a heart-shaped cam that locks the operating shaft at a predetermined position as necessary when the operating shaft is pressed against a return spring, wherein the movable contact is operated via a contact drive member. The contact drive member is engaged with the shaft, and is connected to an annular member that supports the end of the operating shaft, a guide arm provided on both sides of the annular member, and an engaging member provided at one end of the annular member. The end of the operating shaft is supported by the annular member, so that vibration can be suppressed;
Further, the guide arm allows smooth push-push movements of the operating shaft.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

In FIGS. 1 and 2, 10 indicates a frame body, 11 indicates a variable resistance section, and 30 indicates a mounting bracket section. An operating shaft 12 is disposed in the center of the frame 10, and is inserted through the variable resistance section 11 and the mounting fitting section 30. A first drive member 14 for the lock mechanism 13 and a second drive member 16 for the movable contact means 15 are rotatably mounted on the left end of the operating shaft 12 in FIG. Reference numeral 17 indicates a slip-off prevention ring (E-ring), and reference numeral 18 indicates a return spring for the operating shaft 12 to its original position.

In this embodiment, the lock mechanism 13 is
The heart-shaped cam 20 is configured to be rotatable in the directions of arrows A and B with a point as a fulcrum of rotation, and a leaf spring means 21 that constantly presses the rotating end of the heart-shaped cam 20 toward the operating shaft 12. Of these, the heart-shaped cam 20 has a heart-shaped guide/engagement projection 20 in the center as shown in FIG.
A, and on both sides of the main guide groove 20B, there is a forward guide groove 20C and a forward guide groove 20A.
and each of the guide grooves 20B, 20C, 2
At the junction of OD, steps _S1 , _S2 ,
_S3 , _S4 are formed as necessary. 20E denotes a pivot shaft, and 20F denotes a separation prevention groove. The grooves 20B to 20F of the heart-shaped cam 20 thus formed are engaged with the driving projections 14A formed outwardly at one end of the first driving member 14 as shown in FIG.

Further, as shown in FIG. 5, the leaf spring means 21 includes a frame plate part 21B having a band-shaped pressing spring part 21A in the center thereof, and a frame plate part 21B bent in opposite directions at both ends of the frame plate part 21B. It has locking pieces 21C and 21D. One of these locking pieces 21C engages with the locking groove 10A of the frame body 10, and the other locking groove 21D engages with the spring locking protrusion 20H of the heart-shaped cam 20. As a result, the leaf spring means 21 and the heart-shaped cam 20 can be attached to the frame 10 very easily, quickly and reliably as shown in FIG.

The movable contact means 15 is connected to a movable member 1 disposed at a lower portion of the operating shaft 12 in FIG.
5A, and spring contacts 15B and 15C mounted on both sides of the movable member 15A as shown in FIG. Among these, the movable member 15A
The movable member 15A is located at the upper end in FIG.
A recessed groove 15D is formed for engaging and moving the recessed groove 15D, and an engaging protrusion 16B of a second drive member 16, which will be described later, can be engaged with this recessed groove 15D. Also, fixed contacts 10B, 1 are provided on the frame 10 described above corresponding to the spring contacts 15B, 15C.
0C and 10D, respectively, and the spring contact 15
As B and 15C move, predetermined circuit contacts are switched.

a second drive member 16 for the movable contact means 15;
As shown in FIG. 4, the ring body 16A includes a ring body 16A, an engaging protrusion 16B projecting downward from the lower end of the ring body 16A, and the ring body 16A.
It is formed by guide arm portions 16C and 16D projecting from both ends of A as shown in FIG. Then, the guide arm portions 16C and 16D are slidably engaged with guide grooves formed in the side wall of the frame 10, and thereby the arrows E and E of the operating shaft 10
The reciprocating motion in the F direction is performed smoothly, and therefore the movable contact means 15 also reciprocates smoothly, and the circuit contacts are smoothly switched.

Next, the overall operation of the above embodiment will be explained.

First, when the operating shaft 12 is pressed in the E direction against the return spring 18 from the state shown in FIG.
2 is pushed together with the first and second drive members 14, 16 to the position shown in FIGS. 6-7. In this case, the driving protrusion 14A of the first driving member 14 is guided to the detachment prevention groove 20F through the forward guide groove 20C of the heart-shaped cam 20,
On the other hand, the second driving member 16 has its engagement protrusion 1
The movable contact means 15 is engaged with the movable contact means 15 at the 6B portion, and the circuit contacts are connected to 10C-10D as shown in the figure.
I am switching from 10B-10C to 10B-10C. Then, when the external force is gradually released from the operating shaft 12, the operating shaft 12 moves in the direction of arrow F together with the first and second driving members 14, 16, but at the next moment, the first driving member The 14 driving protrusions 14A are engaged with the guide/locking protrusions 20A of the heart-shaped cam 20 and held in the positions shown in FIGS. 8 and 9, thereby locking the push switch. The state is obtained. Next, when the operating shaft 12 is pressed again in the direction of arrow E, the driving protrusion 14A of the first driving member 14 is released from the locked state of the guide/locking protrusion 20A, and then the operating shaft 12 When the external force is gradually released, the driving protrusion 14A is guided to the return guide groove 20C of the heart-shaped cam 20, returning to the state shown in FIGS. 1 and 2. During this time, due to the action of the second drive member 16, the operating shaft 12 is smoothly reciprocated in the E or F directions without any horizontal wobbling, thereby significantly improving the durability of the push switch as a whole. It has the advantage of being increased.

[Effect of idea]

As described above, according to the present invention, there is an operating shaft installed in the frame, a movable contact that is linked to the operation of the operating shaft, and when the operating shaft is pressed against the return spring, the In a push switch having a heart-shaped cam that locks the operating shaft at a predetermined position, the movable contact is engaged with the operating shaft via a contact drive member, and the contact drive member is connected to the end of the operating shaft. The present invention is composed of an annular member that supports the annular member, guide arms provided on both sides of the annular member, and an engaging protrusion provided at one end of the annular member, so that the disadvantages of the conventional example described above are improved. Accordingly, it is possible to provide a push switch that has increased durability and can smoothly push and push the operation shaft.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted sectional view showing an embodiment of the present invention, Fig. 2 is an explanatory view showing the movable contact portion seen from above in Fig. 1, and Fig. 3 is an inverted view showing an example of a heart-shaped cam. FIG. 4 is a perspective view showing the second driving member, FIG. 5 is a perspective view showing the leaf spring means, and FIGS. 6 to 9 are explanatory views showing the operating state. DESCRIPTION OF SYMBOLS 10... Frame body, 12... Operating shaft, 15... Movable contact means, 16... Second drive member as a contact drive member, 16A... Ring body as an annular member, 16B... Engaging protrusion, 16C , 16D...guide arm, 20...heart-shaped cam.

Claims (1)

[Scope of utility model registration request] An operating shaft installed in a frame, a movable contact linked to the operation of the operating shaft, and when the operating shaft is pressed against a return spring, the operating shaft is locked at a predetermined position as necessary. In a push switch having a heart-shaped cam, the movable contact is engaged with an operating shaft via a contact drive member, and the contact drive member is connected to an annular member that supports an end of the operating shaft, and an annular member that supports an end of the operating shaft. Consisting of guide arms provided on both sides of the member and guided by the frame, and an engaging protrusion provided at one end of the annular member that engages with the movable contact means to move the contact means. Pussyyu Pussyyuswitch characterized by.