JPH0332020Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention enables a push button to be locked in a predetermined pushed position to form a desired electrical circuit, and then further pushed to form a desired electric circuit. This relates to a push button switch that automatically returns to its original position. More specifically, in order to regulate the push stroke position of the push button, a movable plate supported on the operating rod is rammed by a cam plate inserted into the switch case so that it can be replaced as desired. This invention relates to a push button switch equipped with a cam disk integrally formed with a protrusion that is abutted to form a stopper.

(2) Prior art and its problems Conventionally, this type of technology has been designed to lock the push button in the ON position by pushing the button to a predetermined position, and automatically return to the original OFF position by the next push operation. Generally, the position of the stopper that sets the push stroke of a push button switch is determined by the relationship between the movable plate and the switch case, but the cam plate that locks the push button and the switch case are separated, and the position of the stopper is determined by the size of the cam. In other words, the push stroke of the push button can be changed as desired, and various electric circuits can be freely set, so that it can be used freely for the desired electrical equipment. In this mechanism, it is extremely inconvenient that the stopper position is specified by the case and the movable platen as described above. Therefore, a lock pin is elastically inserted into the movable plate so as to be able to move forward and backward in a direction perpendicular to the direction of movement of the movable plate to be guided and moved within the guide groove of the cam disk and the guide groove of the cam disk. However, in such a mechanism, excessive force is applied to the lock pin, and depending on the thickness of the lock pin, the lock pin may be deformed and the push stroke may fluctuate. Not only does this make the locking easier, but there is also a risk that the original locking function may be impaired, and the locking pin, cam disk, etc. have drawbacks such as being limited in terms of strength.

(3) Purpose of the present invention This invention was devised in view of the above-mentioned drawbacks of the present invention, namely, to prevent impact force from being applied to the lock pin at the stopper position due to pressing the push button when the push button is pressed, and In order to be able to freely adjust the push stroke position of the push button by replacing the cam disk as desired, the cam disk is provided with a protrusion that serves as a stopper, and can be adapted to various electrical devices as desired. To provide a push-button switch with a reliable position and excellent operability.

(4) Structure of the present invention A preferred embodiment of the push button switch according to the present invention will be explained in detail based on FIGS. 1 and 2.

1 is a push button. The push button 1 is inserted into one outer end of the operating rod 2 and serves as a knob for pushing the operating rod 2 to a predetermined position.
2 is an operating lever. The operating rod 2 is, for example, a band-shaped flat plate with a predetermined width, and the push button 1 is inserted into one end as described above, and the push button 1 is constantly pressed in the direction of the arrow A as shown in FIG. For example, a rectangular square hole 2a is formed so that the spring 10 can be attached thereto. Furthermore, as shown in the figure, the operating rod 2 is inserted through the switch case 7 from one side wall to the opposite side wall so as to be freely pushable. A rectangular hole 2b is formed for mounting. 3 is a movable plate. The movable platen 3 is made of an insulating member, and is fitted onto the operating rod 2 in the switch case 7 so as to be driven integrally with the movement of the operating rod 2.

The movable platen 3 has, for example, a movable contact piece 6 fixed to the upper surface side facing the base 9, and furthermore, a lock pin 4 is fixed at a predetermined position on the upper surface in the vertical direction orthogonal to the moving direction of the operating rod 2. A guide hole 3a is formed through the lower surface of the guide hole 3a, into which the guide hole 3a is inserted so as to move forward and backward freely. 4
is a locking pin. The lock pin 4 is, for example, in the shape of a rod of a predetermined length with both end surfaces rounded into spherical shapes, and is inserted into a guide hole 3a drilled in the upper surface of the movable plate 3, and one end on the upper surface side is connected to a plate. Spring 5
The guide groove 8 of the cam disk 8 on the lower side is
It is pressed into a. However, the lock pin 4
The other end of the push button 1 is engaged with a guide groove 8a of a cam disk 8 mounted on the switch case 7.
The operating rod 2 is moved by the push button, and the movable platen 3 is moved.
When the lock pin 4 is integrally driven to a predetermined position, the lock pin 4 engages with the guide groove 8a of the cam disk 8, thereby forming a mechanism for locking the push stroke at a predetermined push stroke position. 5 is a leaf spring. The leaf spring 5 presses one end of the lock pin 4 inserted into the guide groove 8a of the cam disc 8 with a predetermined pressure so that the other end of the lock pin 4 inserted into the guide groove 8a of the cam disc 8 does not come out of the guide groove 8a. It is fixed to the top side of the.

6 is a movable contact piece. The movable contact piece 6 has a base 9 fixed to the upper surface of the opening 7a of the switch case 7.
In order to form a predetermined electric circuit by slidingly contacting fixed contacts (not shown) of the arm, a plurality of arm pieces each having a contact 6a formed at one free end are provided, and the other end is fixed to the movable platen 3. ing. 7 is a switch case. The switch case 7 is, for example, a bottomed case with an opening 7a formed in the upper surface and surrounded on all sides, and an operating rod 2 is provided on one opposing side wall.
hole 7b for inserting and holding the push button freely,
7c is drilled, and a cam disk 8 is provided at a predetermined position on the bottom surface to allow the cam disk 8 to be removably inserted and locked.
A recessed hole 7d adapted to the above is formed. Further, the upper end surface of the opening 7a is formed to fix the base 9.

8 is a cam disc. The cam disc 8 has, for example, an angular trapezoidal upper surface as shown in FIG. 2, and a guide groove 8a wound approximately in a heart shape is formed at a predetermined depth on the upper surface. When the other end of the lock pin 4 is elastically inserted into the guide hole 3a of the movable plate 3 and is moved into the guide groove 8a of the cam plate 8 in a substantially upright position, the lock pin 4 always moves in one direction. It is formed so as to move along the guide groove 8a. Further, a protrusion 8b is formed on one end surface of the cam disk 8, and the front end surface of the movable disk 3, which is driven by the push button 1, is brought into contact with the protrusion 8b to form a stopper surface. .

Here, the approximately heart-shaped guide groove 8 of the cam disc 8 is
The size of a and the position of the protrusion 8b can be freely formed to suit the desired stroke of the push button switch.

9 is the foundation. The base 9 is made of an insulating material and is fixed to the upper end surface of the opening 7a of the switch case 7. Fixed contacts are provided at predetermined positions on the inner surface according to the desired electrical circuit, and movable contacts are provided at predetermined positions on the inner surface. It is formed to open and close an electric circuit by sliding contact with the piece 6, and is further provided with a plurality of terminals (not shown) on the top surface. 10 is a spring. The spring 10 always moves in the direction of arrow A shown in FIG. 1 in order to automatically return the push button 1.
This urges the operating rod 2 in the direction shown in FIG.

(5) Effects of the present invention will be explained using an embodiment shown in FIG. When the push button 1 is pushed against the bias of the spring 10, the movable platen 3 mounted on the operating rod 2 is both driven in the direction of arrow B. At this time, the lock pin 4, which is held by the movable platen 3 and whose other end is inserted into the guide groove 8a of the cam plate 8, moves from a point a shown by an imaginary line in FIG. 2 to a substantially heart-shaped guide groove 8a. At the position where the movable platen 3 passes through one side and reaches the position b, the front end surface of the movable platen 3 abuts against the projection 8b of the cam platen 8, and becomes a stopper for push operation. When the push button 1 is released, the operating rod 2 and the movable plate 9 are pushed back by the bias of the spring 10, but the other end of the lock pin 4 is inserted into the guide groove 8a of the cam plate 8. Therefore, it is guided by the guide groove 8a and stopped at a point C in the trough in the center of the heart shape. Thus, the contact point 6a of the movable contact piece 6 comes into contact with a predetermined fixed contact point of the base plate 9, thereby closing a desired electric circuit and forming a switch ON state.

Next, when the push button 1 is pressed again, the lock pin 4 is guided by the guide groove 8a and moved to the position d, at which point the front end surface of the movable plate 3 again hits the protrusion 8b of the cam plate 8. This serves as a stopper for the push button 1, and when the push button 1 is released, the lock pin 4 is guided from the position d to the guide groove 8a on the opposite side from when the push button was operated for the first time, and returns to the original position a. Will be reinstated. That is, the lock pin 4 rotates once within the guide groove 8a, and the push button switch
It is returned to the OFF state. That is, if we explain the above operation in place of the displacement of the operation position of the push button 1 as shown in FIG. 1, when the push button is operated from the OFF position It collides with the protrusion 8b and is stopped.
At this time, the lock pin 4 is located at point b of the cam disc 8,
The pressure of the push operation is applied to the movable plate 3 and the cam plate 8 almost immediately before the lock pin 4 hits the wall of the guide groove.
Since the lock pin 4 collides with the protrusion 8b, no extreme pushing force is applied to the lock pin 4, and the lock pin 4 is stopped.

When the push button 1 is released, the lock pin 4 of the movable plate 3 is locked at the C point of the cam plate 8 as described above, so the push button 1 is locked at the Z point and the predetermined electric circuit is activated. It is something that is formed and maintained. Next, when the push button 1 is pushed again, the push button 1 is pushed to the position Y point again, and the front end surface of the movable plate 3 hits the protrusion 8b of the cam plate 8 again and is stopped. At this time, the lock pin 4 moves to the position d of the cam disk 8, but the movable plate 3 and the protrusion 8b of the cam disk 8 collide with each other almost immediately before it collides with the wall surface of the guide groove 8a. Therefore, the lock pin 4 will not receive any impact during extreme pushing. When the push button 1 is released from the position Y, the button returns to the original position X. As described above, the protrusion 8b that serves as a stopper for the push operation of the push button 1 can be fitted to the cam plate 8 to match the desired push stroke, and the position of the protrusion 8b can be selected and installed together with the cam plate 8. It has a function that allows a reliable stopping position to be set without deforming the lock pin 4 that is locked at a predetermined position.

(6) Effects of the present invention The protrusion that acts as a stopper is formed on the cam disc, which can be freely attached and detached, to adapt to various push operation strokes depending on the desired electric circuit, purpose of use, and mounting location. To provide a high-quality push button switch which can be easily made by replacing only the cam disk, and which can perform reliable switching work without damaging the lock pin.
The leaf spring for biasing the lock pin is in the form of a thin plate and occupies less space, so that the switch case and movable platen can be made thinner. Since the leaf spring presses the end of the lock pin, the shape of the lock pin can be simplified and the length of the lock pin can be shortened. Since the lock pin is loosely inserted into the movable platen so that it can move, the lock pin can easily slide in the guide groove. Since the movable contact piece is disposed on substantially the same plane as the leaf spring, the area occupied by the leaf spring and the movable contact piece can be narrowed, and the switch case and switch can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a push button switch according to the present invention. FIG. 2 is a perspective view showing an embodiment of the cam disc of the push button switch according to the present invention. 1...Push button, 2...Operation rod, 3...Movable plate, 4
...Lock pin, 7...Switch case, 8...
cam board.

Claims (1)

[Scope of utility model registration request] An operating rod that is moved by pushing a push button, a spring for automatically returning the operating rod, a movable plate supported by the operating rod, and a movable plate that swings and slides as the operating rod moves. A lock pin, a leaf spring fixed to the movable platen and pressing the lock pin, a movable contact piece fixed to the movable platen, a board forming an electric circuit in correspondence with the movable contact piece, and the lock pin. a cam disc having a protrusion that serves as a stopper to lock the movable disc in a predetermined position and restrict the push button operation position by engagement with the cam disc, and a switch case in which the cam disc is detachably installed. A push button switch consisting of.