JPH0680568B2 - Rotary touch switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotary push switch used for electrical equipment of an automobile, in which modes are switched by a push operation.

(Prior Art) Conventionally, this type of rotary push switch has a ratchet wheel having a movable contact that can be switched for each pitch rotation, and a pulling jaw that is biased by a spring or the like in a direction to engage with teeth of the ratchet wheel. Or a feed member which has a push claw and is configured to feed the teeth of the ratchet wheel in response to a push operation, and engages with the pull claw or the push claw by one push operation of pushing and pushing back. The teeth of the car rotate one pitch to switch the contacts.

(Problems to be Solved by the Invention) However, the conventional rotary push switch described above requires a separate means for urging the pulling claw or the pushing claw of the feed member in the direction of engaging the teeth of the ratchet wheel. , The structure is complicated. Also, since the feed member is always biased,
There is a problem that the push operation becomes heavy.

The present invention has been made in view of such problems, and an object thereof is to provide a rotary push switch that has a simple structure and can be switched by a light push operation.

(Means for Solving Problems) In order to solve the above problems, the present invention has a ratchet wheel having a movable contact that can be switched for each pitch rotation, an operation knob urged in a push-back direction, and A slider that slides in response to a push-in / push-out operation of an operating knob, a first lever provided with a pulling claw that engages with a tooth groove of the ratchet wheel, and an elastic second lever that abuts on a tip of the ratchet wheel. In addition, the first lever of the feed member is composed of a feed member that is integrally formed into a generally L-shape and is rotatably attached to the slider at a bent portion thereof, with the operation knob being pushed back. The second pawl is formed so as to engage with the tooth groove of the ratchet wheel, and at the same time, the second lever urges and contacts the tooth tip of the ratchet wheel.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a ratchet wheel 1 has two movable contacts 2 that are interlocked with the ratchet wheel 1. The ratchet wheel 1 is rotatably mounted inside a case 3 and the contacts are switched every one pitch rotation thereof. Can be switched.

An upper end of the operation knob 4 is rotatably supported by a hinge 5 on the front surface of the case 3, and a stopper 6 is provided at the lower end to prevent the operation knob 4 from coming out. Then, the ball 8 and the first spring 9 which is compressed and biased are inserted into the through hole 7 provided in the case 3 between the ratchet wheel 1 and the operation knob 4, and the ball 8 is moved to the ratchet wheel 1 side by the first spring 9. The operation knob 4 is biased outwardly while being locked in the tooth groove. Therefore, the rotation of the ratchet wheel 1 is restrained at a predetermined torque or less, and the position of the movable contact 2 is fixed, and the operation knob 4 can be pushed and pushed back.

The slider 10 is slidably provided on the inner lower surface of the case 3, a second spring 11 is mounted between one end of the slider 10 and the case 3, and the other end is urged to abut the lower end of the operation knob 4. Therefore, the slider 10 is adapted to slide by the push operation of the operation knob 4.

The feed member 12 has a pulling claw 13 at the tip thereof in the first horizontal direction.
A generally L-shaped member composed of a lever 14 and a second elastic vertical lever 15, and is rotatably attached to the slider 10 by a support shaft 16 provided at the bent portion of the L-shaped member. 4, the pulling pawl 13 engages with the tooth groove of the ratchet wheel 1, and at the same time, the tip of the second lever urges the tip of the ratchet wheel 1 to come into contact. Reference numeral 17 is a display unit for displaying the mode switching.

In the rotary push switch having the above structure, when the operation knob 4 is pressed, a rotational torque is applied to the ratchet wheel 1 via the slider 10 and the pulling claw 13 to press the ball 8. When this rotational torque overcomes the spring reaction force of the first spring 9 that holds the ball 8 in the tooth groove of the ratchet wheel 1, the tooth of the ratchet wheel 1 pushes the ball 8 back. Therefore, when the pressing force of the operation knob 4 is increased and pushed in, the slider 10 slides to feed the teeth of the ratchet wheel 1 and the ball 8 is pushed back, as shown in FIG. At this time, the biasing force of the second lever 15 weakens as the slider 10 moves, and eventually the slider 10 separates from the ratchet wheel 1. Then, at the moment when the ball 8 passes over the tooth tip of the ratchet wheel 1, the component of the rotational torque that presses the ball 8 disappears, and as a result, the ball 8 is fitted into the adjacent tooth groove by the biasing force of the first spring 9 and the ratchet wheel. 1 is rotated by 1 pitch and movable contact 2
Switches to the new mode (Fig. 3). Here, when the pushing operation of the operation knob 4 is stopped, the rotation torque disappears,
As shown in FIG. 3, the pulling claw 13 of the first lever 14 and the ratchet 1
The engagement with the teeth of the first lever 14 is released, and the first lever 14 tilts due to its own weight.

Subsequently, when the pressing on the operation knob 4 is stopped, the operation knob 4 and the slider are moved according to the urging force of the first spring 9 or the second spring 11.
10 is pushed back. Here, while the slider 10 is pushed back, the second lever 15 comes into contact with the tip of the ratchet wheel 1. Therefore, the first lever 14 is lifted as the slider 10 moves, and the pulling claw is moved.
13 engages the ratchet 1. Further, the second lever 15 is bent to increase the biasing force to the ratchet wheel 1, and accordingly
In the state in which 13 is securely engaged with the teeth of the ratchet wheel 1, the mode switching by one push operation is completed.

As described above, the second lever 15, which is the urging means for ensuring the engagement of the pulling claw 13 of the feeding member 12 with the ratchet wheel 1, is integrally formed with the feeding member 12 and has a simple structure. ing. Further, once the engaging relationship between the pulling claw 13 and the ratchet wheel 1 is formed,
As the rotational torque is applied to the ratchet wheel 1 through the engaging portion by the push operation, the engaging relationship is not broken even if the pulling pawl 13 has no biasing means. The second lever 15, which is a means, is separated from the ratchet wheel 1 during the push operation so as not to be urged. On the other hand, even when the operation knob 4 is being pushed back, the second lever 15 merely causes the first lever 14 to guide the engaging state of the pulling claw 13 and the ratchet wheel 1, and the pushing back operation is completed. Immediately before this, the second lever 15 bends and an urging action for maintaining the engaged state is performed. Therefore, there is no resistance due to the biasing action at the time of pushing in and pushing back, as compared with the conventional one having the pulling claw that is always biased in the direction of engaging the ratchet wheel, and the push operation becomes extremely smooth. .

(Effects of the Invention) As is apparent from the above description, according to the present invention, the structure is simple, the number of parts is small, and the assembly is easy, and the push operation is extremely smooth, and the switch operation can be performed by a light push operation. It has the effect that it becomes possible.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary push switch according to the present invention, and FIGS. 2 to 4 are sectional views showing a series of operations thereof. DESCRIPTION OF SYMBOLS 1 ... Claw wheel, 2 ... Movable contact, 4 ... Operation knob, 9 ... First spring, 10 ... Slider, 11 ... Second spring, 12 ... Feed member, 13 ...
Pulling claw, 14 ... 1st lever, 15 ... 2nd lever.

Claims (1)

[Claims] 1. A claw wheel having a movable contact that can be switched at every 1-pitch rotation, an operation knob biased in a push-back direction, and a slider that slides in response to a push-in or push-back operation of the operation knob. A first lever provided with a pulling pawl that engages with a tooth groove of the ratchet wheel and an elastic second lever that abuts on a tooth tip of the ratchet wheel are formed integrally in a generally L-shape, and at a bent portion thereof. A feed member rotatably attached to the slider,
With the operation knob pushed back, the first of the feeding member
At the same time that the pulling claw of the lever engages with the tooth groove of the ratchet wheel,
A rotary push switch, wherein the second lever is formed so as to urge and contact the tooth tip of the ratchet wheel.