JPH0218507Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a delayed operation switch that opens and closes its contacts after a certain delay time from the time of switch operation.

For example, the delay switch in Utility Model Application No. 52-53378 is
The viscous resistance of the fluid is used to determine the delay time. However, with such fluid type devices, the viscous resistance of the fluid fluctuates with changes in temperature, so the delay time varies widely, a fluid seal is required, and a strong magnetic force is required for operation. Because of this, operability is poor.

Furthermore, the delay operation switch device disclosed in Japanese Patent Publication No. 53-31268 uses a clock mechanism to set the delay time. However, such mechanical clock mechanisms require many gears and other parts.
A special clutch is required to reduce the burden of on/off operations, and the escapement mechanism for regulating speed generates operating noise.

Therefore, the purpose of this invention is to reduce the number of parts,
Moreover, it is an object of the present invention to provide a delay-actuated switch that does not require a special clutch mechanism and has low operating noise.

Based on the above object, the present invention restricts the operating knob to two positions with a click spring, uses the biasing force of the click spring to accumulate a coil spring as a driving source, and when the partial gear returns, The movement opens and closes the movable contact piece via the cam lever,
Furthermore, when the delay is activated, the return force of the coil spring is converted into rotational motion by the speed-increasing gear train, this rotational motion is transmitted to the braking means, and the rotational braking force of this braking means is used to determine the delay time. I have to. Furthermore, since the above-mentioned partial gears are supported in a detachable manner from the speed-increasing gear train via a freely displaceable intermediary gear, the knob switch can be operated while being separated from the speed-increasing gear train's meshing system. In other words, it can be done with light operation.

Hereinafter, the structure and operation of the present invention will be specifically explained based on an embodiment shown in the drawings.

First, FIGS. 1 and 2 show a delay actuation switch 1 of the present invention. The delayed actuation switch 1 includes a knob 2, a partial gear 3, a cam lever 4, an intermediate gear 5, and a brake member 6 as main parts. The knob 2 is located inside the main body 7 and is rotatably supported by a support shaft 8 at an opening.
It is selectively stabilized in two positions by a click spring 9: an off position (FIG. 1) and an on position (FIG. 2). Note that the rotation angle of the knob 2 is
The click spring 9 is provided between the spring receiver 12 of the knob 2 and the spring receiver 13 of the main body 7, with the point as a boundary. There is.

Similarly to the knob 2, the partial gear 3 is connected to the support shaft 8.
The main body 7
It is stopped when it hits the stopper 15. A radial contact portion 1 is formed on the side surface of this partial gear 3.
6 and an arcuate guide surface 17 are formed,
The contact portion 16 corresponds to a pressing piece 18 integrally formed on the lower end portion of the knob 2, and the guide surface 17 corresponds to the cam piece 20 of the cam lever 4. This cam lever 4 is approximately Y-shaped and rotatably supported on the shaft 19 of the main body 7, with a cam piece 20 at one end corresponding to the guide surface 17, and a pressing protrusion 21 at the other end. It corresponds to the movable contact piece 10. This movable contact piece 10 corresponds to a fixed contact piece 23 fixed inside the main body 7,
It is supported by a snap spring 22 between a portion of the main body 7 and a terminal plate 24 fixed inside the main body 7 in a flexibly deformable state. The fixed contact piece 23 and the terminal plate 24 are electrically connected to an electrical device to be controlled.

On the other hand, the intermediate gear 5 is a composite gear, and is movably supported by a movable shaft 25 inside the elongated hole 26 of the main body 7. This elongated hole 26 is formed in an arc shape around the rotation center of the partial gear 3, that is, the support shaft 8. Large gear 5a of intermediary gear 5
is in a position where it can mesh with the small gear 27b of the gear 27, and the large gear 27a of this gear 27 meshes with the small gear 28b of the gear 28. It is engaged with the worm 30. These gears 2
7, 28 and the worm 30 form a speed increasing wheel train 31.

The brake shaft 29 is rotatably supported between a bearing hole 33 of a fixed cup 32 fixed inside the main body 7 and a bearing hole 34 of the main body, and is supported between a press-fit collar 35 and a press-fit plate 36. A friction plate 37 is held. As shown in FIG. 3, this friction plate 37 is formed of rubber or the like in a Z shape, and integrally forms a pair of weight portions 38. As shown in FIG. This weight portion 38 is displaced in the diametrical direction by the centrifugal force caused by the rotation of the brake shaft 29, and is in a state where it can come into frictional contact with the inner circumferential surface 39 of the fixed cup 32.

Next, the operation of the delay activation switch 1 will be explained.

When the knob 2 is rotated counterclockwise, the delayed actuation switch 1 is set to the off state, and therefore the movable contact piece 10 and the fixed contact piece 23
are in a non-contact state as shown in FIG.

Then, when the operator turns the knob 2 clockwise, the knob 2 attains a new stable state in a fully rotated state due to the action of the click spring 9, as shown in Fig. 2, and remains in a stopped state. becomes. The operating force of the knob 2 at this time is sufficient as long as it overcomes the elasticity of the click spring 9. In the process of rotating the knob 2 clockwise, the pressing piece 18
It hits the abutting portion 16 and rotates the partial gear 3 clockwise against the elasticity of the torsion coil spring 14. When the spring receiver 12 exceeds the point, the click spring 9 overcomes the elasticity of the torsion coil spring 14 and forcibly rotates the knob 2 and the partial gear 3 clockwise. The elasticity does not become a load during operation. When the partial gear 3 rotates counterclockwise, the intermediate gear 5 is moved leftward in the drawing along the elongated hole 26, so the large gear 5a of the intermediate gear 5 separates from the gear 27 and moves to the small gear 27b. They no longer mesh together.

On the other hand, the end of the guide surface 17 hits the cam piece 20 and rotates the cam lever 4 counterclockwise, so the pressing protrusion 21 of the cam lever 4 presses the snap spring 22 and causes the snap action. By inverting the movable contact piece 10 to the fixed contact piece 23, the movable contact piece 10 is brought into contact with the fixed contact piece 23. In this way, the delayed activation switch 1 is set to the on state immediately after the knob 2 is operated. In this on state, no force is applied to the intermediate gear 5 and the gears 27, 28.

If delayed activation switch 1 is set to OFF after this, after a certain time delay, delayed activation switch 1 will be turned off.
is set to the off state. That is, knob 2
When is rotated counterclockwise, the pressing piece 18 separates from the contact portion 16, so the partial gear 3 is biased by the accumulated force of the torsion coil spring 14.
The intermediate gear 5 is rotated counterclockwise and moved rightward in the drawing along the elongated hole 26 of the intermediary gear 5, and the large gear 5a is engaged with the small gear 27b of the gear 27.
A clockwise rotational force is applied to the intermediate gear 5. In this way, the intermediary gear 5 is accelerated by the gears 27, 28 and the worm 30 using the return force of the torsion coil spring 14 as a driving force, and the brake shaft 29
transmits rotational force to. When the brake shaft 29 is rotating, the weight portion 38 of the friction plate 37 comes into frictional contact with the inner peripheral surface 39 of the fixed cup 32 due to centrifugal force, and applies a braking force to the rotation of the brake shaft 29. to adjust its rotation speed. Therefore, the partial gear 3 slowly rotates clockwise under the speed regulating function of the brake member 6. During this backward movement process, the guide surface 17 restricts the clockwise movement of the cam lever 4, so that the movable contact piece 10 and the fixed contact piece 23
remains in contact. However, when the end of the backward movement is reached, the guide surface 17 moves toward the cam piece 20.
The cam lever 4 is urged by the return force of the snap spring 22 and rotates clockwise about the shaft 19. At that point, the movable contact piece 10 and the fixed contact piece 23 are separated for the first time. The delayed activation switch 1 is set to the off state after a time delay. This delay time can be appropriately set depending on the speed increasing ratio and the braking force of the brake member 6.

In the above-mentioned embodiment, the brake member 6 is constituted by a rubber friction plate 37, but this brake member 6 may include other braking means that performs a braking action only against return movement, in addition to flight feathers, etc. You can also replace it with . Further, the movable contact piece 10 can also be constituted by an ordinary leaf switch without a click action. Further, the rotation speed increasing system may be composed of one or more gears.

The present invention provides the following unique effects.

The intermediary gear works in conjunction with the rotation of the partial gears to perform a kind of clutch action. Therefore, when the partial gear is moving forward, the intermediary gear is in a state where it can rotate while being separated from the speed-increasing gear train, and when the partial gear is moving backward, that is, during the delay operation, the intermediary gear meshes with the speed-increasing gear train. As a result, delayed operation is possible, and no special clutch or the like is required.

In addition to the function of the knob's click spring to stabilize the knob in two positions, it also generates a force that overcomes the biasing force of the partial gear, that is, the torsion coil spring, and the intermediate gear is separated from the speed-increasing gear train. The on operation can be performed with light force.

Furthermore, since no mechanical clock mechanism is provided for delay operation, the number of parts is small and the structure can be simplified.

In particular, when the partial gear moves forward, the cam lever is guided by the guide surface of the partial gear and rotates instantaneously, driving the movable contact piece to turn on the switch and turn the partial gear back. During the movement process, the guide surface restricts the rotation of the cam lever, and at the end of the return operation, the cam lever instantly detaches from the guide surface and rotates, so the separation of the movable contact piece and the fixed contact piece, that is, the off operation, is instantaneous. It will be held in As a result, the delay time of the delay operation is stabilized.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of the delay actuation switch of the present invention, and FIG. 3 is a plan view of the friction plate. 1...Delayed operation switch, 2...Knob, 3...
... Partial gear, 4 ... Cam lever, 5 ... Intermediate gear, 6 ... Brake member, 7 ... Main body, 8 ... Support shaft, 9 ... Click spring, 10 ... Movable contact piece, 1
4... Torsion coil spring, 22... Plate-shaped snap spring, 26... Long hole, 27, 28
... Gear, 29 ... Brake shaft, 31 ... Speed-increasing gear train, 37 ... Friction plate.

Claims (1)

[Scope of utility model registration request] A knob rotatably supported by the main body and selectively taking two positions by a click spring, a partial gear that is biased into contact with the knob and interlocks with the reciprocation of the knob, and a partial gear formed in the circumferential direction of the partial gear. a cam lever that is pushed by the guide surface during forward movement of the partial gear and rotates to the return position after coming off the guide surface at the end of the backward movement; a movable contact piece that comes into contact with the fixed contact piece until it returns; an intermediary gear that is freely displaceable in the moving direction of the partial gear and constantly meshes with the partial gear;
A delayed activation switch comprising: a speed-increasing wheel train that meshes with and rotates with the intermediary gear when the partial gear returns; and a brake member that is driven by the speed-increasing wheel train and generates rotational braking force. .