JPH061652B2 - Drive device for delay switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention is used as a switch for an exhaust fan of a toilet, etc., and when a power line is turned off or on manually or automatically, a desired time after this operation is set. The present invention relates to a drive device used for a delay switch that is turned on or off after a lapse of time.

[Background technology]

In the conventional delay switch, a delay time is taken by a combination of an oil dump pot and a magnet. Therefore, the delay time cannot be secured unless the power is turned on for a certain time. There are drawbacks such that the delay time changes when the temperature changes, the delay time changes when the surrounding metal changes because the magnet is used, and the delay time changes depending on the mounting direction. In addition, due to its structure, it could not be made smaller than the module for two large polygons.

Therefore, in order to solve this problem, a cam that opens and closes the contact by a forward and reverse rotation operation and a coil spring that gives a biasing force to the cam that is normally rotated by the handle in the reverse direction A delay switch having a delay unit for controlling the rotation speed of the cam and a drive piece for transmitting the rotation motion of the cam to the contact spring has been developed.

In this delay switch, it is important to make the cam of the drive device that opens and closes the contact point perform stable forward rotation.

[Object of the Invention]

In view of the above points, an object of the present invention is to provide a drive device for a delay switch that allows a cam to perform a stable forward rotation.

[Disclosure of Invention]

In order to achieve the above-mentioned object, the present invention provides a cam that opens and closes a contact by a forward / reverse rotation operation and a biasing force for forwardly rotating a cam that is reversely rotated by a handle. The coil spring is provided with a delay unit for suppressing the rotational speed of the cam, and the coil spring is
One end of the coil spring is fixed to an extension part that extends upward from the delay unit, and the other end is fixed to a cam. The extension direction of the coil spring is centered on the rotation fulcrum of the cam and the cam fixing of the coil spring is performed. The gist of this invention is a drive device for a delay switch, which is arranged so as to be substantially along a tangent line of this fixed point of a rotation locus including points. This will be described in detail below with reference to the drawings showing a delay switch using one embodiment of this driving device.

As shown in FIGS. 1 to 4, a delay unit 20 is provided at the center of the box-shaped switch body (body) 10.
Insulating plates 30 and 31 sandwiching the upper and lower surfaces thereof
Is provided. By providing the insulating plates 30 and 31, heat from other portions is blocked so that the frame of the delay unit 20 made of a thermoplastic resin does not burn even if heat is applied.

On the front of the delay unit 20, two cams 40 and 41 are provided.
However, the fulcrum 21 of the rotation provided on the casing of the delay unit 20 is mounted so as to be eccentric from the transmission shaft 22 of the delay unit. An arcuate notch 42 centered on the fulcrum 21 is formed on the cam 40 closer to the delay unit, and a tooth portion 43 is formed on the edge near the fulcrum 21.
Is formed so as to mesh with the gear 23 fixed to the transmission shaft end of the delay unit. Notch 42
Is formed so as not to interfere with the gear 23 of the delay unit and its cover when the cam 40 is rotated. Between the cam 40 delay unit 20, one end is a protrusion 46 formed on the back surface of the cam 40, and the other end is a protrusion 25 of an extension portion 24 extending upward from the delay unit 20.
A coil spring 50 fixed to is attached. The cam 40 is always biased by the coil spring 50 in the forward rotation direction (the direction of the arrow in the drawing).

As shown in FIG. 3, the extension direction of the coil spring 50 is centered on the rotation fulcrum 21 of the cam 40, and the rotation locus X of the cam including the protrusion 46 to which the coil spring is fixed.
Of tangential line L at this fixed point. With this configuration, the coil spring that constantly biases the cam in the positive rotation direction always expands and contracts while maintaining the substantially constant direction and position even during the rotation operation of the cam.
The positive rotation of the cam is accurate and stable. Further, if one end of the coil spring 50 is provided in the extending portion extending upward from the delay unit 20, a long coil spring can be used, and the pulling force of the spring can be increased.

There is a large cutout 4 on the cam 41 far from the delay unit.
5 is formed so that when the cam 41 is rotated like the cam 40, the gear 23 of the delay unit and its cover are prevented from interfering with each other. The peripheral edge of the large notch 45 farther from the fulcrum 21 bulges in an arc shape, and the protrusion 44 formed on the front surface of the cam 40 enters the bulging portion 45a. Even when the cam 40 rotates forward and backward, the cam 41 does not follow the movement of the cam 40 as long as the protrusion 44 moves in the bulging portion 45a. However, when the projection 41 abuts against the end edge 46a or 46b of the bulging portion 45a, the cam 41 rotates forward and backward in accordance with the movement of the cam 40.

Locking springs 61a, 6a are provided on both sides of the switch body 10.
1b, release buttons 62a and 62b, and terminal plates 63a and 63
b and 63c are respectively housed at the positions shown by the broken line arrows in FIG. The terminal plates 63a and 63b have separate fixed contacts 64a and 64b, respectively, and form different contact mechanisms within one switch. One end of a plate-shaped contact spring 70 is joined to the terminal plate 63c.
A pressing element 71 made of an insulating material is fixed to the central part of the, and a movable contact 72 is formed at the lower end of the tip. Pusher 71
Is constantly urged by the elastic force of the contact spring 70 in the direction of coming into contact with the peripheral edges of the cams 40, 41. And always
As shown in FIG. 3, the notch 47 formed in the cam 41
It is inside. As will be described later in detail, the pusher 71 moves up and down by the forward and reverse rotation of the cams 40 and 41 and the elastic force of the contact spring 70, and the movable contact 72 causes the movable contact 72 to move.
It is adapted to be attached to and detached from the fixed contact 64a of 3a. Further, the lead plate 65 is joined to the upper surface of the terminal plate 63c, and the notch 73a of the rocking body 73 is formed in the rising portion 66a (there are two) on the side of the convex portion 66 formed at the tip of the lead plate.
(There are two) are engaged, with this convex portion 66 as a fulcrum,
The oscillating body 73 oscillates, so that the movable contact 74 formed on the lower surface of the tip of the oscillating body and the fixed contact 64b of the terminal plate 63b are attached and detached.

By the way, in order to assist the urging force of the contact spring 70, it is conceivable to fix one end of the coil spring 50 to the pusher (driving piece) 71. But if you do that,
With the rotation of the cam, the traction force of the pressing element by the coil spring increases, the pressing force of the pressing element 71 on the cam increases, the frictional resistance increases, and the turning force of the cam weakens.
It may happen that the friction force of the presser 71 cannot be overcome. That is, the rotation of the cam may stop. On the other hand, when the one end of the coil spring 50 is fixed to the delay unit 20 as in the drive device according to the present invention, such a situation can be prevented.

A rectangular cover 80 is covered on the switch main body 10, and the cover 80 and the switch main body 10 are combined to form a vertical frame 8.
It is designed to be assembled by 1. Cover 8
Recesses 82 are formed on the front and rear inner side surfaces of 0. A window 91 is formed in the handle 90, and a transparent lid 92 that closes the window 91 is attached. Then, a transparent card cover 93 is fitted in the handle 90 with the card 94 interposed therebetween. The handle 90 is stored in the cover 80,
The concave portion 82 engages with a vertically long convex portion 95 formed on the front and rear surfaces of the handle and serves as a swing fulcrum of the handle 90. A coil spring 96 is fitted on the lower surface of the handle and is received by the spring support portion 75 of the rocking body 73. The oscillating body 73 is inclined by the action of the spring 96 in the direction opposite to the direction in which the handle is inclined. The handle 90 is securely fixed at that position by the restoring force of returning to the straight state. That is, the switch button is a tumbler button.

The neon lamp 97 is connected to the terminal plates 63a and 63c, respectively, and is always lit. Since this light leaks out through the transparent lid 92, the position of the switch can be easily confirmed even in the dark. The entire switch is sized so that it can be stored in the module for one large polygon.

FIG. 3 shows the off state of the switch, and from this state, the right side of the handle 90 is pushed to tilt the handle in the opposite direction. Then, the oscillating body 73 is tilted in the opposite direction, the movable contact 74 formed on the oscillating body contacts the contact 64a on the terminal plate 63b, and the electric path is turned on.
At the same time, the convex portion 90a formed on the lower portion of the handle causes the cam 4 to move.
0 The upper convex portion 40a is pushed to forcibly rotate the cam 40 around the fulcrum 21. After a certain stroke, the projection 44 of the cam 40 collides with the bulging portion one end 46a of the cam 41, and the cam 41 is moved together.

The peripheral portion 40b of the cam 40 with which the pressing element 71 of the contact spring contacts
Is the distance between the contact point of the pressing element 71 and the rotation fulcrum 21, the cam 40 is forcedly rotated (reverse rotation) against the urging force of the coil spring 50, and the projection 44 is the bulging portion of the cam 41. One end 4
It is inclined so that it gradually increases until it abuts against the other end 46a away from 6b. Therefore, the pusher 71
Is pushed down by the reverse rotation of the cam 40. Then, the cam 40 causes the cam 41 to follow the reverse rotation when the projection 44 is reversely rotated to a position where it abuts against the other end 46a.
Since the pusher 71 is sufficiently lowered by the inclined peripheral edge 40 b of the pusher 71, the pusher 71 gets over the step between the peripheral edge 41 a of the cam 41 and the notch 47, and the peripheral edge 41 a.
You can move to the position where you touch. The pusher 71 is the cam 4
When pushed down in this way by 0, 41, the contact 72 of the contact spring contacts the contact 64a of the terminal plate 63a,
This electric circuit is turned on.

As described above, the state shown in FIG. 5 is obtained. When the left side of the handle 90 is pushed from the state of FIG. 5, the handle 90 is in the state shown in FIG. 3, and the protrusion 90a of the handle is released from the protrusion 40a of the cam 40, so the restoring force of the coil spring 50 is increased. Thus, the cam 40 rotates forward to return to the state shown in FIG. At this time, the speed of the cam 40 is controlled by the action of the delay unit 20, and the cam 40 makes a positive rotation in the arrow direction. As the cam 40 rotates forward, the pusher 4
When 1 reaches the position of the peripheral edge 40b of the cam 40, the pusher 71
Moves away from the peripheral edge of the cam 40 and remains only on the peripheral edge of the cam 41. After a predetermined time, when the protrusion 44 of the cam 40 comes into contact with the one end 46b of the bulging portion of the cam 41,
The cam 41 comes to be moved together with the cam 40. At this time, since the notch 47 is formed in the cam 41, when this portion comes to the position of the presser 71, the presser 71 is formed.
Suddenly loses its support and enters the notch 47 due to the restoring force of the contact spring 70. Then, the contact 72 is quickly separated from the contact 64a, and the electric path is turned off. Contact 72,
This quick opening / closing operation improves arc breakage.

In this embodiment, the mechanism is turned off after a predetermined time, but the fixed contact of the terminal board is provided above the movable contact of the contact spring so that it is turned on after a predetermined time. Good.

This switch is used, for example, in a switch of a toilet or the like so that the terminal on the rocking body 73 side is connected to illumination and the terminal on the contact spring 70 side is connected to a ventilation fan. By doing this, during use, the ventilation fan is turned on and the ventilation fan is turned, and when the lighting is turned off after use, the ventilation fan will stop after a predetermined time, so the ventilation fan was immediately stopped. It is possible to obtain the effects of eliminating the inconvenience that sometimes occurs and preventing forgetting to turn off the ventilation fan. The switch can be used in various places other than the toilet. The lag time may be set according to the purpose of use, but may have a structure that cannot be adjusted.

The delay unit used in the present invention delays (delays) the positive rotation of the cam by utilizing the eddy current generated in the conductor plate by placing different poles of the magnets facing each other and placing a conductor plate such as a copper plate therebetween. ) A mechanism may be used, or a mechanism that delays by a combination of a gear train and a motion plate may be used.

〔The invention's effect〕

In the delay switch drive device according to the present invention, since one end of the coil spring that normally rotates the cam is fixed to the delay unit, the traction force of the pressing element by the coil spring increases as the cam rotates, and the cam rotation is increased. It is possible to stabilize the forward rotation of the cam for surely performing the contact opening / closing operation of the switch without increasing the frictional resistance for stopping the movement and finally stopping the cam.

In particular, since one end of the coil spring is fixed to the extension part that extends upward from the delay unit, the coil spring can be sufficiently taken, the pulling force of the spring is increased, and the positive rotation of the cam is prevented. It can be done reliably and quickly.

Moreover, since the extending direction of the coil spring is centered on the rotation fulcrum of the cam and is substantially along the tangent line of the rotation spring including the cam fixing point of the coil spring at this fixing point, The increased traction force of the spring efficiently acts in the direction of normal rotation of the cam, and moreover, normal rotation of the cam can be further stabilized satisfactorily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a delay switch in which a drive device according to the present invention is used, FIG. 2 is a plan view showing the internal structure of the same as the assembled state, FIG. 3 is a front sectional view of the same, and FIG. FIG. 5 is a side sectional view of the same as above, and FIG. 5 is a front sectional view showing a state after the handle is tilted in the opposite direction from the state of FIG. 10 ... Switch main body 20 ... Delay unit 40, 41
... Cam 50 ... Coil spring 63a, 63b, 6
3c ... Terminal plates 64a, 64b ... Fixed contacts 70 ... Contact springs 72,74 ... Movable contacts 73 ... Oscillator 80 ... Cover 90 ... Handle

Claims (1)

[Claims] 1. A cam that opens and closes a contact by a forward and reverse rotation operation, a coil spring that gives a biasing force to the cam that is reversely rotated by a handle in the forward direction, and a coil spring of this cam. The coil spring is provided with a delay unit for controlling the rotational speed, one end of the coil spring is fixed to an extending portion extending upward from the delay unit, and the other end is fixed to a cam. A drive device for a delay switch having a rotation locus centered on a rotation fulcrum of the cam and including a cam fixing point of the coil spring, and being substantially along a tangent line at the fixing point.