JPH061653B2 - Drive device for delay switch - Google Patents

Description

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

[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 it is turned on for a certain time, 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. There were drawbacks such as changes. Also, due to its structure, it cannot be made smaller than the module for two large polygons.

Therefore, in order to solve this problem, a cam that opens and closes the contacts by a forward / reverse rotation operation, and a coil that applies an urging force to the cam that is normally rotated by a handle in the reverse direction are applied to the cam. A delay switch has been developed that includes a spring, a delay unit that controls the rotational speed of the cam, and a drive piece that transmits the rotational movement of the cam to the contact spring.

It would be convenient if the stroke for opening and closing the contact mechanism could be increased without increasing the size of the whole.

[Object of the Invention]

In view of the above points, it is an object of the present invention to provide a delay switch drive device capable of increasing the contact drive stroke while enabling downsizing of the delay switch.

[Disclosure of Invention]

In order to achieve the above-mentioned object, the present invention comprises a cam that causes a contact mechanism to open and close a contact by a forward and reverse rotation operation, and a delay unit that suppresses the rotation speed of the cam. A rotation fulcrum is provided at a position distant from the transmission shaft of the delay unit, the contact mechanism is provided substantially at a position opposite to the rotation fulcrum of the cam with the transmission shaft interposed, and provided with a movable contact of the contact mechanism. The gist is a drive device for a delay switch in which a member is directly driven by a cam.
This will be described below in detail with reference to the drawings showing a delay switch using the embodiment.

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 and meshes with the gear 23 fixed to the transmission shaft end of the delay unit. Notch 42
Is formed so that the gear 23 of the delay unit and its cover do not interfere with each other when the cam 40 is rotated. Between the cam 40 and the delay unit 20, a coil spring 50 having one end fixed to a protrusion 46 formed on the back surface of the cam and the other end fixed to a protrusion 25 of an extending portion 24 extending upward from the delay unit 20. It is installed.
The cam 40 is urged by the coil spring 50 in the normal rotation direction (arrow direction in the drawing). On the other hand, the cam 41 far from the delay unit has a large notch 45.
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 44 collides with the end edge 46a or 46b of the bulging portion 45a, the cam 41 rotates forward and backward according to 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. Pressing force 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 rotations of the cams 40 and 41 and the elastic force of the contact spring 70, and accordingly, the movable contact 72 or the terminal plate 6
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 fixed contact 64b is attached to and detached from the movable contact 74 and the terminal plate 63b formed on the lower surface of the tip of the oscillating body.

A rectangular cover 80 is covered on the switch body 10, and the cover 80 and the switch body 10 are assembled into a 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 96 is inserted into the handle 90 with the card 94 sandwiched 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 the straight state of returning. That is, the switch button is a tumbler button.

The neon lamp 97 is connected to the terminal plates 63 and 63c, respectively, and is always lit. This light is transparent lid 9
Since it leaks out through 2, the position of the switch can be easily confirmed even in the dark. The entire switch is
It is sized so that it can be stored in a 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 with the reverse rotation of the cam 40. Then, when the projection 40 of the cam 40 is reversely rotated to a position where the projection 44 abuts on the other end 46a, the cam 41 is made to follow the reverse rotation. Since the pressing element 71 is sufficiently lowered by the peripheral edge 40b, the pressing element 71 can move over the step between the peripheral edge 41a of the cam 41 and the notch 47 and move to the position in contact with this peripheral edge 41a. it can. 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. As a result, 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, the protrusion 44 of the cam 40 becomes 4
When it comes into abutment with the one end 46b of the bulge portion 1, the cam 41 is 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 suddenly supports and the notch 47 due to the restoring force of the contact spring 70. Get in. Then, the contact 72 is quickly separated from the contact 64a, and the electric path is turned off. This quick opening action of the contact 72 improves arc breakage.

In this embodiment, the mechanism is such that it is turned off after a predetermined time, but the fixed contact of the terminal plate 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. If you do this, the lighting will be on and the ventilation fan will be turned during use, and when the lighting is turned off after use, the ventilation fan will stop after a predetermined time, so stop the ventilation fan immediately. It is possible to eliminate the inconvenience that may occur in the event of a fire, and to prevent 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 (slows) the forward 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 between them. ) A mechanism may be used, or a mechanism that delays by a combination of a gear train and a delay plate may be used.

〔The invention's effect〕

As described above, in the delay switch drive device according to the present invention, the rotation fulcrum of the cam is provided at a position separated from the transmission shaft of the delay unit, and the contact mechanism sandwiches the transmission shaft between the cams. Is provided almost at the opposite position of the rotation fulcrum of
The member having the movable contact of the contact mechanism is directly driven by the cam. In this type of delay unit, the transmission shaft is located approximately at the center of the unit by design in order to reduce the size of the unit as a whole. Therefore, when the rotation fulcrum of the cam is provided on the transmission shaft, the stroke of the pusher (driving piece) for driving the contact cannot be increased because it is restricted by the position of the transmission shaft. On the other hand, in the delay switch drive device according to the present invention, since the rotation fulcrum of the cam is separated from the transmission shaft, it can be arranged at a position farther from the transmission shaft when viewed from the position of the contact mechanism. As a result, the contact drive stroke can be increased. Further, the torque applied to the transmission shaft of the delay unit can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a delay switch in which an embodiment of 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, and FIG. 3 is a front view of the same. A sectional view, FIG. 4 is a side sectional view of the 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 21 ... Cam rotation fulcrum 22 ... Transmission shaft 40, 41 ... Cam 50 ...
Coil spring 63a, 63b, 63c ... Terminal plate
64a, 64b ... Fixed contact 70 ... Contact spring 72, 7
4 ... Movable contact 73 ... Oscillator 80 ... Cover 90 ... Handle

Claims (1)

[Claims] 1. A cam having a contact mechanism for opening and closing a contact by a forward and reverse rotation operation, and a delay unit for suppressing a rotation speed of the cam, wherein a rotation fulcrum of the cam transmits the delay unit. The contact mechanism is provided at a position distant from the shaft, and the contact mechanism is provided substantially opposite to the rotation fulcrum of the cam across the transmission shaft, and the member having the movable contact of the contact mechanism is directly driven by the cam. Drive device for delay switch.