JPH073767B2 - 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, etc., and when the electric path is turned off or turned on manually or automatically, after a desired time elapses after this operation. The present invention relates to a drive device for a delay switch which is turned on or off.

[Background technology]

A conventional delay switch is shown in FIG. As shown in the figure,
The drive device for the delay switch includes cams 40 and 41, a coil spring 50, and a delay unit 20. cam
40 and 41 are contact points 72 and 64a to the contact mechanism by the forward and reverse rotation operation.
The opening and closing operations of the contacts 72 and 64a are delayed relative to the operation of the handle 90 during the forward rotation. The coil spring 50 has a function of giving a biasing force to the cams 40 and 41 that is rotated in the reverse direction by the handle 90 to rotate the cams 40 and 41 in the forward direction. The delay unit 20 serves to suppress the rotational speed of the cams 40 and 41. The transmission of the restraining force is performed by meshing the gear 23 provided on the transmission shaft 22 of the delay unit 20 and the tooth portion 43 formed on the cam 40. The rotation fulcrum 21 of the cam 40 is provided at a position apart from the transmission shaft 22 of the delay unit 20. gear
The meshing position of 23 and the tooth portion 43 is between the rotation fulcrum 21 of the cam and the transmission shaft 22 of the delay unit.

As described above, the drive device for the delay switch is
Since the rotation fulcrum 21 of 40 is provided at a position apart from the transmission shaft 22 of the delay unit 20, the size of the delay switch is increased as compared with the case where the rotation fulcrum of the cam is provided on the transmission shaft. Without this, it is possible to increase the contact drive stroke and to use a delay unit having a small suppressing force.

However, the retarding power of the delay unit is still not fully satisfactory. The delay unit having a small suppressing force can be constructed at a lower cost than the delay unit having a large suppressing force. Therefore, it is preferable to use the delay unit having the least restraining force. However, if the suppression force of the delay unit is simply reduced, it becomes difficult to secure the delay time. Therefore, when a delay unit with a small suppressing force is used, it is necessary to secure a delay time by increasing the rotation angle of the cam 40, but if this is done, the coil spring pressure increases, As a result, it is not good because a large force is required to operate the handle 90. Under these circumstances, it has been desired to develop a delay switch driving device that can use a delay unit having a small suppressing force without increasing the handle operating force.

[Object of the Invention]

In view of the above circumstances, it is an object of the present invention to provide a delay switch driving device that can use a delay unit having a small suppressing force without increasing the handle operating force.

[Disclosure of Invention]

In order to achieve the above-mentioned object, the present invention includes a cam that causes the contact mechanism to open / close the contact by a forward / reverse rotation operation and delays the opening / closing operation of the contact with respect to the handle operation during the forward rotation, and a reverse rotation by the handle. A spring that gives the cam an urging force for rotating the cam in the forward direction,
A delay unit for suppressing the rotation speed of the cam,
The rotation fulcrum of the cam is provided at a position distant from the transmission shaft of the delay unit, and the transmission of the restraining force meshes with the gear provided on the transmission shaft of the delay unit and the tooth portion formed on the cam. The delay switch driving device is characterized in that the engagement position is such that the transmission shaft of the delay unit is placed between the engagement position and the rotation fulcrum of the cam. The gist is the switch drive device.

Hereinafter, this will be described in detail with reference to the drawings showing a delay switch including the embodiment.

As shown in FIGS. 1 to 4, a delay unit 20 is provided in the center of a box-shaped switch body (body) 10, and insulating plates 30 and 31 are provided so as to sandwich the upper and lower surfaces thereof. By providing the insulating plates 30 and 31, heat from other parts is cut off, and the delay unit 20 made of thermoplastic resin is used.
Even if heat is applied to the frame body, it will not burn.

The delay unit 20 has a lever 25 extending from the lower surface. The lever 25 is a delay time adjustment lever for adjusting the delay operation time. A small hole 11 is formed in the bottom wall of the switch body 10, and when the delay unit is housed in the switch body, the lever 25 is pushed out of the switch body through this small hole 11, and the lever is pushed from outside the switch body. It can be operated. A packing 12 is sandwiched between the switch body 10 and the delay unit 20 to prevent dust and the like from entering through the gap between the small hole 11 and the lever 25.

On the front surface of the delay unit 20, two cams 40 and 41 are provided on the casing of the delay unit 20 and are pivot points 21 for rotation thereof.
Is attached so as to be eccentric from the transmission shaft 22 of the delay unit. As will be described in detail later, the cams 40 and 41 cause the contact mechanism to open and close the contacts by a forward / reverse rotation operation, and at the time of a forward rotation (rotation in the direction of arrow J in FIG. 1), do not respond to the handle operation. It works to delay the opening and closing of contacts. The delay unit 20 functions to suppress the rotational speed of the cams 40 and 41. The cam 40 closer to the delay unit has an arcuate notch centered on the rotation fulcrum 21.
42 is formed, and a tooth portion 43 is formed on the edge farther from the rotation fulcrum 21 so as to mesh with the gear 23 fixed to the transmission shaft end of the delay unit. The meshing position between the tooth portion 43 and the gear 23 is a position where the transmission shaft 22 of the delay unit is placed between this and the rotation fulcrum 21 of the cam. Tooth 43
When the gear and the gear 23 are meshed with each other, the suppressing force of the delay unit is transmitted, and the cam is slowly rotated. The 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 and the delay unit 20, a coil spring having one end fixed to a protrusion 46 formed on the back surface of the cam 40 and the other end fixed to a protrusion 25 of an extending portion 24 extending upward from the delay unit 20. 50 is installed. The cam 40 is always biased in the forward rotation direction by the coil spring 50. That is, the coil spring 50 applies an urging force for positively rotating the cams 40 and 41 that are rotated in the reverse direction by the handle described later.
41 acts to give. On the other hand, a large cutout 45 is formed in the cam 41 far from the delay unit, and when the cam 41 is rotated like the cam 40, it is interfered by the gear 23 of the delay unit and its cover. It is supposed to never happen. The peripheral edge of the large cutout 45 on the side farther from the rotation 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. cam
Even when the 40 rotates in the forward and reverse directions, the protrusion 44 does not have the bulge 45a.
As long as it moves inside, the cam 41 does not follow the movement of the cam 40. However, when the protrusion 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.

On both sides of the switch body 10, terminal portions are provided, and lock springs 61a, 61b, release buttons 62a, 62b and terminal plates 63a, 63b, 63c constituting the terminal portions are respectively shown in FIG. It is stored at the position indicated by the broken arrow. An electric wire insertion port 15 is provided on the lower wall of the terminal portion of the switch body 10. Terminal board
63a and 63b have separate fixed contacts 64a and 64b, respectively, and form different contact mechanisms within one switch. Terminal board 63
In c, two opposing plates are joined to a plate that connects them at the central portion of both, and both the upper and lower sides are open. When the upper part is opened in this way, the lock spring can be housed after it is housed in the switch body, and the assembly becomes easy. The upper part of the inner plate of the terminal plate 63c is extended toward the center of the switch. A concave portion 66 is formed at its tip. On both sides of the concave portion 66, rising portions 66a (there are two) protruding further than this are provided. Protrusions 67 are formed on both sides of the upper end of the inner plate. The locking springs 61a and 61b are respectively connected to the terminal plate 63.
It is surrounded by a, 63b, 63c and is in contact with the inner plate of each terminal board. A pressing plate 68 is provided above the terminal plate 63c. The holding plate 68 is a recess 12 formed in the switch body 10.
The delay unit 20 direction (in FIG. 3,
Edge 12a of the depression 12 when moved in the direction indicated by arrow A)
The edge is abutted against the edge, and movement in that direction is restricted. The pressing plate 68 is made of an insulating material and covers the upper opening of the terminal plate 63c. Holes 69 in the holding plate 68
Is formed and is engaged with the convex portion 67 of the terminal plate. The convex portion 67 projects from the pressing plate 68. A rectangular cover 80 is covered on the switch body 10, and the pressing plate 68 is pressed against the recess 12 by the pressing force of the cover 80 toward the switch body 10.

The electric wire inserted from the electric wire insertion port 15 on the terminal plate 63c side is sandwiched between the plate outside the terminal plate 63c and the locking spring 61b. The electric wire is pressed and fixed to the outer plate by the elastic force of the locking spring 61b. At this time, the terminal board 63
The reaction force of the elastic force that presses the wire against the plate inside c is applied in the delay unit direction. This reaction force causes the upper part of the terminal plate 63c to expand. However, as described above, the terminal plate 63 is inserted into the hole of the holding plate 68 whose movement toward the delay unit is restricted.
Since the convex portion 67 of c is engaged and the reaction force is finally received by the edge 12a of the switch body 10 via the pressing plate, the upper portion of the terminal plate 63c is prevented from spreading.
Further, since the pressing plate 68 is also fixed in the vertical direction by the pressing force of the cover 80, the locking spring does not float when the electric wire is inserted. One end of a plate-shaped contact spring 70 is joined to the lower part of the terminal plate 63c.
A pusher 71 made of an insulating material is fixed to the central portion of 70, and a movable contact 72 is formed at the lower end of the tip. The 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, as shown in FIG. 3, it usually enters into the notch 47 formed in the cam 41. As will be described in detail later, the pusher 71 includes the cams 40, 4
It moves up and down by the forward and reverse rotation of 1 and the elastic force of the contact spring 70, and the movable contact 72 is attached to and detached from the fixed contact 64a of the terminal plate 63a accordingly. A coil spring 76 is provided between the contact spring 70 and the switch body 10 to increase the contact opening force of the contact spring 70. One end of the coil spring 76 is fitted in the recess 17 formed in the bottom wall of the switch body 10. The contact spring is attached to the other end of the coil spring.
A part 71a of the pusher 71 protruding from the lower surface of the 70 is fitted. In this way, the coil spring 76 is prevented from shifting from its position. The rising portions 66a (there are two) on the side of the convex portion 66 are notches 73a of the rocking body 73.
Engage with (there are two). The oscillating body 73 is a convex portion
Swing with 66 as the fulcrum. Along with this, the movable contact 74 formed on the lower surface of the tip of the oscillator and the fixed contact 64b of the terminal plate 63b are attached and detached. Rise 66a and cutout 7
The engagement of 3a prevents the rocking body 73 from shifting. The rising portion 66a also has a function of preventing the coil springs 96a and 96b, which will be described later, from being displaced in both directions of the rocking body.

The cover 80 and the switch body 10 are assembled by an assembly frame 81. On the front and rear inner surfaces of the cover 80,
A recess 82 is formed. A window 91 is formed in the handle 90, and a transparent lid 92 that closes the window 91 is attached. And the transparent card cover 93 sandwiches the card 94 and handles it.
It is fitted in 90. The handle 90 is housed in a cover 80, and the recess 82 engages with a vertically long protrusion 95 formed on the front and rear surfaces of the handle to serve as a swinging fulcrum of the handle 90. Coil springs 96a and 96b are fitted on the lower surface of the handle and received by the spring support portion 75 of the rocking body 73. The oscillating body 73 is inclined by the action of the coil springs 96a and 96b in the direction opposite to the inclination direction of the handle. At the end of the handle swing, the coil springs 96a and 96b are bent into a dogleg shape or an inverted dogleg shape,
The handle 90 is securely fixed at that position by the restoring force of the a and 96b to return to the straight state. In other words, the handle of this switch is a tumbler button.

The neon lamp 97 is connected to the terminal plates 63a and 63c, respectively. On the terminal plate 63c side, the lead wire of the neon lamp 97 can be wound around the convex portion 67 of the terminal plate 63c, which facilitates connection by soldering. When the neon lamp 97 is turned on, the light leaks out through the transparent lid 92, so that the position of the switch can be easily confirmed even in the dark. The entire switch is sized to be housed in the module for one large prism.

FIG. 3 shows the off state of this switch, and from this state, the right side of the handle 90 is pushed and the handle is tilted in the opposite direction. Then, the oscillating body 73 is tilted in the opposite direction, and the movable contact 74 formed on the oscillating body becomes the fixed contact 6 on the terminal plate 63b.
This circuit is turned on by contacting 4b. At the same time, the convex portion 90a formed on the lower portion of the handle is used to project the convex portion 40a on the cam 40.
Is pressed to forcibly rotate the cam 40 around the rotation fulcrum 21.
After a certain stroke, the protrusion 44 of the cam 40 abuts against the bulging portion one end 46a of the cam 41, and the cam 41 is moved together.

In the peripheral portion 40b of the cam 40 with which the pressing element 71 of the contact spring contacts, the distance between the contact point of the pressing element 71 and the rotation fulcrum 21 is such that the handle 90 forces the cam 40 to rotate against the biasing force of the coil spring 50. When the cam 44 is moved (reversely rotated), the protrusion 44 has one end 46 of the bulging portion of the cam 41.
It is inclined so that it gradually increases until it abuts the other end 46a away from b. Therefore, the pusher 71 is
With the reverse rotation of 40, it is pushed down. And cam
When the projection 44 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. At this time, the inclined peripheral edge of the cam 40 is formed. Since the pusher 71 is sufficiently lowered by 40b, the pusher 71
Can go over a step between the peripheral edge 41a of the cam 41 and the notch 47 and move to a position in contact with the peripheral edge 41a. When the pusher 71 is pushed down by the cams 40 and 41 in this way, the movable contact 72 of the contact spring comes into contact with the fixed contact 64a of the terminal plate 63a, and the electric path 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 shown in FIG. 5, the handle 90 moves to the 3rd position.
As shown in the figure, the movable contact 74 is separated from the fixed contact 64b, and the electric path is turned off. At the same time, the convex portion 90a of the handle is released from the convex portion 40a of the cam 40, so that the restoring force of the coil spring 50 causes the cam 40 to rotate forward to return to the state shown in FIG. At this time, the delay unit
The rotation speed is suppressed by the action of 20, and the cam 40 slowly rotates forward. When the pusher 71 comes to the position of the peripheral edge 40b of the cam 40 as the cam 40 rotates normally, the pusher 71 separates 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 is fixed to the end 46 of the bulge of the cam 41.
When it comes into contact with b, the cam 41 comes to be moved together with the cam 40. At this time, the cam 41 has a notch 47
Since this portion is formed, when this portion comes to the position of the pusher 71, the pusher 71 suddenly loses its support and enters the notch 47 by the restoring force of the contact spring 70 and the coil spring 76. Then, the movable contact 72 is quickly separated from the fixed contact 64a, and the electric path is turned off. This quick opening operation of the movable contact 72 improves the arc breakage.

As described above, the delay switch driving device includes the gear 23 and the cam provided on the transmission shaft 22 of the delay unit.
It is characterized in that the meshing position with the tooth portion 43 formed on the 40 is the position where the transmission shaft 22 is placed between this and the rotation fulcrum 21 of the cam. Comparing this with the conventional delay switch drive device shown in FIG. 6, the delay switch drive device according to the present invention has a longer distance between the meshing position and the cam rotation fulcrum. There is. Therefore, even if the rotation angle of the cam is the same as the conventional one, it is possible to use a delay unit having a smaller suppressing force than the conventional one. That is, it is possible to use the delay unit having a small restraining force without increasing the handle operating force. Further, when the delay unit having the same restraining force as the conventional one is used, the rotation angle of the cam can be reduced, and the steering wheel can be operated with a small force.

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.

For example, this switch is used as a switch for a toilet or the like, and 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. This way,
During use, the lighting is turned on and the ventilation fan is turned on.When the lighting is turned off after use, the ventilation fan will stop after a predetermined time, so the inconvenience caused when the ventilation fan is stopped immediately is avoided. In addition, it is possible to obtain the effect of preventing the forgetting to turn off the ventilation fan. This switch
It can be used in various places other than the toilet. The delay time may be set according to the purpose of use, but may have a structure that cannot be adjusted.

In the delay unit used in the present invention, different poles of a magnet are opposed to each other and a conductor plate such as a copper plate is placed therebetween, and the eddy current generated in the conductor plate is used to delay (delay) the positive rotation of the cam. ) 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〕

In the delay switch drive device according to the present invention, as described above, the meshing position between the gear provided on the transmission shaft of the delay unit and the cam-formed tooth portion is between this and the rotation fulcrum of the cam. Since the transmission shaft is placed at the position, the delay unit having a small restraining force can be used without increasing the handle operating force, and thus the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a delay switch having an embodiment of a delay switch driving device according to the present invention, FIG. 2 is a plan view showing the internal structure of the delay switch in an assembled state, and FIG. FIG. 4 is a cross-sectional view of the delay switch seen from the front, FIG. 4 is a cross-sectional view of the delay switch seen from the side, and FIG. 5 is a cross-section seen from the front showing the state after the handle is tilted in the opposite direction from the state of FIG. FIG. 6 and FIG. 6 are sectional views showing a delay switch equipped with a conventional drive device for a delay switch, as viewed from the front. 20 ... Delay unit, 21 ... Cam rotation fulcrum, 22 ... Transmission shaft,
23 ... Gear, 40, 41 ... Cam, 43 ... Tooth, 50 ... Coil spring, 64a ... Fixed contact, 72 ... Moving contact, 90 ... Handle

Claims (1)

[Claims] 1. A cam that rotates the contact opening and closing the contact mechanism by a forward and reverse rotation operation and delays the opening and closing operation of the contact with respect to the handle operation during the forward rotation, and a cam that is reversely rotated by the handle. The cam is provided with a spring that applies a biasing force for moving the cam, and a delay unit that suppresses the rotation speed of the cam, and the rotation fulcrum of the cam is provided at a position apart from the transmission shaft of the delay unit. In the delay switch driving device, the transmission of the suppressing force is performed by meshing a gear provided on the transmission shaft of the delay unit and a tooth portion formed on the cam, and the meshing position is the same. A drive device for a delay switch, characterized in that the transmission shaft of the delay unit is placed between the rotation fulcrum of the cam and the cam.