JPH0664970B2 - 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 delay switch that is turned on or off after being turned on.

[Background technology]

A conventional delay switch uses a combination of an oil dashpot and a magnet to take a delay time. 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, the delay time changes depending on the mounting direction, etc. There was a drawback. In addition, due to the structure, the module cannot be made smaller than the module for two large prisms.

Therefore, in order to solve such a problem, the inventor has conducted a joint research by a delay unit at the center of a box-shaped switch body, terminals on both sides of the delay unit, an upper handle, and a lower portion between the terminals. Each of the contact mechanisms for opening and closing is provided with a cam on the front surface of the delay unit, and the cam is always biased in the forward rotation direction by the spring and forcedly rotated in the reverse direction by the handle. A delay switch has been developed which, when actuated, rotates slowly by the action of the delay unit and operates the contact mechanism after a predetermined time.

However, in the delay switch, the pressing force of the cam is not always constant because the contact spring moves to a predetermined position to obtain the contact pressure by the pressing element of the contact mechanism pressed by the cam. That is, since the position or size of the cam or the delay unit subtly affects the pressing force, there is a problem that the pressing force varies and stable conduction cannot be obtained.

[Object of the Invention]

In view of the above points, according to the present invention, a predetermined delay time can be secured even if the on / off operation is arbitrarily repeated, the mounting direction is not limited, and the size of the entire switch can be reduced. An object of the present invention is to provide a delay switch that can maintain a stable contact pressure at the contact portion.

[Disclosure of Invention]

In order to achieve the above object, the present invention provides a delay unit in the center of a box-shaped switch body, terminal portions on both sides of the delay unit, a handle on the upper side, and a contact mechanism for opening and closing the terminals on the lower side, respectively. A first cam is provided on the front surface of the delay unit, and the cam is always biased in the forward rotation direction by a spring and is forcedly rotated in the reverse direction by the handle, A delay switch that rotates slowly by the action of the delay unit and operates the contact mechanism after a predetermined time, wherein the contact mechanism is such that the contact spring pressure always acts in a direction to close the contact. However, the contact is normally opened by the action of the second cam having an urging force that overcomes the spring pressure, and the first cam resists the urging force of the second cam. Pressing When the, the gist of the delay switch, characterized in that the contact by the contact spring pressure is adapted to be closed.

Hereinafter, this will be described in detail with reference to the drawings showing an embodiment thereof.

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 adjusting lever for adjusting the delay 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 a gap between the small hole 11 and the lever 25.

On the front surface of the delay unit 20, two first cams 40 and 41 are provided.
However, the fulcrum 21 of the rotation provided on the casing of the delay unit 20 is attached so as to be eccentric from the transmission shaft 22 of the delay unit. The cam 40 closer to the delay unit is formed with an arcuate notch 42 centered on the fulcrum 21, and a tooth portion 43 is formed at the edge near the fulcrum 21. It is adapted to mesh with the gear 23 fixed to. 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, one end is fixed to the projection 46 formed on the back surface of the cam 40, and the other end is fixed to the projection 25 of the extension portion 44 extending upward from the delay unit 20. Is attached. The cam 40 is always biased by the coil spring 50 in the forward rotation direction (the arrow direction in FIG. 1). 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 interferes with the gear 23 of the delay unit and its cover. It is supposed to never happen.
The peripheral edge of the large notch 45 farther from the fulcrum 21 bulges in an arc shape, and the protrusion 4 formed on the front surface of the cam 40 at the bulging portion 45a.
4 is in. 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 inside the bulging portion 45a. 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 plates that face each other are joined to a plate that connects the two plates at the central portion of the two plates. The terminal board 63c is open at both the top and bottom. In the case of the terminal plate whose upper part is blocked, the locking spring cannot be stored after the terminal plate is stored in the switch body, so the locking spring was stored first. However, in this case, the locking spring may fall into the recess in the center of the switch body. Therefore, the lock spring and the terminal plate must be housed at the same time, which is very difficult to assemble. When the upper part is opened like the terminal plate 63c, the locking spring can be housed after the terminal plate is housed in the switch body, and the assembling becomes easy. The upper part of the inner plate of the terminal plate 63c is extended toward the center of the switch. Convex portion 66 at its tip
Are formed. On both sides of the convex portion 66, rising portions 66a (there are two) projecting 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 plates 63a, 63b and 6
It is surrounded by 3c and contacts the inner plate of each terminal board. Terminal board
A pressing plate 68 is provided above 63c. Holding plate 6
8 is fitted in a recess 12 formed in the switch body 10, and when moved in the direction of the delay unit 20 (indicated by an arrow A in FIG. 3), the edge 12a of the recess 12 has an edge. It abuts and the 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. A hole 69 is formed in the pressing plate 68 and is engaged with the convex portion 67 of the terminal plate. The convex portion 67 projects from the pressing plate 68. A square cover 80 is covered on the switch body 10, and the pressing plate 68 is depressed by the pressing force of the cover 80 toward the switch body 10.
It is pressed to 12.

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 terminal 63c can be prevented from spreading. Also,
In this embodiment, since the pressing plate 68 is also fixed in the vertical direction by the pressing force of the cover 80, it is possible to prevent the locking spring from floating 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, and a second cam 71 having a presser made of an insulating material is inserted in the central part of the contact spring 70 and attached to the lower part of the tip. A movable contact 72 is formed. The other end of the second cam 71 is fitted in the recess 10a of the switch body 10, and the upper piece thereof contacts the contact spring 70 while pushing the contact spring 70 upward. Therefore, the movable contact 72 and the fixed setting 64a are separated from each other by having an urging force against the contact spring pressure acting in the direction of closing the contact. Further, a part 71a of the pusher provided on the second cam 71 is
Since one end of the coil spring 76 is fitted, it acts on the strong spring pressure of the coil spring 76, and the pressing element is always strongly urged in the direction of contacting the peripheral edges of the cams 40 and 41, so that the movable contact 72 and the fixed contact 64a are It is normally in a separated state. Normally, the pusher provided on the cam 71 is inserted into the notch 47 formed on the cam 41 as shown in FIG. As will be described later in detail, the pusher provided at one end of the cam 71 moves up and down by the forward and reverse rotations of the first cams 40 and 41 and the elastic force of the contact spring 70, and accordingly, the movable contact 72. Is attached to and detached from the fixed contact 64a of the terminal board 63a. A coil spring 76 is provided between the contact spring 70 and the switch body 10 in order 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. At the other end of the coil spring, a part 71a of a pusher 71 protruding from the lower surface of the contact spring 70 is fitted. In this way, the coil spring 96 is prevented from shifting from its position. The rising portions 66a (there are two) on the side of the convex portion 66 are engaged with the notches 73a (there are two) of the oscillating body 73. The oscillating body 73 oscillates with the convex portion 66 as a fulcrum. Along with this, the movable contact formed on the lower surface of the tip of the oscillator.
The 74 and the fixed contact 64b of the terminal board 63b are adapted to be attached and detached. By engaging the rising portion 66a and the notch 73a, the rocking body 73 is prevented from shifting. Rising part
The 66a also has a function of preventing the coil springs 96a and 96b, which will be described later, from being displaced toward both sides of the rocking body.

The cover 80 and the switch body 10 are assembled by an assembly frame 81. A recess 82 is formed on the front and rear inner side surfaces of the cover 80. 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 into the handle 90 with the card 94 sandwiched therebetween. 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, 96b on the bottom of the handle
Is fitted 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. Coil springs 96a, 96b at the end of the handle swing
Is bent in a dogleg shape or an inverted dogleg shape, and the handle 90 is securely fixed at that position by the restoring force of the coil springs 96a 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, 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 pushes the convex portion 40a on the upper portion of the cam 40 to forcibly rotate the cam 40 around the fulcrum 21. After a certain stroke, the protrusion 44 of the cam 40 is fixed to the bulge end 46 of the cam 41.
The cam 41 is moved together with the a.

In the peripheral portion 40b of the cam 40 with which the pressing element 71 of the contact spring is in contact, the distance between the contact point of the pressing element 71 and the rotation fulcrum 21 is such that the cam 40 is forced to rotate against the urging force of the coil spring 50 (reverse direction). The protrusion 44 is rotated away from the bulging portion one end 46b of the cam 41 and is separated from the other end 46a.
It is inclined to gradually increase until it hits. Therefore, the pusher provided at one end of the cam 71 is
The cam 40 is pushed down with the reverse rotation. And
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. Edge 40
Since the pusher at one end of the cam 71 has been sufficiently lowered by b, this pusher has a peripheral edge 41a of the cam 41 and the notch 4
It is possible to move over to the position in contact with this peripheral edge 41a by overcoming the step between the edge and the edge. When the pusher is pushed down by the cams 40 and 41 in this way, the contact 72 of the contact spring comes into contact with the 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.
In the state shown in the figure, the protrusion 90a of the handle is released from the protrusion 40a of the cam 40, and 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 speed of the cam 40 is controlled by the operation of the delay unit 20, and the cam 40 slowly rotates forward. When the pusher 41 comes to the position of the peripheral edge 40b of the cam 40 as the cam 40 rotates normally, the pusher at one end of the cam 71 separates from the peripheral edge of the cam 40,
It 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 is moved together with the cam 49. At this time, since the notch 47 is formed in the cam 41, when this portion comes to the position of the pusher at one end of the cam 71, the pusher suddenly loses its support, and the contact spring 70 and the tension spring 76 are The notch 47 enters due to the restoring force of. Then, the contact 72 is quickly separated from the contact 64a, and this electric path is turned off. This quick opening action of 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. Further, although the holding plate is provided only on the terminal plate 63c side, if the holding plate is also provided on the terminal plates 63a and 63b side, the above-described effects can be obtained also on these terminal plates.

This switch is used, for example, as a switch such as a toy so that the terminal on the oscillator 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 eliminate the inconvenience that sometimes occurs and to prevent the forgetting to turn off the ventilation fan. The switch can also 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, the different poles of the magnet are also 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.

Further, instead of the coil spring 76 for pushing up the pusher provided on the cam 71, a leaf spring integral with the contact spring 70 may be used.

〔The invention's effect〕

Since the delay switch according to the present invention has the structure as described above, the predetermined delay time can be secured even if the ON / OFF operation is arbitrarily repeated, there is no limitation in the mounting direction, and the entire switch is The size of the contact can be reduced, and a stable contact pressure determined only by the contact spring pressure can be maintained at the contact portion.

[Brief description of drawings]

1 is an exploded perspective view showing an embodiment of a delay switch according to the present invention, 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. 5 is a front sectional view showing a state after the handle is tilted in the opposite direction from the state shown in FIG. 10 …… Switch body, 10a …… Concave part (a part of switch body), 20 …… Delay unit, 40,41 …… First cam, 50
...... Coil springs, 63a, 63b, 63c ...... Terminal plates, 64a, 6
4b …… fixed contact, 67 …… convex, 68 …… pressing plate, 69 ……
Hole, 70 ... Contact spring, 71 ... Second with pusher at one end
Cams, 72,74 ... movable contacts, 73 ... rocker, 76 ... coil springs, 80 ... cover, 90 ... handle

Claims (2)

[Claims] 1. A delay unit in the center of a box-shaped switch body,
A terminal portion is provided on both sides of the delay unit, a handle is provided above the delay unit, and a contact mechanism for opening and closing the terminals is provided below, and a first cam is provided on the front surface of the delay unit. The cam is always biased in the forward rotation direction by the spring, and when forcedly rotated in the reverse direction by the handle, the cam is slowly rotated by the action of the delay unit and operates the contact mechanism after a predetermined time. In the delay switch, the contact mechanism is such that the contact spring pressure always works in the direction of closing the contact, but by the action of the second cam having a biasing force that overcomes this spring pressure. , The contact is normally opened, and the contact is closed by the contact spring pressure when the first cam presses the second cam against its urging force. When Delay switch that. 2. The delay switch according to claim 1, wherein one end of the second cam is fitted to a part of the switch main body so as to be fitted on the shaft.