JP2514192B2 - Canopy switch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a canopy switch.

[Background technology]

The canopy switch is designed so that every time the operation string pulled out from the switch body is pulled, the operation piece at the tip of the operation string rotates the cam provided inside the switch body in one direction, for example, by 90 °. By this rotation, the cam operates the contact spring, and the movable contact of the contact repeatedly contacts and separates from the fixed contact facing the contact spring, so that the circuit can be opened or closed. It has become. When the pulling force of the operating string is released, the operating piece returns to its original operating position by the spring force stored in the coil spring wound around the rotating shaft of the cam.

In the conventional canopy switch, the switch body is composed of a body and a lid that covers this body, and each component is assembled and completed as follows.

A first terminal plate having a fixed contact, a second terminal plate having a contact spring, and a cam are incorporated into the body at predetermined positions.

 The shaft is inserted through a shaft hole formed in the center of the cam.

 The operation piece is inserted into the shaft from above the cam.

A coil spring is inserted into the shaft from above the operation piece.
Note that the spring extends beyond the shaft when no load is applied.

The end of the coil spring on the upper side (lid side) is hooked on the hooking portion formed on the inner wall surface of the lid.

The coil spring is set in a predetermined position on the body and screwed while rotating the lid so that the coil spring has a spring force for rotating the operating piece in the direction opposite to the rotating direction of the cam.

With such a configuration, there is a problem in assembling, such as it is difficult to properly adjust the spring force of the coil spring.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide a canopy switch that can be easily assembled.

[Disclosure of Invention]

In order to achieve such an object, the present invention comprises a first terminal plate having a fixed contact and a second terminal plate provided with a contact spring having a movable contact facing the fixed contact. The contact spring is configured such that a cam rotatably supported by a shaft slides an operating surface of the cam to operate the cam so as to bring the both contacts into and out of contact with each other. When an operation piece having an operation string is rotatably mounted and a coil spring is wound, and when the string is pulled, the cam is rotated in one direction by following the operation piece. At the same time, by rotating the operating piece in the one direction, a spring force is stored in the coil spring, and the stored operating force causes the operating piece to rotate in the opposite direction. Is equipped with reverse rotation prevention means, and the reverse In the canopy switch, wherein the prevention means prevents the cam from being driven by the operation piece rotating in the opposite direction, one end of the shaft is fixed to one of the terminal plates, and the coil spring, The operation piece and the cam are inserted through the shaft, and have a retaining means for preventing the coil spring, the operation piece, and the cam from coming off the shaft, and the coil spring, the operation piece, the cam, and the terminal plate are integrally formed. The gist is a canopy switch that includes a terminal block assembled to the above and a switch body that accommodates the terminal block.

The present invention will be described in detail below with reference to the drawings showing an embodiment thereof.

As shown in FIGS. 3 to 7, in this canopy switch, the switch body 1 is composed of a body 11 and a lid 12. The body 11 and the lid 12 are formed by dividing in a direction orthogonal to the axis housed in the switch body.
A groove 11a into which the first terminal plate 3 is fitted and a groove 11b into which the second terminal plate 2 is fitted are formed on the inner wall surfaces of the body 11 which face each other. U-shaped notches 13a and 13b are formed in the wall provided with the grooves 11a and 11b so that the terminal screws 25 and 35 of the terminal plates 2 and 3 are exposed to the outside of the body. On the bottom surface 14,
A cam receiver 15 is formed in a shape in which saw teeth are annularly arranged. The first terminal plate 3 is provided with a bent piece 31 having a fixed contact 32, and the bent piece 31 is placed on the bottom surface 14 side of the body.
It is supposed to be housed in 11. In the second terminal board 2,
A contact spring 21 is attached. The contact spring 21 is the second
It is composed of a fixed portion 21a for the terminal plate 2 and a spring portion 21b formed by bending the fixed portion 21a at a right angle.
The fixing portion 21a is fixed to the second terminal plate 2 by the terminal screw 25, and the spring portion 21b is formed in the second terminal plate 2 by the cut 2a.
Is to be inserted into. The spring portion 21b has a second
The movable contact 22 is provided at a position facing the fixed contact 32 of the first terminal plate 3 when the terminal plate 2 is fitted in the groove 11b. A bearing portion 23 extends from the upper edge of the second terminal plate 2. A shaft hole 25 is formed at the tip of the bearing 23, and one end of a shaft 27 is inserted into the shaft hole 25 and fixed by caulking. A coil spring 5, an operating piece 6 and a cam 4 are inserted into the shaft 27 and integrated with the second terminal plate 2 (blocked with the second terminal plate 2), as shown in FIGS. 1 and 2. The terminal block A is formed. axis
One end 51 of the coil spring 5 wound around the 27 is the bearing portion 23.
It is adapted to be hooked on a hooking portion 24 formed at the tip of. The operation piece 6 has a shaft hole formed in the center,
A protruding piece 61 is provided on a part of the peripheral edge. A rising piece 62 to which one end of the operation string 7 is attached is formed on the protruding piece 61. The rising piece 62 includes the other end of the coil spring 5.
52 is designed to be hooked. The cam 4 has a shaft hole 49 in the center, one end is a flange-shaped large-diameter portion 4a, and the other end is a small-diameter portion 40. At the center of the end surface of the large diameter portion 4a,
A concave portion into which the operation piece 6 is fitted is formed, and an upright portion 44 and a tapered portion 45 are provided on the peripheral edge of the concave portion 4 respectively.
Two teeth are continuously formed. The side peripheral surface of the small diameter portion 40 is in sliding contact with the spring portion 21b of the contact spring 21. On this side circumferential surface, convex portions 41 are formed at positions facing each other with the shaft hole 49 interposed therebetween. When the cam 4 rotates and the convex portion 41 hits the spring portion 21b, the pressing force causes the spring portion 21b to bend in the direction away from the shaft 7, and the movable contact 22 separates from the fixed contact 23 to open the circuit. When a portion of the peripheral surface of the small diameter portion other than the convex portion 41 is in sliding contact with the spring portion 21b, the movable contact 22 and the fixed contact 23 are in contact with each other to close the circuit. It should be noted that both contact points may be in contact with each other when the convex portion 41 comes into contact with the spring portion 21b. In this way, the side peripheral surface of the small diameter portion 40 is the operating surface of the spring portion 21b. On the end surface of the small diameter portion 40, four teeth including an upright portion 42 and a tapered portion 43 are continuously formed around the shaft hole 49. The inclination direction of the tapered portion 43 is
The taper portion 45 of the large diameter portion 4a is in the opposite direction. The end surface of the small diameter portion 40 is supported by the cam spring 5 by the biasing force of the coil spring 5.
It is designed to come into contact with the tooth flanks of 15. That is, as shown in FIG. 3B, the cam receiver 15 has four teeth having the same diameter as the small diameter portion 40 and the tapered portion 15b oriented in the same direction as the small diameter portion 40. The cam 4 is pressed toward the cam receiver 15 by the urging force of the coil spring 5, and the teeth of the small diameter portion 40 mesh with the teeth of the cam receiver 15 every 90 ° rotation, so that the cam 4 rotates clockwise. Although they rotate, the upright portions 42 and 15a of their teeth abut against each other counterclockwise so that they do not rotate. In this way, the teeth of the small diameter portion 40 and the teeth of the cam receiver 15 serve as a reverse rotation preventing means. On the other hand,
The end surface 4b of the large diameter portion 4a on the small diameter portion 40 side is the upper end edge 21c of the spring portion 21b.
Therefore, the coil spring 5, the operation piece 6 and the cam 4 are prevented from coming off the shaft 27. That is, the upper end edge 21c of the spring portion 21b is a retaining member. Therefore, this canopy switch
The assembly of the switch portion can be easily completed only by assembling the first terminal plate 3 and the block A in a predetermined place of the body 11. Further, the body 11 is formed so that when the block A is assembled, the bearing portion 23 and the hooking portion 24 formed at the tip thereof protrude from the joint surface 11c with the lid 12. Therefore, the one end portion 51 for storing the biasing force in the coil spring 5 is easily locked, and the coil spring 5
If the spring force in the direction of is weak, block A
The spring force can be easily adjusted by rotating the one end portion 51 of the coil spring 5 in the state of being assembled in. After the switch portion is assembled in this manner, the cylindrical member 9 having the screw 93 formed on the outer peripheral surface thereof and the passage 9a of the operation string 7 formed at the center is mounted on the body 11. Next, the cover body 12 is covered and fixed to the body 11 with screws 17, so that the switch body 1 is completed. Needless to say, the open end of the operation string 7 must be pulled out from the passage 9a before the lid 12 is closed. Although not shown, the inner wall surface of the lid 12 is formed with a recess into which the bearing portion 23 and the hook portion 24 are fitted, and one end 51 of the coil spring 5 hooked on the hook portion 24 is in use. It does not come off.

This canopy switch has a terminal cover 8 for covering the terminal screws 25 and 35 after connection. The terminal cover 8 is formed so as to substantially cover the switch body 1 except for the upper surface of the lid 12, and a substantially U-shaped notch 81 into which the cylindrical member 9 is fitted is formed on one side surface thereof. This notch
Protrusions 82, 82 are formed in the vicinity of the middle portion of the inner peripheral edge of 81 so as to protrude from both sides, and the width is narrow. The width of the narrowed portion is slightly smaller than the outer diameter of the cylindrical member 9. Therefore, the terminal cover 8 is the switch body 1
The projections 82 and 82 bite into the cylindrical member 9 when it is covered with the switch body 1, and the switch body 1 is in a state where it is temporarily fixed.
The canopy switch thus assembled and wired is fixed to the instrument as follows, for example. That is, the switch body 1 is arranged, for example, in a body of a lighting fixture or the like, and after the washer 92 is inserted into the cylindrical member 9, the end of the cylindrical member 9 is removed from the hole formed in the body of the fixture. Project the part out of the body. Once again, another washer 92 is inserted into the cylindrical member 9 and the fixing nut 91 is screwed into the cylindrical member 9 and tightened, and the nut 91 and the switch body 1 are inserted through the two washers 92, 92 and the body of the device. The side wall of the terminal cover is sandwiched between and fixed. If the terminal cover 8 is not temporarily fixed, the terminal cover 8 must be supported until the nut 91 is tightened and the switch body 1 is completely fixed. In the case of this canopy switch, There is no need for this, and the installation work is easy. In FIG. 3 (a), reference numeral 12a is a concave portion that serves as a wiring passage when the terminal cover 8 is covered, and 82 is a notch that serves as a wiring outlet.

The operation of this canopy switch will be described below. That is, when the operation string 7 is pulled, the operation piece 6 rotates clockwise. Cam 4
When the operation piece 6 rotates clockwise, the protruding piece 61 of the operation piece 6
Is engaged with the upright portion 44 of one of the four teeth formed on the large-diameter portion 4a of the cam 4, so that it is driven and rotated by the operation piece 6. At this time, the coil spring 5 has its end portion 52 at the rising portion 62 of the operation piece 6.
Since it is hooked on, the spring force for rotating the operation piece 6 in the opposite direction (counterclockwise) is stored. Therefore, when the tow of the operation string 7 is released, the operation piece 6 returns to the original position before the tow. On the other hand, as described above, since the cam 4 is rotated by 90 °, the teeth of the small diameter portion 40 and the cam receiver 15 mesh with each other so that they cannot rotate counterclockwise. If the operation piece 6 is rotated by 90 ° or more, even if the pulling is released, it does not rotate counterclockwise following the operation piece. In other words, each time the operating cord 7 is pulled, the cam 4 rotates 90 ° clockwise. Since the operation piece 6 is always returned to the original position by the spring force as described above, this operation can be always performed. Since the cam 4 is rotated by 90 ° in this way, one of the two towings is formed in the small diameter portion 40 of the cam 4 as shown in FIG. 8 (a). The convex portion 41 is the spring portion 21.
The circuit can be opened by pressing a to disengage the movable contact 22 from the fixed contact 32 or by releasing the pressing as shown in FIG. 8B.

The canopy switch according to the present invention is not limited to the above embodiment. For example, in the embodiment, only four teeth are formed, but the number of teeth may be six and the cam may be rotated by 60 ° with one pull. In the example,
Although only the middle part of the U-shaped notch of the terminal cover is narrowed, the width of the whole may be narrowed. Although the bearing portion is formed on the second terminal plate in the embodiment, it may be formed on the first terminal plate. In the embodiment, the contact spring 21 is used to prevent disengagement, but the cam may be provided at the cam-side end of the shaft.

〔The invention's effect〕

Since the canopy switch according to the present invention is configured as described above, the assembling work can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a blocked switch portion of a canopy switch according to the present invention, FIG. 2 is a side view thereof, FIG. 3 (a) is an exploded perspective view of the entire canopy switch, and FIG. 3 (b). ) Is a partial perspective view for explaining the cam receiver, FIG. 4 is a plan view showing a state where the lid of the switch body is removed, and FIG. 5 is a front view for explaining the mounting state thereof.
FIG. 6 is an exploded perspective view illustrating a state where the terminal cover is removed, FIG. 7 is a front view illustrating a state where the terminal cover is attached to the switch body, and FIGS. 8A and 8B are cams and contacts. FIG. 7 is a schematic diagram illustrating the operation of FIG. A ... Block, 1 ... Switch body, 2 ... Second terminal plate, 3 ... First terminal plate, 4 ... Cam, 5 ... Coil spring, 6 ... Operating piece, 7 ... Operating string, 8 …… Terminal cover, 11 …… Body, 12 …… Lid, 21 …… Contact spring, 22 ……
Movable contact, 23 …… Bearing part, 24 …… Hooking part, 25,35 …… Terminal screw, 27 …… Shaft, 32 …… Fixed contact, 81 …… Notch

Claims (4)

(57) [Claims] 1. A first terminal plate having a fixed contact, and a second terminal plate provided with a contact spring having a movable contact facing the fixed contact, wherein the contact spring is rotated by a shaft. A movably supported cam slides its operating surface against it and operates it to bring the two contacts into and out of contact with each other, and an operating piece having an operating string is rotated on the shaft. When the strap is pulled, the cam is rotated in one direction by being driven by the operation piece, and at the same time, the operation piece is moved in the one direction. The spring force is stored in the coil spring by the rotation to, and the operation piece is rotated in the opposite direction by the stored spring force, but the cam is provided with the reverse rotation preventing means. This reverse rotation prevention means is in the opposite direction of the operation piece. In canopy switch adapted to prevent the driven of the cam due to rotation, one end of the shaft is fixed the either one of the terminal plate,
The coil spring, the operation piece and the cam are inserted into the shaft, and the coil spring, the operation piece and the cam have retaining means for preventing the coil spring from coming out of the shaft.
A canopy switch comprising: a terminal block in which an operation piece, a cam, and the terminal plate are integrally assembled; and a switch body that houses the terminal block. 2. A retaining portion is provided on the second terminal plate and a flange portion provided on a peripheral edge of the cam inserted into the shaft fixed to the second terminal plate, and the shaft is provided on the shaft. The canopy switch according to claim 1, further comprising: the contact spring arranged so as to come into contact with the end surface of the flange portion from the open end side of the canopy switch. 3. A switch main body includes a body and a lid formed by dividing the switch main body in a direction orthogonal to an axis housed in the switch main body, and a position protruding from the body on the second terminal plate. The canopy switch according to claim 2, wherein a hooking portion for hooking one end of the coil spring is formed on the canopy switch. 4. A terminal body exposed from the switch body, wherein the switch body has a cylindrical portion in which a passage for an operating string is formed and which projects from a side portion of the switch body, and a screw is formed on an outer peripheral surface of the cylindrical portion. The terminal cover that covers the portion has a notch formed in its side portion into which the cylindrical portion fits, the middle portion of the notch is narrow, and when the switch body is covered with the notch, A temporary fit is made by sandwiching the outer peripheral surface of the cylindrical portion, and is clamped and fixed between the switch body and the fixing metal fitting that is screwed into the screw of the cylindrical portion. The canopy switch according to any one of claims 1 to 3.