JP2000306467A - Pull switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize contact by applying a load only in the contact direction of a contact applying no force of a return spring to a driving handle at a steady state. SOLUTION: A driving handle 4 to bring a movable contact into contact with and detach it from a fixed contact provided in a body 1 and a switch mechanism part 10 having a return spring 5 to return the driving handle 4 to a designated position are provided on the insulating body 1. The switch mechanism part is driven to break the contact by pulling an operating pull mounted to the driving handle 4 extended outside the body 1, and the energizing side part 5a of the return spring 5 is made to abut on the stopper part 18 of the driving handle 4 at a steady state so as not to apply the load of the return spring 5 to the driving handle 4. Thereby, a contact pressure of the movable contact applied onto the fixed contact is not reduced by a pressure contact of the driving handle 4 applied onto the stopper part 18, and they can be stably brought into contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pull switch mainly used for lighting equipment and the like.

[0002]

2. Description of the Related Art As a conventional pull switch, FIG. 7 is an exploded perspective view in a case where a gear is a movable contact, and FIG. 8 is an exploded perspective view in a case where a drive handle is a movable contact. 7 and 8, 50 is a body, 51 is a fixed contact, 52 is a pulling operation tool outlet, 53 steps, 54 is a movable contact, 55 is a drive handle, 56 is a pulling operation tool, 57 is a coil spring, 58 Is a mandrel. By operating the pull operation tool 56 attached to one end of the drive handle 55, the drive handle 5
In the pull switch in which the mode of the connected load is switched by rotating the gear 53 while the gear 5 rotates and reciprocates, the contact load between the movable contact 54 and the fixed contact 51 is determined by the spring pressing the drive handle 55 toward the fixed contact. Given by power. In a steady state where no pulling operation is performed, the drive handle 55 is held at the top dead center by the coil spring 57. As shown in FIG. 9, the rotation of the drive handle 55 at the top dead center (giving the initial position) is performed in the vicinity of the attachment portion of the pull operation tool 56 of the drive handle 55 to the body 50 facing the pull operation tool outlet 52. The ribs or walls on the inner surface of the housing are in contact with the stopper 60.

[0003]

In the pull switch having the above structure, as shown in FIG. 10, the operation direction of the pulling operation tool 56 is usually the same as the pulling operation tool outlet 52 of the body 50.
However, since the size of the pulling operation tool outlet 52 has a margin as shown in A, when the pulling operation tool 56 is pulled obliquely, the driving handle 55 has a tangent to the rotational operation. Forces other than direction are applied.

In particular, as shown in FIG. 11, the operation direction is the opening side of the body 50 (the direction opposite to the contact surface of the movable contact 54).
In the case of (1), one end of the drive handle 55 to which the pulling operation tool 56 is attached rises and tilts. Drive handle 5
If the abutment 5 contacts the stopper 60 on the inner surface of the body 50 while being inclined, the drive handle 55 may remain inclined due to friction between the drive handle 55 and the stopper 60 due to the force of the coil spring 57. There is.

Further, as shown in FIG.
Even when the handle 6 is not pulled obliquely, the hooking position of the coil spring 57 of the drive handle 55 and the contact position of the stopper portion 60 of the body 50 are shifted with respect to the rotation axis of the drive handle 55. Generates a torque T that tilts the drive handle 55 by the return force F by the coil spring 57. Therefore, when the drive handle 55 is tilted and the drive handle 55 is used as the movable contact 54, the contact does not come into contact and a gap B is formed and the connection is not conducted. Alternatively, even if the contact occurs, the contact load is not sufficiently transmitted, and the contact becomes unstable. Further, even when the gear 53 is set to the movable setting 54, an extra load from the drive handle 55 may be applied, and the contact of the contact may become unstable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pull switch in which a force of a return spring is not applied to a drive handle in a steady state, and a contact is stabilized by applying only a load in a contact direction of the contact. It is.

[0007]

According to a first aspect of the present invention, there is provided a pull switch which is rotatably supported on an insulating body and fixed to a fixed contact provided on the body. A switch mechanism having a drive handle for bringing the movable contact into and out of contact with the movable handle and a return spring for returning the drive handle to a predetermined position, and a tension operating tool attached to the drive handle and extended out of the body. A pull switch that drives the switch mechanism to open and close contacts by performing a pull operation, wherein the biasing side portion of the return spring abuts on a peripheral member of the drive handle in a steady state to perform the return. A load of a spring is not applied to the drive handle.

As described above, since the biasing side of the return spring is brought into contact with the peripheral member of the drive handle in a steady state, the load of the return spring is not applied to the drive handle.
The contact of the contact is stabilized. That is, in the past, the drive handle was brought into contact with its peripheral members by the elastic biasing of the return spring in the steady state, so the pressure at which the fixed contact and the movable contact came into contact was reduced by this contact force. By bringing the return spring itself into contact with the peripheral member as described above, no force is applied to the drive handle, and stable contact can be obtained. Also, since the drive handle does not hit the body, the shape of the drive handle can be freely adjusted.

[0009] The pull switch according to the second aspect is the first aspect.
, The biasing side of the return spring in a steady state is brought into contact with the body, and the load of the return spring is received by the body. As described above, since the biasing side of the return spring in the steady state is brought into contact with the body and the load of the return spring is received by the body, it is possible to form a stopper portion with which the return spring comes into contact when molding the body. realizable. Further, since the drive handle does not receive a load from the return spring, no load is applied to the body from the drive handle.

A third aspect of the present invention provides a pull switch according to the first aspect.
, A cover covering the switch mechanism is attached to the body, the biasing side of the return spring in a steady state is brought into contact with the cover, and the load of the return spring is received by the cover.
As described above, the biasing side of the return spring in the steady state is brought into contact with the cover, and the load of the return spring is received by the cover.
This can be realized by forming a stopper portion with which the return spring abuts during molding of the cover. Further, deformation of the body due to the return force of the return spring can be suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pull switch according to a first embodiment of the present invention will be described with reference to FIGS. FIG.
1 is a perspective view of a pull switch according to a first embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is an exploded perspective view of the pull switch of the embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. 3 is a partially cutaway perspective view of the pull switch of FIG. 1 to 4
1 is a body, 2 is a shoulder, 3 is a carriage, 4 is a drive handle, 5 is a return spring, 6 is a conductive spring, 7 is a fixed contact,
Reference numeral 8 denotes a movable contact, 9 denotes a tension operating tool, 10 denotes a switch mechanism, and 11 denotes a cover.

In this pull switch, a switch mechanism 10 is housed in an insulating body 1 and a pulling operation tool 9 is pulled to drive the switch mechanism 10 to open and close a contact. At the bottom of the body 1, a step seat 2 and a pair of fixed contacts 7, 7 are provided. In addition, the wire insertion hole 12, the wire release hole 13, the pulling operation tool insertion opening 14, and the mounting nut insertion portion 15 are integrally formed with the body 1. The switch mechanism unit 10 includes a drive handle 4 that is rotatably supported by a shaft and rotatably contacts and separates a movable contact 8 with respect to a fixed contact 7 provided on the body 1, and a coil spring (return) that returns the drive handle 4 to a predetermined position. Spring 5).

The drive handle 4 is disposed on the step seat 2 via the step wheel 3 and is supported by a shaft 16. The lower end of the mandrel 16 is fitted and fixed in a hole provided in the body 1 (FIG. 4). In this case, as shown in FIG. 3, a pair of arms 4b, 4b having a pair of movable contacts 8, 8, respectively, corresponding to the pair of fixed contacts 7, 7, project from the disk-shaped portion 4a of the drive handle 4. It is set up. A bent piece 2 obtained by bending one end of one arm 4b
3, a tension operating tool mounting groove 17 is provided, and the urging side portion 5a of the coil spring 5 is locked in this. The tension operating tool mounting groove 17 has a substantially C-shape whose groove width is larger than the cross section of the coil spring 5. The groove opening serves as an insertion portion into which the biasing side portion 5a of the coil spring 5 is inserted. The groove opening is formed to have a size approximately equal to the diameter of the coil spring 5, and tapered guide surfaces are formed on both sides thereof. The disc-shaped portion 4a is provided with a through hole 21 in which the claw of the gear 3 is locked.

The base end of the coil spring 5 is fixed to the body 1 by the biasing side 5a so that the drive handle 4 can return to a predetermined position. At the predetermined position, the fixed contact 7 and the movable contact 8 are in contact with each other. At this time, as shown in FIGS. 1 and 2, the biasing side portion 5a of the coil spring 5 comes into contact with a stopper portion 18 which is a peripheral member provided on the body 1, and the load (return force) of the coil spring 5 is applied to the body. It is directly received by the first stopper portion 18. Further, one arm 4b of the drive handle 4 is separated from the body 1 by a gap D and does not receive a load from the coil spring 5, so that no load is applied to the body 1.

The conductive spring 6 includes an external electric wire and the drive handle 4.
And is attached to the body 1 so as to press the drive handle 4. In this case, the external electric wire connection portion 1 is formed so as to correspond to the electric wire insertion hole 12 provided in the body 1.
9 are formed. The tension operating tool 9 has a hook portion 20a provided at the tip of the string-shaped portion 20, and the hook portion 20a is hooked in the tension operating tool mounting groove 17 on the side opposite to the coil spring 5 which is locked. The cord-like portion 20 extends outside from a tensioning tool insertion opening 14 provided in the body 1. The cover 11 is attached to the opening of the body 1 and covers the switch mechanism 10 and presses the upper end of the mandrel 16.

In the operation of the pull switch having the above-described structure, the fixed contacts 7 are always closed via the drive handle 4 between the fixed contacts 7 and 7. , And a downward claw is engaged with the step seat 2. When the driving handle 4 is rotated by pulling the pulling operation tool 9, the stepping gear 3 is moved downward with the upwardly extending pawl in one direction around the mandrel 16 together with the through hole 21 around the driving handle 4. Is rotated so as to get over the stage 2 and is displaced by a predetermined angle corresponding to one stage of the stage 2, so that the drive handle is lifted up and the fixed contact 7 is opened. After that, when the pulling operation tool 9 is released, the drive handle 4 is rotated by the coil spring 5 to return to the predetermined position,
The path between the fixed contacts 7 is closed. That is, when the drive handle 4 is rotated to return to the predetermined position, the gear wheel 3 is locked and restrained by the shoulder 2, so that only the drive handle 4 rotates on the shoulder 2. Become.

In the steady state, as shown in FIG. 2, the biasing side 5a of the coil spring 5 abuts against the stopper 18, so that the load of the coil spring 5 is not applied to the drive handle 4. For this reason, the force with which the drive handle comes into contact with the stopper portion as in the related art does not reduce the pressure at which the contact of the conductive spring 6 perpendicular to the force is brought into contact, and the force of the conductive spring 6 is applied to the contact as it is. A stable contact can be obtained. In addition, since the drive handle 4 does not hit the body 1, the shape of the drive handle 4 can be freely adjusted.

A pull switch according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a partially cutaway perspective view of a pull switch according to a second embodiment of the present invention, and FIG. 6 is a front view thereof. In this embodiment, the stopper 18 protrudes from the inner surface of the cover 11. In this case, similarly to the first embodiment, the coil spring 5
Is locked in the tension operating tool mounting groove 17 provided in the bent piece 23, but the stopper 18 is disposed inside the bent piece 23. For this reason, a portion of the coil spring 5 from the proximal end of the urging side portion 5a comes into contact with the stopper portion 18, so that the force applied to the stopper portion 18 can be reduced. Further, since the load of the coil spring 5 is received by the cover 11, the deformation of the body 1 due to the returning force of the coil spring 5 can be suppressed. Other configuration effects are the same as those of the first embodiment.

The movable contact may be provided on a member different from the drive handle (FIG. 8), or the movable contact may be provided on the gear train (FIG. 7). Further, since there is a margin in a state where the biasing side portion 5a of the coil spring 5 is locked in the pulling operation tool mounting groove 17, the movable portion can be moved to the drive handle 4 in a steady state, but the range may be changed as appropriate. .

[0020]

According to the pull switch of the first aspect of the present invention, the load of the return spring is applied to the drive handle by bringing the biasing side of the return spring into contact with the peripheral member of the drive handle in a steady state. Since this is not added, the pressure at which the fixed contact and the movable contact come into contact with each other can be prevented from lowering by pressing the drive handle against its peripheral members by the elastic biasing of the return spring in a steady state as in the prior art. That is,
By bringing the return spring itself into contact with the peripheral member as described above, no force is applied to the drive handle, and stable contact can be obtained. Also, since the drive handle does not hit the body, the shape of the drive handle can be freely adjusted.

According to the second aspect of the present invention, the biasing side of the return spring in the steady state is brought into contact with the body, and the load of the return spring is received by the body. It can be realized by keeping it. Further, since the drive handle does not receive a load from the return spring, no load is applied to the body from the drive handle.

In the third aspect, the biasing side of the return spring in the steady state is brought into contact with the cover, and the load of the return spring is received by the cover. It can be realized by keeping it. In addition, deformation of the body due to the return force of the return spring can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pull switch according to a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an exploded perspective view of the pull switch according to the embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of the pull switch according to the embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a pull switch according to a second embodiment of the present invention.

FIG. 6 is a front view of FIG. 2;

FIG. 7 is an exploded perspective view of a conventional example.

FIG. 8 is an exploded perspective view of another conventional example.

FIG. 9 is a front view of a conventional example.

FIG. 10 is an explanatory diagram showing an operation direction of a pull switch.

FIG. 11 is an explanatory diagram showing a conventional problem.

FIG. 12 is an explanatory diagram showing a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 4 Drive handle 5 Coil spring 6 Conductive spring 7 Fixed contact 8 Movable contact 9 Pulling operation tool 10 Switch mechanism 11 Cover 18 Stopper

Claims (3)

[Claims] 1. A drive handle rotatably supported by an insulative body for moving a movable contact to and from a fixed contact provided on the body, and a return spring for returning the drive handle to a predetermined position. A pull switch for providing a switch mechanism having a, pulling a pull operation tool attached to the drive handle and extending out of the body to drive the switch mechanism to open and close contacts, A pull switch, wherein a load of the return spring is not applied to the drive handle by bringing a biasing side portion of the return spring into contact with a peripheral member of the drive handle in a steady state. 2. The pull switch according to claim 1, wherein a biasing side portion of the return spring in a steady state is brought into contact with the body, and the load of the return spring is received by the body. 3. A cover for covering a switch mechanism is attached to the body, a biasing side of a return spring in a steady state is brought into contact with the cover, and the load of the return spring is received by the cover. Pull switch.