JPH0538506Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a switch used to switch between a receiving circuit and a speaking circuit of a telephone.

[Conventional technology]

As this type of switch, there is a type in which a movable contact piece is moved toward and away from a fixed contact piece through the operation of a movable body that is interlocked with an actuator. When such a type of hook switch is interposed in a circuit having a reactor, in a conventional hook switch in which the contacts are opened and closed by simply moving the movable contact piece into contact with and separating from the fixed contact piece, The spark that is generated the moment the movable contact piece separates from the fixed contact piece easily burns out the entire contact area of the movable contact piece and the fixed contact piece, which causes problems such as early deterioration of contact reliability and shortened service life. I was getting used to it.

[The problem that the idea aims to solve]

Therefore, as shown in FIG. 10, only the portion of the movable contact piece 200 having spring properties, which is located on the tip side from the intermediate portion in the longitudinal direction, is branched from the base side into a comb-tooth shape, and the individual comb-tooth portions 201, 202 are formed.
It has been considered that the contacts provided on the fixed contact piece 100 correspond to the contact pieces 101, 102 provided on the end face of the fixed contact piece 100, and that a slight step h is formed between the contacts 101, 102 of the fixed contact piece 100.

According to such a hook switch, one comb tooth portion 202 is fixed by pushing up the movable contact piece 200 that is in contact with the fixed contact piece 100 by a movable body (not shown), as shown by the solid line in the figure. After the contact piece 100 separates from the contact point 102, the contact point of the other comb tooth portion 201 separates from the contact point 101 after a time lag corresponding to the dimension of the step h. Even if the contact point of one comb tooth part 202 is separated, the movable contact piece 200 and the fixed contact piece 100 remain electrically connected while the contact point of the other comb tooth part 201 is in contact, so that no spark occurs. Sparks are generated only at the moment when the contact point of the other comb tooth section 201 separates, and the electrical conduction between the two ends, and no spark occurs at the moment when the contact point of the one comb tooth section 202 separates. Therefore,
Sparks are generated unevenly at the contacts of the other comb-teeth portion 201 and the corresponding contacts of the fixed contact piece 100, and the contacts of one comb-teeth portion 202 and the corresponding contacts 102 of the fixed contact piece 100 are protected from burnout. The contact reliability between the movable contact piece 200 and the fixed contact piece 100 is less likely to be impaired by burnout.

However, in the case of the one shown in FIG.
The contact points 101 and 10 of the fixed contact piece 100 having a step h are not extended over the entire length of the movable contact piece 200, but are only branched from the middle part of the movable contact piece 200.
2, there is a difference in the individual contact pressures when the contact points of both the comb tooth portions 201 and 202 are in contact with each other with spring force. That is, since the position of one comb tooth section 202 is regulated by the contact point of the other comb tooth section 201 coming into contact with the contact point 101 on the upper side, the contact point of one comb tooth section 202 and the contact point 202 on the lower side The contact pressure between the contact point of the other comb tooth portion 201 and the contact point 101 on the upper side is smaller than the contact pressure between the contact point of the other comb tooth portion 201 and the contact point 101 on the upper side. Therefore, in the case of the same figure, the contact reliability is not likely to be impaired due to burnout, but the contact reliability between the movable contact piece 200 and the fixed contact piece 100 is likely to be impaired due to imbalance in contact pressure. There is.

This idea was made in view of the above problems, and the purpose is to provide a hook switch that can suppress the decrease in contact reliability due to burnout and unbalanced contact pressure, and improve the service life. .

[Means to solve the problem]

The switch of this invention has a fixed contact piece, a movable contact piece with spring properties, and a movable contact piece that moves back and forth in a direction in which it is pushed against its spring property and in a direction in which the movable contact piece returns due to its spring property. Comprising a movable body,
The movable contact piece is branched into a comb-teeth shape only at the tip end side of the middle part in the longitudinal direction, and the movable contact piece is a fixed contact piece in which the contacts provided on each comb-teeth part of the movable contact piece are brought into contact and separated from each other. A plurality of contacts are set at the same level, and steps are formed in each part of the movable body corresponding to each of the comb teeth of the movable contact piece.

[Effect]

In the hook switch having the above configuration, when the movable contact piece retreats against its spring properties, the contacts of the individual comb teeth of the movable contact part separate from the contacts of the fixed contact piece, and the movable contact piece returns due to its spring properties. The operation in the case where the contacts of the individual comb teeth of the movable contact piece are configured to contact the contacts of the fixed contact piece will now be described.

When the individual comb tooth portions of the movable contact piece are pushed by the respective parts of the movable body having steps, the contact points of the comb tooth portions sequentially move away from the contact points of the fixed contact piece while maintaining a certain time lag. Therefore, a spark is generated between the contact point of the comb tooth section that finally leaves the contact point of the fixed contact piece and the corresponding contact point of the fixed contact piece, and the contact point of the other comb tooth section and the contact point of the corresponding fixed contact piece. Protects against burnout caused by sparks.

Further, since the respective contact points of the fixed contact piece are set at the same level, they contact the contact points of the individual comb-tooth portions of the movable contact piece with the same contact pressure, and no imbalance in contact pressure occurs.

When the movable contact piece retreats against its spring properties, the contacts of the individual comb teeth of the movable contact piece come into contact with the contacts of the fixed contact piece, and when the movable contact piece returns due to its spring properties, the movable contact piece The same applies even if the contacts of the individual comb teeth are configured to be separated from the contacts of the fixed contact piece.

〔Example〕

FIG. 1 is an exploded perspective view of a telephone switch using a rotary actuator, which is an embodiment of this invention. This switch includes a body 1, a cover 2, an actuator 3, a coiled torsion spring 4, a fixed contact unit 5, and a movable contact unit 6.

There are a plurality of fixed contact units 5 (three in the illustrated example).
The fixed contact pieces 51, 52, 53 are attached to the resin block 54.
Terminals 55, 56, and 57 are inserted into the resin block 54 and protrude below it. The fixed contact pieces 51, 52, and 53 all have the same shape, and as shown in FIG. The end surfaces on both sides of the portion 58 are contacts 51a and 51b having a rounded cross section, respectively, and these contacts 51a and 51b are set at the same level. The same applies to the other fixed contact pieces 52 and 53, and in FIG.
3b indicates a contact point having a rounded cross section. The resin block 54 is fitted from below into the opening 11 provided at one end of the bottom wall of the body 1, and the protrusion 59 of the resin block 54 is formed on the bottom wall of the body 1 as shown in FIGS. 5 and 6. Stepped recess 1
Fitted into 2.

The actuator 3 includes a rotor 31 and an arm 32 extending from one end of the rotor 31 in a direction perpendicular thereto. Partition pieces 33, 34, 35 are provided on the rotor 31 at regular intervals, and movable bodies 36, 37, 38 are integrally protruded between the partition pieces 33, 34, 35. Among these movable bodies 36 to 38, the central movable body 37 and the movable bodies 36 and 38 on both sides protrude in opposite directions, and the movable bodies 36 and 38 on both sides protrude in opposite directions.
As shown in FIGS. 1, 2, and 3, protrusions 36a and 38a are provided on one side of the distal ends of the movable bodies 36 and 38, extending from the distal end surfaces to the top surfaces of the distal ends. , 38a are provided, and a step is formed between the locations where they are not provided. This level difference may be very small, for example, about 0.05 mm. In FIGS. 3 and 7, the level difference is indicated by the symbol H. In this actuator 3, the shaft portion 31a on one end side of the rotor 31 is connected to the body 1.
The shaft portion 31b on the other end side is fitted into a recessed groove portion 14 formed on the other side wall of the body 1. An arm 32 is arranged outside the body 1 along one side wall thereof.

Further, the torsion spring 4 is fitted into a hole 39 provided in the rotor 31, and one winding end 41 of the torsion spring 4 is locked to the rotor 31 side.

There are multiple movable contact units 6 (three in the illustrated example).
The movable contact pieces 61, 62, 63 are attached to the resin block 64.
Terminals 65, 66, and 67 are inserted into the resin block 64 and protrude below it. The movable contact pieces 61, 62, and 63 all have the same shape, and as shown for one fixed contact piece 61 in FIG. By forming the notches 68, the individual comb-teeth portions 6 are branched into comb-teeth shapes.
Contacts 61a and 61b are provided in a linear manner at the tips of 9a and 69b, bulging downward. The other movable contact pieces 62 and 63 have a similar configuration. The resin block 64 was fitted from above into the opening 15 provided at the other end of the bottom wall of the body 1, and the locking claws 64a of the resin block 64 were formed on the body 1 as shown in FIGS. 5 and 6. It is locked by the engaging portion 16.

The cover 2 is placed over the body 1 from above, and the locking hole 22 of the hanging piece 21 locks with the locking claw 54a provided in the resin block 54 of the fixed contact piece unit 5, and , another plurality of hanging pieces 23 are respectively locked with locking claws 17 provided at predetermined locations on the side wall of the body 1. Then, the other winding end 42 of the torsion spring 4
is locked to the upper wall 24 of the cover 2. Further, the cover 2 is provided with a presser piece 25, and this presser piece 25 allows the shaft portion 31 of the actuator 3 to
a and 31b can be held in a freely rotatable state without wobbling. Although only the presser piece 25 corresponding to the shaft portion 31b is shown in FIG. 1, the presser piece corresponding to the shaft portion 31b is provided on the opposite side of the presser piece 25.

In the hook switch constructed by assembling the body 1, cover 2, actuator 3, coiled torsion spring 4, fixed contact unit 5, and movable contact unit 6 described above, the torsion spring 4, the rotor 31 is constantly urged in the direction indicated by arrow F in FIGS. 5 and 6. As shown in FIG. 2 for explanation of the movable contact piece 61, one of the two comb-teeth parts 69a and 69b of the movable contact piece 61
The middle part of a is the protrusion 36a at the tip of the movable body 36.
The intermediate portion of the other comb tooth portion 69b corresponds to the portion where the protrusion 36a at the tip of the movable body 36 is provided. Although not shown, the same applies to other movable contact pieces 63. However, the comb tooth portion of the movable contact piece 62 at the center corresponds to the movable body 37 at the center.

The operation at the time of contact switching will be explained with reference to FIGS. 5 to 9.

When no operating force is applied to the arm 32, the force of the torsion spring 4 causes the movable body 36 to move away from the movable contact piece 61 and to be located below it, as shown in FIGS. At this time, the movable contact piece 61
returns downward due to its own springiness, and contact point 6
1a and 61b are contacts 51a and 51 of the fixed contact piece 51
It is in contact with b. The contact pressure at this time is the same because the contacts 51a and 51b of the fixed contact piece 51 are at the same level.

When an operating force is applied to the arm 32 from this state and the arm 32 is rotated upward, the movable body 36 moves upward accordingly, and the comb teeth portions 69a and 69b resist the springiness of the movable body 36. It is pushed back upwards. During the retreat, the other comb tooth portion 69b corresponding to the location having the protrusion 36a is pushed up by the protrusion 36a, as shown in FIG. One comb tooth portion 6 that is separated from 51b and corresponds to a portion that does not have the protrusion 36a.
9a is pushed up by the movable body 36 and its contact 61a is connected to the fixed contact piece 51 as shown in FIGS. 6 and 7.
away from the contact point 51a. Even if the contact 61b of the other comb tooth portion 69b is separated from the contact 51b of the fixed contact piece 51, the movable contact piece 61 remains in contact while the contact 61a of one comb tooth portion 69a is in contact with the contact 51a of the fixed contact piece 51. Since the conductive state is maintained with respect to the fixed contact piece 51, no spark is generated at the moment the contact point 61b of the other comb tooth portion 69b separates from the contact point 51b of the fixed contact piece 51. The contact 61a of one comb tooth portion 69a is the contact 5 of the fixed contact piece 51.
A spark is generated for the first time at the moment it leaves 1a. The timing at which the contact point 61b of the other comb tooth section 69b separates from the contact point 51b of the fixed contact piece 51 always precedes the timing at which the contact point 61a of the one comb tooth section 69a separates from the contact point 51a of the fixed contact piece 51. When the is repeatedly opened and closed, the spark is generated at the contact point 61a of one comb tooth portion 69a.
and the contact point 51a of the fixed contact piece 51, thereby causing the contact point 61b of the other comb tooth portion 69b and the fixed contact piece 5 to
1 contact 51b is reliably protected from burnout due to spark generation. Further, the contact 51a of the fixed contact piece 51 has a rounded cross section, and this contact 51a
The contact point 61a of the comb tooth portion 69a that contacts the comb tooth portion 69a has a bulging shape and contacts the contact point 51a perpendicularly, so that when the two are in contact, the contact state is close to a point contact. . Therefore, even when the two are separated, there is little spark generation, and the contact 5
There is an advantage that burnout of 1a and 61a is suppressed to a minimum.

When the operating force applied to the arm 32 is released, the rotor 31 is rotated by the force of the torsion spring 4, and the movable body 36 is moved in the direction in which the movable contact piece 61 returns. Therefore, as shown in FIG.
After contacting the other comb tooth part 69 as shown in FIG.
The contact 61b of the fixed contact piece 51 contacts the contact 51b of the fixed contact piece 51.

The above description of the operation is about the movable contact piece 61 and the movable body 36, but the movable contact piece 63 and the movable body 3
A similar effect is achieved with respect to 8.

[Effect of idea]

According to this invention, even though there is no imbalance in contact pressure between the respective contacts of the fixed contact piece and the contacts of the individual comb teeth of the movable contact piece, the movable contact piece is removed from the fixed contact piece. Since the spark is generated at the moment of separation, it is limited to a specific contact on the fixed contact and the corresponding comb-teeth contact on the movable contact. Protected from burnout caused by outbreaks. Therefore, deterioration in contact reliability due to burnout or imbalance in contact pressure is less likely to occur, and the service life can be improved.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a hook switch according to an embodiment of this invention, Fig. 2 is a plan view of the actuator, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 is a fixed contact piece and a movable contact piece. An enlarged perspective view of the contact piece,
5 and 6 are cross-sectional views for explaining the action, FIGS. 7, 8, and 9 are action explanatory diagrams,
FIG. 10 is an explanatory diagram of a comparative example. 36, 38... Movable body, 51, 53... Fixed contact piece, 51a, 51b, 53a, 53b... Contact of fixed contact piece, 61, 63... Movable contact piece, 61a, 6
1b...Contact point of comb tooth portion, 69a, 69b...comb tooth portion, H...step.

Claims (1)

[Scope of Claim for Utility Model Registration] A fixed contact piece, a movable contact piece having spring properties, and reciprocating movement in a direction in which the movable contact piece is pushed against its spring property and in a direction in which the movable contact piece returns due to its spring property. The movable contact piece is branched in a comb-teeth shape only at a portion closer to the distal end than the middle portion in the longitudinal direction, and the contacts provided on the individual comb-teeth portions of the movable contact piece are branched. A plurality of contact points of the fixed contact pieces that are brought into contact and separated from each other are set at the same level, and steps are formed in each part of the movable body corresponding to each of the individual comb teeth of the movable contact piece. and a switch.