JP5604288B2 - Push-button switch - Google Patents

Description

  The present invention relates to a push button switch, and more particularly to a push button switch that is applied to an arc countermeasure structure of a push button switch for minute current, and particularly in a field requiring contact reliability.

  As shown in FIGS. 4 and 5, in the push button switch in the prior art, a pair of fixed contact pieces 34 </ b> A are arranged apart from each other in the housing 11 including the frame 12 and the case 13, and the fixed contact pieces 34 </ b> A are arranged on the fixed contact pieces 34 </ b> A. A sliding body 21A arranged so as to guide the movable contact piece 26A, a cylindrical push button 22 projecting upward from an upper center position of the sliding body 21A, and a lower center of the sliding body 21A A return spring 23 that urges the sliding body 21A itself upward at a position, a cylindrical movable contact support 24 that protrudes downward at both ends of the slide 21A, and a movable contact support 24 A contact spring 31A disposed so as to be supported by the movable contact piece 26A, a rod-like movable contact piece 26A accommodated in a movable contact engagement hole 25A provided in the movable contact support 24, and Movable A pair of stationary strips 34A provided at a position sandwiching the movable contact piece support 24 at the lower position of piece 26A, and is largely constituted by.

  The fixed contact piece 34A is formed by bending the conductive plate member at a right angle and further bending the bent rear end side at a right angle in the opposite direction, and cutting the middle position into a square shape at the upper end of the base portion. A single contact portion (fixed contact) 32 is formed.

  The movable contact piece 26A is formed in a rod shape and is plated with gold. The movable contact piece 26A is configured to press the movable contact piece contact portions 36 at both ends against the movable contact piece abutting portion 32 to obtain an electrical connection. ing.

  In the switch having such a configuration, first, the state before the push button 22 is pushed is that the sliding body 21A connected to the push button 22 is pushed by the return spring 23 and pushed by the inner wall of the housing 11. Therefore, the movable contact piece 26A attached to the movable contact piece support 24 is also locked at a position above the fixed contact piece 34A. In this state, when the push button 22 is pressed, the sliding body 21A connected to the push button 22 is pushed downward against the urging force of the return spring 23, and the movable contact piece support 24 is also linked thereto. The movable contact piece 26A also moves downward and approaches the movable contact piece contact portion (fixed contact) 32 of the fixed contact piece. If the push button 22 is further pressed continuously, as shown in FIG. 5, the sliding body 21A is further pressed downward, and the movable contact piece support 24 is also linked and pushed downward, thereby moving the movable contact piece. The movable contact piece contact portion 36 of 26A comes into contact with the movable contact piece contact portion (fixed contact) 32 of the fixed contact piece 34A. After the movable contact piece 26A comes into contact with the movable contact piece contact portion (fixed contact) 32, the contact spring 31A urges the movable contact piece 26A to push the movable contact piece 26A. It acts to maintain a good contact state with the single contact portion (fixed contact) 32.

JP-A-2005-78852

  However, the push button switch described in the prior art has a contact structure in which the gold-plated movable contact piece is pressed against the movable contact piece contact portion (fixed contact) of the fixed contact piece. An arc is generated at the time of contact by pressing and making contact. For this reason, there is a problem in that the gold plating applied to the movable contact piece is scattered due to repeated generation of arcs, so that the substrate is exposed and the contact reliability is lowered.

Therefore, it has the subject which must be solved to make it the mechanism which takes a countermeasure against an arc by adding an auxiliary contact separately with respect to the conventional contact type contact structure.
Specifically, the first contact portion, which is an auxiliary contact, has a structure having two contact mechanisms, and a movable contact with a silver rivet contact is adopted. In order to prevent a decrease in reliability, a movable contact piece by conventional gold plating is used for the second contact portion which is a main contact, and a structure for improving contact reliability by the gold plating contact piece is adopted.
In the case of a conventional mechanism with auxiliary contacts, since the first and second contact portions are attached to different locations, there is a problem that the switch mechanism becomes complicated and the switch body becomes large. In the present invention, the first and second contact portions are arranged on the same line, and the movable contact of the second contact portion also serves as a member for preventing the movable contact piece of the first contact portion from falling off. The switch body can be mounted without increasing the size and without employing additional parts.

  Further, in the case of a circuit specification in which no arc is generated, a mechanism in which the first contact portion (silver rivet contact) as an auxiliary contact is deleted can be employed.

  In order to solve the above problems, the push button switch of the present invention is configured as follows.

(1) Push button switch
A pair of fixed contacts disposed inside the housing;
A push button fitted to the housing so as to be able to advance and retreat;
A sliding body connected to the push button, guiding the second movable contact piece and contacting the second contact point of the fixed contact piece;
A push button switch with
The sliding body is guided by the first movable contact piece and brought into contact with the first contact point of the fixed contact piece before the second movable contact piece is guided and brought into contact with the second contact point of the fixed contact piece. It has a mechanism.
(2) The push button switch according to (1), wherein the first movable contact piece and the second movable contact piece are provided on the same axis.
(3) The push button switch according to (2), wherein the second movable contact piece also serves as a member for preventing the first movable contact piece from falling off.
(4) The push button switch according to (1), wherein a mechanism in which the first movable contact piece is deleted in the same component can be adopted.

  The push button switch according to the present invention can be provided with an auxiliary contact mechanism for preventing arcs, and the auxiliary contact is brought into contact with the main contact before the main contact comes into contact. Can be blocked.

1 is an overall perspective view showing a partial cross section of a push button switch according to the present invention. FIG. 5 is a perspective view showing a cross section of the main and auxiliary movable contact mechanism. FIG. 6 is a perspective view showing a state where the auxiliary movable contact is in contact with the fixed contact. It is the whole perspective view shown with a partial section of a pushbutton switch in the prior art. It is the perspective view which showed a mode that the movable contact contacted the fixed contact similarly.

  An embodiment of a push button switch according to the present invention will be described with reference to the drawings.

  In the push button switch according to the present invention, as shown in FIGS. 1 to 3, a pair of fixed contact pieces 34 are arranged apart from each other in the housing 11, and the movable contact pieces are guided to the fixed contact pieces 34. The sliding body 21 arranged as described above, the cylindrical push button 22 projecting upward from the upper center position of the sliding body 21, and the sliding body 21 itself at the lower center position of the sliding body 21. A return spring 23 biased upward, a cylindrical movable contact support 24 projecting downward at both ends of the sliding body 21, and a second movable provided on the movable contact support 24. A sliding body engagement hole 27 is formed which is supported by the second movable contact piece 26 accommodated in the contact piece engagement hole 25 and has a size penetrating the outer periphery of the movable contact piece support 24. Around the outer periphery of the first movable contact piece 28 and the movable contact piece support 24 The first movable contact piece spring 29 disposed so as to be supported by the first movable contact piece, and the second movable contact piece engagement hole 25 provided in the movable contact piece support 24, is accommodated in the first movable piece. A rod-shaped second movable contact piece 26 that supports the contact piece 28, and a second movable contact piece 26 that is accommodated in the movable contact piece support 24 and accommodated in the second movable contact piece engagement hole 25. A contact spring 31 for the second movable contact piece arranged to support the second movable contact piece 26 is disposed on both sides of the movable contact piece support 24 at a lower position of the second movable contact piece 26, and contacts the second movable contact piece 26. 2 fixed contact 32 and fixed contact piece 34 provided with first fixed contact 33 that contacts movable contact 35 of first movable contact piece 28.

The first movable contact piece 28 is a so-called auxiliary contact piece. The first movable contact piece 28 is provided with a first movable contact 35 formed in a rivet shape by covering (cladding) silver on both end sides of a long flat plate member. A sliding body engaging hole 27 having a size penetrating the outer periphery of the movable contact piece support 24 is provided.
The first movable contact piece 28 functions only as an auxiliary contact piece. Therefore, depending on the specification, the first movable contact piece 28 can be prevented from functioning. A mechanism in which the first movable contact piece 28 (including the first movable contact 35) and the first fixed contact 33 are omitted may be employed.

The second movable contact piece 26 is a so-called main contact piece, which is formed in a rod shape and plated with gold. Both ends of the second movable contact piece are pressed against the second fixed contact 32 to obtain an electrical connection. The movable contact piece contact portion 36 is formed.
The second movable contact piece 26 accommodated in the second movable contact piece engaging hole 25 supports the first movable contact piece 28 fitted to the movable contact piece support 24 on the lower side. Thus, the first movable contact piece 28 is prevented from falling off.

  The fixed contact piece 34 is configured to contact the first movable contact 35 of the first movable contact piece 28 and the second movable contact piece contact portion 36 of the second movable contact piece 26 with the same member. Like the one used, the conductive plate member is bent at a right angle, and the rear end portion of the conductive plate member is further bent at a right angle in the opposite direction. A movable contact piece contact portion (second fixed contact) 32 that contacts the second movable contact piece contact portion 36 of the movable contact piece 26 is formed. Similarly, a rivet-shaped first fixed contact 33 that contacts a first movable contact 35 formed in a rivet shape of the first movable contact piece 28 is provided at a horizontal position bent at a right angle.

  In the switch having such a configuration, first, the state before the push button 22 is pushed is that the sliding body 21 connected to the push button 22 is pushed by the return spring 23 and pushed by the inner wall of the housing 11. Maintain state. Therefore, the first movable contact piece 28 and the second movable contact piece 26 attached to the movable contact piece support 24 are in a state of being locked at an upper position than the fixed contact piece 34.

  In this state, when the push button 22 is pressed, the sliding body 21 connected to the push button 22 is pushed down against the urging force of the return spring 23, and the movable contact support 24 is also linked thereto. First, the first movable contact piece 28 also moves downward, and the first movable contact 35 contacts the first fixed contact 33.

  If the push button 22 is further pressed continuously, the sliding body 21 is further pushed downward, and the movable contact piece support 24 is also linked and pushed downward, so that the second movable contact piece 26 is moved in the second direction. The contact piece contact portion 36 contacts the second fixed contact 32 of the fixed contact piece 34. After the second movable contact piece contact portion 36 of the second movable contact piece 26 comes into contact with the second fixed contact 32, the second movable contact spring 31 pushes the second movable contact piece 28 in a direction. By urging, the second movable contact piece 26 acts to maintain a good contact state with the second fixed contact 32.

  Similarly, even after the first movable contact 35 of the first movable contact piece 28 contacts the first fixed contact 33, the first movable contact piece contact spring 29 is attached in the direction in which the first movable contact piece 28 is pushed. By energizing, the contact state of the first movable contact piece 28 to the first fixed contact 33 is favorably maintained.

  Provided is a push button switch having a mechanism for taking arc countermeasures at a main contact by adding an auxiliary contact separately in a contact type contact contact structure.

DESCRIPTION OF SYMBOLS 11 Housing 12 Frame 13 Case 21 Slide body 22 Push button 23 Return spring 24 Movable contact piece support body 25 Second movable contact piece engagement hole 26 Second movable contact piece 27 Slider engagement hole 28 First movable contact piece 29 Contact spring 31 for first movable contact 31 Contact spring 32 for second movable contact 32 Second fixed contact 33 First fixed contact 34 Fixed contact 35 First movable contact 36 Second movable contact contacting portion

Claims (4)

A pair of fixed contact pieces disposed at least partially inside the housing;
A push button fitted to the housing so as to be able to advance and retreat;
A first movable contact piece that contacts the pair of fixed contact pieces and conducts between the pair of fixed contact pieces when the push button is pressed ;
When the push button is pressed, in contact with the pair of stationary strips later than the first movable contact piece, a second movable contact piece which conduction between the pair of stationary strips,
With, a push-button switch,
It has a cylindrical movable contact support ,
The first movable contact piece is
The first movable contact piece contact spring arranged around the outer periphery of the movable contact piece support is biased in a direction in contact with the fixed contact piece,
The second movable contact piece is
Urged in a direction in contact with the stationary contact piece by a second movable contact piece contact spring disposed inside the movable contact piece support;
Push-button switch. A pair of fixed contact pieces disposed at least partially inside the housing;
A push button fitted to the housing so as to be able to advance and retreat;
A first movable contact piece that contacts the pair of fixed contact pieces and conducts between the pair of fixed contact pieces when the push button is pressed ;
When the push button is pressed, in contact with the pair of stationary strips later than the first movable contact piece, a second movable contact piece which conduction between the pair of stationary strips,
With, a push-button switch,
It has a cylindrical movable contact support ,
The first movable contact piece is
An engagement hole for a circular sliding body into which the movable contact piece support is inserted;
The second movable contact piece is
It is rod-shaped,
Arranged through a pair of second movable contact engagement holes provided in the movable contact support,
Preventing the first movable contact piece from falling off;
Push-button switch. A pair of fixed contact pieces disposed at least partially inside the housing;
A push button fitted to the housing so as to be able to advance and retreat;
A first movable contact piece that contacts the pair of fixed contact pieces and conducts between the pair of fixed contact pieces when the push button is pressed ;
When the push button is pressed, in contact with the pair of stationary strips later than the first movable contact piece, a second movable contact piece which conduction between the pair of stationary strips,
With, a push-button switch,
It has a cylindrical movable contact support ,
The first movable contact piece is
An engagement hole for a circular sliding body into which the movable contact piece support is inserted;
The second movable contact piece is
The rod is longer than the diameter of the sliding hole engaging hole of the first movable contact piece,
Through a pair of second movable contact engagement holes provided in the movable contact support,
Arranged at a position closer to the fixed contact piece than the first movable contact piece,
Push-button switch. A pair of fixed contact pieces disposed at least partially inside the housing;
A push button fitted to the housing so as to be able to advance and retreat;
A first movable contact piece that contacts the pair of fixed contact pieces and conducts between the pair of fixed contact pieces when the push button is pressed ;
When the push button is pressed, in contact with the pair of stationary strips later than the first movable contact piece, a second movable contact piece which conduction between the pair of stationary strips,
With, a push-button switch,
It has a cylindrical movable contact support ,
The first movable contact piece is
An engagement hole for a circular sliding body into which the movable contact piece support is inserted;
The first movable contact piece contact spring arranged around the outer periphery of the movable contact piece support is biased in a direction in contact with the fixed contact piece,
The second movable contact piece is
It is rod-shaped,
Arranged through a pair of second movable contact engagement holes provided in the movable contact support,
Preventing the first movable contact piece from falling off;
Urged in a direction in contact with the stationary contact piece by a second movable contact piece contact spring disposed inside the movable contact piece support;
Push-button switch.

Images