JP2623053B2 - Push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small three-stage push button switch having a simple structure.

[0002]

2. Description of the Related Art Conventionally, in a push button switch, for example, a pendant switch used for a hoist crane,
A two-stage push-button switch is used so that the travel speed of the hoist crane can be controlled in two stages of low speed and high speed by depressing one push button. By the way, in recent years, there has been a demand for the development of a push button switch capable of controlling the traveling speed of the hoist crane in multiple steps for the purpose of improving the productivity of a factory, etc. There was a problem that it became complicated. For example,
The hoist crane's traveling speed, etc.
In the case of a three-stage push button switch that can be controlled in stages, the arrangement of the fixed contact and the movable contact can be as shown in FIG. 7, but this three-stage push button switch has three fixed contacts arranged side by side on one side. Therefore, it was physically impossible to incorporate the pendant switch unit into a conventional size.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-stage push button switch which is small and simple in structure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. In a push button switch provided so that a push button can be depressed on a contact board, the push button switch has four push buttons with respect to the one push button. And four movable contacts urged in the direction of pushing down the push button by a fixed contact and a spring. The four fixed contacts are a first fixed contact and a fourth fixed contact located adjacent to the first fixed contact. Two fixed contacts and a third fixed contact;
The third movable contact comprises a contact disposed at a vertex of a quadrangle of a fourth fixed contact located on a diagonal line of the fixed contact, wherein the three movable contacts are a first movable contact that closes the first fixed contact and the second fixed contact. And a second movable contact that closes the first fixed contact and the third fixed contact, which is provided so as to partially overlap the first movable contact, and is provided so as to partially overlap the first movable contact. Any one of the movable contacts of the third movable contact closing the second fixed contact and the fourth fixed contact is constituted by a contact arranged with a step so as to close the fixed contact in order. Moving the movable contact in a direction to close the fixed contact, and selecting any of the first fixed contact and the second fixed contact, the first fixed contact and the third fixed contact, and the second fixed contact and the fourth fixed contact. Are closed in order.

[0005]

When the push button is not depressed, each fixed contact is open. In the state where the push button is pushed down one step,
The first movable contact closes the first fixed contact and the second fixed contact to form a closed circuit including the first fixed contact and the second fixed contact. When the push button is pressed down by two steps, the second movable contact closes the first fixed contact and the third fixed contact, thereby forming a closed circuit including the first fixed contact and the third fixed contact. In a state where the push button is pressed down in three stages, the third movable contact closes the second fixed contact and the fourth fixed contact, so that the second fixed contact and the fourth fixed contact, that is, the first fixed contact, the second fixed contact and the fourth fixed contact are closed. A closed circuit including a fixed contact is configured. This allows
The first fixed contact is set to a common contact (input side) to constitute a three-stage push button switch. The above operation state is described for the case where the movable contact closes the fixed contact in the order of the first movable contact, the second movable contact, and the third movable contact by pressing down the push button in three stages. The order in which the contacts are closed is not limited to this. For example, the order of the first movable contact, the third movable contact, the second movable contact, the second movable contact,
Various selections such as the order of the first movable contact and the third movable contact can be made.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. The push button switch is provided with the push buttons 2 and 3 opposed to the contact base 1, the push button return spring 4 is interposed between the contact base 1 and the push buttons 2 and 3, and the push buttons 2 and 3 are pressed down in three steps. Steps (not shown) in which the steel balls 5 and the action springs 6 are fitted to the push buttons 2 and 3 side and the steel balls 5 are fitted to the contact stand 1 side so that the pressing can be performed stepwise and reliably. ) Is provided. An interlock 7 is provided between the push button 2 and the push button 3 for restoring the failed push button from the pushed state by pushing the other push button when one of the push buttons does not return in the pushed state due to a failure.

Each of the push buttons 2 and 3 is provided with four fixed contacts and three movable contacts for each push button. The fixed contact is a first fixed contact 4 disposed at the position of the apex of the square.
1, a second fixed contact 42 and a third fixed contact 43 located adjacent to the first fixed contact 41, and a fourth fixed contact 44 located diagonally to the first fixed contact 41. Fix it to the platform 1. The movable contact is a first fixed contact 4
A first movable contact 51 that closes the first and second fixed contacts 42, and a second movable contact 52 that closes the first fixed contact 41 and the third fixed contact 43 that are disposed so as to partially overlap the first movable contact 51.
And a third movable contact 53 that closes the fourth fixed contact 44 and a second fixed contact 42 that is arranged so as to partially overlap the first movable contact 51. Each movable contact 51, 52, 53 is a push button 2. 3 is inserted into a long hole 9 formed in the base of each movable contact 5.
A movable contact spring 10 is interposed between the upper surface of the elongated hole 9 and each of the movable contacts 51, 52, 53 so that the first, 52, 53 are always urged downward. The movable contact has contacts at both ends on the lower surface, and the movable contact on which the other movable contacts are placed on the upper portion also has contacts at the upper end. The lower surface of the long hole 9 is
By pressing down in stages, a step is formed so that any one of the movable contacts 51, 52, and 53 closes the fixed contact in order, that is, in a stepped manner, that is, the elongated hole 9 of the movable contact that closes the fixed contact in a state where the fixed contact is pushed down one step. The lower surface position is at the bottom, and the fixed contact is closed in a state where it is pushed down three steps.
Are provided such that the lower surface position of the top is the uppermost stage. The side surface of the contact stand 1 is closed by a partition plate 11.

[0008] In the above embodiment, the two opposite
Although the pushbutton switch having the two pushbuttons 2 and 3 has been described, the present invention is not limited to this, and the number of pushbutton switches may be one or three or more.

Next, the operation of the three-stage push button switch will be described with reference to FIGS. State in which the push button is not pressed down (FIGS. 5A and 6A): Each fixed contact 4
1, 42, 43, and 44 are open. Push button 1
Stepped down state (FIGS. 5B and 6B): the first movable contact 51 is the first fixed contact 41 and the second fixed contact 42
By closing the first fixed contact 41 and the second fixed contact 4
2 is constituted. A state in which the push button is pressed down by two steps (FIGS. 5C and 6C): the second movable contact 52 closes the first fixed contact 41 and the third fixed contact 43, so that the first fixed contact 41 and the third fixed contact 41 are closed. A closed circuit including the fixed contact 43 is configured. A state in which the push button is pressed down by three steps (FIGS. 5D and 6D): the third movable contact 53 is the second fixed contact 42
And the fourth fixed contact 44 is closed, so that the second fixed contact 4
2 and the fourth fixed contact 44, that is, a closed circuit including the first fixed contact 41, the second fixed contact 42, and the fourth fixed contact 44.

The above-mentioned operation state has been described for the case where the movable contact closes the fixed contact in the order of the first movable contact 51, the second movable contact 52, and the third movable contact 53 by pressing down the push button in three stages. However, the order in which the movable contacts close the fixed contacts is not limited to this. For example, the order of the first movable contact 51, the third movable contact 53, the second movable contact 52, the second movable contact 52, the first movable contact 51, third movable contact 53
The order can be variously selected.

[0011]

According to the present invention, there is provided a push button switch provided on a contact base so that the push button can be pushed down, wherein the push button switch is urged in the pushing direction of the push button by four fixed contacts and a spring with respect to the one push button. And three movable contacts, wherein the four fixed contacts are a first fixed contact, a second fixed contact and a third fixed contact located adjacent to the first fixed contact, and a first fixed contact.
The third movable contact comprises a contact disposed at a vertex of a quadrangle of a fourth fixed contact located on a diagonal line of the fixed contact, wherein the three movable contacts are a first movable contact that closes the first fixed contact and the second fixed contact. And a second movable contact that closes the first fixed contact and the third fixed contact, which is provided so as to partially overlap the first movable contact, and is provided so as to partially overlap the first movable contact. Any one of the movable contacts of the third movable contact closing the second fixed contact and the fourth fixed contact is constituted by a contact arranged with a step so as to close the fixed contact in order. Moving the movable contact in a direction to close the fixed contact, and selecting any of the first fixed contact and the second fixed contact, the first fixed contact and the third fixed contact, and the second fixed contact and the fourth fixed contact. Are closed in order, so they are small and Elephants it is possible to provide a simple three-stage push-button switch. In addition, the three-stage push button switch of the present invention has advantages of good operability, reliable operation, and durability. And 3 of the present invention
When a step push button switch is applied to a pendant switch used in a hoist crane, it can be incorporated into a pendant switch unit of a conventional size, thereby reducing the traveling speed of the hoist crane to three stages of low speed, medium speed, and high speed. Can be controlled.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a three-stage push button switch of the present invention.

FIG. 2 is a circuit diagram of a three-stage push button switch of the present invention.

FIG. 3 is an exploded perspective view of a three-stage push button switch of the present invention.

FIG. 4 is a view showing a movable contact of the present invention.

FIG. 5 is an exploded perspective view showing an operation state of the three-stage push button switch of the present invention.

FIG. 6 is a circuit diagram showing an operation state of a three-stage push button switch of the present invention.

FIG. 7 is an exploded perspective view of a conventional three-stage push button switch and its circuit diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact stand 2 Push button 3 Push button 41 1st fixed contact 42 2nd fixed contact 43 3rd fixed contact 44 4th fixed contact 51 1st movable contact 52 2nd movable contact 53 3rd movable contact

Claims (1)

(57) [Claims] In a push button switch provided on a contact base (1) so as to be able to push down a push button (2, 3), the push button switch comprises four fixed contacts and a spring (1
0) has three movable contacts which are urged in the direction of pushing down the push button, and the four fixed contacts are the first fixed contacts (4
1) and a second fixed contact (41) located adjacent to the first fixed contact (41).
A fixed contact (42) and a third fixed contact (43), and a fourth fixed contact (4) located on a diagonal line of the first fixed contact (41).
4) a contact disposed at the position of the vertex of the square, wherein the three movable contacts are the first fixed contact (41) and the second fixed contact (41).
A first movable contact (51) for closing the fixed contact (42), and the first fixed contact (41) and the third fixed contact (43) disposed so as to partially overlap the first movable contact (51). Movable contact (52) for closing the first movable contact (51)
The second fixed contact (4
2) and the third movable contact (5) closing the fourth fixed contact (44).
Any one of the movable contacts (51, 52, 53) of (3) consists of contacts arranged with steps so as to close the fixed contacts in order. The movable contacts (51, 52, 53) are moved in a direction to close the fixed contacts (41, 42, 43, 44), and the first fixed contacts (41) and the second fixed contacts (4) are moved.
2) The first fixed contact (41) and the third fixed contact (4)
3) and the second fixed contact (42) and the fourth fixed contact (4).
4) A push button switch wherein any one of the above is closed in order.