JPH0543428U - Contact switch - Google Patents

Abstract

(57) [Summary] [Purpose] To improve welding resistance. [Structure] A rigid conductive plate 2 having a movable contact 3 at a tip portion 2a thereof and a leaf spring 4 having a second end portion 4b supported at a substantially central portion thereof.
Has one end 4a fixed thereto and the base end 2b in the thickness direction of the driving member.
The movable contact 3 can be opened and closed by the fixed contact 1 by being driven by 5. Therefore, when the movable contact 3 is welded to the fixed contact 1, the conductive plate 2 is rigid and
Moreover, since the driving member 5 drives the base end portion 2b that is the farthest from the movable contact 3 provided on the tip end portion 2a of the conductive plate 2, the lever principle also works, so that the driving force of the driving member 5 is directly and directly. The welding force can be removed by being transmitted to the movable contact 3 with a large force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a contact switching device used for an electromagnetic relay or the like.

[0002]

[Prior Art]

 Conventionally, as this type of contact switching device, there is one shown in FIG.

This is composed of a fixed contact 11 fixed to a fixed contact plate 11a, a leaf spring 12 having a base end 12b supported by a support plate 12c, and a movable contact 13 provided at a tip 12a of the leaf spring 12. A drive member 14 that drives the movable contact 13 to open and close the movable contact 13 by driving the substantially central portion of the leaf spring 12 in the plate thickness direction as shown by the arrow.

Next, the operation will be described with reference to FIG. 5. First, in FIG. 5A, the drive member 14 presses the substantially central portion of the leaf spring 12 in the returning direction, and the movable contact 13 causes the fixed contact 11 to move. It is in the state of being separated with a predetermined gap. Here, when the driving member 14 is actuated by an electromagnet outside the drawing, the driving member 14 starts to push the substantially central portion of the leaf spring 12 in the plate thickness direction as shown in FIG. As the leaf spring 12 bends, the movable contact 13 provided at the front end 12a thereof comes into contact with the fixed contact 11 as shown in FIG. 6 (c), and then as shown in FIG. 3 (d). The fixed contact point 11 is closed by the contact pressure corresponding to the spring force of the leaf spring 12. Further, when the driving member 14 returns, it goes back to the state shown in FIG. 9A through the process reverse to the above.

[0005]

[Problems to be solved by the device]

 In the conventional contact switchgear described above, when operating normally, as shown in FIGS. 5 (a) to 5 (d), the driving member 14 causes the plate spring 12 to have a substantially central thickness. The movable contact 13 is opened and closed by the fixed contact 11 by driving in the direction.

However, when the movable contact 13 is welded to the fixed contact 11, the leaf spring 12 is pressed by the drive member 14 and bends as shown in FIG. 5 (e). There are things you can't do. Further, this is the same when the driving member 14 returns, although not shown.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a contact opening / closing device having more excellent welding resistance.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the contact switching device of the present invention has a fixed contact, a rigid conductive plate, a movable contact provided at the tip of the conductive plate, and one end in the substantially central part of the conductive plate. It is configured to have a plate spring that is fixed and supports the other end, and a drive member that drives the base end of the conductive plate in the plate thickness direction to open and close the movable contact to the fixed contact.

[0009]

[Action]

 According to the contact opening / closing device of the present invention, since the movable contact is welded to the fixed contact, the conductive plate is rigid and the driving member is provided at the front end of the conductive plate. The principle of leverage, which drives the base end that is the farthest from the movable contact, also works, so the driving force of the drive member can be transmitted to the movable contact directly and with a large force, and the welding can be pulled off. It has excellent welding resistance.

[0010]

【Example】

 A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a fixed contact, which is fixed to the tip of the fixed contact plate 1a. Reference numeral 2 is a conductive plate, which is made of copper or a copper alloy material and formed into a rigid body with a relatively large plate thickness.

Reference numeral 3 denotes a movable contact, which is fixed to the tip 2 a of the conductive plate 2 so as to be able to come in contact with and separate from the fixed contact 1.

Reference numeral 4 denotes a leaf spring, which is made of a conductive spring material such as phosphor bronze and has one end 4a fixed to the substantially central portion of the conductive plate 2 and arranged in parallel with the conductive plate 2 at an acute angle, and the other end 4b. It is fixedly supported by a support plate 4c located on the base end 2b side of the conductive plate 2.

Reference numeral 5 denotes a driving member, which is made of an insulating material such as synthetic resin and has driving pieces 5a and 5b facing each other in a U shape at a distance larger than the thickness of the conductive plate 2, and the driving piece 5a, It is arranged by sandwiching the base end portion 2b of the conducting plate 2 between the driving plates 5a and 5b, and the driving pieces 5a and 5b are electrically conductive plates as shown by arrows in FIG. The base end 2b of 2 is driven in the plate thickness direction.

Next, the operation will be described with reference to FIG. In the description, the direction in which the movable contact 3 is separated from the fixed contact 1 is the upward direction, and the direction in which the movable contact 3 is closed is the downward direction.

First, FIG. 1A shows the driving member 5 in the returning state, in which the driving piece 5b presses the base end portion 2b of the conductive plate 2 downward to thereby cause the leaf spring 4 to move. The upper part of the movable contact 3 is bent in a concave shape to hold the substantially central part of the conductive plate 2 at one end 4a, and the movable contact 3 is separated from the fixed contact 1 with a predetermined gap.

Here, when the driving member 5 operates in response to an electromagnet or the like (not shown), the base end portion 2b of the conductive plate 2 moves to the driving members 5a and 5b of the driving member 5 as shown in FIG. Neither is pressed, and the leaf spring 4 is in the free state at this time.

When the driving member 5 is further operated, the driving piece 5a pushes the base end portion 2b of the conductive plate 2 upward as shown in FIG. The movable contact 3 contacts the fixed contact 1.

When the driving member 5 further operates and the driving piece 5a pushes the base end portion 2b of the conductive plate 2 upward, the movable contact 3 comes into contact with the fixed contact 1 and is regulated. As shown in Figure (d), the leaf spring 4 is bent upward so that one end 4a, which holds the substantially central portion of the conductive plate 2 while bending the upper side upward, is higher than the position in Figure (c). The movable contact 3 is closed to the fixed contact 1 by a contact pressure corresponding to the spring force of moving the leaf spring 4 to return to the downward direction.

Further, when the driving member 5 returns, it goes back to the state shown in FIG. 9A through the process reverse to the above.

Next, a second embodiment will be described with reference to FIG. This is the same as the first embodiment except that the shape of the leaf spring 4 is different, and the other structure is the same, and the same members are designated by the same reference numerals.

The leaf spring 4 has one end 4a fixed to the substantially central portion of the conductive plate 2 and the other end 4b fixedly supported to the support plate 4c. It is formed by bending.

The operation is also substantially the same as that of the first embodiment, and the difference is the operation after the movable contact 3 comes into contact with the fixed contact 1. That is, when the movable contact 3 comes into contact with the fixed contact 1 and the driving member 5 further operates and the driving piece 5a presses the base end portion 2b of the conductive plate 2, the movable contact 3 comes into contact with the fixed contact 1. Since it is regulated, the movable contact 3 is fixed to the movable contact 3 with a contact pressure corresponding to the spring force that is bent in the direction in which the curved portion at the substantially central portion of the leaf spring 4 is expanded and tries to return to the original position against the expansion. Close to 1.

In any of the contact opening / closing devices according to the first and second embodiments, the rigid conductive plate 2 having the movable contact 3 at the tip 2a has the other end substantially at the center thereof. One end 4a of the leaf spring 4 supporting the portion 4b is fixed, and the base end 2b is driven by the driving member 5 in the plate thickness direction, so that the movable contact 3 can be opened and closed by the fixed contact 1. Therefore, when the movable contact 3 is welded to the fixed contact 1, the conductive plate 2 is a rigid body, and the driving member 5 is the most distant from the movable contact 3 provided at the tip 2a of the conductive plate 2. Since the lever principle of driving the base end portion 2b also works, the driving force of the driving member 5 can be directly and with a large force transmitted to the movable contact 3 to remove the welding, and the operation can be continued without any trouble. It will be possible.

[0025]

[Effect of the device]

 Since the contact opening / closing device of the present invention is constructed as described above, when the movable contact is welded to the fixed contact, the conductive plate is rigid and the driving member is connected to the movable contact provided at the tip of the conductive plate. Since the lever principle of driving the base end with the longest distance also works, the driving force of the driving member can be transmitted directly to the movable contact with a large force and the welding can be pulled off. Will be excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view for explaining the operation of the above.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is a front view for explaining the operation of the above.

[Explanation of symbols]

 1 Fixed contact 2 Conductive plate 2a Tip 2b Base end 3 Moving contact 4 Leaf spring 4a One end 4b The other end 5 Drive member

Claims (1)

[Scope of utility model registration request] 1. A fixed contact, a rigid conductive plate, a movable contact provided at the tip of the conductive plate, and a leaf spring having one end fixed to a substantially central portion of the conductive plate and the other end supported. A contact opening / closing device comprising: a drive member that drives a base end portion of a conductive plate in a plate thickness direction to open and close a movable contact to a fixed contact.