JPH0140097Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention provides a contact point at the tip of a contact piece made of two conductive strips, and moves one movable contact piece in the direction of the other fixed contact piece. The present invention relates to a leaf switch whose contacts are turned on by being displaced so that both contacts come into contact with each other, and which can ensure that the contacts are in contact during operation.

[Prior Art] In conventional leaf switches of this type, in order to perform the desired opening and closing operations reliably, it is necessary to accurately adjust the distance between the two contact pieces one by one after assembly, and this work is difficult. This was extremely troublesome and required time and effort. Another drawback was that chattering due to the free vibration of the contact piece was likely to occur during operation.

In order to prevent chattering, contacts 1 and 2 are provided at the tip as shown in Fig. 4a, and between contact pieces 4 and 5 supported in parallel by a base 3 made of an insulating material, an insulating material is provided. A flexible piece 6 having a square cross section is attached to one of the contact pieces 4 to damp and absorb vibrations, or as shown in FIG.
The contact pieces 4, 5 are supported by the support parts 7, 8 formed integrally with the
are held in place, and these contact pieces 4, 5
It is known that the shape is bent in a predetermined direction.

Although these chattering prevention means are effective to some extent, the former may cause chattering if the driving force to the movable contact piece 4 is large, and the latter is sufficiently effective against chattering, but the movable contact piece 4, 5 has to be large, making it unsuitable for small switches.

[Purpose of the invention] The purpose of the invention is to provide a leaf switch that eliminates the above-mentioned drawbacks, prevents chattering, ensures reliable contact between contacts, enables a compact structure, and is easy to assemble and adjust. There is a particular thing.

[Summary of the invention] The gist of the invention to achieve the above objectives is as follows:
The base ends of a fixed contact piece and a movable contact piece that face each other in parallel are held in an insulating material, and the movable contact piece is driven toward the fixed contact side to open and close the contacts provided at the tips of both contact pieces. In a leaf switch that performs This leaf switch is characterized in that before the contacts come into contact with each other, the ends make slight contact with each other, and then they are released from the locked state.

[Embodiments of the invention] The invention will be explained in detail based on the embodiments shown in FIGS. 1 to 3.

FIG. 1 shows an embodiment of a leaf switch according to the present invention. In FIG. 1, 10 is a movable contact piece made of a metal spring, and 11 is a fixed contact piece made of the same material, which are arranged almost parallel to each other, and at their bases there is an insulating material made of synthetic resin. The base 12 is made of, for example, molded. Furthermore, contacts 13 and 14 are formed on the inside near the tips of the contact pieces 10 and 11, respectively, and a plate-shaped drive piece 15 made of an insulating material is attached to the tip of the movable contact piece 10. has been done. A rectangular first locking piece 16 made of an insulating material such as synthetic resin is attached to the intermediate portion of the fixed contact piece 11 . Further, a second locking piece 17 is provided using a part of the drive piece 15 attached to the movable contact piece 10, and its position is slightly shifted from the first locking piece 16. As shown in FIG. 2, when these come into contact, their ends slightly touch each other. An end surface 17a of the second locking piece 17 facing the contact 13 side is sloped so that the tip of the locking piece 17 is wide. In addition, 18,
Reference numeral 19 indicates a connection end at the end of the contact pieces 10 and 11, which is connected to a lead wire by soldering or the like.

When not in operation, generally the first and second locking pieces 1
6 and 17 are separated as shown in FIG. 1, but a driving member (not shown) such as a magnetic lever applies a driving force to the movable contact piece 10 from above to below in the direction of the arrow shown in FIG. , is applied to the movable contact piece 10 via the drive piece 15, the movable contact piece 10 moves downward, and the second locking piece 17 engages the first locking piece 16 as shown in FIG. Make temporary contact. Due to this contact, force is stored in the movable contact piece 10, and when driving force is further applied by the drive piece 15, the first and second locking pieces 16, 17 are disengaged from each other, and due to their inertial force. As shown in Figure 3,
Contact point 13 of movable contact piece 10 and contact point 14 of fixed contact piece 2
They come into contact with each other all at once, and a conductive state is obtained.

When the contact pieces 13 and 14 are in contact with each other, as shown in FIG.
6, 17 comrades are already far away, both contact points 1
It is designed so as not to affect the contact pressure between 3 and 14.

When the driving force to the drive piece 15 is released, the movable contact piece 10 returns to its original position, but the chattering that tends to occur at this time is caused by the locking piece 1 as shown in FIG.
6, 17 When the comrades come into contact again, the vibration force is absorbed and will not be generated.

Moreover, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made. For example, the locking pieces 16 and 17 are not provided with an insulating member on both the contact pieces 10 and 11, but only one of the locking pieces is made of an insulating material, and the other locking piece is formed by processing the contact pieces. You can do it like this.

[Effects of the invention] As explained above, the leaf switch according to the invention connects the contacts using the inertia force that disengages the locking pieces, so the contacts can be made in a short time. This has the advantage of preventing arcing and is also effective in preventing chattering. Furthermore, since at least a predetermined spacing between the contact pieces is obtained by contact between the locking pieces, there is an advantage that the spacing between the contact pieces does not need to be precisely adjusted.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the leaf switch according to the present invention, FIG. 1 is a cross-sectional view thereof, FIGS. 2 and 3 are cross-sectional views during operation, and FIG. Figures a and b are side views showing a conventional chattering prevention mechanism. 10 is a movable contact piece, 11 is a fixed contact piece, 12 is a base, 13 and 14 are contacts, 15 is a drive piece, 1
6 and 17 are locking pieces.

Claims (1)

[Scope of utility model registration request] The base ends of a fixed contact piece and a movable contact piece that face each other in parallel are held in an insulating material, and the movable contact piece is driven toward the fixed contact side to open and close the contacts provided at the tips of both contact pieces. In a leaf switch that performs Before the contacts come into contact with each other, the ends slightly contact each other,
A leaf switch characterized in that the leaf switch is then released from the locked state.