JPH0323634Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to a bridge-type contact device mainly used in a contact portion of a cam switch.

[Prior art and its problems]

As an example of a conventional cam switch of this type, the one shown in FIG. 8 is known. In the figure, fixed contacts 4a and 4b having extended terminals 2a and 2b and fixed contacts 3a and 3b integrated at their ends are disposed facing each other at intervals. A movable contact support 5 is disposed between the fixed contacts 4a and 4b so as to be able to reciprocate in a direction perpendicular thereto, and a camshaft 6 as a drive mechanism is fixed to one end of the contact support 5. A roller 8 connected to a cam 7 is pivotally supported, and a square-shaped movable contact 9 having movable contacts 10a and 10b fixed at both ends facing the fixed contacts 3a and 3b is placed at the other end. There is. Contact springs 11 and 11 are provided between both ends of the movable contactor 9 and seats on the inner wall of the case 1, respectively.
is inserted. The operation is such that the cam shaft 6 rotates and the roller 8 of the contact support 5 is inserted into the recess 7a of the cam 7.
When the movable contact 9 falls, the movable contacts 10a, 1 of the movable contact 9
0b is the fixed contact 3a of the fixed contacts 4a, 4b,
3b comes into contact.

However, this contactor device has a movable contactor 9
Since the contact portions at both ends of the are directly pressed by the contact springs 11, the movable contacts 10a, 10b are restrained and cannot slide in any direction other than the direction in which they are pressed by the spring 11, and the fixed contacts 3a, 3b and the movable contacts 10a, 10b are Contacts 3a, 3b, 10 are used for simple butt contact.
Even if the shapes of a and 10b are changed, if dust is present between the contact parts, it cannot be eliminated, and from the viewpoint of contact reliability, it is fully compatible with use in low voltage and micro current electronic circuit systems. The drawback was that I couldn't do it. If such a large current capacity is not required, contact reliability can be improved somewhat by providing two contacts at each end of the movable contact to create a so-called twin contact configuration. There is also the disadvantage that such changes in configuration cannot be easily carried out, since not only the movable contact must be replaced, but also the contact spring for the twin contacts must be replaced.

[Purpose of invention]

The object of this invention is to provide a bridging type contact device which can eliminate the above-mentioned conventional drawbacks and improve contact reliability without changing the main body dimensions.

[Key points of the idea]

The main point of this invention is that in order to achieve the above-mentioned purpose, the terminals are extended and arranged oppositely at intervals,
a pair of fixed contacts each having a contact point at an end; a movable contact support disposed between the fixed contacts so as to be able to reciprocate in a direction perpendicular thereto; one end connected to a drive mechanism; a flexible movable contact that has one or two contacts that can come into contact with and separate from the contacts of the fixed contact and is placed on the other end of the movable contact support; and the movable contact A movable contact holder is provided on the top of the movable contact holder, which is arranged parallel to the movable contact holder so as to be separated at both ends and in contact with the middle part, and whose both ends are biased by contact springs, respectively. The movable contact is separated from the retainer so that the contact of the movable contact can slide on the contact of the fixed contact.

[Example of idea]

Figures 1 to 6 are diagrams showing an embodiment of the bridging type contactor device according to this invention, and the same parts in the figures as the conventional device shown in Figure 8 described above are designated with the same reference numerals to correspond to the differences. Explain with emphasis on the points. The difference between this embodiment and the conventional device is that the movable contact 8
By giving flexibility to the movable contact 8 and interposing the movable contact presser 12 between the movable contact 8 and the contact spring 11, the movable contact can be used as a twin contact or a single contact regardless of the contact spring 11. The first point is that it pretends to be able to freely replace things.

Next, by bending both ends of the movable contactor downward, the movable contactor 9 and the movable contactor presser 12 are overlapped so that they are in contact with each other only at the middle part and are separated at both ends. The contact portions at both ends of the contact spring 11 are not directly subjected to the spring force of the contact spring 11. As a result, movable contact 1
0a, 10b and fixed contacts 3a, 3b, the movable contact part of the movable contact is not restrained by the contact spring and can be bent with a considerable degree of freedom. It becomes possible to slide on fixed contacts. For this purpose, first, in order to prevent the movable contact 9 and the movable contact holder 12 from being misaligned in their axes, the movable contact 9 and the movable contact holder 12 are
is provided with two cut-and-raised protrusions 9a along the axis on its top side, and the movable contact holder 12 is provided with through holes 12a into which the respective protrusions 9a are fitted. And a total of four movable contacts 13a, 13a' and 13b, 13, two at each end.
The fixed contact 14 having a twin contact configuration with b' is also formed in the same manner as the movable contact 9, and the movable contact holder 1
Two cut-and-raised protrusions 14a that fit into the two through holes 12a are provided. Therefore, the movable contact 14 can bend itself in the same way as the movable contact 9, so the fixed contact 4
It comes into sliding contact with a and 4b.

In this configuration, when the cam 7 rotates and the recess 7a of the cam 7 comes to the position of the roller 8, the contact support 5, the movable contact 9, and the movable contact presser 12 are moved by the spring force of the contact spring 11. are pressed down integrally, and the movable contacts 10a, 10b, 13a, 13a',
13b, 13b' begin to come into contact with the fixed contacts 3a, 3b, and since both ends of the movable contacts 9, 14 are free, they are bent by continued pressure, and the movable contacts slide on the fixed contacts. They make contact and the closure of both contacts is completed.

In this embodiment, the engagement between the through hole 12a of the movable contact holder 12 and the movable contacts 9 and 14 is as follows.
Although cut and raised projections 9a and 14a are used, it goes without saying that an extruded projection 15a may be provided on the movable contact 15 side as shown in FIG. 7 as another embodiment. Further, the movable contact and the movable contact holder may be coupled not only by such fitting coupling but also by welding or the like. By forming the movable contacts 9 and 14 from thin metal plates, they can be made flexible.

[Effect of idea]

According to this invention, by interposing a movable contact holder that moves together with the contact support between the contact support that holds the movable contact and the contact spring, sliding contact of the contact can be obtained. In addition to the effect of improving reliability, it is possible to change between a single contact and a double contact simply by replacing the movable contact, and it is also possible to easily obtain a bridging type contact device having a double contact configuration.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the bridge type contactor device according to this invention, and FIG. 1 is a longitudinal sectional view;
Figure 2 is a side view of the main part when the movable contact is a single contact.
Figure 3 is a side view of the main part when the movable contact is a double contact.
4 to 6 are perspective views of the main components, FIG. 7 is a perspective view of the main components of another embodiment of the bridge-type contact device according to this invention, and FIG. 8 is a perspective view of the main components of the conventional bridge-type contact device. It is a longitudinal cross-sectional view showing an example of a shaped contact device. 2a, 2b...terminal, 4a, 4b...fixed contact, 5...contact support, 9, 14...movable contact, 10a, 10b, 13a, 13a', 13b,
13b'...Movable contact.

Claims (1)

[Scope of utility model registration request] a pair of stationary contacts having extended terminals and facing each other at intervals, each having a contact point at an end;
a movable contact support disposed to be able to reciprocate between the fixed contacts in a direction orthogonal thereto and having one end connected to a drive mechanism; a flexible movable contact having two contacts and placed on the other end of the movable contact support; A bridge comprising: a movable contact holder disposed parallel to the movable contact holder, both ends of which are biased by contact springs, and both ends of the movable contact are separated from the movable contact holder. shaped contact device.