SU955255A1 - Microswitch - Google Patents

Description

(54) MICRO SWITCH

The invention relates to electrical engineering, namely to switching equipment.

Microswitches are known that contain an insulating base and a mechanism of instantaneous action, including a drive element and a contact spring formed by the 140STIC part and the lobe in its media | 1st part 013 and 21.

A disadvantage of lime devices is their low reliability, since the middle lobes of the contact spring do not allow contact segregation when they stick.

The purpose of the invention is to increase reliability.

For this purpose, in a microswitch containing an insulating base and an instantaneous mechanism, including a drive element and a contact spring with petals in its middle part, each petal of the contact spring has greater rigidity than its rest, and the base is made with supports for the petals .

Contact spring petals you-; polnevy with stiffeners.

The micro switch is provided with brackets fixed on the petals of the contact spring.

Figure 1 shows the microswitch in the initial (initial) position of the drive element (button) i in figure 2 - the same, in the neutral position; fig.Z - tozhe, in the position of a fully selected additional stroke; figure 4 - the same, in the position of the beginning of the forced. from the movable contact of the fixed; Figures 5 and b show primer rigging of the middle 15 lobes of the contact spring.

Claims (2)

 The microswitch consists of a contact spring formed by bridge part 1 and two middle lobes 2, which in the middle part of them are given greater flexural rigidity compared to the ostrich part, for example, by creating stiffeners by bending the edges at a 90 ° angle (Figure 5 ), by fitting onto the middle part along the petal length of the bracket 3 (Fig. 6) and in other ways. The ends of the middle lobes of the contact spring are fixed with the possibility of free swinging and stopping the plate 4 of the drive element (button) 5, for example, the spring is inserted by the middle part of the petal end with a protrusion into the aperture of the support plate, and with the ends of the tensioned surface rests on the stop plate what is the required contact pressure. At both ends of the bridge part, two movable contacts 6 and 7 are rigidly fixed, resting in the initial position on rigidly fixed on the insulating base in the housing, 8 fixed contacts 9 and 10, and after the direct actuation in fixed contacts 11 and 12. The flexible return The spring 13 is installed with a preload between the insulating body 8 and the step on the support plate 4. In the insulating base 8, supports 14 are made for toughened middle lobes. The device works in the following way. When an external force is applied to the drive element 5 of the microswitch, the latter moves along its axis, compresses the return spring 13 and by means of the stop plate 4 moves the bearing part of the middle lobes of the contact spring towards the neutral position of the instantaneous mechanism (Fig. only the neutral position is passed, the i4a ends of the contact spring give rise to the component forces directed to the transfer of moving contacts from one fixed to the other (FIG. 3) In the event that the moving contacts 6 and / or 7 adhere to the fixed contacts 9. and / or 10, respectively, during the further travel of the drive element (the full position of the direct operation), the middle toughened part of the petal is supported into the microswitch case at the point 14, which leads to the formation of a lever, and with further movement of the drive element to the forced retraction of the movable contact from the fixed one, there arises an additional force created by the lever, which contributes to the separation of the stuck contact, after kontaktnd spring which instantaneously throws the movable contact from one fixed contact to the other. The reliability of the proposed device is higher compared with limestone and. Invention 1. A micro switch containing an insulating base and an instantaneous mechanism, including a drive element and a contact spring with petals in its middle part / characterized in that, in order to increase reliability, each contact spring has a greater rigidity than its the remainder, and the insulating base is provided with supports for the said petals. 2. A microswitch according to claim 1, different in that the petals of the contact spring are made with stiffening ribs. 3. The microswitch according to claim 1, about t and h and yush and with the fact that it is equipped with brackets rigidly mounted on the petals of the contact spring. Sources of information: taken into account in the examination 1.US Patent 2429812, cl.200-67, 1947. 2. US Patent. 2801310, CL.200-67, 1957 (prototype). / f 4 5 Uf.