SU907611A1 - Limit switch - Google Patents

Description

(54) END SWITCH

one

The invention relates to electrical engineering, namely to co-switching devices.

Known limit switch, comprising a housing, a drive shaft, on which a lever, a lead and a working spring, a driven shaft, on which movable contacts are placed, and an additional spring 1 are mounted.

Also known is a limit switch comprising a housing, an axle drive shaft on which a lever, a driver, an operating and additional spring are mounted, a driven shaft on which movable contacts and a bracket are placed, fixed contacts, an emphasis which is mounted on the housing with a fastening element and is covered by the ends additional spring 2.

Changing the triggering program of such limit switches requires a lot of time for restructuring and does not exclude the possibility of a broken seal between the housing and the base.

The purpose of the invention is to improve the operating conditions.

To achieve this goal, in the limit switch containing the housing.

a drive shaft on which a lever is mounted, a leash, a working and additional springs, a driven shaft on which movable contacts and a bracket are placed, fixed contacts, an emphasis that is mounted on the housing by means of a fastening element and enveloped by the ends of the additional spring, on the housing wall located on the side of the lever, a slot is made into which the said fastening element is inserted so that it can be moved therein, and the free end of the driver is gripped by the ends of the additional spring.

FIG. Figure 1 shows the limit switch with the cover removed; in fig. 2 - limit switch with base removed;

15 in FIG. 3 - limit switch, longitudinal section.

The switch consists of a housing 1, in which the drive shaft 2 is installed with a lever 3 with a roller. On the drive shaft, a driver 4 is installed with a spring-loaded pusher 5 interacting with one of two inclined surfaces in the switching process with a bracket 6 fixed on the driven shaft 7. At the other end of this shaft a contact lever 8 is fixed, in the windows of which there are moving contacts 9, which are spring-loaded, fixed contacts 10 are connected to screw terminals 11 for connecting wires.

To change the triggering program, there is a stop 12 mounted on the sleeve rotatably and fixed in the adjusted position by the fixing screw 13, passed through the housing slot and the threaded hole of the stop 12, for which the ends of the additional spring 14 are attached. At the same time, the ends of the free end of the leash 15 are covered, rigidly connected to the shaft. On the drive shaft installed working spring 16, the ends of which cover the protrusions 17 of the leash.

To operate the switch when the lever is deflected clockwise, the screw 13 is tightened in the slot in the extreme right position. When this stop 12 is offset from the longitudinal axis of the switch to the left (Fig. 2). The leash 4, together with the spring-loaded pusher 5, fixes the movable contacts 9 in the initial position for this program through the clamp 6.

To operate the switch when the lever 3 is tilted counterclockwise, loosen the screw 13 and, tilting the lever clockwise, tighten the screw to the leftmost position in the slot (Fig. 1). In this case, the lead 4, together with the spring-loaded pusher 5, switches and fixes, by means of the clamp 6, the movable contacts 9 in a different initial position for the restructured program.

The switch works as follows.

When the lever 3 is tilted clockwise (relative to the front side of the switch of Fig. 2), the force of the driver 15 is transmitted through the ends of the operating spring 16 to the protrusions 17 of the driver 4 (Fig. 3). In this case, the spring-loaded pusher 5, together with the leash 4, runs over the bracket 6 and moves with additional compression

springs. After reaching the bevel tip (the point of unstable equilibrium), the spring-loaded pusher 5 moves the bracket to another extreme position. At the same time, the contact lever 8 is instantly transferred, switching the contacts. The lead 4 abuts against the opposite wall of the housing 1.

Due to the working spring 16, the ends of which cover the leash 15 and the protrusions 17 of the leash 4, an additional stroke of the lever is possible when the force is applied to it after switching contacts. In this case, one of the ends of the operating spring 16 is held by the protrusion 17 of the driver 4, and the other end is cocked by a driver fixed on the shaft 15. The limitation of the angle of rotation of the driver 15 is determined by the length of the window of driver 4 (Fig. 2).

Claims (2)

1. US Patent No. 2806912, cl. 200-47, 1957. 2. US patent number 3097271, cl. 200-47, 1963.