Auxiliary drive for a progressive safety gear device

Abstract

Disclosed is an auxiliary drive (1) for actuating an elevator brake (31), said drive comprising at least one friction body (10) that can be placed against a braking strip (17), a pivoting body, on which the friction body (10) is displaceably held relative to said pivoting body and pivotably held together with the pivoting body about a primary axis (2) lying outside the friction body (10), a springelement (6) and at least one electromagnet (15), in addition to a transmission member (22, 23) for transmitting a pivoting motion of the pivoting body to an elevator brake (31). The friction body (10) can be transferred from its operational-ready position on the pivoting body into its operating position on the pivoting body, and vice versa, when the spring element (6) is relaxed or compressed andthe at least one electromagnet (15), in its first switched mode, holds the friction body (10) in its operational-ready position on the pivoting body and, in its second switched mode, releases the body such that said friction body (10) can be moved away from the at least one electromagnet (15) with the action of the spring element (6), into its operational-ready position on the pivoting body and can be brought into frictional contact with said braking strip (17). In the second switched state, there is an air gap between the electromagnet and a component attracted by the electromagnet, and thefriction body (10), the pivoting body, the primary axis (2) and the braking strip (17) are arranged relative to one another such that the friction body (10) pivots the pivoting body, as a result of the frictional forces acting on the latter, about the primary axis (2) and closer to the braking strip (17) such that the friction body (10) is pushed back again from the braking strip (17) into a position on the pivoting body which is closer to its operational-ready position than its operating position, or which corresponds to its operating position, thereby reducing or eliminating the air gap across which the electromagnet must attract the assigned end of the rocker lever.

Description

Technical field [0001] The present invention relates to a new type of auxiliary drive device for a speed limiter according to the preamble of claim 1, and an elevator equipped with the auxiliary drive device and applications that are currently only mentioned in the specification. Background technique [0002] The elevator speed limiter has the following function, that is, it discovers the unacceptable elevator car driving state and then activates the braking device or brake safety device, which in most cases enforces the elevator car braking once it is triggered. This type of braking usually results in a stop. Hereinafter, the term "elevator braking device" is generally used for the following facts, which preferably refers to the "brake safety device" on the car and / or counterweight, but it can also refer to the "brake device" in a broad sense, unless otherwise There is said. [0003] Overspeed governors in the form of continuous wire rope loops have long been used. The wire rop...

AI Technical Summary

Problems solved by technology

[0011] The auxiliary drive is quite complex and potentially prone to failure

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