Safety circuit for flywheel masses or machine parts that are dri

Details Safety circuit for flywheel masses or machine parts that are dri Safety circuit for flywheel masses or machine parts that are dri

1990-10-17

1992-10-27

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

49 27, 49 29, 49 42, 318467, H01H 3500, E05F 1502, E05F 1518

Patent

active

051592037

ABSTRACT:
In safety circuits for braking or arresting devices (7) of flywheel masses or machine parts, especially a revolving door, which are driven by electric motor and can be switched on electrically, in which at least one of two edges moving toward each other is provided with a pressure-sensitive electrical switching member (3) for generating interference signals. Interference signals generated during a disturbance are sent to an electronic control unit (1) and are used, by an electronic switch (8), to switch off the drive motor (10) and/or to switch on a braking or arresting device (7). The movement of the part provided with the movable edge or element is stopped even when the electrical switch (8) of the control unit (1) does not respond correctly in the presence of an interference signal. The reliability of the safety circuit is continuously checked. An electronic switching unit (2), which interrupts the continuous excitation of a safety relay (4) having at least three relay contact switches (a, b, c) and at least one closing contact (a, b, or c), is connected before the electronic control unit (1). The relay contact switches (a, b, c) switch the circuits (9, 6) of the drive motor (10) and of the braking or arresting device (7), as well as a control circuit (11).

REFERENCES:
patent: 3678623 (1972-07-01), Jenkins
patent: 4289995 (1981-09-01), Sorber et al.
patent: 4534131 (1985-08-01), Blackston et al.
patent: 4627193 (1986-12-01), Schwarz

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