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US 5,020,640 AGranted
Elevator brake
AssigneeBongers & Deimann
InventorJacob A. Nederbragt
Life of this patent
Estimating the term…
Abstract
In an elevator brake that includes brake jaws acting on at least one bearer rope and a device for applying the brake, the speed of the elevator car is monitored by an impulse relay. This relay is connected to a pulse generator that includes a roller driven by the bearer rope of the elevator car. If the speed of the elevator car is too high, a switching signal applying the brake is given before an arresting device responds.
Claims7
An elevator brake, comprising:
- brake jaws acting on at least one bearer rope;
- brake applying means;
- a safety switch that actuates the brake applying means, said safety switch being pulse count dependent and being actuated in a pulse circuit by a pulse generator responsive to a part of the elevator installation that moves dependent on the speed of the elevator car;
- and
- at least one time delayed, pulse count dependent monitoring switch connected in a series with said safety switch in a safety circuit and controlled through said pulse generator in said pulse circuit so as to actuate the brake applying means when the elevator car begins to move from a stopped position or is in motion when no command to move is present, and so as to monitor start-up of the elevator.
2 more elements
An elevator brake, comprising:
- brake jaws acting on at least one bearer rope;
- brake applying means;
- a safety switch that actuates the brake applying means, said safety switch being pulse count dependent and being actuated in a pulse circuit by a pulse generator responsive to a part of the elevator installation that moves dependent on the speed of the elevator car;
- at least one timed delayed, pulse count dependent monitoring switch connected in a series with said safety switch in a safety circuit and controlled through said pulse generator in said pulse circuit so as to actuate the brake applying means when the elevator car begins to move from a stopped position or is in motion when no command to move is present, and so as to monitor start-up of the elevator;
- a manual switch connected in parallel with at least one of said safety and monitoring switches;
- and
- a two-way switch located in the current supply circuit of said safety and monitoring switches.
4 more elements
Dependencies are inferred from the claim text.