Method and mechanism for releasing hydraulic elevator brakes

Abstract

The present invention provides a method and mechanism for releasing a hydraulically actuated elevator braking system (70). The brake release mechanism includes a rotary pump (2), a crank handle (4, 45) for manually turning the rotary pump (2), a fluid supply port (30), a fluid return port (32), for connection to the brake system ( The output port (34) of the cylinder (72) of 70), and the cylinder with the inflow port (12) connected to the fluid supply port (30) via the rotary pump (2), can be selectively connected to the output port (34) port (14) and the quick discharge valve (10) connected to the discharge port (16) of the fluid return port (32). By turning the rotary pump (2), for example using the crank handle (4), a continuous flow of pressurized hydraulic fluid is delivered through the quick discharge valve (10) to the brake cylinder (72), thereby releasing the hydraulic brake system (70).

Description

technical field [0001] The present disclosure relates to elevators, and more particularly to a method and mechanism for releasing a hydraulically actuated elevator braking system installed in an elevator drive in conjunction with an elevator motor. While the mechanism may be provided pre-assembled with the brake system and motor as a drive for newly designed equipment, it is conceivable that the mechanism may also be used for retrofit or retrofit of existing equipment. Background technique [0002] Typically, in traction elevators, drum brakes or disc brakes are provided to halt the rotation of the motor. In either case, at least one compression spring is typically employed to bias the brake to its closed or braking position, and an actuator, usually electromagnetically driven, hydraulically driven or pneumatically driven, is provided to overcome this spring bias and move the brake to its open or released position, allowing the motor to begin rotating and thus raising or lo...

AI Technical Summary

Problems solved by technology

However, not only does the operator need to manually and repeatedly operate the piston pump, he must also simultaneously manipulate the valve to prevent the hydraulic fluid from draining directly back into the reservoir

This is a difficult or nearly impossible task, and the operator is prone to mechanically jamming the valve in its closed position

However, such a situation could cause the brakes to remain open uncontrollably and possibly lead to an accident

Furthermore, although intermittent flow from a piston pump is extremely effective for gradually lowering or raising an elevator car to evacuate passengers at the closest landing point, these systems are not effective during commissioning (e.g. when it is necessary to keep the brakes released for during an extended period to test the effectiveness of the car-mounted safety gear) cannot be used

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