Procedure and apparatus for triggering the safety gear of an elevator
AssigneeKone Corporation
InventorHelge Korhonen
Life of this patent
Estimating the term…
Abstract
A procedure and an apparatus triggers the safety gear of an elevator at a speed lower than the gripping speed. The overspeed governor of the elevator comprises a pulley (3) driven by the safety gear rope and a brake (5) connected to it by knuckle pins (14,14'). The brake is provided with centrifugal weights (16,16'). Eccentric cams (15,15') and a brake disc (6) are also provided for the overspeed governor. At a speed lower than the gripping speed, using a separately controlled solenoid (30) attached to the overspeed governor, the brake (5) is caused to engage the pulley (3) by driving the plunger of the solenoid into the path of rubber rollers (31,32) rotating with the centrifugal weights.
Claims19
A method for triggering a safety gear at a speed lower than a gripping speed in an elevator in which the triggering of the safety gear in an overspeed situation is effected by a rope driving an overspeed governor via a rope pulley in such a manner that centrifugal weights in the overspeed governor assume an orbit outside an orbit corresponding to a set gripping speed when in the overspeed situation, coupling elements moving a brake of the overspeed governor to frictionally engage the rope pulley when the centrifugal weights move to the orbit outside the set gripping speed orbit, the safety gear of the elevator being triggered when the brake engages the rope pulley to brake the rope driving the pulley, the method for triggering the safety gear at a speed lower than the overspeed comprising the steps of:
- providing an obstruction device adjacent the brake, the obstruction device having an obstruction;
- moving the obstruction into engagement with a portion of the coupling elements to thereby activate the brake regardless of the speed of the elevator, the portion of the coupling elements engaged by the obstruction or the obstruction being elastic;
- dampening impact between the coupling elements and the obstruction due to use of elastic.
A method for triggering a safety gear at a speed lower than a gripping speed in an elevator in which the triggering of the safety gear in an overspeed situation is effected by a rope driving an overspeed governor via a rope pulley in such a manner that centrifugal weights in the overspeed governor assume an orbit outside an orbit corresponding to a set gripping speed when in the overspeed situation, coupling elements moving a brake of the overspeed governor to frictionally engage the rope pulley when the centrifugal weights move to the orbit outside the set gripping speed orbit, the safety gear of the elevator being triggered when the brake engages the rope pulley to brake the rope driving the pulley, the rope pulley being rotatable about a shaft and the coupling elements being mounted on the rope pulley and being rotatable therewith, the method for triggering the safety gear at a speed lower than the overspeed comprising the steps of:
- providing an obstruction device adjacent the brake, the obstruction device having an obstruction;
- moving the obstruction into engagement with a portion of the coupling elements to thereby activate the brake regardless of the speed of the elevator;
- deflecting at least one of the coupling elements to move away from the shaft when the obstruction is moved into engagement with the portion of the coupling elements;
- and
- activating a switch to turn off operating current to the elevator when the at least one of the coupling elements is deflected, the switch being engaged by one of the coupling elements when being activated.
An apparatus for triggering a safety gear at a speed lower than a gripping speed in an elevator in which the triggering of the safety gear in an overspeed situation is effected by a rope driving an overspeed governor via a rope pulley in such a manner that centrifugal weights in the overspeed governor assume an orbit outside an orbit corresponding to a set gripping speed when in the overspeed situation, coupling elements moving a brake of the overspeed governor to frictionally engage the rope pulley when the centrifugal weights move to the orbit outside the set gripping speed orbit, the safety gear of the elevator being triggered when the brake engages the rope pulley to brake the rope driving the pulley, the apparatus for triggering the safety gear at a speed lower than the overspeed comprising an obstruction device with an obstruction movable into engagement with a portion of the coupling elements to thereby activate the brake regardless of the speed of the elevator, the portion of the coupling elements engaged by the obstruction or the obstruction being elastic to dampen impact between the coupling elements and the obstruction.
Dependencies are inferred from the claim text.