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US 4,662,481 AGranted
Elevator system
AssigneeWestinghouse Electric Corp.
InventorsKim E. Morris, Michael F. Bush
Life of this patent
Estimating the term…
Abstract
An elevator system having a car mounted governor which includes a rotatable portion biased against a guide rail, and a fixed portion. The governor is pivoted from an operating position in which the rotatable portion rotates in response to car movement, to an operated position, in response to the locking of the rotatable portion to the fixed portion by predetermined car speed in the down travel direction. Movement of the governor to the operated position actuates a car safety via a suitable link.
Claims9
An elevator system, comprising:
- an elevator car,
- means including guide rails for mounting said elevator car for guided vertical movement in the up and down travel directions,
- a car safety carried by said elevator car,
- said car safety being actuatable to engage said guide rails and stop said elevator car,
- a governor carried by said elevator car,
- said governor having rotatable and fixed concentric, nested cylinders,
- said rotatable cylinder including a wheel portion adapted to engage a guide rail,
- biasing means operable between first and second positions,
- said biasing means biasing the wheel portion of said rotatable cylinder against a guide rail in both of said first and second positions,
- said biasing means normally being in said first position, in which said rotatable cylinder rotates with car movement,
- cooperable means on said rotatable and fixed cylinders for locking the rotatable cylinder and its associated wheel portion to the fixed cylinder at a predetermined car speed in the down travel direction, whereby friction between the wheel portion, when locked, and the associated guide rail, operates said biasing means to said second position,
- and means responsive to movement of said biasing means to said second position for actuating said car safety.
9 more elements
An elevator system, comprising:
- an elevator car,
- means including guide rails for mounting said elevator car for guided vertical movement in the up and down travel directions,
- motive means for said elevator car,
- a car safety carried by said elevator car,
- said car safety being actuatable to engage said guide rails and stop said elevator car,
- a governor carried by said elevator car,
- said governor having rotatable and fixed concentric, hollow, nested cylinders, each having a closed end,
- said rotatable cylinder including a wheel portion which frictionally engages a guide rail,
- said fixed cylinder having ratchet teeth,
- biasing means pivotable between operating and operated positions, said biasing means biasing the wheel portion of said rotatable cylinder against a guide rail, in both said operating and operated positions, with said biasing means normally being in said operating position in which the rotatable cylinder rotates with car movement,
- centrifugal means carried by said rotatable cylinder for engaging ratchet teeth of said fixed cylinder and locking the rotatable cylinder and its associated wheel portion to the fixed cylinder at a predetermined car speed in the down travel direction, whereby friction between the wheel portion, when locked, and the associated guide rail, pivots said biasing means from the operating to the operated positions,
- and means responsive to movement of said biasing means to the operated position for actuating said car safety.
9 more elements
Dependencies are inferred from the claim text.