Method for braking a traction sheave elevator, and traction sheave elevator
AssigneeKone Corporation
InventorsJohannes de Jong, Esko Aulanko, Ilkka Lempiö
Life of this patent
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Abstract
A method and apparatus for braking a tractor sheave elevator. In an emergency situation, the elevator braking is complimented by using a second braking device not connected to the traction sheave. A secondary braking can be accomplished by applying a braking force to the elevator ropes or guide rail. If the secondary brake is applied first, the ropes will not slip on the traction sheave when the primary brake is applied. Alternatively, slippage may be allowed to occur in order to distribute the heat produced by braking.
Claims13
A method for braking a traction sheave elevator comprising a drive machine including a traction sheave, hoisting ropes driven by the traction sheave and an elevator car and counterweight suspended on the hoisting ropes, the method comprising the steps of:
- providing a first braking device adjacent the drive machine and operable on the traction sheave;
- providing a second braking device separate from the first braking device, the second braking device always being out of contact with the traction sheave;
- starting braking of the elevator by the second braking device during an emergency stop function;
- and
- starting braking of the elevator by the first braking device after the starting of braking by the second braking device during an emergency stop function, said second braking device being selectively closed so as to be operable as a normal brake.
A traction sheave elevator comprising:
- a drive machine including a traction sheave, the traction sheave having rope grooves;
- hoisting ropes driven by the traction sheave, the hoisting ropes being received in the rope grooves;
- an elevator car suspended on the hoisting ropes;
- a first braking device operable on the traction sheave;
- a second braking device separate from the first braking device, the second braking device always being out of contact with the traction sheave, said second braking device being selectively closed so as to be operable as a normal brake the second braking device braking the elevator before the first braking device brakes the elevator during an emergency stop function.
A method for braking a traction sheave elevator comprising a drive machine including a traction sheave, hoisting ropes driven by the traction sheave and an elevator car and counterweight suspended on the hoisting ropes, the method comprising the steps of:
- providing a first braking device adjacent the drive machine and operable on the traction sheave;
- providing a second braking device separate from the first braking device, the second braking device always being out of contact with the traction sheave;
- and
- stopping the elevator with the second braking device while the ropes are slipping in rope grooves of the traction sheave.
A traction sheave elevator comprising:
- a drive machine including a traction sheave, the traction sheave having rope grooves;
- hoisting ropes driven by the traction sheave, the hoisting ropes being received in the rope grooves;
- an elevator car suspended on the hoisting ropes;
- a first braking device operable on the traction sheave;
- a second braking device separate from the first braking device, the second braking device always being out of contact with the traction sheave, said second braking device being selectively closed so as to be operable as a normal brake, wherein the elevator is stopped with the second braking device while the hoisting ropes are slipping in the rope grooves of the traction sheave.
Dependencies are inferred from the claim text.