Two car elevator system
AssigneeOtis Elevator Company
InventorJohn K. Salmon
Life of this patent
Estimating the term…
Abstract
An elevator is provided comprising a first car, a second car, and a counterweight for travel within a hoistway. A plurality of ropes connect the first and second cars to the counterweight for travel within the hoistway. A machine is provided for driving the cars and counterweight within the hoistway. The plurality of ropes are arranged to cause the second car to travel 1/N of the distance, at 1/N of the speed, of the first car when the machine is driving the cars.
Claims19
An elevator, comprising:
- a hoistway;
- a first car, for travel within said hoistway;
- a second car, for travel within said hoistway;
- a counterweight, for travel within said hoistway;
- a plurality of ropes, connecting said first and second cars to said counterweight;
- and
- a machine, for driving said cars within said hoistway;
- wherein said plurality of ropes are arranged to cause said second car to travel (1/N of) the distance, at (1/N of) speed, of said first car when said machine is driving said cars.
An elevator, comprising:
- a hoistway;
- a car, for travel within said hoistway;
- a weighted vehicle, for travel within said hoistway;
- a counterweight, for travel within said hoistway;
- a plurality of ropes, connecting said car and said vehicle to said counterweight;
- and
- a machine, for driving said car and said vehicle within said hoistway;
- wherein said plurality of ropes are arranged to cause said vehicle to travel (1/N of) the distance, at (1/N of) the speed, of said first car when said machine is driving said vehicle and said car;
- wherein said vehicle acts against the inertia of said car in the event said counterweight is stopped traveling in a downward direction.
A method for reducing car jump in an elevator, comprising the steps of:
- providing a car and a counterweight for travel in a hoistway;
- providing a first plurality of ropes for connecting said car and counterweight, wherein said first plurality of ropes extend between said car and counterweight in a 1:1 roping arrangement;
- providing a weighted vehicle for travel in the hoistway below the car, said vehicle including a deflector sheave attached to said vehicle;
- providing a second plurality of ropes;
- attaching one end of said second plurality of ropes to said car;
- routing said second plurality of ropes down said hoistway from said car, to and around said deflector sheave, and back up said hoistway;
- attaching an other end of said second plurality of ropes to a fixed position in said hoistway;
- wherein said routing of said second plurality of ropes causes said vehicle to travel half the distance, at half the speed, of said car;
- and
- wherein said vehicle acts against the inertia of said car in the event said counterweight is stopped traveling in a downward direction.
A method to operate an elevator system having a pair of elevator cars in a single hoistway, the cars being driven by a single drive means and being roped together in an arrangement providing for conjoined movement of the pair of cars through the hoistway, the roping arrangement including a compensator that is adjustable in length, the hoistway having a plurality of landings, the method comprising the steps of:
- moving the pair of cars through the hoistway until one of the pair of cars is level with a desired landing;
- and
- leveling the other of the pair of cars with a second desired landing by adjusting the length of the compensator.
Dependencies are inferred from the claim text.