Otis Elevator Company

Rajendra V Mistry

Louis Bialy

Mukunda B Pramanik

Sib S Ray

John Hornyack

An elevator hydraulic tank is provided with shaped sides which increase the rigidity and heat dissipating ability of the tank. The shaped sides of the tank may be corrugated. A hydraulic machine is mounted on the underside of the tank lid so that maintenance of the machine does not require draining of the tank. The shaped sides are enclosed by an outer shell which further minimizes noise emanating from the tank.

Hydraulic elevator oil tank

A bidirectional overspeed device is provided for an elevator system having an elevator car for travel within a hoistway along a guiderail. The elevator includes a governor rope running from a governor sheave at the top of the hoistway to a tension sheave at the bottom of the hoistway, and a bidirectional overspeed device. The bidirectional overspeed device comprises a bidirectional governor, a first safety brake, a second safety brake and a bidirectional linkage apparatus. In the event of an overspeed condition in either direction, the bidirectional governor clutches the governor rope, thereby operating the bidirectional linkage apparatus which connects the governor rope to the safety. Depending on the direction of the car travel, the linkage apparatus is either pulled upward or downward. Consequently, either the first or second safety is engaged and the elevator car is stopped.

Mechanical overspeed safety device

A mechanism is placed between a plunger and an elevator car to damp the effects of stick-slip encountered during elevator start-up and to minimize the probability of damage to a plunger/cylinder assembly if the elevator car is stopped in an emergency. The mechanism comprises a self-leveling hydraulic shock absorber that operates independently of any stick-slip between the plunger and cylinder.

Growing community of inventors

Farmington, CT, United States of America

Rajendra V Mistry