Elevator Door Closing Mechanism

Alexander miles of duluth minnesota patented an electric elevator on october 11 1887.

Elevator door closing mechanism.

59 as 85 a7 o as l 7 1z7 inventor jose ph h burden att ivey united states. As improvements were made electronic eyes came along working similar to those on garage doors. However most action in the door s operation is mechanical. Elevators are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist although some pump hydraulic fluid to raise a.

E force necessary to prevent closing of the hoistway door or the car door or gate if power operated om rest shall not exceed 135 n. Miles is notable for being a black inventor and successful businessperson in 19th century america. The initial solution for an elevator car closing on limbs was a bumper edge that sensed when it came into contact with something solid and automatically reopened the door. Of course there is an electric impulse from the elevator controller the brain of the elevator that causes an elevator door to open and close when the car is safely at the proper floor.

An elevator door mechanism that has a rotating shaft a reversible driving means to turn the shaft a linear drive actuator riding on and moving along the shaft a resilient isolated pillow block mounted on spacers at each end of the shaft to dampen the noise of operation two elevator doors attached to the linear drive actuator and a switching means attached adjacent to one end of the. Closing mechanism shall be designed and installed to conform to 2 13 4 2 and the reopening device shall be designed and installed to conform to 2 13 5. G i joseph h burden i by march 11 1958 j. Safety controls for elevator door closing mechanism filed june 15 1955 2 sheets sheet 2 hatchway 000.

His innovation in the mechanism to open and close elevator doors greatly improved elevator safety. Many elevators have a motion sensor system that keeps the doors from closing if somebody is between them. The car doors have a clutch mechanism that unlocks the outer doors at each floor and pulls them open. An elevator north american english or lift commonwealth english is a type of vertical cable transportation machine that moves people or freight between floors levels or decks of a building vessel or other structure.

Safety controls for elevator door closing mechanism filed june 15 1955 2 sheets sheet 1 inventor.