Elevator Door Closing Mechanism

As improvements were made electronic eyes came along working similar to those on garage doors.

Elevator door closing mechanism.

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. 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. Alexander miles of duluth minnesota patented an electric elevator on october 11 1887. The computer turns the motor to open the doors when the car arrives at a floor and close the doors before the car starts moving again.

Safety controls for elevator door closing mechanism filed june 15 1955 2 sheets sheet 1 inventor. 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. The car doors have a clutch mechanism that unlocks the outer doors at each floor and pulls them open. Many elevators have a motion sensor system that keeps the doors from closing if somebody is between them.

Safety controls for elevator door closing mechanism filed june 15 1955 2 sheets sheet 2 hatchway 000. 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. 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. His innovation in the mechanism to open and close elevator doors greatly improved elevator safety.

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. 59 as 85 a7 o as l 7 1z7 inventor jose ph h burden att ivey united states. 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.

How the doors operate.