In this case, Otis is derived from the personal names Ote or Ode which were medieval English equivalents for the German name Otto formally known as Audo or Odo. By the 19th century Americans were using the name Otis in honor of James Otisa leading Patriot whose fiery arguments and orations against the English Parliament contributed to the build-up to the Revolutionary War he is credited with the catch-phrase: James Otis was also noted for his progressive position on racial equality and believed that fundamental freedoms concerning life, liberty and property ought to be extended to African-Americans.
By Mary Bellis Primitive elevators were in use as early as the 3rd century BC, operated by human, animal, or water wheel power. From about the middle of the 19th century, power elevators, often steam-operated, were used for conveying materials in factories, mines, and warehouses.
InAmerican inventor Elisha Otis demonstrated a freight elevator equipped with a safety device to prevent falling in case Elisha otis supporting cable should break.
This increased public confidence in such devices. Otis established a company for manufacturing elevators and patented a steam elevator. InSir William Armstrong introduced the hydraulic crane, and in the early s, hydraulic machines began to replace the steam-powered elevator.
The hydraulic elevator is supported by a heavy piston, moving in a cylinder, and operated by the water or oil pressure produced by pumps. Electric elevators came into to use toward the end of the 19th century. The first one was built by the German inventor Werner von Siemens in How Elevators Work In a typical elevator, the car is raised and lowered by six to eight motor-driven wire ropes that are attached to the top of the car at one end, travel around a pair of sheaves, and are again attached to a counterweight at the other end.
The counterweight adds accelerating force when the elevator car is ascending and provides a retarding effort when the car is descending so that less motor horsepower is required. A set of chains are looped from the bottom of the counterweight to the underside of the car to help maintain balance by offsetting the weight of the suspension ropes.
Guide rails that run the length of the shaft keep the car and counterweight from swaying or twisting during their travel. Rollers are attached to the car and the counterweight to provide smooth travel along the guide rails.
The traction to raise and lower the car comes from the friction of the wire ropes against the grooved sheaves. The main sheave is driven by an electric motor. Most elevators use a direct current motor because its speed can be precisely controlled to allow smooth acceleration and deceleration.
Motor-generator M-G sets typically provide to dc power for the drive motor. Newer systems use a static drive control. The elevator controls vary the motor's speed based on a set of feedback signals that indicate the car's position in the shaftway. As the car approaches its destination, a switch near the landing signals the controls to stop the car at floor level.
Additional shaftway limit switches are installed to monitor overtravel conditions.The breaks were two wagon springs, which forced two latches into ratchets on the side of the shaft.
Elisha Otis's newly improved elevator allowed expansion to go up instead of out. Posts about Ned Beatty as Otis written by symonsez.
Yet, he still had to wait. It was three years before a high profile customer emerged when a New York department store thought it would take a chance and install an Otis Elevator to take passengers up and down 5 floors at a speed of 40 feet per minute.
Otis was founded in Yonkers, New York in by Elisha Otis. It was acquired by United Technologies in and is a wholly owned subsidiary. Otis has more than 64, employees, with revenue of US$ billion.
The company headquarters are located in Farmington, Connecticut.. Otis has also dabbled in horizontal automated people-mover "shuttle" systems, such as the Otis .
() Otis Elevator Co. Overview. Elisha Graves Otis designed and built the first hoisting device that proved safe enough to carry people. A self-trained mechanic and constant tinker, he founded the company that still bears his name in Elisha Graves Otis invented the first safe elevator system and in founded what is still the world's largest and best-known elevator manufacturing company.
He grew up on a farm in Vermont, and after a few failed business ventures Otis moved to New York in He worked as a master mechanic in. Elisha Otis is not a household name; he was never a celebrity either. However, his invention of an elevator brake would change to world a business and architecture forever.