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A garage door with a broken spring or the wrong strength can fall. Because the effective mass of the door increases as the garage door sections transfer from the horizontal to vertical door tracks, a falling garage door accelerates rapidly. A free-falling garage door can cause severe injury or death.
In May 1954, the Alliance Manufacturing Company first produced its own garage door opener and called it Genie. [2] In 1983 the company entered the home and shop vacuum market, and in 1985 it changed its name to Genie Home Products. [2] Overhead Door Corporation purchased the company in 1994. [2] The Genie Company is headquartered in Mt. Hope ...
Mechanical breaching can be used to defeat the latch, lock, hinges, or door itself and methods can vary from minimally destructive to very destructive. Lockpicking with traditional lock picks is a minimally destructive method but is relatively slow and requires a trained operator.
A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted ...
This is exactly the same principle as a child safety door lock which is installed on car doors. Electric strikes on AC allow someone outside the door to hear when the door is open. The buzzing noise is typically made by applying alternating current (AC) to the strike instead of direct current (DC). When using a DC powered strike, the sound is ...
Six men fell out of a mine-shaft elevator due to a broken control switch. [29] Mogok Township. Myanmar: 6 0 2019-03-09 A construction elevator fell from the 15th floor. [30] Karachi, Pakistan: 5 12+ 1957-03-20 A construction elevator carrying 21 people plunged five floors when the cable broke. [31] [32] Jacksonville, Florida, U.S. 5 0 1999-09-07
Gondola lift at the Ylläs ski resort in Lapland, Finland. In some systems the passenger cabins, which can hold between two and fifteen people, [4] are connected to the cable by means of spring–loaded grips. These grips allow the cabin to be detached from the moving cable and slowed in the terminals, to allow passengers to board and disembark.
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