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This is an accepted version of this page This is the latest accepted revision, reviewed on 21 January 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
A machine tool may have several spindles, such as the headstock and tailstock spindles on a bench lathe. The main spindle is usually the biggest one. References to "the spindle" without further qualification imply the main spindle. Some machine tools that specialize in high-volume mass production have a group of 4, 6, or even more main spindles.
The material of the handle itself contributes to the growth of bacteria, with most door handles being constructed of stainless steel – a suitable home for bacteria. The material can affect the time bacteria can survive on door handles, but more important is the temperature and humidity of the environment.
A revolving door has three or four doors that hang on a center shaft and rotate around a vertical axis within a round enclosure. In high-rise buildings, regular doors are hard to open because of air pressure differentials. In order to address this problem, the revolving door was invented in 1888 by Theophilus Van Kannel of Philadelphia ...
Vent windows were installed on all doors, separate from the side windows, and could be opened or closed electrically. [32] The front and rear door latches were electromagnetic and installed on the Crown Eight successor, the Century. Unlike a conventional door handle, the door latch would release by touching the interior switch. [33]
Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another.
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