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A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]
Doors with these hinges may be called haar-hung doors. Self-closing hinge This is a spring-loaded hinge with a speed control function. The same as spring hinge, usually use spring to provide force to close the door and provide a mechanical or hydraulic damper to control door close speed. That can prevent door slamming problem while auto closes ...
Door closers at this time were known as a door spring and check. Later these two devices were combined into one unit that both closed the door and slowed the speed at which this was done. These early "door closers" used a pneumatic piston to check the speed, later models used a hydraulic or oil filled device for the same effect.
Door opener - Automatic door opening device activated by motion sensors or pressure pads; Door damper – A hydraulic device employed to slow the door's closure; Door knocker; Door stop – used to prevent the door from opening too far or striking another object [3] Espagnolette (for a window) Fingerplate; Letter box or mail slot; Peephole ...
Hydraulic breaching utilizes a hydraulic system to force the door open. These systems include hydraulic rescue tools (of the type used to extract people entrapped in vehicle wreckages) as well as specialized tools made specifically for door breaching. [3] The hydraulic device may be powered manually, pneumatically, or electrically. [16] [17 ...
A spreader is a hydraulic tool that is designed with two arms that come together in a narrow tip, and that uses hydraulic pressure to separate or spread the arms. The tip of the tool can be inserted into a narrow gap between two vehicle panels (such as between two doors, or between a door and a fender), then operated to create or widen an opening.
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