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Wall-mounted electromagnetic door holder securing a door in the open position An electromagnetic door holder ( electromagnetic door holder and release or hold-open device , sometimes informally called a mag hold open or electric doorstop ) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until ...
A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
A spring applies force to close the door, which the dashpot offsets by forcing fluid to flow through an orifice, often adjustable, between reservoirs, which slows the motion of the door. Consumer electronics often use dashpots where it is undesirable for a media access door or control panel to suddenly pop open when the door latch is released ...
Fail-safe locking devices are unlocked when de-energized. Direct pull electromagnetic locks are inherently fail-safe. Typically the electromagnet portion of the lock is attached to the door frame and a mating armature plate is attached to the door. The two components are in contact when the door is closed.
An electric strike is an access control device used for door frames. It replaces the fixed strike faceplate often used with a latch (also known as a keeper). Like a fixed strike plate, it normally presents a ramped or beveled surface to the locking latch allowing the door to close and latch just like a fixed strike would.
Compliant plier mechanism. In mechanical engineering, a compliant mechanism is a flexible mechanism that achieves force and motion transmission through elastic body deformation.
Chamberlain's "myQ" technology is embedded in garage door openers and lights, [5] can be added to Wi-Fi networks to control these devices and is being incorporated into future home products, all through a monthly subscription. [6]
The development of a linear cam is similar to, but not identical to, that of a rotating cam. [17] Key duplicating machine. The original key (mounted in the left-hand holder) acts as a linear cam to control the cut depth for the duplicate. A common example of a linear cam is a key for a pin tumbler lock. The pins act as followers.