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A wooden crossbar on a door An aldrop latch, a form of draw bolt. A crossbar, sometimes called a bolt or draw bolt, is a historically common and simple means of barring a door. In its most primitive form it employs a plank or beam held by or placed onto open cleats on a door, which is shifted to be held fast by a corresponding cleat on an ...
Bolt – A (nearly always) metal shaft attached by cleats or a specific form of bracket, that slides into the jamb to fasten a door. Draw bolt - A form of crossbar latch where a bolt, held in place by metal bails, is slid to engage a bail fixed to a jamb or mating door. A small, typically knob, handle is affixed to the bolt to aid grip.
A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread. [1]
Appearance. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. Technical standards exist to provide ...
Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...
An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.
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