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Another three-point locking system is commonly used in lockers. [5] This system uses a "Latch Channel" with 3 vertical slots that attach to 3 hooks on the locker frame. The locker handle is attached directly to the latch channel so that when the channel is lifted, it is released from the hooks and the door is allowed to swing open.
The three-point hitch (British English: three-point linkage) is a widely used type of hitch for attaching ploughs and other implements to an agricultural or industrial tractor. [ 1 ] [ 2 ] The three points resemble either a triangle, or the letter A.
Four point "belt and suspenders": An experimental design from Ford where the "suspenders" are attached to the backrest, not to the frame of the car. [81] 3-point Adjustable: Experimental safety belt from GWR Safety Systems that allowed the car Hiriko, designed by MIT, to fold without compromising the safety and comfort of the occupants. [82]
The term is most often used in items like lockers, where it is contrasted with the much more secure three-point locking, which uses movable rods to secure the top and bottom of the door when the door is locked, and the term is not normally used in situations where single-point locking is the only option normally found.
The locks can log the times of entry, and can trigger an alarm if they are struck during a break-in attempt. Deadbolts — unlike common spring latches , the locking mechanism of these typically prevents the bolt from being retracted by force, or shimming, and it cannot be moved to the open position except by rotating the key.
[2] [3]: 23–24 In 1868, Saxby (of Saxby & Farmer) [4] was awarded a patent for what is known today in North America as “preliminary latch locking”. [5] [6] Preliminary latch locking became so successful that by 1873, 13,000 mechanical locking levers were employed on the London and North Western Railway alone. [6] [7]
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