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Is a type of joint between parts, used to hold them together. takes advantage of their geometry. [5] That is, unlike friction fasteners, which rely on clamping force, form-fitting fasteners use, as stated, the shape of the parts themselves to prevent them from separating. Joints can be fixed, articulated or other types. [6] Examples: [7]
A figure-four is a catch wrestling term for a joint-lock that resembles the number "4". A keylock or toe hold can be referred to as a figure-four hold, when it involves a figure-four formation with the legs or arms. If the figure-four involves grabbing the wrists with both hands, it is called a double wrist lock; known as kimura in MMA
A security locknut [1] is a type of industrial fastener composed of two steel threaded parts: a nut body and an elliptical spring steel lock ring. Security locknuts are fastened onto a mating bolt to form a bolted joint. Forces of friction (with elastic deformation), a stretching of the bolt, and compression hold the bolted joint firmly together.
A heel hook is a leg lock affecting multiple joints, and is applied by transversely twisting the foot either medially or laterally. There are several variations of heel hooks, with the most typical being performed by placing the legs around a leg of an opponent and holding the opponent's foot in the armpit on the same side.
PVC, PE and TPV waterstops are made continuous for the length of the concrete joint by heat welding, using simple thermoplastic welding equipment. [1] PE and TPV waterstops are generally installed in joints of secondary containment structures to prevent the passage of hazardous fluids other than water such as fuel oils, acids, or process ...
Modern prison restraints including steel handcuffs and belly chains A full Medical Restraint System. Physical restraints are used: primarily by police and prison authorities to obstruct delinquents and prisoners from escaping or resisting [1] British Police officers are authorised to use leg and arm restraints, if they have been instructed in their use.
The first built-in locks often were of a simple screw-type, but soon developed into the "Darby" type. In Europe these continued to be used into the middle of the 20th century, whereas in the U.S. from the late 19th century onwards many new designs were invented and produced before handcuffs and leg irons of the Peerless type became the standard ...
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