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By 1992, IronMind had moved all design and production of its grippers in-house. [14] The next generation of the Silver Crush Grippers, released in 1993, marked the next major step in gripper evolution; their stainless-steel handles replaced the previous chrome-plated mild steel handles, and a new assembly technique eliminated the drift pin central to the design of the older grippers. [15]
Modern reconstruction of a torsion springald, the twisted skeins powering the inward projecting bow arms can be seen. Displayed at the Tower of London. Several reconstructed examples can be found, Jean Leibell produced a 12-inch (30.5 cm) model for his researches into "Springalds and Great Crossbows" which was commissioned by the Royal Armouries Museum, and a larger model can be seen at the ...
This is a striking clock which sounds the hours on a chime; one of the springs powers the timekeeping gear train while the other powers the striking train. A mainspring is a spiral torsion spring of metal ribbon—commonly spring steel—used as a power source in mechanical watches, some clocks, and other clockwork mechanisms.
The torsion constant or torsion coefficient is a geometrical property of a bar's cross-section. It is involved in the relationship between angle of twist and applied torque along the axis of the bar, for a homogeneous linear elastic bar. The torsion constant, together with material properties and length, describes a bar's torsional stiffness.
Torsion-spring hand grippers date back at least as far as the beginning of the 20th century. In 1964, IronMind introduced heavy duty grippers which are now known as 'Captains of Crush'. By 2004, there were five models in increasing difficulty to close (The Trainer, No. 1, No. 2, No. 3 and No. 4) and the selected gripper was the No.3.
In physics, Hooke's law is an empirical law which states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring.
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