There is no certain on who invented the clamp collar, but Ruland Manufacturing already provided these components for pointing devices and driving tools of war during World War II.
These tools, mechanical, exquisitely composed of precision gearboxes, differentials, couplings and collars, combined with electric motors, angular displacement transducers, potentiometers, precision electronic components.
At that time were considered highly technological devices to hold in utmost secrecy, and were forerunners of the analog computer. If nowadays are considered common elements, at that time the clamp collars, along with other items, were State-of-the-art precision components and critical use.
Clamp collar solves many security problems and typical use of the old rigid ring collars. These collars are used cheesehead screws Hexagon to exercise the necessary compressive force to close the collar on the shaft.
The absence of locking pins in this type of collar produces a result not to damage the shaft. The collar are, therefore, easier to remove and infinitely adjustable. In addition, the performance of collars are optimal on all types of tree: because the sealing power is not related to the pressure of the screw shaft material no longer has much influence on the performance of the collar.
When serra clamp screw, the collar is pressed against the shaft with an almost uniform distribution of forces on the circumference of the same, rather than creating a concentration of force only on two opposite points (as in collars with locking pins). It produces a force almost sealing dop-pia than traditional collars, depending on the size and status of the tree.
Although seemingly simple components, clamp collars fulfil basic functions in any equipment. Because the clamp collar guarantee good performance, requires the presence of some elements, which importance increases depending on application mode of the collar.
If in certain applications the sealing power of collar is paramount, others may be even more important factors such as accuracy of the collar on the bore surface, inertia, conductivity, weldability and corrosion resistance.
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