The shaft collar is a type of mechanical device is widely used, and is impiegto in almost all equipment. Many applications see the collars used independently, such as positioning unit, thrust or mechanical stops many times are used as components of mechanical units for the transmission of power in the engines.
The first collars products in series were used in the first factories in the transmission tree; being rigid collars with set screws protruding, were quite dangerous for the user. indeed not a few accidents caused by getting entangled in clothing of the worker and dragging it into machines. Fi were not big improvements until 1900, when the manufacturer of fasteners SPS Technologies patented the first collar with grub screws recessed head: not having protruding elements, was immediately considered “collar safe” and was soon adopted in the enterprise .
Conversely, this could function only in the case where the shaft on which the shaft collar is fixed is composed of a softer material of the collar itself: thus there may be only the necessary friction to ensure the holding power. This determines, in addition to substantial limitations of use, aesthetic and functional damage to the shaft.
The alternative is found only fifty years later, with the invention of the collars clamp: acting on the whole circumference of the tree, you do not cause damage and can be used with all the construction materials.
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