Safety Clutch

Safety Clutch

 

a coupling that disconnects two shafts or a shaft and a component fitted to it when there is an excessive increase in the torque transmitted (an overload) or in the speed of rotation; that is, it protects a machine from breakage when the normal operating conditions are exceeded.

Safety clutches are classified as torque-limiting, which have breakable elements, usually shear pins, that can be replaced after the clutch disengages; dog, ball, and other clutches that are kept engaged by springs until the torque increases to the point of overcoming the spring forces; and friction clutches, in which pressure is created between frictional surfaces by springs adjusted to transmit the maximum permissible torque. The function of protecting machines from overloads is often performed by other types of clutches, such as hydrodynamic clutches. Safety clutches that limit the speed of rotation are usually of the centrifugal type.

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References in periodicals archive ?
The modular assembly allows many designs-for example, with a hollow shaft, with a flexible coupling, with an additional safety clutch for torque limiting, or with two individual brakes.
The Alliance partners have used it to develop a safety clutch for machinery - for use in motor vehicle drives or milling machines.
The power motor also includes a safety clutch that will engage if the gate is obstructed when closing.
Best of all, it has an automatic safety clutch that keeps you from breaking your wrist if a bit or a hole saw binds in the work.
In addition, the trimmer includes the company's S-automatic safety clutch, which protects the motor and gearing from kickback when encountering obstacles (such as a wire fence or concrete wall).
A safety clutch further protects motor gearing by absorbing sudden shocks.
A two-position side handle allows the operator to grind comfortably and a safety clutch prevents injury from kickback in the event of a wheel jam.
Twenty years on, the company invented the hammer drill, and, in 1966, followed with the invention of its patented S-automatic safety clutch which protects users from excessive back-twist torque.
The transmitter reacts on the length compensation of the tapping chuck, which presses together while the safety clutch engages in the right hand direction and which is pulled out in the left direction.
The grinders feature the firm's S-automatic safety clutch for protection of the operator and the tool's gear train against kickback caused by wheel jams and the firm's exclusive long-life motor engineered with special winding protection for resistance to destructive grinding dust.
Feel for an increase in cable tension and listen for the motor to slow or the built-in safety clutch to slip.