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US 4,334,161 AGranted
Centrifugal switch and motor control
AssigneeThe Alliance Manufacturing Company, Inc.
InventorAlvin J. Carli
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AssigneeThe Alliance Manufacturing Company, Inc.
InventorAlvin J. Carli
Estimating the term…
A centrifugal switch is used in the motor control circuit in a garage door operator. Such operator has a motor driving through a friction clutch to move the door in opening and closing directions. If an overload condition on the door is encountered, the friction clutch will slip, slowing the driven member of the friction clutch. A cantilever contact blade is connected for rotation with the clutch driven member and slows, as well as moves radially inwardly, to engage a second conductor member which is coaxial with the output of the operator. This effects a switch-closed condition which acts through a control circuit to de-energize the electric motor. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
A centrifugal switch for use with a frame comprising, in combination,
A motor control circuit comprising, in combination,
Dependencies are inferred from the claim text.