US 5,664,372 A · Clutchless screw drive door operator

Abstract

A garage door operator is disclosed to have a front coupling for a threaded screw of the operator and the rotor of the motor. The coupling includes a first coupling device that is a unitary coupling member with opposing recesses for receiving each of the rotor shaft and an end portion of the screw. The unitary coupling member thereby connects the screw to the motor for torque transmission from the motor. The second coupling device includes a thrust containment device that is supported on the screw, and an intermediate assembly disposed between the thrust containment device and an end portion of the guide rail of the door operator. A retainer component of the intermediate assembly restricts expansion of the thrust containment device.

Claims8

Dependent claims

A garage door operator comprising:

a motor having a stator and a rotor, said rotor having a shaft which transmits torque developed by said motor;
a threaded screw having an end portion;
a guide rail for at least partially containing said screw, said guide rail having an edge portion;
coupling means for coupling said screw to said rotor shaft and absorbing thrust transmitted along said screw toward said motor when said coupling means couples said screw and said motor, said coupling means including a first coupling and a second coupling,
said first coupling including a coupling member for connecting each of said rotor shaft and said screw end portion for transmission of torque from said motor to said screw, and
said second coupling including thrust containment means supported by said screw and means disposed intermediate said thrust containment means and said guide rail edge portion.

3 more elements

Dependencies are inferred from the claim text.

Clutchless screw drive door operator

Life of this patent

Clutchless screw drive door operator

Life of this patent

Abstract

Claims8