Emhart Industries, Inc.

Robert S Coulter

Michael T Clouser

Kenneth E Deane

A flue damper is rotated 360.degree. in a predetermined direction in 90.degree. increments to be selectively opened and closed in 90.degree. increments. The incremental rotation is accomplished by a motor driven timing mechanism with power to the motor being controlled by the timing mechanism and a single pole double throw relay.

Means controlling a flue damper

An improvement is presented for a timing mechanism wherein the closing of a particular circuit results in a high electrical current surge. The rapidity of the circuit closure (made necessary by the current surge) results in contact bounce. A fast drop of a cam follower is provided by a cam having a substantially flat outer periphery and a face which has a steep drop with a gentle curvature. Upon dropping the cam follower, electrical contact arms are engaged which include a coil spring damper to dissipate kinetic energy encountered during contact closure, thereby preventing the contacts from bouncing.

Growing community of inventors

Plainfield, IN, United States of America

Robert S Coulter