Hubbell Limited

Thomas D Hirt

Christopher Allen Hudson

Gerry F Thornton

A protection circuit for an HID dimming circuit is provided. A resistive component limits the initial current after a relay closes and current flows from a charged capacitor to a second capacitor. An inductive component limits the rate of change of current through the circuit. A voltage limited device limits voltage across the contacts of a solid state relay. The circuit is preferably formed in a small module that is adapted to be plugged into an HID lighting device.

Self-contained, self-snubbed, HID dimming module that exhibits non-zero crossing detection switching

A pole top cover assembly includes a generally flat cover plate adapted to overlie an open top end of a tubular hollow pole, an elongated arcuate-shaped bracket formed of yieldably resilient, semi-rigid, semi-flexible deformable material and being disposable along one side of the cover plate, and an elongated fastener rotatably mounted through both an aperture in the cover plate and a hole in the bracket and having external threads threadably engaged with portions of the plate and bracket which form the respective aperture and hole thereof. Rotation of the fastener in one direction relative to the cover plate and bracket causes the arcuate-shaped bracket to engage the plate and to deform and draw toward the one side of the cover plate and thereby expand in length and forcibly engage at opposite ends with portions of an interior surface of the hollow tubular pole so as to retain the cover plate on the pole top end. Rotation of the fastener in an opposite direction relative to the cover plate and bracket permits the arcuate-shaped bracket to engage the plate and to reform and retract away from the one side of the cover plate and thereby contract in length and disengage at the opposite ends from the portions of the interior surface of the hollow tubular pole so as to release the cover plate from the pole top end.

Growing community of inventors

Blacksburg, VA, United States of America

Thomas D Hirt