Abstract: Embodiments of the present invention include bicycle chain rings for bicycles having specially shaped ramps, tapers and profiled teeth for improved shifting performance. Additional embodiments of the bicycle chain rings of the present invention may be configured with one or more additional features formed within the chain rings including a transition slide, a tapered ramp face, a ramp bridge, a ramp lead, a trailing transition slide and a wear pin.

Abstract: Latching apparatus for use with a fire damper assembly wherein extendable and retractable damper leaves normally are maintained by a fusible linkage in a position enabling air to flow through a duct. The fusible linkage may be coupled to and uncoupled from a damper-supporting frame so as to facilitate testing of the damper assembly to ensure it is capable of automatically moving from its passage-open position to a passage-closed position in response to a predetermined rise in ambient temperature. The latching mechanism is operable simply by squeezing a spring retainer to enable it to pass into and out of latched engagement with a latch keeper.