Patent ID: 7252073

Claim:
An engine timer comprising a predetermined rotary shaft ( 22 ) to which a driving wheel ( 1 ) is attached, the driving wheel ( 1 ) having one lateral portion at which a driven wheel ( 2 ) is arranged and having the other lateral portion at which a pair of centrifugal weights ( 3 , 3 ) are arranged, respectively, each of the paired centrifugal weights ( 3 , 3 ) being urged in a centripetal direction by a weight-return spring ( 5 ) composed of a compression coil spring, there being provided between the driving wheel ( 1 ) and the driven wheel ( 2 ) an eccentric cam mechanism ( 4 ) which is interlockingly connected to the pair of centrifugal weights ( 3 , 3 ), wherein a force of unbalance between a centrifugal force of each of the paired centrifugal weights ( 3 , 3 ) and an urging force of the weight-return spring ( 5 ) operating the respective centrifugal weights ( 3 , 3 ), when each of the centrifugal weights ( 3 , 3 ) moves in a centrifugal direction, it advances the driven wheel ( 2 ) with respect to the driving wheel ( 1 ) through the eccentric cam mechanism ( 4 ) and when each of the paired centrifugal weights ( 3 , 3 ) moves in a centripetal direction, it lags the driven wheel ( 2 ) with respect to the driving wheel ( 1 ) through the eccentric cam mechanism ( 4 ), and wherein each of the paired centrifugal weights ( 3 , 3 ) is interlockingly connected to an advancing spring ( 6 ), composed of a compression coil spring, which is interlockingly connected to a temperature-sensing operation means ( 7 ), when starting the engine during a cold term, the advancing spring ( 6 ) being maintained extensible based on a state of the temperature-sensing operation means ( 7 ), in which the temperature-sensing means ( 7 ) senses a temperature to operate, and exerting a spring force which pushes and widens the paired centrifugal weights ( 3 , 3 ) to an advancing position (Ac) for cold-staring the engine and while the engine is warm, the advancing spring ( 6 ) being held contracted based on another state of the temperature-sensing operation means ( 7 ), in which the temperature-sensing operation means ( 7 ) senses a temperature to operate, so that the spring force of the advancing spring ( 6 ) does not act on the pair of centrifugal weights ( 3 , 3 ), a shape memory spring ( 8 ) of a compression coil spring being used for the temperature-sensing operation means ( 7 ), the shape memory spring ( 8 ) and the advancing spring ( 6 ) being interposed between the pair of centrifugal weights ( 3 , 3 ) in a position concentric with the weight-return spring ( 5 ).