| 摘要 |
<p>An electric shift control for a stern drive for a boat includes a pair of snap action switches conjointly controlling an electro-responsive hydraulic shift to place the gears in a neutral position, a forward drive position or a reverse drive position or condition. Each of the switches is a single pole, double throw unit having a movable spring-loaded contact pole with a pair of alternate positions engaging first and second fixed contacts. A first switch has the movable contact connected to a power supply and provides power to a first drive position contact or in the alternate to provide power to a power transfer contact connected to the movable contact of the second switch. The first fixed contact of the second switch provides power to establish the neutral position and the second fixed contact connects power to establish the second drive position. A pivotally mounted cam is provided with a two or three level peripheral cam edge. With a three level cam, a single pivotally mounted actuating arm rides on the cam edge and sequentially engages undivided input members coupled to the common contact poles. Movement in one direction effects a first drive position while movement in the opposite direction effects the opposite drive position. With a dual level cam, separate actuators ride on the cam edge to separately and individually actuate the snap action switches. The control preferably also includes a push-button warm-up switch connected between the power supply and the first control switch. The control lever, in turn, is coupled such that movement from a neutral position actuates a suitable locking mechanism to hold the switch in the warm-up position until the shift lever is moved to the neutral position, at which time the switch is released and the circuit returns to the normal shift condition.</p> |
