| 摘要 |
A device to prevent the gears of an automotive vehicle from being shifted from forward, reverse or neutral to another position unless the brakes are firmly applied. The transmission includes a gear shift actuator that is rotatable between forward, neutral and reverse positions, and fixed to this actuator is a lever having an axially projecting fin on one side of the free end. Pivoted on a supporting frame is a steel bar having notches in one edge that are shaped and positioned to engage the fin on the lever whenever the lever is in any one of its three operating positions. A spring bears against the bar to urge the notched edge toward the fin of the lever, so that the bar normally engages and locks the lever. A hydraulic cylinder has its piston rod attached to the bar, and the cylinder is connected to the hydraulic braking system of the vehicle, so that when the brakes are applied, the cylinder acts to disengage the bar from the lever. Thus, the transmission can only be shifted into or out of gear while the brakes are applied.
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