Safety device for motor-vehicle engine-speed governor

Claim 2

In a motor-vehicle engine-speed governor for automatically controlling the cruising speed of the motor vehicle through adjustment of the position of a throttle member of the motorvehicle engine, comprising a vacuum chamber for adjusting the position of said throttle member, control valve means for the control of the degree of vacuum of said vacuum chamber, and motor vehicle speed detecting means including a moving member responsive to change in the speed of the motor vehicle and operating said control valve means in accordance with the change in the motor vehicle speed, a safety device comprising safety valve means for placing said vacuum chamber in communication with the atmosphere, said safety valve means including a valve, spring means urging said valve to the closed direction and which places the vacuum chamber in communication with the atmosphere, said valve being opened by said moving member of said vehicle speed detecting means when the vehicle speed exceeds the maximum point of the cruising speed controlled by said engine-speed governor, said maximum point being lower than the maximum speed of the vehicle itself, whereupon the atmospheric air is admitted through said safety valve means into said vacuum chamber thereby to cause said engine throttle member to move to its closed position and thereby to reduce the vehicle speed.

Claim 3

The safety device for the motor-vehicle engine-speed governor as claimed in claim 1, in which an air filter is installed in said safety valve means in order to prevent the entrance of foreign matter when said normally closed valve of said safety valve means is opened to admit the atmospheric air into said vacuum chamber.

Claim 4

In a motor-vehicle engine-speed governor for automatically controlling the cruising speed of the motor vehicle through adjustment of the position of a throttle member of the motor-vehicle engine, comprising a vacuum chamber for adjusting the position of said throttle member, control valve means for the control of the degree of vacuum of said vacuum chamber, motor-vehicle speed detecting means including a moving member responsive to change in the speed of the motor-vehicle and operating said control valve means in accordance with the change in the vehicle speed, and electromagnetic valve means capable of providing communication between said vacuum chamber and the atmosphere upon depression of a brake pedal, said electromagnetic valve means including a plunger, a coil and a plunger switch, a safety device for said motor vehicle engine speed governor comprising normally open switch means to be closed by said moving member of said vehicle speed detecting means when the vehicle speed exceeds the maximum point of the cruising speed controlled by said engine speed governor, said maximum point being lower than the maximum speed of the vehicle itself, and means adapted to displace said plunger of said electromagnetic valve means upon closure of said normally-open switch means and thereby to place said vacuum chamber in communication with the atmosphere.

Claim 5

In a motor-vehicle engine-speed governor for automatically controlling the cruising speed of the motor vehicle through adjustment of the position of a throttle member of the motor-vehicle engine, comprising a vacuum chamber for adjusting the position of said throttle member, control valve means for the control of the degree of vacuum of said vacuum chamber, motor-vehicle speed detecting means including a moving member responsive to change in the speed of the motor-vehicle and operating said control valve means in accordance with the change in the vehicle speed, and electromagnetic valve means capable of providing communication between said vacuum chamber and the atmosphere upon depression of a brake pedal, said electromagnetic valve means including a plunger, a coil and a plunger switch, a safety device for said motor vehicle engine speed governor comprising normally open switch means to be closed by said moving member of said vehicle speed detecting means when the vehicle speed exceeds the maximum point of the cruising speed controlled by said engine speed governor, said maximum point being lower than the maximum speed of the vehicle itself, and means adapted to displace said plunger of said electromagnetic valve means upon closure of said normally-open switch means and thereby to place said vacuum chamber in communication with the atmosphere.

Claim 6

The safety device for a motor-vehicle engine-speed governor as claimed in claim 3, in which said means includes a coil to be energized upon closure of said normally-open switch means so that said plunger switch of said electromagnetic valve means is opened and said coil of said electromagnetic valve means is de-energized, thereby displacing said plunger and providing communication between said vacuum chamber and the atmosphere.