US 4,394,893 A · Engine shut-off system with flywheel braking

Abstract

A system for quickly stopping the internal combustion engine of a powered implement having a deadman control normally biased toward a first position and actuable by the implement operator to a second position and having an operator actuable engine starting mechanism is disclosed. The engine has a flywheel coupled thereto for rotation with the engine crankshaft and that flywheel is provided with an annular friction surface disposed generally in a plane normal to the axis of rotation of the flywheel. A braking member having a second friction surface is normally biased into engagement with the annular friction surface of the flywheel and coupled to the deadman control so that the two friction surfaces will be disengaged upon movement of the deadman control to a second or operational position by the implement operator. An arrangement for disabling the engine starting mechanism while the friction surfaces are engaged and an arrangement for disabling the engine ignition system when the deadman control is released are disclosed. The braking member may move into engagement by pivotal movement, movement perpendicular to the flywheel annular friction surface, or by moving generally parallel to the flywheel annular surface and into engagement with a ramp forcing the braking member toward the flywheel surface.

Claims25

Dependent claims

A safety device for an internal combustion engine powered implement having a deadman control normally biased toward a first position and actuable by an implement operator to a second position comprising:

a flywheel coupled to the engine crankshaft for rotation therewith;
a braking member having a friction surface normally biased into engagement with an annular surface of the flywheel, biasing of the deadman control and the biasing of the braking member both being accomplished by one coil spring, the braking member comprising a friction surface supporting lever, a pivot pin fixed relative to the engine pivotably supporting the friction surface supporting lever near one end thereof, the coil spring encircling the pivot pin and having one end fixed relative to the engine and the other end fixed relative to the friction surface supporting lever;
means coupling the braking member to the deadman control for retracting the frictional surface out of engagement with the flywheel annular surface upon movement of the deadman control to the second position;
a pair of electrical switches actuated by movement of the braking member, one of the electrical switches being actuated by movement of the braking member toward its engine engaging position to disable the engine ignition system.

1 more element

Dependencies are inferred from the claim text.

Engine shut-off system with flywheel braking

Life of this patent

Engine shut-off system with flywheel braking

Life of this patent

Abstract

Claims25