초록 ▼

Hydrostatic tractor\s drive and braking system, particularly one controlled, first, by a tractor safety lock lever which, when put “on,”both neutralizes the engine-driven, variable ratio hydrostatic system for positively preventing drive and also sets the brakes for simultaneously positively prevent

Hydrostatic tractor\s drive and braking system, particularly one controlled, first, by a tractor safety lock lever which, when put “on,”both neutralizes the engine-driven, variable ratio hydrostatic system for positively preventing drive and also sets the brakes for simultaneously positively preventing rolling and, second, by a two-stage brake pedal which is overcontrolled by the safety lock lever whenever the lever is “on”and which operates initially to intensify engine braking by increasing the hydraulically fixed ratio of the hydrostatic drive and its rate of dynamic dissipation of power, and which operates finally to neutralize drive and set brakes in an overlapping sort of way with the function of the safety lock lever and exactly the same as the safety lock lever does whenever “on.

대표청구항 ▼

A safety device system for a hydrostatic vehicle\s drive and dual brakes, said drive comprising a prime powered dual path pump-motor hydrostatic drive including an oppositely disposed pair of hydrostatic drive motors having, at their fluid-supplied input, a bypass thereacross and arranged to be oper

A safety device system for a hydrostatic vehicle\s drive and dual brakes, said drive comprising a prime powered dual path pump-motor hydrostatic drive including an oppositely disposed pair of hydrostatic drive motors having, at their fluid-supplied input, a bypass thereacross and arranged to be operatively connected to for bypasing the drive motors so as to provide drive in neither way between the source of prime power and the vehicle, and an oppositely disposed pair of hydrostatic pumps with hydraulic connections for normally supplying pumped fluid to the motor input, but also serving, whilst coasting so that the pumps motor their source of prime power for dynamic braking, to cause the motors to drive the pumps thereby loading the motors for dynamic dissipation of their power, said system comprising an improved safety control arrangement including: a safety lock handle (22); and interconnections (92,96) operative from the safety lock handle to each of the dual motors (38,40) and dual brakes (82,82a) affording control of the former, in a removed, lock-on angular position, over the dualities of the latter for simultaneously bypassing both motors and applying both brakes, and affording the handle control, in a driver-obstructing lock-off angular position, over the dual pumps (56,56a), dual motors, and dual brakes for simultaneously releasing both brakes and restoring both motors to unbypassed condition so as not to interfere with both pumps in simultaneously motoring their source of prime power for dynamic braking and dissipation of power as described.