초록 ▼

A hydraulic steering mechanism is used in a self-propelled, non-riding trenching machine of the type having a chassis, a power source, a hydraulic pump driven by the power source, a reservoir supplying hydraulic fluid to the hydraulic pump and a digging boom. The steering mechanism includes a front

A hydraulic steering mechanism is used in a self-propelled, non-riding trenching machine of the type having a chassis, a power source, a hydraulic pump driven by the power source, a reservoir supplying hydraulic fluid to the hydraulic pump and a digging boom. The steering mechanism includes a front wheel assembly journaled into the chassis, a double acting cylinder pivotally mounted to the chassis, a piston and rod slidably mounted within the cylinder and pivotally connected to the front wheel assembly, a first port located on one side of the piston and a second port located on an opposite side of the piston, and a manually operable three-position valve communicating with the hydraulic pump and the cylinder so that hydraulic fluid can be directed from the pump alternately to the first or second ports causing the rod alternately to extend or retract thereby rotating the front wheel assembly from side to side.

대표청구항 ▼

In a nonridable, trenching machine of the type having a chassis, a power source, a hydraulic pump driven by the power source, a reservoir supplying hydraulic fluid to the hydraulic pump, and a digging boom cantilevered outwardly from a front portion of the chassis; the improvement comprising: front

In a nonridable, trenching machine of the type having a chassis, a power source, a hydraulic pump driven by the power source, a reservoir supplying hydraulic fluid to the hydraulic pump, and a digging boom cantilevered outwardly from a front portion of the chassis; the improvement comprising: front fender means extending outwardly from the front portion and being adjacent and parallel to the digging boom; a front wheel assembly journaled into the fender means; a double acting cylinder extending between the chassis and the front wheel assembly; and manually operable valve means located on a rearmost portion of the chassis and communicating with the hydraulic pump and the cylinder such that hydraulic fluid is directed from the pump to the cylinder to selectively rotate the front wheel assembly.