US 4,730,542 A · Elevating apparatus for a working apparatus

Abstract

An elevating apparatus for a working vehicle includes separate front lifting and rear lifting mechanisms that can be elevated by hydraulic cylinders, a feedback rod arranged between a link arm of one of the lifting mechanisms and a hydraulic pressure control apparatus for controlling the hydraulic cylinders. A change-over lever selects the front lifting mechanism or the rear lifting mechanism, and an elevating lever controls elevation of the lifting mechanisms. When one of the lifting mechanisms is selected and elevated by operation of the change-over lever, the elevating lever is operated normally without causing abutment between an adjuster member attached to the feedback rod that is interactive with the elevating lever, and an interactive member of the elevating lever. A return mechanism between the change-over lever and the elevating lever enables the elevating lever to be returned to the neutral position when selecting one of the front and rear lifting mechanisms. By suitably changing the attached position of a feedback rod with respect to a hydraulic pressure control apparatus, a change-over lever can be attached dismountably to the hydraulic pressure control apparatus, and only one of the hydraulic cylinders can be operated, or both the hydraulic cylinders can be operated alternatively.

Claims7

Dependent claims

An elevating apparatus for a working apparatus, comprising:

a front lifting mechanism and a rear lifting mechanism each having a link arm and arranged to be capable of being elevated by pressure from hydraulic cylinders,
a hydraulic pressure control arrangement for controlling selectively a supply of pressure from at least two hydraulic cylinders,
a feedback rod coupled between the link arm of one of said front and said rear lifting mechanisms and said hydraulic pressure control arrangement,
an adjuster member fixed at a desired position along said feedback rod,
a change-over lever for selecting operation of one of the hydraulic cylinders and an elevating lever for causing the selected hydraulic cylinder to perform an elevation operation of a corresponding lifting mechanism, both said levers forming a part of said hydraulic pressure control arrangement,
an interactive member fixed to a part of said elevating lever for movement with the elevating lever and engaging said adjuster member in camming relation, said change-over lever including rod insertion means in which an end portion of said feedback rod opposite the end of the rod coupled to said link arm is allowed to pass, and
means coupled between the elevating lever and the change-over lever for enabling the elevating lever to be operated, including means for preventing said interactive member from interfering with movement of the adjuster member fixed on said feedback rod when either one of the front lifting mechanism or the rear lifting mechanism is selected and elevated.

4 more elements

An elevating apparatus for a working apparatus, comprising:

a front lifting mechanism and a rear lifting mechanism each having a link arm and arranged to be capable of being elevated by pressure from hydraulic cylinders,
a hydraulic pressure control arrangement for controlling selectively a supply of pressure from at least two hydraulic cylinders,
a feedback rod coupled between the link arm of one of said front and said rear lifting mechanisms and said hydraulic pressure control arrangement,
an adjuster member fixed at a desired position along said feedback rod,
a change-over lever for selecting operation of one of the hydraulic cylinders and an elevating lever for causing the selected hydraulic cylinder to perform an elevation operation of a corresponding lifting mechanism, both said levers forming a part of said hydraulic pressure control arrangement, and return means coupled between the elevating lever and the change-over lever, which return means, when either one of the front lifting mechanism or the rear lifting mechanism is selected by said change-over lever, causes the elevating lever to return to a neutral position accordingly.

2 more elements

Dependencies are inferred from the claim text.

Elevating apparatus for a working apparatus

Life of this patent

Elevating apparatus for a working apparatus

Life of this patent

Abstract

Claims7