Self-propelled boom with extendible axles

Details Self-propelled boom with extendible axles Self-propelled boom with extendible axles

1998-12-04

2000-09-19

Brahan, Thomas J.

Traversing hoists

Adjustable to transport or nonuse position

Vehicle stablizing means

180433, 180906, B60B 3510

Patent

active

06119882&

ABSTRACT:
A self-propelled boom vehicle has an extendible axle and an extendible steering mechanism which has an automatic steering synchronization system. The extendible axle has a hollow central support sleeve and telescopic arm sections. A single hydraulic extension axle is positioned inside the hollow central support sleeve and connects to and drives the telescopic arm sections between their retracted and extended positions. The steering synchronization system includes a pair of steering cylinders in a closed hydraulic circuit working in a master-slave arrangement and which operate inversely with respect to each other. A mechanical check valve is carried by each piston which allows excess hydraulic fluid to flow through the check valve to allow the piston to travel to the end of its stroke to resynchronize the steering.

REFERENCES:
patent: 2111668 (1938-03-01), Latzen
patent: 2557936 (1951-06-01), Brown
patent: 3092083 (1963-06-01), Sheppard
patent: 3240285 (1966-03-01), Williamson
patent: 3822759 (1974-07-01), Sheppard
patent: 4039094 (1977-08-01), Grove
patent: 4449600 (1984-05-01), Telfer
patent: 5454583 (1995-10-01), Torborg
patent: 5489113 (1996-02-01), Torborg

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