Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1987-11-12
1990-05-15
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414690, 414694, E02F 300
Patent
active
049253581
ABSTRACT:
A small, self-contained portable back-hoe has a wheeled frame with a towing tongue for over-the-road trailering. Pivoted outriggers are connected to the back and a third support is secured to the front of the frame. Cylinder units are coupled to position the supports for digging and in raised position for trailering. The bucket and articulated boom assembly is affixed to the frame with a vertical pivot and includes cylinder units for digging operation thereof. An operator station and a hydraulic power supply source or system is secured to the front of the frame. A special hydraulic supply is integrated into the front framework. The back-hoe boom assembly and operating assembly are balanced about the single axle for convenient positioning. The bucket assembly and three-point support are arranged to minimize the tipping of the frame as a result of the digging forces. A gasoline driven high efficiency industrial-type pump is connected to the cylinder units with a filter and the suction side. A reservoir is built into the front frame structure and includes a watertower element to eliminate air from the hydraulic liquid. The reservoir reliably removes the air from the liquid to avoid pump malfunction.
REFERENCES:
patent: 3101854 (1963-08-01), Kampert
patent: 3777919 (1973-12-01), Konijn
patent: 3850473 (1974-11-01), Huber
patent: 4142642 (1979-03-01), Myers
patent: 4408949 (1983-10-01), Witty
Eller Jr. James T.
Spancrete Machinery Corporation
Spar Robert J.
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