Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1981-05-13
1983-05-31
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
414715, 180273, 200 6158B, E02F 332
Patent
active
043858635
ABSTRACT:
A seat interlock mechanism for a skid-steer loader is disclosed wherein the boom structure can be rendered inoperable for vertical movement if the operator leaves his seat. The hydraulic circuit for powering the hydraulic cylinders, which move the boom structure in a vertical direction, includes a solenoid valve that is capable of stopping the flow of fluid through the hydraulic circuit and, thereby, prevent the boom structure from vertically moving. An improved seat frame structure, incorporating a switch which senses the presence of an operator on the seat, provides greater sensitivity for the presence of the operator, so that the switch can control the solenoid valve to stop or permit the flow of fluid through the circuit. The improved seat frame includes a first member mounted to the loader frame and a second member biased away from the first member by a spring positioned beneath the center of gravity of that portion of the seat being biased upwardly by the spring. The second member is connected to the first member by a plurality of bolts forming pivot axes forward and rearward of the spring. The switch signals the presence of an operator in the seat when the second member moves towards the first member and engages the switch by the weight of the seat and the operator exceeding the upwardly biasing force of the spring.
REFERENCES:
patent: 3487451 (1969-12-01), Fontaine
patent: 3749866 (1973-07-01), Tiazkun et al.
patent: 3995761 (1976-12-01), Hurlburt
patent: 4019602 (1977-04-01), Habiger
patent: 4059196 (1977-11-01), Uchino et al.
Marquette Darrell F.
Miller Larry W.
Seemar Frank A.
Siemens Terrance L.
Spar Robert J.
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