Land vehicles – Wheeled – Articulated vehicle
Patent
1980-10-15
1983-06-14
Peters, Jr., Joseph F.
Land vehicles
Wheeled
Articulated vehicle
172439, 188313, 280461A, B60D 702
Patent
active
043879101
ABSTRACT:
An overload coupling member is used as a strut to interconnect the upper link of a tractor lift device with an implement, such as a cultivator. The member includes two portions that are moved towards one another upon overload to allow the implement to pivot upwardly on the other two links. One portion has an inner end sleeve pivoted to a further sleeve on the other portion's inner end and relative movement between the two portions is prevented by a shear pin that extends into an opening of the sleeves. Upon overload, the pin shears and the portions jack-knife until the lift raises the implement past the obstacle and the implement is then lowered. The inner opening end is normally closed by an abutment member, but when the portions are pivoted, the opening is exposed and a severed pin portion falls out. The shear pin can have a number of severable portions and be spring biased to slide in a holder and establish rigid connection between the two portions a number of times. In another version, the portions can be a cylinder and a piston with rod respectively. On either side of the piston fluid spaces are interconnected through a circuit having a pressure relief valve. The valve is biased by a spring that can be set to yield when the pressure exceeds a predetermined value. A by-pass conduit also allows movement of fluid from one space to the other accompanied by the movement of the piston in the cylinder. Thus, a set screw in the conduit can be used to open the conduit until the portions are set in desired relative positions and the member has the correct overall length.
REFERENCES:
patent: 2405980 (1946-08-01), Sands
patent: 2723007 (1955-11-01), Lanphere
patent: 3033323 (1962-05-01), Manna
patent: 3143180 (1964-08-01), Davis
patent: 3376958 (1968-04-01), Carr
patent: 3889969 (1975-06-01), Otani
patent: 3905425 (1975-09-01), Jackson
patent: 3929057 (1975-12-01), Kondo
patent: 4049239 (1977-09-01), Howell
Albright Penrose Lucas
Peters Jr. Joseph F.
Weaver Ross
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