192 clutches and power-stop control
Patent
1978-01-31
1980-08-26
Lazarus, Ira S.
192 clutches and power-stop control
64 1R, 192, F16D 900
Patent
active
042188962
ABSTRACT:
An overload coupling includes an automatically positioned frangible portion to replace a just fractured frangible portion. A first coupling member caused to rotate by the power take-off of a tractor, or the like, has a rotary advancing spring connected thereto which can be hand wound to bias a removable magazine for the frangible element carried by a housing mounted on the first coupling member so as to be rotated by the advancing spring. A second coupling member is journalled on the first coupling member and drivingly connects to an agricultural implement or the like. It further connects through the frangible element to the first coupling member. The first coupling member defines a guide for the end of the frangible element, a portion of which is received in a slot or opening in the second coupling member. When the portion of the frangible element in such opening fractures due to an overload transmitted from the implement to the second coupling member, the advancing spring causes a further frangible portion to be introduced into the opening after, however, the first coupling member has its speed sufficiently reduced to permit such introduction. In one embodiment, the frangible element is a steel tape; in another it is a plurality of radially extending shear pins each adapted to be twice fractured. A cam on the interior of a ring advanced by the spring causes a non-fractured (or once fractured) shear pin to be moved into the opening therefor following each fracture of the preceding pin in the opening. The shear pins are disposed in single or double rows in an arc of about 160.degree. in the first coupling member. In another embodiment, the shear pins extend parallel to the axis of rotation of the coupling members.
REFERENCES:
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patent: 3589487 (1971-06-01), Donnell
patent: 3866728 (1975-02-01), Dowin
patent: 3982408 (1976-09-01), Wright
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