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US 4,218,896 AGranted
Overload couplings
OwnerCornelis van der Lelyinventor
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OwnerCornelis van der Lelyinventor
Estimating the term…
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.
An overload coupling comprising two coupling members and frangible means, said frangible means, in normal operation, interconnecting said two coupling members for rotation together, rotary advancing means associated with said frangible means that advances, after fracture of said frangible means, an unfractured part of the remainder of said frangible means into an operative position in which said frangible means re-connects said two coupling members.
An overload coupling comprising two coupling members and frangible means which, in normal operation, interconnects said two coupling members for rotation together about a common axis, rotary advancing means associated with said frangible means and at least a portion of the latter being displaced by the advancing means, after fracture of the frangible means, said portion being urged into an operative position in which said portion re-connects said two coupling members for rotary movement in common.
An overload coupling comprising two coupling members and a frangible element which, in normal operation, interconnects the coupling members for common movement, said frangible element being at least partly bent relative to the remainder thereof and the bent part of said element interconnecting said members.
An overload coupling comprising two coupling members and frangible means, said frangible means normally interconnecting two coupling members for rotation together, said frangible means comprising a piece of edge material that is fractured upon overload.
A frangible element suitable for use in an overload coupling and interconnecting two coupling members for rotation together during normal operation, at least one operative frangible part of an element comprising a length of steel tape and said operative part being interposed between means that severs said part upon overload permitting relative rotation between the two members.
An overload coupling which comprises:
An overload coupling which comprises:
Dependencies are inferred from the claim text.