Magnet piston retention for free wheeling
AssigneeClark Equipment Company
InventorThomas R. Burnight
Life of this patent
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Abstract
A fixed displacement fluid motor or pump of the ball or roller piston type in which a plurality of axially or radially extending reciprocating pistons co-act with a cam track to produce output motion or to generate pressure fluid output, respectively. Permanent magnets are secured either to the pistons or in or adjacent the cylinders for holding the pistons in fixed retracted positions beyond one end of the normal stroke of the pistons under certain conditions of relatively low fluid operating pressure in the cylinders which occur in modes of operation during which no motor or pump output is desired.
Claims11
In a fixed displacement fluid pump or motor having a plurality of piston means reciprocable in cylinder means and means normally in driving or driven contact with said piston means, magnet means cooperating with said piston means and operable only under certain conditions of relatively low fluid operating pressure in said cylinder means to hold said piston means out of contact with said driving or driven means, and valve means in fluid communication with said cylinder means through passage means in at least a portion of said magnet means.
Dependencies are inferred from the claim text.