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Variable displacement pump

  • US 4,175,474 A
  • Filed: 11/15/1977
  • Issued: 11/27/1979
  • Est. Priority Date: 12/13/1976
  • Status: Expired due to Term
First Claim
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1. In a variable delivery fluid pump adapted for the feeding of liquid to the nozzle of a jet loom, the pump having a cylinder, a piston which reciprocates in the cylinder, said piston having a piston rod the outer free end of which extends outside an end of the cylinder, and a piston driving means including a driven eccentric means for reciprocating the piston, the improved piston driving means which comprises first and second generally parallel levers disposed outwardly of the outer free end of the piston rod, the levers extending at a substantial angle with respect to the path of reciprocation of the piston, means for pivotally mounting each of the levers for oscillation toward and away from the cylinder, the first lever being disposed nearer the cylinder and being drivingly connected to the outer end of the piston rod, the second lever being disposed further from the cylinder and coacting with the eccentric means so as to be oscillated thereby, and means mounted for adjustment along the length of the levers coupling them for joint oscillatory movement, adjustment of the last named means along the lengths of the levers changing the transmission ratio of both levers.

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