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Manually operable vacuum pump

  • US 5,494,410 A
  • Filed: 02/17/1994
  • Issued: 02/27/1996
  • Est. Priority Date: 02/17/1993
  • Status: Expired due to Fees
First Claim
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1. A vacuum pump comprising:

  • a housing containing first and second pump chambers, the first and second pump chambers being defined by interior walls of the housing, first and second end caps and a displaceable piston, the first pump chamber having an inlet opening including a first valve for providing gas to the vacuum pump, the second pump chamber having an outlet opening including a second valve for expelling gas from the vacuum pump, the first and second pump chambers having first and second chamber volumes respectively, the first chamber volume of the first pump chamber and the second chamber volume of the second pump chamber being altered based upon a displacement of the displaceable piston, the displaceable piston being coupled to a piston rod which is fed through one of the first and second chambers and one of the first and second end caps, the first pump chamber being in selectable fluid communication with the second pump chamber, wherein gas that is provided to the vacuum pump is compressed in two stages, initially in the first pump chamber and secondarily in the second pump chamber, and wherein the first pump chamber volume having a maximum value when the displaceable piston is at a point closest to the second end cap, the first chamber volume having a minimal value when the displaceable piston is at a point closest to the first end cap, the second chamber volume representing a chamber volume when the first chamber volume is a minimum value, the second chamber volume representing a clearance volume when the first chamber volume is a maximum value, wherein the vacuum pump is designated such that a ratio of chamber volume to clearance volume is at least 181.

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