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HAND VACUUM PUMP

  • US 3,612,722 A
  • Filed: 03/03/1969
  • Issued: 10/12/1971
  • Est. Priority Date: 03/03/1969
  • Status: Expired due to Term
First Claim
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1. A compact vacuum pump comprising a cylinder and piston assembly, the cylinder of the assembly including an elongated body having a cover on a first end thereof, and inlet opening through said cover and an exhaust outlet through said cylinder at first end thereof, and the piston of the assembly comprising a piston head having resilient member coupled therewith and a piston rod, the interior of said body at said first end of said cylinder and said piston head being configured to allow said piston head to move completely to said cover at said first end of said cylinder for creating a minimum void between said piston head and interior of said cylinder at said first end for enabling a good vacuum to be drawn through said inlet by reciprocation of said piston in said cylinder, first valve means coupled with said inlet opening of said cylinder, and second valve means coupled with said exhaust outlet of said cylinder, biasing means coupled with said piston for normally biasing said piston toward said first end of said cylinder, and adapter means coupled with said cylinder and housing said first valve means for enabling a vacuum to be drawn on an external device, said adapter means including manually operable valve means for releasing the vacuum drawn on an external device.

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