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Self-driven pump device

  • US 5,135,500 A
  • Filed: 10/31/1989
  • Issued: 08/04/1992
  • Est. Priority Date: 10/31/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for delivering fluid with a relatively constant, controlled rate of flow comprising, in combination a first chamber comprising a vacuum power chamber for driving the fluid to be delivered from the apparatus, said first chamber comprising a sealed portion comprising at least a partial vacuum, a separate second chamber comprising a fluid storage chamber adapted to receive a fluid, said second chamber being mounted to said first chamber in axial alignment with said first chamber, said plunger means carried in said first chamber to effect delivery of fluid from the apparatus, said plunger means comprising a rod means and first head, said first head forming a movable wall of said sealed portion in sealing and sliding engagement with said first chamber, said first chamber having a first end open to the atmosphere, and a second end sealed to the atmosphere, said plunger means being disposed in said first chamber so that the movable wall of said plunger means forms one end of the sealed portion, and said rod means being connected to said first head and extending from the sealed end of said first chamber in axial communication with said second chamber, said first head being in sealing and sliding assembly with said rod means and including engaging means for engaging said rod means when said first head is substantially near the open end of said first chamber, handle means secured to said first head to permit said first head to be moved forward said open end of said first chamber to allow said engaging means to engage said rod means, said second chamber having a first end for receiving the rod which extends from said first chamber and a second end forming an orifice through which fluid is delivered, the first chamber being evacuated when the movable wall of said plunger means is substantially at the open end of the first chamber so that atmospheric pressure acts upon said plunger means to drive it toward the sealed end of said first chamber, whereby when the orifice in said second chamber is opened, atmospheric pressure acting upon said plunger means drives the movable wall of the plunger toward the sealed end of the first chamber and drives the rod received by the second chamber toward the orifice of the second chamber through the orifice to deliver the fluid from the apparatus.

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