Pump with temperature responsive seal

• US 3,277,797 A
• Filed: 03/26/1964
• Issued: 10/11/1966
• Est. Priority Date: 03/26/1964
• Status: Expired due to Term

• Current Assignee: Tyree J.R. Lewis, Wesley N. Munson
• Original Assignee: Tyree J.R. Lewis, Wesley N. Munson
• Inventors: TYREE JR LEWIS, Munson, Wesley N.
• Application Number:
  US04/354,967
• Time in Patent Office: 929 Days
• US Class Current: 92/194
• CPC Class Codes: F16J 15/164 the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
• CPC Class Codes: F16J 15/186 using springs
• CPC Class Codes: Y10S 92/01 Bearing on piston or cylinder

Claims

1. A PUMP CONSTRUCTION COMPRISING MEANS HAVING A GENERALLY CYLINDRICAL SURFACE DEFINING AN ELONGATED PUMPING CHAMBER, A PISTON CARRIED WITHIN SAID PUMPING CHAMBER FOR A RECIPROCAL MOVEMENT, SAID PISTON AND SAID CHAMBER BEING PROPORTIONED RELATIVE TO ONE ANOTHER SO AS TO PROVIDE AN ANNULAR SPACE BETWEEN THE SIDE WALL OF SAID PISTON AND THE SAID CYLINDRICAL SURFACE OF SAID CHAMBER, AND A RIGID ANNULAR SEALING MEMBER POSITIONED WITHIN SAID ANNULAR SPACE, SAID SEALING MEMBER BEING DIMENSIONED SUCH THAT WHEN SAID PUMP IS AT AMBIENT TEMPERATURE A SURFACE OF SAID MEMBER AND ONE OF SAID CHAMBER AND PISTON ARE IN NON-PRESSURE LOADED ENGAGEMENT WITH A CLEARANCE THEREBETWEEN OF NOT GREATER THAN ONE TEN-THOUSANDTH OF AN INCH, SAID SEALING MEMBER BEING FORMED OF A MATERIAL HAVING A COEFFICIENT OF CONTRACTION GREATER THAN THAT OF SAID ONE OF SAID CHAMBER-DEFINING MEANS AND PISTON SO AS TO HAVE A TENDENCY TO ALTER THE DIMENSIONAL RELATIONSHIP BETWEEN THE SAID SURFACE OF SAID