Sealed plunger-type pump

Abstract

Abstract A HAND PUMP COMPRISING A CYLINDER AND RECIPROCABLE PLUNGER THEREIN, THE SHANK OF THE PLUNGER PASSING OUT THROUGH AN APERTURED END FITTING OF THE CYLINDER. TO PREVENT LEAKAGE OF LIQUID PAST THE END FITTING BETWEEN THE LATTER AND THE SHANK OF THE PLUNBER, THERE IS SECURED TO THE CYLINDER END AND TO THE SHANK ADJACENT THE HANDLE THEREOF A TOUGH, PAPER-TIN, IMPERVIOUS, FLEXIBLE AND COLLAPSIBLE PLASTIC SLEEVE HAVING ITS ENDS RESPECTIVELY CONNECTED TO THE CYLINDER AND HUB OF THE HANDLE. DURING RECIPROCATION OF THE PLUNGER, THE SLEEVE EXPERIENCES A RANDOM FOLDING THE UNFOLDING. THE SLEEVE THUS ACTS SOMEWHAT LIKE A WATER-TIGHT CONTAINER, SUPPLEMENTING THE PACKING AROUND THE PLUNGER SHANK AND CONTAINING ANY LIQUID WHICH SEEPS PAST THE SAME. THE PAPER-THIN NATURE OF THE SLEEVE ENABLES IT TO BE ECONOMICALLY PRODUCED IN THE FORM OF A SMOOTH CYLINDER, SINCE ITS THIN WALLS READILY PERMIT COLLAPSING. THIS IS SHARP CONTRAST TO THICK-WALLED FLEXIBLE BELLOWS OR ACCORDION-LIKE DEVICES WHICH ARE COSTLY TO TOOL AND TO PRODUCE.

Inventors

• 👤 Frank S Beckerer

Bibliographic Details