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Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid (s)

  • US 5,033,656 A
  • Filed: 08/22/1990
  • Issued: 07/23/1991
  • Est. Priority Date: 02/21/1989
  • Status: Expired due to Fees
First Claim
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1. Valve means for on/off flow permitting/preventing of flowable work material in a squeezable tube means comprising:

  • a) a first member means operable to move toward and away from said squeezable tube means to cause constriction and relief of constriction in said squeezable tube means, said first member having a first length of stroke and having a first tube engagement area means of predetermined size;

    b) a second member means operable to move toward and away from said squeezable tube means to cause constriction and relief of constriction of said squeezable tube means, said second member means having a second length of stroke, and having a second tube engagement area means of second predetermined size, said second member means being characterized as having said second length of stroke being less than said first length of stroke, and said second area means predetermined size is greater than said first area means predetermined size;

    c) connection means for causing said first member means and said second member means to move in substantially opposing simultaneous directional relationship;

    whereby the flow of flowable work material in said tube means is substantially unaffected by movement of said first member.

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