Patent ID: 9567993
Date: 2017-02-14
CPC Classifications: F04B

Claim:
1. A peristaltic pump tube holding system that allows tube elongation but prevents tubes from moving backwards comprising: a frame holding a peristaltic pump having an input and output; a pair of substantially cylindrical rollers on roller clutches mounted on said frame, said rollers having longitudinal teeth and positioned to cooperate with said peristaltic pump by clamping a peristaltic pump tube between them; said pair of substantially cylindrical rollers on roller clutches being located at the input or output of the pump; the roller clutches existing in a pair where a top clutch is orientated so that tube elongation can occur, and a lower clutch also oriented so that tube elongation can occur, the upper and lower roller clutches being mounted in opposite directions; the roller clutches enabling tube elongation when the pump operates in a forward direction, but holding, and not allowing elongation, when the pump is operated in a reverse direction for drip retention; at least one of said rollers on roller clutches being attached to a negator spring located in a string pot, said negator spring assisting in providing force between the rollers for small tubing to assist in elongation; the rollers having at least one concave region on an outer surface so that the peristaltic pump tube or tubes center or take predetermined positions between the rollers; at least one of said rollers on roller clutches being attached to a motor providing force between the rollers.