US 6,981,523 B2
Variable volume reservoir
Carl Seguin, Laval (Canada)
Assigned to Sobacor, Laval (Canada)
Filed on Jun. 16, 2004, as Appl. No. 10/869,385.
Application 10/869385 is a continuation in part of application No. 10/053661, filed on Jan. 24, 2002, granted, now 6,772,794.
Prior Publication US 2005/0011565 A1, Jan. 20, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. F16L 55/04 (2006.01)
U.S. Cl. 138—30 22 Claims
OG exemplary drawing
 
1. A variable volume reservoir for supplying fluid to a hydraulic system, comprising a casing and a movable reservoir head defining with the casing a variable volume chamber having a fluid port adapted to be connected in fluid flow communication with the hydraulic system, said movable reservoir head being a piston slidable mounted in said casing, a spring biasing said reservoir head towards a collapsed position wherein the volume of the variable volume chamber is minimal, and a guide extending axially along a major portion of the length of the spring to prevent said spring from buckling, said guide including an axially extending tube and an axially extending inner guide, said spring being received in said axially extending tube and extending about said axially extending inner guide.