Allen P Hansen

US Patent:

6460571, Oct 8, 2002

Filed:

Dec 19, 2001

Appl. No.:

10/026185

Inventors:

Bahram S. Rajabi - Belvidere IL
Allen R. Hansen - Winnebago IL

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

F16L 5504

US Classification:

138 31, 138 30, 138 26, 138109

Abstract:

An accumulator for a fluid system includes a canister and an end cap at one or both ends of the canister. The end cap has a cylindrical peripheral surface, with a groove or channel having gradually rounded or curved sidewalls, formed circumferentially around the cap, and spaced from the axial ends of the cap. An annular, radially-outward projecting flange is provided at the axially outer end of the cap, and serves as a locating feature for the cap when it is inserted into the canister. A forming tool such as a crimping machine is used to mechanically deform the canister into the groove. The rounded shape of the groove creates a permanent, fluid-tight attachment with the canister. The accumulator can include either a piston or bladder.

US Patent:

7984731, Jul 26, 2011

Filed:

Nov 13, 2008

Appl. No.:

12/270203

Inventors:

Bahram S. Rajabi - Belvidere IL, US
Allen R. Hansen - Winnebago IL, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

F16L 55/04

US Classification:

138 31, 138 30

Abstract:

A lightweight high pressure repairable piston composite tie-rod accumulator that does not use a load bearing metallic liner. An exemplary accumulator includes composite tie rods that sustain the axial stress induced by pressurization of the accumulator, while the shell is designed such that it sustains the stress of pressurization in the hoop direction. The tie rods can be secured using a wedge-type tie rod retention mechanism. As a result, no pretension is applied to the tie rods and the composite shell may be designed entirely for hoop stress.

US Patent:

20090126815, May 21, 2009

Filed:

Nov 10, 2008

Appl. No.:

12/267783

Inventors:

Bahram S. Rajabi - Belvidere IL, US
Allen R. Hansen - Winnebago IL, US

International Classification:

F16L 55/04
B23P 15/00

US Classification:

138 31, 2989006, 138 30

Abstract:

A reduced weight and repairable piston accumulator. The accumulator includes a load bearing metallic cylinder with removable end caps secured thereto with slip flanges for allowing repairability and for achieving the required cycle life. The cylinder serves as the surface on which the piston slides and is designed such that it sustains the axial stress induced by pressurization of the accumulator. A composite over wrapping is designed such that it sustains the stress in the hoop (radial) direction. A stress transitioning bushing can be provided for transitioning hoop stresses between the overwrap and the slip flange. When combined with the cylinder, the fibers of the composite wrap will not be placed in shear and thus will not fatigue in the same manner as some prior art designs.