Browse Prior Art Database

Differential Hydraulic Spring

IP.com Disclosure Number: IPCOM000097570D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Pittwood, DG: AUTHOR

Abstract

The device is a two-chamber hydraulic spring. A cylinder 10 is provided with a head 11 and a bushing 12. Slidably positioned in 12 is cylinder 14 provided with a head 15 that is formed to provide a piston moving in 10. Secured in 11 is a tube 16 on which is secured a stationary plug or piston 17. Packing rings 18 are provided between moving parts. This construction forms four chambers A, B, C and D. Chamber A is connected to chamber B by a tube 20 which is controlled by a valve 21. Chambers C and D are vented to the atmosphere through tubes 22 and 23. Any movement of 15 toward 17 causes chambers A and D to decrease in volume and chambers B and C to increase in volume. Any gas or liquid contained in A is transferred to B by 20 under control of 21.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 74% of the total text.

Page 1 of 2

Differential Hydraulic Spring

The device is a two-chamber hydraulic spring. A cylinder 10 is provided with a head 11 and a bushing 12. Slidably positioned in 12 is cylinder 14 provided with a head 15 that is formed to provide a piston moving in 10. Secured in 11 is a tube 16 on which is secured a stationary plug or piston 17.

Packing rings 18 are provided between moving parts. This construction forms four chambers A, B, C and D. Chamber A is connected to chamber B by a tube 20 which is controlled by a valve
21. Chambers C and D are vented to the atmosphere through tubes 22 and 23. Any movement of 15 toward 17 causes chambers A and D to decrease in volume and chambers B and C to increase in volume. Any gas or liquid contained in A is transferred to B by 20 under control of 21.

The characteristics of this device can be varied by altering the area ratio between the surface of piston 15 exposed to chamber B.

For a given excursion of 15, the volume displaced in A may be less than, equal to, or greater than the increase in volume in B, depending upon the above ratio. Thus, the combined volume of both A and B may be kept constant throughout the entire stroke of 15 or it may be made more or less at the end of the stroke than at the beginning, depending entirely upon the dimensional relationship. Obviously, if a compressible liquid is introduced into A and B, and the pistons are dimensioned to produce a volumetric change with piston movement, a spring action results due t...