Title:
SMART SPRINGS AND THEIR COMBINATIONS
Document Type and Number:
WIPO Patent Application WO/2015/166476
Kind Code:
A3
Abstract:
Springs of different types are provided with the ability to dynamically change stiffness. For one embodiment turning the elastic beams with elongated cross-section inside a leaf spring's housing plate, leaf springs stiffness is varied. Second embodiment springs made of hollow tubing filled with oil wherein inside pressure is changed by an actuated membrane or piston whose movement increases the hydrostatic pressure inside the tubing and expands the diameter of tubing, thereby varying its stiffness. Another embodiment features annular corrugated tubing which with the increase in inside pressure will lengthen, producing coil radius expansion and decrease in spring stiffness. Still another embodiment uses corrugated tubing inside a retaining cylinder; said tubing expands lengthwise when inside pressure is increasing but retaining cylinder forces the lengthening tubing to produce new coils inside of it resulting in spring length increase that is actuation and stiffness variability resulting from coil number variability.
Inventors:
BOGRASH PHILIP (IL)
BOGRASH ROGER
BOGRASH ROGER
Application Number:
PCT/IL2015/000021
Publication Date:
March 31, 2016
Filing Date:
April 30, 2015
Export Citation:
Assignee:
BOGRASH PHILIP (IL)
BOGRASH ROGER
BOGRASH ROGER
International Classes:
F16F9/50; F16F5/00; F16F9/52
Domestic Patent References:
| WO1997025551A2 | 1997-07-17 |
Foreign References:
| GB2473452A | 2011-03-16 | |||
| US4842106A | 1989-06-27 | |||
| US4765600A | 1988-08-23 | |||
| US3647199A | 1972-03-07 |
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