US4634082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extendable shock strut
Assignee: Coltec Industries Inc
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Filing: 1983-05-10
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Granted: 1987-01-06
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Expires: 2003-05-10
Abstract
Abstract An extendable shock strut comprising a strut housing having an open end and a closed end and a piston including a piston housing and a piston head slidable in the strut housing. The piston housing and the strut housing are adapted to move a selected distance relative to one another under normal usage. A source of high pressure gas is provided coupled to the shock strut for rapidly driving the strut housing and the piston housing relative to one another to an extended position. In a particular embodiment of the invention, an expandable chamber is formed from the closed end of the strut housing and a secondary piston slidable in the strut housing and positioned between the closed end of the strut housing and the piston head. The high pressure gas rapidly expands the chamber and drives the secondary piston toward the piston head to cause the piston housing and the strut housing to move relative to one another to the extended position.
Inventors
- 👤 Giles A. Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:53
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/32; B64C25/58; B64C25/60; B64C25/001; B64C2025/008
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
130 words
An extendable shock strut comprising: a strut housing having an open end and a closed end; a piston including a piston housing and a piston head slidable in said strut housing, said piston housing and said strut housing adapted to move a selected distance relative to one another under normal usage and to provide a shock absorbing action; a secondary piston slidable in said strut housing and positioned between said closed end of said strut housing and said piston head, said secondary piston including a secondary piston head, said secondary piston head and said closed end of said strut housing forming an expandable chamber; and expansion means coupled to said shock strut for rapidly driving said strut housing and said piston housing relative to one another to an extended position.
Claim 2
Dependent Claim
130 words
An extendable shock strut comprising: a strut housing having an open end and a closed end; a piston including a piston housing and a piston head slidable in said strut housing, said piston housing and said strut housing adapted to move a selected distance relative to one another under normal usage and to provide a shock absorbing action; a secondary piston slidable in said strut housing and positioned between said closed end of said strut housing and said piston head, said secondary piston including a secondary piston head, said secondary piston head and said closed end of said strut housing forming an expandable chamber; and expansion means coupled to said shock strut for rapidly driving said strut housing and said piston housing relative to one another to an extended position.
Claim 3
Dependent Claim
27 words
The shock strut of claim 1 further comprising stop means for limiting the relative motion of said strut housing and said piston housing to said extended position.
Claim 4
Dependent Claim
37 words
The shock strut of claim 1 wherein said expansion means includes a hot gas generator for generating a high temperature, high pressure gas for rapidly driving said strut housing and said piston housing relative to one another.
Claim 5
Dependent Claim
26 words
The shock strut of claim 3 wherein said expansion means includes a bleed down valve for releasing said gas after said shock strut has been extended.
Claim 6
Dependent Claim
18 words
The shock strut of claim 4 wherein said bleed down valve is a thermally actuated bleed down valve.
Claim 7
Dependent Claim
18 words
The shock strut of claim 4 wherein said bleed down valve is a solenoid operated bleed down valve.
Claim 8
Dependent Claim
28 words
The shock strut of claim 1 wherein said expansion means is coupled to said strut housing and drives said piston and said strut housing relative to one another.
Claim 9
Dependent Claim
49 words
The shock strut of claim 1 wherein said expansion means is coupled to said expandable chamber for rapidly expanding said chamber and driving said secondary piston toward said piston head to cause said piston housing and said strut housing to move relative to one another to said extended position.
Claim 10
Dependent Claim
20 words
The shock strut of claim 8 wherein said expansion means drives said secondary piston into contact with said piston head.
Claim 11
Dependent Claim
147 words
An extendable shock strut comprising: a strut housing having an open end and a closed end; a primary piston including a piston housing and a piston head slidable in said strut housing, said piston housing and said strut housing adapted to move a selected distance relative to one another under normal usage and to provide a shock absorbing action; a secondary piston slidable in said strut housing and positioned between said closed end of said strut housing and said piston head, said secondary piston including a secondary piston head, said secondary piston head and said closed end of said strut housing forming an expandable chamber; and expansion means coupled to said expandable chamber for rapidly expandng said chamber and driving said secondary piston toward said piston head to cause said piston head and said piston housing to move relative to said strut housing to said extended position.
Claim 12
Dependent Claim
147 words
An extendable shock strut comprising: a strut housing having an open end and a closed end; a primary piston including a piston housing and a piston head slidable in said strut housing, said piston housing and said strut housing adapted to move a selected distance relative to one another under normal usage and to provide a shock absorbing action; a secondary piston slidable in said strut housing and positioned between said closed end of said strut housing and said piston head, said secondary piston including a secondary piston head, said secondary piston head and said closed end of said strut housing forming an expandable chamber; and expansion means coupled to said expandable chamber for rapidly expandng said chamber and driving said secondary piston toward said piston head to cause said piston head and said piston housing to move relative to said strut housing to said extended position.
Claim 13
Dependent Claim
20 words
The shock strut of claim 10 wherein said expansion means drives said secondary piston into contact with said piston head.
Claim 14
Dependent Claim
16 words
The shock strut of claim 10 wherein said expansion means is coupled to said strut housing.
Claim 15
Dependent Claim
38 words
The shock strut of claim 10 wherein said expansion means includes a hot gas generator for generating a high temperature, high pressure gas for rapidly driving said piston head and said piston housing relative to said strut housing.
Claim 16
Dependent Claim
26 words
The shock strut of claim 13 wherein said expansion means includes a bleed down valve for releasing said gas after said shock strut has been extended.
Claim 17
Dependent Claim
31 words
The shock strut of claim 10 further comprising stop means for limiting to said extended position the motion of said piston head and said piston housing relative to said strut housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |