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US3913901A
Expired / Lapsed
US
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Resilient supporting column of adjustable length
Assignee: Stabilus GmbH
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Filing: 1974-08-12
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Granted: 1975-10-21
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Expires: 1994-08-12
Abstract
Abstract A resilient leg for a stool includes a cylinder normally attached to the seat of the stool and a piston rod attached to a piston in the cylinder and normally attached to the stool base. The two compartments in the cylinder axially separated by the piston are filled with compressed gas and may be connected by a manually operated valve. They are also connected automatically by recesses in the axial inner wall of the cylinder when the piston approaches one of the radial end walls of the cylinder. A helical spring then abuttingly engages the end wall and the piston rod to impede further movement of the piston toward the end wall with a force greater than that exerted by the gas in the absence of the recesses.
Inventors
- 👤 Werner Molders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:54
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/30; B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
344 words
A resilient supporting column of adjustable length comprising: a. an elongated cylinder member having a longitudinal axis, said member including an axial internal wall and axially spaced first and second end walls transverse to said axis, said axial wall and said end walls bounding a sealed cavity in said cylinder member; b. a piston member axially movable in said cavity toward and away from a position spacedly adjacent one of said end walls and axially dividing said cavity into two compartments, 1. said piston member sealingly engaging said internal wall and axially sealing said compartments from each other when moving from said position thereof away from said one end wall; c. a piston rod fastened to said piston member and extending therefrom through said first end wall outward of said cavity; d. first by-pass conduit means for connecting said compartments; e. manually operable valve means in said conduit means for alternatively opening and sealing said conduit means; f. fluid filling said compartments and including a body of gas under pressure higher than atmospheric pressure and biasing said piston rod outward of said cavity when said conduit means is open; g. second by-pass conduit means responsive to axial movement of said piston member into said position for connecting said compartments; h. yieldably resilient means impeding further axial movement of said piston member from said position thereof toward said one end wall while said second by-pass conduit means connect said compartments, 1. said yieldably resilient means including a compression spring axially interposed between said piston member and said one end wall in one of said compartments and engaging said piston member in said position of the piston member, 2. the force of said spring opposing said further axial movement of said piston member from said position toward said one end wall increasing at a rate greater than the rate at which the biasing force of said body of gas would increase during said further axial movement in the absence of said spring and of a connection between said compartments by said first and second conduiT means.
Claim 2
Dependent Claim
344 words
A resilient supporting column of adjustable length comprising: a. an elongated cylinder member having a longitudinal axis, said member including an axial internal wall and axially spaced first and second end walls transverse to said axis, said axial wall and said end walls bounding a sealed cavity in said cylinder member; b. a piston member axially movable in said cavity toward and away from a position spacedly adjacent one of said end walls and axially dividing said cavity into two compartments, 1. said piston member sealingly engaging said internal wall and axially sealing said compartments from each other when moving from said position thereof away from said one end wall; c. a piston rod fastened to said piston member and extending therefrom through said first end wall outward of said cavity; d. first by-pass conduit means for connecting said compartments; e. manually operable valve means in said conduit means for alternatively opening and sealing said conduit means; f. fluid filling said compartments and including a body of gas under pressure higher than atmospheric pressure and biasing said piston rod outward of said cavity when said conduit means is open; g. second by-pass conduit means responsive to axial movement of said piston member into said position for connecting said compartments; h. yieldably resilient means impeding further axial movement of said piston member from said position thereof toward said one end wall while said second by-pass conduit means connect said compartments, 1. said yieldably resilient means including a compression spring axially interposed between said piston member and said one end wall in one of said compartments and engaging said piston member in said position of the piston member, 2. the force of said spring opposing said further axial movement of said piston member from said position toward said one end wall increasing at a rate greater than the rate at which the biasing force of said body of gas would increase during said further axial movement in the absence of said spring and of a connection between said compartments by said first and second conduiT means.
Claim 3
Dependent Claim
67 words
the force of said spring opposing said further axial movement of said piston member from said position toward said one end wall increasing at a rate greater than the rate at which the biasing force of said body of gas would increase during said further axial movement in the absence of said spring and of a connection between said compartments by said first and second conduiT means.
Claim 4
Dependent Claim
67 words
the force of said spring opposing said further axial movement of said piston member from said position toward said one end wall increasing at a rate greater than the rate at which the biasing force of said body of gas would increase during said further axial movement in the absence of said spring and of a connection between said compartments by said first and second conduiT means.
Claim 5
Dependent Claim
23 words
A column as set forth in claim 1, wherein said body of gas occupies at least a portion of each of said compartments.
Claim 6
Dependent Claim
18 words
A column as set forth in claim 2, wherein said one end wall is said second end wall.
Claim 7
Dependent Claim
33 words
A column as set forth in claim 2, wherein said axial internal wall is formed with at least one axially elongated groove, said at least one groove constituting said second bypass conduit means.
Claim 8
Dependent Claim
40 words
A column as set forth in claim 2, wherein an axial portion of said internal wall radially aligned with said piston member in said position of the latter is of a diameter sufficient radially to bound said second conduit means.
Claim 9
Dependent Claim
15 words
A column as set forth in claim 2, wherein said spring helical about said axis.
Claim 10
Dependent Claim
51 words
A column as set forth in claim 6, wherein the axial length of said helical spring in the relaxed condition is approximately equal to the axial spacing of said piston member from said one end wall when said piston member enters said position thereof while moving toward said one end wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |