US3711054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously adjustable lifting devices
Assignee: Individual
•
Filing: 1970-06-19
•
Granted: 1973-01-16
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Expires: 1990-06-19
Abstract
Abstract A device for the stepless height adjustment of the seat surface member of a chair, stool or the like using a fluid spring member with a tubular housing which simultaneously serves as a part of the supporting column of the chair, stool or the like, the piston rod of the fluid spring member extending downwardly and being mounted with lateral play at its lower end in the base of a guide tube forming another part of the said column.
Inventors
- 👤 F Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:36
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
A continuously adjustable device for adjusting the height particularly of the seat of chairs, stools or the like, comprising a pneumatic spring adjustably mounted in a vertical guide tube of a pillar of the chair or the like, a tubular casing containing a fluid filling and connected to the seat at its upper end, a piston axially movable in said tubular casing mounted on a piston rod emerging at its other end through a seal in said casing, said piston rod being immovably anchored in the bottom of said guide tube, and a lifting device capable of locking the piston in an adjusted position blocking an overflow opening for the above-mentioned filling and having a release pin emerging from the end of the casing connected to the seat, said pin being capable of opening said overflow opening and of connecting the casing space ahead of said piston to the casing space behind said piston via a by-pass chamber, the free end of the solid piston rod (2) being anchored in the bottom of the guide tube for allowing lateral movement but restraining it axially.
Claim 2
Dependent Claim
184 words
A continuously adjustable device for adjusting the height particularly of the seat of chairs, stools or the like, comprising a pneumatic spring adjustably mounted in a vertical guide tube of a pillar of the chair or the like, a tubular casing containing a fluid filling and connected to the seat at its upper end, a piston axially movable in said tubular casing mounted on a piston rod emerging at its other end through a seal in said casing, said piston rod being immovably anchored in the bottom of said guide tube, and a lifting device capable of locking the piston in an adjusted position blocking an overflow opening for the above-mentioned filling and having a release pin emerging from the end of the casing connected to the seat, said pin being capable of opening said overflow opening and of connecting the casing space ahead of said piston to the casing space behind said piston via a by-pass chamber, the free end of the solid piston rod (2) being anchored in the bottom of the guide tube for allowing lateral movement but restraining it axially.
Claim 3
Dependent Claim
79 words
A device according to claim 1, wherein the free end of the piston rod is formed as a stud carrying a thrust bearing supported by the upper side of a bottom closure member of guide tube, the stud extending through an opening in the said bottom, with radial play and being secured against withdrawal and substantially without axial play, by securing means disposed below the said bottom, for example by means of an annular disc and a spring clip.
Claim 4
Dependent Claim
57 words
A device according to claim 1, wherein the said fixing means comprise a hub member of substantially truncated conical shape, having an annular flange enabling its securement to the underside of the seat surface member, the free end of the hub member being constructed as a clamping device for clamping the said one end of the housing.
Claim 5
Dependent Claim
46 words
A device according to claim 1, wherein a double-armed actuating lever is rockably mounted in the conical wall of the hub member, one arm of the lever co-operating with the free end of the release pin, and the other arm being constructed as an actuating handle.
Claim 6
Dependent Claim
90 words
A device according to claim 1 characterized in that for achieving axial restraint and radial mobility the free end of the piston rod (2) is constructed as a pin (14) receiving a thrust ball bearing (16) and passes through the bottom (10 or 15a, respectively) of said guide tube (7) supporting at its inside said thrust ball bearing with radial play, and is secured on the outside of said bottom by means of a ring washer (20) and a circular clip (21) against being pulled out axially, practically without play.
Claim 7
Dependent Claim
62 words
A device according to claim 1 characterized in that for attaining axial restraint and radial mobility a disc-shaped body (12) of elastically resilient material is anchored on the free end (14), constructed as a pin or piston rod (2), which body has on its periphery an annular groove engaging with a beaded margin (11) forming the bottom of the guide tube (7).
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |