Patent US3751109A successfully refreshed from Google Patents.
US3751109A
Expired / Lapsed
US
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Method of making a seat shell
Assignee: AL FURNITURE Ltd DU
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Filing: 1971-09-20
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Granted: 1973-08-07
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Expires: 1991-09-20
Abstract
Abstract A method of making a seat shell having an inner and an outer wall with a cavity therebetween, said method including expanding a hollow softened element of thermoplastic synthetic resin material against the internal surfaces of a mould by injecting a gaseous fluid into said hollow softened element, the mould being so shaped that the seat shell produced therefrom has a seat portion and a back rest portion which are integral with each other.
Inventors
- 👤 R Dufton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:31
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/16; A47C5/00; A47C5/04; A47C5/06; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/14; B29C49/00; B29C49/42; B29C49/48; B29C49/54; B29C67/00; B29C67/0048; B29C2049/542; B29C2049/547; B29C33/00; B29C33/44; B29C33/48; B29C33/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
A seat comprising a seat shell and support structure therefor, said seat shell having inner and outer walls of blow moulded thermoplastic synthetic resin material which are integral with each other but which have a space therebetween, the seat shell having integral seat and back rest portions, the outer wall of the seat portion being resilient and having means defining a cavity therein, and a fastening device, secured to the support structure, for fastening the seat shell thereto, said fastening device being located in said cavity and deforming the resilient wall of the latter into a re-entrant shape which prevents withdrawal of the fastening device from the cavity.
Claim 2
Dependent Claim
108 words
A seat comprising a seat shell and support structure therefor, said seat shell having inner and outer walls of blow moulded thermoplastic synthetic resin material which are integral with each other but which have a space therebetween, the seat shell having integral seat and back rest portions, the outer wall of the seat portion being resilient and having means defining a cavity therein, and a fastening device, secured to the support structure, for fastening the seat shell thereto, said fastening device being located in said cavity and deforming the resilient wall of the latter into a re-entrant shape which prevents withdrawal of the fastening device from the cavity.
Claim 3
Dependent Claim
51 words
A seat as claimed in claim 1 in which the fastening device comprises elastomeric means which are disposed between two members, and clamping means which force the two members towards each other so as to compress the elastomeric means and thus force the latter to cause deformation of the resilient wall.
Claim 4
Dependent Claim
30 words
A seat as claimed in claim 1 in which the cavity, when undeformed, has a cylindrical wall which is at right angles to the outer wall of the seat portion.
Claim 5
Dependent Claim
23 words
A seat as claimed in claim 1 in which there are a plurality of the said cavities and of the said fastening devices.
Claim 6
Dependent Claim
175 words
A seat comprising an L-shaped seat shell and support structure therefor, said L-shaped seat shell having inner and outer walls of blow-moulded thermoplastic synthetic resin material which are integral with each other but which have a space therebetween, the seat shell having integral seat and backrest portions, the outer wall of the seat portion being resilient and having means defining a plurality of spaced apart cavities therein, each cavity, when undeformed, having a cylindrical wall which is at right angles to the outer wall of the seat portion, and a plurality of fastening devices, secured to the support structure, for fastening the seat shell thereto, each said fastening device being located in a said cavity and comprising elastomeric means which are disposed between two members, and clamping means which force the two members of each fastening device towards each other so as to compress each elastomeric means and force the latter to deform the respective resilient wall of the cavity into a re-entrant shape which prevents withdrawal of the fastening device from the respective cavity.
Claim 7
Dependent Claim
175 words
A seat comprising an L-shaped seat shell and support structure therefor, said L-shaped seat shell having inner and outer walls of blow-moulded thermoplastic synthetic resin material which are integral with each other but which have a space therebetween, the seat shell having integral seat and backrest portions, the outer wall of the seat portion being resilient and having means defining a plurality of spaced apart cavities therein, each cavity, when undeformed, having a cylindrical wall which is at right angles to the outer wall of the seat portion, and a plurality of fastening devices, secured to the support structure, for fastening the seat shell thereto, each said fastening device being located in a said cavity and comprising elastomeric means which are disposed between two members, and clamping means which force the two members of each fastening device towards each other so as to compress each elastomeric means and force the latter to deform the respective resilient wall of the cavity into a re-entrant shape which prevents withdrawal of the fastening device from the respective cavity.
Claim 8
Dependent Claim
77 words
A seat as claimed in claim 5 in which the outer wall of the seat portion has two grooves therein which are V-shaped in plan and whose apices are disposed adjacent to each other, a tubular metal member located in each said groove, and two straps which are secured to the tubular metal members, each said strap being secured to the outer wall of the seat portion by a said fastening device located in a said cavity.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |