Patent US3904243A successfully refreshed from Google Patents.
US3904243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberglass shell construction with screw anchor inserts
Assignee: KRUEGER Inc A CORP OF WI
•
Filing: 1974-09-23
•
Granted: 1975-09-09
•
Expires: 1994-09-23
Abstract
Abstract A fiberglass seat shell construction includes plastic inserts which form screw anchors molded in place in protrusions in the lower surface of the seat shell, which inserts have an aperture for threadably receiving self-threading screws which fasten the leg assembly to the seat shell. The inserts have a shank portion which has hexagonal surfaces to prevent rotation of the insert, an upper flange to prevent withdrawal of the insert from the seat shell, and a lower flange which has a planar surface for clamping engagement with the leg assembly under screw pressure and in which the lower flange has a tapered periphery which provides a lead-in surface for proper positioning of the inserts in mold recesses which form the protrusions.
Inventors
- 👤 George A Kostelec
- 👤 Richard J Resch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:03
CPC Classifications
A; A47; A47C; A47C5/00; A47C5/12; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10S297/00; Y10S297/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
In a molded fiberglass seat shell construction having a seat portion with a lower surface the improvement comprising a plurality of protrusions on the lower surface of said seat shell, each of said protrusions including cavity fastening elements having an exposed first portion and a second portion confined in said cavities, said fastening elements having a shank portion and upper and lower laterally-extending flanges, said shank portion and said upper flange comprising said second portion confined in said cavity and said lower flange comprising said second portion, and wherein said protrusion and said lower flange have complementary tapered surfaces which decrease in radius toward the lower surface of said lower flange, and an aperture in said fastening elements for receiving screws, and wherein said shank portion has angularly related surfaces to prevent rotation of said fastening elements in said cavities.
Claim 2
Dependent Claim
140 words
In a molded fiberglass seat shell construction having a seat portion with a lower surface the improvement comprising a plurality of protrusions on the lower surface of said seat shell, each of said protrusions including cavity fastening elements having an exposed first portion and a second portion confined in said cavities, said fastening elements having a shank portion and upper and lower laterally-extending flanges, said shank portion and said upper flange comprising said second portion confined in said cavity and said lower flange comprising said second portion, and wherein said protrusion and said lower flange have complementary tapered surfaces which decrease in radius toward the lower surface of said lower flange, and an aperture in said fastening elements for receiving screws, and wherein said shank portion has angularly related surfaces to prevent rotation of said fastening elements in said cavities.
Claim 3
Dependent Claim
23 words
The improvement of claim 1 wherein said seat shell has an excess of randomly oriented fibers in said shell adjacent to said protrusions.
Claim 4
Dependent Claim
25 words
The improvement of claim 1 wherein said tapered surfaces on said protrusions and said tapered surfaces on said lower flanges provide a smooth continuous surface.
Claim 5
Dependent Claim
41 words
The improvement of claim 1 in combination with a leg assembly with apertures in said legs registrable with said apertures in said fastening elements and including screws extending through said apertures in said leg assembly and threaded into said fastening elements.
References Cited (Backward Citations)
US1977876A
Cited
US2810922A
Cited
US2903388A
Cited
US2808875A
Cited
US3025105A
Cited
US3133765A
Cited
US3341251A
Cited
US3587181A
Cited
US3622200A
Cited
US3647260A
Cited
US3669496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |