US3753640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming system components of extruded hollow chamber profiles
Assignee: Individual
•
Filing: 1971-09-03
•
Granted: 1973-08-21
•
Expires: 1991-09-03
Abstract
Abstract This disclosure teaches a structural system with extruded plastic members having hollow (preferably rectangular) profiles with their ends open. Connecting plugs are provided for engagement into the open ends for attachment to the members. Embossed toothing at the open ends interfacing the plugs and the members secure their attachment. Embossing devices are used to emboss the toothing on the internal and external surfaces.
Inventors
- 👤 H Duepree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:16
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/02; B29C59/021; B29C57/00; B29L; B29L2031/00; B29L2031/001; B29L2031/003
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
A device for embossing toothing onto an inner wall of an extruded plastic member having a hollow profile with an open end, the device comprising in combination: spreading wedges insertable into the open end in contact with the wall, means for heating the inner wall to soften it, means for pressing the spreading wedges against the softened inner wall to emboss the toothing thereon, lifting means for lifting the spreading wedges from the inner wall, means for removing the spreading wedges from the open end, stabilizing means provided at the outside of the wall to be embossed, said stabilizing means movable toward and from the wall to be embossed and on contacting said wall reenforcing same to prevent bending thereof on embossing.
Claim 2
Independent Claim
122 words
A device for embossing toothing onto an inner wall of an extruded plastic member having a hollow profile with an open end, the device comprising in combination: spreading wedges insertable into the open end in contact with the wall, means for heating the inner wall to soften it, means for pressing the spreading wedges against the softened inner wall to emboss the toothing thereon, lifting means for lifting the spreading wedges from the inner wall, means for removing the spreading wedges from the open end, stabilizing means provided at the outside of the wall to be embossed, said stabilizing means movable toward and from the wall to be embossed and on contacting said wall reenforcing same to prevent bending thereof on embossing.
Claim 3
Dependent Claim
15 words
The device of claim 1, in which the stabilizing means are provided with cooling means.
References Cited (Backward Citations)
BE566760A
Cited
US1352418A
Cited
US3130412A
Cited
US3425093A
Cited
US3349599A
Cited
US3384695A
Cited
US3478144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |