US4001067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butt welder cutting element temperature control
Assignee: Mobil Oil AS
•
Filing: 1973-03-08
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Granted: 1977-01-04
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Expires: 1993-03-08
Abstract
Abstract This invention relates to butt welding sheets of thermoplastic material. More specifically, this invention relates to an apparatus and a process for performing this operation in an improved manner by controlling the temperature of the means used to heat and cut sections of the thermoplastic material. The apparatus and process of this invention concerns switching means response to the length of the cutting means (the length being proportional to the temperature of the cutting means) which controls a power source used to pass current through the cutting means. The current produces heat due to the electrical resistance of the cutting means whenever the cutting means shortens due to a decrease in temperature. An increase of a predetermined amount in length of the cutting means, due to a proportional temperature increase, deactivates the heating circuit. The cutting means temperature control of this disclosure also includes an insulated enclosure having a gate through which the cutting means passes, the gate being comprised of adjacent sections of a flexible material. The enclosure thus conserves heat and inhibits external air currents from contacting and cooling the cutting means.
Inventors
- 👤 David Emil Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:11
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/90; B29C66/92; B29C66/924; B29C66/9241; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C65/2007; B29C65/2038; B29C65/2046; B29C65/22; B29C65/221; B29C65/222; B29C65/229; B29C65/74; B29C65/741; B29C65/7419; B29C65/743; B29C65/7433; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/818; B29C66/8182; B29C66/81821; B29C66/84; B29C66/853; B65; B65H; B65H19/00; B65H19/10; B65H19/18; B65H19/1842; B65H19/1852; B29C65/78; B29C65/7841; B29C65/7847; B29C66/83; B29C66/832; B29C66/8322; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91421; B29C66/9161; B29C66/91651; B65H2301/00; B65H2301/40; B65H2301/46; B65H2301/461; B65H2301/4615; B65H2301/4617; B65H2301/46172; B65H2301/462; B65H2301/4621; B65H2301/463; B65H2301/4634; B65H2301/464; B65H2301/46412; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1317; Y10T156/1322; Y10T156/17; Y10T156/1702; Y10T156/1712; Y10T156/1715
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
In an apparatus comprising means for feeding a first thermoplastic sheet into the nip of a pair of rolls; drive means operating said rolls drawing said first sheet into proximity to said first sheet and said pair of rolls; clamp means associated with said second sheet; clamp means associated with said first sheet; electrical conductive heating and cutting means proximate to said clamp means movably positioned to pass through both said first and said second sheets, thereby severing said first and second sheets; gate means adopted to allow said heating and cutting means to move in and out of a heat insulating enclosure; and means for contacting the thus severed, hot edges for a time sufficient to weld said first and second edges together; the improvement comprising a gate means which comprises adjacent sections of a flexible material adapted to allow said heating and cutting means to pass through said flexible material comprising said gate, thereby preventing residual thermoplastic build-up.
Claim 2
Dependent Claim
160 words
In an apparatus comprising means for feeding a first thermoplastic sheet into the nip of a pair of rolls; drive means operating said rolls drawing said first sheet into proximity to said first sheet and said pair of rolls; clamp means associated with said second sheet; clamp means associated with said first sheet; electrical conductive heating and cutting means proximate to said clamp means movably positioned to pass through both said first and said second sheets, thereby severing said first and second sheets; gate means adopted to allow said heating and cutting means to move in and out of a heat insulating enclosure; and means for contacting the thus severed, hot edges for a time sufficient to weld said first and second edges together; the improvement comprising a gate means which comprises adjacent sections of a flexible material adapted to allow said heating and cutting means to pass through said flexible material comprising said gate, thereby preventing residual thermoplastic build-up.
Claim 3
Dependent Claim
52 words
An improved apparatus as claimed in claim 1 including a spring extending between one end of said heating and cutting means and a stationary support, thereby producing a spring loading on said heating and cutting means and keeping said heating and cutting means in a taut condition while it elongates and contracts.
Claim 4
Dependent Claim
17 words
An improved apparatus as claimed in claim 1 wherein said gate means is comprised of fiberglass cloth.
Claim 5
Dependent Claim
134 words
In a process for butt welding transverse edges of two sheets of thermoplastic material by transversely cutting said sheets; aligning the transverse cut edges of said sheets; abutting said transverse cut edges in a heated condition; and contacting said abutted heated edges for a time sufficient to weld such together; wherein said cutting and heating are accomplished by passing a heated transversely positioned electrically conductive heating and cutting means sequentially through said sheets prior to abutting such; returning said heating and cutting means through a gate into an insulated enclosure; the improvement which comprises passing said heating and cutting means through a gate means which comprises adjacent sections of a flexible material adapted to allow said heating and cutting means to pass through said flexible material comprising said gate, thereby preventing residual thermoplastic build-up.
Claim 6
Dependent Claim
134 words
In a process for butt welding transverse edges of two sheets of thermoplastic material by transversely cutting said sheets; aligning the transverse cut edges of said sheets; abutting said transverse cut edges in a heated condition; and contacting said abutted heated edges for a time sufficient to weld such together; wherein said cutting and heating are accomplished by passing a heated transversely positioned electrically conductive heating and cutting means sequentially through said sheets prior to abutting such; returning said heating and cutting means through a gate into an insulated enclosure; the improvement which comprises passing said heating and cutting means through a gate means which comprises adjacent sections of a flexible material adapted to allow said heating and cutting means to pass through said flexible material comprising said gate, thereby preventing residual thermoplastic build-up.
Claim 7
Dependent Claim
16 words
An improved process as claimed in claim 4 wherein said gate is comprised of fiberglass cloth.
Claim 8
Dependent Claim
27 words
An improved process as claimed in claim 4 wherein said improvement further comprises spring loading said heating and cutting means thereby maintaining such in a taut condition.
References Cited (Backward Citations)
US2707985A
Cited
US3015600A
Cited
US3135077A
Cited
US3384527A
Cited
US3721801A
Cited
US3586584A
Cited
US3595456A
Cited
US3769124A
Cited
US3834971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |