US3933569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool for welding together two plastics films wrapping an object
Assignee: Individual
•
Filing: 1974-03-18
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Granted: 1976-01-20
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Expires: 1994-03-18
Abstract
Abstract A tool for interconnecting by means of welding two webs of a plastics film enclosing a package of goods, said tool comprising two sections arranged to be pressed against one another while securely holding and welding together said film webs and thereafter separate said webs from one another after welding. The tool comprises means arranged to tighten the film around the goods while maintaining the stretch of film web extending from the welding point towards the web supply rolls in a tension-free condition during the welding operation proper so as to ensure a high-quality and durable welding seam.
Inventors
- 👤 Halvor Grasvoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:52
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/01; B29C66/344; B29C65/00; B29C65/02; B29C65/18; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/80; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; B65; B65B; B65B11/00; B65B11/06; B65B11/38; B65B11/40; B65B51/00; B65B51/10; B65B51/26; B65B51/30; B65B51/303; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
An improved tool for interconnecting by means of welding two webs of a weldable and preferably also extensible plastics film enclosing a package of goods, said webs being reeled off two separate supply rolls, said tool comprising two tool sections arranged to be pressed against one another, a face on each tool section being positioned adjacent said goods, a clamping jaw on each said section face, two welding units positioned on one of said sections externally of said clamping jaw as seen from the direction of said goods, and a severing means intermediate said welding units, the improvement comprising an additional pair of clamping jaws on each said tool section, said additional clamping jaws arranged to securely clamp the associated film web at a point between the supply roll of the latter and the intended welding point, and also means for releasing said film from said additional two pairs of clamping jaws immediately after or exactly during the joining together of said tool sections, said welding units being arranged to thereafter initiate the welding operation.
Claim 2
Dependent Claim
175 words
An improved tool for interconnecting by means of welding two webs of a weldable and preferably also extensible plastics film enclosing a package of goods, said webs being reeled off two separate supply rolls, said tool comprising two tool sections arranged to be pressed against one another, a face on each tool section being positioned adjacent said goods, a clamping jaw on each said section face, two welding units positioned on one of said sections externally of said clamping jaw as seen from the direction of said goods, and a severing means intermediate said welding units, the improvement comprising an additional pair of clamping jaws on each said tool section, said additional clamping jaws arranged to securely clamp the associated film web at a point between the supply roll of the latter and the intended welding point, and also means for releasing said film from said additional two pairs of clamping jaws immediately after or exactly during the joining together of said tool sections, said welding units being arranged to thereafter initiate the welding operation.
Claim 3
Dependent Claim
48 words
An improved tool as claimed in claim 1, wherein said clamping jaw pair provided on each said tool section comprises one stationary clamping jaw attached to said tool section and one movable clamping jaw mounted on said tool section for displacement towards and away from said stationary jaw.
Claim 4
Dependent Claim
33 words
An improved tool as claimed in claim 2, comprising a slit for passage of said film, said slit provided between said stationary clamping jaw and the principal portion of the associated tool section.
Claim 5
Dependent Claim
99 words
An improved tool as claimed in claim 2, comprising a piston cylinder, said movable clamping jaw being connected to one end of said piston cylinder, a source of pressurized medium, both ends of said piston cylinder connected to said source of pressurized medium, the piston rod of said piston cylinder being displaceably mounted in its associated tool section for movement in the direction of displacement of said tool section, a sliding piece displaceably mounted in said tool section and supporting said welding units and said severing means, the free end of said piston rod connected to said sliding piece.
Claim 6
Dependent Claim
52 words
An improved tool as claimed in claim 4, comprising a resilient means acting to displace said sliding piece, and a stopper means, said stopper means limiting the distance over which said sliding piece is displaceable through the action of said resilient means to a non-operative position of said welding and severing means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |