US3907186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-spreader
Assignee: Individual
•
Filing: 1972-07-24
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Granted: 1975-09-23
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Expires: 1992-07-24
Abstract
Abstract Apparatus and method for maintaining uniform tension in a travelling web by feeding the web around a hinged spreading member disposed transversely of the web, resiliently biassing at least a terminal portion of the spreading member into cooperating engagement with at least a marginal portion of the web and withdrawing the web against the biassing influence of the terminal portion.
Inventors
- 👤 Robin Hasler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:50
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/02; B29; B29C; B29C67/00; B29D; B29D7/00; B65H2301/00; B65H2301/40; B65H2301/41; B65H2301/414; B65H2301/4148
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
A method of maintaining substantially uniform longitudinal tension in a travelling web which comprises feeding the web around a hinged spreading member disposed transversely of the web, said spreading member comprising a body member and a terminal member extending from and hingedly connected to an end of the body member, resiliently biassing at least said terminal member into cooperating engagement with at least a marginal zone of the web, so that the terminal member is capable of adopting varying angular positions relative to the body member to maintain the desired web tension, and withdrawing the web from the spreading member against the biassing influence of the terminal member.
Claim 2
Independent Claim
108 words
A method of maintaining substantially uniform longitudinal tension in a travelling web which comprises feeding the web around a hinged spreading member disposed transversely of the web, said spreading member comprising a body member and a terminal member extending from and hingedly connected to an end of the body member, resiliently biassing at least said terminal member into cooperating engagement with at least a marginal zone of the web, so that the terminal member is capable of adopting varying angular positions relative to the body member to maintain the desired web tension, and withdrawing the web from the spreading member against the biassing influence of the terminal member.
Claim 3
Independent Claim
109 words
A method of maintaining substantially uniform longitudinal tension in a travelling web having an overturned edge flap comprising unfolding the overturned edge flap, feeding the unfolded web around a hinged spreading member disposed transversely of the web, said spreading member comprising a body member and a terminal member extending from and hingedly connected to an end of the body member, resiliently biassing said terminal member into cooperating engagement with the unfolded edge flap, so that the terminal member is capable of adopting varying angular positions relative to the body member to maintain the desired web tension, and withdrawing the unfolded web against the biassing influence of the terminal member.
Claim 4
Independent Claim
109 words
A method of maintaining substantially uniform longitudinal tension in a travelling web having an overturned edge flap comprising unfolding the overturned edge flap, feeding the unfolded web around a hinged spreading member disposed transversely of the web, said spreading member comprising a body member and a terminal member extending from and hingedly connected to an end of the body member, resiliently biassing said terminal member into cooperating engagement with the unfolded edge flap, so that the terminal member is capable of adopting varying angular positions relative to the body member to maintain the desired web tension, and withdrawing the unfolded web against the biassing influence of the terminal member.
Claim 5
Dependent Claim
42 words
A method according to claim 2 in which the unfolded web is fed around the hinged spreading member so that the junction between the edge flap and the remainder of the web contacts the spreading member in the region of the hinge.
Claim 6
Dependent Claim
23 words
A method according to claim 2 in which a thin cushion of gaseous fluid is maintained between the web and the spreading member.
Claim 7
Dependent Claim
40 words
A method according to claim 2 in which the junction between the edge flap and the remainder of the web is positioned relative to the hinged region of the spreading member by sliding the spreading member transversely of the web.
Claim 8
Dependent Claim
48 words
A method according to claim 2 in which the terminal member is so biassed that all elements of the web travel over paths of substantially equal lengths from the point at which the edge flap begins to unfold to the point at which the flap is completely unfolded.
Claim 9
Dependent Claim
108 words
Apparatus for equalizing the longitudinal tension in a continuous travelling web comprising a hinged spreading member to be disposed transversely of the web, means for feeding the web around the spreading member and means for withdrawing the web from the spreading member, wherein the spreading member comprises a body member, a terminal member extending from and hingedly connected to an end of the body member and means for resiliently biassing at least said terminal member into tensioning engagement with at least a marginal zone of the web, said terminal member being capable of adopting varying angular positions relative to the body member to maintain the desired web tension.
Claim 10
Dependent Claim
108 words
Apparatus for equalizing the longitudinal tension in a continuous travelling web comprising a hinged spreading member to be disposed transversely of the web, means for feeding the web around the spreading member and means for withdrawing the web from the spreading member, wherein the spreading member comprises a body member, a terminal member extending from and hingedly connected to an end of the body member and means for resiliently biassing at least said terminal member into tensioning engagement with at least a marginal zone of the web, said terminal member being capable of adopting varying angular positions relative to the body member to maintain the desired web tension.
Claim 11
Dependent Claim
35 words
Apparatus according to claim 7 in which the terminal member is hingedly connected for pivotal movement in a plane substantially parallel to that along which the web is to be withdrawn from the spreading member.
Claim 12
Dependent Claim
46 words
Apparatus according to claim 7 in which the spreading member comprises a body member to engage and support an innermost section of the travelling web, and a terminal member hingedly connected to each end of the body member to engage respective edge sections of the web.
Claim 13
Dependent Claim
28 words
Apparatus according to claim 7 in which the surface of the terminal member is perforated to allow gaseous fluid to discharge from the interior of the body member.
Claim 14
Dependent Claim
23 words
Apparatus according to claim 7 in whiCh a resilient plug is provided in the hinged joint between the body member and terminal member.
Claim 15
Dependent Claim
31 words
Apparatus according to claim 7 in which a jet is provided to deliver a continuous stream of gaseous fluid against the surface of the unfolded web which contacts the terminal member.
Claim 16
Dependent Claim
16 words
Apparatus according to claim 7 in which the spreading member is slidable transversely of the web.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |