US3748704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamp for biaxial stretching machines
Assignee: Erwin Kampf GmbH and Co Maschinenfabrik
•
Filing: 1972-01-04
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Granted: 1973-07-31
•
Expires: 1992-01-04
Abstract
Abstract A clamp having means for clamping a film to be biaxially stretched has means, generally vertically aligned with the clamping means, for engagement by a driving member to thereby minimize twisting torques about a vertical axis. The clamp further has opposed and longitudinally spaced rollers engaging a guide rail to resist any tendency for the clamp to twist on the guide rail.
Inventors
- 👤 W Schmidt
- 👤 R Berzbach
- 👤 K Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:04
CPC Classifications
D; D06; D06C; D06C3/00; D06C3/02; D06C3/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A clamp for engagement with a one-piece guide rail of biaxial stretching apparatus, said clamp comprising: a U-shaped body portion comprising two arms joined by a bridging member; a clamping surface attached to said bridging member and means for clamping a film onto said surface; a drive roller located so as, in operation, to be substantially vertically below said surface; at least one guide roller attached to said body portion so as, in operation, to engage with at least one guide face of said rail, said face running parallel with said film; and rollers mounted on said arms so as, in operation, to engage with two surfaces of said rail perpendicular to said film, at least one roller on each arm engaging with each said surface and each roller on one arm being displaced along the direction of travel of said clamp relative to the roller on the other arm engaging the same surface.
Claim 2
Dependent Claim
154 words
A clamp for engagement with a one-piece guide rail of biaxial stretching apparatus, said clamp comprising: a U-shaped body portion comprising two arms joined by a bridging member; a clamping surface attached to said bridging member and means for clamping a film onto said surface; a drive roller located so as, in operation, to be substantially vertically below said surface; at least one guide roller attached to said body portion so as, in operation, to engage with at least one guide face of said rail, said face running parallel with said film; and rollers mounted on said arms so as, in operation, to engage with two surfaces of said rail perpendicular to said film, at least one roller on each arm engaging with each said surface and each roller on one arm being displaced along the direction of travel of said clamp relative to the roller on the other arm engaging the same surface.
Claim 3
Dependent Claim
32 words
A clamp according to claim 1, in which each roller on one arm is displaced along the direction of travel of said clamp relative to the other roller on the same arm.
Claim 4
Dependent Claim
43 words
A clamp according to claim 1, comprising two of said guide rollers attached so as, in operation, to engage with the parallel guide face of said rail, the axes of said rollers lying in a plane parallel to the plane of said film.
References Cited (Backward Citations)
US1478454A
Cited
US3221416A
Cited
GB1067872A
Cited
GB1136709A
Cited
US3247544A
Cited
US3580451A
Cited
US3638289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |