US3810420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machines for the manufacture of plastic bags
Assignee: SOFAMECA Sarl
•
Filing: 1973-04-10
•
Granted: 1974-05-14
•
Expires: 1993-04-10
Abstract
Abstract A bag making machine for making plastic bags, gussetted or nongussetted, from lay-flat plastics tubing in which the tubing is sealed and cut into bags and stacked on a pivotable platform by being clamped under an extension of the lower sealing jaw. This jaw extension has a sealing electrode energized to seal the various bags of the stack to one another.
Inventors
- 👤 L Ravel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:59
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; B29C65/00; B29C65/02; B29C65/18; B29C65/22; B29C65/221; B29C65/224; B29C65/74; B29C65/745; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/81; B29C66/816; B29C66/8161; B31; B31B; B31B2155/00; B31B2155/003; B31B2160/00; B31B2160/10; B31B70/00; B31B70/60; B31B70/64; B31B70/643; B31B70/74; B31B70/92; B31B70/98; B31B70/988
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
In a machine for the manufacture of plastic bags from a layflat tubing of the type comprising means for longitudinally and cyclically displacing the lay-flat tubing, two transverse sealing jaws, of which the lower is fixed and has a front extension, means for cutting off each manufactured bag, a disengagement jaw which exerts a downward push on each manufactured bag bringing the free end of this bag to below the lower face of the front extension of the fixed jaw, and a platform which is hinged for swinging downwards under the action of the disengagement jaw and has its rear end located below the said front extension and biased upwardly thereagainst to immobilize the manufactured bags by a pinching action, the improvement comprising a sealing electrode projecting from the lower face of the said front extension of the fixed transverse sealing jaw and means for energizing said electrode to seal each manufactured bag to any other bags already stocked on the platform when the platform returns to its initial position.
Claim 2
Dependent Claim
170 words
In a machine for the manufacture of plastic bags from a layflat tubing of the type comprising means for longitudinally and cyclically displacing the lay-flat tubing, two transverse sealing jaws, of which the lower is fixed and has a front extension, means for cutting off each manufactured bag, a disengagement jaw which exerts a downward push on each manufactured bag bringing the free end of this bag to below the lower face of the front extension of the fixed jaw, and a platform which is hinged for swinging downwards under the action of the disengagement jaw and has its rear end located below the said front extension and biased upwardly thereagainst to immobilize the manufactured bags by a pinching action, the improvement comprising a sealing electrode projecting from the lower face of the said front extension of the fixed transverse sealing jaw and means for energizing said electrode to seal each manufactured bag to any other bags already stocked on the platform when the platform returns to its initial position.
Claim 3
Dependent Claim
25 words
The improvement of claim 1, wherein said energizing means is adapted to energize the sealing electrode only while the sealing and disengagement jaws are rising.
Claim 4
Dependent Claim
20 words
The improvement of claim 1, further including a perforator means for forming a transversely extending perforation line across each bag.
Claim 5
Dependent Claim
16 words
The improvement of claim 3, wherein said perforator means is located ahead of said sealing jaws.
Claim 6
Dependent Claim
33 words
The improvement of claim 3, wherein said perforator means comprise a movable perforator jaw, perforator pins on said movable perforator jaw and a fixed perforator jaw co-operable with said perforator jaw and pins.
References Cited (Backward Citations)
US3287195A
Cited
US3587410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |