US3765990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for side sealing two layers of heat sealable film to complete a package
Assignee: Gerrard Co Ltd
•
Filing: 1971-08-12
•
Granted: 1973-10-16
•
Expires: 1991-08-12
Abstract
Abstract Apparatus for side sealing packages made of plastic films consists of a rotary member having a heated sealing and cutting blade to the side of which is another blade, heated by the first blade, the two blades forming a pair of seals; the blades bear against a moving belt which also supports the package and a pair of upper belts are provided one to each side of the rotary member, these belts working in conjunction on the upper side of the seal to remove any tension thereon during and immediately after sealing.
Inventors
- 👤 W Histed
- 👤 H Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:30
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/74; B29C65/741; B29C65/7411; B29C65/7412; B29C65/745; B29C65/7455; B29C65/749; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/13; B29C66/137; B29C66/20; B29C66/23; B29C66/232; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/80; B29C66/81; B29C66/814; B29C66/8145; B29C66/81463; B29C66/81469; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/84; B29C66/849; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91423; B65; B65B; B65B51/00; B65B51/10; B65B51/16; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81417; B29C66/81421; B29C66/81422; B29C66/832; B29C66/8324; B29C66/83431; B29C66/94; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
Apparatus for the side sealing of two layers of heat sealable film to complete a package, said apparatus including a rotary sealing and cutting member formed of a first, circular, heated sealing and cutting disc and a second circular heat sealing disc located to the side of the first mentioned disc nearer said package and having a diameter less than that of said first mentioned disc, said second disc being heated by heat transfer from said first disc; a pair of upper belts located one to each side of said rotary sealing and cutting member and each supported by a pair of pulleys, one at each end of each belt; a third, driven, belt of resilient material situated beneath said rotary sealing and cutting member and said pair of upper belts; and resilient means co-operative with said rotary sealing and cutting member to press said sealing and cutting member and said pair of upper belts against said third belt.
Claim 2
Dependent Claim
159 words
Apparatus for the side sealing of two layers of heat sealable film to complete a package, said apparatus including a rotary sealing and cutting member formed of a first, circular, heated sealing and cutting disc and a second circular heat sealing disc located to the side of the first mentioned disc nearer said package and having a diameter less than that of said first mentioned disc, said second disc being heated by heat transfer from said first disc; a pair of upper belts located one to each side of said rotary sealing and cutting member and each supported by a pair of pulleys, one at each end of each belt; a third, driven, belt of resilient material situated beneath said rotary sealing and cutting member and said pair of upper belts; and resilient means co-operative with said rotary sealing and cutting member to press said sealing and cutting member and said pair of upper belts against said third belt.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1 wherein said third belt is made of asbestos fibre.
Claim 4
Dependent Claim
70 words
Apparatus according to claim 1 wherein said rotary sealing and cutting member and said pair of upper belts are supported from plate means, and where pivotable means are associated with said plate means, and including means to cause pivoting action of said plate means against the force of said resilient means to raise said rotary sealing and cutting member and said pair of upper belts away from said third belt.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |