US3816216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for joining and cutting sheet materials
Assignee: Kuraray Co Ltd
•
Filing: 1972-01-21
•
Granted: 1974-06-11
•
Expires: 1992-01-21
Abstract
Abstract A method of working thermoplastic sheet materials employs a pair of high frequency electrodes for heating the materials, one of the electrodes having a cutting edge which is lightly applied during the heating operation to bond the sheets together, after which force is applied to sever the sheets by means of the cutting edge. Apparatus is disclosed comprising a pair of rams operative in one direction to press the pair of electrodes together initially under light force, then under pressure stored up in a compression spring and finally to sever the sheets by means of pressure exerted by one of the rams.
Inventors
- 👤 M Takei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:45
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C65/00; B29C65/02; B29C65/04; B29C65/74; B29C65/741; B29C65/7415; B29C65/7416; B29C65/743; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/816; B29C66/8161; B29C66/82; B29C66/824; B29C66/8242; B29C66/83; B29C66/832; B29C66/8322; B29C66/90; B29C66/92; B29C66/924; B29C66/9261; B29C66/92611; B29C66/92613; B29C66/92651; B29C66/92653; B30; B30B; B30B1/00; B30B1/32; B29C66/70; B29C66/71; B29C66/818; B29C66/8187; B29C66/81871; Y; Y10; Y10T; Y10T156/00; Y10T156/12; Y10T156/1313
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
Apparatus for working sheets of thermoplastic sheet materials comprising a pair of high frequency electrode plates, press means for supporting said plates for reciprocatory movement toward and away from each other, said press means including a cylinder and first and second pistons slidable in said cylinder at opposite ends thereof, means to supply working fluid to the interior of said cylinder at the respective ends thereof and also between said pistons for selectively reciprocating each of said pistons, means for directly connecting said first piston with one of said plates for reciprocating movement of said one plate, means for yieldingly connecting said second piston with said one plate for yieldingly urging movement of said one plate towards the other of said plates.
Claim 2
Dependent Claim
122 words
Apparatus for working sheets of thermoplastic sheet materials comprising a pair of high frequency electrode plates, press means for supporting said plates for reciprocatory movement toward and away from each other, said press means including a cylinder and first and second pistons slidable in said cylinder at opposite ends thereof, means to supply working fluid to the interior of said cylinder at the respective ends thereof and also between said pistons for selectively reciprocating each of said pistons, means for directly connecting said first piston with one of said plates for reciprocating movement of said one plate, means for yieldingly connecting said second piston with said one plate for yieldingly urging movement of said one plate towards the other of said plates.
Claim 3
Dependent Claim
28 words
The invention defined in claim 1, wherein said second piston is movable into axial abutment with said first piston while yieldingly urging said movement of said one plate.
Claim 4
Dependent Claim
22 words
The invention defined in claim 1, wherein said means for yieldingly connecting the second piston with the plate includes compression spring means.
Claim 5
Dependent Claim
54 words
The invention defined in claim 1, wherein said means for yieldingly connecting the second piston with the plate includes adjustable stopper means for limiting movement of the second piston in the direction for urging said one plate toward the other plate, whereby the amount of force exerted by said second piston may be limited.
Claim 6
Dependent Claim
41 words
The invention defined in claim 1, wherein the area of said first piston in contact with the supply of working fluid between said pistons is substantially greater than the area of the second piston in contact with fluid between the pistons.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |