US3762255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for piercing thin sheet material
Assignee: Glad Products Co
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Filing: 1971-10-20
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Granted: 1973-10-02
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Expires: 1991-10-20
Abstract
Abstract A method and apparatus for piercing thin sheet material, such as plastic film, is provided wherein the sheet material is passed between a piercing member having a plurality of independently resilient protrusions extending therefrom and a backing member having a retiform exterior surface, said piercing member or said backup member being moved relative to the other member, thereby causing said resilient protrusions to follow said retiform surface and selectively pierce said film.
Inventors
- 👤 D Clash
- 👤 T Kozak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:13
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/18; B26F1/20; A; A41; A41B; A41B17/00; A61; A61F; A61F13/00; A61F13/00987; A61F13/00991; A61F13/00995; B29; B29D; B29D19/00; B29D19/04; A61F2013/00089; A61F2013/00246; A61F2013/00251; A61F2013/00361; A61F2013/00855; A61F2013/00859; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4728; Y10T83/4731; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4844; Y10T83/929; Y10T83/9314; Y10T83/9372; Y10T83/9408
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
An apparatus for introducing a plurality of apertures in a film comprising a piercing member having a plurality of independently resilient protrusions extending therefrom, a backup member having a retiform exterior surface constituting camming tracks for said protrusions, support means for said piercing member, means to impart relative motion between said backup member and said piercing member, and means urging said piercing member and said backup member into adjacency thereby causing said protrusions to track in said camming tracks during relative motion between said piercing member and said backup member.
Claim 2
Independent Claim
90 words
An apparatus for introducing a plurality of apertures in a film comprising a piercing member having a plurality of independently resilient protrusions extending therefrom, a backup member having a retiform exterior surface constituting camming tracks for said protrusions, support means for said piercing member, means to impart relative motion between said backup member and said piercing member, and means urging said piercing member and said backup member into adjacency thereby causing said protrusions to track in said camming tracks during relative motion between said piercing member and said backup member.
Claim 3
Dependent Claim
15 words
The apparatus in accordance with claim 1 wherein said piercing member is a metal comb.
Claim 4
Dependent Claim
15 words
The apparatus in accordance with claim 1 wherein said piercing member is a wire brush.
Claim 5
Dependent Claim
38 words
The apparatus in accordance with claim 1 wherein said piercing member is a metal strip having a plurality of substantially parallel slits extending from one edge thereof in the direction of the opposite edge thereby defining said protrusions.
Claim 6
Dependent Claim
16 words
The apparatus in accordance with claim 1 wherein said backup member has an undulant exterior surface.
Claim 7
Dependent Claim
15 words
The apparatus in accordance with claim 1 wherein said backup member is a wire screen.
Claim 8
Dependent Claim
29 words
The apparatus in accordance with claim 1 wherein said backup member is in the form of an endless belt which is driven longitudinally with respect to said piercing member.
Claim 9
Dependent Claim
17 words
The apparatus in accordance with claim 1 wherein said backup member is secured to a rotatable drum.
Claim 10
Independent Claim
103 words
An apparatus for introducing a plurality of apertures in a thermoplastic film comprising a piercing member having a plurality of independently resilient teeth extending therefrom, a backup member which is a wire screen secured to a drum, drive means in combination with said drum to rotate said drum relative to said piercing member, and support means for said piercing member maintaining at least a plurality of the teeth of said piercing member in adjacency with said screen such that said teeth will individually track the undulations of said screen during rotation of said drum and selectively perforate a film positioned on said drum.
Claim 11
Independent Claim
103 words
An apparatus for introducing a plurality of apertures in a thermoplastic film comprising a piercing member having a plurality of independently resilient teeth extending therefrom, a backup member which is a wire screen secured to a drum, drive means in combination with said drum to rotate said drum relative to said piercing member, and support means for said piercing member maintaining at least a plurality of the teeth of said piercing member in adjacency with said screen such that said teeth will individually track the undulations of said screen during rotation of said drum and selectively perforate a film positioned on said drum.
Claim 12
Independent Claim
96 words
A method of introducing a plurality of apertures in a film comprising supplying said film to a perforating area, passing said film between the nip of a plurality of resilient teeth and a retiform surface against which said teeth are held in adjacency at said perforating area and moving said film through said perforating area in a manner such that said teeth follow said retiform surface perforating said film when the teeth engage the higher portions of said surface anD allowing said film to pass unperforated when the teeth engage the lower portions of said surface.
Claim 13
Independent Claim
96 words
A method of introducing a plurality of apertures in a film comprising supplying said film to a perforating area, passing said film between the nip of a plurality of resilient teeth and a retiform surface against which said teeth are held in adjacency at said perforating area and moving said film through said perforating area in a manner such that said teeth follow said retiform surface perforating said film when the teeth engage the higher portions of said surface anD allowing said film to pass unperforated when the teeth engage the lower portions of said surface.
References Cited (Backward Citations)
US2980982A
Cited
US2870840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |