Patent US3640668A successfully refreshed from Google Patents.
US3640668A
Expired / Lapsed
US
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Reentrant forming apparatus
Assignee: Packaging Industries Inc
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Filing: 1969-07-24
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Granted: 1972-02-08
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Expires: 1989-07-24
Abstract
Abstract A pair of dies engage a sheet of heat-softened foamed polystyrene plastic at a forming station and form it into a desired shape such as a carton. At the same station, and while the plastic is held between the dies, a portion of the plastic protruding from the dies is engaged on opposite sides by cooperating punches to impart a reentrant formation to the plastic that the dies alone could not impart. The reentrant formation facilitates releasably latching the top and bottom portions of the completed carton in a closed position.
Inventors
- 👤 Fred P Brown Jr
- 👤 Howard A Rohdin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:14
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0048; B29C51/00; B29C51/08; B29C51/082; B29C51/26; B29C51/30; B29C51/32; B29C51/34; B29K; B29K2025/00; B29K2105/00; B29K2105/04; B29L; B29L2031/00; B29L2031/712; B29L2031/7162; B29L2031/7168; Y; Y10; Y10S; Y10S425/00; Y10S425/058
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
In forming apparatus having a pair of dies adapted for relative movement towards each other to impart a predetermined shape to a blank of formable material inserted therebetween and reentrant forming means for imparting a reentrant formation to said blank having said predetermined shape imparted by said dies, the improvement wherein said reentrant forming means comprises a pair of cooperating punches and means mounting said punches for relative movement with respect to each other, the relative movement of said punches with respect to each other being different from the relative movement of said dies with respect to each other and each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch.
Claim 2
Dependent Claim
125 words
In forming apparatus having a pair of dies adapted for relative movement towards each other to impart a predetermined shape to a blank of formable material inserted therebetween and reentrant forming means for imparting a reentrant formation to said blank having said predetermined shape imparted by said dies, the improvement wherein said reentrant forming means comprises a pair of cooperating punches and means mounting said punches for relative movement with respect to each other, the relative movement of said punches with respect to each other being different from the relative movement of said dies with respect to each other and each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch.
Claim 3
Dependent Claim
119 words
In forming apparatus having a pair of dies adapted for relative movement towards each other to impart a predetermined shape to a blank of formable material inserted therebetween and reentrant forming means, the improvement wherein said reentrant forming means comprises a pair of cooperating punches and drive means for moving said punches towards each other, each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch, and said punches being respectively movable towards each other by said drive means in a direction different from the direction of relative movement of said dies towards each other to impart a double reentrant formation to material inserted therebetween.
Claim 4
Dependent Claim
119 words
In forming apparatus having a pair of dies adapted for relative movement towards each other to impart a predetermined shape to a blank of formable material inserted therebetween and reentrant forming means, the improvement wherein said reentrant forming means comprises a pair of cooperating punches and drive means for moving said punches towards each other, each punch having a protruding forming portion and a recessed counterpunch, the forming portion of each punch cooperating with the counterpunch of the other punch, and said punches being respectively movable towards each other by said drive means in a direction different from the direction of relative movement of said dies towards each other to impart a double reentrant formation to material inserted therebetween.
Claim 5
Dependent Claim
53 words
Apparatus according to claim 2, wherein said drive means includes a pair of rotatable shafts and wherein each of said pair of punches is mounted for rotation on a different one of said shafts, whereby said punches arE pivoted upon rotation of said shafts to impart said double reentrant formation to said material.
Claim 6
Dependent Claim
13 words
Apparatus according to claim 3 wherein said shafts are parallel to each other.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |