Patent US3786708A successfully refreshed from Google Patents.
US3786708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punch for corrugated board
Assignee: Milwaukee Tool and Machine Co
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Filing: 1973-02-27
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Granted: 1974-01-22
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Expires: 1993-02-27
Abstract
Abstract Apparatus for slotting corrugated board for box partitions includes a reciprocating punch which is received in the female slotting die and in which a thin liner knife located intermediate the side walls of the male punch and extending from the end wall of the male punch initially contacts and severs the board liners to prevent stretching and tearing of the board by the male punch as the punch engages the board and moves into the female die.
Inventors
- 👤 R Mumper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:00
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/01; B26D1/04; B26D1/06; B26D1/08; B26D1/085; B26F; B26F1/00; B26F1/02; B26F1/14; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4798; Y10T83/483; Y10T83/4836; Y10T83/869; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8834; Y10T83/929; Y10T83/9372; Y10T83/9382; Y10T83/9411; Y10T83/9416; Y10T83/9423; Y10T83/9428; Y10T83/9435
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
In apparatus for cutting paperboard comprising a male punch and a female die adapted to receive said male punch and including means for moving said male punch into said die, and said male punch including side surfaces and an end surface, the improvement comprising liner knife means located intermediate said punch side surfaces and projecting from said end surface to sever portions of the paperboard prior to engagement by said end surface and prevent stretching and tearing of said paperboard by said end surface as it engages the paperboard.
Claim 2
Dependent Claim
89 words
In apparatus for cutting paperboard comprising a male punch and a female die adapted to receive said male punch and including means for moving said male punch into said die, and said male punch including side surfaces and an end surface, the improvement comprising liner knife means located intermediate said punch side surfaces and projecting from said end surface to sever portions of the paperboard prior to engagement by said end surface and prevent stretching and tearing of said paperboard by said end surface as it engages the paperboard.
Claim 3
Dependent Claim
14 words
The improvement of claim 1 wherein said knife means has a saw tooth profile.
Claim 4
Dependent Claim
13 words
The improvement of claim 1 wherein said knife means has a beveled edge.
Claim 5
Dependent Claim
29 words
The improvement of claim 1 wherein said end surface has a slot parallel to the side surfaces of said punch and said liner knife being fixed in said slot.
Claim 6
Dependent Claim
54 words
The improvement of claim 1 wherein said male punch is in the form of a circular ring segment and said knife means projects from the periphery of said segment and wherein said female die is in the form of two spaced die parts which define an annular groove for receiving said circular ring segment.
Claim 7
Dependent Claim
18 words
The improvement of claim 5 wherein said knife means is in the form of a circular ring segment.
Claim 8
Dependent Claim
30 words
The improvement of claim 1 wherein said male punch is mounted for reciprocating movement and said end surface is inclined at an angle to the longitudinal axis of said punch.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |