US3875835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct board cutting apparatus and method
Assignee: Johns Manville Corp
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Filing: 1973-04-23
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Granted: 1975-04-08
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Expires: 1993-04-23
Abstract
Abstract Duct boards, from a stack of duct boards, are properly aligned for feed into a cutting station and are successively fed from the feed station to the cutting station. Once in the cutting station the duct board is fed and guided between knife blades and a backing roll which cut the duct as required for a particular application. Drawing apparatus, rearward of the knife blades and the backing roll, draw the duct board through the knife blades and the backing roll while maintaining the duct board in proper alignment for the cutting operation throughout a major portion of the cutting operation.
Inventors
- 👤 Edwin E Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:23
CPC Classifications
B; B23; B23D; B23D3/00; B23D3/04; B23D3/06; B26; B26D; B26D3/00; B26D3/08; Y; Y10; Y10T; Y10T409/00; Y10T409/50; Y10T409/502624; Y10T409/504756; Y10T83/00; Y10T83/02; Y10T83/0304
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
365 words
Duct board cutting apparatus comprising; cutting station means for cutting a board composed of fibrous material, said cutting station means including a knife blade means affixed to a support of the apparatus and backing roll means rotatably mounted on said apparatus beneath said knife blade means, said knife blade means contacting said backing roll means rearward of leading cutting edges of said knife blade means whereby a facing on a duct board can pass between said knife blade means and said backing roll without being severed, means for rotating said backing roll, means forward of said knife blade means and said backing roll for feeding and guiding board between said knife blade means and said backing roll means, feed station means for automatically feeding board to said feed and guide means of said cutting station said feed station means including means for aligning said board prior to the feed of said board to said cutting station, and means for guiding said board into said feed and guide means of said cutting station which elevates lateral portions of said board relative to a central portion of said board to flatten said board to prevent said board from becoming jammed during passage into the cutting station, and means rearward of said knife blade means and said backing roll means for drawing board between said knife blade means and said backing roll means and for keeping board in proper alignment for cutting as the board passes between said knife blade means and said backing roll means, said drawing roll means including a first pair and a second pair of rolls which are rotatably mounted on said apparatus on axes extending parallel to the axis of rotation of the backing roll with said first pair being mounted forward of said second pair, said first pair and said second pair of rolls each including an upper roll and a lower roll which lie in a common vertical plane with a lower surface of the upper roll being spaced from an upper suface of the lower roll a distance less than the thickness of the board being cut, and means for rotating said first pair and said second pair of rolls.
Claim 2
Dependent Claim
365 words
Duct board cutting apparatus comprising; cutting station means for cutting a board composed of fibrous material, said cutting station means including a knife blade means affixed to a support of the apparatus and backing roll means rotatably mounted on said apparatus beneath said knife blade means, said knife blade means contacting said backing roll means rearward of leading cutting edges of said knife blade means whereby a facing on a duct board can pass between said knife blade means and said backing roll without being severed, means for rotating said backing roll, means forward of said knife blade means and said backing roll for feeding and guiding board between said knife blade means and said backing roll means, feed station means for automatically feeding board to said feed and guide means of said cutting station said feed station means including means for aligning said board prior to the feed of said board to said cutting station, and means for guiding said board into said feed and guide means of said cutting station which elevates lateral portions of said board relative to a central portion of said board to flatten said board to prevent said board from becoming jammed during passage into the cutting station, and means rearward of said knife blade means and said backing roll means for drawing board between said knife blade means and said backing roll means and for keeping board in proper alignment for cutting as the board passes between said knife blade means and said backing roll means, said drawing roll means including a first pair and a second pair of rolls which are rotatably mounted on said apparatus on axes extending parallel to the axis of rotation of the backing roll with said first pair being mounted forward of said second pair, said first pair and said second pair of rolls each including an upper roll and a lower roll which lie in a common vertical plane with a lower surface of the upper roll being spaced from an upper suface of the lower roll a distance less than the thickness of the board being cut, and means for rotating said first pair and said second pair of rolls.
Claim 3
Dependent Claim
128 words
Duct board cutting apparatus as defined in claim 1 wherein: said feed and guide means forward of said knife blade means and said backing roll includes a third pair of rolls which are rotatably mounted on said apparatus on axes extending parallel to the axis of rotation of the backing roll, said third pair of rolls including an upper roll and a lower roll which lie in a common vertical plane with a lower surface of the upper roll being spaced from an upper surface of the lower roll a distance less than the thickness of the board being cut and greater than the distances between the lower and upper surfaces of the first and second pair of rolls, and means for rotating said third set of rolls.
Claim 4
Dependent Claim
44 words
Duct board cutting apparatus as defined in claim 2 wherein: said means for rotating said third pair of rolls rotates said third pair of rolls with a surface speed equal to the surface speeds of said first pair and said second pair of rolls.
Claim 5
Dependent Claim
44 words
Duct board cutting apparatus as claimed in claim 1 wherein: said feed station means includes means for feeding an uppermost board from a stack of boards into said cutting station, and means for bringing a succeeding board into position to replace said uppermost board.
Claim 6
Dependent Claim
25 words
Duct board cutting apparatus as claimed in claim 4 and further comprising: aligning means for aligning said uppermost board for feed into said cutting station.
Claim 7
Dependent Claim
78 words
Duct board cutting apparatus as claimed in claim 5 wherein: said aligning means comprises a pair of elongate members extending generally parallel to the direction of travel of said board through said apparatus, said elongate members being mounted on said apparatus adjacent sides of said apparatus, and means for moving said elongate members toward each other and in the general direction of travel of said uppermost board as said uppermost board is being fed into said cutting station.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |