US3779123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife holder and knife therefor
Assignee: Cumberland Engineering Corp
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Filing: 1972-10-16
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Granted: 1973-12-18
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Expires: 1992-10-16
Abstract
Abstract A knife holder and knife therefor to be used on a machine for dicing or cutting plastics, the knife holder being an elongated body having a channel therein, the channel being shaped to hold an elongated insertable knife blade against the front wall of the channel, and an elongated wedge mounted between the knife and the back wall of the channel to clamp the knife securely in the knife holder. The walls of the channel are divergent from each other. The cooperation between the knife, wedge, and front and back walls of the channel is such that wedge-fastening screws or bolts have reduced forces acting on them. In a second embodiment, means are also provided whereby regound or replacement knives may be fitted into the knife holder with a minimum of adjustment necessary in respect to the fly knives of the machine.
Inventors
- 👤 G Chafee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:30
CPC Classifications
B; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/25; B26D1/34; B26D1/38; B26D7/00; B26D7/26; B26D7/2614; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4847; Y10T83/485; Y10T83/494; Y10T83/501; Y10T83/929; Y10T83/9457; Y10T83/9464; Y10T83/9493
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
241 words
In combination, an elongated knife holder and a knife therefor for a cutting machine having rotary cutters with which the knife is adapted to cooperate, the holder having a top surface and a front surface and being provided with a channel therein to receive the knife; the channel having a bottom surface, a front wall and a back wall contiguous with said bottom surface, the front wall and the back wall being inclined away from each other at a predetermined angle, the front wall being at an obtuse angle to the plane of the bottom surface, and the back wall being at an acute angle to the plane of the bottom surface; a first portion of the bottom surface being approximately parallel to the top surface; a second portion of the bottom surface lying at an angle to the first portion of the bottom surface and sloping downwardly and toward the front surface of the holder; a knife lying in said channel with one side thereof against the front wall thereof, the other side of the knife facing toward the back wall, and the bottom surface of the knife seated against the second portion of the bottom surface of the channel; and a wedge removably and adjustably fastened into the channel between the knife and the back wall by fastening means and engaging the back wall and said other side of the knife thereby to hold the knife in the channel.
Claim 2
Dependent Claim
241 words
In combination, an elongated knife holder and a knife therefor for a cutting machine having rotary cutters with which the knife is adapted to cooperate, the holder having a top surface and a front surface and being provided with a channel therein to receive the knife; the channel having a bottom surface, a front wall and a back wall contiguous with said bottom surface, the front wall and the back wall being inclined away from each other at a predetermined angle, the front wall being at an obtuse angle to the plane of the bottom surface, and the back wall being at an acute angle to the plane of the bottom surface; a first portion of the bottom surface being approximately parallel to the top surface; a second portion of the bottom surface lying at an angle to the first portion of the bottom surface and sloping downwardly and toward the front surface of the holder; a knife lying in said channel with one side thereof against the front wall thereof, the other side of the knife facing toward the back wall, and the bottom surface of the knife seated against the second portion of the bottom surface of the channel; and a wedge removably and adjustably fastened into the channel between the knife and the back wall by fastening means and engaging the back wall and said other side of the knife thereby to hold the knife in the channel.
Claim 3
Dependent Claim
52 words
The combination of claim 1 in which the front surface of the holder terminates short of its top surface, and said knife is so formed that when the latter is clamped in the holder, an upper forward edge portion thereof is exposed and lies adjacent the cutting path of said rotary knives.
Claim 4
Dependent Claim
42 words
The combination of claim 1 in which the angle of slope of the second portion of the bottom surface of the channel is the same as the angle that the bottom surface of the knife makes with the sides of the knife.
Claim 5
Dependent Claim
23 words
The combination of claim 3 in which the angle the bottom surface of the knife makes with the walls thereof is approximately 90*.
Claim 6
Dependent Claim
52 words
The combination of claim 1 in which the angle that the back wall of the channel makes with the plane of the bottom surface of the latter is approximately 60*, and the angle the front wall of the channel makes with the plane of the bottom of the latter is approximately 135*.
Claim 7
Dependent Claim
38 words
The combination of claim 2 in which the upper forward edge portion of said knife is provided with first teeth and the front surface of the holder is provided with second teeth in alignment with said first teeth.
Claim 8
Dependent Claim
54 words
The combination of claim 6 in which the total width of said knife from its forwardmost cutting point to its bottom surface is such that when the knife is seated against the second bottom portion of the channel, the teeth of the knife and of the front surface of the holder are in alignment.
Claim 9
Dependent Claim
48 words
The combination of claim 7 in which the knife comprises a body and a layer of additional spacer material of predetermined thickness attached to the bottom surface of the body, the total width of the knife including the width of the knife per se and said predetermined thickness.
Claim 10
Dependent Claim
183 words
An elongated knife holder for a knife, the holder having a top surface and a front surface and being provided with a channel therein to receive a knife longitudinally; the channel having a bottom surface, a front wall and a back wall contiguous with said bottom surface, the front wall and the back wall being inclined away from each other at a predetermined angle, the front wall being at an obtuse angle to the plane of the bottom surface, and the back wall being at an acute angle to the plane of the bottom surface; a first portion of the bottom surface being approximately parallel to the top surface; a second portion of the bottom surface lying at an angle to the first portion of the bottom surface and sloping downwardly toward said front surface; and a wedge adapted to be removably and adjustably fastened into the channel by fastening means and adapted to engage said back wall and one side of tHe knife when the latter is in the channel thereby to force the knife against the front wall of the channel.
Claim 11
Dependent Claim
183 words
An elongated knife holder for a knife, the holder having a top surface and a front surface and being provided with a channel therein to receive a knife longitudinally; the channel having a bottom surface, a front wall and a back wall contiguous with said bottom surface, the front wall and the back wall being inclined away from each other at a predetermined angle, the front wall being at an obtuse angle to the plane of the bottom surface, and the back wall being at an acute angle to the plane of the bottom surface; a first portion of the bottom surface being approximately parallel to the top surface; a second portion of the bottom surface lying at an angle to the first portion of the bottom surface and sloping downwardly toward said front surface; and a wedge adapted to be removably and adjustably fastened into the channel by fastening means and adapted to engage said back wall and one side of tHe knife when the latter is in the channel thereby to force the knife against the front wall of the channel.
Claim 12
Dependent Claim
22 words
The holder of claim 9 in which the front surface of the holder terminates short of the top surface of the latter.
Claim 13
Dependent Claim
42 words
The combination of claim 9 in which the angle of slope of the second portion of the bottom surface of the channel is the same as the angle that the bottom surface of the knife makes with the sides of the knife.
Claim 14
Dependent Claim
43 words
The combination of claim 9 in which the angle the back wall makes with the plane of the bottom surface is approximately 60*, and the angle the front wall of the channel makes with the plane of the bottom surface is approximately 135*.
References Cited (Backward Citations)
US3491636A
Cited
US3709077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |