US3863994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional roller cutter
Assignee: Jarva Corp
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Filing: 1973-09-24
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Granted: 1975-02-04
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Expires: 1993-09-24
Abstract
Abstract A bidirectional roller cutter assembly adapted to be fixed to the cutter head of a tunneling machine is disclosed. The cutter assembly includes a cutter rotatably mounted on a shaft so that end portions of the shaft project from the cutter. Each of those projecting end portions has a pair of flat faces the planes of which intersect at an angle of 90*. A generally U-shaped saddle having projecting arm portions mounts the shaft so that the cutter is rotatable on the shaft. Each arm of the saddle has a pair of flat faces the planes of which intersect at an angle of 90* and which engage the faces on a projecting end portion of the shaft. The planes defined by the engaged faces define angles of 45* with respect to the mounting face of the saddle and the engaged faces are clamped together by bolts which exert a clamping force having resultants normal to the engaged faces and on both sides of a plane perpendicular to the mounting face. Those resultants ensure that the shaft is securely clamped to the saddle when the cutter is rotated in clockwise or counterclockwise directions, and ensure that the bolts will not be subjected to excessive shear or tensile loads during the cutting operation.
Inventors
- 👤 Trevor Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:21
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/10; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7018; Y10T403/7021; Y10T403/7041
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
136 words
A roller cutter assembly comprising a cutter rotatably mounted on a shaft so that end portions of said shaft project from said cutter, each end portion having first and second flat angularly related faces, a generally U-shaped saddle having projecting arm portions mounting said shaft and having a mounting face adapted to be secured to a cutter head, at least one of said projecting arm portions having first and second flat faces which are non-parallel with respect to each other and with respect to said mounting face and which respectively engage the first and second angularly related faces of an end portion, means for clamping said angularly related faces to said flat faces with a clamping force have resultants normal to the engaged faces and on both sides of a plane perpendicular to said mounting face.
Claim 2
Dependent Claim
136 words
A roller cutter assembly comprising a cutter rotatably mounted on a shaft so that end portions of said shaft project from said cutter, each end portion having first and second flat angularly related faces, a generally U-shaped saddle having projecting arm portions mounting said shaft and having a mounting face adapted to be secured to a cutter head, at least one of said projecting arm portions having first and second flat faces which are non-parallel with respect to each other and with respect to said mounting face and which respectively engage the first and second angularly related faces of an end portion, means for clamping said angularly related faces to said flat faces with a clamping force have resultants normal to the engaged faces and on both sides of a plane perpendicular to said mounting face.
Claim 3
Dependent Claim
15 words
A roller cutter assembly according to claim 1, wherein said resultants are of equal magnitude.
Claim 4
Dependent Claim
25 words
A roller cutter assembly according to claim 1, wherein said clamping means comprises a bolt extending through said end portion and into said arm portion.
Claim 5
Dependent Claim
27 words
A roller cutter assembly according to claim 3, wherein said bolt is subject to substantially pure tensile loads during rolling action of said cutter in either direction.
Claim 6
Dependent Claim
22 words
A roller cutter assembly according to claim 1, wherein said engaged faces define substantially equal angles with respect to said mounting face.
Claim 7
Dependent Claim
15 words
A roller cutter assembly according to claim 5, wherein said angles are at least 45*.
Claim 8
Dependent Claim
19 words
A roller cutter assembly according to claim 3, wherein said bolt bisects the angle included between said engaged faces.
Claim 9
Dependent Claim
18 words
A roller cutter assembly according to claim 7, wherein said bolt is substantially normal to said mounting face.
Claim 10
Dependent Claim
17 words
A roller cutter assembly according to claim 8, wherein said inclined angle does not substantially eXceed 90*.
Claim 11
Dependent Claim
145 words
A roller cutter assembly comprising a cutter rotatably mounted on a shaft so that end portions of said shaft project from said cutter, each end portion having first and second flat faces defining an angle of about 90*, a generally U-shaped saddle having projecting arm portions mounting said shaft and a mounting face adapted to be secured to a cutter head, each projecting arm portion having first and second flat faces which define an angle of about 90* with respect to each other and each of which defines an angle of about 45* with respect to said mounting face, said first and second faces of each of said end portions respectively engaging the first and second faces of each of said arm portions, bolt means clamping said engaged faces together, the axis of said bolt means bisecting the 90* angle defined by said engaged faces.
Claim 12
Dependent Claim
145 words
A roller cutter assembly comprising a cutter rotatably mounted on a shaft so that end portions of said shaft project from said cutter, each end portion having first and second flat faces defining an angle of about 90*, a generally U-shaped saddle having projecting arm portions mounting said shaft and a mounting face adapted to be secured to a cutter head, each projecting arm portion having first and second flat faces which define an angle of about 90* with respect to each other and each of which defines an angle of about 45* with respect to said mounting face, said first and second faces of each of said end portions respectively engaging the first and second faces of each of said arm portions, bolt means clamping said engaged faces together, the axis of said bolt means bisecting the 90* angle defined by said engaged faces.
Claim 13
Dependent Claim
40 words
A roller cutter assembly according to claim 10, wherein each of said end portions has a third flat face parallel to said mounting face and wherein said bolt means has a flat head at one end engaging said third face.
Claim 14
Dependent Claim
25 words
A roller cutter assembly according to claim 11, wherein the other end of said bolt means threadedly engages a nut associated with said U-shaped saddle.
Claim 15
Dependent Claim
32 words
A roller cutter assembly according to claim 12, wherein said nut comprises a cylindrical shaft received within a bore in saddle and having a transverse threaded bore threadedly engaging said bolt means.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |