US3751114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter bit and block
Assignee: ILLINOIS WATER TREATMENT COMPANY A DE CORP
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Filing: 1971-09-22
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Granted: 1973-08-07
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Expires: 1991-09-22
Abstract
Abstract An improved cutter bit and block for a mining or excavating machine of the type wherein bits are circumferentially spaced around a rotary cutting head or mounted on a cutting chain, characterized in that each bit has a cylindrical shank which can rotate within a cooperating bore in a bit block secured to the cutting head or chain. The cutting tool carried on the bit has a cutting edge behind the axis of the shank in the direction of movement of the cutting head or chain such that, as the angle of attack of the cutting device is changed, the bit will rotate to cause the cutting tool to cut on its forward edge at all times, eliminating wear on the sides of the bit and the production of dust within a coal mine or other similar environment.
Inventors
- 👤 C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:35
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/183; E21C35/1831; E21C35/1837; E21C35/19; E21C35/193; E21C35/1933
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A machine for cutting material in the ground comprising a rotary member adapted to be positioned adjacent the material to be cut, a plurality of cutter bit assemblies mounted in spaced apart relationship on the periphery of said rotary member, each of said cutter bit assemblies including a bit block secured to said rotary member, a generally cylindrical bore in said bit block, a cutter bit having a cylindrical shank portion fitted into the bore in said bit block and rotatable therein, and a cutting tip carried on said cutter bit and having a forward cutting edge offset with respect to the axis of said cylindrical shank portion, the arrangement being such that as said head rotates and said cutting edge engages material to be mined, the cutter bit and the tip carried thereby can rotate about the axis of said shank portion to a position where the cutting edge is behind the axis of the shank portion in the direction of movement of the cutter bit toward the material.
Claim 2
Dependent Claim
170 words
A machine for cutting material in the ground comprising a rotary member adapted to be positioned adjacent the material to be cut, a plurality of cutter bit assemblies mounted in spaced apart relationship on the periphery of said rotary member, each of said cutter bit assemblies including a bit block secured to said rotary member, a generally cylindrical bore in said bit block, a cutter bit having a cylindrical shank portion fitted into the bore in said bit block and rotatable therein, and a cutting tip carried on said cutter bit and having a forward cutting edge offset with respect to the axis of said cylindrical shank portion, the arrangement being such that as said head rotates and said cutting edge engages material to be mined, the cutter bit and the tip carried thereby can rotate about the axis of said shank portion to a position where the cutting edge is behind the axis of the shank portion in the direction of movement of the cutter bit toward the material.
Claim 3
Dependent Claim
30 words
A machine according to claim 1 in which the axis of said shank portion is substantially normal to the axis of movement of said cutter bit assembly toward said material.
Claim 4
Dependent Claim
60 words
A machine according to claim 1 wherein said shank portion is provided with an annular groove which receives the radial inner end of a fastening bolt extending through the wall of said bit block for holding the cutter bit within the bore in said bit block while permitting rotation of the cutter bit within the bore in said bit block.
Claim 5
Dependent Claim
16 words
A machine according to claim 1 wherein said cutting tip is removable from said cutter bit.
Claim 6
Dependent Claim
57 words
A machine according to claim 4 wherein said cutter bit is provided with a slot therein and a receptacle for said cutting tip, the slot intersecting said receptacle, and bolts means for forcing the portions of said cutter bit on opposite sides of said slot into engagement with the cutting tip to hold it in the receptacle.
Claim 7
Dependent Claim
17 words
A machine according to claim 5 wherein said cutting tip has a forward essentially straight-line cutting edge.
Claim 8
Dependent Claim
30 words
A machine according to claim 6 in which the axis of said shank portion is substantially normal to the axis of movement of said cutter bit assembly toward said material.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |