US3847439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary coal cutters with water jet orifices
Assignee: Fletcher Sutcliffe Wild Ltd
•
Filing: 1972-12-11
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Granted: 1974-11-12
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Expires: 1992-12-11
Abstract
Abstract A rotary coal cutter of the type having a drum mounting a ring cutting implement and a helical cutting implement or a helical guide for coal, wherein channels lead from the interior of the drum through the ring cutting implement to orifices from which water can be fitted to reduce dust.
Inventors
- 👤 T Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:03
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/22; E21C35/23
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A rotary coal cutter comprising a drum, a cutting implement mounted on the drum and having a peripheral face adapted for mounting picks in a circle about the drum axis, and a helical guide wall for cut coal mounted co-axially on the drum adjacent the cutting implement, wherein the improvement comprises the cutting implement defining orifices and passages leading from an interior part of the drum to the orifices and wherein the cutting implement includes a plurality of brackets spaced around the drum and serving to mount the implement on the drum, each bracket defining at least one of said passages leading to a corresponding orifice in the bracket.
Claim 2
Dependent Claim
109 words
A rotary coal cutter comprising a drum, a cutting implement mounted on the drum and having a peripheral face adapted for mounting picks in a circle about the drum axis, and a helical guide wall for cut coal mounted co-axially on the drum adjacent the cutting implement, wherein the improvement comprises the cutting implement defining orifices and passages leading from an interior part of the drum to the orifices and wherein the cutting implement includes a plurality of brackets spaced around the drum and serving to mount the implement on the drum, each bracket defining at least one of said passages leading to a corresponding orifice in the bracket.
Claim 3
Dependent Claim
52 words
A rotary coal cutter according to claim 1, wherein the peripheral outer face of the bracket defines an orifice and at least one other orifice is defined by one of the faces extending between the inner and outer peripheries of the cutting implement the bracket defining passages leading to all the orificies.
Claim 4
Dependent Claim
35 words
A rotary coal cutter according to claim 2, wherein each bracket defines a main passage leading from the interior of the drum and defines branch passages leading from the main passage to the respective orificies.
Claim 5
Dependent Claim
33 words
A rotary coal cutter according to claim 1, wherein the cutting implement includes a plurality of segments mounted alternately with the brackets about the drum axis, the segments being adapted for mounting picks.
References Cited (Backward Citations)
US3085795A
Cited
GB1042019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |