US3617093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine drum cutter extension means
Assignee: Joy Manufacturing Co
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Filing: 1970-09-14
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Granted: 1971-11-02
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Expires: 1990-09-14
Abstract
Abstract A mining and loading apparatus and more particularly a continuous-mining apparatus having improved drum cutter extension means for dislodging mineral from a solid mine vein. This drum cutter incorporates a double passageway head shaft for activating hydraulic cylinders to extend and retract extensible drum portions of the drum cutter.
Inventors
- 👤 Glenn A Daily
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:59
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/32; E21C27/38
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
194 words
A mining machine cutting structure comprising: a support member; an elongated mining head member mounted at the forward end of said support member for powered rotation about a longitudinal axis of said head member and having axially extensible and retractable end portion; said mining head member including a longitudinally extending tubular head shaft transmitting power for said powered rotation, said support member having extension portions for supporting said head shaft at axially spaced portions thereof; and elongated member coaxially received within said head shaft and inwardly spaced from at least a portion of the inner surface thereof to form an elongated chamber in conjunction therewith, said elongated member having an axial bore extending therein; each of said extension portions having a passageway therein, said passageways communicating at one end thereof with said axial bore and said chamber, respectively, and said passageways, at the other ends thereof, adapted to be selectively connected to individual ones of a pressure fluid source and a fluid reservoir; and fluid operable extensible means connected to said reciprocable end portions and operatively connected to said chamber and said bore for the selective extension and retraction of said reciprocable end portions.
Claim 2
Dependent Claim
194 words
A mining machine cutting structure comprising: a support member; an elongated mining head member mounted at the forward end of said support member for powered rotation about a longitudinal axis of said head member and having axially extensible and retractable end portion; said mining head member including a longitudinally extending tubular head shaft transmitting power for said powered rotation, said support member having extension portions for supporting said head shaft at axially spaced portions thereof; and elongated member coaxially received within said head shaft and inwardly spaced from at least a portion of the inner surface thereof to form an elongated chamber in conjunction therewith, said elongated member having an axial bore extending therein; each of said extension portions having a passageway therein, said passageways communicating at one end thereof with said axial bore and said chamber, respectively, and said passageways, at the other ends thereof, adapted to be selectively connected to individual ones of a pressure fluid source and a fluid reservoir; and fluid operable extensible means connected to said reciprocable end portions and operatively connected to said chamber and said bore for the selective extension and retraction of said reciprocable end portions.
Claim 3
Dependent Claim
48 words
A mining machine cutting structure as specified in claim 1 wherein said fluid operably extensible means comprise a pair of axially spaced extensible hydraulic cylinder assemblies secured within each end of said head shaft, each of said cylinder assemblies having respective pistons, rods, rod ends and head ends.
Claim 4
Dependent Claim
66 words
A mining machine cutting structure as specified in claim 2 wherein each of said head ends have a pilot-operated check valve mounted thereon communicating through said check valve with said axial bore, each of said rod ends communicating with said chamber, and control portal means communicating between said check valve and said chamber for the receiving a flow of unlocking pressure fluid into said check valve.
Claim 5
Dependent Claim
30 words
A mining machine cutting structure as specified in claim 1 additionally including bearing means disposed intermediate said support member extension portions and said head shaft at said axially spaced portions.
Claim 6
Dependent Claim
45 words
A mining machine cutting structure as specified in claim 4 including sealing means disposed intermediate said support member extension portions and said head shaft axially outwardly of each of said bearing means and each of said passageways extending through respective ones of said sealing means.
Claim 7
Dependent Claim
36 words
A mining machine cutting structure as specified in claim 1 wherein said bore supplies pressure fluid for the extension of said end portions and said chamber provides pressure fluid for the retraction of said end portions.
Claim 8
Dependent Claim
170 words
In a mining machine of the type having a forwardly extending support member with an elongated mining head member transversely mounted at the forward end of said support member for powered rotation about the central longitudinal axis of said head member and in which said support member includes a casing rotatably supporting an elongated hEad shaft transmitting power for said powered rotation mounted within outwardly extending casing extension portions encompassing axially spaced portions of said head shaft, the improvement wherein; said head shaft has an axial through bore; an elongated member within said shaft inwardly spaced from at least a portion of the inner surface of said bore forming a pair of axial passageways within said bore, each of said casing extension portions has a passageway therein communicating selectively at one end with an external source of pressure fluid and a fluid-receiving tank alternatively, and the other ends of said casing passageways communicating with fluid tight means in turn communicating with individual ones of said pair of axial passageways respectively.
Claim 9
Dependent Claim
170 words
In a mining machine of the type having a forwardly extending support member with an elongated mining head member transversely mounted at the forward end of said support member for powered rotation about the central longitudinal axis of said head member and in which said support member includes a casing rotatably supporting an elongated hEad shaft transmitting power for said powered rotation mounted within outwardly extending casing extension portions encompassing axially spaced portions of said head shaft, the improvement wherein; said head shaft has an axial through bore; an elongated member within said shaft inwardly spaced from at least a portion of the inner surface of said bore forming a pair of axial passageways within said bore, each of said casing extension portions has a passageway therein communicating selectively at one end with an external source of pressure fluid and a fluid-receiving tank alternatively, and the other ends of said casing passageways communicating with fluid tight means in turn communicating with individual ones of said pair of axial passageways respectively.
Claim 10
Dependent Claim
79 words
In a mining machine as specified in claim 7 the further improvement wherein; bearing means are mounted within said casing extension portions inwardly adjacent the outer ends of said casing portions to support said shaft and wherein said fluidtight means comprises sealing means encompassing said shaft located axially outwardly of each of said bearing means and mounted at least partially within the outer ends of said casing portions to provide liquid-tight relationship between said shaft and said casing portions.
Claim 11
Dependent Claim
69 words
In a mining machine as specified in claim 8 the further improvement wherein each of said sealing means is interposed between a spacer sleeve secured in fluidtight relationship on the outer surface of said head shaft and an annular keeper member secured within the outer end of each of said casing extension portions in fluidtight relationship therewith and said keeper member and said sleeve had intercommunicating passageway means therein.
Claim 12
Dependent Claim
83 words
In a mining machine as specified in claim 9 the further improvement wherein said passageway means in said keeper member comprises an external peripheral groove and an internal peripheral groove in said keeper member communicating with each other through at least one radial opening open ended in both grooves and said passageway means in said spacer sleeve comprise a groove in the internal peripheral surface thereof communicating with the external surface of said sleeve through at leas one radial opening in said sleeve.
Claim 13
Dependent Claim
30 words
In a mining machine as specified in claim 9 the further improvement wherein said spacer sleeves rotate with said shaft and said keepers are held stationary by said casing extension.
Claim 14
Dependent Claim
93 words
In a mining machine as specified in claim 7 the further improvement wherein said bore has an extensible hydraulic cylinder assembly secured withing each end thereof, said cylinder assemblies having respective pistons, rods, rod ends and head ends, each head end having a pilot operated check valve mounted thereon and communicating through said valve with one of said axial passageways, each said rod end communicating with the other of said axial passageways, and each said pilot operated check valve communicating with said other passageway through a control portal for receiving unlocking pressure fluid.
Claim 15
Dependent Claim
84 words
In a mining machine as specified in claim 12 the further improvement wherein a pair of cutter-carrying drums is mounted on axially spaced portions of said head shaft and said drums have axially slidable drum extension portions mounted therein, each said drum extension portion being secured to a respective one of said rod ends to be selectively moved axially thereby, said axial movement being effected by said selective connecting of said casing extension passageways with said source of fluid pressure and said tank, respectively.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |