US3782484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool positioning extensible boom
Assignee: Joy Global Industries Ltd
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Filing: 1972-07-18
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Granted: 1974-01-01
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Expires: 1992-07-18
Abstract
Abstract An extensible boom, particularly for mounting on a mobile rock breaking or mining machine, comprises an extensible member mounted for rotation about an axis extending in the direction of its length, a non-rotatable extensible member operative to impart extension to said rotatable member of the boom, means for extending the non-rotatable extensible member of the boom and means on said rotatable member of the boom for mounting a rock breaking or other tool thereon so that said tool operates on an axis which is different to said axis of the rotatable member of the boom and is movable relatively thereto. In one preferred arrangement the tool is supported on a tiltable turntable pivotally mounted on the forward end of the boom.
Inventors
- 👤 D Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:40
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/106; E21C; E21C27/00; E21C27/20; E21C27/28; E21D9/1086
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
109 words
An extensible boom comprising a fixed or stationary outer member, a non-rotatable intermediate extensible member slidably mounted in said outer member, an inner extensible member mounted in said intermediate member for rotation about an axis extending in the direction of its length, means for effecting sliding movement of said intermediate member, inter-engaging means between the intermediate member and the rotatable inner member whereby they are together extended and retracted, and means on said rotatable member of the boom for mounting a tool thereon so that said tool operates on an axis which is different to said axis of the rotatable member of the boom and is movable relative thereto.
Claim 2
Dependent Claim
109 words
An extensible boom comprising a fixed or stationary outer member, a non-rotatable intermediate extensible member slidably mounted in said outer member, an inner extensible member mounted in said intermediate member for rotation about an axis extending in the direction of its length, means for effecting sliding movement of said intermediate member, inter-engaging means between the intermediate member and the rotatable inner member whereby they are together extended and retracted, and means on said rotatable member of the boom for mounting a tool thereon so that said tool operates on an axis which is different to said axis of the rotatable member of the boom and is movable relative thereto.
Claim 3
Dependent Claim
25 words
A boom as claimed in claim 1, wherein the axis of the tool is movable about the axis of the rotatable member of the boom.
Claim 4
Dependent Claim
27 words
A boom as claimed in claim 1, wherein the axis of the tool is tiltable with respect to the axis of the rotatable member of the boom.
Claim 5
Dependent Claim
24 words
An extensible boom as claimed in claim 1, wherein the means for extending the non-rotatable extensible member of the boom is a pressure-fluid ram.
Claim 6
Dependent Claim
30 words
An extensible boom as claimed in claim 1, wherein the rotatable extensible member of the boom is slidable on a splined shaft provided with means whereby it can be rotated.
Claim 7
Dependent Claim
44 words
An extensible boom as claimed in claim 1, wherein rotation of the extensible inner member is effected by a drive shaft rotatably mounted on the stationary outer member and on which drive shaft the inner member is slidable and to which it is keyed.
Claim 8
Dependent Claim
23 words
An extensible boom as claimed in claim 1, wherein rotation of the rotatable extensible member of the boom is effected by a motor.
Claim 9
Dependent Claim
27 words
An extensible boom as claimed in claim 1, wherein rotation of the inner member is effected by a motor mounted on the fixed or stationary outer member.
Claim 10
Dependent Claim
25 words
An extensible boom as claimed in claim 1, wherein rotation of the rotatable extensible member of the boom is effected through worm and worm-wheel gearing.
Claim 11
Dependent Claim
33 words
An extensible boom as claimed in claim 1, wherein a double-acting pressure-fluid ram, for extending the intermediate member of the boom, is connected between said member and the fixed or stationary outer member.
Claim 12
Dependent Claim
48 words
An extensible boom as claimed in claim 1, wherein interengaging abutments are provided between the inner member and intermediate member at the rear ends thereof and between said members at the forward ends thereof whereby extension and retraction of the intermediate member extends and retracts the inner member.
Claim 13
Dependent Claim
21 words
An extensible boom as claimed in claim 1, and having, pivotally mounted on its forward end, support means for a tool.
Claim 14
Dependent Claim
16 words
An extensible boom as claimed in claim 12, wherein said support means includes a tiltable turntable.
Claim 15
Dependent Claim
31 words
A boom as claimed in claim 1, wherein at least one of the extensible members may be held against extension or retraction or the rotatable member may be held against rotation.
Claim 16
Dependent Claim
43 words
A boom as claimed in claim 14, wherein at least one of the extensible members is held against extension or retraction or the rotatable member is held against rotation by making provision for a hydraulic lock in hydraulic operating means for said members.
Claim 17
Dependent Claim
37 words
A boom as claimed in claim 14, wherein a driving motor for the rotatable member is geared to said member by a mechanism which locks said member against rotation except when said driving motor is in operation.
Claim 18
Dependent Claim
18 words
An extensible boom as claimed in claim 1 and having rock breaking equipment mounted on its forward end.
Claim 19
Dependent Claim
21 words
An extensible boom as claimed in claim 17 and having means mounting it on a mobile rock breaking or mining machine.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |