US3835944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting unit for use on rock boring machines
Assignee: Hard Metals Ltd
•
Filing: 1973-06-12
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Granted: 1974-09-17
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Expires: 1993-06-12
Abstract
Abstract A rock-boring machine of the type comprising rotatable headplate having a plurality of cutting units mounted on the front face of the headplate. Each cutting unit includes a cutter journalled for rotation on a shaft. The ends of the shaft are hexagonal in cross-section and are supported in complementally-slotted saddles to prevent rotation of the shaft in the saddles. The shaft is locked in the saddles by means of a single locking member at each end of the shaft. Each locking member is secured to a saddle and is adapted to bear against one of the surfaces of the hexagonal ends of the shaft.
Inventors
- 👤 H Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:45
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/10; E21B10/26; E21B10/28; E21B10/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A rock-boring machine of the type comprising a rotatable headplate, a plurality of cutting units mounted on the front face of the headplate, each cutting unit comprising a base, a bearing shaft supported in suitable saddle structures mounted on the base, and a cutter mounted for rotation on the bearing shaft characterized in that each end of each bearing shaft is provided with at least first and second diametrically opposed and parallel flats and a third flat adjacent the first flat and subtending therewith an obtuse angle, each saddle has a complemental crosssectional shape for receiving an end of a bearing shaft, and in that each end of each bearing shaft is secured in its respect saddle by a single clamping block bearing against the third flat of that shaft end.
Claim 2
Dependent Claim
131 words
A rock-boring machine of the type comprising a rotatable headplate, a plurality of cutting units mounted on the front face of the headplate, each cutting unit comprising a base, a bearing shaft supported in suitable saddle structures mounted on the base, and a cutter mounted for rotation on the bearing shaft characterized in that each end of each bearing shaft is provided with at least first and second diametrically opposed and parallel flats and a third flat adjacent the first flat and subtending therewith an obtuse angle, each saddle has a complemental crosssectional shape for receiving an end of a bearing shaft, and in that each end of each bearing shaft is secured in its respect saddle by a single clamping block bearing against the third flat of that shaft end.
Claim 3
Dependent Claim
23 words
A rock-boring machine as claimed in claim 1 characterised in that each clamping block is adapted to be secured to its respective saddle.
Claim 4
Dependent Claim
29 words
A rock-boring machine as claimed in claim 1 characterised in that the ends of the bearing shafts are hexagonal in cross-section to provide the first, second and third flats.
References Cited (Backward Citations)
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Cited
US3203492A
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US3627068A
Cited
US3612196A
Cited
US3705750A
Cited
US3705635A
Cited
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Cited
US3749188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |