US3765725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock boring machine having driven rotors with swinging hammers
Assignee: Anglo Transvaal Consolidated Investment Co Ltd
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Filing: 1971-07-26
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Granted: 1973-10-16
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Expires: 1991-07-26
Abstract
Abstract A rock boring machine utilizing a cutting head in the form of at least one rotor carrying rock breaking hammers pivotally mounted on the rotor to swing freely between end stops. The rotor is mounted on the end of a forwardly projecting rotatable shaft supported on a rigid frame and the axis of the rotor is inclined to the axis of the shaft at an angle of less than 80*. Independent drives are provided for the rotor and shaft and the cutting head is adapted to bore a hole which will accommodate the whole machine.
Inventors
- 👤 R Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:54
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/106
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A rock boring machine comprising a rigid frame supporting a forwardly projecting rotatable shaft and first means for driving the shaft, said shaft carrying a cutting head having at least one rotor independently rotatable about an axis inclined to the axis of the shaft at an angle of less than 80*, the rotor having second means associated therewith for driving said rotor independently of the shaft about the axis of rotation of said rotor and rock cutting hammers pivotally mounted on said rotor to swing freely between end stops located on the rotor.
Claim 2
Dependent Claim
93 words
A rock boring machine comprising a rigid frame supporting a forwardly projecting rotatable shaft and first means for driving the shaft, said shaft carrying a cutting head having at least one rotor independently rotatable about an axis inclined to the axis of the shaft at an angle of less than 80*, the rotor having second means associated therewith for driving said rotor independently of the shaft about the axis of rotation of said rotor and rock cutting hammers pivotally mounted on said rotor to swing freely between end stops located on the rotor.
Claim 3
Dependent Claim
26 words
A rock boring machine as claimed in claim 1 in which the axis of at least one rotor is off-set from the axis of the shaft.
Claim 4
Dependent Claim
38 words
A rock boring machine as claimed in claim 1 including a shield with an edge of flexible material supported behind the cutting head and of a size to fit closely within a hole made by the cutting head.
Claim 5
Dependent Claim
32 words
A rock boring machine as claimed in claim 1 including a rock extraction mechanism located adjacent the cutting head and a discharge conveyor adapted to receive cut rock from the extraction mechanism.
Claim 6
Dependent Claim
37 words
A rock boring machine as claimed in claim 1 in which the cutting head includes a pair of rotors oppositely disposed around the shaft and with their axes inclined and off-set from the axis of the shaft.
Claim 7
Dependent Claim
28 words
A rock boring machine as claimed in claim 5 including further rotors arranged about the shaft and located radially outwardly of and rearwardly of the pair of rotors.
Claim 8
Dependent Claim
34 words
A rock boring machine as claimed in claim 6 in which the further rotors are symmetrically arranged about the shaft and adapted to operate to give an equal rock breaking load to each rotor.
Claim 9
Dependent Claim
20 words
A rock boring machine as claimed in claim 6 in which the rotors have different numbers of hammers mounted thereon.
Claim 10
Dependent Claim
29 words
A rock boring machine as claimed in claim 1 in which the rotor is driven through a hydraulic motor and the shaft through a separate motor and drive assembly.
Claim 11
Dependent Claim
23 words
A rock boring machine as claimed in claim 9 in which the power supply to the rotor motor is passed through the shaft.
Claim 12
Dependent Claim
17 words
A rock boring machine as claimed in claim 1 in which the frame is a mobile chassis.
Claim 13
Dependent Claim
39 words
A rock boring machine as claimed in claim 11 in which the chassis has an upwardly projecting pivotally mounted and resiliently supported stabilizing boom adapted to contact the wall of a hole cut by the machine above the chassis.
Claim 14
Dependent Claim
33 words
A rock boring machine as claimed in claim 12 in which the chassis is mounted on wheels driven by hydraulic motors and the boom carries a free running wheel at its upper end.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |