US3857516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock-cutting machines
Assignee: Individual
•
Filing: 1972-07-07
•
Granted: 1974-12-31
•
Expires: 1992-07-07
Abstract
Abstract The invention provides a rock cutter which uses high pressure water jets. The jets are emitted from nozzles carried by pressure intensifiers which are mounted on a head that is movable along a frame. The nozzles are movable with the pressure intensifiers and the jets emitted by the nozzles cut slots in the rock face.
Inventors
- 👤 N Taylor
- 👤 C Noren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A cutter comprising means adapted to be fixed at least temporarily in position, a nozzle operatively connected to the fixed means and being movable relative thereto and generator means carried by the fixed means and operatively connected to and movable together with the nozzle and being adapted to supply fluid under pressure to the nozzle to produce a high velocity jet, said generator means comprising an ejector piston and an ejector cylinder discharging through said nozzle; means for actuating said generator means comprising a power piston co-axial with said ejector piston and a power cylinder connectable to a source of pressurized hydraulic fluid; a passage extending through said power piston and said ejector piston for passing pressurized fluid into said ejector cylinder; a tube connectable to a source of low pressure fluid carried by said power piston and projecting from said power cylinder, and detector means for detecting the location of the end of the tube, to control the supply of hydraulic fluid to said power cylinder.
Claim 2
Dependent Claim
167 words
A cutter comprising means adapted to be fixed at least temporarily in position, a nozzle operatively connected to the fixed means and being movable relative thereto and generator means carried by the fixed means and operatively connected to and movable together with the nozzle and being adapted to supply fluid under pressure to the nozzle to produce a high velocity jet, said generator means comprising an ejector piston and an ejector cylinder discharging through said nozzle; means for actuating said generator means comprising a power piston co-axial with said ejector piston and a power cylinder connectable to a source of pressurized hydraulic fluid; a passage extending through said power piston and said ejector piston for passing pressurized fluid into said ejector cylinder; a tube connectable to a source of low pressure fluid carried by said power piston and projecting from said power cylinder, and detector means for detecting the location of the end of the tube, to control the supply of hydraulic fluid to said power cylinder.
Claim 3
Dependent Claim
29 words
A cutting device according to claim 1, wherein said pressure amplifying means consists of a double-acting, differential piston pump, each end of which is connected to a jet nozzle.
Claim 4
Dependent Claim
143 words
A cutter comprising a frame and a head carried by said frame, a pair of nozzles and a pair of generator means, each connected to one of said nozzles, said nozzles and said generator means being carried by said head, said generator means being operatively connected to and movable together therewith relative to said frame and being adapted for supplying fluid under pressure to said nozzles to produce a high velocity jet, said generator means comprising an ejector piston and an ejector cylinder discharging through said nozzles, means for actuating said generator means comprising a power piston and a power cylinder connectable to a source of pressurized hydraulic fluid, the exhaust sides of said power cylinders being interconnected and filled with hydraulic fluid so that as one of the power pistons moves in one direction, the other one moves in the opposite direction.
Claim 5
Dependent Claim
143 words
A cutter comprising a frame and a head carried by said frame, a pair of nozzles and a pair of generator means, each connected to one of said nozzles, said nozzles and said generator means being carried by said head, said generator means being operatively connected to and movable together therewith relative to said frame and being adapted for supplying fluid under pressure to said nozzles to produce a high velocity jet, said generator means comprising an ejector piston and an ejector cylinder discharging through said nozzles, means for actuating said generator means comprising a power piston and a power cylinder connectable to a source of pressurized hydraulic fluid, the exhaust sides of said power cylinders being interconnected and filled with hydraulic fluid so that as one of the power pistons moves in one direction, the other one moves in the opposite direction.
Claim 6
Dependent Claim
102 words
A cutting device for producing eroding high velocity liquid jets for slitting a rock surface, comprising: a stationary main frame; a support head guided relative to said main frame for movement along the rock surface; power means for propelling said support head along said main frame, a cutter unit carried by said support head for directing liquid jets in a direction substantially perpendicular to the direction of movement of said support head; said cutter unit comprising a hydraulically powered pressure amplifying means and two separate jet nozzles; said pressure amplifying means being arranged to alternately feed liquid to said two jet nozzles.
Claim 7
Dependent Claim
102 words
A cutting device for producing eroding high velocity liquid jets for slitting a rock surface, comprising: a stationary main frame; a support head guided relative to said main frame for movement along the rock surface; power means for propelling said support head along said main frame, a cutter unit carried by said support head for directing liquid jets in a direction substantially perpendicular to the direction of movement of said support head; said cutter unit comprising a hydraulically powered pressure amplifying means and two separate jet nozzles; said pressure amplifying means being arranged to alternately feed liquid to said two jet nozzles.
Claim 8
Dependent Claim
35 words
A cutting device according to claim 4, wherein said pressure amplifying means consists of two single-acting, differential piston pumps, each connected to a jet nozzle, said pumps being hydraulically interconnected for performing alternating power strokes.
Claim 9
Dependent Claim
28 words
A cutting device according to claim 5, wherein said pumps are connected to the jet nozzles through pipes which are adjustable to vary the locations of the nozzles.
Claim 10
Dependent Claim
25 words
A cutting device according to claim 5, wherein said pump is adjustably mounted upon the support head for varying the locations of the jet nozzles.
Claim 11
Dependent Claim
49 words
A cutting device according to claim 5, wherein the support head propelling means and said pumps are adapted to each other in such a way that the duration of a single working stroke of said pumps coincides with the full travel of the support head along the main frame.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |