US3822752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill
Assignee: Individual
•
Filing: 1972-02-25
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Granted: 1974-07-09
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Expires: 1992-02-25
Abstract
Abstract A rock drill actuated solely by a liquid medium under pressure comprises a hydraulic motor for rotating the drill steel and another hydraulic motor for applying axial blows to drill; said motors are hydraulically connected in series, with a valve regulator inserted in the supply circuit upstream of the rotational motor. The striker motor is supplied with liquid both from the outlet of the rotational motor and from an additional source of fluid under a pressure equal to the outlet pressure of said rotational motor, a pressure-adding valve being mounted as a buffer valve between the liquid inlets of the two motors.
Inventors
- 👤 R Montabert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:25
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B6/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first hydraulic motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motors only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motors, said conduits passing liquid through said motors in series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; and a pressure regulator valve connected between said first conduit and a reservoir to maintain substantially constant the liquid pressure applied to at least part of said driver system; and, said pressure regulator valve draining one of said conduits directly to said reservoir upon the development of excess pressure in said first conduit.
Claim 2
Dependent Claim
205 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first hydraulic motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motors only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motors, said conduits passing liquid through said motors in series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; and a pressure regulator valve connected between said first conduit and a reservoir to maintain substantially constant the liquid pressure applied to at least part of said driver system; and, said pressure regulator valve draining one of said conduits directly to said reservoir upon the development of excess pressure in said first conduit.
Claim 3
Dependent Claim
191 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first hydraulic motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motor only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motor, said conduits passing liquid through said motor in a series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; and a pressure regulator connected to said first conduit to maintain substantially constant the liquid pressure applied to at least part of said driver system; said pressure regulator being a pressure relief valve connected to said first conduit.
Claim 4
Dependent Claim
191 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first hydraulic motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motor only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motor, said conduits passing liquid through said motor in a series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; and a pressure regulator connected to said first conduit to maintain substantially constant the liquid pressure applied to at least part of said driver system; said pressure regulator being a pressure relief valve connected to said first conduit.
Claim 5
Dependent Claim
210 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motor only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motor, said conduits passing liquid through said motors in a series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; a pressure regulator connected to said first conduit to maintain substantially constant the liquid pressure applied to at least part of said driver system; and a fourth conduit connecting another source of liquid under pressure to the inlet of said second hydraulic motor, said pressure regulator comprising a pressure-adding buffer valve connected across said first and fourth conduits.
Claim 6
Dependent Claim
210 words
A rock drill comprising: a tool holder; a first hydraulic motor operatively connected to said tool holder for rotating same; a second hydraulic motor operatively connected to said tool holder for imparting axial impacts thereto, said motors together forming a driver system for said tool holder, each of said hydraulic motors having an inlet and an outlet for hydraulic fluid traversing same; a first conduit connecting the inlet of said first motor to a source of liquid under pressure; a second conduit connecting the outlet of said first hydraulic motor only to the intake of the second hydraulic motor; a third conduit leading liquid from the outlet of said second hydraulic motor, said conduits passing liquid through said motors in a series circuit whereby an increasing resistance to rotation of said tool holder by said first motor is reflected in a decreased impact force of said second motor upon said tool holder; a pressure regulator connected to said first conduit to maintain substantially constant the liquid pressure applied to at least part of said driver system; and a fourth conduit connecting another source of liquid under pressure to the inlet of said second hydraulic motor, said pressure regulator comprising a pressure-adding buffer valve connected across said first and fourth conduits.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |