US3711047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill positioning machine
Assignee: BRADLEY PULVERIZER CO
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Filing: 1970-12-14
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Granted: 1973-01-16
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Expires: 1990-12-14
Abstract
Abstract A mount for a standard rock drill and feed unit is pivotally attached to the work end of a boom, which is swingably attached to preferably a rotary mount of unique type for positioning and holding such rock drilling unit at any selected location around a complete drilling circle whose size is determined by the extent of offset of the drill-carrying end of the boom from the axis of rotation of the rotary mount. The means swingably attaching the boom to the rotary mount is unique, in that it functions as a lever, utilizing a link or links and gearing attached to the held end of the boom to automatically advance or retract such boom longitudinally by proper amounts to maintain the drill-carrying end of the boom within a given transverse plane extending at right angles to the axis of rotation of the rotary mount, rather than within what would otherwise be an arcuate path of travel transversely of such axis. The machine also preferably includes a unique hydraulic pantograph arrangement for automatically maintaining the drilling unit mount at a given angle to the work throughout positioning movement of the boom. The special rotary mount utilizes power cylinders of standard leak-free type, together with gearing, to exert positive holding action on the boom at off-vertical positions. The special hydraulic pantograph utilizes slave piston and cylinder units to transmit hydraulic pressures generated by operation of the boom to hydraulic means for rotating the drilling unit mount about its pivot axis at the work end of the boom.
Inventors
- 👤 Leary P O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:55
CPC Classifications
E; E21; E21B; E21B15/00; E21B19/00; E21B19/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
187 words
A machine for positioning and holding a rock drilling unit or other item, comprising a boom or the like having a work end adapted to receive the rock drilling unit or other item and a held end; means for supporting the boom; lever means swingably attaching the held end of the boom to the supporting means, said lever means being adapted to advance or retract the boom longitudinally as it is being swung transversely and comprising link means pivotally secured adjacent one end thereof to the supporting means and pivotally secured adjacent the opposite end thereof to the held end of the boom, and gearing anchored at the pivotal securement of the said one end of the link means as a fulcrum and movably interconnecting said held end of the boom therewith, whereby swinging of the boom will cause the held end of the boom to move in a circular orbit around said axis of pivotal securement of the link means to the supporting means at a predetermined ratio relative to the transverse movement of the boom; and means for swinging the boom transversely of its length.
Claim 2
Dependent Claim
187 words
A machine for positioning and holding a rock drilling unit or other item, comprising a boom or the like having a work end adapted to receive the rock drilling unit or other item and a held end; means for supporting the boom; lever means swingably attaching the held end of the boom to the supporting means, said lever means being adapted to advance or retract the boom longitudinally as it is being swung transversely and comprising link means pivotally secured adjacent one end thereof to the supporting means and pivotally secured adjacent the opposite end thereof to the held end of the boom, and gearing anchored at the pivotal securement of the said one end of the link means as a fulcrum and movably interconnecting said held end of the boom therewith, whereby swinging of the boom will cause the held end of the boom to move in a circular orbit around said axis of pivotal securement of the link means to the supporting means at a predetermined ratio relative to the transverse movement of the boom; and means for swinging the boom transversely of its length.
Claim 3
Dependent Claim
47 words
A machine in accordance with claim 1, wherein the means for supporting the boom is a rotary mount having its axis of rotation extending longitudinally of the boom; and there are included means for rotating said mount transversely through full circles from side-to-side, respectively, of the boom.
Claim 4
Dependent Claim
58 words
A machine in accordance with claim 2, wherein the means for rotating the mount comprise a pair of hydraulic power cylinders; a rotatably mounted crosshead to opposite ends of which the respective power cylinders are connected; a rotary output shaft to which the mount is fixedly secured; and gearing rotatably connecting said crosshead to said rotary output shaft.
Claim 5
Dependent Claim
95 words
A machine in accordance with claim 3, wherein the gearing comprises a bull wheel sector rotatably mounted for rocking movement from side-to-side; a sprocket wheel fixedly secured to the output shaft; a length of roller chain looped about said sprocket wheel and extended over said bull wheel sector with its ends secured at opposite sides thereof; the crosshead being connected to said bull wheel sector for rocking movement therewith; wherein the means for swinging the boom is a hydraulic power cylinder; and wherein there is provided a hydraulic system for operating the hydraulic power cylinders.
Claim 6
Dependent Claim
54 words
A machine in accordance with claim 4, wherein elongate mounting means for the rock drilling unit or other item is pivotally secured to the carrying end of the boom; and means, including hydraulic power cylinders connected into the hydraulic system, are provided for maintaining said mounting means in parallelism as the boom is operated.
Claim 7
Dependent Claim
90 words
A machine in accordance with claim 5, wherein the means for maintaining the mounting means in parallelism comprise a hydraulic power cylinder for moving said mounting means about its pivot axis; a pair of hydraulic power cylinders in the form of piston and cylinder units connected into the hydraulic system in mutual opposition for causing hydraulic fluid to flow to and from the first-named power cylinder; and means for driving said piston and cylinder units in mutual opposition from the pivotal movement of the one end of the link means.
Claim 8
Dependent Claim
102 words
A machine in accordance with claim 6, wherein the rotary mount for the boom comprises a rotary shaft having a bifurcated arm extending transversely of its axis; the one end of the link means is mounted for pivotal movement by being fixedly secured to a shaft journaled in and between the bifurcations of said arm; and the means for driving the piston and cylinder units comprise a sprocket wheel fixedly secured to the last-named shaft, and a length of roller chain looped around said sprocket wheel and having its ends attached to the movable elements of the piston and cylinder units, respectively.
Claim 9
Dependent Claim
74 words
A machine in accordance with claim 6, wherein the hydraulic power cylinder for moving the mounting means for the rock drilling unit or other item has a movable piston with oppositely extending piston rods of the same diameter extending through opposite ends of the cylinder, respectively, so the quantity of hydraulic fluid displaced from one end of the cylinder will equal the quantity of hydraulic fluid introduced into the opposite end of the cylinder.
Claim 10
Dependent Claim
48 words
A machine in accordance with claim 8, wherein pressure relief valves are provided in that portion of the hydraulic system associated with the means for maintaining the mounting means in parallelism, so quantities of hydraulic fluid directed to and from the power cylinders thereof will be balanced automatically.
Claim 11
Dependent Claim
78 words
A machine in accordance with claim 1, wherein the gearing for the lever means comprises a gear wheel fixed to the supporting means and concentric with the axis of the pivotal securement of the link means to said supporting means; a gear wheel fixed to the held end of the boom and concentric with the axis of the pivotal securement of the link means to such held end of the boom; and gear means interconnecting said gear wheels.
Claim 12
Dependent Claim
26 words
A machine in accordance with claim 9, wherein the gear wheels are sprocket wheels and the gear means interconnecting the gear wheels are respective roller chains.
Claim 13
Dependent Claim
177 words
A machine in accordance with claim 1, wherein the held end of the boom is bifurcated; the means for supporting the boom comprises mutually spaced supports encompassed by the bifurcations of said held end of the boom; the lever means includes a shaft extending between and journaled in said supports; the link means comprises a pair of links fixedly secured at one set of corresponding ends thereof to said shaft in mutually spaced relationship; the gearing comprises a pair of sprocket wheels fixedly secured, respectively, to said sUpports concentrically with said shaft, a second pair of sprocket wheels fixedly secured, respectively, to said bifurcations of the boom in alignment with the first pair of sprocket wheels, and a pair of roller chains interconnecting respective sets of corresponding sprocket wheels, said chains being fixedly secured on the respective sprocket wheels of the said first pair; and the said bifurcations of the held end of the boom being journaled, respectively, in the opposite set of corresponding ends of the links concentrically with the said second pair of sprocket wheels.
Claim 14
Dependent Claim
33 words
A machine in accordance with claim 11, wherein the means for swinging the boom transversely of its length is a hydraulic power cylinder interposed between and connected to the boom and the supports.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |