US3744575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill feed bar
Assignee: Atlas Copco AB
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Filing: 1971-09-01
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Granted: 1973-07-10
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Expires: 1991-09-01
Abstract
Abstract A rock drill feed bar supported by a drill boom is longitudinally displacable as well as extendable. For that reason it comprises a first, a second and a third bar member which are slidably attached to each other. The first bar member is boxshaped and undisplacably connected to the drill boom and lodges a hydraulic piston-cylinder actuating device which is arranged to move the bar members relative to each other for accomplishing extension and longitudinal displacement of the feed bar. A rock drill carrying slide and a hose reel are guided upon the third bar member and are arranged to be fed along this bar member by means of a feeding device.
Inventors
- 👤 A Strommes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:31
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/086
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A feed bar for a rock drill rod comprising: a first bar member ridgidly connected to a drill boom for directing the rock drill towards a work surface; a second bar member slidably engaging said first bar member and a third bar member slidably engaging said second bar member; said third bar member slidably supporting the rock drill; said second bar member having a work surface engaging member; actuating means effective to move said second bar member together with said third bar member relative to said first bar member in a direction toward the work surface until said surface engaging member abuts against the work surface and thereby establishes the longitudinal displacement of the feed bar relative to the work surface.
Claim 2
Dependent Claim
121 words
A feed bar for a rock drill rod comprising: a first bar member ridgidly connected to a drill boom for directing the rock drill towards a work surface; a second bar member slidably engaging said first bar member and a third bar member slidably engaging said second bar member; said third bar member slidably supporting the rock drill; said second bar member having a work surface engaging member; actuating means effective to move said second bar member together with said third bar member relative to said first bar member in a direction toward the work surface until said surface engaging member abuts against the work surface and thereby establishes the longitudinal displacement of the feed bar relative to the work surface.
Claim 3
Dependent Claim
83 words
A feed bar according to claim 1 in which said actuating means are further effective to move said third bar member relative to said second bar member in a direction away from the work surface upon engagement of the second bar member with the work surface and means being provided for arresting the movement of said third bar member upon having moved a predetermined distance corresponding to the length of the drill rod to be used and thereby define the drill feed range.
Claim 4
Dependent Claim
23 words
A rock drill feed bar according to claim 1, characterized in that the first bar member is box-shaped and encloses the actuating means.
Claim 5
Dependent Claim
94 words
A rock drill feed bar according to claim 1, characterized in that the actuating means is constituted by a piston-cylinder device which comprises a main cylinder which is rigidly attached to said first bar member, a first piston which is annular and slidably guided in said main cylinder, a first piston rod connecting said first piston and said second bar member, said first piston rod being tubular constituting a second cylinder, a second piston slidably guided in said second cylinder, and a second piston rod connecting said second piston and said third bar member.
Claim 6
Dependent Claim
26 words
A rock drill feed bar according to claim 4, characterized in that said first and second piston rods extend in opposite directions from the main cylinder.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |