US3858666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous rotation rock drill
Assignee: Cannon Industries Inc
•
Filing: 1972-09-28
•
Granted: 1975-01-07
•
Expires: 1992-09-28
Abstract
Abstract A rock drill having a drill rotation motor coaxial with the percussion motor hammer piston and surrounding the striking bar of the drill.
Inventors
- 👤 Edward A Bailey
- 👤 Walter D Fish
- 👤 Rene Pertusio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:20
CPC Classifications
E; E21; E21B; E21B6/00; Y; Y10; Y10S; Y10S173/00; Y10S173/01; Y10S173/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A pressure fluid actuated rock drill comprising: an elongated cylinder body; a piston member reciprocable in said cylinder body along the central longitudinal axis of said body; passageway means adapted to be connected to a fluid pressure source to supply fluid under pressure to reciprocate said piston member in said body; an elongated striking bar slidably rotatably mounted in said body and coaxial therewith to receive blows from said piston; a fluid operated reversible drill rotation motor symmetrical about said axis and in driving communication with a striking bar chuck driver for the selective rotation of said striking bar in opposite directions about the longitudinal axis thereof; and speed reduction gear means including a set of planetary gears coaxial with said rotation motor and in driving engagement between said rotation motor and said chuck driver.
Claim 2
Dependent Claim
135 words
A pressure fluid actuated rock drill comprising: an elongated cylinder body; a piston member reciprocable in said cylinder body along the central longitudinal axis of said body; passageway means adapted to be connected to a fluid pressure source to supply fluid under pressure to reciprocate said piston member in said body; an elongated striking bar slidably rotatably mounted in said body and coaxial therewith to receive blows from said piston; a fluid operated reversible drill rotation motor symmetrical about said axis and in driving communication with a striking bar chuck driver for the selective rotation of said striking bar in opposite directions about the longitudinal axis thereof; and speed reduction gear means including a set of planetary gears coaxial with said rotation motor and in driving engagement between said rotation motor and said chuck driver.
Claim 3
Dependent Claim
24 words
A rock drill as specified in claim 1 wherein said passageway means include cooperable passageways in said hammer piston and in said cylinder body.
Claim 4
Dependent Claim
33 words
The rock drill as specified in claim 2 wherein said piston member comprises a head portion and an elongated stem portion and said passageways in said piston member are in said stem portion.
Claim 5
Dependent Claim
52 words
The rock drill as specified in claim 1 wherein said rotation motor comprises; a double pitch driving gear coaxial with said body, a plurality of double pitch driving pinions equidistant from said axis, and fluid conducting passageway means for rotation of said striking bar in either a forward or a reverse direction.
Claim 6
Dependent Claim
39 words
The rock drill as specified in claim 4 wherein said speed reduction gear means is supported on antifriction bearing means at each end of said motor and said driving gear is supported independently of said speed reduction gear means.
Claim 7
Dependent Claim
19 words
The rock drill as specified in claim 5 wherein said support of said driving gear includes antifriction bearing means.
Claim 8
Dependent Claim
28 words
The rock drill as specified in claim 1 additionally comprising a muffler and said rotation motor has primary exhaust connections permanently connected to the interior of said muffler.
Claim 9
Dependent Claim
35 words
The rock drill as specified in claim 7 wherein said rotation motor has anti-friction bearings at both axial ends thereof with secondary exhaust passageway means conducting exhaust fluid from said rotation motor to said bearings.
Claim 10
Dependent Claim
23 words
The rock drill as specified in claim 8 wherein said secondary exhaust passageway means also communicate with the exterior of said striking bar.
References Cited (Backward Citations)
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |