US3666024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drill
Assignee: Individual
•
Filing: 1970-07-29
•
Granted: 1972-05-30
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Expires: 1990-07-29
Abstract
Abstract A rock drill wherein a piston is the only moving hammer part and such piston is movable without independent valve means or the like.
Inventors
- 👤 Richard W Beaumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:04
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/06; E21B6/08; E21B1/00; E21B1/12; E21B1/24; E21B1/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
In a rock drill, the combination comprising: an elongated body member having a chamber extending longitudinally therein; a hammer piston reciprocable within said chamber for percussively actuating a striking bar upon movement of said piston from a first portion of said chamber to a second portion of said chamber; first passageway means in said body member adapted to be connected to a fluid pressure source; second passageway means in said hammer piston in constant open communication with said first passageway means during at least a major portion of the reciprocable travel of said piston; third passageway means in said body member openly communicating between said second passageway means and a piston impact portion of said chamber only when said piston is moving through said first portion of said chamber; and fourth passageway means in said body member openly communicating between said second passageway means and a piston retracting portion of said chamber only when said piston is moving through said second portion of said chamber.
Claim 2
Dependent Claim
165 words
In a rock drill, the combination comprising: an elongated body member having a chamber extending longitudinally therein; a hammer piston reciprocable within said chamber for percussively actuating a striking bar upon movement of said piston from a first portion of said chamber to a second portion of said chamber; first passageway means in said body member adapted to be connected to a fluid pressure source; second passageway means in said hammer piston in constant open communication with said first passageway means during at least a major portion of the reciprocable travel of said piston; third passageway means in said body member openly communicating between said second passageway means and a piston impact portion of said chamber only when said piston is moving through said first portion of said chamber; and fourth passageway means in said body member openly communicating between said second passageway means and a piston retracting portion of said chamber only when said piston is moving through said second portion of said chamber.
Claim 3
Dependent Claim
68 words
A rock drill as specified in claim 1 wherein chamber exhaust means in said body member openly communicate between the exterior of said body member and said piston impact chamber portion at least when said piston is moving through said second portion of said chamber; and when said piston is moving through said first portion of said chamber said last mentioned open communication is discontinued by said piston.
Claim 4
Dependent Claim
68 words
A rock drill as specified in claim 1 wherein chamber exhaust means in said body member openly communicate between the exterior of said body member and said piston retract chamber portion at least when said piston is moving through said first portion of said chamber; and when said piston is moving through said second portion of said chamber said last mentioned open communication is discontinued by said piston.
Claim 5
Dependent Claim
64 words
A rock drill as specified in claim 2 wherein said chamber exhaust means additionally communicate between the exterior of said body member and said piston retract portion at least when said piston is moving through said first portion of said chamber and when said piston is moving through said second portion of said chamber said last mentioned open communication is discontinued by said piston.
Claim 6
Dependent Claim
57 words
A rock drill as specified in claim 1 comprising: rotation means in said body member for rotating said striking bar during said percussive actuation; and thrust bearing means disposed intermediate a stationary portion of said body member and a rotatable portion of said rotation means for the rotatable carrying of said rotatable portion within said body member.
Claim 7
Dependent Claim
30 words
A rock drill as specified in claim 1 wherein said second passageway means is in constant communication with said first passageway means during the entire reciprocable travel of said piston.
Claim 8
Dependent Claim
53 words
A rock drill as specified in claim 1 wherein said hammer piston comprises a head portion and a reduced diameter stem portion; said head portion being of a diameter substantially equal to the diameter of said first and second portion of said chamber; and said second passageway means being in said steM portion.
Claim 9
Dependent Claim
54 words
A rock drill as specified in claim 1 wherein a portion of said hammer piston blocks communication of said piston impact and retracting portions of said chamber with said fluid pressure source when said piston is moving through a central portion of said chamber between said second and said first portions of said chamber.
Claim 10
Dependent Claim
53 words
A rock drill as specified in claim 8 wherein said hammer piston comprises a head portion and a reduced diameter stem portion; said head portion being of a diameter substantially equal to the diameter of said first and second portions of said chamber; and said second passageway means being in said stem portion.
Claim 11
Dependent Claim
102 words
A rock drill as specified in claim 9 wherein chamber exhaust means in said body member openly communicate between the exterior of said body member and said piston impact portion at least when said piston is moving through said second portion of said chamber and openly communicate between the exterior of said body member and said piston retract portion at least when said piston is moving through said first portion of said chamber; and when said piston is moving through said first and second portions of said chamber discontinuing, by said piston, said open communication of said impact and retract portions respectively.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |