US3570608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer mechanism for percussion tools
Assignee: Atlas Copco AB
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Filing: 1969-04-30
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Granted: 1971-03-16
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Expires: 1989-04-30
Abstract
Abstract This invention relates to a hammer mechanism for percussion tools provided with a hammer piston for delivering blows to a percussion implement, and further provided with a hammer element arranged movable relatively to said hammer piston, said hammer piston being stopped during the upward movement thereof by said hammer element for delivering the kinetic energy of said hammer piston to said hammer element.
Inventors
- 👤 Eero Antero Erma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/10; B25D11/00; B25D11/06; B25D11/12; B25D11/125; B25D9/08; E; E21; E21B; E21B1/00; E21B1/12; E21B1/24; E21B1/30; E21B1/32; E21B1/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
274 words
A hammer mechanism for a percussion tool, particularly for a portable rock drill of the type having a working piston which by means of a pressure medium in a working chamber for said piston drives a hammer piston which transmits its kinetic energy to a percussion implement, said hammer mechanism having a hammer member arranged movably relatively to said hammer piston in the direction of motion thereof, a first abutment in the hammer mechanism which limits the movement of the hammer member in a first direction, a return motion chamber for the hammer piston in which a pressure medium acts on the hammer piston in a second opposite direction, means for biasing said hammer member towards a resting position on said first abutment when the hammer piston delivers a blow to said percussion implement, a second abutment on the hammer member and a third abutment on the hammer piston arranged to cooperate with said second abutment so that when the hammer piston has delivered a blow the hammer piston is moved in said second direction by the pressure medium in said return chamber until said third abutment engages the second abutment, the mass of the hammer member being so dimensioned relatively to the mass of the hammer piston as to cause the hammer piston motion in the second direction to stop when the third abutment engages the second abutment and the kinetic energy of the hammer piston is delivered to the hammer member, so that the hammer piston always attains well-defined end positions in the hammer mechanism irrespective of the magnitude of the recoil from the percussion implement and the material to be treated.
Claim 2
Dependent Claim
274 words
A hammer mechanism for a percussion tool, particularly for a portable rock drill of the type having a working piston which by means of a pressure medium in a working chamber for said piston drives a hammer piston which transmits its kinetic energy to a percussion implement, said hammer mechanism having a hammer member arranged movably relatively to said hammer piston in the direction of motion thereof, a first abutment in the hammer mechanism which limits the movement of the hammer member in a first direction, a return motion chamber for the hammer piston in which a pressure medium acts on the hammer piston in a second opposite direction, means for biasing said hammer member towards a resting position on said first abutment when the hammer piston delivers a blow to said percussion implement, a second abutment on the hammer member and a third abutment on the hammer piston arranged to cooperate with said second abutment so that when the hammer piston has delivered a blow the hammer piston is moved in said second direction by the pressure medium in said return chamber until said third abutment engages the second abutment, the mass of the hammer member being so dimensioned relatively to the mass of the hammer piston as to cause the hammer piston motion in the second direction to stop when the third abutment engages the second abutment and the kinetic energy of the hammer piston is delivered to the hammer member, so that the hammer piston always attains well-defined end positions in the hammer mechanism irrespective of the magnitude of the recoil from the percussion implement and the material to be treated.
Claim 3
Dependent Claim
51 words
A hammer mechanism according to claim 1, in which the hammer member is a hammer ring which concentrically encloses and slidably cooperates with the hammer piston and together with the hammer piston defines the return chamber, the pressure medium in said return chamber forming the means for biasing the hammer member.
Claim 4
Dependent Claim
57 words
A hammer mechanism according to claim 1, in which the hammer mechanism has a casing in which an annular seat is provided for said hammer ring, said seat forming the first abutment, an internal annular flange on the hammer Ring forming the second abutment, and an external annular flange on the hammer piston forming the third abutment.
Claim 5
Dependent Claim
45 words
A hammer mechanism as defined in claim 1, in which the working piston constitutes a compressor piston driven by a crank shaft having an internal combustion engine piston journaled thereon, the compressor piston and the engine piston being journaled on opposite cranks of said crankshaft.
Claim 6
Dependent Claim
46 words
A hammer mechanism as defined in claim 1, in which the distance between the hammer piston and the working piston in their uppermost positions is chosen so as to optimize the blow energy per time unit at a predetermined number of blows of the hammer mechanism.
Claim 7
Dependent Claim
152 words
A hammer mechanism for a percussion tool and particularly for a portable rock drill of the type having a working piston which by means of a pressure medium in a working chamber for said piston drives a hammer piston which transmits its kinetic energy to a percussion implement, the hammer piston having a hammer ring arranged concentrically around it and acting as an auxiliary piston for the hammer piston, a casing in which the hammer ring is fitted, said casing having a seat forming a first abutment for the hammer ring, the hammer ring having an annular flange forming a second abutment, said second abutment cooperating with a third abutment formed by an annular flange provided on the hammer piston, the flange on the hammer ring being engaged by the third abutment during the upward movement of the hammer piston and the first abutment limiting the downward movement of the hammer ring.
Claim 8
Dependent Claim
152 words
A hammer mechanism for a percussion tool and particularly for a portable rock drill of the type having a working piston which by means of a pressure medium in a working chamber for said piston drives a hammer piston which transmits its kinetic energy to a percussion implement, the hammer piston having a hammer ring arranged concentrically around it and acting as an auxiliary piston for the hammer piston, a casing in which the hammer ring is fitted, said casing having a seat forming a first abutment for the hammer ring, the hammer ring having an annular flange forming a second abutment, said second abutment cooperating with a third abutment formed by an annular flange provided on the hammer piston, the flange on the hammer ring being engaged by the third abutment during the upward movement of the hammer piston and the first abutment limiting the downward movement of the hammer ring.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |