US3924691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engine driven hammer machines
Assignee: Atlas Copco AB
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Filing: 1973-06-08
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Granted: 1975-12-09
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Expires: 1993-06-08
Abstract
Abstract A combustion engine driven hammer machine is disclosed, which incorporates a clutch unit which automatically disengages the drill-rotation when the throttle is moved to a certain part of its adjustment range.
Inventors
- 👤 Kurt Osten Brannstrom
- 👤 Levi Johannes Karlfors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:19
CPC Classifications
E; E21; E21B; E21B6/00; E21B1/00; E21B1/12; E21B1/24; E21B1/30; E21B1/32; E21B1/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A device relating to combustion engine driven hammer machines and comprising a machine housing, a crankshaft which is arranged in the machine housing and connected to a compressor piston and driven by a combustion engine, a throttle controlling said engine, a device comprising a servomotor, which is controlled in dependence on the position of the throttle, for transferring rotation from the crankshaft to a drill-sleeve for rotating a tool which is inserted into the drill-sleeve, and a clutch unit which is actuated by the servomotor for engagement or disengagement of the rotation.
Claim 2
Independent Claim
92 words
A device relating to combustion engine driven hammer machines and comprising a machine housing, a crankshaft which is arranged in the machine housing and connected to a compressor piston and driven by a combustion engine, a throttle controlling said engine, a device comprising a servomotor, which is controlled in dependence on the position of the throttle, for transferring rotation from the crankshaft to a drill-sleeve for rotating a tool which is inserted into the drill-sleeve, and a clutch unit which is actuated by the servomotor for engagement or disengagement of the rotation.
Claim 3
Dependent Claim
66 words
A device according to claim 1, in which a conduit is arranged for transferring a fluid-pressure, created by the compressor piston, to the servomotor for engaging the rotation, and connected to a valve, which is actuated by the throttle and connects the conduit to a low pressure when the throttle is moved to a certain part of its adjustment range, through which the rotation is disengaged.
Claim 4
Dependent Claim
62 words
A device according to claim 2, in which the servomotor comprises an actuator which is fluidtightly connected to a diaphragm, which is fluidtightly connected to the machine housing in order to form a chamber together therewith, to which the fluid-pressure, created by the compressor piston, is conducted for displacing the actuator against the action of a spring for engagement of the rotation.
Claim 5
Dependent Claim
91 words
A device according to claim 1, in which the clutch unit comprises a driving part provided with a number of recesses each accommodating a roller, one or more radially acting spring means for pressing the rollers against a cam on a driven part which is made as one coupling part of the clutch unit, the other coupling part of which is coaxial with and essentially surrounded by the driven part and axially displaceably arranged partly in relation to this and partly on an outgoing axle for moment-transferring cooperation with the latter.
Claim 6
Dependent Claim
96 words
A device according to claim 1, in which a function selector comprising an essentially cylindrical part, which is guided in the machine housing and provided with, an eccentric first terminal for actuating a spring-loaded dog for barring the drillsleeve against rotation when the function selector is in a certain adjustment position, and a second-terminal which is made as a slide-valve for blocking the transferring of fluid-pressure, created by the compressor piston, to the servomotor when the function selector is in said adjustment position, through which the rotation remains disengaged independent of the adjustment of the throttle.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |