US3777825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer drilling machine
Assignee: Impex Essen Vertrieb von Werkzeugen GmbH
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Filing: 1972-07-07
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Granted: 1973-12-11
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Expires: 1992-07-07
Abstract
Abstract A hammer drilling machine selectively switchable between pure drilling and hammer drilling modes operates with reduced frictional heat due to the construction of the percussion mechanism. During hammer drilling there is no relative rotation between the plunger and the drilling spindle. The percussion mechanism includes two co-operable cam members, both of which are stationary when the machine is idling, and one of which is connected to the plunger and is set into rotation with the machine in the hammer drilling mode by axial displacement of the drilling spindle.
Inventors
- 👤 R Gullich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:52
CPC Classifications
B; B25; B25D; B25D16/00; B25D16/006; B25D2211/00; B25D2211/06; B25D2211/062; B25D2211/064
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A hammer drilling machine comprising gearing which can be switched selectively between drilling and hammer drilling mOdes of operation, a drilling spindle which is mounted for limited axial displacement, and a percussion mechanism arranged symmetrically about the drilling spindle, said percussion mechanism comprising a plunger which is subject to the action of spring means and is axially displaceable relative to the drilling spindle, and two co-operable cam members, one of which is connected to the plunger, wherein both cam members remain stationary when the machine is idling and wherein said cam member connected to the plunger is arranged to be set into rotation with the machine in the hammer drilling mode by axial displacement of the drilling spindle.
Claim 2
Dependent Claim
118 words
A hammer drilling machine comprising gearing which can be switched selectively between drilling and hammer drilling mOdes of operation, a drilling spindle which is mounted for limited axial displacement, and a percussion mechanism arranged symmetrically about the drilling spindle, said percussion mechanism comprising a plunger which is subject to the action of spring means and is axially displaceable relative to the drilling spindle, and two co-operable cam members, one of which is connected to the plunger, wherein both cam members remain stationary when the machine is idling and wherein said cam member connected to the plunger is arranged to be set into rotation with the machine in the hammer drilling mode by axial displacement of the drilling spindle.
Claim 3
Dependent Claim
36 words
A hammer drilling machine according to claim 1, in which the other of the cam members is permanently fixed in position and is machined into a lock nut connected into a housing for the percussion mechanism.
Claim 4
Dependent Claim
34 words
A hammer drilling machine according to claim 1, in which said cam member connected to the plunger is coupled to the drilling spindle with the machine in the hammer drilling mode through the plunger.
Claim 5
Dependent Claim
20 words
A hammer drilling machine according to claim 3, in which said one cam member is machined directly from the plunger.
Claim 6
Dependent Claim
76 words
A hammer drilling machine according to claim 3, in which the plunger is arranged to be axially displaceable but non-rotatable on a coupling sleeve which is mounted for rotation and limited axial movement on the drilling spindle, said sleeve having at its one end coupling means for engagement with coupling means on the drilling spindle and supporting at its other end said spring means which is arranged to be stressed by axial movement of the plunger.
Claim 7
Dependent Claim
29 words
A hammer drilling machine according to claim 5, in which the coupling sleeve is provided at its said other end with an annular supporting member for said spring means.
Claim 8
Dependent Claim
41 words
A hammer drilling machine according to claim 5, in which the coupling sleeve is supported with the machine in the hammer drilling mode by an inner ring of a driving-end drilling spindle roller bearing against the force of said spring means.
Claim 9
Dependent Claim
42 words
A hammer drilling machine according to claim 5, in which a striker plate transmitting the hammer blows of the plunger to the drilling spindle carries said coupling means on the drilling spindle which is engageable with said coupling means on the sleeve.
Claim 10
Dependent Claim
31 words
A hammer drilling machine according to claim 1, in which the end of the drilling spindle to which the rotary driving force is imparted carries an axially displaceable driving gear wheel.
Claim 11
Dependent Claim
25 words
A hammer drilling machine according to claim 9, in which the driving gear wheel has an inclined tooth periphery urging it in the feed direction.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |