US3926266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electropneumatic hammer
Assignee: Societe de Prospection et dInventions Techniques SPIT SAS
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Filing: 1974-07-30
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Granted: 1975-12-16
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Expires: 1994-07-30
Abstract
Abstract An electropneumatic hammer of the type in which a driving piston is caused to undergo a reciprocating movement of translation under the action of an electric motor and a striking piston is driven by the driving piston, with the striking piston and the driving piston being mounted in a sleeve, the striking piston being disposed in such a manner as to impart a strike to a tool mounted in a tool-holder spindle, the driving piston being adapted to transmit, in the course of its reciprocating movements of translation, an alternating movement of rotation to the sleeve, the sleeve being connected to rotate with the tool through unidirectional connecting means, and means for imparting to the driving piston, in the course of its reciprocating movements of translation, an alternating movement of rotation about an axis parallel to its direction of translation.
Inventors
- 👤 Roger Dorgnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/06; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18024
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
An electropneumatic hammer of the type including a rotatable sleeve member having an axis, a driving piston mounted in said sleeve member for reciprocating movement along the axis of the sleeve member, an electric motor for effecting the reciprocating movement, a tool-holder spindle, and a striking piston mounted in said sleeve member and dRiven by said driving piston, the striking piston being disposed in such a manner as to impart a strike to a tool mounted in the tool-holder spindle, the improvement comprising: means for causing reciprocal rotational movement of said sleeve member about its axis upon reciprocation of said driving piston in a direction parallel to the axis of said sleeve member, means for causing reciprocal rotational movement of said driving piston about the axis of said sleeve member upon the reciprocating movement of said driving piston which can add to or subtract from the reciprocal rotational movement of the sleeve member imparted to it by the reciprocation of the driving piston, and means for translating the reciprocal rotational movements of the sleeve member into unidirectional rotation of the toolholder spindle.
Claim 2
Dependent Claim
182 words
An electropneumatic hammer of the type including a rotatable sleeve member having an axis, a driving piston mounted in said sleeve member for reciprocating movement along the axis of the sleeve member, an electric motor for effecting the reciprocating movement, a tool-holder spindle, and a striking piston mounted in said sleeve member and dRiven by said driving piston, the striking piston being disposed in such a manner as to impart a strike to a tool mounted in the tool-holder spindle, the improvement comprising: means for causing reciprocal rotational movement of said sleeve member about its axis upon reciprocation of said driving piston in a direction parallel to the axis of said sleeve member, means for causing reciprocal rotational movement of said driving piston about the axis of said sleeve member upon the reciprocating movement of said driving piston which can add to or subtract from the reciprocal rotational movement of the sleeve member imparted to it by the reciprocation of the driving piston, and means for translating the reciprocal rotational movements of the sleeve member into unidirectional rotation of the toolholder spindle.
Claim 3
Dependent Claim
36 words
The hammer as claimed in claim 1 further including means for adjusting the amount of reciprocal rotational movement of said driving piston so that the amount of reciprocal rotation of said sleeve member can be varied.
Claim 4
Dependent Claim
40 words
The hammer as claimed in claim 2 wherein said means for causing reciprocal rotational movement of said sleeve member includes a cam slot in said sleeve member and a projection attached to said driving piston and extending into said slot.
Claim 5
Dependent Claim
44 words
The hammer as claimed in claim 3 wherein the means for causing the reciprocal rotational movement of said driving piston includes a slideway mounted exteriorly of the sleeve member and means projecting from said driving piston and sleeve member into engagement with said slideway.
Claim 6
Dependent Claim
30 words
The hammer as claimed in claim 4 further including means for mounting said slideway so that it is inclinable about an axis perpendicular to the axis of said sleeve member.
Claim 7
Dependent Claim
21 words
The hammer as claimed in claim 5 further including a ball joint connection between said driving piston and said electric motor.
Claim 8
Dependent Claim
22 words
The hammer as claimed in claim 6 further including a torque limiter interposed between the electric motor and the ball joint connection.
Claim 9
Dependent Claim
20 words
The hammer as claimed in claim 4 further including a free-wheel mechanism connecting said sleeve member and the tool-holder spindle.
Claim 10
Dependent Claim
20 words
The hammer as claimed in claim 4 further including a pawl system connecting said sleeve member and the tool-holder spindle.
Claim 11
Dependent Claim
30 words
The hammer as claimed in claim 4 including a housing, the sleeve member extending axially of and being mounted in the housing, and the slideway being mounted in the housing.
References Cited (Backward Citations)
US3275088A
Cited
US3850255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |