US3705633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible percussion device for making holes in ground by compacting the latter
Assignee: Institute of Mining
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Filing: 1971-04-05
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Granted: 1972-12-12
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Expires: 1991-04-05
Abstract
Abstract A reversible, pneumatically-operated percussion device having an axially-displacable air-control bushing positionable in one of two positions to correspondingly control forward and reverse movements of the device; the bushing cooperating with a casing and having projections interacting with those on the casing whereby reduction of operating pressure and a cooperating spring effect reversal of the impact effected by a percussor reciprocably supported in the housing of the device.
Inventors
- 👤 Boris Vasilievic Sudinishnikov
- 👤 Alexandr Dmitrievich Kostylev
- 👤 Konstantin Stepandvich Gurkov
- 👤 Konstantin Konstantin Tupitsyn
- 👤 Vladimir Dmitrievich Plavskikh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14; E21B4/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A reversible percussion device comprising a housing including a Working end and an internal space; a percussor reciprocatably disposed in said space of the housing and forming therein opposed, variable-volume working chambers; means operating to cause said percussor to impart to said housing percussions during its reciprocation in the space in the latter under the action of the compressed air supplied alternately into said chambers; a stepped air-supplying bushing mounted in said housing so that it can displace in the axial direction and interacts through a step of a larger diameter with said percussor in the course of movement; said bushing having two rows of chamfered projections provided on the outer surface of a smaller diameter; a casing mounted on the step of a smaller diameter of said air-supplying bushing between said rows of the projections and rigidly secured to said housing; said casing having chamfered projections provided at the butt ends thereof and interacting during the reversing of the device movement the respective rows of the projections provided on said bushing.
Claim 2
Dependent Claim
172 words
A reversible percussion device comprising a housing including a Working end and an internal space; a percussor reciprocatably disposed in said space of the housing and forming therein opposed, variable-volume working chambers; means operating to cause said percussor to impart to said housing percussions during its reciprocation in the space in the latter under the action of the compressed air supplied alternately into said chambers; a stepped air-supplying bushing mounted in said housing so that it can displace in the axial direction and interacts through a step of a larger diameter with said percussor in the course of movement; said bushing having two rows of chamfered projections provided on the outer surface of a smaller diameter; a casing mounted on the step of a smaller diameter of said air-supplying bushing between said rows of the projections and rigidly secured to said housing; said casing having chamfered projections provided at the butt ends thereof and interacting during the reversing of the device movement the respective rows of the projections provided on said bushing.
Claim 3
Dependent Claim
49 words
A reversible percussion device according to claim 1, including a spring normally reacting between said casing and the step of a larger diameter of said air-supplying bushing for effecting axial displacement of said bushing upon discontinuation of the supply of the compressed air into the chambers of the device.
Claim 4
Dependent Claim
29 words
A reversible percussion device according to claim 1, in which the interacting butt ends of the projections of said air-supplying bushing and said casing are formed as screw surfaces.
Claim 5
Dependent Claim
29 words
A reversible percussion device according to claim 2, in which the interacting butt ends of the projections of said air-supplying bushing and said casing are formed as screw surfaces.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |