US3727701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible air-punching mechanism for making holes in soil by compaction
Assignee: Institute of Mining
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Filing: 1971-02-08
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Granted: 1973-04-17
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Expires: 1991-02-08
Abstract
Abstract The invention relates to reversible air-punching mechanisms for making holes in soil by compaction. According to the invention, the mechanism comprises a hollow housing in which a striker reciprocated by compressed air, strikes the housing and thus moves it through the ground. The compressed air is delivered into the working chambers through an air-feed bushing which is provided with two rows of ports getting alternately in line with the corresponding rows of ports in the hollow slide valve accommodated in the bushing as said slide valve turns around its longitudinal axis. For turning the slide valve, it is connected with the bushing by a projection which moves along an enclosed shaped recess during the reciprocating motion of the slide valve when the mechanism is reversed by cutting off momentarily the supply of compressed air to the mechanism.
Inventors
- 👤 B Sudnishnikov
- 👤 V Solomko
- 👤 A Reinsburg
- 👤 K Tupitsyn
- 👤 V Plavskikh
- 👤 A Kostylev
- 👤 K Gurkov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:15
CPC Classifications
E; E02; E02D; E02D3/00; E02D3/02; E02D3/046; E02D3/054; E02D15/00; E02D15/08; E02D3/08; E21; E21B; E21B4/00; E21B4/06; E21B4/14; E21B4/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
264 words
A reversible air-punching apparatus for making holes in soil by compaction, comprising: a hollow housing for said apparatus having a pointed head portion; a reciprocable striker located within said housing adapted to strike the latter during reciprocation therein under the effect of compressed air; a forward variable-volume working chamber defined in said housing by said striker; a rear variable-volume working chamber located in the tail end section of said striker and communicating with said forward chamber through ports formed in said striker; a stepped-diameter air-feed bushing located in said rear chamber of the striker, said bushing having a flange for securing to the tail end section of said housing, said air-feed bushing having two parallel rows of ports formed on its larger diameter step portion interacting with said striker, and exhaust holes being formed on the face surface of said larger diameter step portion; a hollow spring-loaded slide valve being positioned within said air-feed bushing and having two rows of ports separated by a partition on a step portion thereof interacting with said bushing so as to be alternately alignable with the respective rows of ports on the bushing upon said slide valve being turned about its longitudinal axis; said slide valve being connected to said bushing by means of a projection extending along a closed shaped recess in the form of broken lines of identical configuration whereby each apex of one of said lines and an opposite apex of another of said broken lines are offset by an angle ensuring the turning of said slide valve in one direction during its axial movement.
Claim 2
Dependent Claim
264 words
A reversible air-punching apparatus for making holes in soil by compaction, comprising: a hollow housing for said apparatus having a pointed head portion; a reciprocable striker located within said housing adapted to strike the latter during reciprocation therein under the effect of compressed air; a forward variable-volume working chamber defined in said housing by said striker; a rear variable-volume working chamber located in the tail end section of said striker and communicating with said forward chamber through ports formed in said striker; a stepped-diameter air-feed bushing located in said rear chamber of the striker, said bushing having a flange for securing to the tail end section of said housing, said air-feed bushing having two parallel rows of ports formed on its larger diameter step portion interacting with said striker, and exhaust holes being formed on the face surface of said larger diameter step portion; a hollow spring-loaded slide valve being positioned within said air-feed bushing and having two rows of ports separated by a partition on a step portion thereof interacting with said bushing so as to be alternately alignable with the respective rows of ports on the bushing upon said slide valve being turned about its longitudinal axis; said slide valve being connected to said bushing by means of a projection extending along a closed shaped recess in the form of broken lines of identical configuration whereby each apex of one of said lines and an opposite apex of another of said broken lines are offset by an angle ensuring the turning of said slide valve in one direction during its axial movement.
References Cited (Backward Citations)
US3407884A
Cited
GB1170167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |