US3574404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digging apparatus
Assignee: H B ZACHRY Co
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Filing: 1969-05-12
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Granted: 1971-04-13
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Expires: 1989-05-12
Abstract
Abstract An improvement in an apparatus for creating repetitive explosions from an outlet of a combustion chamber by actuating a digging assembly by the explosive pressures to loosen and break up hard materials. The use of piston-driven digging teeth for loosening and breaking up material formations both prior to and simultaneously with material displacement by repetitive explosive blasts. An apparatus positioning locking assembly including a piston-driven pin actuated by the repetitive explosive blasts into position for holding the apparatus in position and which is actuated either prior to or simultaneously with the material displacement blasts and digging assembly actuation.
Inventors
- 👤 Thomas J Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:43
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/30; E02F5/32; E02F5/323; E02F3/00; E02F3/04; E02F3/88; E02F3/8883
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, said piston including a door hinged at one side, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, said digging means including a plurality of ripping teeth for penetration and loosening of hard materials, and means limiting the travel of the piston and the digging means.
Claim 2
Dependent Claim
92 words
In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, said piston including a door hinged at one side, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, said digging means including a plurality of ripping teeth for penetration and loosening of hard materials, and means limiting the travel of the piston and the digging means.
Claim 3
Dependent Claim
115 words
In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, means limiting the travel of the piston and the digging means, a second piston in communication with the combustion chamber, and a pin connected to one side of the piston remote from the combustion chamber and positioned to be extended downwardly as the piston is actuated thereby acting to hold the apparatus in position when the digging assembly is actuated.
Claim 4
Dependent Claim
115 words
In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, means limiting the travel of the piston and the digging means, a second piston in communication with the combustion chamber, and a pin connected to one side of the piston remote from the combustion chamber and positioned to be extended downwardly as the piston is actuated thereby acting to hold the apparatus in position when the digging assembly is actuated.
Claim 5
Dependent Claim
24 words
The apparatus of claim 2 including valve means sealing off the combustion chamber from the first piston until the second piston has been actuated.
Claim 6
Dependent Claim
153 words
In combination with an apparatus displacing material by applying combustion pressure from the repetitive ignition of a hydrocarbon fuel/air mixture from the outlet of a combustion chamber against the material, a digging assembly comprising: a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurality of ripper teeth connected to the door on the side remote from combustion chamber for engaging the material to be broken up, a piston locking assembly including: a second piston in communication with the combustion chamber, and a pin connected to the piston on the side remote from the combustion chamber and positioned to be extended downwardly as the second piston is actuated thereby acting to hold the apparatus in position when the fuel/air mixture is ignited, and valve means sealing off the combustion chamber from the door until the second piston has been actuated.
Claim 7
Dependent Claim
153 words
In combination with an apparatus displacing material by applying combustion pressure from the repetitive ignition of a hydrocarbon fuel/air mixture from the outlet of a combustion chamber against the material, a digging assembly comprising: a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurality of ripper teeth connected to the door on the side remote from combustion chamber for engaging the material to be broken up, a piston locking assembly including: a second piston in communication with the combustion chamber, and a pin connected to the piston on the side remote from the combustion chamber and positioned to be extended downwardly as the second piston is actuated thereby acting to hold the apparatus in position when the fuel/air mixture is ignited, and valve means sealing off the combustion chamber from the door until the second piston has been actuated.
Claim 8
Dependent Claim
97 words
In combination with an apparatus for creating repetitive explosions from an outlet of a combustion chamber by the ignition of a hydrocarbon fuel/air mixture, a soil ripping assembly comprising: the outlet of the combustion chamber being positioned about the soil, a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurAlity of ripper teeth connected to said door and extending downwardly and directed forwardly below said outlet and into the soil for loosening the soil, and means for towing said apparatus across the soil.
Claim 9
Dependent Claim
97 words
In combination with an apparatus for creating repetitive explosions from an outlet of a combustion chamber by the ignition of a hydrocarbon fuel/air mixture, a soil ripping assembly comprising: the outlet of the combustion chamber being positioned about the soil, a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurAlity of ripper teeth connected to said door and extending downwardly and directed forwardly below said outlet and into the soil for loosening the soil, and means for towing said apparatus across the soil.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |