US3583499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pile extractor
Assignee: Individual
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Filing: 1969-09-09
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Granted: 1971-06-08
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Expires: 1989-09-09
Abstract
Abstract A pile extractor of the type having a housing suspended from a crane, a ram reciprocable within the housing, and a pulling member having an impact head adapted to be secured to a pile and movable longitudinally in the housing. A cylinder supplied with hydraulic fluid is attached to the top of the housing, having a piston and piston rod movable within the hydraulic cylinder; the piston rod is connected to the ram, and the ram has a longitudinal through bore into which the pulling member extends; a step in the bore forms an impact face for the head of the pulling member accommodated within the bore. An hydraulic accumulator connected to the hydraulic fluid feed line is an integral part of the cylinder. In the preferred modification the pulling member is provided with a shaft and piston movable in a compensating cylinder attached to the bottom of the housing, the compensating cylinder being provided with hydraulic fluid from the hydraulic fluid feed line.
Inventors
- 👤 Hugo Cordes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:32
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/12; E; E02; E02D; E02D9/00; E02D9/02; B25D2250/00; B25D2250/171
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
In apparatus for extracting piles and the like, wherein a housing is suspended from a crane, a ram movable in said housing is provided with a longitudinal through bore, and a pulling member adapted to be attached to a pile is movable longitudinally within Said housing, said pulling member being accommodated within said longitudinal bore of the ram, the improvement which comprises: a cylinder supplied with hydraulic fluid under pressure attached to said housing above said ram; a piston and a downwardly depending piston rod in said cylinder, said piston rod being connected to said ram; said pulling member terminating at its upper end in an enlarged head accommodated within said longitudinal bore in said ram; said longitudinal bore having an inwardly projecting step, said step forming an impact face for said head of said pulling member; and an hydraulic accumulator connected to an hydraulic fluid feed line to said cylinder.
Claim 2
Dependent Claim
151 words
In apparatus for extracting piles and the like, wherein a housing is suspended from a crane, a ram movable in said housing is provided with a longitudinal through bore, and a pulling member adapted to be attached to a pile is movable longitudinally within Said housing, said pulling member being accommodated within said longitudinal bore of the ram, the improvement which comprises: a cylinder supplied with hydraulic fluid under pressure attached to said housing above said ram; a piston and a downwardly depending piston rod in said cylinder, said piston rod being connected to said ram; said pulling member terminating at its upper end in an enlarged head accommodated within said longitudinal bore in said ram; said longitudinal bore having an inwardly projecting step, said step forming an impact face for said head of said pulling member; and an hydraulic accumulator connected to an hydraulic fluid feed line to said cylinder.
Claim 3
Dependent Claim
16 words
Apparatus according to claim 1, including a flexible coupling connecting said ram to said piston rod.
Claim 4
Dependent Claim
61 words
Apparatus according to claim 1, wherein said pulling member incorporates a shaft and a piston, a compensating cylinder is connected to said housing beneath said ram, said shaft and piston being movable longitudinally in said compensating cylinder, and including a connecting line for supplying hydraulic fluid to the space within said compensating cylinder, said connecting line communicating with said feed line.
Claim 5
Dependent Claim
14 words
Apparatus according to claim 3, including a one-way check valve in said connecting line.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 3, wherein said piston is movable longitudinally on said shaft.
Claim 7
Dependent Claim
68 words
Apparatus according to claim 1, wherein said pulling member incorporates a shaft and two pistons, a compensating cylinder is connected to said housing beneath said ram, said pistons being mounted on said shaft for limited longitudinal movement in said compensating cylinder, and including a connecting line for supplying hydraulic fluid to the space in said compensating cylinder between said pistons, said connecting line communicating with said feed line.
Claim 8
Dependent Claim
43 words
Apparatus according to claim 1, including an hydraulic winch secured to said housing, hydraulic feed and return lines connected to said winch supplied by feed and return lines of said cylinder, and a cable on said winch attached to a point of suspension.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |