Patent US3576311A successfully refreshed from Google Patents.
US3576311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post extractor
Assignee: Individual
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Filing: 1968-11-18
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Granted: 1971-04-27
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Expires: 1988-11-18
Abstract
Abstract A light weight, simple, effective, hydraulically operated device for dislodging and extracting poles or similar structures from the ground. In one embodiment, a hydraulically operated piston pulls directly upward on a chain or strap directly attached to the post or pole to be dislodged while an arm attached to both the chain and piston and a frame allowing the arm to pivot as the post is pulled upward operate to minimize side forces on the piston arm. An adapter, for pulling long poles that have holes only near the top is also disclosed.
Inventors
- 👤 Jack O Cartner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:21
CPC Classifications
E; E02; E02D; E02D9/00; E02D9/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A device for extracting posts comprising: linear hydraulic drive means having a generally vertical arm which is driven upward by the application of hydraulic pressure; ground-engaging frame means supporting said drive means and including a guide arm pivotally mounted near one end for swinging movement in a vertical plane, said guide arm being pivotally connected near its other end to the upper end of said generally vertical arm; and adapter means attachable to said post being extracted and to said guide arm in approximately the same location as said generally vertical arm.
Claim 2
Independent Claim
92 words
A device for extracting posts comprising: linear hydraulic drive means having a generally vertical arm which is driven upward by the application of hydraulic pressure; ground-engaging frame means supporting said drive means and including a guide arm pivotally mounted near one end for swinging movement in a vertical plane, said guide arm being pivotally connected near its other end to the upper end of said generally vertical arm; and adapter means attachable to said post being extracted and to said guide arm in approximately the same location as said generally vertical arm.
Claim 3
Dependent Claim
38 words
Apparatus as in claim 1 wherein said adapter includes a chain connected to said guide arm, a hook connected to said chain, and an adapter member connected to said hook and adapted to be fastened to said post.
Claim 4
Dependent Claim
55 words
A device as in claim 1 wherein said adapter comprises: a elongate channellike member having holes therein for securing said channel to a post; a lower member attached to said channel member and having a hook means connected thereto for attachment to said guide arm; and means for connecting said post to said elongate member.
Claim 5
Independent Claim
156 words
A device for extracting posts comprising: linear hydraulic drive means having a generally vertical arm which is driven upward by the application of hydraulic pressure, frame means including a generally vertical support member, two horizontal legs attached at one end to said support member, each exTending from the point of attachment generally horizontally to form a V and each engageable with the ground so that the post to be extracted is disposed between said legs, a guide arm pivotably mounted on the end of said support member opposite the end to which the legs are attached for swinging movement in a vertical plane, said guide arm being pivotably connected near its other end to the upper end of the said general vertical arm, means for attaching said post to said guide arm in approximately the same location as said generally vertical arm, and means for receiving hydraulic pressure and communicating said pressure to said drive means.
Claim 6
Independent Claim
156 words
A device for extracting posts comprising: linear hydraulic drive means having a generally vertical arm which is driven upward by the application of hydraulic pressure, frame means including a generally vertical support member, two horizontal legs attached at one end to said support member, each exTending from the point of attachment generally horizontally to form a V and each engageable with the ground so that the post to be extracted is disposed between said legs, a guide arm pivotably mounted on the end of said support member opposite the end to which the legs are attached for swinging movement in a vertical plane, said guide arm being pivotably connected near its other end to the upper end of the said general vertical arm, means for attaching said post to said guide arm in approximately the same location as said generally vertical arm, and means for receiving hydraulic pressure and communicating said pressure to said drive means.
References Cited (Backward Citations)
US2675209A
Cited
US3048368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |