US4911581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-cast concrete pile and method and apparatus for its introduction into the ground
Assignee: Delmag Maschinenfabrik Reinhold Dornfeld GmbH and Co
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Filing: 1987-05-20
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Granted: 1990-03-27
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Expires: 2007-05-20
Abstract
Abstract An apparatus for screwing a concrete pile (10) into ground comprises a rotary drive (26, 40, 42) and a linear drive (46, 48) both acting on the pile. An angle indicator (58) is associated to the rotary drive (26, 40, 42) and a linear position indicator cooperates with the linear drive (46, 48). A control unit (60) receives the output signals of the angle indicator (58) and the linear position indicator (56) and provides control signals to the rotary drive (26, 40, 42) and the linear drive (42, 48) corresponding to the pitch of the helical rib (16) formed on the concrete pile (10).
Inventors
- 👤 Magnus Mauch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
E; E02; E02D; E02D7/00; E02D7/22; E02D5/00; E02D5/22; E02D5/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
Apparatus for screwing as concrete pile into the ground, said concrete pile having a helical rib arrangement on its exterior surface, said apparatus comprising: (a) drive means (26, 40, 42), for rotatably driving a concrete pile into the ground which includes engaging means (24) that is adapted to engage the upper end (22) of a concrete pile (10), (b) positioning means (46, 48) for moving said drive means (26, 40, 42) along the axis of rotation with respect to the ground, (c) an angle indicator (58) associated with said drive means (26, 40, 42), (d) a linear position indicator (56) associated with said positioning means (46, 48), (e) a control unit (60) for receiving output signals from said angle indicator (58) and said linear position indicator (56) and then generating output signals which control said drive means (26, 40, 42) and said positioning means (46, 48).
Claim 2
Dependent Claim
146 words
Apparatus for screwing as concrete pile into the ground, said concrete pile having a helical rib arrangement on its exterior surface, said apparatus comprising: (a) drive means (26, 40, 42), for rotatably driving a concrete pile into the ground which includes engaging means (24) that is adapted to engage the upper end (22) of a concrete pile (10), (b) positioning means (46, 48) for moving said drive means (26, 40, 42) along the axis of rotation with respect to the ground, (c) an angle indicator (58) associated with said drive means (26, 40, 42), (d) a linear position indicator (56) associated with said positioning means (46, 48), (e) a control unit (60) for receiving output signals from said angle indicator (58) and said linear position indicator (56) and then generating output signals which control said drive means (26, 40, 42) and said positioning means (46, 48).
Claim 3
Dependent Claim
54 words
Apparatus according to claim 1 wherein said drive means (26, 40, 42) and said positioning means (46, 48) are hydraulic motors and said control unit (60) includes servo-restrictors (78, 80, 82, 84), which are connected in one of the connecting lines of said drive means (26, 40, 42) and said positioning means (46, 48).
Claim 4
Dependent Claim
18 words
Apparatus according to claim 1 which includes a sensor for the torque necessary for driving-in said concrete pile.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 3 wherein the output signal of said torque sensor is used for specifying an insertion speed.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 2 which includes a sensor for the torque necessary for driving-in said concrete pile.
Claim 7
Dependent Claim
21 words
Apparatus according to claim 5 wherein the output signal of said torque sensor is used for specifying the reference insertion speed.
References Cited (Backward Citations)
SU286605A1
Cited
GB191128888A
Cited
FR501464A
Cited
GB609613A
Cited
GB849413A
Cited
US3277968A
Cited
US3327789A
Cited
GB1125853A
Cited
US4147457A
Cited
FR2369388A1
Cited
GB1552162A
Cited
JPS5719417A
Cited
US4621950A
Cited
JPS59138613A
Cited
US4708530A
Cited
US4614462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |