Patent US5039249A successfully refreshed from Google Patents.
US5039249A
Expired / Lapsed
US
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Apparatus for screening and trowelling concrete
Assignee: Individual
•
Filing: 1989-08-18
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Granted: 1991-08-13
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Expires: 2009-08-18
Abstract
Abstract Disclosed is an apparatus for screeding or trowelling concrete or similar materials. The apparatus has a turret, mounted on a mobile frame. A telescopic boom is mounted in cantilevered fashion on the turret. A machine head, mounted on the distal end of the boom, is rotatable about a vertical axis. An attachment, such as a screed or a trowel, is attached to the machine head. The level and angle of the frame can be set to a selected elevation relative to a rotating laser beam by raising or lowering three hydraulic legs. The machine head can raise or lower the attachment to set the attachment at a selected elevation.
Inventors
- 👤 Joel D. Hansen
- 👤 Meloy F. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:07
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/22; E01C19/30; E01C19/34; E01C19/40; E04; E04F; E04F21/00; E04F21/20; E04F21/24; E04F21/241; E04F21/242
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
62 words
An apparatus for screeding concrete, comprising; a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis; and a screed attachment connected to the machine head for screeding the concrete.
Claim 2
Independent Claim
62 words
An apparatus for screeding concrete, comprising; a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis; and a screed attachment connected to the machine head for screeding the concrete.
Claim 3
Dependent Claim
19 words
An apparatus as defined in claim 1, further comprising means for setting the screed attachment at a selected elevation.
Claim 4
Dependent Claim
64 words
An apparatus as defined in claim 2, wherein the means for setting the screed attachment at a selected elevation comprises: a laser receiver for sensing the elevation of a laser beam periodically moving in a horizontal plane; and adjustment means responsive to the laser receiver for adjusting the elevation of the screed attachment to a predetermined relationship to the plane of the laser beam.
Claim 5
Dependent Claim
15 words
An apparatus as defined in claim 1, further comprising leveling means for leveling the frame.
Claim 6
Dependent Claim
33 words
An apparatus as defined in claim 4, wherein the leveling means includes a pair of inclinometers mounted on the frame in order to sense the level of the frame along two perpendicular lines.
Claim 7
Dependent Claim
19 words
An apparatus as defined in claim 1, further comprising a plurality of nonlinear adjustable legs attached to the frame.
Claim 8
Dependent Claim
19 words
An apparatus as recited in claim 1, further comprising propulsion means for moving the frame over a support surface.
Claim 9
Independent Claim
151 words
An apparatus for screeding concrete, comprising: a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on one end of the boom, the machine head being rotatable about a vertical axis; a screed attachment connected to the machine head for screeding the concrete; three nonlinear adjustable legs for supporting the frame; a laser receiver for sensing the elevation of a laser beam periodically moving in a horizontal plane; adjustment means responsive to the laser receiver for adjusting the elevation of the screed attachment to a predetermined relationship to the plane of the laser beam; leveling means for leveling the frame, including a pair of inclinometers mounted on the frame in order to sense the level of the frame along two perpendicular lines; and propulsion means for moving the frame over a support surface.
Claim 10
Independent Claim
151 words
An apparatus for screeding concrete, comprising: a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on one end of the boom, the machine head being rotatable about a vertical axis; a screed attachment connected to the machine head for screeding the concrete; three nonlinear adjustable legs for supporting the frame; a laser receiver for sensing the elevation of a laser beam periodically moving in a horizontal plane; adjustment means responsive to the laser receiver for adjusting the elevation of the screed attachment to a predetermined relationship to the plane of the laser beam; leveling means for leveling the frame, including a pair of inclinometers mounted on the frame in order to sense the level of the frame along two perpendicular lines; and propulsion means for moving the frame over a support surface.
Claim 11
Independent Claim
61 words
An apparatus for trowelling concrete, comprising: a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis; and a trowel connected to the machine head for trowelling the concrete.
Claim 12
Independent Claim
61 words
An apparatus for trowelling concrete, comprising: a frame; a turret mounted on the frame for rotation about a vertical axis; a telescopic boom mounted in cantilevered fashion on the turret; a machine head mounted on the end of the boom, the machine head being rotatable about a vertical axis; and a trowel connected to the machine head for trowelling the concrete.
Claim 13
Dependent Claim
23 words
An apparatus as defined in claim 9, wherein the trowel can be removed and replaced with a screed attachment for screeding the concrete.
Claim 14
Dependent Claim
18 words
An apparatus as defined in claim 9, further comprising means for setting the trowel at a selected elevation.
Claim 15
Dependent Claim
62 words
An apparatus as defined in claim 11, wherein the means for setting the trowel at a selected elevation comprises: a laser receiver for sensing the elevation of a laser beam periodically moving in a horizontal plane; and adjustment means responsive to the laser receiver for adjusting the elevation of the trowel to a predetermined relationship to the plane of the laser beam.
Claim 16
Dependent Claim
15 words
An apparatus as defined in claim 9, further comprising leveling means for leveling the frame.
Claim 17
Dependent Claim
33 words
An apparatus as defined in claim 13, wherein the leveling means includes a pair of inclinometers mounted on the frame in order to sense the level of the frame along two perpendicular lines.
Claim 18
Dependent Claim
19 words
An apparatus as defined in claim 9, further comprising a plurality of nonlinear adjustable legs attached to the frame.
Claim 19
Dependent Claim
19 words
An apparatus as defined in claim 9, further comprising propulsion means for moving the frame over a support surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |