US4965973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for load carrying structures
Assignee: Individual
•
Filing: 1988-04-06
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Granted: 1990-10-30
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Expires: 2008-04-06
Abstract
Abstract To improve the utilization of the volume of the material in the middle of the cross-section of load carrying construction, for example, laminated wooden beams, and to increase the stiffness and bending strength, combinations of structural components, such as laminated wooden beams and lamells, which are curved in presses while the components are assembled, may be used. After being removed from the presses, planned and permanent pre-stresses will be introduced into the entire construction units. Reinforcing components, such as steel, can also be used in combination with the above described methods of construction.
Inventors
- 👤 Arne Engebretsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:27
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/12; E04C3/18; E04C3/14
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
90 words
In a device for load carrying structures comprising a prestressed reinforced beam of laminated wood having a longitudinal axis, the improvement comprising said reinforced laminated wood beam having a curved convex tension side and a curved concave compression side in its unloaded condition, the reinforcement of said beam comprising a longitudinally extending reinforcing element having a strength greater than wood and being fixed only to said curved convex tension side of said beam so that the longitudinal axes of said reinforcing element and said beam are parallel to one another.
Claim 2
Dependent Claim
90 words
In a device for load carrying structures comprising a prestressed reinforced beam of laminated wood having a longitudinal axis, the improvement comprising said reinforced laminated wood beam having a curved convex tension side and a curved concave compression side in its unloaded condition, the reinforcement of said beam comprising a longitudinally extending reinforcing element having a strength greater than wood and being fixed only to said curved convex tension side of said beam so that the longitudinal axes of said reinforcing element and said beam are parallel to one another.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said reinforcing element is bonded to said convex tension side of said beam.
Claim 4
Dependent Claim
25 words
The device of claim 1 wherein said reinforcing element is affixed to said convex tension side of said beam by means of bolts or screws.
Claim 5
Dependent Claim
19 words
The device of claim 3 wherein said reinforcing element is bonded to said convex tension side of said beam.
Claim 6
Dependent Claim
11 words
The device of claim 1 wherein said reinforcing element comprises metal.
Claim 7
Dependent Claim
10 words
The device of claim 5 wherein said metal is steel.
Claim 8
Dependent Claim
13 words
The device of claim 1 wherein said reinforcing element comprises wood and metal.
Claim 9
Dependent Claim
10 words
The device of claim 7 wherein said metal is steel.
Claim 10
Dependent Claim
20 words
The device of claim 7 wherein said wood and steel are bonded to said convex tension side of said beam.
Claim 11
Dependent Claim
16 words
The device of claim 1 wherein said reinforcing element comprises a plurality of slender reinforcing elements.
Claim 12
Dependent Claim
13 words
The device of claim 1 wherein said reinforcing element comprises a polymeric material.
Claim 13
Dependent Claim
24 words
The device of claim 11 wherein said polymeric material is selected from a group consisting of thermosetting plastic, epoxy, polycarbonate and fiberglass-reinforced resin materials.
Claim 14
Dependent Claim
11 words
The device of claim 1 wherein said reinforcing element comprises concrete.
Claim 15
Dependent Claim
12 words
The device of claim 1 wherein said reinforcing element comprises reinforced concrete.
Claim 16
Dependent Claim
12 words
The device of claim 1 wherein said reinforcing element comprises carbon filaments.
Claim 17
Dependent Claim
12 words
The device of claim 1 wherein said reinforcing element comprises graphite filaments.
Claim 18
Dependent Claim
128 words
In a device for load carrying structures comprising a prestressed reinforced beam of laminated wood having a longitudinal axis, the improvement comprising said reinforced laminated wood beam having a curved convex tension side and a curved concave compression side in its unloaded condition, the reinforcement of said beam comprising a longitudinally extending reinforcing element having a strength greater than wood and being fixed only to said curved convex tension side of said beam so that the longitudinal axes of said reinforcing element and said beam are parallel to one another wherein a longitudinal groove is formed in said beam extending the entire length of said beam along its longitudinal axis at the curved convex tension side of the beam, and said reinforcing element is disposed within said groove.
Claim 19
Dependent Claim
128 words
In a device for load carrying structures comprising a prestressed reinforced beam of laminated wood having a longitudinal axis, the improvement comprising said reinforced laminated wood beam having a curved convex tension side and a curved concave compression side in its unloaded condition, the reinforcement of said beam comprising a longitudinally extending reinforcing element having a strength greater than wood and being fixed only to said curved convex tension side of said beam so that the longitudinal axes of said reinforcing element and said beam are parallel to one another wherein a longitudinal groove is formed in said beam extending the entire length of said beam along its longitudinal axis at the curved convex tension side of the beam, and said reinforcing element is disposed within said groove.
Claim 20
Dependent Claim
14 words
The device of claim 11 wherein said reinforcing element is a round steel rod.
Claim 21
Dependent Claim
24 words
The device of claim 12 wherein an epoxy resin fills the space between said rod and said groove, bonding the rod to the beam.
Claim 22
Dependent Claim
35 words
The device of claim 13 wherein the groove and rod are so dimensioned that the rod is completely contained within the groove, so that the rod is completely contained within the dimensions of the beam.
Claim 23
Dependent Claim
13 words
The device of claim 11 wherein said reinforcing element comprises a polymeric material.
Claim 24
Dependent Claim
24 words
The device of claim 21 wherein said polymeric material is selected from a group consisting of thermosetting plastic, epoxy, polycarbonate and fiberglass-reinforced resin materials.
Claim 25
Dependent Claim
11 words
The device of claim 11 wherein said reinforcing element comprises concrete.
Claim 26
Dependent Claim
12 words
The device of claim 11 wherein said reinforcing element comprises reinforced concrete.
Claim 27
Dependent Claim
12 words
The device of claim 11 wherein said reinforcing element comprises carbon filaments.
Claim 28
Dependent Claim
12 words
The device of claim 11 wherein said reinforcing element comprises graphite filaments.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |