Patent US3750210A successfully refreshed from Google Patents.
US3750210A
Expired / Lapsed
US
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Apparatus for the construction of bridges
Assignee: UK Secretary of State for Defence
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Filing: 1971-08-04
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Granted: 1973-08-07
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Expires: 1991-08-04
Abstract
Abstract Apparatus for the construction of bridges incorporating piers pivoted to a transverse structure which may be an integral part of a bridge span or a cross-beam on which a span is supported. The piers can pivot in a plane transverse to the bridge and are normally maintained at a predetermined angle to the transverse structure by hydraulic articulators connected to piers and transverse structure across the angle therebetween. The articulators incorporate a valve actuable when the articulators are subjected to a predetermined load to permit a change of length of the articulator and a consequent variation of the angle between piers and transverse structure and thus to relieve excessive stresses on the bridge structure.
Inventors
- 👤 J Barnard
- 👤 D Knight
- 👤 E Longbottom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:27
CPC Classifications
E; E01; E01D; E01D19/00; E01D19/02; E01D19/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
Apparatus for the construction of a bridge comprising a transverse structure; piers pivotally connected to said transverse structure for articulation in a plane transverse to the bridge; hydraulic articulators each operatively connected to a pier and to the transverse structure and extending obliquely across the angle therebetween to maintain said angle, normally, at a predetermined value; and a valve in each articulator, operative when a predetermined critical load on the articulator is exceeded, to permit change of length of the articulator and variation of the said angle.
Claim 2
Dependent Claim
87 words
Apparatus for the construction of a bridge comprising a transverse structure; piers pivotally connected to said transverse structure for articulation in a plane transverse to the bridge; hydraulic articulators each operatively connected to a pier and to the transverse structure and extending obliquely across the angle therebetween to maintain said angle, normally, at a predetermined value; and a valve in each articulator, operative when a predetermined critical load on the articulator is exceeded, to permit change of length of the articulator and variation of the said angle.
Claim 3
Dependent Claim
18 words
Apparatus as claimed in claim 1 wherein the transverse structure is an integral part of a bridge span.
Claim 4
Dependent Claim
21 words
Apparatus as claimed in claim 1 wherein the transverse structure is a cross-beam on which a bridge span can be supported.
Claim 5
Dependent Claim
43 words
Apparatus as claimed in claim 1 incorporating tubular hip members pivoted to the transverse structure and in which the piers are mounted, each articulator being operatively connected to a hip member and through said member to a pier and to the transverse structure.
Claim 6
Dependent Claim
20 words
Apparatus as claimed in claim 4 incorporating internal guides within the hip members to form bearing surfaces for the piers
Claim 7
Dependent Claim
14 words
Apparatus as claimed in claim 5 wherein the internal guides are pads of polytetrafluoroethylene.
Claim 8
Dependent Claim
104 words
Apparatus as claimed in claim 1 wherein each hydraulic articulator is a hydraulic ram comprising a cylinder operatively connected to one of a pier and the transverse structure; a ram incorporating a piston slidable longitudinally within the cylinder and operatively connected to the other of a pier and the transverse structure; and a hydraulic circuit connecting chambers on each side of the piston and including a release valve operative when a predetermined pressure is exceeded in one of said chambers to permit an extension or contraction of the articulator and a consequent change in the angle between the associated pier and the transverse structure.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |