Patents Assigned to Mabey & Johnson Limited
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Patent number: 6804927Abstract: A modular system for the construction of a lattice panel for a bridge, comprises first and second chord members (20, 28) and a plurality of web members (1). Each web member comprises three legs forming a triangle. One leg (2) extends perpendicularly between the chord members. The second and third legs (3, 4) are joined to each other and to the ends of the first leg. The ends of the first leg (1) are provided with means for connecting the web member to the chords (20, 28). Interlocking means (13, 19) are provided at the joint between the second and third legs, and mid way along the first leg, so that adjacent web members can be connected together.Type: GrantFiled: March 12, 2003Date of Patent: October 19, 2004Assignee: Mabey & Johnson LimitedInventors: Richard Charles Edward Forsyth, Bevil Guy Mabey, John Meynell Richardson
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Patent number: 6539571Abstract: A system for use in constructing a lattice panel bridge, includes a plurality of substantially rectangular prefabricated steel lattice panels joined in end to end relationship to form a main girder for the bridge. Each panel comprises an upper chord, a lower chord of substantially equal length, a plurality of web members interconnecting the upper and lower chords, and joint forming devices at each end of each chord. The joint forming devices at either end of the lower chord mate and receive a transverse pin for connecting the lower chords of adjacent panels together. The joint forming devices at each end of the upper chord comprises a longitudinally facing plate provided with apertures for receiving fasteners for connecting the plates of adjacent panels together. A spacer is inserted between the plates and this reduces the tendency of the bridge to sag. Optionally the spacers can be used to give the resultant bridge an upwardly facing longitudinal camber.Type: GrantFiled: July 6, 2000Date of Patent: April 1, 2003Assignee: Mabey & Johnson LimitedInventor: Richard Charles Edward Forsyth
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Patent number: 5065467Abstract: A lattice panel (P1) for a bridge has only a single chord (C1), along one side (S1), with no chord along the opposite side (S2), resulting in a cost and weight saving when two such panels are stacked in one plane. A lattice (L) of web members (W) comprises: either n+1 perpendicular web members (Wp1-3) at n+1 "first" nodes (N1. 1-N1.3) or n perpendicular web members (Wp1, Wp2) at all but an end one of n+1 "first" nodes (Wp1, Wp2); 2n "first" oblique web members (Wo1-Wo4) and 2n "second" web members (Wo5-Wo8) form two quadrilateral structures between the n+1 "first" nodes (Wp1, Wp2). Two "fourth" nodes (N4.1, N4.2) are formed by the tops of the quadrilateral structures, for connection to a second chord or to corresponding nodes of a like panel.Type: GrantFiled: May 8, 1990Date of Patent: November 19, 1991Assignee: Mabey & Johnson LimitedInventor: Richard C. E. Forsyth
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Patent number: 4706436Abstract: A lattice bridge construction system is characterised by the provision of lattice panels (A,B,C) which are of substantially identical length but of different depths relative to one another such that when variously combined one with another, with or without additional reinforcement, trusses having considerably more economic increments of bending strength may be achieved.Type: GrantFiled: April 1, 1986Date of Patent: November 17, 1987Assignee: Mabey & Johnson LimitedInventors: Bevil G. Mabey, David G. Mabey
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Patent number: RE34103Abstract: A lattice bridge construction system is characterized by the provision of lattice panels (A,B,C) which are of substantially identical length but of different depths relative to one another such that when variously combined one with another, with or without additional reinforcement, trusses having considerably more economic increments of bending strength may be achieved.Type: GrantFiled: November 17, 1989Date of Patent: October 20, 1992Assignee: Mabey & Johnson LimitedInventors: Bevil G. Mabey, David G. Mabey