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US 4,787,183 AGranted
Truss arrangement
AssigneeAluma Systems Incorporated
InventorRonald J. Johnston
Life of this patent
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AssigneeAluma Systems Incorporated
InventorRonald J. Johnston
Estimating the term…
The present invention discloses a new concrete forming system and components therefor, particularly adapted for forming of vaulted ceilings and for use in buildings wherein the floors at the edges thereof have upwardly extending sills and/or wherein the ceilings have been dropped by a similar ledge or sill thereby significantly reducing the clear area through which a truss can be removed. The truss comprises a top chord and a bottom chord interconnected by upright members and diagonal bracing members. A number of adjustable extension legs are associated with the upright members and are telescopically received within an upright member such that a leg extending to the upper side of the truss can overlap with a leg extending to the lower side of the truss, whereby the legs extending above the truss can be adjusted and maintained independent of the legs extending below the truss. In contrast to the prior art practice of having the upper chord of the truss at the lowest level of the ceiling with "packing" thereabove to define and support the concrete forming surface. The present system provides load collecting support beams adjustably secured above the upper chord of the truss by extendable legs whereby the position of the support beam can vary relative to the top chord of the truss. The height of the truss is used to accommodate the extendable legs which position the truss above the floor as well as the extendable legs supporting the load collecting beam, whereby the amount of packing and the time required to initially set up the system for a given building are reduced. Therefore, the present invention relates to improvements in flying forms and components thereof and in particular to a system which is more flexible and adjustable for the forming of vaulted ceilings.
A truss for use in concrete forming comprising a top chord and a bottom chord interconnected by upright members and diagonal bracing members, at least some of said upright members being of a shape for receiving adjustable extension legs each of a length substantially greater than half the distance spacing said top chord and said bottom chord, said upright members receiving adjustable extension legs to extend beyond said bottom chord for supporting said truss and beyond said top chord for supporting a load collecting beam, each leg being independently telescopically movable within said truss.
A truss for use in concrete forming, comprising:
A truss for use in concrete forming, comprising:
A system for use in concrete forming comprising parallel opposed trusses interconnected to maintain the relative positions thereof, each of said trusses including a top chord and a bottom chord interconnected by upright members, each upright member including two parallel elongate members extending between said top and bottom chord with said members secured to the top and bottom of said truss for telescopically receiving extension means extending above and below said truss, said extension means extending below said truss including adjustable legs for supporting said truss above a surface, said extension means extending above said truss supporting at least one load collecting beam which in turn supports joists generally perpendicular to said load collecting beam for supporting a sheet material partially defining a concrete form, said extension means being adjustable to position such sheet material from said trusses various distances by adjusting the extent to which said extension means extend above said truss and allowing the system to collapse by telescopic movement of said legs within the associated truss in preparation for moving of the form to another level, said system when collapsed having at least some overlap of legs extending below said trusses relative to said extension means which extend above said truss.
A system for concrete forming comprising at least two trusses interconnected to maintain the relative positions thereof, each truss having a first set of extendable legs telescopically associated with upright members of each truss for positioning of the truss at a height above a support surface up to about the height of the truss and a second set of extendable legs telescopically received within upright members of each truss for supporting means for forming a concrete support surface at various heights above said truss determined by said second set of extendable legs, said first set of extendable legs being associated with said upright members of said truss to permit vertical overlap of said first set of legs and said second set of extendable legs in preparation for moving of said system to a different level.
A truss for use in concrete forming comprising a top chord and a bottom chord interconnected by upright members and diagonal bracing members;
An upright member for use in a concrete forming truss comprising means for slidably receiving in the length of said upright member extension legs and, in a manner to limit lateral movement of such extension legs relative to the length of said upright member when received therein, said means for slidably receiving extension legs including two opposed at least recessed portions of a shape for receiving such extension legs and means for connecting said two opposed portions in a parallel relationship said connecting means being of a size and shape for transfering load between said at least recessed portions.
A structure for use in forming multi-level concrete ceilings comprising at least two trusses interconnected to maintain the relative positions thereof, each truss comprising a top chord and a bottom chord, a plurality of upright members extending between the top and bottom chords, a plurality of lower adjustable extension legs telescopically received in at least some of the upright members extendable beyond the bottom chord for supporting the truss, and a plurality of upper adjustable extension legs telescopically received in at least some of the upright members extendable beyond the top chord;
Dependencies are inferred from the claim text.