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US 8,214,957 B2Granted
Bridge and method for manufacturing the bridge
OwnerEnsio Johannes Miettineninventor
Life of this patent
Estimating the term…
Abstract
The bridge is constructed of one inner tube and an outer tube surrounding the inner tube. The inner and outer tube are joined to each other by connecting pipes welded to the outer surface of the inner tube and to the inner surface of the outer tube so that the inner tube and the outer tube are connected to each other through said connecting pipes whereby a rigid composite structure is formed. The tubes and pipes are preferably laser welded to each other, preferably by a continuous seam.
Claims13
Method for manufacturing a bridge, comprising steps of
- providing a first tube having a first cross section and first dimensions of the cross section,
- providing at least one utility pipe, and
- providing a second tube having a larger cross section and dimensions as the first cross section and dimensions,
- welding the at least one utility pipe lengthwise on the outer surface of the first tube by laser from the inside of the first tube, and
- welding the second tube over the at least one utility pipe by laser from the outside of the second tube.
2 more elements
A bridge having essentially closed structure, comprising
- an inner tube having first cross section and dimensions of cross section,
- at least one outer tube having second cross section and dimensions and surrounding the inner tube, and
- at least one utility pipe,
- at least one of the tubes being formed of sheet metal and comprising a seam that joins at least two edges of the sheet metal,
- wherein
- the inner and outer tubes are joined to each other by the at least one utility pipe welded to the outer surface of the inner tube and to the inner surface of the outer tube so that the inner tube and the outer tube are connected to each other through said utility pipe whereby a rigid composite structure is formed.
3 more elements
Dependencies are inferred from the claim text.