Structural sheet metal bar member for use in heat insulating building parts

Claim 2

A sheet metal bar member for use as a distancekeeping, stiffening and load-supporting structural framing element in heat insulating building parts of the general class comprising two panels held together in spaced relationship by a framing and having the interspace between them at least partially filled with a heat insulating material, said bar member comprising a pair of flange portions paralleling and serving as attachments for said panels and an integral web between said flange portions, the plane of said web being substantially at right angles to the planes of the panels, said web portion being perforated by open slits extending in the longitudinal direction of said bar member, said slits being arranged in at least four laterally spaced longitudinal rows, the distance between adjacent ends of said slits in each said slit row being at most one half of the slit length, and said slits in adjacent rows being staggered and overlapping each other with a part of their length corresponding to at least the distance between the most adjacent edges of the slits in the two slit rows in question, wherein each of said slits is bordered at least along both its longitudinal sides by edge portions bent out approximately at right angle from the plane of the web portion and projecting to a height over the surrounding web surface corresponding to several times the sheet metal thickness, wherein first elongate through-like embossments are pressed out of the plane of the web portion to extend transversely between adjacent slit ends in each slit row, said first embossments being doubled between the slit ends in at least some of the slit rows and each having a sufficient length in the direction of width of the web portion to extend almost up to the adjacent slit row on either side of the slit row in question, and wherein second elongate trough-like embossments are pressed out of the plane of the web portion to extend at a slightly oblique angle to the longitudinal direction of the bar member between at least two of the slit rows of the web portion, whereby said web portion is stiffened with reduced thickness of the sheet metal needed for forming the bar member and heat transfer across said web between said flange is reduced.

Claim 3

A structural bar member as claimed in claim 1 wherein said first, transversely extending embossments are doubled between the slit ends in all the slit rows.

Claim 4

A structural bar member as claimed in claim 1 wherein said second, obliquely extending embossments are provided between all pairs of adjacent slit rows.

Claim 5

A structural bar member as claimed in claim 1 wherein the length of the slits corresponds to at least half the width and at most the entire width of the web portion.

Claim 6

A structural bar member as claimed in claim 1 wherein the open width of the slits is about eight times the sheet metal thickness.

Claim 7

A structural bar member as claimed in claim 1 wherein the ends of said second embossments merge into said first embossments to form with them continuous zigzaging embossment lines extending from the vicinity of one flange portion of the bar member to the vicinity of the other flange portion thereof generally across the slitted web portion.

Claim 8

A sheet metal bar member for use as a distancekeeping, stiffening and load-supporting structural framing element in heat insulating building parts of the general class comprising two panels held together in spaced relationship by a framing and having the interspace between them at least partially filled with a heat insulating material, said bar member comprising a pair of flange portions serving as attachments for the panels and between them an integral web portion that is perforated by a great number of open slits extending in the longitudinal direction of the bar member and arranged in at least four laterally spaced longitudinal rows, each slit having a length corresponding to at least half and at most the entire width of the web portion and having also an open width corresponding to about eight times the sheet metal thickness of the web portion, the distance between adjacent ends of the slits in each slit row being at most one third of the slit length, and the slits in adjacent rows being staggered and overlapping each other with a part of their length corresponding to at least the distance between the most adjacent edges of the slits in the two slit rows in question, each of said slits being bordered at least along both its longitudinal sides by edge portions bent out approximately at right angle from the plane of the web portion and projecting to a height over the surrounding surface of the web portion corresponding to at least twice the sheet metal thickness, first elongate trough-like embossments being pressed out of the plane of the web portion in the same direction as are said slit edge portions bent out, said first embossments extending transversely between adjacent slit ends in each slit row and having a sufficient length in the direction of width of the web portion to extend almost up to the adjacent slit row on either side of the slit row in question, second elongate trough-like embossments being pressed out of the plane of the web portion in the same direction as are said slit edge portions bent out, said second embossments extending at a slightly oblique angle to the longitudinal direction of the bar member between at least two of the slit rows of the web portion, the ends of said second embossments merging into said first embossments to form with them continuous zigzaging embossment lines extending from the vicinity of one flange portion of the bar member to the vicinity of the other flange portion thereof generally across the slitted web portion.

Claim 9

A sheet metal bar member for use as a distancekeeping, stiffening and load-supporting structural framing element in heat insulating building parts of the general class comprising two panels held together in spaced relationship by a framing and having the interspace between them at least partially filled with a heat insulating material, said bar member comprising a pair of flange portions serving as attachments for the panels and between them an integral web portion that is perforated by a great number of open slits extending in the longitudinal direction of the bar member and arranged in at least four laterally spaced longitudinal rows, each slit having a length corresponding to at least half and at most the entire width of the web portion and having also an open width corresponding to about eight times the sheet metal thickness of the web portion, the distance between adjacent ends of the slits in each slit row being at most one third of the slit length, and the slits in adjacent rows being staggered and overlapping each other with a part of their length corresponding to at least the distance between the most adjacent edges of the slits in the two slit rows in question, each of said slits being bordered at least along both its longitudinal sides by edge portions bent out approximately at right angle from the plane of the web portion and projecting to a height over the surrounding surface of the web portion corresponding to at least twice the sheet metal thickness, first elongate trough-like embossments being pressed out of the plane of the web portion in the same direction as are said slit edge portions bent out, said first embossments extending transversely between adjacent slit ends in each slit row and having a sufficient length in the direction of width of the web portion to extend almost up to the adjacent slit row on either side of the slit row in question, second elongate trough-like embossments being pressed out of the plane of the web portion in the same direction as are said slit edge portions bent out, said second embossments extending at a slightly oblique angle to the longitudinal direction of the bar member between at least two of the slit rows of the web portion, the ends of said second embossments merging into said first embossments to form with them continuous zigzaging embossment lines extending from the vicinity of one flange portion of the bar member to the vicinity of the other flange portion thereof generally across the slitted web portion.