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Metal-flange-web-connection

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Metal flange web connection

Details

Inventors: Meyer, Leon J.;
Assignee:
Primary Examiner: Ridgill, Jr.; James L.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman

Plywood sheets are used to make structures such as beams, stress skin panels, boxes and tanks with the aid of special metal flanges which engage and form bonds with opposite faces of the plywood sheets along one or more edges of the sheets. The metal flanges define U-shaped grooves the sides of which become bonded to the faces of the plywood during assembly of the structures by serrations or other projections which press into the wood along the entire length of the grooves.

DETAILED DESCRIPTION What is claimed is: 1.
A metal connector member for use in constructing a plywood box beam or double walled plywood panel comprising an elongated metal member including two coextensive, spaced-apart parallel channel portions facing in the same direction and extending the length of said member, each of said channel portions defining a slot having parallel walls for engaging and clamping to the opposite faces of an edge portion of a plywood sheet, said walls having a large number of sharp projections extending inwardly for penetration into the plywood to thereby form a friction bond with both faces of the plywood along the length of said channel portion, the adjacent walls of the channel portions also defining a third channel portion which is parallel to and faces in a direction opposite the first two channel portions.
2.
A structural assembly in the form of a plywood box beam or double-walled plywood panel comprising two metal connector members as in claim 1 and two parallel spaced-apart plywood sheets each having two opposite edge portions received within one of the slots in each connector member and engaging the walls of the slots, the projections on the wall of each slot extending into the opposite faces of the plywood sheet and forming a bond which transfers stresses between the plywood slot and the connector member and which prevents relative movement between the sheet and the member.

Description:
This invention relates to plywood structures, their method of assembly and to special metal gripping or clamping members which are bonded along one or more edges of a plywood panel to provide strength and/or to connect the plywood edge to another plywood edge or to some other structure.
In particular the invention relates to plywood beams in which the web portions of the beams are plywood panels and in which the flange portions of the beams are the special metal clamping members.
Plywood is a board, panel or sheet made up of a plurality of layers or plies of wood veneer with adjacent plies laid with their grains extending crosswise to each other

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