Tongue and groove boards with spacers permitting expansion,...

Details Tongue and groove boards with spacers permitting expansion,... Tongue and groove boards with spacers permitting expansion,...

E - Fixed Constructions

04

C

144/74, 20/93

E04C 2/30 (2006.01) B27F 1/02 (2006.01) E04F 13/10 (2006.01)

Patent

CA 1131873

ABSTRACT OF THE DISCLOSURE. Tongue and groove boards are provided with integral spacers that permit expansion of the assembled boards without buckling, by milling on the bottom of the groove a central longi- tudinally extending rib of triangular cross section. Spaced por- tions of the rib, of total length that is most of the length of the board, are then compressed to the level of the bottom of the groove, thereby leaving a series of relatively weak projections which serve to space the boards apart the necessary distance during assembly, but which are not strong enough to resist compres- sion upon expansion of the boards under the influence of moisture or temperature.

350398

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