Abstract: A cruciform joint of glazing bars comprising a glazing bar extending between and perpendicular to an aligned pair of glazing bars. Each glazing bar has a central load bearing portion (16) which has a solid snapfit formation (22) at one end, interconnected to a solid end portion (23) by a hollow mid-portion (21). A base portion is interlocked with the solid end portion (23) and a clamping section is snap-fitted onto the snap-fit formation (22) so that a respective pane of glazing material can be clamped therebetween. The aligned pair of glazing bars are connected by a key (19) which is placed through a keyhole (18) in the intervening glazing bar and which extends into the hollow mid-portions (21) of each of the aligned pair. The keyhole (18) is formed solely through the hollow mid-portion (21) of the glazing bar, and the key (19) is inserted through the aperture (18) and then rotated and snap-fitted into a locked setting.

Abstract: An interlocked grid structure includes one glazing bar extending between and perpendicular to an aligned pair of shorter glazing bars which abut it. Each glazing bar comprises a T-section which is formed by a hollow metal extrusion and a plastics extrusion which are interlocked, and by a plastics cap which is formed by a double beading and which is snap-fitted onto a head portion of the metal extrusion which forms the stem of the T-section and which is load bearing. The plastics extrusion forms the base of the T and provides a seat for a pane of glazing material on either side of the stem. A locating metal plate is embedded in the adjacent ends of the shorter bars to which it is fixed and extends through a lateral aperture in the load bearing stem portion of the glazing bar to locate the shorter bars relative to the glazing bar.