Screw/clamp plate apparatus for securing insulation

Details Screw/clamp plate apparatus for securing insulation Screw/clamp plate apparatus for securing insulation

F - Mech Eng,Light,Heat,Weapons

16

B

85/110, 20/20.2

F16B 35/04 (2006.01)

Patent

CA 1249142

SCREW/CLAMP PLATE APPARATUS FOR SECURING INSULATION ABSTRACT OF THE DISCLOSURE Apparatus for fixing a waterproof membrane (6) and an insulation material (4) to a steel sheet (2)consists of a clamp plate(8) and a screw (10). The screw (10)(Figure 2) comprises a head (11), a shank, and a drilling tip (14). The head (11) has a clamping face (12)which tapers towards the shank, and which has external angles (30)in cross section. The shank has, in succession from the head (11) to the drilling tip (14) a first portion (16)which is unthreaded, a second portion (18)which is threaded, and a third portion(22)which is threaded. The diameter of the first portion (16) is approximately the root diameter of the second portion(18) and the crest diameter of the second portion (18)substantially exceeds the crest diameter of the third portion (22). The clamp plate (8) (Figure 4) is formed from sheet metal and has a central hole (24). The periphery of the clamp plate (8)is of elongate symmetrical shape having a minor dimension which is several times the diameter of the hole (24) and a major dimension substantially greater than the minor dimension. The clamp plate is generally flat with a countersink (28) around the hole (24) and with two endless gutter-like deformations (34), (36) the first one (34) adjacent the periphery, and the second one (36) approximately midway between the hole (24)and the first one (34).

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