Abstract: A thermal-insulation element for window and door frames, which has a main body adapted to be operatively interposed between an inner half and an outer half of the framework of the door or window frame. There is an abutment portion projecting in a transverse direction from the main body and adapted to receive a head portion of a weather strip coming into abutment against it. A magnetic material is operatively associated with the abutment portion and an axial stop is operatively associated with the magnetic material to prevent expansions/contractions of the magnetic means.

Abstract: It is described a process for manufacturing in crochet galloon machines, ribbons of synthetic fabric provided with flexible hooks for quick-closing devices of the tear type, which process comprises a previous step of knitting a ribbon in which successive sequences of loops are formed. The ribbon is then submitted to a heat treatment adapted to substantially stiffen said loops previously shaped in an angle-bent conformation. Then a cutting operation is carried out on the stiffened loops so as to obtain one hook from each of them.A crochet galloon machine is also provided for forming said ribbons of synthetic fabric, said machine comprising a plurality of shaping elements adapted to form successive sequences of loops with the weft threads, a heat-treatment unit for setting the geometric shape of the loops, and a cutting device intended for cutting off the stiffened loops so as to obtain one hook from each of them.

Abstract: The present invention provides a method of coating a tin article with a non-hexavelant trivcalent chromium oxide and/or hydoxide in which the tin article is contacted with a trivalent chromium protective coating composition having an acid pH of about 2.0 to 3.0 which is free of chromium complexing agents.

Abstract: A tube machining apparatus is described which comprises a support frame (2), an intermediate body (6) arranged to carry tools (7), a clamp (8) for locking at least one tube (4) at a predetermined processing or machining station (9), and at least one gripper (16) for acting by grasping on each tube. Gripper (16) and tools (7) are carried by the intermediate body (6) and movement means (17) is provided which is interposed between the intermediate body (6) and the support frame (2) and is capable of simultaneously moving both the gripper and the different tools between respective rest and work positions.

Abstract: A composite pipe comprising a corrugated external pipe and a smooth internal pipe possesses a socket which, at its bottom, adjoins the internal pipe and the external pipe by an expanded section. Subsequent to the expanded section, the socket comprises a smooth-walled and substantially single-walled section which is again followed by a composite pipe section having an internal pipe section and an external pipe section with at least two annular corrugation crests.