GB394564A - Improvements in or relating to the manufacture of rubber footwear - Google Patents

Abstract

394,564. Rubber boots &c. BATA AKCIOVA SPOLECNOST, Zlin, Czecho- Slovakia. Nov. 5, 1932, No. 31271. Convention date, April 22. [Class 70.] A device for vulcanizing rubber soles to the uppers comprises a supporting plate and clamping members which are pressed upwards from the plate by a spring or equivalent means so that when they are clamped together thev come into contact with the rubber sole from above and ensure correct clamping of the upper. As shown in the drawings, a sole plate 3 is fixed to a supporting plate 1. Two sideheads or jaws 5, 6 provided on the supporting plate 1 are hinged at 8 and clamped at the opposite end. Plates 15 having decorative notches 19 are fastened to the members 5, 6. A bushing 17 of low heat conductivity is secured to each plate 15, and at foot and heel ends plates 16 are secured to the bushings 17. The side heads are pressed upwardly by springs 20 moving in cases 22a and held in place by stoppers 21 and studs 22. A rubber sole 23 is placed on the plate 3 and then an upper 34 mounted on a last is placed over it. The side-heads 5, 6 are brought together by the handles 9, 10 and secured by a lever 13 which turns about the handle 9 and has a slot which engages with the handle 10. The position of the clamped side-heads is ensured by a stud 11 engaging with an opening 12. The upper is pressed down upon the sole by pressure applied to the last. The side-heads are pressed down against the action of the springs 20 by the upper 34 which engages the inner margins of the plates 15, 16. The whole device is placed on a hot plate until the rubber has been vulcanized and the sole firmly secured to the upper. At the end of the treatment lever 13 is lifted away from handle 10 and the sideheads are forced apart by operation of a lever 36 which is fitted on the stud 37. The other end of lever 36 is tapered so that it may subsequently be used for removing the sole from the plate 3.