GB1352023A - Footwear - Google Patents

Abstract

1352023 Boots &c RO-SEARCH Inc 29 April 1971 [4 May 1970 4 June 1970 6 Oct 1970 (2) 2 March 1971] 12255/71 Heading A3B [Also in Division B5] A method of making a shoe includes the steps of stitching a strip of material 3 and a lasting cord 4 to the bottom margin of an upper 1, string lasting the upper on a moulding last 2 and moulding an elastomeric sole 20 directly onto the upper 1, cord 4 and strip 3. When assembling the upper 1 on the last 2 the top edge of the upper 1 may be located by pins 42 or a shoulder 41 (Fig. 6) and during the string lasting the bottom edge and string 4 may be located by a movable projecting portion 7 (Fig. 1) in the last bottom or by ribs 18 (Fig. 2). The ribs 18 or projection 7 also prevent the upper 1 from being over tightened during the string lasting. The strip 3 is at least partially mouldable and may cover the top edge of the sole 20 as shown in Fig. 1 in the manner of a welt, the strip 3 being located during mouding by pins 21 projecting from the side moulds 8. The strip 3 may also cover part of the outer edge of the sole 20 as shown in Fig. 6, the free edge of the strip 3 being turned inwardly by a projection 28 on the side mould 8 so that it becomes embedded in the sole 20. Alternatively the strip 3 may be formed by an angular extrusion (Fig. 2) with a hollow 22, the strip 3 being sufficiently rigid to eliminate the side mould, the strip 3 being held by a shoulder 24 on the bottom mould 10. The mould side frame (Fig. 4) is divided longitudinally and is further divided into separate heel and/or toe segments movable in relation to the middle part by means of hinge pins 45. The side frame may also include a pressure pad 47 which forces the back seam of the upper closely against the last 2, the pressure pad 47 being urged inwardly by a cam surface 48 when the side frame is closed. The main part of the last 2 may be heated by a heating element 15 (Fig. 2) to heat set the upper I, the last sole plate 14 being insulated by an air gap 16. The moulding is preferably performed in a turret type injection moulding machine in which the last 2 is moved between a loading station and a moulding station. The side mould 8 (Fig. 6) is fixed to the last carrier 51 by posts 52 having setting and locking devices 53 so that the side mould 8 is placed against the upper 1 on the last 2 at the loading station. This allows the operator to visually inspect the position of the strip 3 in the side mould 8.