Patent GB-446527-A (GB)
Title: Improvements in lasting footwear
IPC: A43D21/12
Filed: 1934-10-31
Abstract: 446,527. Boot-making machines. BROOKES, N. E., 1, Quality Court, Chancery Lane, London.-(Kamborian, J. S. ; 41, Cross Street, West Newton, Massachusetts, U.S.A.) Oct. 31, 1934, No. 31238. [Classes 17 (i) and 17 (ii)] Lasting.-In lasting the side portions of an upper, over the edge of an insole, side clamping means are provided engaging the upper at the side of the last to prevent the shoe opening being distorted by shift of the top edge of the upper. Preferably, the clamp provides lateral pressure advancing progressively towards the last bottom while the upper is being stretched. The shoe support comprises a last pin 13<a> vertically adjustable in a slide adjustable for length of shoe by a hand wheel 12. A support 115 engages the instep portion of the last and is secured to a piston sliding in a fixed cylinder 113 to which fluid pressure is supplied. Each side clamp comprises a rubber bag 49 protected by a cover 57 secured to a carrier plate 48 supported by a socket engaging a ball 45 adjustable on a carriage 17. The two carriages are simultaneously slid inwardly or outwardly by rack bars and a pinion 21 actuated by a rack 25 gearing with a segment 28 oscillated by a rod 32 connected to a treadle 38 provided with looking means for holding it in the position to which it has been depressed. The bag is divided by septums pierced by small openings, so that fluid supplied to the lowest compartment shall first distend that before passing to those above. The fluid is supplied from a cylinder having a piston 61 normally urged outwardly by a spring but actuated by links and levers and a treadle 74 also provided with means for holding it in depressed position. The side wipers comprise a plurality of blades 95 each having a downturned outer end engaging a groove in a member 91 secured to a carriage 86 guided to slide in a path inclined downwardly towards the shoe, and moved to or from the work by a handle 89. The outer end of each blade is held down by a spring 99 engaging the member 91, and a second spring 109 connects the blade and the carriage. The operative end of the blade is upturned and, normally, rests on a member 101 heated by an electric resistance 105. A guide 59 for the wipers is secured to the plate 48. The shoe supporting bracket 9 is pivoted at 8 and maintained in normal position by a spring 10. When the wipers have been fully advanced the shoe is elevated by the support 115, to press the upper margin hard against the wipers, fluid pressure being supplied to the cylinder 113 from a cylinder 118, a piston in which is operated by a treadle 131 provided with means for holding it in the position to which it has been depressed. The fluid system, preferably, contains oil, and a reservoir 80 is provided, with a piston which can be depressed by a hand wheel 82 for compensating for leakage. In operation, an insole and upper are assembled on a last and this jacked. The operator then depresses the treadle 38 which causes the bags 49 to contact with the shoe, and seizes the margin of the upper by lasting pincers and draws the upper snugly about the last in well-known manner, the treadle 74 being depressed to inflate the bags before any substantial pull is exerted. The surfaces to be secured are then coated with adhesive and the handle 89 operated to wipe the upper margin over. Preferably, the inner side of the shoe is first lasted, and then the outer side. Finallv the treadle 131 is depressed to press the margin firmly against the wipers, and the work is left for the adhesive to set. Two sets of apparatus may be provided, side by side, one for a left shoe and the other for the right shoe of the pair.