Patent GB-189920787-A (GB)
Title: Improvements in Machines for Lasting or Stretching the Uppers of Boots and Shoes.
Inventor: SEAVER AUGUSTUS
Filed: 1899-10-17
Granted: 1899-12-02
Abstract: 20,787. Lake, H. H., [Seaver, A.]. Oct. 17. Lasting.-The jacking and stretching mechanisms of lasting-machines are carried by a bracket c mounted on a shaft b, which can be rotated in the standard a to invert the last. The shaft is counterweighted at b<7>, and is locked in the required position by a pawl, controlled by a treadle b<6>, engaging one of two notches in a collar b<3>. The last is supported on rests c<1>, c<2>, and is secured by a rod d which is depressed against a spring by a lever d<6> actuated by a treadle d<9>. This rod has ratchetteeth on one side engaged by a pawl on the spindle d' to lock it in the depressed position. The gripping-appliances are carried by rods k<1> projecting from the bracket c, and can be moved along these rods to suit boots of various sizes by means of screws k<2>. Each consists of jaws g, g', Fig. 5, the one g<1> being moved with regard to the other by means of toggle-levers actuated by a rod g<5>. The two rods g<5> are hinged to a crosshead g<8>, Fig. 1, carried by a rod g<9> which is depressed, to cause the grippers to seize the upper, by means of a pinion gearing with teeth on the rod.. This pinion is mounted on a spindle carrying a pulley g<17> which is rotated by a chain attached to a rod g<19>. The end of this rod is bent to engage with a piece h on a chain actuated by a treadle h<2>. The jaw g is movable in the end of a lever i pivoted to a block j which can be moved by the means shown on a rod j<1> projecting from a piece j<10>. This piece can be rotated in the block k, which can be moved along the rod k<1> as described above. A spring pawl engaging a toothed arm j<7> holds the lever i in any desired direction, and is pressed upwards by a spring i<2> against an adjustable stop i<3>. After a last and upper have been placed on the heel and toe rests, the treadle d<9> is depressed to secure the last by means of the rod d. The upper is then placed between the jaws g and g<1>, and the treadle h<3> is depressed (1) to close the jaws and (2) to depress them and stretch the upper. By rotating the hand-wheels k<4>, the upper is drawn forwards over the last, this operation being facilitated by pincers m connected in the manner shown to the toe rest. Other gripping-appliances may be used at the waist or shank. The pawl b<4> is now withdrawn, and the shaft b rotated to invert the last. The levers i<6>, Fig. 5, are then swung outwards to push the jaws inwards and stretch the upper over the last and insole in a position to be tacked. The last is again brought into the position shown in Fig. 1, during which movement cams on the framing f co-act with levers d<10> and g<25> to release the pawls locking the jack-rod d and the gripping- jaws. Fig. 7 shows the construction of the toe rest, which is secured to the blocks k, k and has at its centre a sleeve c<6>. In this is mounted a slide having a spike to engage the last or insole. When the blocks k, k are drawn outwards to stretch the upper, the sleeve moves along the slide against a spring.