Patent GB-103849-A (GB)
Title: Improvements in or relating to Sole-levelling Machines.
IPC: A43D89/00
Filed: 1916-02-09
Abstract: 103,849. British United Shoe Machinery Co., (United Shoe Machinery Co.). Feb. 9, 1916. Sole-levelling.-A jack for levelling- machines of the well-known Croodyear type, such as is described in Specifications 10883/95 and 8880/08, is constructed so that it will accommodate both shoes and long-legged boots of varying sizes and styles, and comprises a relatively long heel post 3, Fig. 1, fulcrumed at 4 to a correspondingly lengthened toe post 1, which is provided with an integral hub 5 loosely sleeved on a rock-shaft 6. The posts are adjustable towards one another by a rod 9, which is threaded at one end into a split nut 11 swivelled in an arm 12 projecting from the hub 5; the other end of the rod passes through a head 14 swivelled on an arm 15 integral with, but spaced away from, the heel post. The heel post is formed as a curved arm so arranged that, as it is moved towards the toe post, it is also moved upwardly to an extent which corresponds to the proportionate variation in the depth relatively to the length of the lasts. The toe of the shoe is supported on a cap 30, Figs. 1 and 3, connected by a spindle 31 and a pair of ears 32 to a toe rest 20, which is similarly detachably connected to a support 21; vertical adjustment of the rest is effected by means of a wedge 25, while adjustment for angularity of the last is effected by sliding the support 21 in curved ways 33 in the toe post 1 by means of a worm and gear segment 35, 36. The upper portion of the toe post is provided with an inclined face 39 to form a receiver for the levelling-roll in the usual manner. The heel o! the last is mounted on a pin 41, Fig. 1, carried by a block 40 which is supported by plates 44 recessed in the heel post. The block is adapted to be rocked against the action of a spring plunger 60 to clamp the shoe upon the jack, by a rod 46 geared to a shaft 47 journaled in the arm 15; the upper end of the shaft is squared to take a wrench. To hold the shoe firmly during the levelling operation, the jack is provided with a heel clamp which is supported upon a rod 65, Fig. 1, fulcrumed to an extension 67 of the heel post; the clamp is locked in operative position by a spring- pressed pawl 69, which engages a ratchet plate 70 fastened to an arm 71 bolted to the arm 15, and is adapted to be released, when required, by a finger-piece 75. The clamp comprises a suitably-faced back clamp 90 formed integral with a head 79, Figs. 1 and 5, and a pair of side clamps 91 pivotally supported upon toothed bellcranks 92 gearing with a worm 96 on a shaft 97, which is journaled in the head 79 and carries a hand-wheel 98. The head 79 is carried by a. standard 78, which is rotatably mounted in a support 80 and normally clamped by a bolt 81; when this bolt is released, the head 79 may be adjusted vertically by means of a knurled nut 84. In place of, or in conjunction with, the heel clamp, the jack may carry a shank pad or . stirrup 110, Fig. 8, each end of which is connected to the corresponding arm of an actuating- lever 112 by a tension spring 113 threaded upon studs 114, 115. The stud 115 is secured to a block 116 pivotally connected with a recessed head 117, which is in turn pivotally connected to a plate 119 secured to the strap 110; the stud 114 projects from an L-shaped head 122 connected to the lever 112. This lever is fulcrumed upon opposite sides of the toe post and has associated with it a locking-pin 128 and segment 125, the upper end of which is formed with a slot 133 to retain the lever in a raised position during the jacking of the shoe. To cause the strap to be automatically adjusted in accordance with the size adjustment of the jack, the arms of the lever 112 are pivoted upon blocks slidingly mounted in recessed slides 136, the recesses being curved about the pivot 4 as a centre. The strap exerts a direct pressure on the shank of the shoe and operates through a yielding form 138; it is also provided with an extension 139 to prevent the roll from engaging with any heel-seat nails. Specifications 24,664/07, 22,849/10, 14,497/11, 3319/12 and 6415/15, [Class 89 (iii), Nailing &c.], also are referred to.