Patent GB-421586-A (GB)
Title: Improvements in or relating to the securing or attaching of parts in shoe-making
IPC: A43D86/00
Filed: 1933-06-23
Abstract: 421,586. Screwing-up nuts and screws. UNITED SHOE MACHINERY CORPORATION, 140, Federal Street, Boston, U.S.A.- (Assignees of Hardy, J. F. ; Beverley, Massachusetts, U.S.A.) June 23, 1933, No. 17906. Convention date, June 25, 1932. [Class 83 (iii)] Apparatus for attaching heel parts to shoes on their lasts comprises a clamp for engaging the top of the last to hold the shoe tread against a support and a work positioning member adapted to be moved against the heel end of the work, as the clamp is applied, in order to position the heel lengthwise of the shoe on the support. Work-holders.-As applied to a machine for temporarily attaching a heel to a shoe by means of a screw, as described in Specification 186,376, [Class 83 (iii)], the base plate 16, Fig. 2, on which the shoe 17 is supported is pivoted at 30 on a bracket 28 mounted by means of a stem 32 and screw 34 on the table 10 of the machine. The plate 16 is adjusted about the pivot 30 by a wedge 48 which is moved by a ball-ended lever 40 on a shaft 38 operated by a handle 44, Figs. 1 and 2. A support 54 for the heel 19 is adjustable by a slot and screw 60 on a bracket 62 slidable on the plate 16, which is connected by a link 70 to the lever 40 so that the support is adjusted simultaneously with the plate to suit the particular type of heel which is being attached. A second support 66 for low heels is also adjustable by a screw 68 on the bracket 62 and the latter may be turned end for end about a pin 64 to enable either support to be used. The last is engaged, to clamp the shoe on the plate, by a serrated bar 18 carried by curved levers 72 pivoted at 76 to links 78 pivoted to a bracket 80, on the table 10. The lower straight ends of the levers 72 are pivoted to links 82, Fig. 1, hinged at 86 to a bracket 88 depending from the table 10. The links 82 are longer than the links 78, so that as the levers 72 are raised to release the work, they are also moved rearwardly to enable the operator to have access for changing the work. A screw 90 on the levers 82 engages a stop 92 on the bracket 88 to limit the upward movement of the levers 72. The links 82 are connected to a treadle 94 by a spring 96 which is attached to a block 100 having a vertical slot engaging a pin 102 on the treadle, the tension of the spring being adjusted by a screw 104. A link 106 is also attached to the links 82 and has a slotted lower end receiving the pin 102. To clamp the work, the treadle 94 is depressed, thereby drawing down the links 82 through the spring 96. When the required pressure has been attained, the treadle may be held depressed by the operator or may bo locked by actuating a second treadle 108 carrying a pawl pivoted to the treadle 94 and engaging a fixed rack 112. On completion of a screwing operation, the treadle 108 is released and the spring 96 lifts the treadle 94 until the pin 102 meets the end of the slot in the link 106, whereupon a spring 114 attached to the treadle 108 raises the entire linkage to move the clamp 18 away from the work. For positioning the plate 16 according to the height of heel which is to be used, a heel is placed on a bracket 122, Fig. 2, attached to the plate at one side thereof and the plate is then adjusted about its pivot 30 until the top of the heel engages a stationary gauge attached to the bracket 28. Screwing-up machines.-The screwing-up head comprises concentric spindles 168, 218, Fig. 4, the former carrying a wrench 138 for engaging a lock nut 132 and the latter a screw-driver 136 for engaging the head 130 of the screw 26. An electric motor 22, Fig. 1, drives a universal joint 140 connected by a telescopic shaft 142 to a universal joint 150 attached to a disc 244. A casing 182 on the disc 244 has pivoted thereto two sets of ratchets 174, 230 pressed by springs 194, 235 so as to engage respectively with teeth on the hollow spindle 168 and the inner spindle 218. The springs 194 abut against levers 198, Fig. 6, pivoted to the casing 182 at 204 and having cam surfaces 208 which lie against pins 212 attached to a disc 214, Fig. 4, so that the compression of the springs 194 may be adjusted by rotation of the disc to set the ratchets to slip at the desired load. Similar levers pivoted on the pins 204 form abutments for the springs 235 and are acted upon by pins secured to the disc 244. The discs are secured in the adjusted positions by screws 204, 246 respectively. The pitch of the threads on the screw 26 which receive the nut 132 is smaller than the pitch of the threads by which the screw is attached to the heel and the compression of the springs 194 is arranged to be lower than that of the springs 235 so that the screw will first be driven home in the heel, the screw driver 218 then coming to rest, and then the nut 132 will be screwed lightly down onto the last, a spring 224 allowing the spindle 218 to recede axially as the nut travels down the screw. Balancing parts, applications of mechanism for.-The screwing-up head is balanced by a spring 164, Fig, 1, attached to a lever 160 pivoted at 162 to a pillar 12 on the machine. The other end of the lever is pivoted to arms 158, Fig. 4, on a member 156 which is pivoted to a stationary casing 152 having a lower portion 154 forming a handle for manipulating the head. The member 156 also forms a guard for the rotating telescopic shaft 142.