US2764768A - Shoe lasts - Google Patents

Description

Oct; 2, 1956 J, w, ASHLEY TAL 2,764,768

SHOE LASTS 4 Sheets-Sheet 1 Invenzioni John W/shley,

SHOE LASTS 4 sheets-'sheet 2 Filed Oct. 26, 1951- Oct. 2, 1956. J. w. ASHLEY ETAL 2,764,768

' SHOE LAsTs Filed Oct. 26, 1951 l 4 Sheets-Sheet 3 56 69 66 In ve nms. '3` 30 John Ws-Lley Y 5442/ JamesE'LecLhy 4f4 y 26 /2 54 Il# mi z Oct. 2, 1956 l J. w. ASHLEY ETAL j 2,764,768

SHOE LAsTs Filed oct. 26, 1951 4 sheets-sheet 4 F 6 Ing/enfans' Jaarw/Ashley .ameSF-Leahy United SHOE LASTS Application October 26, 1951, Serial No. 253,308

3 Claims. (Cl. 12-133) This invention relates vto lasts adapted for use with hereinafter disclosed resin injecting apparatus in the attachment of heels to shoes, said apparatus being the subject-matter of a divisional application Serial No. 555,121 filed vDecember 23, 1955 in our names.

As explained in United States Letters Patent No.

2,600,507, granted June 17, 1952 on an application filed in our names, it has been proposed to attach a heel to a shoe by the use of thermoplastic resin which in its viscous form is injected into and lls undercut or anchoring cavities formed in the heel seat of the shoe and the attaching face of the heel as well as all voids existing between said attaching face and heel seat, said resin after it has set servingas a rivet for permanently securing the heel to the shoe.

Resin may be introduced into the anchoring cavities in' the attaching face of the heel and in the heel seat of ther rates Patent Patent No. 2,600,507.

viC@

attaching heels 20 to shoes 22 by the use of thermoplastic resin 24 in accordance with the method disclosed in said Instead, however, of injecting viscous resin through a passage extending heightwise through the heel as disclosed in said application, the resin is injected .through the heel seat portion of the shoe, a special form, support or last 26, which is hereinafter described and constitutes part of said apparatus, being provided for this purpose. The apparatus comprises the last 26 upon which the shoe 22 to which the heel 20 to be attached is clamped, a resin receiving spindle-nozzle 28 upon which the last is mounted andv to which the last is coupled, and an vextruder 30 (Figs. 1 and 2) `in which the resin is plasticized and whichy forces the resin into and throughthe spindle-nozzle. 1 The heel 20 has formed in its attaching face 32 (Fig. 7), a pair of cross slots 34 which are inclined to the plane of-the' rim 36 of the attaching face of the heel and may be collectively referred to as an undercut or anchoring cavity.

The shoe 22 comprises an insole 3S in the heel seat portion of which is formed a relatively large undulatory orv crenate opening 40, a ibre tuck 42'which is cemented or shoe throughA a passage extending heightwise through the'.

heel, as disclosed in Patent No. 2,600,507, or through a passage terminating in the breast of the'heel, as disclosed in United States Letters Patent No. 2,641,852, granted on June 16, 1953 in the names of Iames'F. Leahy and George F. C. Burke. It has also beenproposed permanently to attach heels to shoes by injecting the thermoplastic resin intothe above-mentionedjcavities .and voids through theV heel seat of the shoe and it is an object of the present invention'to provide a last which is adapted to. cooperate with the above-mentioned resin injecting apparatus for this purpose.

otherwise secured to the lower face of the heel seat portion of thetinsole and has formed in it a relatively small opening 44, an upper 46, a counter portion 46A of which consists of an outer layer of leather 48, a fiber counter 50 and a lining 52 all suitably sewed or otherwise secured together, heel seat lasted and secured to the heel seat portion of the insole and its tuck by tacks S4, a metal stiffener 56 which is secured at its forward end to the insole by staples' (not shown), and an outsole 53 which is adhesively 'secured to a roughened overlasted margin 60 The present invention consistsin the'novel features (Fig. 7) of the shoe upper and has its heel seat reduced or fitted to providey a heel seat tab 62 and heel breast receiving shoulders 64.

The insole 38 and the tuck 42 maybe referred to as a composite insole which provides the heel seat of the shoe being fully disclosed in thefollowing description and` in section, of the illustrative. last and the above-mentioned resin injecting apparatusv ready toibe' usedin. the vattach-tv mentpfja heelvtona shoe;

Fig. 2 is a view sim-ilarto the upper lpartv of Figi-1" but on a larger scale showing a1 valve head of the resinwith la cavity 43, said cavity being described as undercut by reason of the fact that the opening 44 in the tuck is considerably smaller than the opening 40 in the insole 38 so that marginal lobes 66 of the opening underlie the "tuck as lviewed in Fig. 7. The rear end of the shank injecting apparatus depressed to a cocked position in=which resin yunder pressure isjadmittedv to undercutcavities formed in the heel seatofythe shoe and inthev attachingff face of avheel to be attached to the-shoe; 1

Fig. 3` is a longitudinal central section through the Lheelr seat of a last and a shoeto which a heel has been4 attached Fig. 4 is a section on line IV-IV of Fig. l; 1.165

stiifener S6 extends into a void or space formed between the undercut cavities 34, 43 formed respectively in the attaching face 32 of the heel 20 and the heel seat of the shoe and viscous resin injected into the cavity 43, vby thel use .of apparatus hereinafter described, fills said cavities and voids and has secured in the rear end ofthe shank stiifener, thus providing a shoe having a rigidv heel seat portion to which the heel is effectively secured permanentlybya resin rivet 69. v

The heel v20 may be held in the proper position upon the fitted heel seat of the shoe by a clamp 70 (Fig. 2) comprising a C-s'haped bracket 72 carrying a universally tiltableledge 74 which engages the upper surface 76 of a back cone 78 of the last upon which the shoe is mountedv and a presser foot S0'which is universally connected be flush with the insole ofthe shoe;

Fig. 5a islan'enlarged fview on lluevae 5;;70

Fig. 6 is a wiringdiagranrof theapparatus; Fig. 7 is an exploded to a screw. 82 threaded'into said bracket and is forced, uponrotation of the screw, against the tread end4 of the heel 20to be attached to the shoe.v The clamps 70 are commonly 'referred .to asC-clamps'.- By` the use of ff lt- Cllulps heels ,are-temporarily secured in theirj proper positions upon the tted heel seats of the shoes Fatented Oct. 2, 1956;

3 preparatory tobeing permanently attached to the shoes.

.The last 26 is provided with a highly polished heel plate 84 and has passing through its back cone 78 a bushing or sleeve 86 (Figs. l, 2, 3, 5 and 5a) having a cylindrical spindle-nozzle receiving bore or passage 88. The bushing 86 has a heel seat face 90 which is flush with an adjacent portion of the outer or heel seat face 92 of the last plate 84 and has a cylindrical port, passage or bore 94 which extends from said heel seat face into the bore 88, a frusto conical sealing or spindlenozzle engaging shoulder 96 extending from the wall of the cylindrical port 94 to the wall of said bore 88. The heel seat face 92 of the last plate may be referred to as a shoe sustaining face or the heel seat of the last.

The bushing 86 has formed integral with it a ange 98 which overlies a wood portion of the back cone 7 8 of the last 26 and forms the upper surface of the back cone, a well portion 100 of the bushing 86 having an internal thread 102, the distance between said thread and the shoulder 96 being constant irrespective of the height of the last. Accordingly, it will be notedthat the depths of the well portions 100 of the bushings 86 of the lasts will vary, the Well portions of the bushings of low lasts being shallow as shown in Fig. 2, and the well portions of high lasts being relatively deep as shown in Fig. 3.

The spindle-nozzle 28 is generally cylindrical and is vertically disposed, the bushing 86 fitting slidingly down over the spindle-nozzle until the shoulder 96 of the bushing engages a complemental frusto-conical face 104 of the spindle-nozzle 28 which has a lcylindrical passage or port 106 which when the shoe is positioned on the spindlenozzlefregisters and is substantially continuous with the port 94 of the bushing 86 and has communicating with it a cylindrical resin receiving bore or passage 107. The spindle-nozzle 28 has a thread 108 which meshes or interlocks wit-h the thread 102 of the spindle-nozzle, the pitch of the threads being such that when the last has been turned approximately 90 from an initial rest position in which the thread 102 rests upon the thread 108, the frusto-conical shoulder 96 of the bushing 86 of the last 2,6 will be forced sealingly against the frusto-conic'al face 104 of the spindle-nozzle. The threads 102, 108 of the bushing 86 and the spindle-nozzle, respectively, may be-described as coupling, interlocking or threadedparts.

The extruder 38 is of the general ty e isclosed in United States Letters Patent No. 2,589,323, granted March 18, 1952, on application filed in our names and cornprises a plasticizing cham-ber 110 (Figs. l and 2) into which powdered resin is fed, and a screw conveyor 112 for feeding the resin into the chamber `and through an exit passage 114 of the extruder. Secured to the extruder by screws 116 is an extruder head 118 having an L.- shaped passage 120 which registers with and may be considered. part of the passage 114 of the extruder and secured by screws 122 to the extruder head 118 is the spindle-nozzle 28 the bore 107 of which registers' with the passage 120. The extruder 30 together with the spindle-nozzle 28 serves as an injector for the resin and collectively with said spindle-nozzle may be referred to as an iniector 124.

Slidingly mounted in the bore 107 of the spindlenozzle 28 is a slide or plunger 126 having a valve or valve head 128 (Figs. 3 and 5) which is complemental in cros's section to the port 94 an-d which has an upper end or face 130 which when said head is in a closed or rest position in the port is ush or in alinernent with the heel seat face 90 of the bushing 86. The slide-126 is constantly urged upward to its closed position by a heavy spring 132 (Figs, l, 2, and 4) opposed ends of which are attached to a hook 134 carried by the extruder head 30 and a screw 136 in a collar 138 secured to the slide. Secure-d by a screw 140 to the slide 126 is a collar 142 which limits upward movement of the slide and accordingly establishes the upper or closed position of the valve head 128, the arrangement, as above explained, being such that the upper end of the valve head is ush with the heel seat face 90 of the bushing 86 which in turn is flush with the face 92 of the heel plate 84 of the last 26 when the collar 142 is in engagement with a stop face 144 of the extruder head 118.

lt will be understood that the resin in the extruder head 118 and the spindle-nozzle 28 shall be brought up to the proper temperature before operating the apparatus and that such temperature shall be maintained during the operation of said apparatus. Accordingly the extruder head 118 has housed in it electrical heaters (not shown) similar to the electrical heaters 145 of the extruder 30. Moreover, when there is no work in the apparatus the spindle-nozzle 28, which may be described as a spindle having at an end portion thereof a nozzle, may be heated by a suitable shroud (not shown).

The lower portion of the slide 126 ts loosely in a bore 146 (Fig. l) formed in a treadle 148 (Figs. l and 6) the rear end of which is fulcrumed upon a pin 150 secured to a main frame 152 upon the upper end of which the extruder is mounted. The treadle 148 is constantly urged clocktwise as' viewed in Fig. l about the pin 150 by a spring 154, upward movement of the treadle being limited by the engagement of the treadle with the main frame and downward movement of the treadle being limited by the engagement of a screw 156, which is adjustably carried by the treadle, with the main frame. The treadle 148 also has adjustably mounted on it a screw 158 which, as will be hereinafter explained, operates a cross bar (Fig. 6) of a self-closing switch 162 in a circuit 164. Formed integral with the treadle 148 is an upstanding bracket upon which is pivotally mounted a fulcrum pin 172 secured to a latch 174 which is constantly urged clockwise as viewed in Fig. l by a spring 176 and has its lower end operatively connected to a slidable core 178 of a latch controlling solenoid 168 which comprises a coil 166.

When the treadle 148 is in its raised position the cross bar 160 of the switch 162 has been moved by the screw 158 out of contact with terminals 180 of the switch 162 and the coil 166 of the solenoid 168 is deenergized, the spring 176 holding an abutment face 182 of the latch in a position adjacent to the slide 126 and over a collar 184 secured to the slide.

In the attachment of heels 20 to shoes 22 by the use of the above apparatus the operator places the shoe mounted on the last 26 upon the spindle-nozzle 28 with the thread 102 of the bushing 86 of the last resting on the thread 108 of the spindle-nozzle and then rotates the shoe approximately 90 upon the spindle-nozzle, forcing the frusto conical surface 96 of the bushing against the frusto conical surface 104 of the spindle-nozzle 28 and locking the last against heightwise displacement upon the spindle-nozzle.

The treadle 148 is then depressed permitting the cross bar 160 of the self-closing switch 162 to bridge the terminals of the switch and causing, through the latchA 174, the plunger 126 to be depressed from its raised or closed position, in which it closes the passages 94, 106

of the last bushing 86 and the spindle-nozzle 28 respecv tively, to its lowered or open position thereby releasing any pressure remaining in the resin in the passage 120 at the end portion-of the preceding operation.

Power for operating a motor 186, to which the screw conveyor 112 is operatively connected, is supplied by a 3-phase circuit 188 to two wires of which is also connectedthe primary coil of a transformer 192 the secondary coil 193 of which supplies current for a relay 200.

When the apparatus is at rest and the treadle 148 has been depressed to open the passages 94, 106 as above stated, bars 204, 206 of a slide 208 which forms part of the relay 200 and is constantly urged to the left, as viewed in Fig. 6, by a spring 210, are in their open positions spaced from their associated terminals 194, 198 and a bar 212 of the slide bridges the terminals 196 one of which is in a line 214, a coil 216 of a solenoid 218 of said relay 200 at this time being deener-gized.

In order to start the motor 186 the operator presses a bar 220 of a switch 222 across terminals 224 of a line 226 thereby energizing the coil 216 of the solenoid 218 and accordingly moving the bars 204, 206, of the slide 208 across the terminals 194, 198 respectively and the bar 212 of the slide, away from the terminals 196. When this occurs a coil 228 of a relay 230 becomes energized causing bars 232, 234 of a slide 236 of the relay to bridge terminals 238, 240, respectively, and a holding circuit 241 to be established. During this time the coil 166 of the solenoid 168 remains deenergized since the terminals 196 are not bridged by the bar 212 and accordingly the latch 174 continues to bear against the collar 184 of the plunger 126 to hold said plunger depressed. As soon as the bar 220 of the normally open switch 222 has been moved to its bridging position across the terminals 224 a line 242 becomes a holding line for maintaining the coil 216 of the solenoid 218 energized and the motor in operation and the bar 220 may be released.

When resin in the passage 120 of the spindle-nozzle 28 has filled the undercut cavities 34, 43 in the heel 20 and the heel seat of the shoe 22 as well as any voids existing between the heel and said heel seat, resin pressure in the passage 120 increases to a point at which it deects outwardly a diaphragm 244 thus forcing a slide 246 to the left as viewed in Fig. 4 against the action of a spring 248 and accordingly moving a bar 250 (Fig. 6) of a normally closed switch 252 awayfrom terminals 254 in the holding line 242. When the holding line 242 is opened upon opening the normally closed switch 252 the coil 216 of the solenoid 218 becomes deenergized and the slide 208 moves under the action of the spring 210 to its position shown in Fig. 6, the bars 204, 206 being moved away from their associated terminals 194, 198 and the bar 212 again being moved across the terminals 196. When the bar 212 bridges the terminals 196, the coil 166 of the solenoid 168 becomes energized causing the latch 174 to be withdrawn from engagement with the collar 184 of the plunger 126 thereby permitting said plunger acted on by the spring 132 to be moved to its raised position.

The operator thereafter releases the treadle 148 thereby breaking the holding line 241 and deenergizing the coil 228 of the relay 230 thus permitting bars 232, 234 of the slide 236 to be moved away from their associated ter minals 238, 240 and accordingly deenergizing the coil 166 of the solenoid 168. As the treadle 148 is raised the latch 174 is retracted against the action of the spring 176 as it engages the collar 184 of the then raised plunger 126 and thereafter swings back to its starting position shown in Fig. 6 over the collar 184. After a short dwell the shoe 22 and the last 26 upon which the shoe is mounted are then rotated upon and raised with relation to the spindle-nozzle 28 to remove the shoe 22 to which the heel 20 has been attached from the machine.

At any time during the operation of the machine the operator may stop the motor 186 and accordingly the screw conveyor 112 and simultaneously therewith cause the plunger 126 to be moved to its raised position by actuating a normally closed switch 256 causing a bar 258 thereof to be moved away from terminals 260 in a line 261. After stopping the machine as above described it is necessary again to close the normally open switch 220 before the motor 186 can again be started.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

l. A last which is adapted for use in the attachment of a heel to a shoe by the injection through the last of plastic material into anchoring cavities formed in the heel and a heel seat of the shoe, comprising a bushing which extends heightwise through a back cone of the last from a heel seat thereof and which has a bore through which the plastic material is introduced into said anchoring cavities, said bushing having at a heel seat portion thereof a ilange extending partially across said bore and the upper end portion of said bushing having interlocking fastener means whereby the last may be positioned in sealing interlocking relation with a spindle-nozzle through which is supplied the plastic material introduced int-o said anchoring cavities.

2. A shoe support for use with a spindle-nozzle which has a coupling part and a passage for transmitting plastic resin, said shoe support comprising a heel seat portion, a bushing which is provided with a passage having lone end opening into said heel seat portion and which has a coupling part and a shoulder extending partially across its passage and arranged in close proximity to said heel seat portion, said coupling part of the bushing being adapted to cooperate with the coupling part of the spindlenozzle to force said shoulder into sealing engagement with the spindle-nozzle and t-o lock the support against movement lengthwise of said spindle-nozzle.

3. A last for use with a spindle which has at an end portion thereof a nozzle and has a passage for transmitting resin to the nozzle and which has an interlocking part, said last comprising a back cone having a heel seat face, and a bored bushing which extends heightwise through said back cone and has a port opening into said heel seat face and which has an interlocking part adapted to interlock with the interlocking part of the spindle for securing the last to the spindle with said port in sealing engagement with the nozzle of the spindle.

References Cited in the file of this patent UNITED STATES PATENTS 1,596,874 Gubitosi et al. Aug. 24, 1926 2,345,917 Coffman Apr. 4, 1944 2,447,512 Leahy Aug. 24, 1948 2,470,402 Jobst May 17, 1949 `2,494,494 Small Jan. 10, 1950

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