US2716431A - Method of making shoe lasts - Google Patents

Description

Aug. 30, 1955 H. G. CLAUSING METHOD OF MAKING SHOE LASTS 2 Sheets-Sheet 1 Filed April 9, 1953 INVENTOR. lienry 6. CIausz'rg Aug. 30, 1955 H. G. CLAUSING METHOD OF MAKING SHOE LAS'IS 2 SheetsSheet 2 Filed April 9, 1955 IN V EN TOR. l/exr 6. Claasz' By 7 '9 W A T rYs United States Patent METHOD OF MAKING snoE'LAs'Ts Henry. G. Clausing Portsmouth, Qhio, assignor' to Vulcan Corporation, Portsmouth, Ohio, a corporation of Ohio- Application April 9, 1953, serial No. 347,723

1 Claim. ((51. 144-309) This inventionisconcerned with the method ofmaking shoe lastsandis specifically directed to the manufacture of a type of shoe-last that is known in the trade'as a slip last. The general construction of a slip last-' is exemplified in Patent No. 2,622,253 of December 23, 1952. The main object of the invention is to provide a more efiicient method of making a slip shoe last and which provides a shoe last whose hinged fore and heel parts have perfectly aligned, intercommunicating hinge containing routs therein.

Another object oftheinvention-is to provide amethod In the accompanying drawings which are illustrative of I the various steps in my process:

Fig. 1 is a side elevation of a one-piece shoe last form with the usual hinge pin holes formed laterally therethrough.

Fig. 2 is a fragmental, side view, partly in section, of an apparatus for carrying out the rout forming step of my invention.

Fig. 3 is a front view of the apparatus shown in Fig. 2 on a somewhat reduced scale.

Fig. 4 is a longitudinal section through the routed and drilled, one-piece shoe last form.

Fig. 5 is an elevation of the finished last after it has been divided into a forepart and a heel part, and said parts provided with the usual hinge.

Fig. 6 is a section taken on line 6-6 of Fig. 5.

It is conventional practice in the art of making shoe lasts to turn the initial shoe last form from a singlepiece of wood and then provide said form with a plurality of spaced, transversely extending through-holes which are adapted to receive the usual pins for hinging the slip last parts. The last forms so drilled are then divided into a heel part and a forepart by passing a series of connected saw cuts transversely through the shoe last form from top to bottom thereof and in position to locate at least one of the hinge pin holes in each of the divided last parts. The series of cuts have taken many forms but the most generally accepted form comprises a pair of circular, offset cuts which are joined at their inner ends by a horizontal cut which forms a pair of cooperative shoulders for the hinged last parts when the last is in expanded or extended position. After the last parts were formed, suitable hinge receiving routs were then made in each of the said last parts, these operations requiring separate setting up of each last part in a suitable jig, with the ever present possibility that the separately formed routs would not be in perfect alignment after said parts had been connected by a suitable hinge in the finished last. This invention is particularly adapted to overcome the inefiiciencies of the aforesaid rout forming process and also iii) all)

Z ,7 1 6 ,43 l Fatented Aug. 30 13955I 2" secure positive alignment between the routs formed in the fore and heel. parts'of'a shoe last;

Referring to the. drawings which form apart of the specification and illustrate how the invention may be carried out the reference, numeral 10 in Fig. 1.represents' a one-piece shoe last-gformwhich has been turnedfrom a block of wood. Spaced, hinge pin receiving holes, 11' have also been made through the body of the last form 10 by clamping said'form in a suitable, jig and then drilling. theholes in predetermined positions by feeding wood drills laterally through the clamped form.

The next step in the manufacture of the shoe last is. to form a hinge receiving rout in the one-piece. shoe last form 10 that has been provided withthe said'pin holes. 11. This step is best' understood by referring to Figs. 2 and 3 of the drawings which illustratea suitable apparatus for carrying out the said routing; step. This routing, apparatusmay comprise a suitable jig 12 having a front wall 13 and opposed side walls 14 and 1'5. Asshown in Fig. 3 a dovetail way 16 is milled in the. wall 14 of theji'gfor receiving a slide 17 that is in turn pivotally mounted on a carriage 18 by means of a pin 19. threaded in thecarriage at 20; andfhavingv a. smooth cylindrical. portion-21 receivable in a smooth bore 22 in the slide 17. The jig-1'2" and the slide 17 can be secured in adjusted positions by a set screw 23 threaded in the body of the jig and bearing at its inner end againstthe inclined side. wall of theslid'e: Means are provided for adjusting the la'teraland' vertical positions'of the'carriage with respect" to a fixed, motor driven router chain 24, said means comprising a slideway 25 between the machine base 26 and a block 27 and a slideway 28 between said block 27 and a block 29, respectively. The latter block has milled thereon a slide 30 which is offset with and parallel to the router chain 24, said slide being engaged in a way 31 formed in the carriage 18.

A shoe last 10 is clamped in the jig 12 between a fixed pin hole engaging lug 32 and an axially movable clamp rod 33. The lug and the rod each have reduced, foreshortened ends 34 and 35, respectively, which when the rod is moved to, and held in its operative position engages opposite sides of a pin hole 11 in the last form to position said form in the jig; the shoulders on the lug and rod, formed by the reduced ends, being adapted to engage the face of the last and securely clamp and hold the last in position in the jig. The movement of a rod 36 is coordinated with the rod 33 by a cross member 37, the rod 36 being adapted to engage one side of another pin hole in the last to secure the last against rotation during the routing operation. The clamp is actuated and held in clamping condition by a manually operable lever indicated by the numeral 38, said lever being pivoted at its end to a fixed support 39 and adapted to pivotally engage the cross member 37 at a point intermediate its pivoted end and its handle portion 40.

With particular reference to Fig. 2 it will be noted that the shoe last 10 is clamped in the pivoted jig by apparatus such as that set forth heretofore and that the pivoted jig can be moved longitudinally toward and away from the cutter chain 24 by pushing and pulling the carriage along the slide 30 with the aid of a handle 41 attached to the carriage body. Thus when the last is held in the jig in the angular position shown in full lines in said Fig.

2 and the jig carriage moved longitudinally toward the working end 42 of the chain cutter, the said end is entered into the upper end of the last form between the cone 43 and the jack mount 44 of the last; a rout portion 45, the width of the chain cutter being made into and beyond the vertical center line of the last. After withdrawal of the cutter from the last, accomplished by sliding the jig away from the cutter, the jig and the last clamped therein are tilted to the position shown by the 3 dotted lines 46 in Fig. 2, whereupon the carriage is again slid longitudinally toward the cutter where again the cutter enters the upper end of the last between the cone and jack mount to form the opposite portion 47 of the rout also having the width of the router chain. The finish, connecting cut is then made in the last by backing the carriage away from the cutter about A" from the position shown by the dotted lines 46 and then rotating the jig in the direction of the first rout 46 untii the triangular portion 48 between the two cuts is cleared out to provide a single, hinge link receiving rout 49 (Fig. 4).

The next step in my process is to divide the drilled and routed last into a forepart 50 and a heel part 51 (Fig. 5 This is accomplished by passing two oifset and circular saw cuts 52 and 53 laterally through the said last and connecting the inner ends by a narrow cut 54 which forms a pair of shoulders on each of the parts to establish the expanded or extended last positions of the parts. The dividing saw cuts are passed through the last in positions such that a portion of the rout 49 will be contained in each of the divided parts, and that each part so divided will have at least one hinge pinhole 11 therein.

After the last has been divided in the manner specified a suitable hinge is fitted therein so that the last parts may be connacted for relative swinging movements to secure ready insertion and withdrawal of the last from a shoe upper in the shoe manufacturing process. The hinge in this instance is a link 55 positioned within the rout and extending into both the forepart 50 and the heel part 51 where the ends thereof are pivoted to said parts by hinge pins 56 and 57, respectively, which are anchored in the through-holes 11. A latch plate 58-is anchored in the rout portion of the heel part, whilst a spring pressed latch lever 59 is pivotally mounted on the pin 56 for movement in the rout portion of the forepart; the lever and plate having a latching connection at their upper ends to hold the last parts in expanded condition. Release of the lever from the upper end of the plate permits the heel part to rotate relatively to the forepart on the link 55 thus collapsing the last for ready entrance into or removal of the last from a shoe upper.

What is claimed is:

A succession of steps in the hereindescribed method of making a shoe last comprising first turning a one-piece shoe last form from a single piece of stock, second, drilling a plurality of hinge pin receiving holes in the resultant shoe last form, third, making a single hinge link receiving rout in that one-piece shoe last form by entering a suitable router into the form through the upper end thereof at a point between the cone and the jack mount of the last form, fourth, dividing the routed and onepiece drilled shoe last form into a forepart and a heel part by passing a saw cut through said form in a position such that a portion of the rout and at least one of the pin holes will be contained in each of the last parts formed by the cut, and finally providing the said parts with a last hinge.

References Cited in the file of this patent UNITED STATES PATENTS 639,542 Eastman Dec. 19, 1899 648,525 Prindle May 1, 1900 1,588,703 Clausing June 15, 1926 1,979,193 Dexter Oct. 30, 1934 2,214,837 Madigan Sept. 17, 1940 2,336,049 Topham Dec. 7, 1943

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