US2214837A - Method of drilling hinge pin holes in shoe lasts - Google Patents

Description

Sept 1' 1940. J. M. MADIGAN METHOD OF DRILLING HINGE PIN HOLES IN SHOE LASTS Filed Oct. 21, 19;? 3 t -Sheet l igl n o H fl w/ e g v mMM M] UM In 0 b &

Sept. 17, 1 940. J,M M D N 2,214,837

METHOD OF DRILLING HINGE PIN HoLris IN SHOEILAS'IS 3 Sheets-Sheet 2 Filed Oct. 21. 1937 lnven'for.

\John I LMudigun WMzW ATTys.

Sept. 17, 1940.

J. M. MADIGAN METHOD OF DRILLING HINGE PIN HOLES IN SHOE LAS'I'S 3 Sheets-Sheet 3 Filed Oct. 21. 1931 -M. Luflili Q r lnvenTof:

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1 i QR mm Patented Sept. 17, 1940 PATENT OFFICE METHOD OF DRILLING HINGE PIN HOLES 1N SHOE LASTS mm M. Madigan, Haverhill, Mass.

Application October 21, 1937, Serial No. 170,209

1 Claim.

This invention relates to methods and apparatus for drilling parallel hinge pin holes for twopart lasts.

In usual last constructions the pin holes for the hinge pins are bored from one side of the last entirely through to the other side. In performing such drilling operations some times a single drill is used and in others two or more drills are employed, the last usually being positioned by hand relatively to the drill or drills or adjustably positioned by hand in a jig. The object of the present invention is to eliminate all guess work of free-hand positioning of the last to be bored, second to prevent diversion of the drill from its proper path by uneven resistance to penetration of the drill caused by different conditions inherent in the wood of the last, such as differences in the grain of the wood, as for example, where a portion of the last to be drilled is of a plain grain maple, while other portions are of the so-called curly maple which is much more dimcult of penetration with the grain so running as to tend to divert the direction of the drill.

In the usual drilling of lasts one or both of the hinge pin holes is frequently diverted from its proper position so that it is in angular relation to the other. Under such circumstances when the last is cut into two sections and the hinge introduced there will be a binding at one side of the cut and a separation at the other side, thereby distorting the last and also interfering with the proper manipulation of the last.

One of the objects of the present invention is to obviate this defect in last manufacture and to insure perfect registration when assemblin the fore part to the heel part of the last by insertion of the connecting mechanism.

The present invention comprises novel steps in the method of making two-part lasts which will insure proper parallelism of the hinge pins.

One of the steps in the method comprises drilling coaxially alined holes for the respective hinge pins from predetermined points on opposite sides of the last, thereby insuringaccuracy of parallelism of the hinge pins when the parts of the last are assembled and secured together by suitable hinges. v

Another step in the method consists in terminating the axially alined bores for the hinge pins short of communication with each other and removing the web of material between the adjacent ends of the bore by routing out the recess which receives the hinge.

The method also comprises simultaneously drilling portions of both hinge pin bores from opposite sides of the last in such manner that the opposite axially alined bores will be simultaneously produced, thereby enabling a more rapid manufacture of the device than has heretofore been accomplished.

By thus applying the pressure of the boring mechanisms simultaneously to both sides of the last the likelihood of displacement of the last from its support, which is inherent in boring the last from one side, is eliminated. Furthermore, by the present method the depth to.which each drill must penetrate is considerably shorter than when the last is drilled clear through so that there is less likelihood of flexure of the drill particularly if it encounters relatively harder portions of the wood.

While the steps of the method of the present invention may be performed manually with usual last-clamping and drilling mechanisms, desirably the method is performed by a suitable machine illustrative types of which are shown in the accompanying drawings, in which,

Fig. 1 is a plan view of a last-boring machine illustrating the manner in which the hinge pin holes are bored in the last;

Fig. 2 is a detail side elevation of the portion of the machine which supports the last in proper adjustment to templets for simultaneously guiding the pairs of drills for boring the hinge pin holes;

Fig. 3 is a vertical transverse sectional view on lines 3-3 Fig. 2;

Fig. 4 is a vertical transverse sectional view on lines 4-4 Fig. 2;

Fig. 5 is a detail transverse sectional view on the broken line 5-5 Fig. 2;

Fig. 6 is a side elevation of a modified form of construction for clamping the last and for guiding the drills properly to produce axially alined hinge pin holes;

Fig. 7 is a vertical transverse sectional view on lines 1'| Fig. 6; and,

Fig. 8 is a detail plan view of the adjustable mechanism shown in Fig. 6 for supporting and clamping the toe portion of the last in proper position for boring the parallel holes for the two parallel drills of one drilling mechanism in axial alinement with complementary drills of the other drilling mechanism.

The drilling mechanism is conventionally shown and is of course mounted upon a suitable bed plate. Any suitable drilling mechanism may be employed. As conventionally illustrated herein the drilling mechanism comprises two casings I and 2 which are suitably mounted upon a bed plate (not shown) and containing suitable mechanism for driving and feeding pairs of drills 3 and 4 and 5 and 6 respectively. Suitable shafts I and 9 for actuating the driving mechanism may be driven by an electric motor or from any other usual source of power.

The mechanism for supporting the last as illustrated in Figs. 1 to 5 inclusive comprises a base 9, preferably of rectangularform, having integral therewith or secured thereto intermediate of its ends similar vertical templets III and I I provided respectively with pairs of holes I2 and I3 adapted respectively to guide the pair of drills 3 and 4 and the pair of drills 5 and 8 in such manner as accurately to aline the drill 3 with the complementary drill 5 and the drill 4 with the complementary drill 6.

Suitable means are provided for supporting and clamping the last in such position as to permit the drilling of the hinge pin holes in proper rela tion to the lines upon which the last is to be severed to provide a two-part hinge last. The last I 4, which usually is made of maple wood, and may be of any suitable configuration and size, is bored to provide the hinge pin holes before the last is cut to permit pivotal movement between the heel and toe portion. The heel portion of the last is provided with the usual socket containing a thimble I5 to receive the jack pin of the lasting machine.

In the construction, as shown in Figs. 1, 2, and

3, the heel portion of the last is supported upon an adjustable pin I6 which fits within the thimble I5 and is pivoted at its lower end upon a pin H which is mounted in bosses I8 and I9 extending upwardly from the plate 29 which is desirably countersunk into the base 9 and secured thereto by suitable machine screws. The boss I9 preferably extends upwardly a considerable distance above the base and in engagement with the, pin I6 and is provided adjacent its upper end with an arcuate slot 2| concentric with the axis of the pin H. A stud 22, which is fixedly secured to the pin I6, extends through the slot and is provided with a screwed end portion which is engaged by a milled nut 23 adapted when tightened up adjustably to clamp the pin I6 firmly against the boss I9. By reason of this construction longitudinal adjustment of the heel portionof the last is permitted properly to position the last relatively to the drills for boring the hinge holes in the last.

Means for supporting the toe portion of the last preferably include a supporting member of flat sheet steel having end portions 24 and 25 welded or otherwise secured to the inner face of the templets I0 and II and having a central downwardly extending V-shaped portion 26 which is provided with a removable resilient lining 21 of rubber, or other suitable material, which is adapted to be replaced for different sizes and contours of the arch portion of the last.

Suitable means are provided for adjustably supporting the toe portion of the last operable in conjunction with the heel support above described to position the last accurately relatively to the axes of the drills. In the preferred construction illustrated a vertical cylindrical stand 28 is rigidly mounted in the base 9 and receives the cylindrical lower end of a rod 29, which has an upper screw threaded portion. The upper end of the rod is provided with an enlarged head 30 to engage and support the toe portion of the last. The cylindrical stand 28 is provided with a vertical slot which forms a guide for a pin 3I which is mounted in the cylindrical rod 29 and prevents rotation of the rod. A knurled nut 32, which engages the screw threaded portion of the rod 29 and is seated upon the upper end of the cylindrical stand 28, provides means for adjustably raising and lowering the rod and the head thereof which supports the toe portion of the shoe.

Suitable means are provided for clamping the sides of the toe portion of the last: As illustrated in Figs. 2 and 5 the cylindrical stand 28 is provided with a rearwardly extending boss 33 having a vertical slot 34 in which is seated the cylindrical portion 35 of a rod having screw threaded portions 36 and 31 of opposite pitch and provided with a suitable knurled head 38 for conveniently rotating it. Clamping jaws 39 and 40 to engage the side portions of the last are provided with offset lower end portions which engage respectively the screw threads 36 and 31 of the rod 35. The lower ends of the clamping members desirably are flat and engage the upper face of the base 9. When the toe portion of the last has been properly positioned by adjustment of the supporting rod 29, the rod 35 may be rotated by its knurled head 38 firmly to clamp the jaws 39 and 40 against the sides of the last.

In order to aid in positioning the last properly and to prevent possible longitudinal movement thereof during the drilling operation, an abutting member is provided to engage the rear end of the heel portion of the last. In the construction illustrated in Figs. 1 and 2 the abutting member is in the form of a casting having a vertical stand 4| having a rearwardly curved upper end and a reenforcing web 42 which is formed integral with a slide 43 which is mounted in suitable ways 44 in the base 9 and is normally forced toward the heel by springs 45 interposed between the slide and a plate 46 which is welded to or otherwise secured to the end of the base.

In the operation of the machine above described the heel portion of the last is placed upon the pin I6 and forced downwardly until the upper end of the pin engages the base of the thimble l5. As it is thus forced downwardly the abutting member 4| is forced rearwardly against the pressure of the springs 45 and the arch portion .of the last caused to engage the resilient lining 21 of the arch-supporting member, it being understood that the resilient member 2'! is detachable so that suitable shapes may be provided for lasts of different sizes and of diiferent contour. The last is then adjusted longitudinally properly to position it with respect to the drills and locked in adjusted position by setting up the nut 23 which clamps the pin upon the boss I9. The toe portion of the last is then positioned by vertical adjustment of the supporting rod 29 and head 30 to position the last vertically relatively to the axes of the complementary drills. The knurled head 38 of the rod 35 is then rotated to cause the clamping jaws 39 and 40 firmly to engage the sides of the toe portion of the last. When the last is thus properly positioned with respect to the guides I2 and I3 of the respective templets, the drills are actuated to bore the hinge pin holes simultaneously from both sides of the last, thereby subjecting the last to equal pressure upon both sides which will prevent the like-' moved from the clamping support and the toe v and heel portion severed by sawing a cut 48 substantially vertically from the arch portion of the sole of the last a predetermined distance, then by sawing a cylindrical curved cut 49 having an axis 58 which is located in the last above the plane of the axes of the hinge pin holes. The upper portion of the last is then sawed in converging planes 5| and 52 from the heel and arch portions of the last respectively to the circular cut 49, thereby severing the toe portion of the last from the heel portion in such a manner that when the last is assembled the circular periphery of the heel portion of the last fits into a complementary socket in the toe portion and provides a pivot about which the last may be swung around the axis 50. After the parts of the last have been separated the front and rear portions of the last are routed out longitudinally through a narrow area 53 which extends beyond the hinge pin holes and removes the webs 41 between the adjacent ends of the axially alined holes. The area thus routed out provides a space for the usual link or links which are pivotally mounted upon the hinge pins which are inserted in the hinge pin holes.

By reason of the fact that the oppositely dis posed drills are held in axial alinement by the templets l0 and I l and are required to drill only approximately half through the wood of the last, diversion of the drills by encountering portions of the wood of different hardness is avoided and parallelism of the hinge pins is insured, so that when the last is assembled the toe and heel portions will be restored accurately to their normal positions and binding entirely avoided.

A modified form of the invention is shown in Figs. 6 and '7 in which the last is placed upon the bed of the machine and the templet and clamping mechanism mainly carried by a pivotally mounted overhanging beam. In this construction the base 54 of the supporting and clamping mechanism is of preferably rectangular form and is provided at its rear end with suitable guideways 55 in which the base of an abutting member 58, similar to the abutting member 4|, may be mounted and forced forwardly by springs 5! similar to the springs 45 above described. The opposite end of the base 54 has secured to it or mounted upon it a vertical stand or standards 58. A beam 59 is pivotally mounted upon a shaft 68 in the upper end of the standard and extends longitudinally of the base 54: The beam 59 may be of sheet steel of channel form, as illustrated in Fig. '7, of considerably greater width than the width of the last and the flanges SI and 82 thereof each provided with a pair of integral vertical extensions 63 forming templets having holes or guideways 84 for the drills of the respective pairs illustrated in Fig. 1. Longitudinally extending rails 65 and 88 and reenforcing bars 81 are welded, or otherwise secured to the inner faces of the flanges 8| and 82. as illustrated in Fig. 7. A pin 98 corresponding to the Jack pin of the lasting machine and adapted to engage the thimble ii of the last is pivotally mounted upon a rod 89 the ends of which are mounted intherails 65 and 88 and spacing sleeves 18 and II surrounding the rod 89 which are interposed between the rails and pin prevent lateral movement of the pin upon the rod 69.

By reason of this pivotal connection of the jack pin 88 suflicient longitudinal movement of the last is permitted to enable it properly to be positioned longitudinally for the drilling of the hinge pin holes.

vMeans are provided to engage the arch portion 01' the last which as illustrated in Figs. 6 and 7 comprises converging plates 12 and 13 having at their upper ends contacting integral bosses 14 which are mounted upon a rod 15 journalled at its ends in the rails 65 and 66 in the manner above described. A suitable detachable resilient member 18 adapted to fit the arch portion of the last is held between the plates 12 and 13. A rod 11, which is pivotally mounted upon a rod 18 in a similar manner, depends from the central portion of the beam 29 over the toe portion of the last and has telescopically mounted upon it a cylindrical sleeve 19 having a head 88 to engage the toe portion of the last. The sleeve 19 is provided at its upper portion with a longitudinal slot 8| which is engaged by a pin 82 projecting from the rod 11 to prevent rotation of the sleeve relatively to the rod. A helical spring 83, which is interposed between the lower end of the rod 11 and the head 88 of the sleeve, serves to cause the head to engage the toe portion of the last with a yieldable pressure.

Suitable means are provided for vertically adjusting and clamping the toe portion of the last. In the construction illustrated herein a wedgeshaped block 84 is slidably mounted in a suitable guideway 85 in the base and is provided with an integral forwardly extending rack 88 engaged by a gear 81 fixedly secured upon a vertical shaft 88 which is mounted in the bed 54 and provided at its upper end with a knurled head 89 to facilitate rotation of the shaft 88. The rack is clamped upon the bed by an offset clamping plate 99 which is secured to the bed by machine screws.

Suitable means are provided for clamping the toe portion of the last against lateral displacement. As illustrated herein clamping jaws 9i and 92 are slidably mounted upon a rod 93 which passes through the block 84. These clamping jaws desirably are of substantially rectangular form with their fiat edges resting upon the bed plate. Screw threaded members 94 and 95 mounted in opposite sides of the block 84 and having means for engaging the clamping jaws 92 provide means for adjusting the jaws firmly against the sides of the toe portion of the last. 7

Suitable means are provided for locking the beam 59 in depressed position. A convenient device which is illustrated herein comprises a lever 96 which is mounted upon a rod 91 at the rear end of the beam 59 and is provided with a handle 98 and near its pivot with a recess 89 so constructed that when the beam is depressed and the handle forced inwardly it will engage beneath the extension I88 of the abutment member 58.

In the operation of the construction illustrated in Figs. 6, 7, and 8, the last is first placed upon the bed, the beam 58 thereupon swung downwardly until the jack pin 68 enters the thimble I5 of the last. The wedge-shaped support 84 for the front end of the last is then adjusted by turning the milled head 89 of the pinion 01, which actuates the rack 86, in a proper direction to raise the toe portion of the last suificient- 1y to locate the guides 64 of the templets 63 properly with respect to the positions of the hinge pin holes which are to be bored, the last being moved longitudinally if necessary during such adjustment. The clamping jaws 9| and 92 are then adjusted by rotating the screws 94 and 95 respectively to clamp the last fixedly in position. The toe portion of the last is held down by the spring pressed head 80 of the sleeve 99. When properly positioned the lever 98 is swung downwardly to engage beneath the extension I00 oi the abutting member which yieldably engages the heel of the last. The drilling mechanism, which is similar to that diagrammatically shown in Figs. 1 and 2, is then actuated to cause the drills to penetrate the last from opposite sides in the manner as above described and the penetration of the drills arrested before the ends of the axially alined drills meet. The last is then cut and routed in the manner above described.

It will be understood that the novel method of boring hinge pin holes for lasts above described can thus be performed either upon the machines illustrated respectively in Figs. 1 to 5, or 6 to 8 of the drawings, or that the method may be performed by hand by two operatives simultaneously actuating oppositely alined drills guided accurately in any suitable manner.

It will also be understood that the particular mechanisms for performing the method are of an illustrative character and that various changes in construction and arrangement of parts may be made within the spirit and scope of the following claim.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

Steps in the method of making two-part lasts having hinge pins in the heel part and fore part of the last which consists first, in simultaneously drilling in the heel and fore portions respectively 15 of an undivided last axially alined holes for both of the hinge pins from predetermined points on opposite sides of the last approximately to the longitudinal central plane of the last, but leaving a narrow web of material between the adjacent ends of the bores. second, cutting the last in such manner as to form a fore part and a heel part and providingv for pivotal movement therebetween and third, routing the respective fore and heel portions centrally and longitudinally of the last from the complementary abutting surfaces to provide a, hinge recess communicating with the bores for the hinge pins.

JOHN M. MADIGAN.

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