US1770022A

US1770022A - Jig for last-drilling machines

Info

Publication number: US1770022A
Application number: US116351A
Authority: US
Inventors: Frederic E Bertrand
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1926-06-16
Filing date: 1926-06-16
Publication date: 1930-07-08
Anticipated expiration: 1947-07-08

Description

July 8,1930- I F. E. BERTRANDv .v l 1,770,022

JIG FOR LAST DRILLING MACHINES Filed June 16, 1926 2 Sheets-Sheet l Fig". 1.

July 8, 1.930-` AF. E. BERTRAND V 1,770,022

JG FOR LA ST DRILLING MACHINES Filed June 16. 1926 2 Sheets-Sheet 2 f6 Figa Patented July 8, 1930 j unirse srarss PATENT' oFFicE FREDERIC E. BERTRAND, OE LYNN, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATIGN, OF PATERSON, NEW JERSEY, lA CORPORATION F NEW y JERSEY Application lecl June 16,

This invention relates to machines for making holes in lasts and is illustrated as einbodied in a machine of the type set forth in United States Letters Patent No. 1,624,916,

granted April 19, 1927, on my application.

Machines of the type referred to are designed to bore holes through the rear ends of lasts from the heel seat faces of the lasts to the tops of the cones of the lasts to adapt each io last to receive a screw fastener which is passed through the last and through the heel seat of a shoe on the last into a Wood heel on the shoe as a temporary means for securing together the heel, the shoe and the last in aci cordance with the method disclosed in copending application, Serial No. 367,173,

- filed April 29, 1924i, Patent No. 1,615,258 dated J an. 25, 1922, in the name of Maurice Y V. Bresnahan. For this purpose such a machine comprises a drill and last holding means, the latter including a member arranged to engage a previously formed hole in the central portion of the heel plate of the last and another member arranged to enter the usual spindle or thimble hole of the last to co-operate with the first-mentioned member to position the heelend or" the last transversely With respect to theA axis of the drill. Provision is also made in such a machine for tilting a lastlongitudinally to predetermine the angle of the hole longitudinally of the last to insure that the drill Will not encounter any obstruction such, for example, as a rivet or other fitting in its passage through the last and to permit variation in the angle of the hole, if desired, in accordance With the style or shape of a particular type of heel so that the screw fastener may be driven into the heel at the angle best adapted to facilitate secure attachment of the heel.

liVhile machines so organizedhave operated accurately and otherwise satisfactorily it has been found that sometimes the holes in the heel plates have not been uniformly located transversely of the heel seat surfaces of the lasts and that, similarly, variations in the positions of the thimble holes transversely of the lasts have been encountered.

In view of these conditions one object of the present invention is to provide an im- J'IG FOR LAST-DRILLING MACHINES 1926. Serial N0. 116,351.

the desired accurate location of the holes transversely of the last. d To the accomplishment of this object, one -feature of the present invention consists in the provision of an improved machine comprising a drill, and a jig for holding a last and predetermining in definite transverse relation to the last the locations in the top and bottom faces of the last ofthe opposite ends of the hole to be bored by the drill, the drill and the last holding part of the jig being relatively movable to lpermit longitudinal tilting adjustment of the last to vary the angle of the hole longitudinally of the last Without changing the locations of the ends of the hole transversely of the last.

l In the illustrative embodiment of the invention herein shown, the means for predetermining the transverse locations of the opposite ends of the hole in the last comprise a device arranged to engage the last (or the outside of a shoe on the last) at spaced points around the top portion of the last or the shoe and other members arranged similarly to engage the outside of the shoe at spaced points around its counter portion near the bottom thereof, said device functioning independently' of said members to position the top of the last in a predetermined transverse relation to the axis of the drill and said members operating independently of said device is adjustable so that it may be set to position v the top of the last in a transverse central relation to the drill axis or to position the top of the last eccentrically With respect to the axis of the drill sufficiently to compensate for the thrust of the drill so that after the hole has been bored it Will be accurately cenfl# provision is made, as shown, .for tipping the` last longitudinally about an axis which 1 s perpendicular to the axis of the drill and which is arranged to intersect the drill axis at the center of the seat surface of the last.

i Another object ofthe invention is to provide an improved machine of the type referred to in which the last supporting and positioning meansmay be adjusted to enable j them to receive lasts presented thereto at any angle ,which may be found most convenient for an operator.

Vith this object lin view, another feature of the invention consists in the provision of a last holding and positioning jig or fixture which is provided with novel means for predetermining the angular relation of a last to a drill and which is adapted to be tiltably adjusted bodily about an axis coincident with the axis ofthe drill to facilitate the presentation of lasts tothe device at different angles. i Further. objects and features `of the invention will be explained in the following descript'ion, reference beinghad to the accomn panying drawings, inwhich Fig. 1 is a view in front elevation of a portion of a machine embodying the features of the invention;

Fig. 2 is a view, rpartially in elevation and partially in section, ofa portion of the machineshowing particularly the work positioning devices and their `relation to the drill, the worlr positioning devices being shown as they would appearto an observer looking inthe l direction of the arrow X in Figff,

Figg isan elevational view, as seen from v`the left-hand end of the machine, of the device for locating the lower portion of the heel end Vof, a last relatively to the drill;

Fig-1- is an'elevational` view of the righth and end of `the machine; and Y Fig5 isa plan view of thevportion of -th machineshowninFig. 1the work locating j ,and holdingdevices being shown as they appear when viewed in the direction: of the `arrow Y inl Fig. 4. Y

Referring to the drawings, the machine therem shown ,consists of a drill8 and Ya jigv or fixture 10. 4The drill8 is Vrigidly.secured to one endof the armature shaft. of an electric motor (notshown). ry-llhe jig 10, comprisinglastpositioning and holding devices,

is AsupportedY upon carriage 20Hslidably mounted upon a horizontal guide rod 127 the ends of which are secured in lugs (such as the lug 14 shown in Fig. 1) formed upon a base 16 upon which the motor may be mounted. Theguide rod 12 is parallel to the axis of the drill and in order that a last held by the jig 10 may be moved toward the drill to cause the drill to bore'through the last, the carriage 2O is arranged to be moved toward and from the drill on the guide rod 12between suitably positioned stops by means of a hand lever not herein shown but which may be connected with the carriage by means of a link 22 (Fig. 1) in a manner similar to that described in my Letters Patent above referred to. The drill 8 extends through a bearing sleeve 18V which is supported in a portion of the jig 10. The above described mounting `and arrangement of the drill and the motor laxis coincident with the axis of the drill, while the frame V28 is mounted within the yokes'haped frame 26 and is pivoted to the sides of the yoke for angular or tilting adjustment labout -an axis which is perpendicular to the .drill axis and which is further so disposed with respect to the last holding and positioning devices as to intersect the drill axis at the Vcenter of the heel seat surface of a last, such as the last L, supported by the holding` device. The outer or yoke-shaped frame 26 is provided at one end with a hollow hub 32 which `is received within a split bearing sleeve 30 formed on the carriage 20 in axial alinement with the drill guiding sleeve 18. The hub 32' is adapted to be rotatably adjust-ed in thesleeve 30 for the purpose of tilting the frame 26 about the axis of the drill and a clamping bolt 34 extendsthrough the split portion of the bearingsleeve 8O forthe purpose of tightening the sleeve uponthe hub 32 to secure the frame 26 in adjusted position. r1`his constructionr enables the last holding and posi- --tioning devices to be tilted so that a last may be presented thereto in an inclined position which maybe found most convenient for the` operatorit being pointed out that when a last is held by grasping its forepart with one hand it is more natural to present it to the holding devices in an inclined than in a,v substantially horizontal or in a substantially vertical position. K

At the end of the outer frame 26 opposite the hub 32 an .aperture is formed ,to receive a bushing 36 Vwithin which the sleeve 18 is adapted to turn freely. The sleeve 18 is held against axial displacement within the bushing 36 by means of an annular shoulder 38 at one end of the sleeve and a collar 40 which is secured to the opposite end of the sleeve, said collar and shoulder engaging opposite ends of the bushing 36. As shown, alug 42 (Fig. 2) formed upon the interior of the bearing sleeve 18 projects into the flute of the drill, thus connecting the sleeve to the drill so that while the sleeve and the drill will turn in unison within the bushing 36 when the drill is not operating upon the work the sleeve 18 is capable of sliding longitudinally relatively to the drill. rlhus, when the carriage 2O with the jig l0 is advanced to present at last to the drill the sleeve 18 is caused to slide longitudinally of the drill, the lug 42 riding along the iute of the drill in a direction away from the point or free end of the drill. Upon the return movement of the carriage 20 the lug 42 travels in the opposite direction, that is, toward the point of the drill at which time it functions to clear the flute of the drill of any chips which may have accumulated therein as a result of the preceding boring operation.

The inner frame 28, as shown in Figs. l and 2, consists of a substantially L-shaped member having a portion 29, constituting the shorter leg of the L, which is apertured at 3l to permit the passage of the drill therethrough. The portion 29 of the frame 28 is provided with alined trunnions 44 which are received in bearings in the opposite sides of the outer frame 26, this arrangement enabling the inner frame 28 to be tilted about an axis at right angles to the axis of the drill, thus providing for variation in the longitudinal angular relation of the last with respect to the drill so that a hole may be bored at any desired angle longitudinally of a last without changing the location of the end of the hole in the last bottom. For securing the inner frame 28 in different positions of tilting adjustment relatively to the outer frame and to the axis of the drill, a binding screw 46, having threaded engagement with the inner frame 28, extends through an arcuate slot 48 in theV outer fra-me 26, the arcuate slot being curved abouta center Within the common axis of t-he trunnions 44. Upon loosening the binding screw 46, tilting adjustment of the inner frame 28 may be effected manually merely by grasping a convenient portion of the inner frame and tilting it as may be required.

For the purpose of supporting a last while it is being operated upon by the drill, the portion 29 of the frame 28 is provided with two raised bearing surfaces 50 and 52 (Fig. l) constituting'a two-point bearing for Athe last bottom, and the opposite end portion of the frame 28 carries a clamp member 54Vfor engaging the top face of the cone of the last to co-operate with the bea-ring surfaces 50 and 52 securely to hold the last in place in the 10. The bearing surface 50 is arranged to engage the heel seat portion of the last at a point forward of the center of the heel seat, while the bearing surface 52 consists of the inclined face of a cam or wedge block 56 which is adjustably mounted upon the portion 29 of the frame 28 and which is arranged to engage the rear edge portion of the last bottom. The clamp member 54 is carried at the inner end of a rod 58 which is screw-threaded through the outer end portion of the longer arm of the frame 28 and is provided at its outer end with a knurled head 60 by means of which it may be turned to move the clamp member 54 into and out of holding engagement with the last. its shown, the clamp member 54 has a ball and socket joint connection with its supporting rod 58 which enables it readily to adjust itself to the plane of the top surface of the cone of the last which it engages.

Before the clamp member 54 is manipulated, however, to clamp the last in position to be drilled, the last is positioned both longitudinally and transversely with respect to the drill so that the latter will enter the last at the center of the heel seat surface of the last bottom and will make a hole extending through the last and terminating at a predetermined location transversely of the top surface of the cone portion of the last. For the purpose of locating the last longitudinally for the drilling operation, the inclined surface 52 of the cam or wedge block 56 is interrupted by means of a notch which extends transversely across said face and provides a shoulder 62 which serves as an abutment to limit the rearward movement of the last and positively to locate the last longitudin ally with the center of its heel seat surface in line with the drill. being pushed rearwardly over the inclined face of the wedge block 56 said face func- Vtions to impart a slight longitudinal tilting movement to the last for a purpose hereinafter to be described. p

To adapt the positioning shoulder 62 for use with lasts of different sizes the wedge block 56 is made adjustable toward and from the axis of the drill. To this end, the wedge block is provided with a rearwardly extending shank portion 64, as shown in Fig. 5, which is slidably mounted in a guideway in a lug 66 formed on the portion 29 of the frame 28 and is provided with a series of notches 68 adapted to be selectively engaged by the periphery of a locking disk 70. The locking `disk 70 is mounted to turn upon a rod 72 which is parallel to the shank 64 and is splined in the lug 66. Normally, the locking disk 70 is held in a rearward position against a head 7 4 on the rod 7 2 by means of a spring 76 which is coiled around the rod As the last is lll) Y72 between the locking disk and the lug 66.

To enable the locking disk to be disengaged from one vof the notches 68 in the shank which f carries the wedge block a portion of the peylo disk, thus shifting the location of the wedge block and the locating shoulder 62 relatively yto the drill. When theV rearmost notch 68 is engaged by the locking disk 70 the locating shoulder 62 is located to position the smallest size `last properly in a lengthwise direction with respect to the drill. This setting of the locating shoulder and wedge block is adapted for use with several of the smaller sizes of lasts. For 'several of the next larger sizes the locking disk 70 should be engaged. with the second notch 68 while the remaining notches 68 may be engaged by the locking disk for the purpose of positioning the locating shoul- Vder 62 for use in connection with lasts of still larger sizes.

In addition to being located longitudinally, as just described, tlielast is also located transversely with respect to the drill in a manner to insure the greatest accuracy in determining the locations of the opposite ends of the fastener-receiving hole in the top and bottom faces, respectively, of the last. To this end A separate devices are provided for independently locating the bottom and top portions of the heel end of the last transversely relatively i to the drill.

The means lfor transversely locating the bottom portion of the heel end of the last comprises a last centering device which is shown in detail in Fig.

This last center- Ving device comprises a pair of centering lingers which are `pivotally mounted uponl To .enablel them to perform their last centerthe portion 29 ofthe frame 28 at points equally spaced at opposite sides of the drill.

y ing function these fingers 80 are arrange-d to engage opposite sidesof thezlast at points nearthe last bottom 'and they are spring pressed inwardly andareconnected together for movement both inwardly and outwardly in unison. The inner end of each centering finger 80 is made in the form of a vyokeas shown at 81, to straddle the portion 29 of the frame 28, and the ends of the yoke Vport-ions 81 are mounted upon pivot studs 82 carried bythe Vframe 28.`l

. VTo insure that the centering fingers 80 i shall move `in'unison toward and from each othergthe yoked portions of the fingers are lprovidedwith extensions 84 which approach eachother and are operatively connected with y i head 86 on a slide rod 88 which is mounted The connections between the extensions 84 of the centering lingers 80 and the head 86 cornprise pins or studs 92 which are carried by the extensions 84 and are received in notches 94 in the head 86. To hold the centering iingers normally in positions to be engaged and spread apart by a last the slide rod 88 is acted upon by a spring 96 which is coiled about the rear end of the rod 88, one end of the spring engaging the lug while the opposite end of the spring engages the innermost of two nuts 98 on the rod 88. The limit of approach of the centering lingers 80 is determined by means of an adjustable abutment Vin the form of a screw 100-which extends through the lug 90 and is adapted to be held in adjusted position by a set screw 102. rThe nuts 98 may be turned to vary the tension of the spring 96 so as to regulate the pressure exerted by the centering fingers upon the last and a handle 104 is connected with one of the centering fingers by means of which the force tending to move these fingers inwardly may be relieved if desirable to facilitate the introduction of the last between them.

The means for locating the upper portion of the rear end of the last transversely with respect to the drill comprises a locating device indicated at 108. This device 108 is provided with a pair of oppositely inclined loeating faces 110 arranged to engage the opposite lateral edges of the top face at the heel end of the last. The locating faces 110 `are carried by a head 112 which is rigidly secured to the inner end of a hollow shaft 114 that is sp'lined within the hollow hub 82 of the outer frame 26. Y For the purpose of causing the locating device 108 to engage a last uyieldingly,the head 112 is acted upon by a coiledspring 1-16 which is arranged within the hollow shaft 114, the spring acting at one end against a shoulder formed at the inner extremity of the recess in the shaft 114 and at the other'end against the baise of a thimble 118 which is secured by means of screws 120 to the outer end of the hub 82, the interior Aofthe thimble 118 being alined Ywith the shaft 114 and adapted to receive the latter' as the Vlocating device'108 Ais displaced by engagement of alast therewith or as the said device is adjusted forvusein connection with the larger sizes of lasts. The inward movement ofthe locating device 108 under the influence of the spring 116 is limited by the engagement with the end of the thimble 118 of a knurled nut 122 on a rod 124 which extends through the thimble and the hollow shaft 114 Within the coils of the spring 116 and is secured at its inner end'to the head 112. By turning the nut 122 the locating device 108 Y, may be located relatively to the last supporting surfaces 50 and-52 as best adapted for the height of the last to be operated upon. On account of the length of the spring 116 such in abearing lug 90formedon the frame 28.V `adjustment'of the locating device 108 will not materially affect the tension of the spring 116. To insure that the locating device 108 may be firmly secured in adjusted position heightwise of the last a spring linger 126 secured to the thimble 118 is arranged to interengage with the serrations on the periphery of the knurled adjusting nut 122. Y j

The action of the drill on the last may have some tendency to displace the last slightly from its transversely located position. To oset any such tendency of the drill it may be desirable to locate the inclined faces 110 of the positioning device 108 so that the upper portion of the last will be slightly ofl'set laterally from a true central position with respect to the axis of the drill. To enable such an adjustment to be effected, the inclined faces 110, as shown, are formed upon plates 128 which are secured tothe head 112 by means of screws 130 which extend through longitudinal slots 132 in said plates and are threaded into the head 112. rlhis arrangement enables the plates 128 to be adjusted in either direction transversely of a last engaged thereby to compensate for the lateral thrust of the drill, or to insure that the upper portion of the last is located centrally with respect to the drill axis, as may be desired. lf found to be unnecessary to compensate for the thrust of the drill the plates 128 will be adj usted so as accurately to centralize the top portion of the cone of the last transversely relatively to the drill.

When a last is to be drilled by means of the illustrated machine the forepart of the last is grasped by the operator and the heel end of the last is presented to the work positioning devise of the machine. As hereinbefore mentioned a last, when grasped by the forepart, is most naturally held in a position inclined more or less sharply to the horizontal and with the heel end of the last uppermost. In order to receive a last presented thereto in such an inclined position the outer frame 26 of the machine may be adjusted into some such angular position as that indicated in Figs. 1 and 4, and rigidly secured in this position by means of the binding screw 34. The inner frame 28 will be manually adjusted (angularly about its trunnions 44) so that when a last has been clamped in place it will be so positioned relatively to the drill that the hole bored by the latter will extend through the last at approximately the desired angle longitudinally of the last. lf it should be found that the drill in passing through the last would encounter a metallic fitting, such as a rivet, or any other obstruction, the path of the drill through the last may be changed by tilting the frame 28 about its trunnions 44 to change the longitudinal angular rela-tion of the last to the drill. The frame 28 may be adjusted in a similar manner for the purpose of adapting the angle of the hole in the last to the shape or style of a of heel which is to be used.

As the heel end of the last is presented to the locating devices, the heel seat surface of the last engages first the raised bearing face 50 and thereafter engages and slides over the inclined face of the cam block 56 until the rear edge of the heel plate or rear end portion of the last bottom engages the shoulder or abutment 62 on the cam block. The shoulder 62 arrests the rearward movement of the last and locates the last with the longitudinal center of its heel seat portion intersecting the axis of the drill. As the last is pushed rearwardly into the machine the lower portion of its heel end enters between the centering fingers 80 which yield outwardly in unison and in equal amounts, thus serving to center the lower portion of the heel end of the last transversely with respect to the drill.v The upper portion at the heel end of the last is centered or located transversely with respect to the drill independently of the lower portion of the heelvend, this being desirable on account of the fact that the upper portion of the last is usually not in alinement with the transverse center of the bottom portion of the last, but is offset more or less to one side or the other according to whether the last is for a right or a left shoe. To insure that the inclined face 110 of the locating device for the upper portion at the heel end of the last shall function properly said device is mounted so as to yield somewhat heightwise of the last as the last is being moved into engagement therewith. In order that the device 108 shall be so positioned as not to interfere with the convenient introduction of the last intok the machine the device is preferably adjusted by manipulation of the nut particular type -122 in such spaced relation to the bearing surface which engages the last bottom that as the last is being pushed rearwardly across the bearing face 50 the cone of the last will slide between the faces 110 without effecting any substantial outward displacement of the head 112. However, as the rear end portion of the last bottom engages and rides upwardly over the inclined surface of the wedge block 56 the last is tilted bodily in such a manner as to move the cone portion of the last outwardly in the direction of the axis of the shaft 114 which carries the head 112, thus causing the head 112 to yield outwardly against the action of the spring 116 and insuring that both inclined faces 110 function properly to position the top of the last transversely with respect to the drill. As hereinbefore pointed out the adjustment of the plates 128 which is permited' by the screw and slot connections 130,132 between the plates and the head 112 enables the top portion of the last to be located transversely invsuch a position that the center of the top face will be somewhat offset from the path transverse relation relatively to the drill of' the bottom of the last and means to locate the Vtop of the last inpredetermined eccentric relation transversely with respect to the axis of vthe drill to compensate for the thrust of the drill.

2. In a drilling machine for lasts, a last holding vand positioning device comprising a frame tiltable about an axis transverse to the axis ofthe drill to vary the angle lengthwise of the last'of the hole to be made by the drill, means on said frame for locating the bottom of the last transversely with respect to the drill, a second" framev carrying the first frame and havingadevice yieldably mounted thereon for positioning the top of the last transversely with respect to the drill, and a' cam member on the first frame for tilting the last longitudinally as it is moved into engagement with said member to insure yielding engagement ofthe last with said yieldingly mounted member.

` 3. In a drilling machine for lasts, a carriage slidable axially of the drill, a last holding devicepivotally mounted on the carriage fory tilting adjustment about an axis intersecting the axis of the drill, Vmeans on the carriage for centering thebottoni of the last transversely relatively tothe drill," ayieldingly mounted device for determiningthe transverse position ofthetop of the last relatively to the drill, a spring arranged to press said device toward saidcentering means, arcani member on the last holding device for* forcing the last intoV yielding engagement with said yieldingdevice, and meansrfor limiting the movement of said device under the action of the spring.

4. In a drilling machine for lasts, a carriage slidableaxially of the drill, a last holding device pivotally mounted on the carriage for tiltingadjustment about an axis intersecting the axis of the drill, means on the carriage for centering the bottom of the last transversely relatively to the drill, a yieldingly mounted device for determining the transverse position of the top of the last relatively to the drill, a spring arranged to press said device toward said centering means, a cam member on the last holding `device for forcing the last in yielding vengagement with said yielding device, and means for varying the extent of compression of the spring.

5. In a drilling machine for lasts, a carriage slidable axially of the drill, aframe pivotally mounted on thek carriage for tilting adjustment about an axis coincident with the axis of.

the drill and having means for positioning the top of a last relatively to the drill, a second frame pivotally 'mounted on the first frame for angular adjustment about-an axis perpendicular to the drill axis, and means on the second frame for positioning the bottom of a last transversely relatively to the drill and for rigidly supporting the last in transversely adjusted position, the axis of tilting adjustment of the second frame being arranged to intersect theldrill axis at the center of the heel seat surface of the last. 4

6. In a drilling machine for lasts, a carriage slidableA axially of the drill, a frame pivotally mounted on the carriage for tilting adjustment. about an axis coincident with the axis of the drill and'having meansfor positioning the top of a. last'relatively to the drill, means for rigidly securing said frame in adjusted position relatively to the carriage, a second frame plvotally mounted on the first frame for angular adjustment about an axis perpendicular to the axis ofthe drill,

means on the first-frame for securing the sec-- ondrframe in angularly adjusted position, and means on the second frame for positioning the bottom of the last transversely rela tively to the drill and for rigidly supporting the last.

7. In ajdrilling machine for lasts, a carriage slidable axially of the drill, a frame pivotally mounted on the carriage for' tilting adjustment about an axis coincident with the axis of the drill and Vhaving means for positioning the top of a last relatively to the drill, means forrigidly securing said frame in adjusted position relatively to the carriage, a second frame pivotally mounted on'the first frame for langular adjustment about an axis perpendicular to theaxis of the drill, means on the first frame forv securing lthe second frame in angularly adjustedposition, means on the second frame for positioning the bottom of the last transversely relatively to the drill,-a two point bearing on the second frame `for engaging the heel seat surface of the last, and adjustable means for engaging the top of the cone of the last and co-operating with said two point bearing for holding the last in place.

8. In a drilling machine forlasts, a carriage slidable axially of the drill, a frame pivotally mounted on the carriage for tilting adjustment about an axis coincident with the axis of the drill and having means for positioning the top of a last relatively to the drill, means for rigidly securing said frame in adjusted position relatively to the carriage, a second frame pivotally mounted on the iirst frame for angular` adjustment about an axis perpendicular to the axis of the drill, means on the first frame for securing the second frame in angularly adjusted position, and means on the second' frame for IGR centering transversely and longitudinally the bottom of the last relatively to the drill.

9.l In a drilling machine for lasts, a carriage slidable axially of the drill, a frame pivotally mounted on the carriage for tilting adjustment about an axis coincident With the axis of the drill and having' means for positioning the top of a last relatively to the drill, means for rigidly securing said frame in adjusted position relatively to the carriage, a second traine pivotally mounted onY the lirst frame for angular adjustment about an axis perpendicular to the axis of the drill, means on the rst frame for securing the second frame in angularly adjusted position, means on the second frame for transversely centering the last Witli respect to the drill, and adjustable means on the secon fl frame for determining' the position of the last longitudinally with respect to the drill.

10. In a drilling machine for lasts, a carriage slidable axially of the drill, a frame pivotally mounted on the carriage, centering` r) fingers mounted on said frame and connected for engaging opposite sides of the lower portion at the heel end of a last and connected to move uniformly When separated by the introduction of a last between them, means M for adjusting the limits of approach and separation of said lingers, means for engaging the heel seat surface of the last including a cam member for tilting the rear end of the last, yielding means for co-oper- 35 ating with said cam member to center the upper portion at the rear end of the last transversely with respect to the drill, and means co-operating with the heel seat surface engaging means for rigidly supporting m the last While it is being' drilled.

In testimony whereof I have signed my name to this specification.

FREDERIC E. BERTRAND.