US2479630A - Pressure mechanism - Google Patents

Description

Aug. 23, 1949. J. T. LANCASTER 7 PRESSURE MECHANISM 4 7 Filed Oct. 10, 1945 5 Sheets-Sheet 1 Inventor John 7.' Lancasfer Aug, 23, 1949. J. T. LANCASTER 2,479,630

' PRESSURE MECHANISM Filed Oct. 10, 1945 5 Sheets-Sheet 2 Inventor John 7. Lancasfer I B 11; Aorney Aug. 23, 1949.. J. T. LANCASTER PRESSURE MECHANISM 5 Sheets-Sheet 5 Fil ed Oct. 10, 1945 Invenmr John 7; Lonqasfer 1949- J. T. LANCASTER 2,479,630

PRESSURE MECHANISM Filed Oct. 10, 1945 5 Sheets-Sheet 4 w i k/ff Inven tor John 77Lancasfer I Aug. 23, 1949. J. T. LANCASTER PRESSURE MECHANISM 5 Sheets-Sheet 5 Filed Oct. 10, 1945 [71 van for John 7." Laneasfer 130 T v I H Patented Aug. 23, 1949 PRESSURE MECHANISM John T. Lancaster, Newton, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application October 10, 1945, Serial No. 621,522

24 Claims. (Cl. 1-32) My invention relates to mechanism for applying to work-parts pressure by which they may be held for the performance of an operation upon them. As herein disclosed, the invention is utilized for clamping upon the heel-seat of a shoe a heel to be attached by nailing it through the heel-seat into the heel.

In an operation of the character above indicated, such a work-part as a heel, after having been positioned by the operator, must be retained against both lateral and longitudinal displacement to resist the heavy operating forces applied. An object of the present invention is to effect this retention by simple mechanism which renders the work accessible to the operator and not only applies and holds effectively the clamping pressure, but also enters actively into insuring the correct location of the work. For the attainment of this object, I combine with a frame having a fixed outwardly extending arm, a Work-support or jack carried by the frame beneath the arm, upon which arm are three work-clamping abutment devices a portion of which are guided for movement directly in the fixed arm downwardly and inwardly into clamping engagement with the work. In operating upon a heel upon a jacked shoe, these devices engage the peripheral surface of the heel, as at its opposite sides, and the treadsurface. In movement of the devices on the stationary frame-portion, only elements of small mass are necessary, these being readily guided for smooth and easy actuation. The peripheral abutments may be first operated to centralize the work prior to its final clamping, when the treadabutment engages it. The peripheral abutments are also preferably so organized as to exert a forward locating force, which, when applied to a heel, will seat it against the breast-cut in the shoe-sole. After this positioning action, the tread-abutment becomes active to exert, with its companions, the final clamping action. The abutment devices, regardless of their particular application, are preferably in the form of spindles guided upon the frame and provided with threads engaged by nuts. The nuts are shown as provided with external gear-teeth, which, through trains of gearing, are rotated by connection to a slide or other actuating member. The pitch of the cooperating screw-threads is such that the spindles are locked against retraction through reaction of the pressure applied to the work. To obtain the correctly timed movement of the work-clamping devices, a lock is provided for the tread-abutment, when a heel is being operated upon, which look may act on the abutment-gearing. After the side 'abutments have attained the desired relation to the work, to permit operation of the tread-abutment the lock is released upon movement of the actuating member, as by means movable with the gearing for the side abutments. When all the 'abutments have engaged the Work, a balanced pressure is preferably applied. This may be effected through an equal-arm-lever fulcrumed upon the actuating member or slide and con- ,nected at its ends to two trains of gearing. For

inclusion in such machines as thoseby which heels are attached, the abutment device which engages the tread-surface of the heel is adjustable so the axis of its spindle may be normal to said surface.

,This spindle herein appears as operating through a support guided along a curved path, there being means arranged to vary the position of the support and thus the inclination of the spindle.

In the accompanying drawings, illustrating one of the several possible embodiments of this invention,

Fig. 1 is a front elevation of the upper portion of a heel-attaching machine, including my improved pressure mechanism;

Fig. 2, a side elevation thereof;

Fig. 3, a rear elevation of the abutment-operating mechanism;

Figs. 4 and 5 are horizontal sections on the lines IV-IV and V-V, respectively, of Fig. 3;

Fig. 6 is a sectional detail of a portion of the gearing for the side abutments;

"anism is to become eiiective to lower the tread Fig. 7, a detail top plan view of the side abutment members in engagement with a heel;

Fig. 8 is a rear elevation, showing the position of the parts at the instant when the tread mechabutment; and

Fig. 9 is a rear elevation showing the position of the parts when both the side and tread abutments have become effective to clamp the heel and the pressure between them has been equalized. I

The machine in connection with which I have chosen to disclose my invention is of the general character of that made the subject of Letters Patent of the United States No. 1,545,575, Standish, July 14, 1925. This has a vertical column [0, at the front of which is a support or jack I2 having reciprocating in its vertical passages drivers I 4 to insert nails N, which they carry, through the heel-seat of a jacked shoe s, into an applied heel h clamped in place to resist the nail-inserting thrust of the drivers by the holddown of the present invention.

Extending forward from the top of the column 3 is a fixed arm A having a rear wall I6, spaced vertical side walls l8, l8 and a horizontal top wall 20. At the lower forward portion of each side wall are inwardly inclined extensions 22, from each of which project spaced arms 24, 24 serving as guides for downwardly and inwardly inclined abutment devices S, S for engagement with the periphery of the heel at the'sides and rear. Located midwaybetween and in front of the arm exten'sions 22 is a forwardly and downwardly curved extension 26,. in which is guided for angular adjustment a support 28 for an abutment device T, for engagement;

with the tread-surface of the heel. This adjustment permits the device T tof'move into clamping engagement with all heels along lines normal-to. their tread-surfaces. The form of the side walls of the heels is such that effective engagement of. the abutments S may be had without adjustment As to the adjustment oft-the abutment device T,

the arm-extension '26 has opposite curved ways 3flj'f3fii 'irr'which a" correspondingly curved portion of the-support28 is'guided. The curve of the on the wallizfi' of the arm A; When the screw is rotated through ahand wheel 28 on its forward extremity, the resulting movement of the'traveler i2'is communicated'to the supporti28 through the engagement ofthe shaft 60 with the wall of the slot 38. The supportis thus shifted'forwardly'orrearwardly along the curved ways 30 of'the arm-extension 25;and thus 'angularly, to establish the desired relation of'thedevice 'I'to the..treadl-surface. of the heel h. This device. is

shown herein as consisting of'a spindle 56 guided for axiahmovement through the walls 32;"32.of

the support, 2811 The, spindlehas at its lower.

extremity anenlargement 52', the surface 540i which is, by "the. adjustment. just described, brought. into. parallelism with the tread-surface of'the' heel-to be attached; The spindle B is splined. into. the. walls .32 for longitudinal reciprocation... without. rotation, and is externally threaded. to receive. a nut 56rotat'able between said'walls, there being shown a thrust-bearing 53. interposedbetween. the nut andthe upper walljlOn. its peripherythe nut has the teeth of aspiralpinion, withfwhich meshes a spiral pin ion'lfiiiliixedvtothe shaft .46. Thelatter pinion meshes with a spiral gear GZ'fast upon the for.- wardextremity of a horizontal shaftfi i rotatable in, the. traveler 42 "and extending rearwardly through abearingfid depending from thewall.

28.1" Athrust-bearing 58 is shown as interposed between the. shaft and the-rear wall. of the traveler. Splinedupon the rear of the shaft, between the bearing. 66 and the wall 16, is a pinion Which" is driven through. a train of gearing rotatable upon the wall It." This train. includes successively ;(Figs. 3 and/l) a gear. 12,

a "pinioni'l iturning with the gear, and gearsegm'ents leand' l8"rotatable'together, the last of these meshing, witha vertical rack Bll'iguided to recip'rocate at one side of the column In? The means for actuating this rack, to rotate the nut 56 and thereby reciprocate the spindle 50, will be described in connection with the related operatien of the side abutments S.

Each of the abutment devices S has a spindle 32 guided in one of the pairs of support-arms 24, it, so it may bemoved longitudinally in a downwardly= andiinwardly inclined direction toward the heel'h 'upon the jacked shoe is. Upon the lower end of each spindle is pivoted at 8 a heelengaging abutment member 85, provided with a .1 yieldabl'e covering or pad 88. A leaf-spring 89, secured to the spindle and bearing against the member, holds thislin, so it may adapt itself yieldingly to the curvature of the particular heel being operated upon. The form of the member 86 and the yieldabilit'y of its padding allow it to extendsomewhat over the rear of the heel (Fig. 7) so it may not only prevent rearward displacement but also may .apply'some forward pressure during the 'descent'pf the abutment; devices.

Each spindle 82"issplin'ed into its 'guidingpair of "arnis"2-ii"and"has formedupon it an external threadre'ceived'iin a nut 90 'seated'between the arms: Bearings Sta-bout the spindles may receive the upward'thrust ofthe nuts. imilarly to the nut 56 of the tread-abutment device, each of th'e'nutsfiii has external spiral gear-teeth, with which meshes'a spiral pinion 92isecured to a short shaft 94 (Fig.6) journaledin a portion of one of the Wall-extensions 22, Fixed tov the end of each.shaft 'dpppositethe spiral pinion is a bevelpinion Q5, meshing with. a bevel-gear 98 fixed to .a short shaft' ififljournaled in the wall'lii'and attached to its rear extremity a pinion i522; The gear"98 "is common to both abutment devices S, S. The pinion 4921s rotated through a seriesofgears comprising a gear 564' (Figs. 6 and -5)' having turning with it a pinion [66, meshingwithia gear-segment lll8with which turns a gear-segment llllf'meshing with a vertical reciprocatory rack IIZ'Lguided'in the columnill at thesideopposite the rackVBU'. By its movement, theJra'ck l i2'rotates the nuts 90 and reciprocates the spindles 82;

Means is provided. to draw. down successively, through the interposed gearing just described, the racks llzand'silto first brin abutment devices S, Sinto engagement with the sides and rear of tiothe'heeluponthe heel-seat of the. jacked shoe,

and then the abutmentT against the. tread-sur face. of said heel.. In thecolumn below the racks is guidedalslide lid/which may be lowered throughalink. Hit uporrthe depressionof the filf'customary. treadle, this being held normally raised by its spring- Thetreadle and-spring are not illustrated... Atthe top. of the slide is fulcrumed anequal-arm lever. I l8 (Fig.- 3 the opposite extremities. of which are joined to theracks-by links i2 E}, .-l2!. Movab1e through the side rack 81) is a locking. plunger 1 22; urged in by an expansionspring l24-so its outer end tends to bewithdrawn from. a-contact.-lever l28-- fulcrumed upon the column.v The-upper contacteend of the lever is held yieldably toward the latch by an expansionspring I28, itsnormal position-beingadjustably determined bya rod 1 36 pivoted to it and threaded to .receive .a =nut.- l 32-.contacting with the outside of the-column. When the heel-abutments, are 7 raised.from the workto-theirinactive positions theparts are as shown in Fig.3. The plunger l22'1'is held'out, acting against the. force of the spring 1 2B -andwith itslend above that of the-lever .l26',-by acontrollirigslide [311 guidedto shift .horizontallyin a hired portion I36 of the wall I6. The

slide I34 has at its opposite ends depending arms I38, I40. The arm I38 initially, with the slide II4 raised, received the contact, near its lower extremity, of a roll I42 rotatable upon the inner end of the plunger I22. The opposite arm I40 is thrust, by the action of the plunger-spring I 24, against a roll I44 rotatable upon the rack H2 at a higher level than the roll I42. With the elements thus related, upon depression of the slide II4 by the link II6, the tread-rack 80 is locked against downward movement by the engagement of the plunger with the end of the lever I26, while the side rack H2 is free to move. Consequently, the left-hand end of the lever II8 (Fig. 3) temporarily becomes the fulcrum, and the opposite end of the lever is lowered and draws down the rack II2. Through the interposed gearing, the nuts 90, 90 are rotated and the spindles 82, 82 depressed to carry the abutment- members 86, 86 toward the opposite sides and rear of the heel. When these abutment-members have reached points at or in proximity to theheel, the rack I I2, and therefore the roll I44, will have been so lowered that the roll leaves the arm I40 of the lock-controlling slide I34 (Fig. 8). This is thereby freed for movement to the right, produced by theplunger-spring I24, which at the same time removes the end of the plunger from the contact-lever I26. Now the tread-rack 80 is released, and continued depression of the slide II4 lowers this rack (Fig. 9), and, through the interposed gearing, rotates the nut 56 to carry down the spindle 50 so its surface 54 engages the treadsurface of the heel. With all the heel-abutments thus made effective, their clamping force is balanced through the lever II8 for whatever further pressure may be applied to the treadle. They will, therefore, act uniformly to retain the heel on the heel-seat of the jacked shoe against the displacing effect of nail-insertion by the drivers I4. On account of the angles of the threads on the spindles and their actuating nuts, this driving force cannot cause the spindles to rotate the nuts and all three abutments are locked in engagement with the heel. Consequently, the force cannot be transmitted back through the treadle to the foot of the operator and no other lock for the holddown is required. When the treadle is re-- leased by the operator and its spring lifts the slide II4, both racks are raised by the links I20;

The roll I44 on the rack II2 first reaches an inclined end-surface I 46 on the slide-arm I40, shifting the slide I34 to the left and holding it by contact with the vertical outer surface of the arm I40. When the roll I42 of the plunger I22 arrives at the inclined end I46 of the opposite slidearm I38, the plunger is forced out, the spring I24 being compressed, and is retained by the outer vertical surface of the arm. The outer end of the plunger travels briefly along the inner side of the lever I26, the spring I28 yielding. Finally, the end of the plunger reaches a level above the end of the lever and the spring I28 urges this" into its rack-retaining position (Fig. 3). During the ascent of the slide H4 and the racks 80 and I I 2, the nuts 56 and 90 were being rotated through the gearing to raise the spindles 50 and 82 simultaneously, the elements thereby being restored to their normal relation.

In the use of a healing machine having the holddown of this invention, the operator, by turning the hand-wheel 48, may adjust the angle of the tread-abutment-spindle 50 so it is normal to the tread-surface of the line of heels to be operated upon. He delivers aload of nails N to seat in approximately the correct position. The

side abutments S, S and the tread-abutment T are at this time fully raised and substantially removed from the work to give ample room for the free introduction of the heel between them and its. arrangement upon the heel-seat. With the heel still held by the operator, the treadle is depressed, so the link II6 draws down the slide I I 4, the actuating rack for the tread-abutment device T being locked to the column I0 by the plunger I22 and contact-lever I26. The lever IIB upon the slide fulcrums upon the link I20 of the rack 80, causing the opposite link to draw down the rack II2 associated with the side abutments, and the lowering of their threaded spindles 82 by rotation of the nuts geared to the rack. The tread-abutment remains at rest. As the side members 88 approach the heel, moving inwardly at the same rate, they position it transversely of the heel-seat. At the same time, the curved portions of the members may thrust it forward sufficiently to insure that the breast-edge is seated against the breast-cut in the sole of the shoe. During this action of the side abutments, the tread-abutment will remain raised and at rest, so the operator may, without interference, retain his grasp upon the heel until it has been fully centered. The roll I44 upon the rack I I2 will now have permitted the controlling slide I34 to release the rack 88 from the plunger I22, so the lever II8 will draw down said rack 80 and rotate the nut 56 which is geared to it, thereby lowering the threaded tread-spindle 50. When the tread-engaging surface 54 of this spindle contacts with the tread-surface of the heel h, the side abutments will have completed the positioning of the heel, and the tread-abutment will apply thereto clamping pressure in the direction of its longitudinal axis and both hold it back against the rear portions of the side members and clamp it firmly upon the heel-seat of the shoe. The force exerted upon the heel by all the abutment devices will be balanced by the equal-arm-lever I I 8. The magnitudes of the side and tread-clamping forces will be determined by the design of the actuating gearing, the former preferably being the greater. The clutch of the heeler is tripped as usual during final depression of the treadle, to cause the driving from the jack I2 of the heelattaching nails N. After the insertion of the nails, the operator releases the treadle; the slide I I4 is lifted by the treadle-spring; the nuts 90 and 56 are rotated by their gearing reversely to the direction during treadle-depression; and the plunger I22 again locks the tread-rack 80 to the frame. The abutments S, S and T have been withdrawn from the work and the lowered shoe may be removed from the jack. The machine is now ready for the succeeding operation.

It will be seen that the locking of the abutmentmembers is positive and not subject to the variations produced by slipping clutch devices. There is no heavy clamping head to raise, and all the play in the mounting of said head is eliminated. The side abutments, acting upon the heel before the tread-abutment, centralize the heel more accurately than does the usual rear fork and carry it against the breast-cut of the shoe-sole. Further, by their location and direction of applied pressure, they tend to resist the lateral splitting of the heels. The tread-abutment exerts its force in a direction normal to the tread-surfaces of heels of all forms, to apply the clamping force to ammeso:

Zr? thebest advantagez This tread v abutment when raised is high enough iabove' thei shoaonl the: jack: to give the operatorg -a'mple '-room -to-1manipu1ate.- and inspect the worlr; l

Having thus l described: my invention; what" I claim "as new and desireto securebylaetters Pat ent of the Unlted statesdsz:

1; In combination; a 4 frame:including:v a-fixed outwardly extending aimQa-work-supporti carriedby-the frame beneath the arm, threeiworkclamping devices movable; upon thearm downwardly and :inwardly toward the work-suppormi: a portion of said devices being guided afor' move-e ment directlyin' the fixed arm,: andflmeans. for moving" the devices into clamping engagement: withwork on the support;

2. Iii-combination, aframe including a fixed outwardly extendin arm; a work-support -carriedby the frame beneath 1 the arm; there being formed-in thearm ateacli side a downwardly and inwardly inc-lined -guide,- a-front guide mov able-upon the arm, means arrangedto-change the inclination of the front guide and to retain it aga-inst movement, three work-(flamping-devi'ces'movable in-the guides toward and fromthework-support, and means'for moving the devices: into clamping engagementwith work on'the support.

3. m combination, a frame including a fixed: outwardly extending arm with spaced side walls and a forwardextension-fromsaidwalls', there being downwardly and-inwardly inclined guidesin'the' side-walls and-a downwardly and outwardly=curved guideway-in the extension, a worksupportcarried-by theframe beneath the arm, work clamping devices movable insaid guides toward and from the work-support, a support movablein the extension-guid'eway, means ar-- rangedtomove-said"support along the guideway,- a work-clamping devicemovablein the guide way support, andmea-ns for 'm'ovin'g thedevices intoclamping'engagement with work on thesup-- port;

4;'In combination; a framedncluding a fixed outwardly extending "arm' with l spaced sidewalls and a forward extension from 'said' walls,- therebeing downwardly and inwardly inclined" guidesin the side walls and a doWnwardlyand"out=- ward'ly curved guideway'in' the extension, a'workr support carried bythe frame beneath the" arm; work-clamping devicesmovable in'said guides toward" and from'the'. work=support a support movable'in the ext'ension guideway, a member movable upon the frame anden'gagingflthe' supe. port to move it' in'the guideway,',means arranged to move the member, a work-clamping device movable in the guideway-support, and means for movingthe devicesinto clampingueng'agement with'workon the support.

5. In combination, a frame, an .arm extending outwardly therefrom, a work-supportbeneath the arm,.-threaded.spindles guided at opposite sides of the arm and'at the -front,.they beingv provicled--with work-engaging portions, nutsupon the spindle-threads: androtatable upon. the. arm, and means for rotating-the nuts and thereby ao= tuating the spindles.

6. inzcombination; a frame,an-arm extending i and geari'ng connecting the:actuatingmember'to all the nuts'atoizeffecttheir rotation".

gearingrconnected to the I slide and having elements meshing with-the teeth upon thenuts."

8. 111 combination, a frame, art arm extending outwardly- :therefrom, a work-support beneath the arm: threadedvspindles i guided at opposite sides of th'e arm and at the front, theybeing pro-: vid'edwith work-engaging portions, 'nuts upon the spindle-threads and rotatable upon the arm, an actuatingmemb'er 'movable upon the'frame,

: andigearing connecting the actuating member to' a'll the nuts to effect their rotation, anelement of= the=gearing being common to the nuts of both 1 side spindles? 9; In" co-mbination, a-framegan arm extending outwardly 11 therefrom; a work support beneath the 'arm;'threaded' spindles-guided at opposite sides of 'the arm andatthe front, they being pro-- vided with work-engagingportions, nuts upon thespindle-threads and rotatable upon the arm,- azr'actuating member movableupon'the' frame,

and means for-communicating themovement of the actuating member first to theside-spindles and'thento the front spindle.

10; Incombination, a frame, an arm'exten'ding outwardly therefrom, a work-supportbeneath the" arm, threaded spindles guided at opposite sides of'the arm'andat'the front, theybeing pro= vid'ecl with -work-engaging portions, nuts upon the spindle threads, they being rotatable upon the arm'and provided with external gear-teeth, a slide movable uponthe frame, trains of gearing'connected to the slide and having elements meshin'g'withthe' teethupo'n' the nuts, and means forlocking one of' the trains of gearing. and thereby the corresponding spindle.

11. In'combination; a frame, an arm extending outwardly therefrom, a work-support beneath the arm, threaded spindles guided at opposite sides of the arm'and at the front, they being provided with work-engaging portions, nuts upon the spindle-threads, they being rotatable upon the armand: provided with external gear-teeth, a

slide movable uponthe'frame, trains of gearing connected totheslide and having elements meshingvwith' the teeth'upon the nuts, means for lock ing oneof the'trains of gearing and thereby the corresponding spindle, and means controlled by the othertrain of 'gearing for releasing the locking-Jmeans:

12;..The combination'with aWork-support, of

movable-Iwork clamping devices 'co-operatingwith the support, trains of-gearing through which the devices are moved; a movablez actuating outwardlytherefrom; a work-support beneath' 7g;-actuatingmember'for operating the controlling the arm, threaded: spindles guided: :at opposite sides-of: the arm and at the front; they; being pro vided with work-engaging: portions, nuts upon the spindle=threads and rotatablerupon therann;i

member.

13;.The combination with a work-support, of

movable Work-cl amping device's co-op eratin'g with a the support, trains- 0f gearing; each including a an: actuating:;member movable upon the frame; mrack andithroughwhich the devices 'are moveda an actuating slide, a lever fulcrumed upon the slide and connected to the racks, means for looking one of the racks and thereby the'corresponding work-clamping device, a second slide movable in opposite directions between the racks to set and release the locking means, and means associated with the activating slide for operating said second slide, to set said locking means.

14. The combination with a work-support, of movable work-clamping devices co-operating with the support, trains of gearing, each including a rack through which the devices are moved, an actuating slide, a lever fulcrumed upon the slide and connected to the racks of both trains, a plunger by'which one of the racks is locked, and a controlling slide for the plunger movable during movement of the actuating slide in one direction to apply the lock and thereby secure certain of the work clamping devices and movable by the plunger during movement of the actuating slide in the opposite direction to release the lock and thereby said work-clamping devices.

15. The combination with a worksupport, of work-clamping devices co-operating with the support, trains of gearing, each including a rack and through which the devices are moved, an actuating slide, a lever fulcrumed upon the slide and connected to the racks, co-operating looking members for certain of the work-clamping devices, one member being movable upon one of the racks into and out of locking position and the other member being yieldable upon a fixed support, and a controlling member for moving the rack-borne locking member into locking po- :i.

sition during movement of the actuating slide, the other locking member yielding in response to such movement of the rack-borne member.

16. In a heel-attaching machine, the combination with a frame, of a jack carried thereby, said frame having a fixed portion extending above the jack, opposite abutment devices guided for longitudinal movement only in the fixed frame-portion into clamping engagement with the opposite sides of a jacked heel, a guide variable in position upon the fixed frame-portion, an abutment device movable in the variable guide for engagement with the tread-surface of the heel, and means for moving the abutment devices.

17. In a heel-attaching machine, the combina-. tion with a frame, of a jack carried thereby, a threaded spindle guided in the frame at each side of the jack and provided with an abutment for engagement with the side of a heel upon a jacked shoe, a threaded spindle guided upon the frame and provided with an abutment for engagement with the tread-surface of the heel, a nut rotatable in the frame about each spindle, and means for rotating the nuts to reciprocate the abutments into and out of engagement with the heel.

18. In a heel-attaching machine, the combination with a frame, of a jack carried thereby, a threaded spindle guided in the frame at each side of the jack and provided with an abutment for engagement with the side of a heel upon a jacked shoe, a support guided in the frame along a curved path having its center at substantially the heel-seat of the jacked shoe, a threaded spindle guided in the support and provided with an abutment for engagement with the treadsurface of the heel, means arranged to move the support, nuts rotatable about the spindles in the 1f) fratme and support, and means for rotating the nu s. l

19. In a heel-attaching machine, the combination with a frame, of a jack carried thereby, a threaded spindle guided in the frame at each side of the jack and provided with an abutment for engagement with the side of a heel upon a jacked shoe, a support guided in the frame along a curved path having its center at substantially the heel-seat of the jacked shoe, a threaded spindle guided in the support and provided with an abutment for engagement with the tread-surface of the heel, a screw rotatable upon' the frame,' a traveler movable upon the frame, it being threaded upon the screw and engaging the support to shift it along its guide, means arranged to move the support, nuts rotatable about the spindles in the frame and support, and means for rotating the nuts.

20. In a heel-attaching machine, the combination with a frame, of a jack carried thereby, a threaded spindle guided in the frame at each side of the jack and provided with an abutment for engagement with the side of a heel upon a jacked shoe, a support guided in the frame along a curved path having its center at substantially the heel-seat of a jacked shoe, a threaded spindle guided in the support and provided with an abutment for engagement with the tread-surface of the heel, a screw rotatable upon the frame, a traveler movable upon the frame, it being threaded upon the screw and engaging the support to shift it along its guide, nuts rotatable about the spindles in the frame and support, a shaft rotatable in the frame and along which the traveler is movable, gearing connecting the shaft to the nut of the tread-spindle, gearing through which the nuts of the side spindles are rotated, and means for driving the gearing.

21. In a heel-attaching machine, a jack, an abutment device for engagement with the peripheral surface of a heel upon the heel-seat of a jacked shoe, an abutment device for engagement with the tread-surface of the heel, means for first causing movement of the abutment device into engagement with the peripheral heelsurface, then causing movement of the abutment device into engagement with the tread-surface and finally exertin upon the heel a balanced pressure by the abutments, and co-operating threaded members through which the movement of the peripheral and tread-abutment devices is produced.

22. In a heel-attaching machine, a jack, an abutment device for engagement with the peripheral surface of a heel upon the heel-seat of a jacked shoe, an abutment device for engagement with the tread-surface of the heel, gearing through which the peripheral abutment device may be moved, gearing through which the treadabutment device may be moved, a movable member, an equal-arm-lever fulcrumed upon the member and connected at its opposite ends to the gearing for the respective abutments, and means for moving the member and thereby the abutment devices.

23. In a heel-attaching machine, a jack, an abutment device for engagement with the peripheral surface of a heel upon the heel-heat of a jacked shoe, an abutment device for engagement with the tread-surface of the heel, gearing through which the preipheral abutment device may be moved, gearing through which the treadabutment device may be moved, a movable ac-

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