US2332677A - Insertion of fastenings - Google Patents

Description

Oct. 2 6, 1943. STRATTON 2,332,677

.[NSERTION OF FASTENING Filed Oct. 2, 1941 6 Sheets-Sheet l F. STRATTQN INSERTION OF FASTENING Filed 001:. 2, 1941 6 Sheets-Sheet 5 Oct. 26, 1943. F. E. STRATTON 2,332,577

INSERTION 0F FASTENING Filed Oct. 2, 1941 6 Sheets-Sheet 4 Get. :25, 1943. STRATTONV 2,332,677

INSERTION OF FASTENING Filed Oct. 2, 1941 6 Sheets-Sheet 5 Fig.5. 7

Oct. 26, 1943. F. E. STRATTON I INSERTION OF FASTENING Filed Oct. 2, 1941 6 Sheets-Sheet 6 Patented Oct. 26, 1943 UNITED STATES PATENT oFFIcE f,

" INSERTIONQF FASTENINGS Frank E. Strait-ton Beverly, Mass, assignor to v United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey h I f Application October 2, 1941, Serial No. 413 ,329

t v r 62 Claims.

' This invention relates to the insertion of'fastenings for securing together work -pieces, it being particularly adapted-for the attachment of heels to'shoes. One of the well known shoe-heels is by a screw inserted through the heel-seat and into the heel, thisscrew becoming a part of the'completed shoe; Incarryihg'out this procedure, it is customaryyafter' clamping the heel in place upon the shoe, to drill through the heel-seat into the heel, and-then to turn by a screw-driver a screw into th hole thus formed,

methods of attaching said screw-driverbeing rotated througha friction or other device, which will yield upon encountering the resistance produced bythe 00mpletion" of the'insertion and the sinking'of'the screw-head into the insole; The rate of rotation is indeterminate; andthe-eiitent and degree of the advancing pressure applied to the screw driver is dependent upon the judgment of the operator. Such a method is time-consuming]; the depth to which the screw will be inserted-isune certain; excessive rotation may tear out the threadwhich the screw forms in the heel; and the difierencebetween the rate "of advance of the screw-driven and the natural rate- OfytllG screw under the influence ofits thread ma -set up forces tending to ruptur the screw; both by torsion and tension. hnobject of my invention is to reduce'the time and effort required for the insertion of a fastening, and to "effect: such i'nse'rtion without danger of injury to the work.

In the attainment of the above objectQI comaction" is permitted by rotating the screw-driver through clutch-sections, preferably of thejfriction-type, normally separated by an interposed spring and brought into engagement under; the screw-advancing force. I have shown thejshoesupport; as in the form of a tube, adapted to receive apassage in thefcone of a last withinithe shoe, in which tub is a screw-supporting or erigaging tube, a screw-driver being movable in the tubes The second of th tubes ismovable within the first; it holding the longitudinal axis ofthe screw symmetrical with-that of the outerltube, as it carries the point into engagement with the work and then remaining at rest, while a spring through which it is actuated "is"compressed',the screw driver advancing through the tubes to insort the screw. Both the rotation'and advance of the screw drivei' are produced'by the previously mentioned clutch=sections, the driven section being connected to th e screw-driver and also acting upohthe screw-ehgag'ing tube. The/driving sec tionof the clutch is preferably rotatable upon-a plunger engaged by the cam whichcause's the ad'- vance of the screw-driver. A spring interposed between t'he screwgengaging tube and a relatively fixed point holds said tube yieldably inits nor malretracted position, while a springbetwen thef tube and "the driven "clutch-section allows relative movemnt'betwe'en the tube and screwdriver; Thescre'w engaging tube is not only 'ele-'- vated underthe power of thema chine to advance the screw into preliminary engagementwith the work, but may al'so be elevated by the operator,

bine with a'work-support and co-operating screw- V driver of a fastening-inserting? machine, means for both rotating the screw-driver and for advancing it at arate corresponding to the pitch of the attaching screw'to be inserted in the supported work. When the movements of the screwdriver and screw thus coincide, the screw may be caused to enter and seat' itself in the work with-'- out destructive stresses being set up, either in the elements secured or in the screw. By advancing the screw-driver through a predetermined distance, screws of all lengths may be inserted with their heads properly disposed as to the surfaces which they enter. The correct relation between screw-rotation and advance may be obtained by employing gearing for effecting suchrotatio-n and.

a cam for producing the advance. The rotation of the screw-driver may be stopped to allow the bit to seat itself in the slot of the screw-head, after which it is resumed for the full insertion of the"screw. There may thus be prevented the tearing and chipping of the screw-head. This permitting inspection and the removal of chips which may be resting'upon" the end ofl thetube and which w'oulddisturb the alinement' o f the crew.f i

In the machine, there are further combined novel means for" dividing the resistance'of'the work to displacement under the influence of clamping pressure between two supports, one of which is movable by the work and which is locked when. the'supportin'g effect is properlydivided; treadle mechanism for applying the clamping pressure andwhichreduces the effort reguiredby the operator; conv'enientmeans whereby the power-cycleof the machineis' controlled from the treadle mechanism; pressure means for the work movable into and out of operating position to facilitate the application of said workto its support; and clutch 'mechanismby which the pressure means is locked in clamping relation to prevent transmission of the reaction back tothe treadle mechanism and tojthe operators footie In-the accompanying drawings,

Fig. '7, an enlarged detail, in side elevation, of

a portion of the clutch-tripping mechanism} Fig. 8, an enlarged top plan View of a portion of the locking mechanism for the last-supporting means; A

Fig. 9, a sectional detail of-the-locking screw and its more closely associated parts; and

Fig. 10, an enlarged broken side elevation ofthe work. and directly. co-operating elements at the completion. of insertion of a heel-'-attaching-v screw. 7

'An] enclosedbase ll] hassecuredfio'its top. a support. (2, upon which; the column M' is. mounted; In thetop. of this column is threaded an adjusting nut I'E, whichmay' be latched. in position by a. spring-detent. l8 entering. some one. of a-seri'esl of. vertical notches about the-nutv (Fig. 2 5. Seated upon the upper extremity of the nut}, andextendingabove. and downinto the column [4, istheflange- 2111 of" a sleeve or 't'ubelii- (Fig.

I). This: tube is arranged to. serve .as a worksupporting spindle. it being adapted to enter. a passage throughthe cone. of a last contained irra shoe, the: heel of which is to be attached. Movable within the tube 22 is a sleeve or tube 2L; the lower extremity ofiwhichhas a-,.tubul'a'r enlargement 26". Upon. the upper face or the enlargement restsa-balI-bearing .28; supporting. a compression-spring. 3-0- surrounding} the tube 24 and. engagingatitsupper extremity a washer 3'2r which contacts with a surface upon the. interior of the nut l6. Below the enlargement la of. the tube 21 is a collar, surrounding the head 36 of a screw-driver 38. The: shank of screw-driver extends up within the tube 2'4gwith. some clearance. while the: bit 40'lies a t the levelof. or just below, the upper extremity ,ofrthe: tube-,= and isformed upon an enlargement 4i fitting said tubefor rotation therein. The collar-341s carriedupon acompression-springwhich surrounds itandrests; at its lower-end upon theupper section. 46 of a friction -clutch,-

' through which-the: screw-driver is'rotated. The

serew-dri-ver head 36- is: threaded into the hub of this clutch-section, which is surroundedby the collar 34. In the collar. is. a verticalslot, and passing. through the hubof the clutch-section 46 is apim- 48 against; which-thebottomof the slot; is normally held by; the. sprin-g'.- M. The clutch-section 4&- is carried: upon" 'a pi-n 5d normal'ly;- e'levatedby a'comp-ression-spring .52. Thisspri-ng. 1-1651 with-ina bore in a pinion having vertically elongated: teeth Secured to the upper end oi. the pinion is.- the lower sectionifil of the clutchfor. the screw-driver. Meshing, with. the pinion 54 is-a; gear 58 upon theuppen'extremity? oi: vertical counter-shaft 60-.- shafit is rotatedzthrough bravel -gearing? 6'2 from-a shaft 64':- tu-rning horizontally in the support I-2 and actuatedconstantly during the operation of the machine through. a-puilley 66-.v These: connections. rotatetheserlew-drtver 38 upon engagement of the clutch sectionsi 46- and; 5%.. Upon the lower portion of the shaft 60 is a worm. meshing with a worm-wheel 10 upon a. shaft" journaled horizontally in the support. The lastmentioned shaft carries a cam '14, upon which rests a plunger 16 guided for. vertical movement in the support, and upon the upper extremity of which the pinion 54 is rotatable. The wormwheel is free to turn about the shaft 12, but maybe compelled to rotate with said shaft by a single-rotation clutch C, controlled asivill hereinafter appear.

The inserting operation of the screw-driver takes place in the following manner. The opera tor, first dropping 2. screws, head'down, into the tube 2'2 upon theend of the tube 24, applies the xps'S'a'gethrough the cone of a last L within a 1 shoe S'to be heeled to the tube 22. The last-Q ,platejhasz'a i opening of less diameter than the outside diameter of the Itube 22,'it furnishing at Z" a shoulder overhanging the passage and contacting with the upper extremity.of-.-theg said j tube. The initial distance betweenthetube-ends will at least equal the length of .the ,lqngest{screw' to be used. Then a heel H is positionedaupo the heel-seat of theishoe, snappy. treadle anism T, illustratedin 3 andfithe ope rs T 'ator brings down. :u-ponthe work a pressurg head or work-holddown- P'. The treadlermechanisn and pressure he'ad will later be describedin deg tail. When; the clutch ;C istrippeth the the: pinion; 54 and lower clutch-section; 56;.

Through thespring-52- -pin.5&;and-clutch-section p and tube 24 isgresisted. the spring 3l ,yields; the

screw-driver. continues to rise; the spring. 44 compressing, and willwcome intocontact with the head ofthe screw; forcing the poin intoirthe heel-seat of the shoe. The. relative Jongitudihal movement between the screwdriver andthetub'e 24 wilLbepermi-tted bythetravel.ot thejgpin -lfl the slot in the collarilh At-this'ti-me, the combined resistan'ce of the springs 30 and14kwill cause the spring 52 to be compressed. andi'the sections 56 and 46: of the clutch wi-llz come intg driving engagement, turning the screw-drivento find the. slot in the crew-head. Asthe screw-r driver bit comes into zregistrationg -with-Z the slot, it is forced; into saidslotby the exparisiontoflv the spring 52. This allows the' clutch -section' to separate, automatically from-the. companion sec:

' tion, sorotation -of the screw-driver momentarily stops, giving the'bit'an opportunity to fully-seat itself. Then the. continued otationv ofithe c efiects the re-engagement ofthe 'clutchesecj tions. to again turn thescrew-driver to insert. the screw through the'heel-seat into-the heel; "The relation. between" thepredetermined zrate of: elevation of thescrew-driver by-the cam'llandits rotation by the gearing: 54;, 58;: produces a move-1 men-t which corresponds to thepitchofathe screw screw contacts with the resistivematerial of the heel-seat, ittends to be held. back, while-the por-z tion. in the heel continuesitsadVanOeata rate 5' determined byv the pitch of the thread; Before there canibe' applied a dangerous'longitudinal strain resulting, from the delayed-travel ofhthe anus-y starts its rotation andraises thegplungei-JG;with

head, the clutch-sections slip. This is followed immediately bythe applicationof such'a force by the cam that theresi'stan'ce to the head is overcome, and the insertion is completed with the same advancing forces for all portions of the screw, rupturing stresses thus being avoided. The head of the screw will be'driven always into a definite relation to theinsole, as flush with its inner surface, because the travel of the bit 40 of the screw-driver, as produced by the cam, is unvarying. The depth of insertionof the screwhead may be varied by raising and loweringthe outer tube 22, this being effected by rotation of the nut I6 and altering the initial distance between the screw-drivenbit and the end of the tube. The head of the screw, resting upon the inner tube 26 within the outer tube," is held against angular displacement, its axis being tion. When the cam M, at'the endof its rotation upon the opening of the clutch C, releases the plunger 16, the springs 30, 46 and 52 return the elements to normal. 4 I

" In the use of the machine, fragments of leather or metal chips from the screw-heads may fall into the tube 22 and rest upon the end of the inner tube 24 and the bit of the screw-driver. These, engaged by the head of theintroduced screws, would so tilt said screws that they would not enter the work in proper alinement with the screw-driver. I facilitate the removal of obstructions of this character by the provision. of means for raising the inner sleeve and the screwdriver manually. Formed upon the front of the plunger It is a vertical series of rack-teeth 80, with whichmeshes a pinion 82; fast upon a shaft 84, journaled across the front of'the support I2 andto one extremity of which a hand-lever 8B is secured. At any time, the operator may turn down the hand-lever to lift the ends of the tube 24 and the screw-driver to the top of the tube 22 for examination and the removal of chips.

If the work is supported wholly bythe engagemerit of the last-plate-shoulder Z with the end of the spindle or tube 22, the'clamping pressure applied by the head P may deform said last-plate. To avoid this, I distribute the pressure between the last-plate and the crown of the last-cone, an auxiliary work-support being provided for the latter. Fulcrumed at 81 upon the frame is a horizontal lever 88 (Fig. 2). This carries in a socket at its forward extremity a universally tilt-- able supporting member or bed-piece SI! for the crown of the last-cone. Rotatable upon the lever between its fulcrum and the last-becL-piece is a roll 9!, resting upon the upper end of a threaded spindle 92 (Fig. 9), which passes through a nut 94 rotatable in a mounting 96 carried upon the top of the support. 52. The nut may be locked temporarily against rotation by a double detent 98, 938 (Fig. 8) pivoted adjacent to it and urged toward teeth Illil upon the periphery of the nut by scissors-springs m2, Hi2 secured to a horizontal stem Illa projecting from the core I96 of a solenoid Hi8. An eccentric stop I Hi adjustably limits the extent of outward movement of the detents. These detents are normally held away from the nut-teeth by a retaining loop IE2, projecting from the end of the stem Hi l through a guide I I3 carried by said stem, the loop passing vertically at its outer end through openings in the detents. The stem is engaged by the end of a torsion-spring l I l attached to the mounting 96, and which yieldably holds the loop and detents, together with the core I06, as'far to the left as is permitted by the stop III]. The

'detents are thus normally out of engagement with the teeth I06. The winding of the solenoid I08 is in circuit with a switch I09 (Fig. 2), which may be closed upon engagement of the pressurehead P with the work, as hereinafter described. The spindle 92 is elevated, and with it the lever 88 and the last-bed-piece 98 to an extent permitted by a stop-screw H6 threaded through the lever, by an expansion-spring I I 8 which surrounds said spindle between the mounting 9B and a collar I28 adjustable upon the spindle. In this movement, the thread upon the spindle travels through the nut, this turning idly. The normal position of the bed-piece 96 is such that last-cones of all heights'will produce some depression when pressure isapplied to the work; Consequently, the

crown of thela'stgcone will always have a bearing upon the bed-piece. When the pressure-head P causes the closing of the switch I09, the solenoid Ifiiiis energized. This shifts the core I96 and its stem IMto 'the right (Fig. 8), carrying the retaining loop H2 away from the detents 98, so the springs I92 force them into engagement with the teeth Iilfi upon the nut 9d. The nut is thereby locked against rotation, and prevents any further downward movement of the spindle 92. The work is now supported upon the bed-piece as well'as upon the end of the tube 22, so the pressure will be distributed between the two elements. As a result of this, the shoulder l of the last-plate will] not be deformed by pressure upon the tube-end. If the shoulder were omitted and the insole of theshoe allowed to engage the tubeend, indentation of the insole would be avoided by this distribution of'pressure.

Considering how the clamping of the work for the operation upon it, there is guided at the opposite sides'of' the frame vertical side-rods I22, I22 (Fig. 1). These are connected at their upper extremities to a top-girt I24 carrying the pressure-head P and below by a cross-girt I26 (Fig. 4). Fulcrumed at I28 within the base ID is a treadle-lever I it of the mechanism T with its foot-pad I32 held normally raised by a tension-spring I3 3 extending between the top of the base andthe treadle in front ofthe fulcrum and by a weight I36 hung upon arms E38, projecting rearwardly from the fulcrum-rod, and steadied by a link I iil pivotedto the weight and to the base. Fulcrumed at I42 upon the treadle-lever is a lever I4 1, a projection I45 from which rests normally against a cross-rod I 56 upon the treadle; The forward end of the lever I44 is joined-by a link Ml to a lever I48, fulcrumed at I 49 at the front of the base and connected by spaced'links Iiiii, Ifidto the underside of the cross-girt I28. Fulcrumed at Hi2 with the lever I-M is 'a second lever I52, which-at its outer extremity, is held yieldably against the end of the leveiflM by a tension-spring IM- extending between them. The levers 14 i and I52, which may be considered as c1utch-1ever s,'are bowed outwardly to receive the spring. At therear of the fulcrum, the lever l5? has rotatable upon its. roll I56 for actuating clutch mechanism 0. This mechanism has a normally'stationary block 153 pivotedupon the treadle-lever at $68 and adjustable as to itsangle by a screw Hi2, threaded through a portion of the treadle-lever and against hich it is held by a tension-spring Ifi l. Guided upon the stationary block I53 is a movable clutchblock 'IE-B for engagement by the roll I56. Between theblocks I58 and :53 passes a clutclrrod treadle by pressure of his foot upon the pad I32.

The lever I44 transmits the motion through the link I41, lever I48,'links I50, cross-girt I26, siderods I22 and top-girt I24 to the pressure-head, lowering this for the application of preliminary pressure. Because the connection of the lower end of the link I41 to the treadle is, in effect, close to the foot-pad, and that of the-upper end of the link inproximity to the cross-girt, this movement is rapid, being substantially that of the operators foot. When the travel of the pres:

sure-head is arrested by its contact with the work, the movement of the lever I48 will be stopped. The link I4! holds stationary the forward end of the lever I44, but movement of the treadle, continues. 7 I42 and carry the forward end of the lever I52 away from that of the lever I44, the spring I54 yielding. The contraclockwise swing of the lever fulcrum. I42 (Fig. 4) causes the roll I59'and the block I68 to be brought into engagement with a force limited by the spring. This clutches the rod I68 to the treadle-lever, so the final movement of the foot-pad I32 is transmitted through the link I10, spring I12 and lever I48, and then,

as for the preliminary pressure, to the head P.

Because of the ratio between the lever-arms formed between the lever-fulcrum I28 and the rod I68 and between said fulcrum and foot-pad I32, and, further, because of a similar ratio between the lever-fulcrum I49 and the connection of the links I50 andbetween this fulcrum and the link I10, the force applied by the operator will be twice multiplied. With this final clamping pressure, little effort is required to hold the work firmly in place upon the tube 22 and bedpiece 90, to resist the displacing effect produced by the insertion of a screw. However, on account of the interposition of the loaded spring I12, th holddown-pressure will be limited to that which will compress said spring, and crushing of the heel may thus be avoided.

- The pressure-head P has a slide I80 (Fig. 2) movable upon the top-girt in horizontal ways I8I (Fig. 1) forwardly and rearwardly, the former position being determined by a stop-screw I82 threaded through the front of the head. The heel-engaging members consist of the usual tread-abutment I84 and rear abutment or fork I86, the tread-engaging surface being adjustable as to angle by a screw I88, while the angle of the fork may be varied by a screw I90. Depending from the rear of the top-girt are arms I92, I92 between which is fulcrumed a bell-cranklever havin three arms I94, I96 and I98. The arm I94 is joined to the slide I80 by a link 200. To the arm I96 a tension-spring 202 is connected, the opposite end being attached to the top-girt and serving to draw the slide forward. Through the third arm I98 a rod 204 passes, this at its lower end being attached at 206 to the top of the base I0. Above the last-mentioned arm, a collar 208 is fixedto the rod. When the topgirt is elevated in its normal position, which may be effected by the spring I34 and the weight I36 acting upon the treadle-lever I30, the arm I98 This will lower the fulcrum Y :of the bell-crank-lever comes into contact with the collar. This draws the slide J back against .the tension of the spring 202, and leaves the tube 22 clear for the application of the work. When the operator treadles and draws down the topegirt I24, the lever-arm I98 travels away from the collar. The tread and rear abutment members of the head, under the influence of the spring 202, approach in an inclined direction theheel which has been applied to the heel-seat. ofj'the lasted shoe upon the sleeve and settle into -lene gagement with it.

The action of the tread-abutment I 84 and the rear. fork I86, occurring whenthey first contact withthe heel, is utilized to effect the closure of the switch I 09, thus lockingthe nut 94 of the last-supporting lever 88 against rotation. When the pressure-head P is lowered, the tread-abutment and fork engage the work, the intermediate pinion 2I4per-mitting their effect to be equalized.

With both the tread-abutment and the fork thus bearing upon the work ready for the initiation of final pressure, and the force exerted through the treadle continuing, I have provided for rela- 4 tive movement of the slide I80 and {the heel-en the racks 2I0 and 2I6, and thereforethe pinion 214 and its spindle, are held against any sub stantial movement, but the slide I80 continues to descend under the influence of the treadle. This lowers the fulcrum 22I of the lever 222, w hile'the;

forward portion of the lever is held against movement by the stationary spindle. The result .of this is to depress the end 226 of thelever, turning it suificientlyclockwise (Fig. 2) to actuate the switch-button. This closes the circuit' -through the solenoid I08, advancing the loop II2 so the detents 98 are freed to be forced by their springs I 02 into engagement with the teethxupon the nut 94. This locks the spindle 92 against movement, so the forward end of the lever 88, with thelasthead P resumes its raised position, the lever 222 turns contraclockwise, freeing the button of the switch I09 to open the circuit ofthe solenoid.

The loop H2 is thereupon drawn back by thc spring II4, removing the detents from the teeth of the nut. This releases the spindle 92, which is elevated by the spring II8, restoring the lever 88 and the last-bed-piece 90 to their normal positions.

When the heels being operated upon are of they Cuban type, orv others having comparatively straight backs, it is a common practice with compensating holddowns, such as .that' herein illustrated, to lock the front rack-bar 2 I0 to the slide I80 by inserting a pin 229 through alined openings 239 in the side walls of the slide and in a depression 232 in the bar. Theopenings and depression are so related that with the pin in place, the tread-abutment is held doWn-andt-he rear fork raised clear of theheel, the entire clamping pressure being applied by the former. Obviously, when thus arranged, the depression of the holddown would not turn the lever 222 to actuate the button of the switch I09. To provide for locking the lever 88 under such conditions, I vertically elongate the openings 238, the rack-depression 232 being as usual. There is thus a capacity for limited relative movement between the locking pin 229 and'the slide. At 234 the lever 222 is extended forwardly and downwardly, so its end lies just above the locking pin 229, when this is inserted through the openings and depression. With the pin in place, the bottom of the elongated openings 23d will be initially in contact with said pin and the end 234 of the lever separated from it. When in the lowering of the pressure-head the tread-abutment is stopped by contact with the heel, movement of the openings in the further descent of the slide I80 is suificient to carry the lever-end The clutch C, through which the screw-driver 38 is elevated, is preferably tripped as an incident to the depression of the treadle-lever I38,"it occurring just as the foot-pad I32 is approaching its lowest point, so substantially full clamping pressure is upon the'work. At I 48 there is pivoted'to' the treadle a rod 242 (Fig. 4), which at its upper extremity has threaded upon it an adjustable collar 244 (Figs. 2 and 7). The collar normally lies above and is spaced from a pin 2&3 projecting from one side of a lever 248 fixed to a fulcrum-spindle 25H rotatable transversely of thesupport I2. the lever 248 is a link 252, which, when lifted against the force of a spring within the clutch mechanism, frees said mechanism for a single rotation. Therod 242 passes through an opening in a plate 254 and in a link 258, to the upper edge of which the plate is attached. Said link extends horizontally from its pivotal connection to a depending arm 258 of the lever 248, it then i ably toward the frontof the machine yf tension-springs 268, 288joining the crossbar to the plate. J i

When the operator treadles," the rod 242 is drawn down and, as the food-pad I 32 approaches its lowest extreme of movement, the collar 244 is carried'by the rod from the; position indicated in full-lines in Fig. '7 to the dash-line-position.

The under surface of the collar striking the pin 246 tilts the lever 248. This lifts the link 252 suificiently to-trip the clutch C, starting the operation of the screw-driver 38. The link-252 must be released promptly to permit the disengagementof the clutch at the termination of the operating cycle. This is effected by the 111111256.

As the plunger" 16 elevates the screw-driver, therack 80 and pinion 82 turnthe crank-pin 268 clockwise (Fig. 7.). The forward edge of the opening through the link and its plate swings the rod 242 to the right, removing the collar 244 from above the pin,248. This releases the lever 248; so'the link 252 is 'depressed to cause the Depending from the rear ofstopped in its normal position. When the lever 248 is, freed from the collar and'turns contraclockwise, the periphery of the collar will rest against the pin. As the rotation of the crankpin returns the link to its initial position, jammingof the'collar against the pin is avoided by the 'yield of the'bar 262 against the tension of the springs 266. When the operator releases theqtreadle, the rod 242 rises, the collar leaving the pin and resuming-its normal position. I

The work having been clamped and the clutch C engaged as just described, transmission of the screw-inserting force back to thetreadle mechanism T is prevented by the following means. Referring'to Figs. 1,2, 5 and 6, each} of the side-rods I22 has associated with it a Clutch 0 of the Horton-type. Each side-rod passes throughfla cage at 210, in which a roll 212 is interposed between a fixed inclined surface 214 and a vertical wear-plate 276 upon the adjacentface of thesiderod. Th roll is urged upwardly to produce the gripping eifect by spring-plungers 2l8,j 218," and may be depressed and normally retained by a plunger'280 bearing upon its upper side. Above the upper extremity of each plunger 280 extends an arm 282 fast upon a shaft 284 rotatable in the support I2. The shaft has secured upon 'it an intermediate arm 288, which lies belowa caming the tripping of'theclutchgc, the cam-pro jection 288 leaves the arm 286.

282, permits the plungers 218' to raise the roll into clutching engagement with its side-rod. The

pressure-head is thus temporarily secured against retraction, regardless of the inserting force exerted upon the screw and without requiring effort on the part of the operator.

"In the use of the machine of this invention, the operator places'a screws; headdown, within the outer tube 22 upon the enact the tube'24,

and spindles alwted shoe S with 'the'last-platei shoulder Z restingupon the end of the outer'tube,

locates 'a'heel H upon the heel-seat and depresses the treadle 138. Throughthe chain 'ofconnec-f tions, including the link 'I4T,,the.top-girt I24 carrying the pressure-head P israpidly lowered.

88 and lowered this, and, as the'two abutmentmembers are stopped in their descent by the heel, the floating pinion 2I4 transmits further downward movementof the slide I89 to the lever, 222. The resulting oscillation ofthis lever closesthe circuit of the solenoid I88 at the switch I I19, jtol lock the nut 94 against rotation about the spindle: 92, preventing further depression of the last-bed-j piece. Pressure applied to the work will now be distributed between the last-plate andthelastcone. As depressionof the treadle by the ope'rclutch to be disengaged and the screw-driver- This, freeing the plunger 288 of each clutch c from the arm tubes at a rate corresponding to the pitch of the screw engaged.

13. The combination with a tube adapted to receive a passage in the cone of a last, the outside diameter of said tube being greater than that of the passage-opening through the heel-seat-portion of the last, of a tube situated within the first tube for engagement with the head of a screw, and a screw-driver movable in the screw-engaging tube.

14. The, combination with a tube adapted to receive a passage in the cone of a last, of a tube situated within the first tube for engagement with the head of a screw, a screw-driver rotatable in the screw-engaging tube, and means for advancing the screw-engaging tube and the screw-driver together and for permitting the tube to remain at rest while the advance of the screwdriver continues.

'15. The combination with a tube adapted to support a lasted shoe, of a screw-supporting tube movable within the last-supporting tube, means for moving the screw-supporting tube toward the work, means for yieldably retracting the screwsupporting tube, and a screw-driver movable within the screw-supporting tube.

16. The combination with a tube adapted to support a lasted shoe, of a screw-supporting tube movable within the last-supportingtube, means for moving the screw-supporting tube toward the work, means for yieldably retracting the screwsupporting tube, a screw-driver movable within the screw-supporting tube, and means for moving the screw-driver yieldably.

1'7. The combination with a tube adapted to V support a lasted shoe, of a reciprocatory screwsupporting tube within the last-supporting tube, a reciprocatory screw-driver within" the screwsupporting tube, means through which the screwsupporting tube and the screw-driver are advanced toward the work, a spring interposed between the screw-supporting tube and a relatively fixed point, and a spring interposed between the screw-driver and the advancing means.

18. The combination with aframe member, of a tube rising therefrom and adapted to receive a passage within the cone of a last, a screwsupporting tube movable within the last-receivingtube, a screw-driver movable within the screwsupporting tube, a driven clutch-section secured to the screw-driver and acting upon the screwsupporting tube, a driving clutch-section cooperating with the driven section and movable in the frame, and means for rotating and recipe meeting the driving clutch-section.

19. The combination with a frame membenof a tube rising therefrom and adapted to receive.

a passage Within the cone of a last, a screwsupporting tube movable Within the last-receiving tube, a screw-driver movable within the screwsupportingtube, a driven clutch-section secured to the screw-driver and acting upon the screwsupporting tube, a driving clutch-section 00-.

operating with the driven section and movable in theframe, means for rotating and reciprocating the driving clutch-section, and a spring movable with the driving, clutch-section and by which the driven clutch-section is supported.

29. The combination with a frame member, of a, tube rising therefrom and adapted to receive a passage within the cone of a last, a screw supporting tube movable within the last-receiving tube, a screw-driver movable within the screwsupporting tube, a drivenclutch-section secured to the screw-driver and acting upon the screwsupporting tube, a driving clutch-section co-- operating with the driven section and movable in the frame, means for rotating and reciprocating the driving clutch-section, a spring movable with the driving clutch-section I and by which the driven clutchesection is supported, and springs, interposed between the driven clutch-section and the screw-supporting tube and between the screw-supporting tube and the frame.

21. In a fastening-inserting machine, a rotatable cam, a plunger engaged by the cam, a clutch-section rotatable upon the plunger, gearing by which the clutch-section is rotated, a spring carried by the clutch-section, a second clutch-section resting upon the spring, av screwdriver secured to the second clutch-section, and a tube within which the screw-driver is movable.

22. Ina fastening-inserting machine, a rotatable cam, a plunger engaged by the cam, a clutch-section rotatable upon the plungengearing by which the clutch-section is rotated, a: spring carried by the clutch-section, a second clutch-section resting upon the spring, a screwdriver secured to the second clutch-section, and

a tube within which the screw-driver is movable and arranged to receive a passage in the cone of a last.

23. In a fastening-inserting machine, a rotat-e able cam, a plunger engaged by the cam, a clutch-section rotatable upon the plunger, gearing by which the clutch-section is rotated, a spring carried by the clutch-section, a second clutch-section resting upon the spring, a screw driver secured to the second clutch-section, a screw-supporting tube surrounding the screwdriver and yieldable upon the second clutchsection, and a normally fixed tube surrounding the screw-supporting tube and adapted to receive a passage in the cone of a last.

24. In a fastening-inserting machine, a rotat able cam, a plunger engaged by the cam, a

clutch-section rotatable upon the plunger, gearing by which the clutch-section is rotated, a spring carried by the clutch-section, a second clutch-section resting upon the spring, a screwdriver secured to the second clutch-section, a screw-supporting tube surrounding the screwdriver upon the second clutch-section, a spring acting to lower the screw-supporting tube, a spring permitting relative movement between the screw-supporting tube and the screw-driver, and a normally fixed tube surrounding the screwsupporting tube and adapted to receive a passage in the cone of a last.

25. In a heel-attaching machine, a frame, a. nut threaded upon the frame, a tube supported by the nut and adapted to receive a passage in a last-cone, a screw-supporting tube movable in the last-receiving tube, and a screwdriver movable in the screw-supporting tube.

26. In a heel-attaching machine, a tube adapted to receive a passage in a last-cone, a

screw-supporting tube reciprocable in the last-.

receiving tube, a screw-driver movable in the screw-supporting tube, means for elevating the screw-supporting tube under the power of the machine, and means arranged for actuation by the operator to elevate such tube.

27. In a fastening-inserting machine, a rotatable cam, a plunger engaged by the cam, a tubeadapted to receive a passage in a last-cone, a screw-supporting tube reciprocable in the lastreceivingtube, a screw-driver movable in the screw-supporting tube, said screw-driver and screw-supporting tube being carried bythe plunger, and means arranged for actuation by the operator to reciprocate the plunger.

28. In combination, a plurality of supports for a lasted shoe, one of said supports being movable by the work, means for applying pressure to the supported work, and means controlled by the pressure-applying means for locking the movable support. a

29. In combination, a plurality of supportsfor a lasted shoe, one of said supports being movable by the work, means for applying pressure to the supported work, and means controlled by the pressure-applying means and including electromagnetic mechanism for locking the. movable support.

30. In combination, a plurality of supports for a lasted shoe, one of said supports being movable by the work, means for applying preliminaryand final pressure to the work, and means made eiTective upon the initiation of final pressure for looking the movable support.

31. In combination, a plurality of supportsfor a lasted shoe, one of said supports being movable by the work, mechanism through which pressure is applied to the supported work, said pressureapplying mechanism having relatively movable members, and means controlled by the relative movement of the members for locking the movable support.

32. In a heel-attaching machine, a plurality of supports for a shoe and heel, one of which supports is movable, means forlocking the movable support, a pressure-head, two members relatively movable on the head for engagement with the-heel, and means made efiective upon the relative movement of the heel-engaging members for controlling. the locking means.

33. In a heel-attaching machine,a plurality of supports for a shoe and heel, one of which supports is movable, means for locking the movable support, a pressure-head, two racks carried by the pressure-head, a heel-engaging member mounted upon each rack, a. pinion connecting the racks, the pressure-head and pinion being relatively movable upon the application of-pres-z bers with the heel, a lever iulcrumed upon the head and contacting with the spindle, and'me'ans actuated by thelever for controlling the locking means.

35. In-a heel-attaching machine, a plurality'of supports for a shoe and heel, one of which supports is movable, means for locking the movable support, a pressure-head, two racks movable inthe pressure head, a heel-engaging member mounted upon each rack, apinion connecting: the racks for movement together and having' a spindle, the pressure-head and spindle being relatively movable upon engagement'of the members with the heel, a member co-operatin'gwith the pressure-head and with one of the racks'to limit the relative movement, a lever fulcru'med upon the head and contacting with=the move 'tion of the detent, and

sesame ment limiting member, and means actuatedthe lever for controlling the locking means.

36. In combination,- a-plura-lity of last-engaging members, one of whichis movable, a screw and co-operati-ng'-nutwhichare relatively movable and one of which furnishes a support for the movable ast-engaging member, and m ans for producing the relative movement or the'- screw and nut and for iock-irig-tnemagainst sucnmove= ment.

' 3'1". In combination, aspindl arranged to receive a passage in a last-cone, a relatively-mow able screw and nut, one of which is movable under the influence of the last, andmeans for locking the screw and nut against relative move-- ment.

38. In combination, a spindle arranged to receive a passage in a last-cone, arelatively movable screw and nut, oneof which. is movable under the influence otthelast, andico-operating teeth and a detent for locking the screw and nut against relative movement 39. In combination, a: plurality of supports for a lasted shoe, one of said supports being movable by the work, a. screw 'm'ovable' by the mov able support, a nut surrounding the screw and retained against bodily movement, said nut'being provided with teeth, a detent for engagement with the teeth, and means for causing such engagement of the detent.

40. In combination, a plurality of supports for a lasted shoe, one of said supports-being movable by the work, a screw movable by themovable support, a nut surroundingthe screw and re'-.

I tained against bodily movement, saidnut being provided with teeth, a'detent for engagement with the teeth, and electromagnetic mechanism for causing su'oh engagementof-the detent.

41. In combination a plurality of supports for.

a lasted shoe, one of-saidsupports being movable by the work, means-for applying pressure to the supported work, a contact-device actuated by the} pressure means, and electromagnetic mechanism controlled bythe contactdevice for locking the movable support.

' teeth, a dete'nt fo'r ene'age'mentwith the, teeth,

a solenoidhaving'aplunger' controlling theposi means: for energizing the; solenoid.

44. In combination, a support movable by con-i tact with a last, mechanism for applying pres sure to the lasted work, a screw movable by the support, a nut rotatable; by the screw and re tamed against. bodily movement, said nut being provided with teeth,;a.detent..for engagement with the teethya solenoid'having a plunger'c i teeth, and: meansrforcontrolling such en age! ment. M;

46. In a heelrattaching;machine; a: spindle .for supporting." a lasted. shoe; 1 a lever P having-means for; engaging. the crown of the-llast-cone and depressible thereby, means for urging -theeenga r ing means along the. spindle to receive-such en-: gagement, a screw/connected to the: lever, .ainut engaging the screw; and retained against bodily movement, said nut having teeth-,a detentfor enga ement with the teeth,.andmeans for controlling such engagement.

47. In a fastening-inserting;machine, aframe, a work-.supportmounted-thereon;arpressure-head movable toward andifrom the support, a-treadlea lever fulcrumedwupon'. the frame,',a.-.-secondlever fulcrumed upon the: fram and: connected to the pressure-head, clutch mechanismcarried'. by; the treadle-lever, clutch-levers fulcrumed uponsthe treadle-lever, a link connecting. the secondlever and the clutch-levers," and .-a= link .connec-tedpto' the second lever and arranged for engagement by the clutch mechanism.

48. In a fastening-inserting machine, a frame, a work-support mounted thereon, a pressurehead movable toward and from the support, a treadle-lever fulcrumed upon the frame, a second lever fulcrumed upon the frame and connected to the pressure-head, clutch mechanism carried by the treadle-lever, clutch-levers fulcrumed upon the treadle-lever, a link connecting-the second lever and the clutch-levers, and a link connected to the second lever and arranged for engagement by the clutch mechanism, the leverag upon the pressure-head produced by the clutch-engaged link through the second lever being greater than that of the link joining said second lever to the clutch-levers.

49. In a fastening-inserting machine, a frame, a work-support mounted thereon, a pressure-head movable toward and from the support, a treadlelever fulcrumed upon the frame, a second lever fulcrumed upon the frame and connected to the pressure-head, clutch mechanism carried by the treadle-lever, clutch-levers fulcrumed upon the treadle-lever, a link connecting the second lever and the clutch-levers, a link connected to the second lever and arranged for engagement by the clutch mechanism, the leverage upon the pressure-head produced by the clutch-engaged link through the second lever being greater than that of the link joining said second lever to the clutchlevers, and a spring included in the clutch-engaged link.

50. In a fastening-inserting machine, a worksupport, a pressure-head movable toward and from the support, a heel-engaging member movable upon the head, a lever connected to the heelengaging member, and a member fixed relatively to the lever and into and out of active engagement with which said lever moves.

51. In a fastening-inserting machine, a frame, a work-support mounted upon the frame, a pressure-head movable upon the frame toward and from the support, a slide movable upon the head, a lever fulcrumed upon the head and connected to the slide, and a'rod attached to the frame and I travel. of the.-=head.

53. In. a fastening-inser.ting:,machine,: swam. supportt a =movable-tool..-for..operating upon..the supportedi work, a. clutch throughwhichthe tool is moved, a lever, a clutch-controlling member. carried .by the .lever,; atreadle,...arod. movable by,- the. treadletinton engagement WitliihflulVBl. to actuate the clutchecontrolling;member, and means. actingsuponbthelrod to. release-the. lever therefrom.. I

54. In a.iasteningeinsertinggmachine,.a work; support,...a .reciprocable' tool for operationnpon the supported .work'; aimember 1by....wl 1ich thetool isreciprocati.aJclutchTthrough whichithe memberv is reciprocatedg. a. lever,.,a... clutch; controlling membercarried by the lever atreadle,axedhiovable byi the treadle-.intoengagementlwiththie' lever to actuate...theclutchcontrollihg,member,

and means movableby the toolreciprocati'ng,

member in engagement withth'e rod to release the lever therefrom.

55. In a fastening-inserting machine, a worksupport, a movable tool for operating upon the supported work, a clutch through which the tool is moved, a lever, a clutch-controlling member carried by the lever, a treadle, a rod movable by the treadle into engagement with the lever to actuate the clutch-controlling member, and means having a yieldable portion engaging the rod to release the lever therefrom.

56. In a fastening-inserting machine, a worksupport, a reciprocable tool for operating upon the supported work, a plunger by which the tool is reciprocated, a shaft geared to the plunger and having a crankpin, a clutch through which the plunger is reciprocated, a lever, a clutchcontrolling member carried by the lever, a treadle, a rod movable by the treadle into engagement with the lever to actuate the clutchcontrolling member, and a link connected to the crankpin and acting upon the rod to release the lever therefrom.

57. In a fastening-inserting machine, a. worksupport, a reciprocable tool for operating upon the supported work, a plunger by which the tool is reciprocated, a shaft geared to the plunger and having a crankpin, a clutch through which the plunger is reciprocated, a lever, a clutch-controlling member carried by the lever, a treadle, a rod movable by the treaclle into engagement with the lever to actuate the clutch-controlling member, a link connected to the crankpin, and a member yieldable upon the link for engaging the rod.

provided with means into and out of engagement 7 58. In a fastening-inserting machine, a frame, a work-support mounted upon the frame, a movable tool co-operating with the support, a movable pressure head co-operating with the support, a rod guided in the frame and through which the pressure-head is actuated, the rod and frame having opposite relatively inclined surfaces, a clutch member for engagement with the surfaces, retaining means by which the member is held normally out of clutching engagement with the surfaces, and means acting upon movement of the tool for releasing the clutch member from the retaining means.

59. In a fastening-inserting machine, a frame, a work-support mounted upon the frame, a movabel tool co-operating with the support, a movable pressure-head co-operating with the sup- 'port, a rod guided inthe frame and through which the pressure-head is actuated, the rod and frame having opposite relatively inclined surfaces, a clutch member, a spring by which the clutch member is urged into clutching engagement with the surfaces, a member movable to overcome the force of the spring, and means acting upon movement of the tool to actuate said member.

60. In a fastening-inserting machine, a frame, a work-support mounted upon the frame, a movable tool co-operating with the support, a movable pressure-head co-operating with the support, a rod guided in the frame and through which the pressure-head is actuated, a cage through which the rod passes, said cage and rod having opposite relatively inclined surfaces, a roll contained in the cage between said 'surfaces, a spring by which the roll is urged against the surfaces, a power-shaft, a cam upon the shaft by which the tool is moved, a second cam upon the power-shaft,'a second shaft, an arm upon the second shaft for engagement by the second cam, and an arm upon the second shaft acting to overcome the force of the spring.

'61. In a fastening-inserting machine, a frame, a work-support mounted upon the frame, a movable tool co-operating with the support, opposite I side-rods guided upon the frame a pressurehead carried by the side-rodsand co opera;tin'g with the support, clutch devices carried by the frame for engagement with both "side-rods, and means for controlling both clutch devices.

62. In a fastening-inserting machinegafram, a work-support mounted upon the frame, a mov able tool co-operatingwith the support, opposite FRANK E. STRATTON.

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