US2444969A - Welt hold-down - Google Patents

Description

July 13, 1948. c. K. WCQQODMAN 2,444,969

WELI'I HOLDDOWN v I Filed July 15, 1946 4 Sheets-Sheet 1 Inventor Char/es K Woodman 5 his Attorney WELT HOLDDOWN Filed July 15, 1946 4 Sheets-Sheet 2 Inventor. Charles /K Woodman 45 his fitter-my y 4 c. K. WOODMAN 2,444,969

WELT HOLDDOWN Fild July 15, 1946 4 Sheets-Sheei Inventor Char/es A. Woodman July 13, 19.48. c. K. WOODMAN 2,444,969

WELT HOLDDOWN Filed July 15, 1946 4 Sheets-Sheet 4 [nuntor Char/es Woodmafl By his Attorngy ?atenfecl July 13, 194

Charles K. Woodman, Beverly, Mass, assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey Application July 15, 1946, Serial No. 683,653

This invention relates to welt holddowns and particularly to the provision of an improved welt Recently developed types of cement which have come into extensive use for sole attaching require considerably more pressure than is required to produce a satisfactory bond with the pyroxylin cement which was formerly used almost exclusively. Consequently, the welt holddowns which are employed in cement sole attaching machines must be capable of sustaining, without collapsing, a higher degree of pressure than was formerly employed but must still be sufficiently flexible to enable them tobe conformed easily to the contour of the shoe being operated upon, and the pressure devices which are used to cause the holddowns to press the welt of a shoe against the margin of the outsole must be capableof producing an increased amount of pressure with a given amount of effort on the part of the operator.

' It is an object of the present invention to provide an improved welt holddown which will support andapply adequate pressure to the welt of a shoe to cause it to adhere securely to the sole, without materially interfering with the manipulation of the work or its insertion in, or removal from, the sole attaching machine.

In contrast to the soft rubber welt pressing members commonly employed in welt holddowns a feature of the present invention resides in a welt holddown comprising a U-shaped series of nested concavo-convex cylindrically curved plates Claims. (01.12-33) combined with means for holding said plates in.

contact with each other. Preferably, the plates will be held in contact by. a flexible cable passing through them and provided with means, such as springs, for engaging the endmost plates of the series and holding all the plates in contact with each other. Although the plates may be of hard rigid material such, for example, as metal, capable of sustainingheavy pressure without collapsing, the welt engaging member as a whole is sufiiciently flexible to conform readily to the forepart of a shoe and need, not be bulky enough to interfere with the necessary manipulation and positioning of the shoe.

2 tion in which a shoe to be operated upon is most easily inserted.

Other features of the invention, including improved means for pressing the welt engaging member into the welt crease of a shoe and improved mechanism for pressing the welt pressing member against the welt, will become apparent from reading the following detailed description of one successful embodiment of the invention in connection with the accompanying drawings, in which Fig. 1 is a view in front elevation of the apparatus;

Fig. 2 is a plan view showing the welt pressing member and its mountings;

Fig. 3 is an angular view on an enlarged scale of the welt pressing member;

Fig. 4 is an enlarged sectional view of a detail of the welt pressing member;

Figs. 5 and 6 showdetails of apparatus for pressing the welt engaging member into the welt crease of a shoe;

Fig. '7 is a view in side elevation of manually operable mechanism for pressing the welt pressing member against the Welt; and

Fig. 8 is a plan view of one of the concavo-convex plates of the welt pressing member.

Referring now to the drawings, Ill indicates the pad box and I2 the press pad of a sole' attaching machine by which an outsole may be cement attached to a shoe l6 having a welt I8. A well-known machine of this type which is in extensive use is dissolved in United States Letters Patent No. 2,047,185, granted July 14, 1936, upon application of Milton H. Ballard, et al., to which patent reference may be had for a full description of the mechanism of the machine which constitutes no part of the present invention.

Pivoted at 20, 22 (Fig. 2) upon the pad box ID are plates 24, 26 which are slotted concentrically with their respetive pivots as shown at 28, the slotted portions overlapping and cooperating with a locking bolt 30 which may be operated to prevent the plates from swinging about their pivots or released to permit such swinging movement. This, locking bolt, as illustrated, may be the same as the locking bolt I20 shown in the aforesaid patent.

Springs 32, 34 anchored at 33 and 35, respectively, to the pad box ID are attached to the plates 24, 26 at such points as always to tend to rotate the plate 24 in a clockwise direction and the plate 26 in a counterclockwise direction, as viewed in Fig. 2.

Ja o t e p d-as he -m tely asshoWmL Inasmuch as the movable parts at the two sides of the pad box are alike, it will be sufficient to describe the parts at one side in detail. Pivoted at 36 to an overhanging portion 31 of an upright 38 integral with the plate 26 is a gage arm 40 which is freely movable vertically about the pivot. A rearward extension 42 is adjustably mounted upon thei'under 'sidesofothe arm 40 bymeans of a screw and slot connection 44 and. has pivoted upon its rear end portion, at 46, a sole gage @563 which is best shown in Figs. 2 and 5. A pin 41 extending downward from the gage member 48 into an arcuate slot in the extension v i2;,tlirnits the scope of the turning movement ofithe gagje about the pivot 46. By reasongsofzztthe, pivotal mounting at 36 of the gage armjll bywhich the sole gage is carried, the gage is free to rest loosely upon the pad l2, rising or falling as rriay be required to follow the contour of the upper gage arm is swung inward ly or outwardly thereof. Carried by the sole. gage 48, above jg girigg'pb itio thereo1 ,1is a presser "mg a f ha'nktz slidable in apthorizontal 'guideway The 's-hanRiEZ .is bored out.to .receive com- I on spring .56 oneiend. of which bgearsfagainst t the bore an'd the other of, which gainst a fiattenedfa ce of a pin 58 secured inthe ottom of .theguideway i5 1; p,

The shank 52 is slotted as shown at 63 to: re- 2 ire the p n-, and en ndf i is adapted to abut against an adjustable stop .1screwt6lwl1 q i threadedtt r g t e. e er ie'iid minating somewhat short of the two ends the assembly. This spring is sufiiciently stiff and resilient so that its normal tendency to straighten out causes the U-shaped welt pressing member 66 to open out to a size and shape which will permit easy insertion of a shoe when no inward pressure is exerted upon the side portions of said mb a Attached to the sides of the U-shaped member are lugs 85 provided with vertical holes 88 for ,the reception of pivot pins 90 by which the welt pressing member is connected to blocks 92 mount- .ed'tatinn.and slit et pon supp i s- .9d. .extendingralongside the side portions of the portion of the gage member-48 5A sp ingi l b ca *Wm h;@m r3r h Ff z -LBH xe t'sf e t fffi tion upon the screw to prevent the latter from r ea c d t l rtr \EQ ii; to i "'15 t A u-s apeti flexible/we t ressin tm @125 ;-($ee;liigs.: 2 -and 3) comprises a, series or nested,

jooncavorconv x.stc l ndrl fiylly u ed; slates, arranged with their curved faces-in;movabl.e;,sliding contact with; each other. andwvith their axes of: curyatureiextendine verticall -t\ h tshaneo each plate te,, ;as;se.en. n re ey t pntis appr is substantiallwashslr V U 8,, 'ljhe .lowenends of the :plates; 63.: and. cgusequen y, the. lower .edge of ,th welt :pressing, member 6(5, of which: they are .QCOHSEI'HQIIQQ firfl formed, to enter the welttcreaseoi a. shoe andlbda upo ltt i e upper'face of v the;welt to press the .latter into firm contacttwithrthe outsole to which it is to be cce a s d 1 n B tmentattach'edw it The plates. $533. are vstrung it .12, thetends of which; extend beyond the..as- -sembly of-plates 63 as shownvin Figs..2,13..and 4 and aresurrounded lay-compressionsprings 14,

cf the 'platesrelative to each other is 'sufi'icient to allow the welt pressing anember 'as'a whole to conform to the vertical contour or the shoe and th relative sliding movement in a horizontal sense, whichis also perinitt e'd fby the holes being larger than V the cables facilitates the fitting of forepart qr theshoe.

In addition to the twoc ables 1t, "fifth-that- J the weit pressing member closely "astute the tached, close-wound wire spring '84 eXte'n'ds'l'oose ly throughout most of the series of plates 68, terlz asfitandi e tzni l member 66" Thevforward ends of the rods 94 are pivoted ahfiii ipryertical swinging movement in swivel block's ll't each of Which has 2. depending .stemultt which is rotatable in a bearing in the overhanging portion fi'l of one of the uprights 38. E acn stem it!) has a circumferential groove vlil l eng ed-Bria .fi h g i ldi i t we; ,rn ese tor' iiis mdiintriig 's'tnatf rti xis o the tvert e ksfiem, WP.-

a SP lie surrounding the pivot Q Btends continua evate t su po n 18 end [:14 hr thelr i. te r; th sp n s .H he s des. at; s earsttus ar wound. in. opppsitesdiresti nsi am bein of the rod' wEM. i11 ,a direction toglift tlg'd @9 3 308m sideofithe welt Zpressingmember ,EBMand tiltits upper edge outward, thus gpresentingsthe ,yqelt pressing member inlgthe, most advantageous position for easy insertion of a shoe. The pressure 7, device, i013 pressingthe member 66 downward tupon thecwelt. 0f :ttlf ets qel s. b -Dh lys'imilar. to. that disclosedv in United-Stat s, L 1 ters .Patent,;No.., 2,138,960, granted ,Dec'ember 6, 1938, upon application .of Sidney Einnibut .B bodies vsubstantial improvements which shake it effective to produceianiricreasedamountl of. pressure with'ra. given amount of effort on the part of the operator. .i V v r- .w

Ref e'rring .particularly to .liigs; l l, ands'lwat U shaped pressure block H6. is .1pivota11y suspended onstuds |i8.'secured. in .a. block l2D-u'whichhis mounted to slide vertically upon apostlLZZ which carries the vtoepad. .l 24 by which the 'forepart. of a shoe is pressed downward Juponlthe. press iipad t2.- The weight of tlie pressure.tdevicesis supported by compression springs 126 which 'tend tohold the block-12E! elevated, it t Pins "I281. extendingtfrom opposite sides of tthe block- -I 2 ll are engaged in islots 30 iina bifurcated lever I32, one end oftwhich isipivotdratllt l tu'pon a -bracke't l36 dependingjro-rn theZ'p-re'ssurel head I38 of the she attaching imachine. ;Z-Ihe...other end of the lever [32 is providediwithta'block..l40 adapted to be-en'gaged by:an-adjustableipressure transmitter I42 which is rotatably'smouhtedion a "pinld l s'e'cured in a'leverx ['48 movajhletaboiit a stud l 43 secured in thepressure head lai8.v The pressure transmitter [42L is. formed with an varm I59 in which is a \rotaitableulplug .l52 through which passes the shank portion .ofwai sores/1454 which is freely rotatable but is .i'estraihedwfrom I longitudinal movement through the plug I52 by at collar I66 and the hub of ahead [58,both of which are fixed upon the screw. The threaded portion of the screw is engaged in a threaded hole in a plug I60 which is similar to the plug I52 and is held in the outer end ofthe lever I46. The curved lower face I62 of the pressure transmitter is eccentrically related to the pin='I44, with the result that when the screw I54 is turned,and the transmitter is rocked about the axisof the pin I44, the space between the face I62 of the transmitter and the top of the block I40 is varied as may be required to adjustthe apparatus according to the height of the surface of the press pad I2 and the thickness of the welt and sole of the shoe to be operated upon. With any given adjustment, however, the transmitter'itZ and the lever I46 are in fixed relation to each other.

Pressure is applied manually, through the pressure device, to the welt pressing member 66 by pulling forward upon ahand lever I64 which is rotatable about a stud l66 carried by a bracket I68 integral with the pressure head I38. A cam face, comprising an eccentric portion I and a semi-circular recess I12 formed upon the lever I64, is arranged to be engaged by a cooperating nose I14 of the pressure transmitter I42. The lower edge of the hand lever member I64 is curved concentrically with the stud I66 and is serrated as shown at I16. The serrations are engageable by a pawl I18 under the influence. of ,a spring I80 which is anchored-to a pin I02 inserted in the lever I46, and a torsion spring I84 which bears against a pin I86 fixed in the lever I64 tends, when the pawl I18 is disengaged, to throw the lever back to the position shown in Fig. '1, in which the parts are shown in the positions assumed at the end of a cycle of operation, the pawl having been disengaged from the serrations I16 by a tail portion I88 of the pawl striking an adjustable, but normally stationary, stop screw I90 at the end of the upward movement of the pressure head I38 of the machine. At the beginning of the next cycle, after a sole and shoe have been positioned upon the pad I2, the pressure'head I38 is lowered to press the shoe and sole firmly down upon the pad I2 by means of the toe pad. During this movement the tail of the pawl leaves the stop screw I00, permitting the pawl to engage the serrations I16 and remain in engagement therewith until the end of the upward return movement of the pressure head I38 after the sole has been attached to the shoe.

When the shoe and sole have been pressed down upon the pressure pad 12 by the toe pad I24, the operator pulls the hand lever I64 forward imparting an initial rapid downward movement to the pressure transmitter I42 until the projection on the cam face at the juncture of the recess I12 and the eccentric portion I10 thereof has passed over the nose I14 of the transmitter and the eccentric portion I10 of the cam face is riding upon said nose, whereupon the transmitter continues to be depressed more slowly at a rate determined by the eccentricity of the portion I10 of the cam face, aifording an increased mechanical advantage and enabling the operator to exert a greatly increased amount of pressure upon the work with a given amount of effort.

In the downward movement of the transmitter I42 it engages the block I40, depressing the bifurcated lever I32, and, through the pin and slot connection I28, I30, lowers the block I and the pressure block II6 against the tension of the supporting springs I26, the parts being.

50 related and proportioned that when the hand lever I64 is pulled far forward the pressure block H6 pressed down heavily upon-the welt supporting member 66, causing said member to press the welt I8 down into firm contact with the sole I4.

In the operation of the machine the'operator positions the sole upon the press pad I2 between thejsole gages 48 which rest upon the surface of the pad and yield outwardly independently, to permit the sole to be placed as desired. The sole: gages are now locked by the locking bolt 30 to preserve the position of the solo. The welted shoe is next inserted in the-welt pressing member 66 which is yieldingly held rearward, with the upper portions of its sides tilted outward, by the combination torsion and compression springs H2, in a position most favorable for easy insertion of the shoe. The shoe is so placed in the welt pressing member that the inturned lower edge of the member occupies the crease between the Well; and the upper of the'shoe as illustrated in Fig. 5. r

' The shoe and the welt pressing member 66 are now pushed forward and downward to position the shoe properly upon the sole I4, the spring pressed presser plates 50 yielding sufliciently, if necessary, to permit the welt pressing member to be moved forward between them and serving to straighten up the sides of the welt pressing member and to press its lower edge inward snugly into the welt crease of the shoe. Whenthe shoe has been accurately registered upon the sole, the machine is started and the operation of attaching the sole to the shoe by pressure proceeds as above described.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A welt holddown comprising a U-shaped series of nested, concave-convex, cylindrically curved plates arranged with their curved faces in movable sliding contact, and means for holding said plates in contact with each other.

2. A welt holddown comprising a U-shaped series of nested, concave-convex, cylindrically curved plates, a flexible cable passing loosely through the plates of the series, and means, connected to the ends of the cable and engaging the endmost plates of the series, for holding the plates of the series in contact with each other.

3. A welt holddown comprising a U-shaped series of nested, concavo-convex, cylindrically curved plates, a flexible cable passing loosely through the plates of the series, and springs, connected to the ends of the cable and engaging the endmost plates of the series, for holding the plates of the series in contact with each other.

4. A welt holddown comprising a U-shaped series of nested, concavo-convex, cylindrically curved plates, means for holding said plates in movable contact with each other, and a spring, so tensioned as to tend to straighten the U-shaped series of plates, passing through said plates.

5. A welt holddown comprising a U-shaped, flexible welt pressing member capable of conforming to the forepart of a shoe, movable blocks to which the side portions of said member are attached, and means for continuously exerting upon said blocks a torsional force tending to lift said member and simultaneously tilt said side portions outward.

6. A welt holddown comprising a U-shaped, flexible welt pressing member capable of conforming to the forepart of a shoe, supporting rods extending alongside the side portions of said.

member; 2 b ocks attached. 1 .tousaid side: portions and: v,slidfiMyrcamgieozl on thelrods, and l-cfimbinar t onl en i n andac mnr ssi n s ings cementing the blookswtothe :IZESDflCtiVexods.

.A we t rh ddow -,Q m sie a shaped, flexible welt pressingmember .oa pable of conf m ng2 t i e repart o a s Qehsu-pporhing ds e tend ng al ngsi e the sidepor iqns :Q saidmem en a d piot ly punted for both went ealam; horizontal movements, Joloeksr attachedwto sa side po tions and l dab y arriedon whe' rods s ing e e x lmsg-izli tina ie e upon the rods,. and spring; means exerting upon l the nods? force tending to -m 0.v=e lthem 'toward each oth .8- A- we t: hn c dmn ompr sing: sol ga esde ed {n ven ag'e =QI2H 1 Bd 9f: h e Qrepart -sa sh e so a -shape.d;:flexib1e welt messing emb di p 1 ab e i ga s and zeapable on.eon, lef li lg t .-the irneutlof alshee Pre rplates carried 'by-lthe sole "gages, said-plates being; movable relatively to said gages and" az rr a nged to engage the. outer face of-thewelh pressing ember anapringmeens i yi ldi g y res eg a h-- o a d P s de endentl a nst the outer face 0f :the welt-Pressing rmembep, t ;;pness said member into phe welt creaseof v{algae shoe;

,9 Av welt .holddown l comprising, sole {gages adap e -enga e oppos te-edge o w orepart o a h e-s l a-u -s, an .d fle ibl lt m ss n memben'clisppsed,aboyewsaid gages; and eapable of nfm'm-ing -.120thee-;. 1 ar of shoe P e se ofaa, vshoe, amanually eperablerlcamfor. moving;

said p essure .devi am l r, a d-en ad sta le pressure. transmitter ,mountedpn saidlever and enga ing-1 thewam ansi mepnessuxeud w el .said am iqg'edesi ned- :to-imnant l' omhe ransmitter an 'iialrapid-vmonement --..eenside. tahle extent f6 owed pm sl en mo ement-20 les extent-mm ineneasing;meohanicaylwadvantager- REEEBEMQES. CI '1 11311 The following refevenees areof-meoord :in the file of th'ispatent:

UNIIZEDlSTATES 'PAIYE II Number" Name. 'iDate'z Certificate of Correction Patent N 0. 2,444,969.

13, 1948. CHARLES K. WOODMAN It is hereby certified th at errors appear in the printed s numbered patent requiring correction as follows: 001

pecification of the above dissolved read disclosed c l umn 2, line 33, for the word o umn 6 1-1118 3, for pressed read pre said Letters Patent should be 8868; and that the read with these correctlons therein that the same may conform to the record of the case in the Patent Ofiice Signed and sealed this 23 THOMAS F. MURPHY,

Assistant Gammissz'oner of Patents.

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