US1865855A - Buffing machine - Google Patents

Description

Patentecl July 5, 1932 UNITED STATES;

PATENT service EDV/*ARD F. HODGKINS, OF BEVERLY, MASSACHUSETTS, ASSIGNOR T0 UNITED SHOE T/ EA'CHINERY CORPOB-ATON-,- i NEW VJERSEY OI?V PATERSON, NEW JERSEY, A CORPORATION OF BUFFING MACHINE Application filed November 20,1928. Serial No. 320,585.

upon an elongated inflatable casinggof theV type illustrated in UnitedStates Letters Patent No. 1,575,686, granted March 9, 1926, upon my application, such machines being especially' adapted for buiiing or scouring they breasts of Louis heels..

In machines of the type above mentioned the inflatable casing, whichV carries on it an abrasive cover, is mounted upon a hollow,

driven spindle through which air under pres-A sure is supplied to inflate the casing. The casing is tubular in form, having an `open inner end to receive the spindle over which it is drawn. As the material of the casing is yieldable, such as rubber or rubber composition, it is desirable to secure each end of the casing to the spindle, not onlyto prevent twisting of the casing with respectto the s aindle due to the frictional drag of the work against which the abrasive covered casingis rotated, but also to-prevent longitudinal displacement of either end of the casing with respect to the spindle, whichl displacement, if not prevented, might result from the tendency 'of the casing to elongate under inflation.

@ne of the objects of this invention is to provide an improved means of securing each end of an inflatable casing of the type referred to to its spindle in such a manner as to overcome any tendency on the part of the casing to twist or to be displaced longitudinally with respect to the spindle. Y

In accordance with this object, one feature of the invention resides in improved .means for securing the outer end of a casing from twisting relatively to a spindle on which it is mounted. VIn the illustrated organization, the rotary spindle has at its outerend a recess of non-circular crosssection, and the outer end of the resilient casing carried upon the spindle is provided with a rigid member bonded to the rubber casing and having a portion of a cross-section complementary to the noncircular cross-section'of the recess in the spindle and adapted to enter the recess to prevent twisting of the-casing with respect tothe spindle. The recess in the spindle constitutes a socket, which, in the illustratedv l spindle, is square. The socket and the shank of the rigid member to which the casing is bonded together constitute a nonrotary coupling for preventing relative twist loe,-

tween the outer end of the casing and 'the i spindle.

The invention provides also, as a further feature, novel r means for preventing both` wear and distortionof the outer end of the casing under the pressure of work applied to 'the-,abrasive cover,` thereby to avoid loosenlng of the bond betwen the above-mentioned rlgld member and the casing. To this end, a

rigid cup is provided surrounding the lower ,A

or outer end of the casing, which affords additional bonding surface for the pad, as well as preventing wear and distortion. As i1- lustrated, the rigid polygonal coupling member referred to above is both fixedly secured to the cup and isembedded in the casing, thereby providing a positive .interlocking bond between itself and the material of the pad in which is is embedded.

Still another fea-ture of the invention Aresides in novel means to prevent a casing `of the type above-mentioned from elongating under pressure, and thus to prevent longitudinal displacement between the outerend of the casing and the spindle. Inthe illustrated Y construction, the means forV preventing such longitudinal displacement includes a spring latch extending within the spindle from the outer end of the casing into an opening in the spindle wall, the opening being located at av point .adjacent to the open end of the casing to render the latch accessible.

The above described tubular casing may be formed by molding the material of the casing in a longitudinally split mold, the central hollow portion of the casing being formed `.by a core The end of the core adj acentto the open end of the casing may be supportedby the mold; but it is apparent that unlesssome positive support is providedl for the other end of the core, the unsupported end ofthe core might, in the process of filling the mold and kneading the unvulcanizedrubber, be forced out of alinement with the mold, and the reand coveis one end of the casing, and which is constructed and arranged to support one end of the core during the molding of the casing, the rigid member having a cylindrical portion which surrounds an end of the casing. The above-described rigid cup and the coupling member secured thereto may constitute such a means for supporting and centering the core, the later being provided with a socket of complementary cross section to that of the shank of the coupling member to enable the shank of the coupling member to fit into the socket of the core during the process of molding.

A further feature of the invention consists in the provision of a readily replaceable member, illustrated as a grommet, which is interposed between the edge of the inner end of the abrasive cover and a collar which clamps the casing to its spindle. The illustrated grommet has a portion surrounding the casing and interposed between the casing and the abrasive cover, and it has also an outwardly extending flange beyond the end of the abrasive cover. This grommet serves to protect the edge of the clamping collar from the abrading action of the edge of the abrasive cover. Vhen it is desired to space the end of the abrasive cover from the casing securing means, a plurality of such grommets may be employed. In such case the additional grominet or grommets serve to prevent bulging of the casing between the edge of the abrasive cover and the casing securing means.

These and other features of the invention will now be set forth in detail in the accompanying drawing, in which Fig. 1 is an elevation of the head of a buffing machine embodying the invention in a preferred form;

Fig. 2 is a side elevation of the bu'ing tool of the machine with parts broken away and vin section;

Fig. 3 is a perspective view of the rigid member for preventing twisting of the outer end of the resilient tool cas-ing with respect to the spindle;

Fig. 4 is a side elevation, partly in section,

showing the arrangement of the abrasive cover with respect to the resilient tool casing; and

Fig. 5 is a fragmentary perspective view showing a detaching tool in the operation of detaching the resilient casing from the spindle.

The illustrated buifing machine, which is a Naumkeag machine of the type disclosed in the above-mentioned Letters Patent, is provided with a laterally extending head 10 which carries bearings 12 and 14 within which is supported for rotation a hollow spindle 16. Air is supplied to the spindle 16 through a passage 18, and a pulley 2O is provided between the bearings 12 and 14 to rotate the spindle 16. A portion of the spindle 16 below the lower bearing 12 and spaced from the end of the spindle is externally threaded at 22. The lower end of the spindle 16 is recessed to provide a socket 24 of polygonal cross-section, shown in the illustrated spindle as square. A suitable aperture 26 is provided in the lateral walls of the spindle 16, for a purpose later to be eX- plained.

A resilient inatable bufling tool 28, having an abrasive cover, is carried upon the rotatably driven spindle 16. The tool 28 is of the roll type, the illustrated tool being in the form of a cylindrical roll, which form is especially adapted to be used for bufng or scouring the breasts of Louis heels and also for bufling the scallop which is provided in some heels of this type. The curvature of the breast of a Louis heel is such that it can be effectively buifed by the use of a cylindrical roll of relatively small diameter, an inch or less, for example. If such a roll is mounted so that one end is free for presentation of the work, it may also be used for buliing the scallop in the lower end of the breast of the heel. As the spindle 16 is rotated, the frictional drag of the work, actingY through the abrasive cover upon the rotating tool, tends to twist the latter relatively to the spindle. with compressed air, tends to expand in all directions and therefore to elongate, the ends of the tool thus being subject to longitudinal displacement with respect to the spindle. It is accordingly desirable to provide a tool which is adapted at both ends to be secured to the spindle so as to prevent both relative twist and longitudinal movement.

The illustrated buffing tool comprises a hollow cylindrical pad or casing 30 of resilient material, such as rubber or rubber composition hereinafter termed rubber, one end of which is molded and vulcanized into a shaped holding device 32, the function of which will presently be described. The cupshaped device 32 comprises a metal cup having a cylindrical side wall 34 and a diskshaped bottom wall 36, in combination with a rigid metallic member consisting of upper vand lower disks 38 and 40 respectively, ar-

parallel to the rod 44 and arranged on the circumference lof a circle concentric with the The tool, being inflated rigid hollow member in the form of a cup- 7 tof axis, ofthe rod 44, the upper surface ofthe upper disk 38 having an axially extending shank 48 o fk polygonal cross-section, shown inthe illustrated device as square, which is complementary t the socket-24 and which is adapted to form a non-rotary coupling with the socket 24. rllhe rubber ofthe casing 30 during its manufacture being mol-ded into the space within the cylindrical wall 34 and about the rod'svv44 and 46, and being vulcanizedin the process off'molding, as will here-v inafter be explained', adheres to the inner surface of the wall 34 and to the respective inner,- surfaces of the disks 38 and 40, as well ast-o the rods 44 and 46, the bond between the rubber and the. device 32 being not merely adhesive, butpositive and interlocking, for the rods 46 interlock with the rubberpositively to. prevent twisting or relative rotation, and the. innersurfaces of the disks 38 and 40 abut the intervening material of the casing 30. It will be notedthat the endV of the casing which fits within thev device32 is reduced in diameter by a. distance equal to twice the thickness of the cup wall 34. It will also benoted that, this end portion is solid, as the central opening whichextends from the open end of the tool is terminated by the disk 38. The cylindrical Wall 34 not only affords additional bonding surface for the material of thecasing 8O which is molded and'vulcanized within it, but it also serves to protect the end of they casing from chafing and wear, and from distortion. Without the cylindrical wall 34, the material'at the end of the casing 30 might wear down sufliciently to expose therods 46, thus ceasing to interlock with thesev rods, while sufficient distortion ofthe endJ of thev casing might occur under pressure of work applied'to the abrasive cover over this, point to loosen the bond between the various members ofthe device 32 and the casing.

Thegshank 48`is not only non-rotatably engaged with the spindle in the socket 24, but is held, against longitudinal movement withy respect tothev socket. To' this end, Ithe free endv of the shank 48 is slotted at 50, the slot being bridged by a pin 52 to which is hinged f one end ofa .spring ylatch member 54, which mayy be of wire and which is adapted' to extend upwardly withinrthe hollow portion of the spindle 16, and by the engagement of its oppositeend 56 with the spindle to hold the casing 30 againstelongation or stretching. The latch member 54, at a point between its endsl and nearer to the end 56 than the endY whichis hinged to the pin 52, is bent back upon itself, in the manner of a safety-pin, through a closed loop 58 consisting of about two full turns. The loop 58 thusdivides the member 54 into twoarms of unequal length; andwthesel arms, becauseof the resilience of thehinaterial of which` the member 54; is composed, and especially because ofthe spring action-of the -loop 58, tend toseparate-or expand, being confined; within theinterior of the hollow spindle 16. The end' 56 of the member^54 is'formed to ente-rv an opening 60 in the wall ofthe spindle 16. The opening 60 is positioned adjacent to the open endof the casing 30 when 4the latter is inoperative position upon the spindle 16, and the open.- ing 60 may be so positioned, as shown in the illustrated structure, as to be covered bythe casing 30. As illustrated, the opening 6Qis also positioned inline with one of thecorners of the socket 24 to facilitate correctly entering the shank 48 in the socket 24. so as tobring the end56of the member 541into-line with the opening 60. The-two above-.mentioned armsof the member 54 are formedof such length as to bring the end 56' of the vmember- 54v exactly into register with ther opening 60 when theshank 48Y is correctly: and fully entered within the socket 24; and when thus in register, the end 56 will'snap into the opening-60 by virtue of,v the tendencyiofthe two armsof the member 54 to expand, due

to the above-mentioned spring action, andi will thus hold the lower end of the casing 30, through the holding device-32, against longi tudinal movement relative to the spindle 16 due to the tendency ofthe casing 30. to expand under inflation, or for any other reason.

The spin'dle 16 is of relatively largediameter at its threadedv portion 22` andbelow this port-ion to the end ofthe spindle the diameter is reduce-d to accommodate the casing 30, .such

reduction of` diameter forming a shoulder 62"..

against which- 'the open end ofthe casing 30 abuts. The casing 30 has an outwardly extendingV flange 64 surrounding its open end. Threaded on the threaded portion 22 of the spindle 16 is a nut 66 constituting acollar for clamping the flange 64 against the shoulder 62, having an inwardly extending ange 68 and recesses 70 for a wrench. Interposedbetween the flange 68 andthe flange 64' of the casing '30 is an antifriction washer 72Y which;

permits tightening of the collar 66 without twisting the iiange 64.v To assembletheztool 28 upon the machine, the collar'66 is first unscrewed from the threaded portion 22 and removed from the spindle 16. The casing 80 is then drawn over the endv of the spindle 16, the latter extending into the open end of the casing 30, and the casing 30' being held in such position as to bring the end 56 of the latchmember 54 into alinement with the opening 60 in the spindlewall. rlhe casing 30 is then pushed vup on the spindle 16 as far as it will go; and the shank 48 will enter the socket 24, the end 56 of the latch member 54 will snap into the opening 60, and the open-v end of the casing 80 will abut the .shoulder 62. The collar 66' is 'then replaced upon the spindle 16, over the tool28, and is screwed upon the threaded portion 22. Upon tightening the collar 66, the flange 64 ofthe casing 80;v

will be compressed between the washer 72 and the shoulder 62, by a clamping pressure directed lengthwise of the spindle 16, and will thus be firmly secured to the spindle 16 against both axial and twisting movement. An annular groove 74 is formed in the shoulder 62, and upon tightening the collar 66, some of the material of the flange 64 is forced into the groove 74, completely filling the groove. This eects an air-tight connection between the open end of the casing 30 and the spindle 16, and at the same time eliminates any possible tendency of this end of the casing to twist relatively to the spindle.

The casing 30 is preferably molded and vulcanized in a. two-part, longitudinally split mold, the internal shape of which corresponds to the external shape of the casing 30 together with the holding device 32 attached thereto. A central core is employed to provide for the central opening of the casing 30 which accommodates the spindle 16. The end of the core adjacent to the open end of the casing 3() is supported by the adjacent end of the mold. The other end of the core has a socket similar in all respects to the socket 24 of the spindle 16, and the shank 4S of the holding device 32 is first inserted into the socket of the core as far as permitted by the flange 38. The cylindrical or cup wall 34 of the cup-shaped'device 32 exactly fits the interior of the mold, having the same cross-seo tion, and thus, through the shank 48, positively supports and centers the end of the core. The open space within the mold is then filled with the unvulcanized rubber which is to be made into the casing 30, and this material is vulcanized in the ordinary way to bring it to a permanent set. rlhe material `which fills the cup-like portion of the device 32 may be of different composition from that which is to form the body of the casing 36, so as to render the solid end of the casing 30 somewhat harder and firmer than that portion which is hollow and subject to inflation, to enable this end portion better to withstand the supporting and driving stress introduced into the casing 30 through the device 32 at this point. The cylindrical or cup wall 34 is found to be of very great advantage in the process of molding, for, as above pointed out, it affords a support for the end of the core. If this end of the core were not supported, it would be likely, in the process of kneading and molding the rubber or composition, to be forced out of exact alinement with the axis` of the mold, and the result would be an unbalanced casing, thicker on one side than the other. The external side wall of the casing 30 and the exterior of the cup wall 34 are of equal diameter, in cross-section, at their line -of contact, and they form a continuous surface which, in the illustrated tool, is cylindrical.

A cover 76 of abrasive material, such as emery paper, having its overlapping ends glued or otherwise secured together to form a -cylinder of slightly greater diameter than that of the uni flated casing 30, is carried upon the casing. When air under pressure is admitted through the passage 18 to the interior of the hollow spindle 16, soine of the air passes out through the aperture 26 and expands the casing 30, causing it to grip the interior wall of the cylindrical cover 76 and to hold the cover firmly in frictional engagement. The cushion of air between the casing 30 and the spindle 16 insures a yielding action of the abrasive cover' 76 upon the work.

,Vilhile the pneumatic cushion thus providedA throughout the greater part of the length of the tool does not extend completely to the end of the tool, because the hollow portion of the casing 30 terminates at the upper surface of the disk 88, nevertheless a cushioning eect is obtained even at the very end of the tool by reason of the fact thaiJ trie diameter of the abrasive cover is slightly larger than the diameter of the solid end of the tool, and is supported at this point by its inherent stiff. ness, which is assisted somewhat by the action of centrifugal force, and not directly by the end portion of the tool.

The abrasive cover 76 has been found, during operation, to have a tendency to work up-v ward. ln order to prevent the rough upper edge of the abrasive cover 76 from wearing or cutting an annular groove in the lower face of the clamping collar 66, a grommet 78 is employed. rl`he groinmet 76 may be formed of sheet brass, and consists of a cylindrical portion which is interposed between the casing 30 and the cover 76, and an outwardly extending iiange 60 'which is interposed between the upper edge of the cover 76 and the lower face of the clamping nut 66. :[ty may be noted that the grommet 78 affords a cheap and readily replaceable means for protecting the lower face of the clamping nut 66.

lt is desirable, under certain conditions of operation, have the lower sive cover 76 extend below the end of the tool upon which it is carried. 1n this case the overhanging end 82 (Figs. 2 and 4) of the abrasive cover 76 is supported by its inherent stiffness and by centrifugal force, with no material backing, thus affording an especially soft cushioning effect of the abrasive material against the wor-k. rlfhe overhang'of the end 82 may be obtained, in the first instance, by making the cover 76 of sufficient length to extend from the lower face of the clamping nut 66 to a point below the end of the tool. As the abrasive material at the end 82 wears away, it is in the interest of economy to cut o the end of the cover 76 and to move the cover down to present a fresh portion to the work, rather than to provide a new cover. When the cover 76 is thus moved down, an additional grommet 84, similar in all respects end of the abrato the first grommet 78, is employed. The

lange'80-of the 'grommet 84 abutsthe upper edge of the cover 7 6 and prevents the latter "from working upward,whilethefirst grommet 78 Yacts as a lstop orspacer member to `prevent thesecond grommet 84 from work- Vin'gupward, .and also serves yto prevent the otherwise exposedportion of the casing "frombul'gingr `But forthe grommets 78'and .84,`the exposed portion of the casing 30 would be'likely to bulge over the upper edge of the abrasive cover 76, and might be injuredlby `contact with this rough upperedge. As the 'overhanging end 82is used up, the cover 7 6 .may thus "be `moved 'down again f and lfurther grommets added.

.Thespringlatch'member 54-may be disfengaged 'fromthe spindlel'by the insertion 'o'fa blunt l'tool'.into the opening 60 to force back'the end 56, whereupon the Acasing 30 maybe lwitlrdrawn. To accomplish this, the

'collar'66 is first unscrewed and removed from the spindlel. While the opening 6() is covered the casing 30 when the latter is in Operative position, the casing 30, ba'cause of its flexibility, can easily'be forced down the fsh'ort distance necessary to expose the open- Asrelatively short projection'QO is disposed -be'itweenthe prongs 88 and is adapted to enter the opening `6O to disengage the end 56 "ofthe springlatch member '54. AThe prongs '88 have flatupper surfaces, both in the same plane, Vwhich are held 'against the shoulder '6:2 of the .spindle 16 while the disengaging tool is thrust forward to bring the projection 90 into Ydisengagingposition. The vforward edges`92 ofthe prongs 88 are beveled as shown atf94 to render the prongs wedge-shaped, the

-beveled Vportions 94 extending downwardly from the upper surfaces of the Vprongs 88 to" the lower surfaces so as not to destroy the .continuity of the upper surfaces. The pur* .pose oflthe bevels 94is to force the upper end -o'f the-casing 30 down a distance equal to the 'full thickness 'of the prongs-88 so as :to eX- :po'se the opening 60. The projection 90 is `.disposed between the upper 'and lower sur-v l faces ofthe prongs 88 at a point where it will Vregister with'the `opening 60 when the upper surfaces are held against'the shoulder 62. A file cutv(not shown) on `the threads 22 may b'e 4employed to mark -the position of the opening 60.

Inoperation, themachine isset in motion andthe breast of the heel is presented to the rotating tool 28, the-operator applying the heel'in a horizontal position andmoving it forward and backward to bring all parts of the breast ofthe heel intoI contact lwith the tool. The Acurvature of the tool is sufciently less than that of the breastfoftheheel topermit Aaccess to all parts thereof. v If the 'Iheel breast is scalloped the operator may .then

present the shoe in an inverted vvertical-positionand apply the scallop to the tool.

I-Iaving thus described my invention, what I claim as new and desire to securefby IIJetyters VPatent ofthe United States is:

l. In a buffing machine, a rotary spindle having `at its end a recess of non-circular cross-section, an elongated resilient casing Ycarried upon saidspindle, and a rigidmember bonded to sai-d casing and having a porti'onof a lcross-section Vcomplementary to `said non- `circular cross-section of -said recess Vand adapted to entersaid recess to prevent twisting of VSaid `casing with respect to fsaid spindle.

2.' In a bufling machine, a rotary sp'indle having-an axially extendingisocket ofpolygonal cross-section formed upon its "end, an

'elongated resilient casing 'carried Aupon "said spindle, and a rigid :member bonded to said casing and having a shank portion of acrosssection complementary tothe crossisection of 'said'socket and adapted to enter lsaid-socket to prevent twisting of said casing with respect to said spindle.

3. In a buiiing'machine, a rotary lspindle having an axially eXtending-square-'socket vformed upon its end, an elongatedresilient :casing 'carried upon saidspindlefandfa frigid Vmemberbonded tosaid casing and having a square shank adapted to enter'said socket to prevent twisting vof said ycasing-with vrespectto `said spindle.

fl. In a bufling machine, Ya Vrotary spindle, a resilient-inflatable vcasing mounted Aon said spindle, and means including la latch secured to vsaid casing'for securingsaid'casing to said spindle,said lcasing having an open end and a closed end and said latch having aportion adjacent to the open end of'said casing to .render thelatch accessible for'operation.

5. In a 'buflingmachine, a rotary spindle, a resilient casing mounted on said spindle,

Ameans for -securing one end of said casing'to said spindle, means for preventing relative twisting betweenthe opposite endof said casn ing and said spindle, landmeans including a spring latch Y'for preventing'rela'tive"longitudinal displacement betweensaid iopposite end of said casing and saidspindle. i

6. In a buil-lng machine, a rotary spindle, a resilient casingmounted on said spindle, means for securingone 'end of said 'casing' to said spindle, a non-rotary socket connection fbetween'the opposite'end of said `casing'and said spindle, and-means including `a spring latch for preventing relative longitudinal di splacement between said oppositefe'nd Vof'said .casing'and 'said'spindle Y ing longitudinal displacement between said opposite end of said casing and said spindle.

8. In a bufling machine, a rotary hollow7 spindle having an opening in its wall, a resilient casing having an open end, said Spindle extending into said casing through said open end thereof, means for securing said casing at a point adjacent to the open end thereof to said spindle, and means including a spring latch engageable with the wall of the spindle in said opening for secu ing the opposite end of said casing to said spindle, said spring latch extending within said spindle from said opposite end of said casing to said opening, and said opening being located at a point adjacent to said open end of said casing to render said latch accessible through said opening.

9. In a bufling machine, a hollow rotary spindle having an opening in its wall, a resilient casing having an open end, said spindle extending into said casing through said open end thereof and said opening in the wall of said spindle being adjacent to said open end of said casing, means for securing said casing at the open end thereof to said spindle to prevent relative longitudinal and rotary displacement between said open end of said casing and said spindle, means including a socket connection for preventing relative rotary displacement between the opposite end of said casing and said spindle, and spring means secured to said opposite end of said casing and extending within said hollow spindle to said opening in the wall thereof, said spring means being engageable with said opening to prevent longitudinal displacement of said opposite end of said casing with respect to saidspindle.

10. Ina bufling machine, a rotary spindle,

a carrier for an abrasive cover, means for securing said carrier to said spindle, an abrasive cover mounted on said carrier, and a replaceable member interposed between an edge of said abrasive cover and said carrier securing means to protect the latter 'from contact with said edge of said cover.

1l. In a buffing machine, a rotary spindle, an elongated inflatable casing, means for securing said casing to said spindle, an abrasive cover surrounding said casing, and a replaceable member interposed between the edge of one end of said abrasive cover and said casing securing means to protect the latter from contact with said edge of said cover.

12. In a buffing machine, a rotary spindle, an elongated inflatable casing mounted on.. said spindle, an abrasive cover surrounding '70 said casing, and a grominet having a portion surrounding sai-d casing and interposed between said casing and said cover adjacent to one end of said cover, said grommet having.n an outwardly extending flange beyond said 7 end of said cover. Y

13. In a buliing machine, a rotary spindle, an elongated inflatable casing, means for securing said casing on said spindle, an abran sive cover surrounding said casing, and means interposed between the edge of one end of said abrasive cover and saidcasing securing means, said interposed means being adapted to space said end of said cover from said casing securing means and to prevent bulging of said casing between said edge of said cover and said casing securing means.

14. In a buffing machine, a rotary spindle, an elongated inflatable casing, means for.. securing said casing on said spindle, an abrasive cover surrounding said casing, one end of said cover extending beyond one end of said casing, and a plurality of grommets surrounding said casing and interposed be-. tween the opposite end of said cover and said casing securing means to space said opposite end of said cover from said casing securing means and to prevent bulging of said cover between said opposite end of said cover` and said casing securing means.

l5. In a bulfmg machine, rotary hollow spindle having a shoulder spaced from the end of the spindle and havingan opening in the wall of said spindle between saidA shoulder and said end, and also having a noncircular socket in said end, said shoulder, said opening and said socket being adapted to cooperate with corresponding parts of a bufiing tool tomaintain said tool on said spindle.

16. In a bufling machine, a rotary hollow spindle having an opening in its wall spaced from the end of said spindle and having a square socket at its end, said opening and said socket bein adapted to cooperate with corresponding parts of a bufling tool to maintain said tool on said spindle, and said openfico `ing being in line with one of the corners of said socket to facilitate the placing of said tool on said spindle in such position as to L@ enable said corresponding part of said tool to register with said opening.

17. In .a bufling tool, in combination, a rigid device having a cup-shaped portion and aportion adapted to be connected with a rotary driven member, and a yieldable casing having one end carried within said cup-shaped portion, the remaining portion of said casing extending beyond the open end of said cup-shaped portion and said device ISO and the end of the casing Within the cupshaped portion of said device being interlocked.

18. In a bufling tool, in combination, a rigid device having a cup-shaped portion and a portion adapted to be connected With a rotary driven member, and a yieldable casing having one end carried Within said cupshaped portion, the remaining portion of said casing extending beyond the open end of said cup-shaped portion and the end of the casing Within the cup-shaped portion of said device being bonded to said device.

19. In a buiing tool, a tubular molded and vulcanized rubber casing adapted to carry an abrasive cover, and a rigid member having a cylindrical portion surrounding an end of said casing to protect said end against Wear, said rigid member being secured to said end of said casing by interlocking With the material of said casing, said rigid member being constructed and arranged to support one end of a core which forms the central hollow of said casing in the process of molding and vulcanizing the latter.

20. In a buiiing tool, in combination, a tubular casing of yieldable material having an outer end and an open inner end to permit the casing to be drawn over a hollow spindle, a latch Within said casing adapted to enter and to engage the hollow spindle, and means for securing said latch to said outer end of said casing.

2l. In a buing tool, in combination, a tubular casing of yieldable material havingV an outer end and an open inner end to permit the casing to be drawn over a hollovv spindle, a latch Within the casing adapted to enter the hollou7 spindle, said latch having a pair of arms resiliently tending to expand against the inside Wall of the spindle, one of said arms being constructed and arranged to engage an opening in the Wall of the spindle, and means for securing one of said arms to said outer end of said casing.

22. In a builing machine, a rotary spindle constructed and arranged to be engaged by a latch at a point spaced from the ends of the spindle, a resilient casing mounted on said spindle, and a latch secured to said casing and engageable With said spindle at said point for securing said casing to said spindle.

23. In a buiiing machine, a rotary spindle, a resilient casing mounted on said spindle, said casing having an open end into Which the spindle extends and having its opposite end closed, and a spring latch secured to said casing for securing said casing to said spindle at a point adjacent to the open end of said spindle.

In testimony Wherof I have signed my name to this s eciication.

EDVVARD F. HODGKINS.

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