US2627707A

US2627707A - Brake cylinder hone

Info

Publication number: US2627707A
Application number: US62710A
Authority: US
Inventors: Thomas E Brooks
Original assignee: Lisle Corp
Current assignee: Lisle Corp
Priority date: 1948-11-30
Filing date: 1948-11-30
Publication date: 1953-02-10
Anticipated expiration: 1970-02-10

Description

Feb. 10, 1953 T. E. BROOKS BRAKE CYLINDER HOME 2 SHEETS-SHEET 2 Filed Nov. 50, 1948 4 ThomasE.

Patented Feb. 10, 1953 UNITED STATES TENT OFFICE BRAKE CYLINDER HONE Thomas E. Brooks, Clarinda, Iowa, assignor to Lisle Corporation, Clarinda, Iowa, a corporation of Iowa 16 Claims.

This invention relates to cylinder hones, and includes a device of that general nature having a hone body and abrasive members that are expandible and contractible and adapted to engage the surface of the cylinder wall.

A serious objection to previous cylinder ho es had to do with long and short cylinders. A single cylinder hone was not effective for grinding both long and short cylinders.

If a long hone was used on a short cylinder, the inner ends of the abrasive members became more worn than the portions extending out of the cylinder. Moreover, the hone tended to form a bell mouth on the cylinder; there was no resistance to the expansion of the outer ends of the abrasive members, and as a consequence they were expanded more than the inner ends, forming a taper of the abrasive members which caused the bell mouth of the cylinder.

On the other hand, if a short cylinder hone was used on a long cylinder, the whole surface of the cylinder was not evenly ground, leaving ridges.

An object therefore of the present invention is the elimination of the above objection, and the provision of a cylinder hone which is specially adapted to ready interchangeability of long and short abrasive members.

A more specific object is the provision of a novel construction having a central shaft, a pair of chucks or end members on the shaft, one end member being axially movable with respect to the other, and abrasive members supported solely by the end members.

Another objection to revious types of cylinder hones had to do with blind end cylinders. Ordinary cylinder hones are not effective for grinding the inner end of a blind end cylinder. This is caused by the fact that the abrasive members do not extend fully to the inner end of the hone body, due to improper construction of the bone body. Furthermore, on adjusting the hone for expanding the abrasive members, portions of the hone body extend beyond the inner end of the abrasive members in cases where they would not extend beyond the abrasive members in all positions of adjustment. The present objection applies also in the case of a stepped cylinder having portions of different diameters with a shoulder at the juncture thereof.

Another object therefore of the present invention is the elimination of the above objection, and the .provision of a cylinder hone which is specially adapted to grinding blind end cylinders.

A- more specific object is the provision of a cylinder hone having a novel construction in which the entering ends of the abrasive members extend into close proximity to the respective end of the hone body.

Still another object of the invention is the pro vision of a cylinder hone in which the entering ends of the abrasive members extend into close proximity to the respective end of the hone body in all positions of adjustment of the hone.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my device whereby the objects contemplated are attained as hereinafter more fully set forth, pointed out in the claims and illustrated in the accomanying drawings in which:

Figure 1 is an elevational view of the cylinder hone in expanded position;

Figure 2 is similar to Figure 1, showing the hone in retracted position;

Figure 3 is an enlarged longitudinal sectional view of the hone taken on line 3-3 of Figure 5;

Figure 4 is a view similar to Figure 3, showing the hone with short abrasive members therein;

Figure 5 is an end view of the device taken from the top of Figure 3;

Figure 6 is a sectional view taken on line 6-6 of Figure 1;

Figure 7 is a sectional view taken on line s i of Figure 1;

Figure 8 is a view similar to Figure 7, but showing the cylinder hone in a cylinder with the abrasive members biased toward expanded posi tion and engaging the cylinder wall;

Figure 9 is a detail view of one of the abrasive members and taken on line 9-9 of Figure 3;

Figure 10 illustrates the cylinder hone in a short blind end cylinder;

Figure 11 illustrates the hone in the large bore of a stepped cylinder; and

Figure 12 is a view showing a portion oi a modified form, oriented in accordance with the upper left-hand corner of Figure 4.

Referring now in detail to the drawings, the device, as illustrated in Figure 1, includes the hone proper l2 and an adapter I l secured thereto and provided for connecting the hone with a driving tool. The adapter M may be conventional and preferably includes a flexible portion it as is usual in such types of adapters.

The hone proper I2 includes a central shaft :3, which for convenience herein, may also be referred to as a body member because of its function of supporting all of the elements of the hone. The shaft [8 extends beyond the hone atone end 3 where it is provided with threads as indicated at 20. The adapter [4 is secured to this threaded portion by means of a set screw 22 or other convenient means. The shaft Or body member 18 is polygonal in cross section and, as herein illustrated, is hexagonal.

Mounted on the shaft or body member it are a pair of chucks or

end members

24 and 26. The

end members

24 and 26 are similar to each other in construction. Referring first to the end member 24, this member includes a main body portion 28 in the form of a short axis cylinder and is provided with a central hole 30 for receiving the shaft 18. The hole 30 is of the-same cross sectional contour of the shaft so that 'the'end member rotates with the shaft.

An axially extending flange 32' is formed at the periphery of the body member 29 and extends toward the other end member 25. The 'fiange't's is preferably formed integral with the body member -28"and' is formed'by'-=cii tting away a'cen'tral cavity.

A plurality of slots 34 are cut-'in-the hod'y member 28 and flange 32. The slotsh's i aiepreferably three iii-number and'extehd radially of the end-member and terminate -inwardlyin surfaces 36'. The slots 34 are cut'e'ritirely'thron'gh the body member"28"and"open axially through both ends of the end-member; t'h'e slotsthu's opening radially outwardly and axially of the end member.

A plate 38 is 'iitt'edionthe' end member 24 on the side opposite theilan'ge 32. The plate 33 is provided with aperi heral bead 4%! over which is turned a flange 4 2 formed on thebody member 28. The flange "qlz'tliu's clamps the plate 38 securely on the endmeriiberand the plate closes one endoi the slots 34. The plate 38 is provided with a central tapered-holster receiving a reduced portion 44 of 'the shaft l8. The portion 44 is then swaged or peened'to secure the plate 38 imposition. Theendiii-ember24 is thusfixed on theshaft orb'ody memberi8,'both against'axial movement and against'rotation.

The end memberfi'fii's'siniilar in most respects to the end member'24, including thebody'p'ortion 46, flange 48 and sldtsiiil',- the latter having radially inner surfaces 52. -An end plate '51?) is secured in place similarly to the plate 38. The bbdymember 46 is provided \vith a "centralhole 56 for receiving the shaft (8 and is of course of the same cross sectional contour. The plate 54 is provided with arena-a1cpenmgbut n this case the plate is not'fix'edlysecured to the shaft. Thus the end member ZGJis 'fix'edi'aga'inst rotation on the" shaft; but isfree'to move axially thereon.

A 'c'or'npression "spring "58 surrounds the threaded portion'ifl of theshaft and is received ina hollow portion to of aimt G2- tlireaded-:n the threaded portion "20.

The notches 34 and it' will be seen'irorn the above, are spaced bircdinferentially around the end members. The notches'are-"also in "axial alignment rorthere ceptio'no'f abrasive members indicated generally at 64. Each abrasive member :54 includes an elongated channel member 63 whichfm'ay be rectangular in cross section having a; bottom wall '68 (Figureso to 8) and side wallslllq Secured in the channel '66 is an abra- 'sive stone 12. The stone maybe rigidly secured in place by clamping the sidewall 19 thereon.

Substantiallycentrally' of the abrasive member '64 are a pair oflugs 1'4 which may be struck out from the bottom wall68 a indicated in Figure 6. These lugs extend perpendicular to the bottom wall 63 and then inwardly toward each other.

A leaf spring is secured to the channel meniber by means of the lugs it. The leaf spring 16 preferably is provided with notches cut in from its lateral edges to receive the lugs M to prevent longitudinal displacement of the spring or channel. The lugs 14 are then clamped in place over the leaf spring. The channel 66 and spring it are thus connected to each other at a point substantially centrally of each. The ends E8 of the leaf spring 75 are normally biased away from the channel or abrasive member.

Additional lugs 83 are struck out of the channel member K56. These lugs 85 are arranged in pairs and are disposed adjacent the ends of the abrasive member. The lugs 81! are struck out from the side walls F0 andbent down so as to be positioned substantially in the plane of the bottom wall 58 and form lateral projections on the channel 56.

The abrasive members as are inserted in the aligned slots 3:! and 55 as best illustrated in Figure 3. The end member 25 is axially adjustable on the shaft or body member 13 by means of-the nut 62. The end member SS is retracted away from the end member 24' so that thefiang'esxiii and 4e are spaced at least as far "apart as the opposite outside edges of the lugs 83. The'abrasive members 64 are then inserted into the aligned slots so that the ends ES-of the leaf 'springs rest on the surfaces 35 and 5201 the slots. The abrasive members can then be gripped in onehand and compressed radially" inwardly and then the end member 25 is adjusted toward theothere'nd member by turning the nut 62. Theend member 25 is run up toward the'other and member to the position wherein thefl'angest'i and 48 overlie the lugs 89. The abrasive members 6:; are then prevented from falling out of the slots" or being withdrawn therefrom.

In operation the end member 26 can be retracted from the opposite end'member to a position similar'to that shown'in Figure 2 wherein the abrasive members either'retract radially inwardly by themselves or can be retracted by applying pressure by the hand. The hone can then be inserted'eas'ilyiritoa cylinder and'after the insertion of the hone 'theend member 28' is adjusted t'oward the other end member. The ends 18 of the leaf springs are'then engaged' by the plates 33 and Btwhicli bows-the leaf springs and biases them radially outwardly, forcingthe abrasive members radially outwardly intoengagernent with the surface'of the. cylinder wall.

The upper endof the hon 'as seen'in Figures 1 to 4 will be referred to as 'the' entering end. that is, the end which enters the cylinder. The thickness ofthe plate "38 is minor and as a consequence the ends of the abrasive members are in close p'roxi'n'iityto the upper surfaceof'the hone. In the'case-ofblind end cylinders such as illustrated in Figure 10 the abrasive members engage the surface of the cylinder wall to a point closely'adjacentthe closed or-blihd endof the cylinder.

One of the principal advantages of the present invention resides-in that feature wherein different length abrasive-members can be inserted at will. In grindihgblind end cylinders, or the large diameter of s't'e'pped cylinders, it is desirable that th abrasive members be no -l-on-gerthan the length of the cylinder being operated on." lif -the abrasive members are longer than thecylinder thecylinder may be ground properly, 'but the outer ends of the abrasive members whichextend out of the cylinder are not worn down; leaving a ridge between'the outer-and-ihne'r portions. The

abrasive members must then be dressed so that they are uniform on their abrading surfaces. All previously known cylinder hones are objectionable in that they are not readily adapted to quick change of difierent lengths of abrasive members, and hence not as effectively adapted for use with different length cylinders.

In the case of the present invention, various lengths of abrasive members are provided to correspond to the different lengths of cylinders. The abrasive members illustrated in Figure 3 are adapted for emcient operation in the case of a cylinder of the same length, then if a shorter cylinder is to be ground the abrasive members can be removed quickly merely by turning the nut 62 and retracting the end member 26. Then shorter abrasive members, such as illustrated in Figure 4, can be inserted and securedin place as described above. A shorter cylinder can then be honed with the same eificiency and effectiveness as in the case of the abrasive members shown in Figure 3 employed in a longer cylinder.

The abrasive members 68 are given considerable radial movement compared with the axial movement of the end member 26. The axial thrust of the end member 26 is exerted on the ends 18 of the leaf springs and due to the bowing of the leaf spring the abrasive members are thrust radially outwardly a considerable amount relative to the axial movement of the end member 25. This is in contrast with previously known types and devices such as those employing Wedges, etc.

Another important advantage of the invention resides in the fact that the brasive members are supported entirely by the end members 24 and 2%. A simple construction is thus effected. Complicated arrangements of mechanical elements heretofore employed are thus eliminated. The device is strong and rugged. In the rotation of the device, the abrasive members are engaged and supported by the sides of the slots 3% and 59. The rotational thrust is thus not taken up by the leaf springs, the latter being employed solely for biasing the abrasive members radially outwardly.

I wish to call attention to the fact that the ease of interchangeability of the abrasive members is made possible by the simple construction of the hone. Entire abrasive member can be removed bodily and replaced by others by a simple adjustment of the hone. This is in contrast with other types of hones wherein a fixed arrangement is provided and abrasive carriers, such as the channels 66 must be of fixed length. In the present case the length of the hone is determined by the spacing of the end members and the abrasive members are of the same length as such spacing and are carried by the end members. There is no additional construction required for supporting the abrasive members.

Figure 11 shows a stepped cylinder 84 having a small diameter portion 86 and a large diameter portion 88 with a shoulder 90 therebetween. In effect and for purposes of grinding, the large portion 88 is a blind end cylinder. The hone as illustrated in Figure 11 engages the shoulder 90 and it is desired to grind the surface of the large portion 88 to a point as close as possible to the shoulder 99. The device of the present invention accomplishes this purpose effectively.

Figure 12 illustrates a modified form in which the plate 38 is provided with slots 92 in register with the slots 34, which extend radially inwardly a portion of the depth of the slots 3 With this arrangement the ends of the abrasive members can extend through the slots 92 in the end plate while the radially inner portion of the slots 34 are covered to provide thrust surfaces 94 for the ends of the leaf spring. In this Way the ends of the abrasive members at the entering end of the hone can be made to extend fully and entirely to the end of the whole device. However, in the construction previously described it has been found that for all practical purposes the ends of the abrasive members terminate sufficiently close to the entering end of the hone.

While I have herein shown and described certain preferred embodiments of my invention, manifestly they are susceptible of modification and rearrangement of the parts without department from th spirit and scope thereof. I do not therefore wish to be understood as limiting my invention to the precise forms herein disclosed, except as I may be so limited by the appended claims. l

I claim:

1. A grinding tool, comprising, in combination, a body member, a pair of axially spaced end members mounted on said body member, each end member having a radially extending body portion and an axially extending peripheral flange, the flanges on said end members being directed toward each other, said end members having axially aligned, circumferentially spaced slots therein, said slots being cut through said flanges and extending radially into said body portions, and abrasive members mounted in respectively aligned slots, each abrasive member including a stone and being mounted on a leaf spring, the ends of the leaf spring engaging the radially inner ends of the slots, the leaf spring thereby biasing the stone radially outwardly, said abrasive members having lateral projections adjacent their radially inner portions in position for engaging the portions of said flanges defining the slots therein for limiting the radially outward movement of said abrasive members.

2. A grinding tool comprising a stem, a pair of axially spaced end members mounted on said stem, flanges on each end member extending toward the other end member, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members positioned in pairs of aligned slots, each abrasive member being in engagement with a leaf spring, the ends of said leaf spring engaging the inner radial ends of the slots, thereby biasing the abrasive member radially outwardly, and lateral projections adjacent the radial inner portion of the abrasive members, said lateral projections being located between said end members and adapted to engage the radial inner surface of said flanges, whereby the radial outward movement of said abrasive members is limited.

3. A grinding tool comprising a stem, a pair of axially spaced end members mounted on said stem, flanges on each end member extending toward the other end member, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members positioned with their respective ends in aligned slots, resilient bowed leaf springs engaging said abrasive members and biasing said abrasive members radially outward from said slots, lateral projections-intermediate the ends of said abrasive members and adiacentthe radial inner portion of'the abrasive members, said lateral' projections'being located between said end members and adapted to engagethe-radial inner surface of said flanges, whereby the radial out-c ward movement of said abrasive members. is limited," and means on said stemoperatively associated with at least one of said end members for 'varying'the spacing between said' end members.

4. A grinding tool comprising a stem, 2. pair of axially spaced endmembers-mounted on said stem, one of said end members being slida-ble on said stem, flanges on each end member-extending toward the other end member, each end member having a plurality ofcircumferentially spaced slots extending radiallytherein; the slots of said pair of endmembers being aligned, abrasive member's positioned with-their respective ends in aligned slots, eachabrasive member beingin engagement with a leaf spring, the ends of'said leaf spring engaging the inner radial ends of the slots, thereby biasing the abrasive member iradially outwardly, lateral projections adjacent the radial inner portion of: the abrasivemembers, said lateral projections being located between said-end members and adapted to engage the radial inner surface of said flanges, whereby the radial outward movement of said abrasive memhers is limited; andmeansfor varying the spacing between said end members, said last means including the leaf: spring for'biasing the end members-apart, a nut-threaded to said stem, and a springpositioned-between said nut and said slidable endmember.

A grinding tool comprising a-stern, av pair of axially spaced end members-on sai-dstem, flanges on each endimember'extending toward the other end member,'eachend' member having alplurality ofv circumferentially spaced-slots: extending radially therein, the slots of. said pair of end membersbeing: aligned, abrasive members positinned with their respectiveends in aligned slots, each abrasive member being in engagement with a leaf spring, the ends of 'said leaf spring engaging the innerradial ends of 'the slots, thereby biasing: the abrasive member radially outwardly, lateralfprojections'adjacent the radial inner portion of the abrasive "members, saidlateral'projections being loeated between said end members and adapted to engage vthe'radia'lrinner surface of'said-fianges, whereby the radial outward movement of saidabrasive members is limited, outer end plates extending aorosstheouter open ends ofthe slots andzadapted to engage the axial ends ofth'e springs, and meanson said-stem operatively associated with V at least one of said end members for varying the. spacing between said end' members, whereby the force with which the abrasive members are tbrustra-dially outwardly is varied;

6. A grinding toolcomprising astem, a pair of axiallyspaced and members on: said stem, flanges on each end-member extendingtoward the other 'end member, each end :member having a plurality of circumferentially spacedslotsextending radially thereimthe slots of said pair of end members being aligned; abrasive members positioned with theirrespeotive ends in aligned slots, each abrasive memberbeing in engagement with a leaf spring, the ends of said leaf spring engaging the inner radial ends-ofthe slots, thereby biasing the --abrasive member radially outwardly, lateral projections adjacent the radial inner portion of the abrasive membersrsald lat-v era l projections being located between-said end members and adapted to engage the radial-inner surface of said flanges, whereby the radial outward movement of said abrasive members is limited,"outer end plates extending across-the outer open axial ends of the slots and adapted to engage the ends of the springs,- means on said stem operativelyassociated with at least one of said end' members for varying the spacing between said end members, whereby the'force with which the. abrasiv members are thrust radially outwardly is varied, and the projected lengthlof said springs being longer than therespective abrasive members, the ends of said springs engaging said outer end p1ates,and the endsoi said abrasivev members being spaced from said outer end plates, whereby there is no binding therebetween.

7; A grinding tool comprising astem, apair of axially spaced end members on saidv stem, flanges on each end-member extending toward the other end member, each and member having a plurality of circumferentiallyspaced slots extending radially therein, the slots; of-saidpair of" end members being aligned, abrasive members positioned with their respective-ends in aligned slots, each abrasive member being mounted on a leaf spring; the ends of saidleai spring engaging the inner radial ends of the slots, thereby biasing the abrasive; member radially outwardly, lateral projections adjacent-the radial inner portion of the abrasive.membersusai'dlateral' projections being locatedv between: said end members and adapted to engage the radial-inner surface of said flanges, whereby the. radial outward movement of said abrasive members is limited, and outer end lips extending across the outer open axial ends of the slots adjacentrthe radially inner ends or" said slots; saidouter end lips adapted to engage-the axial endsofithe springs, said lips being small enough to leave the greater portion of the slots unobstructed.

8; A grinding tool comprising a stem, a pair of axially spaced end members cnsai-dcstem, flanges on eachencl member extending toward the other end membeneach end member having aplurality of circumferentially spaced slots extending radially therein, the slots of saidpa-ir of end members being aligned, abrasive members: positioned with their respective ends in alignedslots, eachabrasive member being mounted on a leaf spring, the ends of said leaftspring engaging the inner radial ends or the slots, .therebyibiasing the abrasive member radia ly outwardly, lateral projections adjacent the radial'inner portion of the abrasive members, said lateral-;projections. bein located between said end members and adapted to engage the radial inner surface of said flanges, whereby the radial outward movement of said .abrasive'members is limited, outer end lips extending-across the outer open axial ends of the slots adjacent the radially inner ends of: said slots, said outer end lips adapted to. engage the axial ends of the springs, said lips being small enough to leave the greater portion of the-slots unobstructed, and said abrasive members extending axially outwardly of said outer end lips.

9. A grinding-tool comprising a'stem, ,arpair of axially spaced end members on said stem, the first of said pair of end members being fixed; on one end-0f said stem, flanges oneach endmember extending toward the other endmember, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end membersbeingaligned,

abrasive members positioned with their respective ends in aligned slots, each abrasive memher being mounted on a leaf spring, the ends of said leaf spring engaging the inner radial ends of the slots, thereby biasing the abrasive member radially outwardly, lateral projections adjacent the radial inner portion or" the abrasive members, said lateral projections being located between said end members and adapted to engage the radial inner surface of said flanges, whereby the radial outward movement of said abrasive members is limited, outer end lips extending across the outer open axial ends of the slots adjacent the radially inner ends of said slots, said outer end lips adapted to engage the axial ends of the springs, the outer end lips on said first end member being small enough to eave the greater portion of the slots unobstructed, and said abrasive members extending axially outwardly of said outer end lips on said first end member.

10. A grinding tool comprising a stem, a pair oi axially spaced end members on said stem, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members positioned with their respective ends in aligned slots, each abrasive member being in engagement with a leaf spring, the ends of said leaf springs engaging the inner radial ends of the slots, outer end plates extending across the outer open ends or" the slots and adapted to engage the ends of the springs, means on said stem operatively associated with at least one of said end members for varying the spacing between said end members, whereby the force with which the abrasive members are thrust radially outwardly is also varied, the projected length of said springs being longer than the respective abrasive members, the ends of said springs engaging said outer end plates, and the ends of said abrasive members being spaced from said outer end plates, whereby there is no binding therebetween.

11. A grinding tool comprising a stem, a pair of axially spaced end members on said stem, the first of said pair of end members being fixed on one end of said stem, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end mem- I bers being aligned, abrasive members positioned in pairs of aligned slots, each abrasive member being mounted on a leaf spring, the ends of said leaf springs engaging the inner radial ends of the slots, outer end lips extending acros the outer open axial ends of the slots adjacent the radially inner ends of said slots, said outer end lips adapted to engage the axial ends of the springs, means on said stem operatively associated with at least one of said end members for varying the spacing between said end members, whereby the force with which the abrasive members are thrust radially outwardly is varied, the lips on said first end member being small enough to leave the greater portion of the slots unobstructed, and said abrasive members extending axially outwardly of said outer end lips on said first end member.

12. A grinding tool comprising a stem, a pair of axially spaced end members on said stem, at least one of said end members being movable axially along said stem toward and away from the other end member to accommodate a plurality of abrasive members of varying lengths, said end members being non-rotatable with respect to said stem, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members, positioned in pairs of aligned slots, saidabrasive members being of substantially uniform cross-section along their entire length, resilient means biasing said abrasive members radially outward from said slots, means including elements on said abrasive members and elements on said end members-cooperating with each other to limit the radially outward movement of said abrasive members with respect to said end members, elements extending from said abrasive members engageable with said end members for limiting axial movement of said abrasive members with respect to said end members, and said abrasive members extending through the entire axial length of the slots in at least one of said end members and extending axially outward of said one end member, whereby said grinding tool is adapted to be applied to surfaces spaced axially outward or said one end member when said tool is in its operative environment.

13. A grinding tool comprising a stem, a pair of axially spaced end members on said stem, said end members being non-rotatable with respect to said stem, each end member having a plurality or circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members positioned in pairs of alignedslots, leaf springs in engagement with each abrasive member for resiliently biasing said abrasive members radially outwardly, outer end lip extending across the outer open axial ends of the end member slots adjacent the radially inner ends of said slots, the axial ends of said leaf springs engaging said outer end lips, at least one of said end members being movable axially along said stem toward and away from the other end member to accommodate a plurality of abrasive member of varying lengths, means including elements on said abrasive members and elements on said end members cooperating with each other to limit the radially outward movement of said abrasive members with respect to said end members, elements extending from said abrasive members engageable with said end members for limiting axial movement of said abrasive members with respect to said end members, and said abrasive members extending through the entire axial length of said slots in at least one of said end members and outwardly of the lips on said one end member.

14. A grinding tool comprising a stem, a pair of axially spaced end members on said stem, said end members being non-rotatable with respect to said stem, each end member having a plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end member being aligned, abrasive members positioned in pairs of aligned slots, leaf springs in engagement with each abrasive member for resiliently biasing said abrasive members radially outwardly, outer end lips extending across the outer open axial ends of the end member slots adjacent the radially inner ends of said slots, the axial ends of said leaf springs engaging said outer end lips, at least one of said end members being movable axially along said stem toward and away from the other end member to accommodate a plurality of abrasive members of varying lengths, flanges on each end member extending toward the other member lateral projections adjacent the radial inner portion of the abrasive members and losated between said end members, said projec tions adapted toengage the radial inner surface of said flanges, whereby the radial outward movement of said abrasive members is limited, and said abrasive members extending through the entire axial length of said slots at least one of said end members and outwardly of the lips on said one end member.

15. A grinding tool comprising a stem, 2, pair of axially spaced end members on said stem, said end member being non-rotatable with respect to said stem, each end member having a plurality of circumferentially spaced slots extending. radially therein, the slots of said pair of end members being aligned, abrasive members positioned in pairs of aligned slots, leaf springs in engagement with each abrasive member for resiliently biasing said abrasive members radially outwardly, outer end lips extending across the outer open axial ends of the end member slots adjacent the radially inner ends of said slots, the axial ends of said leaf springs engaging said outer end lips, at least one of said end members being movable axially along said stem toward and away from the other end member to accommodate a phirality of abrasive members'of varying lengths, lateral projections adjacent the radial inner portion of the abrasive members and located between said end members, said lateral projections adapted to engage the axial innn'er surface of said end members, whereby axial movement of said abrasive' members with respect to said end members is limited, and said abrasive members extending through the entire axial length of said slots in'at least one ofsaid end members and outwardly of the lip on said one end-member;

16. A grinding tool comprising astem, a pair of axially spaced end members mounted on said stem-each end member havinga plurality of circumferentially spaced slots extending radially therein, the slots of said pair of end members being aligned, abrasive members positioned in pairs of aligned slots, resilient means biasing said 1'2. abrasive members radially outwardrof-said slots, means including elements on said abrasive members and elements on said endmembers cooperating to limit the radially outward movement of said abrasive members, at least one of said end members being slidably. mounted on said stem and movable axially along said stem toward and away from the other end member, resilient means applying forces to opposite sides of said one end member in opposite axial directions, the reaction force of said resilient means being transmitted to said stem, and means restricting rotation of said end members relative to each other, said means comprising a portion of said stem having a polygonal cross-section, and said end members having apertures" of polygonal cross-section adapted to receive therethrough said polygonal portion of the stem.

THOMAS E. BROOKS.

REFERENCES CITED The following-references are of record in the file of this patent:

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