US1134508A

US1134508A - Grinding and polishing machine.

Info

Publication number: US1134508A
Application number: US82728414A
Authority: US
Inventors: John C Blevney
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-03-26
Filing date: 1914-03-26
Publication date: 1915-04-06
Anticipated expiration: 1932-04-06

Description

J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26. I914. 1,134,508, Patented Apr. 6,1915.

5 SHEETS-SHEET 1,

INVENTOR flnhqCIElw a BY 5W /5 E l W ATTORNEYS I. C. BLEVNEY.

GRINDING AND POLISHINGMAC HINE. APPLICATION HLED MAR. 26, 1914.

1 1 34,500 Patented Apr. 6, 1915.

6 SHIBETSSHEET 2.

INVENTOR ATTORNEYS WITNESSES:

.l. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION, FILED MAR. 26. 1914.

Patented Apr. 6, 1915.

5 SHEETBSHEET 3.

J a j; 25 2 s5 xiii? 2? 47%? L? 7 35 33 1:5: I| I i I-- L I J4 WITNESSES: 6 f? 3/ 37 INVENTOR %Z qflDhZg/DBIIEW ,g h nhwgl v imywuw ATTORNEYS J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26, 19.14.

1 1 84,5089 Patented Apr. 6, 1915.

5 SHEETS-SHEET 4.

WITNESSES: INVENTOR 'ILI II hr [IL B12112 fwfi/XQM. W

ATTORNEYS J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26. I914.

L1 Patented Apr. 1915.

5 SHEETS-SHBET 5.

WITNESSES: INVENTOR S fluhr EEIEYI E QM X K M, .zwg/ qw AT ORNFYS JOHN C. BLEVNEY, 0F NEWARK, NEW JERSEY.

GRINDING AND POLISHING- MACHINE.

memos.

Specification of Letters Patent.

Application filed March 26, 1914. Serial No. 827,284.

To all whom it may concern:

Be it known that I, J OHN G. BLnvNEY, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Grinding and Polishing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as w1 ll. enable others skilled in the art to which it appertains to make and use the same, reference being had to the accom anying drawings, and to characters of re erence marked thereon, which form a part of th1sspec1fication.

This invention has reference, generally, to improvements in grinding and polishing machinery; and the said invention relates, more particularly, to a novel construction of machine for grinding and polishing the rough uneven surfaces of metal castings, and the like.

The invention has for its principal object to provide an eflicient construction of apparatus adapted to automatically grind and.

polish the rough uneven surfaces of metal castings, and the like, to provide the same with an apparently smooth evenly finished surface, without, however, unduly grinding off the high spots or points forming the surface inequalities of the said castings, so that said castings are weakened or rendered too thin by the loss of metal. To accomplish this end I provide a novel means for pressing the abrading elements of the machine in contact with all portions of the area of the unequal surface of the castings with substantial uniformity.

Another object of the present invention is to provide a novel means for feeding the castings in contact with the abrading elements of the machine, so that the casting is moved laterally across the faces of the abrading elements, and at the same time I provide for a corresponding relative movement of the means for pressing the abrading elements to the surfaces of the casting. I

'A still further object ofthe invention is to provide, in connection with the novel work feeding means, devices whereby the movement of the work is accelerated, in ad- 'justable ratios, with relation to the movedefined and described in the following specification.

Other objects of the present invention, not at this time more particularly enumerated, will be clearly understood from the following detailed description of this invention.

With the various objects of the present invention in view, the same consists, primarily, in the novel grinding and polishing machine hereinafter set forth; and, the invention consists, furthermore, in the novel arrangements and combinations of the several devices and parts, as well as in the details of the construction of the same, all of which will be more fully described in the following specification, and then finally embodied in the claims which are appended to and which form an essential part of the said specifications.

The invention is clearly illustrated in the accompanying drawings, in whichz- Figure 1 is a front elevation of the grinding and polishing machine made according to and embodying one form of my present invention. Fig. 2 is a vertical longitudinal section of the same, taken on line 22 in said Fig. 1. Fig. 3 is a detail vertical section similar to said Fig. 2, but confined more especially to the work feeding mechanism and associated parts, said view being drawn on an enlarged scale, and the limit of the operative movement of the various parts therein illustrated being indicated by dotted 'line representation. F ig. 4 is a detail transverse section taken on line 4:4 in said Fig. 3, looking in the direction of the arrow as; and Fig. 5 is a detail horizontal section taken on line 55 in said Fig. 4, looking downward; the limit of the operative movement of the various parts illustrated in both Figs. 4 and 5 being indicated by dotted representation in said respective views. Fig. 6 is a detail longitudinal vertical section of one of the devices comprising the. means for pressing the abrading elements of the machine to the work. Fig. 7 is a view similar to that shown in Fig. 5, but illustrating a slightly modified construction and arrangement of the means for pressing the abradin elements of the machine to the work.

Similar characters of reference are employed in all of the hereinabove described views, to indicate corresponding parts.

Referring now to said drawings the reference character 1 indicates the base of the Patented Apr. 6, 31915.

novel grinding and polishing machine form,- ing one embodiment of my present invention, the same being provided upon its sides with transverse guide-channels 2. Mounted upon said base 1 are a pair of laterally movable standards 3, the lower, ends of which are provided with retaining-plates 4, which ride in said guide-channels 2, and which, while permitting the lateral movement of said standards 3 upon the base 1, prevent any displacement of the same from said base 1.

Journaled in the lower portion of each standard 3 are shafts 5. One of said shafts 5 is provided with a driving pulley 6. Secured upon the forwardly projecting end of each shaft 5 is a pulley-whee1 7. The respective pulley-wheels 7 must preferably be drawn in opposite directions, and while each could be driven separately to accomplish this end, I prefer to use the following driving means. The shaft 5 which is driven by the driving pulley 6'is provided with a pulley 8 over which runs the belt 9. Said belt is carried over a pulley 10 mounted rotatably within said base 1, thence passing over a pulley 11 whichis journaled in movable bearings 12 secured within said base 1, thence over a pulley 13 connected with the other of said shafts 5, thence being carried over a pulley 14 mounted rotatably within said base 1, thence over a pulley 15 which is journa'led in movable bearings 16 secured within said base 1, and thence returning over the said pulley 8. The said belt 9 is twisted in' those portions of its stretches which extend between the pulleys 10 and 11 and the

pulleys

14 and 15, so that said stretches of the belt will pass each other without interference. By such an arrangement it will be apparent that the driven,

shaft 5 will transmit its rotation to the other shaft 5, the rotation of the latter beingreversed, so that the respective pulley-wheels 7 will be driven in opposite directions.

The reference character 17 indicates pulley wheels which are rotatably journaled in movable bearingmembers 18 which arerespectively mounted in connection with the respective standards 3.

The reference character 19 indicates pulley-wheels which are rotatably journaled in movable bearing members 20 which are respectively mounted in connection with the respective standards 3.

The reference character 21 indicatesbacking belts having transversely grooved outer faces, the same respectively running over the

pulley wheels

7 and 17 of each standard 3.

he reference character 22 indicates abrading belts, the outer surfaces of which are provided with a covering of some suitable abrading material such as carborundum emery or the like. The said abrading belts 22 extend over the pulley wheels 19 of each standard so as to pass around and over the opposite directions, and in turn drive saidabrading belts 22, which they back, also in opposite directions. The

respective pulley wheels

7 and 17 of each standard 3 are so arranged and alined relatively to one an other that the inner stretches of said back ing belts, and that portion of said abrading belts riding upon said inner stretches, are caused to run parallel to each other, the abrading surfaces of the respective abrading belts facing each other so that a casting or other work to be ground may be inserted therebetween so that the opposite faces of the same are simultaneously operated upon by said abradingbelt s. Since the sizes and thicknesses of the castings desired to be ground may be various it is of course necessary to mount the respective abrading belts so that the distance between their paralleling surfaces may be varied to properly accommodate the size of casting to be operated upon, and to this end said standards 3 are made movable upon said base 1, as above inprovided with a pair of bearing blocks 24.

Journaled in and extending between oppositely facing bearing blocks 24 are a pair of supporting shafts 25 and 25' from which depend pairs of parallel lever-

members

26 and 26'. Connected pivotally with the lower ends of said lever-

members

26 and 26 by means of bolts 27 is a carrier table 28. By

reason of its supportby the parallel levermembers said carrier table 28 is always maintained in a level horizontal position even during the forward swinging movement of the same as controlled by said levermembers.

Various forms of work holding devices may be secured upon said carrier table 28 each being suited to the shape of the work to be operated upon. In the drawings, as an example of one of such work holding de vices, I have illustrated a work holding means adapted to carry a casting such as a wrench-frame for Stillson wrenches, the same comprising an angle-plate or bracket 29, the same being secured upon said carrier table by means of anchor-bolts 30, the heads of which are secured in one of a plurality of inverted T shaped grooves 31, which extend transversel across said carrier table. face of sai angle-plate or bracket 29 is provided with a pair of yoke-pieces 32 through The I memos the openings of which extends a movable carrier-arm 33. Said carrier-arm is slidable in said yoke-pieces toward the abrading belts 22, and the same is provided with a stop-pin 34, which engaging one of said yoke-pieces limits its inwardly pushed movement. When pushed inward said carrierarm is locked against any backward or outward movement by means of a notch or cutaway portion 35, which is provided in its upper marginal edge, and which receives the upper portion of one of said yoke-pieces. Said carrier-arm being so constructed that its inner end overbalances its outer end, its notch or cutaway portion 35 is caused to embrace said yoke-piece by the upward tilting of the outer end of said carrier-arm. When it is desired to release the carrier-arm from such locked position its outer end is merely pushed downward to disengage said notch or cutaway portion from its embracing position, whereupon the carrier-arm may be drawn backward or outward. The inner end of said carrier-arm is properly formed to conform to the wrench-frame 36, so that the latter may be dropped upon said inner end of the carrier-arm and there held against any longitudinal movement upon said carrier-arm. When said

parallel levermembers

26 and 26' are swung inwardly it will be apparent that the inner end of said carrier-arm, upon which is mounted the wrench-frame 36, will be moved inward and will thereupon carry the latter between and in contact with the respective abrading belts 22. This inward swinging movement of said parallel lever-

members

26 and 26 is accomplished by means of the following system of counterbalanced. operating levers, comprising a fulcrum link 37 the inner end 4 of which is pivotally connected with a stud 38 which projects from the inner side of one of said standards 3. The said fulcrum link extends outwardly between said pairs of parallel lever-

members

26 and 26, and pivotally connected with the same, so as to be fulcrumed upon its free end is a hand-lever 39, from which extends outwardly an arm 40. Pivotally connected with the free end of said arm 40 is a link-member 41, which extends inwardly, so that its inner end is pivotally connected with one end of a counter-balance lever 42, the latter being fulcrumed upon said stud 38, and having adjustably fixed upon its opposite end a counter-balance weight 43. Connected with and extending transversely between said levermembers 26 of said parallel lever-members is a cross-bar.44 having perforations 45 carry the carrier-table and work holding device connected therewith inwardly toward said abrading belts 22. -The weight of said parallel lever-members and the parts connected therewith is counter-balanced by the c0unter-balance lever 42 and the weight 43 connected therewitln'and which is synchronously operated in proper directions by the movement of said link-member 41 with which they are connected.

Secured to the inner side surface of each standard 3 is a guide-member 47 in which is slidably disposed a carrier-bar 48. Secured to the free end of each carrier-bar 48 is a bracket-member 49 to which are pivotally connected pairs of parallel suspending levers 50 and 50'. Pivotally secured between the lower free ends of said parallel suspending levers 50 and 50.- are carrier-plates 51. The said carrier-bars 48 and said carrierplates 51 thus suspended therefrom, are so disposed as to be presented in a plane behind the inner stretches of the superimposed portions of said backing belts 21 and abrading belts 22. Mounted upon each carrier-plate 51, and conveniently afiixed thereto, are devices adaptedto be moved into contact with area of their pressing or contacting ends conform substantially both to the outline and area of the surface of the casting or other work against which they are designed to press the abrading-belt 22, as backed by the backing-belt 21. Each pressing-finger 53 is provided at its inner end with a tailpiece 55 of substantially reduced cross-sectional area with relation to the cross-sectional area of the main body of the said pressing-finger. Secured within said framework 52 is a resilient element, preferably in the form of a block of soft rubber 56, against which the ends of said tail-pieces 55 contact to resiliently or yieldingly back said pressing-fingers 53. Each pressing-finger 53 is further provided with a suitably dis-r posed cutaway-portion 57 which embraces a companion stop-member 58 for each pressing-finger, which stop-members are suitably afiixed in stationary relation to said framework 52, and since said cutaway-portions 57 are longer than thewidth of said stopmembers a limited longitudinal movement of' said pressing-fingers 53 is permitted without permitting the same to be disconnected from their properly associated relation with said frame-work 52. c

Aflixed to the outer ends of each carrierplate 51 is a cam-plate 59 the outer. edge of which forms an outwardly curved cam-portion 60.

The reference character61 indicates adjustable yoke-members which are adjustably related to the said parallel lever-

members

26 and 26. Connected with, and extending between said yoke-pieces 61 is a cross-bar 62. Each carrier-bar 18 is provided with a stud 63, and interconnecting each stud 63 with said cross-bar 62 are connecting-links 6 1,

the same having a plurality of notches 65 adjacent to each end thereof, which may be selectively engaged respectively with said studs 63 and said cross-bar 62 to properly position said pressing devices carried by said carrier-bars 48 relatively to said work carrying) devices carried by said

parallel levermem ers

26 and 26', so that a simultaneous inward movement toward said abrading elements of all said parts may be caused by the inward swinging movement of said parallel lever-

members

26 and 26. The normal positions of said carrier-plates 51, as supported by said suspending

levers

50 and 50, and

consequently of said pressing devices carried by said carrier-plates 51, are such that the free ends 5 1 of the pressing-fingers 53 are normally removed from the plane of said superimposed stretches of said backing and abrading belts, these positions being determined by stop-members 66 which are secured to each bracket-member 49, and against which the suspending-levers 50 50 are brought to rest when said carrier-plates 51 and the pressing devices mounted thereon, are free, under the force of gravity, to swing away from said belts.

The reference character 67 indicates baseplates which are respectively secured to the forward faces of said standards 3 in suitable locations. Secured to each base-plate is an outwardly extending bracket 68. Fulcrumod in the free end of each'bracket 68 is a pressure lever 69. Each bracket 68 is provided on one side with a downwardly extending wall or flange 70, having a suitably disposed opening or perforation'71 therein. The tail 72 of said pressure lever 69 is stopped against said wall or flange 70, thus fixing its normal position. Pivotally connected with said tail 72 of said pressurelever 69 is a rod 73 which extends through the opening or perforation 71 of said wall or flange and which is thus caused to extend outwardly therefrom. The free end of said rod 73 is screw threaded so as to receive thereon lock-nuts 74. Arranged upon said rod between said lock-nuts 74 and said wall or flange 70 is a pressure spring 75. With said Wall or flange 70 as a base and said locknuts as a point of purchase said pressure spring 75 exerts an outwardly moving pressure upon said rod 73 and consequently upon said pressure-lever 69, thereby normally maintaining the latter in its stopped position with its tail 72 against the inner side of said wall or flange 7 0, and its outer free end projected into the path of said cam-plate 59 connected with each of said carrier-plates 51. Said outer free end of said pressure-lever 69 is provided with an anti-friction roller 76. When said carrierplates 51 are carried inward by the inwardly swinging movement of said

parallel levermembers

26 and 26, as above described, the cam-plates 59 are moved into contact with the anti-friction rollers 76 of said pressure-' levers 69, and as this inward movement is continued the cam-portions 60 ride upon said anti-friction rollers 76. The result of this movement is to cause a forward swinging movement of said carrier-plates 51, as suspended by said suspension levers 50 and 50, toward the superimposed stretches of said backing and abrading belts, so that by the time the work enters between the opposed operative surfaces of the abrading belts the said pressing devices carried by said carrier plates 51 are moved inwardly" whereby the free ends 54: of the pressingfingers are brought into contact with the back of thesuperimposed stretches of said backing and abrading belts. It will be apparent that when the pressing devices are thus brought into contact with the said backing and abrading belts, the same are held yieldingly in contact with the said belts by reason of the tension or pressure of said pressure-springs 75, as transmitted to said carrier-plates 51 and the pressing devices su ported thereon by the pressure-levers 69; this yieldable condition being in addition to the resilient backing of the individual pressing-fingers 53, asalready above described. Owing to the interconnected relation of said carrier-bars -48 with said

parallel levermembers

26 and 26, the pressing devices suspended from said carr1er-bars 48 will move inwardly simultaneously with the inward movement of the work to be operated upon as carried by said carrier-table 28 and the work-supporting devices mounted thereon, but since the means interconnecting said carrier-bars 48 with said parallel lever-memmemos and the cross-bar 62 connected therewith,

are secured-to said parallel lever-

members

26 and 26 at points between the extremities of said lever-members and their fulcrums, it follows that the radius of the arc of movement of said yoke-members 61 and cross-bar 62 is shorter than the radius of the arc of movement of said carrier-table 28, consequently upon the inward swinging movement of said parallel lever-

members

26 and 26, the distance of travel of said pressing devices relative to the distance of travel of said work to be operated upon will ,be less than the latter. The work as it passes between the abrading elements is also given a slight vertical movement relative to the pressing devices, and this is by reason of the fact that the table 28 swinging on said

parallel lever members

26 and 26 describes a descending arc, which not only causes the work to be carried laterally across the abrading surface of the abrading elements but also vertically moves the work as well. This vertical movement of the work is relative to the pressing members since the latter, being supported by said carrier-bars 48 do not move vertically but only laterally across the abrading elements. The ratio of the respective lateral movements of said pressing devices and the work to be operated upon as thus accomplished is subject to adjustment by reason of means for securing said yoke-members 61 in various positions in con-' nection with said lever-

members

26 and 26, whereby said yoke-members 61 and crossbar 62 may be positioned nearer to or farther away from the fulcrums of said levermembers. This means of adjustment comprises the provision in said parallel levermembers of a pluralitv of longitudinally disposed perforations or openings 77, and in the provision of longitudinally disposed perforation or openings 78 in the vertical portions of said yoke-members 61. Any selected opening or perforation 78 may be registered with any of said openings or perforations 77 whereby the desired distance of said yoke-members61 and cross-bar 62 from the fulcrums of said lever-members, relative to the distance of the work as supported by said carrier-table 28 on work sup porting devices suspended by said levermembers, may be secured. When the yokemembers 61 are thus positioned fastening screws or pins 79 may be inserted through the said registered openings or perforations. As previously mentioned the said standards 3 are movable laterally away from or -toward each other for the purpose of properly spacing the superimposed stretches of said backing and abrading belts from each other so that the latter will be properly spaced to accommodate the width of the work to be inserted therebetween. It follows that any 5 adjustment of said standards 3 will require members may be moved laterally to a proper adJusted position. When thus properly positioned the said

shafts

25 and 25 are retained against further longitudinal movement by means of a pair of stop-collars 80 which are positioned on opposite sides ofcertain of said bearing-blocks 24:, and then looked upon said shafts.

Having thus described the general construction of the various devices and detailed parts comprising the novel grinding and polishing machine embodying the principles of my invention, it remains to describe the operations, uses, and advantages of the same. The said novel grinding and polishing machine is adapted to be used to finish the surfaces of rough castings, and the like. The surfaces of such castings are usually rough and contain in their surface area inequalities comprising high and low spots, which are due to unequal shrinkage of the metal when cooling, and to warping and similar causes. It is desirable to so grind such surfaces as to not only smooth off the roughness of the surface but to eliminate the appearance of these inequalities, so that said surfaces appear even, level and smooth even while the inequalities comprising the high and low spots remain. But this finished appearance must be accomplished without grinding down said high spots to the plane of said low spots of the surface of said castlng, since such method would tend to weaken the casting. To accomplish the desired result I provide the novel pressing devices whereby the abrading belt is pressed with substantial uniformity upon all points of the area of the surface to be ground, and at the same time by moving the work, while in contact with the abrading belts relatively to the ends of the pressing fingers 53, so that the latter do not press the abradingbelts against only a given portion of the surface of the work, but rather ride in and out of the inequalities of the surface. Such action of the fingers 53 is obtained by providing the different ratios of traveling movement of the work and pressing-devices as accomplished by the inward movement of said parallel lever-

members

26 and 26 in the manner above described.

As illustrative of the character of the work adapted to be operated upon by my machine, I have selected as an example a wrench-frame 36, such as forms a part of the usual construction of Stillson-wrenches.

The said wrench-frame 36 is mounted upon the end of the c rrier-arm 33, which'is then thrust to its inwardly moved position. The hand-lever 39 is then pulled downwardly to swing inwardly the

parallel lever members

26 and 26, which causes the in-' ward movement of said carrier-table 28 and said carrier-arm 33, thereby inserting said wrench-frame 36 between the opposed faces of said abrading-belts 22. As the wrenchframe 36 passes between the abrading-belts 22, the pressing devices are also moved inwardly, and operating in the manner above described are simultaneously forced toward said superimposed stretches of said backing and abrading belts. The pressing-fingers 53 thereupon engage the backing-belts 21 and press the same, and the abrading belts 22 imposed thereon, against the side surfaces of the wrenchrframe 36. A continued movement of said lever-members-26 and 26( will then move the wrench-frame across the abrading surfaces of the belts 22, and this movement is followed by a corresponding movement of the pressing-fingers 53. But since the arc of travel of said pressing-fingers 53 is less than the arc 'of travel of said work or wrench-frame 36 (as already above described), the latter travels faster across the belts than the former, consequently its surfaces are constantly shifting in'advance of or across the abrading belt as pressed forward by said pressing-fingers 53, so that the latter, in effect, cause said abrading belts to ride in and out of the hollows or low spotssof the casting or surface of the wrench-frame 36, and consequently the moving abrading belt contacts with substantial. uniformity with all portions of the surface area of said wrench frame, rendering the lines of abrasion on said surface continuous, even and uniform, so that to all appearance the sur ace of the castingor wrench frame 36 is seemingly level and even. lever-

members

26 and 26 withdraws'said wrench frame 36 from contact with the abrading belts 22, and the samemay be removed from the carrier-arm 33, and another wrench-frame replaced thereon for a repetition of the above described oper- A reverse movement of the,

are provided with laterally disposed housing-portions 82 in which are slidably disposed the tail-portions 83 of pressing-members 84. Secured to the ends of said tailportions 83 are the cam-plates 59 provided with the cam-portionsGO. The said pressing-members 8e are normally registered opposite the work 85 carried by the carrierarm 33 of the work-holding means. When the said table 28, as supported by said parallel lever-

members

26 and 26', is moved inwardly toward said abrading elements the work 85 is carried between said abrading elements 22, and the pressing-members 84 are carried in back of said abrading elements. Simultaneously said cams 60 of said camplates 59 contacting with the rollers 76 of the spring actuated pressure-levers 69, the pressing members are caused to move in contact with the abrading elements forcing the same in contact with the work 85, this contact being yieldable by reason of the spring contact 'of said pressure-levers 69. Since the pressing-members 84 are mounted in connection with said table 28 it will be apparent that the same are caused to move simultaneously with the work and laterally across the abrading elements uniformly with the work. For certain classes of work this arrangement and operation is more desirable than the ar- .rangement and operation of the heretofore I struction.

As many changes may be made in the above described construction of my invention and its detail parts, and many apparently widely different embodiments of my invention could be made without departing from the scope thereof, I intend that' all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. I desire it also understood that the language used in the following claims is intended to cover all generic and specific features of the invention herein described, and all statements of the scope of the invention, which, as a matterof language, might be said to fall therebetween. Hence, I do not-limit my present invention to the exact arrangements and combinations of the devices and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts, as illustrated in the accompanying drawings.

1. In a device of the class described, an abrading means, means for feeding the work to be ground in contact therewith, means for pressing said abrading means to the work, and means for causing said pressing means to travel with the work while the .pressing said abrading means to the work,

said pressing means having a pressing'surface of substantially the same conformation and outline as the surface of the work to be ground, and means for producing simultaneous accompanying lateral movements of said pressing means and said work while respectively in contact with opposite sides of said abrading means.

3. In a device of the class described, an abrading means, means for pressing said abrading means to the work, and means for producing variable relative lateral movements of said pressing means and said work while respectively in contact with opposite sides of the abrading means.

i. In a device of the class described, an abrading means, means for feeding the work to be ground in contact therewith, means for pressing said abrading means yieldingly to the work, means for synchronously moving said pressing means into operative contact with said abrading means upon the introduction of the work to the latter, and means for producing variable relative lateral movements of said pressing means and said work while respectively in contact with opposite sides of said abrading means.

5. In a device of the kind described, abrading'means adapted to engage opposite sides of a piece of work, a carrier table provided with work holding means, parallel lever members upon the free ends of which said carrier-table is suspended, means for swinging said parallel lever members toward and away from said abrading means' to feed the work laterally across and in contact with said abrading means, movable means for pressing said abrading means to the work, means for holding said pressing means yieldingly against the backs of said abrading means, and

connecting said pressmg means with said parallel lever members whereby a greater or less proportional lateral movement of said pressing means relative to the lateral movement of said work is produced.

6. In a device of the class described, abrading means adapted to engage opposite sides of a piece of work, means for pressing said abrading means to the work, a work holding means, and means for controlling the movements of said pressing means and said work holding means whereby the work and said pressing means are caused to travel laterally across the abrading means while respectively in contact with opposite sides of said abrading means.

7. In a device of the class described, abrading means adapted to engage opposite means for adjustably sides of a piece of work, means for pressing said abrading means to the work, means for forcing said pressing means yieldingly in engagement with said abrading means, a work holding means, and means for synchronously controlling the movements of said pressing means and said work holding means whereby the work and said pressing means are caused to travel laterally across the abrading means while respectively in contact with opposite sides of said abrading means.

8. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same, a work holding means, means for moving said work holding means to carry the work to and move the same laterally between said abrading belts, and means movable toward the backs of said abrading belts for pressing said abrading belts against said work while the latter moves in contact with the former.

9. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same, means for feeding the work to be ground between and laterally across the faces of the same, means for pressing said abrading belts to the work, and means interconnecting said pressing means with said work feeding means whereby said pressing means are moved laterally across the rear sides of said abrading belts synchonously with the movement of said work laterally between and in contact with said abrading belts.

10. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same, means for feeding the work to be ground between and laterally across the faces of the same, means for pressing said abrading belts to the work, means interconnecting said pressing means with said Work feeding means whereby said pressing means are moved laterally acrossthe rear sides of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts, and

means for adjusting the interconnected rework and disposed at right angles to the plane of said abrading belts, and a resilient means engaging the rear ends of said pressing-fingers, a carrying means for supporting said frame-work and its pressing-fingers, means engageable by said carrying means for moving the latter toward the backs of said abrading belts and holding the same yieldingly with relation to said abrading belts, and means interconnecting said carrying means with said work feeding means whereby said pressing-fingers carried thereby are moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts. I

12. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same, means for feeding the work to be ground between and laterally across the faces of the same, means for pressing said abrading belts to the work comprising, a frame-work, longitudinally and independently movable pressing-fingers mounted in said frame-work and disposed at right angles to the plane of said abrading belts, and a resilient means engaging the rear ends of said pressingfingers, a carrying means for supporting said frame-work and its pressing-fingers, means engageable by said carrying means for moving the latter toward the backs of said abrading belts and holding the same yieldingly with relation to said abrading belts, means interconnecting said carryingmeans with said work feeding means whereby said pressing-fingers carried thereby are I moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts, and means for adjusting the interconnected relation of said carrying means with said work feeding means whereby the ratio of the lateral movement of said pressing-fingers may be varied with relation to the lateral movement of said work.

13. In a device of the class described, a base, a pair of standards movable upon said base, each standard having means for mounting an abrading belt, said abrading belts being mounted with their inner stretches facing each other,-means for driving said abrading belts, a carrier-table provided with work holding means, means for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of the same, means for pressing said abrading belts to the work, means for forcing said pressing means yieldingly in engagement with said abrading belts, and means for synchronously controlling the movements of said pressing means and said carrier table whereby the work and said pressing means are caused to travel laterally across the abrading belts while respectively in contact with opposite sides of said abrading belts.

l4. In a device of the class described, a v pair of oppositely facing abrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, and parallel lever members for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts. I

15. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, parallel lever members for suspendmg said carrier-table so that the same may 35 be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for pressing said abrading belts to the work, and means interconnecting said pressing means with said parallel lever members whereby said pressing means are moved laterally across the rear sides of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts.

16. In a device of the class described, a pair of oppositely facing abrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, parallel lever members for suspending said carrier-table so that the same may work laterally between and in contact with said abrading belts, and means for adjusting the interconnected relation of said pressing means with said parallel lever-members whereby the ratio of the lateral movement of said pressing means may be varied with re vlation to the lateral movementof said work.

17.,In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket members projecting from said standards, a lateral shaft journaled in said bracket members, parallel lever members depending from said shaft for suspending said-carrier-table 1 so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, and means for controlling the movements of said parallel lever members.

18. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away rom each other, a carrier-table provided with work-holding means, bracket-members projecting from said standards, a lateral shaft journaled in said bracket members. parallel lever members depending from said shaft for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for controlling the movements of said parallel lever members, means for pressing said abrading belts to the work, and means interconnecting said pressing means with said parallel lever members whereby said pressing means are moved laterally across the rear sides of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts.

19. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket members projecting from said standards, a lateral shaft journaled in said bracket members, parallel lever members depending from said shaft for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for controlling the movements of said parallel lever members, means for pressing said abrading belts to the work, means interconnecting said pressing means with said parallel lever members whereby said pressing means are moved laterally across the rear sides of said ahrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts, and means for adjusting the interconnected relation of said pressing means with said parallel levermembers whereby the ratio of the lateral movement of said pressing means may be varied with relation to the lateral movement of said work.

20. In a device'of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket-members projecting from said standards, a lateral shaft journaled in said bracket members, parallel lever members depending from said shaft, for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for controlling the movements of said parallel lever members, carrier-bars slidably mounted to project'from the faces of said standards, carrier plates suspended from said carrier-bars adapted to swing toward the backs of the opposed stretches of said abrading belts, a frame-work mounted on each carrier-plate, longitudinally and independently movable pressing fingers mounted in said framework and disposed at right angles to the plane of said abrading belts, resilient means engaging the rear ends of said pressing fingers, means engageable by said carrierplates for moving the same toward the backs of said abrading belts and holding the same yieldingly with relation to said abrading belts, and connecting links between said carrier-bars and said parallel lever members whereby said pressing-fingers are moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between and in contact with said. abrading belts.

21. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon. which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket-members projecting from said standards, a lateral shaft journaled in said bracket members parallel lever members depending from said shaft for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means. for controlling the movements of said parallel lever members, carrier bars slidably mounted to pro -ject from the faces of said standards, carrier plates suspended from said carrier-bars adapted to swing toward the backs of the opposed stretches of said abrading belts, a

frame-work mounted on each carrier-plate, v

longitudinally and independently movable pressing fingers mounted in said framework and disposed at right angles to the plane of said abrading belts, resilient means engaging the rear ends of said pressing fingers means engageable by said carrier-plates for moving the same toward the backs of said abrading belts and holding the same yieldingly with relation to said abrading belts, connecting links between said carrierbars and said parallel lever members whereby said pressing fingers are moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between and in contact with said abrading belts, and means for adjusting the connected relation of said connecting links with said parallel lever members whereby the ratio of the lateral movement of said pressing fingers may be varied with relation to the lateral movement of said work.

:22. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable, toward or away from each other, a carrier-table provided with work-holding means, bracketmembers projecting from said standards, a lateral shaft journaled in said bracket members, parallel lever members depending from said shaft for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for controlling the movements of said parallel lever members, carrier-bars slidably mounted to project from the faces of said standards, carrier plates suspended from said carrier-bars adaptedto swing toward the backs of the opposed stretches of said abrading belts, a frame-work mounted on each carrier-plate, longitudinally and independently movable pressing fingers mounted in said frame-work and disposed at right angles to the plane of said abrading belts, resilient means engaging the rear ends of said pressing fingers,

means engageable by said carrier-plates for moving the same toward the backs of said abrading belts and holding the same yieldingly with relation to said abrading belts, connecting links between said carrier-bars, and said parallel lever members whereby said pressing-fingers are moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between and in contact with said connected relation of said connecting abrading belts, and means for adjustin the links with said parallel lever-members whereby the ratio of the lateral movement of said pressing fingers may be varied with relation to the lateral movement of said work, comprising yoke-members connected with said parallel lever members, means for adjustably securing said yoke-members nearer to or farther away from the fulcrum of said parallel lever members, and means connected from each other, a carrier-table provided.

with work-holding means, bracket members projecting from said standards, a lateral shaft journaled in said bracket-members, parallel lever members depending from said shaft for suspending said carrier-table so that the same may be swung toward said abrading belts to feed the work to be ground between and laterally across the faces of said abrading belts, means for controlling the movements of said parallel lever members, carrier-bars slidably mounted to project from the faces of said standards, carrierplates suspended from said carrier-bars adapted to swing toward the backs of the opposed stretches of said abrading belts, a frame-work mounted on each carrier-plate, longitudinally and independently movable pressing fingers mounted in said frame-work and disposed at right angles to the plane of said abrading belts, resilient means engaging the rear-ends of said pressing fingers, a cam-plate at the outer end of each carrierplate, aspring retained lever arm against which said cam-plate moves to swing said carrier-plates toward the backs of said abrading belts and whereby the carrierplates are held yieldingly with relation to said abrading-belts, and connecting links between said carrier-bars and said parallel lever members whereby said pressing fingers are moved laterally across the backs of said abrading belts synchronously with the movea ment of said work laterally between and in contact with said abrading belts. 4

24. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for support ing and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket-members frame-work mounted on each carrier-plate, longitudinally and independently movable pressing fingers mounted in said frame-work and disposed at right angles to the plane of said abrading belts, resilient means engaging the rear-ends of said pressing fingers, a cam-plate at the outer end of each carrierplate, a spring retained lever arm against which said cam-plate moves to swing said carrier-plates toward the backs of said abrading belts and whereby the carrierplates are held yieldingly with relation to said abrading-belts, connecting links between said carrier-bars and said parallel lever members whereby said pressing fingers are moved laterally across the backs of said abrading belts synchronously with the movement of said work laterally between -and in contact with said abrading belts, and means for adjusting the connected relation of saidconnecting links with said parallel lever-members whereby the ratio of the lateral.movement of said pressing fingers may be varied with relation to the lateral movement of said work.

25. In a device of the class described, a pair of oppositely facing abrading belts, standards provided with means for supporting and driving said abrading belts, a base upon which said standards are movably supported so as to be adjustable toward or away from each other, a carrier-table provided with work-holding means, bracket members projecting from said standards; a lateral shaft journaled in said bracket members; parallel lever members depending from said shaft for suspending said carrier-table so that the same may e swun toward said abrading belts to feed the wor to be. ground between and laterally across the faces of said abrading belts, means for controlling the movements of saidparallel lever members, carrier-bars slidably mounted to project from the faces of said standards, carrierplates suspended from said carrier-bars adapted to swing toward the backs of the opposed stretches of said abrading belts, a.

frame-work mounted on each carrier-plate, I

longitudinally and independently movable pressing fingers mounted in said frame-work and dispose at right angles to the plane of said abrading belts, resilient means engaging the rear-ends of said pressing fingers, a cam-plate at the outer end of each carrierplate, a spring retained lever arm against which said cam-plate moves to swin said carrier-plates toward thebacks 0 said movement of said pressing fingers may be varied with relation to the lateral movement of said work, comprising yoke-members connected with said parallel lever members, means for adjustably securing said yokemembers nearer to or farther away from the fulcrum of said parallel lever members, and means connected with said yoke-members to which said connecting links are secured.

26. In a device of the class described, an abrading means, and meansfor pressing said abrading means to the work to be ground,

comprising a supporting frame-work, a plurality of longitudinally and independently movable pressing fingers the outer extremities of which are directed toward said abrading means, portion of reduced cross sectional area, fixed body ofresilient material with which said tail-portions contact.

In testimony, that I claim the invention set forth above I have hereunto set my han this 24th day of March, 1914.

JOHN G. BLEVNEY.

Witnesses: I

GEORGE D. RIoHAnos,

Fanox H. W. Fmrm'rzan.

each pressing-finger having a tail and a-