US980054A

US980054A - Abrasive machine.

Info

Publication number: US980054A
Application number: US49733309A
Authority: US
Inventors: John C Blevney; John Hausman
Original assignee: ATHA TOOL Co
Current assignee: ATHA TOOL Co
Priority date: 1909-05-20
Filing date: 1909-05-20
Publication date: 1910-12-27
Anticipated expiration: 1927-12-27

Description

J. c. BLEVNBY4 a; J. HAUSMAN. ABRASIVE MAGHINB. APPLICATION FILED MAY 20, 1909.

TH: NoRRls PETER: cc., wAsmNcTaN. o, c.

' J. o. BLBVNEY L J. HAUSMAN.

ABRASIVB MACHINE.

APPLIOATION FILED Muze, 1909.

Patented. Dec.' 27, 1910. I

6 SHEETS-SHEET 2.

ms Nans/s Plsrzns ca, wuNrNoYoN. n. c.

J. C. BLEVNEY & J. HAUSMAN.

ABRASIVE MACHINE.

APPLIOATION Hum MAY zo. 190s.

980,054. Patented Dec. 27, 1910.

5 EERSTE-SHEET 3.

-rNE NonRls Prsks ca., wAsNlNmaN. n. c.

J. C. BLEVNEY & J. HAUSMAN.

ABBASIVB MACHINE.

APPLIUATION FILED MAY zo. 190e.

nu Non!!! rlrrns ca. wAsumnmN. 1:: cy

J. G. BLEVNEY & J. HAUSMA'N.

ABEASIVB MACHINE.

APPLIGATIOH FILED MAY 20, 1908.

Patented Dec. 27, 1910.

5 SHEETS-SHEET 5.

(SRM.

E hm

@vih/luces l rlrlll cvJIAlNllwwll. n. c.

UNITED STATES PATENT OFFICE.

JOHN C. BLEVNEY'AND JOHN HAUSMAN, OF NEWARK, NEW JERSEY, ASSIGNORS T0 ATHA TOOL COMPANY, A CORPORATION OF NEW JERSEY.

ABRASIVE MACHINE.

Specification of Letters Patent.

Patented Dec. 27, 1910.

To all 'whom 'it may concern:

Be it known that we, JOHN C. BLnvNnr and JOHN HAUSMAN, citizens of the United States, and residents of Newark, county of EsseX, State of New Jersey, have invented certain new and useful Improvements in Abrasive Machines, of which the following is a specification.

Our invention relates to improvements in abrasive machines and especially to machines used for grinding, polishing or nishing small articles.

One of the objects of the invention is to provide a machine adapted to grind or polish such articles quickly, accurately and with a superior finish.

Another object is to produce a machine so that a large number of articles may be operated on at the same time.

Other objects will appear from the hereinafter description.

Vith this end in View, the invention comprises such details of construction and combination of parts as are hereinafter fully set forth in the following description and illustrated in the accompanying drawings, while the novelty thereof is pointed out in the claims.

For the purpose of illustration, and in order to give a clear understanding of the invention, we have set forth as one embodiment thereof a machine used in grinding or polishing hammers such as are generally used by machinists, but it is understood that this is by way of example only and that we make claim to such variations in the construction and combination of the machine as may properly come within the legitimate and intended scope thereof.

Referring to the drawings, Figure 1 is a front elevation of the machine embodying our invention. Fig. -2 is a detail plan view of belt adjusting means shown in Fig. 1; Fig. 3 is a plan view of the machine; Fig. l is a detailed view partly in section of a means for adjusting certain parts of the machine; Fig. 5 is a View of one end of the machine; Fig. 6 is a View of the opposite end thereof; Fig. 7 is a detailed view of mechanism for oscillating the work on the grinding or abrasing belt; Fig. 8 is a vertical section on line 8 of Fig. 7; Fig. 9 is a detailed sectional view showing the relation of a latch mechanism illustrated in Figs. 7 and 8; Fig. 10 is a detailed View of a bearing; Fig. 11 is a detailed view of a work-holder and its sup orting mechanism; Fig. 12 is a section on gine 12 of Fig. 11; Fig. 13 is a detailed view of a `jaw for holding or steadying the work on the abrasing belt; Figs. 111, 15 and 16 are detailed views illustrating the different positions of the work-holder grinding surfaces of different form from that shown in Fig. 11.

In the drawings, in which the same reference characters indicate the same part in the several views, the part marked 1 represents the framework of the machine for supporting the various parts; 2 is the driving shaft, to which power may be applied, as by a belt running over the pulley 3. The abrasive belt 11, by which the grinding or polishing is done, runs over a pulley 5 secured on the shaft 6 and over two

adjustable pulleys

7 and 8. From the shaft 2 power is transmitted to the shaft G by means of'a belt 9 running over the driving pulley 1() secured to the shaft 2 and over a pulley 11 secured to said shaft 6 and under an idler 12. The cushion or backing belt 13 is driven over said pulleys 5 and 7 and under the abrasive belt 4. In order to obtain the best results and to increase the life of the abrasive belt, it is advisable to provide means for adjusting said abrasive belt and the accompanying belt transversely 011 the pulleys, and also to provide means for keeping said belts under a constant and yielding tension. XVe have accomplished this by the means applied to the

pulleys

7 and 8. As the construction is the same in both cases, a description of one will suffice for both, and we will now describe said mechanism in connection with pulley 8. The pulley 8 is mounted to rotate on a stud 14, which projects from the face of a carrier or disk 15, having an arm 15a. This disk is provided with lugs 15b, to which it is pivotcd by a pin 16 to lugs 17n on a slide 17 movable in a guide 18. Between the arm 15a and the guide 1S is a hand-wheel 19. One end of the hub of this wheel bears against the free end of the arm 15, and the other end of this hub isV secured thereto `in the opening in said guideway 18. A

spring 2O is placed between the inner surface of the disk 15 and the guideway 18 asV shown, so as to press the arm 15a in contact with the hub of the liand-wlieel 19. By operating this hand-wheel in one direction, the disk 15 is turned on its pivot to adjust the pulley 8 laterally, as shown by dotted lines in Fig. 2. Then the hand-wheel is turned in the opposite direction, the said pulley is adjusted in said opposite direction by the pressure of the spring 20, which throws the disk 15 carrying the hub of the wheel in said opposite direction.

It may be advisable in soiiiecases to adjust the pulley horizontally instead of vertically as described, and we have provided the following means for accomplishing this. The rear face of the guideway 18 is provided with lugs 21:. 22 is a plate secured to the face of the machine which is provided with lugs 23. All of these lugs have openings therein, and a pin 24 passes through said lugs and pivots the guideway 18 to the plate 22. The guideway above and below the pivot line is provided with ears 25. Located between the guideway and the plate 22 are the two hand-wheels 26, which are secured to hubs 26a. Said hubs are provided with right and left handed screw-threads, and one end of each of these hubs screws into screwtlireaded openings in the ears 25 and the other end screws into screw-threaded openings iii the plate 22. By operating these hand-wheels 26 the slide carrier 18 can be adjusted on its pivot. In order to provide a constant and yielding pressure on the backing and guide belt, we connect to the slides 17 one end of rods 27 or 27a. The other end of each of the rods 27, 27a is screw threaded into one end of the sleeves 28, 28a. The other eiid of sleeves 28, 28a receives the screw-threaded end of the

rods

29, 29, the other end of which is pivoted to the free end of the levers 30 30a, secured to stud or shaft 31, 31a, running transversely of the machine. Secured on the shaft 31 is an arm 32, which supports an adjustable weight 33. The t-wo

rods

27 and 29 and the sleeve 28 constitute a turnbuckle by rotating the sleeve 28. The length of these rods may be shortened, and the slide 17 moves to the right or left accordingly, to give the proper tension or stretch to the abrasive or backing belt. rIhe lever and

weight

32 and 33 produces a yielding pressure, and 4the amount of this pressure depends upon the position of the weight on the lever.

To keep the abrasive belt at its work, and to prevent its sagging between the pulleys 5 and 7, we place a shelf or table 34 inside of the said backing belt. This table is secured to studs 35, which are adjustably connected by screw-threads to the transverse supports 3G.

7e will now describe the means for holding the work in engagement with the abrasive belt.

This mechanism is clearly illustrated iii Fig. 11 of the drawing, and we have taken as the article to be operated upon an ordinary niacliinists hammer A., so positioned in the holder that the spherical part thereof will be presented to the abrasive belt for grinding and polishing. To perform this work properly it is necessary to rotate the hammer on its axis and also to oscllate or rock it iii reference to the abrasive belt, so that all the parts of said spherical surface will be operated on by the belt to accurately and evenly grind or polish the saine. Y

37 is an arm consisting of two jaws or side-plates 37a, clamped to a shaft 52. Mounted between the free ends of these jaws, on pivots 38, is a bearing 39, through which extends a vertical shaft 40. To the upper end of the shaft is secured a wormgear 41, which is in engagement with worin 42 secured on a shaft 74. The bearing 40 is provided with a linger 41a, which engages or strikes against a stop 37 b, arranged between the two jaws 37a, forming the arm 37. Mounted in the bearing 39 is a spring pressed pin 43, which when the worm-gear 41 is in engagement with the worin 42 is pressed in its seat, but when the said wormgear is thrown out of engagement with the worin in the position shown by the dotted lines in Fig. 11 this spring pin is forced out of its seat by the spring and engages the front edge of one of the side-plates 37Z1 of the arm and holds the parts iii the position shown by said dotted lines. To restore t-lie parts to the first position, so that the wormgear 41 will contact with the worm 42, it is only necessary to press the pin in against the spring, when the parts will assume the position in full ines in said F ig. 11. Secured to the lower end of the shaft 40 is a work-holder 44, having a socket 45 therein, into which one eiid of the hammer is inserted and is provided with jaws 45h, which bear against the side of the hammer and hold the same and prevent it from rotating. Secured to the arm 37 1s a support 48, which is provided with a series of openings 46a,

to which is pivoted by a piii 48 a lever 47 The front arm 47a of this lever is overbal-I anced and bears against the upper end of the shaft 40, so as to produce pressure lengthwise of the shaft and hold the work to the abrasive belt. To increase this pressure and also to permit the pressure to be yielding, we connect to this arm 47 a spiral spring 48, one end of this spring beiiig connected to the arm 37, and the other end being connected to a plate 49, having a series of openings 51 therein by which it is connected to the arm by the pin 50. By adjusting' the pin in diiferent holes in this arm, the pressure of this spring will be varied. To hold and steady the work on the abrasive belt, we provide holding jaws 152, having to a clamp 53, fastened to a rod 56.

spring arms 152, which surround the part of the work being ground and hold it steady to the belt. Said holding jaws are securd T 1e shaft 52 is mounted in two upright triangular end frames 51 and 55, and are of such length as to permit a number of arms 37 for supporting the w0rk-holder to be secured thereto. In this machine there are two rods 56, each of which extends parallel to the shaft 52 and these rods are secured in the lower angles of the triangular shaped end frames 54 and By this construction the work-holders may be secured on thev shaft 52 in opposite directions. Fig. 11 shows the arm 37 extending in one direction from the shaft 52, and the dotted lines in Fig. 7 shows it extending in the opposite direction. The holding-jaws 152 are secured on each rod 56 in opposite directions and one for each work-holder, so that this construction permits the work to be inserted and attended to from both sides of the machine.

The end frames 54 and 55 are ournaled at their lower ends to the shaft 60 which is journaled in bearings 61 at each end of the machine outside of the frames. Each of these bearings is provided with a sleeve 62 through .which projects the eccentric portion 63a of shaft 63 supported in the bearings 64 at each end of the machine. Each of the eccentric shafts 63 has secured tothe end thereof a worm wheel 65. Each of these worm lwheels meshes with a worm 66. One of these worms is secured to a longitudinal shaft 67. .The other is secured to a sleeve 68 surrounding the said shaft near one end thereof. A hand wheel 69 is secured to this sleeve and a disk 7 0 is secured to the end of the shaft and is connected to the wheel by a bolt 71. This last described mechanism is for the purpose of raising and lowering the end frames and the parts supported thereby, and the shaft and sleeve connection 68 is for the purpose of adjusting the ends independently of each other, or together, as required. l/Vhen the hand wheel and disk are connected together the two eccentric shafts 63 are turned simultaneously and both of the frames are adjusted together. By disconnecting the disk and the hand wheel and turning each independently of the other, each eccentric shaft 63 can be moved and the end frames 541 and 55 adjusted accordingly. The raising and lowering of these end frames is for the purpose of moving the shaft 52 carrying the work holders so that the work may be properly located in relation to the abrasive belt, depending upon the nature of the work being operated on.

The mechanism for rotating the shaft 40 carrying the work holder 114 so that the work may be rotated on its axis will now be described. j Secured at theupper part of the end `frames 5&1 and y55 are the

bearings

72 and 73 and in these bearings are journaled the shafts 71 carrying the worms 412 which mesh with the worm-gear 411 secured to said shaft 410. 75 is a grooved pulley secured to the main driving shaft 2. Mounted on a shaftSf above this grooved pulley are two grooved pulleys 76 and 81. Secured to the frame 541 are two inclined

grooved pulleys

77 and 80 and fastened on each of the shafts 741 are the grooved pulleys 78 and 79. A belt 81a passes over these pulleys in the direction shown by the arrows. The inclined pulleys 77 and 80 are so positioned that the oscillation of the shafts 74 will not affect the driving of said shafts. To compensate for any slight difference in run of the belt 81 and to keep it taut, the shaft 82 on which the pulleys 76 and 81 are journaled is secured to a lever S3 pivoted at 841. Through the lower end of said lever projects a rod 85 one end of which is secured to the frame of the machine. Surrounding t-he other end of the rod is a spring 86 which bears against the lower end of said lever 83. This spring tends to throw the pulleys 76 and 81 in such position as to keep the belt taut and the spring itself permits the belt to yield. .Power is transmitted from the'main driving shaft 82 through the belt to the shafts 74, rotating the same, and through the worm and gear connection l11 and L12 the shaft 40 is rotated and the work held in the holder at the lower end of the shaft is rotated on its axis.

The mechanism for giving oscillatory motion to the spherical portion f1 of the hammer, the article being operated on, will now be described. In order to perform this function it is necessary to rock the two end frames 54 and 55 and all theV parts carried thereby and between them. Secured at the opposite end of the machine to that having the main driving mechanism is a toothed segment 90 which is formed in the construction shown as integral with the sleeve or bearing 61. This segment is stationary except that it is raised and lowered on the eccentric shaft when the end frames are raised andA lowered in the manner heretofore described. Bolted to the end frame is a two part bearing 91, said parts being held together by the bolts 92. This bearing supports a transverse driven shaft l93 carrying a'

worm

91,1. meshing with the teeth of the segment 90. The bearing 91 has trunnions 95 on each side thereof, one of which is journaled in an opening in the frame 55 and the bearing 7 3, and the other in the opening in the plate 96 which is secured to the end frame by the bolts 97. The shaft 93 has secured at each end thereof a wmrm-gear 98 which meshes alternately with the worms 99 on the end of each of the shafts 741, from which the said shaft 93 and the worm 911 thereon are driven in opposite directions,

`depending upon which pair of worm gears and worm are in mesh, causing the worm 94 to travel on the segment 90, either in one direction or the other.

As stated above, the bearing 91 is caused to rock on its trunnions with relation to the end frame and tothe iiXed bearings 73 bolted to said frame, but means are provided for locating the bearing 91 and the bearing 73 so that the two will oscillate together. To accomplish this the bearing 91 is provided with a depending member 100 and the bearing 73 is provided with asimilar depending` member 101. The member 100 is provided with a lug 102 to which is pivoted a catch 103 having a finger 103a passing through an opening 104 in the member 100 and adapted to engage on one side or the other of a lug 105 on the member 101. Under the opposite end of this catch is se cured a spring 106 which tends to throw the finger 103a in engagement with the lug 105. On the side of the segment 90- adjacent this catch is a cam stop 107. Secured to the segment 90 and to the bearing 91 on each side of the w'orm 94 are the coil springs 108. This mechanism operates as follows: Assuming that the parts are in the position shown by Figs. 6, 7 and 8 of the drawings, with the gear and

worm

98 and 99 to the left in mesh and held in this position by the catch 103, engaging the left face of the lug 105, the worm 99 rotating in the direction indicated by the arrow, the shaft 93 is rotated so that the worm-gear 94 travels to the right in the teeth of the segment 90. This movement carries the whole upper structure eX- cept the segment 90, to the right, saidstructure rocking on the shaft 60. During this movement the co-il spring 108 on the right i-s slackened, while the one to the vleft is put under tension. Said parts will continue to travel to the right until the upper end of the catch 103 comes in contact with the cam stop 107. W'hen said end of the catch engages this stop, that end is pressed down against the tension of the spring 106 and the end 103a is moved out of engagement with the lug 105, whereupon the coil spring 108 on the left will pull the left end of the shaft 93 down, throwing the left w'orm-gear 98 out of engagement withthe worm-gear 99, and throwing the right worm-gear 93 into engagement with the worm-gear 99 on the right. As soon as this occurs the said shaft I 93 and the worm 94'thereon, are moved in the reverse direction, the upper end of the catch 93 is moved out of engagement with the stop 107 and the end 103 of said catch snaps over the opposite side of the lug 105 and holds the gear 93 on the right in engagement with the worm 99 on the right. As the worm 94 travels to the left in the threads on the segment 90, the spring 108 on the left is slaclened and the one on J(he right is put under tension. When the parts travel to the left so that the catch 103 hits the stop 107 on the left, the parts are released and operate to move the parts to the right again, as hereinabove described. This mechanism alternately moves all the upper structure except the segment, as above stated, either to the right or to the left, oscillating all the upper structure and of course the articles being operated on (the hammer A) which are held by the work holder 44. The limit of oscillation may be varied or adjusted by changing the position of the stops 107 on the segment 90, which is provided with a series of holes 109 for this purpose. By this construction the whole upper structure is rocked on the shaft from one side to the other and at theV same time the work holding shaft 40 is constantly rotated and the spherical part of the hammer is given both rotary and oscillatory motion in contact with the abrasive belt. In order totake the strain of the upper structure off of the said

bearings

54 and 55 during the oscillat-ion of said upper structure, it is advisable to counterbalance this part of the machine. We have shown one means of doing this, which consists of a weight 110 connected to one end of a rope or cab-le 111, which passes over guide vpulleys 112. To the end of this cable is attached a hook 113 or other means which may be connected to the shaft 52.

The operation of the machine so far as described may be briefly recapitulated, as follows: Assuming that the spherical end of the piece of work as the hammer A is to be operated on, first the abrasive and the cushioning belts are adjusted on their pulleys by operation of the hand-wheels 26, and the tension on these belts is adjusted by the operation of the sleeve 28, forming one part of the turnbuckle andthe weight 33 carried by the lever 32. The work is then placed in the workholder and the whole upper frame is vertically adjusted so as to bring the work in proper relation to the abrasive belt by moving the hand-wheel and

plates

69 and 7 0. The amount of oscillation to be given to the upper works is also determined by properly positioning the stops 107 on the segment 90. The machine isV now started, whereupon the hammer will be rotated on its aXis, and at the same time it will turn or oscillate on the belt'by the mechanism hereinabove described. While the machine is running the hammer may be taken out and another hammer be inserted without stopping the machine. This can easily be done by swinging the shaft 40 into position shown in dotted lines in Fig. 11, so that the holder carrying the hammer will be thrown out of the way of the belt. If the machine is operating on work which requires slight oscillation of the upper part, the stops 107 are clamped close together on the segment 90. If no oscillation is required, the catch 103 is held out of engagement with have been provided.

the lug 105, so that neither one of the wormgears 98 will be in engagement with the worm 99. In this condition, the worm 94 is idle and the upper structure will remain stationary.

In Figs. 14 to 16 we have shown other parts of the work operated on than those in Fig. 11. In Fig. 14 we have illustrated the edge a of the striking face of the hammer being operated on; in this case the workholder may be given a slight oscillation if required, by placing the stops 107 close together and the hammer can be rotated on its axis as before stated. In Fig. 15 is illustrated the position when the cylindrical surface a2 of the hammer is being ground. In this case the workholder structure is moved down to one side until the workholder shaft is about in a horizontal position. The oscillating mechanism in this case is thrown out of gear, but the rotating means remain in gear and the hammer is rotated so that all of its cylindrical surface will be brought in contact with the abrasive belt. In Fig. 16 we have illustrated the position of the parts when the flat striking surface a3 of the hammer is to be ground. In this instance, the mechanism is operated until the workholder is vertical. If a flat surface is to be ground the oscillating mechanism is thrown out of gear, but if the flat surface has a slight curve the oscillating mechanism can be adjusted to give a slight movement, and then the shaft 40 is rotated as hereinbefore described. It is to be understood that the workholders are carried on opposite sides of the machine, hence when the upper structure is held in either of the positions indicated by the position of the workholders in Figs. 15 and 16 one set of holders on one side of the machine may be used for grinding the cylindrical surface a2, and the other set of holders in the opposite side may be set for grinding the flat surface cl3.

In order to obtain a fine finish of the work when the same is being ground, as is shown in Figs. 14, 15 and 16, and also to present different parts of the abrasive belt to the work, it is advisable to shift the article bcing ground transversely of t-he abrasive belt 4. To accomplish this, the following means shaft 60, and fastened thereto either by keys or otherwise, is a crank arm 118, having a crank pin 119. These crank arms are oscillated to produce a slight rocking motion to the shaft 60 and the upper structure by means of the connecting rods 1191. These connecting rods are pivoted to the upper right arms 120, fixed on the rock shaft 121, which is rocked by means of an arm 122 and connecting rods 123, which are pivoted on a main crank 124, fast in the slide 125, movable in a crank 126, secured to a shaft 127, which is driven from the main driving shaft On either end of thel by the worm-gear 128 and worm 129. The crank 126 and its slide 125 and pin 124- carried thereby constitutes an ordinary crank pin mechanism.

From the construction thus described, it is apparent that by adjusting the main crank pin 124 slightly ofi' thc center of the worm-gear shaft 127 a slight rocking motion is imparted to the crank pin 119, which in turn oscillates the rocking shaft 60 and the workholders, thus causing the work to be moved slightly on the opposite belt and transversely thereof It now remains to consider the cil'ect of the oscillation by the crank pin 119 when the spherical part of the hammer A is ground as shown in Fig. 1l. In this case the main crank pin is either placed on a dead center, as shown in Fig. 5, in which case the crank pin 119 with its connections move idly, or the crank arms 118 with the pin 119 may be disconnected from the shaft 60, so that no oscillatory motion will be given to the shaft. In such case the Work will not be moved transversely of the belt.

Frein the mechanism hereinabove described, it is seen that an article like a hammer may be finished and ground at various angles and under various conditions, and any number of different edges and surfaces may be exposed to the action of the same abrasive belt and at the same time. To grind other articles than a hammer in this machine, it is simply a matter or adjustment and suitable holding mechanism. Y

As many changes could be ma'de in the above construction and many apparently widely different. embodiments of our invention could be made without departing from the scope thereof, we 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. IVe desire it also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention, which, as a matter of language, might be said to fall therebetween.

Having `now described our invention, what We claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, an abrading means, a work-holding frame arranged adjacent thereto, work-holders carried thereby, means for oscillating the frame, means for raising or lowering the frame, and means for rotating the work-holders.

2. In a device of the class described, an abrading means, a work-holding frame arranged adjacent thereto, work-holders earried therebymans for oscillating the frame, means for tilting the frame, means for reciprocating the frame, and means for rotating the work-holders.

3. In a device of the class described, an abrading means, a work-holding frame arranged adjacent thereto, work-holders carried thereby, means for oscillating the frame, and means for raising and lowering one end of the frame independently of the other.

4. In a device of the class described, an abrading means, a work-holding frame arranged adjacent thereto, work-holders carried thereby, means for rotating the workholders, respective means for adjusting the height of the respective ends of the frame independently of the other, and means for connecting each of t-he latter means to adjust the height of both ends simultaneously.

5l In a device ofthe class described, the combination with an abrading means, of a work-holding frame, and adjusting mechanism therefor, comprising elements severally operable to raise or lower the respective ends of the frame independently, and jointly operable to raise or lower both ends simultaneously.

6. In a device of the class described, the combination with an abrading means, of a work-holding frame, a work-holder carried thereby, and adjusting mechanism for the work-holder connected wit-h the frame and comprising elements operable to raise the respective ends of the frame independently to tilt the work-holder in one or the other direction.

7. In a device of the class described, an abrasive belt, a work-holding frame arranged adjacent thereto, devices for raising or lowering the ends of the frame respectively independently of each other, and means for connecting the devices to move both ends simultaneously.

8. In a device of the class described, an abrading means, a work-holding frame arranged adjacent thereto, means for adjusting the height of either end of the frame independently of the other, means for oscillating the frame in any of t-he adjusted positions, and means for regulating the period of oscillation of the frame.

9. In a device of the class described, a driving-shaft. an abrading means driven thereby, work-holding means adapted to rotate the work in contact with the abrading means, and connected through intermediate mechanism to the driving shaft, and means whereby a portion of the intermediate mechanism may be disconnected from the remainder without affecting the movement of the remaining` portion.

. l0. In a machine of the class described, a driving shaft, an abrading means driven thereby, a movably-mounted bearing, means for supporting` said bearing, a shaft carried by the bearing, a work holder carried by the shaft, and gearing intermediate the workholder shaft and driving shaft, adapted to be disconnected by movement of the workholder shaft with its bearing.

l1. In a machine of the class described, a supporting means, means for carrying a work-holder shaft, mounted for pivotal adj ustment relatively to the supporting means, a spring-pressed device adapted to hold the shaft-carrying means in one position of its adjustment, said work-holder shaft, an abrading means, and gearing for rotating the shaft, adapted to be disconnected by pivotal movement of the shaft with its carrying` means.

l2. In a machine of the class described, a

driving shaft, an abrading means driven` thereby, a work-holder shaft, a pivotallymounted bearing therefor, an arm supporting the bearing, gearing for rotating the work-holder shaft, adapted vto be disconnected by pivotal adjustment of the shaft with its bearing in one direction, a spring-pressed pin carried by the bearing and adapted to engage the arm and hold the bearing in the latter position of its adjustment, and stop-means for defining the movement of the bearing and shaft in the other direction. y

13. In a machine of the class described, a driving shaft, abrading means driven thereby, a rotatably mounted shaft having workholding means at one end, gearing between said shaft and the driving shaft, means carrying said shaft and mounted for movement which disconnects the gearing and adjusts the work-holding elements away from the abrading means, and means for holding the shaft and its carrying` means in the latter position.

14E. In a machine of the class described, a driving shaft, an abrading means driven thereby, a. movably-mounted bearing, means for supporting said bearing, a shaft carried by the bearing, a work-holder carried by the shaft, spring-pressed means engaging' the latter shaft to hold the work against the abrading means, a gear wheel on the workholder shaft, and means actuated by the driving shaft and engaging the gear wheel for rotating the work-holder shaft in the bearing, the driving means between the shafts being adapted to be disconnected by movement of the work-holder shaft and its bearing.

15. In a machine of the class described, a frame, an abra ding means carried thereby, a work-holding frame pivoted to the first-mentioned frame, work-holders carried thereby, means for automatically oscillating the workholding frame, means for regulating the period of oscillation, means for moving the abrading` .means toward the work-holders, and means for rotating the article in contact with the abrading means. f

16. In a machine of the class described, an abrasive belt carried thereby, means for tensioning the belt, a Work-holding frame, pivoted to the first-mentioned frame, workholders carried thereby, means for automatically oscillating the work-holdii'ig frame, means for regulating the period of oscillation, and means for rotating the Work-holders in contact with the abrasive belt.

17. In a machine of the class described, a frame, and abrading means carried thereby, a Work-holding frame pivoted to the firstmentioned frame, Work-holders carried thereby, means for automatically oscillating the Work-holding frame, means for regulat ing the period of oscillation, means for reciprocating the Work-holding frame, and means for rotating the Work-holders.

18. In a machine of the class described, a frame, an ahrading means carried thereby, a Work-holding frame pivoted to the'firstmentioned frame, Work-holders 'carried thereby, mea-ns for automatically oscillating the Work-holding frame, means for counterbalancing the Weight of the Work-holders, and spring-pressed means for holding the Work in contact with the abrading means.

19. In a machine of the class described, a frame, an abrading means carried thereby, a Work-holding frame pivoted to the firstmentioned frame, means for oscillating the Work-holding frame, means for raising' or lowering either end of the Work-holding frame, means for reciprocating the Workholding frame, and means for counterbalancing the Weight of the Work-holding frame.

20. In a machine of the class described, the combination with a driving shaft and abrading means driven thereby, of a workholding` frame adapted to carry a plurality of Work-holders, a plurality of Work-holders carried thereby, means for oscillating the work-holdingI frame, means for reciprocating the Work-holding frame, and means for rotating the Worleholders, each of the Said means being actuated by the driving-shaft.

21. In a machine of the class described, a frame, a driving shaft mounted thereon, an a-brading means driven thereby, a Workholding frame pivoted to the first-mentioned frame adapted to carry a plurality of Workholders, a plurality of work-holders carried thereby, means for oscillating the Workholding frame, .means for reciprocating the Work-holding frame, and means for rotating the Worl -holders, each of the said means being actuated by the driving shaft.

22. In a deviceofA the class described, a frame, pulleys carried by said frame, an abrasive belt running over said pulleys, means for driving said pulleys, means for adjusting one or more of said pulleys laterally, mea-ns for moving said pulleys and tensioning said belt, a frame pivoted to and above the first mentioned frame, a Work holder connected to said second mentioned fra'me, means for rotating said vwork holder, and means for oscillating the frames whereby the Work holder is oscillated.

23. In a device of the class described, a frame, pulleys carried by said frame, means for driving said pulleys, an abrasive belt passing over said pulleys, frames pivotally connected to the lirst mentioned frame, a work holder secured to said second mentioned frame, means for rotating said work holder, Worm shafts carried by said frame, a stationary segment having teeth on the periphery thereof, a shaft secured to said frame having a worm-wheel on each end thereof and adapted to alternately mesh with the said worms, a worm carried by said shaft and meshing with the teeth on said segment, and means for alternately throwing the worm-wheel into and out of engagement with said Worms.

24. In a device of the class described, a frame, pulleys mounted on said frame, means for driving said pulleys, an abrasive belt carried by said pulleys, a shaft pivoted to said frame, a segment having teeth on the periphery thereof secured to said shaft, a frame journaled at each end of said shaft, a shaft extending from one of said end frames to the other, cross bearings connected to each of said end frames, worm shafts ymounted in said bearings, a pivoted bearing connected to one of said end frames, a shaft mounted in said pivoted bearings, a wormwheel at each end of said shaft and adapted to mesh with the worms on the worm shaft, a Worm on said second mentioned shaft engaging with the teeth on the segment, a spring on each side of the pivot of said Worm-Wheel, one end of cach spring connected to the segment and the other end of the spring connected to the shaft on opposite sides of the pivot of said shaft, means for holding one of the worm Wheels in engagement with the Worm during the travel of the Worm gear over the teeth of the segment in one direction, and for unlocking the same when the said Worm has traveled the limit of its movement in one direction.

25. In a device of the class described, a frame having eccentric shafts mounted thereon, a frame pivotally connected to each of said eccentrics, means for moving one of said eccentric shafts, means for moving the other eccentric shaft independently of the first, and means or connecting each of the latter means so that the said eccentric shafts can be moved simultaneously.

2G. In a device of the'class described, a frame, pulleys mounted on said framefa cushioning belt running over certain of said pulleys, an abrasive belt running over other of said pulleys, means for adjusting the pulleys laterally, means for moving said pulleys and permitting a yielding pressure on said belts, means for driving said pulleys, a

llO

and means for raising and lowering the shaft carrying said end frames.

In Witness whereof We have hereunto set our hands at the city7 county and State of l5 NenT York, this 6th day of May, 1909.

JOHN C. BLEVNEY. JOHN HAUSMAN.

In presence 0f- Jos, J. RANAGAN, ISABEL R. RIcHARDs.