US1181330A - Abrading or polishing machine. - Google Patents

Description

Y C. L. MATTISON.

ABRADING on POLISHING MACHINE.

APPLICATION FILED DEC.21, I914. 1,11 33Q Patented May 2, 19160 4 SHEETS-SHEET 3.

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APPLICATION FILED DEC-21.1914.

l 1 8 1 ,330, Patented May 2, 1916.

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THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

C. L. MATTISON.

ABRADING 0R POLISHING MACHINE. APPLICATION FILED DEC-21,1914.

1 1 8 1 ,330. Patented May 2, 1916.

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CARL LAWRENCE MATTISON, 0F BELOIT, WISCONSIN, ASSIGNOR T0 C. MATTISON MACHINE WORKS, OF BELOIT, WISCONSIN, A CORPORATION OF WISCONSIN.

ABRADING OR POLISHING MACHINE.

Specification of Letters Patent.

Patented May 2, 1916.

To all whom it may concern Be it known that I, CARL LAWRENCE MAT- TISON, a citizen of the United States, residing at Beloit, in the county of Rock and State of WVisconsin, have invented certain new and useful Improvements in Abrading or Polishing Machines, of which the following is a specification.

This invention contemplates certain improvements in the abrading or polishing machine disclosed in a prior application Serial No. 604,808, filed January 26, 1911 by De Laski T. Clemons, upon which application Patent No. 1,145,184 issued on July 6, 1915.

One of the objects of the present invention is to improve the construction of the means for shifting the point of contact of the belt along the work, with a view to simplifying said means and rendering it more compact.

Another object of the invention is to provide improved means for actuating the said shifting means byhand and for controlling the power driving means.

The invention further aims at certain improvements in the power-driving means for actuating the shifting means.

In the accompanying drawings, Figure 1 is a fragmental front elevation of an abrading or polishing machine embodying the features of my invention. Fig. 9 is a top plan view of the parts shown in Fig. 1. Figs. 3 and 4 are transverse sectional views taken in different vertical planes from front to rear of the machine. Fig. 5 is a vertical section taken at right angles to Fig. 4. and looking rearwardly in the direction of the arrows 5-5 on the latter figure. Figs. 6 and 7 are horizontal detail sectional views taken substantially in the planes of lines '6 and 7, respectively, of Fig. 4. Fig. 8 is a transverse vertical section illustrating certain details of the belt-pressing means. Fig. 9 is a view looking rearward from a plane indicated by lines 9-9 in Fig. 3 and illustrating in front elevation a portion of the power means for driving the shifting means and for changing the stroke of the latter.

I have shown in the drawings the preferred embodiment of my invention and this embodiment will now be described in detail, without any intention, however, of limiting the ie ee iw it lf n th xempla y f m disclosed, except as recited in the appended claims.

1 have shown only so much of the machine as is necessary to an understanding of my invention. For a full understanding of the complete machine reference may be had to the patent above referred to, the same reference characters being used in both cases as far as possible. The frame of the machine includes a beam 22 supported at its ends upon suitable standards and carrying pulleys over which runs the abrading belt 34 shown in Figs. 1 and 3.

The reference character a indicates a piece of work which is supported on a suitable table beneath the belt.

The means for pressing the abrading or polishing belt 84 against the work and for shifting the point of contact of the belt along the work includes a presser frame which comprises a downwardl opening channel bar 56 having a series of pairs of oppositely disposed lugs or ears 58 depending from its lower edges. Beneath this bar 56 is a presser plate 59 which preferably consists of a flexible strip of sheet metal, said presser plate being carried by a series of pins 60 having angular lower ends 61 which loosely engage in upstandinglugs 63 fixed to said plate, said pins extending upwardly through U-shaped brackets 62 depending from the channel bar 56, the portions of the pins above the brackets being surrounded by coiled compression springs 64 which tend to draw the presser plate upwardly. A layer of felt or like material 57 is preferably secured to the lower face of the presser plate 59, the abrading belt 34 running in Contact with this felt.

A plurality of gear segments 73 are positioned between the pairs of depending cars 58 and are fixed on pivots or shafts 66 which are journaled in the said ears. Below its shaft 66 each pinion is provided with a pair of depending lugs 67 and between these lugs is pivoted a rocker member 69 which has a pair of rollers 70 journaled in opposite ends thereof, the rollers being adapted to bear against the presser plate 59. The pivotal mounting of the rocker member 69 P rmits h ro le 70 to a j them lv s to any inequalities or uneven surfaces in the work. The lugs 67 on the gear segments, the rocker members 69 and the rollers 70 constitute belt-pressing arms which swing about the shaft 66 as an axis.

A rack-bar 74 is slidably guided in suitable bearings between the sides of the presser frame or channel bar 56 and meshes with all of the gear segments 73, whereby the latter will be rocked when the rack-bar is reciprocated. The gear segments are associated with the rack-bar in gradually increasing arcuate positions so that the arms, which include the lugs 67, members 69 and rollers 70, project from their shafts 66 at gradually increasing angles with reference to a vertical plane, as shown in Fig. 1. It will therefore be seen that when the rackbar 7A is reciprocated the said arms will be successively carried into vertical position, each arm when in such position pressing the presser plate 59 and therefore the belt 34 downwardly at that point into contact with the work. As the rack-bar is reciprocated this contact point is caused to travel back and forth upon the work longitudinally of the belt.

The presser bar 56 is supported by a plurality of links 76 pivotally carried by the outer ends of horizontal arms 77, the rear ends of said arms being fixed to a rock-shaft 78 mounted in bearing brackets 79 secured to the cross-beam 22. Certain of the links 76 are pivotally connected to the outer ends of additional arms 80, indicated in dotted lines in Fig. 3, the rear ends of said arms 80 being pivotally mounted in certain of the bearing brackets 79. The arms 77 and SO constitute a parallel motion device by means of which the belt-pressing means is maintained in a vertical position in the swinging movement of the supporting arms. A suitable counterweight (not shown herein) is provided to counterbalance the weight of the pressing means.

The pressing means is moved downwardly to its work by a hand-lever 83, which, in the present instance, is in the form of a square rod having a handle 84 fixed on its forward end, the rod being mounted in a gimbal bearing which permits of swinging movement brth in a vertical and a horizontal direction. This bearing (Fig. 5) comprises a lower yoke-shape member 86 mounted to turn in a horizontal plane and an inner rectangular member 87 mounted on trunnions in the other member to rock in a vertical plane. A sleeve 88 extends through the member 87 and is rotatable therein, and the hand-lever 83 passes through this sleeve. Collars 89 are fixed on the opposite ends of the sleeve and are provided with square openings in which the square lever is slidably mounte 1. A roller 90 is rotatably mounted on the forward portion of the sleeve 88 and is adapted to travel in a slot 91" in a semi-circular guide 91, the ends of which guide are fixed to two adjacent presser-frame'supporting links 76. Adjustable stops 92 mounted on the guide 91 may be set at any desired places to limit the pivotal movement of the lever 83 in a horizontal plane. it will be seen that by depressing the forward end of the lever 83 the presser frame 56 will be lowered to carry the belt against the work.

The work-supporting table (not herein shown) may be mounted to travel forwardly and back upon suitable tracks so as to carry the work under the belt 34:. In thus pushing the table forwardly and back it is convenient for the operator to follow the table. To permit the operator to do this and at the same time to retain complete control of the machine, the operating lever 83 is made of sufficient length so that the handle 81 may be held in the operators hand even when the table 26 is at the forward limit of its movement, the lever 83 being slidable longitudinally in its support.

The lower member 86 of the gimbal bearing is rigidly fixed, as by a key 10, upon the upper end of a hollow shaft or sleeve 11 (see Figs. 4: and 5) which is rotatably mounted in a bearing 12 in the beam 22. A hub or collar 13 rotatably surrounds the sleeve 11 at the lower end of the bearing 12 and is held in place on the sleeve by means of a nut 14 threaded on the sleeve and seated in a recess in the lower face of the said collar. An arm 15 is pivoted at 16 between two lugs on the collar 13, the other end of said arm having a slot 17 which receives a roller stud 18 seated in a bracket 19, said bracket being rigidly fixed to the rack-bar 7 1 and sliding in a slot in the presser bar 56. (See Figs. 6 and 7). The collar 13 constitutes the hub of the arm 15 and provides a universal mounting for the arm so that the free end of the latter may move horizontally with the rack bar 74 and also up and down with the presser frame. 7

A shaft 20, which, in the present instance, is in two sections, is slidably mounted in the sleeve 11 and in the lower end of this shaft is fixed a cross-pin 21 which passes through slots 22 in the sleeve 11 and into a vertically slidable clutch collar 23 which surrounds the lower part of the sleeve 11. Suitable keys 2A connect said clutch-collar slidably but non-rotatably to the sleeve. This collar has one or more projections 25 (Fig. 7) on its upper edge to engage in a recess or recesses 27 in the collar 13, whereby to clutch the latter collar to the sleeve 11 to rotate therewith. When the two collars 13 and 23 are clutched together, horizontal oscillation of the hand-lever 83 will reciprocate the rackbar 74; through the connecting medium of the sleeve 11, collars 13 and 23, and arm '15. It will be seen that the distance from the handle 84 of the operating lever to its pivotal support, that is the axis of the sleeve 11, is much greater than the distance from such axis to the end of the arm 15, so that a powerful leverage is obtained, whereby to manually reciprocate the rack-bar.

A lever 28 is pivoted in a stationary bracket 29 on the beam 22, the shorter end of said lever underlying the clutch collar 23, while the longer end of the lever underlies a latch 116 which forms a part of the poweractuating means to be presently described, said latch having a notch 117 (Fig. 9) adapted to receive a roller stud 118 seated in the bracket 19 on the rack-bar. When the clutchcollar 23 is in its lower position, as shown in Fig. l, the lever 28 acts to hold the latch 116 in engagement with theroller stud 118 so that the power-driving means will be connected to the rack-bar 74. WVhen the collar 23 is raised the weight of the latch 116 and the longer end of the lever 28 is suflicient to swing said lever and permit the latch to drop out of engagement with the stud 118. In this latter position of the parts, the power-driving means is disconnected, and the arm 15 is connected to the {:and-lever for manually operating the rack At the upper end of the bearing 12 in the cross-beam 22 is an arm 127 having a hub which rotatably surrounds the sleeve 11. On its free end this arm carries a segment 126, which, when the arm is oscillated, is arranged to adjust the power-driving means, whereby to change the length of reciprocatory stroke of the rack-bar.

Above the hub of the arm 127 is a retaining collar 30 which is rigidly fixed on the sleeve 11, as by being shrunk thereon, the retaining collar being seated in a recess in the upper face of thehub.

A clutch collar 31 surrounds the sleeve 11 above the hub and collar just mentioned, being slidably but non-rotatably connected to the sleeve by a suitable key 10 which may be the same key that fixes the gimbal bearing onto the sleeve. The lower face of the clutch collar 31 is recessed to receive the retaining collar 30 and the clutch collar has one or more depending projections 32 at its loweredge adapted to enter a recess or recesses in the hub of the arm 127 so as to lock the said arm to the sleeve 11 when the clutch is lowered. A cross-pin 33 is fixed in the clutch collar and passes through slots 35 in the sleeve 11 and also through slots 36 in the hollowed upper end of the shaft 20. A coiled compression spring 37 is located within this hollowed upper end of the shaft 20 and bears at its lower end against'the cross-pin 33 and at its upper end against a suitable plug 38 threaded into the shaft. This spring tends to press the clutch collar 31 downwardly to the limit of movement permitted by the slot 36 in the shaft and the spring permits the collar to yield upwardly when the shaft is pushed down in clutching the collar to the hub of the arm 127.

A coiled compression spring 39 surrounding a reduced middle portion of the shaft 20 bears at its upper end against a shoulder 10 on the said shaft and at its lower end against a washer 41 which is slidable with relation to the shaft and is supported by a stop pin 12 fixed in the sleeve 11. The spring 39 thus tends to move the shaft 20 upwardly. The shaft is arranged to be pushed downwardly by means of a cam member 43 which is fixed upon the sleeve 88 through which the operating lever 83 passes. By rotating or twisting the said operating lever on its axis the position of the shaft and therefore of the clutch collars 23 and 31 may be controlled.

Power for reciprocating the rack-bar 74 is transmitted through a longitudinally extending shaft 91 (Fig. 2) which is rotatably mounted in bearings 95 on the beam 22, said shaft being suitably connected to the main drive-shaft of the machine. A pinion 97 is slidably but non-rotatably mounted upon the shaft 95 and is arranged to mesh with a crown gear 98 having a plurality of concentric rings of gear teeth on its rear face. The pinion 97 is arranged to be slid along the shaft 94: into mesh with different rings of gear teeth by suitable means herein shown as comprising a slide-bar 102 mounted in the bearings 95 beneath the shaft 94; and connected to the pinion 97, said slide-bar being operable by a hand-lever 103 pivoted at 104 on the cross-beam 22, the forward end of said lever extending into position to be grasped by the operator at the front of the machine.

The crown gear 98 is fixed upon the rear end of a horizontal shaft 99 (Fig. 3). Surrounding this shaft forwardly of the said crown gear and rotatably mounted in bear ings in the beam 22 is a sleeve 105 having at its forward end a circular flange 106, said flange having an annular flange 107 at its periphery. Fixed upon the forward end of the shaft 99 is a crank disk 108 (Fig. 9) and rotatably carried by said disk is a gear wheel 109 meshing with an internal gear wheel 110 secured to the forward edge of the flange 107. A crank pin 111 is carried by a disk 111 secured in any suitable way to the gear wheel 109 so that in certain positions of the parts the axis of said crank pin will coincide with the axis of the shaft 99. A frame 112 which is horizontally slidable upon a guide bar 113 fixed to the crossbeam 22 has a vertical slot 114 (Fig. 1) therein into which the crank pin 111 extends, so that movement of said crank pin in a horizontal direction will slide the frame 112. The crank pin 111 may have a block 115 rotatably mounted thereon and slidable within the slot 114. The reciprocatory movement of the frame 112 is arranged to be transmitted to the rack-bar 74: by means of the latch 116 previously described, said latch being pivoted at one end to the frame 112.

Upon the rear end of the sleeve is lixed a worm wheel 121 meshing with a; worm 122 fixed upon a shaft 123 (Fig. 1) which is rotatably mounted in a bearing upon the cross-beam 22. On the upper end of the shaft 123 is a pinion 125 which meshes with the segment 126 on the arm 127 previously described. When the shaft 99 is rotated, the gear wheel 109 travels with the disk 103 around the inner periphery of the stationary internal gear 110. The internal periphery of the gear is double that of the periphery of the gear 109 so that in each rotation of the shaft 99 the gear wheel 109 makes two complete rotations. When the relative positions of the gears 109 and 110 are as indicated in Fig. 9, rotation of the shaft 99, and therefore the disk 10S and gear 109 will not move the crank pin 111 in a horizontal direction, but will merely carry said pin upwardly and downwardly in the slot 11 1. The frame 112 and rackbar 7-1: will, therefore, be at a standstill. By rotating the internal gear 110 a quarter of a revolution through the medium of the hand-lever 83 and segment arm 127, the gear 109 will be moved through a half-revolution, or into position where the crank pin 111 lies at the opposite side of said gear 109 from that shown in Fig. 9. In this position of the parts when the shaft 99 is rotated the crank pin 111 does not move vertically, but travels through its maximum horizontal distance, and the rack M is given its full reciprocatory movement. It will be understood that the internal gear. 110 may be adjusted to any position intermediate the two extremes mentioned, so that the rack 7% may be given any desired length of stroke. The proportions of the connections are such that the extreme pivotal movement of the operating handle 83 in a horizontal plane will be effective in rotating the internal gear 110 through a quarter revolution, or suiiicient to regulate the horizontal movement of the crank pin 111 from its maximum to nothing.

In operation, when the operator desires to carry the belt into engagement with the work, he depresses the forward end of the hand-lever 83 to lower the presser frame. If the shifting means is to be driven by power, the cam 43 on the hand-lever is placed in its downwardly projecting position (shown in Fig. 4 and in dotted lines in Fig. 5). This will connect the latch 116 to the rack-bar so that the latter will be reciproeated. Should it be desired to change the length of traveling movement of the rackbar and therefore the space of contact of the belt with the work, the operating handle 83 is swung in a horizontal plane to oscillate the segment arm 127 and thereby shift the rack-bar 74 the hand-lever is twisted or rotated on its axis to change the position of the cam 13 and permit the clutch collars 23 and 31 to be raised by the spring 39, thereby clutching the arm 15 to the sleeve 11. The hand-lever is now swung in a horizontal plane to reciprocate the rack-bar. The point of contact of the belt may be changed to any spot on the work desired and held there as long as the operator wishes.

I claim as my invention:

1. In a machine of the character described, a presserframe comprising two sides, a rack-bar mounted between said sides for longitudinal reciprocation, and a plurality of belt-pressing devices rotatably mounted between the sides of the frame and each comprising a gear element meshing with said rackbar, said beltpressing devices being spaced at progressive angles with respect to each other.

2. In a machine of the character described, a downwardly opening channel bar, an opcrating-bar mounted between the sides of said channel bar for longitudinal reciprocation, and a series of independent belt-pressing devices spaced along said channel bar and rotatably mounted between the sides thereof, each of said devices being connected with said operating bar.

3. In a machine of the character described, a presser-frame comprising a downwardly opening channel bar having a series of pairs of oppositely disposed depending cars at its lower edges, a series of belt-pressing devices, each of which is mounted between the ears of one of said pairs, and operating means connecting all of said devices together.

1. In amachine of the character described, a downwardly opening channel bar having a series of pairs of oppositely disposed de pending cars at its lower edges, a series of belt-pressing devices, each positioned between the ears of one of said pairs and rotatably mounted therein, and an operating member extending longitudinally between the sides of said channel bar and operatively connected to all of said devices.

5. In a machine of the character described, a presser-frame comprising two sides, an operating bar mounted between said sides for longitudinal reciprocation, the said sides lying close to said bar, and a plurality of rotatable belt-pressing devices mounted between said sides and beneath said bar and operatively connected to the bar.

6. In a machine of the character described, a resser-frame comprising two sides, an operating bar positioned between said sides and mounted for longitudinal reciprocation, the sides lying close to said bar, a plurality of members positioned between said sides and rotatably mounted therein on independent transverse axes, said members being operatively connected to said bar. a rocker member mounted in the lower ends of each of the first mentioned members for rocking movement transversely of said bar, and rollers carried by said rocker members.

7. In a machine of the character de scribed, a downwardly opening channel bar having a series of opposed depending ears at its lower edges, a rack-bar mounted between the sides of said channel bar for longitudinal reciprocation, a series of gear elements each positioned between two of the opposed ears and rotatably mounted in the ears on independent transverse axes, sald gear elements meshing with said rack-bar, and rocker members carrying rollers and mounted in said gear elements beneath their axes.

8. In a machine of the character de scribed, a presser-frame, an operating bar mounted therein for longitudinal reciprocation, and a plurality of belt-pressing devices mounted in the presser-frame in a vertical plane directly beneath said operating bar, said pressing devices being operatively connected to said bar and being independently movable with relation with said bar.

9. In a machine of the character described, a Presser-frame, a rack-bar mounted therein for longitudinal reciprocation, a series of gear elements rotatably mounted in the presser-frame and disposed directly beneath the rack-bar and meshing therewith, and belt-pressing devices each mounted on one 'of said gear elements and disposed directly beneath the same.

10. In a machine of the character described, the combination of a main framework, a presser-frame mounted thereon for movement up and down, shifting means mounted in said presser-frame, a hand-lever, a member mounted in the main framework for rotation on a vertical axis and arranged to be rotated by said hand-lever, and an arm mounted to swing about said member as an axis and arranged to be oscillated thereby, said arm having one end directly attached to said shifting means.

11. In a machine of the character described, the combination of a main framework, a presser-frame mounted thereon for movement up and down, shifting means mounted in the presser-frame, a hand-lever, a vertically disposed rotary member mounted in the main framework behind said presserframe and arranged to be rotated by said handdever, and an arm mounted to rotate on the axis of said member and adapted to be oscillated thereby, said arm projecting forwardly from said member and having its free end directly attached to said shifting means.

12. Ina machine of the character described, the combination of a main framework, shifting means mounted thereon for movement up and down and comprising a longitudinally reciprocatory operating member, a vertically disposed rotary shaft mounted in the main framework behind said shifting means, a horizontally disposed oscillatory hand-lever mounted in a bearing at the upper end of said sleeve and arranged to rotate the latter, and an arm mounted on the lower end of said sleeve and adapted to be oscillated thereby, the arm projecting forwardly from the sleeve and having its for- Iward end attached to said operating mem- 13. In a machine of the character described, the combination of a main framework, shifting means mounted thereon for movement up and down and comprising a longitudinally reciprocatory operating memher, a vertically disposed rotary shaft mounted in the main framework behind said shifting means, a horizontally disposed operating lever arranged to depress said shifting means, and being also adapted to rotate said shaft, an arm connected to the said 'operating member and rotatably mounted on said shaft, and means operable by said handlever for clutching said arm to said shaft.

14. In a machine of the character described, the combination of shifting means, a rotary shaft, a hand-lever adapted to rotate said shaft, an arm rotatably mounted on said shaft and arranged to operate the shifting means, a clutch collar slidable on said shaft and arranged to rigidly connect saidarm to said shaft, and means operable by said hand-lever for sliding said clutch collar.

15. In a machine of the character described, the combination of a main framework, shifting means mounted thereon for movement up and down, a vertically disposed rotary shaft having a bearing on its upper end. a hand-lever mounted in said bearing and arranged to depress said shifting means and to rotate said shaft, an arm rotatably mounted on said shaft and connected directly to said shifting means, and means operable by said hand-lever. for rigidly securing said arm to said shaft.

16. In a machine of the character described, the combination of shifting means, a rotary shaft, a hand-lever arranged to rotate said shaft, an arm connecting said shaft to said shiftmg means, and means operable by said hand-lever for connecting said arm to the shaft and disconnecting the arm therefrom.

17. In a machine of the character described, the combination of shifting means,

power-driving means therefor, a hand-lever, a shaft adapted to be rotated by said handlever, an arm adapted to be oscillated by said shaft, said arm being directly attached at one end to said shifting means, and means for alternately connecting the arm to the shaft and for connecting the power-driving means to the shifting means.

18. In a machine of the character described, the combination of a main framework, shifting means mounted thereon, a vertical shaft mounted in the framework behind said shifting means, a horizontal hand-lever mounted on the upper end of said shaft for rotating the latter, an arm mounted on the lower end of said shaft and connected to said shifting means, power means for driving said shifting means, a connection between said power means and said shifting means, and means operable by said hand-lever for operating said connection and for simultaneously clutching or unclutching said arm to or from said shaft.

19. In a machine of the character described, the combination of a main framework, shifting means mounted thereon for movement up and down and comprising a longitudinal reciprocatory operating member, a sleeve mounted in the main framework behind said shifting means and having a gimbal bearing fixed on its upper end, a horizontal hand-lever mounted in said bearing and arranged to depress said shifting means, an arm mounted on the lower end of said sleeve and having its forward end connected to said operating member, power-driving means, a connection between said driving means and said shifting means, and means within said sleeve and operable by said hand-lever for clutching and unclutching said arm to and from said sleeve, the latter means being arranged to simultaneously operate the said connection between the driving means and shifting means.

20. In a machine of the character described, the combination of shifting means comprising a reciprocatory member, an oscillatory arm attached to said member, a shaft for oscillating said arm, a hand-lever for rotating said shaft, power-driving means including a latch adapted to be connected to said operating member, and mechanism operable by said hand-lever for clutching said arm to said shaft and for simultaneously operating said latch.

21. In a machine of the character described, the combination of shifting means comprising a reciprocatory operating member, an oscillatory arm attached to said member, a rotary shaft for operating said arm, a hand-lever for rotating said shaft, a clutch collar slidable on said shaft and adapted to engage said arm, power-driving means including. a latch adapted to be connected to said operating member, said latch being operable by said clutch collar, and means controlled by said hand-lever for sliding said clutch collar to operate said latch and simultaneously clutch or unclutch said arm to or from said shaft.

22. In a machine of the character described, the combination of shifting means comprising a reciprocatory operating member, power means for reciprocating said member, a hand-lever, means operable by said hand-lever for manually reciprocating said operating member, means for adjusting said power means to change the stroke of said operating member, and clutch means operable by said hand-lever arranged to alternately connect said stroke-changing means and said manual operating'means to the hand-lever.

23. In a machine of the character described, the combination of a main framework, shifting means mounted at theforward side of said framework, a drive-shaft at the rear side of the framework, a shaft running from front to rear of the framework, a crown gear fixed on the rear end of the latter shaft and having a plurality of concentric gear rings, a pinion slidable on the first mentioned shaft and adapted to mesh with any one of said rings, and mechanism connecting the forward end of the frontto-rear shaft to the shifting means for operating the latter.

24. In a machine of the character described, the combination of a main framework, shifting means mounted at the forward side of said framework, a drive-shaft at the rear side thereof, a shaft extending from front to rear between said shifting means and said drive-shaft, means connecting the forward end of the latter shaft to the shifting means for operating the latter, a crown gear fixed on the rear end of the front-to-rear shaft and having a plurality of concentric gear rings, a pinion slidable on the first mentioned shaft and arranged to mesh with any of said gear rings, a slide for moving said pinion, and a hand-lever at tached to said slide and extending forwardly to be grasped by the operator at the forward side of the machine.

25. In a machine of the character described, in combination, a bearing, a sleeve rotatably mounted therein, an arm loosely mounted on the sleeve below said bearing, another arm loosely mounted on the sleeve above the bearing, two clutch collars slidably but non-rotatably mounted on the sleeve above and below said arms and arranged to alternately connect the respective arms to the sleeve, a shaft mounted within the sleeve and pinned to said clutch collars, and means for sliding said shaft to operate said collars.

26. In a machine of the character described, a rotary sleeve, a shaft within the sleeve, two clutch collars slidably keyed on the sleeve and pinned to said shaft, two arms loosely mounted on the sleeve and adapted to be engaged by the respective clutch collars, and means for sliding said shaft to operate the clutch collars.

27. In a machine of the character described, the combination of a rotary sleeve, a gimbal bearing fixed on one end of the sleeve, a hand-lever mounted in said bearing, a cam fixed with relation to said handlever, a shaft slidable within said sleeve and adapted to be moved by said cam, two clutch collars surrounding said sleeve and slidably keyed thereto, said collars being pinned to said shaft to slide therewith, and two arms loosely surrounding said sleeve and adapted to be clutched by the respective clutch collars.

28. In a machine of the character described, the combination of shifting means mounted for movement bodily up and down and comprising a longitudinally reciprocable operating member, a vertical shaft, a hand-lever arranged to rotate said shaft, and an arm having a universal mounting on said shaft and attached to said operating member, whereby the latter may be reciprocated by said hand-lever.

29. In a machine of the character described, the combination of a stationary vertical shaft, shifting means mounted for movement bodily up and down with relation to said shaft, an arm having a universal mounting on said shaft and operable thereby, said arm being connected to said shifting means, and means for rotating said shaft.

30. In a machine of the character described, the combination of a stationary vertical shaft, shifting means mounted for movement bodily up and down with relation to said shaft, said shifting means comprising a horizontally reciprocable operating member, an arm having a universal mounting on said shaft and connected to said member, and manually operable means for oscillating said shaft to actuate the shifting means.

31. A machine of the character described having, in combination, an abrading or polishing belt, means mounted for movement up and down and arranged to press said belt against the work and including a horizontally reciprocatory part, a horizontally disposed handle mounted to swing .on a vertical aXis located behind said belt, and an oscillated by said hand lever through said member, and abrading or polishing means including a reciprocatory part which is directly connected to and driven by said arm.

33. A machine of the character described having, in combination, an abrading or pol ishing belt, means for pressing the belt against the work and for shifting the point of contact of the belt along the work, a

vertical rotary shaft located behind said belt, a horizontally-disposed hand lever for rotating said shaft, an arm arranged to be oscillated by said shaft, said arm projecting forwardly and being directly connected at its forward end to the shifting means for actuating the latter.

34:. A machine of the character described having, in combination, shifting means, power-driven means for actuating said shifting means, means for changing the stroke of said shifting means, and means independent of the aforesaid means for manually operating said shifting means.

35. A machine of the character described having, in combination, an abrading or polishing belt, shifting means including a plurality of belt-pressing devices and a longitudinally reciprocable operating member therefor, power-driving means for actuating said shifting means, and means mount ed independent and separate from the power-driven means for manually actuating said shifting means.

36. A machine of the character described having, in combination, shifting means, power driving means therefor, a disengageable connection between said two means, a hand lever, and means mounted independent and apart from said power driving means and arranged to provide a direct disengageable operating connection between said hand lever and said shifting means, whereby the latter may be driven by power or by hand as desired.

In testimony whereof, I hereunto set my hand in the presence of two witnesses.

CARL LAWRENCE MATTISON.

In the presence of J. W. DOWNING, E. M. IRISH.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents, Washington, D. G.

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