US1308933A - Grinding ob polishing machine - Google Patents

Description

E.CAV1CCHI.

GRINDING 0R POLISHING MACHINE.

APPUCATION FILED AUG-2 1915 1,308,933. Patented July 8, 1919.

2 SHEETS-SHEET I.

\nvenlor Ercole Cuvicchi Attys THE COLUMBIA FLANOCIRAPH co., WASHINGTON. n. c.

E. CAVKCCHI.

GRINDING 0R POLISHING MACHINE. APPLICATION HLED AuG.2. 1916.

'1 ,308,933. Patented July 8, 1919.

2 SHkETS-SHEET 2.

\nvenl'o'r. 75 Evade CuvicchX Attys.

m2 COLUMBIA Punmumpu co, wnsuwnrow, n. c.

ERCOLE CAVICCHI, 0F QUINCY, MASSACHUSETTS.

GRINDING OR POLISHING MACHINE.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed August 2, 1916. Serial No. 112,649.

To all whom it may concern:

Be it known that I, EncoLn GAvIccHI, a citizen of the United. States, and resident of Quincy, county of Norfolk, State of Massachllsetts, have invented an Improvement in Grinding or Polishing Machines, of which the following description, in connection with the accompanying drawing is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in grinding or polishing machines and the principal object thereof is to provide a ma chine which is adapted to grind or polish a vertical surface such as the side wall of a structure.

In many buildings of modern construction the walls are wainsooted or entirely formed of concrete construction, or surfaced with terrazzo, mosaic or other ceinentitious constructions embodying particles or masses of marble, granite or the like. Such surfaces at the present time are polished by hand tools and where hard substances such as granite are incorporated. in the wall the process is very slow and laborious.

By means of the present invention such walls may be polished quickly and as smooth and even surfaces produced as by hand polishing.

A further object of the invention is to prd vide a machine which will not only be capable of polishing vertical Walls but also of doing overhead Work such as grinding or polishing ceilings, arches, inclined surfaces, and which in short, will be capable of general utility.

In grinding and polishing it is desirable and practically necessary that a fluid such as water be applied to the surfaces being ground to facilitate the grinding operation and to prevent the flying of dust.

Another object of the invention is to provide means for automatically supplying to the abrading member a sufiicient amount. of liquid to accomplish these purposes.

Another object of the invention is to produce a machine of the class above described which can be easily transported and in which the polishing member will be adapted to polish a large area when placed in any desired position.

Another feature of the invention consists in providing means whereby the polishing tool may easily be assembled upon the machine and readily removed to permit the replacement of worn out abrasive members.

Other objects of the invention will. more fully appear from the following description and the accompanying drawings and will be pointed out more particularly in the annexed claims.

The drawings illustrate a preferred embodiment of my invention which is of general utility adapted to polish Surfaces, such as vertical surfaces, horizontal surfaces, either floor or overhead, also inclined or curved surfaces.

In the drawings,

Figure 1 is a side elevation partly in sec tion of a machine adapted for polishing vcr tical surfaces,

Fig. 2 is a similar view of the opposite side of a. machine,

Fig. 3 is a detail view of a portion of the polisher supporting arm and the extension thereof which carries the polisher showing the latter in position for overhead polishing,

Fig. l is a detail sectional view showing the manner in which the abrasive members are secured to the polishing tool,

Fig. 5 is a detail plan view of the polish ing tool illustrating its connection with a head carried by the grinding shaft.

Fig. 6 is a sectional view on lines (3*?) Fig. 5,

Fig. 7 is a detail view showing in section the power for supplying fluid to the grinder,

Fig. 8 is a bottom plan view of a different grinding tool, and,

Fig. 9 is a sectional view on line 9 -9, Fig. 8.

In polishing machines of the character above described it is desirable that the machine shall be portable in order that it may be moved along the wall or other surface being polished and also that the polishing member may be moved horizontally as Well as vertically.

The main structure therefore is desirably supported upon a platform provided with wheels or other antifriction devices to facilitate the movement of the machine.

The preferred means illustrated in the accompanying drawings comprises a platform 1 having at one end brackets 2 provided with supporting wheels 3 and at its opposite end With legs 4 adapted to rest upon the floor and frictionally retain the platform or carriage from movement during the operation of the grinder member. By this construction the device can be readily moved from one position to another by raising the legs 4 from the floor and pushing the same along on the wheels 3.

A. main frame or standard is mounted upon the platform and preferably comprises a base 5 having end pieces 6 and 7 rising llmrefroin and a top 8. The end pieces 6, 7, desirably may be narrower at the top and bars 9 may conveniently be secured near the top to provide means for elevating the entire structure and transporting it from place to place. The base 5 desirably is secured to the platform 2 by a central pivot or king bolt 10 so that the frame or standard may be ro taled about a vertical axis. An annular nietallic plate 11 desirably is interposed between the platform and the base 5 of the super trlu'ture to reduce the friction suflicicnlly m that the supcrstrncture may be readily rotated upon its vertical axis but which will intelposc a sufiieient amount of friction to retain the superstructure in any adjusted position while the polishing operation is being performed. A locking pin 12 passing through the bottom 5 of the stand and adapted to enter into one of a series of holes may be utilized to lock the frame in adjusted position upon the platform.

The frame or standard conveniently may be divided by a partition into two compartments or sections, one to receive a motor 13 for actuating the polishing member and the other to receive a tank or other receptacle 14. for the fluid which is supplied to the grinding member in a manner which will hereinafter be described.

in the construction illuz's-trated herein the pulley 15 of the motor 13 drives a belt 16 which passes over a pulley 1T rotatal'ily mounted upon a shaft 18 which preferably is a rock shaft carried by suitable brackets 19 which are secured to the top 8 of the frame or standard. The pulley 17 is provided with a hub 20 carrying a sprocket wheel 91 for driving the grinder and also with an eccentric 25 connected by a pitman 23 to the plunger 24 of the pump whirh supplies liquid to the polishing member in a manner which will hereinafter be described. The grinding member desirably is carried upon a pivoted arm consisting of articulated members, one of said nlfll'llbfils desirably being counterbalanced by a. counterweight or spring so that it may readily be moved about the pivotal support, the other member which forms the extension thereof being connected pivot-ally to the free end of the counterbalanced member in such a way that its end may be swung through a circular arc. The grinding member is mounted upon a shaft preferably extending at right angles to the axis of the extension and adjustably connee-ted thereto by means which will permit the axis of the grinding member to be post tioncd in any desired relation to (he sup porting arm.

As illustrated herein the grinder support ing arm comprises two sections, the lower .tectimi consisting of two parallel members 25, 26 which are provided with bosses 27, 26 secured to the shaft 18, the arm 24': desirably being provided with the downward extension 29 to which is secured a bar 30 with an adjustable counterweight 3 l. The rock shaft 18 also n'iay have an arm 32 secured thereto adapted to support a similar rod 33 carrying an additional counterweight 3a. in practice either or both of these counterweights may be utilized as may be found convenient.

The members 25, 26 of the counterweighted arm desirably are extensible to provide means for tightening the driving chain for the grimilcr. This is accomplished by securing to the ends of the members 2:3 at plates 255, 36 having tl eir ends turned over and apcrtured to form bearings to receive a shaft 37. The plates 35, and 36 are secured to the members 26 by bolt and slot connections 38 and are retained in adjusted position by thrust screws 39 mounted in lugs or ears 40 extending outwardly from the members .25. 26 and abutting flanges 41 upon the ends of the extensions 35, 36.

The grinder supportii'ig arm extension is pivotally mounted upon the shaft 37 and is adapted to be swung in the same vertical plane or a. parallel vertical .)lane to that in which the rounterWe-ighted arm moves. This extension comprises a yoke 42 having bosses 43, 44 journaled upon the shaft 37, said yoke being provided with a hub to which is apertured to reteive a tubular nu-nnber $6 of such length as to give the desired amount of sweep to the grinding member.

The tubular member 46 is provided near its end with a collar 47 havin-ga flange provided with a plurality of holes to receive bolts or screws for attaching the same to a hub 49 of a hollow casing or head 50 containing gearing for actuating the grinder shaft. The end of the tubular extension v46 preferably passes through the hub and is provided with a bushing for a countershazft 51 carrying a miter gear 52 engaging a co operating miter gear 53 journaled in an extension 54 of said casing. The grinder shaft 55 is slidably mounted in the hub of the gear 53 and is provided with a feather 56 fitting in a groove in said hub so that the grinder shaft is adapted to be rotated bythe gear wheel and is capable of reeinroeatory movement axially of the hub of said gear. The casing or head 50 is provided with an extension 57 having a tubular member 58 seated therein. This tubular member has its end closed by a plug 59 which serves as a seat for a helical spring 60 Which bears at its opposite end upon the member 61 of a thrust bearing which coiiperates with the enlarged end 62 of the grinder shaft. A bushing 63 near said extension 57 preferably is also provided for the grinder shaft.

The free end of the grinder shaft is spherical in form and engages a correspondiug seat 64 in the grinder head 65. The grinder head 65 is in the form of a circular plate having lugs 66 extending from one side thereof and a central boss 67 extending from the opposite side. The head 65 is secured to the grinder shaft by a key 68 engaging the lugs 66 and passing through the shaft 55.

A keeper plate 69 screwed or bolted upon the lugs 66 serves to prevent the ready removal from the shaft 55. The plate 69 preferably is circular in form and sufiiciently extended beyond the lu s 66 to present a grip for the workman y means of which the grinder shaft may be thrust backwardly against the force of the sprin 60 to permit the removal of the grinder tool The grinder head 65 has an enlarged circular flange 70 provided with oppositely disposed concentric slots 71 having centrally enlarged portions 72, thus forming bayonet slots ada ted to receive headed studs carried by t e polishing tool and to lock the polishin tool upon said head when it is rotated in either direction relatively to the head.

Various forms of grinding tools may be utilized in connection with the mechanism above described, two desirable forms being shown in the drawings, one form of polishing tool which is illustrated in the main figures of the drawing and in Figs. 4 and 6 comprises a circular plate 73 having three ribs or bosses 74 provided with conical apertures adapted to receive the tapered ends of cylindrical or conical abrasive members 75. The plate 73 is provided with screws or studs having heads adapted to pass through the apertures 72 in the head 70 and when rotated in either direction. in the bayonet slot 71 to lock the tool firmly upon the head. By thus providing a tool having three abrasive members spaced at substantially equal distances apart the abrasive members are all maintained in contact with the surface being polished at all times.

The other form of polishing tool which is illustrated in Figs. 8 and 9 is provided with a series of abrasive members prefer ably having concentric inner and outer faces and having the forward faces inclined to the radii of the tool so that the fluid encountered by the tool will first be forced toward the center of the tool thereby preventing the abrasive surface from running dry. These abrasive members preferably are carried by a disk 730 having concentric ribs 740 connected by partitions or webs 7 41 and 742 the partitions 741 being radially of the disk 730 and the partitions 742 inclined to the radii of said disk to conform to the shape of the abrading blocks 750.

A sufficient number of sockets thus constructed may be provided to permit the use of one or more convex circular series of abrading disks and the abrading disks may be on the inner and outer circles and may be in staggered relation as illustrated in Fig. 8. The disk 730 is provided with a central aperture adapted to receive the bosses 67 upon the head and also is provided with studs or screws corresponding with screws 76 by means of which the tool may be secured to the rotating head.

In order to supply a fiuid such as water to the polishing member the shaft 55 is provided with an axial aperture and the boss 67 with a communicating aperture through which the fluid may be delivered to the grinder. A tube 77 leads to or through the aperture in the shaft and is connected at its opposite end to a flexible pipe 78 leading from the pump 79.

The counter shaft 51 which actuates the grinder shaft is provided at its lower end with a gear 80 which meshes with a ear 81 rotatably mounted upon the shaft 3 at the end of the counterweighted section of the grinder supporting arm. The hub 82 of the gear 81 has a sprocket wheel 83 which is driven by a chain 84 passing over the sprocket wheel 21 upon the hub 20 of the pulley l7. Vibration of the chain may be prevented by a roller 85 carried upon an arm 86 adjustably secured to a rod 87 connecting the members 25, 26 0f the counterweighted section of the grinder supportin arm.

It will be obvious that in the operation of the machine the electric motor 18 will drive the pulley 17 through the belt 16 and thereby cause the sprocket chain 8 1 to rotate the gear 81 and through it the companion gear 80 and the shaft 51 which is geared to the grinder shaft. By reason of the pivotal connection between the counterweighted portion of the grinder supporting arm and its extension 46 it will be obvious that the grinding tool may be manipulated through an are having the axis of the shaft 37 as its radius and that the shaft 37 may be moved through an are having the axis of the shaft 18 as its radius.

By reason of this compound movement a large area of surface may be treated by the grinder without moving the machine from a fixed position. When such a surface has been covered the machine may be moved forward and an additional surface treated in like manner.

Any suitable means may be provided for supplying water to the polishing member. The pump illustrated herein comprises a piston chamber 88 in which the piston 24:

reciprocates and a communicating chamber 89 connected by a pipe 90 to the fluid tank 14. A valve 91 such as a spring actuated ball valve permits the water to be drawn up into the chamber 89 upon the suction stroke of the piston and a similar ball valve 92 in a communicating chamber 93 provides means whereby the fluid may be forced from the chamber 89 through the chamber 93 and the pipe 78 to the grinder.

In order to govern the amount of water supplied to the grinder the chamber 93 is provided with a relief valve from which a tubular extension 95 of the pump casing communicates, by a flexible pipe 96, with the tank 1% so that the overflow will be discharged back into the tank. The discharge outlet 94- is provided with a valve 97 supported by a spring 98 which rests at its lower end upon a shoulder 99 of a hollow nut 100 which is adjustably screwed upon the downward extension 95 of the pump casing. the nut 100 being provided with a nipple 101 to which the flexible tube 96 is secured. By adjusting the nut 100 up and down upon the extension 95 the compression of the spring 98 may be regulated and the amount of back pressure required to o crate the relief valve thereby controlled. y this means the amount of fluid delivered to the grinder may be nicely adjusted since by increasing the compression of the spring 97 a greater amount of pressure will berequired to open the relief valve and consequently an in creased amount of fluid will be delivered to the grinder. By rotating the nut 100 in the reverse direction the amount of fluid deliv ered to the grinder may be corresmmdingly decreased.

In Fig. 3 a portion of the machine is illustrated with the grinder in position to operate upon a ceiling or other overhead surface. This is accomplished by swinging the counterweighted portion of the grinder arm in a vertical position and applying a. counterweight to the extension 46, the casing 50 having in the meantime been adjusted at right angles to the position shown in Figs. 2 and 3. Theextension 46 may be sustained in substantially horizontal position for overhead work by an arm 102, having a counterweight 103, the arm being secured to the hub 45 of the yoke 4:2.

When in the position illustrated in Fig. 3 the grinder can be moved through a wide horizontal arc and by rotating the main frame about the vertical pivot 10 a large area of overhead surface may be polished with the machine in one position. By moving-the machine along the floor practically all of the surface of the ceiling may be polishod. The pivotal movement of the frarr-i upon the carriage in combination with the pivotal movement of the counterweighted portion of the grinder supporting arm and its pivoted extension permits the grinder also to be moved into almost any position and thus adapts the machine for polishing plane, curved, or inclined surfaces.

Furthermore the yielding thrust upon the grinder, combined with the universal connection of the grinder head with the tool enables the grinder properly to operate upon a surface which is not exactly parallel to the plane in which the grinder supporting arm is moved. In the practical construction of the machine the arm 33 with its counterbalance 34 may be detached from the rock shaft 18 and secured in the head 45 of i grinder arm extension 46 in place of using the additional rod 102 with its counterweight 103.

Various forms of polishing or grinding members may be used, such as cylindruor dish like abrading members or members having profiled faces with edges adapted for polishing the curved fillets joining vertical and horizontal surfaces or for polishing moldings or other surfaces usual in building construction.

The construction. of the machine adapts it for practically universal use since the grinder may be moved in vertical planes for polishing walls, in horizontal planes for polishing ceilings, or floors, or may be operated to polish inclined or curved surfaces in substantially any location.

In the operation of the machine the grinder head is held against the surface being operated upon by the yielding pressure of the spring 60 and by reason of the universal connection of the grinding head to the grinder shaft the tool is capable of proper manipulation upon almost any form of surface.

It will be understood that the embodiment of the invention disclosed herein is illustrative in character; that while the particular embodiment illustrates a rotating grinding member the supporting means are equally adapted to sustain a non-rotatable grinding member and permit its manipulati'ori either for the purpose of polishing side walls or overhead surfaces; also that various changes in structure may be made within the meaning and scope of the following claims, which are designed to cover broadly any form of Wall polishing machine comprisi an articulated grinder supporting arm with or without automatically operating means for actuatingthe grinder,and also to cover the necessary improvements used in combination with said grinding mechanism.

Having thus described my invention, what I claim as new and desire to secure by Letters'CPat-aent is:

1. A wall polishing maohine.comprising a stand, an arm pivotally mounted thereon formed of pivotally connected sections movable in vertical planes, and polishing means counterbalanced at one end and carried by the free and of said arm presenting a Hat polishing face lying in a vertical plane, whereby said polishing means is adapted to be moved in any direction upon a vertical wall and thereby to polish the surface thereof.

2. A wall polishing machine comprising a platform, a stand mounted upon said platform and rotatably adjustable about a vertical axis, an arm pivotally mounted upon said stand, formed of pivotally connected sections movable in vertical planes, polishing means carried at the end of said arm and presenting a polishing face lying in a vertical plane.

3. A polishing machine comprising a platform, a stand mounted upon said platform rotatably adjustable about a vertical axis, means for securing said stand in adjusted positions, an arm pivotally mounted upon said stand and constructed of pivotally connected sections movable in vertical planes, a rotatable polishin member carried by and projecting lateral y from the end of said arm and means for rotating said polishing member.

4. A wall polishing machine comprising a stand, an arm pivotally mounted thereon formed of articulated sections movable in vertical planes, polishing means carried by said arm and means for automatically supplying fluid to said polishing means.

5. wall polishing machine comprising a stand, an arm pivotally mounted thereon formed of articulated sections movable in vertical planes, a rotatable polishing member carried by said arm, means for actuating said polishing member and automatic means for supplying fluid axially to said rotatable polishing member.

6. A wall polishing machine comprising a stand, an arm pivotally mounted thereon, formed of articulated sections movable in vertical planes, polishing means carried by and pro ecting laterally from the free end of said arm and presenting a flat vertical polishing face and means for yieldably forcing said polishing means against the surface being treated. I

7. A wall polishing machine comprising a stand, an arm pivotally mounted thereon formed of articulated sections movable in Nertical planes, a rotatable polishing mcmber carried by said arm, means for rotating the same, resilient means for forcing sai polishing member, against the surface being treated and means for supplying liquid to said polishing member.

. 8. A wall polishing machine comprising a stand, a shaft mounted thereon, an arm consisting of articulated members, one of which is formed of parallel spaced members rovided at the other with a connecting s aft, the

:other section being pivotally mounted upon said connectin shaft and forming an ex tension, a shagjournaled in the free end of said extension, a polishing member secured to said shaft by a universal joint and means for rotating said polishing member.

9. A wall polishing machine comprising a stand, a shaft mounted thereon, an arm consisting of articulated members, one of which is formed of parallel spaced members counterbalanced at one end and provided at the other with a connecting shaft, the other section bein pivotally mounted upon said connecting s aft and forming an extension,a head on said extension, a transverse shaft in said head, a polishing member carried at the end of said shaft and means for rotating the shaft of the polishin member and resilient means engaging sai fl shaft and operating to force the polishing member against the surface being treated.

10. A wall polishing machine comprising a stand, a rock shaft mounted thereon, an arm consisting of articulated sections, one of which is formed of parallel spaced members counterbalanced at one endand provided at the other with a connecting shaft, the other section comprising a tubular extension pivotally mounted upon said connecting shaft, a shaft on said tubular extension, a head mounted on said tubular extension, a grinder shaft mounted in said head, a grinder secured to said shaft and gears in said head adapted to transmit rotation to said grinder shaft from the shaft in said tubular extension.

11. A wall polishing machine comprising a stand, a rock shaft mounted thereon, an arm consisting of articulated sections, one of which is formed of parallel spaced members counterbalanced at one end and pro- 105 vided at the other with a connecting shaft, the other section comprising a tubular extension. pivotally mounted upon said, connecting shaft, a head mounted on said tubular extension, a grinder shaft mounted 110 in .said head, a grinder secured to said shaft, means for rotatingesaid grinder shaft and a yieldable thrust aring for said grinder shaft.

12. A wall polishing machine comprising 115 a stand, a rock shaft mounted thereon, an arm consisting of articulated sections, one of which is formed of parallel spaced members counterbalanced at one end and provided at the other with a connecting shaft, the other 120 section comprising a tubular extension ivotally mounted upon said connecting shaft, a

arm consisting of articulated sections, one of which is formed of parallel spaced members counterbalanced at one end and provided at the other with a connecting shaft, the other section comprising a tubular extension pivotally mounted upon said connecting shaft, a head mounted on said tubular extension, a grinder shaft mounted in said head, a beveled gear feathered upon said shaft, a cooperating beveled gear having a shaft extending longitudinally of said tubular section and means for rotating the same con sisting of inter-meshing gears, one of Which is mounted upon said shaft and the other upon the connectinshaft of said arm members, a sprocket Wheel rigidly connected to the latter, a sprocket chain connecting said sprocket wheel with a sprocket Wheel upon. said rock shaft, a pulley on said sprocket wheel and a motor driving said pulley.

14. A wall polishing machine comprising a frame, a shaft supported upon said frame, an arm comprising articulated sections, one of which is formed of parallel extensible members counterbalanced at one end and. provided at the other With a connecting shaft, the other section comprising a tubular extension pivotally mounted upon said connecting shaft, a head mounted on said tubular extension, a grinder shaft mounted in said head, a grinder secured to said shaft and means for rotating said grinder shaft including a gear and sprocket upon saidrock shaft, a sprocket wheel chain connecting; said sprocket wheel and an electric motor for rotating the sprocket wheel upon said rock shaft.

15. A Wall olishing machine comprising a frame, a sha 1: supported on said frame, an arm having articulated sections, one of which is formed of parallel extensible members counterbalanced at one end and pro vided at the other with a connecting shaft, the other section comprising a tubaiar extension pivota-lly mounted upon said connecting' shaft, a grinder supporting head mounted upon said tubular extension, means for adj usti'n said head radially whereby the rinder may lae presented either to verticaior Eorizontal surfaces, a grinder shaft mounted in said head, a, grinder secured to said shaft and means for rotating said grindershaft.

1'6. A wall polishing machine comprising astahd, a counterbalanced articulated arm mountediipon said stand, a counterhal arno ing extension pivotal-1y mounted on said arm, a polishing member carried by said extension, and fneans for adjusting said polishing meinher'relatively to said arm whereby vertical surfaces or horizontal overhead surfaces may be polished;

17. A Wall polishingmachine comprising a stand,-a counterbalanced articnlhted' ar-in mounted-upon said stand, a; polishing member carried lay-said arm, 'andnieans icr yieldably forcing said polishing member against the surface being polished.

18. A. Wall polishing machine coinprising a stand, a counterbalancod arm pivotally mounted upon said stand having an exten sion pivotally connected tl'uu'oto, a shaft cairrying a polishing tool journaled in the free end of said extension, means for counterbalaucing said extension whereby the polishing tool will he held against an overhead surface and. means for rotating said polishing tool.

19. A polishing machine comprising a pivotally mounted articulated arm, a grinder shaft mounted in bearings at the end of said arm and a head artioulated hpon said grinder shaft and a polishing tool secured to said head and resilient means for forcing said shaft endwise whereby the polishing tool will be caused yieldably to engage the surface being treated.

20. A polishing machine comprising a pivotall y mounted articulated arm, a grinder shaft mounted in bearings at the end of said arm, a head articulated to said shaft having a flange provided with slots having enlarged apertures, a polishing tool comprising a plate carrying an abrasive mem her and provided with studs having enlarged heads adapted to pass through said apertures and by lateral rotative movement in said slots to retain said polishing tool upon said head and means for rotating said shaft.

21. In a polishing machine a. rotary grinder comprising a head and means for rotating the same, said head having a flange provided with slots having enlarged apertures and a polishing member consisting of a plate carrying an abrasive member and provided with studs having enlarged heads adapted to pass through said apertures and by lateral rotati've movementin said slots to retain the polishing tool upon said head.

22. In a polishing machine a rotary grinder comprising a head and means for rotating the same, said head having a central boss and a surrounding flange provided with slots having enlarged apertures, a polishi n member comprising a plate carrying an a asive member and havin a central aperture adapted to said boss and provided with studs having enlarged heads adapted to pass through said aperturesand by lateral rotative movement of said slots to retain the polishin'. too'l upon said head 23. A polishing machine comprising a stand, a shaft supported upon said stand, an articulated gzind'ersup orting arm can ried' by said shaft, a, griner on said arm; means for rotating said grinder including a pulley mountedupon said shaft, a s ectra chain driven by said pulley, an ccentriccarriedby said'pu'l'ley,a pump actuatedhy' said eccentric for supplyingfluid to the grinding member and means for adjusting the pressure of the fluid supplied by said pump.

24. A polishing machine comprising a stand, an arm pivotally mounted thereon formed of articulated sections, a rotatable polishing member carried by said arm, means for actuating said polishing member, a pump for supplying fluid to said polishing member and means for regulating the amount of fluid supplied to said polishing member.

25. A polishing machine comprising a stand, an arm pivotally mounted thereon Copies oi this patent may be obtained for live cents each, by addressing the formed of articulated sections, a rotatable polishing member carried by said arm, means for actuating said polishing member, a pump for supplying fluid to said polishing member and means for regulating the amount of fluid supplied to said polishing member consisting of a relief valve for said pump and means for adjusting said valve.

In testimony whereof I have signed my name to this specification.

ERCOLE OAVIOCHI.

Commissioner of Patents.

Washington, D. 0.

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