US2063931A - Automatic cylinder grinder - Google Patents

Description

Dec. 15, 1936. M. c. HUTTO AUTOMATIC CYLINDER GRINDER 5 Sheets-Sheet 1 Filed Dec. 24, 1925 INVEN O R. Mean /V 6T 7%? 0 ATTORNEY.

Dec. 15, 1936. C -r AUTOMATIC CYLINDER GRINDER 2 M W e m S 3 m n0 A L N p k x3 $5 m I nav m IT bv INVENYTOR. Mesa-w 6 55,

A T TORNE Y.

Dec. 15, 1936.

M. C. HUTTO AUTOMATIC CYLINDER GRINDER Filed Dec. 24, 1925 3 Sheets-Sheet 3 5 I INVENTOR.

Z0: 7 M/Pma/ 6f 756270 ATTORNEY.

further expansion.

Patented Dec. 15, 1936 UNITED STATES AUTOMATIC CYLINDER GRINDER Marsden C. Hutto, Detroit, Mich., assignor, by

mesne assignments, to The Carborundum Company, Niagara Falls, N. Y., a corporation of Pennsylvania.

Application December 24, 1925, Serial No. 77,430

40 Claims.

This invention relates to automatic cylinder grinders and the object of the invention is to provide a grinder which may be set to grind a cylinder to a certain diameter.

Another object of the invention is to provide a grinder of the character described consisting of a series of grinding stones expandible radially to grind the inner walls of a cylinder, the said stones being expandible to a certain diameter and upon reaching the said diameter are prevented from One of the principal objects of the invention is to provide a precision tool for production Work. For instance, in grinding the cylinder of an automobile engine, the cylinders are first bored and then must be ground to exact size so that the .cylinders are of the same diameter throughout and are provided with a finished polished surface.

For this purpose the grinder is made so that the minimum diameter of the grinding machine is slightly less than the diameter of the bored hole and as the hole is being ground the diameter of the grinding stones is gradually increased to a maximum at which point the. ground cylinder is of the exact desired diameter and is provided I with a polished ground surface which is much smoother than a bored hole.

Another object of the invention is to provide a. means whereby the grinder may be set at its minimum diameter before being inserted in the cylinder to be ground and is automatically released from the set position as soon as the grinder is rotated, means being provided for continuously expanding the stones as the metal is ground from the walls of the cylinder.

These objects and the several novel features of the invention are hereinafter more fully described and claimed and'the preferred form of construction by which" these objects are attained is shown in the accompanying drawings in which Fig. l is an elevation of a cylinder grinder embodying my invention.

Fig. 2 is an enlarged longitudinal section through the grinder.

Fig. 3 is a reduced section taken on line 3-3 of Fig. 2.

Fig. i is a reduced section taken on line 6-51 of Fig. 2.

Fig. 5 is a view of the automatic adjusting device partly in section.

Fig. 6 is an end view of the automatic adjusting device. I

Fig. 7 is a section taken on line 7-1 of Fig. 2.

The grinder comprises a hollow body member I shown in Figs. 1 and 2 having two raised portions 2 and 3 which are hexagonal in form as shown in Fig. 7. The grinding stones 4 are each mounted in a holder 5 having two pins 6 extending there- 'from. These pins 6 are shaped at the ends to fit the cones 1 and 8 which are movable longitudinally of the hollow body member I. The cone 8 is provided with a slot 9 shown in Fig. 2 in which a pin 9! l engages to prevent the cone 8 from turning and this cone is threaded onto the lower section ll] of an adjusting shaft Ill extending through the cone 1. This shaft section is provided with a collar or head H at its upper or rear end seating in the bottom of the recess ii! in the upper end of the cone 1. The upper section or portion I3 of the adjusting shaft extending from the collar H is square in cross section and by turning this shaft section l3 in one direction the shaft section 80 is threaded into the cone 8 to draw the cones l and 8 together and upon turning the shaft section l3 in the opposite direction the coiled spring 14 moves the cones apart as the shaft section I0 is unthreaded from the cone 8. By this movement of the cones l and 8 which ride in engagement with the pins 6 the grinding stones may be moved radially outward from the body! and to hold the pins 6 in contact with the cones wire springs l5 shown in Fig. l are secured to the body 6 by the screw Hi, the ends of each spring I5, as shown in Fig. 2, extending through slots H in the body portions 2 and 3 and engaging in apertures provided therefor in the respective pins 6. A spring I5 is provided for each stone so that the pins 6 are held at all times in engagement with the cones l and 8. The body member l is connected to a cylindrical driving member or shaft it by means of an intermediate hollow member l9 through which the square shaft It extends. The member 89 is provided on its lower or front end with two pins engaging in bayonet slots 2i provided in the rear end of the body member 0. The body member it is provided with bayonet slots 22 shown in Figs. 1 and 5 and the upper or rear end of the member l9 engaging in the body member i6 is provided with pins 22H engaging in the slots 22 so that when the driving member 88 is rotated the member it rotates the body member 0. As shown in Fig. 1 the driving member i 8 is provided with a shank 23 adapted to be secured in a drill chuck by which the grinder is rotated. As shown in Fig. 2 a hub member 2 3 is rotatably mounted within the driving member 08 and is provided with a square aperture iii therethrough through which the square shaft it extends. A gear 25 is secured to the member 24! and meshes with a gear 26 on the driving member i8 which is an idler gear and is rotatably mounted on its axis in the slot 21! cut in the driving member l8. The idler gear 26 meshes with a ring gear 28 which is secured in the rear end of the sleeve 29 which is rotatable on the driving member 68. A set screw 30 extends through the annular member 29 and is provided with an end 3| engaging in the annular groove 32 in the body member I8 preventing movement of the sleeve 29 longitudinally of the member I8 and allowing rotative movement of the sleeve 29 thereon. By this arrangement when the sleeve 29 is turned in relation to the driving member I8 the ring gear 28 is also turned which through the idler gear 26 rotates the gear 25 and the member 24 which turns the shaft sections I8, I3 and tends to move the cones I and 8 toward each other thus moving the grinding stones outwardly by forcing the pins 6 outwardly. A member 33 is secured to the driving member I8 by the key 34 and by the set screw 35 and this member, as shown in Fig. 1, is provided with graduations on the flange thereof and with an extending pin 36. By this arrangement the pin 38 is secured in stationary position in relation to the member I8. A member 31 shown in Fig. 2 is positioned about the sleeve 29 and carries a pointer 38 adapted to engage the pin 38 as the sleeve 29 is turned on the driving member I8. The member 3'! is provided with a pin 39 engaging in a notch 48 in the sleeve 29 and as shown in Fig. 4. A series of notches 48 is provided about the member 29 which open into an annular groove 4I. By this arrangement the annular member 31 may be moved to the right of Fig. 2 until the pin 39 engages in the annular groove H at which time the member 31 may be turned until the pointer 38 is opposite any desired reading on the member 33 whereupon the member 31 may be moved back to position with the pin 39 engaging in one of the notches 48. The driving member I8 is provided with a key way 42 shown in Fig. 2 in which the end 43 of a coiled spring 44 engages, the opposite end 45 of this spring extending into one of the notches 48 in the member 29 and engaging in the aperture 41 of a sleeve 48 which is rotatable on the member 29. The end 45 of the spring locks the sleeve 48 and sleeve 29 together so that they rotate on the driving member I8 as a unit. The spring 44 tends to turn the sleeves 29 and 48 as a unit until the pointer 38 strikes the pin 38 at which time the stones 4 are expanded to the maximum diameter. By reversing the rotation of the sleeves 29 and 48 as a unit the ring gear 28 through the idler gear 28 turns the gear 25 and shaft sections I8, I3 to move the cones I and 8 apart which allows the springs I5 to force the stones inwardly thus reducing the operating diameter of the stones until the pointer 38 strlkesthe opposite side of the pin 38 at which time the stones are at the minimum outside diameter for the respective setting of the pointer 38. These stones must be held at a minimum diameter while the tool is being inserted into a cylinder to be ground and for this purpose I have provided a pin 49 which is pressed outwardly by the spring 58 and is thus normally held out of engagement with the slots 5| in the end of the driving member I8 shown in Fig. 2. The pin 49 and spring 58 are mounted in a casing 52 which is secured to the end of the sleeve 48 as will be understood from Fig. 6. The pin 49 is prevented from ejection outwardly of its casing by means of a pin 98 secured therein and riding in a slot 9| of the casing 52. The driving member I8 is held stationary while the sleeve 48 and sleeve 29 thereon are turned in a clockwise direction until the pointer 38 strikes the opposite side of the pin 36 at which time the stones are at the minimum grinding diameter. At this time the hook end 53 of the pin 49 is forced manually downwardly against the tension of the spring 58 into one of the longitudinal slots 5| in the driving member I8.

These slots 5| are so arranged that the hook end 53 engages under one edge thereof and the spring 44 which tends to turn the member 48 in a counter clockwise direction holds the pin 52 in engagement in the side of the respective slot 5I with sufficient tension to prevent the pin 49 from rising due to the tension of the spring 58. At this time the entire device is locked with the stones at the minimum diameter and the shank 23 is secured in a drill chuck and the stones may be positioned in a cylinder to be ground.- The drill chuck rotates the driving member I8 in a counterclockwise direction and as soon as the member I8 starts to rotate the hook end 53 due to the inertia of the part 48, is released allowing the pin 49 to rise by the tension of the spring 58. When this occurs the spring 44 is released to rotate the sleeves 29 and 48 as a unit in relation to the driving member I8 in a counter clockwise direction which movement is imparted through the gears 28 26 and 25 to the shaft sections I8, I3 which feed the cones I and 8 toward each other thus expanding the stones until they engage the walls of the cylinder to be ground. The rotation of the driving member continues and due to the spring 44 the stones are expanded as rapidly as the material is ground from the cylinder walls. Thisgrinding continues until the pointer 38 strikes the opposite side of the pin 36 which is the maximum diameter of the stones and as the stones free themselves in the cylinder by the grinding operation the exact inside diameter of the cylinder is reached. To remove the stones from the cylinder the knurled face of the sleeve 48 is grasped in the hand and is reversed in rotation against the tension of the spring 44 until the stones 4 are free, at which time the grinder may be lifted out of the cylinder. To increase the tension of the spring 44 the member 29 is provided with notches 48 in the edge thereof as shown in Fig. 5 and is also provided with an annular groove 54 shown in Fig. 5 which is wider than the ends 55 of the set screws 58 which are secured in the outer sleeve 48. By this arrangement the sleeve 48 which carries the spring end 45 may be moved to the right of Fig. 5 to raise the spring end 45 out of the respective notch 46 and the member 48 may be turned in relation to the member 29 to position the spring end 45 in another of the notches 46 and thus vary the tension of this spring. The tendency of the spring 44 to contract then holds the spring end 45 in engagement in the respective notch 48 and holds the sleeve 48 in the position shown in Fig. 5. By this arrangement the tension of the spring 44 may be adjusted and by means of the pin 39 in the annular member 3'! which may be positioned in the different notches 48 as will be understood from Figs. 2 and 4, the device may be set to grind various diameters within the limits of the device.

The pins 28, 22I at the lower and upper ends of the shaft I9 engaging with the bayonet slots 2I in the tool body I and the driving member,

I8, respectively, form universal connections between this body I, shaft I9, driving member I8, which leaves the grinding tool free to adapt itself to the surface of the work even though the tool is not in perfect alinement with the driving member I8 and shank 23, and the latter is in a relatively fixed position.

From the foregoing description it becomes evident that the device is very efiflcient in oper ation, will automatically increase the grinding diameter from a minimum to a maximum. will grind to a desired diameter to which it is set and provides a device which accomplishes the objects described.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is 1. An automatic cylinder grinder comprising a hollow body member, a series of grinding stones carried by the body member, a shaft extending into the hollow body member and adapted upon rotation in one direction to move the grinding stones radially from the body member and adaptv ed upon rotation in the opposite direction to allow movement of the grinding stones inwardly towards the body member, a head connected to the body member to rotate the body member therewith, a sleeve rotatable on the head, a ring gear carried by the sleeve, an idler gear rotatably mounted in the head and meshing with the ring gear, a gear meshing with the idler gear and secured to the said shaft, a spring tending to rotate the sleeve in one direction on the head and resisting rotation of the sleeve in the opposite direction on the head, means limiting rotation of the sleeve in either direction on the head, means for adjusting the tension of the spring, and manually operable means for securing the sleeve from rotation against the tension of the spring the said means being automatically released upon rotation of the head at the beginning of the grinding operation.

2. A grinding apparatus comprising a supporting body, a plurality of grinding members movably mounted on said body and capable of being expanded and contracted for enlarging or reducing the working diameter of said grinding members, a driving member connected with said body, and means for adjusting the working diameter of said grinding members comprising spreading elements arranged within the body and operating on said grinding members, controlling means mounted on said driving member and operable manually from the exterior of the apparatus independently of said driving member, and motion transmitting means connecting said manually operable controlling means with said spreading elements.

3. A grinding apparatus comprising a supporting body, a plurality of grinding members movably mounted on, said body and capable of being expanded and contracted for enlarging or reducing the working diameter of said grinding members, a driving member, a hollow shaft connected at its opposite ends with said body and said driving member, and means for adjusting the working diameter of said grinding members comprising spreading elements arranged within the body and operating on said grinding members, controlling means mounted on said driving member and operable manually from the exterior of the apparatus independently of said driving member, and motion transmitting means connecting said manually operable controlling means and said spreading elements including a rod arranged lengthwise within said hollow shaft.

4. In a grinding apparatus comprising a'supporting body, a plurality of grinding members movable radially on said body and capable of being moved outwardly and inwardly relatively to the axis of the body for enlarging or reducing the working diameter of y the several grinding member, a driving member, a hollow shaft, universal connection between one end of said hollow shaft and said body, another universal connection between the opposite end of said hollow shaft and said driving member, and means for adjusting the working diameter of said grinding members comprising spreading means arranged within said body and operating on said grinding members, controlling means mounted on said driving member and operable manually from the exterior of the apparatus independently of said driving member and motion transmitting means connecting said manually operable controlling means with said spreading means including a rod extending lengthwise through said hollow shaft and said universal joints.

5. In a cylinder hone driving and adjusting mechanism, a sleeve constituting a drive member. a hollow shank driven thereby, a clutch member within the sleeve guided for rotation relative thereto, a spindle keyed to said clutch member and extending through said shank, a co-operating clutch member in said sleeve normally rotatable in unison therewith and held in engagement with the first mentioned clutch member, but movable for a limited distance out ofengagement with said first mentioned clutch member and forwardly with reference to the sleeve, whereby the latter may then advance through a partial rotation without driving said spindle.

6. A grinding apparatus, comprising a supporting body, a plurality of grinding members mounted on said body and movable thereon toward and from the surface to be ground, diameter adjusting means for enlarging or reducing the diameter of said grinding members, a driving member, an intermediate power transmitting member having a swivel connection at one end with saiddriving member, and a swivel connection at its opposite end with said body, manually controlled adjusting means mounted on said driving member, and intermediate adjustment means extending along said intermediate power transmitting member and operatively connected with said manually controlled adjusting means and said diameter adjusting means.

7. The combination with a cylinder hone having radially adjustable stone carriers, of a drive member, a stopmember operatively engageable by the drive member and normally rotatable with the hone when so engaged, means for effecting a limited relative rotational adjustment of the stop member in advance of the drive member to permit a partial initial rotation of the drive memher before the stop member and the hone beginto rotate, and screw threaded means actuated by said partial initial rotation to adjust said carriers outwardly.

8. In a cylinder hone driving and adjusting mechanism, a drive member, a hollow shank driven thereby, a spindle extending into the shank and co-axial therewith. means for connecting the drive member to the spindle to cause them to rotate together, means for selectively setting said connecting means to permit a predetermined partial initial rotation of the drive member before the spindle begins to rotate, and screw threaded means operable by sa d partial initial rotation to expand the hone.-

9. In a device of the character described, a hone, a drive member, a hollow shank driven by said drive member and operat vely connected with the hone, a spindle extending within said shank, a stop affording a driving connect on between said drive member and said spindle, sa d stop having a measured adjustment in advance of the drive member to permit a partial initial.

- rotate, and screw threaded means operable by said partial initial rotation to expand the hone.

10. A control head for a grinding head or like object comprising, in combination, a body mem her, a hollow shaft secured to said body member for driving movement therefrom, a second shaft disposed within said hollow shaft, a gear nonrotatably mounted relative to said second shaft within said body member, a collar rotatably mounted on the exterior of said body member, gear means connecting said collar and said gear, means for limiting the rotation of said collar relative to said body member, and spring means for turning said collar forwardly.

11. A control head for a grinding head or like object comprising, in combination, a body member, a hollow shaft secured to said body member for driving movement therefrom, a second shaft disposed within said hollow shaft, a gear nonrotatably mounted relative to said second shaft within said body member, a collar rotatably mounted on the exterior of said body member, gear means connecting said collar and said gear, and means for limiting the rotation of said collar relative to said body member comprising interengaging means stationary relative to said body member and said collar respectively and one of which is disposed in the path of movement of the other thereof.

12. A control head for a grinding head or like object comprising, in combination, a body member, a hollow shaft secured to said body member for driving movement therefrom, a second shaft disposed within said hollow shaft, a gear nonrotatably mounted relative to said second shaft within said body member, a collar rotatably mounted on the exterior of said body member, gear means connecting said collar and said gear, a second collar rotatable on said body member, means for locking said second collar against relative rotation to said first mentioned collar in any one of a plurality of rotatably adjusted positions, and means on said second collar engageable with means on the body member for controlling the permissible rotative movement of the collars relative to said body member.

13. In a grinding tool, the combination of a hollow mandrel, radially expansible abrading members mounted thereon, a device in the mandrel to expand said members, a driving shaft operatively connected to the mandrel, and means to drive said expanding device from the driving shaft of the tool, said means including a rotary casing and a connection between said casing and said driving shaft permitting rotation of said casing in one direction relative to the driving shaft and resisting rotation thereof in the opposite direction.

14. In a grinding tool, the combination with a hollow mandrel, a tube connected thereto, expansible shoes carried by the mandrel, shiftable cones in the mandrel, operative to expand the shoes, operating connections to said cones, including a rod within the tube, a driving shank connected to the tube, and a transmission gearing adapted to transmit rotative motion of the shank to said rod, said transmission gearing having a casing rotatably mounted on the shank and having a connection to the shank permitting rotation of the casing in one direction and resisting rotation thereof in the opposite direction, and said casing being adapted to be held against rotation to operate the gearing.

15. A grinding apparatus comprising a supporting body, a plurality of grinding members movably mounted on said body and capable of being expanded and contracted for enlarging or reducing the working diameter of said grinding members, a driving member connected with said body, and means for adjusting the working diameter of said grinding members comprising spreading elements arranged within the body and operating on said grinding members, controlling means mounted on said driving member and operable manually from the exterior of the apparatus independently of said driving member, said controlling means including a ring rotatably mounted with respect to said driving member and means connecting said ring and driving member and resisting rotation of said ring relative to said driving member in one direction, and motion transmitting means connecting said manually operable controlling means with said spreading elements.

16. A grinding apparatus comprising a supporting body, a plurality of grinding members movably mounted on said body and capable of being expanded and contracted for enlarging or reducing the working diameter of said grinding members, a driving member, a hollow shaft connected at its opposite ends with said body and said driving member, and means for adjusting the working diameter of said grinding members comprising spreading elements arranged within the body and operating on said grinding members, controlling means rotatably mounted on said driving member and operable manually from the exterior of the apparatus independently of said driving member, means resisting rotation of said controlling means in one direction, and motion transmitting means connecting said manually operable controlling means and said spreading elements including a rod arranged lengthwise within said hollow shaft.

17. An automatic cylinder grinder comprising a hollow body member, a series of grinding stones carried by the body member, a shaft extending into the hollow body member and adapted upon rotation in one direction to move the grinding stones radially from the body member and adapted upon rotation in the opposite direction to allow movement of the grinding stones inwardly towards the body member, a head connected to the body member to rotate the body member therewith, a sleeve rotatable on the head, a ring gear carried by the sleeve, an idler gear rotatably mounted in the head and meshing with the ring gear, a gear meshing with the idler gear and secured to said shaft, means permitting rotation of the sleeve in one direction and resisting rotation of the sleeve in the opposite direction on the head, means limiting rotation of the sleeve in either direction on the head, and manually oper able means for securing the sieve from rotation.

18. A grinding apparatus, comprising a supporting body, abrading members movably mounted on said body, abrading member positioning means for moving said members on said body toward and from the surface to be abraded, a driving member, a power transmitting member having a flexible connection at one end with said body and a driving connection at its opposite end with said driving member, manual adjusting means; and transmitting means operatively connecting said manual adjusting means and said abrading member positioning means.

19. A grinding apparatus, comprising a supporting body, expansible abrading members mounted on said body, means for expanding said members, a driving member, a hollow power transmitting member forming a flexible connection between said driving member and said body,

1 an adjusting member arranged externally of said driving member; and adjustment transmitting --means operatively connecting said adjusting member and said expanding means and having a part' extending through said hollow power transmitting member.

20. A grinding apparatus comprising a supporting body, expansible abrading members mounted in said body, means for expanding said members, a driving member, a hollow power transmitting member forming a universal connection between said driving member and said body, a spindle extending into the hollow power transmitting member and operatively connected to said expanding means, an adjusting member arranged externally of said driving member; and means connecting said adjusting member and said spindle.

21. In a cylinder hone driving and adjusting mechanism, a drive member, an adjusting member, a stop secured to said adjusting member and normally causing it to rotate with the drive member, means for fixing the adjustment of said stop circumferentially to permit a partial independent rotation of the drive member before the other member begins to rotate; and means operable by saidindependent rotation to expand the hone.

22. In a cylinder hone driving and adjusting mechanism, a drive member, a hollow shank driven thierebw, a spindle extending into the shank, means for connecting the drive member to the spindle to cause them to rotate together, means for selectively setting said connecting means to permit a predetermined partial initial rotation of the drive member before the spindle begins to rotate, and means operable by said partial initial rotation to expand the hone.

23. In a cylinder hone driving and adjusting mechanism, a hollow drive member, an internal adjusting member within said hollow drive member, said internal adjusting member being provided with an annular row of teeth and guided for rotation relative to said hollow drive member, a spindle secured to said internal adjusting member and extending through said hollow drive member, an external adjusting sleeve mounted on said hollow drive member and movable longitudinally and rotatably thereon, and coupling means connecting said sleeve and the teeth of said internal adjusting member whereby said sleeve may be selectively set to permit a predetermined partial rotation of the drive member without driving said spindle.

24. In a cylinder hone driving and adjusting mechanism, a hollow drive member, an internal adjusting disk within said hollow drive member guided for rotation relative thereto, said disk having an annular row of teeth thereon, a spindle secured to said disk and extending through said hollow drive member, hand-controlled adjusting means having a part thereof arranged externally of said drive member, and intermediate adjustment transmitting means operatively connecting said hand-operated adjusting means and the teeth of said disk and adapted to be selectively set by said adjusting means to per- .mit a predetermined partial rotation of the drive member relative to the spindle to expand the hone.

25. The combination with a cylinder hone having adjustable stone carriers and a drive member operatively connected with the hone, of an adjusting member coaxial with the drive member, a

stop for normally preventing relative rotational movement of one of said members with respect to the other, means for effecting the adjustment of said stop circumferentially through a predetermined arc to permit a relative rotational movement of the members through such arc, and means actuated by such relative rotational movement to adjust said carriers.

26. A control head for a grinding tool or like object comprising in combination, a body member, a shaft secured to said body member for driving movement therefrom, a second shaft, a collar rotatably mounted on said body member, gearing connecting said collar and said second shaft, and means for limiting the rotation of said collar relative to said body member.

27. A cylinder grinder comprising a body member, radially expansible abrading elements mounted thereon, means for expanding said elements, a driving shaft for rotating said body member, a second shaft for operating said expanding means, a collar rotatably mounted relative to said driving shaft, gearing connecting said collar and said second shaft, and means for limiting the rotation of said collar relative to said driving shaft.

28. In a grinding tool, the combination with a hollow mandrel, radially expansible abrading members mounted thereon, a device in the mandrel to expand said members, a driving shaft operatively connected to the mandrel, and means to drive said expanding device from the shaft, said means including a rotary casing, a planetary gearing between the casing and the expanding device, and means to hold the casing against rotation when desired whereby to drive the gearing and the expanding device.

29. In a grinding tool, the combination oi a hollow mandrel, a tube connected thereto, expansible shoes carried. by the mandrel, shiftable cones in the mandrel operative to expand the shoes, operating connections to said cones, including a rod within the tube, a driving shank connected to the tube, and a transmission gearing adapted to transmit rotative motion of the shank to said rod.

30. In a grinding tool, the combination of a hollow mandrel, a tube connected thereto, exe pansible shoes carried by the mandrel, shiitable cones in the mandrel, operative to expand the shoes, operating connections to said cones, including a rod within the tube, a driving shank connected to the tube, and a transmission gearing' adapted to transmit rotative motion of the shank to said rod, said transmission gearing be= ing 'of the planetary type and having a casing which may be held against rotation to operate the gearing when desired.

31. A grinding device comprising a head, radially movable stone holders on said head, means associated with said head for controlling the radial position of said stone holders with respect thereto, a drive member associated with said head and connected thereto by a joint permitting eccentricity of their respective axes, adjusting means for said controlling means on said drive member, and a connection between said adjusting means and said controlling means.

32. In cylinder grinding mechanism, abrading means, a member for driving said abrading means, and means for adjusting said abrading means including a device rotatable relative to said drive member, and an adjustable adjustment-limiting member associated with said device, a clutch. between said latter member and said drive member for rendering the same rotatable with and relative to said drive member, a part projecting from said device and a part projccting from said limiting member, said two parts being engageable when said limiting member and said drive member are clutched together to limit the extent of movement of said device relative to said drive member to limit the extent of adjustment of said abrading means.

33. In a cylinder grinding tool, a frame; stonecarriers carried by said frame; a tubular driving shaft connected to said frame; and means for adjusting said stone-carrier along said frame toward and from the cylinder wall including devices engaging said carriers for outward movement thereof, a sleeve rotatably mounted upon said shaft and having teeth on its inner surface, a gear eccentrically mounted within said shaft and having its toothed surface projecting through a slot in the adjacent surface of said shaft and engaging the teeth of said sleeve, and connections extending through said shaft and associated with both said gear and said devices whereby movement of said sleeve is imparted to said devices for outward and inward movement of said carriers.

34. In a cylinder grinding tool, the combination of a unit adapted to be rotated within the cylinder which includes stone-carriers adjustable toward and from the cylinder wall, a rotatable driving element, a tubular member between and connecting said unit and driving element for imparting rotary motion to said unit, said member having a slot at one side, and means for adjusting said stone-carrier including a gear eccentrically mounted in said member with its toothed periphery projecting through said slot, connections between said stone-carriers and said gear, and a rotatable device mounted upon said tubular member and having teethon its inner surface which engage the teeth of said gear projecting through said slot.

35. A cylinder grinder comprising a hollow body member, a series of grinding stones carried by the body member, a shaft extending into the hollow body member and adapted upon rotation in one direction to produce movement of the grinding stones radially outward from the body member and adapted upon rotation in the opposite direction to allow movement of the grinding stones inwardly toward the body member, a head connected to the body member to rotate therewith, the shaft of the body member extending into the head, a gear mounted on the end of the shaft within the head, an idler gear meshing with the said gear, a flhg gear meshing with the idler gear, a sleeve secured to the ring gear and rotatably mounted in relation to the head, an indexing member adjustable circumferentially of the said sleeve, a lug carried by the said indexing member, a stop stationarily secured to the head and adapted to be engaged by the said lug upon rotation of the sleeve in either direction on the head, and manually operable means for controlling rotation of the sleeve in relation to the head during rotation of the head.

36. In a cylinder grinder, a series of grinding stones arranged for expansion or contraction about a common axis to vary the grinding diameter of the stones, manually controllable means for moving the stones toward the work, and adjustable means determining the limit of movement of the stones by the manually controllable means.

37. A grinding apparatus, comprising a supporting body, a plurality of grinding members mounted on said body and movable thereon toward and from the surface to be ground, diameter adjusting means for enlarging or reducing the diameter of said grinding members, a driving member, an intermediate power transmitting member having a swivel connection at one end with said driving member, and a swivel connection at its opposite end with said body, manually controlled adjusting means mounted on said driving member, and intermediate adjustment means extending along said intermediate power transmitting member and operatively connected with said manually controlled adjusting means and said diameter adjusting means.

38. A grinding apparatus, comprising a supporting body, a plurality of grinding members mounted on said body and movable thereon toward and from the surface to be ground, diameter adjusting means for enlarging or reducing the diameter of said grinding members, a driving member, an intermediate hollow power transmitting member having a driving connection at one end with said driving member and a swivel connection at its opposite end with said body, hand controlled adjusting means having parts arranged externally of said driving member, and intermediate adjustment transmitting means operatively connecting said hand controlled adjusting means and said diameter adjusting means and having a part extending through said hollow transmitting member.

39. A grinding apparatus comprising a supporting body, a plurality of grinding members movably mounted on said body and capable of being expanded and contracted for enlarging or reducing the working diameter of said grinding members, a hollow shaft connected with said body by a universal joint, and means for adjusting the diameter of said grinding members comprising spreading elements arranged within the body and operating upon said grinding members for enlarging the diameter of the same, an adjusting rod arranged lengthwise in said hollow shaft and operatively connected at one end with said spreading elements, and a controlling ele ment arranged externally of the hollow shaft and operatively connected with the opposite end of said adjusting rod and adapted to be manipulated for effecting adjustment of said grinding members.

40. A grinding apparatus comprising a supporting body, a plurality of grinding members mounted on said body and movable thereon toward and from the surface to be ground, diameter adjusting means for enlarging or reducing the diameter of said grinding members, a driving member, intermediate hollow power transmitting means including a swivel having a driving connection with said driving member and said body, controlling means having parts arranged externally of said driving member; and intermediate transmitting means operatively connecting said controlling means and said diameter adjusting means and having a part extending through said hollow transmitting member.

MARSDEN.C. HU'I'IO.

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