US2235924A - Portable angular boring bar with grinder - Google Patents

Description

March 25, 1941. R. E. GIGNoux PORTABLE ANGULAR BORING BAR WITH GRINDER Filed April 2, 1940 3 Sl'leelzs-SheerI l March 25, 1941.

R. 4r;. GlGNoux PORTABLE ANGULAR BORING BAR WITH GRINDER Filed April 2, 1940 5 sheets-sheet 2 March 25, 1941. R. E. GIGNoUx PORTABLE ANGULAR BORING BAR WITH GRINDER s sheds-sheet 5 Filed April 2, 1940 Patented Mar. 25, 14941 PATENT @FICE PORTABLE ANGULAR BORING BAR, WITH GRIN DER

Ralph Ernest Gignoux, Bakersfield, Calif., assignor to Hopper Machine Works, Inc., Bakersfield, Calif., a corporation of California Application April 2, 194i), Serial No. 327,486

is claims.

The equipment of my invention has been especially designed to grind an internal taper in slush mud Dumps of a type used to pump the s'lushing mud in deep and oil well drilling. In these types of pump the removable valve seat fits on a slight tapered surface in the casting from part of the pump, there being a relatively large chamber above the valve seat and an opening in the casting in axial alignment with the seat. In the use of these pumps on account of the sand and other grit carried by the slushing mud, the cast metal black of the removable valve seat becomes eroded. It is hence necessary to grind the cast metal to obtain a true taper to receive a re- 1 placement valve seat. On account of the confined space it is a considerable problem to insert a rotary grinder and to manipulate this to grind the bearing surface for the valve seat. Certain of the problems involved in the provision of a construction by which the motor may be inserted through the opening in the casting into the space or cavity and to have a grinder attached to and operated by the motor with a suitable surface to grind the desired taper. Further, the axis of the grinder must be capable of a tilt to conform to the desired taper of the bearing surface, the grinder must revolve on its axis and also turn in a circle somewhat in a planetary type of motion to grind the full circle of the bearing. It further must have a longitudinal motion to complete the full length of the bearing surface and move radially outwardly as the grinding progresses to a greater depth in the metal of the pump. Other problems arise in that the tool must be portable to grind the bearings in the mud pumps without the necessity of dismantling the pumps and taking them to a shop to be set up for a larger and more readily manipulated grinding tool. Due to the different sizes of exterior openings in the pumps, the space or cavity adjacent the valve seat and the different sizes in diameter of these seats, it is necessary to provide one tool which may be accommodated to the considerable range of sizes in the pumps or other equipment to be ground.

Therefore an object and feature of my in vention involves a suitable stepped base which lits the opening in the casting ofthe pump, the steps properly seating themselves and to this base is secured an upper or secondary base having a cy lindrical outer bearing surface and a ring bearing surface connected therewith to accommodate the portion of the supporting mounting which is required to rotate in a circle. Rotatably mounted in the upper base I provide the cross feed sup- (Cl. Elf-245) port which has a circular bearing plate rotatable in the upper base on the angle bearings and by means of a ring gear attached to the upper part of the cross feed support and by use of a worm pinion mounted in a fixed position as to the base, the rotating part of the supporting equipment may be turned in a complete circle, the rotation being continued until the grinding work is completed.

A further feature of my invention is the employment of a cross feed bracket which is mounted for transverse sliding motion on the cross feed support. This bracket has an opening for passage of an arbor or grinding bar. To obtain the transverse motion a feed screw is utilized. In order to obtain the angular tilt of the grinding bar or arbor, I provide an arbor guide having an elongated sleeve preferably rectangular on the inside surface to accommodate a rectangular boring bar. This is tilted by means of a tilting plate pivoted transversely to the cross feed bracket. I also provide a clamp for the upper end of the boring bar with a screw feed connection to the supporting part of the structure by which the boring bar with the motor mounted on the inner end thereon and the grinder may be moved axially as to the opening in the pump and longitudinally of the surface to be ground.

My invention is illustrated in connection with the accompanying drawings, in which:

Fig. l is a vertical section substantially on the line I--l of Fig. 4 in the direction of the arrows, the boring bar and certain other central elements being illustrated in elevation.

Fig. 2 is a central vertical section of the collector ring assembly for the electric leads to the motor.

Fig. 3 is a vertical section of the upper part of the tool taken substantially on the line 3-3 of Fig. 4 in the direction of the arrows, part of the cross feed bracket and the assembly thereabove with the boring bar being shown in elevation and part of theV cross feed support shown partly in elevation.

Fig. 4 is a transverse section on the line ll-ll of Fig. 1 in the direction of the arrows.

Fig. 5 is a transverse section on the line 5 5 of Fig. 6 in the direction of the arrows illustrating the manner of taper grinding.

Fig. 6 is a side elevation taken in the direction of the arrow 6 of Fig. 3 or 4.

Fig. 7 is an elevation partly in section of a modified boring bar assembly having an air operated motor actuating the grinder.

Referring to the general type of construction of the mud pump with which this tool is designed to be operated and referring particularly to Fig. 6, a portion of a mud pump or other equipment is illustrated by the numeral II, this usually being of cast metal and having an opening I2 leading to the outside defined by the surface I3. Such opening is usually cylindrical. The taper bearing I4 is the surface on which the valve seat is mounted and it is along the surface I4 that erosion takes place where the sand or other grit works back and outside of the removable valve seat. This is the surface to be reground to form a suitable and tight t with a replacement transverse seat, There is a comparatively large cavity or space designated I5 above the bearing surface I4 and is used in my equipment to accommodate the motor.

Some of the stationary parts of the tool consisting of the supporting members include the stepped base 2l). This has a series of enlarged cylinders 2| with transverse annular shoulders 22 graduated in size, the shoulders being adapted to seat on the surface I3 of the casting and the short cylinders to form a somewhat close t with the opening I2. This base has a cylindrical inner surface 23 adjacent its lower end (note Fig. 1), an enlarging outwardly curved surface 24 thereabove and has an upstanding rim 25. The upper base member 88 has an inturned lower rim 3| screw threaded to the upstanding rim 25 and secured in a fixed position by a set screw or the like. There is an outward extending annular portion 3?. and the peripheral outer wall 33 extending upwardly. Conned inside of this upper base there is a flat bearing ring 34 fitting on the annular section 32 and a cylindrical bearing ring 35 fitted inside the outer wall 33. A flat cap ring 35 is secured to the wall 33 by screws or the like having a purpose hereunder defined.

Certain of the rotating elements include a substantial annular bearing plate 40. This is illustrated as rectangular in cross section and providing a relatively large internal opening somewhat greater in diameter than the opening inside of the lower rim 3i. This bearing plate is machined and has a thrust bearing surface operating on the at bearing ring 34 and a cylindrical peripheral surface operating against the cylindrical bearing 35. A ring 45 illustrated as substantially rectangular in cross section except for the shoulder iin 46 nts on top of the bearing plate 4I) and is secured thereto by a series of screws 41, these extending upwardly through the bearing plate having heads fitting in a countersink on the lowei1 surface of such bearing plate 4D. The ring l5 is utilized for the support and mounting of the ring gear 4l which seats on the upper side of the iin i8 and against th-e outer portion of the periphery of the ring 45 being secured in place by keys, set screws or the like.

The cross feed support assembly 50 includes a structure either formed integral with or attached to the ring e5, this consisting of two substantial bars 5I spaced apart and fitted across the interior circle formed by the vertical inside surface of the ring 85. Above these bars and preferably either welded or formed integral therewith there are guide bars 52, and strips 53 each of which has a guide seat 54 provided with a horizontal and a vertical surface, these being parallel. The bearing plate 55, it will be noted, is confined by the flat ring 38, this also having a close fit with the periphery of the ring 45 below the shoulder fin 45. This whole structure is designed to rotate by means of a worm drive hereunder described engaging the ring gear 41, thus the whole assembly including the bearing plate 40, the ring l5 and the transverse bars 5I and 52 may be rotated in a circle and this is usually under manual control.

In order to obtain a transverse movement, a cross feed bracket assembly B is utilized. This has a bottom plate BI shown as having marginal parallel guide strips 62 which have a bearing and fit on the shoulder guides 54 of the transverse bars 52. This plate has an oval shaped opening 63 with its long axis in the direction of the length of the plate and its short axis therefore being transverse to this plate 5I. A pair of bracket posts 64 extend upwardly from the bracket plate at one end and are provided with a pintle opening 65 at the bottom and a stop pin perforation 66 at the top through which is fitted the pintle B'I at the bottom and the stop pin 68 at the top. One end of the plate 6I is provided with a threaded radial opening 69 to receive the transverse feed screw 10. This screw is mounted and operated in th-e manner hereunder described, the action being that the rotation of the screw moves the complete assembly of the cross feed bracket transversely on the guide bars 52 and this transverse feed may take place while the assembly is rotating due to the rotation of the bearing plate 40 and the structures above described attached thereto.

The arbor guide assembly 88 includes a vertical plate 8l having its lower portion mounted on the pintle 61. This plate has a slot 82 at its upper portion formed concentric with the pintle 67 and through such slot extends the stop pin 68, thus limiting the tilting movement of the arbor guide plate. A substantial sleeve 85 is attached to the plate 8|. This sleeve has splits 85 at its lower and upper ends and is externally threaded, used for fitting the lower and upper grinder bar clamps 81. These clamps have suitable perforations or other devices providing a wrench grip, the threads being slightly tapered to squeeze the ends of the sleeve against the internal bearing sleeve 9|] and thus clamp the grinding bar 85. This grinding bar -extends completely through the sleeves 85 and 90 and is illustrated as hexagonal in cross section, the inside surface of the bearing sleeve 9Il of course being in similar cross section. This permits a longitudinal guided movement of the grinder bar or arbor .but prevents rotational movement.

In order to obtain the longitudinal movement of the grinder or arbor bar, a vertical motion feed clamp |00 is attached to the arbor adjacent the upper end. This extends to one side and has a vertically threaded opening to receive the vertical feed screw IIJI, such screw having a wrench grip at the top. The screw extends through a feed clamp |02 which is secured to the vertical plate 8| of the arbor assembly 83. Upper and lower collars ID3 are pinned to the lower portion of the screw, thus restraining vertical or permitting rotational motion and hence on rotation of the screw the clamp IIlll and hence the arbor or boring bar is raised or lowered.

A transverse screw I0 operates through a bracket assembly IIB, note Figs. 1 and 6, which is secured by screws to the ring 45. The screw operates with a clearance through the bracket but is confined by set collars III, thus giving a restraint to the screw so that the threading of the same in and out of the threaded opening E9 develops a transverse movement of the cross feed bracket assembly 60.

The ring gear'l is rotated by a worinv |.|5, note Figs. 1 and 4. This is mounted on a worm shaft IIB journalled in a pinion shaft bracket this latter being attached to the outside of the upper base 30 to the peripheral wall structure 33,- there being upwardly extending ears H8` confining the worm H5, thus as this worm shaft may be rotated in any suitable manner and is mounted on a stationary part of lthe machine, the cross feed support including the ring 45 and the bars 5| and 52 are rotated in acircle.

The motor mounting |20, note particularly Fig. 1, includes a cylindrical housing structure |2| provided with outer walls |22 and a base |23, this latter being secured to the lower end of the arbor bar 95. I'his is open at the end and permits insertion of the motor |25. The motor shaft |26 is preferably mounted to be in the axial `alignment with the arbor and has the grinding wheel |27 thereon. This wheel is illustrated of the type having a cylindrical grinding surface and of course this is concentric with the shaft |26 and hence with the axis of the boring bar.

In the construction illustrated the motor is indicated as of an electric type with the lead wires extending through the hollow center of the arbor. In order `to accommodate the rotary motion of the motor and grinding assembly, a ccllector ring construction indicated at |35 is connected to the upper end of the arbor, note particularly Fig. 2. This employs -a bottom cap |36 secured to a cylindrical upper section of the ar bor, a tube |3`| extending thereabove, a lower ,plate |38 secured to cap |36 and an upper plate |39 surrounding the pipe |31, the upwardly extending plate being downwardly pressed by a spring IM! reacting against a collar |4`| engaging a sleeve |42 secured to the upper end of the pipe |311. A pair of terminals |45 and |46 are each `connected to outer and inner annular rings |41 and |48. Brushes |49 and |50 each downwardly pressed by a spring |69 and housed in a bushing |6| bear on the lower outer and inner collector rings |62 and |63. The electric leads |64 and |35 are connected respectively to the outer and to the inner collector rings and lead through the hollow boring rod 95 to the electric motor. By this construction or any other suitable collector ring assembly the electric current may be car-- ried through the slowly rotating boring bar 95 which is rotated to follow the planetary motion developed in the internal grinding of the desired surface.

The assembled machine rests on the casting to the tapered ground as shown substantially in Fig. 6, the various steps in the base covering a range of diameters of the opening I2. In addition the clamps are commonly used to clamp the construction in position. By this `set up of the "tool it will be obvious that the grinder may be adjusted for the correct taper and when once adjusted and clamped the grinding wheel mounted on the motor shaft and reciprocated through the medium of the boring bar will al- Figs. 1 and 2 but of preferably larger sized internal bore. A nipple 2U2 isattached to the upper end and connected to this nipple there is a swivel assembly 205 of a known type with a compressed air supply pipe 206 attached thereto. The air motor 2||J is attached to the end of the boring bar and has a driving shaft 2|| actuating the grinder 2|2. As this equipment may be installed in the same supporting structure of the above described iigures, it will be seen that the machine is suitable for either electric or air actuated motor drive of the grinder.

Various changes may be made in. the details of the construction without departing from the spirit or scope of the invention as defined by the appended claims.

I claim:

1. In a device as described, the combination of a hollow supporting base adapted to fit on a pump at an opening therein, a bearing plate rotatably mounted on said hollow base, a cross feed support assembly mounted on said bearing plate, an arbor guide assembly having a tilting mounting on the cross feed support assembly, an arbor mounted in said guide assembly extending through the bearing plate and the hollow base, a motor attached to the lower end of the arbor and a rotatable grinder connected to and operated by the motor and means to feed the arbor in an axial direcicn.

2. In a device as described, the combination of a lower angular stepped base member adapted to seat on a pump or the like at an opening therein, an upper annular base member secured to the lower base member, an annular bearing plate rotatably mounted on the upper base member, a cross feed support assembly attached to the bearing plate, said support assembly having a pair of parallel and transverse lguide bars, a cross feed bracket slidably mounted on the said guide bars for transverse movement, a tilting arbor guide assembly mounted on said cross feed bracket, a boring bar slidably mounted in the arbor guide assembly, a motor having a grinding wheel connected to the lower part of said boring bar, means to rotate the annular bearing plate, means to transversely shift the cross feed bracket and means to adjust the boring bar axially of the arbor guide assembly.

3. In a device as described, the combination of a hollow base member adapted to seat on a pump or the like at an opening therein, an annular bearing plate rotatably mounted in the upper part of said` base and conned therein, a cross feed support assembly including a pair of parallel and transverse guide bars rigidly secured to the annular bearing plate to rotate therewith, a cross feed bracket assembly including a bottom plate and a pair of bracket posts, an arbor guide assembly including a vertical plate pivoted to the bracket posts with means to adjust the tilt of said vertical plate, the arbor guide assembly including a sleeve, a boring bar slidably mounted in the said latter sleeve and having a motor attached to the lower end of said bar with a rotatable grinding Wheel connected to and operated by the said motor, means to convey a power medium for the motor through the said boring bar, means to rotate the annular bearing plate, means to trans versely move the cross feed assembly bracket and means to longitudinally .feed boring bar through the arbor guide sleeve.

fl. In a device as described, the combination of a hollow base member adapted to on a pump' or the like at an opening therein, an annular bearing plate rotatably mounted in the upperpart of the base and conned therein, a cross -feed support assembly including a pair of parallel and transverse guide bars rigidly secured to the annular bearing plate to rotate therewith, a cross feed bracket assembly including a bottom plate and bracket posts, an arbor guide assembly including a vertical plate pivoted to the lower part of the bracket posts with an adjusting connection at the upper part of said posts, an arbor` guide sleeve secured to the vertical plate, a boring bar slidably mounted in such sleeve and having a motor attached to its lower end with a rotatable grinding wheel operatively connected to the motor, means to rotate the annular bearing plate, means to transversely move the cross feed assembly bracket and means to longitudinally feed the boring bar through the arbor guide sleeve.

5. In a device as described, the combination of a hollow base member adapted to seat on a pump or the like at an opening therein, an annular bearing plate with a cross feed support having upward. extending bracket posts, an arbor guide assembly including a vertical plate pivoted to the ybracket posts adjacent the lower portion thereof,

an adjusting means interconnecting the upper end of the plate and the upper end of the bracket posts, the arbor guide assembly having a sleeve attached to the pivoted plate, a boring bar eX- tending through the sleeve and having a motor connected to its lower end, a grinding wheel operatively connected to the motor, a clamp secured to the boring bar and an adjusting connection between said clamp and the arbor guide assembly to shift the boring bar longitudinally, means to rotate the annular bearing plate and means to transversely move the cross feed assembly bracket.

6. In a device as described, the combination of a hollow .base member adapted to seat on the pump or the like at an opening therein, an annular bearing plate rotatably mounted in the upper part of said base and confined therein, a cross feed support assembly including a pair of parallel and transverse guide bars rigidly connected to the annular bearing plate to rotate therewith, a cross feed bracket assembly, a guide arbor assembly pivotally connected to the cross feed bracket assembly, a sleeve included in the arbor guide assembly, a boring bar slidably mounted in said sleeve, a motor attached to the lower end of the bar, a grinding wheel operatively connected to the motor, means to rotate the annular bearing plate, means to transversely move the cross feed assembly bracket and means to longitudinally feed the boring bar through the arbor guide sleeve.

7. In a device as described, the combination of a hollow base member adapted to seat on a pump or the like at an opening therein, a bearing plate rotatably mounted in the upper part of the base and confined therein, a cross feed support assembly including a pair of parallel and transverse guide bars rigidly connected to the annular bearing plate to rotate therewith, the cross feed bracket assembly including a bottom plate slidably mounted on the said guide bars, an arbor guide assembly including a sleeve and having a pivotal connection to the cross feed bracket as- Sembly, a boring bar mounted in the sleeve, a motor connected to the lower end of the bar, a grinding wheel operatively connected to the motor, means to rotate the annular bearing plate, means to transversely move the cross feed assembly bracket and means to longitudinally feed the boring bar through the arbor guide sleeve.

8. In a device as described, the combination of a lower annular stepped base member adapted to seat on a pump or the like at an opening therein, an upper annular base member removably secured to the lower base member and having an annular bottom wall and a peripheral outer wall, an annular bearing plate rotatably mounted to fit inside said latter walls, a pair of parallel and transverse guide bars rigidly connected to the annular bearing plate, a cross feed bracket assembly slidably mounted on the guide bars, an arbor guide assembly including a sleeve pivotally connected to the said bracket assembly, a boring bar extending through the sleeve, a motor with a grinding wheel -operatively connected to the said bar, means reacting between the upper base member and the annular bearing plate to rotate said plate, means reacting between the cross feed bracket assembly and the annular bearing plate to shift said yassembly transversely and means operatively connected between the boring bar and the arbor guide assembly to shift the boring bar longitudinally.

9. In a device as described, the combination of a baseV ladapted to seat on a pump or the like at an opening, an arbor guide assembly having a sleeve, a boring bar extending therethrough with a motor and a grinder on one end of the bar, means to adjust the bar longitudinally as to the sleeve, a connecting structure between the arbor guide assembly and the base for rotational and radial movement of the said arbor guide assembly and means offset from the axis of the boring bar to tilt the sleeve of the arbor guide assembly relative to the axis of the work to be ground.

10. In a device as described, the combination of a base adapted to seat on a pump or the like at an opening for grinding a tapered surface located in the pump inside of said opening, an arbor guide assembly including a sleeve, a longitudinal plate attached to the sleeve at one side, a boring bar extending through the sleeve and having a motor with a grinder on the end of the bar below the said base, means interconnecting the arbor guide assembly and the boring bar to rectilineally Irl-ove said bar in relation to the sleeve, a bracket post, means forming a pivotal connection between the bracket post and the said plate adjacent the lower end of the plate oset from the axis of the boring bar. an adjusting means interconnecting the plate and the said post to adjust the tilt of the plate and hence the sleeve and boring bar, a movable mounting between the said base and the bracket post including means for rotational movement and means for radial movement of the boring bar in reference to the tapered surface to be ground.

11. In a device as described, the combination of a base ladapted to seat on a pump or the like ai? an Opening fOr grinding of a tapered surface aligned with such opening, a boring bar extending through the base and having a motor to be located between the opening of the pump and the surface to be ground, a grinding wheel operatively connected to the motor to operate on the surface to be ground, a movable supporting and interconnecting assembly between the base and the boring bar having provision for rotational movement of the boring bar, a radial movement thereof, a longitudinal movement of the boring bar in reference to the surface to be ground and means offset from the axis of the boring bar to tilt such bar.

12. In a device as described, the combination of a base adapted to seat on a pump or the like at an opening for grinding of a tapered surface aligned with such opening, a boring bar extending through the base and having -a motor to be located between the opening of the pump and the surface to be ground, a` grinding wheel operatively connected to the motor to operate on the surface to be ground, a movable supporting and interconnecting assembly between the base and the boring bar having provision for rotational movement of the boring bar, a radial movement thereof and a longitudinal movement of the boring bar in reference to the surface to be ground, the said boring bar having an electrical connection at the top and an electric motor with current conducting means extending through the boring bar.

13. In a device as described, the combination of a base adapted to seat on a pump or the like at an opening for grinding of a tapered surface aligned with such opening, a boring bar extending through the base and having a motor to be located between the opening of the pump and the surface to be ground, a grinding wheel operatively connected to the motor to operate on the surface to be ground, a movable supporting and interconnecting -assembly between the base and the boring bar, having provision for rotational movement of the boring bar, a radial movement thereof, a longitudinal movement of the boring bar in reference to the surface to be ground, and means offset from the axis of the boring bar to tilt such bar the boring bar having an opening therethrough, a compressed air connection at the top, a compressed air motor with a compressed airI connection to the hollow boring bar.

14. In a device as described, the combination of a base member adapted to seat on a pump or the like at an opening to position a grinder to operate on an internal tapered surface of the pump spaced from the opening, a boring bar extending through the base and having a motor with a grinding wheel operatively connected thereto, the .motor being adapted for location in 4the space between the opening of the pump and the tapered surface to the ground, a movable and adjusting assembly between the base and the boring bar to locate the boring bar axial as to the surface to be ground or at a tilt parallel to one side of the tapered surface, the assembly including means to move the boring bar rectilineally and means to rotate the boring bar in a circle relative to the surface to be ground and radially relative to the surface to be ground and means offset from the axis of the boring bar to tilt such bar.

l5. In a device as described, an annular lower base having means to center in an opening in a pump-like structure and to be supported by the pump and centered by the opening, an upper base having an internal annular bearing detachably connected to said lower base, a bearing ring assembly rotatably mounted on said annular bearing, a bar mounted on the said ring assembly and extending through the upper and lower base and into the opening, a motor and a grinder mounted on the bar, means on the ring assembly to tilt the bar relative to the axis of the opening to position the grinder with its grinding surface on a taper to be ground and means to rotate the said ring assembly and hence the bar with the motor in a circle to grind the desired tapered surface in a complete circle, means to advance the bar and hence the grinder longitudinally of the surface to be ground.

16. In a device as described, an annular lower base having means to center in an opening in a pump-like structure and to be supported by the pump and centered by the opening, an upper base having an internal annular bearing de- 4tachably connected to said lower base, a bearing plate rotatably mounted in said annular bearing, a ring gear attached to said bearing plate, a bar with a support mounted on said ring gear and extending into the opening, a motor and a grinder mounted on the bar, means on the bar support to tilt the bar relative to the axis of the opening to position the grinder with its grinding surface on a taper to be ground and means to rotate the said ring gear and hence the bar with the motor in a circle to grind the desired tapered surface in a complete circle, means mounted on the bar support to move the bar and hence the grinder in a radial direction as to the axis of the surface to be ground to grind to the desired depth and means mounted on the bar support to advance the bar and hence the grinder longitudinally of the surface to be ground.

lR. E. GIGNOUX.

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