US2022542A

US2022542A - Hydraulically operated grinding machine

Info

Publication number: US2022542A
Application number: US668428A
Authority: US
Inventors: Carl G Flygare; Wallace H Wood
Original assignee: Norton Co
Current assignee: Saint Gobain Abrasives Inc
Priority date: 1933-04-28
Filing date: 1933-04-28
Publication date: 1935-11-26
Anticipated expiration: 1952-11-26

Description

NOV. 1935- (37 G. FLYGARE ET AL HYDRAULICALLY OPERATED GRINDING MACHINE Filed April 28, 1933 5 Sheets-Sheet l CARL G. FLYGARE WALLACE H. W000 5 c 0 Fl 0. .7 WITNESSES 1935- c. G. FLYGARE ET AL Z Y HYDRAULICALLY OPERATED GRINDING MACHINE Filed April 28, 1933 5 Sheets-Sheet 2 /.9/ amen MA CARL. G. FLYGARE W/T v I WALLACE H. W000 1935- c. e. FLYGARE ET AL 2,022,542

HYDRAULICALLY OPERATED GRINDING MACHINE Filed April 28, 1933 5 Sheets-Sheet 3 Elma/m4 CARL G. FLYGARE i WALLACE H W000 WITNESSES WWW 8% W Nov. 26, 1935. c. e. FLYGARE ET AL 72,022,542

HYDRAULICALLY OPERATED GRINDING MACHINE Filed April 28, 1933 5 Sheets-Sheet 5 3 'CARL G. FLYGARE 'WALLAcE H. W000 W/TNE-SJEG Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE HYDRAULIGALLY OPERATED GRINDING MACHINE Application April 28, 1933, Serial No. 668,428

' :1 Claims. (01. 51-92) This invention relates to a for moving the slide of a grinding machine, and more particularly to a grinding wheel feeding mechanism for a hydraulically driven surface grinding machine.

Heretofore, in grinding machines of the type in which the work table reciprocates longitudinally of the base and the grinding wheel is mounted on a slide movable transversely relative to the longitudinal movement of the table, the transverse feedingmovement is obtained by a manually operable feeding mechanism whereby the operator, at the end of the table stroke, may move the wheel transversely so that on the next pass of the work by the wheel, the wheel will grind a fresh path on the surface of the work. Power actuated mechanism, such as a pawl and ratchet mechanism, has been devised for moving the grinding wheel slide transversely, either for a continuous movement or in timed relation with the work table reciprocation. The power actuated feeding mechanisms heretofore provided of the pawl and ratchet type, which are either actuated mechanically, electrically or hydraulically, have been so constructed and arranged that the transverse movement of the wheel at each actuation of the feeding mechanism moves the wheel only a fraction of the wheel width, thereby reducing the eillciency of the machine. To obtain the maximum efliciency of the grinding wheel, it is essential that the wheel be traversed by an amount substantially equal to the width of the wheel so that the operative face of the wheel engages and grinds a different portion of the work at each reciprocation of the work table past the grinding wheel.

The primary object of this invention is to provide a grinding machine having a movable slide with a fluid pressure system for moving the same which includes a metering valve arranged to force a measured amount of fluid through said system to move the slide through a predetermined distance.

It is a further object of this invention to provide a suitable transverse feeding movement for the grinding lwheel for traversing the grinding wheel by an amount substantially equal to its width at either or both ends of the work table stroke.

It is another object of this invention to provide a suitable hydraulic mechanism for feeding the grinding wheel slide transversely directly by fluid under pressure. Y a

It is still another object of this invention to provide a suitable hydraulic mechanism including a metering valve whichis adjustably controlled to cause a predetermined transverse feeding movement of the grinding wheel at either or both ends of the table stroke. 1 g

It is a further object of this invention to provide a suitable transverse feeding'movement for the grinding wheel slide which enables the slide to be traversed, at either or both ends of the table reciprocation, by an amount up to and equal to the full width of the grinding wheel, at a very slow continuous traverse for truing the grinding wheel, or to permit a manual control of the transverse movement in setting up the machine..

Other objects will be apparent from the following disclosure. One embodiment of this invention has been illustrated in the accompanying drawings, in which like reference numerals indicate like parts:

Fig. 1 is a front elevation of a..hydraulically operated surface grinding machine embodying this invention;

Fig. 2 is a combined fragmentary sectional and diagrammatic view, showing the piping arrangement for the fluid pressure system;

Fig. 3 is a cross-sectional view, on an enlarged scale, taken approximately on the line 3-4 of Fig. 1;

Fig. 4 is a fragmentary front elevation of the control lever shown in Fig. 3, with part of the casing broken away and shown in section;

Fig. 5 is a similar fragmentary view showing the control lever in a different position and showing the valves in section, to more clearly show the operative construction;

Fig. 6 is a fragmentary view similar to Fig. 5 showing the lever and valve in a difierent position;

Fig. 7 is a fragmentary cross-section of the reversing valve, taken approximately on the line l--l of Fig. 3;

Fig. 8 is a sectional view, taken approximately on the line 8-8 of Fig. 1, showing the transverse feeding movement in section and the remainder of the wheel slide and support in side elevation;

Fig. 9 is a fragmentary front elevation, on an enlarged scale, of the wheel slide and the transverse feeding mechanism;

Fig. 10 is a horizontal sectional view, taken approximately on the line Ill-Ill of Fig. 8, showing the wheel traverse reversing valve;

Fig. 11 is a fragmentary detail view, on an enlarged scale, of the actuating mechanism for the transverse feed reversing valve;

Fig. 12 is a fragmentary vertical section through the wheel slide traverse control valve. taken approximately on the line lI-Il of Fig. 8;

Fig. 13 is a fragmentary sectional view through part of the actuating mechanism for the traverse reversing valve. taken approximately on the line |3--ll of Fig. 10; and

Fig. 14 is a fragmentary horizontal section, taken approximately on the line "-44 of Fig. 13.

In accordance with this invention, a grinding machine is provided, in which a work table or a grinding wheel slide is moved by a suitable fluid pressure system including a fluid motor and a metering valve ,which is arranged to force a measured amount of fluid to the motor to move the table or slide through a predetermined distance. The invention may be employed to move a work table or a wheel slide longitudinally to a deflnite grinding station, or to move either a work table or a wheel slide transversely towards or from the other to feedthe wheel towards the work to a definite position.

The speciflc embodiment of the invention illustrated in the drawings relates to a surface grinding machine having a work table arranged for reciprocation beneath the peripheral face of the grinding wheel by a fluid pressure mechanism. The grinding wheel there shown is mounted on a transversely movable wheel slide which is supported on a vertically movable slide arranged for adjustment in a vertical direction to permit grinding the work to the desired thickness. A wheel feeding mechanism is provided to traverse the grinding wheel transversely, either by a manually operable hand wheel mechanism for use in manually adjusting the wheel during grinding and for setting up the machine or directly by a fluid pressure mechanism. The latter is so arranged that the wheel may be moved at a slow continuous rate for passing the grinding wheel across the face of a diamond or truing tool or intermittently at the end of the work table stroke by an amount up to substantially the width of the grinding wheel so as to present the operative face of the grinding wheel to a new portion of the work at each pass of the work beneath the wheel. The fluid pressure actuating mechanism comprises a metering valve which is preferably actuated by fluid under pressure and controlled in timed relation with the work table reversing mechanism to force a predetermined amount of fluid through the system to the fluid pressure actuator on the vertical slide so as to traverse the grinding wheeltransversely through the desired distance. This mechanism is so arranged that the grinding wheel may be traversed through a predetermined distance, at either or both ends of the table reciprocation, up to and substantially equal to the width of the grinding wheel. A suitable, readily accessible controlling device is provided which enables the mechanism to be manually adjusted so as to traverse the grinding wheel manually across the face of the work or by manipulation of a control knob arranged for a slow, uniform hand traverse of the grinding wheel for truing the wheel, or an intermittent feed at the end of the table stroke.

The surface grinding machine, as shown, is provided with a base 20 having a longitudinally movable work table II supported on a flat way '2 and V-way 23 on the base. A grinding wheel 25 is rotatably mounted on a transversely movable wheel slide 28 which is supported on a vertically movable slide 21 carried by an upwardly extending portion 28 of the base 20. The vertical slide I! is arranged for manual adjustment to position the periphery of the grinding wheel relative to the undue of the work piece which is mounted onthetablerl soastogrindthesurfacetothe required extent. This mechanism may comprise a a manually operable feed wheel I. which is preferably of a type similar to the well-known feeding mechanism, such as shown in the prior'patent to Table reciprocating mechanism The table II is arranged so that it may be reciprocated by a suitable power operated mechago nism to carry the work beneath the operative face of the grinding wheel. In the preferred form, the reciprocating mechanism comprises a fluid pressure system including a cylinder II mounted in the base ill. A piston 36 is slidably 25 mounted within the cylinder 35 and is connected by a piston rod 31 to a depending bracket 38 on the under side of the table II. The base is provided with a fluid reservoir 40, from which fluid is pumped through a pipe ll, a pump 42, a pipe so 43, to a reversing valve 44. Fluid from the pipe 43 enters a chamber 45 in the rear portion of the reversing valve and passes through a central aperture 48 in a frusto-conical rotary reversing valve member 41. Fluid passing through the passage 85 46 in the reversing valve is admitted through a port ll or a port 49 in the reversing valve casing 7 5|! through a passagell or a passage 52. Fluid admitted through the passage ll passes through a pipe 83 into a cylinder chamber 54 in the left- 40 hand of cylinder '5, as illustrated in Figs. 1 and 2. Fluid passing through the passage 52 enters a cylinder chamber ii at the right-hand end of the cylinder, as viewed in Figs. 1 and 2. In the position of the valve member 41, as illustrated in 4,5 Fig. 2, fluid under pressure is admitted through the passage ii, the pipe 53 and into the cylinder chamber 54 to move the piston 3t and the table II toward the right, as viewed in Figs. 1 and 2.

Reversing valve actuating mechanism The reversing valve member 41 may be actuated manually or by power. As illustrated in the drawings, a manually operable reversing lever 88 is pivotally mounted on a stud 59 which is flxed as to the base 20. A depending portion 60 of the lever 58 is provided with a gear segment 6 I. The gear segment 6| meshes with a gear segment 62 mounted on the outer end of a rock shaft 03. The inner end of the rock shaft 03 carries a gear segment 64 which in turn meshes with a gear 65 mounted on the valve stem 66 of the reversing valve member 41. It will be readily apparent from the foregoing disclosure that when the lever 58 is rocked on the stud I0, motion will be transmitted through the gear segments BI and 62, rock shaft 63, gear segment 64, to actuate the reversing valve 41. In order that the reversing valve 41 may be shifted rapidly into a reverse position after the lever has moved towards a central posi- 70 tion, a suitable load and flre mechanism is provided which includes a lever l8 pivoted on a stud 69 on the base 20. The upper end of the lever 68 is provided with a yoked portion II which strad-- dles a pin 1i mounted on the downwardly extending projection of the gear segment 94. A spring I9 is interposed between a stud II on the lower end of the lever 99 and a stud I9 which is fixedly mounted on the gear segment 94. It will be readily apparent from this disclosure that when thereversing valve is moved from one extreme position to the other, the swinging of the lever 99 to a central position increases the tension on the spring I4 until the stud ll passes a central line drawn between the center lines of the rock shaft 99 and the stud ll. At-this point, the released tension of the spring I4 serves to shift the reversing valve rapidly into a reverse position.

To prevent too rapid a motion of the reversing valve into its reversed position, it is desirable to provide a suitable mechanism to retard the motion of the reversing valve so as to give the desired action at reversal. In the preferred construction. this mechanism comprises a dash pot piston II which is slidably mounted in a dash pot cylinder I9. The dash pot piston is connected by a pin 19 with a lever 90 which is fixedly mounted on the rock shaft 93. The dash pot cylinder I9 is arranged with a passage II which permits by-passing of fluid from one end of the dash-pot cylinder to the other. As the reverse valve is moved from one extreme position to the other, the rotation of the rock shaft 93 rocks the lever 90 and slides the dash pot piston in one direction to cushion the motion of the reversing valve.

The lever 98 may be actuated manually or, in

the preferred form, may be actuated in timed relation with the table movement by dogs 94 and 95 which are adjustably supported by a T-slot 99 on the front of the table 2i. Assuming the table to be traveling in the direction of the arrow, as indicated in Fig. 2, the table continues moving in this direction until the dog 84 strokes a projection 91 on the reversing lever 59 and swings the reversing lever in a clockwise direction. This movement of lever 99 transmits a corresponding movement to the gear segments 9 I, 92, rock shaft 93, gear segment 64', gear 99, to rock the reversing valve member 41 also in a clockwise direction. During this movement, fluid under pressure passing through the passage 49 in the reversing valve is cut off from the passage BI and, after the lever 98 passes its central position, the released tension of the spring It moves the reversing valve rapidly intoa reverse position,admitting fluid under pressure through passage 52 into cylinder chamber 55 to start the table moving in a direction toward the left, as viewed in Figs. 1 and 2.

Similarly, the table continues motion in the direction toward the left (Figs. 1 and 2) until the dog 89 strikes the projection 91 and moves the reversing lever 59 in a counterclockwise direction to again reverse the flow of fluid to the table reciprocating cylinder.

While the fluid is being admitted through passage SI and pipe 93 to the cylinder chamber 54 to move the table toward the right (Fig. 2), fluid is being exhausted from the cylinder chamber 99 through passage 92, apassage 99 in the reverse valve and through a passage 9I. a throttle valve 92 and a pipe 93, into the reservoir 40. Similarly, when the valve is in the opposite reverse position, as illustrated in Fig. 9, fluid is exhausted from the cylinder chamber 94 through pipe 93, passage II, valve passage 90 and through the throttle valve 92, pipe 93, into the reservoir.

Throttle valve In order that the normal speed of the table may be varied to give the desired relative feed between the operative face of the grinding wheel and the work piece. a suitable throttle device is provided which preferably comprises the throttle valve 92 located in the exhaust side of the fluid pressure 5 system so that the speed of the table ii is regulated by the exhaust of fluid from the cylinder 99. The throttle valve 92 is preferably provided as an integral part of the reversing valve mechanism and is actuated by a manually operable 10 lever 94. By manipulation of the lever 94, the operator may vary the aperture of the throttle valve gbiznd thereby control the normal feed of the Traverse wheel feeding mechanism 15 In grinding of plane surfaces on a surface grinding machine of the type in which the table reciprocates beneath the wheel, it is desirable to provide a feeding mechanism to traverse the 20 grinding wheel transversely at the end of a table stroke so as to present the wheel face to a dinerent portion of the work on the next table stroke. In the preferred form, it is desirable to provide such a mechanism with a suitable power actuat- 25 ing device, which operates to automatically index or traverse the grinding wheel transversely at either or both ends of the table stroke. In the preferred form, as illustrated in the drawings, a fluid pressure cylinder 99 is mounted within the 30 vertically movable slide 21. A slidable piston 99 within the cylinder 99 is connected by a piston rod I00 to a bracket III which projects rearwardly from the wheel slide 29. A reversing valve I02 is provided to permit changing the direction of 3 movement of the slide. The valve I02 is of the balanced piston type. in which fluid conveyed from a source of fluid pressure enters through a pipe I03 into a valve chamber I04 between two valve pistons. As illustrated diagrammatically in 0 Fig. 2, fluid under pressure passing through pipe I09 and into valve chamber I04 passes through a passage I09 into a cylinder chamber I09 so as to cause a movement of the piston 99, the wheel slide 26 and the grinding wheel 25 toward the left, as 45 viewed in Fig. 2. During the movement of the piston 99 toward the left, fluid is exhausted from a cylinder chamber I09 through a passage I09, a valve chamber H9, and then through an ex-- haust pipe III into the reservoir 40 in .the base 50 of the machine.

The reversing valve I02 may be moved manually by means of a knob I I3 mounted on the outer end of a valve stem H4; or, if desirable, an automatically actuated reversing mechanism may be 55 provided for shifting the reversing valve when the wheel slide has been moved through a predetermined distance in either direction. In the preferred construction, such a mechanism preferably comprises adjustable dogs II9 which are 60 mounted on a member I I1 flxed to the wheel slide 29. The dogs I I9 are arranged to engage a lever I I9, which is flxed at the lower end of a rock shaft H9. The rock shaft I I 9 carries an arm I20 having a roller III engaging a spring-pressed plunger I22. The upper end of the rock shaft I I9 carries an arm I89 having a pin I3I riding in a groove I32 in the valve I02. It will be readily seen, as illustrated in Fig. 10, that the slide 29 carrying the adjustable dogs II9 moves toward the right, as viewed in Fig. 10, until the dogs I I9 engage the arm Ill and rock the roller I2I by the springpressed plunger I22, thereby moving the reversing valve I02 into a reversed position to change the direction of transverse movement or the grinding wheel and its supporting slide 26.

Hand traverse mechanism For certain types of grinding, it may be desirable to provide a suitable manually operable means to traverse the wheel transversely as desired. As illustrated in the drawings, this mechanism may comprise a hand wheel I35 mounted on a shaft I36, which carries a bevel gear I31 meshing with a bevel gear I38 on a shaft I38. The shaft I39 carries a pinion I40 which meshes with a rack I on the wheel slide 26. It will be readily apparent from the foregoingv disclosure that the rotation of the hand wheel I35 will operate through the bevel gears, pinion, and rack to traverse the wheel slide transversely as desired.

In order that the hand wheel may be stationary during the power traverse of the wheel slide, a suitable spring-actuated clutch member I42 is provided on the inner end of the hand wheel I35. The clutch member I42 cooperates with a corresponding clutch member I43 which is connected to rotate with the shaft I36. The hand wheel I35 and clutch member I42 are freely rotatable on the shaft I36. A spring I44 is provided to hold the hand wheel is an inoperative position with the clutch members disengaged during the power operation. If it is desired to operate the wheel traverse by hand, the hand wheel I35 is pushed. inwardly against the tension of the spring I44 to engage the clutch members I42 and I43. Rotation of the wheel I35 then transmits a transverse traversing movement to the grinding wheel slide.

During the hand traverse or a slow continuous traverse of the wheel for truing, it is desirable that the dog actuated reversing mechanism be made inoperative. This is preferably accomplished by providing a suitable means for rendering ineffective the adjustable dogs II6. in the preferred construction, the reversing arm or lever I It is preferably pivotally mounted on a stud I41 on a bracket I48 carried by the rock shaft II9. The lever H8 is normally held by a. spring I49 so that a pin I50 is in the normal path of the dogs II6. In order that the reversing lever II8 may be moved to an inoperative position, a cam I52 is provided on the stem II4 or" the valve I02. The cam I52 is arranged to engage the follower pin I 3i which is mounted on the end of a pivoted lever I30. The other end of the lever I engages the upper end of a rod I55 which is slidably mounted within the rock shaft IE9. The lower end of rod I55 engages a projection of the reversing lever IIB. By rotation of the knob II3, the rod I I4 and the cam I52 are rotated into the position as illustrated in Fig. 11 to rock the reversing lever H8 and to raise the pin I50 out of the path of the reversing dogs II6. In this position of the parts, the wheel slide may be traversed to its maximum extent, either manually or by power.

During the hand traverse of the wheel slide, it is desirable to provide a suitable means for bypassing fluid from one end of the cylinder 98 to the other so as to enable the slide .to be traversed readily. As illustrated, such a device may comprise a pin I56 fixed in the valve case which serves as a follower and engages a. cam groove I51 in valve I02 (Figs. 2, l3 and 14). When the knob H3 is turned to the hand position, rotation of valve I02 causes cam I51 to move relative to the fixed follower pin I56. This movement continues until the portion I53 of the cam I61 engages the pin I56 and slides the valve I02 to a neutral position, permitting by'pass of fluid between cylinder chambers I06 and Ill.

Metering valve for actuating power traverse The fluid under pressure for actuating the pis- 5 ton 80 totraverse the grinding wheel slide 26 relative to the work may be from any source or fluid pressure, but in the preferred construction, a suitable mechanism is provided so that the wheel slide may be accurately advanced through a pre- 10 determined extent at each or either reversal of the work table. In the preierred construction, this mechanism comprises a metering valve I60 which is arranged to iorce a predetermined volume of fluid into the cylinder 90 so as to cause 15 the wheel slide to move a predetermined distance at each actuation of the metering valve. The pipe I03 is connected through a valve IN and a pipe I62 to a chamber I63 in the metering valve I60. A spring I64 is provided to hold a'meterg ing valve piston I65 toward the left, as indicated in Fig. 2. The outer or left-hand position, as illustrated in Fig. 2, is determined by an adjustable screw I66 which permits adjustment of the capacity of the chamber I63 and thereby regug5 lates the amount of fluid forced into the cylinder 98 at each actuation of the piston I65 and also regulates the distance of the wheel movement.

A suitable means is provided after each actuation of the piston I65 to fill the metering 30 valve chamber I63 and pipe I03 so that at the next actuation of the valve, movement of the pision I65 is against a solid column of fluid. This mechanism may comprise a piston type control valve I68 which is actuated in timed relation with the work table reversing mechanism. As illustrated in Fig. 2, the gear segment 62 has a depending projection I69 which is connected by a link I10 with the valve piston I1 I A wheel slide traverse control valve is provided, which enables the wheel slide to be traversed at each or either end of the table stroke. This mechanism comprises a control valve I13 of the piston type having a valve stem I14 provided with valve pistons I15 and I16 which is connected by a pipe I11 and pipe I18 with the actuating chamber I19 in the metering valve I60. The valve I13 is connected by pipes I80 and I8I with the control valve I68. The pipe I18 is also connected with the valve I68.

Assuming the parts to be in the position as illustrated in Fig. 2, the work table continues moving toward the right until the dog 84 strikes the lever 58 and moves it in a clockwise direction. This movement of the lever 53 moves the gear segment 62 in a counterclockwise direction, and moves the valve I1I toward the right, as viewed in Fig. 2. This movement continues until the port at the end of pipe I82 is uncovered and fluid under pressure is admitted from the pump 42 through the pipe I82, the valve chamber I83 and pipe I18 into the metering valve chamber I19 to actuate the metering valve piston I65. The admission of fluid under pressure to the chamber I19 serves to force fluid in the meter- 55 ing valve chamber I63 and the column of fluid in the pipe I03 and force fluid into the cylinder chamber I06 to move the piston 99 and traverse the grinding wheel slide toward the left, as viewed in Fig. 2.

The metering valve piston moves towards the right until a projection I64 on the piston I 65 strikes a projection on the end of the valve chamber, which serves to limit the movement or the piston. By regulating the adjusting screw I88 the length of stroke of the'metering valve piston I89 may be regulated so as to force the desired amount of fluid through the system to move the piston 99 and the wheel slide 28 transversely through the desired extent. The valve piston I1I continues its movement toward the right, as viewed in Fig. 2, covering the port at the end or pipe I18 and shortly thereafter uncovering a port I 86 connected with pipe I 80, as shown in Fig. 5. The mechanism functions in a similar manner when-the table'II is moving in a direction toward the left, as viewed in Fig. 5.

Wheel slide traverse control valve I The wheel slide traverse control valve I18 is preferably so arranged that the grinding wheel slide 26 may be traversed transversely ateither or both ends of the table stroke. As illustrated in Fig. 2, the valve pistons I15 and I16 are positioned so as to allow passage of fluid through either pipe I80 or pipe I8I so as to advance or traverse the wheel slide at each end of the work table stroke. The valve stem I14 (Fig. 2) is held 'in a central position to permit traverse at both ends of the stroke by means of a spring-pressed plunger I90 which engages a notch I9I on the valve piston I15. If it is desired to traverse the grinding wheel slide only at one end of the table stroke, then the valve stem I14 may be moved so that the valve piston I15 covers the port at the end of the pipe I80 or so that the valve piston I16 covers the port at the end of the pipe I 8I. The covering of the ports at the end of either pipe I8I or I 80 serves to prevent fluid passing through one of the pipes so that during the actuation of the valve I68, fluid cannot be admitted through pipe I11 and-the closed pipes I80 or I8I to flll up the metering valve chamber I63 and the pipe I03. If the valve is adjusted into either of these positions and the chamber I63 is not filled, then at the next actuation of the metering valve, no motion is transmitted to traverse the wheel slide.

Slow traverse of the wheel for truing It is desirable that a suitable means be provided so that the grinding wheel slide may be traversed at a uniform but slow rate to carry the grinding wheel across a diamond or truing tool which may be mounted on the work table. To permit readily changing from a grinding condition in which the wheel slide is traversed rapidly and intermittently at the end of a table stroke to a slow but continuous traversing movement for truing, a valve I6I is provided which serves in the position illustrated in Fig. 2 to pass fluid from the metering valve chamber I63 through pipe I03 into the cylinder 98 to intermittently traverse the grinding wheel slide at either or both ends of the table stroke. The valve I6I is provided with a. port I92. A knob I93 is mounted on the outer end of the valve stem to facilitate adjustment of the valve I6I. When' it isdesired to true the grinding wheel, the knob I93 is rotated to bring the valve port I92 into alignment with a port I94 to admit fluid under pressure from the pipe I82 through a pipe'l95, the port I94, into the pipe I03. and admits fiud under pressure to move the piston 99 at a slow but uniform rate and traverse the grinding wheel acrossthe diamond or truing tool. The port I92 is preferably a V-port so that the aperture maybe varied so as to regulate the admistion of fluid through pipe I03 and thereby control the rate of traverse of the grinding wheel across the truing tool.

To facilitate adjustment of the valve IN, a

' scribed above.

of a plurality of grooves in the periphery of the valve stem I9I so that the valve may beturned quickly to any one of several predetermined positions so that the operator may readily-change v5 from a truing speed to a grinding traverse at the end of the table stroke. The valve I8I has three positions, hand traverse, traverse at the endo'! the table stroke, and a truing or slow continuous traverse. When the machine is set for hand 10 traverse of the grinding wheel, the valve III is turned to entirely out off fluid under pressure from the pipe I03. To facilitate positioning of the valve, a dial is provided associated with the knob I93 so that the valve may be readily turned 15 to any one of the three positions. In the hand position, as illustrated in Fig. 1, the valve I3I is turned so as to cut off fluid under pressure from the cylinder in the wheel head.

The operation of this machine will be readily g0 apparent from the foregoing disclosure. The work table 2| is reciprocated in the manner de- Assuming the valves to be adjusted into the position as illustrated in Fig. 2, the table travels in the direction of the arrow, as indicated in Fig. 2, until the dog 84 engages the reversing lever 68 and moves it in a. clockwise direction to cause a reversal of the valve 44 to change the direction of movement of the table. 'At the same time, the valve piston "I is moved 30 toward the right, as viewed in Fig. 2, so as to admit fluid from the pump 42 through pipe I82, valve chamber I83, pipe I18, into metering valve chamber I19 to actuate the metering valve piston I65, forcing fluid in the metering valve chamber, I63 through pipe I62, valve IBI, pipe I03, into valve chamber I04, through passage I05, into cylinder chamber I06, to move the piston 99 and the wheel slide 28 and grinding wheel 26 toward the left, as viewed in Fig. 2. It will be noted in Fig. 2, 40

which is a combined diagrammatic and constructional view, that the wheel head assembly is turned at right angles relative to the line of travel of the work table to facilitate illustration of the operation of the mechanism. The uncovering of 5 port I85 permits the fluid to exhaust from the valve chamber I19, due to the released tension of the spring I64 which in turn forces the fluid through the pipe I18, pipe I11, valve chamber I86, pipe I80, port I86, valve chamber I81, pipe 5 I88, into the metering valve chamber I63, and serves to flll up the chamber I83, pipe I03 and passage I06 and cylinder chamber I03 80 that the entire system is fllled with fluid and ready for the next actuation of the metering valve. As the 55 table 2| travels in the reverse direction, that is, toward the left, as viewed in Fig. 2, and continues in this direction until the dog 86 strikes the lever 58 (Fig. 5) so as to rock the lever 68 in a counterclockwise direction, this movement serves to move so the valve stem I1I toward the left, as viewed in Figs. 5 and 2. The first part of this movement cuts 0!! the port I85 so as to lock the column of fluid in the metering valve and its associated system, and at the same time'stops the flow of fluid 5 through the pipe I80 and allows the fluid under pressure passing through the pipe. I18 to be forced into the metering valve chamber I19 to actuate the metering valve piston I89 and cause a transverse-movement of the piston 99 and the 70 grinding wheel slide towardthe left, as viewed in Fig. 2. The intermittent traverse of the wheel slide in one'direction takes place at each end of the work table stroke until one of the dogs I I3 actuates therever'singlever I II to reverse the posi- 1s tion of the valve I02 so as to admit fluid into the chamber I08 and cause an intermittent traversing movement toward the right, as viewed in Fig. 2, at each end of the table stroke. As previously stated, by manipulation of the knob I 83 on the base and knob 3 on the wheel head, either a predetermined traverse may be obtained at one or both ends of the table stroke, a manual traverse, or a slow uniform traverse tor truing the grinding wheel.

The term fluid pressure piston and cylinder as used in the specification and claims is intended to cover broadly any suitable type of fluid pressure motor, either reciprocatory or rotary.

Having thus described the invention, what is claimed as new and desired to secure by Letters Patent is:

1. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one of said parts which is movable relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide, and a metering valve in said system which is operatively connected to force a measured amount of fluid to said cylinder to move the slide through a predetermined distance.

2. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one of said parts which is movable relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide, a metering valve in said system which is operatively connected to force a measured amount of fluid to said cylinder to move the slide through a predetermined distance, and means to adjust said metering valve so as to vary the distance the slide moves at each actuation of said valve.

3. A grinding machine of the type covered by claim 2 in which the metering valve comprises a cylinder and a movable piston arranged to force a definite amount of fiuid from the cylinder and the adjustable means is arranged to vary the extent of movement of the valve piston.

4. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one of said parts which is movable relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide, a reversing valve to change the direction of movement of said piston and slide, and a metering valve in said system which is operatively connected to force a measured amount of fluid to said cylinder to move the slide through a predetermined distance.

5. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one of said parts which is movable relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide, a metering valve in 'said system which is operatively connected to force a measured amount of fluid to said cylinder to move the slide through a predetermined distance, and fluid pressure means to actuate said metering valve.

6. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one of said parts which is movable relative to the base, a fluid pressure system including a piston and cyl inder operatively connected to traverse said slide, a metering valve in said system which is operatively connected to force a measured amount 0! fluid to said cylinder to move the slide through a predetermined distance, means to adjust the extent of movement or said metering valve so as to vary the distance the slide moves at each ac- 5 tuation of said valve, and fluid pressure means in said systemto actuate said metering valve.

7. A grinding machine comprising a base having a work support and a rotatable grinding wheel thereon, a traversable slide carrying one 10 of said parts relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide, a reversing valve to change the direction of movement oi said piston and slide, a metering valve in said 15 system which is operatively connected to force a measured amount of fluid to said cylinder to move the slide a predetermined distance, and a fluid pressure means in said system to actuate said metering valve. 20

8. A grinding machine comprising a base, a work support, a rotatable grinding wheel thereon,

a wheel slide to support said wheel for movement relative to the base, a fluid pressure system including a piston and cylinder operatively con- 25 nected to traverse said wheel slide relative to the base, and a metering valve operatively connected to force a measured amount of fluid to said cylinder to traverse said wheel through a predetermined distance. 30

9. A grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, means to reciprocate said table, a fluid pressure as piston and cylinder operatively connected to traverse said slide, and a metering valve actuated in timed relation with the table reciprocation andoperatively connected to force a measured quantity of fluid to said cylinder and cause a prede- 40 termined transverse movement of the wheel slide at the end of the table stroke.

10. A grinding machine comprising a base, a work supporting table thereon, a'rotatable grinding wheel, a wheel slide to support said wheel for 45 a transverse movement relative to the table, means to reciprocate said table, a fluid pressure piston and cylinder operatively connected totraverse said slide, and a metering valve actuated in timed relation with the table reciprocation and 50 operatively connected to force a measured quantity of fluid to said cylinder and cause a predetermined transverse movement of the wheel slide at either or both ends of the table stroke.

11. A grinding machine comprising a base, a 55 work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said 60 table, a reversing valve to change the direction of movement of said table, means including a piston and cylinder operatively connected to traverse said wheel slide, and a metering valve actuated in timed relation with said reversing valve 5 and operatively connected to force a measured quantity of fluid to said second cylinder and cause a predetermined transverse movement of the wheel slide at the end of the table stroke.

12. A grinding machine comprising a base, a 70 work support, a rotatable grinding wheel, a wheel slide to support said wheel for a movement rela-. tive to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said slide relative to the base, a me- 76 tering valve operatively connected to force a measured amount oi fluid to said cylinder to cause said movement of the grinding wheel, and means to adjust said metering valve to vary the amount oi. fluid which is forced into the cylinder so as to vary the amount of movement transmitted to the grinding wheel.

13. A grinding machine comprising a base, a work support, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the base, a fluid pressure system including a piston and cylinder operatively connected to traverse said wheelslide transversely relative to the base, a metering valve operatively connected to force a measured amount of fluid to said cylinder to cause a transverse movement of the grinding wheel, means to adjust the extent of movement of said metering valve to vary the amount of fluid and also the amount of transverse movement of the grinding wheel at each actuation of the metering valve, and fluid pressure means in said system to actuate the metering valve. l

14. A grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement oi the table, a second piston and cylinder operatively connected to traverse said wheel slide, and a metering valve actuated in timed relation with the reversing valve and operatively connected to force a measured quantity of fluid to said second cylinder and cause a predetermined transverse movement 01 the wheel slide relative to the table. v

15. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction oiflow of fluid under pressure to and from said cylinder so as to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, and a metering valve operatively connected to said second cylinder which is actuated in timed relation with the reversing valve and at an end of the table stroke to cause a predetermined flow oi fluidto said second cylinder to cause a predetermined transverse movement of the wheel slide relative to the table.

16. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for-a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve to change the direction or movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a metering valve operatively connected to force a measured quantity or fluid to said second cylinder which is actuated in timed relation with the reversing valve to cause a predetermined transverse movement of the wheel slide relative to the base, and fluid pressure means for actuating said metering valve.

1'7. A surtace grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of said table, adjustable dogs on said table to actuate said valve, a second piston and cylinder operatively connected to traverse said wheel slide, and a metering valve which is operatively connected to cause a predetermined transverse movement of the wheel slide relative to the table, and a valve operatively connected with the reversing valveto admit fluid to actuate the metering valve at each reversal of thetable so as to traverse the grinding wheel through a predetermined distance at each end of the table stroke.

18. A surface grinding machine comprising a base, a work supporting table thereon, a. rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of said table, adjustable dogs on said table to actuate said valve, a. second piston and cylinder operatively connected to traverse said wheel slide, and a metering valve which is operatively connected to cause a predetermined transverse movement of 'the wheel slide relative to the table, and means including a valve device operatively connected with the reversing valve to admit fluid to actuate the metering valve at each end or either end of the table stroke so as to cause a predetermined transverse movement of the grinding wheel either at each end of the table stroke or at either end of the table stroke.

19. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston .and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide transversely relative to the table, a metering valve which is actuated in timed relation with said reversing valve to admit a predetermined amount oi. fluid to said second cylinder to cause a transverse movement of the wheel slide relative to the table when the reversing valve is actuated at the end of the table stroke, and a control valve for said metering valve which is adjustable so that the metering valve may be actuated at either end of the table stroke.

. 0 20. A' surface grinding machine according to 7 wheel after it has moved transversely to a predetermined extent.

21. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel for movement toward and from the table,

a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a metering valve operatively connected to said second cylinder which is actuated in timed relation with the reverse valve to cause a predetermined transverse movement of the wheel slide relative to the table, and a throttle valve in said system arranged to direct fluid under pressure from the metering valve to intermittently traverse the wheel slide or to exclude fluid from the metering valve and pass it directly to the second cylinder to continuously traverse the wheel slide.

22. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to said wheel slide, a metering valve operatively connected to said second cylinder which is actuated in timed relation with the reversing valve to cause a predetermined transverse movement of the wheel slide relative to the table at each actuation of the reversing valve, and means to adjust the extent of movement of the metering valve so as to vary the transverse movement of the wheel slide at each reversal.

23. A surface grinding machine according to claim 2 in which a control valve is provided which is operatively connected with the metering valve and the fluid pressure line so that the metering valve may be operative to admit fluid at reversal to cause a transverse movement of the grinding wheel, or may be shifted into a second position to admit fluid under pressure through a v-port to cause a slow, uniform transverse movement of the grinding wheel relative to the work table for truing the grinding wheel, or may be shifted to a. third position in which the metering valve is entirely out out of the system to permit a transverse hand movement of the wheel slide.

24. A feeding mechanism for grinding machines comprising a base, a work support, a rotatable grinding wheel, a transversely movable slide therefor, a fluid pressure system including a piston and cylinder operatively connected to move said slide, a reversing valve to change the direction of movementof the piston and slide, means including adjustable dogs to actuate said reversing mechanism, a manually operable device arranged to render said dogs inoperative during the versely movable wheel slide thereon, a rotatable grinding wheel carried thereby. a fluid pressure system including a piston and cylinder operatively connected to move said slide, a reversing valve to change the direction of movement of said pis- 5 ton and slide, said valve beingarranged when in a neutral position to by-pass fiuid between opposite ends of said cylinder, means including adjustable dogs to actuate said reversing'valve, a manually operable mechanism to traverse said 10 slide, and a device to shift said valve to a neutral position so that fluid may by-pass from one end of the cylinder to the other during the manual traverse of the slide.

26. A feeding mechanism for grinding machines comprising a base, a work support, a transversely movable wheel slide thereon, a fluid pressure system including a piston and cylinder operatively connected to move said slide, a reversing valve to change the direction of movement of the 20 piston and slide, means including adjustable dogs to actuate said reversing valve, a manually operable mechanism to traverse said slide, a manually operable cam device to shift said valve to a neutral position so that fluid may be ivy-passed 25 i from one end of the cylinder to the other and to render said dogs inoperative during manual traverse of the slide.

27. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable 0 grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston 35 and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of said table, adjustable dogs on said table to control the actuation of said valve, a second piston and cylinder 0 operatively connected to traverse said wheel slide,

a metering valve which is operatively connected to cause a predetermined transverse movement of the wheel slide relative to the table, and a valve operable to admit fluid to actuate the me- 46 tering valve at each reversal of the table so as to traverse the grinding wheel through a predetermined distance at each end of the table stroke.

28. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable 50 grinding wheel, a wheel slide to support said wheel for a transverse movement-relative to the table, a vertically movable slide to support said wheel for movement toward and from the table,

a fluid pressure system including a piston and 55 cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a metering valve op- 60 eratively connected to said second cylinder which is actuated in timed relation with the reverse valve to cause a predetermined transverse movement of the wheel slide relative to the table, and

a throttle valve in said system arranged to direct fluid under pressure from the metering valve to intermittently traverse the wheel slide or to exclude fluid from the metering valve and pass it directly to the second cylinder to continuously traverse the wheel slide.

29. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relative to the table, a vertically movable slide to support said v wheel for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a metering valve operatively connected to said second cylinder which is actuated in timed relation with the reverse valve to cause a predetermined transverse movement of the wheel slide relative to the table, and a throttle valve in said system arranged to cause fluid to flow under pressure from the metering valve to intermittently traverse the wheel slide or to exclude fluid from the metering valve and pass it directly to the second cylinder to continuously traverse the wheel slide.

30. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said wheel for a transverse movement relatively to the table, a vertically movable slide to support said wheel slide for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a second valve operatively connected to said second cylinder which is actuated at the end of each movement of the table to cause a transverse movement of the wheel slide relatively to the table, and a third valve in said system arranged to direct fluid under pressure from said second valve to intermittently traverse the wheel slide or to exclude fluid from said second valve and pass it I directly to the second cylinder to continuously traverse the wheel slide.

31. A surface grinding machine comprising a base, a work supporting table thereon, a rotatable grinding wheel, a wheel slide to support said 10 wheel for a transverse movement relatively to the table, a vertically movable slide to support said wheel for movement toward and from the table, a fluid pressure system including a piston and cylinder operatively connected to reciprocate said 18 table, a reversing valve arranged to change the direction of movement of the table, a second piston and cylinder operatively connected to traverse said wheel slide, a second valve operatively connected to said second cylinder which is actuated at each end of the movement of the table to cause a transverse movement of the wheel slide relatively to the table, and a third valve in said system arranged to cause fluid to flow under pressure from said second valve to intermittently ll traverse the wheel slide or to exclude fluid from said second valve and pass it directly to the second cylinder to continuously traverse the wheel slide.

CARL G. FLYGARE. WALLACE H. WOOD.