US2353958A - Honing machine - Google Patents

Description

July 18, 1944. c. A. FULMER HONING MACHINE Filed May 4, 1942 INVENTOR. 1 fiar/e6 f7 //rfzer [SW/7% ATTYS Patented July 18, 1944 UNITED STATES PATENT `FFICE t Y t 2,353,958` I HONlN G MACHINE Charles A. Fulrner, Waukegan, Ill. l

Application May 4, 1942, Serial No. 441,581

1r claims. (c1. 51-34) The present invention relates to honing ma-f chines and is directed to improvements in the automatic mechanism for controlling the movements of honing tools for machines of this character. i y

Existing machines, which operate (en blind end cylinders for airplane motors; 'or thelilef by simultaneously rotating and vertically reciprocating their honing tools in contact with the work, are provided with control systems which x the lower limit of motion of the honing tool to a constant and iniiexible position which' is adjacent to the extreme lowermost point of honing tool travel. Machines of this type must therefore be equipped with an expensive elevating table so that blind end cylinders, or other work being operated on by the machine, must be moved upwardly to a position in which the honing tool at its lowermost position of travel will operate onY the lowermost surface within said work. This means of adjusting the work to the movement of the machine tool limits the use of the machine to a prescribed number of cylinder lengths and therefore renders said machine unadapted to certain types of motor cylinders. The present invention solves this problem by employing anni-1 versal honing machine which will operate on all sizes and types of cylinders thro-ugh mechanism for hydraulically adjusting the lowermost limit of honing tool travel to the particular work to be operated upon and by providing means for vary-` ing the lower limit of tool travel to any position within the maximum limits of motion of said reciprocating tool and by the cooperation of said means with the other novel features of the machine to be hereinafter more fully described.

Just before the fixed, lowermost limit ofA mo-V tion is reached by the tool on existing vertical machines, in its downward movement, a reciprocating machine part to which the tool is fas'- tened strikes the main frame of said machine with physical impact thus creating e, shock and a vibration in said machine, to the honing tool and to the work, which is detrimental to them and to the eiiicient operation of said machine.' While the hydraulic system is being automatically ccnditioned to reverse the directionv of travel'v of said tool from a downwardly direction to an upwardly one, the system continues. during this time, its tendency to move the honing tool in aY downwardly direction afterA said tool has been stopped by contact of the tool carrying part with the machine frame to thereby create a'honing tool dwell at the bottom of the reciprocating cycle of said tool. This dwell is necessary to pre-` vent taper of the cylindrical wall of a motor cylinder at its blind end because'the tool is prevented from traversing the area adjacent thereto as is well known ln-the art. A loss in machine efficiency results by physically stopping the tool before the hydraulic system has been conditioned to reverse the direction of movement of said tool. i

Furthermore, to obtain this honing tool delay before reversal of the movement of said tool, hydraulic reverse valves on conventionalmachines are provided with means for restricting the drainage ow of uid from one side ofvsaid valve when the machine has initiated unrestricted ow of fluid pressure to the other sideof said valve. The means used for restricting the ow of cil from the reverse valve to delay reversal ofthe honing tool and cause a dwell of said tool in the work, acts to direct drainage oil from said valve through any-one of a number of selective, re-

` temperature and its viscosity affects the rate of discharge through any selected orice with a consequent variation in the time period of delay or,l dwell of the tool at the bottom of the stroke. With devices of thisnature the time of honing tool dwell cannot be precisely controlled by the operators and there is little assurance that oncel the dwell period is determined upon and the machine adjusted thereto that said dwell period will'y remain constant.

It is therefore an object ofthe invention to provide a flexible honing machine for operating on blind end cylindersand the like, so that said machine will accommodate a wide rangek of cylinder lengths without adding to the initial cost' of said machine.

Another object of the invention is to provide a device for controlling the lower limit of motion and the time of honing tool dwell at said limit which may be attached to existing machines'of the genera] type illustrated herein which crisinally were not otherwise so equipped.

Another object of the invention is to provide a' taneously with the completion of said conditioning operation, to preclude, for a predetermined time, the introduction of pressure fluid to the hydraulic means whereupon said part is held in a pos-itive position at said limit of motion by a counterbalance valve automatically operated by the absence of pressure uid in the hydraulic means.

A further object of the invention is to provide an improved and simplified hydraulic system having incorporated therein the reversing means set forth in the foregoing object which provides increased production capacity and high operating speeds for honing machines.

A further object of the invention is to provide a honing machine which more accurately locates a tool at the lowermos-t position of travel, in relapressure to the cylinder may be of the type disclosed in my prior United States Patent No. 2,297,953, and may consist of a rack 2| fastened at its lower end to the coupling I and meshing with a gear 22. The gear 22 is adapted through suitable reduction gearing to rotate an oscillating control disk 23 which has stops thereon for engaging a lever 24. The lever 24 operates the pilot valve which controls the reverse valve 26 as will be more fully explained below.

The pressure supply means comprises a motor driven pump 21 which takes fluid from the sump tank 28 and introduces it under pressure through tion to the bore being honed, without impact or shock to the work or machine parts, and which is also eflicient and of simplied design.

Another object of the invention is to provide an automatic timing devicewhich will function to accurately retain a honing tool at its "dwell position over a denite predetermined time which is unaffected by temperature changes or or other physical limitations.

Another object of the invention is to provide an easily and quickly operated device for setting the machine for any class of work to be operated on, and which can be reset to the same conditions accurately at any future time.

A still further object of the invention is the provision of a device capable of changing the point of lowest travel to any place within the stroke capacity of the machine.

Other objects will be apparent from the following specincation and drawing which illustrates a preferred embodiment of my invention and in which:

Fig. 1 is a diagrammatical view of the hydraulic system and essential machineparts of my honing machine, various parts thereof being shown in cross-section and/or side elevation.

Fig. 2 is an enlarged, rear elevational view of the hydrostatic valve illustrated in Fig. 1.

Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 2.

The preferred embodiment of my invention comprises a machine frame 5 which carries at its upper end a housing 6 in which a vertically disposed tool carrying part 1 is journaled for rotation and reciprocation. The tool carrying part has a splined spindle 8 which isl constantly rotated through gears 9 by a motor (not shown). The lower end of said part is connected to an axially positioned tool head I0 by means of a universal joint II; said tool beingV illustrated as operating within the closed or ,blind end of acylinder I2 removably positioned on a base of the machine such as on the lower end of the frame 5. The upper end of the spindle is connected to a piston I3 by connecting rod. I6 which is fastened at its lower end to the spindle by a coupling i5 permitting rotation of the spindle relative to the connecting rod. The piston is reciprocated within a cylinder I6 to impart reciprocating motion to the tool carrying part by an hydraulic means which alternately introduces fluid under pressure into the cylinder through upper duct l1 and the lower duct I8 connected to pressure and exhausty lines I9 and 29 respectively, said lines communicating with the fluid pressure reversing valve and the pressure supply meansfor the machine.y

The mechanism associated with a moving part of the machine for controlling the hydraulic means which alternately introduces fluid under pressure supply line 29 to a hydrostatic control valve 3U which normally directs said pressure uid through line 3| to the reverse valve and to the lower duct I8 of the cylinder which, it will be noted, is connected to the side of the cylinder through which the connecting rod passes. The'actuation of the reverse valve 26 is accomplished in the usual manner through the pilot valve 25 which is connected to the pressure line 29 by a pipe 32, said pilot valve, upon oscillation through alternately and simultaneously making lines 33 and 34 pressure and drain lines for moving a piston 35 to the right or lefthand side of the reverse valve 26, respectively.

The pilot valve is operated by a means responsive to the movement of the tool-carryingl part which automatically reverses the part between predetermined limits prescribing its working cycle, said means comprising an oscillating disk 23 having a peripheral groove 3G in which are adjustably mounted an upper, manually rotatable limit stop 31 and a lower limit stop 38 which respectively determine the upper and lower limits of motion of the honing tool head during its working cycle within the cylinder I2. As illustrated by a broken line in Fig. 1, the pilot valve may have a direct drive connection with the lever 24 whichoperates the pilot valve. The reduction gearing drive connection between the gear 22 and the oscillating disk is such that the movement of the piston from its maximum upper limit of motion to its maximum downward limit of motion creates an oscillation of the disk which is less than one revolution, the working cycle of said tool head being controlled by the stops which are peripherally spaced apart on the disk at positions on said disk which determine the lower limits of motion of the tool head. The upper limit stop 31 engages a nger 39 on the pilot valve lever 24 to change the movement of the tool carriage from an upward to a downward direction while the lower limit stop.38 has an extension 4I) thereon for engaging the finger 4| on the lever 24 for changing the movement of the tool head from a downward to an upward direction within the cylinder being operated upon. The lower limit stop 38 has a cam portion 43 formed integral therewith and which is spaced a xed peripheral distancerfrom the extension 49 and engages electric switch 44 which actuates a valve means for stopping the tool at its lower limit of motion in the work.

In operation therefor, when the piston and the tool'carrying part are in their upper inoperative positions with the tool head withdrawn from the work, actuation of the hydraulic pump 21 will introduce fluid pressure through line 3l into the reverse valve 26 which at that time would have its piston 35 in the righthand side of the valve to permit introduction of said pressure fluid to lme I9 and into the upper duct of the cylinder is, thereby driving the piston downwardly. The

same iiuid pressure is also introduced into the line 720 and into the lower duct I8 of the cylinder I6, but the greater effective area on top of the piston I3, at which the pressure is introduced, will overcome the lesser pressure area beneath the piston I3, said area beneath the piston being occupied by the connecting rod I4. The piston. therefore, will move downwardly and force fluid from the lower end of the cylinder back through line 20 and into line I9 along with the pressure uid introduced to the reverse valve through line 3|. When the honing tool enters the cylinder to be operated on, the upper limit stop 31 is manually rotated into operative position (shown in Fig. 1) and the tool head continues downwardly in the work until the extension 40 on the lower limit stop actuates the pilot valve lever to reverse its motion by moving the piston 35 to the position shown in Fig. 1 of the drawing. In this position pressure fluid is introduced through line 3I to the lower side of .the cylinder while the line I 9 is made a drain line permitting draining fluid to enter exhaust line 42 and return to the sump tank 28. The hydraulic system is now conditioned to initiate its movement of the tool head in an upward direction. At the moment of reversal, however, a valve means, including the hydrostatic valve 38 interposed between the pressure supply lines Z9-3|, is operated by an actuating meansconsisting of the cam 43 which operates a switch 44 to render the pressure supply means inoperative and stop the reciprocation of the honing tool at its lower limit of motion Within the work, thereby creating 'a dwell. A selective time controlled means is also initiated by the actuating means to provide a dwell of a selected predetermined time. A spring loaded check valve 260 interposed in line 29 assures that a given pressure will be exerted at a point ahead of the hydrostatic valve 38 so that the reverse valve 26 can always operate even when the pressure is at zero in line 3 I.

The hydrostatic valve 39, as most clearly illustrated in Figs. 2 and 3, consists of a casing 45 provided with a passageway 46 which extends through the bottom portion thereof and is connected to the pressure supply line 3| at one side while the other side communicates with pressure line 29. A manually controlled rotary valve 111 is interposed in the passageway 46 and consists of a reduced semi-cylindrical part 48 extending across the said passageway 46 and which is adapted to open or close said passageway by manual rotation of a handle 49 connected to said valve by shaft 50. When the rotary valve is open the position of the semi-cylindrical portion relative to the passageway 46 determines the volume of pressure fluid admitted to the line 3l from the pump.

As most clearly shown in Fig. 3, a cylindrical chamber I is disposed above the rotary Valve which communicates at its forward end with the fluid pressure line 29 on the pump side of the rotary valve by means of a passageway 52 (Fig. 2) while the rear end of the chamber communicates with the pressure supply line 3| on the motor cylinder side of said rotary valve by a passageway 53. A movable valve member 54 is positioned within the chamber 5I intermediate the ends thereof so that pressure fluid may be introduced through said passageways 52 and 53 to opposed sides of said member which takes the form of a piston 55. Extending from said piston 55 into the forward end of the chamber is a valve head 56 which is adapted to Vopen and close an exhaust port 51 formed in the casing45`and which communicates with the pump side 29 of the pressure line through passageway 52, said exhaust port being connected to the sump tank 28 by line 58. The valve member is biased to close the port 51 by a spring 59 which encircles a' guide shaft 60 extending into a guide opening 6 I formed in the rear portion of the chamber.

As indicated in Fig. 3, a ball check valve 62 is interposed in a passageway 63 which connects the rear part of chamber 5I with the exhaust line 58, a spring 64 and set screw 65 being adapted to adjust the static pressures in both ends oi' the chamber 5I. This ball check valve permits the return of pressure iiuid back to the sump tank 28'when the machine is manually shut down by closing the rotary valve 41. When va1ve`41 is closed maximum pump capacity is introduced to the forward end of the chamber 5I through line 29 and passageway 52. This pump pressure exertedon the forward side of the piston 55 is greater than the combined pressures of the fluid in the cylinder end of the piston and the spring 59 exerted on the rear side of said piston and is also sufficient to unseat the ball check valve 62. The piston 55 is therefore moved to unseat the valve head 56 and fluid pressure from the pump is delivered to the sump tank A28 through line 58.

In normal operation, therefore, the rotary valve will be set to permit flow of pressure fluid' from the pump 21 through line 29 and into the pressure supply line 3| for the hydraulic system and said pressure fiuid will enter the vvchamber 5I and create static pressure on opposed sides ofy the piston 55 of the valve member, the spring 59 serving to bias said piston to close the exhaust port 51. A pressure release means 66 which takes the form of a solenoid valve controls the passage of pressure fluid from the rear portion of the cylinder through an exhaust line 61 connected to said chamber and the valve 66. As shown in Fig. l, the valve has a plunger 68 which is spring urged to closed position against the valve seat 69' which prevents fluid from exhausting through line 10 into exhaust line 42. The valve is opened by the actuation of a solenoid 1I which is connected to the plunger 68 by a shaft 12, said solenoid being actuated when the switch 44 is closed by camming of the dog 38 on the oscillating disk. When the solenoid valve is so operated, the uid pressure in the rear side of piston 55 is reduced to zero while they iluid pressure in the forward side of the chamber is the pressure in the pump side of the Aline 29 which moves said piston 55 against the bias of the spring 59 and permits all of the pressure fluid from the pump 21 to be re- Y turned to the tank through the port 51 and exhaust line 58. When the pressure release means is actuated by the switch 44, the honing tool has come to rest in its lowermost limit of motion within the work (Fig. 1) by the reversal of the hydraulic system from a downward to an upward tool carrying condition. At said instant of complete reversal tbe solenoid valve 66 is operated, thus returning all of the pressure fluid from the pump to the sump tank and thereby rendering the pressure' supply line 3| incapable of carrying pressure fluid. Line 20 also has a zero pressure in it and therefore a counterbalance valve 13 is interposed in said line between the reverse valve 26 and the lower duct of the cylinder I8 to hold the reciprocated weight stationary. This valve holds the reciprocated part of the machine stationary regardless of the position at which said parts come to restand consists of a passageway A'|4 exten'dingthrough said valve in which a plunger is Seated, said plunger having disk-like heads of unequal diameter. VThe upper head of the plunger has the greatest diameter so that pressure uid inline will unseat said plunger and allow fluid to enter the cylinder I6. The plunger is urged to seated position by aV spring 16 which can be adjustably compressed by threaded boss The pressure exerted by the spring is adjusted to be more than enough to retain fluid in the lower side of the cylinder when line 20 has zero pressure therein to sustain the reciprocated mass in a stationary position.

As shown in Fig. 1, the one side of the solenoid valve 66 is connected to the switch 44 by electric line '18 while the other side of said switch is connected to an electric power line 19 by line 8l). The other side of the solenoid valve is connected to va normally open switch 8| by a line 82, the

other side ofthe switch being connected to the power line 19 by line 83. i

It is also contemplated that the elapsed time during which the tool dwells in its lowermost limit of travel within the work can be selectively controlled and that this time of dwell may be preferably accomplished by means of a pneumatic timer 84 which is conditioned for operation by the closing of the switch 44 and which is adapted to break the connection between the switch 44 and the solenoid valve 66, after an elapsed period of time, by the opening of switch 8|. The pneumatic timer has a solenoidV 85 positioned on the casing and connected to the circuit leads 18 and 83 through switch 44 so that upon actuation of said switchthe solenoid will for an instant be actuated to draw up the armature 86, thereby moving upwardly the block 81 and ilexible diaphragm B8 against the bias of spring 89. This action closes the switch 8| and also exhausts air in the upper chamber 90 of the timer through a one-way valve 9|. After the actuation of the solenoid, the contact block and the diaphragm move downwardly at a rate dependent upon the amount of air permitted to enter saidchamber 9!) through needle valve 92 which is adjustably controlled by a threaded pin 93. The block, upon reaching its lowermost position indicated in Fig. 1, contacts an arm 94 which opens the switch 8|, thereby breaking the connection between the switch and the solenoid valve 66 and permitting said valve to move to closed position under the action of its biasing means. When said solenoid valve is closed, pressure is again built up in the rear end of the chamber of the hydrostatic valve which permits the piston 55 to move to the left (Fig. 3) under the bias of the spring 59 and close the port 51' to the exhaust. Pressure fluid is then permitted to move into the hydraulic system through supply line 3| thereby raising the honing tool within the work and continuing the working cycle of the machine.

What is claimed is:

l. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, a vertical cylinder disposed above the part in axial alignment therewith, a piston in the cylinder, a connecting rod for the piston and the part, an hydraulic reversing means actuated by the reciprocating part for changing the direction of movemento said part, an upper and a lower duct for the cylinder, an' hydraulic line connected to each duct and communicating with the reversing means, pressure supply means interposed in the line for the lower duct, said reversing means acting during upward movement of the part to drain fluid from the upper duct and to permit introduction of uid direct from the pressure supply means to the lower duct, and during downward movement of the part acting to introduce fluid under pressure to the upper duct from the lower duct and from the pressure supply means, valve means associated with the pressure supply means for rendering the last said means inoperative, actuating means operated by the part and having an operative connection with the valve means, a selective time controlled means associated with 'the actuating means for breaking the connection between the actuating means and the valve means after the elapse of a predetermined time, and a counterbalance valve in the line to the lower duct between the pressure supply means and said duct for preventing the draining of fluid from the lower end of the cylinder when the valve means renders the pressure supply means inoperative.

2. In a honing'machine the combination of a rotating and a vertically reciprocating tool carrying part, a cylinder, a piston in the cylinder, a connecting rod for the piston and the part, hydraulic means for alternately introducing fluid under pressure to opposite ends of the cylinder to reciprocate the piston and the part, a pressure supply line for the hydraulic means, valve means associated with the pressure supply line and comprising an exhaust port connected to the supply line, a movable valve member, means for biasing the valve member to close the port, means for introducing fluid pressure from the supply line to opposed sides of the member, and pressure release means communicating with one side of the member, actuating means operated by the part and having an operative connection with the pressure release means, and selective time controlled means associated with the actuating means for breaking the operative connection between the actuating means and the pressure release means after the lapse of a predetermined time. v

3. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, a vertical cylinder disposedabove the` part in axial alignment therewith, a piston in the cylinder, a connecting rod for the piston and the part, an hydraulic reversing means 'actuated by the reciprocating part for changing the direction of movement of said part, an upper and a lower duct for the cylinder, an hydraulic line,

connected to each duct and communicating with the reversing means, a pressure supply line interposed in the line for the lower duct, valve means associated with the pressure supply line and comprising an exhaust port connected to the supply line, a movable valve member, means for biasing the valve member to close the port, means for introducing uid pressure from the supply line to opposed sides of the member, and pressure release means communicating with one side of the member, actuating means operated by the part and having an operative connection with the 'pressure release means, and selective time controlled means associated with the actuating means for breaking the operative connection between the actuating means and the pressure reease means after the lapse of a predetermined 4. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, a vertical cylinder disposed above the part in axial alignmenttherewith, a piston in the cylinder, a connecting rod for the piston and the part, anhydraulic reversing vmeans actuated by the reciprocating part for changing the direction of-'movement of said part,an upper and a lower duct for the cylinder, an hydraulic line connect- `ed to each duct and communicating with the reversing means, a pressure supply line interposed in the line for the lower duct, valve means associated with the pressure supply line and comprising an-exhaust port connected to the supply line, a movable valve# member, means for biasing the valve member to close the port, means for introducing fluid pressure from the supply line to Yopposed sides of the member, and pressure release means communicating with one side of the member,"actuating means operated by the part and having an operative connection with the pressure release means,-selective time controlled means associated with the actuating means for breaking the operative connection between the actuating means and the pressure release vmeans after the lapse of a predetermined time, and a counterbalance valve in the line to the lower duct betweenthe pressure line connection and said duct for preventing the draining of fluid fromr the lower end of the cylinder when the valve means renders the pressure line inoperative. l

5. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, a` cylinder, a piston in the cylinder, a connecting rod forfthe piston and the part, an oscillating disk connected to the part, upper and lower limit stops on the disk, an hydraulic reversing means actuated by the stops for changing the direction of movement of said part dur-- ing its working cycle, an upper and lower duct for the cylinder, an hydraulic line connected to each duct and communicating with the reversing means, a pressure supply line connected toy the hydraulic line for the lower duct, valve means associated with the pressure supply line and comprising an exhaust port connected to the supply line, a movable valve member, means for biasing the valve member to close the port, means for introducing pressure fluid from the supply line to opposed sides. of `the member, an exhaust line communicating with one side of the member, a solenoid valve interposed in said exhaust line, an electric switch actuated by the stop controlling the lower limit of motion of the part and having an operative connection with the solenoid valve, and a selective time controlled means for breaking the operative connection between the switch and the solenoid valve after the lapse of a predetermined time.

6. In a honing machine the combination of a rotating and reciprocating tool carrying part, a motor for the part, hydraulic means for alternately introducing-pressure fluid Lvto opposite ends of the motor to reciprocate the part, a pressure supply line for the hydraulic means, valve means associated with the pressure supply line and cornprising a chamber, a piston positioned in they chamber intermediate its ends, passageways for each end of the chamber and each communicating with the pressure supply line, a volume control valve interposed in the pressure supply line between said passageways, an exhaust port in one end of the chamber, means for biasing the piston to close the port, a ball check valve between the chamber ends, pressure release means communicating with one side of the chamber, and actuating means operated by the part and hav- `ing an operative connectionwith the pressure remotor for the part, hydraulic means for alternatelyintroducing,pressureuid to opposite ends of the moto'rto reciprocate the part, a pressure -supply line for. the hydraulic means, valve'means associated with the pressure supply lineand comprising -a chamber, a pressure responsive device positioned the chamberintermediate its ends, means for introducing fluid pressure from the supply line to opposedsides of the device, a volume control valve interposed on the pressure supply line between the said means, an exhaust port'in one end of the chamber, means for biasing the device to close the port, a relief valve between the chamber ends, pressure release means communicating withoneside of the chamber, and actuating means operated'by the part fand having an operative connection with the pressure release means. c

8. In a honing machine the combination of a rotating and a vertically reciprocating tool-carrying part, a vertical cylinder disposed above the part, a piston in the cylinder, a connecting rod for the pistonand the part,hydraulic means for alternately introducing pressure fluid to the upper and the lower endof the cylinder to reciprocate the part, pressure supply means for the hydraulic means, means responsive to the movement of the part connected with the 'hydraulic means and adapted to control the upper and lower limits of motion of the part during its working cycle, valve means associated with the pressure supply means, actuating means operated by the means responsive to the movement of the part and making an operative connection with the valve means when said part is at its lower limit of -motion to render said supply means inoperative, a counterbalance valve communicating with the lower end of the cylinder for preventing the draining of fluid from said cylinder end when the valve means renders the pressure supplymeans inoperative and a time controlled means for breaking the connection between the actuating means and the valve means after the elapse of a-predetermined time.

9. In a lhoning machine the combination of a rotating and reciprocating tool-carrying part, a cylinder, a piston in the cylinder, a connecting rod for the piston and the part, pressure supply means for the hydraulic means, means responsive to the movement of the part -connected with the hydraulic means and adapted to control the limits of motion of the part during its working cycle, valve means associated with the pressure supply means, a solenoid for the valve means, a switch operated by the means responsive to the movement of the part and actuating the solenoid when said part isat a limit of motion during its working cycle to render said supply means inoperative, and a time controlled means conditioned for operation b-y the actuation of the switch and adapted to break the electrical connection between the switch and the solenoidafter the elapse of a predetermined time.

10. In a honing/machine the combination of a rotating and reciprocating tool-carrying part, a cylinder, a' piston in the cylindena connecting rod for the piston and the part, pressure supply means for the hydraulic means, means responsive to the movement of the part connected with the hydraulic means and adapted to control the limits of motion of the part during its working cycle, valve means associated with the pressure supply means and normally closed to permit the introduction of pressure fluid to the hydraulic means,

a solenoid for Opening the valve means to render said supply means inoperative, a selective time controlled means, a solenoid for initiating the operation of the time controlled means, a switch operated by the means responsive to the movement of the part ,and actuating the solenoids when said part is at a limit of motion during its working cycle, and a means actuated by the time controlled means after a predetermined time to break the electrical connection between the switch and the valve operating solenoid to return the valve to normal position.

11. In a honing machine the combination of a rotating and a reciprocating tool carrying part, an hydraulic motor connected to the part, hydraulic means for alternately introducing fluid `under pressure to opposite ends of the motor to reciprocate the part, a pump for normally supplying pressure fluid to the hydraulic means, valve means interposed between the pump and the hydraulic means for precluding introduction of pressure fluid to said hydraulic means, actuating means operated by the part and having an operative connection with the valve means, selective time controlled means associated with theactuating means for breaking the connection between the actuating means and the valve means after the elapse of a predetermined time, and means in the hydraulc means for Vprecluding draining or fluid from one end of the motor when said valve means is operative.

12. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, an hydraulic motor connected to the part, hydraulic means for alternately introducing fluid under pressure to opposite ends of the motor to reciprocate the part, a pump for normallysupplying pressure huid to the hydraulic means, valve means interposed between the pump and the hydraulic means for precluding introduction of pressure luid to said hydraulic means, actuating means operated by the part and having an operative connection with the valve means, selective time controlled means associated with the actuating means for breaking the connection between the actuating means and the valve means after the elapse of a predetermined time, and means in the hydraulic means for precluding draining of fluid from one end of the motor when said valve means is operative.

13. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, a cylinder, a piston in the cylinder, a connecting rod for the piston and the part, hy-

draulic means for alternately introducing lluid under pressure to opposite ends of the cylinder to reciprocate the piston and the part, pressure supply means` for the hydraulic means, valve means associated with the pressure supply means for rendering the last said means inoperative, actuating means operated by the part and having an operative connection with the valve means, means interposed in the hydraulic means to the lower end of the cylinder for precluding. draining of fluid therefrom when the valve means is operative, and selective time controlled means associated with the actuating means for breaking the.

connection between the actuating means and the valve means after the elapse of a predetermined time,

14. In a honing machine the combination of a rotating and a vertically reciprocating tool carrying part, an hydraulic motor connected to the part, an oscillating disk driven in timed relation with the part, upper and lower limit stops on the disk, an hydraulic reversing means actuated by the stops for changing the direction of movement of said part during its working cycle, an upper and lower duct for the motor, an hydraulic line connected to each duct and each communicating with the reversing means, a pump line connected to the reversing means for normally supplying fluid pressure to the hydraulic lines, valve means interposed in the pump line for precluding introduction of pressure fluid to the reversing means, a solenoid for operating the valve means, a switch actuated by the stop and controlling the lower limit of motion of the part and having an operas tive connection with the solenoid,'a selective time controlled means for breaking the operative connection between the switch and the solenoid after the elapse of a predetermined time and a counterbalance valve interposed in the hydraulic line to the lower end of the motor for precluding the draining of fluid therefrom when the valve means is operative.

15. A honing machine as claimed in claim 14 wherein the upper and lower limit stops are adjustably mounted adjacent the periphery of the disk and said lower limit stop has a switch operating cam and an extension for engaging the reversing means which are disposed in fixed, spaced relationship.

16. A honing machine as claimed in claim 14 wherein the reversing means and the switch are disposed in xed spaced relationship, and the lower limit stop on the disk has a switch cam and an extension for contacting the reversing means each rigidly mounted thereon in spaced relationship.

17. In a honing machine the combination of a rotating and a reciprocating tool carrying part, a motor for the part, hydraulic means connected to the motor, v a reversing valve for the hydraulic means, a piston in the reversing valve adapted for movement between two positions for reversing the movement of the part at its limits of reciprocatory motion, means associated with the part foractuating the piston, a pump for normally supplying pressure uid to the hydraulic means, valve means interposed between the pump and the hydraulic means, actuating means operated by the part and adapted to operate the valve means upon completion of the piston reversal for precluding the introduction of pressure fluid to said hydraulic means, a counterbalance valve actuated by the absence of pressure in the hydraulic means and adapted to hold the part at its said limit of motion, and a time controlledmeans associated with the actuating means for breaking the connection between the'actuating means and the valve means after the elapse of a predetermined time to permit introduction of pressure fluid to the hydraulic' `means under the control of the reversed piston position ofthe reversing valve.

CHARLES A. FULMER.

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