US1787782A

US1787782A - Hydraulically-operated vertical drill

Info

Publication number: US1787782A
Application number: US180574A
Authority: US
Inventors: Robert M Galloway
Original assignee: National Automatic Tool Co Inc
Current assignee: National Automatic Tool Co Inc
Priority date: 1927-04-02
Filing date: 1927-04-02
Publication date: 1931-01-06
Anticipated expiration: 1948-01-06
Also published as: DE528245C; GB288168A; FR645296A; DE495283C

Description

Jan 1931- R. M. GALLOWAY HYDRAULICALLY OPERATED VERTICAL DRILL Filed April 2, 1927 5 sheets sheet l I I l l l I L I l l l t l l lv Jan 6, 1931. R. M. GALLOWAY HYDRAULICALLY OPERATED VERTICAL DRILL Filed April 2, 1927 5 Sheets-Sheet 2 m w u Jan 6, 1931. R. M. GALLOWAY HYDRAULICALLY OPERATED VERTICAL DRILL Filed April 2, 1927 5 Sheets-Sheet 5 avwemtoz WWW Gum/meg W Jan 6, 1931. R. M. GALLOWAY HYDRAULIGALLY OPERATED VERTICAL DRILL Filed April 2. 1927 5 Sheets-Sheet 4 l E52 w u Jap 6, 1931. R. M. GALLOWAY HYDRAULICALLY OPERATED VERTICAL DRILL 5 Sheets-Sheet 5 .Fi led April 2, 1927 IIL ?atented Jan, 6, l3l

ROBERT M. GALLOWAY, F RICHMOND, IND w A, ASSIGNOR TO THE NATIONAL AUTO- MATIC TOOL COMPANY,'OF RICHMOND, INDIANA, A COEIORATION OF INDIANA DBA'ULICALLY-OP A VERTICAL DRILL Application filed April a,

even to machine tools generally.

An object of this invention is to-provide an improved form of hydraulic transmission capable of more efficiently translating a movable member, such for example as the toolhead of a multiple spindle drilling machine, than have prior constructions. This object has been attained by the provision of duplicate hydraulic power transmitting devices acting upon opposite sides of the tool-head in the direction of the length of the guide- Ways therefor. An important feature of this invention resides in the particular location of the hydraulic transmitting devices and the points at which the power is applied to the tool-head to efiect its translation. lln certain prior machine tools power to translate the tool-heads has been applied in line with the geometric centers of the heads. In others it has been applied back of the geometric center at a point between the guideways. I have found, however, by careful observation and experiment that better results are obtained by applying the translating power to the head at opposite sides thereof and approximatcly midway between the geometric'center and the back of the head where it engages the guideways.

Another object of this invention is to provide an improved control mechanism for the hydraulic transmission, whereby movement of the tool-head may be initiated and thereafter it will ,continue through a predetermined cycle and finally come to rest after having completed an operation on the work. This improved control includes an automati cally actuated master valve adapted'to control the rate and direction of movement of the tool-head. In prior machines it has been customary to provide a valve of this nature and manually to set the valve initially (in opposltion to a valve-shifting spring) through the action of a suitable lever. Then during the cycle of the machine the valve was, at certain times, released and permitted to move, under the influence of the spring, to

various positions in each of which it effected a difierent rate or direction of movement of the tool-head. This invention proposes to efiect the initial setting of the valve, and also its subsequent movement, by. fluid pressure, whereby the use of levers and springs for this pur ose is obviated. In accordance with the preferred embodiment of this invention, to efi'ect initial setting of the master valve and thereafter a complete cycle of the machine, it

is only necessary that the operator press a push button which is so mounted as to be readily within his reach when stationed before his work.

Another object of this invention is to provide an improved safety control for the machine whereby in any emergency, such for example as the breaking of a tool, the operator readily may cause the machine immediately to discontinue its cycle of operation and to return the head to its initial inoperative position. lhis object has been attained by the provision of a fiuid controlled emergency release for withdrawing certain valve retaining members, later to be described, which causes the valve to be moved to a position wherein it efi'ects withdrawal of the tool-head. A. push button (controlling the release) is supported adjacent the starter button and is more readily accessible than the latter whereby, in case of emergency, the operatorqui'ckly may press the emergency stop button without danger of confusion. This relative accessibility of the starter button and the emergency stop button is one of the features cfif this invention.

Still another object of this invention is to provide an improved hydraulic transmission and a hydraulic control therefor and to provide a single fluid pressure system embodied in the machine to provide fluid pressure for vide an improved lever mechanism adapted selectivel to effect either operation or inoperation o the machine. This object has been attainedthrough the provisionof an improved construction including a manually actuable lever accessible to the operator (and suitable cooperating mechanism) which, when moved in one direction, will shift the master valve to start hydraulic translation of the head and which when shifted in another direction Will actuate the emergency release, thereby to cause the head to be retracted from the work and brought to rest.

Other objects, and advantages will be in part indicated in the following description and in part rendered apparent therefrom in connectlon with the annexed drawings.

To enable others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the va rious wayscontemplated by this invention, drawings depicting a preferred typlcal construction have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote corresponding parts throu hout all the views, of which Figure 1 1s a side elevation of an upright multiple spindle drilling machine embodying the present invention, the drill spindles being omitted. Fig. 2 is a front elevation of the machine illustrated in Fig. 1. Fig. 3 is a detail view, partly in section showing the master valve for controlling the rate and direction of movement of the tool-head, the hydraulically actuated means for setting the master valve, the fluid ressure means normally tending to shift t 1e master valve to a predetermined position; the interference mechanism for controlling the movement of the master valve; and the emergency release for the interference mechanism. Fig. 4 is a detail view showing more particularly the adjustable do s carried. by the tool-head which, at pre etermined times act upon the interference members to effect release of the master valve whereupon the valve is moved to va the rate or direction of movement of the d iTl-head. Fig. 5 is a detail view of a supporting element for the start and emergency stop push buttons and the valves controlled thereby, together with certain fluid pressure and delivery pipes later to be referred to. Fig. 6 is a detail sectional view looking in the direction of the arrows w in Fi 5 and showing, in elevation, the start and emergency stop valves. Fig. 7 is a cross sectional view looking in the direction of the arrow in Fig. 6. Fig. 8 is an elevation, partly in section of the master valve casing, and showin more particularly the adjustable valve' w ich controls the rate of feed of the tool-head durin a drilling operation. Fig. 9 is a detail sectlonal view of the interference members for controlling the shifting of the master valve. Fig. 10 is a side elevation of a manually controlled mechanical shifting means for the master valve and the manual emergenc release for the interference members. ig. 11 is a plan of F1 10.

Referring more particularly to the drawings the invention is disclosed as embodied in a multiple drillingmachine comprising a base 1, upright frame or column 2, over-arm 3, work-support 4, and a tool-head 5 translatably mounted on vertically disposed ways 6 and 7 rovided by the column 2. Power to rotate t e drill spindles (not shown) and also to actuate a gear-pump P, which later serves to supply fluid pressure to effect translation of the tool-head, is preferablyv provided by a motor M mounted on the base 1. Inasmuch as the means for effecting rotation of the drill spindles forms no part of the present invention detailed illustration and description thereof is deemed unnecessary. It will suflice to say that the armature shaft of the motor carries a small ear 8 which drives a gear 9, fixed u on a s aft 10, j-ournaled horizontally in a rive box 11, secured to the column 2. The shaft 10 isconnected, through bevel gears 12 and 13, with an upright. shaft 14 3ournaled at its lower end in the drive box and at its upper end in the over-arm 3. This shaft extends through a protecting tube 15 and is connected at its upper end, through suitable gearing, with a spindle drive-shaft 16 extending into the drill-head and connected to rotate the drill spindles, not shown.

As hereinbefore stated this invention provides an improved hydraulic transmission for effecting translation of the tool-head on its ways; This improved transmission comprises hydraulic c linders 17 and 18 supported by arms 19 an 20, respectively, projecting forwardly and outwardly from the upper end of the column 2.

Pistons

21 and 22 are fitted Within the cylinders 17 and 18, respectively, and these pistons are connected with the toolhead 5 byl means of

piston rods

23 and 24 passing t rough lugs25 and 26 projecting laterally from the sides of the tool-head.

Nuts

27 and 28, threaded upon the

rods

23 and 24 above and below the lugs, normally serve to hold the rods and head against relative movement but permit of relative adj ustment between the head and the rods.

An important feature of this invention resides in the particular location of the cylinders and the points of engagement between the piston rods and the tool-head. Referring particularly to Figs. 1 and 2 it will be seen by are that the cylinders are so located that their piston rods engage the tool-head outwardly beyond the guideways 6 and 7 and intermediate the geometric center (represented by g) and the back of the head 5 where it engages the ways 6 and 7. Many experiments an tests have proven that this particular location of the cylinders and the points of contact between the piston rods and the tool-head maintain the head more freely translatable on the column, better precludes canting of the head on the Ways, and permits the guideways to be located closer together than does any other location of those parts.

In the operation of machine tools of this nature it is desirable that the tool-head first be translated toward the work at a relatively rapid rate thereby to move the tools from their retracted and inoperative positions into engagement with the work without any appreciable loss of time. A relatively slow feeding movement is then given to the head, the rate of which is determined by the nature of the tooling operation andthematerial being operated on. On completion of the tooling operation the head and the tools carried therewithdrawn from the workand inasmuch as this is an idle movement it also may be effected at a relatively rapid'rate.

The rate and direction of movement of the tool-head is controlled by the action of an automatically actuated master valve V (see Figs. 1, 3 and 8) which serves to direct fluid under pressure from the pressure line 29, extending from the exhaust port of the pump, either to the upper end of the cylinders through a main conduit 30 having branch lines 31 and 32 connected with the cylinders 17 and 18 respectively, or to the lower ends of the cylinders through a conduit 33 and suitable branch lines, not shown. To effect the movement of the head toward the work at materially different rates to wit :-At the rapid traverse and the slow feeding rates, the

-master valve is designed and actuated first to transmit to the conduit 30, through abranch 34, a relatively large volume of fluid and then, through a branch 35, a relatively small volume of fluid. Thus it will be perceived, the pump P draws fluid, preferably oil, from a sump S, supported upon the column at the foot thereof, through an intake pipe 36 and exhausts it under pressure through a pressure line 29 connected with the master valve V and also with certain valve controlling mechanism later to be described.

The master valve V is shifted automatically during the operation of the machine to vary the rate and direction of movement of the tool-head in accordance with the nature of the operation being performed.

Referring now to Figs. 3' and 8 it will be seen that the master valve V comprises a casing 37 provided with an intake port 38 with which the pressure line 29 is connected.

This casing also provides

ports

39, 40 and 41 connected respectively with the rapid traverse down conduit 34, the slow feed conduit 35 and the rapid traverse up conduit 33. Fluid underpressure entering the d valve casing. 37 through the port 38 is intermittently admitted to the

ports

38, 39 and 40 by movement of a piston valve 42 slidingly fitted within a cylindrical bore 37 formed in the casing 37 and provided intermediate its ends with a reducedportion 4200 which interference members as now will be described. The valve piston 42 is secured to a slide rod 43 which carries a collar 44 affording an abutment shoulder adapted alternately to engage laterally projecting portions of spring pressed

interference members

45 and 46, slidingly fitted in a housing 47, fixed to a bracket 48, secured to the side of the column 2. The upper end of the rod 43 (as shown in Fig. 3) is provided with a differential piston 49 slidingly fitted within a cylinder 50 supported by the bracket 48. Fluid pressure is transmitted to the cylinder 50 at that end of the piston having the lesser area, by a pipe 51 connected with the pressure line 29, thereby permanently maintaining fluid pressure on the piston 49 and normally tending to move the rod 43 and valve 42 in the direction indicated by the arrow t. This movement, however, is prevented at certain times by

the'interference members

45 and 46 normally maintained in the path of movement of the collar 44 by

expansile springs

45 and 46 each having one end acting on its respective member and its opposite end on a plate 52 supported by the housing 47. The

interference members

45 and 46 are formed with projecting ends 45 and 46?, respectively, arranged within the paths of

dogs

53 and 54 adjustably mounted on a slotted plate 55 secured to the side of the tool-head 5. Thus, during reciprocation of the tool-head, the

dogs

53 and 54 act uponthe ends 45 and 46 respectively, to depress the

interference members

45 and 46. This causes the interference members to release the collar 44 and permit the rod 43 and valve piston 42 to be moved in the direction of the arrow 25, under the influence of the fluid-pressure entering the cylinder 50 through the pipe 51, thereby to vary the rate and direction of movement of the tool-head. At the completion of a intake port 38 with the port 39 ,to effect a rapid downward traverse of the tool-head.

This invention provides improved fluid pressure actuated means valve 42 in opposition to the fluid pressure constantly beneath the piston 49. To that end, a pipe 56 is connected with the cylinder to admit fluid pressure into the cylinder against the end of the piston 49 havmg the greater area. The pipe 56 receives fluid under pressure from the pressure line 29 as will now be explained. The pressure line 29 extends upwardly along the column 2, horizontally along over-arm 3 and downwardly through a tubular casing 57 supported by a housing 58 secured to the side of the overarm. At its lower end the casing 57 has secured to it a housing 59 provided with a central chamber 60, with which the pipe 29 connects, and cylindrical bores 61 and 62. WVithin these bores are slidingly fitted

valve pistons

63 and 64 having reduced intermediate ortions 63 and 64*, respectively, forming uid passage ways. Intermediate the enlarged ends of these valve pistons the hous ing 59 is provided with a transverse port 65 which connects the pressure chamber with the cylinders 61 and 62. v The

valve pistons

63 and 64 are secured upon

push rods

66 and 67, fitted

withpush buttons

68 and 69, respectively, and 'are normally maintained in the positions shown in Fig. 6' by the coil springs 70 and 71. v

The pipe 56 extendsfrom the master valve resetting cylinder 50 upwardly along the columri 2, horizontally along the over-arm and downwardly through the casing 57 and, as shown in Fig. 5, connects with a chamber v72 formed in the housing 59. A port 73 connects the chamber 72 with the cylindrical bore 61. From the foregoing it will be perceived that fluid pressure is constantly maintained in the chamber 60, port and about the reduced portion of the valve piston 63. This pressure is, however, normally prevented from entering the port 73 by the enlarged end 63 of the valve piston 63. When it is desired to start an operative cycle this fluid un-- der pressure is permitted to flow through

ports

73 and 72, pipe 56 intt the upper end of cylinder 50 where it acts upon the end of the piston 49 having the greater area in opposition to the pressure on the lesser piston area thereby depressing the rod 43 and master.

valve piston 42 to the positions shown in full lines in Fig. 3 where it is retained by the interference member 45 positioned in the path of movement of the collar 44. This is efi'ected for resetting the shifted the operator by pushing inwardly on the push button 68' which causes the end 63 of the valve piston 63 to pass beyond the port 73 and thereby establish communication from the port 65 to the port 73 by means of the reduced central portion of the valve piston. Immediately upon release of the push button 68 the spring returns the valve piston to the position shown in Fig. 6 thereby discontinuing the flow of fluid to the pipe 56 and establishin a drain therefrom through the

ports

72, 73, cylinder bore 61, and an exhaust port 74 formed in the housing 59. Thus, as the interference bars 45 and 46 are subsequently tripped by the

dogs

53 and 54 and the rod 43 and the valve piston 42 are moved by the fluid pressure entering the cylinder 50 through pipe 51, the fluid isexhausted from the upper end of the cylinder 50 through pipe 56, through ports 7 2, 7 3, bore 61 and port 74 into the tubular casing 57 through which the

pipes

29 and 56 extend. At its upper end the easing 57 communicates with a chamber 75 formed in the housing 58 and therefore the fluid exhausted through the port 74 will fill the casing 57 and overflow into the chamber 75 from which it is returned to the sump S througha drain pipe 76 (see Figs. 1 and 5).

The cycle of operation of the machine herein described is as follows :-At the completion of one cycle the machine comes to rest with the tool-head in its uppermost position and with the valve in the position shown in dotted line in Fig. 3. Now to effect a succeeding cycle the operator presses the push button 68 which admits fluid'under pressure from the pressure line 29, through pipe 56 into the cylinder 50 above the diflerential pis ton 49. This pressure overcomes the pressure on the opposite end of the piston and forces the rod 43 and valve piston 42 to the position shown in full lines in Fig. 3. As the collar 44, on the rod 43, is depressed the

interference members

45 and 46 are moved outwardly by the

springs

45 and 46 to place the laterally projecting

portions

45 and 46 in the path of movement of the collar 44 and the

ends

45 and 46 in the paths of the

dogs

53 and 54 respectively. The rod 43 having been releases the push button 68 which then moves under the action of the spring 70 thereby discontinuing the pressure t r ough the plpe 56and permitting it to exhaust through port 74, casing 57, and drain pipe 76 back to the sump. With the master valve piston 42 depressed, fluid, under pressure from the pump P, flows through pipe 29 and port 38 into the cylinder bore 37 intermediate the enlarged ends of the valve piston 42 and then outwardly through

ports

39 and 40 and rapid traverse and

slow feed pipes

34 and 35, respectively, to the pipe 30 leading to the upper ends of the cylinders 17 and 18. This eflects a rapid depression of the

pistons

21 and 22 and the tool-head connected therewith. The dog 53 is so adjusted on the head that just prior to contact of the tools with the work the dog engages the end 45 of the interference member 45 thereby depressing it and moving the portion 45 of the member 45 out the path of movement of the collar 44. When the collar is thus released the fluid pressure in the pipe 51 which continuously maintains pressure beneath the piston 49 moves the rod 43 and valve piston 42 axiallv in the direction of the arrow t until the end of the collar 44 engages the interference member 46, which places the piston 42 in an intermediate posi: tion not shown. This movement of the valve piston 42 causes its lower enlarged end to close the port 39 thereby discontinuing the rapid traverse of the tool-head whereupon pressure from the pipe 29 may escape only through the port 40 into the feed pipe 35. As hereinbefore explained the rate of flow through the port 40 is controlled by the needle valve 142, thus the head will then be caused to descend at a relatively slow feeding rate.

When the head has descended sufiiciently to complete the tooling operation the dog 54 will engage the end 46 of the interference member 46 and depress it to cause it to release I P the collar 44 whereupon the rod 43 and valve pistons 42 again move in the direction of the arrow t to the dotted line position in Fig. 3. This movement of the valve wholly disconnects. the feed port 40 from the pressure intake port 38 and connects the latter with the port 41 whereupon the fluid under pressure entering the valve casing through the pipe 29 passes into pipe 33 which conducts it to the cylinders 17 and 18 beneath the

pistons

21 and 22. This causes the tool-head to be retracted at a rapid rate and it comes to rest in its uppermost position with the valve 42 and the valve controlling piston 49 in the positions shown in dotted lines (Fig. 3). From the foregoing it will be perceived that after the rod 43 has been depressed to initiate a cycle, pressure is maintained thereon tending to shift the valve piston 42 to the positions in which it effects a rapid upward movement of the tool-head and that such instantaneous movement is prevented by the interference members which are rendered ineffective at predetermined times to permit shifting of the valve.

Sometimes in the operation of machine tools of this nature (such as for example upon breaking of a tool) it is essential that the machine he not permitted to complete its normal cycle but that the operation be discontinued and the tool-head returned to its retracted position and brought to rest. An object of this invention is to provide improved means whereby this readily may be eltected. To that end I have provided fluid actuated means for withdrawing the

interference members

45 and 46 out of the ath of the collar 44. Upon the bracket 48 have secured a cylinder 7 7 having slidingly fitted therein a fiiston 78 to which is connected a rod 79. is

rod is also connected with the interference member 46 and therefore movement of the piston 78 will likewise effect movement of the interference member. Connected with the cylinder 77 intermediate the piston 7 8 and the interference member 46 is a pressure pipe 80 which, like the

pipes

29 and 56 extend upwardly along the over-arm and downwardly through the casing 57 to the housing 59 where it connects through a port 81 with the cylindrical bore 62. Under normal. conditions the port 81 is isolated from'the fluid pressure entering the bore 62 through port 65 by the enlarged end 64 of the'valve piston 64, but when, in case of emergency, it is desired to discontinue the cycle of operation and return the head to its uppermost position the operator may, by pressing the push button 69, shift the valve 64 inwardly against the action of the spring 71 thereby permitting fluid under pressure to flow through port 65, about the reduced intermediate portion of the valve 64 and outwardly through port 81, and ie 80 into the emergency release cylinder 77. This will move the piston 78 and rod 79 to the right as viewed in Fig. 3, against the action of a spring 833 and will carry with it the interference member 46. As shown in Fig. 9 the

interference members

45 and 46 are so connected together by a pin and slot connection 8384 that this retraction of the member 46 also efiects retraction of the member 45 whereby both interference members are moved out of the path of the collar 44 and the valve 42 is permitted rapidly to move to the dotted line position in Fig. 3 thereby efiecting a rapid upward movement of the tool-head as hereinbefore explained. The pin and slot connection between the interference memhers is so arranged that retraction of the member 45 during normal operation of the machine does not aifect the member 46.

Upon release of the push button 69 the spring 71 returns the valve piston 64 to the position shown in Fig. 6 thereby connecting the port 81 with an exhaust port 82 which leads into the casing 57 thereby permitting exhaust from the cylinder 77 when the piston 78 is subsequently moved to the left, (as viewed in Fig. 3) by the spring 83.

A feature of this invention resides in the location of the start and stop push buttons whereby they are both readily accessible to the operator when in his normal working position and also in the relative degree of accessibility of the two buttons. It is to be observed that I have so arranged the emergency stop button 69 that it projects beyond the starter button 68 whereby the former is more readily accessible than the latter. By means of this relative positioning of the buttons the operator may, in case of emergency, hurriedly depress the emergency stop button without confusion and without looking up from his work.

lVhen the master valve piston 42 is in its uppermost position, as shown in dotted lines in Fig. 3, where it effects rapid upward movement of the pistons 21 and 22 (and thereby the tool-head 5) the port 39 is in communication with an exhaust port 84 in one end of the valve casing 37 and therefore the fluid in the upper ends of the cylinders 17 and 18 may be exhausted through the pipes 34,

ports

39 and 84 and returned to the sump through a pipe 85 connected with the last named port. Likewise when the valve 42 is in its lowermost position wherein it effects rapid downward movement of the pistons and tool-head, the lower ends of the cylinders may exhaust through the pipes 33 port 41, through a central bore 42 in the valve piston 42 and then.

through port 84 and pipe 85 back to the sump. To prevent the building up of excessive pressure in the pressure line 29 any suitable or preferred pressure relief line may be provided, such for example as that shown at 86 in Fig. 1.

In the modified form of the invention illustrated in Figs. 10 and 11 the valve piston 42 is adapted to be shifted to its lowermost position, (in which it effects a rapid downward traverse of the tool-head) by means of a hand lever 100. The return movement of the valve is effected by means of a coil spring 101 surrounding the valve rod 43 and interposed between a stationary lug 102 and a collar 103 secured upon the rod 43. In these views the parts which correspond to the parts hereinbefore described have been similarly numbered and they will be described only in so far as is necessary for an understanding of the modified valve shifting mechanism and emergency release. Bolted to the side of the column 2 is a supporting casting 104 which sustains the housing 47 for the

interference members

45 and 46 and other mechanism later to be described. To this casting is secured one .end of a forwardly projecting bracket 105 which has fulcrumed to it, at its free end by means of pivot pin 106, the lever 100. Journaled in a bearing 107 pro vided by the support 104, is a rock shaft 108 to which is secured at one end an arm 109 having a bifurcated end 109 carrying pins 109 which overlie a collar 110 fixed upon the rod 43. The opposite end of the rock shaft 108 carries a second arm 111 carrying a pin 112 projecting into a slot 113 formed in a link 114 pivoted at its forward end to the lever 100. The arms 111 and 109 form in effect a bell-crank lever, and a spring 115 attached to the former normally maintain the arms in the positions shown in Fig. 10 i. e. with the pin 112 in the innermost end of theslot 113. To set the valve piston 42 to its lowerf most position thereby to initiate a .cycle the operator grasps the lever 100 and pulls it in the direction of the arrow d. This pulls forwardly on the link 114 and due to the engagement of the pin 112 ,with the end of the slot 113 swings the bellcrank lever 109111 clockwise, as. viewed in Fig. 10. This movement of the bell-crank causes the pins 109" to engage the collar 110 on the rod 43 which then is in its uppermost position), thereby depressing the sition to the spring 101. As the collar 44 passes beyond the

interference members

46 and 45, they snap into place in the path of the collar 44 thereby preventing its return under the action of the spring 101. During the descent of the tool-head the

dogs

53 and 54 depress the

interference members

45 and 46 as hereinbefore described and permit automatic shifting of the valve piston 42 thereby to efiect slow down feed of the tool-head and then a rapid upward traverse thereof.

As hereinbefore explained it is sometimes desirable to interrupt the normal cycle of operation of the machine and quickly to retract the tool-head from the work and bring it to rest. With this modified construction this readily may be effected by manipulation of the starting lever 100 in a direction opposite to that in which it was moved to start the machine, or in the direction indicated by the arrow e. This movement of the lever 100 pushes the link 114 in the direction indicated by the'arrow f and causes its rearward end 114to engage and rock an arm 116 fixed upon one end a short rock-shaft 117, journaled in a bearing 118 provided by the support 104. To the other end of the shaft 117 there is secured an arm 119 which carries a stud 120 engaging a head 121 formed on a rod 122 attached to the interference member 46. The interference members-are connected together by a pin and slot connection'as hereinbefore described and therefore retraction of the member 46 by the swinging of the lever 100 in the direction of the arrow e will likewise retract the interference member 45, thereby permitting the collar 44, rod 43 and valve piston to move under the influence of the spring 101 to a position wherein rapid upward traverse is effected.

Without further analysis, will so fully reveal the gist of that others can, by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the priorart, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, 1 claim as new and desire to secure the following combinations and elements, or equivathe foregoing this invention memes lents thereof, by Letters Patent of United States 1. In a machine of the character described, in combination, a frame; a member translat ably mounted thereon; hydraulic means to translate said member on said frame in opposite directions and at a plurality of rates in one direction; a valve adapted to control the action of said hydraulic means; normally inactive fluid pressure means adapted at certain times to act uponsaid valve to set it in one position to effect translation of said member in one direction; pressure means constantly acting upon said valve tendin to move it to other positions in which it e ects translation of said member in another directi on and at various rates; interference means normally acting to prevent movement of said valve under the influence of the last mentioned pressure means; and means, actuated by the movement of said translatable member successively, to render said interference means ineflective thereby to eflect a predetermined cycle of movement of said translatable member. I

2. In a machine of the character described, in combination, a movable member; hydraulic means to move said member in opposite directions and at a plurality of rates in one direction; a controlling valve for said hydraulic means, said valve including a shiftable member having a plurality of operative positions in each of which it effects a difl'erent translation of said member; means acting constantly on said shiftable valve member tending to move it to one of its extreme positions; and fluid pressure means acting in opposition to said constantly acting means to overcome the latter thereby to move said shiftable valve member to its other extreme position.

3. In a machine of the character described, in combination, a movable member; a hydraulic transmission including a constant de- A livery pump and a hydraulic motor adapted to translate said member; a valve to control the action of said hydraulic transmission; fluid pressure means, controlled by the movementof said member, successively to move said valve step-by-step to a plurality of positions' in each of which it effects a different rate or direction of translation of said memher in a predetermined cycle and fluid pressure means to reset said. valve to initiate a succeeding cycle.

4. In a machine of the character described;

in con'ibination, a frame; a member movable thereon; hydraulic means to move said member, said hydraulic means including a cylinder; a piston movable in said cylinder; an operative connection between said piston and said member; a fluid pressure line; conduits connected with opposite ends of said cylinder; a shiftable valve adapted in extreme positions to connect said conduits with said pressure a working cycIe, simultaneously to move line; a rod connected with said shiftable valve; a difierential piston on said rod; a second cylinder within which the differential piston is slidingly mounted; a connection from said fluid pressure line to said second cylinder constantly maintaining fluid pressure on that side of said differential piston having the lesser area thereby tending to shift said valve; automatically actuated interference members controlling the movement of said valve under the influence of the fluid pressure on the diflerential piston; and manually controlled means to admit fluid pressure from said pressure line into said sec-v ond cylinder at the end of said differential piston having the reater area thereby to shift said piston and valve in opposition to the pressure on the other end of said piston.

5. In a machine of the character described, in combination, a movable member; hydraulic means to move said member; a shiftable valve adapted to control the action of said hydraulic means; means tending to shift said valve through a pluralit of operative positions; interference mem ers acting to prevent shift-ing of said valve; means, controlled by the movement of said movable member, successively to render said interference members inefi'ective to prevent shifting of said valve; and an emergency release for said valve comprising fluid pressure means for simultaneously rendering all of said interference members in effective.

6. In a machine of the character described, in combination, a movable member; hydraulic means to move said member; a shiftable valve adapted in various positions to vary the action of said hydraulic means; a rod connected to said valve; fluid pressure means acting on said rod to shift said valve; an abutment shoulder on said rod; interference members arranged in the path of said shoulder and preventing movement ofsaid rod and valve; means, controlled by the movement of said head, successively and periodically to render said interference members ineflective to prevent movement of said rod and valve; and'manually controlled fiuid pressure emer ency means, operable during all of said interference members out of the path of said abutment, thereby to permit said valve instantly to receive its complete move ment under the influence of the fluid pres-- sure means acting thereon.

7 In a machine of the character described, in combination, a movable member; hydraulic means to move said member; a shiftable valve adapted to control the action of said hydraulic means; fluid pressure means tending to shift valve through a plurality of operative positions; interference members acting to prevent shifting of said valve; means controlled by the movement of said movable member successively to render said interference members ineffective to prevent shifting of said valve; and an emergency release for said valve comprising a manually controlled fluid pressure means for simultaneously rendering all of said interference members ineffective.

8. In a machine of the character described, in combination, a movable member; a hydraulic transmission to translate said memher; a valve to control the action of said hydraulic transmission; fluid pressure means, controlled by the movement of said member,

successively to move said valve step-by-ste to a plurality of positions in each of which it effects a difl'erent rate or direction of translation of said member in a predetermined cycle; fluid'p'fessure means to reset said valve to initiate a succeeding cycle; a valve for controlling the last mentioned means; and a push button control for said last named valve.

9. In a machine of the character described, in combination, a translatable member; h draulic means to move said member; a shi table valve adapt'ed to control theactions of said hydraulic means; means tending to shift said valve through a plurality of operative positions; interference members adapted to hold said valve in certain ones of its operative positions; means actuated by the movement of said translatable member successively to render said interference members ineffective, thereby to permit said valve to move to its next operative position; an emergency release for said valve comprising a cylinder; a'piston movable in said cylinder; an operative connection between said piston and said interference members; a fluid conduit connected with said cylinder; a fluid pressure line; and a manually controlled valve' adapted to admit fluid pressure from said line into said conduit, and thereby into said cylinder, to retract said piston and said interference members.

10. The combination set forth in claim 9 in which the emergency control valve is adapted to be actuated by a push button supported accesible to the operator when in his normal working position.

11. A machine tool combinin a frame; a member translatably mounted t ereon; hydraulic means to translate saidmember; a valve for controlling said hydraulic means; fluid pressure means to move said valve in one direction to initiate an operative ycle;

means tending to shift said valve in e opposite direction to cause it to vary the action of said hydraulic means; a plurality of interference members adapted successively to arrcst'said valve in various operative positions; means operative upon movement of said member to cause interference members to release said valve; emergency means for simultanousl renderingi all of said interference mem ers ineffective to restrain said valve against movement; and independent manually actuable means located readily accessible to the operator for controlling said fluid actuated means and for actuating said emergency means.

12. A machine tool combining a frame; a member translatably mounted on the frame; hydraulic means to translate said member;- a valve connected with said hydraulic means and adapted to control the action thereof, said valve having two positions fluid conduits extending to said resetting.

means and to said emergency release mechanism; and means selectively to connect said fluid pressure line with either said resetting means or said emergency release mechanism.

13. A machine tool combining a frame; a member translatably mounted thereon; hydraulicmeans to translate said member; a master valve adapted to control the action of saidhydraulic means; a piston connected with said valve; a valve resetting cylinder within which the piston is located; means normally tending to move said valve; interference means to prevent movement of said valve; a fluid actuated piston adapted to render said interference means ineffective; a cylinder enclosing said last named piston; a tubular casing supported from said frame; a fluid pressure line located within said casing; two fluid delivery conduits located within said casing and extending to said valve resetting cylinder and to the cylinder containing said interference-means controllin piston respectively; a valve housing carrie y said casing; a pair of valves in said housing; means to actuate one of said pair of valves to connect said pressure line with the conduit leading to the master valve resetting cylinder; and means to actuatethe other of said pair of valves to connect said pressure line with the interference member retracting cylinder.

14. The combination set forth in claim 13 characterized by this that the pair of valves are normally kept closed and push buttons are connected with said valves to enable the operator to open them at will.

15. The combination set forth in claim 13 characterized by this that the pair of valves are normally kept closed; that push buttons are connected with the valves to enable the operator to open them at will,'and that one of said buttons is more readily accessible than the other.

16. A machine tool combining a frame; a member translatably mounted t ereon; fluid pressure means for translating said member, said fluid pressure means including a cylinder, supported by said frame a piston in said cylinder and operatively connected with said translatable member; a fluid pressure line connected with opposite ends of said cylinder; a master control valve'for said fluid pressure means; fluid actuated means to shift said valve; a closed casing supported from said frame and having one portion extending to a position accessible to an operator when in his normal position; a fluid pressure line within said casing; a conduit within said casing and extending to the shifting means for said master control valve; a valve supported by the accessible end of said casing and adaptedupon manipulation to admit fluid pressure from the pressure line in said casing into said conduit and to said master valve shifting means.

17. The combination set forth in claim 13, in which the actuating means for the pair of valves comprise push buttons connected with the valves and in which the push button connected with the valve which controls the flow of fluid to the means for rendering the interference means inefl'ective is more readily accessible to the operator thanthe button which controls the master valve resetting mechanism.

18. A machine tool combining a frame; a member translatably mounted thereon; a closed casing supported b said frame; fluid pressure means to trans ate ,said member; said means including a cylinder and a piston therein, one of which is connected with the frame, and the other of which is connected with the member; fluid pressure conduits connected with opposite ends of said cylinder; a source of fluid pressure; a master control valve interposed between said source of fluid pressure and said conduits and adapted by movement to control the flow of fluid from the former to the latter; fluid pressure means for shifting said valve; said means comprising a fluid pressure line in said closed casing; a conduit connected with said valve shifting means and extending into said casing; a valve supported by said casing and adapted to connect the pressure line in the casing with the conduit connected with the valve shifting means; and push button means to actuate the last named valve.

19. A machine tool combining a frame; a

member translatably mounted on the frame;

hydraulic means to translate said member; a master control valve for said hydraulic means; means normally tending to move said valve from one operative position to another; an interference member adapted to prevent movement of said valve; fluid pressure means to cause said interference member to release said valve thereby to permit it to be moved from its initial position; fluid pressure means to reset said valve; a casing member depending from the upper end of said frame; a fluid pressure line within said casing; a valve housing supported by said casing; a fluid pressure chamber in said housing said chamber being connected with said fluid pressure line; fluid delivery conduits within said casing and connected with said valve resetting means and said releasing means; ports connecting said fluid pressure chamber with said conduits; auxiliary valves normally closing said ports; exhaust ports normally connecting said conduits with the interior of said casing; manual m'eans to shift said valves to connect said pressure chamber with said conduits;'means to return said auxiliary valves to their initial position to connect said conduits with said exhaust ports thereby to permit the fluid used to effect resetting of the master valve and to actuate said release to be exhausted into said casing.

20. The combination set forth in claim 19, in which the fluid pressure to actuate the head translating means, the valve resetting means and the means to move the interference member, thereby to permit movement of the master valve, is provided by a pressure pump which draws liquid from a suitable sump and in which the casing member which supports the auxiliary valves is connected with the sump by a suitable drain, thereby to return to the sump the fluid exhausted into the 'casing.

In witness whereof, I have hereunto subscribed my name. ROBERT M. GALLOWAY.