US2052647A

US2052647A - Machine tool

Info

Publication number: US2052647A
Application number: US322798A
Authority: US
Inventors: Fred A Parsons
Original assignee: Kearney and Trecker Corp
Current assignee: Kearney and Trecker Corp
Priority date: 1928-11-30
Filing date: 1928-11-30
Publication date: 1936-09-01
Anticipated expiration: 1953-09-01

Description

Sept. 1, 1936. F. A, PARSONS MACHINE TooL Filed Nov. so, 1928 s 'sheets-sheet 1 ATTORNEY` Sept. 1, 1936.

F. A. PARSONS MACHINE TOOL 5 Sheets-Sheet 2 Filed Nov. 50, 1928 Fig. 2

ATTORNEY Sept. 1', 1,936. F. A. PARSONS MACHINE TOOL' 5 sheets-sheet 3 Filed Nov.v 30, 1928 ATTORNEY Sept. l, 1936. A. PARSONS MACHINE TOOL Filed Nv. 3o, 19223` 5 Sheets-Sheet 4 ATTORNEYl Sept. l, 1936. F.A. PARSONS MACHINE TOOL Filed Nov. 30, 1928 5 Sheets-Sheet 5 n FlglS 55 B4 83 s2 o INVENTOR l,

ATTORNEY Patented sept. 1, 1936 PATENT OFFICE MACHINE TOOL Fred 'A. Parsons, Milwaukee, Wis., assignor to Kearney & Trecker Corporation, West Allis,

Wis.

Application November 3o, 192s, serai Ne. 322,198

52 claims. y(ol. sil-21.5)

This invention relates to machine tools and more particularly to transmission and control mechanism therefor.

It is a purpose of the invention to provide an improved transmission which is in part hydraulic and in part mechanical.

' A further purpose relates to improved control mechanism which is in part hydraulic and in part mechanical.

Another purpose relates to an improved relationship between spindle and table transmissions and improved control mechanism for the combination.

Another purpose relates to improvedl control l5 mechanism incorporating a power shift controlled either manually or from the power movements of the machine. y

Another` purpose relates to a power shifter capable of a variety of shifting movements such for instance as to move a reverser to forward. re-

verse and -neutral positions land to the selective control of such a shifter either manually or from power movements of the machine.

Another purpose relates to a transmission arrangement and control to prevent operation of a spindle train when a table transmission is inoperative, or when the table transmission is operative at a'rate other than a cutting rate, such as a quick traverse rate.

-. Another purpose relates to transmission and control mechanismproductive of cycles of machine operaticn, controlled from the movements of the machine, and with Various work and tool movements synchronized.

85 Another purpose is generally to simplify and The invention consists in the arrangement and` combination of parts herein illustrated, described and claimed and in such modifications of the structure illustrated asmay be equivalent to the claims.

In the drawings, thesame reference characters have been applied to the same parts in each o the several iviews, of which: I

Fig. 1 isa right side elevation of a milling machine incorporating the invention.

60 Fig. 2 is a front elevationof the same machine.

Fig. 3 shows a front elevation of certain units of the milling machine enlarged.

Fig. 4 is a plan view of the unit shown in Fig. 3, partly in section along linel 4-4 of Fig. 3. Fig. 5 is a plan view of part of the unit shown in Figs. 3-4 partly in section along line 5 5 of Fig. 3.

Fig. 6 is a` partial transverse section along line 6-6 of Fig. 4. l

Fig. 7 is a partial transverse section along line 5 '1 -1 `of Fig. 4.

Fig. 8 is a diagrammatic view showing the relationship and construction of certain table transmission and control mechanism.

Fig. 9`shows a vertical section taken along line 1U 8 9 of Fig. 2.

Figs. l10 and l1 show diil'erent table control dogs.

Fig. 12 is a diagrammatic view showing the relationship and construction of certain table 15 transmission and control mechanism.

Fig. 13 is a diagrammatic view showing fast and slow transmission drives.

Fig. 1 4 shows a partial transverse section along line 'I4-I4 of Fig. 13.

Fig. 15 shows driving means for an auxiliary Pump.

Figs. 16 and 16a show details of a lost motion control device.

l The milling machine includes a base or sup- 25 pori'.` I. a table or support 2, reciprocably supported therefromja head or support 3 adjustably fixed on the base adjacent the table, and a spindle carrier or support l supported from head 3 for vertical movement. The spindle carrier 4 sup- 30 ports a rotatable tool spindle or tool support 5.

Transmission mechanism is provided for spindle E as follows:

A pulley 6, intended to be operated at constant speed, Figs. 1 and 13, is ilxed on a sleeve 1 rotat- 35 ably supported in a bracket 8 fixed on the bed' I. Fixed with sleeve 'I is a member 9 of a friction clutch generally denoted by numeral I0 and'having a member II slidably keyed on a shaft I2 for lmovement to engage or disengage complementary 40 friction surfaces on the members 9-I I. Member II provides an extended hub or sleeve I3 upon which is iixed a friction member Il adapted in the one direction of movement of the member II to engage a friction surface thereon with com- 45 plementary friction surface I5 fixed with bed I, forming a brake generally denoted by'the numeral ISA. The arrangement provides a device operative in the one direction of movement of the hub I3 as a motion interrupting clutch to 50 drive shaft I2 from pulley 6 and in the other direction of movement to form a brake for the shaft I2. Shaft I2 drives a shaft I6, Fig. 1, through bevel gears I'l-lil. Shaft I6 drives a shaft I9 through a rate changer generally de- 55 f noted by the numeral 28 and consisting of different diametered gears 2|22 removable and interchangeable between ends of the shafts. Fixed on shaft I9 is a pinion 23 engaging gear 24 journaled in head 3 and prevented from axial movement, there being a shaft 25, Fig. 2, journaled for movement with carrier 4 and slidably splined in an axial bore of gear 24. Shaft 25 drives spindle 5 through bevel gear 26 fixed on shaft25 and meshing with gear 21, fixed on the spindle.

The pulley 6 also drives a transmission for table 2 as follows: A fluid pump generally denoted by the numeral 28, Figs. 1-4-8-12, is driven l5 from a shaft 29, which in turn is driven at either a fast or slow rate as will be described. Pump 28 actuates table 2 through a reversing valve generally denoted by the numeral 38, Figs. 4-8, and a hydraulic cylinder or motor 3| having a piston 32 fixed on a piston rod 33 with which table -2 is fixed for movement. Pump 28 may be of any suitable form but as here shown is of a construction similar to that fully shown and described in the United States Patent No.

1,678,050 issued July 24, 1928, and will therefore be only briefly described.

Housing portions 34-35 form a substantially closed casing 38, Figs. l-4, fixed on a bracket or housing 31, which in turn is fixed with bed I.

A pump housing member 38, Fig. 4, fixed with member 34 extends within the casing 36 and removably fixed therewith is a pump housing member 39. Portions 48-4I-42-43 of the housing members 38-39 form trunnions through which 35 ports or passages 44-45 respectively open into opposite sides of a spherical chamber formed within the housing members 38-39 and having the sphere center coincident with the axis of shaft 29. The trunnions mentioned support ring 40 members 46-41 fixed with a member 48 whereby rings 48-41 and member 48 form a unit sup- `ported and guided for movement about an axis passing through the center of the spherical chamber andl at right angles with the axis of shaft 29. Journaled in member 48 is a shaft 49 having its axis at right angles to the trunnion axis about which member 48 moves and passing through the center of the spherical chamber in any position of member 48. vFixed on shafts 29 50 and 49 respectively are members 50-5|. An intermediate member 52 isl pivoted both with member 50 and member 5|, the respective pivots beingat right angles to one another and each passing through the center of the spherical 55 chamber. 4

Member 50 driven from the shaft 29 drives intermediate member 52 which in turn drives member 5| and shaft 49 andthe arrangement is such as to form four separate substantially closed chambers within the spherical chamber each of which is alternately expanded and contracted during each revolution of the parts if member 48 is positioned for the axis of shaft 49 to stand at an angle with the axis of shaft 29. The amount of volume change in each such chamber during revolution is proportional to the angle between the axes of shafts 29-49, being zerowhen the shafts are aligned. The position and form of ports 44-45 and of the various parts is such `that the several chambers each rotate to maintain communication with the one port during expansion and with the other port during contraction whereby fluid supplied to the one port will be forcibly expelled from the other thus creating a positive now of fluid through the pump. Although a pump such as described will change its direction -of flow as the position of shaft 49 is shifted to the one side or the other-of the axis of shaft 29, in the present instance the pump is never reversed, other reversing means being provided 6 as will be described. lThe shaft 49 and member 48 are, however, adjusted to regulate the volume of pump flow and for such purpose means will be later described. l

Pump 28 may be driven either at arelatively 10 fast rapid traverse rate or at a relatively slow feed rate as follows: Fixed with clutch member 9, Fig. 13, is a gear 53 meshed with pinion 54 fixed on a shaft 55 whichv may drive shaft 29 through a clutch generally denoted by the nul5 meral 55a, and including a clutch member 58 fixed on shaft 55 and having a friction face complementary to a friction face 51 of a clutch member 58, the extened hub 59 of which is slidably keyed with the shaft 29, whereby the clutch 20 members 58--58 may be engaged or disengaged according to the position of the member 58.

Shaft I2 is extended forwardly and xed thereon is a sleeve 68 having 'a portion 68a positioned within a bore 6| of a gear 82 rotatable on the 25 shaft. The portion 68a of sleeve 68 is provided with a series of cam surfaces 63, Fig. v1li, and positioned between such cam surfaces and the vbore 6| are a series of rollers 64 spaced apart by portions projecting from a member 86 rotat- 30 able on the sleeve 88. Member 86 together with rolls 64 is continuously urged in' a direction to bind the rolls between the cam surfaces 63 and bore 6| by means of a spring 81 and when so y positioned the rolls will drive the gear 62 from 35 the shaft I2 but will not permit the shaft to be driven from the gear when the gear is driven at a. higher rate than the shaft, the arrangement constituting an overrunning rclutch device generally denoted by the numeral 82a. gages a gear 68 fixed on the clutch member 58 and the arrangement is such that wheny clutch I0 is engaged, pump shaft 29 will be driven from shaft I2 at a relatively low feed rate unless the clutch 56a is also engaged, in which case the 45 shaft 29 is rotated in the same direction as before but at a faster or rapid traverse rate, the shaft 29 then being driven from the shaft 55. If the clutch ID is not engaged, whereby spindle 5 is not rotated, then pump 28 cannot be actuated 50 at a feed rate because shaft I2 is not actuated, but the pump may still be driven at a rapid traverse rate from shaft 55, according to the engagement of clutch 58a.

The channels leading from pump 28 to the 55 cylinder 3| through reverser valve 3l) are as follows: Referring to Figs. 3-4-8, the pump ports 44-45 respectively lead to the ends of closed channels 69--18 which terminate at the other end in ports 1I-12', Figs. 6-7 respectivelyadjaso cent opposite ends of a movablevalve stem or member 13 of valve 38. Adjacent port 12 are a. plurality of ports 14--|5, Fig. 7, and adjacent port 1| are a plurality of ports 1li-11, Fig. 6.

The ports 15-11 each communicate with a chan- 85l nel 18, Fig. 8, leading to the right hand end of the cylinder 3|. and ports 14-16 each communicate with a channel 19 leading to the left end of the cylinder. The direction of rotation and all positions of adjustment of pump 28 are such that' 70 fluid enters the, pump through valve port 12, v channel 18 and pump port 45, and is' expelled from the pump through pump port 44, channel 69 and valve port 1|; and the valve stem 13 is cut away as shown in Figs. 6-7, to lead the fluid 75 CFI from valve port 1| through the valve stem and valve port 16 into the channel 19 to the left end of the cylinder 3|, when the valve stem is in the position there'shown thus moving theV piston and table to the right. At the same time the cut away valve portions connect the channels for the fluid from the right hand end of cylinder 3| to be expelled through channel 18, valve ports 'I5-12 and channel 10 to pump port 45. If the valve stem 13 is turned one quarter turn from the position shown in Figs. 6-7, the connection of the pump inlet and outlet ports with the cylinder will be reversed and the table -will move in the other direction. The-ports II-'l2 are made relatively large in order that an intermediate position of the valve stem will simultaneously open both the ports 1|-12 to both of the channels 18-19 in which case the ports 1|-12 will communicate with one another thus by-passing the pump 28, whereupon the table will stop. In such case channels '|8-19 are also freely connected thus by-passing thefluid from the one side of the piston to the other, whereupon the table may be moved by suitable manual means, (not shown).

Shifting mechanism is provided for moving the various clutches and reversers by power and controlled either manuallyr or in accordance with the movement of table2.

Such shifting mechanism is hydraulically operated by the means of a pump generally denoted by the lnumeral 80, Figs. 1-2-8-9. Pump80 may be of any suitable type but in this case includes a plunger 8|, Figs. 4-9-15, which is moved in the' one direction by the means of a cam 82, Figs. 9-15, xed on shaft 55 and having a follower roll 83 pivoted on the one end of a pivoted lever 84, the other end of which actuates plungery 8| in the direction of movement thereof. In the other direction plunger 8| is actuated by a spring 85. I'he end of the plunger 8| operates in a chamber 86, Fig. 9, and in the one direction of plunger movement uid will be drawn into the chamber from a reservoir 81 formed of the housing mem- 1 ber 31 and the several housing members associated therewith, the uid being drawn through an opening 88, a bore 89, a channel 90 communicating with an annular groove 9| in a closure member 92, a channel 83 from the annular groove 9| to a channel 94 in the closure member, and a valve consisting of a ball 95, yieldabl,l seated by the means of a spring 96 in a manner to prevent fluid returning from chamber 86 to reservoir 81 through the valve. v

In the other direction of movement of plunger 8| the uid drawn into chamber 86 as described will be ejected through an opening 91, Fig. 9, and

a valve consisting of a ball 98 pressed by a spring ynel |03 and capable of a variation of volume by the movement of a plunger or piston |04 slidably fitted in the bore 89. ,Piston |04 may-move in bore 89 against the resistance of a spring |05 and will do so whenever the volume delivered from pump 80 is greater than the iluid delivered through channel thereby accumulating a volume of fluid in the chamber |02 and under pressure from spring |05. By virtue of accumulator |02A the volume delivered from pump 80 may be small relative to the instantaneous requirements .of the shifters operated therefrom, the capacity of accumulator 02A being sufcient to provide for such instantaneous requirements.

The pump 80 operates continuously whenever the pulley 6 is operated since it is then always driven from shaft 55. 'Ihis is to provide at all times for the operation of shifting mechanism operable therefrom and in order that pump 80 shall provide for unusual as well as normal conditions of operation the volume of pump 80 is large relative to the total volume of iluid required for the normal operation of all the Shifters over a given period of time. Therefore in order to avoid power loss, mechanism is provided as follows:

The accumulator piston |04 moves in the bore 89 through which fluid is supplied to the inlet of the pump as described, and afterpiston |04 has moved sufficiently due to the -accumulation of a desired volume of fluidin chamber |02, the end of the piston passes the intake opening 88 and closes the pump inlet. Thereafter the pump consumesv relatively very little power until suchy time as fluid is drawn from chamber |02, since the pressure of fluid from chamber |02 is prevented by ball 98 from acting against the plunger 8|, until s'uch time as iiuid is drawn from the chamber |02, thereby again opening the pump inlet. The operation is such that power is consumed substantially only in the amount actually required for the operation of the Shifters actuated from the accumulator and pump.

The pump 28 as previously mentioned, is adjusted for various volumes to determine the rate of table feed when the pump is actuated at a feed rate. When operated at a quick traverse rate it is preferable that the pump should be adjusted to a position of predetermined volume, whereby the quick traverse rate will be constant and independent of the variation in feed rate. To accomplish the various adjustments mentioned the pump 28 is shifted to a predetermined maximum volume whenever clutch 56ais engaged to engage the quick traverse drive and is again shifted Ato a feed position predetermined in accordance with the setting of a feed control device whenever the clutchA 56a is disengaged to drive the pump at a feed rate through the overrunning clutch device 62a. Mechanism for the above purposes is as follows:

A'pump adjusting rod or plunger |06, Figs. 3-4-12, projects within casing 36 to engage sultable rack teeth |01, Fig. 9, thereon with complementary teeth |08 on the periphery of the ring member 46, the upper end of rod |06 being provided with a pivoted cam roll |09, Fig. l2, operating in a cam groove formed in a member 0, Figs. 3-9-12, guided for movement to right or left in Fig. 3. Member ||0 is connected for movement with a member Figs. 3-5, by the means of abutments 2| I3 Fig. 5 fixed with the,

respective members and a screw member ||4 having a head portion |I5 engaging abutment I2 to restrain the screw for axial movement with member H0, and having a portion ||6 threadedly engaging the abutment H3. The screw 4 may be turned to increase or decrease the spacing of the members |0 by the means of a hand lever ||1, Figs. 1-2-3-5, fixed on a shaft ||8, Fig. 5, upon which is also fixed a gear ||9 engaging a gear fixed on a shaft |2| having fixed thereon a bevel gear |22 engaging a gear |24 xed on a shaft |25, the end |26 of which is slidably splined within an axial bore |21 of the screw ||4.

' nism as follows:

When plunger |30, Fig.,12, is movedto admit fluid to channel |38, the clutch 56A,Fig. 13, will by the mechanism described, be disengaged `whereby to drive pump 28 at a feed rate through lby screw ||6 and lever ||1, Fig. 5, relative to member to the extreme of its adjustment to the riglrirI in Fig. 12, that is to say, to stand as far as possible from member the roll |09 will move throughout the travel of member ||0 in a lower portion of the cam groove and the pump 28 will be maintained in a position of maximum fluid delivery not only when clutch 56A is positioned for a quick traverse but also when the clutch is positioned for a feed. Under such conditions a shift of plunger |30, Fig. 12, to a feed position will result in a maximum. feed. As the member I0 is adjusted by lever |1 to a position ycloser -to the member the roll |09 will at the end of the left` handk or feed direction of movement of member ||0 have moved progressively farther up the angular slot, the total upward movement at the end of the feed movement of member 0 determines the position of adjustment of pump 28 and the rate of feed. The lever I l1 is movable with a. pointer or index member |64, Figs. 2-3-5, movable against a chart or index scale |65 suitably graduated preferably in numerals, not shown, to indicate different rates of feed, and the connection of lever ||1 for adjustment of member ||0 is such that the indicator at all times remains positioned to indicate the feed which will result when a feed shift has been made.

The pump 28 may be considered as a rate changer of which portions are adjustable for altering the rate of the table. 'I'he lever |1 and associated parts constitute a rate selector operable independently of the adjustment of the rate changer, that is to say, it can be set for a desired rate without adjusting the rate changer, which may be later power adjusted by the operation annular groove |69 in the hub of the clutch member. At the other endlever |66 has a portion |66a engaging a slot |10 in a piston |1|, the opposite ends of which work in cylinders |12| 13 respectively. The cylinder |12 is connected to be operated from fluid in the feed channel |38, Fig. 12, by the means of a.l pipe or channel |14, Figs. 1-12-13, whereby the clutch I0 will be engaged by fluid from pump whenever the plunger |30 Fig. 12, is shifted to a feed position. The cylinder |13 is similarly connected with the channel |44 by the means of a pipe or channel |15 whereby fluid from pump 80 will disengage clutch I0 and engage brake |5A whenever the plunger |30 is shifted to quick traverse position.

The reverser valve 30 is moved by the means of uid derived from pump 80, as follows:

with channel |36 whereby channel |80 is continuously supplied with fluid under pressure. A

recess |82 in plunger |19 communicates with channel in any position of plunger |19 and supplies fluid to a passage or port |83 through the plunger. Ports |84|85I86 are positioned to receive fluid from port |83, one at a time, in different positions of plunger |19 respectively, and respectively communicate with diierent cylinders |81|88|89 through different channels |90- |9|-|92. The cylinders |81|99 are arranged for opposite movement respectively of a piston |93 and will move the piston to the limit of its travel in either direction in accordance with the position of plunger |19 to deliver fluid to the one or the other port |84-|06.

Cylinder |88 actuates a piston |94, havinga head portion |95 adapted to cooperate witha V notch or cam |96 associated with piston |93 in a manner such that when piston |94 is actuated by positioning plunger |19 to deliver fluid to port and cylinder |88, the piston |94 will move piston |93 to an intermediate or central position from either of the other positions to which it may' previously have been moved by cylinders gaging a segment pivoted on stem 13 of valve 30, Figs. 4 8.

When plunger |19 is positioned for any cylinder |81-IB8-I99 to receive fluid the other cylinders are opened for exhausting fluid contained therein, there being recesses or cut away portions |99a-|99b, Fig. 8, provided for this purpose in the plungerr |19 adapted to receive uid from the ports |84|85I86 and to by-pass such fluid along the plunger to return to the reservoir 81, Fig. 9.

By the construction described reverser 30 may be positioned by power derived from pump 00 and controlled from lever |16 in a manner to control the forward, reverse or stop of table 2.

The plunger |30, Fig. 12, may be shifted by power in accordance with movement of. table 2 by the following mechanism.

A plunger 200, Figs'. 4 5-10, adjacent plunger |30 is connected for movement therewith by the means of suitable rack teeth 20| on plunger 200 engaging a segment 202 fixed on shaft |29, and by the train previously described connecting shaft |29 with plunger |30. The connection is such that the one plunger is moved up when theother is moved down. Either upwardly positioned plunger may be shoved back down again by the means of dogs such as a dog 203, Figs. 8-10. Since the dogs for either plunger and for either direction of table travel are similar in construction, only dog 203 will be described.

Referring' to Figs. 8-10, the dog provides a body portion 204 adjustably fixed on table 2 by the means of a T bolt 205 and T slot 206 and of a size suited to bring a-latch 201 into apath of movement to contact the desired plunger |30 or 200, the latch being swiveled on a pivot pin 208,

and limited for movement in one direction about such pivot by contacting a portion 209 of the body. being normally pressed against such portion by a spring 2|0. Right and left hand dogs are used respectively pivoted for movementofl the -latch in diiferentdirections about the pivot in accordance with the direction of table travel inwhich the dog is to be used, whereby the latch will operate the plunger in one direction of table travel but will swing about the pivot without operating the plunger in the other direction of table travel. There is provided a detent device for plunger |30 generally denoted by the numeral 2| Fig. l2 and including cam portions or notches 2|2-2I3 fixed with plunger |30 to register with a suitably formed plunger 2|4 respectively7 when plunger |30 is in the different operative positions. by a spring 2|5 and the relationship is such that when the ports approach a position of registry the det-ent acts to quickly move the plunger |30 into a position of full registry independently of the rate of dog and table movement, also to retain such position in spite of such force as maybe exerted on the plunger by spring 2|0 during backward movement of the dog 203.

It is obvious that suitable dogs such as 203 may Plunger 2|4 is strongly pressed be used to shift plunger |30 to either feed or quick traverse .positions at any desired point or points in either direction of table travel.

The plunger |19, Fig. 8, may be shifted by power in accordance with the movement of table 2 by the following mechanism. Al plurality of sleeve |11 and extending through the sleeve to.

be connected for movement therewith through a lost motion device generally denoted by the numeral 223. Lost motion device 223 includes an l abutment member 224 fixed on shaft 222 and positioned to be contacted in opposite. directions byl screws 225-220 respectively carried by ears or lugs 221-228 xed on sleeve |11, whereby to move theplunger |19 from plungers 2|6 or 2|1. A movement of hand lever |16 to. cause a table movement through mechanism previously described will move the one or the other of plungers 2|6-2l1 upwardly. Either upwardly positioned plunger may be shoved back down again by the means of. dogs such as dog 229. Figs. 8-1i. Since the dogs for either plunger and for either direction of the table travel are similar only the dog 229 will be described. Referring to Figs. 8-11 the dog 229 includes albody portion 230 adjustably xed on table 2 by the means of a T bolt 23| engaging the T slot 206 and having a downwardly projecting portion with angular faces 232-233 adapted to engage the ends of the one or the other of plungers 2li-2H and move the plungers downwardly during movement of i the table, the body portion of different dogs being of a size sufcient to position the downwardly projecting portion in a path to contact the one or the other plunger which'it is desired to move.

A detent device vgenerally denoted by the numeral 234, Figs. 16-16a, includes a cam member 235 fixed with the shaft 222 and having a central notch 231 positioned betweentwo cam surfaces and engageable by a plunger 238 pressed by a spring 239 when the cam is in the central position of theA movement with shaft 222. On either side of central notch 231 are ca m surfaces 24U-24| respectively adaptedto urge shaft 222 in opposite directions.A When screws 225-226 are each set up against abutment 224 whereby-l vnotch will quickly forcethe parts to a position of full registry of the ports |83-|85, irrespective of the rate of table movement, and the reverser valve 30 will be immediatelypositioned to stopl the table. l

If, however, the one or the other of screws 22B- 228 is adjusted to provide sufficient lost motion between cam 235 and plunger |19, then in the corresponding direction of movement of cam 235 from a dog 229, the central notch 231 will completely pass the point of plunger 238 before the plunger has moved theports |33-I85 into registry sufflcient to shift reverser valve 30 to stop the table, and immediately thereafter the cam 235 will shift the plunger |13 quickly past such registry of ports and into a position of port registry which` will shift valve 30 to opposite position thereby reversing the movement of table-2. Such reversal of table movement may take place at either or both ends of. the table movement accordingly as one or'both of the screws 22S-226 are adjusted for suitable lost motion between cam 235 and plunger |13.

What is claimed is: l. In a machine tool the combination of a tool support and a work support, transmission mechanism for actuation of one of said supports including areverser having forward, reverse and disengaged positions, three elementsy respectively operable to move said reverser to different of said positions from either other position, power meansl for movement of said reverser, and control means selectively operable to connect said power means to move said reverser through any of said elements one at a time. l

2. In a machine tool the combination of a tool support and a work support, transmission mech.- anism for actuation of one .of said supports including a reverser having forward, reverse and disengaged positions, a i'lrst element voperable for shifting said reverser to said disengaged position from either other position, a second element operable 'for shifting said reverser to said forward position from said disengaged position, a third element operable for shifting said reverser from said disengaged position to said reverse position, each of said elements being operable to shift the reverser as described without passing through a third one of. said positions, power means for movement of said reverser, and control means selectively operable to connect said power means to move said reverser through any of said elements one at a time. f

3.`.In a machine'tool the combination of a tool 4 support and a work support, transmission mechand shiftable to connect said source with any of said devices one at a time.

4. In a machine tool the combination of a tool support and a work support, va transmission for actuation of-one of said supports including a reverser shiftable to forward, reverse and disengaged positions, three fluid operable elements respectively for movement of said reverser to different of said positions. a fluid source, valve means receiving fluid from said'source-a'nd. adjustable to connect said source to different of said elements one at a time', and dog operated means for adjusting said valve means in'accordance with the. movement of said support.

5. Ina machine tool having a movable work` support and arotatable tool support, the combination lof transmission trains respectively for diiferent'of said supports and each including an element shiftable for altering the effect of the train with which it is associated, fluid operable shifting devices respectively for different of said elements, a fluid source, and control means operable to simultaneously connect said source with each of said devices, including a dog on said work support and determinative of the time of operation of said control means.

6. In a milling machine, the combination of a movable work table, a rotatable tool spindle, aspindle train, a transmission for movement of' said table including a plurality of members each shiftable to alter the effect lof said transmission,

and shifting meansv for said members including a plurality of fluid; operable devices respectively for the different of said members, a fluid supply pump driven from said source, a plurality of channels respectively for connecting different of .said devices, to lie actuated by :duid from said pump, valve means, associated with said channels for..-controlling fluid delivery selectively to the one or the other of said devices,

mission driven from' said train for movement of said table and including a plurality of members each shiftable to alter the effect of saidtransmission, a plurality of fluid operable shifting devices respectively for different of said members, a chamber containing fluid under substantial pressure, a plurality of channels respectively for connecting said chamber with different of said devices, valve means associated with said channels for controlling fluid delivery from said chamber selectively to the one or the other of Vsaid devices, a reservoir of fluid, and a pump adapted to supply fluid from said reservoir to said chamber and connected to be operated from said source.

8. In a machine tool the combination of a movable member, a source of power, a train connectible from said source to said member and including an element shiftable for alteringthe effect of said train, .a fluid operable device for shifting said element, an accumulator providing a volume of fluid under substantial pressure and connectible for operation ,of said device, a reservoir, a pump connected -to vbe driven from said power source and connected to deliver fluid to said accumulator, an inlet channel from said reservoir to said pump, a throttle adapted to restrict said inlet channel, and means controlling said throttle in accordance with the volume of uid in said accumulator.

9. In a machine tool the combination of.a rotatable tool spindle, a spindle support, a work support, a transmission including a power source,

a motion interrupting clutch. and said spindle in the order recited, and mechanism for relative bodily movement of said supports including a .fluid operable motor connected with one of said supports, a pump for the actuation of said motor,

a plurality of trains respectively connected with said transmission on opposite sides of said clutch, and means for alternatively connecting the one or the other of said trains to drive said pump.

10. In a machine tool the combination of a plurality of supports and mechanism for relative movement therebetween including a uid operable motor connected with one of said supports, a pump for the actuation of said motor, power connections for said pump including means adjustable for a plurality of pump speeds respectively productive oi' different delivery volumes therefrom, other means adjustable for varying the volume delivered from said pump, and control mechanism for simultaneously adjusting each of said means.

11.In a machine tool the combination of a .plurality of supports, and means for relative movement therebetween including a uid operable motor connected with one of said supports,

a power driven pump connected to drive said motor, means adjustable for altering the delivery volume of said pump, a plurality of fluid operable devicesfor movement of said means in directions to increase and decrease the pump deliveryy volume respectively, a fluid source, and control mechanism for selective connection of said source with the one or the other of said devices.

12. In a machine tool the combination of a. plurality of supports and means for relative movement therebetween including a uid operable motor connected with one of said supports, ay power driven pump connected to drive said motor,

means adjustable to alter the delivery volume of said pump, a. plurality of fluid operable devices for movement of said means in directions to increase and decrease the pump delivery volume respectively, a iiuid source, control mechanism for selective connection of said source with the one or the other of said devices, and power operated means for movement of said control mechanism at a predetermined point in the relative movement of said supports.

13. In a machine tool the combination of 1a movable support and transmission andcontrol mechanism therefor, including a fluid operable motor connected therewith, a pump connected with said motor, a plurality of power connections respectively for fast and slow speed of said pump, whereby to vary the delivery volume thereof, other means adjustable for varying the volume of said pump, a iirst iiuid operable device for simultaneously eiiecting said slow speed connection and adjusting said means to reduce the volume ofsaid pump, a second uld operable device for simultaneously leffecting said fast power connection and adjusting said means to increase the volume of said pump, a uid source, and control mechanism for selective connection of said source to operate the one or the other of said devices.

14. In a m'achine tool the combination oi a plurality of supports and transmission mechanism for relative movement therebetween including a iiuid operable motor connected with one of said supports, a pump connected for actuation of said motor. a power transmission for driving said pumpl including means shiftable for a plurality taneously available to vary the volume of pump delivery.

15. In a machine tool the combination of a work 'support and a toolv support, transmission mechanism connectible for relative movement therebetween including a reverser and a rate changer, iiuid operable shifting devices respectivelyy for said reverser and rate changer, a constantly available sourceof iiuid under pressure, a first valve device for connecting said source with the shifter of said reverser, and a second valve device for connecting said source with the shifter of said rate changer, each of said devices being independently operable.

16. In a machine tool the combination of a power source, transmission mechanism connectible therewith including a clutch for interrupting said transmission and including elements shiftable for altering the effect of said transmission, fluid operable Shifters for movement of said elements, a iiuid pump arranged to be driven fromv said main power source at a point unaiected by said clutch, an accumulator adapted to receive iiuid from said pump, channels for selectively connecting said shifters with said accumulator, and mechanism to control the iiuid delivery from said pump in accordance with the volume of uid in said accumulator.

17. In` a machine tool 'having a tool support and a work support, the combination of transmission and control mechanism for actuatingone of said supports including a reverser shiftable to two positions respectively productive of support movement in diierent directions'and to an intermediate position to stop support movement, iirst and second elements respectively operable to move said reverser to different of said two positions, a third element operable to move; said reverser from either other position to said intermediate position, alternative power connections for said elements, a dog operated trip normally adapted during movement of said support to effect the power connection of said'third element whereby to stop said support, and means associated with said trip and adjustable to cause said trip to eifect a power connection with one of said first or second shifters, whereby to change the direction of movement of said support.

18. In a milling machine having a rotatable spindle, a spindle support and a worl support, the combination of a spindle train including a power source, a motion interrupting clutch and said spindle in the order recited, a transmission for relative movement of said supports and driven from said spindle train, said transmission including a reverser shiftable to diierent positions respectively productive of dierent direcconnect said fluid supply with said elements one at a time and, a dog operated trip for adjustment of said valve means and adapted during relative support'movement to effect the fluid supply connection with the element for said stop position of the reverser.

19. In a machine tool having a rotatable spindle, a spindle support and a work support, the

combination of a spindle train including a power source, a motion interrupting clutch and said` spindle in the order recited, a transmission for relative movement of said supports and, connected to be driven from said spindle train at a point between said clutch and spindle, said trans-v mission including an element shiftable to different positions whereby to alter the effect of said transmission, fluid operable shifting means for said element, means for continuously maintaining a supply of yfluid available for operating said shifting means including a pump and a'drving train for said pump and connected with said spindle train at a point between said power source and clutch and valve means selectively operable for connecting said fluid supply with said shifting means to shift said element to the one or the other of said different positions.

20. In a machine tool having a. rotatable spindle, aspindle support and a work support, the combination of a spindle train including a power source, av motion interrupting clutchand said spindle in the order recited, a. power 'train including a fluid operable motor connected with one of said supports and a pump for the actuation of said motor, a relatively slow feed train driven from said spindle train at a point between said clutch and spindle, a relatively fast quick traverse train driven from said spindle train at a point between said clutch and power source, and means for alternative connection of said fast or slow trains to actuate said pump.

21. In a milling machine the combination of a rotatable tool spindle, a` work support movl able in either direction in a path transverse to the axis of said spindle, a transmission for movement of said support including a reversibly fluid operable motor, a power driven pump selectively operable for any of a variety of relatively low feed rates and for a relatively high quick traverse rate of uid delivery to said motor; and control means for said transmission including a dog operable mechanism for alternatively determining said iluid delivery at one of said variety of feed rates or at said quick traverse rate, a manually operable device adjustable independently of said mechanism for selectively predetermining said one of said variety of feed rates and a plurality of dogs respectively effective to operate said mechanism at intermediate points in different directions of support movement for operation of said mechanism.

22. In a milling machine the combination of a rotatable tool spindle, a work support movable in either direction in a path transverse to the axis of said' spindle.- a transmission for movement of said support including a reversibly uid operable motor, a power driven pump selectively operable for any of a variety of relatively low feed rates and for a relatively high quick traverse rate of fluid delivery to said motor; and control means for said transmission including selectively dog operable mechanism for changing the direction or rate of said fluidA delivery or for interrupting said iluid delivery, a manually operable device adjustable independently -of said mechanism for selectively predetermining one of said variety of feed rates to be effective after subsequent operation of said mechanism to ei'Iecta feed rate of fluid delivery, a dog .operable on said mechanism for effecting said change of direction of uid delivery after said support has been moved in a forward direction, a dog operable on said mechanism 4for changing the rate of'said fluid delivery -at an intermediate point inthe movement of said support in said forward direction whereby to effect said one of said variety of feed rates, and a dog operable on said mechanism for interrupting said iiuid delivery after movement of said support inthe other direction.

23. In a milling machine, the combination of a rotatable tool spindle, a work table movable in a path transverse to the axis of said spindle, a transmission for movement of said table including a fluid operable motor having a plurality of ports, a unidirectional output pump selectively operable for any of a variety of relatively'low feed rates and for a relatively high quick transverse rate of fluid delivery, vsaid pump having an inlet and an outlet port, and channels con- 'nectible for said outlet port of said pump to a power source associated withsaid machine' tool and adapted to be actuated at a substantially constant known number of revolutions per minute, a driven member and a rate changer connected to be driven from said source and connected to drive said member, said rate chang- I erable lever, and lmeans visibly indicating the result of the operation of said manually operable lever.

2 5. In a machine tool, the combination of a work support and a tool support, a transmission yfor actuation of one rof said supports including a power source associated with said machine tool and adapted to be actuated at a substantally constant known number of revolutions per minute, a driven member and a rate changer connected to be driven from said source and connected to drive said member, said rate changer having portions adjustable to a variety of positions productive of corresponding rates of said member, means -for adjusting said rate changer portions comprising a power train connectible with said rate changer portions including a fluid pump driven from said source to exclude said rate changer, a fluid channel connected with said pump, a member connected to operate said portions and to be fluid operated from said channel, valve means shiftable for controlling the passage of fluid through said channel, control means for the connection of said power train with said rate changer portions including a hand operable lever operable for "shifting said valve means, and means visibly tatably supported from said structure, a work table movably supported from said structure, a

. spindle transmission including a power source Cil adapted to be actuated at constant speed and supported from said structure, a spindle rate changer and said spindle in the order recited, a. table transmission including a rate changer driven from said spindle transmission to exclude said spindle rate changer, one of said rate changers being housed within said hollow structure and comprising portions adjustable to a variety of positions productive of corresponding rates, means for adjusting said rate changer portions including a power train driven from said source to exclude both said rate changers and-connectible with said portions, control means for the connection of said power train with said rate changer portions including amanually operable lever, and means exterior to said hollow structure and visibly indicating the result of the operation of said manually operable lever.

27. In a milling machine, the combination of a hollow supporting structure, a tool spindle rotatably supported from said structure, a work table movably supported from said structure, a

spindle transmission including a power source supported from said structure, a spindle rate changer and said spindle in the order recited, a table transmission including a rate changer driven from said spindle transmission to exclude said spindle rate changer, one of said rate changers being housed within said hollowA structure and comprising portions adjustable toa variety of positions productive of corresponding rates, means for adjusting said rate changer portions comprising a power train connectible with said rate changer portions including a fluid pump driven from said source to exclude both said rate changers, a fluid channel and v alve means shiftable for controlling the passage of fluid through said channel, control means for the connection of said power train with said rate changer portions including a hand operable lever connected with said valve means, and means exterior to said hollow structure and visibly indicating the result of the operation of said hand operable lever.

28. In a machine tool, the combination of a work support and a tool support, a transmission for actuation of one of said supports including a power source associated with said machine tool and adapted to be actuated at a substantially constant known number of revolutions per minute, a driven member and a rate changer connected to be driven from said source and connected to drive said member, said rate changer having portions .adjustable to a variety of positions productive of corresponding rates of said member, means for adjusting said rate changer portions comprising a rate selector adjustable to a variety of positions independently of the position of said rate changer portions, aV power train. motion transmitting connections connected with said portions and connectible with said power train and operable to adjust said portions in accordance with the adjustment of said rate selector, a hand operated element controlling the connection' of said power train with said motion transmitting connections, and means visibly indicating the result of the operation of said hand operated element. f

29. In a machine tool, `the combination of a work support and a tool support, atransmission for actuation of one of said supports including a power source associated with said machine tool and adapted to be actuated at a substantially constant known number of revolutions per minute, a driven member and a rate changer connected to be driven from said source and connected to -drive said member, said rate changer having portions adjustable to a variety of positions productive ofr corresponding rates of said `member, means for adjusting said rate changer portions comprising a rate selector adjustable to a varietyv of positions independently of the position of said rate changer portions, a power train including a iiuid pump driven to exclude said rate changer, a fluid operable device operable for movement of said rate changer portions in accordance with the adjustment of 'said rate se-v lector, a iiuid channel connectible between said pump and device, valve means shiftable for controlling the passage of uid through said channel, control means including a hand operable lever for shifting said valve means, and means visibly indicating the result of the operation of said hand lever.

30. In a milling machine, the combination of a hollow supporting structure, a tool spindle rotatablysupported from said structure, a work table movably supported from said structure, a spindle transmission including a power source adapted to be actuated at constant speed and supported from said structure, a spindle rate changer and said spindle in the order recited, a table transmission exclude both said rate changers, motion transmitting connections connected with said portions and connectible with said power train, said motion transmitting connections being operable in accordance with the adjustment of said rate selector, a hand lever operable for controlling the connection of said power train with said motion transmitting'connections, and means exterior to said hollow structure and visibly indicating the result of the operation of said hand lever.

3l. In a milling machine, the combination of a hollow supporting structure, a tool spindle rotatably supported from said structure, a work table movably supported from said structure, a spindle transmission including a power source adapted to be actuated at constant speed and supported from said structure, a spindle rate changer and said spindle in the order recited, a table transmission including a rate changer driven from saidv spindle transmission to exclude said spindle rate changer, one of said rate changers being housed within said hollow structure and comprising portions adjustable to a variety of positions productive of corresponding rates, means for adjusting said rate changer portions comprising a rate selector adjustable to a variety rof positions independently of the position of said rate changer portions, a. power train including a fluid pump driven from said source to exclude both said rate changers, a fluid operable device operable for movement of said rate changer porvisibly indicating the result of the operation of said hand lever.

32. In a milling machine, the combination of a rotatable spindle,'a work table movable relative to said spindle for work movement in a path transverse to the spindle axis, a power train for rotation of said spindle including a power source, a transmission element shiftable into a plurality of positions, and said spindle in the order recited, a table drive mechanism including feed and quick traverse mechanism driven from said source, and control mechanism including a device selectively.v fluid operable for' shifting said transmission element to the one or the other of said positions, a pump driven from said source to exclude said transmission element, fluid channels connectible between said pump and said device, and valve means associated with said channels and controlling said selective operation of.

said device.

33. In a machine tool the combination of a base, a work table supported from said base for horizontal reciprocation, a spindle support supported from said base and uprising at theone side of a vertical plane passing through a longitudinal edge of said table, a tool spindle rotatably supported from said support and axially transverse to the direction of table movement, a spindle transmission including a. power source, a transmission member shiftable for altering the spindle rotation, and said spindle in the order recited, alternatively operable feed and rapid traverse trains for movement ofsaid work table, and' control means for said` spindle transmission comprising a fluid pump supported from said base, and a power train connecting saidpump to be actuated from said spindle transmission at a point between said power source and transmission member, a fluid operable shifter for said member, a channel connectible from said pump to said fluid operable shifter, adjustable valve means associated with said channel, and a lever manually operable for effecting adjustment of said valve means and supported from said base at the other side of said vertical plane.

34. Inl a milling machine, the combination of a transmission including a power source and a member to be actuated thereby, said transmission including means adjustable for determining various rates of actuation of said member relative -to said power source, a device adjustable for preselecting a predetermined value of said relative rates which will be effected upon the subsequent adjustment of said adjustable means, and a secondary power transmission connectible for adjustment of said adjustable means including fluid shiftable piston devices and valve means oper-l able to determine when said piston devices shall be shifted.

35. In a milling machine, the combination of a base, a work support supported from said base for horizontal reciprocation, a rotatable tool support, a structure carrying said tool support and uprising adjacent a longitudinal edge of said work support and at the one side of the vertical plane co-incident with said edge. a transmission connectible for actuation of one of said supports includins a power source and means adjustable for determining various rates of actuation of the support relative to the rate `of said source, a device adjustable for selectively determining one of said various rates, a secondary transmission connectible for adjustment of said adjustable means, and control means for saiddeviceincluding a manually operable portion supported from said base at the other side of said vertical` plane and adjacent the other edge of said work support.

36. In a milling machine, the combination of Y a rotatable tool support, a reciprocable work support, a. transmission for actuation of one of said supports including a power source and means adjustable for establishing a plurality of rates of the actuated support relative to said source, a source of fluid under pressure, adjusting means for said adjustable means and operable from said' uid pressure source, ,manually operable valve means controlling the supply of fluid from said fluid -source for selectively timing the effect thereof on said adjusting means, and a rate indicating device associated with said adjusting means and adjustable means to indicate the rate effected upon operation thereof. 37. In a milling machine, the combination of a rotatably movable tool support, a support bodily movable adjacent said tool support in a direction transverse to the axis thereof, a transmission for one of said movements driven at a substantially constant -rate and operable for a varietyof rates including a fast rate, a relatively slow rate and a plurality of intermediate rates, said transmission including a rate changer adjustable into a variety of different positions collectively productive of all of 'said rates and respectively determinative of different of said rates; and control mechanism for said transmission including a shifter operable to `adjust said rate changer out of any of said positions of lrate changer adjustment into any other thereof, said shifter providing a plurality of oppositely fluid operative pistons each connected for adjustment of said rate changer, a preselective device having various positions respectively determinative upon operation of said shifter of different of said positions of rate changer adjustment and movable independently of the position of adjustment of said rate changer and in advance of said operation of said shifter, a source of fluid under pressure, and manually operable means for the selective connection of said fluid source independently of the position of said preselective device andl alternatively to actuate the one or the other of said pistons, said preselective device includinga chart having markings respectively representing different of said rates,4 and means visibly indicating on said chart the eect of the operation of said control mechanism.

38. In a milling machine, the combination ofy Ia rotatably movable tool support, a support bodily movable adjacent said tool support in a direction transverse to the axis thereof, transmission mechanism for movement of saidsupports including a motion interrupting clutch for said tool support and a rate changer for one of said movements and adjustable into a variety of positions collectively productive of a fast rate. a relatively slow rate and a plurality of intermediate rates; and control mechanism for said transmission including a shifter operable vto adjust said rate changer out of any of said positions and into any other thereof, said shifter providin g a plurality of oppositely fiuid operable pistons each connected for adjustment of said rate changer, a preselective device having variouspositions respectively determinative upon operation of said shifter .of different of-said positions of able means controlling said clutch, and duid com' v2,052,647 nections controlled from said manually operable means for connecting said fluid source to actuate said pistons, said preselective device including a chart having markings respectively representing different of said rates, and means visibly indicating on said chart the eect of the operation of said control mechanism.

' 39. In a milling machine, the combination of a horizontally movable work table, a supporting structure therefor, a rotatably movable tool spindle at a level above said table and axially transverse to the path of table movement, said structure providing a spindle supporting portion uprising adjacent' a longitudinal edge of said table at one side of a vertical plane passing through said edge, a transmission for one of said movements including a rate changer adjustable into a variety of positions vcollectively productive of a fast rate, a relatively slow rate and a plurality of intermediate rates; and control mechanism for said transmission including a shifter operable to adjust said rate changer out of any of said positions of rate changer adjustment into any other thereof, said shifter providing a plurality of oppositely 'fluid operable pistons each connected for adjustment of said rate changer, a preselective device having various positions respectively determinative upon operation of said shifter of different of said positions of rate changer adjustment and operable independently of the position of adjustment of said rate changer in advance of said operationof said shifter, said device including a portion exposed for manual operation at the other side of said vertical plane, a source of fluid under pressure and manually operable means for the selective connection of said fluid source independently of the position of said preselective device and alternatively to actuate the one or the other of said pistons, said preselective device including a chart having markings respectively representing differentA of said rates, and means. visibly indicatingon saidv chart the effect of the operation of said control mechanism.

40. A milling machine including a bed, a tool spindle support carried by the bed having a spindle journaled therein, a work support carried by the bed, and shiftable relative to the spindle, a prime mover, a power transmission including variable speed gearing operatively connecting the prime mover and spindle, means for effecting power movement of the work support including a second variable speed transmission, power means for varying the rate transmitted by one of said variable speed transmissions, an'd a control device on the shiftable member and coupled with said power means for controlling the operation thereof.

41. A milling machine including a columnfa cutter spindle and a work support mounted on the column. a prime mover carried thereby, variable speed connections between the prime mover and the spindle for rotation ofthe spindle, additional. variable speed connections from the prime mover for effecting a relative shifting of the spindle and work support one with respect` to the other, clutch means for determining the operative connection of the feed mechanism and the spindle rotating' mechanism, a single control for jointly determining the operative effect of the clutch mechanism, an independent quick traverse drive transmission in constant operative connection with the prime mover and means for .coupling the quick traverse with the shiftable member when the control member has rendered the other drive connections ineffective.

42. A milling machine including a column, a cutter spindle rotatably supported thereby, a work support supported by the column, feeding means for imparting relative movement to the work support with respect to the spindle, a prime mover, a transmission from the prime mover to the spindle including a clutch and an organized speed variator disposed in serial relation in the transmission, a second transmission deriving power from the ilrst transmission line at a point intermediate the prime mover and clutch whereby said second transmission is unaffected by the clutch, a first branch transmission extending from the second transmission to the feeding means, a second branch transmission extending to the feeding means and including an organized variable speed unit, clutch means alternatively available to couple the first or second branch transmission to the feeding means, a single actuator for simultaneously shifting the spindle drive lclutch and second branch transmission clutch in the inoperative position and additional means for shifting the rst branch transmission clutch for operative coupling of the first branch transmission and feeding means when the second branch transmission is disconnected therefrom.

43. In a milling machine, the combination of a bodily movable work support, a rotatably movable tool support, a transmission for one of said movements including a motion interrupter and a plurality of members each shiftable to alter the effect of said transmission, a plurality of fluid operable shifting devices respectively for different of said members, a chamber containing fluid under substantial pressure, a plurality of channels respectively for connecting said chamber with different rof said devices, valve means associated with said channels for controlling fluid delivery from said chamber selectively to the one or the other of said devices, a reservoir of fluid, and a pump driven from said transmission to exclude said motion interrupter and adapted to'supply fluid from said reservoir to said chamber.

44. `In a. machine tool the combination of a power source, transmission mechanism connectible therewith including a clutch for interrupting said transmission and including elements shiftable for altering the eilect of said transmission,

fluid operable Shifters for movement of said elemission including anelement shiftable to different positions whereby to alter the effect of said transmission, fluid operable shifting means for said element, means for continuously maintaining a supply of fluid available for operating said shifting means including a pump and a driving train for said pump connected with said spindle train at a point between said power source and clutch and valve means selectively operable for connecting said fluid supply with said shifting means to shift said element to the one or the other of said ditl'erent positions.

46. A milling machine having a work table, a

frame member supporting the work table for movement, a prime mover mounted on said frame member, means for coupling the prime mover to the table for actuation at variable feed and rapid traverse rates, a feed-rapid traverse device selectively shii'table to connect the table for the one or the other rate, iluid operable means i'or shifting said device, a table reverser device, fluid operable means for shifting said reverser device, means actuated by said prime mover for supplying pressure to the device shifting means, control valves for the diil'erent device shifting means, and trip mechanism in operative relation to the table for automatically positioning both of said control valves.

47. In a milling machine the Icombination with a movable support o! power actuated transmission means for moving said support including a fluid actuated rate determining device and a fluid actuated direction determining device, fluid pressure means for said devices, an independently operable control valve for each device, and a common control member for both valves.

48. A milling machine having a rotatable cutter spindle and a reciprocable work table, power actuated means including a motion interrupting clutch for rotating the spindle, power actuated means including a trip plunger for reciprocating the table transversely of the spindle, a common prime mover for said power actuated means, power operated means including a control member Ior shifting said clutch, means operatively connecting the control menib'er to the trip plunger, and means carried by the table for shifting said plunger to determine simultaneously the rate of movement of the table and rotation loi' said spindle in accordance with said rate.

49. A milling machine having ayrotatable cutter spindle and a reciprocable work table, a spindle transmission including almotion interruptingy clutch, a-table transmission-for effecting movement of the table transversely of the spindle, a common prime mover for the table vand spindle transmissions, a uid operable device ior shifting said clutch, a source of pressure, a valvelor determining the ilow of pressure to said device, trp controlled mechanism effective -upon the transmission for determining movement oi' the cEs'rrFIcATEcF CORRECTION.

Patent No. 2,052,647.

rate changer and power driven means operable 4 to adjust said rate changer in accordance with the preselected adjustment of said rate selector, and control means disposed to'control the operation of said power driven adjusting means in manner 'to selectively eil'ect adjustment of said rate changer to cause said relative movement to occur at the preselected one of.said rates.

51. A machine tool including a frame, a tool spindle rotatably supported by said frame, a work support carried by said frame in manner to be movable relative to said tool spindle, a source of power -associated with said machine tool, a power transmission mechanism operatively connecting said source of power to said tool spindle in manner to rotate said spindle, means ior effecting power movement of said work support including a variable speed transmission mechanism, power operated means arranged to adjust said variable speed transmission mechanism to vary the rate of movement eected thereby, and a control device carried by said movable work support and operatively connected to control the operavariable speed Ipower transmission mechanism operativelygconnecting said source of power to said work support, power means operatively connected in manner to adjust said variable speed transmission mechanism to vary the rate of shifting of said work support, and a control device disposed to be operated by movement of said shiftable work support and operatively associated with said rate adjusting power means in manner to y control the operation thereof.

-' A. PARSONS.

September 1 1936-.

FRED A. PARSONS'.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Page 6, first column, line 68, claim 3, for the word "devices" read elements; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 5rd day of November, A. D. 1956.