US2595438A

US2595438A - Paper drilling machine or the like

Info

Publication number: US2595438A
Application number: US52019A
Authority: US
Inventors: Adrian Joseph
Original assignee: SUPER SPEED PRINTING MACHINERY
Current assignee: SUPER SPEED PRINTING MACHINERY; SUPER SPEED PRINTING MACHINERY Inc
Priority date: 1948-09-30
Filing date: 1948-09-30
Publication date: 1952-05-06
Anticipated expiration: 1969-05-06

Description

May 6, 1952 J ADRlAN 2,595,438

PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 30, 1948 4 Sheets-Sheet l INVENTOR.

BY LAM m ATZ'K May 6, 1952 J. ADRIAN 2,595,438

PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 50, 1948 4 Sheets-Sheet 2 (g eam! IN V EN TOR.

Y AW UA v0 ATTYJ.

y 1952 J. ADRIAN PAPER DRILLING MACHINE OR THE LIKE 4 Sheets-Sheei 3 Filed Sept. 50, 1948 INVENTOR.

KAMJ/ FOlA mwvu y 6, 1952 J. ADRIAN 2,395,438

' PAPER DRILLING MACHINE OR THE LIKE Filed Sept. 30, 1948 '4 Sheets-Sheet 4 IN VEN T OR.

I08 BY E 2 A ATTY5 Patented May 6, 1952 UNITED STATES PATENT OFFICE PAPER DRILLING MACHINE OR THE LIKE Joseph Adrian, Cleveland, Ohio, assignor to Super Speed Printing Machinery, Inc., Cleveland, Ohio, a corporation of Ohio Application September 30, 1948, Serial No. 52,019

9 Claims.

This invention relates to power operated drilling machines, and more particularly to power operated paper drilling machines that are used for drilling holes through stacks of paper sheets.

In power operated paper drilling machines, a head that rotatably supports a spindle to which a hollow drill is connected is movable in a vertical direction toward and from a table on which the work is supported; and it is the primary purpose of my invention to simplify the construction and lower the cost of machines of this kind by incorporating, in the head of the machine, not only the mechanism for, operating the drill spindle, as heretofore, but also the means for moving the head toward the table in order to force the drill through the work. Thus, all working parts of the machine (excepting a pedal that is used in the present embodiment of the invention for initiating each cycle of operation) are capable of being incorporated in an assembly that terminates at its lower end in a base immediately adjacent the table of the machine, and which assembly is mounted on a stand or cabinet of suitable height.

Another object of the invention is to operate the means for moving the head of the machine toward the table by the same prime mover that drives the drill spindle, and, preferably, to transmit the power from the prime mover to said means through the intervention of the spindle. The obvious advantage in such an arrangement is that, in case the rotation of the drill is obstructed, the operation of the head moving means will be simultaneously arrested thereby to relieve parts of the machine from undue strain or breakage.

Another object is to incorporate hydraulic means in the head of the machine for depressing the head." Another and related object is to make the head of the machine of such form that it will provide a leak-proof reservoir for the liquid used in the hydraulic means, and tolocate all parts of said means and the connections through which they communicate inside the reservoir so that in case any leak occurs in said parts or connections the escaping liquid will be confined to the reservoir.

Another object is to provide operative connections between the pedal (located adjacent the bottom of the stand or cabinet) and the operating means (situated in the head of the machine) that will yield readily to the vertical movements of the head and will remain operative at all times notwithstanding the variable spacing between th pedal and the head.

A further object of the invention is to incorporate eilicient, smoothly operating and durable hydraulic means in the head of a machine of the class aforesaid for depressing the head, and that includes a safety feature for protecting the drill or other parts of the machine against breakage or injury under abnormal operating conditions.

An additional object related to the immediately foregoing one is to provide actuating mechanism for the hydraulic means which may be instantly released at any point in the descent of the head thereby to stop such descent and permit the re turn of the head to normal position.

A still further object is to provide an actuator valve for the hydraulic means that is of very sturdy construction, and that is thoroughly reli-'- able.

The actuator valve above refered to comprises a tubular stem having relief ports, and a valve memler in the form of a sleeve that is slidable along the stem to cov, r and uncover the ports; and it is a further 0 ect of the invention to provide means for equalizing the fluid pressure exerted on the interior of the sleeve throughout the circumference and length thereof so as to insure freedom of movement of the sleeve upon the stem. By virtue of this means, and in furtherance of the same end, a film of oil is maintained throughout the area between the sleeve and stem, imparting to the sleeve a sort of floating action.

Another object is to provide dependable trip mechanism for the actuator valve, including an adjustable stop that is especially convenient of manipulation, for causing the valve to operate so as to stop the hydraulic means when the head has descended far enough to insure projection of the drill through the work, but with minimum penertration of the drill block.

The foregoing objects, with others that will" appear as this description proceeds, are attained in the embodiment of the invention illustrated in the accompanying drawings, wherein like reference characters designate like parts in the several views; and while I shall describe said embodiment in detail, I wish it to be understod that the omitted; Fig. 3 is a sectional plan view of the head of the machine, the plane of section being indicated by the line 33 of Fig. 4; Fig. 4 is a side elevational view in the immediate vicinity of the head of the machine, the head being partly in section, as indicated by the line 4-4 of Fig. 3; Fig. 5 is'an. enlarged .transverse vertical section through the head of the machine. on the line 55 of Fig. 3; Fig. 6 is a vertical section through the actuator valve of the hydraulic means, the

section being on the line 6-6.. of Fig. 5, and Fig. 7 is an enlarged 'fragmentary view-of the valve stem in the region of the escape .ports..thereof l is a stand or cabinet that.;is.desirably con-- structed of sheet metal reinforced by structural.

elements in accordance with. commonpractice.

The front of the cabinet is closed partwaydown" from its upper end by a panel 2, and suitably,

supported within the cabinet, for convenient removaltherefrom, is .a sol-called chip.box.3 that is provided with a frontaplate ithat closes the front ofzthe-cabinetbelow.thepanel 2 to within a. suitflange: l2. surroundsrthe top. of the cabinet, and. secured. thereto, by fastening means. [3, are the.

front arm [4 and lateral arms l5 of a base designated. generally by the. reference. numeral. 29. Risingfrom therean of. the; base. atthe. transverseecenterthereof, andhaving its lower end.

rigidly secured to. the base, is a-.cylindrical.c.olumn.-22', shownas tubular? A.-table:24 is. suitably fastened to. the, base .20

and overlies. the, front portion .of. the. stand. or, cabinet -I.- and. projects a distancebeyond eachv side andthefront thereof. Removably contained within an opening in. the .table 2.4. is the usual circular'drillyblock 21, the opening, being so re.- latedtdthe-drill that the latter engages .theblock. eccentricallythereof. Surmounting,thetableand clampedthereto. isthecustomary back. gauge 38, and-:along; .one; end. portion. thereofis adjustable aside gauge 3| 3.5. designates, generally, the, machine. head; This-head desirably consistsof acasting having a-bottom wall-and sidewalls3l andl38. The rear end of the head. is. formed by a relatively large vertical sleeve-All which isislidable upon the before-mentioned column22. At their. forward ends, theside walls3l and..38.converge. and join asmaller. vertical sleeve. 42. Anti-friction bearings 43'and'44- are shown as seated withincounterbores in theupperand lower ends ofthe sleeve 42. and rotatably support the. drill spindle .45 axially of said sleeve.. Grooved pulleys. 4? and 48. are fastened to thedrillspindleabove the hearing 43. As .iscustomary inpaper drilling machines, thelower. end of the spindle has a hollow enlargementifi,provided withone or more side openings, oneof. which is. shown. at 5| in Fig. 4. Below saidlenlargement. is the usual drill chuck 53 forv connecting a hollow drill to the spindle. Sucha drillis shown in Figsl and 2, where it is designated. H6. The bore of the chuck opens into the hollow enlargement 59 so that chips from the drill may ascend into said enlargement and be discharged therefrom by centrifugal force through the opening or openings 5| into an annular chamber of a chip housing 55. This housing has a spout-like rearward extension 56 by which the chips are directed into a jointed chip chute 51 (Fig. 1) that leads downwardly through an openingin the table24anddrops the chips into the chip box. 3..

Shown as integral with the head 35, and as located at about the transverse center thereof. immediately in front of the sleeve 40, is a cylinder casing 60, thebore of which opens through the.top.of. thecasing- Operating within the bore of .the. cylinder.v casing is a piston 62 that may consist-of a-.solidbar of metal that is reduced in diameter at its upper end to provide a stud 83.

denotes a beam having a portion that extendsdiametrically through the column 22 ad" jacent the upper end of the latter, said portion being provided with cylindrical parts that. fit tightly Within apertures of the. column to "rigidly connect the beam to thecolumn. The rectangular front end portion'of the beam 85 hasa vertical bore thatis.'occupiedby'the aforesaid stud B3 ofithe. piston. A pin 68 is shown as projected through a transverse hole in theupper end of thestud 63 to lock'thebeamand piston together.

Forwardly of thebore'that receives-the stud 63,v

the'beam 65 is 'provided with' avertical, threaded aperture Within which an adjustingscrew' I0 0perates; thescrew'beingprovided with aknob 1| atits upper end: A threaded-,axial recessopens through thelower end ofthe' adjusting-screw into which. is screwed the threadediupp er end of" atrip rodll'3; Alock nut Hon said trip'rod engages;the endoftheadjusting screw'to bind the parts togetherwhen.onceproperly adjusted. The

lower;end oftherod13carriesa trip; stop 15. To

oppose; rotation ofjthe adjusting screw H3- and thus hold it against turning as'a resultof vibration ofithe'machine'orother. accidental cause, I

employ means including a friction block 11, of'

fiber or thelike, which occupies a bore 18 that opens through the front of. the beam, 65-and into the'threaded aperture that is occupied bythe screwlll'; Saidiblockis'forced" against the screw by a spring, 19" thatis compressed between said blockand aplugBO'that isthreaded into the front end'ofthebore I81, The'trip'rod 13 passes freely P through a hole in a lug that extends forwardly from'theupper. end of thecylinder casing 60 and supports a cusliion ,86 which, in the present instance; consists ofia washer; of shock absorbing material, such as leather or rubber, that surroundsthe triprod.

A relatively stiff helical spring 88. surrounds the column 22 and iscompressed between the base ZUandthe. bottom of. the head 35. This so-called return spring, tends to hold the head in ele-' vated;position,,with the cushion 86 engaged with the nut".

A passage 90 extends-laterally from the bottom of the 'boreof' the cylindercasing' 60 through a thickened part 36 of' the bottom wall of the machine head; and communicating therewith is the tubular stem 9'! of an actuator valve, designated generally by the reference numeral 92. The lower end of said stem is threadedly connected to the part 36% and into'the lower end of the bore of'the valve stem is screwed a plug 94 having an axial aperture for a purpose presently to appear. The valve stem has an enlargement 95 about midway between itsends, and intermediate said enlargement in the lower end of the stem, the

" latter is provided with radial relief ports 96. 91

is'a sleeve-like valve member that is slidably fitted to the stem, and it is normally held in elevated position against the enlargement 95 by a spring 98 that surrounds the lower end of the stem and is compressed between the valve member and the part 36*. To insure freedom of movement of the valve member along the stem, the stem is provided with a series of circumferential grooves 99 that extend a distance above and below and through the zone of the relief ports 96, the character of the grooves best appearing from the enlarged detail of Fig. 7. The presence of these grooves causes a film of oil to be maintained between the adjacent surfaces of the valve member and stem, imparting to said member a sort of floating action as it moves along the stem, and moreover the grooves eifect an equalization of pressure of the liquid against the inner surface of the valve member circumferentially and lengthwise of the member. Experience has shown that, in the absence of the grooves, the outward pressure of the liquid on the inner surface of the valve member, when the latter covers the relief ports 96, distorts the valve member enough to result in the latters binding on the stem. The factors contributing to this condi- 7 side of said arm IOI and a boss I06 that projects from the side wall 31 a distance below the notch I02. This spring surrounds a pull wire I08 that has its upper end locked within a hole in the arm IOI'by a set screw I09, while the lower end of said pull wire I08 is connected at II 0 (Fig. l) to the previously mentioned pedal I0. Enclosing all but the end portions of the pull wire is a flexible casing II2, which has its upper end extended through an aperture of the boss I 06, wherein it is locked by a set screw I I4, and its lower end fastened in a bracket II 5 that is attached to a' part of the stand or cabinet I directly above the connection between the lower end of the pull wir and pedal, by a bolt II6. I A relatively short rock shaft I20 is pivoted intermediate its ends in an 'apertured lug- IZI of the sleeve I00, that is substantially opposite the arm IOI. Fastened within a transverse bore of th'eshaft I20 by a set screw I22, rearwardly of the lug I2I, is the upper end of a trip rod I 23, the lower end of which is arranged for engagement with the top of the valve member 91, as best shown in Fig. 5. Similarly connected to the front end of the shaft I20, by a set screw I25, is a trip arm I26. Its endremote from the shaft I20 is turned down and disposed in the path of the beforementioned trip stop 15 on the lower end of the rod 13. A spring I28 is coiled about the shaft I20, forwardly of the lug I2I, and has one ofits ends hooked about said lug, as shown in Figs 3 and 5, and its opposite end hooked over the trip arm I26, as shown in theaforesaid views, as well as in Fig. 4. This spring is so disposed as to rock the assembly including the trip arm I26, shaft I20, and trip rod I23 in a direction to depress the outer end ofsaid arm and to hold the lower end 6 of the trip rod toward the stem 9| of the actuator valve 92.

Referring particularly to Figs. 3 and 4, I30 de-s notes a pump, desirably of the gear type,.that is

walls

31 and 38, and are fastened to said lugs byscrews I40. The pump bracket and parts sustained thereby are omitted from Fig. 5 in order to avoid confusion. Thepulley I 31 is in the horizontal plane of the previously mentioned pulley 48 that is fastened to the top of the drill spindle 45, and an endless belt I42 extends about said pulleys.

Connected to the inlet side of the pump I30, through an elbow fitting I45, is a pipe I46 that depends to within a suitable distance of the bottom wall 36 of the machine head 35 (Fig. 4). A T fitting I41 has its lateral branch connected to the outlet of the pump and its cross branch arranged in a vertical position. The upper end of said cross branch communicates, through a, pipe I5, with the previously mentioned fitting I03 that is connected to the upper end of the valve stem 6!. A conventional pressure-relief valve I52 is connected to the lower end of the cross branch of the T fitting I01 and includes a valve closing spring pre-loaded to a given pressure, as will be readily understood by those acquainted with this class of article.

A prime mover in the form of an electric motor I55 is supported by the head 35 through the medium of brackets J56. Said brackets include studs I51 that extend forwardly through bores in lugs I50, shown as integral with and extending laterally from the rear end of the head 35. The" studs I51 are adapted to be secured in any position of adjustment within the lugs I58 by set screws I59. shaft I60 vertical, and attached to. the shaft directly above the casing of the motor is a flywheel I6I, and disposed above the fly wheel and fixed with respect to the shaft is a pulley I62. An endless belt I63 is engaged about the pulley I62 and about the previously mentioned .pulley 41 that is fastened to the drill spindle 45. Obviously, the tension of the belt I63 may be changed by shifting the motor through the adjustment of its supporting brackets I56.

To prevent leakage or seepage about the piston 62, the wall of the cylinder bore is formed with annular grooves I65 and I66. disposed in suitably spaced relation to each other and to the top of the cylinder casing; and a so-called O-ring I61 (an item well known in the art) occupies the groove I65 and is contracted, through its own resiliency, about the piston 62, and a wiper ring I68 of felt or the like occupies the groove I66.

As a result of the manufacturing method ems ployed, an opening I10, produced by a core sup-'- port, opens through the bottom of the head 35; in line with the bore of the cylinder casing 60,"

and this is permanently closed by a'sealed-in plug I1I and similarly, a plug I12 permanently closes the outer end of the passage 90. A drain opening for the reservoir constituted of the head 35 is closed by a removable screw plug I13.

The motor I55 is arranged with its A section-a1. cover-may, if desired, be applied to the open top of the machine head 35,such a cover beingindicat'ed-in broken lines in Figs. 4

5, where the cover. is designated I I4.

Themotor' I55, with'a switch I15, is included in-an' electric circuit (not shown) In the present instance, said switch is carried by thepanel 2 and is located'beneath thc'right hand side of the table where it is inconvenient reach of the operator.

'Ahollow drill I'Ifi (Figs. 1 and 2) is connected, bymeans of the chuck 53, to the lower end of the spindle 45; Irll is the usual stripper plate, carried'by the lower end of a rod I'ii that is recipro'cable in the bore of a vertical boss I19, shown. as an integral part of the head 35. A helical spring mil-surrounds the rod I18 and is compressed between the stripper plate and the bottom of the boss I19, all of this being in accordance with common practice.

A: guard I 85, shown only in Fig. 1, anddesirably fabricated of sheet metal, covers the machine head*"and encloses the motor I55 and the column 22".

To condition the machine for use, the reservoir provided by the head- 35 is filled with oil or other suitable liquid to-approximately the depth indicated at X in Figs. land 5.

The machine is set in operation by closing the switch" I15 thereby to supply current to'the motor 155. With' the motor in operation, the drill spindle-" will be rotated through the driving connections constituted of the pulleys ll and I52 and the belt I53. With the drill spindle rotatingsimiiar motion will be transmitted to the drive shaft I35 of the pump I30 through the pulleys 43 and I3? and the belt M2. Operation of the pump I39 will set up a circulation of liquid .from the reservoir inwardly through the pipe M5, through the pump, and thence through the pipe I to the valve stem BI. With the valve memher' 9'! held in elevated position by the spring 93, the liquid will escape through the relief ports 96 to the reservoir, it being understood, of course,

that under the present conditions a quiescent bodyof liquid occupies the lower portion of the bore of the valve stem, the passage 93, and the bore of the cylinder casing 69.

With a stack of paper sheets positioned on the table 24 for drilling, and the stripper plate IT! 0 held firmly in engagement therewith by the spring I80, the operator initiates a drilling cycle by depressing thepedal I0. When the pedal is depressed it draws the pull wire I03 downwardly and, with it, the sleeve I30. This movement of the sleeve is transmitted to the valve member 9? through the trip rod I23. When the valve member is-lowered in oppositionto the spring 98 it closes the relief ports 96 and causes the liquid from the pump to pass downwardly the length of the valve stem and through the orifice of the plug 94 and thence through the passage 9-3 to the cylinder bore. Acting against the stationary piston 62, the accumulating liquid under pump pressure forces the head 35 downwardly so as to project the rotating drill I16 through the stack of paper sheets on the table 24. In a normal cycle of operation the head will continue to deso-end until the drill has penetrated the bottom sheet, at which instant the trip rod I23 will be withdrawn from the upper end of the valve member 31 due to engagement of the trip arm I26 with the stop I5. Thereupon, the spring 93 will lift the valve member 31 above the ports 96, permitting the liquid from the pump, as well as that from: the bore of the cylinder casing 60., torescape tothe reservoir. Under these conditions, the spring 88 returns the-head. 35 to elevated position. However, the-flow of liquid from thebore of'the cylinder casing is-retarded by therestricted orifice of the plug 94, thereby to control. the return speed of the head and enable its upward movement to be arrested by engagement. of the cushion 86- with the nut I4, without shock.

If, for any reason, the operator desires-to stop the drilling operation before the drill has com pleted its work, he may do so by releasing the pedal I0. This allows the spring I05 to return the valve tripping mechanism to initial position, and permits the valve member 91 to be lifted. by thespring 98 so as to uncover the relief. ports 96.

In case the drill becomes stuck so as to'sto'p rotation of the drill. spindle, thepump will also be stopped inasmuch as it is driven by said spindle, and further depression of-the head will be prevented. Under these conditions the operator may immediately open the motor circuit at the switch I15. Again, should the descent of the head be obstructed from any cause, undue liquid pressure is prevented from building up in the system by the opening of the relief valve I52.

Having thus described my invention, what I claim is:

1. In a machine of the class described, characterized by an assembly comprising a base, a work supporting table, and guide means fixed to the base and rising therefrom a substantial distance above the plane of the table; a head sustained by said guide means above the table for movement toward and from the latter. biasing means for elevating the head and tending to retain the head in elevated position, power means incorporated in the head for depressing the head and including a piston and a cylinder of which one is connected to saidguidemeans and the other to the head, the cylinder having an open end through which thepiston extends and the piston having a single working face exposed to the interior of the cylinder, a pump also included in said power means for delivering fluid pressure to said. cylinder, means operable at will forcontrolling the delivery of said-fluid, a prime mover mountedon the head thatisin continual operation while the machine isin use, and constantly effective driving connections between the prime mover and the pump.

2. In a machine of the class described, characterized by a base, a work supporting table, and guide means fixed to the base and rising therefrom a substantial distance above the plane of the table; a head sustained by said guide means above the table for movement toward and from the latter, biasing means for elevating the head and tending to retain the head in elevated position, hydraulic means incorporated in the head and including a piston connected at its upper end to the said guide means in parallel relation thereto, an open end cylinder incorporated in the head and wherein said piston operates, the piston having a single working face exposed to the intericr of the cylinder, the head being constructed to provide a reservoir for liquid, a pump carried by the head and having its inlet in communication with the liquid space of said reservoir, communicative connections between the outlet of the pump and said cylinder, a valve in said communicative connections which, when open, permits the escape of the liquid from said communicative connections to the reservoir, means biasing said valve toward open position, manual- 9 1y operated means for closing said valve, a prime mover mounted on the head, and driving connections through which the prime mover operates said pump.

3. In a machine of the class described, characterized by a base, a work supporting table, and guide means fixed to the base and rising therefrom a substantialdistance above the plane of the table, a head sustained by said guide means above the table for movement toward and from the latter, biasing means for elevating the head and tending to retain the head in elevated position, the head being constructed to provide a liquid reservoir, a cylinder incorporated in the head having its axis parallel to the path of movementv of the head and opening through the top of the head, a piston within the cylinder having a part extending above the latter, a beam connecting said part of the piston rigidly to said guide means, the piston having a single working .face exposed to the interior of the cylinder, a pump carried by the head and having its inlet in communication with the liquid space of the reservoir, communicative connections between the outlet of the pump and the cylinder, a valve in said communicative connections which, when open, permits the escape of liquid from said connections to the reservoir, means biasing the valve 'to open position, manually operated means for I closing the valve, trip mechanism for rendering saidmanually' operated means ineffective when the head reaches the bottom of its stroke, aprime mover mounted on the head, and driving connections through which said prime mover operates the pump.

4. In a machine of the class described, characterized by abase, a work supporting table, and guide means fixed to the base and rising therefrom a substantial distance above the plane of the table; a head sustained by said guide means above the table for-movement toward and from the latter, biasing means for elevating the head and tending to retain the head in elevated position, a source of liquid supply in the head, a piston and a cylinder of which one is connected to said guide means, and the other to the head and so arranged as to depress the head when liquid under pressure is supplied to the cylinder, the cylinder having an open end through which the piston extends and the piston having a single working face exposed to the interior of the cylinder, a pump carried by the head and having its inlet in communicative connection with the liquid supply, communicative connections between the outlet of the pump and the cylinder, a valve in said connections which, when open, permits the escape of liquid from said communicative connections to said source of liquid supply, means biasing the valve to open position, manual means for closing the valve, trip mechanism for rendering the manual means ineffective when the head reaches the bottom of its stroke, said mechanism including a stop disposed in a given relation to the guide means, and a trip arm movable with the head for engagement with said stop, a prime mover mounted on the head, and driving connections through which said prime mover operates the pump.

5. In a machine of the class described, characterized by a base, a work supporting table, and guide means fixed to the base and rising therefrom a substantial distancse above the plane of the table; a head sustained by said guide means above the table for movement toward and from the latter, biasing means for elevating the head and tending to retain the head in elevated posi- .10 tion, a ,piston and a cylinder of which one is connected to said guide means and the other to the head and so arranged as to depress the head when liquidunder pressure is supplied to the cylinder, an actuator valve including a tubular stem having a relief port intermediate its ends, and a sleeve-like valve member reciprocable on said stem between a first position in which it uncovers said relief port and a second position wherein it overlies and closes the relief port, the head being formed to provide a liquid reservoir, a pump carried by the head and having its inlet in communication with the liquid space of the reservoir, communicative connections between the outlet of the pump and the cylinder and including the aforesaid valve stem, the relief port of said valve being arranged to discharge into the reservoir, means tending to move the valve member to the aforesaid first position, manually operated means for moving the member to secend position, a prime mover mounted on the head, and driving connections through which i said prime mover operates the pump.

6. In a machine of the class described, characterized by a base, a work supporting table, and

.guide means fixed to the base and rising therefrom a substantial distance above the plane of the table; a head sustained by said guide means above the table for movement toward and from the latter, biasing means for elevating the head and tending to retain the head in elevated position, a piston and a cylinder of which one is connected to said guide means and the other to the head and so arranged as to depress the head when liquid under pressure is supplied to the cylinder, an actuator valve including a tubular stem having a relief port intermediate its ends, and a sleeve-like valve member reciprocable onsaid stem between a first position in which it uncovers said port and a second position wherein itoverlies and closes the port, the head being formed to provide a liquid reservoir, a pump carried by the head and having its inlet in communication with the liquid space of the reservoir, communicative connections between the outlet of the pump and the cylinder and including the aforesaid valve stem, said relief port being arranged to discharge into the reservoir, means tending to move the valve member to the aforesaid first position, and manually operated means for moving the member to second position, the valve stem being arranged substantially parallel to the path of movement of the head, and said manually operated means including an element movable longitudinally of the valve stem, a rocking structure having pivotal connection with said element and including a trip rod for engagement with the valve member so as to impart thereto the movement of said element, said rocking structure also incorporating a trip arm that extends laterally from said element, a stop in fixed relation to the guide means for engagement by said trip arm when the head reaches the bottom of its stroke, a prime niover mounted on the head, and driving connections through which said prime mover operates pump.

'7. In a machine of the class described, a head, stationary guide means by which the head is supported for reciprocation in a vertical direction, biasing means for elevating the head and tending to retain the head in elevated position, hydraulic means incorporated in the head for depressing it, a liquid supply carried by the head, a pump supported by the head and having its inlet in communication with said liquid supply, communicative connections between the outlet of,the:pump andsaidliydrauIlc means, a valve in said connections which, when open, permits return of the liquid .to the liquid supply and, when-closed, diverts the liquid to said hydraulic means, means biasing the valve to open position, meansfor closing the valve, trip mechanism for effecting the opening of the valve, said mechanism being movable with the head and including atrlp arm, a stop adjustable with respect to said guide :means for limiting the upward movement of the head, and'a secondstop in fixed relation to'the'first mentioned stop and adjustable therewith, thesecond stop being arranged for engagement by said 'trip'arm when the head arrives at the bottom of its stroke, aprime mover, and driving connections between the prime mover and 8: In amachine of the class described, a head, stationary guide means by which the head is supported for reciprocation'in a vertical direction, biasing means for elevating the head and tending to retain the head in elevated position, hydraulic means incorporatedin the head for depressing it, a liquid supply carried by the head, apump'supported by the headand having its inlet in communication with said liquid supply, communicative connections between the outlet of the pump and said hydraulic means, a valve in'said connections which, when open, permits return ofthe liquid to the liquid supply and, when closed, diverts the liquid to said hydraulic means, means biasing the valve to open position, means 'for closing the valve, trip mechanism for efiecting the opening of the valve, said mechanism being movable with thehead and including a "trip arm,-a partof the stationary guide means having a threaded aperture, a screw adjustable therein and-incorporating a stop for limiting the upward movement of the head, a'second stop carried by the screw in fixed relation to the former stop and arranged for engagement by said trip arm when the head arrives at the bottom of its stroke, holding meanslin .the aforesaid part frictionally engaging the screw, a prime mover, and driving connections between the prime mover and the pump.

9. In a machine of the classdescribed, a base, a work supporting table, guide means rising from the base a substantial distance above the plane of the table, a head sustained by said guide means for movement toward and from the table, power means incorporated in the head for moving the latter, anactuator carried by the head for controlling the operation of said power means, an operating member located in a given position relative to the base, and constantly efiective operative connections between said operating member and the actuatorthat yield to the relative movement between the head and base.

" JOSEPH ADRIAN.

REFERENCES CITED The following references are of record in. the file of this patent;

UNITED STATES PATENTS Number Name Date 613 041 Kamerer Oct. 25, 1898 1,223,741 Schwister Apr. 24, 1917 1,331,960 Johnson Feb. 24, 1920 1,353,244 Joerns Sept. 21, 1920 2,023,842 Kingsbury Dec. 10, 1935 2,072,481 McNairy Mar. 2,' 1937 2,170 702 Wardwell, Jr Aug. 22, 1939 2 178,364 Svenson Oct. 31, 1939 2,254,708 Nye Sept. 2, 1941 2,260,327 McKee Oct. 28, 1941 2,356,046 Garlick Aug. 15, 1944 2,363,255 Lee et a1. NOV. 21, 1944 2,374,774 Olsen May 1, 1945 2,475,304 Bariffi n, July 5, 1949 2,496,431 Bertonneau Feb. 7, 19