US2458976A - Multiple power application device - Google Patents

Description

Jan. 11, 1949. R.E..cA|\/1PBE1 VI 2,453,976

MULTIPLE POWER APPLICATION DEVICE u INVENTOR. Kou/Aff, (WN/BHL Ff;A f'

Jan. 11. 1949. R. E. CAMPBELL `MULIPLE POWER APPLICATION DEVIC 2 sheets-sheet 2 Filed April n 4, 1944 www 4. a0/7.

Patented Jan. 11, 1949 UNITED STATES PATENT yOFFICE Rollin E. Campbell, Anderson, Ind.

Application April 4, 1944, Serial No. 529,531

I 1 This invention relates to a multiple power Vapplication device suitable for many purposes. One of such is in moving in the pressing art, see patent No. 1,890,341, the movable headtoward the buck and then applying pressing pressure therebetween which last mentioned pressure is 'then increased.

Since this invention is lcapable of use in `many fields vof activity, no specific application is illustrated herein, butl for purposes of understanding this invention,'it is tobe understood same includes two relatively movable members, same befing `normally constrained to one position4 and pressure movable to another position, see said patent aforesaid. Y

The'chief object of this invention iste provide a pressure operable power device capable o 'functioning as aforesaid. f I

One chief feature of this invention resides in the dual cylinder and dual piston arrangement with dual pressure applications thereto in predetermined sequence whereby multiplev `power effect is obtained.

- Another chief feature of this invention resides in the cushioning action obtainable `at the ends of the stroke in the relative movement of parts.

A further feature of the invention `resides in the automatic lubrication provided when desired.

Still a further feature of the invention resides in its reduction of possible points ofv failure or faulty operation in one form thereof as hereinafter pointed out.

Other objects and featuresof the invention will be set forth more fully hereinafter in' con- `nection with the detailed description to follow. f

The full nature of the invention will-be understood from the accompanying drawings "and the 'following description and claims:

In the drawings- "Fig, 1 is a central sectional view of one embodiment of the invention including' 'theautomatic lubricator, partsbeing illustrated in the collapsed or fully telescoped position.

Fig. 2 is a similar view of the invention,`the lubricator being omitted andthe parts illustrated being 'shown in an intermediate extended position.

Fig; 3 is a view similar to` Fig. 2 but with `-the parts'in the fully extended position. 1

Fig. 4 is a' view similar to Figs.Y 2 and 3but with aparts in a positionfintermediate between that shown in Figs. 2 and 3, andshowing the beginning of the 'returnstroke I Fig. 5 is a top plan view of the 'invention illus- 6` Claims. (Cl. ,60-97) vtrate'd in the right' half of Figs. 2 to 4 inclusive and a transverse sectional view of said parts and taken in a plane above the Ilarger piston.v

- Herein heads I0 and Mare clampingly connected Fig. 6 is a View similar to Fig. 3 and-of a modied formA of the inventionv e Fig. 7 is a View similar to Fig. 2 and of a'further modified formof the invention;r

Figs. 8 and9 are sectional views vof the lubricator shown in Fig.Y 1 and are taken respectively on lines 8-8 and 9-9 on said gure and inthe direction of the arrows.

In Figs. l to 4 ofthe drawings Ill'indicates a cylinder head having an outward-extension YI I vby which one end of the device may be mounted. This head is apertured'at I2 for connection!) to a source of pressure, land in certain 'forms'of the invention this maybe directly exposed to the atmosphere, f

Secured vto head Iiscylinder I3 to'whichfis suitably secured the opposite cylinder head 'I 4.

together, with the cylinder I344 therebetween by rods I5 and nuts I6,"see Fig. 5. 4

Extending into cylinder I3 and centrally from 'I head Il) is the tapered extension I1. Tl'iisv is coaxially chambered as atIB and said chamber or bore has restricted communication with thecylinder as by collar I9 which has bore 20 therethrough. VAny suitable rigid connection williser've. Slidable in the bore l2l! isrod 2 I andthe bore terminating end thereof in-chamber I8is1'enlarged as Vat'22. A spring 23a envelopes therod v2Iiaru1d at opposite ends bears upon enlargement or head 22 andr collarIS and. normally tendsito constrain rod 2I to its retractedv position as shown vin Figs. 23.11413. .'H'L

Slidable within cylinder I3 is a piston structure including the body 23` upon which is mountedfby annular plate or washer 24 and bolts 25;the leather. v26 or its equivalent. Extending* toward head I0 is the tubular eXtensionZl Aof the tubular pistonf rod 28, the latter immediately adjacent the pistonstructure including therein slots'ZQ "of predetermined length. y 'W 1 When these partsfare' positioned as in Fig. 1, pressure fluid applied at I 2 enters tubular exten- 'sion 21 since it does not seal upon*v the frustofa constraint, such as a'springg'not =`shown', which 3 constantly urges said piston structure toward that end.

The other end of tubular piston rod 28 is closed as at 28a and rigid therewith is portion 30 connected to a member to -be moved, such as a garment press head support. The closed end 28a of rod 28 is apertured at 3| and same is adapted to be connected to a pressure supply controlled by a control, cut-off and release valve arrangement not shown.' In action pressure iluid, when the valve is open in one position, is applied to the interior of piston rod 28. When the valve is closed, that pressure is held therein. When the valve is moved to another open position-itmaintains the pressure supply in cut-off relation and opens the previously pressure supplied interior of rod-29 to the atmosphere. e It, I

Such air pressure supply, holding and releasing is conventional to the garment pressart, Yand which also utilizes a return power spring or ,springsythe spring mentioned. hereinbefore and not shown. c 1.

The cylinder head Yf4 herein includes an outwardly projecting portion `32 which includes bore 33 that slidably supports rod 28. .For sealing purposes gasket 34 and gland nut 35 or its equivalent may be provided. The bore 33 communicates `with cylinder I3 by the conical enlargement 35.

Carried byt-he upper end of -rod 2| and within tubular rod ,28 which serves as a cylinder are a pair of opposed piston structureshaving a predetermined spaced relation.4 The lower piston structure includes leather SIand opposed vplates 38 and 39, the former bearing upon shoulder 49 of rod 2| near the upper end thereof.

A spacing sleeve 4 I` at'one end bears upon plate 39 and its opposite end bears-upon plate 42 of the other piston structure. The latter includes opposed-leathers 43 andV 44k and upon them bears i ,plate45. All'of the aforesaid is retained upon'the rod 2Ibythe lock washer 4B and nut 41, threaded y upon the-threaded upper end of said rod.

Included in an offset portion`48, 'see Figy as ,welles Figsl to 4, is-,aborc 49 having restricted communication with cylinder' I3 by port 50, the

adjacent kend of the bore forming valve seat 5I. A'valve 52 in Abore 49'- has astem 53 slidable in said port and engageableA by the large piston near ,theQend of fitsupwardvstroke. tThis unseats the i-yalyeand permits cylinder I 3. v4,tonto vent to bore 49. v 5 `A4 'valve guide andspring retainer is'f member 54, that slidably supports stem 55 alsocarried by .yalve. concentric with said stem isa springv 5 v,gt-hat has one end bearing upon mem-ber54 'and its opposite end bearing upon valve 52. Valve 52 is thus constrained to seated position'and piston`unseatedforventing to the atmosphere. Nte'that the length of sleeve 4I is sucient to space the two smaller piston structures atopposite ends of slots:`

29 in tubular'piston'rod-cylinder 28 thus'sealing on both ends of this cylinder from -theported portion when member 28 is in the-position shown in Fig. 3.

' y "Operation ,QfAs previously recited, member 28 has been brought back to the'po'sition shown` in Fig. lby a spring power not shown hereinand at this time vent-,valve 52 is held closed by spring 56 and no air.,V pressure,` etc.,- isv applied at13li-v However, pressure applied-at I2 andl isimposedsimulta- ,neously on opposite` sides ofi-fthe larger piston. l Application of `pressure f to `intake ,-3 l -,gi'eai;er v lin amount than applied-@31.2, ceusesfrodftvlinder ,28

above the large pisf to elevate. Since slots 29 are exposed, the pressure from I2 is substantially in balance, and the :Huid in cylinder I 3 readily transfers from one side of the large piston to the other in the elevation of said piston. It will be observed that the initial pressure applied to intake 3l and imposed on the upper small piston lowers rod 2l in opposition to pressure from I2 admitted beneath piston 3l through .parts 29. As long as pressure is held or applied to the upper end of the smaller piston structurasame will be held in lowered position provided other forces be not applied or become effective.

fWhen the device is stationary the air pressure at I2 constantly presses against the lower face of piston 31 compressing spring 23a forcing rod 2l upward `until member 22 operatively bears against the collar I9 through compressed spring 23a. The rod and spring are maintained in this position until air pressure is admitted at port 3l. The pressure vfrom port 3l tends to balance the pressure from intake l2 thereby permitting spring 23a to force rod 2i down untill member 22 strikesl the bottom of bore I8. The rod and piston structure now remains in this position until theairv pressure is exhausted at port 3I at which time this rod and inner piston structure is again forced'up by the pressure at intake I2.

At a predetermined part of the upward travel of cylinder 28 the larger piston engages stem 53 of the vent valve 52 to open same. The result is' that, since by this time the lower smaller piston has cut 01T ports 29, pressure from I2 Iapplied to the lower face of the piston is now unopposed or unbalanced so that pressureA from I2 becomes eiective for raising piston cylinder 28 as the air above the larger piston 23 vents at 50 as the latter elevates. Hence; so far as extension 30 is concerned, it may be said to be rst elevated by pressure applied at 3l and then elevated by pressure applied at I2.

Since the large piston is appreciably greater in area than the smaller piston structures, the totalforce exerted near the end of the relative movement, depending upon what the pressure c value is at I2, is quite large. Hence, in this relative movement, as in a garment press, one pres- `sureyis ilrstutilized for relative positioning a pressing member, as a head, and then the second pressure can be used for exerting pressing pressure on the buck, or following initial pressing the additionalfpressure can be utilized for additional pressing pressure as desired. The foregoing is recited merely as illustrative of one type of-utilization of this invention.

v'I'c release the device,"the pressure applied at 3I--isreleased. This results in pressure from I2,

applied tothe. lower face of the lower smaller piston raising piston rod 2I against spring 23a. This changes the blocking or sealing oi relation- `ship theretofore existing between cylinder 2B and thesmaller pistons, for now ports 29 are exposed -to the pressure applied at I2,` thus attempting to equalize the pressure at opposite sides of the larger'piston so that the larger may be started u down by its return spring (not shown) and/or gravity against the action of fluid pressure thereon until vent valve 52 closes. The return spring (not shown) and/orgravity is then relatively unopposed and the larger piston and cylinder 28 Ythen return to the position shown-in Fig. 1;

`Whenever it is desired to produce a snubbing or cushioning at either end of the stroke, or at both ends, same is accomplishedfas follows: If the ventingat 50 is suitably'throttled, the

desired upper snubbing or cushioning action is obtained, dependent upon the degree of throttling imposed. Such additional throttlingvalve ,isvso obvious, an illustration thereof isnintentionally omitted. l l

Whenever throttling or cushioning at the other end of the stroke is desired, the taper of projection I1 is such as to elfect the desired cushioning or snubbing. Obviously each arrangement is never of cut-01T type, or .otherwise the. device will not function as hereinbeforedescribed.

In Fig. 6 there is illustr-ated a` modifedform of the invention. Herein thelventing ofthepressure above the larger piston, instead ofv ,being mechanically released by piston vent valve control, is released by exposing vents 80 to atmosphere.. These vents are in the cylinder-piston rod 8| andthe upper and lower smaller pistons 82 and 83 are appreciably spaced apart by elongated sleeve 84, all being carried lby rod 85 as shown. A z 1 Positioned between these pistons is suitable absorbent material 86 utilized forretention vofany surplus lubricant from exhausting 4to thelatmosphere. It also has a tendency. to silencev the,

exhaust. y. l

The operation of this form of the invention is substantially the sameasthat previously 1described relative to the form of the invention illustrated in Figs. 1 to 5, except as modified as hereinbefore specified. 1 l l v,

In Fig. '1 a more complicated yform and further modification of the invention is illustrated. Herein 81 indicates the larger cylinder, 88 the larger piston, 89 the smaller cylinder and piston rod, 90 the smaller piston carried by rod 9|, 92 the intake. etc., to the cylinder 89, and 93 the constant pressure intake.

Herein cylinder head 94 includes vent port 95 with which is associated spring closed vent valve v96. This head includes the elongated bore 91 in which cylinder 89 is slidable, the bore being suitably sealed at its outer end as at 98. Communicating with this bore is the Alateral passage 99 including valve port leading to the interior of cylinder 99. A valve |0| is normally closed by a spring and opens only when pressure uid is forced through it from passage |08.

Head |02 includes the constant'pressure intake 93, passage |03 terminating in valve seat |04 and lateral passage |05 have port |06 controlled by spring loaded valve |01. Conduit |08 completes the bypass between lateral passages 99 and |05.

Herein piston 88 includes a tapered tubular extension |08a. merging with cylinder 89 for cooperation with bore 91 as hereinafter pointed out. Also the lower end of rod 9| mounts valve |09 which is slidable thereon and constrained by spring ||0. Fixture carried by head |02 cooperates therewith. i

Operation is substantially las previously described except that instead of interior bypassing with slots in the piston rod-cylinder, herein bypassing is externally accomplished by the use of three additional valves. This form of the invention has the disadvantage that extra Valves, etc., are required, same introducing possible sources of failure.

When pressure is applied at 92, valve |09 is initially closed, and then piston 88 and cylinder 99 is elevated. As same elevates, pressure above piston 88 increases opening check valve |01 for pressure equalization upon opposite sides of piston 88. This main piston elevation continues 6 until extension |08a enters bore 91 andseals oil same. Valves |01 and |09 being closed and with vent valve 96 open,.thefpressure in the bypass releases through port |00 and hence the pressure .above piston 88 is released.

Whenfthis occurs, the pressurer on piston 88 from intake. 93 becomes effective for further movement of rod cylinder 89 and piston 88 until the end of the stroke. `When return movement is desired, pressureat 92 is released and valve |09v opens. This equalizes pressure upon opposite sides of piston 88 and permits the outside constraint to return the piston 88 to its lowered position. When pressure is again applied at 92, valve |09 is closed and piston 88 is elevated initially bysaid pressure supply until equalizing bypassing` is terminated,A whereupon, as before, pressure vfrom intake 93 upon piston 88 completes the Astroke of rod-cylinder 89. y

A Reference will nowbe had to Figs. l, 8 and 9..wherein an automatic lubricating feature is fully disclosed. Therein indicates a supply pipe from a regulated sourceof pressure. Pipe |20 isv tapped into a head |2| and freely communicateswith bore |224 therein. Bore |22 has restricted communication as at |23 with an aligned bore |24 connected to line |25 in turn connected to the constant pressure intake such 'as intake I2l in` Figs. 1 to 4, intake 19 in Fig. 6 and intake 9,3 rin Fig. .7. Leading downwardly from bore |22 is `passage |25, see Fig. l.` Depending from the head |2| is projection |21 through which extendsthe passage |28.y Thisv terminates in charnb'er. |29 in said head and said chamber has communication with bore |24 as at |29a. This is controlled by needle valve |30, adjustably carried by said head as at |3| and includes regulating arm |32.

A detachable cup |33 has its upper end engaged with seat |34 on the lower face of the head. A

lyoke |35 has bearing |36 that engages the lower end of the bowl or cup and screw |31 has threaded engagement with the upper end of said yoke and bears upon the upper face of said head |2| thereby clampingly securing the cup and head together.

This cup is filled to the `desired elevation with lubricating oil. The oil is forced up through passage |28 due to the pressure applied to the surface of the oil in the cup.

The needle valve |30 regulates the flow. When closed, no oil is supplied. This oil lubricates the larger piston and cylinder and the smaller cylinder and piston cooperating surfaces.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The sever-al modifications described herein as well as others which will readily suggest Ythemselves to persons skilled in this art, all are consi'dered to be within the broad scope of the invention, reference being had to the appended claims.

The invention claimed is:

1. A pressure operated device comprising a main cylinder, an annular main piston therein having a hollow piston rod projecting out of one end of the main cylinder, the projecting end of the hollow rod being closed to form a small cylinder, a relatively stationary small piston in the small cylinder, means for selectively controlling the applic-ation of fluid under pressure to the small cylinder between its projecting closed end and the small piston, means for continuously ap'-Y plying fluid under pressure to' the'main piston at the side thereof opposite the piston rod, a normally open bypass passage for uid flow between opposite sides of the main piston, a normally closed vent passage for the rod 'end o f the main cylinder, and means responsive to apredetermined movement of the main piston following the admission of fluid under pressure'to the small cylinder for opening the vent passage and closing the bypass passage, whereby the pressure at the rod side of the main piston is vented andy the pressure at its other side is eiective tocause continued movement of the main pistoniandlits connected small cylinder. v

2. A pressure operable device as defined by claim 1 wherein there is provided an ejector type operable lubricantI supply means, included in the main cylinder continuous pressure applying means, and the small cylinder is provided with vent ports arranged for free discharge nwhen the latter is appreciably projected, the'small piston being of dual, axially spaced, piston type, and lubricant trapping means between themsmallpiston spaced portions andl adapted for exhaust silencing purposes. i

3. A pressure operable device as defined by claim 1 wherein there is provided valve means carried by and responsive to movement of the small piston, movement thereof being responsive to -ilui'd pressure application to the small cylinder. n y y 4. A pressure operable device as defined Vby claim 1, wherein thesma-ll cylinder includesports in the main piston end thereof, and small piston controlled'to vent the adjacent'end of the main cylinder upon predetermined relative movement of the small cylinder with respect to its piston.

5. A device asde'ned by claim 1 whereinthe venting means comprises a normally closed vent valve, and means extending into the main cylinder and operable'by the main pistonv in its movement for opening the valve.

6. A' device as dened by claim lvvherein the smaller 'cylinder includes a normally opened bypass opening into the main cylinder 'immediately adjacent the main piston. f

i ROLLIN E. `CAMPBELL.

lRinriimilvcits CITED Thefollowing references are ,of record `in Vthe file of this patent:

UNITED STATES PATENTS Number y Name ,I l 'Date 1,430,359 CaniOn Sept. 26, 1922 v,1,552,768 snnth sept. 8, 1925 1,653,750 Van Hamersveld Dec. 27, 1927 1,782,741 Norgren Nov. 25, 1930 1,890,341 Y Singiser v Dec, 1932 1,965,106 McDougall July 3, 1934 '2,170,851 Carroll Aug. 29, 1939 2,293,334 Ernst Aug. 18,1942 2,304,644 Heftler Dec. 8, 1942 2,335,917 ,Ciltlilieift.1 Dec. 7, 1943

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