US2391187A - Hydraulic arbor press - Google Patents

Description

:fr l Wag-25, E y@ 8- Dec. 18, 1945. l E; PAGE 2,391,187

HYDRAULIC ARBOR PRESS Filed July 5, l943f '4 Sheets-Sheet 1 86 7 Z8 v rn. FI

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HYDRAULI C ARBOR PRE S S Filed Ju-ly 5,:1943 4 sheets-sheet s fj Q 5 ao Y -30 Y y /az 6 v f 72. '75- l.- I y K mlllk /30 /06 95v 9? ,u T N l mam .74 n A 73a .0: O A

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` H. E. PAGE HYDRAULIC ARBOR PRESS Filed July'5, 1943 4 Sheets-Sheerl 4 y 2&5. 7

Patented Dec. 18, 1945 lSl'lli'l' ES PATENT OFFICE HYDRAULIC amaca, PRESS,

Herbert E. Page, Pasadena, Cali f-. Application July 5, 194e,y serial No. roasts 9- claims. (o1. moi-'11).

This invention has to do with hydraulic presses, amore particular adaptation being as. an arbor press..

Q'ne of the major features of my invention is its provision ci novel. means for obtaining quick contact off the ram with the work.y This initial contact is, accomplishedeither mechanically or hydr"a'ulicja-lly,V by a simple, compact mechanism. Afterv contact is; made, my ram-actuating element is automatically converted from aA quick contact establishing mechanism to a vpressure multiplying mechanism which exerts the requisite pressure onthe ram to accomplish its Work.

` Another feature of my invention resides in the 'provision oa single manually operated' member for establishing quick contact of the ram withthe work and for thereafter exerting the hydraulic, working pressure, thus eliminating the multiplicity `of controls usually necessary for the ful-l operation of conventional arbor presses.

Another object of my invention is the provision VVoli a safety clutch incombination with pressure release means to prevent injury which might re- Sult from return movementI of the ram mechanismbeing transmitted' to the manual control member, as well as to render it possibleA to disengage the operatingrneans to maintain a xed hydraulic pressureyon the ram when desired.

An additional object of-'fthe invention isthe elimination of external pumps and valvessuch as are usually present in Such devices, by-providA 'ing a `sellconijiained hydraulic ram carriage.

Another feature of my inventionisthe proe vision of an auxiliary left-handV controlwhich may be used when itis desired tor free the right handy of the operator forsomer other purpose.

Still further advantages are inherent in my inventionand how those as well as the objects hereinabove particularly mentioned are 'achieved Y willbe best understood from the following de'- tailed explanation vof av presently preferred embodi'rnent, for which purpose I shall referto the accompanying drawings in which:

Fig. y1 is a front elevation;

Fig. 2 `is an enlarged topyplan view;

Fig. 3 is 'an enlarged fragmentary vviront elevation; Y y

Fig. 4k is 'anfenlarged fragmentary view taken on line 44 of Fig. 1;

Fig'. v5 lis an enlarged fragmentary section 'taken on line 5 5 of Fig. 3;

Fig. 6 is an 'enlarged cross section taken on line 6*-76 of Fig. 3; K y

Fig. 'I is an enlarged cross section takenA on line 1-1 of Fig. 3;

8 is an enlarged tragrnentary view taken on line 8*-8 Qf. 1;, Eig.Ay 9, is, a fragmentary vertical section taken on line 9-9 of Fig. 6; and

Eis.. 10 is an enlarged fragmentary elevation of the lower end portion of a valve-operating shaft.` y

Referring. now t0, the drawings, I show the supporting frame of. my Press as. Consisting 0f. uprights 5 which may be anclfioredY to the floor 4 by angle iron brackets'. |The hydraulic ram cargriage L is disposed between companion cross plates a secured to the frame by bolts 9- carrying spacer sleeves Ela, Horizontal plates Ill! Il are secured to the cross rrrembers` 8` by bolts I2. The lower Plate H. has'. medial Opening. "aio pass the carriage, bearing surfaces being provided4 for the carriage by blgks. Hb carried by plate. v v

A work-holding bed I5 is, raised and lowered onthe frame bymeanscf cables I6 which are windable4 at one end aboutwindlass l1, extending'over' sheaves I8 on the frame and connected at their other ends to the bed. The bed is retained at the desired working height by means of pins 2Q extending intoA selected 01,165 of the :drilled holes, in `the frame uprishts- Work W is Shown. ,supported Qfrrthe bed. by Supporting blQCkS Bi The carriage 1 consists of a body 25 having vertical cylinder bores 26, 21 and a hydraulic fluid reservoir 28. A pumping piston 2-9 is reciprocally mounted in the cylinder 26 and is secured Aat itsftop end to a rack 30 by screw means 3l.

A rel'ativelylarge worl; piston 33 is reciprocall'y mounted in cylinder 21 and is stationarily secured at its top end to plate |50 by screw 33a, so that piston 3.3, remains stationary While the body 25r moves up and down through -plate ll relative to the piston. In the lower end of the bodyV there a counter bore 50 in the housing 36 Within which a plug 5I fis threadedly secured. The iny ner end of the plug has opening `53 providing a ySeat .for a ball valve 55 controlling passageY of fluid between cylinder 26 and cylinder 21 and normally preventing escape of uid from cylinder 21, there being a body passageway 21a providing communication between cylinder 21 and a transverse opening through plug 5| communicating with the hollow interior of the plug. A spring 56 normally urges valve 55 against its seat. Access to the valve housing is provided by a removable plate 58 carried by the body 25. Packing rings 59 are provided between the valve housing 36 and the body and packing rings 60 are also provided between the plug 5| and the valve housing. The bottom end of the body presents a nose or ram member 65.

A pair of spaced parallel posts extend upwardly from plate |0 and a horizontal top plate 12 is supported atop the posts, the plate being secured in the position by bolts 14, 14a. Posts 10 are held in spaced relation by bolts 13 and spacers 13a. A shaft 15 is journaled for rotation in posts 10 and carries between the posts a pinion 16 whose teeth mesh with the teeth in the rack 30. Collars 11 are secured on the shaft 15 at the sides of the posts 10.

Shaft 15 is journaled adjacent its right end in a housing 80 secured to plate 12 by bolt 8|, and a bevel gear 84 is secured on the right end of the shaft. The left end of the shaft 15 is journaled in another housing member 86 carried by top plate 12 and another bevel gear 85 is secured on the left end of the shaft.

A capstan 90 is operatively connected to shaft 15 by bevel gears 92, 93, shaft 94, clutch 95, shaft 04a and bevel gear 96, the latter meshing with gear 84, so that oscillation or rotation of the capstan moves the piston 29 by means of the pinion 16 and rack 30.

The clutch 95 consists of a collar |00 slidably but non-rotatably secured on shaft 94a, having an annular recess IDI and a toothed bottom end |02, and a collar |03 secured on the top end of shaft 94 and presenting a lateral clutch pin |04 engageable between teeth provided by the bottom end |02 of the collar |00. A bifurcated lever |06 is pivotally secured between its ends to a bracket |01 supported on the frame and has on its bifurcated outer end trunnions |08 projecting into the recess |0|. A spring |06a connected to lever |06 and an arm on bracket |01 urges the clutch collar |00 downwardly into position engaging collar |03.

A foot pedal ||0 is pivotally connected at one end to one of the frame uprights 5 and isoperatively connected adjacent its free end to the` lever |06 by rod l|| and link ||2. The free end of lever l0 is normally urged upwardly by spring ||5, but the pedal may be set in adjusted position by'a stepped stop member ||6 carried by the frame. A spring ||6d urges pedal ||0 towards the uprights to retain the pedal in engagement with the stop member.

Referring again to the hydraulic unit 1, Within vertical bore 38 I rotatably dispose a shaft 20 whose upper end is secured in a collar |20a journaled in plate I0 and whose tubular intermediate portion |200 is rotatably disposed longitudinally in bore 38. A rod |20b of square cross section has its bottom end engaging in a squared socket in collar |20a. Secured in the lower end of the shaft portion |20a there is a round solid member |20d (Fig. 10) which has four longitudinal slots |20e to pass hydraulic fluid from the reservoir. On lthe bottom end of member |20d there is a reduced diameter portion |20f oiset from the longitudinal axis and a Cam 12| iS r0- tatably mounted on portion |20f. The projecting lower end of shaft portion |20f is journaled in a reduced portion of bore 38. When the shaft is rotated, cam |2| engages and pushes the stem 40a inwardly to first unseat poppet 40, and further rotative movement of the cam causes stem 40h to engage and unseat ball 55. The top end portion of rod |201) is of round cross section and is journaled to top plate 12.

Operation of the clutch 95 and the cam |2| is as follows: In the position in which the parts are illustrated in the various views of the drawings, the clutch is engaged and cam |2| is out of engagement with the valve stem 40a, so that the device is ready to commence operation of the.

plunger 29 to move the ram into contact with the work. After the pressing operation has been completed and it is desired to release the pressure from the cylinders, the foot pedal I0 is pressed downward and engaged below one of the stop shoulders ||6a or ||6b of stop member ||6. This movement pulls rod downwardly, fulcruming lever |06 about its pivotal connection to bracket |01 to lift the clutch collar |00 into disengaging position. That movement simultaneously swings post |30, which is carried by and projects upwardly from lever |06, to the left (Fig. 4), causing its carried cross pin |3| to engage and swing the triangular plate |32 about its pivotal connection |33 to the top plate 12. A link I 34 is pivotally connected at |36 to a crank |31 secured to the rod |205 and thus such movement of the foot pedal causes rotation of the shaft |20 to move the cam into engagement with the valve stem 40a. A spring |38 is connected at one end to the crank |31 and at its other end to the top plate 12 so that it normally urges the crank into the position shown in Fig. 2. in which position the cam I2| is out of engagement with the valve stem 40a.

The hydraulic unit 1 is normally urged upwardly into the position of Fig. 3 by means of a pair of coil springs |40 connected at their top ends to the top plate 12 and connected at their bottom ends to the respective arms |42 carried by the body 25. l

It will be observed that the Work piston 33, being secured to plate |0, remains stationary While the body 25 of the hydraulic unit moves relative thereto. Thus, for the purpose of admitting hydraulic fluid into the cylinder 21 below the piston as the ram is initially moved relatively rapidly into contact with work in the manner to be hereinafter explained, I provide in the body a valve housing |50 secured in a corresponding bore in the body by means of a snap ring |5|, and communicating with that bore I provide a passageway |52 which communicates with the reservoir 28. The valve housing |50 has a longitudinal bore closed at one end by a threaded plug |54 and has a transverse opening |55 communicating with cylinder 21. A poppet valve |58 is urged against its seat by coil spring |59 to normally close the reduced opening extending between passageway |52 and the interior of the valve housing. Thus as the body 25 initially moves downwardly relative to the piston 33, the vacuum created in the cylinder 21 unseats poppet |58 and draws fluid from the reservoir into cyl-

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