Патент USA US2118098код для вставки
May 24, 1938. P. v. J. MERENDA PRESS Filed‘ Nov. 9, 1956 f 62 / 54 74 /J * I 2,118,098 Patented May 24, 1938 2,118,098 UNITED STATES PATENT _OFFICE 2,118,098 ` PRESS _ Paul V. J. Merenda, Fontenay-aux-Roses, France, assignor to The Turner Tanning Machinery Company, Portland, Maine, a corporation of Maine Application November 9, 1936, Serial No. 109,824 , In Germany November 29, 1935 ' ` (Cl. 121-38) 5 Claims. 4 This invention relates to presses and is illus cave upper surface for the reception of a con trated as embodied in a press particularly adapt ed to smooth-plating and embossing operations vexly rounded portion of a vplaten member 8 hav ing formed integrally therewith a platen -III upon hides, skins and leather. It is to be under- ' adapted to co-operate with an upper stationary 5 stood, however, that the invention and various im portant features thereof may have other appli platen I2 carried by a head I4. Below the large cylinder 4v is a smaller cylinder I6V having a cyl cations and uses. inderchamber I8 which communicates with the r ' 'I'he present invention is an improvement upon he press disclosed in United States Letters Pat 1 ,ent No. 1,932,556, granted October 31, 1933, upon chamber 5 of the cylinder >4. Movable in the cylinder I6 is a smaller piston 20 having extend ing _completely therethrough a bore 24, the upper application of P. V. J. Merenda. It is an object of this invention to facilitate portion of the bore being restricted in size toV form , 10 and expedite the return of the platen and platen operating pistons toward their lower or initial positions in a press of the type disclosed in the 2D has a surface ~portion around the vent 26 which is machined nat and contacts `a similar ilat surface on the lower end of the large piston 6. Hence the vent 26 is normally closed while the 15 said patent. ' ' - a vent 26. As shown, the upper end of the piston To these ends, and in accordance with an im press is at rest and during all of the time that portant feature of the invention, the movable the pistons 6 and 20 are rising toward pressure platen of a press is arranged to be operated by a \ applying position and also during all the time 20 large piston and by a smaller piston which not that pressure is being applied to a given piece -. only'moves the large piston during upward move of work. In addition, the upper end of the piston 20 ment of both pistons and controls the application 20 has an annular surface 21 against which pres of pressure by the pressure medium to the larger sure may be exerted in a downward direction by piston, as in the-patented construction, but will the pressure medium to move this piston down 25 also pr`ovide by its construction for release of wardly when pressure is removed in thechamber pressure' below the large piston and also the actual I8 to cause opening of the press. Extending lat 25. discharge of the pressuremedium from the cham erally from the bore 24 of the small piston 20 are , ' ber below the large piston, thus facilitating and ports 28, these ports serving a purpose which expediting the return of the large piston and of will later be explained herein. , 30 the platen carried therebyjto their'initial or lower Opening into the chamber 5 of the cylinder4 positions. For this purpose the small piston is is a pipe 30 leading to a‘valve box 32` in which is 30 provided with a bore or'other passageway which a valve 34 normally held in closed position by a extends in line with its axis the full length of the spring 36, the latter being engaged with a disk small piston, the result being that the pressure member 38 rigidly secured to stem 40 which car 35 medium below the large piston may escape ries the valve 34. As shown, this stem 40 of the through. the passageway „thus afforded in the valve 34 extends through the valve box 32 a sub 35 small piston, this operation taking place prompt stantial distance in an upward direction so that ly upon release of pressure in the'cylinder back said valve may be controlled by a lever 42 pivoted of the small piston through the opening of a valve at 44 to the upper end of a link 46 in an arrange 40 under control of the operator. ment wherein the free end of the lever 42 is piv These and other features of construction and otally received within a socket 48 carried by a 40 novel combinations of parts will now be pointed bracket 5U secured to the upper end of the large out- ìn detail in the specification yand then pointed piston 6. It will be readily understood that as out more particularly in the appended claims. ’ the large piston descends from its uppermost po sition, shown in Fig. 1, the lever 42 is operated to Fig. 1 is a front view, partly in section, of the cause depression of the stem 40 and Vits valve 34 .45 whereby the pressure medium (e. g. water or oil) essential elements of a press illustrating one em Within the cylinder chamber 5 may readily escape bodiment of the invention; and Fig. 2 is a sectional view illustrating another through the pipe 30 and through a second pipe species of the invention. i In the illustrated press, which is` specially de signed for smooth-plating and embossing opera tions upon hides, skins and leather, there is pro ` vided a cylinder 4 having a chamber 5 for the re ception of a relatively large piston 6 having _a con 52 to a reservoir (not shown). Opening into the chamber I8 of the lower cyl- 2 inder I6 is a pipe 54 `through which the pressure medium may be introduced into the cylinder I6 . or removed therefrom. , In that species of the invention'shown in Fig. 2, a small piston 60 has a chamber 62 somewhat 55 2,118,098 larger than the corresponding chamber 24 of the piston 28.A However, the chamber 82 lhas a vent 84 at its upper end similar in all respects to the vent 28 leading from the chamber 24 in the pis ton 28. Moreover,ïpiston 88 has an annular sur face 85 _for the same purpose as the correspond' `ing surface 21 on piston 28~ (Fig. 1). 'I'he lower end of the piston 88, in Fig. 2, is screw threaded interiorly to receive a closure inember> 88 which is provided with a number of `ports 68. 'As shown the closure member 88 has also _an opening cen tral therethroughY for- the slidable reception of a rod 18 having an enlarged head 12 which oper ates as a stop to limit upward movement of the 15 small piston 88... Conveniently 'the rod 18 is ex tended through the lower end wall 14 of the small cylinder I8 and is provided with' a nut 18 -adjustably screwed thereon and operative to hold chamber 5 which, acting on the surface 21, forces, the ‘small piston 28'downwardly. /It fol lows that to the vent 28 is opened upon the instant that» the piston 28 starts to descend relatively to the piston 8. Hence the pressure medium may escape through the vent 28 and through the bore 24 of the small piston 28. _ In this way and bythe special construction of the small piston, the return of the large piston to ward its lower position is substantially expedited. >Normally the piston 28 _continues to descend' faster 7than the large piston 8, it being understood in this connection that, unlike piston i8, there is no packing about the piston 28, the latter having a snug running nt in the cylinder I8. However, piston 8 also descends and soon causes opening of the valve at 34 through the operation of the lever 42, thus adding another exit for the pres- » the rod 18 at a predetermined position within sure medium in the chamber 5. and particularly of the controller member and piston, it follows that the range of thicknesses 'valves vwhich enable the operator to control the of the pieces of work to be treated must _be known ` ' _ _ Since the~ports 28 in the piston y28\occupy a the cylinder I8. ' _ v For a'more detaileddescription of this press, _ predetermined position in the length of the said press, reference should be hadl to said Patent No. 1,932,5_56.j _ ' _ ' _ _ and adhered to, it being obvious that apiece o! work thicker than this said range- of thicknesses, .In` the operation of .the press shown in Fig.1, would prevent the ports 28 reaching operative the pressure medium (usually oil -or water) is positionand hence the desired heavy pressure could not be applied within any reasonable time through the pressure medium ’in the chamber introduced' into the cylinder I8 through‘thepipe 54 under pressurel by a pump (not shown) upon proper.v ma'nipulatior'i- of a control member for a valve, also notl shown. ~While thelpl'ess was at rest, the lower end ofthe piston l28 was main tained above the level of the opening of the rpipe 8_4 _by a spring device indicated ät 88“,- the 'arrangement being such that the large piston 8 rested upon the upper end of the small piston 28. Hence, when the pressure Ymedium is introduced under pressure into the chamber I8, the small piston is forcedupwardly carrying _with it the 20 5. For this reason there has been provided an 30 other construction oi’ the small piston, namely, that shown in Fig.v 2, wherein the ports 84 and 88, become eiïective to transmit pressure to the pressure medium inl the large- chamber 5 when the small piston 68 is held from moving upward 35 ly beyond a certain predetermined point by the head-12 of the rod 18. In this case the pressure medium passes through the ports 88 through the bore 812 .and vent 84 to the chamber 5 whereby' heavy pressure is applied to the piston 8, it be-4 40 large piston 8, there'being no escape of the pres sure mediumthrough the vent 28 which is closed _ ing possible to make very readily any desired through the contacting surfaces on the pistons 8 ` and 28, as already described. During upward movement of the pistons 28y and 8, the pressure medium is drawn into the chamber 8 of the large adjustment _or the rod 18, by proper manipula tion of the nut 18, and hence of the position ofy the small piston at'which pressure will be applied to the large piston 8. In fact, the de 45 sired adjustment may be made with the press in cylinder 4 fromaI reservoir (not shown) . through the pipes 8l and 52, since the valve 34 is open _ operation. It will be understood that vsmallpis during practically all 'of the upward movement ton 88 is stopped by head 12 ofrod 18 just at the of the large pistón‘8. Atthe beginning of the ' instant the piece of work on the platen I8 con pressure applying operation upon a piece oi' work tacts- the platen I2 and before application of pres between th'e platens- I8 and I2, the ports 28 in the sure to the work piece. Hence the pressure me-` piston 28 come into place above the floor ci the chamber .5 so that the pressure, -which up- to this dium may be forced through the vent 484 whereby _ due to the very much increased area,-that of the that of chamber I8, since the vent 84 is uncovered 60 when the piston,8 and platen I8 are in their up pressure is applied in the chamber 8 to large time has been con?ned to the chamber I8' of the _, piston 8. Otherwise, the press embodying the small cylinder I8, is now transmitted through the piston 88 operates in a manner similar to the ports 28 to the pressure medium in the chamber. press containing the piston 28. -Upon releasing pressure in the chamber I8 (Fig. 2) to terminate I of the large cylinder 4, thus causing theapplica applying operation, the pressure vin tion of heavy. .pressurèupon the lower platen I8 athepressure chamber 5 instantly. drops substantially to lower suriaceot the large piston 8, now sub jected to pressure by the pressure medium. _It will be understood that the instant that pressure was applied through the ports 28 to the pres permost pressure applyingipositions. Hence the pressure medium in chamber 5 escapes through . i the passageway in the smalll piston 88 to the chamber I8. Since some portion of the pressure closed» Pressure is thus maintained between-the 'medium flows over ythe topmost surface of the platens I8 and I_2' for anydesired“ length of time. piston 88 escapes from lthe chamberv 8U When the operator decides that the work piece downwardlyand through vent 84, there is a distinct has received propentreatment, a controller mem ber (not shown) is operated to open'a release tendency for the pressure in themedium about valve in a pipe _leading from the chamber I8. the vent 84 to drop, so that pressure on the upper " ilat surface of the piston 88 is less than it ‘would 'This results in an instantaneousdrop in the pres sure medium in the chamber 5. the valve 84 was sure in the chamber I8 with the result that both be were there no`vent.l Probably there is only y pistons 8 and 28 descend until ports 28 are closed. small downward pressure on the__topmost surface The weight _of the piston 8 and superposed platen l of the piston. Hence, there is an advantage in ~ I8 produces, pressure in the medium in the providing this »piston 88 with an annular surface 2,118,098 65, away from the vent 6I, upon which pressure may be exerted in a downward direction by the pressure medium in the chamber 5, the pres sure in the chamber 5 being due to the weight Ul of the piston G and superposed ‘platen I l). 'I‘he piston 60 descends, ahead of the piston 6, by. reason of its own weight aided bythe pressure on the surface 65. Hence the passageway in the piston 60 serves for the discharge of thel pres lo sure medium in chamber 5, (Fig. 2,)- to insure that the piston 6 may descend promptly4 to effect open ing of a valve, corresponding to valve 34 (Fig. 1), whereby the medium in chamber 5 may be evacu ated. Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is: 1. In a hydraulic press, a movable platen, a cooperating platen, a large piston supporting the 20 movable platen to operate the latter, a cylinder in which the piston is movable, a small cylinder below the large cylinder and communicating therewith, and a small piston in said small cyl inder having abore extending therethrough- sub = stantially parallel to its axis, said small piston having further a ilat upper end surface to con tact a similar ñat surface on the lower end of the large piston whereby theupper end of the bore in the small piston is closed while both pis 30 tons are in their lowermost position and also dur ing upward movement of the pistons, caused by pressure 'behind the small piston to effect closing of the platens as a preliminary to the application of heavy pressure to the work piece in the press, 35 and said bore in the small piston serving as a pas sageway for the escape oi the pressure medium from the large cylinder upon release of pressure in the small cylinder. l 2. In a hydraulic press, a movable platen, a 40 cooperating platen, a large piston supporting the movable platen to operat-e the latter, a cylinder in which the piston is movable, a small cylinder below the large cylinder and communicating therewith, and a small piston in the small cylin 45 der having a iiat upper end surface to contact 3 from the large cylinder upon release of pressure in the small cylinder. 3. In a hydraulic press, a movable platen, a cooperating platen, a large piston supporting the movable platen to operate the latter, a cylinder in which the piston is movable, a small cylinder below the large cylinder and communicating therewith, a small piston having a ñat upper end surface to contact the lower end surface of the large piston and having further a chamber ex tending throughout the greater part of thelength f of said small piston with an opening onto the said iiat upper end surface of the small piston, said opening being normally closed by said large piston, a rod extending through the lower end wall of the small piston into the chamber thereof ' and having an enlarged end to serve _as astop to limit the upward movement of the small piston, and the lower end wall of the small piston hav ing a number. of ports furnishing permanently 20 open passageways between said small cylinder and the chamber of the small piston whereby the pressure medium is always free to pass in one direction or the other between the small cylin der and the chamber of said small piston, the 25 arrangement being such that the pressure medi um passes promptly from the large cylinder through the small piston to the small cylinder upon .release of pressure in the small cylinder. 4. In a hydraulic press, a movable platen, a 30 cooperating platen, a large piston to operate the movable platen, a cylinder in which the piston is movable, asmall cylinder in line with the large cylinder and communicating therewith, and a small piston movable in said small cylinder and 35 having a passageway therethrough from one end to the other, said small piston having further a flat end surface upon which said passageway opens and adapted to contact a similar iiat sur face on the adjacent end of the large piston 40 whereby that end of said passageway in the small piston is closed while both pistons are moving to gether, and said small piston having also an an nular surface at the same end as the said ñat sur face and at one side of the plane of said fiat 45 ' surface. with the flat lower end surface of the large pls ton when the latteris in its _lowermost position, 5. In a hydraulic press, a movable platen, a 'b said small piston having a bore extending cooperating platen, a large piston supporting the throughout its length and opening flush on the movable platen to operate the latter, a cylinder 50 said upper end surface of the small piston where in which the piston is movable, a small cylinder by the upper end of the bore is closed bythe below the large cylinder and communicating' 50 large piston, a pressure medium being applied therewith, and a small piston in said small cylin- . , under pressure to the lower end of the small pis ton whereby the latter is caused to rise and to lift 55 also‘the large piston, said small piston having a port opening- laterally from its- bore and opera tive at a certain point in the upward movement of the small piston to transmit pressure from the pressure medium in the small cylinder to that in 60 the large cylinder whereby the large piston is der having a passageway therethrough from one end to the other, said small piston having fur ther a flat upper end surface to contact a similar 55 flat surface on the lower end of the large piston whereby the upper end of said passageway'in the small piston is closed while both pistons are mov ing'upwardly together and while pressure is being applied to a work piece, and said small piston 60 moved upwardly under heavy pressure substan having also an annular beveled-off surface at its tially at the end of its upward movement, and` upper end below the -plane deñned by said flat said bore in the small piston serving as a pas surface at the upper end of the small piston. sageway for the escape of the pressure medium PAUL V. J. MERENDA. '