US1819704A - Press - Google Patents

Description

Aug. 18, 1931.

A. FRlz PRESS Filed Feb. `19, 1950 2 Sheets-Sheet J.

Aug. 18,1931. .FRIZ I 1,819,704l

v PRESS Filed Feb. 19, 1930 2 Smets-sheetl 2 fr *a I; S ,fz /f E ff* 3 n I Mg@ y Mm Wg.

Patented ug. 1.8, 1931 UNITED STATES A;DoLF Falz, or srUTTGAR'r-cANNs'rAK'rT, GERMANY PRESS Application led February 19, A1930, Serial No. 429,606, and in Germany March 1, 1929.

M invention relates to presses and more partlcularlyto power presses. It is an object of my invention to provide a press in which the advantages ofmechanical and luid operation are combined.

' 'To this end I provide mechanical means for performing. the primary stage of the pressing operation, and luid-controlled-means for performing its final stage.

My invention will be described in connec` tion with a machine for pressing ply-wood, but it is to be understood thatl am not limited to this particular type of machine but may adapt my invention to anytype of press, for instance to hailing presses.

' Hydraulic presses are comparatively high, which is inconvenient as it is often necessary to provide a deep pit for accommodating the machine in a low shop. Such presses While 2o presenting the advantage that the operating pressure can be ascertained very exactly by pressure gauges throughout the operation, involve the drawback that their operation is slow, unless auxiliary cylinders are provided for performing the primary stroke at a faster rate. On the other hand mechanical presses and more particularly presses equipped with electric motors operate at a higher rate but involve: the drawback that the o erating pressure can be ascertained only rom the power input of the motor, a

system which is rather inaccurate.

y These drawbacks are.` removed, according to my invention, by a combined operating system. The primary stage is performed by mechanical means, for instance by a motor in combination with reduction gearing, racks or spindles, and the final stage is performed under the action of fluid under pressure, for instance by a'hydraulic machine.

In a preferred embodiment of my invention I provide a presser plate, a nut on the presser plate which is Supported on a vertical spindle, or any number of nuts and spindles as required, generally a pair of spindles, each with a nut. The spindle, or

spindles, is .held against -rotation while a motor with a/worm gear is provided for imparting rotation to the nut so as to raise and lower the presser plate which is supported Fig. 1, drawn to a larger scale.

on the nut or nuts. The spindle or spindles, is adapted to be displaced axially and provided with a hydraulic piston.

The motor is operated during the primary l stage of the pressing operation, i. e. until the presser plate encounters a considerable resistance. The presser plate now becomes stationary and upon further rotation of the Worm gear the spindle is raised. When the piston of the spindle has arrived at the upper end of its stroke the current supply to the motor is switched 0H, preferably b automatic means and a pump is started or supplying liquid to the hydraulic cylinder. The spindle with the presser plate now, descends and performs the final stage under hydraulic pressure.

In the drawings aixed to this specification and forming part thereof a ply-wood press embodying my invention is illustrated dia. grammatically by way of example.

In the drawings f Fig. 1 is an elevation,

Fig. 2 is an. end elevation of the preSS, viewed from the right in Fig. 1, with the motor removed, and4 Fig. 3 is a section on the line III-III in Referring now to the drawings, the frame of the press is built up from vertical and horizontal sections. The pair of vertical sections constituting the upright at the left of the press is indicated at 1 and 2 in Fig. 2, 3 is one of the vertical sections constitutlng the upright at the right, 12 and 13 are channel sections connecting the upper, and 6 and 7 are channel sections connecting the lower ends of the uprights. 8, 9 and 10, 11 are channel sections extending across the vertical sections of the uprights above the channels 12, 13, and 5 is a bolster plate whichis placed across the sections 6 and 7 4 is the presser plate which is provided with a casing 18 for the reception of the reduction gearing as will be described. v k

14 and 15 are threaded spindles which are fitted between the sections of the two up'- rights. The lower end of each spindle is provided with a reduced extension'23 of squaresection which is inserted in a transverse bar which is arranged a 24'of eachupright, as best seen in Fig. 2. The shoulder betweenA the spindle and the extension absorbs the downward thrust on the s indle. The vertical extension prevents rotation of the spindle but rmits axial displacement in upward direction for a purpose which willpresentl be described. 16 `and 17 are nuts or threade sleeves which are mounted on the spindles 14 and 15, respectively, 19 is a worm gear on each nut, and 20,20 are worms which cooperate with the gears 19 on the respective nuts. 21 is a shaft which extends throughout the frame 18 of the presser plate 4 and on which the worms 20, 2O are eyed. 22 is an electric motor which imparts rotation to the shaft 21. l

25I are pistons at the ends of the s indles 14 and 15, as shown for the spindle 14 in Fig. 1, and 26 are hydraulic cylinders supported bythe transverse sections 8, 9 andlO, 11, in which cylinders the pistons 25 are litted to slide. 28 is a pum 27 is a liquid reservoir ve the cylinder 26 at the left end of the machine, 29 is the suction pipe, 30 is the delivery pipe of the pum V28, the

' suction pipe beingconnected with t e resertank 2 voir, and 31 is a three-way valve at the end of the pipe 30. 34 is a pi e extending from the three-way valve 31 to t le reservoir 27, 35 isa pipe extendin from the valve to the upper end of the adgacent cylinder 26, and 36 isa p pipe extending from the valve to the upper end of the cylinder 26 at the opposite .end of the press.,

37 is a hot-water tank for supplying the heated parts (not shown) of the press.

33 is a switch inthe circuit of the motor 22, and 38 is a dog on one of the spindles, for instance 15, as shown in Fig.. 2, by which the current is switched oi when the spindle has arrived at the upper end of its stroke.

The operation of my press is as follows When the material to be pressed, in the present instance ply-wood, has been placed on the bolster plate 5 the valve 31 is set so as to connect the ipe 34 with the pipes 35 and .36, and to brea the connection with the delivery ipipe 30. Pressureless liquid from the The pistons 25 are atjthe lower end o their stroke as shown at the left in Fig. 1.

. The motor 22 is4 now started rotating the nuts 16 and 17 and lowering the presser plate 4 with the casing 18. The downward 'movement of the presser plate continues unf ltil the resistance of the partly compressed material between the plates`4 and 5 has become equal to the thrust exerted on the presser now penetrates into the cylinders .so ythat they are permanently filled with liquid.

The square extensions 23 are so long that they will not move out of their holes in the trans# 1 verse bars 24 when the spindles are shifted so that the spindles are held a ainst rotation the pipes and 36, and to break the connec-A tion of these pipes with the pipe 34, and the pump 28 is started. Liquid from the reservoir 27 is drawn into the pump 28 through the suction pipe 29 and delivered to the cylinders 26 through the delivery pipe 30 and the pipes 35, 36, forcing down the pistons in these cylinders and app ying the presser plate 4 tothe material'. When the desired pressure has been attained, the pum 28 is arrested. The pressure is read exactl;y at` a pressure gauge (not shown) as in'any hydraulic machine. When itis desired to return the parts to their initial position the connection of the pipes 35 and 36 with the lished so that the liquid rom the cylinders can be discharged into the reservoir 27 where it is not under pressure and the motor 22 is started.

The principal advantage of. my'novel press is that its operation is rapid as compared with a normal hydraulic press while at the same time the operating pressure can be read throughout the final stage.

The overall height of the press is much reduced ascompared with the normal hydraulic presses, and the press is a self-contained unit 'suitable self-contained unit is' obtained.

Other means than spindles, 'for instance racks, may be provided for reciprocating the presser plate mechanically.

I wish it to be understood that-I do not del sire to be limited to the exact details of construction shownand described forobvious modifications will occur to a person skilled 4 in the art.

In the claims `aiixed to this specication no selection of any particular modification of the invention is intended to the exclusion of' other modifications thereof and the rightto subsequently make claim toany modification not covered by these claims is expressely reserved.

1. A press comprising a frame, a bolster nut, means on said presser plate for impart- 'h ing rotation to said nut, a piston at the end of said spindle, a cylinder in which said pis ton is iitted to slide, and means for supplying l fluid under pressure to said cylinder.

I 2. A press comprisin a frame, a bolster plate, a threaded spind e, a thrust bearing for said spindle in said frame, a reduced ex- A tension at the lower end of said spindle forming a shoulder which is supported on said bearing, said extension being adapted to pre- Y ventrotation of said spindle in said bearing lo but to permit axial displacement, a nut on said spindle, a presser plate supported on said nut, means on said presser plate for mparting rotation to said nut, a piston at the end of said spindle, a cylinder in which said u, piston is fitted to slide, and means for supplying fluid under pressure to said cylinder. 3'. A press comprising a frame having an upright, a bolster plate, a threaded spindle itted to slide in said frame but held against rotation, a nut on said spindle, a presser plate supported on said nut, means on said presser plate for imparting rotation to saidnut, a piston at the end ofsaid spindle, a cylinder in which said piston is fittedv to slide, anda pump on said upright for supplying fluid under pressure to said cylinder. y v

4. In a press, a presser plate, a spindle for actuating said presser plate, mechanical means adapted to alternately displace said plate with respect to said spindle, and said spindle-With respect-to'isaid plate, and: hy-

draulic means adapted to exert thrust on said spindle.

5. In a press a self-contained frame comprising a base structure, uprights secured to said base structure, a presser plate in said.

frame, spindles on said uprights for actuating said presser plate, mechanical means adapted to alternately displace said plate 40 with respect to said spindles, and said spindles with respect to said plate, and hydraulic means adapted to exert thrust on said spindles.

6. In a press a self-contained frame comprising a base structure, uprights secured to said base structure, a presser plate in said frame, spindles on said uprights for actuating said presser plate, transverse members on l said uprights, hydraulic cylinders in said transverse members, pistons on said spindles mounted to slide in said cylinders, step bearings for'said spindles in said base structure,` mechanical means adapted to alternately displace said plate with respect to said spindles, and-said spindles withrespect to said plate, and hydraulic means adapted to 'exert thrust on said spindles.

In testimony whereof I aiix my signature.

ADOLF FRIZ.

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