US878092A - Apparatus for manufacturing metal tubes. - Google Patents

Description

.No. 878,092. PATENTEDIPEB. 4, 1908.

A. scnwmem APPARAIUS FOR MANUFACTURING METAL TUB A'PPLIQATION FILED 0O'I.-1. 1905.

No. 878,092. PATEKTED FEB. i908 A. SGHWTEGER.

w M w. I'XMQ/ misvspsz. I fPATENTED FBB. 4,-1908. A. SGHWIEGER.

APPARATUS FOR MANUFACTURING METAL TUBE-S.

APPLICATION TILED OO'ZA. 1905 .aaw: V

ARNOLD sonwraenn, OF 'BERLIN, GERMANY.

arranarns spa mnnracmme METAL TUBES.

are.- 878,092.

To an whom it may concern:

Beit known that 1-, ARNOLD SCH-WIEGEB, a subject of the German Em eror, and resident of Berlin, Germany, ccrt-alnnew and useful Improvements in Apparatus for Manufacturing Metal Tubes,

which the following is a s ecification. The present invention re ates to a hydraulic press for manufacturing metal tubes and is an improvement on the-press described in my co-pending application Serial No. 191,219, filed January 29, 1904,

In the present invention the mandrel which serves to perforate the metal bar is l fastened to the mandrel rod which passes through the hollow main piston and the auxiliary piston, in such a manner that, after having perforated the metal bar the mandrel is drawn back a little, and during the forward movement of the main piston it is moved forwards therewith in checked motion. This forward movement is effected by two racks at the rear prolongation of the mandrel-rod with whose alternately placed teeth engages" a double'toothed wheel, which is connected through levers with the draw bars which move the cross head guide of the main press piston. After the tube has been pressed, the mandrel-rod and the mandrel can be drawn back, by the action of a weight or spring, into its normal osition, after the driving mechanism for t e racks has been put out of gear.

The press is illustrated in the accompanyin drawings in which l igure 1- is a longitudinal section through the press; Fig. 2 is a horizontal section, and Fig. 31s a cross-section. Fig. 4 1s a sectional Similar letters refer to sim lar parts cross-head c by a hydraulically moved slide 0; z is the mandrel guided in the plunger h,

Z is the press-plate.

Q The mandrel-rod 8 passes through the hollow piston rod k of the auxiliary presspiston 0, which is guided centrally in the iollow main pressiston g'of the main driving cylinder 6. e mandrel-rod s is ma- 5 v I chined at its rear prolongations s and rests with its shoulder against the bottom of the nut u,'w hich is screwed upon the end of the hollow piston-rod 7:. To the prolongation s Specification er-gt'etters Patent. Application and emu-.54. .1905. Serial No. 281.347.

ave .iinvented- -The horizontal legs y of view showing the press adapted for pressing Patented Feb. 4, 18 08.

nately placed teeth,- and these 'mesh with two alternately arranged toothed wheels 1', rigidly l'eyed to the shaft w; to the ends of the shaft 10 are fastened two lateral arngsn), which are, moved by the drawbars qare connected two rocks 2 and z with altercoupled to the lower cross-liead guide j) o the main pressiston. The length 0 the arms v relatively to the radius ofthe wheels 1 is selected in such'a manner that reduced motion is transmitted from-the. guide 1) through the'bar (1 arm 12,

wheels 1' and racks z z to the mandrel-rod s s and mandrel 'L.

In order to be able to lift the toothed wheels outof the racks, there are arranged on the shaft w, in casings d, two erforated eccentrics a: connected to each 0t er by a bent shaft-t. the bent shaft are hollow, in order to receive the shaft w of the toothed wheels. At one end of the shaft t is arranged a crank-arm j moved by a drawrod ,which is connected to a lever B journaled on the platform S. If the lever is turned forwards, that is to say to the left, the eccentrics, to ether with the shaft 11), are turned insuc a manner that the toothed wheels rare thrown out'of gear with their racks.

In order to draw back the mandrel i, a weight (not shown in the drawings) may be caused to pull at the prolongation s, either throughan angle-lever or through a rope running overa pulley. But this arrangement does not form apart of the invention,

as the end of the racks may quite as well be connected to springs,.which are tensioned by the forward movement of the mandrel-rod s s and draw back the mandrel-rod when the piston-o returns.

The mode of working is as follows. After the unperforated metal bar has been put into the pressure cylinder a,'the driving device for the mandrel 1s uncoupled by means of the lever B in the above described manner. Karen on the auxiliary press-piston 0 with the ho ow piston driven forwards b hydraulic pressure, whereby the mandre -rod s;the rolongation along with it, and the latteris forced through the metal bar for the pur ose of perforating it. Thereuponthe man rel is made to return under the action of a Weight, or spring, in the above described manner, to such an extent that its end 1) projects a few millirod is: and the nut u, is-

the racks z, z and the mandre i, are moved back so far that the Having thus described my meters into the matrix Finallythedriving-device is thrown into gear by the lever B and the mandrel together with the main press-piston, is driven forwards, while the' mandrel advances correspondingly and with checked motion relativel to the main presspiston, so that gradual y and successively another part of the core, as forinstance p p and so on, passes into the o enin of the matrix, and in this way the tu es will be sure to be always of the same diameter and the mandrel will be worn out uniformly. l/Vhen the pressing process is finished, the driving wheels 1' of the mandrel are'again disconnected so that the mandrel can move backwards under the action of the said weight or s rin'g. If massive bodies are to be resse the mandrel-rod s, with the mand el i, is drawn oint of he-core is behind the face of the p unger h, whereu onan imperforate press-plate 1, instead of t 1e perforated plate], is placed upon the plunger as shown in Fig. 4. v invention, what I claim and desire to secure y Letters Patent 1. In a hydraulic press the ,combination with the plunger and its driving piston,-0f a mandrel, means for-moving ghe mandrel independently of the plunger and piston, and connection between the driving piston and the mandrel whereby the mandrel may be firiven by the piston. i i 2. In a hydraulic press, the combination with the plunger and its driving piston, of a mandrel, means for moving the mandrel independently of the plunger and piston and connection between the driving piston. and the mandrel whereby the mandrel may be driven by the piston and at a speed different from that of' the plunger.

' 3. In a'hydraulic ress, the combination with the ressu're cylinder terminating in a matrix, 0 'a plunger, a driving piston forthe plun er, a mandrel, means for pro'ecting the mandrel through the pressure cylinder into the matrix, anda connection between the drivinglpiston and the mandrel whereby the mandre during thePm-zssing1 operation. In testimony w ereof I have signed my name to this specification in the, presence of two subscribing witnesses.

' ARNOLD SCHWIEGER.

Witnesses:

HENRY HASPER,

WOLDEMAB. HAUPT.

is caused to advance in the matrix

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