US1612479A - Manufacture of lampblack cartridges and the like - Google Patents

Description

Dec. 28,1926. 1,612,479

H. F. WELLHAUGER ET AL MANUFACTURE OF LAMPBLACK CARTRIDGES AND THE] LIKE Filed June 3, I925 fzvenl ro 21;.

Patented Dec. 28, 1926..

TN FIQE.

EERIi/IAITN FRIEDRICH WELLHA'USER AND ERNST VON BE'UTER, OF KAHL-ON IHE- MAIN, GERMANY, ASSIGNORS T THE FIREI RUSSFABRIK KAI-IL, OF IiAHL-ON-THE- :MAIN, GERMANY.

MANUFACTURE OF LAMPBLACK CARTRIDGES .Z-LND THE LIKE.

Application filed June 22, 1925, Serial No.

Cartridges intended for blasting with liquefied gases and consisting of a paper shell filled with the combustible oxygen carrier, require, as is already known, this oxy gen carrier to be in a very finely divided state in order that it may have a sufficient capacity for absorbing the liquid oxygen. Lampblack constitutes a particularly suitable oxygen carrier.

in the known loading machines the shell is slipped over a loading tube. Since the lanipblack will not trickle down the long narrow loading tube spontaneously, a worm conveyor, which passes the lampblack through the loading tube, is arranged inside the latter. The shell is pushed forward by the lampblack issuing from the tube in proportion as the loading progresses. A movable retaining member compresses the lampblack to a degree corresponding to the resistance oii'ered by said member, and, as the result of this compression, the delivery output of the worm decreases considerably. The limit of density of the charge is approximately 210 kilogs. per cbc. metre, but varies according to the density of the uncompressed lampblack, and beyond that point the output of the worm is already below the limit of economy. Since, however, lampblaek is compressible to a density of about 400 kilogs. per cbc. metre by pressure, and, owing to the increased blasting eii'ect resulting from the higher charging density, it is desirable to compress the lampblack to the maximum density possible. The object of the method 011 which this invention is based is to compress the lampblack to the highest possible extent without reducing the output of the worm. It has, in fact, been discovered that the loading operation can be accelerated and the compression increased when the pressure exerted on the cartridge by the movable retaining member instead of being kept constant, is varied by imparting an intermittent, semi-retrograde movement to the cartridge, that is to say alternately drawing the cartridge from off the tube for a certain distance and then pushing it back. During the outward stroke the loose lampblack passes without hindrance into the shell and is compressed during the return stroke. In this way, the mean rate of advance of the cartridge, under maximum compression, is about six times that obtained in the case 38,903, and in Germany December 11, 1924.

of constant back pressure, the capacity of the loading machine being increased accordingly.

The reciprocating movement of the abutment is imparted by a cam acting on the latter, said cam having an undulating periphery, so that the cartridge is alternately moved away from the tube and then pressed in the opposite direction.

Since it is necessary to vary the ratio of the compression stroke to the forward stroke when the uncompressed lampblack is of unequal density, in order to maintain uniform density in the cartrii'lge, a flexible or elastic member is interposed between the abuti'nent and the cam, said member being adapted to give way when the predetermined final density has been attained thereby preventing the occurrence of excessive pressure when denser lampblack is being charged.

In the drawings, in which like parts are similarly designated- Figure 1 is view partly in section of mechanism for performing the ope 'ation oi filling a cartridge case, and

Fig. 2 is a modification.

Referring to Figure 1, the lampblack is supplied by the funnel 1 to the filling tube 2 on which the paper or other cartridge shell 3 is slipped. The lampblack is positively fed by the screw l mounted in the tube 2. The shell 3 rests while supported in its position 011 the tube 2 on a recessed plate 5, between which and a seat 7 is included a spring 6 surrounding a pin secured to the plate 5 and slidable in stem 7 carrying the spring seat 7 The stem 7 is guided in guides 8 and carriesat its lower end a bowl 9 that is in engagement with a cam 10 slowly rotated. The cam 10 is so shaped that the cartridge case 8 is alternately lowered and raised, and at the same time given a downward feed motion as the cartridge fills.

The slow lifting of the cartridge case compresses the lampblack in the end of the tube 2, so that at the next descent the compressed lampblack is forced into the cartridge case by the screw.

The spring 6 limits the maximum permissible compression.

In Fig. 2 the stem 7 has connected to its lower end a cord 12 which passes over a guide pulley 13 and is fastened to a sector lever 11 pivoted at 14 and whose opposite end carries the bowl 9 acting on the cam 10.

The advantage of this construction is that the sector which acts as a multiplying lever permits the use of a much smaller cam.

The cam 10 rotates slowly, about once in ten to twenty seconds and thus differs from the jogging or settling action which is rapid, and as practiced imparts 00 to 1000 impacts per minute.

o claim:

1. In the art of making lamp-black cartridges, feeding the lamp-black to the cartridge shell While repeatedly and slowly moving the shell to compact the lamp-black in the shell contrary to the feed direction and delivering the compacted lamp-black to the shell at its reverse movement and at the same time feeding the cartridge in the general direction of the feed as the filling progrosses.

2. In a machine for loading lamp-black 20 cartridges which comprises a feeding tube and means to feed lamp-black into the cartridge cases, a reciprocatory support for the cartridge case while on said tube and a cam to slowly reciprocate the support while moving the support from the tube.

In testimony that We claim the foregoing as our invention, We have signed our names this 11th day of June, 1925.

HERB [ANN FRXEDRICH WELLHAUSER ERNST v. REUTER.

Images