‘Dec. 24, 1946. K. J. YOST 2,413,094 METAL TREATING APPARATUS Filed Dec. 9, 1944 Y ‘E. SirQ NQ mu INVENTOR. KENNETH J YosT AGENT 2,413,094 Patented Dec. 24, 1946 UNITED‘ STATES’ PATENT OFFICE 2,413,094‘ gamma APPARATUS Kenneth; ‘.LYojs't; westport??onrig asfsignor to Remington Arms Qompa‘n'ygjhia', Bridgeport, Conn, a corporation of Delaware Application December 9, 1944, swarm. 565,353; (01. 259-425‘) . . 7 ~ 1 1‘ 2' , only a limited’p‘or'tion of the lower side of'veach The present invention'relates to a device for cone is immersed in‘the bath, as indicated by the, treating articles and is particlarly adaptedior pickling and washing metallic articles such as‘ small arms ammunition components. liquid level line in Fig. 1. . A~ spiral ?ange is An object of the invention'is the provision of an improved drum fortreating' metal articles. A vides a channel or passage for‘ the components by which they‘ are advanced from the forward further objectis to provide a drum for pickling, washing or otherwise treating metal cups, draw pieces or cartridge cases, the drum being de end of the cone through the liquid ,bathvand ‘dis-l charged from the rear‘ end o-f‘the cone int'oth'e formed on'the inner wall of each cone and pro forward end of the next succeeding cone. It ‘has been customary to deliver‘ the annealed compo-f signed to‘enhance ‘the freeand uniform rate'of movement of the articles therethrough. I _ nents'directly' from the. furnace into the entrance These and other objectshfeatures and advan tages of the invention will, be‘ described more fully in the following description of thei'inve'nJ tion, aneinbodiment'thereof being shown in the drum. The'pickling drum' conveys the compo nenfts through a dilute'sol'ution of sulphuric acid, and from thence‘ to the next succeeding pair of: drawing, in which: endof the’ first cone, the latter being the pickling: 15 cones which convey thecornponents through a ' ’ Fig, 1 is a side elevation, partly in section, of rinsing bath. From the rinse, the components are fragmentary portions of similar drums secured nentsv are immersed in a soap solution to further conveyed into the. last cone where the compo: the improved drum of this invention'nincluding at opposite ends thereof.’ _ v _ ‘ g _ Fig.2 is a fragmentaryv plan view‘of the inside 20 neutralize any acid thereon and to provide a thin" lubricating coating on each component. 7 The foregoing description is simply for the purpose of teaching a proposed use of the ini wall of the drum including a portion of the helix.v In general, cartridge cases are‘ manufactured proveddrum of thisinvention. A more detailed by punching and drawing brass blanks from sheet stock. In the drawing or working of the brass, the metal work hardens and the resistance description ‘of apparatus for similar purposes may be‘ found in the prior‘ art,as,' for example, the to'fu'rther working or drawing increases. can: Needha'm‘ patent, No, 1,383,413, July 5, 1921; sequently, it is customary to anneal thevdrawn articles or components between successive draws to restore the normal properties of the metal. It will'be‘. understood, however, that the sug gested _ use ::of the ‘improved druinfof this "inven tiori is‘not a limitation thereof andv that it may 30 . The anneal is carried out in a suitable furnace have'oth'er uses‘ and embody modi?cations all through which the articles are conveyed in quan within the scope of the appended claims. The drum shown in Fig. 1 comprises a sub tity, surface oxidation inevitably occurring ad jacent the furnace exit. The oxide or scale must be removed before the components are passed on to the next operation, and this is generally done by conveying the components through a dilute solution of sulphuric acid, known as a pickling bath, after which the components are rinsed and then neutralized or lubricated by immersion in a 40 stantially symmetrical conical member 10 having a relatively large entrance end II and a small exit or delivery end l2, both the entrance end II and exit end I2 being shown bolted to the adjacent ends of similar cones. The shell or wall II)’ of the drum is perforated for a portion of its length and is provided on its inside with a continuous spiral ?ange or helix l3 formed in soap solution. tegral with the wall l0’, the successive convolu Apparatus for conveying the annealed compo tions of the helix being substantially equally nents through the pickling, rinsing and lubricat spaced throughout the length of the cone. ing baths has comprised, heretofore, a series of perforated cones or drums arranged to rotate in 45 In the present embodiment, the pitch p of the helix is substantially six and one-half inches tandem, that is to say, all turning together on a which has been found to be especially suitable common longitudinal substantially horizontal for enhancing the freedom of movement of the axis, the large or entrance end of each cone, with components through the passage or channel l4 the exception ‘of the ?rst cone, being securely fastened to the small delivery end of the preced 50 formed between successive convolutions of the helix. ing cone as indicated in Fig. 1. Each cone is As shown in the drawing, the ?rst convolution adapted to be supported by rollers over a recep l3’ of the helix is not complete but extends sub tacle (not shown) containing or adapted to con stantially half way around the inside of the drum tain an appropriate bath liquid, the relationship between each cone and its bath being such that 55 and is spaced from the wall ID’ at the entrance 2,413,094 3 end ll of the drum, a distance which is not less than the width 11 of the channel M. In accord ance with this construction, the width of the he lix channel [4 is substantially uniform through out its entire length and hence the possibility of components being jammed between the wall of the intersection of the bottom of the rib l5 and the bottom of channel [4. Articles so disposed cannot wedge or jam between the ?ange of the channel and the rib l5. Thus for substantially all positions that the components may momen tarily assume while being advanced through the spiral, no wedging or bending of the components the drum and the ?rst convolution l3l of the spiral at the entrance end of the drum is pre eluded. The drum I0 is also provided with means to prevent articles from becoming jammed or well known means such as described in the afore- ' wedged in the channel M of the helix as they are advanced therethrough. To this end an annular mentioned patent, and hence all components in1 the drum will be advanced freely and at a sub rib I5 is formed on the inner wall'of the drum stantially uniform rate through the drum. The ispossible. ; . f - v 7 ‘ ' " The drum is adapted to be rotated on its 1on gitudinal axis in a well known manner and by substantially midway of each pair of convolu- i‘ 1 improved performance of the drum is especially tions of the channel [4. As shown, the rib I5 is continuous in length and has a smoothly round ed pro?le IS’. The ri-b I5 is of such height that I components disposed thereon will be held up off of and make an angle with respect to the bot tom of the channel l4. As a consequence, it is manifest when such requirements as critical 1m 'mersion periods and quantity production sched ules are to be achieved. What is claimed is: 1. A device for conveying articles through a bath comprising a conical perforated drum ro tatable on its longitudinal axis in a substantially horizontal plane, said drum having a spiral in impossible for two components to nest end to end, see Figs. 1 and 2, and hence to become wedged crosswise between the convolutions of the spiral. ternal ?ange by which articles deposited in said Moreover, those components which lie crosswise drum are gradually advanced therethrough; and of the channel make ‘substantially point contact an annular rib on the inner wall of said drum, said rib being arranged parallel to and interme at their opposite ends with the rib l5 and the bottom of the channel I4 respectively or with diate successive convolutions of said spiral to the rib and the adjacent ?ange or convolution of prevent articles from wedging therebetween. the spiral as shown in Fig. 1. The components 30 ' 2. In a device for conveying articles through a are thereby supported in a comparatively unsta bath, the combination with a conical perforated ble condition, and hence are susceptible to greater drum rotatable on its longitudinal axis in a sub agitation, more thorough tumbling and more stantially horizontal plane and having an en rapid advancement through the drum than has trance end; of a spiral internal ?ange in said been the case when the components were allowed to lie ?at and become jammed on the bottom of drum, said spiral comprising substantially equally spaced convolutions arranged to gradually ad the channel. Fig. 1 also illustrates one compo vance articles through said drum, and an in nent lying with its longitudinal axis substantially complete convolution'at the entrance end of said drum arranged to provide a space between the parallel to the longitudinal axis of the channel and a second component extending transversely of the 40 beginning of said spiral and the adjacent wall of said drum of a width' not less than the dis channel and supported precariously on the rib l5. Again there is no possibility of componets so dis tance between successive convolutions of said spi posed becoming wedged between the parallel ral to prevent articles from jamming at the en ?anges of the spiral. The width of the channel trance end of said drum; and an annular rib l4 isdetermined in part by the geometry of the A: El on the inner wall of said drum, said rib being arranged parallel to and midway of successive components and is such that, in the event two components extending longitudinally in the chan convolutions of said spiral to prevent articles from nel substantially side by side, as shown in Fig. 2, wedging between successive convolutions of said the component adjacent the center of the chan spiral.’ v nel will contact the relatively large radius r at " ' KENNETH J. YOST.