US2094798A

US2094798A - Press

Info

Publication number: US2094798A
Application number: US85443A
Authority: US
Inventors: Kehrbeck Karl
Original assignee: Deutsche Waffen und Munitionsfabriken AG
Current assignee: Deutsche Waffen und Munitionsfabriken AG
Priority date: 1935-06-05
Filing date: 1936-06-15
Publication date: 1937-10-05
Anticipated expiration: 1954-10-05
Also published as: GB476245A; FR807069A; DE673251C

Description

Oct. 5, 1937. -K. KEHRBECK PRESS Filed June 15, 1956 Figt4 KARL KEHRBECK Inventar:

ATTORNEYS Patented Oct. 5, 1937 UN ITED STATES PATENT OFFICE PRESS Application June 15, was, Serial No.'85,443

In Germany May 5, 1935 4 Glaims. (01. 18- -16) This invention relates 110 pastille or like presses for pressing powdered charges in a, plurality of capsulesor the 1ike under a, definite and regulable pressure.

During making 01" the cores 0f illuminating and priming charges as well as the fillings 10r e'xplosi0n capsules and primers Dr percussion caps said cores or fillirigs are subj ected to a previos exactly defined pressure in order 120 attain a, definite degree 0'f denSity of sa'id cores 01' fillings.

In mechanically actuatedpresses used for tnis purpose, a press-plunger serves to suddenly compress said eures or fillings with a, uniform amount of pressure. In presses of th1's kind, however,

there is the disadvantage, that the air contained.

in the powder-charge cannot escape to a, sufficient In order to increase the working capacity of the press and to further improVe its mode of operation according to myinvention I propose to coustruct the press.to permit the simultaneous pressing 01 a sei: 01' plurality of such cores er fillings by a single working step of the press with the aid of hydraulic er pneumatic means. By my inverition the.aforementioned disadvantage iriherent to mechanically operated presses is successfully avoided, proper escapement of the air contained inithe pow der charge being attained during the gradually increasing operating' pre-ssure in a hydraulically or pneumatically operated press.

' In oraler to properly apply and utilize the hydraulic o1 pnematic pressure, according to.my invention I make use of metallic bello-ws-chambers: as apressure transmitting means. In addition to this, according to my inventio n I provide further special devices for imposing upon said 'hellows-charnbers a load or pressure which may be regulated Within any desired limits, said 1oa.d or pres sure and the regulatiou thereof being effedted. by meansof a Weight 01 spring actin g on seid devices. According to my invention, the

- press is further equipped with a contriva'ncepermitting to attain proper equalization of the pressure eXer ted 011110 said cores or filling s by the press-plungers, such equalization of pressure being especially of advantageif one 01" sever3l of the c.o ras orfillings that had been preliminarily compressed an insuffiqi ent extent, or in case cores or fillings of improper weight have to be workecl in the press. By meins of the aforesaid contrivarice it Will be possible to always cojnpress the said eures orfillin%s witlq phe grequiregl uniform pressure, irrespe ctive of the fact, whether one 0r several of the set of cores or fillings to be worked in thepress are missing or whether they are not of the proper weight. 'I'his contrivance consists essentially of a system of press-plungel s and double-armed levers c0-operating With eac h other the leverage of the severa1 1evers being properly chosen to attain a, uniform distribution of the pressures exertecl by the press-plungers on1she individual eures er fillings.

In order to regulate the hydraulic er pneumatic pressure serving for the operation of the press within the desired 1imits, according 1:0 my invention a second bellovvs-chamber is associated with the former and adapted to be under the action of a, properlyadjustabh springor weightact uated pressure device. In addition so this, my nove1 press is provided. with an optical 01' acoustic signalling or indicating device which may be operated either mechanically or electrically tov indicate the condition of the set cf cores or fillings 1 at atime Worked in the press, and more especially, to indicate whether a, core or fi1ling is missing or whether some defect is present in one er the other element of the set. Y

In the dravving which forms part of this specification I have represented an example of a-construction of my press, Fig. 1 being a front-view, Fig. 2 a side-v1ew and Fig. 3 a plan-view thereof. Fig. 4 is a view of the indicating 0r signalling de- -vice forming part of the press.

The construction and operation of my nove1 press is as 'follows.

Motion is transmitted'to the press by means of a driving shaf I carrying a worm '2 in mesh with a worm-wheel 3 on the main shaft 4'. The 1atter is provided on either end thereof with a qam-disk 3 l ea.ch of saic1 cam-disks engaging with one end of a, bell-crank 32, thus rocking the latter durin rotation of the former. The other end of either bell-crank 32 extends into a s1ot 33 in either of the bo1ts 54, thus imp-arting downward motion to sa.id bolts. The bolts 34 are connected with each other by means of a transverse pressure-bar3fl carrying the system of 1evers operating the press-plungers I II. The latter are mounted in a transverse guide member 38 preferably of the form of a platze, said guide member being likewise carried. by said bo1ts 34 so that downward operating motion Qf the latter iS likewise imparted said guide member 38, The press-plungers E I thus, upon downward motion of said guide member 38 and said bolts 34 will be pressed. against the eures er fi11- ings H) for thecharge, priming caps er the like, thus compressing the same. The cores orfillings I screws or otherwise to the lateral Walls or pillars' slight pressure against the fillings I0 anal thereupon the under bellows-chamber I'I is compressed. by action of the cam-disks 5 and 6 on the main shaft I. 'Ihe under end of the upperas wel1 as the upper end of the under bellows-chamber, 36, I are firmly connected 130 an intermediate 01 central member 36 interposed therebetween, said member 35 being fixed on either end by means 0f 4I cf the press. Both bellows-chambters I and 36 are connected With each other by means of a supply Conduit and fi11ed with operating liquid. Upoi1 compression of the under bellows-ch'amber 7 by action of the cam-disks 5 and. 6 thereon, Ehe operating pressure is transmitted from the under tothe upper bellowschamber thus expanding said upper chamber 36 and forcing the pressure member or platze 3'I as we1l as ehe pressplate 9 upWard 150 cause compression of the cores or fillings I0 by the p ressplungers II.

If the bellows-chamber 7 is still further compressed, the liquid contained therein Will flow through the conduit I2 into another bellowschamber I3 causing the latter to expand and. moye forWard With its front part and the roller I5 imp arting rotauion to the worm I6. The shaft 0f said worm I6 carries a disk I'I having a stee1- band I8 fastened. at one 0f its ends t0 the periphery of said disk, said steel-band acting on a bell-erank I9 which is provided with a weight resting adjustably on the longer arm thereof.

During compression 01 the bellows-chamber 36 the p1ess-plungers II will more firm1y abut -against the fillings I0 and the plate 6 in which they are seated, thus causing ehe operating pressure=tobe transmittedfrom chamber 36 through conduit I2 to the bellows-chamber I3 With the result that the latter will expand and rotate the WOIII1' I6 and the disk I'I, thus adjusting the bellcrank I9 by means of the steel-band I8. 'I'he 1ever I9, hewever, can only be adjusted, if itis able to overcome the torque acting thereon due to the weight 20. In tl'u's manner it will be possib1e to impart to thepress-plungers II a comstant and uniform final pressure owing to the action of said weight. This pressure may be regulated within any desired limits by adjusting the weight 20 on the longer arm 0f the bellcrank I 6.

In case one 0r more of the cores o1 fillings to be worked in the press are missing, the same operating pressure may be imparted to the remaining cores or fillings on the plate 9 as in case all cores are present in the 1atter by properly interconnecting the pressmlungers by means of a special combination er system of 1evrs as shown ab the upper part of Fig. l.

The distribution of pressure in this case takes *place in Ehe following manner. Assuming a total operating p-ressure of kg., and even distribution of pressure over the plungers, each 0f the live plungers II wou1d receive a pressure of 20 kg., which is attained by properly dimensioning the lengths cf the arms of the first; or main 1ever 22 pivoted 170 a holt 2I on the transverse pressure bar 39. In accordance with the lengths of the arms of the several levers there will be obtained a pressure 0f 40 kg. on the right-hand. half and a. pressure of 60 kg. on the left-hand. half of the plunger and lever system. Ihis pressure of 60 kg. on the left-hand half now is transmitted to the ends 0f lever 23 and by properly dimensioningthe arme of this lever, the right-hand end Will act with pressure of 20 kg. and the leih-band. end with a pressure of 40 kg. These two pres- 'sures of 20 anal 40 kg. are transmitted onto the pivot point 24 of the lever 25 With arms 0f even length, thus imparting to each of the two plungers" COI1I1GCGG. theretoa pressure '0f 20 kg. If for instance, these two plungers on the left-hand side cf the plunger and lever system de not find an abutment on account 0f cores or fillings missing ab these places; on1y 20 kg. of the said. 60 kg. which aco on the left-hand end of lever 22 will be transmitted 130 the middle plunger of the system. The several plungers II are mounted movably in the transverse guide 38 under the action of cylindrical spira1 springs 42 hat are compressed during downward motion of said plungers. II one of the plungers, owing 130 the missing of the respective core er filling, does not find an abutment during Operation of the press} I:he respective cylindrical spira1 spring will be compressed and this pressure, amounting in the present case 20 kg. Will be transmitted. to the transverse guide 38.

'Ihe aforedescribed System of levers and plungers will effect an automatic equalization of the operating pressures of the several plungers, With the resu1t that each of the set of cores or fillings worked at a time in the press irrespective of the fast whether one or more of the cores or fillings of the set are missing, will invariably be acted upon by an even uniform operating pressure Which may be chosen in accordance wih the present rte'quireinents.

In order supervise or control the operation of the press, there is provided a special indicatping or signallingdevice shown in Fig. 4. Ihis device consists of levers in the form of pointers that are rotated backward. whenever a plunger II acts upon a core o1 filling and cause a number 130 appear and disappear in a window above the respective plunger, the appearing or disappear- Ing numberindicating the presence or absence 0f the respective core 0r filling. This pointer may also be constructed in such a maner that in the absence of a core or filling of the set an electrical contact is made or broken causing ringing of the hell er effecting an optical signal.

The amount of the operating pressure ab a time prevailing in the press may be indicated by a. pressure-gauge 26 connected the above mentioned conduit I2. Instead 0f a hydraulic transmission of the operating pressure to the pressplungers, evidently also a pneumatic transmission may be employed. In the latter case the several bellows-chambers as well as the other operating members of'the press may be fully retainedl 'Ihe distance between the press-plate 9 and 'Ihe operating any desired limits. This a.djusting device in addition, permits simultaneous adjustment of all press-plungers II, without necessitating any individual adjustment of the latter.

The herein described press and its operating members may be modified in various ways Withut departing from the spirit of my invention and sacrificing any 0f its advantages. Thus, for instance, instead of employing single bellowschambers also chambers formed by a, plurality of bellows, arranged side by side, may be used, as will be evident 110 anyone skilled in the art. Furthermore, instead of a liquid operating medium also air may be used in said bellows-chambers, a. broad principle of my invention consisting in the use of bellows-chambers in connection With a system of double-armed levers and press plungers in presses of the character described.

I claim:

l. A pastille or 1ike press for completing the pressing of sets of powdered fillings or preliminarily pressed cores or the 1ike, said press comprising a, pressure member including a plurality of metallic bellows chambers containing a pressure medium, an adjustable tension-actuated device associated With. said pressure member for regulating the operating pressure thereof, a, press plate including means for receiving and retaining said fillings or cores thereon cooperating With sa.id pressre member press plungers for compressing said fillings 0 cores, and pressure equalizing means cooperating with said plungers anal 1 comprising a. system of double-armed levers f01 equally divicling the pressure upon said plungers.

2. A press as specified by claim 1 including a member for guiding said press plungers, a, transverse pressure bar connected 130 said guide memher and spaced a, fixed distance therefrom, and resilient means interposed between said guide member and each of said press plungers for transmitting a, respective part; of the operating pressure onto said guide member anti said transverse pressure bar if a filling or core of the sei; is missing from said pressure plate.

v3. A press as specified by claim 1, including a guide member for sa.id press plungers, a transverse pressure bar connected to said guide memb8l' and spaced a fix-ed distance therefrom, and resilient means interposed between said guide member and each of said press plungers for transmitting a respective part of the operating pressure onto said guide member and said transverse pressure bar if a, filling or core of the set is missing from said pressure plate, said adjustable tension actuated device prviding said bellows chambers with an even and uniform operating pressure.

' 4. A press as specified by claim 1, including a uide member for said. press plungers, a transverse pressure bar, connected to said guide member but spaced. at a fixed distance therefrom said equalizing means and said press plungers being secured to said transverse bar, resilient meansinterposed between said guide member and each of said press plungers for transmitting a respective part of the operating pressure onto said guide member and saicl transverse pressure ba.r if a, filling er core of the sei: is missing from said pressure plate said guide member, said transverse pressure bar said equalizing means and said press plungers forming a unit means for securing and guiding said unit, means for controlling the distance of seid unit relative 130 said. press plate, and meang for periodically compressing said bellows chambers and for reciprocating said securing means tagether with said unit with respect to sa.id press plate and the fillings or cores thereon.

KARL KEI-IRBECK.