US2447855A

US2447855A - Cap die

Info

Publication number: US2447855A
Application number: US706318A
Authority: US
Inventors: Carl W Goodwin; Kenneth R Allen
Original assignee: American Seal Kap Corp of Delaware
Current assignee: American Seal Kap Corp of Delaware
Priority date: 1946-10-29
Filing date: 1946-10-29
Publication date: 1948-08-24
Anticipated expiration: 1965-08-24

Description

All@ 24, 1948.V c'. w. GoonwlN ET AL 2,447,855

CAP DIE Filed Oct. 29, 1946 v 4 Sheets-Sheet 1 INVENTORS. C. W 6'0 @dwz/7 ATTORNEY.

All@ 24, 1948. c. w. GoDwlN ET AL 2,447,855

CAP DIE y Filed Oct. 29, 1946 4 Sheets-Sheet 2 INVENTORS C. W Good w01 BY 9 /f' WATTORNEY.

Aug. 24, 1948. 1 c.' w; GOODWIN ETAL 2,447,855

CAP DIE Filed oct. 29, 194e 4 Sheets-sheet s A? w w@ Aug. 24, 1948. c. w. GOODWIN ET AL. 2,447,855

CAP DIE Filed oct. 29, 194e 4 sheets-sheet 4 ATTORNEY.

Patented Aug. 24, 1948 UNITED STATES PATENT OFFICE i. GAP DIE Carl WL Goodwin', Planeld, N. J., and Kenneth R. Allen, Ridgewood, N. Y., assignors to American Seal-Kap Corporation of Delaware, Wilmington, Del., a corporation of *Delaware Application October 29, 1946, Serial No. 706,318

(Cl. .9S- 1.3)

1% Claims. 1

This invention relates to dies for making paper bottle caps of the typeghaving a central depressed diaphragm to seat on the internal ledge of a milk bottle or the like and a peripheral U-shaped housing to cover the pouring rim of the bottle.

An object of the invention is to provide a die of the above type having novel andimproved' details of construction and features of operation.

A more specic object is to provide a `die of the above type rin which air pressure is used for imparting the final forming pressure to the cap.

Anotiher object is to provide a die of the above type which is adapted to o-perate in the commercial lproduction of caps for long periods of time without repairs or adjustments.

Various other objects and advantages will be apparent as the nature of the invention is more fully disclosed.

Although the novelfeatures which are believed to be `characteristic of this invention are pointed out more particularly in the claims appended hereto, the nature of the invention will bebetter understood by referring to the following description taken in connection with the accompanying drawings in which a specific embodiment thereof has beenI set forth for purposes of illustration.

In the drawings:

' Fig. 1 is a side elevation of the upper die showing the supporting ram in section;

Fig. 2 is a side elevation of the lower die showing the supporting base plate in section;

3 is a longitudinal section through the upper die on an enlarged scale taken on the line 3-3-of Fig15;

Fig. 4 is a -longitudinal section through the lower'die on an enlarged scale taken on the line 4-4'of`liig. 6;

Fig. 5 is a transverse section through the upper die taken on the line 5-5 of Fig. 3;

` Fig. 6 is a transverse section through the lower die taken on the line 6-3 of Fig. 4;

Fig. '7 is a broken perspective viewillustrating a cap of the type which is formed bythe dies of the present invention; and

Figs. 8, 9,` and 11 are partial verticalr sections through the cooperating portions "of the upper and lower dies showing successive' stages in the cap-forming operation.

The die in accordance with the present invention is adapted to form a paper cap of the type shown in Fig. 7 which comprises a central depressedfdiaphragm I0 which is adapted to seat on the internal ledge of a milk bottle or ldh'e like, and pouring lip housing `I2 which is adaptedto extend over the pouring lip of the bottlef" The housing I2 comprises an inner vertical wall I3, a top wallA I4, and an outer skirt I5. The top'wall i4 is provided with raised beads or corrugations i6 which extend radially thereacross.' A capof this general type is disclosed more in detailV in MartinPatent No. 2,221,197 `dated November 12, 1940.

Referring to Figs. 1 and 2 an upper die 20 is shown as secured by suitable means in aram 2I which forms a part of `'dheforrriing pressand is adapted to be reo'iprocated vertically.

A lower die 3U is held in a sleeve 3l which is secured in a base plate 32 forming a party of the base of thepress 'The lower dieS is provided with a cap 33 which is'adjustablyv secured'to a base 32 which constitutes the bed of the press, by means vof a bolt 34, bracket 35 and boltsi3I which are threaded into" the base 32. The bolt 34 'is `provided with a spherical pressure fsurface 3l which equalizes the thrust upon the bolts- 36.

The upper-die 20, as `shown in Figs. Sand 5, comprises a shell '40 having a ca`p4I which is secured thereto and is properly aligned by pins 42 having surfaces 43 wihich enter bores 44`in the shell'i. l"The shell 40' and' shell cap 4Iform a cylinder 45'to which air under pressure is supplied through a port 45.

The' shelli carries a cylinder liner-4`ll (Figs.

f 8 to 11) in which a piston'48 slides. The piston 48 is preferably provided with 'oil grooves 49 and is sealedat the top by a `Cup packing 50l of suitable packing material such as rubber or leather and a compressible packing disc 5I `preferably of rubber which is secured and clamped by a pover plate `52 and a center screw 53. Lubrication is provided-by wicking54 which extends downwardly from the packing 50` and communicates withA anI oil groove 55.

The lower end of'the piston "48 is sealed'by suitable packing material 58 which is compressed in a packing' glandwby a cap'EB and a clamping bolt lill.

Anv upper diaphragm 'body cap (i5 is slidably mounted-in' the-liner 41'below'the piston 48- and is pressure sealed to? the cylinder liner by means of a cup-packing GS held against'the upper'diaphra'gm body Icap 65 by means'of a pressure'plate El and a'central screWGB. 'llhe plate `61 rests against an annular flangeBS formed-on the'lower piston cap 59.

The diaphragm bodyv cap is pinned to a diaphragn'il body 1U by means of pins-1I. The diaphragm body" 10 carries a diaphragm head 'I2 having a plurality of 4radially projecting'ns i13 provided with bottom surfaces 14 which are adapted to register with the corrugations on the top of the pouring lip housing I2 of the cap, and with an annular flange 15 having a lower surface 16 which forms the outer peripheral portion of the cap diaphragm I0. The head 12 is secured to body 10 by any suitable means such as pins 12a (Fig. 3).

A diaphragm plunger 80, having a lower surface 8| adapted to form the central portion ofY the cap diaphragm, is provided with a

sleeve

82,4

"sgary pressure for holding the cup |3I in its upper position against a shoulder |43 formed in the which slides in a suitable chamber 84 in the f5 The'shell I 38 carries a skirt sizing ring |50 hav- 1 .ing-.atop surface I5| which is adapted to size and diaphragm body and carries a cap 83 lwhich bears against a shoulder 85 of the body 10 to Vlimit the downward movement of the' diaphragm plunger 80. A spring 9| is seated within the chamber 84 of the diaphragm body 10 and bears against the cap 83 to press the diaphragm plunger 80 downwardly. An ejector pin 80 is slidably mounted in a bore in the diaphragm plunger 80 and is spring-pressed downwardly by means of a spring 89 which is seated against a shoulder 90 of the ejector pin and against the Icap 03.

An upper corrugation ring 95 is positioned around the diaphragm body 10 and is secured to the shell 40 by means of set screws 96. The corrugation ring 95 is provided with a plurality of vertical slots |0| which register with and are adapted to receive the fins 13 of the diaphragm head 12. A key 91 attached to the top of the corrugation ring 95 by a screw 98 rides in a slot 99 in the diaphragm body 10 for aligning the slots I0| with the fins 13. The lower surface |02 of the corrugation ring is adapted to engage and form the top surface I4 of the pouring lip housing of the-cap between the corrugations I8. A ring of soft material such as felt |04 surrounds the diaphragm body 10 and engages the corrugation ring 95 to clean the surface thereof and prevent any oil from dripping downwardly onto the cap being die-formed.

A skiving ring I I0, having a surface I I to form the outer skirt I5 of the cap, is held in a creasing ring II2 by means of a retaining ring |I3 which is locked by a set screw II 8.

The creasing ring ||2 is provided with a iluted lower surface ||4 .which is adapted to crease the outer portion of the cap blank to facilitate the folding thereof downwardly to form the skirt I5. The creasing ring ||2 is mounted on pins II5 which are positioned in the recesses 44 of the shell 40 and are held downwardly by springs ||6 which are seated between the top of the pins II5 and the pins 42 above mentioned. The pins I I5 are provided with shoulders I |1whichlimitthe downward movement of the creasing ring H2. Studs |20, secured from the bottom of the shell 40, bear against the top of the creasing ring ||2 for limiting the upward movement thereof and exerting the creasing and skiving pressures.

The port 46 is connected by means of a supply pipe I2| to a suitable source of fluid vunder pressure such as a compressed air tank not shown.

`shape'the bottom of the cap skirt I5. The sizing ring |50 is clamped to the shell |30 by means of A draw ring sleeve |60 is mounted to slide within thesizing ring |50 and at its lower end rests upon the upper surface of the cup I3I. A key ISI, secured by a screw I 53, enters a recess I 62 in the drawring sleeve for holding the latter in proper alignmentand` for limiting the movement of the sleeve when the cup I3I is removed for the purf' pose-of assembly. A draw ring |64 slides within the sleeve |60 and is provided with a top surface |65 which is' adapted to enter and shape the lower surface of the-top I4 .of the pouring lip housing I2 ofrthe cap.-- I f The draw ring |64 is provided with a lower flared surface IE6-which engages a corresponding vsur-face AY|61 of the draw ring sleeve |60 for limiting the downward movement of the draw ring |64;= The draw ring |64 is pressed upwardly by a plurality of pins lI 68 mounted in recesses formed partly in the draw ring sleeve |60 and partly ina diaphragm draw block |10 which is mounted to slide within the draw ring |64. Springs |69 insaid recesses bear against the pins |60 for urgingthe same upwardly; A stud |1I, carried by the draw ring |64 slides in a recess |12 in the draw-ring sleeve |60 for limiting the upward movementjof the ldraw ring I 64. The diaphragm draw block |10 is provided with anluppersurface |15 which is adapted to form the--under-surface of the cap diaphragm I0 and is held upwardly by means of a spring |16 which is seated within a recess |11 of said draw block and seatson a cap |18 which rests upon the top surface of the cup I3I. The cap |18 is secured to the draw ring sleeve |60 .by means of a retaining ring |19.

It is to be noted that the area of the top of the cup I 3| which is exposed to the air pressure within the cylinder-|42 is greater than the area of the top of the piston 48 which is exposed to the air pressure within the cylinder 45. Hence more force is required to depress the cup |3| against thisair pressure than is required to raise the piston 48.`

The successive steps in the formation of a cap will be better understood by referring to the successive positions shown in Figs. 3 and 4 and in Figs. 8, 9, 10 and 11, respectively. Figs. 3 and. 4 show the normal positions of the Various die parts before the start of the forming operation. It will be understood that the cap blank in the form offa flat disc is placed across the top of the lower alza-asas die `shown inFig. 4 and restsiuponltheadiaphragm draw blockl il -the draw ringil 641v and. .the creasing rin-g" 80.

1 As'v -therarn 2 If o'fy lig. i1.' brings .theupperrnie downwardly against -theefcap '=blank'-. the ejector? pin 88 is first retracted linto the uppersdiaphragm plunge'rf .80."1The 'upperfdiaphragm fplungerv 80 isL then "retracted into" th diaphragmheadi -12 against the lforce' oi- -the spring SLFJIheLIairpr-espiston 48 in its downward positions throughout this' stage of the'operationg' The "diaphragm plunger 80 and Vdiaphragm'-head. flange' 15a-'fare then forced' downwardly within 4the 'draw'ring J I 64 depressing Athefdiaphragr'n draw block |10l against the force of -thespring "|165"v The upperfcr'easing ring' 2| |-2=also ystrikes ythe-blank against. the lower creasing ring "1.80. tov l'crease' -theJ-.Jouter marginal portion oi thebl'ank' Z'llr'e'dies lare thenin the position shown in Fig. 8.. V Continued' downwardl mover-nent o iffthe .ram causes theris 13 of thedi'aphragm head 1.2 to push the paper ofthe cap downwardly against-the lowerfdravvringr 64 andfthreby retract theflower draw ring" 54' 'against-.fthe fdraw Vring `sleeve |50. The-draw block I 10 seats-upon vthe `cap |18 and thev pressure on the fdiaphragm plunger! 80xand diaphragm head 12 has lz cau'sed thefpistoni 48 to start "retracting' against' the air' .pressurein the cylinder- 45 as shown in-Fi'g. 9.

yContinued downward-.vmovem'ent ofethe ram from vthe position' f ffFig. 9.'causes the "piston 4B to be -iurther'retracted against the-'air pressure Within thecylinde'r |15` until tlie''ns 13 of the diaphragm-'head 12 enter. the slots |0I ofl the cor; rugation-ring 95^and engage-against theH body of the corr-ligation ring.- 'At the Sametime the studs I20 of the shell 40 engage the top `of the creasing ring ||2` arid force the-creasingring v`'| l2 andskivingring |'0 downwardly to fold and skivethe `outer portion of the` capV skirt I5 a's-fshown inliig. 10'.' -The parts of the upper fdie fare now locked by the corrugation' ring 95 again'stfurther movement relative to the 'shell 40Y and-continued downward movement of the ram and shell serves to depress the `dravv ringsleeve |60 and the draw block |10 against-theforce of :thel air pressure within the cylinder |42 as indicated in Fig. 11 until theskirt of the -cupv `|3| hitsand 'becomes rigid with the cap |32 of the lower-die'. A-Inasrnuch as the skiving" ring |50 is carried rigidly by the shell |30 the skiving ring is not depressed and accordingly serves to compact and form the'bottom ofthe -cap skirt |5- and to press the'capmaterial upwardlyinto the-'spacesin the slots |0| of the corrugation ring 95 below the ns 13, for compacting and forming the corrugations I6 of the cap. This constitutes the final forming operation.

When the ram is retracted the die parts return in the reverse order. The upward movement of the draw ring |64 with respect to the draw ring sleeve |60 serves to strip the cap skirt from the draw ring sleeve and allows the same to be readily removed from the lower die. The successive actions of the diaphragm plunger 80 and of the ejector pins 80 serve to strip the cap from the upper die and allow the same to rest between the two dies from which position it is removed by a dial plate not shown.

The use of air pressure in the cylinders 45 and |42 permits high operating pressures to be built up without acquiring the use of large springs which, in addition to complicating the apparatus, tend to break after a limited amount of use.

At thetsametime the 'difterential pressure. exerted on lthe pistonzand the .cup -|3| due tothe difierence's inrsiz'e` between4 the.. effective :surfaces thereof nprovideszior: the: proper .operating sequence of the parts.

Although a .specifictiembodiment oi` the: invention has been shown it is to be understood thatnthe'ifinvention is .Y capable of various uses andithat changes-,.andf adaptations vmay. be made therein as.will,ben.readily apparent to a .person skilledf inthefartp The vinvention is only to be restricted ini aaccordancef withxthe .following claims.

What is claimed is:

1i. Andie .for forming' paper caps: orthe like having a 'centralf depressed vdiaphragm portion anda peripheral inverted container rim housing, said 'die comprisingr upper and'lower die members mounted dior trelativ'e forming and returnmovements and'including upper-.and lower diaphragm formingv members, ,conforming tothe depressed capi diaphragm, a' lowerV draw 'ring conforming to the inside surface of the peripheral rim housing;N andzzani:upper` pressure ring conforming to the atopfawall' of said'frim housing; said upper and lower :diefmembers eachhaving a shell forming at.fcompressedu'airl cylinder; `pistons in said cylinders" toYV :moveevertically': against the air pressureltherein, means -mounting vsaid upper rdiaphragm: forming member tov vmove with said upper :pistorLfmeans -mounting said upper pressure ring to move'with: said .upper "die shell, vmeans mountingy said-flowercdiaphragm forming member and :sai-d lower drawring to move with said lower@die-piston:r at-xleast inthe final forming stage, said upper. apiston' having-.an effective area lessithan that of4 said lower piston whereby the upper diaphragm forming'memberrst cups the blankv to .formi @the` depressed cap diaphragm and isvv then=retracted against the air pressure in the upper shell cylinder-While the'upper shell feeds theupper pressurefring against, the cap blank, and the lower diaphragm forming memberand lower `drawl ring'fare then retracted against the air-1' pressure irrfthelovver shell cylinder by the pressure of the'upper pressure ring in the final formingrstage. l 2. Audie` as set-forth in claim 1 in which said lower-.pistoncomprisesian inverted cup having a'dependin'g vskirt sliding in said lower shell cylinder anda` xedhead attached to said shell closes the flower end of 'said cylinder,- `said head having an airduct to supply :compressed air to saidv cylindex'.

3. A/'dief as vsetviorth in claim v1 in which `said lower-piston comprises an inverted cup having a depending skirt sliding in said lower shell cylinder and a fixed head attached to said shell closes the lower end of said cylinder, said head having an air duct to supply compressed air to said cylinder and packing means carried by said head to seal against the inner wall of said depending piston skirt.

4. A die as set forth in claim 1 in which said lower diaphragm forming member is spring mounted on said lower piston to be retracted in response to pressure exerted by said upper diaphragm forming member for cupping and drawing the cap diaphragm prior to retraction of said lower piston against the air pressure in the lower shell cylinder due to the pressure applied to the blank by said upper pressure ring.

5. A die as set forth in claim 1 in which said upper diaphragm forming member comprises a 5 head rigidly mounted with said upper piston to form the inner vertical wall and atleasta portion ofthe top wall of the rim housing of .the cap, and a central diaphragm plunger slidably mounted in said head and spring pressed downwardly to engage the cap blank and' to be retracted into said head prior to the cupping operation.

6. A die as set forth in claim 1 in which the upper piston carries packing to'form a pressure seal with said upper cylinder and said upper diaphragm forming .member is provided with a head slidable in said upper cylinder and engaging the lower end of said upper piston rto be actuated therewith.

7. A die as set forth in claim l in which the upper piston carries packing to form a pressure seal with said upper cylinder and said upper diaphragm forming member is provided with a head slidable in said upper cylinder and engaging the lower end of said upper piston to be actuated therewith, said head also having packing means forming a pressure seal with said upper cylinder.

8.' A die for forming paper caps or the like having a central depressed diaphragm portion and a peripheral inverted U-shaped container rim housing having an`inner vertical wall; a top wall and an outer depending skirt,` said die comprising upper and lower die members mounted for relative forming and return movements and including upper and lower diaphragm forming members conforming to the depressed cap diaphragm, a lower draw ring conforming to the inside surface of the peripheral rim housing, an upper pressure ring conforming to the top wall of said rim housing, an upper skiving ring conforming to the outer surface of the cap skirt for skiving and forming'the same, a lower sizing ring adapted to extend between said skiving ring and said draw ring to exert die-forming pressure on the lower edge of the cap skirt, said upper .and lower die members each having a shell forming a compressed air cylinder, pistons in said cylinders to move vertically against the air pressure therein, means mounting said upper diaphragm forming member to move with said upper die piston, means mounting said upper lpressure ring and said skiving ring to move with said upper die shell at least in the'iinal forming stage, spring means mounting said lower' diaphragm forming member to move with said lower die piston at least in the final forming stage, means mounting said lower draw ring on said lower piston, and means mounting said sizing ring on said lower die shell, said upper piston lhaving an effective area less than that of said flower piston whereby' the upper diaphragm forming member rst cups theblankto form the depressed cap diaphragm and is then retracted against the air pressure in theupper shell cylinder whilethe upper shell actuates the upper pressure ring and the skiving ring, and the lower diaphragm forming member is depressed against its spring mounting to cup the blank prior to retraction ofthe lower draw ring against the'` air pressure in the lower shell cylinder in the'lnal skirt sizing stage.

9. A die as set forth in lclaim 8 in which saidlower piston comprises an inverted cup havingv a depending skirt sliding in said lower shell cylinder and axed head attached to said shell closes the lower end of said cylinder, said head having an air duct to supply 'compressed air to said cylinder'and packing means carried by said head to seal against the inner wall of said depending piston skirt.

10. A die as set forth in claim 8 in which said upper diaphragm forming member comprises a head rigidly mounted with said upper piston to form 'the' inner vertical wall and at least a portion of the top wall of the rim housing ofthe cap, and a central diaphragm plunger slidably mounted in said head and spring pressed downwardly to engage the cap blank and be retracted into said head prior to the cupping operation.

11. A die as set forth in claim 8 in which the upper piston carries packing to forml apressure seal with said upper cylinder-and said upper diaphragm forming member is provided with-a head slidable in said upper cylinder and engaging the lower end of said upper piston to be yactuated therewith, said head also having packing means forming a pressure seal with said upper cylinder. l

12. A die as set forth in claim 1 in which the lower draw ring comprises an outer sleeve and a. head slidable therein, said liead lconforming to the inner and top walls of the cap rim housing and being spring pressed upwardly to stripthe cap skirt from said-sleeve. v

, CARL W. GOODWIN.

KENNETH R.- ALLEN.

REFERENCES CITED The following references are of record in the le of this patent:

y UNITED STATES PATENTS Number l Name Date 2,250,450 Faber July 29, 1941 2,325,161 l Goodwin et al July 27, 1943