US2891366A

US2891366A - Hydraulic container sealing means

Info

Publication number: US2891366A
Application number: US615587A
Authority: US
Inventors: Harry E Stover
Original assignee: Anchor Hocking Glass Corp
Current assignee: Anchor Hocking Glass Corp
Priority date: 1956-10-12
Filing date: 1956-10-12
Publication date: 1959-06-23
Anticipated expiration: 1976-06-23

Description

June 23, 1959 H. E. STOVER 891566 HYDRAULIC CONTAINER sEALING MEANS Filed oct. 12. 195e s sheets-sheet@ Jun@ 23 1959 H. E. STOVER HYDRAULIC CONTAINER SEALING MEANS s sheets-sheet 2 Filed Oct. l2. 1956 IN V EN TOR. #4f/ey I 57ans? E n.1! s 1 w m -wms smmwyw FI w F I v/ KZ/ A v 4 5 V//////// f// s v\ mw m a m 9 m o m mwf m m s f f/l/ \W./M m m. U 4. w/

Jun 23, 1959 H. E. STOVER HYDRAULIC CONTAINER SEALING MEANS 5 Sheets-Sheet 3 Fillgd oct. 12. 195e L. N W O. l

United States Paten-t 15' 2,891,366 Patented June 23, 1h59 2,s91,366. im nAULrc coNTAn n SELING iviunlsis Harry E. Stover, Lancaster, Ohio; n'ssignor to Anchor Hocking GlassjCorporation, Lancaster, '0hio; a corporation of Delaware Application october '12;1956; sni N; 615,587 15 Claims. (cuss-e561).

The present invention yrelates to maczliines` for applying closures Vto containersj and moregpaifticularlyl to such a machine embodying a hydraulic chuck orsealing head for applying a closure to 'a screw thread or lug-'type container. t y -A Screw-type closures are `desirable on many ltypesof packages and particularly onQfoofd containers such as ketchup, jam, or powdered colfe'e" containers', where the user opens and reseals the container many over a period of time. For such containers', a screwk thiie'a'd offers a practical closure fastening means as the closure is easily reapplied after the' initial opening` to provide a relatively airtight seal for the intervals between use. One drawback with regard to screw closures eiiists` in the relative difhculty encountered in the initial! application of the closure onautomatic sealir'ig'':inachines.` Arto matic sealing machines for use 'With sc'rev'v' closures have been unsatisfactory as they, eitherrus'e cem'pleX rotating chuck arrangements or they have hydraulic or mech-aical closure shaping means adapted foruse only on relatively thin and easily shaped 'closure shells.

It is known to fix screw-type closures on bottles by means of an apparatus in which `a membrane is forced around the cap on the container neck by hydraulicfrce to press the cap into conformity with the container neck. The present invention provides an impved hydraulic device which will deform a selected portion of tc'losur'e to conform it` to a container finish such as a threaded finish `and which is capable of -frm'ingthreadsor lugs on a metal closure formed of` heavy gauge metal.

Accordingly, an object of the present invention is to provide an improved' sealing means for screw-type closures.

Another object of the present invention is to provide an improved hydraulically operated sealing machine.

Another object of the present-invention is to. provide a sealing means for screw-type closures adaptec'l [for high- Y speed operation.

Another object of the present invention-istey provide an improved hydraulic sealing head'` for applying screwtype closures. Y

Another object of the present invention is to provide an improved hydraulic sealing` head adapted for auto matic sealing machines. o

Other and further objects of the invention-willi. be obvious upon an understanding of the illustrative'em- Figi. 2 is an elevational view in section of the sealing head oli-Fig. 1 with the hydraulic' pressure applied;

Fig. 3y is apersp'ective view of the resilient closure shaping ring;

Fig: 4 is a perspective view of a closure before'it is threaded; Y Y

Fig; 5 is a perspective View of thek closure of Fig. 4 after it has been shapedby the sealing head* during the container sealing action; l n t t Fig.v- 6 is* a fragmentary sectionalview of a sealing head'iriu'nted on a turret-type'automatic sealing ma'-v chine; t

Fig. 7 is a sectional view of the sealing head of Fig. 6 with the hydraulic pressure applied;

Fig. 8` is a sectional view of the valve taken along lline 8"-8of-Fig'; 6; and

Fi'g; 9 is a fragmentary view of another embodiment of the'turre't-t'ype hydraulic sealing machine.

Ai preferred embodiment of the sealingr head 1 conrprisig the hydraulic chuck 2 and the support means 4 therefor is shown in Figs. n 1-3.

The cup-like hydraulic chuck 2 receives the mouth of a filled container 7v having anun'threaded closure 8 placed loosely thereon. Whilel holding the washer 8a of closure' 8 tightly against the mouth of the container 7 the chuck 2"st`1ue`ezes closure 3 to formthreads 11 therein (Fig. 2) which are complementary to container threads lllso ythat theclosiiie Sis fastened onto and seals the c0n` tainer 7. l

Thesi-ipport means 415er' chuck Zcomprises a suitable r'dSconn "cted by threads d Vto the hydraulic chuck 2 and irlioed von a suitable holder (not shown). n Y

IFig'; l, ayer'tically"v reciprocal ycontainer support 12 is shovvhfwhich is used to raise V'the topv of the container within the hydraulic chuck 2l after the closure 8' has been placed'on the container 7.` lf desired, the container maybe placed on a stationary support and the hydraulic chuck' support meansV 4 may be reciprocated vertically onto-thel container 7. Closure 8 may also be inserted intotlie hydraulic chuck 2' rather than being placed on the container mouth if desirable.

The hydraulic chuck 2 comprises a closure sealing member 14' threadedly connected at its top by threads 6' tothe rod'Sand having an kannular bodymember 15 moruntedthe'r'eon. A resilient closure shaping means is held placebetween theclosure seating member 14 andthe body ymemberl byf a cap 17 threadedly confA meetejd to the body member 15. n K

Ther 'closure shaping means 116 isv formed of a resilient material such as rubber and it has a radially inwardly teding closure shaping ilange 19 kin its hollow Vcenter pr't'io Z0. An annular aperture 21 is provided within the body of shaping'means; 1'6 encircling the ang'e 19 and adptedto be lledwith hydraulic fluid under lgiressulre'.l The" hydraulic iii-iid expandsY the aperture Zi to cause shaping means 16 f6 erpand'inwardiy into the Hollow center "portion 20V so that its shaping lng`e19 engages bodiment about to be described, or will heindicated in :1p

the appended claims, and Various advantages not referred to herein will occur to oneskilled inV thev art upon employment of the invention in practice:

A preferred embodiment of ther invention has been' chosen for purposes of illustration and description and theclo'sure 8 on container 7. Sufhcient hydraulic p'r'es sure isfapplied'witiin the aperture 2i so that the hnge 1.9"force'sv Athe closure skirt 9 inwardly against thethre'ad's 10ron the top' of the container-7 to form the thread' 11 onthe closures which is complemen't'ary tothecoiitaier threadl'; Fig. 4 shows thegeneralshapeofa suitable closure. cap before the:i formationi 'of` the threads 11 and Fig: 5 shows the'clsue threads llfo'rmedby the squeezing; action of flangeV 19:- Theresilient shaping means'f 16 'in'A its preferred forni is' held in positininthe hydraulic chuck 2f by outer andinnerflangesZZ andf23; respectively;u formed at the upper.' edge of' theshaping meansv 16;' The inner flange 23 Yis tightly grippedrbetwe'en corner 24 on body member v15 and 'a lockingange' on the closure seating member 14; The outer flange-22 is locked between corner 26 in the body member 15 and a locking ring 27 held in place by the cap 17. The upper portion of the aperture 21 in the resilient shaping means 16 is left open so that it communicates with an annular hydraulic uid conduit 28 formed in the body member 15. Conduit 28 distributes the hydraulic uid to the aperture 21 in the closure shaping means from a suitable inlet port 29.

In order to limit the expansion of the resilient closure shaping means 16 to a radially inwardly directed motion of the iange 19, the top and bottom portions 38 of the shaping liange 19 are confined between the

spaced extremities

31 and 32 of the closure seating member 14 and the cap 17, respectively. Thus, all the outer surfaces of the resilient shaping means 16 are conined against expansion with the exception of the shaping surface 34 of the shaping ange 19. When hydraulic uid under pressure is admitted through the conduit 28 into the aperture 21 of the shaping means 16, the shaping ange 19 is forced radially inwardly against the skirt 9 of the closure 8 as seen in Fig. 2, thereby shaping a cylindrical portion of the skirt so that it conforms to the threads on the container 7. By providing the inwardly extending shaping ange 19 and by controlling its deformation with the

spaced extremities

31 and 32, the shaping force on the closure 8 is concentrated in the particular area desired so that the thread is formed in the patricular portion of the skirt desired. Also, by limiting the shaping area to a relatively narrow portion of the closure skirt, it is possible to form threads in closures formed of relatively thick metal quickly and eiectively without distorting the remaining unthreaded portions of the closure.

In addition to forming threads on the closure skirt, it is also desirable in many instances to form a step or groove at the outer edge of the upper surface of the closure to reinforce the closure and to move the closure gasket 8a tightly against the sealing finish of the container mouth. A shaping flange 36 is provided on the lower contacting surface of the closure seating member 14 to perform this shaping operation. When the hydraulic chuck 2 receives the closure 8 atop container 7, chuck 2 and container 7 are moved together with suiiicient force so that the flange 36 of the closure seating member 14 shapes the top 37 of the closure to provide the step 38 at the edge of closure top 37 as seen in Fig. 5.

In order to assist in separating the hydraulic chuck 2 from the sealed container 7 after the threading operation is completed, an ejector rod 40 is provided in the closure seating member 14. Ejector rod 40 is slidably mounted in a suitable bearing 41, and it is urged downwardly against closure 8 by coil spring 42. The downward travel of the ejection rod 40 is limited by a suitable stop nut 44.

Any suitable means may be used to supply hydraulic uid under pressure to the aperture 21 of the shaping means 16 after the hydraulic chuck has been lowered into place onto the container 7. In Fig. l a hydraulic cylinder 45 is shown connected by a hydraulic line 46 to to the inlet port 29. A rotating cam 47 turned by hand or by a suitable drive mechanism intermittently raises the piston 48 of the hydraulic cylinder 45. The rotation of cam 47 may be synchronized with the operation of the container support 12 by a suitable connecting means (not shown) to cause the piston 48 to be raised to apply pressure for a predetermined period to the shaping means 16 while the container support 12 is in its raised position.

Another embodiment of the sealing head is shown Vin Figs. 6-8 which is adapted for being mounted on a turret-type sealing machine such as is disclosed in the United States Patent No. 2,610,779, owned by the assignee of the present invention. The sealing machine disclosed in Patent No. 2,610,779 has a rotating turret containing a plurality of spaced sealing heads which are intermittently lowered over the mouths of containers traveling on a circular conveyor located beneath and moved in Synchronism with the sealing heads. Fig. 6 shows one such sealing head 50 having a hydraulic chuck 51 mounted on its lower end in accordance with the present invention. Sealing head 50 is attached to the outer edge of the rotatable sealing turret 52 in place of the sealing heads shown in the above-mentioned patent. As the turret 52 is rotated above containers 54 being moved therebelow by a suitable conveyor as described in the above patent, sealing head 50 is alternately lowered by the cam 71 and raised by the cam 60. When the sealing head 58 has lowered the hydraulic chuck 51 over the mouth of the container 54, a closure 66 is forced tightly against the container mouth and is sealed thereon by the squeezing action of the hydraulic chuck 51, as will be more fully described below.

The sealing head 50 comprises an outer casing 5S bolted to the turret 52 and an elongated hollow member 56 slidably mounted therein on bearings 57 for vertical movement with respect to the turret 52. The lifting of the elongated hollow member 56 within the outer casing 55 is controlled by a cam roller 58 rotatably mounted on the hollow member 56 on pin 59. When the hydraulic chuck 51 is to be raised-clear of the container 54, the cam roller 58 engages the upper surface of a cam 60 which is xedly mounted on the turret shaft 61 and which is shaped to raise the hydraulic chuck from the container after the shaping action. A coil spring 62 mounted between the lower end 64 of the outer casing 55 and flange 65 on the lower end of hollow member 56 urges the hollow member 56 downwardly and urges the cam roller 58 towards cam 60.

In order to move the sealing head 50 downwardly against the closure 66 on the container 54 with sucient force to provide a tight seal, an elongated rod 67 is slidably mounted on suitable bearings 68 within the hollow member 56. A cam roller 69 is mounted on a suitable shaft 70 at the top of the rod 67 and it engages the lower surface of a circular cam 71, which is tixedly mounted on the turret shaft 61. Cam 71 lowers the rod 67 and attached hydraulic chuck 51 against the force of a coil spring 72, which is compressed between the cam wheel bracket 74 at the upper end of rod 67 and the top 75 of the outer casing 55. The hydraulic chuck 51 is mounted upon the lower ends of both the rod 67 and the hollow member 56, as will be described more fully below, so that the chuck S1 is moved upwardly by the combined action of cam roller 58 on cam surface 60 and the coil spring 72 and is moved downwardly by the combined action of cam roller 69 on cam 71 and cam spring 62. As seen in Fig. 6, when the hydraulic chuck 51 is forced downwardly against the closure 66 by cam 71 and cam roller 69, the cam 60 is shaped to clear cam roller 58 so that cam 60 does not impede the lowering of the hydraulic chuck 51. Similarly, cam 71 terminates before the cam 60 raises the hydraulic chuck 51 clear of container S4 so that cam 71 does not interfere with the raising of the hydraulic chuck 51.

The hydraulic chuck 51 is shown in detail in Fig. 7. The hydraulic chuck 51 comprises a closure sealing member threadedly connected to rod 67 at its top by threads 81 and having an annular body member 82 mounted thereon. A resilient closure shaping means 84 is held in place between the closure sealing member 80 and thc body member 82 by a cap 85 threadedly connected to the lower portion of the body member 82. Closure shaping means 84 is formed of a suitable resilient material such as rubber in generally the same manner as the abovedescribed closure shaping means as illustrated in Fig. l. Closure shaping means 84 as illustrated in Figs. 6 and 7 is a different embodiment (from the resilient shaping means 16 illustrated in Fig. l as its annular closure shaping liange 86 is located centrally 0f the hollow inner portion of the shaping means and as its mounting

flanges

87 and 88 are mounted at the top and bottom, respectively, of its 'outer surface. The closure shaping means 84 is held inpositionbetween the closure shaping-member 80 and the cap 85 by an annular retainingring 89 which has inwardly directed upper and lower flanges 90 and- 91, respectively, which engage the upper andV lower anges 87 'and 8S of the closure shaping means and hold them in position against the closure sealing member and the cap 8S. The annular retaining ring 89 and the closure shaping means 84 cooperate to form an annular hydraulic channel 92 surrounding the central portion of the closure shaping means 84 and its inwardly directed closure shaping ilangev 86. Channel 92 communicates with a hydraulic inlet port 93 through an annular hydraulic distribution channel 94. Thus, after the hydraulic chuck 51 is lowered over the top of a container S4 with a closure 66 in place thereon, the admission of fluid under pressure to the channel 92 causes the central portion 95 of the closure shaping means Sito move inwardly toward. the retaining surfaces 96 and 97 of the closure sealing member 80 and the cap 85, respectively, and also causes the closure shapingange $6 tosimultaneously move inwardly against the skirt 96 of the closure 66 to press it against the threads 99 on top of the container S4. Threads 100are formed on skirt 9S of closure 66 to fasten the closure 66 in sealing position on the container 54. When the hydraulic pressure is released by the hydraulic control system, which will be more fully described below, theresilient closure shaping means {i4-*resumes its original shape as seen in Fig. 6, allowing the hydraulic chuck 51 to be raised vertically above the top of the sealed container 54. Ejector 4rod 101, which is slidably mounted in a suitable bearing 102 in-the closure sealing member 80, is urged downwardly by vcoil spring 104 to help separate the closure cap 66 from the chuck 51. The downward travel of the ejector rod 101 is controlled by a nut 105.

vIn the sealing machineV disclosed in the above-mentioned Patent No. 2,610,779, a closure feed means is disclosed which supplies the closures to the sealing heads prior tothe lowering of the sealing heads 50 onto the containers 54. The sealing means shown in Patent No. 2,610,779 presents the closures to the sealing head in such a position that the closureis drawn upwardly into the lower portion of the sealing head by a magnet mounted therein. A magnet 106 is provided in the ejector rod 101 of the hydraulic chuck 51 of the present invention for this purpose. Where the closures 66 are madeV of steel or another magnetic substance, the magnet 106 draws the closure 66 upwardly into the hydraulic chuck 51 in the same manner as disclosed in the Patent No. 2,610,779 prior to the lowering of the hydraulic chuck 51 over the topof the container 54. If desired, the cap 66 may be inserted in hydraulic chuck 51 by hand or applied directly to the container 54 rather than to the hydraulic chuck S1 prior to' the lowering. of the chuck 51 over the top of the container. Vlosure 66 maybe placed on the container top by hand or'by a suitable automatic closure applyingV means such asisshown inPatentNo. 2,618,424, which is assigned to the assignee of the present invention. During the rotation of the sealing turret 52 about its centralV stationary mounting shaft 61, it is desirable to have the hydraulic shaping fluid automatically applied to the hydraulic chuck '51 for a predetermined interval while the' chuck 51 is lowered by cam 71 into sealing engagement with the closure 66 on container S4. A preferred embodiment of an automatic hydraulic control means or valve 111i is shown in Figs. 6 and 8. Valve 110 comprises a lower annular connector ring` 111 xedly mounted by bolts 112 to the turretshaft 61 and having an annular upper surface 114 in sliding engagement with anannular rotating ring 115 which is connected tothe rotating turret 52. As seen in the sectional View in Fig. 8, the connector ring 111 has an elongated channel 116 therein whichis connected to a source of hydraulic iluid under pressure by a line 117. The rotating ring 115 has a series of spaced vconnector ports 1.18, each one of which is coupled to one of the hydraulic chucks 51by a flexible conduit-119. When the port 118 is moved into kcommunication with the channel 116 by rotation of the turret 52, lhydraulic iluid from the line 117 ows into the hydraulic channel 92 of the hydraulic chuck 51 through channel 116, port 118,' line 119, inlet port 93, and distribution channel 941. During the portion of the rotation of the turret 521m which the port 11S is above channel 116, the hydraulic pressure of source 117 is applied to the closure shaping means 84 to perform the above-described shaping operation. After the port 118 passes beyond the channel 116, it moves above a release channel 120 in connector ring 111 which is connected by a line 121 to a hydraulic uid reservoir at atmospheric pressure, allowing the pressurewithin the hydraulic channel 92 to return to normal and allowingthe closure shaping means 84 to assume its normal position as shown in Fig. 8.

In place of the hydraulic control means 110, a separate hydraulic pressure means may be provided for each sealing head 50, as shown in Fig. 9. Thus, a hydraulic cylinder 13.0, similar. to cylinder 45 of Fig. 1, is mounted for rotation with the turret 52 on each sealing head 56 and is hydraulically connected to the hydraulic chuck 51 by line 131. The piston 132.01 the hydraulic cylinder is moved by a suitable Acam surface 133 lixedly mounted on the turret .shaft 61 so that the piston 132 is moved downwardly into the hydraulic `cylinder during the desired portion of the sealing heads movement about shaft 61 to apply shaping pressure to the hydraulic chuck 51.

The operation of the hydraulic chuck illustrated in Figs. l through 3 which has been described in connection with the above descriptions may be summarized as follows:

Container 7 is first placed on a suitable container support 12 with a closure 8 loosely positioned on its top. Thereafter, the container support 12 is raised to move the upper portion. of the container 7 together with the cap 8, which isseated thereon, into the hydraulic chuck 2 of the sealing head 1. As seen in Fig. 1, the closure 8 is now positioned within the hollow center portion of the cup-like hydraulic chuck 2, and the lower portion of the skirt which is adjacent to the threads 10 on the closure finish ispositioned opposite the resilient closure shaping means 16lwithin the hydraulic chuck2. The container support 12 forces the container 7 and closure 8 thereon upwardly against the closure seating member 14 with suflicient force so that the washer 8a is tightly seated against the mouth of the container 7 and so that shaping flange 36 of the closure seating member 14 forms the step 38 at the outer edge of top 37 of the closure 3. While the closure 8 is held tightly against the closure seating member 14, the cam 47 is rotated to move piston 48 upwardly, thereby forcing hydraulic fluid into the aperture 21 of the resilient closure shaping means 16 to force the shaping flange 19 tightly against the skirt 9 of closure 8 so that it is forced against the threads 10 of the container to form complementary threads 11. Threads 11 engage the kthreads 10 of the container 7 and hold the closure tightly in place on the` container 7 in sealing position. Thereafter, further rotation of cam 47 lowers piston 43 to release the hydraulic pressure on the shaping liange 19 so that the resilient closure shaping means 16 returns to its normal shape as seen in Fig. 1 and so that the container support 12 may be lowered to remove sealed container 7 from the hydraulic chuck 2. Ejector rod 411 moves. downwardly under the force of coiled spring 42 to assist in the withdrawal of the closures 8 from the hydraulic chuck 2. Container 7 is now sealed with threaded closure 8 which may be removed and reapplied as desired by the consumer of the product packed in container 7.

The operation of the embodiment of the hydraulic chuck shown in Figs. 6 through 8 on a rotating turrettypesealing machine such as that disclosed in Patent No. 2,610,779 may be summarized as follows.

Sealing heads 50 as seen in Fig. 6 are mounted in spaced relation on a rotating turret as disclosed in the above-mentioned patent. During the initial portion of the turret rotation, a cap feeder as shown and described in the above-mentioned patent supplies a closure 66 to the hollow cup-like hydraulic chuck l mounted on the bottom of each of the sealing heads 5t). Further rotation of the sealing heads 50 by the turret 52 brings the hydraulic chuck 5l above a iilled container 54 carried by a suitable table or conveyor on a path directly beneath the circular path of the sealing head 50. Further rotation of the sealing head Si) now brings its cam roller 69 into contact with the circular cam '71 thereabove which lowers the hydraulic chuck 51 onto the container 54 so that the closure 66 is positioned on the top of container S4 with its sealing washer 66a tightly pressed against the container mouth. During this portion of the turret rotation, cam 60 is shaped so that it passes below the cam roller 58 so that the cam roller 58 does not interfere with the downward motion of the sealing head Si). Additional rotation of the turret next brings the connector port liti into communication with the hydraulic channel 116 in the connector ring lill of valve 110 so that hydraulic fluid under pressure is admitted through line 13.9, port 93, and distribution channel 94 to hydraulic channel 92. The hydraulic fluid under pressure in channel 92 forces the closure shaping liange S6 of the closure shaping means 84 inwardly against the skirt 93 of the closure 66 and forces the skirt 98 against threads 99 of the container finish to form threads illl on the closure 66. Additional rotation of the turret brings the connector port M8 above the release channel mi) in the connector ring 111i of the hydraulic valve 110, thereby releasing the hydraulic pressure on the shaping means 84e so that it returns to its normal position as seen in Fig. 6. Thereafter, cam o@ engages cam roller 58 to raise the sealing head 50 clear of the sealed container and the sealed container is carried out from under the turret S2 to a suitable unloading station. Circular cam 71 terminates before the cam 6% engages cam roller 58 so that cam roller 69 will not interfere with the raising of the sealing head 50 by cam roller 58.

In the embodiment shown in Fig. 9, the hydraulic shaping pressure in each hydraulic chuck 51 is applied by the downward movement of piston 132 under the control of cam 134 at the desired portion of the turret rotation.

It will be seen that an improved hydraulic chuck is provided which is relatively simple in form and which is, at the same time, effective in sealing containers by forming screw threads in closures applied to container tops. The hydraulic chuck disclosed is adapted for use on automatic sealing machines and provides a means for sealing screw-type containers simply and effectively and at high speeds. The hydraulic chuck of the present invention is also useful on closures formed of relatively heavy-gauge metal, and the molding operation of the chuck may be confined to predetermined relatively narrow portions of the closure skirts where it is desired to provide deep screw threads over a narrow portion of the container skirt to form an attractive and eiective screwtype seal. The hydraulic chuck of the present invention is also readily adjusted to handle screw closures of varying shapes and sizes and thread patterns by a relatively simple exchange of a few of its elements.

As various changes may be made in the form, construction and arrangement of the parts herein without departing from the spirit and scope of the invention and without sacricing any of its advantages, it is to be undei-stood that all matter herein is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim:

l. In a sealing machine having a rotating turret with a plurality of sealing heads mounted thereon, the combination of a cup-like member on each of said sealing heads having a resilient hollow shaping means therein adapted to embrace a closure and to squeeze it into conformity with a container nish when subjected to hydraulic pressure, said resilient hollow shaping means having a ring-like inner portion extending radially inwardly of said cup-like member, an annular conduit encircling said inner portion of said resilient hollow shaping means and connected to a hydraulic supply means, a hydraulic supply means comprising a control member adapted for connection to a source of hydraulic fluid under pressure and operatively connected to the turret to periodically connect the source of hydraulic fluid to the annular conduit of one of said resilient hollow shaping means for a portion of the turrets rotation.

2. In a sealing machine having a rotating turret with a sealing head mounted thereon, the combination of a cup-like member on said sealing head having a resilient hollow shaping means therein adapted to embrace a closure and to squeeze it into conformity with a container nish when subjected to hydraulic pressure, a hydraulic supply means comprising a control member adapted for connection to a source of hydraulic uid under pressure and operatively connected to the turret to periodically connect the source of hydraulic fluid to said resilient hollow shaping means, said control member comprising a stationary member, a movable member connected to said turret for rotation therewith, said stationary and movable members each having a contact surface, said contact surfaces being in sliding engagement with one another, a first aperture on the contact surface of the stationary member adapted for connection to a source of hydraulic fluid under pressure, and a second aperture on the contact surface of the movable member adapted for connection to the resilient hollow shaping means and positioned to communicate with the first aperture for a predetermined portion of its travel over the contact surface of said stationary member.

3. The sealing machine as claimed in claim 2 in which one of said apertures comprises a channel having an elongated shape in the direction of travel of the other aperture whereby hydraulic iiuid from the source is admitted to the hollow shaping means for a period proportional to the length of said channel.

4. In a sealing machine having a rotatable turret, the combination of a hollow hydraulic member mounted on said turret and having a resilient annular shaping means mounted therein, a conduit in said hydraulic member encircling at least a portion of said resilient annular shaping means, a hydraulic pressure generator mounted on said turret and hydraulically connected to said conduit, and actuator means operatively connected to said hydraulic pressure generator to actuate it for a portion of the turret rotation to subject said conduit and said shaping means to hydraulic pressure.

5. The sealing machine as defined in claim 4 in which said hydraulic pressure generator comprises a pump having a piston operatively engaging a stationary piston control cam on said sealing machine whereby rotation of said turret moves said engaging portion of said piston along said cam.

6. A sealing head for a sealing machine comprising the combination of a cup-like hydraulic chuck, a resilient shaping member mounted Within said hydraulic chuck encircling the cavity therein and having a ring-like inner portion extending radially inwardly of said cavity, an annular conduit encircling said inner portion of said resilient shaping member and adapted for connection to a source of uid under pressure whereby the admission of fluid under pressure into said conduit forces said inner portion of said shaping member radially inwardly of the hydraulic chuck cavity.

7. The sealing head as claimed in claim 6 in which said ring-like inner portion of said shaping member comprises a radially directed ange having radially directed top and bottom portions, and said hydraulic chuck has spaced extremities engaging said top and bottom portions to limit the ange to movement in a radial direction.

8. A hydraulic chuck for a sealing machine comprising the combination of a resilient annular shaping member having a shaping flange on its inner surface extending radially inwardly thereof, spaced mounting anges on said annular shaping member, a mounting means for said shaping member adapted to engage said anges to mount said annular shaping member and to form a conduit therewith, and a hydraulic port in said mounting means communicating with the conduit at one end and adapted for connection to a source of hydraulic fluid at its other end.

draulic port in said mounting means communicating with said conduit at one end and adapted for connection to a source of hydraulic fluid at its other end.

10. A sealing head for a sealing machine comprising the combination of a cup-like hydraulic chuck having a cavity adapted to fit over a closure shell on the mouth of a container, an annular aperture in said hydraulic chuck encircling the cavity and having a ring-like portion in communication therewith, a resilient shaping member in said aperture and occupying the ring-like portion of said aperture communicating with the cavity, a shaping ange on the resilient shaping member eX- tending radially inwardly of the chuck cavity, and said aperture adapted to communicate with a source of uid under pressure whereby the admission of uid under pressure into said conduit forces the shaping ange of said shaping member radially inwardly of the hydraulic chuck cavity against the closure shell.

11. The sealing head as claimed in claim 10 which further comprises a closure seating member positioned above the cavity in the hydraulic chuck and adapted to contact the closure top to hold the closure tightly against the container mouth.

12. The sealing head as claimed in claim 11 in which said closure seating member has a shaping ange on its surface adapted to shape the closure top.

13. A resilient shaping member for a hydraulic chuck comprising a resilient annular body member having a radially directed shaping flange on its inner edge and having spaced ring-like mounting flanges outwardly of said shaping flange adapted for engagement with mounting anges on the hydraulic chuck to fasten the shaping member thereto and to form a conduit between the body portion and the hydraulic chuck.

14. The resilient shaping member as claimed in claim 13 in which said body member has a U-shaped cross section and said mounting flanges are positioned at the opposite top edges of the body member.

15. The resilient shaping member as claimed in claim 13 in which said spaced mounting anges are located at the top and bottom of the outer edge of said body member.

References Cited in the file of this patent UNITED STATES PATENTS 1,703,457 Robertson Feb. 26, 1929 2,145,975 Ferngren Feb. 7, 1939 2,193,618 Carter Mar. 12, 1940 2,705,101 Everett Mar. 29, 1955 FOREIGN PATENTS 353,407 Germany May 17, 1922