Патент USA US2130637код для вставки
Sept. 20, 1938K. F.4|_. DARLING' 2,130,637 VACUUM SEALING CAN Filed Nov. l5, 1935 gmc/who@ w1 Patented Sept. 20, 1938 2,130,637 UNITED, STATES PATENT' OFFICE 2,130,637 VACUUM sEaLING CAN Frank L. Darling, D‘ouglaston, N. Y., assignor, by lmcsne assignments, to Crown Can Company, Philadelphia, Pa., al corporation of Pennsyl vania Application November 15, 1035, Serial No. 50,019 i 1 Claim. My invention relates to certain new and use ful" improvements ‘in cans for packing coffee, malted milk and other food products. The present invention is a modification of the 5 generic invention disclosed in my application Serial No. 20,838, filed May 10, 1935, and it has . for its principal object to provide for the use of a vulcanized soft rubber elastic sealing ring or rings as the sealing element. Other objects will in part be obvious and in part be pointed out hereinafter. _ To the attainment of the aforesaid objects and ends the invention still further resides in the novel details of construction, combination and 15 arrangement of parts, all of which' will be first fully described in the following detailed descrip tion, and then be particularly pointed out in the appended claim, reference being had to the ac companying drawing, in Which:20 Figure 1 is a detail vertical cross section on the line I-I of Figure 2. Figure 2 is a top plan view of a can embodying the invention. Figure 3 is an enlarged detail view showing the plug-closure about to be pressed down. Figures 4 and 5 are similar detailed views of modified forms of the invention. In the drawing, in which like numerals and let ters of reference indicate like parts in all the figures, I represents the can and 2 the seam be tween the can I and its top 3. The top 3 has a filling opening which is bound ed by an upwardly and outwardly flared flange 5. Surrounding the fiange 5 and spaced from it 35 is an upstanding bead 4, that portion of the top 3 between the flange 5 and the bead 4 serving as a seat against which the annular supporting portion 9 of the plug-type closure 6 rests in order to prevent contact between the cut edge of the 40 flange 5 andthe crown 8 of the closure 6 when the closure is forced into place. The closure 6 includes an annular wall 'l which mer-ges with the crown or upstanding bead 8. The bead 8 serves as a cover for the flange 5 and 4.5 also` has a seat or stop for the sealing ring I3, (Cl. 220-44) sealing ring I3 projects. The ring I3 may be a rubber band of suitable dimensions and may be cut from^a rubber tube if desired.' In addition to the ring I3 a second ring I4 of elastic rubber or of plastic may be used to overlie and receive the cut edge of the flange 5b, as shown in Fig ure 5. In Figures 4 and 5 are illustrated modiñed forms of the invention, In Figure 4 those parts which correspond in purpose or function to those l0 of Figures 1 to 3, inclusive, bear the same ref erence numeral plus the index letter “a”, while similar parts in Figure 5 bear the same reference numeral plus the index letter “b”, so a detailed description of these figures is thought to be 15 unnecessary. In Figure 5, I4 designates the sec ond rubber ring (or plastic substance, if such be used) that embeds or receives the cut edge of the ilange 5b. 'I'he stop 9b in Figure 5 prevents the insertion 20 of the plug-closure to such a distance as would permit the cut edge of the ñange 5b to cut through the ring I4, or, in other words, to limit the insertion of the plug-closure so as to stop it before 5b can pass through I 4. 25 With the construction shown and described, an elastic rubber ring can be placed around the wall 'l (la or 1b) and as the closure is forced down the ring I3 will enter the V-shaped space I5 and be squeezed into tight sealing contact 30 with the ñange 5 and wall l, the suction, due to the vacuum in the can, serving to assist in draw ing the ring I5 into tight sealing engagement (see Figures 1 and 4). The ring, being of soft vulcanized rubber, is of course deformable and 35 will be drawn or pressed down into the V-shaped space I5 to tend to completely ñll it (see Figure 5, for example). The annular stop 9, as before intimated, serves to prevent the plug-closure from being forced 40 down too far and prevents the edge of the flange 5 from cutting through the sealing element I4, if such be used. _ ` The present structure, While cheapening the manufacturing cost somewhat, possesses many of 45 or rings I3b and I4 (see Figure 5) as the case the advantages of my previously designed can of may be. the application aforesaid, in that it will effectively y rI'he outer edge of the closure is extended up wardly and outwardly in order to provide a rim O I2, from the extreme edge of which, at suitable intervals, extend points I0 which overlie the bead 4 and are spot-secured thereto as at II, as in my former application aforesaid. The flange 5, making an angle with the wall 55 'Lprovides a V-shaped pocket I5 into which the hold the vacuum and will be self-venting upon generation of pressure within the can. If desired, in the manufacture of the can, the 50 plug wall 'l may be slightly tapered to permit the cut ring I3 to be easily placed on or slipped on, and furthermore the tapering will assist in the pressing of the plug into the can. The rings I3, if cut from tubing, will be very cheap to manu 55 2,130,637 facture and the expense of molding or squirting a having, in cross-section, substantially the outline plastic compound into the crown 8 (or 3a,` or 8b» 'of an acute angle, and a rubber elastic sealing ring on said upstanding wall and adapted to be as the case may be) is avoided. It .should of course be understood that the entirely positioned between said flange and said points I0 are secured to the can lightly, as in my wall to form a seal when the closure is in place, previous application, so that they will become detached on the generation of dangerous pres sures within the can and yet hold for ordinary pressures to allow the plug-closure itself to Yact 10 as a valve for venting purposes. From the foregoing description, taken in con nection with the accompanying drawing, it is thought that the complete construction and ad vantages of the invention will be clear to those 15 skilled in the art to which it relates. What I claim is: In a can having a filling opening bounded by an upwardly and outwardly flared flange, a plug type closure fitting into said opening, and hav 20 ing an annular upstanding wall merging with an annular crown portion which overlies said flange on the can, said flange and said annular up standing wall providing between them a space the outer surface of said sealing ring being 'adapted to contact with said ñared wall in such closed position, means to arrest the insertion of said closure before the edge of said ñange can touch said crown portion, said closure having 10 points adapted to be secured to the can and by virtue of which the closure itself may act as a pressure relief valve, the movement of said seal ing ~ ring within said acute-angle space upon closing movement of the closure causing said sealing ring to be wedged and entirely seated 15, between said upstanding wall and said ñared flange, and upward opening movement of said closure with said sealing ring thereon resulting in establishing a vent between said sealing ring 20 and said ñared flange. FRANK L. DARLING.