US693282A

US693282A - Vacuum-sealed and seamed key-opening can.

Info

Publication number: US693282A
Application number: US2620300A
Authority: US
Inventors: Bernard H Larkin
Original assignee: AUTOMATIC VACUUM CANNING Co
Current assignee: AUTOMATIC VACUUM CANNING Co
Priority date: 1900-08-08
Filing date: 1900-08-08
Publication date: 1902-02-11
Anticipated expiration: 1919-02-11

Description

No.. 693,232. ',Patented Feb. n, |902. B. H.` LARKIN. A

VACUUM SEALED AND'SEAMED KEY OPENING CAN." (Application med Aug. a, 1900. v

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VACUUM SEALED AND sEA'MEn KEY oPENmG GAN.

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NITED STATES PATENT OFFICE.

BERNARD H. LARKIN, OF RIVER FOREST, ILLINOIS, AssICNOR To THE AUTOMATIC VACUUM CANNINCr COMPANY, OF CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS.

VACUUM-SEALED AND SEAMED KEY-OPENING CAN.

SPECIFICATION forming part of Letters L'Patent N o. 693,282, dated February 11 1902.

Application led August 8, 1900. Serial No. 26,203. (No model.)

To LZZ whom it may concern,.-

Be it known that I, BERNARD H. LARKIN, a citizen ofthe United States, residing in River Forest, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Vacuum-Sealed and Seamed Key-Opening Cans, of which the following is a specification.

My invention relates to improvements in sheet-metal cans.

The object of my invention is to provide a sheet-metal can which is at once adapted to have its cover hermetically sealed to its body by a vacuum or atmospheric pressure seal and additionally secured thereto by a mechanical lock or seam and adapted to be opened by a tongued tearing-stri p and to be again Closed by a slip-covor,`substantially air-tight, and which after being once opened by the removal of the tearing-strip will have a smooth upper edge at its mouth.

. scores or weakened lines.

In the accompanying drawings, forming a part of this specification, and in which similar letters of reference indicate like parts throughout all the figures, I have illustrated a sheet-metal can embodying my invention and also its successive steps or stages of manufacture.

In said drawings, Figure 1 shows the blank of which the can-body is formed in the dat, with the tongued tearing-strip marked oit by Fig. 2 is a canbody formed from the blank; Fig. 3, the canbody provided with a wide internally-projecting bead; Fig. A., the same in the next step with the walls ofthe beadV compressed together to form an internal fold in the stock of the can-body. Fig. 5 shows the'same in the next step after this `internal fold has been stamped or pressed up against the cylindrical wall of the can-body. Fig. 6 shows the same in the next step with the upper edge of the can-body furnished with a turn or roll to form a smooth shoulder for the packing-ring to enable the Cover to be sealed and secured to the can-body by the vacuum or atmos-` pheric pressure seal. Fig. 7 shows the'can with cover loosely in place thereon ready to have the air exhausted from the can and the Cover sealed or secured thereto bya vacuum or atmospheric pressure seal. Fig. 8 shows the can after the cover has been mechanically locked, seamed, or secured on the caubody. Fig. 9 showsthe can after the same has been opened by winding the tongued tearing-strip around a key. Figs. l0 and ll are enlarged det-ail views of the slip-cover and of the can having a smooth-edged mouth formed by removing the tearing-strip. Fig. l2 is a similar view showing the can again closed by the slip-cover.

ln the drawings, A represents a can-body, the same being formed of a rectangular blank A', which in the flat, as illustrated in Fig. 1, is provided with a tongued tearing-strip a, marked off by scored or. weakened lines a' a2 and with a notch a3 at the lapped sideseam a4. After the can-body has been formed into cylindrical shape, as illustrated in Fig. 2, and

its side seam soldered a wide internaliyfprojecting bead b is formed inthe can-body with itsupper edge just below the lower scoredor weakened line a2 of the tongued tearing-strip.

The next step is to stamp or compress the Y walls b of the beadb together, as illustrated .in Fig. 4, thus forming an internal fold d in the stock or wall of the can-bod y itself.A After this 'has been done the next step is to turn,

stamp, or compress this internal fold d upwardly and outwardly firmly against the wall of the can-body, thus giving it a curved shape, so that the upper portion or edge d of this now upright curved or semitubular fold d will iit snug against and support, brace, and stiften the can-body wall at the tearing-strip portion a. thereof, as illustrated in Fig. 5. The upper edge of the can-body is next provided with a flange, turn, or rollf, as illustrated in Fig. 6, to form a smooth shoulder or bearing for the packing-ring g and also as a means for Inechanically uniting, seaming, or locking the cover H to the can-body. AThe cover H has an annular groove or channel h, formed by and between its inner flange h and its outer iiange hto receive the packing-ring g. After the cover H has been loosely put on the can, as illustrated in Fig. '7 ,the can being filled and the packing-ring g in place, the can is placed in the receiver of an air-pump andthe air exhausted therefromand from the can, and then the atmospheric pressure being suddenly restored to the receiver the cover H is hermetically sealed and secured to the canbody by a vacuum or atmospheric pressure seal. As this step or operation makes no change in the shape of the can or its cover, excepting, of course, a slight collapsing of the bottom and the cover of the can, I have not in the drawings repeated Fig. 7, and Fig. 7 may consequently be considered as also representing the condition of the can after the vacuum-sealing operation. The next step is to mechanically lock, seam, crimp, or secure the cover on and to the can-body. This may be most conveniently and cheaply done by simply turning or crimping the lower edge h3 of the outer` flange of the cover H under the shoulder formed by the fiange, turn, or rollfat the upper edge of the can-body, as illustrated in Fig. 8.

To open the can, the tongued tearing-strip a is wound around a key in the usual manner, thus leaving the upright fold dwith its smooth upper edge or surface d projecting above the lower torn edge a, formed by the removal of the tearing-strip, and thus giving the canbody a perfectly-smooth upperedge or mouth after it has been opened and also leaving the portion a7 of the original can-body above the upper score a firmly attached to the cancover H, and thus forming a slip-cover flange therefoig-and the slip-cover flange a7, being a portion of the original can body, is of course a tight and accurate fit for the upright fold d, which, as before stated, was firmly stamped or pressed outward against the can- "`body.` As the upright fold d has a slight outward inclination and a smooth beveled upper edge produced by the fold in the-stock and as the slip-cover fiange a7 has a slight inward inclination from its lower edge to its point of union with the cover H produced by the action of the crimping-tools in turning the fiange h2 inward, the slip-coveris given a very tight wedging fit:- on the can-body, so that the can may be closed practically air-tight after it has been once opened. The tight fit of the slip-cover on the can body is further produced or aided by the wedging annular crevice 714, formed between the cover H and its slip-cover fiange a7, as will be readily understood from Figs. 9, lO, 11, and 12.

As the internal upright fold d has a curved or semitubular form in cross-section, it gives great strength and stiness to the mouth of the can and affords a firm support to the tearing-strip, so that the tearing-strip will separate easily and uniformly and with certainty when it is wound upon the key in opening the can.

I claim l. The combined slip-cover, seaming and vacuum-sealing key-opening can, consisting in a can-body A furnished with a tongued tearing-strip a, and provided with an internal upright fold CZ in the stock of the can-body, said fold projecting above the lower score of the tearing-strip, and having a smooth upper edge, a cover H having inner and outer flanges 7L h2, and annular channel h, furnished with a packing-ring g, said can-body having atits upper edge a ange, turn or roll mechanicallysecured or united to said cover, said cover being also sealed and secured to said canbody by a vacuum or atmospheric pressure seal, and said can-body having a slip-coveriange port-ion a7 projecting above the upper score of the tearing-strip, and adapted to tightly fit, when the tearing-strip is removed, said upright foldd of the can-body, substantially as specified.

2. The combined vacuum-sealed and mechanically sealed or seamed key-opening can consisting in a can-body provided with au outwardly-turned seaming flange or roll at its upper end forming also a smooth seat or bearing for a packing and provided with a tongued tearing-strip below said seamingflange, a cover having inner and outer iianges and a packing between said fianges and sealed and secured to said can-body by a vacuum or atmospheric seal, said cover having its outer flange crimped or turned under said external seaming flange or roll on the can-body and mechanically sealing or seaming the cover on the can, substantially as specified.

3. The combination in a vacuum-sealed and mechanically sealed or seamed can, of a canbody having an external seaming fiange or roll atits upper end and forming also a smooth seat or bearing for a packing, of a cover having a packing and a packing seat or channel and sealed and secured to said can-body by a vacuum or atmospheric pressure seal compressing and holding compressed the packing and provided with an external downturned seaming fiange having its lower portion crimped or turned under the said seaming flange or roll on the can-body, substantially as specified.

BERNARD H. LARKIN. Vitnesses:

EDMUND ADoooK, H. M. MUNDAY.

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