US2368817A - Apparatus for sealing containers - Google Patents

Description

Feb. 6, 1945. P. E; FISCHER 2,368,817

APPARATUS FOR SEALING CONTAINERS Filed Aug. 31, 1943 4 Sheets-Sheet 1 Feb. 6, 1945. FISCHER 2,368,817

'APP ARATUS FOR SEALING CONTAINERS Filed Aug. 31, 1945 4 Sheets-Sheet 2 Feb. 6, 1945. E. Fl-SCH-ER 2,368,817

APPARATUS FOR SEALING CONTAINERS Fi 1ed Aug. .31; 1945 4 Sheets-Sheet 4 Fatented Feio. 6, 1945 APPARATUS F018, SEALENG @QN'EAHNLERS Paul E. Fischer, Portland, Conn, assignor to Mar athon @orporation, a corporation of Wisconsin Application August 31, 1943, Serial No. Siliifidii 2 Qlaims. (Cl. l13-l9)' This invention relates to an apparatus for securing an end closure to the end of cylindrical and truncated conical containers.

According to the present invention a device is provided for quickly and easily applying and securely locking and sealing covers upon containers. The apparatus is particularly adapted for applying covers to paper cylindrical containers provided with an upper metal rim portion. The present device secures a complemental metal band provided on a paper cover which is crimped into locking engagement with the metal rim on the container.

The device of the present invention comprises essentially a series of crimping rollers which are carried on bell-crank arms that are actuated so as to cause the rollers to progressively engage the metal band on the cover for crimping or bending it into locking engagement with the metal rim on the container, whereby the cover is attached and sealed to the container.

Other features, advantages and objects of the invention will be more particularly apparent from the following specification and appended drawings, wherein Figure 1 is a top plan view of the sealing device,

Figure 2 is a sectional view taken on lines 2-2 of Figure l,

Figure 3 is a side elevational view of one of the crimping rollers in its initial crimping position,

Figure 4 is a similar view showing the crimping roll in its final position,

Figure 5 is a fragmental sectional view of the upper portion of the container and cover in the initial crimping stage,

Figure 6 is a fragmental perspective view of the unattached cover and container, and

Figure 7 is a modified form of construction of the sealing device. V

Referring more in detail to the drawings, the apparatus comprises three crimping rollers it,

each rotatably mounted on a shaft H which is on the bell-crank lever 9. Frame-member i6 is provided with brackets 25 carrying handles 36. Stem I8 is fixedly attached to bearing plate so which is provided with a machined fiat camv bearing surface 3| adjacent its outer periphery. Lever-arms M of the bell-crank lever 9 are provided with pressure rollers rotatably mounted on shafts 36. Rollers 35 have a convex contour as shown in Figures 3 and 4. Bearing plate 36 is provided with apertures 40 in order to reduce its weight. Bearing plate 30 is channeled at its outer lower periphery for a purpose to be explained later. K i

The apparatus described is particularly adapted for sealing covers on containers having the construction illustrated in Figures, wherein the body of the. cylindrical container made of heavy fiberboard and the like is provided at its upper open end with a U-shaped metal rim 5! securely fastened thereto. Metal rim 5! is provided with an outwardly extending beaded portion 52. A cover 53 made of fiberboard is provided with a metal rim or band Etafiixed to its outer periphery having an extending curved flange portion 55.

The cover 53 is sealed on the container by the present apparatus so as to assume the final condition illustrated in Figure 4 wherein the curved flange portion 65 of the band 5% on the cover is crimped or bent over into snug engagement with the bead portion 52 of themetal rim 5B of the container. In order to provide a hermetic seal an elastic ring or tube ill may be interposed'between the rim members 55 and 55 as shown in Figure 5.

- In sealing covers on containers with the present apparatus, a cover 55 is placed on the open end of a container 50 in the position illustrated in Figure 5. The sealing device is then positioned manually so thatbearing plate 313 is positioned over the cover 53, the channeled portion es engaging the upper curved flange portion 55 of rim member 5%. Light pressure is then applied manually to both handles 26 and at the same time they are rotated one-third of the circumference. Pressure rolls 35 will assume an initial position as illustrated in Figure 3 making contact with the flat bearing surface 3! at the inner periphery thereof, and upon rotation of the spider 3t, the

convex surface of pressure rolls 35 will make progressive rolling contact with the surface 371 until the position illustrated in Figure 4 is as-.

position shown in Figure 3 to the final position shown in Figure 4. During the travel of the crimping rollers 60 the outer flange portion 55 of the rim member 54 on cover 53 will be crimped inwardly toward the container body 50 and bent into firm engagement'with the head portion 52 of the container rim St. The shaping of -fla'nge portion 55 into the contour complemental with the bead 52 is accomplished by providing rolls ill with a fiat medial portion 8 and an upper inwardly curved or concave portion 7. The initial contact of the rollers it) with the outermost portion of fiangevportion 56 is made by the fiat medial portion 8 of rollers in and the crimping is performed by the inwardly curved portion 1. Upon rotation of the spider member through arms 26 one-third of a revolution, the entire circumference of the rim flange member 54 will be contactedand crimped into locking position. If desired, instead of manual rotation of spider member 56, it' may be attached to a motor driven spindle 66 as illustrated in Figure 5. For this purpose spider member 30 is provided with a sleeve 85 which is fixedly attached to spindle 60 said spider, said plate being adapted for seating" on said end closure, a plurality of bell-crank levers hinged at the extremities of the said spider extending i peripheral margin of an end closure to the end arms, said bell-crank levers comprising an outer normally urging said bell-crank levers outwardly, a crimping roller rotatably mounted on each of said outer lever-arms, a pressure roll rotatably mounted'on each'ofsaid inner leverarms, said pressure rolls being adapted to rotate and bear on the said bearing plate to pivot the said bell-crank lever inwardly whereby said .of a container comprising a spider having spaced arms, a circular bearing plate slidably carried beneath said spider on a centrally positioned stem, said plate being adapted for seating on said end closure, a fiat cam surface adjacent the outer periphery of said bearing plate, a plurality of hell-crank levershinged at the extremities of the said spider arms, said bell-crank levers comprising an outer lever-arm and an inner .to pivot the said bell-cranklever inwardly whereby said crimping rolls will move in an are for crimping said extending peripheral margin of said end closure, and meansto move said spider toward said bearing plate so as to bring the crimping rollers into engagement with the peripheral margin of -said-closure to crimp the same about the end of the container.

PAUL E. FISCHER.

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