US643908A

US643908A - Jar-closure.

Info

Publication number: US643908A
Authority: US
Inventors: Ernst R Meyer
Original assignee: Individual
Current assignee: Individual
Priority date: 1898-02-16
Filing date: 1898-02-16
Publication date: 1900-02-20
Anticipated expiration: 1917-02-20

Description

No. 643,908. Patented Feb. 20, I900. E. R. MEYER.

JAR CLOSURE.

(Application filed Feb. 16, 1898.)

(No Model.)

. THE No zms PETER-5 'co..' PHOTO LIYHO" WASHINGTON. D. c.

UNITED STATES PATENT OFFICE.

ERNST R. MEYER, OF DETROIT, MICHIGAN.

JAR-CLOSURE.

SPECIFICATION forming part of Letters Patent No. 643,908, dated February 20, 1900. Application 1118a February 16, 1398. Serial No. 670,485. on, model.)

T0 at whom it may concern.-

Be it known that I, ERNST R. MEYER, a citizen of the United States, residing at Detroit,

in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in J ar-Closures, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention consists in the construction of a closure for jars comprising the jar proper having a shoulder independent of and below the upper edge, a packing on the shoulder, and a flange-cap fitting over the upper edge of the jar and bearing on the packing on the shoulder, together with means for drawing the cap down upon the packing, all as more fully hereinafter described.

In the drawings, Figure l is a vertical central section through a jar embodying my invention, partly in elevation. Fig. 2 is a plan view of the clamping-ring. Fig. 3 is a'section through the mold, showing the manner of making the jar.

In the present state of the art fruit-jars are usually provided with a rubber band laid on the top thereof, with a screw-cap fitting an exterior screw-thread on the jar and clamp ing the ring upon the jar-top. The disadvantages of this construction are well known and many attempts have been made to overcome the same. Among others it has been proposed to place this rubber band on the top and use a clamping-ring formed by a contractile band for drawing the cover down upon the rubber band. This has proven to be objectionable for the following reason: In the manufacture of the jars two-part molds are used, such as are indicated in Fig. 3 at A, B being the blowpipe upon which the gather is brought to the mold. In the upper part of the mold is a portion 0, called the bust-0d. If the rubber band is to be placed upon the upper edge of the jar from which this bust-off is broken, the rough edges remaining must be ground down. In grinding down quite a number of the jars are broken, and as it is done by unskilled labor the edge is not always in the proper plane, so that when the top is clamped on one edge may be higher than the other, and thus give an unequal pressure at different points and produce a leaky closure.

My invention obviates these objections and is carried out as follows: D is the jar, which has the bust-off flange E at the top, which may be ground off or not, so far as its satisfactory results are concerned with my con= struction. Below the top I form a rib G, the upper face of which forms a flat shoulder F, which is formed by blowing into a groove in the mold, as plainly shown in Fig. 3, and it is therefore always perfectly smooth and true if the mold is so made. The under side of this rib has the inclined face H. The bust-off flange E projects slightly above the top of this shoulder and serves as a centering-guide for the cap H, which has the downwardlyextending marginal flange I, adapted to fit freely over the flange E and rest upon the packing-ring J on the shoulder. This cap has a recess K in its under side, or else the flange I is of a sufficiently-greater depth than the height of the flange E, so that there is no danger of the cap striking the flange even when the packing is quite compressed.

The clamping-ring is preferably of sheet metal and has overlapping ends and is adapted to be drawn tightly about the upper end of the jar by means of the lever K. It acts to bind the cap down tight upon the packing by means of the flexible inclined flanges L at the top and bottom edge, which bear, respectively, against the under side of the rib G (and on its inclined face H) and on the face M, preferably, also, slightly beveled on the edge of the cap. By this construction I am enabled to obtain a perfectly-tight closure and yet to manufacture the jars at a sufliciently-low price to enable me to sell them upon the market.

What I claim as my invention is 1. In a jar-closure, a contractile clampingring formed of a sheet-metal band having overlapping ends linked together by a clamping-lever to which said ends are directly connected, the hand between the points thus connected being of a length greater than the circumference of the jar at the closure.

2. In a jar-closure, a contractile clampingring formed of a sheet-metal band having alternating fiat portions and portions having inwardly-inclined clamping-fingers on the edges of the band and provided with overlapping ends linked together by a clamping lever adapted to draw said ends in opposite directions when the jar is closed.

3. In a jar-closure, a contractile clampingring formed of a flat sheet-metal band formed at intervals along its upper and lower edges with a series of inwardlyinclined flexible clamping fingers and having overlapping ends and a clamping-lever in the plane of the band to which said ends are directly connected, the length of the band between said connections being greater than the circumference of the jar at the closure.

4. In a jar-closure, the combination of a contractile clamping-ring formed of a sheetmetal band having ends adapted to overlap each other when the jar is closed and a clamping portion intermediate between said ends provided at intervals apart with inwardlyprojecting marginal clamping-fingers adapted to press the jar and cover together at restricted points in the circumference thereof, and a clamping-lever to which the band is directly connected, the band between the points thus connected being integrally of greater length than the circumference of the jar at the closure.

5. In a jar-closure, the combination of a contractile clamping-ring formed of a sheetmetal band with overlapping ends and a clamping portion intermediate between said ends provided at intervals along its upper and lower edge with inwardly-projecting flexible clamping-fingers adapted to press the jar and cover together at discontinuous points around the same, and a clamping-lever directly connected to the band, the length of the band between the points thus connected being greater than the circumference of the jar at the closure.

In testimony whereof I afiix my signature in presence of two witnesses.

ERNST R. MEYER.

Witnesses:

S. M. IIULBERT, M. 13. ODooHERrY.