US487031A

US487031A - Molded pail from fibrous pulp

Info

Publication number: US487031A
Authority: US
Publication date: 1892-11-29
Anticipated expiration: 1909-11-29

Description

(No Model.) v w r E. HUBBARD. 'MOLDEDPAIL FROM FIBROUS PULR No. 487,031. Patented Nov. 29, 1892 fieye'zz'tan "m: NOR

UNITED STATES PATENT ()FFICE.

EBER. HUBBARD, OF CHICAGO, ILLINOIS.

MOLDED PAIL FROM FIBROUS PULP.

SPECIFICATION formingpart of Letters Patent No. 487,031, dated November 29, 1892. Application filed May 23, 1892. Serial No. 434,040- (No model.)

T0 at whom it may concern:

Be it known that I, EBER. HUBBARD, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Molded Pails from Fibrous Pulp, which are fully set forth in the following specification, reference being had to the accompanying drawings, forming a part thereof.

This invention consists of a pail or similar vessel which is made from fibrous pulp and molded into form, the constructionbein g such as to require a very simple apparatus and resulting in a pail substantially integral and without joints at which there may be liability to leakage.

In the drawings, Figure 1 is a vertical section through my improved pail. Fig. 2 is a top plan. Fig. 3 is an 'elevation of a molded blank of pulp from which the body of the pail is formed.

The body A of the pail is molded in a sector-shaped mold, the radii of whose arcs correspond to the taper of the pail, so that the sector-shaped blank produced in the mold and represented in Fig. 3 being wrapped about the tapering form corresponding to the interior shape of the pail will produce the cone frustum,needing only thebottom to make a complete pail. This blank for the body is molded with its opposite edges beveled, as

seen at A A in Fi s. 2 and 3, so that when rolled up into the shape of the finished pail the beveled edges will lap, as seen in Fig. 2, making a long lap-joint. The lower margin of the blank is also beveled at A on the outer side to afford opportunity for a similar long lap-joint between the body and bottom. The bottom 13 is molded in the form shown in cross-section in Fig. 1 with the downwardlyprojecting marginal flange B constituting the chine of the pail, and the upwardly-projecting marginal flange B whose outer surface corresponds to the taper of the pail and whose inner surface makes an acute angle with the outer at the upper edge, the slope of said inner surface corresponding to the bevel of the lower edge of the body A, so that the body may be inserted within the said upper flange B of the bottom and its beveled edge make contact throughout with the inner sloping surface of the flange, as seen in Fig. 1. When the two parts of the pail thus formed and assembled whi e in the condition of plastic pulp are subjected to pressure to thoroughly expel the moisture and compact the fiber, the pulp will cohere at both the junctions shownto wit, the lap-joint A A of the body and the lap-joint between the marginal flange B of the bottom and the beveled lower margin of the bodyas perfectly as at any other part of the pail, and the structure will thereby become substantially integral and when indnrated according to any of the known methods will have the character of a seamless jointless vessel, as if it were all molded in one process and in one mold; but it will have a smoothness of finish and uniformity of density which it is impossible to attain except by expensive processes of machinery and great care and by primarily injecting the pulp into a mold of the form of the completed pail.

I claim 1. A vessel of fibrous pulp, having a body molded and lapped end upon end, forming a lap-joint from top to bottom, and the bottom molded and lapped onto the body throughout the entire periphery, said body and bottom being rendered integral at such lap-joints, substantially as set forth.

2. The process of making vessels from mold- I ed pulp, which consists in molding a sectoral body with the ends and the shorter side beveled and molding a bottom with an upstanding peripheral flange beveled to correspond with the beveled or side edge of the body, curving the body and lapping its beveled ends one upon the other, and applying the beveled side edge of the body to the beveled upstanding edge flange of the bottom and compressing the vessel thus assembled to integrality at the lap-joints formed by the bevels, respectively, substantially as set forth.

In testimony whereof I have hereunto set myhand, in the presence of two witnesses, at Chicago, Illinois, this 10th day of May, 1892.

EBER. HUBBARD.