US2264238A - Sieve - Google Patents

Description

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Patented Nov. 25, 1941 uws-irren stares Trani Feste f 2 Claims.

This invention relates to an improved sieve or filter which is designed and adapted for use in straining paints, lacquers and the like, although the sieve or lter is likewise well adapted for straining other liquids.

Il, is the primary aim of the invention to provide a sieve or filter which can be economically manufactured and sold and which is adapted to replace the cloths conventionally used for straining paint, and which readily absorb the paint and thereafter become a re hazard due to the danger of spontaneous combustion.

It is a further aim of the invention to provide a strainer or sieve constructed of inexpensive material and which therefore may be discarded after being used once or twice and which includes a supporting rim portion formed from a fibrous material which is treated to increase its rigidity and to render it impervious to paints, oils and lacquers and thereby decrease lire hazards by substantially eliminating the possibility of spontaneous combustion.

Still another object of the invention is to provide a strainer having a strainer element of flashproof open mesh fabric attached to the under side of a rim of brous material, along its edges, to provide a flat, flexible intermediate portion through which paint or the like can readily be worked with a putty knife or paddle and which is of such size that when filled with ingredients to be strained, the direction of pull of the load will be in line with the plane of the rim to minimize the danger of collapsing the rim.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, which illustrates a preferred embodiment of the filter or sieve, and wherein;

Figure l is a top plan view of the filter or sieve,

Figure 2 is a side elevational of the same, and

Figure 3 is an enlarged vertical sectional View taken substantially along the plane of the line 3 3 of Figure l.

Referring more particularly to the drawing, wherein like reference characters designate like or corresponding parts throughout the different views, IG designates generally the lter or sieve comprising a conical or funnel shaped supporting rim lI, which is provided with an outwardly projecting annular flange I2 at its upper, enlarged end; and a strainer element I3 having a marginal edge portion I4 attached to the rim II along its under, outer side. The strainer element i3 is formed of a flashproof, flexible open mesh fabric or netting the intermediate portion I5 of which is loosely disposed relatively to the rim II to provide suicient slack to enable paint to be readily worked therethrough with a, putty knife or paddle. A strip of paper or the like, designated I 6 is preferably applied to and secured, by means of an adhesive, as will hereinafter be described, to the under side of the rim II and over the portion Ill of the strainer element I3.

In order to reduce to a minimum the cost of production of the filter or sieve I0, the rim Il is formed of fibrous material made from inexpensive pulp which is saturated with a solution of spirit varnish containing a small percentage of liquid wax after which the upper or inner surface Il thereof, is coated with shellac and allowed to dry. The rim II is then subjected to a heat treatment of substantially 350 Fahrenheit to cause the varnish, wax and shellac to blend in the rim and thereby render the rim imperious to ordinary paints, oils, turpentines and lacquers, and to increase its rigidity and strength. The under or outer side of the rim, designated I8, is then coated with water-glass to render it re and moisture proof and to further increase the rigidity and strength of the rim II. The portion Ill of the strainer I3 and strip I6 are secured to the underside I8, adhesively, by the water-glass and, if desired, the strainer element I3 may be additionally attached to the rim I I, as by stitching, as indicated at I9.

It will thus be seen that the sieve or filter I0 while of inexpensive construction is suiciently strong to function as a sieve for paint and the like, due to the fact that the supporting rim II, although made of fibrous material, is rendered non-absorbing by the before described treatment-l so that it will not be weakened by contact with the paint, or other liquids being strained. Furthermore, the rim II will not absorb the paint and the amount absorbed by the portion I5 of the strainer element I3 will be insuicient to create a fire resulting from spontaneous combustion.

The portion I5 of the strainer element I3 is provided with sufficient slack so that when said portion is lled with a paint or other liquid being strained, the pull of the load will be substantially in alinement with the plane of the rim II to thereby minimize the tendency of the rim to collapse or rupture.

Various modifications and changes are contemplated and may obviously be resorted to, as only a preferred embodiment of the invention has been disclosed.

I claim as my inventionr' 1. A sieve or iilter including a moisture proof supporting rim and a iiexible fiashproof strainer element of open mesh fabric secured along its marginal edge to the underside of the rim with its intermediate portion loosely disposed relatively to the rim; said rim being of brous material, formed from paper pulp, the rim being saturated with a solution of spirit varnish containing a small percentage of liquid wax, the inner side of the rim being provided with a coating of shellac, the rim, when dry, being subjected to heat treatment of approximately 350 Fahrenheit for blending the ingredients in the brous rim to render the inner side of the rim impervious to paints, oils, turpentines and lacquers, the outer side of the rim being coated with water glass to make the rim moistureproof and reproof and to adhesively secure the strainer element thereto.

2. A strainer or sieve comprising a rim of brous material and a strainer element of flexible, flashproof open mesh fabric, attached at its edge portion to the rim; said rim being formed of paper pulp and being saturated with a solution of spirit varnish containing a small percentage of liquid Wax, the inner side of the rim being coated With shellac and the rim being subjected to heat, when dry, to approximately 350 Fahrenheit for blending said ingredients in the rim to renderits inner side impervious to paints, oils, turpentines and lacquers, and the outer side of the rim being thereafter coated with a moistureproong substance.

HOWARD A. BURDWOOD.

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