Filter screen and method of making same
First Claim
Patent Images
1. An assembly for filtering flow through a valve comprising:
- (a) valve body structure defining an inlet having a bore with an enlarged diameter region at the upstream end thereof;
(b) a generally cup-shaped member formed of perforate material disposed in said inlet, said member having;
(i) an annular flange extending outwardly from the open end of said cup-shape formed of material folded radially inwardly upon itself;
(ii) a locating region adjacent said flange and sized to closely interfit said bore for locating said member in said inlet;
(iii) a generally cylindrical region having a diameter significantly less than said bore and a generally flat closed end portion; and
,(c) means retaining said member in said inlet.
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Accused Products
Abstract
A filter for a valve inlet is drawn into a flat-bottomed cup shape from a blank of fine mesh woven screen and formed with an outwardly extending mounting flange of material folded back on itself. The region of the cup-shape proximate the flange is enlarged to a predetermined diameter for closely interfitting the flow passage into which the cup-shaped member is installed.
34 Citations
9 Claims
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1. An assembly for filtering flow through a valve comprising:
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(a) valve body structure defining an inlet having a bore with an enlarged diameter region at the upstream end thereof; (b) a generally cup-shaped member formed of perforate material disposed in said inlet, said member having; (i) an annular flange extending outwardly from the open end of said cup-shape formed of material folded radially inwardly upon itself; (ii) a locating region adjacent said flange and sized to closely interfit said bore for locating said member in said inlet; (iii) a generally cylindrical region having a diameter significantly less than said bore and a generally flat closed end portion; and
,(c) means retaining said member in said inlet. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making a filter for a flow passage comprising:
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(a) providing a blank of woven screen material; (b) drawing said blank to a generally cup-shaped configuration and forming the closed end thereof to a flat-bottomed shape; (c) folding the rim of the open end outwardly and inwardly upon itself and forming an outwardly extending flange thereon; and
,(d) inserting said cup-shaped in a bore and locating said cup shape by registering against said flange. - View Dependent Claims (8, 9)
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Specification