Patent US2089537A successfully refreshed from Google Patents.
Patent US4846971A successfully refreshed from Google Patents.
US4846971A
Expired / Lapsed
US
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Sieves for scrubbers and their method of manufacture
Assignee: E&M Lamort
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Filing: 1988-02-16
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Granted: 1989-07-11
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Expires: 2008-02-16
Abstract
Abstract The invention relates to a sieve for a paper pulp scrubber or similar equipment, and to a method for fabricating such a sieve. The sieve is produced by mechanical interfit of bars with support members, the bars carrying notches, the lips of which engage at least one V-shaped lateral groove formed in each support member, while the support members present, on their face receiving the bars, a first set of notches for positioning the bars. The cross-section of the support members at the level of the first notches has the same configuration and dimensions as the cross-section of the second notches and the cross-section of bars at the level of notches has the same configuration as the cross-section of notches formed in the support members. Assembling is made by bending a bar by an angle of about 20-25° for widening a second notch and inserting a support member therein. The bar is then straightened back, so that the support member will be firmly clamped in the notch.
Inventors
- 👤 Pierre Lamort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:38
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4618; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/25; B01D29/44; B01D29/445; B01D29/76; B01D29/86; B07B1/12; B07B1/18; B07B1/4681; B07B1/50; D; D21; D21D; D21D5/00; D21D5/02; D21D5/16; B01D2201/00; B01D2201/18; B01D2201/184; B01D2201/28; B01D2201/287; B07B2201/00; B07B2201/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49826; Y10T29/49908; Y10T29/49925
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
127 words
A sieve for scrubbers, comprising a plurality of support members each having a lateral groove and end portions, a plurality of solid elongated bars each having portions which mechanically interfit via a first set of notches with said lateral grooves of the support members to form a sieve, each support member further having a second set of notches spaced along a periphery thereof and engaging with said bars, said notches of the first set having a dovetail configuration with a base being wider than an opening and at least one side positioned at an acute angle to the base, said support members being spaced along the length of the bars, said bars defining spaces therebetween and said first and second notches positioning the bars and support members.
Claim 2
Dependent Claim
127 words
A sieve for scrubbers, comprising a plurality of support members each having a lateral groove and end portions, a plurality of solid elongated bars each having portions which mechanically interfit via a first set of notches with said lateral grooves of the support members to form a sieve, each support member further having a second set of notches spaced along a periphery thereof and engaging with said bars, said notches of the first set having a dovetail configuration with a base being wider than an opening and at least one side positioned at an acute angle to the base, said support members being spaced along the length of the bars, said bars defining spaces therebetween and said first and second notches positioning the bars and support members.
Claim 3
Dependent Claim
41 words
A sieve according to claim 1 wherein the first set of notches are dissymmetrical and have one face perpendicular to the axis of the bar and another face being inclined by an angle in the range from about 20 to 25°.
Claim 4
Dependent Claim
88 words
A sieve according to claim 2, wherein the end portions of the support members present, over a length corresponding to several notches of the second set, a thickness (measured along a parallel to the bars) of approximately half the thickness of a central portion of the support members so as to reconstitute the full cross-section of the support members by superimposing said end portions which are thereafter assembled by tightening together the flanks of the notches of the first set formed in the bars overlying said end portions.
Claim 5
Dependent Claim
60 words
A sieve according to claim 2, wherein there are provided from place to place thick second bars parallel to said elongated bars, wherein said second bars are thicker along the radial axis than the elongated bars and said thick second bars form protruding obstacles over the narrow face of the spaces formed between the elongated bars and the second bars.
Claim 6
Dependent Claim
37 words
A sieve according to claim 2 wherein the sieve is cylindrical, with a circular or regular polygonal cross-section, the bars being parallel to the axis of the cylindrical sieve and support members being perpendicular to said axis.
Claim 7
Dependent Claim
81 words
A sieve according to claim 1, wherein the end portions of the support members present, over a length corresponding to several notches of the second set, a thickness of approximately half the thickness of a central portion of the support members so as to reconstitute the full cross-section of the support members by superimposing said end portions which are thereafter assembled by tightening together the flanks of the notches of the first set formed in the bars overlying said end portions.
Claim 8
Dependent Claim
37 words
A sieve according to claim 1 wherein the bars and the support members are approximately of the same thickness and the notches of both sets have depths the sum of which is approximately equal to said thickness.
Claim 9
Dependent Claim
30 words
A sieve according to claim 1 wherein the bars have a generally trapezoid-shaped cross-section and the notches of the first set are located on the smaller side of the trapezoid.
Claim 10
Dependent Claim
59 words
A sieve according to claim 1 wherein there are provided from place to place thick second bars parallel to said elongated bars, wherein said second bars are thicker along the radial axis than the elongated bars and said thick bars form protruding obstacles over the narrow face of the spaces formed between the elongated bars and the second bars.
Claim 11
Dependent Claim
29 words
A sieve according to claim 1 wherein the bars have lateral faces forming upstream faces of the spaces, said bars having a spur protruding outward beyond the lateral faces.
Claim 12
Dependent Claim
30 words
A sieve according to claim 1 wherein at least some of the bars are dissymetrical and have one lateral face approximately perpendicular to anterior and posterior faces of said bars.
Claim 13
Dependent Claim
38 words
A sieve according to claim 1 wherein the sieve is cylindrical, with a circular or regular polygonal cross-section, the bars being parallel to the of the axis cylindrical sieve and the support members being perpendicular to said axis.
Claim 14
Dependent Claim
38 words
A sieve according to claim 1 wherein the sieve is cylindrical, with a circular or regular polygonal cross-section the bars being parallel to the axis of the cylindrical sieve and the support members being perpendicular to said axis.
Claim 15
Dependent Claim
42 words
A sieve according to claim 1 wherein the sieve is planar and comprises a plurality of elementary sieving surfaces each surface being arranged so that either the bars or the support members are approximately oriented radially towards the center of the sieve.
Claim 16
Independent Claim
184 words
A method of manufacturing a sieve for scrubbers, said sieve having a plurality of support members with a lateral groove and a plurality of elongated bars, each said elongated bar having a first set of dovetail notches with a base being wider than an opening and at least one side positioned at an acute angle α to the base, each said groove being adapted for close engagement with said first set of dovetail notches, said method comprising of the following steps: (a) folding each said bar at a level of said dovetail notches by an angle at least equal to α; (b) placing said bars over said plurality of support members so that said grooves are received by said dovetail notches; (c) straightening said bars so as to clamp the support members; (d) closing a cylinder by superimposing together end portions of the support members, said end portions having a thickness substantially equal to the half thickness of a central portion of the support members; and (e) bringing said bars into place and clamping the support members within the dovetail notches of said bars.
Claim 17
Independent Claim
184 words
A method of manufacturing a sieve for scrubbers, said sieve having a plurality of support members with a lateral groove and a plurality of elongated bars, each said elongated bar having a first set of dovetail notches with a base being wider than an opening and at least one side positioned at an acute angle α to the base, each said groove being adapted for close engagement with said first set of dovetail notches, said method comprising of the following steps: (a) folding each said bar at a level of said dovetail notches by an angle at least equal to α; (b) placing said bars over said plurality of support members so that said grooves are received by said dovetail notches; (c) straightening said bars so as to clamp the support members; (d) closing a cylinder by superimposing together end portions of the support members, said end portions having a thickness substantially equal to the half thickness of a central portion of the support members; and (e) bringing said bars into place and clamping the support members within the dovetail notches of said bars.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |