US3807569A - Filter screen tracking mechanism - Google Patents
Filter screen tracking mechanism Download PDFInfo
- Publication number
- US3807569A US3807569A US00307316A US30731672A US3807569A US 3807569 A US3807569 A US 3807569A US 00307316 A US00307316 A US 00307316A US 30731672 A US30731672 A US 30731672A US 3807569 A US3807569 A US 3807569A
- Authority
- US
- United States
- Prior art keywords
- belt
- edgings
- central section
- rollers
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/044—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious for filtering
- B01D33/048—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious for filtering with endless filtering bands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
Definitions
- This invention relates to improvements in apparatus for tracking and maintaining the alignment of endless belts and more particularly to a tracking means for maintaining a flexible endless belt filter media, which does not yield to conventional belt tracking means, in proper alignment on its rollers.
- Filtering apparatus frequently include the use of an endless belt filter medium, which usually takes the form of a filter cloth or a flexible plastic screen supported for rotation about two or more spaced apart rollers. It is known to track more rigid types of endless belts by forming a crown portion between the ends of one of the rollers. However, filter screens and other flexible belts become limp and ignore'the crown portion on the roller and tend to either run off the ends of the roller or run towards the crown portion from both edges and pile upon itself. Much work has been done, and many patents have issued disclosing various means to solve this problem. One such meansutilizes two edge gripping devices, a unit on either side of the belt, to grip a beaded edging and pull on the beltvto maintain alignment.
- Another object is to provide such a tracking means which does not require critical or frequent adjustment.
- a still further object of the present invention is to provide a means for tracking a limp endless. filtering belt which in addition to the above will pull on the limp portion of the belt and thereby keep itlaterally taut.
- the tracking device of the present invention is incorporated into one of the rollers which isencircled by the filter screen belt.
- the roller includes a center section of constant diameter, approximately the widthof the, limp portion of the belt, and a pair of end sections which are formed with a crown portion, the center of which is slightly greater than the diameter at each end of each end section.
- a flat, relatively narrow edging of rubber, leather or the like is fastened to both edges of the belt.
- Each edging being of relatively rigid material, tracks and aligns itself on one of the roller crowns. By locating the crowns at a slightly wider spacing than the spacing of the belt edgings the belt will be kept laterally taut.
- FIG. 1 is an elevational view of a portion of a filtering apparatus having an endless filter screen supported between a plurality of rollers, one of which incorporates the tracking device of the present invention
- FIG. 2 is a plan view of a portion of the apparatus in FIG. 1, showing the relationship between the filter screen and the tracking means associated with one of the rollers;
- FIG. 3 is a plan view of one end of the roller illustrated in FIG. 2', showing the relationship between the edge of the filter screen and the crown portion on the roller prior to the filter screen being pulled laterally taut in accordancewith the present invention.
- an endless filter screen or belt 10 encircles atracking roller 12 and one or more additional rollers or drums 14 and 16, as required by the specific process employing the filter screen 10.
- Filter screen 10 may be fabricated from various foraminous materials. well known in the art; e.g., a woven synthetic fabric of either polyester or nylon. Such filter screens are traditionally very flexible and limp and do not yield to conventional belt tracking means used on more rigid belts.
- the belt tracking means ofthe present invention concerns itself with the specific design and the relationship between the filter screen 10 and the tracking roller 12.
- a flat, relatively narrow edging 20 is secured to both I edges of screen 10 so as to define a limp portion 18 therebetween.
- Edgings 20 are preferably made from rubber, leather or any other relatively rigid material.
- Tracking roller 12 includes a center section 22 and a pair of end sections 24, as seen in FIG. 2.
- the center section 22 is of constant diameter and is approximately the same width as'the limp portion 18 of filter screen 10.
- the two end sections 24 are formed with crown portions 26 formed integral therewith.
- the diameter of the center of each portion 26 is slightly greater than the diameter at. the ends of each portion 26.
- the width of each end section 24 is approximately equal to width of the corresponding edging 20.
- the spacing of the crown portions 26 on roller 12 are slightly greater than the spacingof the edgings 20 on filter screen 10, as seen in FIG. 3, for reasons which will hereinafter become more apparent.
- the filter screen 10 is positioned around plurality of rotating rollers l2, l4 and 16 to be driven therewith.
- the limp portion 18 is pulled and kept laterally taut because the crown portions 26 are spaced at a slightly wider distance than edgings 20.
- the filter screen tracking mechanism of the present invention does not pull on or otherwise physically restrain the edge of the filter screen. it allows the filter screen to'track itself, with very little stress induced into the screening material. Further, the tracking mechanism as hereinabove disclosed retains the filter screen laterally taut without the use of additional mechanical devices.
- a filtering apparatus having an endless filtering belt supported between two or more rollers, said filtering belt having a relatively limp central section and a relatively rigid and substantially flat edging fastened to both edges thereof, at least one of said rollers including a central section having a constant diameter and a width substantially equal to the width of said belt central section and a pair of end sections, one at each end of said central section which are formed with crown portions having a diameter which is greater than the diameter of said central section, each of said edgings being positioned so as to track and align themselves on a corresponding crown portion.
- crown portions are spaced a slightly larger distance apart than the spacing of a central portion of each of said belt edgings so as to cause said central section of said belt to remain laterally taut as said edgings center themselves on said crown portions.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
Description
Claims (6)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00307316A US3807569A (en) | 1972-11-16 | 1972-11-16 | Filter screen tracking mechanism |
CA174,174A CA1004993A (en) | 1972-11-16 | 1973-06-15 | Filter screen tracking mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00307316A US3807569A (en) | 1972-11-16 | 1972-11-16 | Filter screen tracking mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US3807569A true US3807569A (en) | 1974-04-30 |
Family
ID=23189187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00307316A Expired - Lifetime US3807569A (en) | 1972-11-16 | 1972-11-16 | Filter screen tracking mechanism |
Country Status (2)
Country | Link |
---|---|
US (1) | US3807569A (en) |
CA (1) | CA1004993A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0885643A2 (en) * | 1997-06-16 | 1998-12-23 | Filterwerk Mann + Hummel GmbH | Belt steering |
-
1972
- 1972-11-16 US US00307316A patent/US3807569A/en not_active Expired - Lifetime
-
1973
- 1973-06-15 CA CA174,174A patent/CA1004993A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0885643A2 (en) * | 1997-06-16 | 1998-12-23 | Filterwerk Mann + Hummel GmbH | Belt steering |
US5866017A (en) * | 1997-06-16 | 1999-02-02 | Advanced Filtraion Concepts | Tracking arrangement for a moving belt |
EP0885643A3 (en) * | 1997-06-16 | 1999-11-17 | Filterwerk Mann + Hummel GmbH | Belt steering |
Also Published As
Publication number | Publication date |
---|---|
CA1004993A (en) | 1977-02-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SMITH & LOVERLESS, INC., A CORP. OF KS. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ECODYNE CORPORATION;REEL/FRAME:003924/0764 Effective date: 19811008 |
|
AS | Assignment |
Owner name: MARINE MIDLAND BUSINESS LOANS, INC., MISSOURI Free format text: SECURITY INTEREST;ASSIGNOR:SMITH & LOVELESS, INC.;REEL/FRAME:005317/0138 Effective date: 19900401 |
|
AS | Assignment |
Owner name: BOATMEN S NATIONAL BANK OF ST. LOUIS, THE A NAT Free format text: SECURITY INTEREST;ASSIGNOR:SMITH & LOVELESS, INC. A CORP. OF KANSAS;REEL/FRAME:006024/0068 Effective date: 19920212 Owner name: SMITH & LOVELOSS INC. Free format text: RELEASE BY SECURED PARTY OF SECURITY AGREEMENT RECORDED AT REEL 5317 FRAME 138.;ASSIGNOR:MARINE MIDLAND BUSINESS LOANS, INC.;REEL/FRAME:006032/0076 Effective date: 19920212 |