US3786926A - Paper filter element center tube - Google Patents

Paper filter element center tube Download PDF

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Publication number
US3786926A
US3786926A US00199565A US3786926DA US3786926A US 3786926 A US3786926 A US 3786926A US 00199565 A US00199565 A US 00199565A US 3786926D A US3786926D A US 3786926DA US 3786926 A US3786926 A US 3786926A
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United States
Prior art keywords
backbone
center tube
ribs
stamping
free ends
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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
Application number
US00199565A
Inventor
J Wilhelm
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Purolator Courier Corp
Original Assignee
Purolator Inc
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Assigned to PUROLATOR COURIER CORP. reassignment PUROLATOR COURIER CORP. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE 06-22-84 Assignors: PUROLATOR SERVICES, INC, PUROLATOR, INC.
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B01D2201/0415—Details of supporting structures

Definitions

  • the annular element usually incorporates a metal perforated tube, called a center tube, on its inside and supporting the element against inward collapse, keeping in mind that the filter media is ordinarily pleated paper, fibrous material or the like, unable to withstand safely the pressure differential existing between the outside and the inside of the element.
  • Prior art filter tubes have included perforated sheet metal bent into a cylinder held in shape by a longitudinally extending mechanical lock-seam, the formation of the perforations representing a scrap loss which is undesirable and ordinarily not providing as free a flow of oil as might be desired.
  • Other disadvantages are outlined in the US. Dudinec Pat. No. 2,843,269, dated July I958, disclosing and claiming an improvement. However, this improvement has the disadvantage of requiring the use of relatively expensive special forming dies and the ends of the center tube are formed by axially offset members as contrasted to the completely flush ends of the previously described prior art center tube which is more generally used.
  • the object of the present invention is to provide a center tube having at least the same strength as the more conventional center tube made of perforated sheet metal while providing a larger open area for drainage or oil flow and which may be stamped from flat sheet metal without scrap loss while, if desired, providing the tube with completely flush ends.
  • a center tube for the described oil or other fluid filter element is formed from a flat sheet metal stamping having a pattern including a longitudinally extended backbone and interspaced ribs extending laterally from this backbone and having free ends, the transverse width and the interspacing of the ribs of this stamping being of substantial equal dimensions so that the material stamped from the spaces between the ribs form the ribs of an adjacent stamping.
  • stamping is intended to mean the use of cooperating dies which are brought together to shear the sheet metal and form the described pattern of product.
  • dies are preferably provided with corrugations which corrugate the resulting stamping throughout its backbone and ribs with the corrugations extending longitudinally with respect to the ribs and, therefore, circumferentially with respect to the finished tube. Also preferably the dies are shaped to form a longitudinally extending stiffening depression in the backbone. This stamping is then bent into a cylindrical tube and the free ends of the ribs are overlapped and interfastened by means of either spot welding or possibly some other method suitable for interfastening sheet metal parts.
  • FIG. 1 is a longitudinal section showing an element incorporating the center tube of the present invention
  • FIG. 2 is a plan of the stamping formed from the flat sheet metal
  • FIG. 3 is an elevation showing the finished center tube
  • FIG. 4 is a cross section taken on the line 4-4 in FIG. 3;
  • FIG. 5 shows a plan of a possible modification.
  • FIG. I shows a typical annular pleated paper filter media 1 supported against internal collapse by the center tube CT of the present invention and typical end caps 2 such as are used to confine the flow of oil or other fluid and force it to travel from the outer periphery of the media 1 and through the latter and through the center tube CT and from the inside of the center tube.
  • FIG. 2 shows the metal stamping, keeping in mind that a multiplicity of these may be stamped from a larger piece of sheet metal with all of the stampings identical.
  • This stamping includes the backbone 3 which extends longitudinally and the interspaced ribs 4 which extend laterally in opposite directions from this backbone 3 and the free ends 5 of these ribs.
  • the transverse width A of the ribs and the interspacing B of these ribs are of equal dimensions for the reason previously described.
  • the ribs are all of the same length.
  • the ribs of the backbone are stamped with the corrugations 6 which extend longitudinally with respect to the ribs 4 and transversely with respect to the backbone 3, and the backbone is stamped with the rib 7 which extends longitudinally with respect to the backbone.
  • This rib is in the form of a depression which terminates near the ends of the backbone, for example, at points approximately at the center lines of the end-most ribs.
  • FIGS. 3 and 4 show how this stamping is bent into a cylindrical tube with its end portions overlapped with their corrugations interfitting, with spotwells 8 interfastening each of the overlapped end portions 5a of all of the ribs.
  • the corrugations 6 permit the use of relatively light gage sheet metal while providing adequate collapse strength, while the rib 7 provides adequate column strength and resistance to bending in general.
  • the corrugations 6 extend circumferentially while the rib 7 extends axially.
  • the stamping shown by FIG. 5 represents a modification which may or may not include the corrugations previously described.
  • the ribs 4a extend laterally or from one side only of the backbone 3a instead of in opposite directions as previously described. To interfasten the free ends 5a of this modification, these ends are overlapped on the backbone 3a and in this manner interfastened.
  • the first example is the presently preferred form of the present invention.
  • An annular fluid filter element for outside-in operation and including a center tube for support against inward collapse; wherein the improvement comprises said center tube being formed from a flat sheet metal are of substantially equal dimensions, said backbone and said ribs are circumferentially corrugated, said backbone has a longitudinally extending stiffening depression, and said free ends are overlapped and connected together.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

Annular filter elements for outside-in operation ordinarily include a center tube for support against inward collapse, and this disclosure concerns a center tube formed from a flat sheet metal stamping including a longitudinally extended backbone and interspaced ribs extending laterally from this backbone and having free ends, the stamping being formed into a cylinder with the backbone extending axially and the ribs extending circumferentially and their free ends fastened.

Description

O United States Patent 1 1 11 1 3,7 86,926
Wilhelm Jan. 22, 1974 [54] PAPER FILTER ELEMENT CENTER TUBE 3,054,507 9/1962 Humbert, Jr. et a1. 210/493 [75] Inventor: John R. Wilhelm, Perth Amboy, e
Primary Exammer-Sam1h N. Zaharna Assistant Examiner-Robert H. Spitzer [73] Ass1gnee: Purolator, Inc., Rahway, NJ. Attorney, Agent or Firm charles Spencer [22] Filed: Nov. 17, 1971 21 Appl. No.: 199,565 ABSTRACT Annular filter elements for outside-in operation ordi- [52] US. Cl. 210/497 narlly include a Center tube for pp against inward [51] Int. Cl BOld 29/04 Collapse and this disclosure concerns a Center tube 58 Field of Search..... 210/43, 436, 437,439,446, formed from a fiat Sheet metal Stamping including 2 0 457 4 3 4 4 4 5 4 7 493 4 longitudinally extended backbone and interspaced ribs 497, 498, 5 extending laterally from this backbone and having free ends, the stamping being formed into a cylinder with I 5 References Cited the backbone extending axially and the ribs extending UNITED STATES PATENTS circumferentially and their free ends fastened.
2,843,269 7/1958 Dudinec 210/483 X 1 Claim, 5 Drawing Figures PAPER FILTER ELEMENT CENTER TUBE This invention relates to annular fluid filter elements of the type commonly used either replaceably or permanently fixed in casings of automotive oil filters and possibly filters of other types.
Customarily such elements are adapted for outside-in operation, meaning that the flow of oil, or possibly other fluid, is from the outer periphery of the element through the element and from the inside of the element and away from the inside of the element. Therefore, the annular element usually incorporates a metal perforated tube, called a center tube, on its inside and supporting the element against inward collapse, keeping in mind that the filter media is ordinarily pleated paper, fibrous material or the like, unable to withstand safely the pressure differential existing between the outside and the inside of the element.
Prior art filter tubes have included perforated sheet metal bent into a cylinder held in shape by a longitudinally extending mechanical lock-seam, the formation of the perforations representing a scrap loss which is undesirable and ordinarily not providing as free a flow of oil as might be desired. Other disadvantages are outlined in the US. Dudinec Pat. No. 2,843,269, dated July I958, disclosing and claiming an improvement. However, this improvement has the disadvantage of requiring the use of relatively expensive special forming dies and the ends of the center tube are formed by axially offset members as contrasted to the completely flush ends of the previously described prior art center tube which is more generally used.
The object of the present invention is to provide a center tube having at least the same strength as the more conventional center tube made of perforated sheet metal while providing a larger open area for drainage or oil flow and which may be stamped from flat sheet metal without scrap loss while, if desired, providing the tube with completely flush ends.
As a brief summary of the present invention, a center tube for the described oil or other fluid filter element is formed from a flat sheet metal stamping having a pattern including a longitudinally extended backbone and interspaced ribs extending laterally from this backbone and having free ends, the transverse width and the interspacing of the ribs of this stamping being of substantial equal dimensions so that the material stamped from the spaces between the ribs form the ribs of an adjacent stamping. The term stamping, as used herein, is intended to mean the use of cooperating dies which are brought together to shear the sheet metal and form the described pattern of product. These dies are preferably provided with corrugations which corrugate the resulting stamping throughout its backbone and ribs with the corrugations extending longitudinally with respect to the ribs and, therefore, circumferentially with respect to the finished tube. Also preferably the dies are shaped to form a longitudinally extending stiffening depression in the backbone. This stamping is then bent into a cylindrical tube and the free ends of the ribs are overlapped and interfastened by means of either spot welding or possibly some other method suitable for interfastening sheet metal parts.
Specific examples of the present invention are illustrated by the accompanying drawings in which:
FIG. 1 is a longitudinal section showing an element incorporating the center tube of the present invention;
FIG. 2 is a plan of the stamping formed from the flat sheet metal;
FIG. 3 is an elevation showing the finished center tube;
FIG. 4 is a cross section taken on the line 4-4 in FIG. 3; and
FIG. 5 shows a plan of a possible modification.
More specifically referring to these drawings, FIG. I shows a typical annular pleated paper filter media 1 supported against internal collapse by the center tube CT of the present invention and typical end caps 2 such as are used to confine the flow of oil or other fluid and force it to travel from the outer periphery of the media 1 and through the latter and through the center tube CT and from the inside of the center tube.
FIG. 2 shows the metal stamping, keeping in mind that a multiplicity of these may be stamped from a larger piece of sheet metal with all of the stampings identical. This stamping includes the backbone 3 which extends longitudinally and the interspaced ribs 4 which extend laterally in opposite directions from this backbone 3 and the free ends 5 of these ribs. The transverse width A of the ribs and the interspacing B of these ribs are of equal dimensions for the reason previously described. The ribs are all of the same length. The ribs of the backbone are stamped with the corrugations 6 which extend longitudinally with respect to the ribs 4 and transversely with respect to the backbone 3, and the backbone is stamped with the rib 7 which extends longitudinally with respect to the backbone. This rib is in the form of a depression which terminates near the ends of the backbone, for example, at points approximately at the center lines of the end-most ribs.
FIGS. 3 and 4 show how this stamping is bent into a cylindrical tube with its end portions overlapped with their corrugations interfitting, with spotwells 8 interfastening each of the overlapped end portions 5a of all of the ribs.
The corrugations 6 permit the use of relatively light gage sheet metal while providing adequate collapse strength, while the rib 7 provides adequate column strength and resistance to bending in general.
Going back to FIG. 2, it can be seen that the ends 5 of the ribs and the bases of these ribswhich define the spaces between them are stamped so their corners are all rounded, each with the same radius to permit the multiple stamping from flat sheet metal without scrap loss previously referred to. As shown by FIG. 4, the stamping is bent so that the rib 7 of the backbone 3 projects inwardly.
In the case of the completed tube, the corrugations 6 extend circumferentially while the rib 7 extends axially.
The stamping shown by FIG. 5 represents a modification which may or may not include the corrugations previously described. In this case the ribs 4a extend laterally or from one side only of the backbone 3a instead of in opposite directions as previously described. To interfasten the free ends 5a of this modification, these ends are overlapped on the backbone 3a and in this manner interfastened. The first example is the presently preferred form of the present invention.
What is claimed is:
1. An annular fluid filter element for outside-in operation and including a center tube for support against inward collapse; wherein the improvement comprises said center tube being formed from a flat sheet metal are of substantially equal dimensions, said backbone and said ribs are circumferentially corrugated, said backbone has a longitudinally extending stiffening depression, and said free ends are overlapped and connected together.

Claims (1)

1. An annular fluid filter element for outside-in operation and including a center tube for support against inward collapse; wherein the improvement comprises said center tube being formed from a flat sheet metal stamping including a longitudinally extending backbone and interspaced ribs extending laterally from this backbone and having free ends, said stamping being formed into a cylinder with the backbone extending axially and the riBs extending circumferentially and their free ends interfastened, and in which the transverse width and the interspacing of said ribs of said stamping are of substantially equal dimensions, said backbone and said ribs are circumferentially corrugated, said backbone has a longitudinally extending stiffening depression, and said free ends are overlapped and connected together.
US00199565A 1971-11-17 1971-11-17 Paper filter element center tube Expired - Lifetime US3786926A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783067A (en) * 1993-04-13 1998-07-21 Facet International, Inc. Elongated filter system, filter element therefor and methods of making same
US20060065609A1 (en) * 2004-09-30 2006-03-30 Arthur David J Fluid control device
USD884866S1 (en) 2018-05-08 2020-05-19 Cummins Filtration Ip, Inc. Filter element
US10918978B2 (en) 2018-05-08 2021-02-16 Cummins Filtration Ip, Inc. Oval filter with exterior elliptical radial seal and internal support structure
USD969289S1 (en) 2020-03-05 2022-11-08 Cummins Filtration Inc. Filter element
US11498022B2 (en) 2017-12-08 2022-11-15 Cummins Filtration Ip, Inc. Oval seal with stabilization contour
US12017171B2 (en) 2018-03-05 2024-06-25 Cummins Filtration Sarl Filter element and housing having non-circular cross-sections

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843269A (en) * 1955-05-16 1958-07-15 Purolator Products Inc Center tubes for filters
US3054507A (en) * 1955-01-05 1962-09-18 Wix Corp Replaceable filter cartridges

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054507A (en) * 1955-01-05 1962-09-18 Wix Corp Replaceable filter cartridges
US2843269A (en) * 1955-05-16 1958-07-15 Purolator Products Inc Center tubes for filters

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783067A (en) * 1993-04-13 1998-07-21 Facet International, Inc. Elongated filter system, filter element therefor and methods of making same
US5985142A (en) * 1993-04-13 1999-11-16 Facet International, Inc. Method of making an elongated filter system
US20060065609A1 (en) * 2004-09-30 2006-03-30 Arthur David J Fluid control device
US11969686B2 (en) 2017-12-08 2024-04-30 Cummins Filtration Ip, Inc Oval seal with stabilization contour
US11498022B2 (en) 2017-12-08 2022-11-15 Cummins Filtration Ip, Inc. Oval seal with stabilization contour
US12017171B2 (en) 2018-03-05 2024-06-25 Cummins Filtration Sarl Filter element and housing having non-circular cross-sections
US11452952B2 (en) 2018-05-08 2022-09-27 Cummins Filtration Ip, Inc. Oval filter with exterior elliptical radial seal and internal support structure
USD930136S1 (en) 2018-05-08 2021-09-07 Cummins Filtration Ip, Inc. Filter element
USD1000600S1 (en) 2018-05-08 2023-10-03 Cummins Filtration Ip, Inc. Filter element
US10918978B2 (en) 2018-05-08 2021-02-16 Cummins Filtration Ip, Inc. Oval filter with exterior elliptical radial seal and internal support structure
USD884866S1 (en) 2018-05-08 2020-05-19 Cummins Filtration Ip, Inc. Filter element
USD969289S1 (en) 2020-03-05 2022-11-08 Cummins Filtration Inc. Filter element
USD999895S1 (en) 2020-03-05 2023-09-26 Cummins Filtration Inc. Filter element

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AS Assignment

Owner name: PUROLATOR COURIER CORP.

Free format text: MERGER;ASSIGNORS:PUROLATOR, INC.;PUROLATOR SERVICES, INC;REEL/FRAME:004661/0820

Effective date: 19840619