Hub ring and supporting plate for a filter and methods for manufacturing these members

- Nagase & Co. Ltd.

Disclosed is a hub ring for a filter wherein a supporting member having a plurality of supporting portions is interposed between a pair of keep plates, a supporting plate for a filter wherein a plurality of wave portions extending substantially in the circumferential direction are arranged in the radial direction, and methods for manufacturing these members. The hub ring has a great opening ratio to achieve a low pressure loss property and causes substantially no residence of polymer, and the hub ring can be manufactured at a low cost. The supporting plate has high pressure resistance, low-pressure loss property, good directivity of polymer flow and excellent polymer mixing effect, and it is suitable for use as a retainer disposed inside of a filter.

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Claims

1. A hub ring provided on at least one of inner and outer circumferences of a disc-type filter comprising:

(a) a pair of keep plates disposed spacedly from each other and in parallel to each other, each of said pair of keep plates being formed as an annular plate.Iadd.with an outer edge.Iaddend.; and
(b) an annular supporting member disposed between said pair of keep plates, said supporting member having (i) a plurality of supporting portions disposed.Iadd.radially inwardly of said outer edges and.Iaddend.spacedly from each other in a circumferential direction of said hub ring, each of said plurality of supporting portions extending between said pair of keep plates in a radial direction to said hub ring and twisting about said radial direction until reaching a substantially perpendicular orientation to said pair of keep plates and (ii) an annular plate portion connected to said plurality of supporting portions.

2. The hub ring according to claim 1, wherein said annular plate portion is connected to one of the inner and outer sides of said plurality of supporting portions in a radial direction of said hub ring.

3. The hub ring according to claim 1 or 2, wherein said supporting member is constructed from a stainless steel.

Referenced Cited
U.S. Patent Documents
2263853 November 1941 Re Qua
4876007 October 24, 1989 Naruo et al.
5055192 October 8, 1991 Artinyan et al.
Foreign Patent Documents
868739 February 1953 ATX
188335 January 1957 ATX
246114 July 1909 DEX
387206 December 1923 DEX
1014523 August 1957 DEX
91518 February 1938 SEX
238098 September 1945 SEX
178749 April 1962 SEX
Patent History
Patent number: RE36133
Type: Grant
Filed: Jul 22, 1997
Date of Patent: Mar 9, 1999
Assignees: Nagase & Co. Ltd. , Kabusushiki Kaisha Toukai Spring Seisakusho
Inventors: Syoichi Yasue (Minokamo), Keiichi Murakami (Funabashi)
Primary Examiner: W. L. Walker
Attorney: Austin R. Miller
Application Number: 8/898,369