Metal working – Method of mechanical manufacture – Multiperforated metal article making
Patent
1996-10-24
1998-05-26
Echols, P. W.
Metal working
Method of mechanical manufacture
Multiperforated metal article making
29897, B23P 1516
Patent
active
057550344
ABSTRACT:
A method for manufacturing a hub ring provided on at least one of inner and outer circumferences of a disc-type filter including: forming a plurality of slits on an annular plate having a central opening at a position on one of inner and outer circumferential edge portions of the annular plate, the plurality of slits being arranged over the entire length of one of the inner and outer circumferential edge portions, each of the plurality of slits extending in a radial direction of the annular plate; twisting portions positioned between respective adjacent slits substantially at an angle of 90 degrees relative to the annular plate to form an annular supporting member; and disposing a pair of keep plates over and under the twisted portions of the annular supporting member, each of the pair of keep plates being formed as an annular plate.
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.
REFERENCES:
patent: 2263853 (1941-11-01), Re Qua
patent: 2530991 (1950-11-01), Reeves
patent: 3457756 (1969-07-01), Rohde
patent: 3537516 (1970-11-01), Kunz
patent: 4236578 (1980-12-01), Kreith et al.
patent: 4876007 (1989-10-01), Naruo et al.
patent: 5055192 (1991-10-01), Artinyan et al.
Murakami Keiichi
Yasue Syoichi
Echols P. W.
Kabushiki Kaisha Toukai Spring Seisakusho
Miller Austin R.
Nagase & Co. Ltd.
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