Patents Assigned to Kabushiki Kaisha Toukai Spring Seisakusho
-
Publication number: 20110094959Abstract: A filter retainer supports filtering materials on both surfaces of the filter retainer. A pair of etched circular plates having a large number of circumferentially arranged through-holes formed by chemical etching are joined to each other at a condition where the positions of corresponding through-holes are aligned to coincide with each other, and at the joined form, radially extending internal paths are formed between the pair of etched circular plates. The structure of the filter retainer avoids accuracy and pressure loss of conventional filter elements cause by internal structures thereof.Type: ApplicationFiled: March 31, 2009Publication date: April 28, 2011Applicants: NAGASE & CO., LTD., KABUSHIKI KAISHA TOUKAI SPRING SEISAKUSHOInventors: Kenichi Kurimoto, Yuya Tahara, Yoshimichi Hiraoka, Shigehiro Hori
-
Patent number: 5858230Abstract: 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.Type: GrantFiled: October 24, 1996Date of Patent: January 12, 1999Assignees: Nagase & Co. Ltd., Kabushiki Kaisha Toukai Spring SeisakushoInventors: Syoichi Yasue, Keiichi Murakami
-
Patent number: 5829138Abstract: 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.Type: GrantFiled: September 24, 1997Date of Patent: November 3, 1998Assignees: Nagase & Co., Ltd., Kabushiki Kaisha Toukai Spring SeisakushoInventors: Syoichi Yasue, Keiichi Murakami
-
Patent number: 5788860Abstract: A method for manufacturing a supporting plate provided inside of a disc-type filter having filter media at surface portions thereof including the steps of: forming an annular plate having opposed surfaces; andforming a plurality of wave portions on the annular plate that alternately extend beyond the opposed surfaces in opposite directions by pressing, each of the plurality of wave portions extending substantially in a circumferential direction of the annular plate and the plurality of wave portions being arranged substantially adjacent to each other in a radial direction of the annular plate.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 retainer disposed inside of a filter.Type: GrantFiled: October 24, 1996Date of Patent: August 4, 1998Assignee: Nagase & Co., Ltd. and Kabushiki Kaisha Toukai Spring SeisakushoInventors: Syoichi Yasue, Keiichi Murakami
-
Patent number: 5755034Abstract: 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.Type: GrantFiled: October 24, 1996Date of Patent: May 26, 1998Assignees: Nagase & Co., Ltd., Kabushiki Kaisha Toukai Spring SeisakushoInventors: Syoichi Yasue, Keiichi Murakami
-
Patent number: 5611925Abstract: 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.Type: GrantFiled: March 22, 1995Date of Patent: March 18, 1997Assignees: Filtration Systems, Inc., Kabushiki Kaisha Toukai Spring SeisakushoInventors: Syoichi Yasue, Keiichi Murakami