Optical: systems and elements – Lens – With support
Patent
1994-12-19
1997-11-18
Epps, Georgia Y.
Optical: systems and elements
Lens
With support
G02B 702
Patent
active
056893795
ABSTRACT:
A cylindrical product with an inner gear formed by injection molding, a mold for the cylindrical product, and a method of manufacturing the same are disclosed. The molded product may include a cylindrical base member, a spiral inner gear formed on an inner peripheral surface of the cylindrical base member so as to be inclined to a circumferential direction of the cylindrical base member, and a spiral relief groove formed on the inner peripheral surface of the cylindrical base member adjacent to the inner gear. The relief groove may be wider than a tooth width of the inner gear. The method of manufacturing the cylindrical product includes the steps of inserting a first cylindrical mold into a hole at the center of a second cylindrical mold, engaging a toothed portion on the first cylindrical mold with a spiral groove on the second cylindrical mold to provide a lower mold, mounting an upper mold thereon to form a space for forming the cylindrical product, injecting molten resin material into the space to harden it therein, withdrawing the second cylindrical mold in a direction to allow the mold to be opened, axially moving the first cylindrical mold to insert the toothed portion into a relief groove on a flat portion of the second cylindrical mold, rotating the first cylindrical mold in a direction to withdraw it along the flat portion, and removing the upper mold to extract the cylindrical product.
REFERENCES:
patent: 3888568 (1975-06-01), Norris et al.
patent: 4105390 (1978-08-01), Hehl
patent: 4362291 (1982-12-01), Fuke et al.
patent: 5144493 (1992-09-01), Nomura
Nomura Hiroshi
Sasaki Takamitsu
Asahi Kogaku Kogyo Kabushiki Kaisha
Epps Georgia Y.
Robbins Thomas
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