The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
Oct. 19, 1999
Yosiaki Okamoto, Osaka, JP;
Takasi Uesugi, Osaka, JP;
Abstract
A chain block which can ensure free rotation of a hand wheel when the hand wheel is rotated in a hoisting direction in the state in which an overload protection mechanism is in operation and also can ensure the lowering of a load when the hand wheel is rotated in a lowering direction. The chain block includes an one-way mechanism that permits the hand wheel to freely rotate in the hoisting direction with respect to the first hub of the hand wheel and restricts the hand wheel freely rotating in the lowering direction. The one-way mechanism is composed of a spring and a pin received in a recess and a receiving portion formed in the inner periphery of the boss of the hand wheel and forming therein a slanted surface for guiding the pin received in the receiving portion to the inner periphery of the boss when the hand wheel is rotated in the hoisting direction and a retaining surface for retaining the pin in the inside of the receiving portion when the hand wheel is rotated in the lowering direction.