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:
Aug. 14, 2001
Filed:
Aug. 19, 1999
Ei Takahashi, Tutchiura, JP;
Ryohei Suzuki, Yasato-machi, JP;
Toshio Hasegawa, Ibaraki-machi, JP;
Hiroshige Kurosaka, Minori-machi, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A joint pin lock system or mechanism for a pivotal pin joint which connects one mechanical structural member between a pair of bracket portions of another mechanical structural member pivotally relative to each other by means of a joint pin passed through a connecting end portion of one mechanical structural member and the bracket portions of the other mechanical structural member. For locking the joint pin in a fixed state at least in rotational directions, the joint pin lock mechanism includes a collar portion which is provided fixedly at and around one end of the joint pin and extended along the outer side of one bracket in a direction perpendicular to the axis of the joint pin, a locking slot which is formed in the collar portion in such a way as to have a longitudinal center line in an intersecting direction relative to a center line of the joint pin, a seating member which is securely fixed to the bracket, and an anti-rotation block which is fitted on the seating member for engagement in the locking slot of the collar portion. The anti-rotation block is substantially of a square shape having a width approximately same as that of the locking slot and a length shorter than that of the locking slot.