Chain – staple – and horseshoe making – Chain making – Sprocket chain
Reexamination Certificate
2005-05-03
2005-05-03
Jones, David (Department: 3725)
Chain, staple, and horseshoe making
Chain making
Sprocket chain
C059S901000, C305S202000, C305S203000, C029S520000
Reexamination Certificate
active
06886323
ABSTRACT:
In a crawler belt comprising pairs of opposite links connected endlessly via pins press-fitted into the links, fixing surfaces of pins or links are successively pressed and deformed from the fixing surfaces in an axial direction along the circumferences inside or outside of openings of pin-press-fitting holes by means of local pressing in the axial direction, whereby the end portions of the pins or part of the circumferences of the openings in the links are expanded or narrowed in diameter. The expanded or narrowed portions are fixedly engaged with the opposing engaging spaces. The surface hardness of the expanded or narrowed portions is set to be lower than that of the other portions. With such structure and method, the links and pins can be easily and firmly connected with sufficient holding force in the axial direction, securing accurate, quick and easy fixing of pins and assembling of pins and links.
REFERENCES:
patent: 3699637 (1972-10-01), Rosiek
patent: 4125298 (1978-11-01), Heurich et al.
patent: 5183318 (1993-02-01), Taft et al.
patent: 5201171 (1993-04-01), Anderton et al.
patent: 6270173 (2001-08-01), Hashimoto et al.
patent: 6457304 (2002-10-01), Bedford et al.
patent: 5-213237 (1993-08-01), None
patent: 2000-153789 (2000-06-01), None
Everest Intellectual Property Law Group
Jones David
Komatsu Limited
Leonard Michael S.
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