Machine element or mechanism – Elements – Cranks and wrist pins
Patent
1987-06-22
1989-07-11
Luong, Vinh
Machine element or mechanism
Elements
Cranks and wrist pins
74579R, 74597, 83628, 83530, 100 257, 100282, F16C 304, G05G 100, G30B 500, B26D 516
Patent
active
048460141
ABSTRACT:
A crankshaft mechanism for use with a press having a slide member which comprises an eccentric crankshaft having first and second cylindrical portions. The first portion is rotatable within a housing about a longitudinal axis and the second portion, of greater diameter than the first portion, has a center which is displaced radially from the longitudinal axis. An eccentric sheave is rotatably mounted on the outer circumference of the second portion of the crankshaft, and a connecting member is rotatably mounted on the outer circumference of the sheave. The second portion of the crankshaft, sheave and connecting member are provided with first, second and third radial bores respectively which are in alignment when the crankshaft is at its bottom dead center position. A locking pin slides within the radial bores and is displaceable by an actuator to a first position in which the crankshaft is connected to the sheave and a second position in which the sheave is connected to the connecting member. In the first position, the connecting member is free for movement with respect to the sheave and in the second position the sheave is free for movement with respect to the crankshaft. In addition, an auxiliary stop position correcting device is provided for stopping the slide member at a predetermined position.
REFERENCES:
patent: 3147638 (1964-09-01), Rice
patent: 3302505 (1967-02-01), Shiokawa
patent: 3765266 (1973-10-01), Carlise
patent: 3886829 (1975-06-01), Criblez
patent: 4135446 (1979-01-01), Bareis et al.
patent: 4156387 (1979-05-01), Portmann
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patent: 4748883 (1988-06-01), Portmann
patent: 4761988 (1988-08-01), Kato
patent: 4785732 (1988-11-01), Czapka et al.
patent: 4791830 (1988-12-01), Yamamoto et al.
Press Binran (Press Handbook) published by Maruzen Kabushiki Kaisha of Nihombashi, Chuo-ku, Tokyo, Japan on Oct. 30th, 1967, pp. 261-261, FIG. 3.26(W) and (X).
Shiga Masakatsu
Sugawara Masayoshi
Aida Engineering Ltd.
Luong Vinh
LandOfFree
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