Measuring and testing – Inspecting
Patent
1996-12-26
1998-08-04
Raevis, Robert
Measuring and testing
Inspecting
G01R 104
Patent
active
057896852
ABSTRACT:
A device handler prevents a dropping of a device chuck mounted to a rotary arm owing to a breaking of a coil spring and a stoppage of the device chuck at an elevation in the mid way of vertical movements owing to a defect or failure of a linear guide, preventing the device chuck and/or an exit stage from being damaged or broken. A first guide rail is provided along a downwardly inclined camming surface of a cam member extending from the vicinity above a soak stage to a vicinity above a measuring section, and a second guide rail is provided along an upwardly inclined camming surface of the cam member extending from the vicinity above the measuring section to the vicinity above the exit stage. In addition, on the opposite side of a cam holder about the rotary shaft of the rotary arm unit is placed an arcuate dropping preventive plate mounted to the props depending from the ceiling insulation wall of the constant temperature chamber like the cam holder. Further, a hook is mounted to the upper portion of each of the device chucks. The hook can slide on any one of the first guide rail, the second guide rail, and the dropping preventive plate in the manner engaged therewith when an accident occurs.
REFERENCES:
patent: 3750878 (1973-08-01), Atchley et al.
patent: 5374888 (1994-12-01), Karasawa
Advantest Corporation
Raevis Robert
LandOfFree
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