Pneumatic counterbalance for a coordinate measuring machine

Details Pneumatic counterbalance for a coordinate measuring machine Pneumatic counterbalance for a coordinate measuring machine

1981-08-10

1983-06-28

Little, Willis

Geometrical instruments

Miscellaneous

Light direction

33169R, 33DIG2, 33174L, G01B 520

Patent

active

043897819

ABSTRACT:
A coordinate measuring machine (10) having a vertically movable probe (41), the weight of which is offset by an improved pneumatic counterbalance (50). The pneumatic counterbalance system (50) is adapted to use a source of pressurized air (72) acting upon a ball piston (54) which is directly connected to a probe arm (42) which supports the probe (41). An accumulator (60) having a capacity large enough to insure only a small change in the counterbalanced force as the ball piston (54) moves within its cylinder (52) is provided. A valve (70) is provided in the connection of the air supply (72) to the accumulator (60). The valve (70) is adjusted to provide make up air for the air which leaks past the ball piston (54). Preferably, the accumulator (60) is formed as a pressurized plenum (60) which surrounds the cylinder (52).

REFERENCES:
patent: 3818596 (1974-06-01), Stemple et al.
patent: 3840993 (1974-10-01), Shelton
patent: 4155173 (1979-05-01), Sprandel

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