Geometrical instruments – Gauge – Coordinate movable probe or machine
Patent
1987-12-28
1989-01-24
Haroian, Harry N.
Geometrical instruments
Gauge
Coordinate movable probe or machine
33 1M, G01B 520
Patent
active
047993162
ABSTRACT:
A coordinate measuring machine (10) having a pneumatic probe counterbalance system housed within the probe shaft (14) is disclosed, the system including a piston (54) fit into a cylinder (30) extending along the length of the probe shaft (14). The piston (54) is fixed so that air pressure acts on a cylinder end cap (32) to counterbalance the weight of the probe assembly (12). A stationary tube (34) extends into the cylinder (30) from above the piston (54) and directs a source of regulated air pressure to the cylinder interior (58) from a fluid pressure fitting (48) connected to the upper end of the tube (34). The piston (54) is at least partially spherically shaped and the tube (34) is supported by a spherical bearing (42) to accommodate misalignment of the tube (34) and cylinder (30) without binding during movement of the probe shaft (14). A length of wire (56) is connected at one end to the piston (54) and extends upwardly through the tube (34), and is fixed at its upper end to anchor the piston (54).
REFERENCES:
patent: 4507868 (1985-04-01), Tuss
patent: 4631834 (1986-12-01), Hayashi et al.
Benefiel John R.
Eifler Raymond J.
Haroian Harry N.
The Warner & Swasey Company
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