G - Physics – 01 – B
Patent
G - Physics
01
B
33/112
G01B 5/20 (2006.01) B23Q 1/28 (2006.01) B23Q 5/58 (2006.01) G01B 5/008 (2006.01)
Patent
CA 1124054
380-78-0030 COORINATE MEASURING MACHINE HAVING A FAILSAFE PROTECTION SYSTEM ABSTRACT A coordinate measuring machine having an automatic failsafe protection system. The coordinate measuring machine includes a vertically mounted probe shaft which is preferably counterbalanced by an air counterbalance system. The automatic failsafe protection system insures that, in response to a loss of air pressure (or in response to other possibly unsafe conditions), the vertically-mounted, air-counterbalanced probe shaft will be prevented from falling down uncontrollably. The failsafe protection system includes a pair of members, with each member mounted adjacent to and on opposite sides of the probe shaft and urged toward engagement with probe shaft by a spring. Air under pressure from an air cylinder also acts upon the members to bias the members outwardly away from engagement with the shaft when normal (i.e. safe) operating conditions exist. An unsafe operating condition causes a decrease in air pressure from the cylinder which allows the spring to bias the members into contact with the probe shaft to brake its descent by progressively engaging the shaft. Additional springs also urge the members into contact with the probe shaft in response to an unsafe condition. The present invention overcomes the limitations and undesirable features of the prior art devices while providing a failsafe system which is relatively reliable and inexpensive, while not interfering with the functioning of a coordinate measuring machine in normal operation.
322631
Bell Frederick K.
Tuss John J.
Bendix Corporation (the)
Macrae & Co.
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