Automatic readout micrometer

An apparatus for taking measurements including:

• a first arm;
• a second arm;
• means for mounting the second arm to the first arm;
• means for positioning the second arm with respect to the first arm;
• means for electronically measuring the change in position of the second arm with respect to said first arm;
• wherein one of said arms is mounted concentrically about the other of said arms;
• wherein said measuring means includes a tape connected to both said arms;
• wherein said positioning means includes a hollow shaft;
• and
• wherein said concentric arms are positioned about said shaft and said tape is positioned through said shaft.

An apparatus for taking measurements including:

• a first arm;
• a second arm;
• means for mounting the second arm telescopingly to the first arm wherein the second arm can be positioned with respect to the first arm;
• means for electronically measuring the change in position of the second arm with respect to the first arm, which means include a tape which is operationally associated with each said arm, and
• wherein one of said first and second arms is disposed about the other said arm and wherein said other arm defines a channel, the apparatus further including a means for positioning said second arm with respect to said first arm, wherein at least a portion of said positioning means is positioned in said channel and wherein said positioning means defines a channel wherein a position of said tape is received in said channel of said positioning means.

A measurement system including a laser means for emitting a laser beam, a fiducial point and means for determining the distance between the laser beam and fiducial point, which means includes:

• a first arm;
• a second arm;
• means for mounting the second arm telescopingly to the first arm;
• means for impositively positioning the second arm with respect to the first arm wherein said impositively positioning means includes means for slippingly varying the position of said second arm with respect to said first arm and means including coarse and fine adjustment means for rollingly varying the position of said second arm with respect to said first arm;
• means for electronically measuring the change of position of the second arm with respect to their first arm including a tape operatively associated with each of said arms;
• a laser beam-sensing target mounted to one of said arms;
• means for displaying and recording the measured change of position of the second arm;
• and
• means for comparing the measurement with a datum.