Patent ID: 6792690
Filing Date: 2004-09-21
Classification: G01B

Abstract:
An inside micrometer, comprising:an inside micrometer body including a cylinder having a first end, a second end and a first through-hole therebetween, the inner circumference of the first through-hole being provided with an internal thread, a first spindle screwed to the internal thread in an advanceable and retractable manner from the first end of the first through-hole, and a thimble provided on the outside of the cylinder, the thimble being capable of rotating integrally with the first spindle; a first extension member having a third end, a fourth end and a second through-hole therebetween, the third end of the first extension member attachable and detachable from the second end of the cylinder; a plurality of anvils having different lengths in increments of a predetermined dimension, each anvil attachable and detachable from the fourth end of the first extension member when the first extension member is attached to the second end of the cylinder and attachable and detachable from the second end of the cylinder when the first extension member is detached from the second end of the cylinder; and a second extension member attachable and detachable from first end side of the thimble the second extension member having a second spindle which advances and retracts relative to the second extension member together with the first spindle when the second extension member is attached to the first end side of the thimble, wherein the first spindle and the second spindle are in direct contact with each other.