| 摘要 |
<p>A displacement measuring instrument includes a spindle (10) screwed to a stationary sleeve (20), a thimble (30), an operation sleeve (40), and a constant pressure mechanism (50). The constant pressure mechanism (50) includes: a rotary driving element (51) rotatable together with the operation sleeve; a rotary driven element (52) coupled to the rotary driving element in such a manner as to be rotatable together with the rotary driving element but not to be rotatable when a predetermined or more load is applied to the spindle; and a rotation transmitting mechanism (53) transmitting a rotation of the rotary driven element to the spindle. A male thread portion (23) with the same pitch as that of a male thread portion (12) of the spindle is formed on the outer circumference of the stationary sleeve. A female thread portion (31) is formed on the inner circumference of the thimble and screwed to the male thread portion of the stationary sleeve.</p> |
