| 摘要 |
A braking device of a measuring instrument includes a body case and a spindle that penetrates the body case to be axially and reciprocably displaceable. The braking device includes a cylinder of which a first end is attached to the body case for accommodating a second end of the spindle, a piston provided on the second end of the spindle and accommodated to be reciprocably displaceable within the cylinder, a closing member provided on a second end of the cylinder to form a damper chamber between the closing member and the piston; a shaft connected to a side of the piston opposite to the spindle and penetrates the closing member; and a knob provided on a distal end of the shaft. A clearance is provided between the closing member and the shaft to circulate air.
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