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US Patent: 7,043,852
Measuring Instrument
Patentees: Shuuji Hayashida (exact or similar names) - Kawasaki, Japan Yuji Fujikawa (exact or similar names) - Kawasaki, Japan Yuichi Ichikawa (exact or similar names) - Kawasaki, Japan Osamu Saito (exact or similar names) - Kawasaki, Japan Nobuyuki Hayashi (exact or similar names) - Kawasaki, Japan Takahiro Nakamura (exact or similar names) - Kure, Japan Yuuzou Hashimoto (exact or similar names) - Kure, Japan Tomio Omori (exact or similar names) - Kure, Japan USPTO Classifications: 33/813, 33/814, 33/831 Tool Categories: layout tools : measurement gauges Assignees: Mitutoyo Corp. - Kawasaki, Japan Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Jun. 09, 2005 Granted: May 16, 2006 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: Oliff & Berridge, PLC - patent attorneys Abstract A measuring instrument that includes a tube 21 having a female thread 211 and a spindle 3 having a lead screw 31 screwing with the female thread 211 and capable of being advanced and retracted in an axial direction along with rotation around the axial center, and measures dimensions etc. of a workpiece according to displacement in an axial direction of the spindle 3 based on a rotation amount of the spindle 3. According to this measuring instrument, a pitch P of the lead screw 31 is twice as large or more than the difference between an external diameter R and a core diameter r thereof, and the difference between the external diameter R and the core diameter r is one-fifth or less of the external diameter R. Because of the lead screw 31 with the large pitch, the spindle 3 can be moved at high speed, thus enhancing operational performance of the measuring instrument. Application filed in Japan, 09 Jun 2003.

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