Patent Number: 8,720,076

Title: Concentricity test device

Abstract: A concentricity test device includes a bracket, a positioning member, an operation member, and a probe indicator. The bracket includes a beam, and opposite first and second supporting arms. The positioning member is pivotably connected to the first supporting arm and includes a shaft. A pierced round workpiece is placed around the shaft. The operation member is pivotably connected to the second supporting arm and includes a pole detachably locked to the shaft. The probe indicator is fixed to the beam, and includes a spring-loaded probe and a gauge head connected to the probe to engage with a circumference of the workpiece. The pole, the shaft and the workpiece are rotated 360 degrees, values shown by the probe indicator show moving distances of the probe, and a maximal difference value of the moving distances of the probe reveals the concentricity of the workpiece.

Inventors: Zhang; Bing-Jun (Shenzhen, CN)

Assignee: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd.

International Classification: G01B 5/20 (20060101)

Expiration Date: 5/13/12018