Patent ID: 7667187
Filing Date: 2010-02-23
Classification: G01D

Abstract:
1. A hollow-shaft encoder ( 1 ) and motor-shaft protective cap ( 2 ), which are repeatedly releasable from and connectable to each other by means of connection means ( 3 ), said encoder ( 1 ) incorporating all electrical and mechanical components for a pick-up and output of measuring signals and the protective cap having none of the electrical or mechanical components for the pick-up and output; wherein the encoder is housed in a casing; wherein the connection means ( wherein the protective cap ( wherein the encoder has first wings ( wherein the first and second wings constitutes the connection means ( wherein the first end of the encoder casing includes a depression ( wherein a portion of the first end of the protective cap and the second wings extend into the depression, the second wings extend under and engage the first wings when rotated in an assembled position so as to prevent the protective cap from being pulled off the encoder in the axial direction; wherein the annular transition region includes an annular groove and a sealing ring situated in the annular groove and contacting a portion of the encoder casing when the protective cap is engaged with the encoder casing; wherein the encoder is accommodated at least partially in an axial recess in the protective cap; and wherein means to accommodate a tool to remove the protective cap from the encoder is fixed on a second end of the protective cap.