Patent ID: 8746421
Filing Date: 2014-06-10
Classification: H02K

Abstract:
1. A blocking device ( 30 ) for blocking a rotary motion of a shaft ( 14 ) relative to a housing ( 16 ) of a gear-drive unit ( 10 ) in a blocking state, the blocking device ( 30 ) having a first blocking element ( 32 ) and a second blocking element ( 34 ), where the second blocking element ( 34 ) is displaceable relative to the first blocking element ( 32 ) using an electromagnet ( 44 ) and a restoring element ( 42 ), wherein the blocking elements ( wherein each radially extending indentation and raised area pair on one blocking surface is positioned to oppose each radially raised area and extending indentation pair on the other blocking surface, enabling the blocking elements to mesh with one another in an axial direction and in a form-locking fashion to block the rotary motion of the shaft ( wherein the blocking device ( wherein the first blocking element ( wherein the first blocking element (