Patent ID: 8646763

Claim:
A movable pole extension for a magnetic clamping apparatus ( 1 ) for holding a ferromagnetic workpiece (P), comprising: a fixed pole member ( 5 ) extending in a predetermined longitudinal direction (X-X) and at least two pole members ( 6 , 7 ) coupled to said fixed pole member ( 5 ), said at least two pole members ( 6 , 7 ) being movable relative to said fixed pole member ( 5 ), holder means ( 8 ) operably coupled to said fixed pole member ( 5 ), wherein said holder means ( 8 ): are movable in said predetermined longitudinal direction (X-X) between a first operating position (P 1 ) and a second operating position (P 2 ) and operate on said at least two movable pole members ( 6 , 7 ) to hold them in mating contact with said fixed pole member ( 5 ); wherein said holder means ( 8 ) include a hollow member ( 9 ) in slidably mating relationship with said fixed pole member ( 5 ), said hollow member ( 9 ) being able to hold at least one portion ( 5 A) of said fixed pole member ( 5 ) by a form fit between complementary profiles; wherein said hollow member ( 9 ) comprises an end wall ( 9 A) with side walls ( 9 B) extending therefrom in said longitudinal direction (X-X) to contain said at least one portion ( 5 A) of said fixed pole member ( 5 ).