Patent ID: 7478490

Claim:
Device for attaching a first instrument or tool part ( 3 - 5 ) to a second part ( 2 ) in the form of a beam or on a working machine, comprising first ( 17 ) and second ( 7 ) engagement means respectively fixed to one of the first ( 3 - 5 ) and second ( 2 ) parts, said first ( 17 ) and second ( 7 ) engagement means structured and arranged on the respective parts ( 2 - 5 ) to be driven into engagement with each other such that the parts ( 2 - 5 ) are thereby held attached to each other under the force of gravity of the first part ( 3 - 5 ) upon the second part ( 2 ), said first ( 17 ) engagement means include a male engagement member having external surfaces ( 14 , 15 ) converging towards each other, said second ( 7 ) engagement means include a female member having internal surfaces ( 8 , 11 ) converging towards each other in a corresponding way to said external surfaces ( 14 , 15 ) of said first engagement means ( 17 ), to receive and hold said first engagement means ( 17 ) in said second engagement means ( 7 ) under the influence of the gravitational force of the first part ( 3 - 5 ) upon the second part ( 2 ) to push said external converging surfaces ( 14 , 15 ) substantially in the direction of convergence against said internal converging surfaces ( 8 , 11 ) and into a fixed position in which said respective externally ( 14 , 15 ) and internally ( 8 , 11 ) converging surfaces fit tightly together, and an arrangement to fixedly lock the second part ( 2 ) to the first part ( 3 - 5 ) and with a recess ( 19 ) in a surface ( 8 ) of one ( 3 - 5 ) of the parts ( 2 - 5 ), and comprising a wedge element ( 20 ) movably arranged on the other ( 2 ) of the parts ( 2 - 5 ), means ( 25 ) for inserting said wedge element ( 20 ) in the recess ( 19 ) such that surfaces of said wedge element ( 20 ) are pressed against walls of the recess ( 19 ) and locking said wedge element ( 20 ) non-movably in the recess ( 19 ), resilient means ( 24 ) arranged to be compressed, store potential energy and only act on said wedge element ( 20 ) to press said wedge element ( 20 ) into the recess ( 19 ) during biasing of said resilient means ( 24 ) by said inserting means ( 25 ) in said locked position, and not act upon said wedge element ( 20 ) in absence of such biasing by said inserting means ( 25 ), such that said wedge element ( 20 ) remains retracted, and said inserting means ( 25 ) are positioned between said wedge element ( 20 ) and said resilient means ( 24 ).