Patent ID: 6068145
Filing Date: 2000-05-30
Classification: B66C

Abstract:
An anti-two block system for a crane comprising:a body having means for connecting to a boom of the crane;a weighted member connected to said body, said weighted member having means for contacting a travelling member of the crane when the travelling member moves upwardly beyond a desired level, said body comprising:a first plate having means thereon for connecting to the boom of the crane; anda second plate slidably connected to said first plate, said second plate being connected to said weighted member; anda valve means affixed to said body, said valve means movable between a first position closing said valve means and a second position opening said valve means, said valve means for controlling fluid flow therethrough in response to a contact between the travelling member and said weighted member, said second plate having an opening formed therein, said valve means affixed to said first plate, said valve means positioned within said opening of said opening of said second plate.