Device for gripping and hoisting packed sacks

A device for gripping and hoisting packed sacks, said device comprising:

• a contrivance for mounting said device onto a hoisting machine;
• load bearing members each having two ends, one of said two ends of each load bearing member being rigidly coupled to the contrivance for mounting said device onto said hoisting machine;
• slots defined in the other free ends of the load bearing members, the longer faces of said slots are in a position of angularity with end faces of said load bearing members;
• vertical plates hinged on said load bearing members;
• a first rod rigidly fixed by its ends in said vertical plates;
• a second rod mounted parallel to said first rod in said slots of said load bearing members, said second rod being hollow and being filled with ballast whose mass is equal to that of an empty sack;
• an actuator for imparting a turning motion to said vertical plates;
• and
• a mechanism for restricting the load upon said actuator that imparts turning motion to the vertical plates, said mechanism being mounted on said load bearing member and being kinematically associated with said second rod.

A device for gripping and hoisting packed sacks, said device comprising:

• mounting means for mounting said device onto a hoisting machine;
• load bearing members each having two ends and each load bearing member being rigidly coupled to said mounting means at one of said two ends;
• slots defined at the free ends of said load bearing members, said slots extending in a direction at an angle to end faces of said load bearing members;
• vertical plates hinged on said load bearing members;
• a first rod rigidly fixed by its ends to said vertical plates;
• a second rod mounted in said slots parallel to said first rod;
• actuating means for moving said vertical plates to turn said first rod;
• and
• load means for restricting the load upon said actuating means, said load means being mounted on said load bearing members and being kinematically associated with said second rod so that when said actuator means moves said first rod to displace said second rod and a sack, load means relieves pressure exerted on said actuator means by said first rod having displaced said second rod and said sack.