Convertible bucket attachment capable of excavation and clasping

Claim 1

A convertible bucket attachment for excavation and clasping adapted to be rockingly mounted to an arm which in turn is rockingly connected to a boom of an excavator machine, comprising: a bucket portion 10 consisting of a bucket proper 1 and a complementary sub-bucket 2 pivotally engaged in the upper ends for a rocking movement by a pair of common pivot apertures 5,5 for connection of said bucket portion to the distal end of the arm of an excavator machine; a pair of upper stays 4,4 disposed in said proper bucket 1 and each having an upper link aperture; a pair of upper link members 16,16 each having one end pivotally secured in said upper link aperture and the other end pivotally secured to the distal end of a plunger rod; a pair of sub-link members 14,14 each having one end pivotally secured to one another opposed side plates of the arm and the other end pivotally secured to one another of said upper link members for association therewith; and a pair of lower link members 15,15 each having one end pivotally secured to said sub-bucket 2 substantially below said common pivot aperture and associated with said upper link members and said sub-link members; thereby forming a link arrangement which is adapted to be actuated by one single cylinder actuator 13 to allow said bucket proper 1 and said sub-bucket 2 to perform operations of excavation and clasping.