HAMMER GRAB

PROBLEM TO BE SOLVED: To provide a hammer grab capable of decreasing frictional resistance of a swivel mechanism. SOLUTION: A hanging shaft body 2 comprising upper-side large-diameter shaft portion 3 and a lower-side small-diameter shaft portion 4 is provided: a cylindrical base frame 5 rotatably coupled via a thrust bearing 6 is suspended on the large-diameter shaft portion 3 of the hanging shaft body 2; an external cylinder member 8 constituting a swivel mechanism 7 is rotatably fitted to the small-diameter shaft portion 4 using the small-diameter shaft portion 4 as an internal cylinder member; a cylindrical body frame 9 is suspended and coupled to the lower portion of the cylindrical base frame 5; shells 11 and 11 are pivotally attached to the lower end side of the cylindrical body frame 9; a cylinder 12 for driving the opening/closing of the shell is installed in the cylindrical body frame 9; an ascending/descending frame 13 is provided below the cylinder 12; the cylinder 12 is interlocked with and coupled to the ascending/descending frame 13; the ascending/descending frame 13 and the shells 11 and 11 are interlocked and coupled together by a link mechanism 14; and the shells 11 and 11 are opened/closed by lifting and lowering the ascending/descending frame 13 by a telescopic operation of the cylinder 12. COPYRIGHT: (C)2011,JPO&INPIT