US 7,354,066 B2
Counterweight device for construction machinery
Kazunori Yamamoto, Tsuchiura (Japan)
Assigned to Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd., Tokyo (Japan)
Filed on Jul. 07, 2005, as Appl. No. 11/175,283.
Claims priority of application No. 2004-200346 (JP), filed on Jul. 07, 2004.
Prior Publication US 2006/0103125 A1, May 18, 2006
Int. Cl. B62D 49/08 (2006.01)
U.S. Cl. 280—759  [280/760] 6 Claims
OG exemplary drawing
 
1. A counterweight device for a construction machine, utilized to mount a counterweight at a body frame of the construction machine, comprising:
two pairs of support plates, with one pair of support plates disposed at a right region of the counterweight and another pair of support plates disposed at a left region of the counterweight;
two brackets provided on the body frame, each of which is insertable between the two pairs of support plates;
a first engaging groove formed at an upper end of each of the two pairs of supports plates;
a second engaging groove formed at a lower end of each of the two brackets;
a first engaging pin projecting from a lower part of each of the two pairs of support plates, that engages at the second engaging groove when mounting the counterweight;
a second engaging pin projecting from an upper part of each of the two brackets, that engages at the first engaging groove when mounting the counterweight;
a pinhole formed between the first engaging groove and the first engaging pin of each of the two pairs of support plates;
a pinhole formed between the second engaging groove and the second engaging pin of each of the two brackets;
two hydraulic cylinders provided on the counterweight so as to raise/lower the counterweight relative to the body frame;
a rod pin provided at an upper end of the piston rod of each of the two hydraulic cylinders;
two pairs of cylinder brackets provided on the body frame, that extend rearward with respect to the body frame, and
a notch formed at an upper end of each of the two pairs of cylinder brackets at a position further rearward relative to a rear end of the body frame, that engages with the rod pin.