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 |
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.
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