| 摘要 |
A lifting vehicle (1) such as a forklift truck comprises a lifting device (7) such as lifting forks movably mounted on a mast (6). The mast (6) is secured to a chassis (2) of the vehicle (1). Raising and lowering of the lifting device (7) on the mast (6) is controlled by a lift cylinder (8) and tilting of the mast (6) forward and backward out of a vertical position is controlled by a tilt cylinder (9). The tilt cylinder (9) is mounted by fastenings (24; 28) between a part (10) of the chassis (2) and the mast (6). A load monitor (13) comprising a strain gauge (14) is mounted on a bridge (18) that is secured at each end to locations that are either on said part (10) of the chassis (2) or on the mast (6) adjacent the fastening (24; 28 ) for the tilt cylinder (9). An indicator (16) is provided that is in communication with the load monitor (13) in order that it can signal an output of the load monitor (13) to an operator of the vehicle (1). As the strain gauge (14) is secured to a part of the vehicle (1) which is stressed by the loads being carried, the load monitor (13) is able to measure the stress being imposed on the vehicle (1). However, as the locations to which the ends of the bridge (18) are secured are static with respect to one another, the readings are not distorted by torsional and shear forces. This enables not only to the weight of a load (12) to be detected but also the stability of the vehicle (1) as a whole to be judged and thereby an indication to be given to an operator of the vehicle if there is any risk of overloading of the vehicle or a tip-over accident occurring. |
