| 摘要 |
Strain gauges 18 are attached to the piston rod 12 of fluid motor 10 which supports load-bearing boom 6 for sensing and measuring the state of compression of the rod 12, and hence the load supported by boom 6. Strain gauges 18 are mounted to the external portion of the rod 12 extending between the boom member 6 and the motor cylinder 14, and function to continuously measure the degree of compression in the rod. Further electrical means is disclosed for interpreting the output from the strain gauges as the weight of the load which the boom is lifting. By measuring the mechanical strain in the system instead of the fluid pressure in the cylinder variations in readings caused by the effects of external factors on the fluid are avoided. The piston rod provides a relatively unexposed location for the strain gauges. <IMAGE> |
