| 摘要 |
<p>A shearing tool comprises a reference handle (10), a reference blade (14) rigidly connected to the reference handle (10), a control handle (12) and a slave blade (16) mounted at a common pivot assembly to the junction of the reference handle (10) and reference blade (14). A hydromechanical semi-rotary actuator is incorporated in the pivot assembly. The actuator comprises a housing (24) to which the reference handle (10) and blade (14) are rigidly connected, and a bushing (26) rotatable within the housing (24) and to which the slave blade (16) is rigidly connected. The bushing (26) has a vane (30) which partitions an arcuate hydraulic chamber (28) formed between the housing (24) and the bushing (26). A spool (38) rotatable within the bushing (26) and connected to the control handle (12) has supply and return cavities (40, 42) for hydraulic fluid which by manual operation of the handles (10, 12) are placed in communication with the arcuate chamber (28) through ports (56, 58) in the bushing (26). A differential driving torque is thus developed on the vane (30) to cause the blades (14, 16) toperform a powered shearing action.</p> |
