| 摘要 |
The rescue spreading tool has a hydraulic cylinder (20) that produces a pushing and pulling action to pry open damaged vehicles at the scene of an accident. A stationary yoke (28) is attached to the cylinder and a pair of spreader arms (32) are also pivotally attached and are free to rotate in opposed directions. A pusher cam yoke (46) if formed integrally with the ram (22) within the cylinder and engages the arms pushing them apart when the ram is extended providing an initial cam action. A pair of toggle links (58) are attached on both the top and bottom of the arms and pusher cam yoke and continue to push the arms apart in an outward direction producing a secondary thrust after the initial cam action is completed spreading the arms to a maximum distance. When the ram is retracted the links close the arms through the secondary mode by reversing the procedure and continue to pull the arms together during the returning initial action, thereby completing the operational mode of the tool.
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