| 摘要 |
A tool carrier assembly (100) comprising a main body (101), a quick hitch (102), and a rotatable locking device (103) between the quick hitch and the main body. The rotatable locking device employs releasable locking means (104,105) at opposite ends. A scroll plate (106), cylinder (107) and piston (108) which upon assembly is located inside the cylinder) are located between the releasable locking means (104,105). In normal operation the piston (108) is driven back and forth to tilt the hitch by reason of rotation of the cylinder as guide (109) travels in the helical guide way (110) of the scroll plate (106). The hitch is fixed to the cylinder and the main body is fixed to the scroll plate. The releaseable locking means (104) and (105) each comprise an internally tapered end cup (111), bearing (112), an unlock piston (113), a locking element (114) and a locking spring (115). The springs (115) bias the locking elements into the internal taper of the end cups (111) against the piston (113), the cylinder in this embodiment has an outward taper so the locking element wedges in as shown. In order to change the relative position of the tool and the main body the assembly must be unlocked, the pistons (113) are displaced toward each other releasing the locking elements and freeing the cylinder, the cylinder and piston are a double acting cylinder assembly so as fluid flows into and out of each side as desired the cylinder will rotate, upon reaching the required angle the unlocking fluid is relieved and the springs lock the assembly.
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