| 摘要 |
A coupling device primarily for use in attaching trowelling blades to the arms of a cement finishing machine. The coupling allows for ready removal and attachment of the blades, allows for reversal of their position through 180 DEG , and in particular provides a dirt excluding seal around the movable parts of the device. The coupling includes upper and lower parts, one of which has a wall the periphery of which seals against the other part, and the interlocking coupling parts are disposed within this wall thus being protected from ingress of dirt. The interlocking parts include catch elements on the lower part, and a locking bar slidable in the upper part to engage the catch elements and which is also movable by handle operated screw means towards and away from the upper part so that when the catch elements are engaged the two parts can be tightly fastened together by turning the handle to draw the locking bar inwardly towards the upper part.
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