| 摘要 |
An expander device, particularly for use in expanding springs, piston rings, circlips and similar objects, comprises a support member and an actuating member which are pivotally connected to one another and equipped with handgrip portions. A pair of expanding jaws is mounted on the support member for pivoting in a plane which is parallel to the axis of pivoting of the actuating member relative to the support member. A transmission converts the pivoting of the actuating member into spreading apart of the jaws, the transmission including a ratchet mechanism which includes a toothed rack mounted on a guide track for movement in the frontward direction of the device, a transporting pawl which is actuated by the actuating member so as to engage the teeth of the rack and to move the latter, and an arresting pawl which arrests the rack against movement in the rearward direction of the support member. Connecting links are pivoted to the rack, on the one hand, and to the jaws, on the other hand and cause the jaws to spread apart as the rack moves in the frontward direction so as to expand an object extending between the free ends of the jaws. The jaws may include separate lever and jaw elements, and additional connecting links may be provided which pivotally connect the respective jaw element with the other lever element on which the other jaw element is pivoted. The additional links may be guided on the other lever elements in elongated slots, and arrested in a plurality of positions in such slots.
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