| 摘要 |
The invention provides a device for securing the upper terminal positio n of a liftable and lowerable object, comprising cable means having a hoist-si de end and an object-side end; a stationary bracket having an aperture disposed in a substantially horizontal plane; a housing supported by the object-side end o f the cable means and carrying the object, the housing having a lower portion and an upper portion, at least the upper portion being configured to pass through t he aperture, a first opening at the top of the upper portion and a second openi ng at the bottom of the lower portion facilitating the passage of the cable means through the housing, and two oppositely located, elongated slots extending along at least parts of the upper portion; lever means located inside, and extendi ng through a substantial portion of, the housing, the lever means being pivotab ly mounted in the lower portion of the housing and being provided with catch means and camming means, the lever means having a first limit position in which the camming means protrudes through one of the elongated slots, and a second limit position in which said catch means protrudes through the other one of the elongated slots, and spring means adapted to act on the lever means and biasing the lever means towards the second limit position.
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