| 摘要 |
The present invention relates to a bearing bracket for outer-wall Venetian blinds. The bearing bracket comprises a lifting roll (4) and a turning roll (13), these rolls being connected by a coupling (11, 19, 20) which during rotation of the lifting roll (4) in varying directions causes the turning roll (13) to be moved to various predetermined positions of adjustment for the skewing of the blind laths. The predetermined positions of adjustment corresponding to a completely open, completely closed and slightly open Venetian blind. The coupling (11, 19, 20) comprises a ratchet wheel (11) having two rows of ratchet teeth and two pawls (19, 20) for cooperation with one row each of ratchet teeth on the ratchet wheel (11). When rotating the lifting roll (4) the turning roll (13) is carried to the position corresponding to the predetermined positions of adjustment for the skewing of the blind laths. In said positions pawl (19, 20) is brought out of latching engagement with the corresponding set of ratchet teeth on the ratchet wheel (11) and the coupling is disengaged. A sleeve (50) is arranged around the ratchet wheel (11) and the ratchet wheel (11) is rotatable within the sleeve. The sleeve (50) has openings through which the teeth of the pawls (19, 20) can engage the teeth of the ratchet wheel. The sleeve (50) has two abutments of which during the rotation of the ratchet wheel (11) one or the other, depending on the direction of rotation, is brought into contact with the disengaged pawl (19, 20) and lifts it up so that its teeth are free from the teeth of the ratchet wheel (11).
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