Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2002-03-13
2003-05-13
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
C160S17810R
Reexamination Certificate
active
06561254
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an angle adjusting device, and more particularly to a slat angle adjusting device for a Venetian blind and having a positioning plate.
2. Description of Related Art
With reference to
FIG. 4
, a conventional slat angle adjusting device (
50
) for a Venetian blind in accordance with the prior art comprises a body, and a roller (
56
). The body is securely positioned to the headrail (
70
) of the Venetian blind for the tilt rod (
72
) extending through the body. A transmission device (not shown) is arranged in the body and is connected to the tilt rod (
72
). The roller (
56
) is rotatably attached to the body and is operationally connected to the transmission device. A cord (
60
) is wound around the roller (
56
) and has two ends extending through a base (
54
) and the headrail (
70
). When the user pulls the cord (
60
), the tilt rod (
72
) will rotate through the transmissions of the roller (
56
) and the transmission device. Consequently, the angle of the slats of the Venetian blind will be adjusted.
To securely position the body to the headrail (
70
), a positioning bar (
52
) is formed on the top of the body and has two C-shaped ends adapted for engaging two upper bent portions of the headrail (
70
). However, it is found that the positioning effect provided by the positioning bar (
52
) is not enough for common use. When the user pulls the cord (
60
) with a large force, the body can slide along the headrail (
70
) and the position of the adjusting device (
50
) is changed.
To overcome the shortcomings, the present invention tends to provide a slat angle adjusting device to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a slat angle adjusting device for a Venetian blind to keep the slat angle adjusting device from sliding relative to the headrail of the Venetian blind. The slat angle adjusting device has a body, a roller, a transmission device, a positioning bar and a positioning plate. The roller is rotatably attached to the body for a cord being wound around the roller. The transmission device is received in the body and operationally connected to the roller. The positioning bar is integrally formed on the top of the body and has two ends adapted to engage with upper bent portions of a headrail of the Venetian blind. The positioning plate is pivotally attached to the top of the positioning bar. At least two engaging elements are formed on the positioning plate and are adapted to engage with the upper bent portions of the headrail. With such an adjusting device, the positioning plate can provide a further positioning effect to the adjusting device to keep the body from sliding relative to the headrail. The structural stability of the Venetian blind is improved.
REFERENCES:
patent: 3291194 (1966-12-01), Kirkley et al.
patent: 3357270 (1967-12-01), Spangenberg
patent: 4572267 (1986-02-01), Stein et al.
patent: 5031681 (1991-07-01), Dodich
patent: 5680892 (1997-10-01), Liu
patent: 255438 (1963-09-01), None
patent: 938992 (1963-10-01), None
Johnson Blair M.
Kamrath Alan
Rider Bennett LLP
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