Patent Application
20230383594
The present invention relates to a venetian blind and more particularly, to a ladder rope retaining device for a venetian blind.
As far as a venetian blind is concerned, when all slats are lowered, they are adapted to be driven by a ladder rope to tile relative to a headrail for providing a light-blocking effect. To go a step further, the top end of the ladder rope is fixed to a rotating base. When the rotating base is driven by a driving shaft to rotate relative to a support base, the ladder rope is driven synchronously by the rotating base, such that all slats are driven by the ladder rope to tilt relative to the headrail. However, the conventional rotating base is rotated relative to the support base in a smooth manner. This will cause a poor operating feel during adjusting angle of the slats.
It is a primary objective of the present invention to provide a ladder rope retaining device for a venetian blind, which has a clear operating feel during operation.
To attain the above objective, the ladder rope retaining device of the present invention comprises a support base and a rotating base. The support base includes a bottom wall and two straight walls connected with two opposite sides of the bottom wall. Two ends of the bottom wall each have an elastic support portion protruding out of the bottom surface of the bottom wall. The straight walls both have pivot troughs. The periphery wall of one of the pivot troughs has a positioning hump. The rotating base includes a pivot pivotally disposed in the pivot troughs of the support base and a ladder rope retaining portion formed on the outer surface of the pivot. The outer surface of the pivot has a plurality of the positioning recesses arranged in an equally-spaced manner.
It can be seen from the above that when the rotating base is rotated relative to the support base, the positioning recesses are alternately engaged with and disengaged from the positioning bump. When the positioning recesses are disengaged from the positioning bump, the support base becomes deformed elastically through the elastic support portions. By this way, the ladder rope retaining device of the present invention has a clear operating feel during operation.
Preferably, the pivot has a shaft portion pivotally disposed in the pivot troughs of the support base and provided with the positioning recesses, and two disk portions connected with two ends of the shaft portion and located at the outside of the straight walls of the support wall. The diameters of the disk portions are greater than the diameter of the shaft portion and the diameters of the pivot troughs, such that the pivot can be prevented from separating from the pivot troughs along its axial direction.
Preferably, the rotating base further includes a driving hole penetrating through the shaft portion. The rotating base can be driven to rotate by a driving shaft engaged with the shaft portion.
Preferably, the bottom wall further has two hallow portions adjacent to the elastic support portions for facilitating the elastic deformation of the elastic support portions.
Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure.
Referring to
The support base 20 includes a bottom wall 22 and two straight walls 24. Two ends of the bottom wall 22 each have an elastic support portion 26 and two hollow portions 27. The elastic support portions 26 protrudes out of the bottom surface of the bottom wall 22. The hollow portions 27 are adjacent to two opposite sides of one of the elastic support portions 26 tier facilitating the elastic deformation of the elastic support portions 26. The straight walls 24 are integrally connected with two opposite sides of the bottom wall 22, and the straight walls 24 each have a pivot trough 28 with an opening facing upwards. The periphery wall of one of the pivot troughs 28 has a positioning bump 29. As shown in
The rotating base 30 includes a pivot 31 and a ladder rope retaining portion 35. The pivot 31 has a shaft portion 32 and two disk portions 33. The outer surface of one end of the shaft portion 32 has a plurality of positioning recesses 34 arranged in an equally-spaced manner. The disk portions 33 are integrally connected with two ends of the shaft portion 32, and the disk portions 33 have diameters greater than the diameter of the shaft portion 32 and the diameter of the pivot trough 28. The ladder rope retaining portion 35 is integrally connected with the outer surface of the shaft portion 32, and the outer surface of the ladder rope retaining portion 35 has two slots 36. One end of each of the slots 36 is connected with a retaining hole 37. As shown in
It can be seen from the above that when the rotating base 30 is rotated relative to the support base 20, the positioning recesses 34 are alternately engaged with and disengaged from the positioning bump 29 of the support base 20, As the rotating base 30 is rotated until the positioning recesses 34 are disengaged from the positioning bump 29, as shown in
