1. Field of the Invention
The present invention relates to a slat rotation, slat winding and unwinding control device of window blind, more particularly to a slat rotation, slat winding and unwinding control device of window blind in which the base can be easily assembled, no limitation is placed upon the winding direction of the pull cord on the cord spool, and either a connecting strap or a connecting string is easily to be fixed on a housing member.
2. Brief Description of the Prior Art
Ordinarily, conventional control device for controlling the opening-closing of slats and lifting or lowering of a window blind are shown in
Although the above control device can control the opening or closing of each slat and the lifting or lowering of the window blind, however, some drawbacks has been found in practical implementation.
1. The base of the control device can only be fitted inside from the lateral side of the upper beam of the window blind for further combination. If the width of the window blind is wider, i.e., the support rod is longer, it is difficult to fit the control device into the upper beam.
2. A flange stopper is formed at the end of the cord spool for preventing the cord spool from swinging out beyond the fitting member to fall off. So, when the cord spool is rotated to the end in one direction, a big impact force will be produced if force continues to be applied. In this case, the cord spool is blocked by the flange stopper and is unable to continue the rotation, so the cord spool only can rotate back in reverse direction. This may result in limitation on its usage and thus may cause inconvenience.
3. The connecting string for connecting each slat of the window blind has to be wound around the locating bar and then placed in the locating recess at the top end of the housing member and finally is fixed in the locating hole of the locating recess so that the connecting string with the locating bar is fixed in place. It seems the process is troublesome and inconvenient.
In the slat rotation, slat winding and unwinding control device of window blind of the present invention, the base has flexible snap fit portions provided at the outside of its both ends, so that the base can be fixed directly into the interior of the upper beam from the upper side thereof by the engagement of the flexible snap fit portions. Therefore, the mounting of the base into the upper beam is easy and convenient. Further, the cord spool is accommodated between the cavity portion of the fitting member and the upper cover, so that the cord spool can continue its rotation within the fitting member, hence there is no limitation on the winding direction of the pull cord. The fitting member together with the cord spool is fitted in the hollow portion of the housing member. The shaft portion at one end of the housing member is pivotally fitted in the pivot hole of the base, and the shaft portion at the other end is fitted in the axial bore of the rotation member. After fitted with the torsion spring over the outside, the other end of the rotation member is pivotally fitted in the pivot hole of the base so that a connecting strap for connecting each slat of the window blind is fixed in the locating recess by the direct fastening of two screw elements through the lid; or a connecting string for connecting each slat of the window blind is placed in the clipping grooves provided at both sides of the locating recess and then the connecting string is similarly fixed in the locating recess by the direct fastening of two screw elements through the lid. Therefore, either the connecting strap or the connecting string is easily to be fixed on the housing member. In this manner, easiness and handiness in operation can be further enhanced in its overall implementation.
The base (1) has flexible snap fit portions (11) provided at the outer sides of both ends, and the base (1) can be fixed directly into the interior of the upper beam (6) of the window blind from the upper side thereof by the engagement of the flexible snap fit portions (11) (also referring to
The fitting member (2) has a major body (21) with a cavity portion (211) provided in its middle part. Bearing portions (212) are provided at both ends of the major body (21). Further, two female snap-fit portions (213) are formed at the outer edges of one end of the major body (21). An upper cover (22) is provided at the upper end of the major body (21); a bearing portion (221) is formed at one end and two male snap-fit portions (222) corresponding to the female snap-fit portions (213) of the major body (21) are formed at the other end of the upper cover (22). Therefore, the upper cover (22) can be combined with the major body (21) by the engagement between the male snap-fit portions (222) and the female snap-fit portions (213).
The cord spool (3) can be received between the cavity portion (211) of the major body (21) and the upper cover (22) of the fitting member (2). A pull cord fixed part (31) is provided at the outer edge of the cord spool (3) for tying a pull cord (32). Axle portions (33) corresponding to the bearing portions (212), (221) of the major body (21) and of the upper cover (22) are respectively provided at both ends of the cord spool (3), so that the cord spool (3) can rotate in the fitting member (2) by the mutual fitting between the axle portions (33) and the bearing portions (212), (221) of the major body (21) and of the upper cover (22).
The housing member (4) is formed with a hollow portion (41) corresponding to the fitting member (2) so as to house the fitting member (2) therein. Two shaft portions (42) are respectively formed at both ends of the housing member (4), one of the shaft portions (42) is pivotally fitted in the pivot hole (12) of the base (1) and the interior of this shaft portion (42) can be penetrated through by a axle rod (421) which is also fitted into the inside of the axle portions (33) of the cord spool (3). A locating recess (43) is provided at the upper surface of the housing member (4), and two clipping grooves (431) are provided at both sides of the locating recess (43). A lid (44) is fastened by two screw elements (441) to cover the locating recess (43). A protruding portion (45) corresponding to the rotation member (5) is further provided on the housing member (4).
The rotation member (5) has an axial bore (51), corresponding to the shaft portion (42) at the other end of the housing member (4), provided at one end, so that the rotation member (5) can be fitted on the outside of the shaft portion (42) by the axial bore (51). The other end of the rotation member (5) is pivotally fitted in the pivot hole (12) of the base (1). A torsion spring (52) is fitted on the outside of the rotation member (5), and the torsion spring (52) is stopped by the protruding portion (45) of the housing member (4).
In this manner, referring to
Referring to
Based on the above description of the structural constitution and the implementation of the present invention, the present invention has the following advantages, when compared with prior art.
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Number | Date | Country | |
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20130340952 A1 | Dec 2013 | US |