Patent Application
20220228431
The present invention relates to window blinds and more particularly, to a slat angle adjustment device for a window blind.
TW Publication No. 201905314 discloses a detachable slat angle adjustment mechanism that allows a consumer to assemble the second shaft member with the first shaft member by himself/herself after purchase, such that the second shaft member won't be exposed to the outside of the headrail during packaging or delivery, avoiding accidental damage of the second shaft member and prohibiting the second shaft member from damaging the slats.
According to the aforesaid prior art, the first shaft member is hidden in the casing, so the positioning holes can't be seen from the outside, causing the consumer to adjust repeatedly the assembly angle of the second shaft member until the positioning protrusions of the second shaft member are engaged with the positioning holes of the first shaft member. As such, the aforesaid prior art is inconvenient in assembly.
It is a primary objective of the present invention to provide a slat angle adjustment device for a window blind, which can increase convenience in assembly.
To attain the above objective, the slat angle adjustment device of the present invention comprises a casing, a transmission unit, and a driving rod. The top end of the casing has two through holes at two opposite sides thereof, and the bottom end of the casing has a bottom hole, a wing accommodation space located above the bottom hole and in communication with the bottom hole, and a flange located between the bottom hole and the wing accommodation space. The transmission unit has a first worm shaft rotatably disposed in the casing and a second worm shaft rotatably disposed in the casing. The first worm shaft is provided with a first shaft portion, a first worm tooth portion formed on the outer surface of the first shaft, portion and located between two end portions of the first shall portion inserted into the through holes of the casing, and a non-circular transmission hole passing axially through the first shaft portion. The second worm shaft is provided with a second shaft portion, a second worm tooth portion formed on the outer surface of the second shaft portion and meshed with the first worm tooth portion of the first worm shaft, and a first assembling portion connected with the bottom end of the second shaft portion. The driving rod has a second assembling portion located in the casing and assembled with the first assembling portion of the second worm shaft, a flexible wing provided with a top end thereof connected with the outer surface of the second assembling portion and located in the wing accommodation space of the casing and engaged with the flange of the casing, and a third shaft portion provided with a top end thereof connected with the bottom end of the second assembling portion. When the driving rod is assembled, the second assembling portion of the driving rod is inserted into the casing through the bottom hole of the casing. During the insertion of the driving rod, the flexible wing is compressed by the flange. Once the flexible wing passes through the flange, the flexible wing is restored and engaged with the flange, and simultaneously, the second assembling portion of the driving rod is assembled with the first assembling portion of the second worm shaft. By this way, the assembly of the driving rod is completed.
It can be understood from the above illustration that the slat angle adjustment device of the present invention allows a consumer not to adjust repeatedly the assembly angle of the driving rod, thereby reducing assembly time and increasing assembly convenience.
Preferably, when the flexible wing is compressed by the flange, a part of the flexible wing is received in a recess of the second assembling portion to avoid mutual interference between the flexible wing and the second assembling portion.
Preferably, the wing accommodation space has a truncated cone cross-section with a diameter decreasing gradually away from the flange.
Preferably, the second worm shaft has a dish portion connected between the second shaft portion and the first assembling portion and inserted into an annular groove of the casing so as to perform convenient assembly of the second worm.
Preferably, the first assembling portion is a polygon post, and the second assembling portion has a polygon hole matched with the polygon post. After the second assembling portion is assembled with the first assembling portion, they aren't be rotated relative to each other, such that the second worm shaft can be driven by the driving rod to rotate.
Preferably, the transmission hole has a semicircular cross-section for insertion of a transmission shaft with a semicircular cross-section, such that the transmission shaft can be driven by the first worm shaft to rotate.
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 casing 20 includes two half shells 21a, 21b fastened together. A through hole 22 is provided at each of left and right sides of the top end of the casing 20. The two through holes 22 are communicated with each other through a first accommodation space 23. Further, the casing 20 has a second accommodation space 24 at one side of the first accommodation space 23 and in communicating with the first accommodation space 23. As shown in
As shown in
As shown in
The driving rod 60 includes a second assembling portion 61, two flexible wings 64, and a third shaft portion 65. The second assembling portion 61 has a polygon hole 62. The flexible wings 64 are located at two opposite sides of the second assembling portion 61 and each have a top end thereof connected with the outer surface of the second assembling portion 61. The top end of the third shaft portion 65 is connected with the bottom end of the second assembling portion 61, and the bottom end of the third shaft portion 65 has a hook hole 66. As shown
It deserves to be mentioned that the second assembling portion 61 is provided with two recesses 63 at a bottom end thereof. As shown
As described above, the first worm shaft 40 and the second worm shaft 50 are mounted inside the casing 20, and the driving rod 60 is a separated component that is assembled with the casing 20 by means of the engagement between the flexible wings 64 and the flange 29, that is to say, the slat angle adjustment device 10 of the present invention allows a consumer to assemble the driving rod 60 with the second worm shaft 50 by himself/herself after purchase, so it is unnecessary for the consumer to adjust repeatedly the assembly angle of the driving rod 60, thereby reducing assembly time and increasing assembly convenience.
