Patent Application
20160076303
1. Field of Invention
The present invention relates to a winding wheel assembly for a curtain and, more particularly, to a cover unit of a winding wheel assembly.
2. Related Prior Art
As disclosed in U.S. Pat. No. 6,761,204, a winding wheel assembly includes an anchor dock 1, an axle 2, a pulley 3, an anchor lug 4 and a base 5. The anchor dock 1 includes two side boards 10 and 11. The side board 10 includes an opening 100, two arched notches 1000, two cavities 105 and 1060 and a stub shaft 102. The side board 11 includes an opening 110, two arched notches 1000, two wedge rods 115 and 116 and a stub shaft 112. The side boards 10 and 11 are joined. The wedge rods 115 and 116 are inserted in the cavities 105 and 1060 to precisely position the side board 10 relative to the side board 11. The axle 2 is formed with two struts 21. The axle 2 is inserted in the anchor dock 1. The struts 21 are inserted in the openings 100 and 110 to render the axle 2 rotatable in the anchor dock 1. A worm 30 is formed on a side of the pulley 3. Two stems 300 are formed on the worm 30. The worm 30 is inserted in the anchor dock 1. Each arched notch 1000 of the side board 10 matches with a corresponding arched notch 1000 of the side board 11 to form a circular opening for receiving a corresponding stem 300 to render the worm 30 rotatable in the anchor dock 1. The stub shafts 102 and 112 are inserted in a barrel 50 formed on the base 5 to render the base rotatable relative to the anchor dock 1. The anchor lug 4 includes a cover 42, a tubular element 40 formed at an edge of the cover 42, and a support block 41 formed at an opposite edge of the cover 42. A bolt 400 is inserted in the tubular element 40 and the side boards 10 and 11 to render the anchor lug 4 rotatable on the anchor dock 1. The use of the bolt 400 to rotationally connect the anchor lug 4 to the anchor dock 1 is however inconvenient because at least one tool is required to rotate the bolt 400.
Therefore, the present invention is intended to obviate or at least alleviate the problems encountered in prior art.
It is the primary objective of the present invention to provide a winding wheel assembly that can easily be assembled.
To achieve the foregoing objective, the winding wheel assembly includes a casing, a worm wheel, a worm, a pulley, a base and a cover unit. The casing includes a rod formed thereon and two barbs formed thereon. The worm wheel is inserted in the casing. The worm is engaged with the worm wheel. The pulley is connected to the worm and located out of the casing. The base is connected to the casing and located below the pulley. The cover unit includes a canopy for covering the pulley, a buckle engaged with the rod, and two barbs engaged with barbs of the casing.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of the preferred embodiment referring to the drawings wherein:
Referring to
The casing 10 includes two side boards 20 joined together. Each side board 20 is formed with an opening 22, a rod 24 and a barb 26. The rod 24 includes a free end. The free end of the rod 24 of one of the side boards 20 is preferably in contact with that of the rod 24 of the other side board 20. The barbs 26 extend parallel to each other.
The worm wheel 12 is inserted in the casing 10. Two axles 28 are formed on two opposite sides of the worm wheel 12. The axles 28 are inserted in the openings 22 to render the worm wheel 12 rotatable in the casing 10.
The pulley 14 is located out of the casing 10. A worm 30 is connected to the pulley 14. The worm 30 is rotationally inserted in the casing 10. The worm 30 is engaged with the worm wheel 12.
The base 16 includes a buckle 34 formed thereon. The buckle 34 is an arched element that extends for at least 180°.
The cover unit 18 includes a canopy 30, a lever 32, a buckle 36 and two barbs 38. The lever 32 extends from the canopy 30. The buckle 36 is formed at a free end of the lever 32. The buckle 36 is located near a lower face of the lever 32. The buckle 36 is formed with an arched upper face. The barbs 38 are formed on the canopy 30.
Referring to
The cover unit 18 is connected to the casing 10. The buckle 36 is placed beneath the rods 24. The barbs 38 are engaged with the barbs 26. Thus, the cover unit 18 is retained on the casing 10. Referring to
The present invention has been described via the detailed illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.
