5009. Cable mechanism for controlling stage curtains || Download free 3D cad models

This perfect model is made by Mr. Thang

You help us to design faster. THANK YOU SO MUCH !!!!!! 

Pull one or another of red cable branches to lift or lower the curtain that are represented by violet waved bars.
The lower end of each brown cable is fixed to lower side of the curtain. The upper end of each brown cable is fixed to multi-groove pulley. The brown cables pass through button-holes of the curtain.
The lower end of blue cable is fixed to the grey contra-weight.
The upper end of blue cable is fixed to the small green pulley.
The contra-weight is fixed to the red cable.

I would like to hear what you think...suggestions and comments are welcome!
Thank you!

Link to download free 3D models
http://swifttopia.com/8CLN
http://swifttopia.com/8CNQ

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