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Unformatted text preview: 3. 5.1 Closing Mechanism One common design for automatic door closing purpose is using motors to bring back the door. However, in this project, a motor is rather complicated and less cost effective since the calculation tension force, angle and length of motors pulling string must be precise. Also, the technical requirement, electric requirement, set up and fabrication of motor is rather difficult. As a result, springs which naturally go back to its original state is chose to bring back the opening door to its closing state. The orientation of the spring set up is either vertically through the connection between door and door frame ( see figure 7-N ) or point connection between door and frame. Due to the time limit and fabrication difficulty, latter design is chose as the pulling force can be easily increased or decreased by adding or deleting springs ( see figure 9-L, 8 )....
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- Fall '10