It is required to design a helical torsion spring for a window-Shade. The spring is made of patented and Cold-drawn steel wire of Groede 4. The yield strength of the material is Gol. of the ultimate...

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Extracted text: It is required to design a helical torsion spring for a window-Shade. The spring is made of patented and Cold-drawn steel wire of Groede 4. The yield strength of the material is Gol. of the ultimate tensile strength,and from the factor of Safety is 2. Cansiderations, the space mean coil diameter is kept as 18 mm. The maximum be- nding moment acting modulny uf elas ticity of the kNlmm?). The stiffness of the on the spring is 250 N-mm. The moterial is (207 should be(3 Nmm/ spring spring rad). Determine the wire diameter and the number of active Gils. Also, deteromine the deflectinon.and.stered staincuerg-