Design a toggle jack to lift a load of 5 kN. The jack is to be so designed that the distance between the centre lines of nuts varies from 50 to 220 mm. The eight links are symmetrical and 120 mm long. The link pins in the base are set 30 mm apart. The links, screw and pins are made from mild steel for which the stresses are 90 MPa in tension and 50 MPa in shear. The bearing pressure on the pin is 20 N/mm2. Assume the coefficient of friction between screw and nut as 0.15 and pitch of the square threaded screw as 6 mm.

Design a toggle jack to lift a load of 5 kN. The jack is to be so designed that the distance between the centre lines of nuts varies from 50 to 220 mm. The eight links are symmetrical and 120 mm long. The link pins in the base are set 30 mm apart. The links, screw and pins are made from mild steel for which the stresses are 90 MPa in tension and 50 MPa in shear. The bearing pressure on the pin is 20 N/mm2. Assume the coefficient of friction between screw and nut as 0.15 and pitch of the square threaded screw as 6 mm.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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15. Design a toggle jack to lift a load of 5 kN. The jack is to be so designed that the distance between the
centre lines of nuts varies from 50 to 220 mm. The eight links are symmetrical and 120 mm long. The
link pins in the base are set 30 mm apart. The links, screw and pins are made from mild steel for which
the stresses are 90 MPa in tension and 50 MPa in shear. The bearing pressure on the pin is 20 N/mm2.
Assume the coefficient of friction between screw and nut as 0.15 and pitch of the square threaded
screw as 6 mm.

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