A clipboard that is used for holding and writing on paper is hown. The clamp ABC
ID: 1828930 • Letter: A
Question
A clipboard that is used for holding and writing on paper is hown. The clamp ABC has a torsional spring at pin C with stiffness k=2in*lb/rad. To release the clamp so that the paper may be inserted/removed, the user applies a vertical force P. Determine the pretwist of the torsional spring (in terms of # of turns) so that the clamp provides a clamping force of 6lb at point A when P=0, and determine the force P needed to release the clamp. Assume the contact at A is frictionless.
A clipboard that is used for holding and writing on paper is hown. The clamp ABC has a torsional spring at pin C with stiffness k=2in*lb/rad. To release the clamp so that the paper may be inserted/removed, the user applies a vertical force P. Determine the pretwist of the torsional spring (in terms of # of turns) so that the clamp provides a clamping force of 6lb at point A when P=0, and determine the force P needed to release the clamp. Assume the contact at A is frictionless.Explanation / Answer
first one is use F1*L1=F2*l2, f1=6 l1=2.1 f2=0.8
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