Mechanism Design Analysis and Synthesis Volume 1 13 Figure P

Mechanism Design Analysis and Synthesis Volume 1

1.3. Figure P1.2 shows a tool used for shearing. A spring (two spring steel leafs) be- tween the two handles keeps the cutting surfaces a and allows the to be used ily in one hand. Disregarding the spring connection and considering the straight handle on the right as the grounded link, (a) What task does this mechanism perform? (b) Sketch the kinematic diagram of this mechanism. (c) What mechanism is this? Figure P1.2 (Courtesy of AESCULAP) 1.4. A dump truck mechanism is depicted in Fig. P1.3. (a) hat type of a six-bar mechanism is this? (b) What task does it satisfy?

Solution

Answers for

1.6

i) Its 4-bar linkage.

ii) Locking pliers used to hold piece together at toggle position of mechanicm.

iii) Opening of the jaws at a toggle position can be adjusted by the screw. As the adjusting screw moves the fixed pivot of 4 bar mechancis is change and along with it opening position of jaws also changed.

1.11

1.This is double wishbone type of suspension system. This is functionn generator mechanism.

2. This linkage is used in this application to minimized the transfer of ground excitation to the vehicle chasis, to have a better ride characteristics for the passengers.

3. If the dimensions of the linkages are changed for this system, it may affect the ride characteristics in either way better or worse. The upper link 2 in this suspension is kept small in length as compare to lower link.

4. The change in length of link 2 & 4 would affect the wheel camber angle. Also the orientation of link 2 & 3 are responsible for roll center hieght. Lower the roll center results in better roll stability.

1.4

a) Its motion generator 6 bar mechanism.

b) This linkage assure that the laad is tilted with parabolic curvature. The truck shouls start unloading slow & pick up the pace as it unloads.

1.3

a) Its tooth extractor.

c) Its a function generator mechanism.