Subtopic: Three point hitches – free link and restrained link operations
Question Statement:
In restrained link operation of three point hitches, the line of pull passes
Options:
(A) through the virtual hitch point and bending force exists on lower links
(B) above the virtual hitch point and bending force exists on lower links
(C) below the virtual hitch point and no bending force exists on lower links
(D) through the virtual hitch point and tensile force exists on lower links
Official Answer Key:
B
Step-by-Step Solution & Explanation
In the restrained (fixed) link mode the top link is not free to pivot, so the effective (virtual) hitch point shifts and the actual line of draft passes above the geometric virtual hitch point, inducing a bending moment (not pure tension) in the lower links → option (B). In free-link (option C-type) operation the line of pull passes through the virtual hitch point with the links in pure tension/compression and no bending.
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