| 摘要 |
For use with a pulling post of the type used for applying tension via a chain to a damaged automobile, a base having retractable rollers is formed of two V-shape sections pivoted together at their apexes. One of the sections has a post socket. The sections are spring biased to pivot relative to one another and normally form an angle. When tension is applied via the chain, the base sections pivot contra to the spring bias and flatten out against the floor. Thus, all slack is removed from the chain before strong pulling force is applied.
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