| 摘要 |
The gate of a truck is mounted on two parallelogram linkages and raised and lowered by means of an electromotor in circuit with the truck battery, two drums driven by the motor through a spur gear transmission, and a cable or chain wound on each drum and secured to an associated linkage. The gate can be swung between upright and horizontal positions on the linkage, and is spring-biased toward the closed position so that the spring cushions the gate-opening movement.
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