| 摘要 |
The trolley chassis (1) is formed by runners (1a) and traverses (1b) and supported by wheel carrying legs (4) which can fold and have lock assemblies. Each lock has a combination of a strong oblique strut (7) articulated by one of its ends to mountings (4b) of the corresponding leg. The lock also has a horizontal arm (9) fixed at one end to the upper part of the leg. The free ends of the strut and arm are coupled by a cross bar (8) which slides following the axis of the chassis. The blocking of the bar is accomplished by a lock bolt (12) on the chassis.
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