| 摘要 |
FIELD: hydraulic hoists, telescopic hydraulic hoists in particular. ^ SUBSTANCE: base member of hoist has recess receiving the intermediate and inner tubular steps when hoist is in fully assembled position; locking collar on gland sleeve bearings overlaps extended end of wider tubular step defining the limit of retraction for each intermediate tubular step so that when tubular step is completely retracted it gets in contact with end of next wider step without use of locking rings. ^ EFFECT: enhanced stability and rigidity at maximum length of hoist; increased service life; facilitated assembly; low cost of components. ^ 17 cl, 10 dwg |
