The lifting spindles (3) and spindle nuts (4) are provided with a round thread, said spindle nuts (4) being nylon threaded nuts (4).

A greater degree of axial mobility may be provided, for example by a rotating lift screw (172).

Elimination of elevating screws (source of non-recoverable deflection)

Lifting screws and levels allow further installation of the level or theodolite.

The assembly of the orifice plate is completed with jacking screws to ensure an easy removal.

The device has a screw lift with telescopic structure with a drive unit (37) fixed at the lower end of the casing pipe (7).

This extractor removes the sleeves and includes three main components - a collet or sleeve engaging member, a mounting bracket, and a lift screw.

To perform the verification, it is necessary to use lifting screws that reduce bubbles to zero point.

Next, the telescope should be placed in a position that is parallel to the line of the two lifting screws.

The jacking assembly (60) comprises a jacking plate (61) and a bone screw (62).

special triple lift jack screw hand lifting

The lifting apparatus includes a jacking device (15) which may be an electronically controlled screw jack (30), a lifting bar (20) and a plurality of lifting fixtures (25).

The lifting device includes a screw lifting mechanism, a combination gear mechanism, a rack gear mechanism, a hydraulic lifting mechanism and an air cylinder lifting mechanism.

The lifting spindles (3) and spindle nuts (4) are provided with a round thread, said spindle nuts (4) being nylon threaded nuts (4).

Fish lifting devices using the principle of the Archimedes' screw are known.