Patent ID: 8763991
Filing Date: 2014-07-01
Classification: B23P,B25B

Abstract:
1. A liftable puller device, comprising: a holder including a first holding portion and a second holding portion; a puller assembly which is located on the holder and includes a main body, a plurality of grippers hinged on the main body, a first hydraulic power system and a second hydraulic power system that are coaxially coupled with the main body, a plurality of telescopic members hinged on the plurality of grippers and the first hydraulic power system, and a push rod connecting to the second hydraulic power system; the first hydraulic power system being axially movable to drive the grippers to stretch or retract via the plurality of telescopic members, the second hydraulic power system driving the push rod to move axially; a first frame which is coupled with the main body and the first holding portion and includes a plurality of first retaining zones run through by the telescopic members, the plurality of first retaining zones including a first main retaining zone, two first sub retaining zones and a first auxiliary retaining zone; the first main retaining zone being located on a top end of the first frame, the two first sub retaining zones being relative to the first main retaining zone, the first auxiliary retaining zone being located between the first main retaining zone and one of the two first sub retaining zones; and a second frame which is connected to the main body and the second holding portion and formed at a diameter greater than that of the first frame and includes a plurality of second retaining zones run through by the grippers, the plurality of second retaining zones including a second main retaining zone, two second sub retaining zones and a second auxiliary retaining zone corresponding to the first retaining zones.