MOTORIZED LOW-PROFILE LIFTING APPARATUS

摘要

MOTORIZED LOW-PROFILE LIFTING APPARATUS A low-profile motorized lifting apparatus (10) for hoisting and moving objects along an I-beam (12). First and second drive rollers (48 and 49) are operatively connected to one another and mounted to the frame assemble (20) on opposite sides of the beam web (14) to support and smoothly drive the frame assembly (20) over seams and irregularities in the lower flange (16). A block assembly (80) is suspended beneath the frame assembly (20) by a load chain (94) passing through two pulley wheels (86) rotatably mounted on the block (82) to rotate about an axis parallel to the longitudinal axis of the I-beam (12) to stabilize the block and permit raising of the block assembly (80) to a maximum vertical height. C-shaped guide plates (26) and rotatable guide rollers (28) restrict vertical and lateral movement of the frame assembly (20) on the I-beam (12).