Mobile working platform

US4624340A · kind A · utility

Assignee

• AB Sjolanders Smides & Mek. Verkstad · SE

Inventors

• Jan Astrom · Osby, SE
• Gunnar Eriksson · Sollefteå, SE

Key dates

• Filing date: Nov 5, 1985
• Grant date: Nov 25, 1986
• Expiry date: Nov 5, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66F11/044
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A mobile working platform, particularly a so-called under-bridge lift, comprising a parallelogram type boom which is horizontally and vertically pivoted to a vehicle and which at its end facing away from the vehicle has a turntable which is rotatable by means of a hydraulic motor and at its circumference supports the angular end of an inner arm which is vertically pivotable by means of a piston and cylinder assembly which is mounted adjacent to the circumference of the turntable approximately diametrically opposite the mounting point of the inner arm. By means of a hydraulic cylinder, the inner arm is vertically pivoted to an intermediate arm which by means of a further hydraulic cylinder is vertically pivoted to an outer arm which vertically pivotally supports a platform or cage. Between the turntable and the platform or cage, motion transfer means in the form of rods and chains extend to keep the platform or cage in a horizontal position independently of the angle of inclination of the boom and arms.