Lifting means for goods

US4413853A · kind A · utility

Inventor

• Sten Andersson · Hagfors, SE

Key dates

• Filing date: Sep 16, 1981
• Grant date: Nov 8, 1983
• Expiry date: Sep 16, 2001

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B66C1/0293
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A lifting device comprising a tube (A) sealed at both ends or a pipe similarly closed at both ends. Both tube (A) and pipe are compressible in the axial direction. By regulating the vacuum in the space defined by the tube (A) or pipe, the length of the tube or pipe can be regulated, thus raising or lowering goods connected to the tube (A) or pipe. An arrangement is provided to permit rotation of the tube in relation to its support, and to act as a vacuum check valve.