Patent · US Expired

Extendable crane with folding conduit

US3942554A · kind A · utility

19Cited by
7References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 19, 1974
Grant dateMar 9, 1976
Priority date
Expiry dateApr 19, 1994

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T137/8807
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

Abstract

It is known to construct various types of cranes such as swing-boom cranes employing extendable boom sections and hammerhead cranes with rotating, counter-balanced, cantilevered booms so that conduits extend between and are connected to parts of such cranes which are movable. Such structures may be improved by using as the conduit a plurality of rigid conduit sections connected together by rotary joints permitting said conduit sections to be rotated about parallel axes. Certain of these joints are located where the conduit is connected to parts of the crane. A rotary joint is also located between each adjacent connection of the conduit to the crane. The sections are dimensioned so that during operation of the crane the rigid sections cannot be moved so as to be aligned with one another. As a consequence of this the various portions of the conduit will fold in a desirable manner as the crane is operated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.