B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
214/20, 212/28.5
B66C 23/70 (2006.01)
Patent
CA 1185212
ABSTRACT OF THE DISCLOSURE A telescopic boom which includes at least two sections and a manual section is disclosed with said sections being extended and retracted by a single hydraulic ram having its piston rod connected to one section. First coupling means are provided to selectively connect or release one end of the ram's cylinder case from the second boom section while a second coupling means is provided to operatively connect or release the other end of the cylinder case to the manual section. The first coupling means includes crank means for easily coupling and un- coupling the cylinder case and second section. The second coupling means includes a retrieval pin movable into position for connecting the cylinder case to the manual section when retracting the manual section within the second section, and releasable lock means axe provided to lock the manual section in extended position. The method of operating the boom during extension and re- traction of the manual includes the step of pivoting the boom to a near vertical position prior to extending the manual section relative to the second section thus obviating the need to lock the second section to the first section during this operation.
397118
Cox James W. Jr.
Evans John D.
Goode Frederick R.
Fetherstonhaugh & Co.
Fmc Corporation
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