B - Operations – Transporting – 66 – F
Patent
B - Operations, Transporting
66
F
214/38
B66F 9/22 (2006.01) B66F 9/065 (2006.01)
Patent
CA 1252426
ABSTRACT OF THE DISCLOSURE A method of operating a boom which comprises an elongate member mounted on a base for pivotal movement about a first axis transverse to the axis of the elongate member, first fluid operated power means mounted between the base and the elongate member to control raising and lowering of the member about said first axis, an implement mounted at one end of the member for pivotal movement about a second axis transverse to the axis of the elongate member, second fluid operated power means comprising a double acting ram having a cylinder and plunger slidable therein, mounted between the implement and the member to control movement of the implement about the second axis, means to feed fluid under pressure to and from the first fluid operated power means along first feed lines via a first operating valve, means to feed fluid under pressure to and from the second fluid operated power means along second feed lines via a second operating valve, a displacement means comprising a further double acting fluid operated ram connected between the member and the base to sense movement of the member about the first axis, fluid lines from the displacement means to the second fluid operated power means to transmit a signal to the second fluid operated power means to cause the second fluid operated power means to operate to maintain the orientation of the implement relative to the base as the implement is raised and lowered on the member, the method including the steps of providing fluid under pressure to the displacement means during raising of said one end of the elongate member, whereby said displacement means contributes to the raising of said one end of the meber so that the design limit of the boom can be raised without having to increase the lifting capacity of the first fluid operated power means, whilst the orientation of the implement relative to the base can be maintained level during raising and lowering.
488860
Bamford(j.c.) Excavators Limited
Ridout & Maybee Llp
LandOfFree
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