Material or article handling – Vertically swinging load support – With rectilinear translation
Patent
1994-07-14
1996-02-27
Underwood, Donald W.
Material or article handling
Vertically swinging load support
With rectilinear translation
212349, 52115, B66F 9065
Patent
active
054943973
DESCRIPTION:
BRIEF SUMMARY
This invention relates to load handling apparatus comprising a telescopic boom carrying a hydraulic unit for manipulating a load receiving device.
Such apparatus is already known in which the telescopic boom has three sections. The first section carries the hydraulic unit and is adapted to carry the load receiving device; a hydraulic ram acts between the second and third sections; synchronising means extend and retract the First section in synchronism with the second section; and the third section is tiltably mounted on a vehicle.
Using a fork as the load receiving device it is possible to unload containers up to 9 m long, by inserting the boom through one end of the container. However, longer containers (e.g. 12 m) raise the problem of achieving a telescopic boom which has a sufficiently long telescoping range. Increasing the length of the sections increases the retracted length of the boom. However, increasing the number of sections raises the problem of supplying hydraulic fluid to the hydraulic unit along the widely variable length of the telescopic boom.
In one aspect of the present invention, a load handling apparatus includes a telescopic boom having first, second, third, and fourth telescopically interengaged sections. A first hydraulic ram is connected to the second and third sections and is operable to move the second section between a fully retracted position and a fully extended position. The apparatus further includes a synchronizing means for moving the first section between a fully retracted position and a fully extended position relative to the second section in response to the movement of the second section relative to the third section. A second hydraulic ram is connected to the third and fourth sections and is operable to move the third section relative to the fourth section. A plurality of rolling hoses for communicating hydraulic fluid move with the telescopic sections.
The invention will be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a side elevation of a vehicle equipped with load handling apparatus including a telescopic boom carrying a hydraulic unit for manipulating a load receiving device;
FIG. 2 is a diagram showing means for extending and retracting the boom;
FIG. 3 is a diagram showing means for supplying hydraulic fluid to the hydraulic unit for manipulating the load receiving device;
FIG. 4 is a diagram showing means for supplying hydraulic fluid to a ram for extending part of the boom;
FIG. 5 is a diagrammatic side view of the boom in a partly extended state;
FIG. 6 is a diagrammatic side view of the boom in a fully extended state;
FIG. 7 is a diagrammatic side elevation of the vehicle, showing various possible positions of the boom; and
FIGS. 8 to 11 show parts of a preferred embodiment of the telescopic boom, in vertical cross-section, with certain items omitted for the sake of clarity.
The vehicle 10 illustrated in FIG. 1 has a telescopic boom 11 which is tiltably mounted on a chassis frame 12 and can be raised and lowered about a pivot 13 by means of a hydraulic ram (not shown) connected between the boom 11 and the frame 12. At the front end the boom 11 has a bracket 14 adapted to carry a load receiving device 16 which includes a fork 17 and which is tiltable about a pivot 18. The front end of the boom 11 also carries a hydraulic unit 19 including a ram 21, for manipulating the load receiving device 16. In FIG. 1 the vehicle 10 is shown in its travelling position, with the boom 11 fully retracted and stowed in its lowest tilting position, the load receiving device 16 being tilted to a median position, and the fork 17 being raised and folded backwards from its normal operating position on the load receiving device 16.
In FIG. 1 the manipulating ram 21 projects from the boom 11 and is pivoted to a lug 22 on the load receiving device 16. FIGS. 10 and 11 show an alternative arrangement in which the ram 21 is housed in the boom 11 and is connected by a lever 23 and a link 24 to a lug 26 on the load receiving device 16.
The l
REFERENCES:
patent: Re30905 (1982-04-01), Lester
patent: 3804262 (1974-04-01), Wiencek et al.
patent: 4255076 (1981-03-01), Svenning
patent: 4289442 (1981-09-01), Stevens
patent: 4506480 (1985-03-01), Murrill et al.
Caterpillar Inc.
Underwood Donald W.
White Claude F.
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