Elevator – industrial lift truck – or stationary lift for vehicle – Industrial lift truck or required component thereof – Having structure allowing propulsion or steering by walking...
Patent
1997-11-19
1999-07-06
Terrell, William E.
Elevator, industrial lift truck, or stationary lift for vehicle
Industrial lift truck or required component thereof
Having structure allowing propulsion or steering by walking...
187222, 187234, B66F 906
Patent
active
059187034
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a low-lifting industrial truck comprising on one hand a driving unit having two wheels, and on the other hand at least one jib protruding from a front thereof, said jib being, at a rear end, attached to an upright frame, which is vertically movable in relation to the driving unit by means of at least one hydraulic cylinder, the jib having a rolling device in the vicinity of its frontal free end, in connection with which there are means for raising and lowering the jib relative to the rolling device.
Generally, the purpose of low-lifting industrial trucks is to lift above all heavy loading objects only a short distance above the ground of the industrial truck and to transport the lifting object limited distances along the ground; most commonly in factory and warehouse premises.
PRIOR ART
A low-lifting industrial truck of the kind initially referred to is known by DE 4310257. This known construction comprises two parallel jibs which are connected to a vertical frame which is guided by vertical guides in the driving unit. The rolling devices at the free end portions of the jibs are raised and lowered by means of swinging mechanisms which are affected by rods, which rods have, at the rear ends thereof, rolls abutting against the bottom part of the driving unit. When the frame is raised relative to the driving unit, the rods and the swinging mechanisms guarantee a simultaneous lowering of the rolling devices in relation to the jibs so that the jibs are raised along their entire length more or less in parallel to the ground. The driving unit in this known construction comprises two wheels, one of which is drivable and steerable while the other one consists of a simple support wheel. The two wheels are mounted, in the main, vertically immovable in relation to the driving unit. This means that the known industrial truck requires, in all essentials, completely plane ground surfaces to be able to be impeccably driven. Namely, if anyone of the four rolling elements carrying the industrial truck, viz. the two wheels and the two rolling devices at the free ends of the jibs, is driven over a hollow, an elevation or another unevenness of the ground, the industrial truck in its entirety will sway at the same time as considerable breaking stress may arise in connection with the guides between the frame and the driving unit. Therefore, a reliable transport of, in particular, heavy loading objects on uneven ground surfaces is not possible with the industrial truck disclosed in DE 4310257.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at removing the above-mentioned disadvantage of the known industrial truck and at creating an improved industrial truck. Thus, a primary object of the invention is to create an industrial truck which may be driven on uneven ground surfaces without causing marked sways and without causing annoying strains in the construction.
According to the invention the above-mentioned object is attained by the features defined in the characterizing clause of claim 1. Preferred embodiments of the invention are furthermore defined in the dependent claims.
BRIEF DESCRIPTION OF THE APPENDED DRAWINGS
In the drawings:
FIG. 1 is a schematic side view of a low-lifting industrial truck according to the invention,
FIG. 2 is a schematic planar view from above of said industrial truck,
FIG. 3 a partial, enlarged side view showing the frame and the jibs of the industrial truck in a lower, inactive lifting position,
FIG. 4 is a similar side view showing the frame and the jibs in an upper, active lifting position,
FIG. 5 is a rear end view seen from the left in FIG. 3, illustrating vital components included in the driving unit of the industrial truck,
FIG. 6 is an exploded view showing a cross bar included in the driving unit together with two appurtenant side pieces,
FIG. 7 is a schematic longitudinal section showing a jib in an inactive position,
FIG. 8 is a corresponding longitudinal section showing the same jib in an active position,
REFERENCES:
patent: 3170706 (1965-02-01), Nichols
patent: 3202233 (1965-08-01), Dolphin et al.
patent: 5354080 (1994-10-01), Jones
patent: 5722511 (1998-03-01), Wakamiya
patent: 5752584 (1998-05-01), Magoto et al.
Crawford Gene O
Terrell William E.
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