Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1981-09-16
1983-11-08
Cherry, Johnny D.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
414627, B66C 102
Patent
active
044138539
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lifting means for goods. The invention is particularly directed to the movement of goods in vertical and horizontal directions where the difference in vertical direction is moderate. Hitherto lifting tables and motors with winches and lifting hooks have been utilized. A lifting means of the type just mentioned can be arranged in the form of a telpher movable along a rail arranged in the ceiling of factory premises. Lifting tables are practical but are unable to grip hold of goods. Motors and winches also function satisfactorily but a moving cable on ground level may cause damage to persons, which is a drawback. Obviously damage to persons can be avoided by due care. However, the human factor unfortunately cannot be disregarded.
The present invention relates to a lifting means which is simple and designed so as not to cause damage to persons in the vicinity when operating on ground level. This is achieved according to the invention by using an elongate tubular container which is closed at both ends, one end being attached to an anchoring point which may be fixed or movable and the other end of the container being brought into communication with goods to be moved. The connection may be direct or indirect. The tubular wall of the container can be extended or shortened in the axial direction, thus providing movement in the vertical direction. Extension or shortening is achieved by connecting the inside of the container to a vacuum-generating means which regulates the vacuum in the space defined by the tube.
The vacuum inside the container is regulated by means of control members preferably consisting of a valve arrangement controlling the pressure ratio between the inside of the container and its surroundings.
The valve arrangement may be designed to be opened in two steps, a smaller opening being exposed in the first step, so that the opening ratio is adjustable. In the second step the valve arrangement is fully opened.
According to a preferred embodiment of the present invention, the other end of the container is designed as a suction body so that the container can be applied to the goods to be moved via the suction body.
The other end of the container may also be designed in such a way that it is joined to a separate suction body which is in communication with the vacuum-generating means either directly or via the inside of the container.
The other end of the container may be shaped as or provided with a lifting hook.
The cylindrical wall of the container consists preferably of rubber, plastic or some other material which is compressible in axial direction, forming horizontal folds.
The wall of the tubular container may be reinforced in some way, such as by a spiral the axis of which coincides with the axis of the tubular container. The spiral may be of spring-steel so that it always strives to keep the tubular wall of the container maximally extended.
The tubular wall of the container may have sections along its longitudinal extension which are not compressible.
Further characteristics of the present invention are revealed in the following description.
The invention will be described more fully with reference to the accompanying drawings in which
FIG. 1 shows a lifting means according to the present invention,
FIG. 2 shows an enlargement of the lower part of the lifting means,
FIG. 3 shows an enlargement of the valve arrangement of the lifting means and
FIG. 4 shows an embodiment of the upper part of the lifting means.
In the drawings A is a lifting means comprising a tube-like unit 1 having a wall enabling the tube to be compressed in axial direction. The tube suitably consists of rubber, plastic or other similar material and is corrugated in order to facilitate compression. The tube is provided with reinforcement consisting of a spiral spring of spring-steel. The axis of the spiral coincides with the axis of the tubular unit. The tubular unit is sealed at the top end by a disc-shaped body 2 which, is joined by means of links or in some other way, to a telpher movable al
REFERENCES:
patent: 2557260 (1951-06-01), Clark
patent: 3318468 (1967-05-01), Olson
patent: 3743340 (1973-07-01), Williamann
patent: 4067359 (1978-01-01), Kwast
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