Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1997-09-05
1998-11-24
Bidwell, James R.
Conveyors: power-driven
Conveyor section
Endless conveyor
24 35, B65G 1700
Patent
active
058395717
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention concerns a junction device for conveyor bands or for belts, generally H-shaped, which can transmit very high tensile stresses from one end of the conveyor to the other band on which it is mounted, while bearing without wear or damage, the passage on driving rollers, idle or stretches rollers used for moving the conveyor band, as well as the setting into trough of the conveyor band over its working path. In the following description, the term conveyor band will include the meaning of belt for an easy wording of the description.
2. Prior Art
In the preceding patent applications, the Applicant of the present application has disclosed junction device for conveyor bands, generally H-shaped, comprising a central part, corresponding to the H bar of the profile and two pairs of wings arranged on each side of the said central part, each one presenting a spacing such as the respective end of a conveyor band can be engaged therein, by bringing it approximately in abutment against the central part and to fix it to the said wings. The junction devices proposed were made of a flexible and elastic material in which was embedded a reinforcement, longitudinally extensible (the longitudinal direction being conventionally and for the convenience and clarity of the presentation of the whole of the present description and of the claims the longitudinal direction of the conveyor band, and applied also to the junction device, considered, in the way it has to be mounted on the conveyor band). The transversal direction is the direction perpendicular to the longitudinal direction as defined hereabove, whatever may be the dimensions of the junction device considered separately. This extensibility of the reinforcements of this type of junction devices in the longitudinal direction is aimed to enable the junction devices mounted on the conveyor bands, to step over repeatedly, without excessive wear or stress, entailing a quick alteration, the curved part or the conveyor bands paths, i.e. while these latter are passing round the driving rollers, the idle rollers and the stretching rollers. In fact, during this operation the upper part of the junction devices is submitted to tensile stresses while their lower part (i.e. the one directed towards the external surface of the rollers) is submitted to compression stresses, this resulting from the path difference of these parts, these paths being directly proportional to the curvature radius, which varies owing to the thickness of the junction devices. In the junction devices, object of the preceding applications, the applicant has proposed several means for achieving this extensibility of the reinforcements, woven fabrics with differential stretching of the warp with respect to the weft, knitted fabrics, metallic cables or synthetic resin cables of a high breaking strength and a low extensibility, but arranged according to a sinuous or a zigzag pattern. Since a limit must be fixed for the extensibility, in order to ensure the transmission of the tensile stresses which causes the movement of the conveyor band, this limit is obtained, in the case of fabrics by stretching the threads with a differential stretching of the warp with respect to the weft, in the case of knitted fabrics by stretching the warp threads inserted loose in the knitted fabric during the knitting operation, and in the case of inextensible cables or inherently insufficiently extensible cables, these latter tend to straighten in order to adopt a more rectilinear shape.
The reinforcements proposed previously have proven reliable in numerous applications. However, certain applications require the capacity of transmitting very high tensile stresses, while the extension capacity of the reinforcements must remain unaltered, the conditions of passage over the rollers remaining the same, as well as those related to the setting in trough. For these applications, the solutions previously proposed were not able to comply with this specific problem c
REFERENCES:
patent: 5573470 (1996-11-01), Jakob
ASER
Bidwell James R.
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