Roller drive assembly
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United States of America Patent
Stats
-
Oct 4, 1994
Grant Date -
N/A
app pub date -
Jul 27, 1993
filing date -
Jul 27, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A roller drive assembly comprises a drive roller mounted in a frame in such a way that the roller can be pivoted by a drive such as an electric motor from a lower retracted position when the drive roller is stationary to one of two, upper operating positions when the drive roller is rotating, dependent on the direction in which the roller is pivoted. An outer shell forming part of the drive roller for engaging an object to be conveyed defines a first larger-area frictional surface projecting above which is a plurality of second smaller-area frictional surfaces. These second frictional surfaces are are disposed in such a way that when the drive roller is pivoted from its retracted position into one of its operating positions, an object to be conveyed by the assembly is first contacted by the second frictional surfaces which, as the drive roller moves further into its operating position and thereby presses with greater force against the conveyed object, are displaced until they lie flush with said first frictional surface which can then make contact with said object to be conveyed.
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