See my reference entry for a picture.

Adding internal barrel rollers to the bottom of the chain will reduce chain pull.
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd...

FAG 20234MB BARREL ROLLER BEARINGS
http://www.mrosupply.com/bearings/2171989_20234mb_fag-bearin...

Run a Google image search with omniwheel + conveyor

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Note added at 6 hrs (2022-06-28 23:35:18 GMT)
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Note added at 6 hrs (2022-06-28 23:37:40 GMT)
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An Australian supplier uses the term 'universal roller conveyor' (one of two types of 'multi-directional conveyor'), the rollers of which are made up of a number of 'barrel rollers'. IOW, the 'universal roller' itself is not a 'barrel roller'. Plenty of pictures

UNIVERSAL ROLLER CONVEYORS: AN EXTRAORDINARY PRODUCT
The unique product design of the UNIVERSAL ROLLER allows for straight-line movement in a normal transport operation, with the added benefit of allowing an operator to move the product in any desired direction.
They are useful in situations where a load may need to be rotated at a work station in an assembly line or where the item needs to be moved from one line to another during the assembly process. They are also well suited for switch points or where a change of direction is required.

Designed using stainless steel pins with a polymer body and BARREL ROLLERS it is suited to wet environments where wash down is required.

UNIQUE SPHERICAL BARRELS IN POM (ACETAL) OR PU (POLYURETHANE)
https://adeptconveyor.com.au/multi-directional-conveyors/1:2...