Roller or ball bearings - are of elastomeric material with intermediate smaller harder roller or ball to eliminate play

摘要: A roller or ball bearing has two parts moving relative to each other, with a seating for rollers/balls between them, either both the rollers and/or seatings being in elastic material. The balls are of material so as accommodate any inaccuracy intermediate space and prevent play outer inner sections. suitable is fluorine elastomer polyurethane. bearings eliminate play, low cost, take heavy loads, provide quiet movement, unaffected by dust dirt, require no lubricant can be used outdoors. They e.g. telescopic supports drawing boards.