![]() ![]() The internal type of retaining ring is used to retain such as bearings or shafts within a bore. External retaining rings are removed or replaced by expanding their circumference by the operation of the circlip pliers tips engaged into the retaining ring engagement holes thereby expanding the retaining ring until its internal diameter is greater than the shaft diameter. The external type rings normally engage an annular groove formed in a shaft to inhibit axial movement of a bearing, pulley or gear mounted upon the shaft. ![]() These circlips or snap rings hereinafter termed “retaining rings” are supplied as internal or external. To enable installation or removal most snap rings are made with apertures hereinafter termed “engagement holes”, at the open ends by which a ring is engaged and then either expanded or contracted by the use of suitable snap ring pliers. The operating prongs can be either fixed or interchangeable. The snap ring engagement holes also differ in size and the operating prong ends are sized appropriately. As circlips are made in many different sizes, large and small circlip pliers are manufactured. The operating prongs can be straight or if required angled in order to conveniently work in confined spaces. Dependant upon the orientation of the levered end operating prongs the circlip either opens or closes as the snap ring plier handles are operated. The holes are for the engagement of the operating prongs of the snap ring pliers. Most circlips consist of an open ring of thin spring steel with a hole at the open ends of the ring. The handles pivoting around a fulcrum in order to lever the circlip via the levered end operating prongs in the required direction. The known types of snap ring pliers work in a similar fashion to scissors. The internal type reduces the circumference of the circlip the external type expanding the circlip circumference. There are two main types internal and external. This invention relates to circlip pliers or snap ring pliers which are well known for the removal or replacement of circlips (in the U.S.A referred to as “snap rings”) into their retaining grooves. ![]()
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