Patent ID: 6345559
Filing Date: 2002-02-12
Classification: B25B

Abstract:
A ratchet wrench having a labor saving structure, comprising:a drive shank having a front end provided with a fixed plate, said fixed plate having a center defining a first circular hole and having two sides each defining a rivet hole located beside said first circular hole; a drive arm pivotally mounted on said fixed plate and having a center defining a second circular hole and having two sides each defining an elongated arcuate hole located beside said second circular hole and aligning with said rivet hole of said fixed plate; a drive head mounted in said first circular hole of said fixed plate and said second circular hole of said drive arm; two rivets each extending through said elongated arcuate slot of said drive arm and each secured in said rivet hole of said fixed plate; and two C-shaped snap rings each respectively mounted on said drive head for snapping and securing said fixed plate, said drive arm and said drive head together; wherein, when said drive shank is driven to rotate, each of said rivets can push said drive arm along said elongated arcuate slot, thereby forming a deflective leverage labor saving effect.