Patent ID: 8720309
Filing Date: 2014-05-13
Classification: B25B

Abstract:
1. A ratchet wrench comprising a body, a D-head, a loose ratchet, a substantially heart-shaped spring, a disc and a ring; the body having a head portion at one end thereof the head portion having a through hole opened thereon, a plurality of teeth uniformly defined on an inner wall of the through hole; the D-head rotatably disposed in the through hole, the D-head having a connecting member formed at one end thereof, a ball assembled on a lateral side of the connecting member, the ball partially exposed from the connecting member; a threaded member assembled to another end of the D-head; the loose ratchet disposed on a lateral side of the D-head, the loose ratchet having a pinhole opened at a top end thereof; the substantially heart-shaped spring having at least one extension leg defined at one end thereof, the extension leg inserted into the pinhole of the loose ratchet, the substantially heart-shaped spring having a closed tip defined at another end thereof; the disc disposed on a top of the head portion, a shouldered hole opened at a center of the disc, the shouldered hole having a first, concentric aperture and a second, eccentric aperture opened at the bottom thereof, a shift pin defined at the bottom of the disc and abutting against an inner side of the closed tip of the substantially heart-shaped spring, the first aperture and the second aperture communicating with each other to form a long groove, a ring disposed onto the shouldered hole for connecting to the threaded member; and the ring disposed onto the shouldered hole of the disc for connecting to the threaded member; wherein, when a user rotates the body in one direction, the D-head rotates with the rotation of the head portion because the loose ratchet is engaged with the teeth of the head portion; in contrast, when the user rotates the body in another direction, the D-head does not rotate with the rotation of the head portion because the loose ratchet is disengaged with the teeth of the head portion step by step by the compression of the substantially heart-shaped spring.