Socket wrench

摘要

A socket wrench includes a handle including a pivotal head including a cylindrical, eccentric recess on a bottom, a cylindrical cavity in a blind end of the eccentric recess, a perimetric opening proximate to the eccentric recess, and a spring depressible detent; a socket drive including a lower projection, upper external ratchet teeth, an annular groove, and an intermediate flange; a hollow drive gear including a circular opening on a bottom, first, second and third posts, first, second and third positioning wells; first and second pawls; and a biasing member disposed and biased between the first pawl and the second pawl.

主权项

1. A socket wrench comprising:
an elongated handle comprising a pivotal head including a cylindrical, eccentric recess on a bottom, a cylindrical cavity in a blind end of the eccentric recess, a perimetric opening proximate to the eccentric recess, a spring depressible ball detent on an outer surface, and a through hole through the pivotal head and terminating at an inner surface of the cylindrical cavity; a socket drive comprising a lower projection, upper external ratchet teeth, an annular groove proximate to a top, and an annular flange separating the lower projection from the upper external ratchet teeth; a hollow drive gear comprising a circular opening on a bottom, a first post formed on the bottom, a second post formed on the bottom, a third post formed on the bottom, a first positioning well formed on an inner surface of the drive gear, a second positioning well formed on the inner surface of the drive gear, and a third positioning well formed on the inner surface of the drive gear wherein the drive gear is put on a lower portion of the pivotal head with the bottom of the pivotal head engaging the bottom of the drive gear; the socket drive is inserted through the circular opening with the flange engaging an underside of the socket drive and the external ratchet teeth passing the eccentric recess to partially dispose in the cylindrical cavity; and the first and second posts are disposed in the eccentric recess and the third post is disposed in the perimetric opening; a pin inserted through the through hole and a portion of the annular groove to retain the external ratchet teeth and allow the external ratchet teeth to turn; a first pawl disposed on the bottom of the drive gear and comprising pawl teeth on an inner surface and an inclined end wherein the first pawl has an outer surface moveably engaging the inner surface of the drive gear; a second pawl disposed on the bottom of the drive gear and, as a mirror image of the first pawl, comprising pawl teeth on an inner surface and an inclined end wherein the second pawl has an outer surface moveably engaging the inner surface of the drive gear; and spring means disposed and biased between the first pawl and the second pawl; wherein in an inoperative state, the pawl teeth of the first and second pawls are not in contact with the external ratchet teeth, the spring depressible ball detent is partially retained in the second positioning well, the third post is disposed in a central portion of the perimetric opening, the inclined end of the first pawl is spaced apart from the first post, and the inclined end of the second pawl is spaced apart from the second post; wherein in response to counterclockwise turning the drive gear until being stopped the spring depressible ball detent moves from the second positioning well to the first positioning well, the third post is proximate to one end of the perimetric opening, and the second post riding along the inclined end of the second pawl to cause the pawl teeth of the first pawl to engage the external ratchet teeth and disengage the pawl teeth of the second pawl from the external ratchet teeth respectively such that the handle is allowed to clockwise turn in order to clockwise turn the socket drive, and a next counterclockwise turn of the handle does not turn the socket drive but allows the handle to be re-positioned for another turn; and wherein in response to clockwise turning the drive gear until being stopped the spring depressible ball detent moves from the first positioning well to the third positioning well, the third post is proximate to an other end of the perimetric opening, and the first post riding along the inclined end of the first pawl to cause the pawl teeth of the second pawl to engage the external ratchet teeth and disengage the pawl teeth of the first pawl from the external ratchet teeth respectively such that the handle is allowed to counterclockwise turn in order to counterclockwise turn the socket drive, and a next clockwise turn of the handle does not turn the socket drive but allows the handle to be re-positioned for another turn.