| 摘要 |
A reversible ratchet wrench includes a head including a through opening, a cavity on an inner surface of the through opening, and an open well on an inner surface of the cavity; a drive gear including external drive teeth and rotatably supported in the through opening; first and second reversing pawls each including pawl teeth and a detent notch wherein the detent notches communicates with each other, the pawl teeth of the second reversing pawl engage the drive teeth, and the first and second reversing pawls are in the cavity; a reversing lever including an exposed thumb tab, a recess on an inner surface, and a slit communicating with the recess; and a biasing member including first and second ends urging against the detent notches. The biasing member is anchored in the slit and urges against the well. |
| 主权项 |
1. A reversible ratchet wrench comprising:
a handle; a head formed with the handle and including a through opening, an annular trough disposed on an inner surface of the through opening adjacent to a top thereof, a cavity disposed on an inner surface of the through opening, and an open well disposed on an inner surface of the cavity; a drive gear including an annular groove adjacent to a top thereof, external drive teeth disposed on an outer surface, and a split ring disposed in both the annular groove and the annular trough to hold the drive gear in place so that the drive gear is rotatably supported in the through opening; a first reversing pawl including pawl teeth disposed on a first surface and a detent notch disposed on an opposite second surface; a second reversing pawl engaged a bottom of the first reversing pawl and including pawl teeth disposed on a first surface and a detent notch disposed on an opposite second surface wherein the detent notch of the first reversing pawl communicates with the detent notch of the second reversing pawl, the pawl teeth of the second reversing pawl engage the drive teeth, and the first and second reversing pawls are disposed in the cavity; a reversing lever including a body disposed in the well, an exposed thumb tab, a recess disposed on a surface of the body, and a slit disposed in the body and communicating with the recess; and a biasing member including a first end urging against the detent notch of the first reversing pawl and a second end urging against the detent notch of the second reversing pawl wherein the biasing member is anchored in the slit and urging against an inner surface of the well; wherein a clockwise rotation of the thumb tab counterclockwise moves both the first and second reversing pawls and the drive gear is capable of counterclockwise moving only; and wherein a counterclockwise rotation of the thumb tab clockwise moves both the first and second reversing pawls and the drive gear is capable of clockwise moving only. |
