Patent ID: 9687969
Date: 2017-06-27
CPC Classifications: B25B

Claim:
1. A wrench, comprising a working part and a handle, characterized in that, the working part comprises a main axle, a bidirectional pawl and a ratchet wheel, the main axle is perpendicular to the handle, and the bidirectional pawl and the ratchet wheel are mutually cooperated, wherein the ratchet wheel is arranged to be caused by the handle, the bidirectional pawl is arranged to cause the main axle to rotate and provides a first pawl and a second pawl which are opposite to the clutch direction between the ratchet wheel, and the working part further comprises a direction switching mechanism for setting the clutch direction of the bidirectional pawl and the ratchet wheel; the direction switching mechanism is arranged such that the first pawl and the second pawl are engaged with the ratchet wheel selectively, such that when the handle is rotated in the direction set by the direction switching mechanism, the ratchet wheel is engaged with the bidirectional pawl, then causes the main axle to rotate; when the handle is rotated in the direction opposite to the direction set by the direction switching mechanism, it slips between the ratchet wheel and the bidirectional pawl, and the main axle remains stationary; wherein the direction switching mechanism is a direction switching rod disposed through the main axle, the direction switching rod is equipped with a retractable bar cooperating with the bidirectional pawl, and a spring is provided inside the retractable bar, so that the retractable bar can retract in the radial direction of the direction switching rod, when the direction switching rod is rotated, the retractable bar is rotated subsequently, the head part thereof cooperates with a curved surface arranged on the bidirectional pawl under the bias of the spring, the first pawl or the second pawl of the bidirectional pawl cooperates with the ratchet wheel selectively, thereby the clutch direction between the bidirectional pawl and the ratchet wheel is set; the working part further comprises a planetary gear speed increasing mechanism acting on the main axle, and the planetary gear speed increasing mechanism comprises a sun gear, a planetary gear and a ring gear, wherein the sun gear is arranged to cause the main axle to rotate together, the rotation ring is arranged to cause the planetary gear to rotate, and the gear ring is fixedly connected with the handle, so that when the handle is gripped and the rotation ring is rotated, the planetary gear speed increasing mechanism increases the speed of the rotation inputted by the rotation ring and then the rotation is output via the main axle.