Patent ID: 8015901
Filing Date: 2011-09-13
Classification: B25B

Abstract:
1. A tie rod adjustment open-end wrench comprising: a clamping mechanism that clamps a tie rod hexagonal portion by approaching a tie rod from a side of the tie rod; and a rotation drive mechanism that rotates the clamping mechanism while the tie rod hexagonal portion is clamped, wherein the clamping mechanism includes: a pair of contact portions facing each other which is capable of directly contacting the tie rod hexagonal portion; and an open-close drive mechanism that causes the both contact portions to move away from and approach the tie rod hexagonal portion, the open-close drive mechanism operates independently of the rotation drive mechanism, wherein the open-close mechanism of the clamping mechanism includes: a pair of slide plates that move away from and approach each other in slide movement, a linear actuator, a cam mechanism that converts movement of the linear actuator into open-close movement of the pair of slide plate, and a spring that urges the pair of slide plates always in opening directions; the pair of slide plates and the spring are held rotatably about a center axis of the tie rod hexagonal portion by an annular external gear that is disposed at such a position as to surround the pair of slide plates and the spring; the annular external gear has a C-shape with a cutout portion; the cutout portion is disposed at an open-end portion into which the tie rod is inserted when the clamping mechanism approaches the tie rod from the side of the tie rod; mutually facing end surfaces of the slide plates, as the contact portions, are formed in a configuration of mutually parallel flat surfaces; and