Patent ID: 7444913
Filing Date: 2008-11-04
Classification: B27B,Y10T

Abstract:
1. A parallel fence comprising: a fence body having a front end and a rear end and arranged and constructed to be placed on a worktable; a front guide and a rear guide respectively disposed on the front end and the rear end of the fence body; and a positioning device arranged and constructed to position and fix the front guide and the rear guide relative to a front rail and a rear rail disposed on the worktable; wherein the positioning device has a first operational position, a second operation position and a third operational position; and wherein the first operational position fixes the front and rear guides in position respectively relative to the front and rear rails; and wherein the second operational position prevents the front and rear guides from being removed from the front and rear rails in a first direction upwardly away from a surface of the worktable and permits the front and rear guides to move in a second direction along the length of the front and rear rails; and wherein the third operational position permits the front and rear guides to be removed from the front and rear rails in the first direction; wherein the positioning device comprises: a slider having an engaging portion engageable with an engaging recess from a lower side of the engaging recess, wherein the engaging recess is formed in one of the front or rear rails; a support mechanism arranged and constructed to support the slider from the lower side, so that the slider can move in a forward direction, a reward direction, and can vary a vertical position of the engaging portion; a control mechanism arranged and constructed to control the position of the slider, so that (1) the slider is pressed against a wall of the engaging recess in the first operational position, (2) the slider is movable in the forward and rearward directions within the engaging recess in the second operational position, and (3) the engaging portion of the slider is removed from the engaging recess in the third operational position.