Patent ID: 6134801
Filing Date: 2000-10-24
Classification: G01B

Abstract:
A braking structure of a measuring tape comprising a front wall, a rear wall, a driving means and a braking wheel; wherein the driving means includes a shaking shaft outside the front wall, a rotary disk connected with the shaking rod, a fixing ring fixed on the outer wall of the front wall, a buckling wheel, a measuring tape, and a braking wheel, characteristic in that a short shaft is projected from the side of the braking wheel, the short shaft and the periphery thereof are inserted into the measuring tape wheel so that the measuring tape wheel is resisted against the braking wheel to rotate, an inclined body inclined gradually is formed on the side of the braking wheel, a convex block is formed on the highest point of the inclined body, while another convex block is formed on the inclined body formed in the rear wall, as the measuring tape wheel is rotated along a pull-out direction, the inclined plane of the braking wheel is rotated on the inclined plane of the rear wall to ascend upwards gradually so to press the measuring tape wheel, thus the braking wheel will resist against the measuring tape wheel, when the measuring tape wheel is rotated toward the direction of withdrawing the measuring tape, the braking wheel will descend along the rotation of the inclined plane, thus the friction applied on the measuring tape wheel is released, therefore, no matter the force for pulling the measuring tape is large or small, the desire length of the measuring tape is pulled out steadily and the idle rotation of the measuring tape is prevented.