Modified back rack

摘要

A modified back rack has a front frame, a supporting stand mounted movably on the front frame, and a positioning mount mounted securely on the front frame. The front frame has an adjusting base mounted on the front frame. The adjusting base has a protrusion formed on the adjusting base, a track area formed on the adjusting base, and multiple positioning grooves formed on the protrusion. The supporting stand has a movement recess formed on the supporting stand, a movement space formed in the movement recess, and a moving assembly mounted in the movement recess. The moving assembly has a moving block, a swinging arm mounted pivotally in the moving block, and a moving pin extending from the swinging arm. The moving pin is placed in the track area. The modified back rack has height adjusting function that can meet different requirements.

主权项

1. A modified back rack comprising:
a front frame having
an adjusting base mounted on a rear end of the front frame and having
a protrusion formed on a central surface of the adjusting base;a track area formed on the adjusting base and around the protrusion; andmultiple positioning grooves formed on an outer surface of the protrusion, communicating with the track area and vertically spaced apart from each other; a supporting stand mounted movably on a rear side of the front frame and having
a movement recess formed on a top end of the supporting stand and having
a movement space formed in the movement recess; a positioning mount mounted securely on the rear side of the front frame and mounted through by the supporting stand; and
a moving assembly mounted in the movement space of the movement recess and havinga moving block;a swinging arm mounted pivotally in a front end of the moving block; anda moving pin extending forward on a bottom end of the swinging arm, mounted through the positioning mount, placed in the track area of the front frame and held in one of the positioning grooves of the track area to adjust a vertical position of the front frame; wherein the front frame can move along the supporting stand in a vertical direction.