Patent ID: 7871031

Claim:
A device having a liftable strap supply reel comprising: a housing having an inner space, an opening, a first pivoting portion and a second pivoting portion; a liftable mechanism including a rotating shaft, a first arm, a second arm and a handle; said rotating shaft being pivoted on said first pivoting portion and being able to rotate within a preset range; said first arm having a first length and being disposed with a rotatable strap supply reel for storing a strap winding thereon; said second arm having a controlling end and having a second length; said second length being shorter than said first length; a pushing force generator having a pushing member and a pushing body, said pushing member connecting with said controlling end, said pushing body connecting with said second pivoting portion; said liftable mechanism containing a home position, a critical position and a lift-up position; when said liftable mechanism being positioned at said home position, said pushing member generating a force on said second arm so as to create a torque to a predetermined direction and cause a feeding roller staying in said inner space; when said lifting mechanism being positioned at said critical position, said pushing member generating no force on said second arm so as to create zero torque; when said lifting mechanism being positioned at said lift-up position, said pushing member generating another force on said second arm so as to create another torque opposite to said predetermined direction, so that said second arm rotates and lifts up and also causes said strap supply reel moving outside of said inner space and stays at a height approximately near a waist of a human.