Strapping device with an anti-reversing design used when preparing to loose the strap

Abstract

A strapping device includes a main frame and a lever pivotally mounted to each other by an axle. The main frame has a first stop plate slidably mounted to selectively engage to ratchet that is mounted on the axle and the lever has a second stop plate mounted to drive the ratchet. A groove is defined in the main frame and has one side formed with a limiting side. The strain of the strap can reverse the axle to release the strap when the second stop plate is received in the groove. A stopper radially extends from the main frame and has a protrusion extending therefrom. The protrusion of the stopper prevents the lever from being backward moved to the original position due to the strain of the tightened strap.

What is claimed is:  
     
         1 . A strapping device comprising an axle extending through a main frame and a lever for pivotally mounting the main frame and the lever to each other, the axle including two opposite ends each having a ratchet mounted between the main frame and the lever for driving the axle, the ratchet having multiple teeth formed on a periphery thereof, each tooth having a sliding side formed to allow a first stop plate and a second stop plate being moved to an adjacent tooth of the ratchet, the axle having a slot diametrically defined therein and extending through the axle, the slot adapted to allow a strap penetrating the axle and wound on the axle, the first stop plate laterally extends through the main frame and partially received in the main frame, the first stop plate reciprocally slidably mounted in the main frame and selectively engaging to a corresponding one of the teeth of the ratchet, the second stop plate laterally extends through the lever via the second and partially received in the lever, the second stop plate reciprocally slidably mounted in the lever and selectively engaging to a corresponding one of the teeth of the ratchet, the main frame having a sliding portion formed thereon, the sliding portion including a first end connected to the main frame and a second end having a stopper radially extending from the main frame, the stopper having a protrusion extending therefrom and having one side flush on the second end of the sliding portion, the protrusion preventing the lever back to the original position when releasing the strain of a tightened strap, a groove defined in the main frame adjacent to the stopper, a raised portion extending from the lever to backward push the first stop plate, the second stop plate engaged to the ratchets when the second stop plate is moved within the sliding portion and then the raised portion separated relative to the first stop plate.