Strip safe-releasing device using ratchets

Abstract

A strip safe-releasing device using ratchets is disclosed. A body and handle is connected by a shaft. Since the stopping piece of the body with respect to the handle is installed with a sliding groove. Thereby, the handle can be rotated so that the stopping piece is inserted into the sliding groove, then the convex portion ejects the buckle to release the ratchet. Thereby, the shaft is driven by the reaction force of the strip so as to release the tension of the strip. Since the rotation of the ratchet will synchronously drive the convex portion of the handle not to eject the buckle. Thus, the buckle moves forwards to engage the ratchet and confine the rotation of the shaft. Therefore, each time the shaft rotate through a few angles, the tension releases a little. Therefore, the tension of the strip is released step by step in a safe way.

What is claimed is:  
     
         1 . A strip safe-releasing device using ratchets, wherein the device is formed by a shaft passing through a body and a handle; two sides of the body is protruded with respective ears and two sides of the handle are protruded with pivotal portions; the shaft passes through the two ears and two pivotal portions so that the body is pivotally connected to the handle; 
 a ratchet is formed between each of the two ears and each of the two pivotal portions; each ratchet has a plurality of teeth; the shaft has a penetrating groove which axially penetrates through the shaft; a strip winds around the groove;    each of two sides of the body has a trench for being embedded with a buckle; a spring is formed between the buckle and the body; by the ejecting force of the spring; the buckle is engaged with the ratchet; each of the two sides of the handle has a trench for being embedded with a stopping piece, wherein the stopping piece is slidable in the trench; an elastomer is installed between the stopping piece and the handle; by the elastic force of the elastomer, the stopping piece is engaged with the ratchet;    from the rotating direction of the two ears of the body with respect to the handle, in the stopping piece, a convex portion, a stopper, a sliding groove and a slot are sequentially arranged; two pivotal portions of the handle each have a convex portion at position with respect to the buckle;    the concave portion of the stopping piece dose not contact the stopping piece; a height of the stopping piece is higher than the teeth of the ratchet so that as the stopping piece passes through the stopper, it is separated from the ratchet; a width of the sliding groove is about one node of the ratchet;    a side of the sliding groove adjacent to the stopper is a guide tilt surface; a side of the sliding groove adjacent to the slot is a resisting surface; when the ratchet is stopped by the buckle and is engaged therewith, the guide tilt surface is corresponding to a back side of a tooth of the ratchet; a height of the guide tilt surface is higher than the ratchet; thereby, when the stopping piece slides on the guide tilt surface, it will be lifted and then separates from the ratchet; when the stopping piece resists against the resisting surface, the convex portion is at a position in which it ejects the stopping piece so that the stopping piece separates from the ratchet; when the stopping piece is embedded in the slot, it separates from the ratchet, and then the convex portion is at position at which it will eject the buckle so that the stopping piece separates from the ratchet.    
     
     
         2 . The strip safe-releasing device using ratchets as claim in  claim 1 , wherein near an upper edge of the guide tilt surface is installed with a stopping surface for resisting the stopping piece so as to avoid that the stopping piece runs away from the sliding groove through the guide tilt surface.