Rope tightener

A rope tightener comprising:

• a bottom seat having a bottom plate, an annular body portion extending upwardly from the bottom plate, an accommodating space formed by the bottom plate and the annular body portion, and a rotation axle extending upwardly from the bottom plate and located in the accommodating space, the annular body portion having at least one pawl;
• a roll-up disc having a pivot hole, the pivot hole being sleeved onto the rotation axle to make the roll-up disc rotatably disposed in the accommodating space and slidable upwardly and downwardly along the rotation axle;
• and
• a cover fixedly connected to the roll-up disc, thereby capable of driving the roll-up disc to rotate, the cover having a plurality of ratchet teeth, the ratchet teeth and said at least one pawl corresponding to each other, the cover being able to drive the roll-up disc to displace relative to the bottom seat between a pressed-down position and a pulled-up position, when the cover is located at the pressed-down position, the ratchet teeth being engaged with said at least one pawl, enabling the cover to drive the roll-up disc to rotate about the rotation axle in a single direction, when the cover is located at the pulled-up position, the ratchet teeth being separated from said at least one pawl, enabling the cover to drive the roll-up disc to rotate freely;
• and
• an elastic member mounted to the roll-up disc and provided with two elastic abutted portions;
• wherein an outer peripheral surface of the rotation axle of the bottom seat has a first annular groove and a second annular groove;
• when the cover is located at the pressed-down position, the elastic abutted portions of the elastic member are wedged in the first annular groove of the rotation axle;
• when the cover is located at the pulled-up position, the elastic abutted portions of the elastic member are wedged in the second annular groove of the rotation axle.