| 摘要 |
<p>A strap tightener comprising an anchoring element for fixedly anchoring the strap tightener, an operating lever pivoted to the anchoring element about a pivot axis, a strap reel mounted coaxially with the pivot axis, a ratchet wheel non-rotatably connected to the strap reel, a holding pawl displaceable mounted on the anchoring element and spring-biased to engage the ratchet wheel, a driving pawl displaceably mounted on the operating lever and spring-biased to engage the ratchet wheel, the operating lever being drivingly connected to the strap reel by means of the driving pawl and the ratchet wheel being swung in one direction, and being disengaged from the strap reel when being swung in the opposite direction, and means operatively connected to the driving pawl to lock the operating lever in a rest position adjacent to the anchoring element with the holding pawl locked in engagement with the ratchet wheel; the means comprising a hook projecting from the driving pawl transversely of the path of movement thereof and open towards the pivot axis of the operating lever to receive, in the rest position of the operating lever, the holding pawl at the end thereof which is remote from the ratchet wheel, the hook providing a force component transversely of the path of movement of the driving pawl by pressure applied to the holding pawl in a direction away from the ratchet wheel, the force component acting towards the rest position of the operating lever.</p> |
