| 摘要 |
<p>There is disclosed a ratchet device, especially for awnings, comprising two rotatably interconnected elements, one element having a portion formed as a sector of a ratchet wheel and the other element being provided with a pawl cooperating with the teeth of the first element, and a movable member which prevents or permits interengagement of the pawl and the teeth due to relative rotation of the elements. In a known device of this type, the movable member is a control tooth rotatably connected to the pawl. This demands a complicated construction which, when the parts are subjected to wear, may cause malfunction of the device. In the device according to the invention, a portion of the movable member is pressed against a portion of the first element, and the member is adapted to be moved upon influence of the frictional force which is brought about between the member and the first element during relative rotation of the elements.</p> |
