| 摘要 |
<p>The invention relates to a castor (1) having a wheel (2) whose pivoting about a vertical shaft (3) can be locked or released by the rotation of the wheel (2) in one or other direction. The lower lever arm (17b) of an angled double lever (17) extends into the space situated above the axle (4) of the wheel (2) and comprised between a side face (2c) of the wheel (2) and the adjacent cheek (5) of the yoke (6), and carries a friction shoe (19) that is applied elastically against the side face (2b, 2c) of the wheel (2). The upper lever arm (17a), which is accommodated in the space bounded by the mounting yoke (6) above the running surface (2a) of the wheel (2), includes a locking plate (22) received in a locking notch (23) cut into an element (9, 10) attached to the pivot shaft (3). A guide recess (26) cut into the annular cap (7) of the mounting yoke (6) on both sides of its median plane, guides a portion of the upper lever arm (17a) throughout its travel between its two extreme positions. <IMAGE></p> |
