| 摘要 |
<p>The invention relates to a castor with a running wheel fork (34) which receives a running wheel (26) between its fork legs, having a blocking device on the trailing side in order to block the ability of the running wheel to rotate and the ability of the running wheel fork (34) to pivot, the said running wheel fork (34) being pivotable with its fork back about the axis of a kingpin by means of a steering roller bearing which runs perpendicularly to the axis of the running wheel and is held by the said kingpin, the locking device being in the form of a two-armed sprung or spring-loaded tilting lever (6) which is mounted on the fork back (4) so as to be tiltable over the running wheel, extends with a trailing-side tilting arm (28) above the running wheel and under a fork back extension which is arranged on the trailing side, with a roller bearing-side tilting arm above the running wheel as far as the steering roller bearing and can be tilted into a locked position counter to its spring by means of an expansion toggle which extends over the length of the said tilting lever (6) with a web through a longitudinal slot of the extension of the fork back and can be locked in the overdead-centre position of the expansion toggle (2), the tilting lever (6) engaging in the locking position at one end in a toothing (13) of the spherical disk of the steering roller bearing and resting over the length of the trailing-side tilting arm with a braking surface (20) on the tread of the running wheel, the expansion toggle resting with a toggle component with lower shoulders in counter bearing recesses at the end of the tilting arm and with upper shoulders on the fork back extension, being clamped in between the latter and the tilting lever and having above the fork back extension a release actuation tread surface and a locking actuation surface outside the lower shoulders, the tilting lever (16) having in the region of the braking surface a downwardly open, upwardly projecting, pot-shaped receptacle recess for a securing nut which receives a brake screw which widens on the running wheel side and is provided with the braking surface whilst the brake screw, lying under the hole in the release position of the tilting lever, is adjustable by means of the hole, the said invention being characterised in that the expansion toggle (2) is bent twice at its release actuating tread surface (21) with respect to the web (1) in such a way that the vertical distance between the upper edge of the expansion toggle and the upper edge of the roller housing corresponds in the locked position to the vertical distance between the upper edge of the locking actuation surface of the expansion toggle in the release position, and the bent web projects in the locked position beyond the outer final limiting edge of the fork back extension by a distance (4). <IMAGE></p> |
