| 摘要 |
<p>A hand brake for railroad cars comprising a housing including a front casing and a rear or back plate, between which an operating shaft is journaled (that bears the usual vertical hand wheel), and within which is mounted the brake drum and a release wheel in concentric relation to the operating shaft. A ratchet mechanism permits winding of the brake chain in one direction only, with a clutch device releasably coupling the operating shaft to the ratchet mechanism, and the winding of the drum being through a non-rotating but gyrating pinion that meshes with a ring gear that is part of the drum, with the pinion being actuated through an eccentric sleeve mounted on the operating shaft that is to be rotated with the shaft to cam the pinion and thereby provide its gyrating motion. The eccentric sleeve is threadedly connected to the shaft and includes a clutch collar that is part of the clutch device, with the threading having a hand such that under the tension in the brake chain, the clutch device is in clutching relation with the ratchet mechanism for wind up purposes, but on operation of the shaft for controlled release of the brake, the clutch device loosens sufficiently for brake chain let out under the control of the operator. The release wheel is in the form of a spider that is concentric with the shaft, and with which a brake release mechanism is associated to fix the release wheel against movement for chain winding, and to which the pinion is operably connected to provide a purchase against which the pinion acts in serving to turn the winding drum. For quick release of the brake, the release mechanism is actuated to release the release wheel which then turns with the brake drum as the chain is released.</p> |
