Abstract: A rail vehicle slack adjuster is provided with a barrel detented against rotation under normal working conditions. However, rotation of the barrel effects adjustment of the length of the adjuster. Thus, by means of a flexible clip ring splined to the barrel and detenting into a notch on the non-rotatable pull rod, manual force permits the clip ring to be distorted out of the notch for rotation of the barrel to accomplish manual adjustment when replacing brake blocks, or the like.

Abstract: A rail vehicle slack adjuster of the axial type has a barrel (4), a spindle (2), and an adjuster nut (29).In order to prevent the spindle (2) from leaving its thread engagement with the adjuster nut (29) the spindle is provided with a stop ring (64) so located that it will contact a barrel part (57) and, via the barrel and a barrel spring (53), bring about a closing of a main clutch (49, 50) between a pull means (6, 48) and the adjuster nut.

Abstract: An axial type rail vehicle slack adjuster has a barrel (4) with a set of circumferential notches (62) retaining elements (62, 55, 57) against axial movement along the barrel which coact with slack adjuster mechanism elements (25, 54, 60) to stop axial movement thereof relative to the barrel notch.

Abstract: A rail vehicle slack adjuster of the double-acting, clearance-sensing, axial type has an elongated barrel (4), a pull means (6, 48), a non-rotatable spindle (2), a leader unit (8-27) and an adjuster unit (29-52) cooperating with the spindle in the barrel, and a barrel spring (53) acting on the adjuster unit. A leader nut (8) in the leader unit can be clutched (13-16) to the barrel under the action of a pay-out spring (21). An adjuster nut (29) in the adjuster unit can be clutched to the pull means.The adjuster unit (29-52) includes a non-rotatable spline sleeve (40) acted on by the pulling brake force from the pull means (6, 48) and the opposite force from the barrel spring (53). The leader nut (8) is provided with a telescope sleeve (11) and a leader ring (27), both only axially movable on the leader nut and being clutchable to the spline sleeve. The leader nut is also provided with declutching means (13-15) enabling the nut to rotate in spite of the clutch engagement (16) with the barrel (4).