US 4,226,306 AGranted

Apparatus for actuating a braking unit

AssigneeSchweizerische Lokomotiv-und Maschinenfabrik

InventorArnold Schafer

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Abstract

The braking control means (33,33a) which serve to set the brakes are connected in parallel and the shut-off and lifting control means (33', 34) which permit lifting of the brakes are connected in series with the braking units (9). A single intact braking control means (33,33a) ensures braking, while all shut-off and lifting control means (33',34) must be connected correctly for lifting the brakes. The control means (33,33a,34) are provided with positioning means (41) which can be actuated via two control lines (42a, 43a) each and a switch (48) which can be switched between an "on" position lifting the brake and an "off" position which causes the brake to be set and in which at the same time a short-circuit-like connection between the two control lines (42a, 43a) is established in order to prevent any energy supply to the positioning means (41) and, thereby, unintended lifting of the set brakes.

Claims13

Dependent claims

Apparatus for actuating at least one braking unit;

said apparatus comprising
at least two braking control means for effecting a braking action in the braking unit;
at least two shut-off means for preventing a braking action in the braking unit, each shut-off means being coupled to a respective braking control means;
at least one lifting control means for re-setting the braking unit;
actuating lines connecting said braking control means in parallel to the braking unit and connecting said lifting control means and said shut-off means in series to the braking unit;
and
positioning means for switching each of said braking control means and said lifting control means between a respective operating position and shut-off position;
said operating position of each said braking control means corresponding to an actuation of the braking unit into a braking condition and said shut-off position of each said braking control means corresponding to a blocking of the braking of the braking unit, said operating position of each said shut-off means and said lifting control means corresponding to a release position permitting re-setting of the braking unit and said shut-off position of said shut-off means and said lifting control means corresponding to said operating position of each said braking control means.

5 more elements

In combination,

at least one braking unit for a vehicle, said unit being operable between a released condition and a braking condition;
an actuating means for moving said braking unit between said conditions, said actuating means comprising a pressure medium source, an actuating line connecting said source to said braking unit to convey a flow of pressure medium thereto for moving said braking unit from said braking condition to said released condition and a plurality of control systems for controlling a flow of pressure medium in said line,
at least two of said control systems being connected in parallel between said source and said braking unit and including a valve having a braking control means movable between a shut-off position blocking a flow of pressure medium from said braking unit and an operating position permitting the flow of pressure medium to pass from said braking unit and a shut-off means coupled to said braking control means to move therewith between a shut-off position blocking a flow of pressure medium to said braking unit and an operating position to permit a flow of pressure medium to said braking unit;
at least one other of said control systems being connected in series with said shut-off means of each said two control systems, said one control system including a lifting valve movable between a shut-off position blocking a flow of pressure medium to said braking unit and an operating position to permit a flow of pressure medium to said braking unit;
and
each said control system having a positioning means for switching a respective valve between a respective shut-off position and operating position.

3 more elements

Dependencies are inferred from the claim text.