Lucas Industries Public Limited Company

Lucas Industries Limited

Girling Limited

Michael J England

Brian Ingram

Hugh G Margetts

David A Harries

Stephen Hayward

An automatic brake adjuster has a strut composed of two parts between which there is a non-reversible threaded connection, relative rotation between the parts to vary the strut length being controlled by a clutch ring urged by a spring into clutching engagement with the housing. In order to prevent unwanted de-adjustment, the clutch ring forms a uni-directional locking connection with a housing by means of ratchet teeth on the external periphery of the ring and a pawl mounted in the housing.

Automatic adjuster

An automatic adjuster includes a two part strut interconnected by a non-reversible thread so that extension of the strut under the influence of an adjuster device is effected by relative rotation between the two parts. The adjuster device includes a spigot, rotation of which is controlled by a clutch member as a result of a cooperation between helical teeth respectively on the strut part and spigot and also uni-directionally couples the spigot to a fixed member so that in the event of temporary clutch disengagement due to vibration, rotation of the spigot in the de-adjusting direction is prevented by rotation thereof is the adjusting direction is permitted when required.

An actuator for a shoe drum brake has a body containing a tappet engaging one of a pair of brake shoes, and a split tappet of which the outermost piston engages the other brake shoe. A mechanical wedge actuator acts between the tappets for emergency and parking operation. The piston cooperates with an automatic adjuster of which a component normally engages an abutment member which bears against a shoulder within the body to isolate the adjuster from the piston of the split tappet and thereby from the other tappet.

Actuator for an internal shoe drum brake

An automatic slack adjuster comprises a pair of thrust assemblies. Each thrust assembly acts between a cam and a respective shoe-end and is guided to slide axially in a bore in a housing. Each thrust assembly comprises a nut which engages with, and is held against rotation with respect to, a respective shoe-end, and a screw-threaded tappet having a piston part which slides in the bore, and an integral threaded stem of reduced diameter which is screwed through the nut. The piston parts are both provided with gear teeth to enable them to be rotated together by the engagement of a crown wheel, or a pair of pinions carried by opposite ends of a transverse shaft which is rotatable in a bore normal to a bore in which the cam shaft carrying the cam is rotatable.

Automatic slack adjusters for vehicle shoe-drum brakes

In an internal shoe-drum brake a thrust transmitting member is interposed between a shoe-end and an abutment for that shoe-end. The thrust transmitting member has a planar face engaging with the abutment and an arcuate face which is received in a complementary recess of arcuate outline in the shoe-end.

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West Midlands, United Kingdom

Michael J England