Spreading disc brake and cam actuator therefor
AssigneeGirling Limited
InventorsRoy Campbell, Anthony George Price
Life of this patent
Estimating the term…
Abstract
In a spreading disc brake recesses for co-operation with balls located between pressure plates comprise straight grooves of progressively varying depth in inserts mounted in the pressure plates for angular movement about axes normal to the planes of the plates.
Claims11
An insert for a pressure plate in a brake of the spreading disc kind which includes pressure plates having opposed cooperating camming surfaces thereon and balls co-operating with said surfaces to spread said plates upon relative rotation therebetween, said inserts comprising a circular member adapted to be rotatably mounted in a recess in a pressure plate and incorporating on one face a straight groove having a longitudinal axis and of progressively varying depth along said axis for co-operation with a ball located in the groove and in a complementary groove in an insert in a co-operating pressure plate, the circular member also incorporating on a face opposite said one face a rearwardly projecting peg adapted to be received in an opening in the pressure plate offset from the axis of the circular member.
A disc brake of the spreading disc kind including pressure plates having opposed cooperating camming surfaces thereon and camming elements cooperating with said surfaces to spread said plates upon relative rotation therebetween, said camming elements comprising balls and said camming surfaces comprising straight grooves having longitudinal axes and of progressively varying depths along said axes, said grooves receiving said balls and being formed in inserts received in complementary recesses in said pressure plates, said inserts being angularly movable in said recesses about the axes of said inserts normal to the planes of the plates to enable said balls to move along said straight grooves in a path which is substantially circumferential with respect to the axes of said plates, and means for restricting the angular movement of the inserts about their said normal axes to an amount not in excess of predetermined limits.
A pressure plate for a disc brake of the spreading disc kind which includes pressure plates having opposed cooperating camming surfaces thereon and balls cooperating with said camming surfaces to spread said plates upon relative rotation therebetween, said pressure plate comprising a plate, a plurality of inserts received in complementary recesses in said plate and being angularly movable in said recesses about axes normal to the plane of the plate, said camming surfaces on said plate comprising straight grooves having longitudinal axes formed in said inserts, said grooves being of progressively varying depth along said axes and being adapted to receive said balls, and means for restricting the angular movement of the inserts about their said normal axes to an amount not in excess of predetermined limits.
Dependencies are inferred from the claim text.