FR2485134A2 - Disc brake pad wear indicator - has conductor completing alarm circuit through disc upon wear of covering insulation - Google Patents

Abstract

The disc (6) is positioned between two friction pads with linings (4,4a) on metallic support plates (5,5a). Each support plate carries a wear indicator (8) of electrically insulating material contg. a buried flat conductor (9) terminated in a connection tag (10) for wiring into the alarm circuit. Each indicator (8) features a hole through which the brake assembly pin (7) passes, and a clamp (12) fitting over the top of the support plate. The other end of the indicator is pref. V-shaped to fit into a notch in the top of the brake lining (4,4a).. The need to pierce the pad and to secure a wire into it by adhesive is eliminated. The support plate need not be modified essentially nor weakened by piercing.

Description

 Improvement of wear indicators for brake pads.

 The purpose of this addition is an improvement to the wear indicators for brake pads. The main patent relates to wear indicators for disc brake pads, in which the wear indicator consists of a plate of insulating material in which is embedded a conductive member having a plug for connection to the electrical signaling circuit, said insulating plate being mounted in an attached manner on the support of the friction lining.

 The purpose of this addition is to avoid the use of a pin or a rivet engaged in the wall of the wear indicator plate, while keeping the plate captive on the support member of the lining. friction.

 In accordance with the present addition, the insulating plate of the wear indicator has, on one of its edges, a stirrup which is engaged on one of the edges of the friction lining support and held against said edge by the one of the elastic transverse branches of a cross-shaped spring, one wing extending along the plane of symmetry of the disc, is mounted on pins secured to the support plates.

Other characteristics and advantages of the invention will be better understood on reading the following description of an embodiment and with reference to the appended drawings, in which:
Figure 1 is a front elevational view of an embodiment of a brake pad provided with a wear indicator according to the addition.

 Figure 2 is a plan view of the device shown in Figure 1.

Figure 3 is a cross-sectional view of the device shown in Figure 1
Figure 4 is an elevational view of another embodiment of a wear indicator on a brake pad.

 FIG. 5 is a plan view of the device shown in FIG. 4.

FIG. 6 is a cross-sectional view of the device shown in FIG. 1.

 In Figures 1, 2 and 3 there is shown a brake disc 6 which is disposed between two brake pads consisting of a friction lining 4, 4a, fixed on a metal support member 5, 5a. The support members 5, 5a are slidably mounted on pins 7, 7a engaged in holes 16, 16a of the support members.

 Between the support members 5, 5a is disposed a spring 17 in the form of a cross which consists of an elastic branch 17a exerting a pressure on the support members 5, 5a, said branch 17a being fixed on a wing 17b, the longitudinal axis is located along the plane of symmetry of the friction disc 6, said wing 17b being mounted on the pins 7, 7a on which the support members slide.

 The insulating pads of the wear indicators 18, 18a are provided with a conductive member 19 embedded in the wall of the pad which has on one of its edges a stirrup 20 which is engaged on one of the edges of the support member 5, 5a for a seal. The stirrups 20 is held in position against the edge of the support member 5, 5a by the folded tab 17c which has an elastic character.

In Figures 4, 5 and 6 there is shown another embodiment of the invention in which the support members 5, 5a are extended by bosses 21, 21a on which are mounted by means of rivets 22, 22a of the springs hairpin 23, 23a, the ends of which bear against the walls of a brake caliper 24 which has shoulders 24a, 24b against which the lower edges of the support members bear.

On the bosses 21, 21a are mounted insulating plates 25, 25a of wear indicators which have two opposite stirrups 26, 27 which are engaged on the edges of the boss 21, 21a.

The plate 25, 25a of the wear indicator is held captive on the boss by means of the rivet 22, 22a, because said plate is engaged on the boss before mounting the rivet and the spring. As described above, a conductive member 28, 28a embedded in the wall of the insulating plate 25, 25a is connected to the electrical signaling circuit.

Of course, various modifications can be made by those skilled in the art to the devices or methods which have just been described solely by way of nonlimiting example, without departing from the scope of the invention.

Claims (1)

Law claims Improvement to the wear indicators for disc brake pads, in which the wear indicator consists of a plate of insulating material in which is embedded a conductive member having a plug for connection to the electrical signaling circuit, said insulating plate being mounted in an attached manner on the friction lining support according to claim 1 of the main patent, characterized in that the insulating plate of the wear indicator has on one of its edges, a stirrup which is engaged on one edges of the friction lining support and held against said edge by one of the elastic transverse branches of a cross-shaped spring, one wing of which extends along the plane of symmetry of the disc is mounted on pins secured to the plates support. 20 / Improvement to the wear indicators according to claim 1 of the main patent, characterized in that the insulating plate of the wear indicator has two opposite stirrups which are engaged on the edges of a boss extending the lining support which is provided of a hairpin spring, the two branches of which bear against the brake pad1 said pad being held captive on the boss by the spring fixing rivet.