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A friction brake disk is formed having a plurality of T-shaped slots extending through a peripheral edge thereof from one braking face surface to the other and each slot carries a keyslot reinforcement comprised of a metallic insert member having the same T-shaped configuration such as to be easily

A friction brake disk is formed having a plurality of T-shaped slots extending through a peripheral edge thereof from one braking face surface to the other and each slot carries a keyslot reinforcement comprised of a metallic insert member having the same T-shaped configuration such as to be easily inserted in the slot in the axial direction of the disk but restrained from being removed in the radial direction. Each insert member is locked within the slot in the axial direction by at least one retaining clip that is fastened to the insert member and extends beyond the slot into the face surface of the disk.

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1. A friction disk having opposite surfaces forming annular braking faces lying in planes transverse to an axis of rotation of the disk and a plurality of evenly-spaced, substantially T-shaped slots formed within a peripheral edge of the disk and extending therethrough from one braking face surface

1. A friction disk having opposite surfaces forming annular braking faces lying in planes transverse to an axis of rotation of the disk and a plurality of evenly-spaced, substantially T-shaped slots formed within a peripheral edge of the disk and extending therethrough from one braking face surface to the other, a top portion of the T-shaped slot being oriented radially inwardly from the peripheral edge of the disk; and a keyslot reinforcement means mounted within each of said T-shaped slots comprising a metallic insert member having a substantially T-shaped peripheral configuration which matches the T-shaped slot in the disk such as to be received in mating relationship within the slot in the axial direction from one braking face surface of the disk to the other but restrained from being removed from the slot in the radial direction, said insert member having a substantially U-shaped keyslot formed therein and facing radially outwardly of the disk and, retaining means fastened to opposite sides of the insert member and extending to coact with the face surfaces of the disk such as to capture the insert member within the T-shaped slot. 2. The friction disk as set forth in claim 1 wherein the disk comprises a carbon based material. 3. The friction disk as set forth in claim 1 wherein the T-shaped slots are formed within an outer peripheral edge of the disk. 4. The friction disk as set forth in claim 1 wherein the T-shaped slots are formed within an inner peripheral edge of the disk formed by a bore passing through the axial center of the disk. 5. The friction disk as set forth in claim 1 wherein the retaining means comprises a clip in a substantially U-shaped configuration having a pair of spaced-apart legs interconnected by a bridge portion, each said leg fastened to the insert member and coacting with an opposite braking face surface of the disk such as to capture the insert member within the T-shaped slot. 6. The friction disk as set forth in claim 5 wherein the retaining means comprises a pair of U-shaped clips each said clip being positioned on an opposite side of the U-shaped keyslot within the insert member. 7. The friction disk as set forth in claim 6 wherein each said clip is rotated 90 degrees such that the bridge portion of each clip spans the keyslot of the insert member from one braking face surface of the disk to the other to provide a drive key bearing face surface within the keyslot. 8. The friction disk as set forth in claim 7 wherein the bridge portion of each said clip is hardened to provide a long-life bearing surface. 9. The friction disk as set forth in claim 1 wherein the retaining means comprises flat, substantially rectangularly-shaped metal pieces fastened on opposite braking face surfaces of the disk by rivets passing through the insert member. 10. The friction disk as set forth in claim 1 wherein the top portion of the T-shaped slot in the disk has opposite end portions defining a specific geometric configuration.