Patent ID: 6869260

Claim:
An anchorage comprising two interengageable members, one being adapted for the attachment of an element to be secured; a first member having a first axis and a mushroom head with a rim; and a second member having a generally U-shaped channel defining an open mouth for receiving part of the rim of the mushroom head when said rim is subjected to a radial movement into the mouth of the U-shaped channel; said movement being possible only when the first member has a first orientation about the first axis with respect to the second member; said members when engaged being mutually rotatable about said first axis to a second orientation in which separation in any radial direction is obstructed by the mutual co-operation of said members; said second member having a projection co-axial with the axis of the semi-circular end of the U-shaped channel; and said mushroom head having a radial groove along which the projection moves during engagement of said members, the mutual rotation to the second orientation trapping the projection in the groove.