Securable fastening device

A clampable fastening device for mounting fittings or other objects in an opening or recess of a wall, said fastening device comprising:

• a head part which is to be arranged in a mounted position on a one outer side of the wall and which is intended to cover an outer rim of the opening or recess, a foot part which, in the mounted position, proceeds from the head part, and which is penetrable through the opening or which is projectable into the recess;
• and
• holding elements which are displaceable relative to one another, against or with a spring force, in a channel formed in the foot part;
• wherein the holding elements project from the foot part along direction of an outer surface of the foot part;
• wherein a free end of each of the holding elements has an inclined surface for supporting the foot part without play on a rim or edge of the opening of an other inner side of the wall, or each of the free ends of the holding elements has obliquely arranged points for penetrating into the wall surface of the opening or recess of the wall;
• wherein the foot part and the holding elements are separate parts;
• wherein the holding elements are displaceable in a direction of displacement along the channel by means of a screw having a conically shaped region;
• wherein the holding elements are plates which are arranged next to one another and are elongated in the direction of displacement, where the plates jointly form with the channel walls a receiving space for receiving a compression spring which provides the spring force;
• wherein the receiving space extends in the direction of displacement and becomes smaller when the plates are displaced from a rest position and, as a result, compresses the spring;
• wherein the conically shaped region of the screw includes a conically shaped foot;
• wherein each of the plates has, near an end of the respective plate other than the respective free end, a first inner inclined surface and a second inclined surface, where at least one of the first inner inclined surface and the second inclined surface cooperates with the conical foot;
• wherein the first inner inclined surfaces are offset with respect to one another in the rest position of the plates but move towards each other when the plates are displaced into a working position;
• wherein each of the plates has, at the free end, one or more outer inclined surfaces or teeth in the vicinity of the wall or the opening or recess which cooperate with the wall;
• and
• wherein the outer inclined surfaces or teeth lie inside the channel of the foot part in the rest position of the plates relative to one another but move out of the channel of the foot part and away from one another when displaced into the work position.