Societe De Prospection Et D'inventions Techniques Spit

Franck Vernet

Jean-Paul Barthomeuf

The dowel comprises a body (1), with two elongate lateral arms (4), each having a groove, and a bore, opening out between the arms (4) for a fixing screw (22) to pass through, a rocker (2) sliding and pivoting on the arms (4) of the body (1) by means of two pivots (10) in their grooves, with a ramp which interacts with the end of the screw (22) in order to cause the rocker (2) to pivot, and an orifice for interacting, in the tilted position, with the fixing screw (22) and causing the rocker (2) to slide. Shearable pins (19) are provided for temporarily holding the rocker (2), detachable under the action of the screw (22), and which, when the dowel is inserted into a wall, drive the rocker (2) with the body (1). The body (1) and the rocker (2) are moulded simultaneously a single piece from injectable material. The dowel can be used for fixing a component to a gypsum board.

Dowel with rocker, cast in a single piece, and its method of casting

The pin comprises an expansion body (2) and, around the body, an expandable tubular sleeve (3) made from a flexible material, with a stop collar (12) and an end (10) forming a nut. With the pin extending through an orifice pierced in the wall with the sleeve collar (12) bearing against the front face of the wall, the nut (10) interacts with an end part of the body, is driven towards the collar (12) and brings about the expansion of the sleeve (3) and its squashing against the rear face of the wall. The body (2) is tubular, in order to receive a screw for fixing a piece upon the wall, and has, unlike the end part, a collar (7) for bearing against the one (12) on the sleeve (3). The sleeve (3) is plastically deformable and means (42) are provided for preventing the rotation of the body (2) with respect to the sleeve (3) in the opposite direction to the direction of expansion. The end of the body (2) is provided with a piercing bit (4). The pin of the invention can be applied well to bricks.

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Bourg de Peage, France

Franck Vernet