FR2524526A2 - Anchor fixed to vertical wall - has truncated female piece bedded in wall masonry - Google Patents

Abstract

The female piece (1) of the anchor has a greater section at its base (3) that at the front end (6) and the base is fixed solidly to a plate (4) perpendicular to the axis of the piece. The female piece is a hollow truncated cone tube (2) with the large base fixed to the plate. The ratio of the difference in diameter of the two cone ends to its height is about 0.02. The male part of the anchor is introduced into the female part after removing an end stopper.

Description

 This certificate of addition relates to a device for anchoring to a vertical wall of means aiding construction, maintenance and / or security, such as scaffolding, nacelles, safety barriers or the like, as provided for in his mind. in the main patent.

State of the prior art and drawbacks.

 With female organs with internal cylindrical section, the expandable male organ, despite suitable tightening, can have the drawback of being able to accidentally extract itself from its housing. This is what can happen when an exceptional load is applied to the ranial organ, for example in the test which consists in making it bear a load of a hundred kg falling from a height of four meters; it is a test which is applied to reproduce what could occur when a person falls. Exceptionally high efforts can also occur when one wants to maintain a vertical scaffolding accidentally stressed horizontally. In these latter cases, the male organ must be able to maintain itself in the female organ under an effort of the order of two tonnes.

 However, experience has shown that with a cylindrical female organ the male organ, despite correct tightening, could be extracted under an effort not exceeding one ton.

 Solving the problem of the joining of male and female organs is one thing, but it is still necessary that the female organ is securely sealed and kept deep in the masonry.

 It is these two problems which the present addition is to solve.

Statement of the invention.

The device of the invention is mainly characterized by the fact that the female organs have a larger section in the bottom than at the edge and that their bottom is made integral with a plate perpendicular to the axis of said female organ
More specifically, the female organ has the shape of a hollow truncated cone with its large base fixed on a plate larger than said large base.

Solution to the problem. Industrial benefits and results
Naturally the male organ is designed to be able to enter the interior of the small base of the female organ. When it is fully depressed, it can be expanded by the maneuver explained in the main patent. If a large axial force tending to extract the male organ from the female organ is exerted on said male organ, the expanded part of the male organ will tend to tighten more strongly inside the hollow truncated cone and its extraction will become impossible without bursting the female organ. I1 goes without saying that it is calculated so that it withstands these efforts taking into account the axial force of the order of two tonnes which is exerted for the extraction of the male organ.

 On the other hand, the taper of the female organ helps to prevent its loosening from the masonry.

However, the essential anchoring of this female member in the masonry is ensured by the plate fixed perpendicular to the end of the female member.

The invention will be better understood from ai484 * p the description below which gives a nonlimiting example of practical implementation and which is illustrated by the attached drawing in which
Figure 1 is a perspective view of the female organ.

 Figure 2 is a sectional view of the same member sealed in the masonry of a wall and in which is shown schematically the male member introduced and expanded.

 The female organ is constituted by a frustoconical tube 2, the large base 3 of which is welded to a plate 4 perpendicular to the axis of the tube 2. The assembly is embedded in the masonry 5 so that only the small base 6 appears flush with the facing 7.

 The ratio of the difference in diameters of the large base 3 and the small base 6 to the depth of the female organ. that is to say at the height of the cone, is of the order of 0.02. Thus it is common to adopt a height of 180 mm and to have external diameters of large base and small base respectively of 44 and 40 mm. The thickness of the frusto-conical tube 2 is generally 2mm.

 By the apparent opening of the small base 6, after extraction of the plug I2, a male organ 8 is introduced which has already been described in the first addition certificate NO 78.04992 of February 16, 1978. With the conicity of the female organ 1 such that has just been described, a better wedging of the expandable part 9, 10 of the male member 8 is obtained during an extraction attempt according to the arrow II. in fact, if a slight movement is made along said arrow cche li, the expandable part 9, 10 expands towards the internal sections of the frusto-conical tube 2 increasingly weak and the anchoring is accentuated.

 FIG. 2, moreover, shows that the same conicity of the tube 2 is opposed to the displacement of the latter, in the direction of the arrow 11. It is also easily understood how the plate 4 improves the anchoring in the deepest part of the masonry 5.

Claims (3)

 1. Anchoring device, as defined in claims 1 and 2 of the main patent, characterized by the fact that the female members (1) have a larger section in the bottom (3) than at the edge ( 6) and that their bottom is made integral with a plate (4) perpendicular to the axis of said female member.  2. Device as defined in claim 1, characterized in that the female member (1) has the shape of a hollow cone trunk with its large base fixed by a plate (4) larger than said large base.  3. Device, as defined in claim 2, c a r a c t é r i s ed by the rait that the ratio of the difference in the diameters of the bases of the cone to its height is of the order of 0, J2.