Background Art It is well known to use hook means for mounting transverse members on a hollow mounting device, eg. in shelf systems wherein transverse member are used as sup- port for the individual shelves, the transverse members having hook means for en- gaging openings on bars mounted on a wall.

Description of the Invention The object of the invention is to provide a corner joint ensuring that the transverse member is stably retained in its engagement with the socket.

According to the invention, the corner joint further includes a post member adapted to be inserted into said socket in the first axial direction and having an abutment face so as to abut a portion of the hook means positioned opposite the free end of the hook means, and the socket may be secured to the post member by a fastening means.

As a result, the hook means remains engaged with the socket-even if the transverse member is subjected to pressure from below. This is due to the fact that abutment face of the post member is kept in firm abutment with the hook means and retained in said position, which is ensured by the post member being secured to the socket by a fastening means.

According to the invention the abutment face may be provided at the end of a slot for receiving the hook means. A particularly advantageous embodiment of the in- vention is thus obtained, ensuring an additional possibility of guiding the post mem- ber in relation to the socket during the joining process.

In a particularly preferred embodiment according to the invention the socket may be provided with at least one additional opening to allow passage of a fastening means.

According to the invention the fastening means may be a screw. It is thus obtained that the corner joint may be secured by means of a single screw, whereby a particu- lar simple construction is obtained.

The invention also relates to a bed comprising four corner posts and transverse members. This bed is characterised in that only comparative few separate fastening means are required to fasten the entire framework of the bed. As an example only four screws are needed, if fastening means in form of screws are used. Such a bed is easy to assemble and the assembled bed is able to resist pressure applied from be- low. This is especially important, if the invention is used for the construction of bunk beds, as it is possible to exert pressure on the lower face of the upper bunk from the bottom bunk.

Brief Description of the Drawings The invention is described in greater detail below with reference to the accompany- ing drawings, in which

Fig. 1 is a perspective view of a framed structure for a bed with four corner posts and four transverse members according to the invention, Fig. 2 shows portions of a corner joint in enlarged scale during the joining of a socket and a transverse member, Fig. 3 shows the socket and transverse members shown in Fig. 2 in mutual engage- ment and a post member to be inserted into said socket, Fig. 4 is an axial sectional view through a portion of the corner joint prior to the in- sertion of the post member, Fig. 5 is an axial sectional view through a portion of the corner joint after the inser- tion of the post member, Fig. 6 is a view from below of a post member.

Best Mode (s) for carrying out the invention Fig. 1 shows parts of a bed denoted by the general reference numeral 1 and formed of four corner posts 2,3, 4 and 5 and four transverse members 6,7, 8 and 9 forming part of a corner joint in each corner of the bed 1.

As apparent in Figs. 2-6, in each end each transverse member 6,7, 8 and 9 has three L-shaped hook means 12 adapted to engage a respective opening 11 in a socket 10.

The engagement is effected by inserting said hook means 12 into the opening 11 and subsequently displacing this downwardly in an axial direction in relation to the socket 10 (as indicated by arrows 22), whereby the free end 17 of the hook means 12 is urged into abutment with the inner face 19 of the socket. The hook means 12 are fittingly dimensioned to firmly abut the inner face 19 of the socket.

Subsequent to mounting of the transverse members 6,7, 8 and 9, an upper post member 13 is inserted downwardly into each socket 10. The post member 13 is pro- vided with a slot 14 adapted to receive at least the upper hook means 12. This slot 14 is defined by an end face 21 and two parallel lateral faces 23 and 24 (confer Fig. 6).

When the post member 13 has been completely inserted into the socket 10, the abutment face 21 of the slot 10 abuts a face 18 of the hook means 12 positioned op- posite the free end 17 of the hook means and the two parallel faces 23 and 24 each closely abuts a respective face of the hook means 12.

Each socket 10 is provided with an additional opening 15. A screw 16 is screwed into the post member 13 through the opening 15, whereby the socket 10 and the post member 13 are interlocked and it is ensured that the transverse members 6,7, 8 and 9 remain stably secured in their engagement with the individual sockets 10.

Each socket 10 is of course provided with openings for insertion of hook means 12 on both of the adjoining transverse members 6 and 7. The openings are arranged in pairs in a respective plane of two vertical planes which are perpendicular to each other. The post member 13 is correspondingly provided with two slots 14 and 21 be- ing in the same vertical planes as the above openings in their mounted state. As a re- sult, the slots 14 and 21 are adapted to receive the hook means 12 on both of the transverse members 6 and 7 thus allowing for construction of a rectangular framed structure by use of four corner posts 2,3, 4 and 5 and four transverse members 6,7, 8 and 9.

As shown in Fig. 1, in the opposite lower end of each socket 10 lower post members 25 have been inserted, said members 25 jointly forming the feet of the bed 1.

The invention has been described with reference to a preferred embodiment, but is not restricted thereto. As an example the corner joints may be used in a bunk bed in which the corner joints and the associated transverse members are used to form two superposed framed structures. Especially in this application it is vital that the socket

10 is secured to the post member 13, as pressure may be exerted from the bottom bunk to the lower face of the upper bunk. In this situation it is of course essential that the hook means 12 of the transverse members are prevented from disengaging the sockets 10.

It is also possible that the corner joint may be used in connection with framed struc- tures for safety scaffoldings.