Suspension hook

Abstract: Suspension hook (8), in particularly for suspending sectional bars (1) from an existing ceiling, said bars together forming a grid for supporting ceiling panels. Said bars each have an upper tubular part (5). The suspension hook consists of a connecting portion (9) and of a hook portion (12), said hook portion being intended to be inserted in said tubular part of the concerned sectional bar via a pair of apertures (6,7) in the upper wall of said tubular part. The hook portion has a flat bearing surface 15,16) which extends at about aright angle from the strip shaped connecting portion. The central region of said bearing surface is provided with a V-shaped downwardly projecting nose (13), the height of which corresponds with the height of the tubulat part of the concerned sectional bar. The free end of the hook portion is provided with an upwards directed lip (14).

Description: The present invention relates to an assembly of a suspension hook and a plurality of sectional bars forming a grid upon which ceiling panels are supported according to the preamble of claim 1. Such a suspension hook is known from EP-A-0 387 964, (fig. 5). The suspension hook of this type provides the advantage that the hook portion is inserted in the hollow tubular part in the lengthwise direction of the sectional bar, so that the hook portion forms no obstruction for the placing of the ceiling panels. Said known suspension hook has been punched out of sheet material in such a way that the hook portion and the connecting portion are both lying in a common plane defined by the main plane of said sheet material. The bearing surface of the hook portion is inherently defined by the thickness of the said sheet material. To allow accomodation of said hook portion, the tubular part of the sectional bar must have an oblong form in the vertical direction. The result is that the bearing surface of the known hook is rather small with consequently the risk of rupture of the upper wall of the tubular portion. Furthermore said known suspension hook can not be used in the nowadays available sectional bars in which the tubular part is only intended for increasing the rigidity of said sectional bars and in which the height of the tubular part is rather small. The object of the present invention is now to provide a suspension hook which easily can be accommodated in the hollow tubular part of a conventional sectional bar, said hook having enough strength for supporting the sectional bars without any risk for rupture of the upper wall of the tubular part of the sectional bars. These objects are achieved according to the invention by means of the features as disclosed in the characterizing portion of claim 1. Further efficient and advantageous features of the invention are disclosed in the subclaims. The invention is explained in greater detail with reference to the accompagnying drawings, in which:- Fig. 1 shows an isometric view of a commercial available sectional bar provided with apertures for accommodating a hook according to the invention; Fig. 2 shows a perspective view of a suspension hook according to the invention; Fig. 3 shows a vertical longitudinal section of the sectional bar, in which the suspension hook of figure 2 has been accommodated. Figure 1 shows a commercial available sectional bar 1, which in cross section has the shape of an inverted T. Said sectional bar consists of a vertical central body portion 2, which at the bottom end is provided with opposite projecting flanges 3 and 4 for supporting not shown ceiling panels. The body portion is at the free upper end provided with a hollow tubular part 5 for the stiffening of the sectional bar. Said tubular part has in the shown embodiment a rectangular cross section, and constitutes only a relatively small part of the whole body portion. In the upper wall of the tubular part a pair of apertures 6 and 7 are arranged for inserting a suspension hook 8 according to the invention which will be described hereafter with reference to figure 2. Said pairs of apertures are arranged at regular intervals along the length of each sectional bar. As will be seen from figure 2 the suspension hook is produced by bending a single strip of sheet metal and consists of a strip shaped connecting portion 9 which in the shown position at the top end has a face 10, which extend at a right angle from said connecting portion 9. Said face 10 comprises means for connecting the hook with a rod 11 which in turn is connected to an existing ceiling. Said means are already disclosed in the above mentionned European Patent Application 0387964 of Applicant and will here not be described. However it will be evident that other means could be used as well for connecting the connection portion of the hook to the rod 11. At the bottom end the strip shaped portion 9 merges in a tongue 12 which substantially extends at right angle from said strip shaped portion 9 and constitutes the actual hook portion. Said hook portion is destined to be inserted in the tubular part 5 of the sectional bar, and has a width that corresponds with the inner width of said tubular part 5. The tongue 12 has in its central portion a V-shaped depression, which constitutes a downwardly projecting nose 13. The free end of the tongue 12 is bend upwards for forming a small lip 14. In this way from the strip shaped portion 9 to the free end the tongue 12 contains a first bearing surface 15, the nose 13, a second bearing surface 16 and the lip 14. The mounting of the suspension hook according to the invention will now be explained with reference to figure 3. As clearly can be seen in figure 1, each pair of apertures in the upper side of the tubular part 5 of the sectional bar consists of a long aperture 7 and of a shorter aperture 6. The tongue 12 which constitutes the hook portion is inserted in the tubular part 5 via the longer aperture 7, during which the tip of the nose 13 abuts the inner bottom surface of the tubular part and the free end of the lip 14 abuts the inner upper surface of said tubular part. In this position the tongue 12 is slightly bend around the tip of the nose by its own flexibility so that the second bearing surface 16 is slightly rotated relative to the first bearing surface 15. From the above position the suspension hook is pushed further to the left in the figure until the lip 14 engages the shorter aperture 6. In this end position the bearing surfaces 15 and 16 are aligned again and abut the inner upper surface of the tubular part, whereas the tip of the nose still abuts the inner bottom surface of said tubular part. The flexibility of the tongue 12 allows the use of a relatively flat hook portion so that the suspension hook is suitable for sectional bars having a tubular part with a limited height. Both bearing surfaces 15 and 16 provide a correct abutment of the suspension hook against the inner upper surface of the tubular part 5 so avoiding any rupture of the upper wall of the tubular part of the sectional bar. The configuration of the tongue 12 together with its flexibility provides a kind of snap connection so that the suspension hook in the mounted position is securely maintained and it is possible to insert the suspension hooks in said sectional bars before mounting said sectional bars. The suspension hook according to the invention can easily be adapted to the different existing sectional bars by modifying the dimension of the nose. It should be understood that the invention is not limited to the embodiment as shown and described, but that within the scope of the invention many modifications are possible. The configuration of the nose 13 as well as the position thereof can be changed as desired. In the shown embodiment both bearing surfaces 15 and 16 extend at right angle with the strip shaped portion 9. Said angle could eventually be somewhat lesser than 90°. The strip shaped portion could be slightly curved instead of flat in order to make the hook somewhat resilient in the vertical direction so that the hook is more resistant for seismic impacts. The apertures 6 and 7 in the upper wall do not need to be as described but both apertures could be identical i.e. have the dimensions of the longer aperture 7. In this case the upper wall of said tubular part is in the lengthwise direction of the sectional bar provided with a series of equally spaced identical apertures. Finally the angle portion between the strip shaped portion 9 and the tongue could be reinforced by a reinforcement rib 17.

Claims: An assembly of a suspension hook and a plurality of sectional bars (1) forming a grid upon which ceiling panels are supported, each of said sectional bars comprising a vertical web portion (2) having an upper end and there being a hollow tubular part (5) on said upper end, said hollow tubular part having a top wall and there being a pair of apertures (6, 7) therein spaced along a length of said sectional bar, said suspension hook (8) consisting of a connecting portion (9, 10)) and of a hook portion (12) having a free end, the hook portion is inserted downwardly in said tubular part through a said aperture such that the free end of the hook portion extends upwardly through the second aperture characterized in that said connecting portion (9) comprising a flat strip having a top end and a bottom end, said bottom end comprising a portion bent at substantially a right angle to said flat strip to define the hook portion (12) having a flat bearing surface (15, 16) and there being an upwardly directed lip (14) at said free end, the central region of said bearing surface comprising a V-shaped depression forming a downwardly projecting nose (13) the height of which corresponds with the height of the tubular portion (5) of the sectional bar, the bearing surfaces (15,16) on either side of the nose (13) abut the inner upper surface of the tubular part and the tip of the nose abuts the inner bottom surface of said tubular part. An assembly according to claim 1 characterized in that the connecting portion (9,10) and the hook portion (12) are produced by bending a single strip of sheet metal. An assembly according to claim 1 or 2, characterized in that the angle portion where the connecting portion (9,10) merges in the hook portion (12) is provided with a reinforcement rib (17).

Inventors: KUIPER KAREL, KUIPER, KAREL
Applicants: KUIPER KAREL, KUIPER, KAREL
Application year: 1991
Main classification: E04B9
IPC codes: E04B9