FRAME FOR DOOR OR WINDOW OPENING

Abstract: A frame (40) of profiles (2) of U-shaped cross-section is clamped at a wall rim (1) bounding an opening in a wall by means of a clam­ ping jaws (9,10). Said clamping jaws (9,10) are formed by a steel sheet bent over in its longitudinal direction and are profiled substan­ tially throughout their lengths, so that with a small thick­ ness of material the clamping jaws (9,10) mainly derive their rigidi­ ty from their profile.

Description: The invention relates to a frame as defined in the heading of claim 1. Such a frame is known from BE-A-890707. In this case the clamping jaws grip by their own spring force the bent-over rims of the frame profile. In the event of shocks and particularly of vibrations the frame may shift in place with respect to the wall. The connection is so weak that a large number of clamps distributed along the circumference of the frame is required. The invention provides such a strong clamp that by means of few clamps distributed along the circumference of the frame a firm connection of the frame with the wall can be ensured thanks to the characteristic feature defined in claim 1. Even the clamps themselves require little material because the clamping jaws can be made from thin steel sheet. This is preferably high quality steel. The above mentioned and further features of the invention are elucidated in the following description with reference to a drawing. The drawing schematically shows in Fig. 1 a cross-sectional view of a frame element embodying the invention mounted in a wall opening, Fig. 2 a plan view of a clamping device of the frame element of Fig.1, Fig. 3 an elevational view of a clamping jaw of the clamping device of Fig. 2 taken in the direction of the arrows III-III in Fig. 2, Fig. 4 an elevational view of a further clamping jaw of the clamping device of Fig. 2 taken in the direction of the arrows IV-IV in Fig. 2, Fig. 5 a detail of the clamping device of Fig. 2 illustrating the co-operation between the two clamping jaws, Fig. 6 an enlarged elevational view of the end part of a clamping jaw connected with a flange rim of the profile, Fig. 7 a sectional view taken on the line VII-VII in Fig. 6, Figs. 8 and 9 two different perspective views of the frame element shown in Fig. 7 in accordance with the invention, Fig. 10 an elevational view like Fig. 9, where a paumelle is arranged on the clamping device, Figs. 11 and 12 elevational views like Fig. 10 of different frame elements embodying the invention, and Figs. 13-16 each a sectional view on the line XV-XV and XVIII-XVIII respectively in Fig. 1. Fig. 1 shows a wall 1, on which is mounted a frame element 40, for example, a jamb or a lintel of a door, said frame element 40 comprising a profile 2 having a substantially U-shaped cross-section. The bottom 3 of the U constitutes the visible side of the profile 2, whereas the limbs of the U constitute flanges 4 and 5, whose rims 6 and 7 clamp a wall rim 1 in between them. The flange rims 6, 7 and the flanges 4, 5 are inwardly bent over and are transverse, preferably Perpendicular to the plane 32 of the wall. Inside the profile 2 is arranged a clamping device 8 having two co-operating clamping jaws 9 and 10. The two clamping jaws 9 and 10 each have a bent-over head rim 11 and 12 respectively, which are welded to the flange rim 6 and 7 respectively of the profile 2 in the factory, at least prior to mounting the frame element 40 to the wall rim 1. The clamping jaw 9 extends from the head rim 11 by a part 13 along the flange 4 and is prolonged by a part 14 extending in the direction to the bottom 3 of the profile 2, which art is followed by a part 15, which is substantially parallel to the part 13 and is prolonged in a part 16 extending substantially parallel to the bottom 3 of the profile. The clamping jaw 10 extends from the head rim 12 along substantially the whole flange 5 and has a countersunk portion 17 to which a nut 18 is fastened, for example, welded. Instead of using a nut 27 the clamping jaw 10 may have a tapped hole. The clamping jaw 9 has in the part 15 an opening 19, through which is passed a hollow screw 20, which is screwed into the pressed-in nut 18 and forms part of clamping means drawing the two clamping jaws 9 and 10 towards one another. The free end of the part 16 of the clamping jaw 9 is provided with a tag 21 which is substantially in line with the part 16 and which grips with a large amount of clearance into an opening 22 near the free end of the clamping jaw 10. Owing to said clearance the tag 21 is displaceable in the opening 22 in a direction transverse of the part 16, whilst the clamping jaws 9 and 10 are pivotable relatively to one another. The two clamping jaws 9 and 10 are each provided along their two side edges with stiffening ridges 23, 24 and 25, 25 respectively covering substantially the entire length. These stiffening ridges continue along the bent-over head rims 11 and 12 of the two clamping jaws 9 and 10 and have bulging parts 28 in these head rims 11 and 12 to serve as projections in projection welding for establishing the welding junction of these head rims with the associated flange rims 6 and 7 of the profile 2. Fig. 5 schematically shows a detail of the clamping device 8 illustrating the movabilities of the two clamping jaws 9 and 10 relative to one another. The position of the clamping jaws 9 and 10 indicated by solid lines is occupied when the hollow screw 20 is tightened. The clamping jaws 9 and 10 then turn towards one another about the head rim 33 of the part 16 engaging the clamping jaw 10. The two flanges 4 and 5 are then moved along by the two clamping jaws 9 and 10 and firmly urged with their flange rims 6 and 7 respectively against the side faces 32 of the wall rim 1 so that a satisfactory connection of the frame element 40 is obtained. Before the frame element 40 is mounted on the wall rim 1 the bolt 20 is loosely screwed into the nut 18 and the two clamping jaws 9 and 10 are relatively movable. If, for example, the wall rim is somewhat thicker the flanges 4 and 5 of the profile 2 must be pushed away one from the other to permit of sliding the profile 2 around the wall rim 1. During this deflection of the flanges 4 and 5 the clamping jaw 9 will perform a rotation about the area where the bolt 20 is passed through the opening 19 with an amount of clearance. The part 16 of the clamping jaw 9 will then move in the direction of the arrow R into the position indicated by solid lines. This movability of the clamping jaw 9 with respect to the clamping jaw 10 is limited by the opening 22 in which the tag 21 is engaged. The two clamping jaws 9 and 10 can thus readily move with respect to one another so that the frame element 40 can be arranged around the wall rim 1 with ample clearance and little deformation. The hollow screw can be readily moved through an opening 29 in a groove 34 of the profile 2, which opening can be closed by means of a rubber plug 30 or a synthetic resin cover. Figs. 6 and 7 show a frame element 40 embodying the invention which is particularly effective on smooth and/or shrinkable walls. The head rims 11, 12 of the two clamping jaws 9 and 10 are provided between the spaces 46 formed by the stiffening ridges 25 and 26 with an anchoring plate 31, which slightly projects in the mounted state out of the bent-over head rims 6, 7 of the flanges. The edges 47 of the anchoring plates 1 projecting beyond the head rims 6, 7 may be sharp or serrated. If desired, these anchoring plates 31 may be made from hard steel and be loosely slopped into said spaces so that in the mounted state they slightly penetrate into the wall rim 1 and thus additionally anchor the frame element 40. Between the two stiffening ridges 23 and 24 the part 14 of the clamping jaw 9 has fastened to it a nut 27. The nut 27 can be constituted by an element welded to a clamping jaw 9 or can be constituted by a part of the clamping jaw 9 having screw tapped hole. For the use illustrated in Figs. 8 and 9 the nut 27 is not utilized. Yet it is preferred to provide such a nut 27 in order to render the clamping device 8 universally usable, that is to say also for the purpose described hereinafter with reference to Fig. 10. The nut 27 constitutes a paumelle fastening means for fastening a wing 42 of a paumelle 43. A ridge 50 of the wing 42 of the hinge 43 is enclosed between the two stiffening ridges 23 and 24 and, owing to a slot 41 in the wing 42 of a paumelle 43 it can be adjustably fixed in place in the direction of length of these stiffening ridges by means of a hollow screw 45, which is accessible through a hole 48 in the profile 2 with the aid of a key adapted to the hollow head of the hollow screw 45. In this way the paumelle 43 is fastened to the rugged clamping device 8 clamping tightly to the wall rim 1 instead of being fastened to the relatively slack metal of the profile 2 so that the forces exerted on the paumelle 43 are transferred through the clamping device 8 to the wall rim 1, as a result of which the load on the profile 2 is reduced and the profile may, if desired, be made from thinner sheet material. The forces exerted on the paumelle 43 are transferred through the tag 21 and the bolt 20 of the clamping jaw 9 to the clamping jaw 10. The tag 21 ensures that the two clamping jaws 9 and 10 will invariably be in the correct relative positions. The hole 48 can be closed with a synthetic resin cover 49. The depressed ridge 50 in the middle of the wing 42 of the paumelle imparts rigidity to this wing 42. Moreover owing to the adaption of this ridge shape of the wing 42 to the gutter shape of the profile 2 of the part 14 of the clamping jaw 9 a firm interengagement of the paumelle 43 and clamping jaw 9 is ensured. The wing 42 of the paumelle 43 passes through a passage 51 recessed in the flange 4 and matching the section of the wing 42 which is assymmetrical to rotation. This means that the opening 51 permits only in one position of slipping in the wing 42 from the outside, in which position a cam 52 engages the groove 53 in the wing 42 on the side opposite the ridge 50. It is thus ensured that the paumelle 43 is invariably fastened in the required position to the clamping device 8, so that a door 53 can be directly and correctly suspended to the paumelle 43 by its hinges 54. Fig. 11 corresponds with Fig. 10, the difference being that the clamping jaws 60 and 61 are relatively displaceable telescopically by their part 62 and 63. A nut 64 is welded to the part 63 of the clamping jaw 61, whilst the hollow screw 20 is tightened therein to cause the two clamping jaws 60 and 61 to further approach one another when the clamping device 65 is being stretched. These clamping jaws 60 and 61 are made from curved, interengaging steel sheets forming bending-resistant elements. Fig. 12 is distinguished from Fig. 10 in that the head rims 91 of the clamping jaws 92 and 93 are not welded to the flange rims 84. Instead the flange rims 94 each have a bent-over rim 95, which is parallel to the surface 32 of the wall rim 1. When the clamping device 97 is stretched, the head rims 91 of the clamping jaws 92 and 93 clamp the bent-over rims 95 against the wall rim 1 so that the frame element 40 is tightly clamped to the wall rim 1. The sectional views XV to XVI show a profile of the clamping jaws 9 and 10 in which upright gutter sides 97 of a gutter profile 98 adjoin flanges 99 so that each clamping jaw 9, 10 derives its rigidity despite the small thickness of the material mainly from said gutter profile 98. The flanges 99 may have downwardly bent-over rims. The clamping jaws 9, 20 are preferably made from high-grade steel so that with a heavy stamping force they can just be bent and profiled. The proces of profiling with heavy stamping force increases highly the rigidity of the material so that the clamping jaws 9, 10 become very rigid. As an alternative, after their formation the clamping jaws may be subjected to a hardening process. The thickness d of the material of the clamping jaws 9, 10 is preferably less than 2 mms.

Claims: 1. A frame (40, 69, 85) comprising of a profile (2) of a substantially U-shaped cross-section, the flange rims (6, 7) of which can clamp in between them a wall rim (1) bounding an opening in a wall and at least one clamping device (8) engaging the flange rims (6, 7) by means of a first clamping jaw (9) and a second clamping jaw (10), said clamping jaws (9, 10) being so interconnected through first connection means that the free ends of said clamping jaws (9, 10) are relatively adjustable to each other, said clamping jaws (9, 10) being further interconnected through a clamping bolt (20) spaced from said first connection means, said clamping bolt (20) passing through an aperture (19), arranged in a part (15) of a first clamping jaw (9), said screw bolt (20) being actuatable through an opening (29) in a groove (34) of the profile (2), and said second clamping jaw (10) having a portion (17) provided with screw means (18), characterised in that each of the clamping jaws (9, 10) is formed from a steel sheet bent over in its longitudinal direction and being profiled substantially throughout its length in the form of a gutter profile (98) with flanges (99) adjoining the gutter sides (97) so that with a small thickness of material each clamping jaw (9, 10) mainly derives its rigidity from said gutter profile, and in that the second clamping jaw (10) has a countersunk portion (17) comprising said screw means (18) for engagement with said screw bolt (20).

Inventors: METZ, LAURENS
Applicants: POLYNORM N.V.
Application year: 1984
Main classification: E06B1
IPC codes: E05D5, E06B1, E05D7