VENTILATOR GRID

Abstract: A grid for arrangement in a rectangular or square opening being in communication with an air feed duct system, which grid is provided with parallel grid blades, wherein each blade is a strip-like profile (4) having means extending along the edges (7) for receiving a pin-like abutment (15) that is directed perpendicularly to a wall of a side profile (2) bounding the grid, said profile having position indi­ cations (9) where the abutment pins have to be placed, so allowing an easy assembling of grid in any desired dimension using relatively few different components.

Description: The invention relates to an inlet or outlet ventilation grid assembly for arrangement in a rectangular or square opening in communication with an air feed duct system, said grid assembly comprising a plurality of spaced apart, parallel louver blade profiles and a framework fitting in said opening, wherein each louver blade profile has means extending parallelly to the edges for receiving a pin-like abutment perpendicularly to the vertical wall of said framework. The air duct systems referred to in the preamble as disclosed in US-A-3,782,050 are mostly used for ventilation systems in buildings where the intake and outlet debouch into an outside wall of the relevant building. The usually rectangular or square openings in the outside wall have to be screened off by a grid. The making and fitting of such a grid assembly is relatively complicated because of the lack of standard dimensions so that it is scarcely or not possible to manufacture the grids in accordance with uniform dimensioning. The invention has for its object to obviate the above stated drawback and seeks to provide a grid which, in addition to having a construction of relatively few different components, is easy to assemble with regard to fitting. The grid according to the invention is distinguished in that said framework comprises four substantially L-shaped profiles having a curl of U-shaped cross-section along one side edge thereof, whereas connection at each of the four corners is carried out by a separate coupling member provided with two mutually perpendicular legs which are adapted to be fitted into the inside of said U-shaped curls. With this attachment system the framework profiles have only to be provided with pin-like members, either integrally cast or placed later, which fit into the recesses arranged in the continuous profile so that the blade profile can be sawn off at any desired length. For the effective connection of the framework profiles to each other the L-shaped corner coupling member, the legs of which fit into the U-shaped curl, is used. So the assembly is limited to insertion of the different elements into each other. In the case the abutment pins have to be placed later, for instance in the form of screw bolts, it is then recommended to provide the side profile with position indications where the abutment pins have to be placed. In accordance with a further feature of the invention the grid is provided with a wire mesh extending between the legs of the L-shaped edge profiles and situated adjacent to the grid blades. The wire mesh is hereby automatically enclosed between the edge profiles and the grid blades. The invention will be further elucidated with reference to the following figure description of an embodiment. In the drawing: Fig. 1 shows a perspective front view of an inlet and outlet grid according to the invention. Fig. 2 is a detail of the corner connection between two edge profiles of the grid from fig. 1. Fig. 3 is a perspective view of a part of a side profile with integrally arranged abutment pins for a grid blade as according to a second embodiment. The inlet or outlet grid shown in fig. 1 for an air duct consists substantially of a framework 1 built up of side profiles 2 and bottom and top profiles 3. Arranged between the side or edge profiles are a number of parallel grid blades 4 which have a strip-like shape and which display along the front and rear edges 5, 6 a receiving means 7, the function of which is further explained below. The edge profiles 2 are substantially L-shaped whereby the long leg 8, see fig. 2, is provided with a pattern of pressed-out portions 9 for receiving pin-like abutment means. The short leg 10 of the L-shaped edge profile serves to support a wire mesh 11 to be arranged between the grid blades 4 and that leg, see fig. 1. The other end portion of the L-shaped edge profile 2 is curled round into a U-shape, see 12, and this curled edge strip serves for fixing of the ends of the edge profiles sawn to length. Fixing is carried out by a separate L-shaped coupling member 13 provided with two mutually perpendicular legs 14 which can be received into the inside of the U-shaped edge strip 12 of the profile 2. Further fixing can take place in any suitable manner, for instance by spot welding and the like. The above mentioned pin-like abutments are formed in the embodiment according to fig. 1 by screw bolts 15 which can be placed through the pressed-out portions 9 into the hollow edge strip 7 of the grid blades 4. As a result of the predetermined pattern of pressed-out portions 9 the grid blades 4 are automatically arranged at an angle to the horizontal with respect to the edge profiles 2, such that raining-in and the like is avoided while air ventilation between the blades is still possible. It will be apparent from the above description that the manufacture of the present grid is very simple because the fitter only has to shorten the grid blades 4 to length, starting from a long strip of profile material 4. Depending on the size of the opening to be covered the edge profiles 2 and 3 are shortened to length, and the grid can be assembled. The grid blades 4 can be arranged between the edge strips 2 beforehand by means of the screw bolts 15 or later after the forming of the framework from the profiles 2 and 3. Fig. 3 shows an alternative embodiment whereby the pin-like abutment means are fixed beforehand to the edge profiles 2 so that the grid blade profiles 4 can be pushed onto them. The pins can be of random type and can for instance be welded, riveted, integrally cast etc. onto the outer wall of the edge strip 2. The profile strip 4 can be manufactured from plate material whereby the edge strips are curled, whereby a slightly resilient effect can be exerted on the pin-like abutments 15. Finally, it is noted that only a grid blade strip 4′ is lengthened on one side beyond the receiving means 7 in order to obtain a curling over edge 16 which curls out past the bottom edge strip 3. Different sectional profile shapes of the edge strips and profile blades are possible. It is nevertheless apparent from the above description that the number of parts of the grid is kept to a minimum.

Claims: Inlet or outlet ventilation grid assembly for arrangement in a rectangular or square opening and in communication with an air feed duct system, said grid assembly comprising a plurality of spaced apart, parallel louver blade profiles (4) and a framework fitting in said opening, wherein each louver blade profile has means extending parallelly to the edges (7) for receiving a pin-like abutment (15) perpendicularly to the vertical wall of said framework (1), characterized in that said framework (1) comprises four substantially L-shaped profiles (2, 3) having a curl (12) of U-shaped cross-section along one side edge thereof, whereas connection at each of the four corners is carried out by a separate coupling member (13) provided with two mutually perpendicular legs (14) which are adapted to be fitted into the inside of said U-shaped curls (12). Grid assembly as claimed in claim 1, characterized in that said profile (2) of the framework has position indications (9) for abutments (15) to be mounted later. Grid assembly as claimed in claim 1 or 2, characterized in that a wire mesh (11) is arranged adjacent to the louver blades (4) and extending between the L-shaped profiles (2) of the framework (1). Grid assembly as claimed in any of the foregoing claims, characterized in that the bottom grid blade has an edge strip (16) curling out beyond said receiving means extending in lengthwise direction.

Inventors: DE WAAL, CASPARUS WILHELMUS
Applicants: DE WAAL, CASPARUS WILHELMUS
Application year: 1989
Main classification: F24F13
IPC codes: F24F13