Abstract:
The design of sliding shutter boxes for sliding shutters on windows, door openings and the like requires in most cases the off site assembly of the entire mounting. Furthermore, such sliding shutter boxes are often very large and heavy and thus unnecessarily burden the building. The invention therefore provides to use a self-supporting housing of sheet-metal parts, which can be preassembled and can be installed on site together with the drum needed for rolling up the sliding shutter, the sliding shutter itself and other parts.

Description:
FIELD OF THE INVENTION 
     The invention relates to a mounting for a sliding shutter for windows or similar building openings, which sliding shutter can be wound onto a drum and consists of a plurality of horizontal segments, and more particularly a square-shaped sliding shutter box for mounting above a window and means for guiding and securing the sliding shutter unwound from the drum. 
     BACKGROUND OF THE INVENTION 
     Such sliding shutters are largely used for closing off window openings, doors of private and business establishments and the like. Conventional shutter boxes which receive the drum consist at least of several individual parts, which are assembled earlier off site and are adjusted at the site to fit the respective installation conditions. In particular, when buildings equipped with such sliding shutters are of a light-weight construction, at times significant problems arise during the installation of the sliding shutter box because of the applied loads related thereto. On the other hand, the usually provided guide for the unwound sliding shutter is often not sufficient to withstand the force of wind so that damage to the sliding shutter is unavoidable. 
     The purpose of the invention is therefore to design a mounting of the type identified in detail above such that the structural elements, on the one hand have a sufficiently high stability against elastic and plastic deformation, and on the other hand the entire shutter box construction, because of its low weight, puts very little load stress on the building equipped with same. 
     SUMMARY OF THE INVENTION 
     The purpose is attained according to the invention by providing a multi-part sliding shutter box housing mounted above a window or the like and means for guiding and securing a sliding shutter unrolled from a drum rotatably supported within the housing. 
     The housing is designed to be self-supporting and does not require any reinforcements so that the entire sliding shutter box can be premanufactured and can be installed in an assembled state on the window or a comparable building opening. This significantly reduces the installation costs. The inventive continuous reinforcements of the usually long strips of housing parts guarantee in spite of the relatively light construction a great stiffness of the sliding shutter box. Also, the accessibility of the inside of the sliding shutter box containing the drum and the conventional belt-driven drive roller is still guaranteed in a simple manner. Access to the inside of the shutter box is obtained by removing a corner cover piece. 
     The lateral guide means for the unwound sliding shutter is fastened in an economical manner together with a vertical portion of the window frame to a sidewall of the building defining the opening. This measure also contributes significantly to the permanent arrangement of the guide. The unwound, vertical flat sliding shutter panel is thus secured in a simple manner against bending by anchoring rods which can be installed when needed so that the panel cannot leave the lateral guide means. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be discussed in greater detail hereinafter in connection with one exemplary embodiment and the drawings, in which: 
     FIG. 1 is a partial perspective view taken from one end of a sliding shutter box according to the first embodiment of the present invention; 
     FIG. 2 is an enlarged cross sectional plan view of an end/portion of the shutter box illustrated in FIG. 4; 
     FIG. 3 is a partial top view of a window and window taken along the line 3--3 of FIG. 4; 
     FIG. 4 is a partial elevational view of the shutter box and window frame taken along the line 4--4 of FIG. 1; 
     FIG. 5 is a partial perspective view taken from one end of a sliding shutter box according to a second embodiment of the invention; and 
     FIG. 6 is an enlarged cross sectional plan view of a corner construction of the shutter box illustrated in FIG. 5. 
    
    
     DETAILED DESCRIPTION 
     A sliding shutter box 1 as shown FIGS. 1 and 2 consists of an elongate housing 2 for a drum 3, an exterior facing cover plate 4 and an interior facing protective plate 5. The drum 3 is provided on an axle 6, on which is also provided a belt roller 7 for a belt 8. Bearing points 11 for the axle 6 exist in each of two sheet- metal end parts 9 (one shown) on the sides of the housing 2, which end parts are covered by reinforcing plates 10 provided inside of the housing 2. Two segments of a sliding shutter 12, which are unwound from the drum 3, are indicated in FIG. 1. 
     The housing 2 consists of sheet-metal parts and includes an upper part 13 having an upper cover piece 14, an exterior cover piece 15 and an interior cover piece 16. The cover pieces 15 and 16 are angled downwardly from the upper cover piece 14 and end in continuous edges. An outwardly and upwardly directed L-shaped lower edge 17 of the exterior cover piece 15 is used to receive a lower portion of the cover plate 4 which is attached to the exterior piece 15. The upper cover piece 14 is reinforced with a bead 18 over its entire length, which bead extends into a gap 40 between a window head 19 (illustrated in outline form) and the upper cover piece 14. Bead 18 serves to reinforce the cover piece 14 and serves to seal off the gap 40 between the upper cover piece 14 and the window head 19. Since the housing 2 is not connected to the window head 19, the gap 40 can be created due to heat expansions and other movements of the building. The window head 19 can be designed in such a manner that the bead 18 engages a matching recess in an underside thereof. The interior cover piece 16 includes an inwardly directed flange 20 positioned approximately at half of the height of the housing 2, which flange 20 is covered by an outwardly directed flange 21 of a corner cover piece 22. The corner cover piece 22 consists of a vertical part 23, which has the flange 21, and a horizontal part 24. The corner cover piece 22 belongs to a divided lower part 25 which is complementary to the upper part 13 and has in addition, a horizontal frame piece 26. The end edges of the frame piece 26 and the upper part 13 are rigidly connected to each end part 9 in a manner which, in the installed state, does not permit a quick release of this connection. The corner cover piece 22 is arranged easily releasably from the upper part 13 and 13 and horizontal frame piece. The corner cover piece 22 is, in the area of the flanges 20 and 21, screwed to the interior cover piece 16, with the space defined between the flanges 20 and 21 being filled with a suitable material, for example a wood molding in order to simplify the screwed connection. The frame piece 26 includes an upwardly extending flange 27 formed in an exterior edge thereof to guide the unrolling sliding shutter 12, and a first guiding channel 28 formed in an interior edge of the frame piece 26 to receive an edge of the horizontal part 24 of the corner cover piece 22. 
     FIG. 1 also shows that the upper, horizontal part 29 of a window frame is fastened to the frame piece 26, when the housing 2 is oriented stationarily. Each of the end parts 9 are fastened to the window wall 30 with fastening means 43. According to FIG. 3, the vertical parts 41 of the window frame are fastened to a base plate 31 resting against the window wall 30, which base plate is furthermore provided integral with the vertical guide 32 of the sliding shutter 12. It can be recognized that the installation of the window frame together with the window 33 and integral support frame 33a is very simple, in particular when the base plate 31 is already premounted on the window frame vertical parts 41. 
     The frame piece 26 is spaced with its flange 27 from the exterior cover piece 15 so that a slot-shaped opening 34 results, through which pass both the guide 32 and the unrolled sliding shutter 12. 
     Coaxial recesses 35 are provided through a portion of the cover plate 4 and the window sill 39 (FIG. 4) of the window 33, into which recesses 35 anchoring rods 36 can be inserted. The anchoring rods 36 are used when the danger exists that the unrolled, flat sliding shutter 12 will bend so far under the force of wind that either the segments break or the sliding shutter is pressed out of the guide 32. It can happen under the force of wind that the sliding shutter is not only pressed inwardly but also outwardly. The anchoring rods 36 prevent a bending to the outside, just like the window prevents a bending to the inside. 
     A slightly modified embodiment is shown in FIGS. 5 and 6, in which the housing parts now consist of pieces so that complicated edge solutions can be created without any additional cost, which solutions enable a yet faster mounting and demounting. The already described parts, which have been taken over essentially unchanged from FIG. 1, have in FIGS. 5 and 6 the same reference numerals. 
     In contrast to the arrangement consisting of sheet-metal parts, the housing parts are now manufactured using an extrusion method. The interior cover piece 16 is thereby first provided at its lower end with a second guiding channel 20&#39;, into which a tab 21&#39; at the upper end of the corner cover piece 22 is inserted. The first and second guide channels 20&#39; and 28 are oriented in the same plane to facilitate removal and installation of the corner cover piece 22. The corner cover piece 22 can in this manner be easily removed and does not cause any damage even when the protective plate 5 and/or the other surroundings are plastered. 
     The upper cover piece 14 is releasably connected to the exterior cover piece 15. The cover plate 4 is held or elastically clamped to the exterior cover piece 15 by holding members 15a and 15b provided along the entire top and bottom edges of the exterior cover piece 15. The holding members 15a and 15b are reinforced over their entire length with reinforcing flanges 15a&#39; or 15b&#39;. 
     The exterior cover piece 15 and the upper cover piece 14 each include complementary hook-shaped flanges 14a and 15c along adjacent edges thereof. Both flanges 14a, 15c are constructed such that they can be placed hookingly into engagement with one another. Flanges 14a, 15c each form guiding grooves 14b, 15d into which the end tabs 14c 15e of the respective housing parts 14, 15 can be inserted. The flanges 14a, 15c are designed such that they can be easily separated from one another so that the cover plate 4 together with the exterior cover piece 15 can be easily removed. The construction suffices without any connecting elements. 
     The L-shaped edge 17, bead 18, flange 27, first and second guiding channels 20&#39;, 28, overlapping flanges 20, 21, holding members 15a, 15b, end tabs 14c 15e and the reinforcing flanges 15a&#39;, 15b&#39;, i.e. all beads, edges, and the like act reinforcingly to provide a great stiffness to the sliding shutter box. 
     Although a particular preferred embodiment of the invention has been disclosed in detail for illustrative purposes, it will be recognized that variations or modifications of the disclosed apparatus, including the rearrangement of parts, lie within the scope of the present invention.