Abstract:
A cold frame is formed with lateral wall elements containing transparent hollow chamber panels, and supports which are provided with lateral flanges. The lateral wall elements include lateral edge areas provided with through-passages and formed by the hollow chamber panels thereof, and rest against the flanges of the supports. The lateral wall elements are connected to the supports by clamping devices. The clamping devices include clamping elements which rest against the inner sides of the hollow cavity panels forming the edge areas of the lateral wall elements and are clamped between the hollow cavity panels and the tops of positioning bars belonging to the clamping devices. The bars protrude from the through-passages of the hollow chamber panels and they are rigidly connected to the flanges of the supports.

Description:
FIELD OF THE INVENTION 
     The invention relates to a cold frame, which has side wall elements that have highly transparent hollow chamber panels, and uprights that are provided with lateral flanges, in which the side wall elements have lateral edge regions that are formed by their hollow chamber panels, are provided with through holes, and abut against the flanges of the uprights. 
     PRIOR ART 
     EP 0 063 215 A2 discloses a frame-shaped container that is to be used as a cold frame. Here, the side walls, which are formed by highly transparent hollow chamber panels, are connected to the uprights by numerous pin-type connectors that on the one hand comprise individual parts that may be pushed loosely into one another and on the other pass through the through holes that lie one above the other and are provided in the edge regions of the hollow chamber panels and in the flanges of the uprights. When the container is assembled, the pin-type connectors are inserted into the through holes, which lie one above the other, in the hollow chamber panels and flanges and are thus put together from their individual parts. When the container is dismantled, the pin-type connectors are dismantled into their individual parts, and the side walls and the uprights are separated from one another. In so doing, care must be taken that none of the individual parts of the numerous pin-type connectors which have been dismantled into their individual parts is lost, so that when the container is later assembled a complete container can be produced. During storage of the dismantled container, the pin-type connectors that have been dismantled into their individual parts must be saved carefully so that when the container is assembled they are indeed actually available. It is disadvantageous that, in addition to the large number of individual parts of the numerous pin-type connectors of the container that have carefully to be kept safe, the pin-type connectors that are put together are slightly movable within themselves because of the play that is required for their individual parts to be pushed into one another, for which reason the side walls of the container are connected to the uprights somewhat unsteadily, a fact which becomes unpleasantly apparent when the cold frame is moved to another location in the garden. 
     SUMMARY OF THE INVENTION 
     It is the object of the invention to specify an improved cold frame. 
     This is achieved according to the invention with a cold frame of the type mentioned at the outset in that the side wall elements are provided with clamping devices, which connect the uprights and whereof the clamping elements abut against the inner sides of the hollow chamber panels forming the edge regions of the side wall elements and are clamped between the hollow chamber panels and the heads of positioning pins, which form part of the clamping devices, project out of the through holes in the hollow chamber panels, and are rigidly connected to the flanges of the uprights. 
     In the case of the cold frame according to the invention, the side wall elements are connected to the uprights by the clamping devices in a manner which is stable and yet readily releasable. The clamping elements of the clamping devices are clamped between the heads of the positioning pins and the hollow chamber panels, and by means of their outer sides they press the hollow chamber panels against the flanges of the uprights. In order to make stable connections, the clamping elements of the clamping devices are clamped between the heads of the positioning pins, which project out of the through holes in the hollow chamber panels, and the inner sides of the hollow chamber panels. To release the stable connections, the clamping elements of the clamping devices are withdrawn from between the heads of the positioning pins and the inner sides of the hollow chamber panels. The positioning pins, which are arranged in the through holes in the hollow chamber panels and project beyond the inner sides of the hollow chamber panels, are rigidly connected to the flanges of the uprights and cannot be lost during storage of the dismantled cold frame. 
     According to the invention, each clamping device may comprise a positioning pin, which is rigidly connected to a flange of an upright and whereof the head projects out of a through hole in a hollow chamber panel, and a clamping element, which is clamped between the head of the positioning pin and the inner side of the hollow chamber panel. 
     According to the invention, in the case of a clamping device which connects two side wall elements to an upright, a clamping element may be provided which abuts against the inner sides of the hollow chamber panels on both side wall elements and is clamped between the hollow chamber panels and the heads of positioning pins that project beyond the hollow chamber panels. This construction makes it possible to connect the two side wall elements stably by using an individual clamping element with the upright arranged between them. 
     According to a further feature of the invention, it may be provided, in the case of an upright that is arranged between two side wall elements, for a clamping device to be provided which connects the upright to both side wall elements and is provided with a clamping element that has two clamping limbs, which each abut against the inner side of the hollow chamber panel of a side wall element and are clamped between the hollow chamber panel and the head of a positioning pin that projects out of a through hole in the hollow chamber panel. 
     According to the invention, in the case of an upright having two flanges that are arranged at a right angle to one another, a clamping device may be provided which has a clamping element with two clamping limbs, which are arranged at a right angle to one another and are each clamped between a hollow chamber panel and the head of a positioning pin that projects out of a through hole in the hollow chamber panel. 
     Furthermore, it may be provided according to the invention for the positioning pins to project by means of flat webs beyond the inner sides of the hollow chamber panels, which abut against the flanges of the uprights, for the positioning pins to carry heads at their free ends, and for the clamping elements that abut against the inner sides of the hollow chamber panels to be clamped between the hollow chamber panels and the heads of the positioning pins. 
     According to the invention, the clamping elements may be provided with elongate slots in which the necks of the positioning pins, which are formed by the flat webs of the positioning pins, are received, and the clamping elements may be provided with clamping sections, which reach underneath the heads of the positioning pins. 
     The elongate slots of the clamping elements may be wedge-shaped, and wider at the open end than at the closed end. 
     According to the invention, the clamping elements that are provided with elongate slots may be slid onto the positioning pins that project beyond the inner sides of the hollow chamber panels, in a direction transverse in relation to the positioning pins, and thus be clampable between the hollow chamber panels and the heads of the positioning pins by means of their clamping sections. 
     According to the invention, the positioning pins may be made in one piece with the flanges of the uprights. The positioning pins may be integrally formed on the flanges of the uprights. 
     The invention will be explained in more detail below with reference to the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings: 
         FIG. 1  shows, diagrammatically, a cold frame from above, 
         FIG. 2  shows, diagrammatically, the inner side of a corner of the cold frame, 
         FIG. 3  shows part of an upright and a hollow chamber panel which is arranged next to it, 
         FIG. 4  shows part of an upright and a hollow chamber panel which is fixed thereto, 
         FIG. 5  shows a clamping element, and 
         FIG. 6  shows a corner of the cold frame from below. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       FIG. 1  shows a cold frame which has vertically arranged side wall elements  1  and vertical uprights  2 . The side wall elements  1  abut by means of their lateral edge regions  1   a  against the lateral flanges  2   a ,  2   b  of the uprights  2 . The side wall elements  1  are provided with highly transparent hollow chamber panels  3  which include, in the lateral edge regions  1   a  of the side wall elements  1 , two through holes  4  which are separated by a relatively large spacing. The flanges  2   a ,  2   b  of the uprights  2  carry positioning pins  5  which protrude at a right angle, which are arranged in the through holes  4  in the hollow chamber panels  3 , and whereof the heads  6  project beyond the hollow chamber panels  3 . Clamped between the heads  6  of the positioning pins  5  and the hollow chamber panels  3  of the side wall elements  1  are clamping elements  7  which press the hollow chamber panels  3  against the flanges  2   a ,  2   b  of the uprights  2 . The side wall elements  1  are connected stably to the uprights  2  by clamping devices which each comprise a positioning pin  5  and a clamping element  7 . The positioning pin  5  is rigidly connected to a flange  2   a ,  2   b  of an upright  2 , and its head  6  projects beyond the inner side of a hollow chamber panel  3 . The clamping element  7  abuts against the inner side of the hollow chamber panel  3  and is clamped between the latter and the head  6  of the positioning pin  5 . 
     From each of the two flanges  2   a ,  2   b  of the uprights  2  there protrude two positioning pins  5 , which are arranged at the same height and whereof the heads  6  each project beyond a hollow chamber panel  3  that abuts against the relevant flange  2   a ,  2   b . A common clamping element  7  is provided for the two positioning pins  5  that are arranged at the same height, and this has two clamping limbs  7   a ,  7   b , which are each associated with a flange  2   a ,  2   b  of the upright  2  and are clamped between the hollow chamber panel  3  that abuts against this flange  2   a ,  2   b  and the head  6  of the positioning pin  5  that projects beyond this hollow chamber panel  3 . 
     The positioning pins  6  each have three sections which succeed one another in the longitudinal direction of the positioning pins  5 : a base section  8  which protrudes at a right angle from the relevant flange  2   a ,  2   b  of the upright  2 ; a flat web  9  which adjoins the base section  8 —this web  9  forms the neck of the positioning pin  5 , which is provided with two lateral pinch points. The web  9  projects beyond the inner side of the hollow chamber panel  3  that abuts against the flange  2   a ,  2   b ; the head  6  of the positioning pin  5  adjoins the web  9 . The head  6  is arranged spaced above the inner side of the hollow chamber panel  3  and projects laterally beyond each of the two side faces of the flat web  9 . The clamping element  7  that is clamped between the head  6  of the positioning pin  5  and the hollow chamber panel  3  reaches underneath the head  6  of the positioning pin  5  by means of a clamping section that reaches almost to the flat web  9  of the positioning pin  5  and its side face. 
       FIG. 3  shows the upper half of an upright  2  having a first flange  2   a , which is shown as horizontal in the drawing, and a second flange  2   b , which is shown as upright in the drawing. For both flanges  2   a ,  2   b , a respective positioning pin  5  is provided, at the same height and protruding at a right angle from the flange  2   a ,  2   b . The two positioning pins  5  each have a base section  8  that adjoins the flange  2   a ,  2   b , a flat web  9  that adjoins the base section  8 , and a head  6  that adjoins the flat web  9 . Next to the first flange  2   a  there is shown a hollow chamber panel  3  of a side wall element  1 . In the lateral edge region  1   a  of the side wall element  1 , the hollow chamber panel  3  is provided with a through hole  4 . When the cold frame is assembled, the side wall element  1  is laid on the inner side of the first flange  2   a  by means of its lateral edge region  1   a . At the same time, the hollow chamber panel  3  is pushed over the positioning pin  5  of the first flange  2   a  by means of its through hole  4 . When the hollow chamber panel  3  lies on the first flange  2   a , the head  6  of the positioning pin  5  projects beyond the inner side of the hollow chamber panel  3 . 
       FIG. 4  shows the upper half of an upright  2  having a hollow chamber panel  3  that is clamped to the second flange  2   b , which is shown as upright in the drawing. The hollow chamber panel that is clamped to the first flange  2   a , which is shown as horizontal in the drawing, is not shown in  FIG. 4  for the sake of better clarity. 
     The hollow chamber panel  3  abuts against the front side of the flange  2   b . The positioning pin  5  of the second flange  2   b  projects through the through hole  4  of the hollow chamber panel  3 , beyond the inner side thereof. The base section  8  of the positioning pin  5  is completely inside the through hole  4  in the hollow chamber panel  3 . The flat web  9  of the positioning pin  5 , which adjoins the base section  8 , projects beyond the inner side of the hollow chamber panel  3 . The head of the positioning pin  5  is arranged just above the inner side of the hollow chamber panel  3 . Clamped between the inner side of the hollow chamber panel  3  and the head of the positioning pin  5  is a clamping limb  7   a  of the clamping element  7 . 
     The clamping element  7  has two clamping limbs  7   a ,  7   b , which are arranged at an angle to one another. They are each provided with an elongate slot  10 ,  11  that is laterally delimited by two clamping sections  12  and  13  respectively. The elongate slot  10 ,  11  receives the flat web  9  of a positioning pin  5  that protrudes from the respective flange  2   a ,  2   b . The clamping sections  12  and  13  that delimit the respective elongate slots  10  and  11  reach underneath the head  6  of the positioning pin  5 . The respective clamping sections  12  and  13  of the two clamping limbs  7   a ,  7   b  are each clamped between the head  6  of the positioning pin  5  and the hollow chamber panel  3  that is arranged at the underside of the clamping limb  7   a ,  7   b.    
       FIG. 5  shows an embodiment of the clamping element  7  having two clamping limbs  7   a ,  7   b  that are arranged at a right angle to one another and are each provided with an elongate slot  10  and  11  respectively. The two elongate slots  10 ,  11  are open at the lower edge of the clamping element  7 . The two elongate slots  10 ,  11  are wedge-shaped and are wider at the open, lower end than at the upper, closed end. The two clamping limbs  7   a ,  7   b  are connected at the upper edge of the clamping element  7  by a transverse wall  14 . 
       FIG. 6  shows a corner of the cold frame from below. The upright  2  has two flanges  2   a ,  2   b , which are arranged at a right angle to one another. From these, positioning pins  5  that are arranged at the same height protrude inward. The lateral edge region, which is formed by a hollow chamber panel  3   a ,  3   b , of a side wall element  1  abuts in each case against the respective inner side of the two flanges  2   a ,  2   b . The positioning pins  5  pass through a through hole  4  in the hollow chamber panels  3   a ,  3   b . The flat webs  9  of the positioning pins  5  project beyond the inner sides of the hollow chamber panels  3   a ,  3   b . Between the heads  6  of the positioning pins  5 , which are arranged at a spacing from the hollow chamber panels  3   a ,  3   b , and the hollow chamber panels  3   a ,  3   b  there are clamped the clamping limbs  7   a ,  7   b  of the clamping element  7 . 
     The positioning pins  5  are rigidly connected to the flanges  2   a ,  2   b  of the uprights  2 . The positioning pins  5  may be made in one piece with the flanges  2   a ,  2   b  or integrally formed thereon. Preferably, the upright  2 , with its two flanges  2   a ,  2   b  and the positioning pins  5  that protrude therefrom, is constructed as an injection molded part.