TENSIONABLE WINDOW COVERING

Abstract: Window covering (1) at least provided with a first beam (3) connected to a window recess in addition to a second beam (4) and one or more cord members (2) tensioned therebetween for supporting and guiding a covering between the first and second beam, wherein at least one beam can be carried by means of a tensioning means from an active position, in which the or each cord (2) is tensioned, into a second position in which the cord (2) is slackened, and vice versa, whereby the window covering is easily removed in order for instance to clean the glass plate arranged in the window recess.

Description: TENSIONABLE WINDOW COVERING The invention relates to a window covering at least provided with a first beam connected to a window recess in addition to a second beam and one or more cord members tensioned therebetween for supporting and guiding a covering between the first and second beam. The window coverings as referred to in the present application can take different forms. The window covering can for instance be a pleated material or horizontally extending lamellar material. Such coverings are held in the plane between the beams by one or more tensioning cords so that the covering also remains tautly suspended in slanting windows, for instance skylights. Due to the relatively great tension on the tensioning cords it is difficult to remove the window covering in order for instance to clean- , the glass plates arranged in the window recess. The invention has for its object to obviate this drawback and provides for this purpose a window covering which is distinguished in that at least one beam can be carried by means of a tensioning means from an active position, in which the or each cord is tensioned, into a second position in which the cord is slackened, and vice versa. Owing to the additional tensioning means it is not only possible to easily release and remove the assembly consisting of window covering and beams from the window recess but also, after rearrangement, to rapidly reset the cords to the correct tension. In a preferred embodiment of the invention the ten¬ sioning means are formed by an eccentric mechanism arranged on the beam for tensioning. The two above mentioned posi- . tions are hereby ' quickly recognizable by the user. According to an embodiment of the invention the eccen¬ tric mechanism is assembled from an auxiliary beam which is fixed to the beam for tensioning and at least one end face of which is provided with a lever arm supporting rotatablv on the window recess. After arranging the other end, with or without the same eccentric mechanism, the auxiliarv beam and therewith the beam for tensioning can thus be placed at the correct tension position. In order to enable easy removal of the covering and the beams it is recommended to have the lever arm co-act with an anchor plate fastened against the window recess, which plate is provided with a hook-like recess in which the arm can be detachably and rotatably supported. The above proposed construction according to the invention also lends itself to arrangement of a second beam close to the other beam, this such that both auxiliary beams come to lie at a distance from the upper and lower limits of the window recess. This offers the advantage particularly in the case of windows with great light inci¬ dence that a ventilation gap is created at the top and bottom, whereby the temperature in the space between the window covering and the glass plate will not rise too high. Above mentioned and other features of the invention will be further elucidated in the figure description of an embodiment hereinbelow. In the drawing: figure 1 shows a perspective view of a window covering in the form of a pleated material, provided respectively with the tensioning and eccentric mechanism according to the invention; figure 2 shows a standing section of the window covering of figure 1; figure 3 is a perspective view corresponding with figure 1, but with the parts of the eccentric mechanism in exploded view; figure 4 is a perspective view on enlarged scale of the lever arm in the eccentric mechanism according to the invention. Designated in figure 1 with the numeral 1 is the pleated material which consists of a length of material folded in zig-zag form and respectively guided and sup- ported by tensioning cords 2. The tensioning cords are fastened into a first beam 3 on the top side of a window recess R and a second beam 4 on the bottom side thereo . It is noted that the window recess can have any random. configuration, and that in the embodiment shown it is the periphery of a window with glass plate G. The first and second beam 3 respectively 4 are formed in the embodiment shown from profile beams which are hollow and through which the tensioning cords can be threaded in a suitable manner and held at the desired tension by means of tensioning means (not shown) , for example a draw spring. It is noted (see figure 3) that a bottom beam 5 can be fixed to the pleated material 1 such that the beam 5 can be moved up and downward along the tensioning cords 2. Such a construction of a window covering is generally known for pleated material curtains and requires no further explana¬ tion. According to the invention at least the second beam 4 is fixed to an auxiliary beam 6 using the clamps 7 fixed thereon, which are substantially U-shaped and have inward facing flanges which fall into grooves 8 of second beam 4. The auxiliary beam 6 may further have any desired cross- section and has a length which is slightly smaller than the length of second beam 4. Each end face 10 of auxiliary beam 6 can be provided with a closing plate 11 which is embodied with a pin 12 which fits into the hollow space 13 of beam 6. The closing plate 11 has a height which is greater than that of auxiliary beam 6 and on the downward directed extension a pin-like protrusion 14 is fixed which points away from beam 6. A lever arm 15 is provided with a hole 16 that fits onto the pin 14 of closing plate 11. The lever arm is provided with a knob-like end portion 17 which can be held with the hand, which will be further elucidated below. Arranged on the end of the lever arm 15 situated opposite hole 16 is a pin 18 corresponding to the pin 14. An anchor plate 20 can be fastened against the sides of the window recess R by means of screws 21. The anchor plate 20 has a hook-like end portion 21, this such that the hook-like recess 22 can receive the pin 18. In assembled state the length of the auxiliary beam 6 with closing plate 11 and lever arm 15 is such that the pin 18 fits exactly into the recess 22 when the anchor plates 20 are fixedly screwed against the sides of window recess R. The above described eccentric mechanism consisting of the auxiliary beam 6 with associated accessories and anchor plate 20 operates as follows: Assuming that the first beam 3 is fixed in random manner against the window recess R, and starting from the situation in figure 1, the second beam 4 can easily be removed and the cords 2 slackened by releasing the eccen¬ tric mechanism with the auxiliary beam 6 from the window recess R. This takes place by moving the lever arm 15 on the underside away from the glass plate G (see figure 2) and rotating it upward according to arrow PI, wherein the lever arm 15 rotates around the pin 18 in recess 22. The pin 14 will describe a circular path relative to pin 18, whereby the distance between the beam 6 and the first beam 3 becomes smaller. Each cord 2 will hereby slacken and, in the slackened state, the pin 18 can be lifted from the recess 22 in the direction of the arrow P2, see figure 2. The underside of window covering 1 is thus released from the window recess R and can be folded upward, whereafter the glass plate G becomes accessible for operations not specified further. Tensioning the window covering takes place in reverse sequence, wherein the user can easily ascertain whether the correct end position, in which the cords 2 have the correct tension, has been reached by determining whether the lever arm 15 lies exactly adjacently of the anchor plate 20. In the embodiment shown it is possible to lock the lever arm 15 in the anchor plate 20, see figure 4. For this purpose the knob-like portion 17 is elongated on the side facing toward the anchor plate relative to the body plate of arm 15, which elongation 25 falls into an outwardly open chamber 26 of anchor plate 20. By turning the knob-like portion 17 away from the anchor plate 20 in the direction of arrow P3 , which is possible because of the relatively thin body plate of arm 15, the arm 15 can then be rotated away round the pin 18 in the manner described above. Con¬ versely, re-locking takes place by placing the protruding portion 25 back into the chamber 26. In the embodiment shown the first beam 3 is also fixed with clamping members 7 to a second auxiliary beam 6' . This auxiliary beam is likewise provided with closing plates 11, the pin 14 of which can fall into the recess 22 of an identically shaped anchor plate 20. In this upper part embodiment the lever arm 15 is omitted and the pin 14 has to be arranged directly into the recess 22. Detaching of the top beam 6' with the first beam 3 fixed thereto can take place by lifting the pin 14 out of the hook-like recess 22, see arrow P4 in figure 2. The invention is not limited to the above described embodiment. It is thus possible to dispense with the construction on the top at the first beam 3, wherein the first beam 3 is fixed directly against the top boundary of the window recess R. It is further possible to have the eccentric lever 15 point not downward, as shown, but upward in the tensioned position of the second beam 4 so that the second beam 4 with auxiliary beam 6 coupled thereto comes to lie directly against the bottom boundary of window recess R. The window recess R is hereby fully closed off by the covering. Finally, it is possible to arrange the lever arm 15 with closing plate 14 directly onto the second beam 2 without adversely affecting the action of the eccentric mechanism according to the invention. *****

Claims: CLAIMS 1. Window covering at least provided with a first beam connected to a window recess in addition to a second beam and one or more cord members tensioned therebetween for supporting and guiding a covering between the first and second beam, characterized in that at least one beam can be carried by means of a tensioning means from an active position, in which the or each cord is tensioned, into a second position in which the cord is slackened, and vice versa. 2. Window covering as claimed in claim 1, character¬ ized in that the tensioning means are formed by an eccen¬ tric mechanism arranged on the beam for tensioning. 3. Window covering as claimed in claim 1 and 2, char¬ acterized in that the eccentric mechanism is formed by an auxiliary beam which is fixed to the beam for tensioning and at least one end face of which is provided with a lever arm supporting rotatably on the window recess. 4. Window covering as claimed in claim 3 , character¬ ized in that the lever arm co-acts with an anchor plate fastened against the window recess and provided with a hook-like recess. 5. Window covering as claimed in claim 4, character¬ ized in that the lever arm is provided with a locking member which co-acts with a locking means on the anchor plate. 6. Window covering as claimed in any of the foregoing claims, characterized in that the other beam is provided with a second auxiliary beam accommodated releasably in the window recess . 7. Window covering as claimed in claim 5, character¬ ized in that the or each auxiliary beam is embodied with a closing plate along the head end thereof, which closing plate is provided with a pin for rotatably receiving the lever arm. *****

Inventors: SCHOEN SIEGFRIED JOACHIM, SCHOEN, SIEGFRIED, JOACHIM
Applicants: SCHOEN BV, SCHOEN B.V.
Application year: 1993
Main classification: E06B9
IPC codes: E06B9