A SPRING DEVICE FOR THE WINDING AND UNWINDING OF A FABRIC WOUND AROUND A SUPPORTING CYLINDER

Abstract: Enacting by a spring the raising and lowering of a guided screen in a combined movement: a drum (cup) cable to support the screen when it is winded or unwinded, a rigid and fixed implement at the terminals, fixed at the base, free of the screen; two lateral cables for the tension; two pairs of pulleys for the winding of the tension cables; two lateral guides for the rigid element to support the pair of pulleys and each one containing one of the two lateral tension cables for the pulley wires; a rigid pole that joins the two upper pulleys of the pair of pulleys along the inside of the cylinder which supports and holds the screw and a spring to control the tension inside the cylinder entwined with the pole and joined in the same cylinder at one of the ends and the other at the other end which spring exerts a twisting action necessary to hold to maintain the tension at the same time of the cable in whatever position the shade screen shall be.

Description: D E S C R I P T I O N "A spring device for the winding and unwinding of a fabric wound around a supporting cylinder" The present invention concerns a spring device for the winding and unwinding of a guided fabric wound around a supporting cylinder. In the field of a sunshade awning, awnings for shade; for mosquitoes 3nd similar others, it is important that the movement of the fabric that is used for an awning or small awning , mosquito screen or similar, works easily and without impedement or entanglement. While to obtain such a flawing movement, which can result easily for fabrics of certain dimensions or for a fabric that is rarely used, the same may not be said for fabrics of dimensions medium-large or even for fabrics the winding and consecutive unwinding rarefy or seldom happens. Various proposals have been advanced to resolve the problem in question in which there was the use of springs and mechanical systems but all these solutions are for the most part complecated and expensive and not always functionally satisfactory'. The present question proposal is to furnish a device simple and effective that makes functioning always easy and without obstacles even if it is used with fabrics of large dimensions suchas awnings thet can be used for sun on terraces, gardens or others. The invention proposes to resolve the problems cited furnishing a device having a few component parts of simple structure and not costh' in which the fabric finds itself firmly held (tension) for the flowing movement (easy) in the ascending phase and the descending phase. More precisely the spring device for the winding and unwinding guided by a fabric, object of our question in combination: a cable for support of the fabric upon which the fabric wraps around or winds and from which it unwinds: a rigid terminal element, fixed at the base free from the fabric, two cables for lateral tension, two pairs of springs for the winding of the tension cables, two lateral guides for the rigid element that supports the two pairs of pulleys each containing one of the two lateral cables lor teasion. a rigid pole that attaches ihe superior pulley lodged in the internal part of the cylinder cable for the support of the fabric, in the inside of the cylinder there is a spring agent for torsion that is threaded on the pole at point of attachment and is blended with the cylinder itself at one of the extremities and to one of the other pulleys at the other extremety. the spring mentioned excelling a torsion action necessary to maintain a tension together with the fabric and of the cables (tension) in whatever position the fabric is. The device will now be described in detail with reference of the designs, that is: Figure 1 - is a prospective view of the device with the fabric lowered with sectioned parts to show the inside; Figure 2 - is a similar view with the fabric partially raised: Figure 3 - is a frontal elevation with parts sectioned to show the internal part: Figure 4 - is a prospective view similar to those in Fig. 1 & 2 showing a form of accuation of double fabric with double device. As illustrated in the figures the device in question essentially includes a mobile fabric 10, a roller 11 for the winding of the fabric of cylinder cable, having grooves inside 12, two lateral guides 13 A, 13B each one constituted of a boxed element in quadrangular section, two pairs of pulleys each one supported by the lateral guide being indicated in refernce 14 A, 14B the two pulleys superior and with reference of 15A & 15B the two inferior pulleys, a mettalic pole 16 lodged inside of the roller cable 11. that attaches to the two superior pulleys 14 A. 14B that are solidly connected with the extremity of it; two cables ( lateral) 18 A, 18B each one gather in the lateral guides 13 A. 13B in a fashion to turn the enclosed pair of pulleys 14 A, 15A and 14B, 15B. supported internally by them ; a sleeve 20, provided by an external lock 21 threaded on the pole 16. on the inside of the roller 11 in a way that the lock 21, gather in its internal channel 12. a spiral spring 22, threaded also on the pole 16, having a solid or firm extrenity with the superior pulley, 14B the other extremity firm or solid with the sleeve 20 & a rigid element at the handle 23 fixed at the base of the free fabric 10. The rigid element of the handle 23 has a length slightly superior than the width of the fabric 10 in a way that its appendage 23 A, 23B stand out from them can be gathered (each one) in a vertical fissure 24A & B that it extends for the full length of the internal wall of the respective lateral guides 13Λ, 13B. At each extremity 23 A. 23B at the internal part of the relative lateral guide 13 A. 13B relative small cable is anchored 18A or 18B, in a way that the cylinder 11, pulleys 14A. 15A. 14B. 15B. cables 18A, 18B, the handle 23 and the fabric 10, constitute an interdependent complex that moves as one. Moreover, the complex of the roller that winds the fabric with the pulleys etc., is gathered completely in a boxed element superior 19 firmly with the lateral guides 13A & 13B the external walls supporting the two superior pulleys 14A and 14B. In functioning, whatever action exercised on the inferior handle 23 of the fabric for raising or for lowering, is transmitted from the lateral appendage 23 A -23B from it to the cables 18 A- 18B that cause a complete circle around the pulleys, having the extremities fixed to the appendages in apposite position. The structural disposition is such that the rotation of the pulleys determined by the action of the cables will have an apposite direction as the direcion of the roller 11 determined by fabric 10. In the example illustrated the raising of the fabric 10 from the position of Fig. 1 to that of Fig. 2 will make the roller 11. turn in a clockwise fashion and the pulleys 14 A and 14B in a counter clockwise direction, which would cause torsion spring 16. as already described and secured with the two extremities - from one part at the pulley 14B and from the other by means of the sleeve 20. with the lock 21 at the roller 11, through which the relative angular movements will have under the force of tension caused by the spring 22 that will charge and uncharge. depending on the rotaion related to the two pulleys and the roller. It will be noted with the joining or coupling by menas of the lock 21 and the channel 12 for the roller, allows spring 22 to shorten itself and lengthen itself on the pole 16, depending on its torsional movemnt. To this purpose il is well to mention that, although, on the illustrated form cables 18 A- 18B are made up of small chains round a spherical that attach on the pulleys 14 A. 14B with conduct, the cables will be made of variations of twine, cord, belts or similar. 90 In fig. 4 it is illustrated a form in varying including two fabrics 10 and 110, gathered around two rollers 11 and 111 distanced verticaUy on the lateral guide 113 A and 113B, pertaining to the two devices substantialh' identic to the one illustrated and described before. All the relative references and component parts necessary for the mounting of the 95 second fabric are increased by 100. In this variance the most notable difference is that the cables 118 A and 1118B cross each other at X, have the extremities anchered at the lateral appendages 23 A, 23B. 123 A, 123B of the two handles 23 and 123 gathered at the fissures or narrow passage of the guides themselves. 100 Evidently with the fabrics position it will be sufficient to activate one of the fabrics only. 10 or 110 in such direction to cause the movement of the other fabric in the inverse direction, practically lifting fabric 10 will lower the fabric in 110 and vice versa. The above shows how the invention resolves, in a satisfactory way. the problems 05 one may enconter in guiding, in its movements, a fabric that winds and unwindsfrom a cylindric support.

Claims: CLAIMS 1. A spring device for the guided winding and unwinding of a screen wrapped around a cylinder support that includes in combination: a cable roller for the support of the screen from which the screen winds and unwinds; a handle component rigid terminal, fixed at the base, free of the screen; two little tension cables: two pairs of pulleys for the winding of the tension cables; two lateral guides for the rigid element that support the pair of pulleys and that each contain one of the two lateral tension cables; a rigid pole, that connects the two upper pulleys of the pair, lodged inside the cylinder cable that supports the screen, this is characterized by the fact that inside this cylinder there is a spring agent for the torsion which is stringed on the connecting pole and is tied to the cylinder cable in order to rotate with it at one of its ends and at one of the pulleys so to rotate together at the other end, the spring practices a torsion action necessary to maintain the screen and cables together in tension in whatever position of the screen itself. 2. A spring device for the guided winding and unwinding of a screen in which the spring agent for torsion is connected to the cylinder cable, which is provided of an internal longitudinal groove by means of a sleeve threaded on the pole rigidly tied to the first end of the spring and which also has an external lock found in the groove, which garantees a combination that allows longitudinal movements at the extremity of the spring following its torsional movements. 3. A spring device for the guided winding and unwinding of a screen according to claim 2, supported by the upper extremity as well as the lower extremity of the lateral guides for the mounting of two screens that move together in opposite directions characterized by the fact that the extremities of the tension cable, which cross at X, are each anchored at one of the appendix of the sleeve that protrude on the inside of the guides through the openings. A device to raise and lower a shade screen guided and supported by a spring in a cylinder.

Inventors: SILVESTRI NICOLA, SILVESTRI, NICOLA
Applicants: SILVESTRI NICOLA, SILVESTRI, NICOLA
Application year: 1996
Main classification: E06B9
IPC codes: E06B9