EP0220742A2 - Overhead door counterbalanced by a tension coil spring, having a safety element passing through it - Google Patents

Abstract

The overhead door has a counter balancing device by use of helical tension springs arranged between a lateral spar of the frame and a pivoting lever which is itself mounted rotatably on the frame and articulated on the door leaf which is moreover mounted displaceably in horizontal guide rails via rollers. To provide protection against spring parts which are flung off when a spring breaks, one-part or two-part protective elements pass through these springs, specifically in such a way as to ensure a positive connection of the protective element.

Description

The invention relates to a protective element for preventing damage in the event of breakage of a counterbalance tension spring of an overhead door with the features of the preamble of claim 1.

These helical springs, which serve to balance the weight of the moving door leaf in a known manner, have the effect that the door leaf can be moved with as little force as possible over the entire movement distance between its closed position and its open position.

For this purpose, the coil tension springs are stretched over the handlebars guiding the door leaf in the course of the movement of the door leaf from the open to the closed position over a relatively small path and are strongly preloaded. If such a tension spring breaks, which can happen primarily under its maximum expansion load, the spring parts hit their mounts with very considerable energy due to the sudden release of the large force stored in the spring and move uncontrollably outside the normal spring travel. This creates a significant risk of injury and damage. Such large deformations can occur on the door structure that restoration is not possible only by exchanging the tension springs and, if applicable, their immediate holding parts. Since the springs of the type in question are generally only hooked with their connecting ends into engagement with the respectively adjacent door parts, there is a risk that end parts of the spring will come loose from their anchoring and - like middle fragments if the spring is broken more than once - can be thrown out of control uncontrolled.

In addition to proposals to envelop such a pretensioned helical tension spring with an outer shell, for example a two-part telescopic tube, it is already known to guide a correspondingly elongated protective element through the interior of the spring surrounded by the spring coils, on which the spring parts which are created are caught in the event of spring breakage, so that they cannot swing away destructively or be flung away. A known protective element of this type - DE-AS 29 23 327 - consists of two parts which are longitudinally displaceable to one another in order to be able to follow the spring travel in the course of the change in the operating length of the spring. The lower, attached to the side frame spring connection end associated with the end of the protective element is also fixed to the spring-holding spring hook and can have a rod-like character, while the upper connection end of the spring arranged second part of the protective element is designed as a band that an intermediate element in the form of a spring holding band having a number of elongated holes is fixed in one of the elongated holes. Due to the band structure or its definition in one of the elongated holes of the spring retaining band and the orientation of the hook-shaped spring connection end, which is also suspended in one of the elongated holes, the band-shaped part of the protective element is fastened in an elongated hole that lies below the suspension elongated hole of the spring . This makes it possible, however, that if the spring breaks, the upper part detaches from the intermediate member by sliding the hook-shaped connecting end of the spring and thus moves away from its holder. In addition, this known protective element places particular value on the fact that in the event of spring breakage and corresponding lateral impact stress on the protective element in a deliberately predetermined zone of the band-shaped part, a change in the shape of the band takes place, the corresponding deformation work requires, whereby the impact energy of the broken spring acting on the band is reduced accordingly.

A known weight compensation coil spring device of the type mentioned with hook ends bent from the spring wire in a hook-shaped manner - DE-GM 81 35 815 - is provided with a protective element arranged in a manner encompassing the interior of the spring coils, comprising a one-piece, resilient rod projecting beyond the upwardly directed spring end , the projecting end of which is guided so as to be longitudinally displaceable in the area of the connection between the helical tension spring and the pivoting lever. This leadership of the upper rod end can be done simply by taking in the frame formed by the bearing block, the two parallel short lever arms and the connecting member located between their free ends or by a special guide opening which is formed on the connecting member and which projects upwards End portion of the rod slidably receives. In addition, it is mentioned that the end of the rod protruding from the upper end of the spring at maximum spring elongation can be bent back over the connecting element on which the upper connecting end of the spring is held, the sliding guide of the rod then being intended to be formed by its bent back end.

In any case, it is only a question of the magnitude of the tensile force directed into the interior of the spring or of a stability against deformation of the rod, to what extent the rod remains with the upper end in the guide, however formed. It should be noted that a spring break is to be feared primarily when the spring is stretched to the maximum, ie if the upper end of the rod protrudes only slightly from the spring. If you choose this end long, it protrudes speaking far out of its sliding guide upwards and describes a disturbingly large arc when the door leaf moves.

At its lower end, the rod is bent at a right angle and inserted into a hole in the spring hook holding the lower connection end of the spring and held in this spatial position by a type of union lock. Here, too, it is a question of the magnitude of the tensile or dimensional stability of this bend, whether the protective element can fulfill its task or not.

Since very high impact stresses occur during breaking, which are predetermined by the spring or its task, this known design of the protective element requires a particular dimensional stability in order to prevent the rod from being pulled out of its upper guide or its lower holder and thus parts the broken spring will be released. A correspondingly stable rod made of spring steel according to the known proposal may do this task, but it is relatively complex and must ensure with appropriate security that its bends provided in the area of the holder or guide can withstand the greatest possible tensile load when the spring is tensioned.

The invention has for its object to provide a backup for a weight compensation coil tension spring overhead doors of the type in question, the protective element with a minimum amount of material according to quantity and quality offers maximum security.

Starting from the subject matter of the preamble of claim 1, this object is achieved according to the invention by its characterizing features.

The protective element designed according to the invention is loop-shaped, so that there are no straight or curved end regions that could be pulled out of the holder on the connecting element or on the intermediate element or a holding element or holding element attached to it by deformation. In the direction of this tensile load occurring when the spring breaks, there is a form-fit between the loop-shaped protective element and the respective point of attack above the upper end of the spring, which means that the holder can only be lost by destroying the tensile element.

The fixing of the lower end region of the protective element to the spring hook is also fundamentally positive, whereby the shape of a loop or the shape of two eyelets can be provided, which are formed in the lower end region of the longitudinal longitudinal webs which are separated from one another in this case.

The protective element according to the invention can consist of a loop which extends through the entire length of the spring, from the spring hook holding the lower connection end of the spring to beyond the upper connection end of the spring. In this one-piece loop version, the holder of the protective element must be designed to be longitudinally displaceable in order to take account of the change in length of the spring during operation. In any case, however, the retaining design is designed in such a way that the loop shape there changes into a form-fitting attack on the respective holder when tensile load is applied downwards, be it the connecting link or a retaining link which is attached to the intermediate link, which is designed in particular as an elongated hole band the link extends to the upper terminal end of the spring.

The protective element designed according to the invention can also consist of several, above all two, loop parts which extend through one another in the manner of particularly elongated chain links. In this case, no longitudinal displacement guidance of the upper loop part is required in its holding area, because the change in length of the spring within the door operation is taken into account by the longitudinal displaceability of the loop parts with respect to one another. The upper loop part can include the connecting link with its retaining design, but it can also be guided through an elongated hole opening of the intermediate link above the hooking of the hook-shaped upper connecting end of the spring or else can be fixed to the intermediate link by a special retaining link. The lower loop can in turn be loop-shaped in its lower connection area on the spring hooks or fixed with eyelets formed on the freely running leg webs, as was already mentioned above in connection with the one-piece design of the protective element.

The protective element can only be attached in its one-piece form, or also from two or more loop parts, consisting of a closed loop shape, even if the spring has already been installed; this also applies, of course, to retrofitting. The lower end region of the protective element - be it in the form of a loop or through eyelets formed on the ends of the loop webs - is lifted away from the frame by slightly bending the spring hook from its one-sided resilient contact, so that the loop shape or the eyelets fall into the area of the fixing design of the spring hook can get, which also receives the lower hook-shaped connection end of the spring. In one piece, a longitudinally ver sliding definition of the training in the upper area of the loop on the intermediate link. The above applies to training with a lower and an upper loop, with the difference that the upper loop is fixed to the intermediate link via a holding part.

In a different design, however, a loop shape can also be selected that is open for assembly purposes. This comes into consideration, for example, if the one-piece protective element is to be arranged around the connecting member between the short lever arms of the pivot lever. This applies in the same way to the upper loop part of a multi-part protective element. Such an upper loop part can also be inserted into one of the elongated holes of the intermediate part in such a divided design. Insofar as the protective element is assembled in the factory or under similar conditions, the loop which is initially produced open can be closed after assembly, for example by welding. If the protective element is only attached after the spring has been fitted, this also in the case of retrofitting, a two-part loop design - be it in one-piece or multi-part design of the protective element - can be joined together to form a closed loop shape by a locking part. This closing part is to be designed with a positive fit at least in the longitudinal direction of the train, for example by means of a bolt-shaped connecting element penetrating through the two eyelets to be joined at the loop web ends.
It should be particularly emphasized that the protective element according to the invention is basically held in its upper end region, that is to say with its retaining design, above the particularly hook-shaped upper connection end of the spring. This protects the entire spring where whatever it breaks The protective element is held only on parts on which the upper connection end of the spring is also suspended. So if you design these parts - the connecting link or the intermediate link or on this fixed retaining formations as well as the lower spring hook to be fixed on the frame side frame - accordingly against breakage, then any spring part that arises when the spring breaks can be safely protected with the help of the protective element Spin off are kept.

The protective element according to the invention consists of simple wire, the dimensions of which depend on its tensile strength. It should be borne in mind that even very thin wire responds in a durable manner, particularly to sudden tensile loads. This is also due to its plastic deformability, which also absorbs the impact energy of the breaking spring. Such a wire is relatively thin and cheap, since there are no special requirements for its quality.

Further refinements of the invention result from the subclaims, in connection with the exemplary embodiments shown in the drawing, to which particular reference is made and the subsequent description of which explains the invention in more detail.

• Figuren 1 und 2 Teilansichten auf einen Seitenzargenbereich eines schematisch wiedergegebenen Einblatt-­Überkopftores mit gesicherter Gewichtsaus­gleichs-Schraubenzugfedereinrichtung, und zwar bei etwa geschlossenem Torblatt auf dessen Innenseite und in fast geschlosse­nem Zustand auf den Seitenbereich des Tores gesehen, wobei ein Ausführungsbeispiel eines aus zwei längsverschieblich ineinandergreifen­den Schlaufenteilen gebildeten Schutzele­mentes im Bereich seiner Halteausbildung an anderer Stelle an dem Zwischenglied festgelegt ist als das obere Anschluß­ende der Feder;
• Figuren 3 und 4 schematische Teilansichten entsprechend de­nen der Figuren 1 und 2, bei denen die räumliche Zuordnung des oberen Anschluß­endes der Feder zu der Halteausbildung des Schutzelementes anders getroffen ist;
• Figuren 5 bis 7 verschiedene Ansichten des Ausführungsbei­spieles nach den Figuren 3 und 4 in ver­größerter, in der Länge reduzierter Dar­stellung zur Erläuterung von Einzelheiten;
• Figur 8 drei verschiedene Ausgestaltungen eines aus zwei längsverschieblich ineinandergreifen­den Schlaufenteilen gebildeten Schutzele­mentes;
• Figuren 9 u. 10 Draufsicht und Seitenansicht auf einen stark vergrößert wiedergegebenen Teilbe­reich des Zwischengliedes mit an diesem ge­haltenen Schlaufenteil;
• Figuren 11 u. 12 Draufsicht und Seitenansicht eines stark vergrößerten Teilbereiches auf das Zwischen­glied mit einer anderen Halterung des obe­ren Schlaufenteiles;
• Figur 13 eine in der Länge stark reduzierte Prinzip-­Darstellung einer Gewichtsausgleichs-Schrau­benzugfedereinrichtung mit einem Ausführungs­beispiel eines einstückig ausgebildeten Schutzelementes;
• Figur 14 drei verschiedene Ausbildungen eines ein­stückigen Schutzelementes;
• Figuren 15 - 17 Draufsicht, Seitenansicht und Schnittansicht eines stark vergrößerten Abschnittes mit an diesem längsverschieblich geführtem Schutz­element.

Show it

• Figures 1 and 2 partial views of a side frame area of a schematically reproduced single-leaf overhead door with secured weight compensation screw tension device, namely with the door leaf approximately closed on the inside and in an almost closed state on the side area of the door seen, wherein an embodiment of a protective element formed from two longitudinally interlocking loop parts is fixed in the region of its retaining formation at a different location on the intermediate member than the upper connection end of the spring;
• Figures 3 and 4 are schematic partial views corresponding to those of Figures 1 and 2, in which the spatial assignment of the upper terminal end of the spring to the retaining design of the protective element is made differently;
• Figures 5 to 7 different views of the embodiment of Figures 3 and 4 in an enlarged, reduced in length to explain details;
• Figure 8 shows three different configurations of a protective element formed from two longitudinally interlocking loop parts;
• Figures 9 u. 10 top view and side view of a greatly enlarged partial area of the intermediate link with the loop part held thereon;
• Figures 11 u. 12 top view and side view of a greatly enlarged partial area of the intermediate link with another holder of the upper loop part;
• FIG. 13 shows a schematic representation of a weight compensation helical tension spring device with an embodiment of a one-piece protective element, greatly reduced in length;
• FIG. 14 three different designs of a one-piece protective element;
• Figures 15-17 top view, side view and sectional view of a greatly enlarged section with a longitudinally displaceably guided protective element.

The partial views according to FIGS. 1 to 4 show a schematically reproduced single-leaf overhead door, designated overall by 1, in the indicated state of installation. A frame 3 is assigned to the door leaf 2, which is moveably guided over the head and is mounted in a known manner in the edge region of the wall opening to be closed by the door. Of the two side rails arranged vertically, only one side frame 4 is shown, approximately in the middle area of which a two-armed pivot lever 5 is held by means of a bearing block 6, and can be pivoted in a plane that runs perpendicular to the door leaf plane. The two-armed swivel lever has a short lever arm 7, which is assigned a correspondingly short second lever arm 18 running parallel. At the free end of the other, long lever arm 9 of the pivot lever 5, the lower inner edge region is articulated the door leaf 2, which is provided in its upper inner edge region with rollers 10 which can roll in guide rails 11. The Guide rails 11 extend from the frame frame 3 horizontally into the space to be locked.

The two short parallel lever arms 7 and 8 are connected via the axis of the bearing block 6 on the one hand and with regard to their free ends with the aid of a connecting member 12 to form a rigid frame structure. When the door leaf 2 is transferred from its closed position to its open position close to the ceiling, the short lever arms 7 and 8 move with respect to their free ends or the connecting member 12 from an upward position into one which is directed downward toward the floor, whereby an approximately semicircular arc is traversed, which is arched into the interior of the room to be locked. Correspondingly the other way round, the free end of the long lever arm 9 moves in the course of this transfer of the door leaf 2 from a position directed towards the floor into one in which it supports the lower edge of the door leaf 2 in its horizontal opening position upwards .

The path of the connecting member 12 thus describes the path of the lower edge region of the door leaf 2 in a shortened section shape and transmits this path-dependent position via an intermediate member 13 to a coil tension spring 14 which, with the intermediate member designed as a spring retaining strap, is bent over its upper part, which is then bent onto the screw spiral hook-shaped connection end 15 is connected. The helical spring coil is bent in a hook-shaped manner at the lower end of the spring 14 in a corresponding manner to a lower connection end 16 which engages a spring hook 17 which is fastened in the lower region of the side frame 4. As is readily understood from these statements and is also known from this type of door, the spring is in the closed position due to its connection to the connecting member 12 of the door leaf extended to its greatest operating length, while it increasingly contracts under the pretension given to it when the door leaf 2 is moved into the open position and finally assumes its smallest operating length when the door leaf 2 is in its open position. In order to actually keep the short lever arms 7 and 8 short and thus to be able to keep their path into the space to be locked small and still compensate for the door leaf weight by the tensile force of the spring, this has only a relatively small change in operating length and is strongly preloaded. An adjustment of this pretension or adaptation to the weight of the door leaf 2 is possible in that the intermediate member designed as a spring retaining band has a series of openings arranged successively in its longitudinal direction and elongated in this direction, the lower one here with 19 and the top one with 20 is designated. The hook-shaped upper connection end 15 of the spring 14 can optionally be used in one of these series of openings in which the correct pretension is given. Gates of this type are known and work perfectly.

The spring 14 is penetrated by a protective element, designated as a whole by 18, which consists of two loop parts 22 and 23 which extend through one another in the manner of particularly elongated chain links and are accordingly longitudinally displaceable relative to one another. The two loop parts 22 and 23 pass through the space encompassed by the helix or the helical paths of the helical spring 14. The lower end of the loop part 23 assigned to the lower hook-shaped connection end 16 of the spring 14 is held together with this connection end 16 of the spring 14 on the spring hook 17, while that of the upper hook-shaped connection end 15 the upper loop part 22 assigned to the spring 14 is fixed with its arcuate upper end serving as a retaining formation in the region of the uppermost elongated hole opening 20 of the intermediate member 13. Different types of this determination will be explained later.

In the example according to FIGS. 1 and 2, the spring 14 is hooked with its upper connection end 15 into the lowermost slot opening 19, that is, when viewed upwards, it is far overhanged by the upper end or the holding design 26 of the upper holding part 22. This ensures that the spring 14 can be lifted out of the slot opening 19 for the purpose of adjustment or re-tensioning and hooked into one of the slot openings above it, while the loop parts 22 and 23 of the protective element 18 are dimensioned in this way by their upper and lower fixing are that they are pulled apart to their maximum overall length when the gate is closed and thus the greatest spring tension and the highest probability of a spring break. If the spring breaks now, the spring fragments are caught without being able to make an excessive lateral movement. If the spring breaks in a less tensioned state, the energy is also smaller, so that the flexibility of the tensioning element 18 is less and less important due to the correspondingly widely shifted loop parts.

The conditions shown in Figures 3 and 4 show a tensioned spring, the hook-shaped upper connection end 15 also engages in the slot opening 20. This would accordingly be the final state reached with regard to the life of the spring, the initial operating state of which is shown in FIGS. 1 and 2.

The common use of an elongated hole opening for holding the protective element on the one hand and hanging the the upper connection end 15 of the spring 14, on the other hand, is such that the connection end 15 of the spring 14 engages directly on the lower edge of the slot opening lying in the pulling direction, while the protective element 18 is held in the free area of this slot opening above it, be it in the form of the passage of the loop itself through this free space of the elongated hole, be it through a bolt of a holding part, as will be described later. Such a procedure has the advantage that the freedom of movement of the connection end 15 of the spring 14 is limited when it breaks in the direction of unhooking. It cannot be ruled out that the spring breaks in the area of the transition between the connection end 15 and the first closed screw turn of the spring. In this case, the spinning off of the connection end 15 by exiting from the hanging opening is to be prevented. Of course, this can also be achieved with an arrangement according to FIGS. 1 and 2 by closing the space of the elongated hole opening 19 above the connection end 15 with a screw, and accordingly restricting the freedom of movement of the hook-shaped connection end 15 accordingly. Of course, this also applies when the spring is hooked into other elongated hole openings, and one can also insert the holding formation 26 of the upper holding part 22 together with the connecting end 15 of the spring 14 into a lower-lying elongated hole opening, in order thus to achieve the described prevention of the movement unit .

FIGS. 5 to 7 show enlarged, on the other hand reduced with regard to the longitudinal directions of the arms, springs and loop parts, again a side frame region with the measures provided for the weight compensation tension spring arrangement and its securing. Here you can see in particular that the Upper, arcuate transition between the loop legs 24 and 25 of the upper loop part 22 is above the upper connection end 15 of the tension spring 14 suspended in the same slot opening 20. In connection with FIGS. 11 and 12 this will be discussed again.

5 to 7 show in particular the design of the spring hook 7, on which the hook-shaped lower connecting end 16 of the spring 14 and the arcuate transition between the loop webs 24 and 25 of the lower loop part 23 are held in parallel. This bracket takes place in a downwardly open, approximately U-shaped recess, which forms a fixing formation 38 together for the lower spring connection 16 and the lower closed arcuate transition of the lower loop part 23. Towards the outside of the frame, an angular region 39 adjoins the fixing formation 38, the side region facing away from the formation 38 is fixed to the side frame 4 by welding or the like. In the other side area of the fixing formation 38 there is a downwardly projecting section 40, on which a support tab 41 is bent towards the side frame. This support tab 41 abuts a door leaf cover strip 42 fixed to the frame, so that the spring hook 17 can be pulled off the cover strip 42 so elastically by attacking approximately in section 40 that the end of the support tab 41 comes free and a gap is formed, through which the lower, closed, arched end region of the lower loop part 23 can be inserted from the outside. After the spring hook has been released, it returns to its contact position on the cover strip, as is illustrated in FIG. 7. In this way, 17 protective elements can be introduced into the fixing formation of the spring hook, which in this area are completely ge are closed.

FIG. 8 shows different designs of interlocking loop parts, as can be used in the previous figures. In the middle, two interlocking loop parts 22 and 23 are shown, which are formed with completely parallel loop webs 24 and 25 for narrow springs and thus equally large arcuate transitions in the upper and lower end region of the loop webs. In the embodiment shown on the right, these arched transitions are curved differently at the top and bottom of the two loop parts, each with a narrower arc or radius at the top and a further one at the bottom. As a result, the loop webs 24 and 25 no longer run strictly parallel, but decrease in their upward spacing. What is achieved is that on the one hand the protective element in the lower end region of the upper loop part 22 approaches the inner diameter of a wider coil spring and thus experiences a certain amount of guidance or an uncontrolled back and forth swinging and thus rattling can be prevented, while in the upper end region this Loop part 22 is obtained by the narrower arc-shaped transition a holding training 26 which is adapted to a holding part, as will be described in connection with Figures 11 and 12. Even when reaching through an elongated hole of the spring retaining band or intermediate member 13, a not unnecessarily wide arc results. The other loop part 23 is also preferably shaped so that pushing into one another and threading into the spring hook is made easier. The embodiment shown on the left in FIG. 8, broken off at the bottom, shows an upper loop part 22 which is interrupted in the region of its one loop web 25, that is to say has two loop ends 35 and 36 which face one another and can be connected to one another by a closing part 34. Again, it is only necessary that a positive connection in Train direction is reached. In a simple design, however, the two loop ends 35, 36 can each be provided with welded ring eyelets which are penetrated by a screw shaft in the closing case.
With such a design, the upper loop part can also be subsequently arranged through an elongated hole of the intermediate link 13 or around the connecting link 12. This training is therefore particularly suitable for a retrofit kit for protecting already installed coil tension springs. If such a protective element is already attached at the factory or when the spring is being installed, the loop ends of an initially open loop part can subsequently be welded together.

FIGS. 9 and 10 show a form-fitting mounting of the retaining formation 26 of the upper loop part 22 on the band-shaped intermediate member 13 in such a way that the loop part 22 with its upper arch region and the retaining formation 26 thus obtained passes through an elongated opening, for example 20. To do this, an open loop shape is required, which is closed by welding or screwing after passing through the slot opening. The lockable shape of the loop part 22 shown on the left in FIG. 8 is suitable as a retrofit kit.

FIGS. 11 and 12 show another way of fixing the upper end of the loop part 22, namely with the aid of a holding part 27, which is essentially formed by a clamping bolt 28. The gudgeon bolt has a correspondingly wide bolt head and is guided with its bolt shank both through the loop part 22 in its upper, curved end region 26 and through the upper region of an elongated hole - for example 20 - of the intermediate link 13 and then screwed with the aid of a nut. The lower area of the same slot opening 20 passes through the upper hook-shaped connecting end 15 of the spring 14. In this respect, FIGS. 11 and 12 are an enlarged partial representation of the conditions according to FIGS. 5 and 6. It can be seen that the upper connecting end 15 of the spring 14 has practically no freedom of movement in the elongated hole Opening 20 has more and therefore cannot break out of engagement on the intermediate member 13 even in the event of a break in the region of the transition between the hook 15 and the helical body of the spring 14.

In connection with the representations according to FIGS. 13 to 17, an exemplary embodiment of a one-piece design of the protective element 18 is shown. The mechanics of the gate and the mounting of the helical tension spring are identical to those in the previous figures, ie it is a gate as shown in FIGS. 1 to 4. The length-shortened representation according to FIG. 13 shows the protective element 18 in the form of an elongated loop which is guided by the fixing formation 38 of the spring hook 17 through the space enclosed by the spring coil and extends far beyond the upper connection end 15 of the spring 14 and with its upper end finally, as a retaining formation 26, the connecting member 12 between the short lever arms 7 and 8 comprises. The upper connection end 15 of the spring 14 is suspended in any of the elongated holes in the band-shaped intermediate member 13. FIG. 13 shows approximately the position in which the door leaf 2 is in its closed state, that is to say the spring 14 approximately reaches its highest elongation and thus its strongest state of tension. In this position, in which the likelihood of a spring breakage is greatest, the loop 21 is practically free of displacement between the connecting member 12 and the fixing formation 38, so that a lateral deflection of the loop 21 can be kept correspondingly low in the event of a spring break under correspondingly high energy.

FIG. 14 shows three loop forms of one-piece design, the one shown on the right representing the simplest, self-contained design of the loop 21. In the middle shape, the lower ends of the loop webs 24 and 25 are not closed by an arcuate loop transition, but are each deformed into an eyelet 37 in such a way that the surfaces enclosed by the eyelets lie in parallel planes to the plane in the region of the upper end of the loop 21, that is to say in the region of its holding formation 26, is stretched. The middle configuration of the loop 21 can thus be used exactly as shown in FIG. 13 using the closed loop shown on the right in FIG. 14. After the spring hook 17 has been bent, the eyelets 37 can thus be inserted away from the side frame 4 through the slot formed in this way between the support tab 41 and the adjacent section of the door leaf cover strip around the section 40 into the fixing formation 38 of the spring hook 17.

A further embodiment is shown on the left in FIG. 14, namely one in which the loop is divided in the region of a loop web 25 and the loop ends 35 and 36 thus formed can be joined together with the aid of a closing part 34.

The split shape of the loop 21 described last is well suited for a retrofit kit. This solution is made even more elegant in the middle configuration of the loop 21, because it is open in its lower end region and only by inserting the eyelets 37 into the Spring hook 37 is connected by this to a closed loop shape. This middle design of the loop 21 is accordingly inserted from above with the eyelets 37 in front via the connecting member 12 into the spring until the eyelets 37 reach the area of the spring hook and the connecting member 12 is located in the upper end area of the loop 21. Then the eyelets 37 are transferred in the form described in the fixing training 38. Since the eyelets are welded closed in themselves, the positive engagement provided according to the invention prevails again in both end regions of the loop 21.

The one-piece design of the protective element 18 leads to the fact that the upper connection end 15 of the spring 14 which assumes different expansions and thus the intermediate member 13 and the connecting member 12 must be able to move longitudinally with respect to the loop 21. In the embodiment according to FIG. 13, this happens very simply in that the connecting member 12 moves in the longitudinal direction of the loop 21 towards its lower end, so that the upper end of the loop 21 moves further and further away from the connecting member 12 in the course of the opening movement of the door leaf 2 protrudes. This is not harmful, because if the spring breaks in its contracted and thus less pretensioned state, the forces occurring are lower and the existing play of the loop 21 to the connecting member 12 can be accepted.

Another type of longitudinally displaceable mounting of the upper end region of the loop 21 of the one-piece protective element 18 is shown in FIGS. Here, the attachment takes place in the area of the intermediate member 13, specifically above the hooking location of the hook-shaped upper connection end 15 of the spring 14. Opening 20, in which the upper connection end 15 of the spring 14 is also suspended. This in turn limits the freedom of movement of the hook-shaped connecting end 15 accordingly, as has been described in connection with FIGS. 11 and 12. Here too, namely, the hook 15 assumes the lower position, while a fastening bolt 33 of a holding member, designated overall by 29, is guided through the free space above it of the slot opening.

The holding member 29 itself consists of the aforementioned fastening bolt 33, which strives from a U-shaped tab 32, from its inner central region parallel to its U-legs 31. As can be seen in particular in Figure 17, the legs 31 take in the assembled state the band-shaped intermediate member 13 between them. The fastening bolt is of a stepped design, ie it is thicker in its area facing the tab 32 and runs freely into a thinner threaded pin. The step formed between the two different diameters of the bolt 33 serves as a contact surface on the lateral edges of the elongated hole opening 20 in the intermediate member 13, so that only the thinner threaded part of the fastening bolt 33 passes through the elongated hole opening and allows a nut to be unscrewed the band-shaped intermediate member 13 braced against the shoulder of the bolt 33. In this case, a guide channel 30 is formed between the thicker shaft part of the fastening bolt 33 and the legs 31 of the tab 32. One of the loop webs 24 and 25 is inserted into each of the guide channels 30, and there is so much play that the loop webs 24 and 25 can be moved unhindered in their longitudinal direction with respect to the tab 32. FIGS. 15 and 16 show two different displacement positions of the upper edge region of the loop 21 and the holding formation 26 formed therewith. Also here the local attachment of the holding member 29 or the length of the loop 21 is dimensioned such that when the door leaf 2 is closed, the retaining formation 26 includes the fastening bolt 33, so that a shortening of the loop 21 initiated by transverse forces in the event of breakage cannot take place. On the other hand, when the door leaf 2 is opened and the spring becomes shorter or the intermediate member 13 and the holding member 29 migrate downward, the retaining formation 26 of the loop 21 can be correspondingly displaced upward.

Instead of the guide formed by the tab of the holding member, one can form it on the intermediate member itself. The tab can be created instead of the bolt gradation to create the guide channels by inwardly bent webs that are formed in the manufacture of the opening for the introduction of a continuously slim fastening bolt on the tab.

The tab 32 of the holding member 29 and thus the longitudinal displacement guide of the loop 21 is particularly preferably located on the side frame 4 facing the side of the intermediate member 13 designed as an elongated spring retaining band. As a result, the loop 21 remains covered and does not protrude far into the interior, particularly if because of the lower attachment of the holding member 29 than the connecting member 12, the length of the loop 21 is kept correspondingly smaller.

You can also use this protective element for different door sizes or heights by measuring it over the longest expansion distance and, when used at shorter distances or working distances, by separating a certain part of the loop by limiting a fitting between the two loop webs 24 and 25 attached. So this is only the effective loop length by appropriate spatial arrangement of the Determined fitting. The fitting can be placed in a clamped position because the form-fitting mounting of the loop or of the respective loop part is not impaired thereby. The displacement of the clamping fitting in the event of a spring break serves for damping.

Claims (21)

1. Overhead gate with a weight compensation screw tension spring provided on each side frame, which is connected with its one, lower connection end to a spring hook arranged in the lower side frame area of the door and with its other, upper connection end to a connecting link between the ends of two parallel short lever arms of a two-armed pivot lever which is rotatably mounted in the central side frame area and whose long lever arm is articulated to the door leaf, which is guided by means of a pair of these pivot levers and rollers in guide rails between its closed position and its open position in an approximately horizontal position below the ceiling of the room to be locked, wherein a protective element as an elongated structure in the longitudinal direction of the helical tension spring is passed through the longitudinal space encompassed by its spring coils, in its end region mi associated with the lower, in particular round hook-shaped connection end of the spring ttels a connection training is fixed to the spring hook and in its in the implementation position by the spring up to its upper, in particular round-hook-shaped terminal end or beyond protruding end area by means of a retaining training on the connecting member or to an intermediate member, which is from the upper connecting end of the spring to the link leads, is connected, characterized in that the protective element (80), at least in the region of its retaining formation (26), is in the form of a closed or to be closed, the connecting member (12) or the intermediate member (13) or one provided thereon Holding part (27) or holding member (29) has a loop (21; 22) arranged in a form-fitting manner. 2. overhead gate according to claim 1, characterized in that the loop (21; 22, 23) is elongated and is arranged to extend at least over a portion of the reach length of the spring (14). 3. overhead door according to claim 2, characterized in that the loop (21) extends through the entire length of the spring (14). 4. overhead gate according to claim 3, characterized in that the loop (21) in the region of its holder on the connecting member (12) or the holding member (21) of the intermediate member (13) on this longitudinally guided, in the loop longitudinal direction loop webs (24, 25th ) having. 5. overhead door according to claim 4, characterized in that the loop webs (24, 25) with displacement play in both sides of a fastening bolt (33) of the holding member (29) provided guide channels (30) are used. 6. overhead gate according to claim 5, characterized in that the guide channels (30) are each formed between the bolt shaft of the fastening bolt (33) and the legs (31) of a U-shaped tab (32) which by means of the fastening bolt (33) the intermediate link (13) is fixed. 7. overhead door according to claim 2, characterized in that the protective element (18) in the course of its longitudinal extension has at least two loop parts (22, 23) which pass through each other longitudinally. 8. overhead door according to claim 7, characterized in that the up to the upper connection end (15) of the spring (14) or moreover arranged loop part (22) on the intermediate member (13) or its holding part (27) is fixed against displacement. 9. overhead door according to claim 8, characterized in that the upper connection end (15) of the spring (14) associated loop part (22) of the protective element (18) with a loop webs (24, 25) connecting arcuate transition region around a clamping bolt (28 ) laid around and fixed to the intermediate link (13). 10. overhead door according to claim 7, characterized in that the up to the upper connection end (15) of the spring (14) or beyond arranged loop part (22) of the protective element (18) one in the intermediate member (13) featured see opening (19; 20) passes through. 11. overhead door according to claim 9 or 10, characterized in that the intermediate part (13) - in particular in the form of a band wrapping around the connecting member - has a longitudinally extending row of elongated holes in this direction, in the region of which the connecting member ( 12) nearest (20) the loop part (22) is fixed, while the upper, in particular hook-shaped connection end (15) of the spring (14) is suspended in one of the other openings (19). 12. overhead door according to claim 9 or 10, characterized in that the intermediate part (13) - in particular in the form of a connecting element (12) wrapping around the band - has a longitudinally extending row of elongated holes in this direction, in the region thereof one (19; 20) both the loop part (22) is fixed and the upper, in particular hook-shaped connection end (15) of the spring (14) is hooked in, and in particular is arranged with the hook underneath the fixing of the loop part. 13. overhead door according to claim 7, characterized in that the up to the upper connection end (15) of the coil spring (14) or moreover arranged loop part (22) of the protective element (18), the connecting member (12) is held around it. 14. overhead door according to any one of claims 1 to 13, characterized in that the loop (21) or at least one of the loop parts (22, 23), in particular the loop part (22) arranged adjacent to the upper connecting end (15) of the tension spring (14) ), interrupted and can be joined together with the aid of a closing part (34) to form a closed loop shape. 15. overhead door according to claim 14, characterized in that the closing part (34) is designed as a clamping part. 16. overhead door according to claim 14, characterized in that the closing part (34) through the assembled loop ends (35, 36) is formed through, in particular as a bolt. 17. overhead doors according to one of claims 1 to 16, characterized in that the loop (21) or at least one of the loop parts (22, 23), preferably each of which, with the upper connection end (15) of the spring (14) seen The narrowing distance of the loop webs (24, 25) is shaped such that the wider spaced loop end area is only slightly smaller with respect to its outer dimension perpendicular to the longitudinal direction of the spring (14) than its inner diameter, while the narrower spaced loop end area is at the circumferential diameter of the connecting link ( 12) or the holding part (27) or holding member (29) is dimensioned appropriately. 18. overhead gate according to one of claims 1 to 17, characterized in that the the lower connecting end (16) of the spring (14) associated end region of the protective element (18) is fixed in a continuous loop formation on the spring hook (17). 19. overhead door according to one of claims 1 to 17, characterized in that the lower connection end (16) of the spring (14) associated end portion of the protective element (18) via eyelets (37) on the spring hook (17) is fixed to the the two loop webs (24, 25) which are not connected in this end region are formed. 20. overhead door according to one of claims 1 to 20, characterized in that the spring hook (17) in one side region of its fixing formation (38) for the lower, in particular round-hook-shaped connection end (16) of the spring (14) and the lower fixing area of the loop (21) or the lower loop part (23) is attached to the side frame (4) via an angular region (39) and in the other side region of its fixing formation (38) has a downwardly projecting section (40), on which a The side frame is formed from a supporting flap (41) which can be bent resiliently from the side frame (4) for the insertion of the closed loop shape or the eyelets (37) of the protective element (18). 21. overhead door according to one of claims 1 to 20, characterized in that the loop (21) has a fitting fixed to it by clamping, which connects opposite regions of the loop webs.

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