Locking device for a sliding door, in particular an insect screen door

Abstract

Closing device for a sliding door, in particular an insect screen door, comprising a rotatable winding roller (30) with a traction element (34) that can be wound onto and unwound from it, and a spiral spring (37) which is connected at one end (39) to the winding roller (30) and at the other end (38) to a support (5), wherein the preload of the spiral spring (37) is variable.

Description

[0001] The invention relates to a closing device for a sliding door, in particular an insect screen door, comprising a rotatable winding roller with a traction element that can be wound onto and unwound from it, and a spiral spring which is connected at one end to the winding roller and at the other end to an abutment, wherein the position of the abutment can be changed to change the preload, and wherein the abutment is a rotatable pin which can be locked in the set position, to which the spiral spring is attached at its inner end and which can be rotated to change the preload.

[0002] A sliding door can be moved horizontally in a known manner between a closed position, in which passage through the doorway is open, and an open position, in which the doorway is open. An example of such a sliding door is an insect screen door, consisting of a usually rectangular frame, mostly made up of four interconnected profile elements, and an insect screen fabric stretched within the frame. Such a sliding door can, for example, be supported on rollers at the bottom and guided at the top, or vice versa, i.e., supported on rollers at the top and guided at the bottom.

[0003] Most sliding doors, or insect screen doors, are manually operated horizontally, meaning they are opened and closed by hand. To improve convenience and, for example, to ensure that an open insect screen door is actually closed again after a person has passed through, a closing device can be attached to the sliding door or insect screen door. This device enables automatic closing, i.e., moving the door from the open to the closed position. Such a closing device is known, for example, from DE 202023 102 671 U1. The closing device comprises a traction element, such as a rope or thread, etc., which is wound onto a spool and can be unwound from it. The free end of the traction element is connected to the sliding door.The winding roller is mounted on a rotatable bearing and coupled to a coil spring, which is connected to the winding roller at one end and fixed to a stationary support at the other. When the sliding door is opened, the pull cord is pulled along, causing the winding roller to rotate as the cord unwinds from it. This rotation of the winding roller also deforms the coil spring, which is tensioned and generates a restoring force. When the sliding door is released, the coil spring's restoring force rotates the winding roller in the opposite direction; that is, the coil spring relaxes and pulls the winding roller along with it. This inevitably causes the pull cord to be pulled and rewound, and, due to the connection between the pull cord and the sliding door, inevitably moves the door into the closed position.

[0004] The problem here is that the smooth operation of a sliding door, which is usually guided by rollers, depends on various factors and can therefore vary. For example, as is often the case with insect screen doors, brushes may be attached to the door frame that rub against the surrounding structure, affecting smooth operation. Similarly, there may be installation tolerances, meaning there could be a slight tilting of the bearing elements, i.e., the rollers, or the profile rail on which they run, which also affects smooth operation. Finally, the contact pressure of the rollers on the profile rail can also vary, and so on. This means that the force required to close the sliding door can vary depending on the installation. However, the standard closing mechanism always operates with the same force, namely the restoring force of the standardized, integrated coil spring.This leads to the sliding door closing more slowly or quickly from one installation to the next, or not closing completely due to reduced ease of movement, and similar issues.

[0005] A locking device of the type mentioned above comprising a rotatable winding roller with a traction element that can be wound onto and off it, and a spiral spring which is connected at one end to the winding roller and at the other end to an abutment, wherein the preload of the spiral spring is variable, wherein the position of the abutment is variable to change the preload, and wherein the abutment is a rotatable pin which can be locked in the set position, to which the spiral spring is attached at its inner end and which can be rotated to change the preload, is known from DE 10 2014 103 074 A1.

[0006] Also known from DE 10 2010 023 444 A1 is a front door, in particular an insect screen door, comprising a frame and a sliding sash slidably received in it, wherein the sliding sash is connected via a pulling element to a retraction element which builds up a restoring force when the sliding sash is pushed out of the closed position.

[0007] The invention is based on the problem of providing an improved closing device for a sliding door, in particular an insect screen door.

[0008] To solve the problem, in a locking device of the type mentioned at the outset, it is provided according to the invention that the pin has a toothed section which is coupled to an adjusting device via a toothed connection.

[0009] The decisive factor for the closing process is the restoring force generated by the coil spring. This force is the same for every closing mechanism when a standardized coil spring is used, which is always positioned and installed in the same way at the abutment and the winding roller. It is now provided that the preload of the coil spring, which is present in the closed position of the sliding door, can be varied. By adjusting the preload of the coil spring, the restoring force that can be generated by it, and which is exerted on the sliding door in the open position or during its movement into the open position, can be increased or decreased accordingly, based on the spring characteristic curve of the coil spring.By varying the preload, the actual restoring force acting on the sliding door, and thus the pulling force with which the sliding door is drawn into the closed position, can be changed and adapted to the actual conditions. A very smooth-running sliding door requires a lower restoring force, which is why the coil spring is adjusted to have a lower preload, meaning it is not overly preloaded. With a less smooth-running or possibly even stiff sliding door, the coil spring can be preloaded more strongly, so that the coil spring, which deforms further when the sliding door is opened, generates a significantly greater restoring force, resulting in a greater pulling force exerted on the sliding door via the closing mechanism.This allows even a slightly stiff sliding door to be closed at the desired speed and with the necessary safety of a complete closure.

[0010] The intended adjustability of the coil spring's preload consequently allows for adaptation of the locking mechanism and its function to the actual installation situation, as it enables adjustment to the given ease of movement of the sliding door's bearing. This, in turn, means that various installed sliding doors with their associated locking mechanisms can be automatically closed in a virtually identical manner using the locking mechanism according to the invention.

[0011] To change the preload, the position of the support can be adjusted. This means that the attachment point of the inner end of the coil spring can be changed as needed, whereby changing the support position causes the coil spring to be wound further or less tightly.

[0012] The abutment is a rotatable pin that can be locked in the set position. The coil spring is attached to this pin at its inner end, and the preload can be adjusted by rotating the pin. This locking pin, which forms the abutment, is therefore rotated around its longitudinal axis as needed. This causes the inner end of the coil spring, which is attached to or suspended from the pin, to also rotate clockwise or counterclockwise. The coil spring can thus be wound or unwound, allowing for easy adjustment of the preload.

[0013] According to the invention, the pin has a toothed section to allow for such rotation, which is coupled to an adjusting device via a toothed connection. A corresponding adjusting device, operated by the installer, is provided, which is coupled to the toothed pin via a toothed connection. When the adjusting device is actuated, the pin can be rotated via this toothed connection until the desired preload is achieved, and the pin is then locked in its final position. Whether the desired and required preload has been reached can be easily checked by opening and automatically closing the sliding door. If the door closes too slowly or not completely, the pin is rotated slightly further, thus increasing the preload; if it closes too quickly, the pin can be rotated in the other direction, reducing the preload.

[0014] The adjusting device itself can include a tool-operated, rotatable adjusting element, the actuation of which transmits a torque via the toothed connection that causes the pin to rotate. The adjusting element can be turned, for example, with a screwdriver or an Allen key, which is extremely easy for the installer. When the rotatable adjusting element is turned, the toothed connection is engaged, causing the pin forming the abutment to rotate accordingly in one direction or the other.

[0015] In a further specification, the adjusting device can include a gear that is directly or indirectly coupled to the toothed section and the adjusting element. The adjusting element is thus either directly or indirectly coupled to a gear that can be rotated via the rotatable adjusting element. The gear, in turn, can be directly or indirectly coupled to the toothed section, thus forming the toothed connection.

[0016] Preferably, the gear can be coupled to the toothed section via a rotatably mounted intermediate gear. For example, if the gear is directly coupled to the rotatable adjusting element and an intermediate gear is interposed between the gear and the toothed section, a rotation of the adjusting element is converted into a rotation of the gear, which in turn, due to the meshing of the teeth, rotates the intermediate gear. This intermediate gear, in turn, due to the meshing of the teeth, rotates the toothed section and thus the abutment pin. Consequently, a gear redirection is achieved, which is either a reduction or a step-up, depending on the design of the individual toothed elements. The advantage of interposing such an intermediate gear is that the direction of rotation of the adjusting element and the resulting direction of rotation of the abutment pin are the same.

[0017] In a further embodiment of this design, the adjusting element may have a receiving section and the gear a coupling section, or vice versa, wherein the coupling section engages positively with the receiving section, forming a rotationally fixed connection through which the torque applied to the adjusting element can be transmitted to the gear. The gear and the adjusting element are thus two separate components, which are, however, rotationally fixed to each other via the positive locking connection resulting from the engagement of the coupling section with the receiving section. For this purpose, interlocking positive locking geometries are preferably provided on the locking section and the locking receptacle. Preferably, the coupling section and the receiving section can have a polygonal cross-section, for example, in the form of a hexagon.

[0018] According to a preferred embodiment, the actuating element can be moved against a restoring force from a non-actuating position, in which rotation of the adjusting element is locked, to an actuating position, in which the locking is released. This embodiment of the invention allows for simple locking of the abutment pin in its set position. This is because the adjusting element, and consequently the downstream gear components, can only rotate when the adjusting element is actively pressed against a restoring force from a non-actuating position, in which it is locked against rotation, to an actuating position, in which it is no longer locked. Only then can the adjusting element be rotated, resulting in a rotation of the abutment pin. When the adjusting element is released, the restoring force moves it back to the non-actuating position, where it is locked.Since the adjusting element is rotationally fixed to the gear via the positive locking connection, locking the adjusting element inevitably leads to locking the entire downstream gear assembly and thus also the support pin.

[0019] To achieve this linear movement against the restoring force, it can be further provided that when the adjusting element moves from the non-actuated position to the actuated position and vice versa, the coupling section within the receiving section is linearly movable. This means that the adjusting element is moved almost axially from the non-actuated position into or against the gear, causing the coupling section to engage deeper into the receiving section. This movement occurs against the restoring force of the spring element, so that when the adjusting element is released, the spring element returns the adjusting element to its original position, thus moving the coupling section slightly out of the receiving section, while both components maintain their positive connection at all times.

[0020] The adjusting element is preferably moved against a spring element, in particular a helical spring, which generates the restoring force. An axially acting restoring force can be easily generated via such a helical spring. The adjusting element is supported at one end of the helical spring, while the other end of the helical spring is supported.

[0021] It is particularly advantageous if the spring element, especially the coil spring, is received in a receptacle provided on the gear, especially the coupling section. The spring element, or coil spring, is therefore arranged axially to the gear and the adjusting element, or the coupling section and the receiving section, resulting in a very compact overall design.

[0022] Preferably, a locking section is provided on the adjusting element itself, which, in the non-actuated position, engages in a fixed locking receptacle, or conversely, from which it can be moved when moved into the actuated position. The locking section and the locking receptacle secure the adjusting element in the non-actuated position, so that the locking is automatic as soon as the adjusting element is in the non-actuated position. Of course, the arrangement can also be reversed, i.e., that a locking receptacle is provided on the adjusting element, while the locking section is fixed to a third-party object.

[0023] Here too, the locking section and the locking receptacle can have a polygonal cross-section, for example a hexagon. When both interlock, this again results in a rotationally fixed connection between the rotatable adjusting element and the stationary third object on which the locking receptacle is formed.

[0024] In a further development of the invention, a housing can be provided comprising a plate-shaped support and a housing cover, wherein the pin and, if provided, the gear and the intermediate gear are rotatably mounted on the support, and the locking receptacle is provided on the housing cover. The housing serves, as it were, as a mounting platform for the individual further elements of the locking device, which is preferably built on the support and encapsulated by the housing cover.

[0025] In addition to the locking device itself, the invention relates to an insect screen device comprising a sliding insect screen door which is slidably mounted on a support rail via bearing elements, and a locking device of the type described above, the traction element of which is connected to the insect screen door.

[0026] The insect screen door can have a frame, usually made of aluminum elements, comprising an upper frame element on which the bearing elements are mounted. This means that the insect screen door is suspended from the top and guided by rollers. Alternatively, a lower frame element can be provided on which the bearing elements are mounted, so that the insect screen door is supported by rollers on the underside.

[0027] The support rail itself can be a profile rail with a rectangular cross-section, two side walls, and a slotted lower wall that allows the bearing elements to engage. One or more guide sections for the bearing elements are provided on this lower wall. The support rail, usually an aluminum rail, is therefore rectangular in cross-section but has a slot on its underside through which the bearing elements, i.e., the rollers, can engage into the interior of the profile rail and run on corresponding guide sections.

[0028] The side wall can have a local recess into which the locking mechanism is inserted, with the locking mechanism overlapping the other side wall. This allows the locking mechanism to be mounted concealed from the visible side, as it is covered by the other side wall.

[0029] Preferably, the locking mechanism is designed to be as narrow as possible so that the carrier can be flush with the side wall. This results in a very compact design; the locking mechanism does not protrude laterally and can be integrated even into a small space within the profile rail. Furthermore, since the locking mechanism does not protrude laterally, the profile rail can be mounted close to a wall.

[0030] Further advantages and details of the present invention will become apparent from the exemplary embodiments described below and from the drawings. These show: Fig. 1 an exploded view of a locking device according to the invention, Fig. 2 the shooting range Fig. 1 in a partially assembled state, Fig. 3 a partial view of the locking mechanism Fig. 2 with transparent housing cover, Fig. 4 the locking mechanism Fig. 2 with open winding roller and mounted spiral spring, Fig. 5 the complete locking mechanism in a perspective view, Fig. 6 an insect screen device according to the invention with a locking device according to the invention, Fog. 7 a partial view of the insect screen device showing the support rail with integrated locking mechanism, Fig. 8 the arrangement according Fig. 7 with cut-out support rail, and Fig. 9 a partial view of the insect screen with cut-open support rail and sliding door pushed open.

[0031] Fig. Figure 1 shows an exploded view of a locking device 1 according to the invention for a sliding door, primarily an insect screen door. The locking device 1 comprises a housing 2 with a plate-shaped support 3 and a housing cover 4, which can be placed on and attached to the plate-shaped support 3.

[0032] On the plate-shaped support 3, a support 5 in the form of a rotatably mounted pin 6 with a retaining receptacle 7 for the inner end of a spiral spring is provided, which pin 6 has a toothed section 8 in the form of a gear 9, wherein the pin 6 sits centrally on the gear 9.

[0033] Furthermore, an adjusting device 10 is provided, comprising a rotatable adjusting element 11, which is actuated by a tool and is coupled to the pin 6, part of which is the gear 9, via a toothed connection 64. The adjusting device 10 includes a gear 12, which is coupled to the adjusting element 11 in the assembly position. For this purpose, an axially projecting coupling section 13 with a hexagonal cross-section is provided on the gear 12, while the adjusting element 11 is designed in the shape of a sleeve and has an axial recess forming a receiving section 14, also with a form-compatible hexagonal cross-section, into which the coupling section 13 engages positively, forming a rotationally fixed connection. A receiving section 15 in the form of a blind hole is also formed on the coupling section 13, into which a spring element 16, in this example a coil spring 17, engages.The adjusting element 11 is axially supported on this coil spring 17, which protrudes from the receptacle 15, and can therefore be pressed axially towards the gear 12 at the rear against the restoring force of this coil spring 17 when an adjustment operation is to be carried out, while the adjusting element 11 is pushed axially away from the gear 12 again when relieved by the coil spring 17.

[0034] The adjusting element 11 also has a locking section 18, here also in the form of a hexagon, which, in a non-actuated position (i.e., when the adjusting element 11 is not axially pressed against the coil spring 17), locks the adjusting element 11 in the given rotational position. This also locks the position of the pin 6, resulting from the locking of the toothed connection 10. For locking, a form-compatible locking receptacle 20, also with a hexagonal cross-section, is formed on the inside of a recess 19 on the housing cover 4. In the non-actuated position, a projecting actuating section 21 of the adjusting element engages an opening 22 in the recess 19, so that the locking section 18 engages in the locking receptacle 20 and rotation is prevented.A tool holder 23 is formed on the actuation section 21, in the example shown in the form of a hexagonal recess for receiving an Allen key.

[0035] The gear 12 meshes with an intermediate gear 24, which in turn meshes with the gear 9. The gear connection is established via the gears 12, 24, and 9, through which the adjusting element 11 is kinetically coupled to the abutment 5, i.e., the pin 6. Consequently, if the adjusting element 11 is pressed axially against the helical spring 17 in the direction of the gear 12 from a non-actuated position, in which the locking section 18 engages the locking receptacle 20, the adjusting element 11 can be rotated. The torque is transmitted via the positive-locking coupling of the coupling section 13 with the receiving section 14 to the gear 12 and from there via the intermediate gear 24 to the gear 9, thereby rotating the pin 6.Depending on the direction of rotation of the adjusting element 11, the direction of rotation of the pin 6 is defined, whereby the direction of rotation of the adjusting element 11 is the same as that of the pin 6, resulting from the intermediate gear 24.

[0036] The rear surface 25 of the housing cover 4 is designed accordingly and provided with suitable recesses, such as a recess for receiving the gear 9 and the intermediate gear 24, so that the rear surface 25 of the housing cover 4 rests flat on the front surface 26 of the carrier 3. Several mounting pins 27 are provided projecting from the front surface 26, which extend through corresponding openings 28 or engage in plug-in receptacles 29. Furthermore, the housing cover 4 has an opening 42 through which the pin 6 engages in the assembled position.

[0037] Furthermore, the closing device 1 comprises a winding roller 30, with a roller body 31 and a cover 32 shown at a distance in the view. The cup-shaped roller body 31, in which a spiral spring 37 is received in the assembly position, has a circumferential receiving groove 33 for a pulling element 34 in the form of a pull rope, which is fixed at one end 35 in the receiving groove 33, while the other end 36 is connected to the sliding door (not shown).

[0038] Furthermore, the aforementioned spiral spring 37 is provided, which is housed inside the winding roller 30. The spiral spring 37 has an inner end 38 that is angled and engages in the slot-shaped retaining recess 7 of the pin 6 and is locked therein, so that it is carried along when the pin 6 rotates. The outer end 39 is attached to the winding roller 30 or the roller body 31, for example, by means of a hook-shaped deformation of the end 39, so that when the winding roller 30 rotates, resulting from a sliding movement of the sliding door connected to the traction element 34, it is carried along when the sliding door is opened, or when the sliding door closes automatically, the winding roller 30 is carried along by the relaxing spiral spring 37 and the traction element 34 is wound up, which leads to the sliding door being pulled shut.

[0039] In the assembly position, the pin 6 passes through a central opening 40 in the roller body and the cover 32 which is firmly connected to the roller body 31, thus ensuring that the inner end 38 of the spiral spring 37 cannot move axially away from the pin 6.

[0040] Finally, a locking element 41 is provided, which is attached to the housing cover 4 after the winding roller 30 has been mounted on the pin 6 and which overlaps and locks the winding roller 30 at its edge.

[0041] Fig. Figure 2 shows the locking device 1. Fig. 1 in the partially assembled state. The housing 2 is closed, i.e., the housing cover 4 sits on the support 3, and all elements to be arranged between them are installed accordingly. Visible are the actuating section 21, which protrudes slightly from the recess 19, as well as the pin 6, which extends through the opening 42 in the housing cover 4.

[0042] The spiral spring 37 is assumed to already be received in the ring-shaped roller body 31 and fixed to it at its outer end 39; the cover 32 is closed. However, the inner end 38 of the spiral spring 37 is not yet hooked onto the pin 6.

[0043] Fig. Figure 3 shows a view of the housing 2 with the support 3 and the housing cover 4, shown here transparently, so that the components installed between them are visible. Shown are the adjusting element 11, the associated gear 12, the intermediate gear 24, and the gear 9 with the pin 6. This illustration also shows the corresponding recesses on the rear side 25 of the housing cover 4, in which the gear 24 and the gear 9 are received. For the sake of clarity, the winding roller 30 is not shown in this view, but the locking element 41 mounted on the housing cover 4 is.

[0044] Fig. Figure 4 shows the assembled locking device 1, i.e., that, starting from Fig. 2, the winding roller 30 is placed on the pin 6. The inner, angled end 38 of the spiral spring 37 engages in the slotted retaining recess 7, thus providing a rotationally fixed connection between the end 37 and the pin 6. The spiral spring 37 winds outwards and its outer end 39 is hooked onto a corresponding retaining recess 43 of the roller body 31.

[0045] Fig. Figure 5 shows the fully assembled locking device 1, although in this example the pulling element 34 is not shown. Based on the arrangement according to Fig. 4 the lid 32 is placed on and fixed, so that the winding roller 30 is closed, as it is also fixed via the locking part 41 on the pin 6.

[0046] If, after mounting the locking device 1 on a support rail on which the sliding door (not shown), for example, the insect screen door, is horizontally mounted via bearing elements, in particular rollers, the automatic closing operation possible via the locking device 1 is to be adjusted with regard to the closing speed, the preload of the spiral spring 37 can be varied with the locking device 1 according to the invention. This may be necessary since the ease of movement of the sliding door can vary from case to case due to various factors. For example, the free movement of an insect screen door is slightly impaired by corresponding brushes that rub against the surrounding structure and seal the gap between the door and the surrounding structure.Depending on the applied force and thus the friction of the brushes against the surrounding structure, greater or lesser resistance is encountered to smooth operation. Assembly tolerances in the area of ​​the bearing elements or the support rail can also affect their smooth operation, etc., and thus the movement of the sliding door. Several factors can therefore vary the smoothness of operation, which can lead to either a very slow closing process, the door not being able to close completely, or the closing process being too fast and the sliding door running too quickly against a damping device that is normally provided to cushion the entry into the closed position. The spiral spring 37 is responsible for the automatic closing of the manually pushed sliding door.When the sliding door is opened from the closed position, the pull cord 34 is inevitably engaged, causing the winding roller 30 to rotate. Since the outer end 39 of the coil spring 37 is attached to this roller, it is inevitably deformed and tensioned, generating a restoring force after the inner end 38 of the coil spring 37 is locked onto the fixed pin 6, as described. The further the sliding door is opened, the greater the deformation and tension of the coil spring 37. If the sliding door, which is locked in the fully open position (e.g., by a locking device), is either released or disengaged, the restoring force of the coil spring 37 causes the winding roller 30 to rotate. This pulls the pull cord 34, which in turn pulls the attached sliding door back into the closed position.As described above, this closing movement can be influenced by the various circumstances mentioned above, making it necessary to adjust the closing device accordingly to ensure a similar closing process in all assembly cases.

[0047] The locking device according to the invention now allows the preload of the coil spring 37, which is responsible for the automatic closing action, to be adjusted. For this purpose, the technician simply needs to engage the adjusting element 11 with a tool, insert the tool (here an Allen key) into the tool holder 23, and press the adjusting element 11 axially against the coil spring 17. This releases the locking engagement of the locking section 18 in the locking receptacle 20, allowing the adjusting element 11 to rotate. During this axial displacement movement of the adjusting element 11, the positive locking connection between the coupling section 13 and the receiving section 14 remains permanently engaged; it is never released, meaning that a rotationally fixed connection between the adjusting element 11 and the gear 12 is always maintained.When the pressed adjusting element 11 is rotated via the tool, this causes the pin 6 to rotate, which in turn engages the inner end 38 of the coil spring 37. Consequently, depending on the direction of rotation, the coil spring 37 is either tightened or loosened. By adjusting the preload present in the closed position of the sliding door, the restoring force, which is built up by the movement of the sliding door in conjunction with the deformation of the coil spring 37 within it, can ultimately be varied accordingly. When the installer releases the pressure on the adjusting element 11, it is pressed axially against the housing cover 4 again by the coil spring 17, so that the locking section 18 engages in the locking receptacle 20 and the entire adjusting mechanism is locked against reverse rotation.Because if the adjusting element 11 cannot rotate, no torque can be transmitted in any direction, and the pin 6, and thus the adjustment of the coil spring 37, is locked. The technician can now easily test the sliding action and, depending on the result, readily make a further adjustment in a subsequent step.

[0048] Fig. Figure 6 shows an insect screen device 44 according to the invention, comprising a sliding door 45 consisting of a frame 46 formed by four profile elements 47, 48, 49, 50, in which an insect screen 51 is tensioned. The frame 46 is guided on a guide rail 52 located on the floor via the lower profile element 49. A locking stop 53 is provided on the guide rail 52, against which the sliding door 45 runs in the open position and on which it is releasably locked. The actual sliding bearing is provided on the upper side by two bearing elements 54 arranged on the upper profile element 50, which are roller bearings, each comprising at least one roller that engages in a support rail 55 and is suspended and runs there on corresponding guide sections. The closing device 1 according to the invention is recessed in the support rail 55. Fig. 6 is only indicated and is located at the right end of the support rail 55.

[0049] Fig. Figure 7 shows the right end region of the support rail 55, which is designed as a profile rail 56 with a rectangular cross-section when viewed from the side. It has an upper wall 57, a front side wall 58, a rear side wall 59, and a lower wall 60, the lower wall 60 being longitudinally slotted so that two guide sections 61 are formed on both sides of the slot (see Figure 7). Fig. 9), on which the respective roller 62 of the respective bearing element 54 runs. How Fig. As shown in Figure 7, the locking device 1 according to the invention is mounted virtually from the rear, for which purpose a corresponding recess is cut out in the rear of the side wall 59, into which the locking device is inserted. The locking device 1 itself is very narrow and can therefore be easily integrated without protruding towards the rear. The front of the locking device 1 is covered by the front side wall 58. Only an opening 63 is formed in the front side wall 58, through which the actuating section 21 of the adjusting element 11 engages, so that the installer has access to the tool holder 23. The tension member, not shown in detail, runs inside the profile rail 56 and extends to the bearing element 34 located closest to the locking device 1, with which it is connected.

[0050] Fig. 8 shows the view accordingly Fig. Figure 7, where the front side wall 58 has been removed, i.e., the profile rail 56 is shown in partial section. The figure clearly illustrates the integration of the locking device 1 into the profile rail 56, with the support 3 preferably being flush with the rear side wall 59, as shown. This view also shows the rear guide section 61, on which the roller 62 runs; a second guide section 61 is formed on the front wall 58 (not shown).

[0051] Fig. Finally, 9 shows a partial view of the insect screen. Fig.Figure 6 shows a section of the sliding door 45 with a bearing element 54 arranged on the upper profile element 50, the roller 62 of which is supported on the guide sections 61. Also shown are the closing device 1 and the tensioning element 34, which runs from the winding roller 30 to the bearing element 54. If, in this example, the sliding door 54 is pushed further to the left, as shown by arrow P1, the bearing element 54 moves away from the closing device 1, the tensioning element 34 is unwound from the winding roller 30 as it rotates, and at the same time the coil spring 37 is further tensioned.If, however, the sliding door 45 is released, it closes automatically, as shown by arrow P2, because the tensioned coil spring 37 relaxes and, via its restoring force, rotates the winding shaft 30 in the opposite direction, so that the pull cord 34 is wound up and the sliding door 45 is inevitably pulled towards part P2. Since the preload of the coil spring 37 can be adjusted as described, this closing movement is correspondingly adjustable so that the respective sliding door 45 can be closed uniformly from one installation location to the next, regardless of the individual smoothness of the sliding door 45's bearing. Shortly before reaching the closed position, the sliding door 45 runs against a damping stop 66 of a damping element 65, which dampens and slows the movement towards the end.

Claims

[1] Closing device for a sliding door, in particular an insect screen door, comprising a rotatable winding roller (30) with a traction element (34) that can be wound onto and unwound from it, and a coil spring (37) which is connected at one end (39) to the winding roller (30) and at the other end (38) to an abutment (5), wherein the preload of the coil spring (37) is variable, wherein the position of the abutment (5) is variable to change the preload, and wherein the abutment (5) is a rotatable pin (6) that can be locked in the set position, to which the coil spring (37) is attached at its inner end (37) and which can be rotated to change the preload, characterized by , that the pin (6) has a toothed section (8) which is coupled to an adjusting device (10) via a toothed connection (64). [2] Locking device according to claim 1, characterized by, that the adjusting device (10) comprises a rotatable adjusting element (11) that can be actuated with a tool, and when actuated, a torque that causes the rotation of the pin (6) can be transmitted via the toothed connection (64). [3] Locking device according to claim 2, characterized by , that the adjusting device (10) comprises a gear (12) which is directly or indirectly coupled to the gear section (8) and the adjusting element (11). [4] Locking device according to claim 3, characterized by , that the gear (12) is coupled to the toothed section (8) via a rotatably mounted intermediate gear (24). [5] Locking device according to claim 3 or 4, characterized by, that the adjusting element (11) has a receiving section (14) and the gear has a coupling section (13), or vice versa, wherein the coupling section (13) engages positively in the receiving section (14) forming a rotationally fixed coupling, via which the torque applied to the adjusting element (11) can be transmitted to the gear (12). [6] Locking device according to claim 5, characterized by that the coupling section (13) and the receiving section (14) have a polygonal cross-section. [7] Locking device according to claim 5 or 6, characterized by , that the adjusting element (11) can be moved against a restoring force from a non-actuating position in which a rotation of the adjusting element (11) is locked, into an actuating position in which the locking is released. [8] Locking device according to claim 7, characterized by, that when the adjusting element (11) moves from the non-actuating position to the actuating position and vice versa, the coupling section (13) is linearly movable in the receiving section (14). [9] Locking device according to claim 7 or 8, characterized by , that the adjusting element (11) is movable against a spring element (16) generating the restoring force, in particular a coil spring (17). [10] Locking device according to claim 9, characterized by , that the spring element (16), in particular the coil spring (17), is received in a receptacle (15) provided on the gear (12), in particular the coupling section (13). [11] Locking device according to any one of claims 7 to 10, characterized by , that a locking section (18) is provided on the adjusting element (11) which engages in a fixed locking receptacle (20) in the non-actuating position, or conversely, from which it can be moved when moving into the actuating position. [12] Locking device according to claim 11, characterized by , that the locking section (18) and the locking receptacle (20) have interlocking form-locking geometries, in particular a polygonal cross-section. [13] Locking device according to claim 11 or 12, characterized by , that a housing (2) is provided, comprising a plate-shaped support (3) and a housing cover (4), wherein the pin (6) and, if provided, the gear (12) and the intermediate gear (24) are rotatably mounted on the support (3) and the locking receptacle (20) is provided on the housing cover (4). [14] Insect screen device comprising a sliding insect screen door (45) which is slidably mounted on a support rail (55) via bearing elements (54), and a closing device (1) according to one of the preceding claims, the traction element (34) of which is connected to the insect screen door (45). [15] Insect screen device according to claim 14, characterized by, that the insect screen door (45) has a frame (46) comprising an upper frame element (50) on which the bearing elements (54) are provided, or a lower frame element on which the bearing elements (54) are provided. [16] Insect screen device according to claim 15, characterized by , that the support rail (55) is a profile rail (56) having a rectangular cross-section with two side walls (58, 59) and a slotted lower wall (60) allowing engagement of the bearing elements (54), on which one or more guide sections (61) for the bearing elements (54) are provided. [17] Insect screen device according to claim 16, characterized by , that a side wall (59) has a local recess into which the locking device (1) is inserted, the locking device (1) being overlapped by the other side wall (58). [18] Insect screen device according to claim 17, characterized by, that the carrier (3) of the locking device (1) is flush with the side wall (59) having the recess.

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