Setting head with incorrect fastening detection for setting tools for mechanical fastening of insulation material and waterproofing membranes on flat roofs

Abstract

Setting head with incorrect fastening detection for setting tools for the mechanical fastening of insulation material (161) and sealing membranes (162) on flat roofs, comprising a tubular attachment which is designed to surround a screw rod (130) of a setting tool which is driven by a screwdriver, in which the tubular attachment comprises a guide tube (90), an adjusting tube (70), a spring tube (50) and a bell (10) which are coaxially connected to one another, wherein the bell (10) is designed to receive a head plate (111) of a fastening element (110), and the bell (10) has pivotable grippers (27) with hooks (28) formed thereon, which are designed to extend with the hooks (28) under the head plate (111) of the fastening element (110) and to engage underneath it, and in a second position outside the path of movement of the projections emerging from the bell (10) emerging head plate (111) to be positioned,in that a pressing ram (30) with a pressure plate (32), which can be lowered by the lifting movement of a screwdriver mounted on the setting head (1), ejects the head plate (111) from the bell (10) and in the process displaces the grippers (27) with their hooks (28), wherein the pressing ram (30) is designed to position itself in the path of movement of the grippers (27) when the setting head (1) is withdrawn from a fastening point without a prior setting process, so that the grippers remain in their locked position relative to the head plate (111) of a fastening element (110) that has not been ejected from the bell (10), in which the pressure plate (32) of the pressing ram (30) prevents a pivoting movement of the grippers (27) and thus the fastening element (110) with the setting head (1) is pulled upwards out of the roof package.

Description

[0001] For the mechanical fastening of roofing membranes and insulation materials on flat roofs, both hand-held screw drivers and automatic screw drivers are used, which are collectively referred to as setting tools. These setting tools are used to install fasteners consisting of a screw anchored to the roof substrate and a load-distributing plate. The load-distributing plates can be made of metal or plastic. In the case of plastic load-distributing plates, they can also be part of a grommet into which the screw is countersunk.

[0002] A mobile setting tool for pre-loaded fasteners is described in DE 199 21 426 C1. Depending on their level of automation, such setting tools are also referred to as automatic setting tools. These tools typically feature a magazine containing a large number of fasteners. Furthermore, such setting tools include a lifting device to which a screwdriver is attached. Adjusting movements are derived from the screwdriver's up and down movement to separate fasteners from the magazine and place them in a screwing position. The screwing then takes place. After each setting process is completed, the automatic setting tool is moved to the next fastening location, and the next setting process is performed.

[0003] With hand-operated fastener setting tools, typically only one fastener is loaded into the setting tool. This fastener is positioned vertically over the fastening point and, by applying appropriate pressure, a feed is generated. The fastener screw is then driven into the roof substrate by the simultaneous engagement of a screwdriver bit, which is set in rotation by a screwdriver.

[0004] If the installation process is carried out correctly, the screw anchors itself into the roof substrate and, thanks to its positive connection with the load distribution plate, presses the plate against the roof membrane. Adequate wind uplift protection is achieved by determining the number and spacing of the fastening points according to the specific building conditions.

[0005] If the roof substrate consists of trapezoidal steel sheets, care must be taken when determining the fastening points to ensure that they are always located above a high bead of the trapezoidal sheet. If a fastening point is incorrectly selected, so that it inadvertently falls into the area of the low bead of the trapezoidal steel sheet, the screw cannot anchor itself due to its relatively short length, and this results in incorrect fastening. If the user recognizes this, a fastening element embedded in the roofing membrane and insulation, which is also referred to as a fastener, must be levered out of the fastening point. In the worst case, the incorrect fastening is not recognized, which can ultimately compromise the overall protection against wind suction forces.

[0006] CH 595 954 A5 describes a guide device for a fastener, which can be connected to a drive tool with a housing and has a drive shaft. A sleeve is provided in which pivoting fingers are arranged, on which a fed fastener sits with its washer. When a screwdriver is lowered, the fastener is guided past the fingers, which are pivoted out of the path of movement of the fastener. The fingers are held in the path of movement of the fastener by a circumferential retaining ring. The elasticity of the retaining ring is selected such that the fingers only receive a clamping force sufficient to ensure correct alignment of the fastener for assembly. A targeted and lasting locked position when counterforces occur is not possible with this arrangement.This makes it impossible to detect or respond to incorrect fastening. With the device according to CH 595 954 A5, the fingers remain in the fastener's path of travel only as long as there are no opposing forces greater than the clamping force of the retaining ring. This means that the retention force of the roof structure into which the fastener was driven is sufficient to hold the fastener in place while the guide device is removed from the fastening point. This is because the fingers evade the fastener's path of travel due to the weak locking effect exerted solely by the retaining ring.

[0007] The object of the present invention is to equip a setting tool with means by which incorrect fastenings can be reliably detected and avoided.

[0008] This problem is solved by a setting head with the features of the main claim.

[0009] Further features of the invention are described in the dependent claims.

[0010] According to the invention, a setting head with a faulty fastening detection for setting tools for the mechanical fastening of insulation material and waterproofing membranes on flat roofs is proposed, which comprises a tubular attachment which surrounds a screw rod and can be adapted to a screwdriver, ie can be coupled to an electrically driven screwdriver.

[0011] The setting head according to the invention is characterized in that the tubular attachment comprises a guide tube, an adjusting tube, a spring tube, and a bell, which are coaxially connected to one another. The bell receives a head plate of a fastening element and has pivotable grippers with hooks formed thereon, which are designed, in a first position, to extend with the hooks under the head plate of the fastening element and engage underneath it, and in a second position to position them outside the path of movement of the head plate emerging from the bell. This is achieved by a press ram ejecting the head plate from the bell, thereby displacing the grippers, which can be lowered by the lifting movement of a screwdriver mounted on the setting head.In this embodiment, when the setting head is removed from the fastening point in the event of a previously incorrect setting process, the press ram positions itself in the pivoting path of the grippers, i.e. in their path of movement, which means that they remain in their locked position relative to the head plate of a fastening element that has not been ejected from the bell.

[0012] The pressure plate of the press ram prevents the grippers from pivoting. This allows the fastener to be pulled out of the roof package with the setting head facing upwards.

[0013] If the fastening point is inadvertently selected over a deep bead in a trapezoidal steel sheet that is invisible to the user, resulting in the screw piercing empty space, no resistance is felt, and further pressure on the fastener is interrupted. According to the invention, at this point, the head plate has not yet been released from the bell, as the press ram has not been pushed further downward. This is made possible by a clearance or free space in the bell chamber. The head plate of the fastener thus remains enclosed in the bell.

[0014] During the upward pull, the pressure plate of the pressing ram lifts off the head plate of the fastener as the pressing ram moves upward in the chamber of the bell, locking the grippers against pivoting. This keeps the grippers below the head plate and prevents the fastener from escaping from the setting tool. The fastener is then pulled upward again with the setting head. However, without the inventive positioning of the pressing ram in the path of movement of the grippers, the retaining forces of the roof structure acting on the fastener are sufficient to pull the head plate out of the bell of the setting head. The grippers are pivoted into a release position.However, since the pressing ram is positioned in the pivoting path of the grippers, a pivoting movement of the grippers is prevented and they remain in their locked position, so that the head plate, and thus the entire fastening element, together with the setting head, is pulled upwards out of the roof package.

[0015] This ensures that a fastener not anchored in the roof substrate always remains in the bell of the setting head when the setting tool is removed and is pulled out of the roof structure. The position of the setting tool can then be corrected and the setting process repeated at a new (correct) fastening point.

[0016] It is particularly advantageous if the bell comprises a cylindrical sleeve that is open at the bottom and surrounds a chamber that is closed at the head by a cover that has a central bore. In this embodiment, the wall of the sleeve is preferably interspersed with radially distributed incisions extending parallel to the longitudinal axis of the setting head, each of which accommodates a pivoting gripper. The pivot axes of the respective grippers are preferably aligned orthogonally to the longitudinal axis. The wall of the bell thus serves as a bearing for the pivot axes of the grippers. When at rest, the grippers close the sleeve-shaped bell.

[0017] A further advantage arises if, according to a further embodiment, the cylindrical sleeve of the bell has a radial annular groove, which, together with a rear groove on the grippers, forms a circumferential groove. A spring is inserted into this circumferential groove, which surrounds the bell with the grippers inserted therein in a belt-like manner. The grippers thus complete the outer geometry of the bell. The spring is preferably an endless spiral tension spring or a spiral tension spring whose ends are connected to each other via corresponding hooks.

[0018] Because the press ram is mushroom-shaped and features a pressure plate with a threaded stud, it can move up and down within the tubular attachment like a tappet. In this case, the threaded stud not only serves to connect to the spring tube above it, but also preferably accommodates adjusting rings on its thread. These rings can be used to fine-tune the clearance between the pressure plate and the head plate of an inserted fastener, or to adjust the contact pressure of the fastener's head plate against the roof structure's waterproofing membrane.

[0019] It is particularly advantageous if the spring tube is a hollow cylinder which is at least partially provided with an internal thread and which comprises a lower hollow chamber and an upper hollow chamber, between which a shoulder is formed. In this embodiment, a compression spring is preferably received in the upper hollow chamber and is supported on a bushing received in the lower hollow chamber, wherein the wall of the upper hollow chamber is penetrated by two opposite elongated holes offset by 180° to one another. These serve to accommodate pins or screws in order to fix the adjusting tube inserted into the hollow chamber. This advantageously encapsulates the spring and provides it with sufficiently centered guidance.

[0020] A further advantageous embodiment of the invention provides that the adjusting tube is a tubular rod with a locking device on the head, which has two clamping sleeves offset radially by 180° to one another, each housing a spring-loaded bolt with cams arranged on the free ends of which. By pulling the clamping sleeves, the locking of the adjusting tube with the guide tube arranged above it is released. For this purpose, the guide tube is provided with a grid sleeve and an adapter head, wherein the grid sleeve has a series of bores arranged one above the other, which penetrate the wall of the grid sleeve on both sides linearly on a drilling axis. After the cams have been pulled out of the bores on the grid sleeve by pulling the clamping sleeves, the guide tube can be slid up and down in the adjusting tube in order to adjust the device to the overall length of the fastening element used.

[0021] The advantageous design of the components which form the tubular attachment of the setting head according to the invention allows them to be coaxially adapted to one another, whereby at least in part a telescopic displacement relative to one another is made possible.

[0022] There are various possibilities for advantageously embodying and developing the teachings of the present invention. Reference is made, on the one hand, to the subordinate claims and, on the other hand, to the following explanation of an embodiment of the invention with reference to the drawings.

[0023] The following figures, among others, show the invention during two installation processes. The first installation process describes the phases of an incorrect fastening and the behavior of the inventive installation head. The second installation process explains how the inventive installation head behaves when the screw has anchored correctly in the substrate.

[0024] The drawings show: Fig. 1 the setting head according to the invention in a perspective view, Fig. 2 the setting head according to the invention in an exploded view, Fig. 3 a perspective view of a bell which is part of the setting head, Fig. 4 a bottom view of the bell, Fig. 5 a side view of the bell, Fig. 6 a sectional view of the bell, Fig. 7 a perspective view of a gripper of the bell, Fig. 8 a front view of the gripper, Fig. 9 a top view of the gripper, Fig. 10 a side view of the gripper, Fig. 11 a top view of the belt-like closed tension spring of the bell, Fig. 12 a front view of the closed tension spring of the bell, Fig. 13 a perspective view of the press ram, Fig. 14 a side view of the press ram with adjusting rings, Fig. 15 a bottom view of the press ram without adjusting rings, Fig. 16 a side view of the press ram without adjusting rings, Fig. 17 a sectional view of the press ram without adjusting rings, Fig. 18 a perspective view of the spring tube of the setting head, Fig. 19 a bottom view of the spring tube, Fig. 20 a side view of the spring tube, Fig. 21 a sectional view of the spring tube, Fig. 22 a perspective view of the adjusting tube, Fig. 23 a bottom view of the adjusting tube, Fig. 24 a side view of the adjusting tube, Fig. 25 a sectional view of the adjusting tube, Fig. 25a an enlargement in the area of the clamping sleeve Fig. 26 a perspective view of the guide tube with adapter, Fig. 27 a bottom view of the guide tube, Fig. 28 a side view of the guide tube, Fig. 29 a sectional view of the guide tube, Fig. 30 a perspective view of the screw rod, Fig. 31 a bottom view of the screw rod, Fig. 32 a side view of the screw rod, Fig. 33 a sectional view of the screw rod, Fig. 34 shows the setting tool in its starting position above a deep bead of a steel trapezoidal sheet, Fig. 35 shows how the fastening element has pierced the insulation and is immersed in the deep bead, Fig. 36 which as a result of the Fig. 35 shown phase retracted setting tool, Fig. 37 the phase in which the fastening element is pulled out of the insulation after incorrect fastening, Fig. 38 the setting tool is back in its original starting position, Fig. 39 shows the setting tool in its starting position above a raised bead, Fig. 40 shows how the screw hits the raised bead of the trapezoidal steel sheet, Fig. 41 the screw connection in its first phase, Fig. 42 the screwing in its second phase and Fig. 43 the completed setting process.

[0025] The Fig. 1 and Fig. 2 shows the setting head 1 according to the invention. This comprises a bell 10, a press ram 30, a spring tube 50, an adjusting tube 70, and a guide tube 90. All of the aforementioned components of the setting head 1 are assembled coaxially by screwing or plugging. The longitudinal axes of the coaxially connected setting head components thus also run through the longitudinal axis 11 of the setting head 1.

[0026] The bell 10, which is also in the Fig. 3 to 12, consists of a circular cylindrical sleeve 12 with a stepped collar 14. The sleeve 12 is closed on the side of the collar 14 and is penetrated by a bore 16. The remaining edge forms an open cover 18 for a chamber 20 surrounded by the sleeve 12. The cover 18 is also penetrated by three bores 19 distributed concentrically around the central bore 16.

[0027] The sleeve 12, which is circularly cylindrical in cross-section, has three radially distributed notches 22 running parallel to the longitudinal axis 11, which are open towards the sleeve base 23. Near the sleeve base 23, the sleeve 12 is provided with a circumferential annular groove 24. In the area of the notches 22, the sleeve 12 is penetrated by bores 25, whose axes 26, which run orthogonally but offset from the longitudinal axis 11, each lead through one of the notches 22. The bores 25 each serve as a bearing for an axle bolt 21 ( Fig. 2 and 7 to 10), which is driven through the bores 25 and passes through a gripper 27. This can thereby tilt or pivot about its pivot axis 31. The gripper 27 is inserted into the notches 22 of the sleeve 12 such that the hook 28 formed thereon points towards the chamber 20 and the groove 29 located on the back of the hook 28, in the rest position of the gripper 27, supplements the annular groove 24 of the sleeve 12. The thus pre-assembled bell 10 is enclosed by a tension spring 17, which is inserted into the annular groove 24 of the sleeve 12 or into the groove 29 of the gripper 27 and surrounds the bell 10 together with the gripper 27 in a belt-like manner.

[0028] In Fig. 11 and Fig. 12 shows the tension spring 17. The spring body has means at both ends through which a closure 15 is formed, so that a belt can be formed with the tension spring 17 around the bell 10 and the grippers 27 located therein.

[0029] The press ram 30 is in the Fig. 13 to 17. It is essentially mushroom-head-shaped and comprises a pressure plate 32 and a threaded pin 34 with an external thread 35, onto which the adjusting rings 33 and 36, each with an internal thread 37, can be screwed. The threaded pin 34 is a hollow cylinder and has a hollow chamber 41 that is open at the top and closed on the opposite side by the pressure plate 32.

[0030] The pressure plate 32 is penetrated by a central bore 38 and three radially distributed bores 39. The central bore 38 leads into the hollow chamber 41. The lower adjusting ring 36 serves to adjust the clearance between the pressure plate 32 and the head plate 111 of a fastening element 110 inserted into the bell 10, which Fig. 34 to 43. If the adjusting ring 36 is rotated, the distance between the pressure plate 32 of the press ram 30 and the hook 28 of the gripper 27 changes (see Fig. 34). The upper adjusting ring 33 serves to adjust the depth, ie it determines the contact pressure of the head plate 111 of the fastening element 110 on the sealing membrane 162 of the roof structure to be fastened.

[0031] The Fig. 18 to 21 show the spring tube 50, which comprises a hollow cylinder with a lower hollow chamber 52 and an upper hollow chamber 54. A shoulder 56 is formed between the two hollow chambers 52, 54. The lower hollow chamber 52 has an internal thread 53. A bushing 58 with a central channel 59 is inserted into the lower hollow chamber 52. The T-shaped design of the bushing 58 ensures that the inlet depth in the lower hollow chamber 52 is limited by the shoulder 56, which forms a stop. A compression spring 61 is inserted above the bushing 58 and is supported on the bushing 58. In the area of the upper hollow chamber 54, the wall is penetrated by two opposite elongated holes 63, i.e. offset by 180° to one another.

[0032] The Fig. Figures 22 to 25 show the adjusting tube 70. This consists of a tubular rod 71 with a locking device 72 on the head. The locking device 72 comprises a cap 73 closing the end of the tubular rod 71, on the annular wall 74 of which two clamping sleeves 75 are mounted, radially offset by 180° from one another. The clamping sleeves 75 each have a chamber 76 in which a spring 77 is accommodated, which is enclosed between the rear wall 78 of the clamping sleeve 75 and the flange 81 of a bolt 80. The bolt 80 carries, on the side of the flange 81 facing the interior 82 of the tubular rod 71, a cam 84 which projects into the interior 82 of the rod 71. A ball knob 85 is screwed onto the opposite end of the bolt 80, which sits with its flattened surface 86 on the rear wall 78 of the clamping sleeve 75.

[0033] A plug 87 is inserted into the free end of the rod 71, which plug has a central through-hole 88 and is fastened to the rod 71 by two opposite pins 89, or alternatively by screws.

[0034] The Fig. Figures 26 to 29 show the guide tube 90. The guide tube 90 comprises a grid sleeve 92 and an adapter head 94. The adapter head 94 has stepped shoulders, forming cylindrical collars 95, 96, 97, and 98 of different diameters. These are arranged in a cascade pattern above and below one another. To connect the adapter head 94 to the grid sleeve 92, the grid sleeve 92 has an external thread 93 at its first end, which is screwed into the internal thread 99 of the lower collar 95. The grid sleeve 92 has a series of bores 101 arranged one above the other, which penetrate the wall of the grid sleeve 92 on both sides, i.e., linearly, each lying on a bore axis.

[0035] Each hole 101 is assigned a grid position by numbers. The numbers together form a scale 105 visible on the circumference of the grid sleeve 92, which indicates the length of the usable fastening elements 110. Using the adapter head 94, the guide tube 90 is coupled to a screwdriver (not shown).

[0036] In the Fig. Figures 30 to 33 show the preferred screw rod assembly 130. This comprises the screwdriver bit 135 and a bit extension 140. The bit extension 140 has a rotary drive pin 141 with a hexagonal outer shape at its head end, which is clamped into the drill chuck of a screwdriver (not shown). At its opposite end, the bit extension 140 carries a quick coupling 142, into which the appropriate screwdriver bit 135 is inserted.

[0037] Based on the Fig. Figures 34 to 43 describe the individual phases of the setting process, explaining the respective functional sequences of the setting head according to the invention. Although the setting head 1 is mounted on a hand-held setting tool or an automatic setting tool, only the setting head 1 according to the invention is shown in the figures for the sake of clarity. If the setting head 1 is operated with a hand-held setting tool, a supply magazine is generally not used, since only one fastening element is presented at a time.

[0038] When assembling in an automatic setting device, in which the screwdriver is mounted on a lifting device and the lifting movements are transferred, among other things, to a separating device of a magazine, an ejection device for an already separated fastening element is provided on the magazine so that, in the event of a detected incorrect fastening, this does not block the path for a subsequently presented fastening element.

[0039] To prepare for a setting process, the setting tool is first adjusted to the size of the fastener 110 used. This is done by positioning the adjusting tube 70 with its locking device 72 (see Fig. 1) is moved along the scale 105 of the guide tube 90. By pulling the two ball knobs 85 pre-tensioned inside (see also Fig. 1 and Fig. 25 / 25a) outwards, their cams 84 are pulled out of the bores 101 of the locking sleeve 92 of the guide tube 90, whereby the adjusting tube 70 can be moved freely up and down on the guide tube 90.

[0040] As the applicant has recognized, the head plate 111 of the fastening element 110 must be received in the bell 10 without any play. To do this, one of the fastening elements 110 to be used is pressed with its head plate 111 into the bell 10 from below, displacing the grippers 27 outward. After the head plate 111 has been moved past the hooks 28 of the grippers 27, the grippers snap back, caused by the tension spring 17, and engage under the head plate 111. If the head plate 111 is not seated in the bell 10 without any play, readjustment can be achieved by turning the lower adjusting ring 36.

[0041] To avoid overstretching or insufficient pressure between the head plate 111 of the fastening element 110 and the sealing strip 162, a test installation run is preferably performed. If, after the installation process, the head plate 111 of the fastening element 110 does not rest flat on the sealing strip 162 or is even overstretched, readjustment can be performed by adjusting the upper adjusting disc 33.

[0042] In the Fig. 34 to 45, the tension spring 17, which surrounds the bell 10 with the grippers 27 in a belt-like manner, is not shown in order to be able to better recognize the individual positions of the grippers 27.

[0043] In the Fig. Figure 34 shows the starting position for the subsequent installation process. To explain the functionality of the invention, a fastening location was deliberately chosen here that would result in incorrect fastening. The reason for this is that the installation tool is not positioned above the raised bead 151 of a trapezoidal steel sheet 150, but rather in the area of a deep bead 152. It is precisely at such a position that the invention is effectively used, since the screw of the respective fastening element 110 penetrates the empty space of the deep bead.

[0044] The roof structure is shown identically in the following figures for clarity. A vapor barrier 160 extends over a trapezoidal steel sheet 150. Above this is an insulating material 161, on which a waterproofing membrane 162 is rolled out. The waterproofing membrane 162 can be a bitumen membrane or a plastic film. The fastening element 110 used here comprises a plastic holder 112 with a hollow shaft 114 in which a screw 113 is countersunk. The hollow shaft 114 extends below a head plate 111 formed thereon.

[0045] In the Fig. 35 the setting tool is above the same position as in Fig. 34. However, here the bell 10 rests with its sleeve base 23 flat on the surface of the sealing membrane 162, and the fastening element 110 has penetrated the roof structure, i.e. the sealing membrane 162, the insulation material 161, and the vapor barrier 160. The screw 112 protrudes freely into the deep bead 152 of the trapezoidal steel sheet 150. Thus, the user does not feel any resistance when lowering the screwdriver with the setting head 1, and the user interrupts further pressure application. At this point in time, however, the head plate 111 of the fastening element 110 is not yet released according to the invention. The head plate 111 of the fastening element 110 thus remains enclosed in the bell 10. The locking effect created according to the invention is described in the following steps.

[0046] In the Fig. Figure 36 shows how the setting head 1 is pulled up, but still rests on the sealing strip 162. During the pulling up process, the pressure plate 32 of the pressing ram 30 initially lifts off the head plate 111 of the fastening element 110. The pressing ram 30 moves upward in the chamber 20 of the bell 10, thereby locking the grippers 27 against pivoting. As a result, the hooks 28 of the grippers 27 remain under the head plate 111, and the fastening element 110 cannot emerge from the setting tool. As a result, the fastening element 110 is further pulled upward.

[0047] Without the inventive positioning of the pressing ram in the movement path of the grippers 27, the retaining forces of the roof structure would be sufficient to pull the head plate 111 out of the setting bell 10. This would pivot the grippers 27 into a release position. However, since the pressing ram 30 is positioned in the pivoting path of the grippers 27, a pivoting movement of the grippers 27 is prevented, and they remain in their locked position, so that the head plate 111 and thus the fastening element 110 with the setting head 1 is pulled upwards out of the roof package.

[0048] In Fig. Figure 37 shows how the setting tool is pulled further upwards, thus removing the fastening element 110 from the roof package. The positions of the tool components remain as shown in Fig. 36 shown.

[0049] Once the fastening element 10 has been pulled out of the roof package as shown in Fig. 38, the mechanism of the setting head 1 springs back to its initial position. This is caused by the spring 103, which is arranged on at least one of the pins 100 (see also Fig. 2, Fig. 3 and Fig. 6).

[0050] In the Fig. 39, the setting tool is positioned over a proper setting position. This can be recognized by the raised bead 151 of the trapezoidal steel sheet 150.

[0051] Fig. 40 shows the penetration of the fastening element 110 into the roof package. The screw 113 penetrates the bead apex 153. This creates mechanical resistance, although the sleeve base 23 of the bell 10 is still clearly spaced from the sealing strip 162.

[0052] In Fig. The screwing process begins at 41. The screw 113 pierces the crest 153 of the steel trapezoidal sheet 150 until the bell 10 rests on the sealing strip 162. A gap between the head plate 111 of the fastening element 110 and the sealing strip 162 is still clearly visible.

[0053] The further progress of the setting process is in the Fig. 42. The screw 113 rotates further through the bead apex 153. In the process, the spring 61 is compressed. Due to the increasing pressure, the adjusting tube 70 moves downwards, which can be seen from the position of the pins 89 in the elongated hole 63. According to the path predetermined by the elongated hole 63, the adjusting tube 70 dips into the spring tube 50 and compresses the spring 61. As a result, the axial movement is transmitted to the screw rod 130, and this moves further downwards out of the bell 10 according to the length of the elongated hole 63. As a result, the fastening element 110 is pressed out of the bell 10, and the hooks 27 are displaced outwards, releasing the fastening element 110.

[0054] In the Fig.Figure 43 shows the completion of the setting process. The setting tool is raised with the setting head 1, and the fastening element 110 remains in its anchorage location without any tensile force being exerted on the fastening element 110 when the setting tool is removed. LIST OF REFERENCE SYMBOLS 1 setting head 10 bells out of 10 11 Longitudinal axis of 1, 10, 30, 50, 70, 90 12 sleeves of 10 14 bundles of 10 15 closure of 17 16 central hole in 18 17 Tension spring 18 ceiling of 10 19 radially distributed holes in 18 20 chambers of 10 21 axle bolts 22 incisions in 12 23 case base of 12 24 ring groove in 12 25 holes in 12 26 axis of 25 27 grippers 28 hooks 29 groove in 27 30 press stamps 31 swivel axis of 27 32 printing plate 33 Adjusting ring 34 threaded pins 35 external thread to 34 36 Adjusting ring 37 internal thread of 33 and 36 38 central hole in 32 39 radially distributed holes in 32 41 hollow chambers of 30 50 spring tubes of 1 52 lower hollow chamber of 50 53 internal thread in 52 54 upper hollow chamber of 50 56 paragraph between 52 and 54 58 socket in 52 59 channel in 58 61 compression spring in 50 63 slot in 50 70 adjusting tube from 1 71 bar of 70 72 locking device of 70 73 cap of 72 74 ring wall of 73 75 clamping sleeve of 72 76 chamber of 75 77 springs of 75 78 back wall of 75 80 bolts in 75 81 flange of 80 82 interior of 71 84 cams on 80 85 ball knob 86 flattened area of 85 87 plugs in 82 88 passage opening in 87 89 pens in 82 and 87 90 guide tube 92 grid sleeve of 90 93 external thread of 92 94 adapter head from 90 95 bundle of 94 96 bundle of 94 97 bundle of 94 98 bundle of 94 99 internal threads of 95 100 pens 101 holes in 92 103 spring 105 scale on 90 / 92 110 Fastening element 111 headstock from 110 / 112 112 plastic holders of 110 113 screw of 110 114 hollow shaft of 112 130 screw rods 135 screwdriver bit 140 bit extension 141 rotary drive pin 142 quick coupling 150 steel trapezoidal sheet 151 raised bead of 150 152 deep bead of 150 160 vapor barrier 161 Insulation material 162 waterproofing membrane

Claims

[1] Setting head with a detection of incorrect fastening for setting tools for the mechanical fastening of insulation material (161) and sealing membranes (162) on flat roofs, comprising a tubular attachment which is designed to surround a screw rod (130) of a setting tool which is driven by a screwdriver, in which the tubular attachment comprises a guide tube (90), an adjusting tube (70), a spring tube (50) and a bell (10) which are coaxially connected to one another, wherein the bell (10) is designed to receive a head plate (111) of a fastening element (110), and the bell (10) has pivotable grippers (27) with hooks (28) formed thereon, which are designed to extend with the hooks (28) under the head plate (111) of the fastening element (110) and to engage underneath it, and in a second position outside the path of movement of the (10) emerging head plate (111) to be positioned,in that a pressing ram (30) with a pressure plate (32), which can be lowered by the lifting movement of a screwdriver mounted on the setting head (1), ejects the head plate (111) from the bell (10) and in the process displaces the grippers (27) with their hooks (28), wherein the pressing ram (30) is designed to position itself in the path of movement of the grippers (27) when the setting head (1) is withdrawn from a fastening point without a prior setting process, so that the grippers remain in their locked position relative to the head plate (111) of a fastening element (110) that has not been ejected from the bell (10), in which the pressure plate (32) of the pressing ram (30) prevents a pivoting movement of the grippers (27) and thus the fastening element (110) with the setting head (1) is pulled upwards out of the roof package. [2] Setting head according to claim 1, characterized bythat the bell (10) comprises a cylindrical sleeve (12) which is open at the bottom and surrounds a chamber (20) which is closed at the head end by a cover (18) which has a central bore (16), the wall of the sleeve (12) being penetrated by radially distributed incisions (22) which extend parallel to the longitudinal axis (11) of the setting head (1), in each of which a pivotable gripper (27) is received, the pivot axis (31) of which is aligned orthogonal to the longitudinal axis (11). [3] Setting head according to claim 2, characterized by that the cylindrical sleeve (12) of the bell (10) comprises a radial annular groove (24) which, together with a rear-wall groove (29) of the grippers (27), forms a circumferential groove in which a spring (17) can be received, which surrounds the bell (10) with the grippers (27) inserted therein in a belt-like manner. [4] Setting head according to claim 1, characterized bythat the press ram (30) is mushroom-shaped and a threaded pin (34) is arranged on the pressure plate (32). [5] Setting head according to claim 4, characterized by that adjusting rings (33, 36) for the fine adjustment of contact pressure and / or clearance between the pressure plate (32) and the head plate (111) of a fastening element (110) are arranged on the threaded pin (34). [6] Setting head according to one of the preceding claims, characterized by that the spring tube (50) is a hollow cylinder which is at least partially provided with an internal thread (53) and which comprises a lower hollow chamber (52) and an upper hollow chamber (54), between which a shoulder (56) is formed, and that a compression spring (61) is accommodated in the upper hollow chamber (54) and is supported on a bushing (58) arranged in the lower hollow chamber (52). [7] Setting head according to claim 6, characterized bythat the wall of the upper hollow chamber (54) is penetrated by two opposite elongated holes (63) offset by 180° to each other. [8] Setting head according to one of the preceding claims, characterized by that the adjusting tube (70) comprises a tubular rod (71) with a head-side locking device (72) which has two clamping sleeves (75) which are radially offset by 180° from one another and which each accommodate a bolt (80) which is prestressed by a spring (77) and on the free end of which a cam (84) is arranged. [9] Setting head according to one of the preceding claims, characterized by that the guide tube (90) comprises a grid sleeve (92) and an adapter head (94), wherein the grid sleeve (92) has a series of bores (101) arranged one above the other, which pass linearly through the wall of the grid sleeve (92) on both sides lying on an axis. [10] Setting head according to one of the preceding claims, characterized bythat the guide tube (90), the adjusting tube (70), the spring tube (50) and the bell (10), which form the tubular attachment of the setting head (1) and surround the screw rod (130), are designed to be coaxially screwable or adaptable to one another, means being provided which allow at least partial telescopic displacement relative to one another.

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