Well lid, well covering device and monitoring system

Abstract

The invention relates to a well lid (10) for a well covering device (50), comprising: at least one locking device (20) for locking the well lid (10) at a well frame (40) of the well covering device (50), the locking device (20) having a latch (21) which can be moved between an unlocked position (I) and a locked position (II); and a monitoring device (30) for monitoring the locking, in which the latch (21) can be moved from a locking position (II) into a pressing position (III) in order to fixedly press the well lid (10) to the well frame (40) in use, the monitoring device (30) being designed to identify the unlocking position (I), the locking position (II) and the pressing position (III) of the latch (21).

Description

Technical Field

[0001] The invention relates to a manhole cover for a manhole covering according to the preamble of claim 1. The invention also relates to a manhole covering having such a manhole cover and a monitoring system having such a manhole cover. A manhole cover of the type mentioned at the outset is known, for example, from EP 1 867 791 B1. Background Art

[0002] To cover underground wells, manhole covers are usually used, which are inserted into the well frame. Such manhole covers used on racetracks, such as Formula 1 racetracks, are subject to unusual loads. Due to the special design of the racecars and the high speeds of the racecars, a negative pressure is generated between the bottom of the racecar and the racetrack, which can suck up the manhole cover, so that it is lifted from the well frame and thrown to a certain height, for example onto the opponent's car. This can lead to serious accidents, which are usually associated with a high health risk for the driver.

[0003] For the reasons mentioned, such manhole covers are usually fixed to the manhole frame by welding, screwing or locking before the competition. The fixings are manually checked by the service personnel in a separate step. However, the manual check of each individual fixing is error-prone and time-consuming. In addition, it has been found that welds may break due to high loads and that mechanical fixings may automatically loosen due to vibrations during driving over, for example.

[0004] EP 1 867 791 B1 discloses a manhole cover with a latch and a monitoring device. In the locked position, the latch engages with the manhole frame, thereby preventing the manhole cover from being lifted. The monitoring device monitors the latch and communicates the locked state to a monitoring center. Although in the described manner it is possible to directly inform the service personnel in the monitoring center about the unsecured manhole cover, so that immediate intervention is possible. However, until the service personnel actually intervene, an unsecured manhole cover is a great danger for racing cars and in particular for racing car drivers. Summary of the invention

[0005] The object of the present invention is therefore to improve a manhole cover of the type mentioned at the outset in such a way that safety is increased. The present invention is also based on the object of providing a manhole covering having such a manhole cover and a monitoring system having such a manhole cover.

[0006] According to the invention, this object is achieved by a manhole cover according to claim 1 as well as a manhole covering device according to claim 11 and a monitoring system according to claim 13 .

[0007] Specifically, according to the present invention, the object is achieved by a manhole cover for a manhole covering device. The manhole cover comprises at least one locking device for locking the manhole cover at the manhole frame of the manhole covering device, wherein the locking device has a latch, which can move between an unlocked position and a locked position. The manhole cover also comprises a monitoring device for monitoring the locking. The manhole cover is characterized in that the latch can be moved from the locked position to the pressed position so as to fix the manhole cover to the manhole frame during use, wherein the monitoring device is configured to identify the unlocked position, the locked position and the pressed position of the latch.

[0008] In other words, the invention is based on the idea of ​​providing a manhole cover which can not only be locked by means of a latch but can also be pressed fixedly against the manhole frame. For this purpose, the latch is designed to be movable between an unlocked position, a locked position and a pressed position, wherein the latch moves from the locked position into the pressed position by pressing against the manhole frame.

[0009] By firmly pressing the latch onto the manhole frame in the pressing position, the pressing force between the latch and the manhole frame and between the manhole cover and the manhole frame is increased. As a result, the risk of the latch automatically moving into the unlocking region overcoming the pressing force is reduced. The pressing force also reduces the freedom of movement of the manhole cover, the manhole frame and the latch relative to one another, so that automatic unlocking of the locking device, for example due to vibrations when driving over, is further reduced. In addition, the distance that the latch must travel in order to enter the unlocking region is extended by the pressing position, so that safety is further increased.

[0010] The invention is based on a further concept that a monitoring device for monitoring locking detects the pressed, locked and unlocked positions of the latch. In other words, the monitoring device automatically detects during use whether the latch presses the manhole cover securely onto the manhole frame, or merely locks the manhole cover onto the manhole frame, or does not secure the manhole cover at all. The monitoring device can thus communicate the position of the latch and thus the securing state of the manhole cover to a monitoring center, in order to inform service personnel, for example.

[0011] Thus, the monitoring device detects the transition of the locking bar from the pressed position to the locked position, so that intervention can be carried out before the locking bar leaves the locked position and enters the unlocking region. This further reduces the risk of the locking device unlocking automatically.

[0012] The manhole cover according to the invention is designed for use together with a manhole frame as a manhole cover on a racing track, for example a Formula 1 racing track. The manhole cover can also be used for other manhole covers. It is also possible to use the concept according to the invention without a manhole frame and in general in combination with a manhole cover or the like.

[0013] Preferred embodiments of the invention are specified in the dependent claims.

[0014] In a preferred embodiment of the invention, the locking device has at least one screw that can be manipulated from the outside of the manhole cover, which screw moves the latch between the locking position and the pressing position during use. The screw allows, for example, the latch and thus the manhole cover to be pressed particularly firmly onto the manhole frame with the aid of a corresponding tool. The form fit and self-locking of the screw thread hold the latch in the pressing position and additionally resist automatic unlocking of the locking device. Since the screw can be manipulated from the outside of the manhole cover, the latch can be moved particularly easily and quickly, for example by a service person with the aid of a corresponding tool, between the locking position and the pressing position.

[0015] The screw is preferably adapted to move, in particular pivot, the latch between the unlocked position and the locked position. That is, since the screw also simultaneously causes the latch to move between the unlocked position and the locked position, an additional mechanism for transmitting the movement to the latch is omitted. This simplifies the construction of the manhole cover and reduces the effort for service personnel, since only the tool for actuating the screw has to be provided once. To further simplify the construction, the latch is designed to be pivotable between the unlocked position and the locked position, so that the rotational movement of the screw can be directly transmitted to the latch.

[0016] Preferably, the locking device has a stop, in particular an angle stop, for the latch in the unlocked position and the locked position. The stop ensures that the latch accurately assumes the unlocked position and the locked position. This reduces errors in detecting the position of the latch by the monitoring device, which increases safety. Particularly preferably, the stop for the latch in the locked position also forms a stop for the latch in the pressed position, so as to also ensure accurate positioning of the latch in the pressed position.

[0017] In order to increase the contact pressure between the manhole cover and the manhole frame, it is advantageous if the manhole cover has at least two, preferably three locking devices.

[0018] In order to improve the pressing force between the manhole cover and the manhole frame, the locking device is preferably distributed, especially evenly distributed, in the circumferential direction of the manhole cover. In this way, the pressing force acts distributedly on the circumference, so that the manhole cover is fixedly pressed to the manhole frame from all sides.

[0019] In order to detect the position of the locking bar particularly reliably, it is advantageous if the monitoring device has at least one sensor, in particular an inductive sensor, preferably a Hall sensor, for detecting the position of the locking bar. The inductive sensor measures the change in position of the locking bar, i.e., during use, also detects the position of the locking bar between the unlocked position, the locked position and the pressed position. In this way, the reliability of the detection of the locking bar position can be further increased.

[0020] Preferably, the monitoring device has an antenna, in particular a ceramic antenna, in order to wirelessly transmit information about the position of the locking bar to a monitoring center. This saves communication lines that are complex in terms of their installation and maintenance. The antenna reduces the complexity for installation and maintenance, since it can be quickly and easily installed and removed. This also reduces the probability of errors during the work steps.

[0021] Advantageously, the monitoring device has at least one energy store for autonomous energy supply. Since the power line is obsolete due to the energy store, the expenditure for installation and maintenance can be further reduced in this way. In addition, the energy store can be installed only when required and then removed again, while the power line is permanently exposed to environmental influences. This advantageously reduces the risk of failure of the energy supply.

[0022] In a preferred embodiment of the present invention, the monitoring device is arranged in a protected housing on the inner side of the manhole cover. The housing protects the monitoring device from environmental influences, thereby reducing the risk of failure thereof.

[0023] A parallel aspect of the invention relates to a manhole covering device having a manhole cover as described above and a manhole frame for accommodating the manhole cover, wherein the manhole cover rests on a supporting surface of the manhole frame.

[0024] That is, not only the combination of the manhole cover and the manhole frame is disclosed and claimed, but also the manhole cover itself, that is, the manhole cover independent of the manhole frame. For the effects and advantages of the manhole cover device, reference is made to the embodiment in combination with the manhole cover. That is, the improvement scheme of the manhole cover described above is also disclosed in combination with the manhole cover device.

[0025] In a preferred embodiment of the manhole covering device, the latch of the locking device engages the manhole frame, especially the projection of the manhole frame, from behind in the locking position and presses against the manhole frame, especially the projection of the manhole frame, in the pressing position so that the manhole cover is fixedly pressed to the supporting surface of the manhole frame.

[0026] Another parallel aspect of the invention relates to a monitoring system having at least one of the above-described manhole covering devices and a monitoring center. The monitoring center is designed to receive information about the position of the locking bar from the monitoring device and to visually display the position of the locking bar.

[0027] With regard to the effects and advantages of the monitoring system, reference is made to the implementation scheme incorporating a manhole cover and a manhole covering device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in detail below with reference to the schematic drawings according to the embodiments. In the drawings:

[0029] Figure 1shows a cross section of a manhole covering device having a manhole cover according to one embodiment of the present invention;

[0030] Figure 2 Show Figure 1 A top view of a well covering device in FIG.

[0031] Figure 3 A visual display provided by a monitoring system according to an embodiment of the present invention showing the latch position and securing status of a well cover device;

[0032] Figure 4 A visual display provided by a monitoring system according to an embodiment of the present invention showing a secured well cover on a racing track;

[0033] Figure 5 Show Figure 1 A detail view of the locking device of the well cover device in FIG. 1 , wherein the latch of the well cover device is in the compressed position;

[0034] Figure 6 Show Figure 1 A detail view of a locking device of a well cover device in FIG. 1 , wherein a latch of the well cover device is in a locked position;

[0035] Figure 7 Show Figure 1 A detail view of the locking device of the well cover device in FIG. 1 , wherein the latch of the well cover device is in the unlocked position; and

[0036] Figure 8 Show Figure 4 A visual display of a well cover device in which the well cover device is not fixed. DETAILED DESCRIPTION

[0037] In the figures a preferred embodiment of a manhole cover 10 for a manhole covering device 50 on a racing track, in particular a Formula 1 racing track, is shown. However, the invention can also be used in other situations.

[0038] Specifically, Figure 1 and Figure 2 as well as Figures 5 to 7 A manhole covering device 50 is shown with a manhole cover 10 and a manhole frame 40, wherein the manhole cover 10 is placed on a support surface 41 of the manhole frame 40. The manhole cover 10 comprises a monitoring device 30 and three locking devices 20 evenly distributed on the circumference. The manhole cover 10 can also comprise a plurality of monitoring devices 30 and can also comprise only one locking device 20 or two or more than three locking devices 30.

[0039] exist Figure 12 shows a cross section through one of the three locking devices 20 of a manhole covering device 50. Each locking device 20 has a locking bolt 21 in each case.

[0040] To lock the manhole cover 10 on the manhole frame 40 and cancel the locking, the latch 21 can be moved between the unlocking position I and the locking position II. To firmly press the manhole cover 10 onto the manhole frame 40 during use, the latch 21 can be moved from the locking position II to the pressing position III.

[0041] Figure 1 The latch 21 is shown in the pressing position III. The latch 21 forms an integral component with the manhole cover 10, wherein the latch 21 is arranged at the inner side 12 of the manhole cover 10. In the locking position II and the pressing position III, the manhole frame 40 is arranged between the manhole cover 10 and the latch 21. That is, the latch 21 engages the manhole frame 40 from behind not only in the locking position II but also in the pressing position III.

[0042] In the pressing position III, the latch 21 presses against the manhole frame 40. Since the latch 21 and the manhole cover 10 form an integral component, the manhole cover 10 is fixedly pressed to the manhole frame 40, specifically the bearing surface 41 of the manhole frame 40, by the pressing force of the latch 21 in the pressing position III.

[0043] In order to monitor the locking during use, for example during a game, the monitoring device 30 is designed to detect the unlocking position I, the locking position II and the pressing position III of the bolt 21. That is, the monitoring device 30 monitors the locking during use in that it automatically detects the position of the bolt 21 and communicates it to a monitoring center. Since the transition of the bolt 21 from the pressing position III to the locking position II is detected and communicated, it is possible to intervene, for example by a service person, before the bolt 21 leaves the locking position III and enters a dangerous unlocking area.

[0044] The locking device 20 has a screw 22 that can be actuated from the outside 11 of the manhole cover 10. The screw 22 is inserted from the outside 11 through a through-opening in the manhole cover 10 and protrudes with its screw thread from the through-opening at the inside 12 of the manhole cover 10. The latch 21 is screwed onto the protruding section of the screw 22. For this purpose, the latch 21 has a through-opening with an internal thread that forms a positive fit with the screw thread.

[0045] In use, the screw 22 moves the latch 21 between the locking position II and the pressing position III. To this end, the screw 22 is manipulated from the outside 11 by means of a suitable tool. In this way, the latch 21 can be fixedly pressed onto the manhole frame 40 by tightening the screw 22, i.e., moved from the locking position II to the pressing position III. In order to move the latch 21 back from the pressing position III to the locking position II, the screw connection between the screw 22 and the latch 21 is loosened again.

[0046] The screw 22 is adapted to move, in particular pivot, the latch 21 between the unlocking position I and the locking position II. Specifically, when the screw 22 is manipulated, the latch 21 is rotated along with the screw 22 between the unlocking position I and the locking position II due to the shape fit between the latch 21 and the screw 22.

[0047] That is, the latch 21 forms a twist lock or a screw twist lock, which can be pivoted between an unlocking position I and a locking position II and can be moved between a locking position II and a pressing position III by means of a screw.

[0048] The locking device 20 has stops, in particular angle stops, for the latch 21 in the unlocking position I and the locking position II, respectively. The stops are arranged offset from each other at an angle of approximately 90° relative to the axis of the screw 22. The stop for the latch 21 in the locking position II also forms a stop for the latch 21 in the pressing position III. The latch 21 has a projection 23, which is designed to cooperate with the stop in a force-transmitting manner in the unlocking position I, the locking position II and the pressing position III.

[0049] The stop thus limits the pivoting movement of the latch 21 between the unlocking position I and the locking position II. That is, if the screw 22 is manipulated or turned so that the latch 21 is pivoted from the unlocking position I toward the locking position II, the latch 21 hits the corresponding stop in the locking position II so that the latch exactly takes up the locking position II. Since the continuation of the pivoting movement of the latch 21 in the direction is blocked by the stop, when the screw 22 is further turned, the latch 21 is screwed toward the manhole cover 10 until the pressing position III. The movement of the latch 21 from the pressing position III via the locking position II to the unlocking position I takes place in a similar manner.

[0050] The monitoring device 30 has a sensor 31, in particular an inductive sensor, such as a Hall sensor. The sensor 31 is configured to detect a magnet 35 and identify its position or orientation. For this purpose, the sensor 31 is arranged on the inner side 12 of the manhole cover 10 so that when the latch 21 is adjusted or moved, the position of the sensor relative to the manhole cover 10 does not change. Instead, the magnet is arranged on the latch 21 so that when the latch 21 is moved, the magnet 35 moves with it.

[0051] The sensor 31 measures the change in inductance or its properties during use due to the change in orientation relative to the magnet 35. The latch 21 and thus the magnet 35 repeatedly occupy the same position relative to the sensor 31 in the unlocked position I, the locked position II and the pressed position III during use. That is, in the latched positions I, II, III, the measurement results are known in advance, so that it is possible to identify the latched positions I, II, III. Based on the same principle, the sensor 31 also identifies the position of the latch 21 between the previously known latched positions I, II, III during use.

[0052] As long as the unlocking position I, the locking position II and the pressing position III are detected, other sensors can be used.

[0053] The monitoring device 30 has an antenna 32, in particular a ceramic antenna 32. The antenna 32 is arranged centrally on the inner side 12 of the manhole cover 10, so that the distance to the outer side 11 of the manhole cover 10 is minimal. The use of other antennas and their arrangement is possible.

[0054] In use, the signal of the sensor 31, i.e. the information about the position of the latch 21, is transmitted wirelessly to the monitoring center by means of the antenna 32. The small distance from the outer side 11 reduces the shielding effect of the manhole cover 10, so that the signal transmission from the antenna 32 through the manhole cover 10 to the monitoring center is stable. Signal transmission by means of a line, such as a communication line, is also possible.

[0055] The signal of the sensor 31 is processed by the electronic device 36 of the monitoring device 30 for signal transmission. Specifically, the electronic device 36 converts the signal of the sensor 31 into a NB-IoT (Narrowband Internet of Things) signal so that, for example, a racing car radio is not disturbed by the signal transmission.

[0056] The monitoring device 30 has an energy store 33 for autonomous energy supply, wherein the energy store 33 in the embodiment shown forms an electrical energy store, in particular a battery. Other energy stores, such as batteries, are possible. The energy store 33 is arranged in a waterproof barrier of the monitoring device 30 .

[0057] The energy storage device 33 supplies all electrical components of the manhole cover 10 with electrical energy autonomously during use. For this purpose, the energy storage device is loaded in a full or fully charged state when necessary, for example before a game, and then removed again to recharge the energy storage device for the next use. In this way, a reliable energy supply of all electrical components, especially system-related components, is ensured during use, for example during a game. In addition, this makes it possible to perform regular and simple maintenance of the energy storage device 33 before each use, thereby reducing the risk of failure during use.

[0058] The monitoring device 30 is arranged in a protected housing 34 on the inner side 12 of the manhole cover 10. For this purpose, the manhole cover 10 has a housing receptacle 13, which is designed to protrude from the inner side 12 of the manhole cover 10 in a tube-shaped manner and is arranged centrally relative to the manhole cover 10. The cylindrical housing 34 of the monitoring device 30 is arranged in the housing receptacle 13. The housing 34 forms a protected receiving space for the components of the monitoring device 30, wherein the housing surrounds the antenna 32, the electronic device 34 and the energy storage device 33.

[0059] In order to lift the manhole cover 10 from the manhole frame 40 and place it on the manhole frame 40 in the unlocked state, two tool receptacles 14 for corresponding tools, for example hooks, are provided on the outer side 11 of the manhole cover 10 .

[0060] The screws 22 of the locking device 20 each have a screw head, which is arranged in a respective groove of the manhole cover 10 and is substantially flush with the outer side 11 of the manhole cover 10. That is, the screw heads of the screws 22 are arranged sunken in the manhole cover 10 so that the outer side 11 is designed as flat as possible so as not to affect the passing of, for example, a racing car.

[0061] The manhole cover 10 has a substantially circular outer contour which is delimited on the inner side 12 by a circumferential, substantially annular supporting surface 15 of the manhole cover 10 . The manhole cover 10 rests with its supporting surface 15 on a supporting surface 41 of a manhole frame 40 .

[0062] The manhole frame 40 has a laterally circumferential frame wall 43. The frame wall 43 forms a connection piece which is closed on the side facing away from the manhole by the manhole cover 10. On the side facing the manhole, the frame wall 43 transitions into a radially outwardly extending annular frame bottom 44.

[0063] The manhole frame 40 has a projection 42. The projection 42 is formed in a circumferential manner on the inside at the surrounding frame wall 43. That is, the projection 42 extends radially inward from the frame wall 43, wherein the projection has a substantially annular geometry. A support surface 41 is arranged on the side of the projection 42 facing away from the manhole, on which the manhole cover 10 is placed. The latch 21 of the locking device 20 engages the projection 42 of the manhole frame 40 from behind in the locking position II and the pressing position III, so that the projection 42 of the manhole frame 40 is arranged between the latch 21 and the manhole cover 10.

[0064] In the pressing position III, the latch 21 presses against the projection 42 in such a way that the manhole cover 10 is fixedly pressed against the supporting surface 41 of the manhole frame 40. That is, the projection 42 is pressed together by the latch 21 and the manhole cover 40. Here, the pressing force can be adjusted by the screw 22.

[0065] A sealing device 45 is provided between the manhole cover 10 and the manhole frame 40, specifically the projection 42 of the manhole frame 40, and is formed circumferentially along the projection 42. The sealing device 45 can also be formed differently. A manhole cover device 50 without a sealing device between the manhole cover 10 and the manhole frame 40 is also possible.

[0066] exist Figure 2 Shown in Figure 1 50 in a top view. The substantially circular manhole cover 10 is arranged in a manhole frame 40, wherein the annular manhole bottom 44 surrounding the frame wall 43 is clearly visible in the top view. Three locking devices 20 evenly distributed on the circumference can be seen. The two tool holders 14 arranged opposite each other are also clearly visible.

[0067] The following is a description of the operation of a monitoring system for a racetrack, in particular the Formula One racetrack in Las Vegas, according to an exemplary embodiment of the invention. The monitoring system comprises a plurality of, in particular 14, of the previously described well covering devices 50 and a monitoring center. The monitoring center is configured to receive information about the position of the latch 21 from the monitoring device 30 and to visualize the position of the latch 21.

[0068] exist Figure 3 27 different combinations of the three latch positions I, II, III are possible, wherein the three latch positions I, II, III are in the same manner as the three latch positions I, II, III. Figure 3 Seven of these combinations are shown in FIG. 1 (represented by seven pie charts).

[0069] Each combination of the three latch positions I, II, III forms a fixed state of the well cover 50 or the manhole cover 10, wherein the well cover 50 is in an unlocked state I, a locked state II or a pressed state III (indicated by the three circles above the pie chart). Here, when at least one of the three latches 21 is in the unlocked position I, the well cover 50 is in the unlocked state I. If none of the three latches 21 is set in the unlocked position I and at least one of the three latches 21 is set in the locked position II, the well cover 50 is in the locked state II. Only when all three latches 21 are in the pressed position III, the well cover 50 is in the pressed state III and is thus fixed. Otherwise, the well cover 50 is not fixed.

[0070] Figure 4 A visual display provided by a monitoring system showing the fixing state of the well cover 50 on the racetrack. Since all well covers 50 are in the pressed state III, i.e. fixed, the racetrack is open for use, e.g. for racing (indicated by the state "OK"). In this case, all latches 21 are in the pressed position III.

[0071] exist Figure 5 ,Right now Figure 1 In the detailed view of the locking device 20 of the manhole cover 50 in FIG. 1 , the latch 21 is shown in the pressed position III. Since the latch 21 engages the projection 42 of the manhole frame 40 from behind and is simultaneously pulled toward the manhole cover 10 by the screw 22, the latch 21 is pressed against the projection 42 of the manhole frame 40, so that the manhole cover 10 is fixedly pressed onto the supporting surface 41 of the manhole frame 40. Here, the latch 21 is arranged with its projection 23 in a cuboid recess on the manhole cover 10.

[0072] The magnet 35 is held directly below the sensor by pressing the latch 21 against the projection 42 of the well frame 40. As a result, the distance between the magnet 35 and the sensor 31 is minimal, so that the distance can be clearly associated with the pressed position III of the latch 21. The pressed position III of the latch 21 is thus identified by detecting the previously known, clear distance.

[0073] The bolt 21 moves from the tensioning position III into the locking position II by loosening the screw connection between the screw 22 and the latch 21, for example due to vibrations caused by a racing car driving over the manhole cover 50 or by actuating the screw 22 with a corresponding tool. Since the latch 21 continues to rest with its projection 23 in the cuboid recess on the manhole cover 10, a pivoting movement of the latch 21 about the axis of the screw 22 is prevented.

[0074] Figure 6 Shown in locked position II Figure 1 It can be clearly seen that the latch 21 in the locking position II continues to engage the projection 42 of the manhole frame 40 from behind, so that the manhole cover 10 continues to be locked on the manhole frame 40. However, in the locking position II, the latch 21 does not press against the projection 42 of the manhole frame 40, but rests essentially loosely against the projection 42.

[0075] Due to the movement of the latch 21 from the pressed position III into the locked position II (indicated by the downwardly pointing arrow), the distance between the magnet 35 and the sensor 31 increases compared to the pressed position III. Since this increased distance can also be clearly associated with the locked position II of the latch 21 due to the structure, it is possible to detect the locked position II of the latch 21 by detecting this distance.

[0076] If the latch 21 is moved from the locked position II to the unlocked position I by further loosening the screw connection between the screw 22 and the latch 21, the latch 21 is lifted from the projection 42 of the manhole frame 40. In the process, the latch 23 moves away from the manhole cover 10 until the projection 23 of the latch is completely released from the cuboid recess on the manhole cover 10. Since the cuboid recess on the manhole cover 10 now no longer resists the pivoting movement of the latch 21, the latch 21 pivots about the axis of the screw 22 until it abuts against the stop for the latch 21 in the unlocked position I.

[0077] The latch 21 in the unlocked position I is Figure 7 Since the latch 21 no longer engages the projection 42 of the manhole frame 40 from behind, the locking device 30, ie the manhole cover 10 or the manhole covering device 50, is unlocked.

[0078] Compared to the locked position II, the distance between the magnet 35 and the sensor 31 is further increased by the pivoting movement of the latch 21 from the locked position II to the unlocked position I. Since the magnet 35 is arranged at this distance from the sensor 31 only in the unlocked position I due to the structure, the unlocked position I of the latch 21 can be detected by detecting the distance.

[0079] Figure 8 Show Figure 4 In the visual display, one of the well covering devices 50 is in the locked state II, i.e. not fixed. The remaining well covering devices 50 are equivalent to Figure 4 A visual display of the device being fixed in the compressed state III.

[0080] Because with Figure 4In contrast, not all shaft covering devices 50 are now in the pressed state III or are fixed, so the racetrack is not open for use, for example for racing (indicated by the status "not OK"). The monitoring center informs the responsible service personnel in the described manner, and the service personnel can immediately intervene, for example interrupt the race. For this purpose, the monitoring center can issue an alarm.

[0081] Since the unsecured manhole cover 50 is in the locked state II, i.e. all three latches 21 engage the manhole frame 40 from behind in the locked position II, the manhole cover 10 is prevented from being lifted from the manhole frame 40. Thus, the informed service personnel can still intervene before one of the three latches 21 leaves the locked position III into the dangerous unlocked region and the manhole cover 10 can be lifted.

[0082] Reference numerals list

[0083] 10. Manhole Cover

[0084] 11 Outer side

[0085] 12Inside

[0086] 13 Shell accommodating mechanism

[0087] 14 Tool storage mechanism

[0088] 15 Supporting surface of manhole cover

[0089] 20 Locking device

[0090] 21 Latch

[0091] 22 screws

[0092] 23 Latch protrusion

[0093] 30 Monitoring device

[0094] 31 Sensors

[0095] 32 antennas

[0096] 33 Energy storage device

[0097] 34 Shell

[0098] 35 Magnets

[0099] 36 Electronic devices

[0100] 40 well frame

[0101] 41 Supporting surface of well frame

[0102] 42 protrusion of well frame

[0103] 43 frame wall

[0104] 44 frame bottom

[0105] 45 Sealing mechanism

[0106] 50-well covering device

[0107] I unlock position, unlock state

[0108] II locked position, locked state

[0109] III. Compression position, compression state

Claims

1. A manhole cover (10) for a well covering device (50), the manhole cover comprising: at least one locking device (20) for locking the manhole cover (10) at the manhole frame (40) of the manhole covering device (50), wherein the locking device (20) has a latch (21) which is movable between an unlocked position (I) and a locked position (II), and - a monitoring device (30) for monitoring the locking, It is characterized in that The latch (21) is movable from the locking position (II) to the pressing position (III) so as to fix the manhole cover (10) to the manhole frame (40) during use, wherein the monitoring device (30) is configured to identify the unlocking position (I), the locking position (II) and the pressing position (III) of the latch (21).

2. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The locking device (20) has at least one screw (22) which can be manipulated from the outside (11) of the manhole cover (10), and which, in use, moves the latch (21) between the locking position (II) and the pressing position (III).

3. The manhole cover (10) according to claim 2, It is characterized in that The screw (22) is adapted to move, in particular pivot, the latch (21) between the unlocked position (I) and the locked position (II).

4. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The locking device (20) has a stop, in particular an angular stop, for the locking bar (21) in the unlocked position (I) and the locked position (II).

5. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The manhole cover (10) has at least two, preferably three locking devices (20).

6. The manhole cover (10) according to claim 5, It is characterized in that The locking devices (20) are arranged distributed, in particular evenly distributed, in the circumferential direction of the manhole cover (10).

7. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The monitoring device (30) has at least one sensor (31), in particular an inductive sensor (31), preferably a Hall sensor (31), for detecting the position of the locking bar (21).

8. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The monitoring device (30) has an antenna (32), in particular a ceramic antenna (32), in order to wirelessly transmit information about the position of the locking bar (21) to a monitoring center.

9. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The monitoring device (30) has at least one energy store (33) for an autonomous energy supply.

10. A manhole cover (10) according to any one of the preceding claims, It is characterized in that The monitoring device (30) is arranged in a protected housing (34) on the inner side (12) of the manhole cover (10).

11. A manhole covering device (50), comprising a manhole cover (10) according to any one of the above claims and a manhole frame (40) for accommodating the manhole cover (10), wherein the manhole cover (10) is placed on a supporting surface (41) of the manhole frame (40).

12. The well covering device (50) according to claim 11, It is characterized in that The latch (21) of the locking device (20) engages the manhole frame (40), in particular the protrusion (42) of the manhole frame (40), from behind in the locking position (II), and presses against the manhole frame (40), in particular the protrusion (42) of the manhole frame (40) in the pressing position (III), so that the manhole cover (10) is fixedly pressed onto the supporting surface (41) of the manhole frame (40).

13. A monitoring system comprising at least one well covering device (50) according to claim 11 or 12 and a monitoring center, wherein the monitoring center is configured to receive information about the position of the latch (21) from the monitoring device (30) and to visualize the position of the latch (21).

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