Device for securing a shaft against being pushed out of a shaft receptacle radially encompassing the shaft, shaft and mobile traffic sign

Abstract

The invention relates to a device (100) for securing a shaft (200) against being pushed out of a shaft receptacle (310) radially encompassing the shaft (200), wherein the device (100) comprises an expander element (110) and a stop (120), and wherein the device (100) is designed to be attached to the inside of the shaft (200) by means of the expander element (110). The device (100) according to the invention is characterized in that the stop (120) has a radially larger cross-section than the expander element (110). The invention further relates to a corresponding shaft (200) and a corresponding mobile traffic sign.

Description

The invention relates to a device for securing a shaft against being pushed out of a shaft receptacle radially enclosing the shaft according to the preamble of claim 1, as well as to a corresponding shaft and a corresponding mobile traffic sign.Road signs as a component of the traffic infrastructure, in particular for influencing road traffic, but also for influencing rail traffic and in-house ship traffic, are generally known.The known traffic signs are designed, for example, as light signal systems or, in a comparatively simpler embodiment, as traffic signs. Depending on the desired influence on the road traffic, the traffic signs can be designed differently, differ in their shape and color, in order to represent a symbolic instruction to the road users.Traffic signs generally consist for this purpose of a panel having the symbolic instruction and a post-like shaft supporting the panel and are usually arranged stationary on the road edge. The posts or shafts are thereby firmly anchored in the ground.In the prior art, different possibilities are known, in particular for reliably anchoring the traffic signs arranged on posts or shafts in the ground by means of their lower shaft end.In this connection, U.S. Pat. No. 5,326,352 A describes a shield holder for anchoring in the ground, wherein the shield holder has an inner expandable part at the lower post end, which can be expanded in the underlying surface in order to hold the shield holder securely in the intended position in the underlying surface.It is also known from U.S. Pat. No. 6,282,861 B1 and U.S. Pat. No. 2001 0 027 626 A1 to anchor a parking meter to the ground by adhesive bonding.US 4 798 273 A and US 4 986 406 A disclose mounts for parking meters on a support pole by expanding an expander member of the parking meters in the respective support pole to create a clamping action.ES 1 072 676 U describes a device for anchoring a sign in the ground with a securing means.KR 102 282 598 B1 likewise describes a device for anchoring a shield holder in a stationary manner in the ground. For this purpose, the shield holder has an expander at the lower end of the post to be anchored, which expander can be expanded, for example, by screwing in a screw, in order to generate a clamping effect in the underlying surface.In addition, however, mobile traffic signs are also known which are used, in particular as required, for example at construction sites in the road area, short-term shut-offs or for warning of obstacles and hazards. In this case, analogously to the stationary traffic signs, these mobile traffic signs generally consist of a panel arranged at the upper end of a shaft and of the shaft carrying the panel. However, these mobile traffic signs are not anchored in the ground in order to enable rapid installation and removal. Instead, the mobile traffic signs are generally arranged in a floor plate weighing about 35 kg in order to ensure a safe standing at the installation location.However, since mobile traffic signs of this type are not suitable for permanent attachment to the ground, on principle, they are often the target of vandalism, in particular they are often removed and stolen without authority. In addition, these are susceptible to strong wind in particular. Thus, shields fastened in this way can fall over when exposed to strong wind, causing damage to the object or even leading to injuries to passers or workers.It is therefore an object of the present invention to propose an improved device for securing a shank against being pushed out of a shank receptacle radially enclosing the shank.This object is achieved according to the invention by the device for securing a shank against being pushed out of a shank receptacle radially enclosing the shank according to claim 1. Advantageous embodiments and further developments of the invention are evident from the dependent claims.The invention relates to a device for securing a shank against being pushed out of a shank receptacle radially comprising the shank, wherein the device comprises an expander element and a stop and wherein the device is configured to be fastened to an inner side of the shank by means of the expander element.Thus, a device is provided which secures a shaft held in a shaft receptacle against being pushed axially out of the shaft receptacle. This can contribute, on the one hand, to preventing unauthorized removal. In addition, this can improve the protection against weather influences, in particular strong wind.The shaft receptacle is preferably adapted to the cross-sectional geometry of the shaft. That is, in the case of a round shank, the shank receptacle is also correspondingly formed with a round cross section of approximately the same size as the shank.In the case of a rectangular shaft, on the other hand, shaft receptacle is formed with a rectangular cross section of approximately the same size as the shaft. The same applies to oval, triangular, or polygonal shafts or shaft receptacles.As described, the device is preferably designed such that it secures the shaft against axial pushing out in an axial direction. It can, however, particularly preferably also be designed to secure the shaft against axial pushing out in two axial directions.For this purpose, the device according to the invention is advantageously arranged in an axial end of the shaft. Particularly advantageously, a device according to the invention can be arranged in each axial end of the shaft.By means of the expander element, the device can be arranged on an inner side of the shaft. The expander element can advantageously be radially expanded in order to come into contact with the inner side of the shaft and to generate an interaction fixing the device in the shaft.For this purpose, the shaft is advantageously at least partially designed as a hollow shaft, namely in the region of the device, so that the expander element can be inserted into the shaft and can be arranged there on the inner side of the shaft.Particularly advantageously, the shaft is designed completely as a hollow shaft.According to the invention, it is provided that the stop has a radially larger cross section than the expander element. The stop is advantageously arranged in an axial end of the expander element and, owing to its larger radial dimension, represents a form-fit limitation beyond which the device cannot be inserted into the shaft.As a result, it also becomes impossible, owing to positive movement restrictions, to move the shaft with the device or with the stop out of the shaft receptacle, because the stop is also larger than the shaft receptacle and as a result cannot be moved by the shaft receptacle. The stop thus limits the movability of the shaft in the shaft receptacle in an axial direction.Preferably, the shaft can also have two devices according to the invention, namely one at each axial end. As a result, it is possible to reliably prevent the shank from being pushed out in both axial directions. The shaft is thus secured in the shaft receptacle in a form-fitting manner against being pushed out in both possible directions.If the shaft has a device according to the invention at each axial end, the shaft is also designed as a hollow shaft at least in the region of the two axial ends. Advantageously, the shaft can be designed completely as a hollow shaft.It is preferably provided that the expander element is configured to be fastened to the inner side of the shaft by causing a clamping effect on the inner side of the shaft in an expanded state. In the expanded state, the radial outer side of the expander element thus comes into contact with the inner side of the shaft. Depending on the force which the expander element exerts on the inner side of the shaft, a strong clamping force can be produced which is in particular so great that the expander element-and thus the device-cannot be removed from the shaft without auxiliary means.Advantageously, the expander element has a comparatively rough and non-sliding surface.Alternatively preferably, it is provided that the expander element is designed to be fastened to the inner side of the shaft by engaging in a form-fit element on the inner side of the shaft in an expanded state. The radial expansion movement of the expander element can namely be used to produce a form fit with a suitable counter-shape on the inner side of the shaft in a comparatively simple manner, provided that the shaft is correspondingly provided for use according to this embodiment.For example, it can be provided that the expander element has a groove which, in the expanded state of the expander element, engages over a tongue on the inner side of the shank. Thus, a positive spring-groove connection can be produced by moving a groove preferably running radially around the expander element radially outwards by the expansion movement of the expander element and thus overlapping the spring on the inner side of the shaft.Alternatively, it can be provided that the expander element has a tongue which, in the expanded state of the expander element, engages in a groove on the inner side of the shaft. In this case, the expander element thus has a spring which preferably runs radially around the expander element and is moved radially outwards by the expansion movement of the expander element and therefore engages in the groove on the inner side of the shank.The expander element can be preferably expanded by the expander element comprising an expandable outer body and an inner body movable in the outer body. The inner body can be moved completely or partially into the outer body. Accordingly, it is also conceivable that the inner body can be moved completely out of the outer body.Due to the geometric dimensions of the inner body and the outer body, the inner body advantageously brings about an increasing spreading effect on the outer body the further it is moved into the outer body. Due to the spreading effect, the outer body of the expander element expands.It is thus advantageously provided that the expander element is designed such that the outer body expands radially when the inner body is moved into the outer body.It is preferably provided that the inner body consists at least partially of metal, in particular of steel. As a result, the inner body is comparatively hard and optionally also more stable than the outer body, so that the inner body can exert comparatively large spreading forces on the outer body without itself being deformed markedly or even being damaged.Advantageously, the inner body can be at least partially conical. In particular in conjunction with a cylindrical opening for receiving the inner body in the outer body, the inner body can then increasingly spread the outer body the further it is moved-first with its tip-into the outer body.Alternatively preferably, it can be provided that the outer body has a cuboidal opening for receiving the inner body. The inner body can then advantageously be at least partially pyramidal in shape. In this case too, the inner body causes an increasing expansion of the outer body and thus an increasing expansion of the outer body, the further it is moved-first with its tip-into the outer body.In order to effectively ensure the expansion effect of the inner body when the inner body is moved into the outer body, it is advantageously provided that a maximum radial circumference of the inner body is greater than a maximum inner circumference of the opening for receiving the inner body in the relaxed state of the outer body. Thus, during the movement of the inner body--with its tip first--into the outer body, the inner body causes an increasing expansion of the outer body and thus an increasing expansion.It is preferably provided that the outer body is radially at least partially slotted in order to promote a radial expansion movement of its walls surrounding the opening. The slots can advantageously extend in the axial direction and thus significantly simplify an expansion capacity of the outer body. The slots extend in particular, starting from an axial end of the outer body, over the major part of the axial length of the outer body. However, shorter slots are also conceivable and preferred. The axial end at which the slots begin advantageously faces the inner body, so that the inner body can effectively bring about an expansion movement of the outer body from the beginning when it moves into the outer body.For example, two slits, three slits, four slits, five slits, or six slits may be provided. More than six slots are also conceivable and preferred.It is preferably provided that the outer body is designed to be elastic. This facilitates the expansion capability of the outer body. In addition, in the case of an elastic configuration, the outer body also pulls back automatically into its original shape when the inner body is moved out of the outer body. Thus, the device can be easily removed from the shaft when the inner body is moved out of the outer body. This allows the device to be used multiple times.It is preferably provided that the outer body has a honeycomb structure. The term "honeycomb structure" in the sense of the invention is understood to mean a non-massive structure which has a number of regular or irregular cavities. The cavities can be round, rectangular or hexagonal. This results in the advantage that the elasticity of the outer body is increased, since a honeycomb structure is more flexible than a massive structure due to the hollow spaces. In addition, the weight of the outer body and thus also the total weight of the device are reduced.It is preferably provided that the outer body consists of a plastic. Plastic offers good elastic properties, on the one hand, in order to promote the required expansion capacity of the outer body, and also high robustness with respect to environmental influences, low weight and low production costs, on the other hand.It is preferably provided that the stop at an axial end of the expander element is held on the expander element by an expansion pin. The expansion pin is preferably guided through an opening of the stop and projects through this opening into the expander element. With a pin head of the expansion pin, the expansion pin advantageously abuts the stop. The pin head is preferably larger than the opening of the stop, so that the pin head bears positively against the stop and cannot be moved through the opening. As a result, the expansion pin can engage, for example, in the inner body and bring about a movement of the inner body into the outer body. The force required for this can be supported by the expansion pin on the stop via the pin head.It is preferably provided that the expansion pin is designed as a screw. Screws are widely available, comparatively cost-effective and at the same time load-bearing and robust, since they are usually made of steel.Particularly advantageously, an expansion pin designed as a screw can engage with its external thread into an internal thread of the inner body. Thus, a force can be exerted on the inner body by the expansion pin in a comparatively simple manner, namely by means of a screwing movement, said force moving said inner body into the outer body and thereby expanding the outer body. By means of the screw thread, in the sense of a gear reduction, a reduction of the force, which is predetermined by the thread pitch and is required for the movement of the inner body into the outer body, can be effected. In particular, the expansion movement of the outer body occurring in this case can namely require a comparatively large force.As already described, this force can be advantageously supported by the expansion pin on the stop via the pin head.Advantageously, at least the internal thread of the inner body is metallic, in particular made of steel.The stop is preferably disk-shaped. In its radial center, it advantageously has an opening for the expansion pin, wherein the opening is formed with respect to its diameter in such a way that although the pin body-or, in the case of a configuration as a screw, the threaded part of the screw-fits through the opening, the pin head does not fit through the opening.The stop is preferably made of steel or a steel alloy. Steel or steel alloys are robust, resilient and at the same time comparatively cost-effective. In particular, the stop can be galvanized in order to increase the corrosion resistance of the stop to weathering influences.Alternatively preferably, the stop can consist of brass or a brass alloy. In this case, the stopper does not need to be galvanized to have high corrosion resistance. A configuration made of brass also generally has a sufficiently high mechanical load capacity.The invention further relates to a shaft comprising a device according to the invention.Advantageously, the shaft may also comprise two devices according to the invention, in particular one at each axial end.The shaft can advantageously be designed as a round shaft or as a shaft with an angular cross section. For example, the shank may have a triangular, quadrangular, pentagonal, hexagonal or octagonal cross section.Finally, the invention also relates to a mobile traffic sign comprising a shaft according to the invention. The mobile traffic sign further comprises a panel which has a symbolic instruction for influencing the traffic flow. The shape of the panel and the instruction applied advantageously correspond to a legally prescribed representation in order to produce a desired effect on the traffic flow.The traffic flow is preferably a road traffic flow, but it can also be rail traffic or in-house traffic.It is preferably provided that the traffic sign has a base plate with a shaft receptacle radially surrounding the shaft. The base plate preferably represents the lower part of the mobile traffic sign which is placed on the ground. The base plate advantageously has a comparatively high mass, in particular about 35 kg, in order to be able to hold the traffic sign securely and also to be able to secure it against falling over in the case of wind or storms. The mobile traffic sign is also protected to a certain extent from unauthorized removal.The base plate can have a plurality of shaft receptacles or openings which are suitable for receiving different shaft diameters or different shaft shapes, for example round or angular.The base plate advantageously has a plastic sheathing which surrounds a metallic inner part. As a result, the base plate can have a high density and at the same time be reliably protected against weather influences.By securing the shaft of the mobile traffic sign by means of the device according to the invention against being pushed out of the shaft receptacle of the base plate, it can be ensured that the mobile traffic sign is not removed from the base plate by unauthorized persons and is removed unauthorizedly.Even if the device prevents the pushing out in only one axial direction, pushing out in the other axial direction is however likewise impossible, since the panel at the upper shaft end likewise prevents pushing out from the shaft receptacle. Thus, without a suitable tool for releasing the device from the shaft, it is not possible to remove the traffic sign from the shaft receptacle.It is preferably provided that the traffic sign has two base plates stacked one above the other, each with a shaft receptacle radially enclosing the shaft. This doubles the weight by which the mobile traffic sign is protected against falling over or unauthorized removal.If the mobile traffic sign is to be removed unauthorized, an unauthorized person must namely remove not only the weight of the actual traffic sign but also the weight of two base plates, in total preferably about 80 kg. This significantly complicates unauthorized removal of the road sign from the location of its placement.The invention is explained below by way of example with reference to embodiments shown in the figures.The following are shown: FIG. 1 shows, by way of example and schematically, a possible embodiment of a device according to the invention for securing a shank against being pushed out of a shank receptacle radially enclosing the shank, FIG. 2 shows, by way of example and schematically, a further possible embodiment of a device according to the invention for securing a shank against being pushed out of a shank receptacle radially enclosing the shank, FIG. 3 shows, by way of example and schematically, a shaft with the device, and FIG. 4 shows, by way of example and schematically, the shaft together with the device after arrangement in a base plate of a mobile traffic sign.Identical items, functional units and comparable components are denoted by the same reference numerals across the figures. These objects, functional units and comparable components are identical in terms of their technical features, unless the description explicitly or implicitly reveals otherwise.FIG. 1 shows, by way of example and schematically, a possible embodiment of a device 100 according to the invention for securing a shank 200 (not shown in FIG. 1 ) against being pushed out of a shank receptacle 310 radially enclosing the shank 200 (likewise not shown in FIG. 1 ).As can be seen, the apparatus 100 comprises an expander element 110 and a stop 120. The device 100 is configured to be fastened to the inner side of the shaft 200 by means of the expander element 110, in that the expander element 110 in an expanded state causes a clamping effect on the inner side of the shaft 200, which makes removal from the shaft 200 impossible without further aids.For this purpose, the expander element 110 in turn comprises an expandable outer body 111 and an inner body 112 movable in the outer body 111. The outer body 111 has, for example, a square cross section and expands radially when the inner body 112 is moved further into the outer body 111, since the inner body 112 then exerts a spreading force on the outer body 111 from the inside, which leads to the outer body 111 expanding radially. In order to be able to move the inner body 112 into the outer body 111, the outer body 111 has an opening, not shown in FIG. 1, the inner circumference of which is however smaller than the maximum outer circumference of the inner body 112, so that the latter can, as described, bring about a spreading force on the outer body 111.In order to promote the expansion capability of the outer body 111, it is made of an elastic plastic and has a honeycomb structure. The honeycomb structure is, as can be seen, rectangular or cuboidal. Hollow cuboids and a full cuboid are arranged alternately in each case. In addition, the outer body has a slot 113 on each of its four radial sides, as a result of which the extensibility of the outer body 111 is likewise promoted.As can be further seen, the stop 120 is held at an axial end of the expander element 110 by an expansion pin 130 on the expander element 110. The expansion pin 130 is designed as a screw 130, for example, of which only the pin head or screw head can be seen in FIG. 1. The screw 130 is guided through an opening of the stop 120 and rests with its screw head against the stop 120. The screw 130 has an external thread which engages with an internal thread of the inner body 112. By rotating the screw 130, the inner body can thus be moved in the outer body 111.Finally, the stop 120 has a radially larger cross section than the expander element 110, so that the stop 120 cannot be guided through an opening or receptacle which the expander element 110 could just still receive.FIG. 2 shows, by way of example and schematically, a further possible embodiment of a device 100 according to the invention for securing a shank 200 (not shown in FIG. 2 ) against being pushed out of a shank receptacle 310 radially enclosing the shank (likewise not shown in FIG. 2 ).The embodiment of FIG. 2 differs from the embodiment of FIG. 1 above all in that the outer body 111 has a circular cross section. In addition, the outer body 111 of the expander member 110 of FIG. 2 does not have a honeycomb structure. In order nevertheless to ensure a high expansion capacity, the outer body 111 instead has a total of eight slots 113.FIG. 3 shows, by way of example and schematically, a shank 200 with the device 100 of FIG. 1, which can be arranged in an axial end of the shank 200.The shaft 200 is, for example, the shaft 200 of a mobile traffic sign.As can be seen, the shaft 200 is formed as a hollow shaft 200, so that the device 100 can be inserted with its expander element 110 into the hollow shaft 200. However, the stop 120 of the device 100 has a radially larger cross section than the expander element 110, so that the stop 120 cannot be guided into the hollow shaft 200.When the expander element 110 is completely accommodated in the hollow shaft 200, by actuating the screw 130 in the direction of rotation, the inner body 112 (not shown in FIG. 3 ) can be moved into the outer body 111 of the expander element 110, such that the inner body 112 spreads the outer body 112 and expands it radially.As a result of the radial expansion, the outer body 111 comes with its outer walls into contact with the inner sides of the hollow shaft 200, so that a clamping effect is produced by frictional force. According to the example, the clamping effect is strong enough to reliably prevent removal of the device 100 from the hollow shaft 200 without any aids.FIG. 4 shows, by way of example and schematically, the shaft 200 of FIG. 3 together with the device 100 of FIG. 1 after arrangement in a base plate 300 of a mobile traffic sign.The base plate 300 has a shaft receptacle 310, in which the shaft 200 is received completely in a radially encircling manner.Since the device 100 is arranged in a clamping manner in the shaft 200, it cannot be removed from the shaft 200 without any aids.Likewise, the shaft 200 cannot be removed from the shaft receptacle 310, since the stop 120 of the device 100 has a radially larger cross section than the shaft receptacle 310. It is thus impossible for the shank 200 to be pushed through or pushed out of the shank receptacle 310 in a direction pointing into the plane of FIG. 4. Likewise, it is impossible to push the shaft 200 through or out of the shaft receptacle 310 in a direction pointing out of the plane of FIG. 4, since a panel is arranged at the other end (not shown in FIG. 4 ) of the shaft 200 or of the mobile traffic sign, which panel likewise cannot be pushed through the shaft receptacle 310.List of reference characters100 Shaft securing device 110 Expander member 111 Outer body 112 Inner body 113 Slit 120 Stopper 130 Expansion pin, screw 200 Shaft, hollow shaft 300 Base plate 310 Shaft receiverReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedU.S. Pat. No. 5,326,352 A

[0006] U.S. Pat. No. 6,282,861 B1

[0007] US 2001 0 027 626 A1

[0007] U.S. Pat. No. 4,798,273 A

[0008] U.S. Pat. No. 4,986,406 A

[0008] ES 1 072 676 U

[0009] KR 102 282 598 B1

[0010]

Claims

Device (100) for securing a shank (200) against being pushed out of a shank receptacle (310) radially comprising the shank (200), wherein the device (100) comprises an expander element (110) and a stop (120), and wherein the device (100) is configured to be fastened to an inner side of the shank (200) by means of the expander element (110), characterized in that the stop (120) has a radially larger cross section than the expander element (110).Device (100) according to claim 1, characterized in that the expander element (110) is configured to be fixed to the inside of the shaft (200) by causing a clamping action on the inside of the shaft (200) in an expanded state.Device (100) according to claim 1, characterised in that the expander element (110) is configured to be fastened to the inner side of the shaft (200) by engaging in an expanded state a form-fit element on the inner side of the shaft (200).Device (100) according to claim 3, characterised in that the expander element (110) has a groove which, in the expanded state of the expander element (110), engages around a tongue on the inner side of the shank (200).Device (100) according to claim 3, characterised in that the expander element (110) has a tongue which, in the expanded state of the expander element (110), engages in a groove on the inner side of the shank (200).Device (100) according to at least one of Claims 1 to 5, characterized in that the expander element (110) comprises an expandable outer body (111) and an inner body (112) which is movable in the outer body (111).Device (100) according to claim 6, characterised in that the expander element (110) is configured such that the outer body (111) expands radially when the inner body (112) is moved into the outer body (111).Device (100) according to at least one of claims 6 and 7, characterised in that the inner body (112) is at least partially made of metal.Device (100) according to at least one of claims 6 to 8, characterised in that the outer body (111) has a cylindrical opening for receiving the inner body (112).Device (100) according to at least one of Claims 6 to 9, characterized in that the inner body (112) is at least partially conical.Device (100) according to at least one of Claims 6 to 10, characterized in that the outer body (111) has a cuboidal opening for receiving the inner body (112).Device (100) according to at least one of Claims 6 to 11, characterized in that the inner body (112) is at least partially pyramidal in shape.Device (100) according to at least one of Claims 6 to 12, characterized in that a maximum radial circumference of the inner body (112) is greater than a maximum inner circumference of the opening for receiving the inner body (112) in the relaxed state of the expander element (110).Device (100) according to at least one of Claims 6 to 13, characterized in that the outer body (111) is radially at least partially slotted in order to promote a radial expansion movement of its walls surrounding the opening.Device (100) according to at least one of Claims 6 to 14, characterized in that the outer body (111) is of elastic design.Device (100) according to at least one of Claims 6 to 15, characterized in that the outer body (111) has a honeycomb structure.Device (100) according to at least one of Claims 6 to 15, characterized in that the outer body (111) consists of a plastic.Device (100) according to at least one of Claims 1 to 17, characterized in that the stop (120) is held on the expander element (110) at an axial end of the expander element (110) by an expansion pin (130).Device (100) according to claim 18, characterised in that the expansion pin (130) is configured to move the inner body into the outer body (111).Device (100) according to at least one of claims 18 and 19, characterised in that the expansion pin (130) is guided through an opening of the stop (120).Device (100) according to at least one of claims 18 to 20, characterised in that the expansion pin (130) rests with a pin head against the stop (120).Device (100) according to at least one of Claims 18 to 21, characterized in that the expansion pin (130) is designed as a screw (130).Device (100) according to Claim22, characterized in that the screw (130) engages into an internal thread of the inner body (112).Device (100) according to at least one of Claims 1 to 23, characterized in that the stop (120) is of disc-shaped design.Device (100) according to at least one of Claims 1 to 24, characterized in that the stop (120) consists of steel or a steel alloy.Device (100) according to at least one of Claims 1 to 24, characterized in that the stop (120) consists of brass or a brass alloy.A shaft (200) comprising a device (100) according to at least one of claims 1 to 26.Shaft (200) according to claim 27, characterised in that the shaft (200) is formed as a hollow shaft (200) at least in the region of the device (100).Shaft (200) according to at least one of claims 27 and 28, characterised in that the shaft (200) is formed completely as a hollow shaft (200).Shaft (200) according to at least one of claims 27 to 29, characterised in that the shaft (200) is formed as a round shaft.The shaft (200) according to at least one of claims 27 to 29, characterized in that the shaft (200) has a square cross section.A mobile traffic sign comprising a shaft (200) according to at least one of claims 27 to 31.Traffic sign according to claim 32, characterised in that the traffic sign has a base plate (300) with a shaft receptacle (310) radially surrounding the shaft (200).Traffic sign according to at least one of Claims 32 and 33, characterized in that the traffic sign has two base plates (300) stacked one above the other, each having a shaft receptacle (310) radially enclosing the shaft (200).

Images