EP2267225A1 - Impact-resistant and energy-absorbing item of street furniture - Google Patents
Impact-resistant and energy-absorbing item of street furniture Download PDFInfo
- Publication number
- EP2267225A1 EP2267225A1 EP10167080A EP10167080A EP2267225A1 EP 2267225 A1 EP2267225 A1 EP 2267225A1 EP 10167080 A EP10167080 A EP 10167080A EP 10167080 A EP10167080 A EP 10167080A EP 2267225 A1 EP2267225 A1 EP 2267225A1
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- EP
- European Patent Office
- Prior art keywords
- item
- base plate
- post
- street furniture
- energy absorbing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
- E01F9/627—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection self-righting after deflection or displacement
- E01F9/629—Traffic guidance, warning or control posts, bollards, pillars or like upstanding bodies or structures
Definitions
- This invention relates to the field of item of street furnitures and obstacles, particularly those items of street furniture and obstacles which are energy-absorbing and/or impact-resistant.
- the term "item of street furniture” covers, among other things, the following objects (the list is not exhaustive), all of which are either mounted on the ground or secured to a wall, namely:
- the invention relates to an item of street furniture which on the one hand will limit this damage and/or injury in a collision/contact with both the item of street furniture and the colliding object or person in the case of minor collisions/contacts (this is the energy-absorbing part), whereupon the item of street furniture springs back into its normal position, whilst on the other hand the item of street furniture still performs a protective function from a defined degree of collision/contact, namely bringing the object or person which/who caused the collision/contact to a standstill (this is the impact-resistant part), without losing its resilient capacity.
- the object of the invention is now just to produce item of street furniture so simply that it can be manufactured from only a few parts and, in addition, is very easy to assemble and position, with the result that a repair - if necessary- can be carried out very easily and cheaply.
- the absence of parts of the item of street furniture below ground level prevents submersion or the seeping in of water and the associated corrosion.
- the item of street furniture can be dismantled in situ with simple tools and parts can be replaced if necessary.
- the energy-absorbing element is also located above ground in the item of street furniture in an easily accessible position. Therefore the manufacture and use of the item of street furniture are simple, whilst it can be manufactured and repaired at low cost. It is also important for the post (3) to be the impact-absorbing element, i.e. practically every point on the post (3), throughout its length, can be an active point of application for the external forces which act on the item of street furniture with full retention of the impact and absorbing properties.
- the post may be the only impact-absorbing element, which means that part of the item of street furniture which can be moved by an object, a person or the wind, because the base plate is kept as low as possible, thus enabling a vehicle or a person to collide under normal circumstances only against the post and not against the base plate.
- the range of the energy absorption of the individual item of street furniture can easily be adapted to changing circumstances by adjusting the energy absorbing element in situ.
- the action may take place in two steps, namely a spring action followed, if necessary, by a rigid action, as is also the case in the aforementioned state of the art, namely BE-A-1 013 952 .
- the "normal position of the item of street furniture” is the position which the item of street furniture assumes when it is free and unloaded, i.e. without the influence of external forces, and a "rigid whole” is a unit of components or parts which can no longer move relative to one another, i.e. the post (3) and the base plate (2) may both be regarded as a rigid whole.
- Claims 2 to 15 inclusive describe further embodiments of the item of street furniture.
- Figures 1 to 13 describe different embodiments of the invention.
- Figures 1 to 4 inclusive describe a first embodiment of an item of street furniture (1) according to the invention, consisting exclusively of a post (3) which is movably connected to a base plate (2), a further energy absorbing element (4) being fitted in the item of street furniture. These three components are not fastened to one another but simply slide into one another so that they only lie in contact with one another, as is clearly seen in Figures 2 and 3 .
- the base plate (2) is intended to be fastened to a base or the ground (existing flat ground surface 5 or a flat foundation adapted for this purpose), wall (18) or a supporting structure (23).
- the base plate (2) therefore consists of a wall or tube (6) which encloses a hollow space (17) and which is provided at its one end (7) with an inwardly directed flange or collar (8) which partially seals the hollow space (17) in the direction of the post, thereby creating an opening (16) which provides access to this hollow space (17) and which, at its other end (9), is provided with an outwardly directed fastening flange or collar (10), which is provided with bores (11) for fastening the base plate (2) to the ground or wall surface (5, 18) by means of screws or bolts.
- the wall or tube (6) is cylindrical in shape and the hollow space (17) is arranged centrally. It is clear that other shapes for the wall or tube (6) and other positions of the hollow space (17) in the wall or tube (6) are also suitable in the context of the invention. Although the cross-section of a tube is in most cases circular in shape, this cross-section may also be polygonal or have any other shape in the context of the invention. The choice of the shape of the wall which encloses the hollow shape (17) is also completely free.
- This shape may, for example, be conical (see Figure 13 ), bent, spherical, hemi-spherical etc., in which case such shapes, in the direction of the post (3), may terminate in the opening (16) of the hollow space (17), that is without a separate flange or collar (8).
- the flanges and collars are directed radially.
- the flanges or collars (15 and 8) interacting with one another may extend radially and outwardly or inwardly respectively.
- the length of the wall or tube (6) of the base plate (2) must be so small that practically all points of the post (3) may be an active point of application for the external forces which act on the item of street furniture, and not the base plate (2).
- the opening (16) may have such a shape that the post (3), on impact, is guided in a direction other than the direction of impact (see Figure 12 ). This may be advantageous if the space which is available for the item of street furniture to avoid the impact is small. Because of the shape of the opening (16) a well-defined displacement of the post can be achieved, e.g. as a function of the distance to an object or area to be protected.
- the base plate (2) may be both an assembly of different elements, such as, for example, tube sections, flanges etc. which together do form a rigid whole, and may be cast in one piece.
- the post (3) in the embodiment shown, is cylindrical. All other shapes for the post are of course possible, and no limits are set with regard to the cross-section either, and the post may also be solid or hollow. This shape-independence provides the possibility of adapting the strength of the post to the conditions.
- the post (3) has, on its side facing the base plate (2), an outwardly directed flange or collar (15) which may also be arranged radially.
- this flange or collar (15) When assembled, this flange or collar (15) is located in the hollow space (17) so that the post (3) projects through the opening (16), and this flange or collar (15) hooks on behind the inwardly directed flange or collar (8) of the base plate (2) because the outside diameter D of the flange or collar (15) is greater than the inside dimension D' of the flange or collar (8), which is in turn greater than the diameter of the opening (16).
- first direct contact between the post (3) and the base plate (2) The dimensions of these interacting flanges and collars (8 and 15) hooking into one another (first direct contact between the post (3) and the base plate (2)) are such that there is not only sufficient clearance between the two parts, namely the flanges or collars of post (3) and base plate (2) to make possible a hinging movement between the post (3) and the base plate (2) inside the hollow space (17), but it is also such that after a defined limit value for the position of the post (3) relative to the foot (2) is reached, and after a relative movement of the post (3) and base plate (2) relative to one another, the post (3) comes into contact with the inner edge of the flange or collar (8) of the base plate (2), thereby creating a second direct contact between the post (3) and the base plate (2), and so that, as a result of the first and second direct contact, a rigid whole is formed by the post (3) and the base plate (2) and this whole can only be moved further as a unit under the influence of a collision/impact.
- An energy absorbing element (4) is provided in the hollow space (17) and is arranged in this hollow space (17) so that, when assembled, the post (3) and the base plate (2) always press against one another in order to bring and maintain the item of street furniture in the normal position, i.e. the energy absorbing element has a resilience, the absorbed energy being re-released when the external forces disappear. Because of this pressing against one another a first direct contact is established between the post (3) and the base plate (2).
- the energy absorbing element (4) is in this embodiment positioned between the post (3) on the one hand and the ground or floor surface (5) to which the base plate (2) is secured on the other.
- the base plate (2) can be provided with a bottom plate (19) which seals the hollow space (17) in the base plate (2) at the bottom (see Figure 9 ).
- This bottom plate (19) must be releasably connected to the rest of the base plate (2) to enable the post (3) to be inserted through the opening (16) when the item of street furniture is assembled.
- the post (3) may lie with its underside directly against the energy absorbing element (4).
- the energy absorbing element (4) can be assembled in different ways and can have all kinds of shapes. For example, it may be a homogeneous block manufactured from one rubber or another, elastomer or any other material with resilient and/or damping properties, or it may be constructed in different layers of elastic material with varying elasticity and/or damping properties.
- an elastic material (4) which is elastically deformable, but incompressible or hardly compressible, so that during the deformation under an impact only the shape of the elastic material is changed, whilst its volume remains unchanged or almost unchanged because the volume cannot be compressed or can hardly be compressed due to its incompressible nature.
- an elastic material it is simple to estimate in advance the relative movement between the post (3) and the base plate (2). The energy which is absorbed during this relative movement is re-released when the load (impact or wind load) disappears in order to return the post and hence the item of street furniture to its normal position.
- the energy absorbing element (4) may or may not be secured to either the post (3) or the base plate (2).
- the energy absorbing element (4) may be composed of different deformable and elastic materials.
- the energy absorbing element (4) it is possible to make part of the energy absorbing element (4) so that this part (centring elements or a centring ring 20 in Figures 3 and 11 ) centres the energy absorbing element (4) in the hollow space (17). It is also possible for the energy absorbing element to be provided with a part (element 21 in Figure 11 ) which, at the beginning of a loading (impact or wind load) of the item of street furniture, causes an additional resistance, as a result of which the beginning of the movement of the post (3) relative to the base plate (2) is delayed.
- part of the energy absorbing element (4) against the inside of the wall or tube (6) in such a manner that high friction is produced during a movement of the energy absorbing element (4) relative to this inner surface, or, for example, so that a projecting part of the energy absorbing element (4) interacts with a corresponding hollow on the inner surface of the wall or tube (6) of the base plate (2).
- this projecting part is provided in the shape of a disc-shaped part (21) which interacts with a groove (22) on the inner surface of the wall or tube (6) of the base plate (2).
- the energy absorbing element (4) will in the first instance be compressed, impact energy being absorbed during the collision because of the damping properties of the energy absorbing element (4). Consequently the collision will be much less violent for a driver sitting in the vehicle, the greatest shock during the impact of the vehicle with the item of street furniture being broken.
- the post (3) and the base plate (2) will move relative to one another as a result of the compression and deformation of the energy absorbing element (4). This relative movement between the post (3) and the base plate (2) is made impossible once a defined limit value for the position of the post (3) relative to the base plate (2) is reached.
- the post (3) lies with its outside against the inner edge of the flange or collar (8) of the base plate (2), thereby creating a second direct contact between the post (3) and the base plate (2).
- the energy absorbing element (4) always attempts to press the flange or collar (15) of the post (3) against the flange or collar (8) of the base plate (first direct contact), and because, as a result of the impact, the post (3) tilts so that at a certain time it comes into contact, on its outside, with the flange or collar (8) of the base plate (2) (second direct contact), we have a rigid whole because firstly the flanges (8 and 15) have a contact pivot with one another (first direct contact), and because secondly a contact (second direct contact) is established between the outside of the post (3)and the outer edge of the flange or collar (8) of the base plate (2).
- Such a condition is represented in Figure 4 .
- One advantage of this rigid whole is that the energy absorbing element (4) cannot be deformed further and no plastic destruction takes place, as otherwise the resilience of the energy absorbing element (4) would be lost.
- the energy absorbing element (4) in the hollow space in the base plate (2) therefore forms, in fact, a type of hinge with a damping action, wherein, when a force is exerted transversely to the item of street furniture, the energy absorbing element (4) is deformed in such a manner that the post (3) undergoes from this hinge an angular distortion relative to the unloaded condition until a defined limit value is reached.
- the energy absorbing element (4) consists of less compressible materials, more force will be required to obtain deformation, so that such materials should preferably be used in applications where the impact may be great or the movement between the post (3) and the base plate (2) is to be considerably limited. Conversely in the case of easily compressible materials (4) it will require relatively little force to obtain deformation of the energy absorbing element (4), so that the so-called defined limit value for the position of the post (3) relative to the base plate (2) is reached very quickly.
- a further advantage of the item of street furniture according to the invention is that the energy absorbing element (4) is enclosed in the hollow space (17), thereby protecting it from weather conditions so that it is not greatly subject to weathering and/or degeneration, which means that its energy absorbing capacity, as well as its resilience, are not lost.
- the item of street furniture is constructed symmetrically so that the behaviour of the item of street furniture is always the same in the event of a collision from any direction. According to the invention, of course, this need not always be the case, and the material of the energy absorbing element (4) could be different in a certain direction from the material used in another direction in order to ensure that the item of street furniture behaves differently in different directions.
- the item of street furniture according to the invention has a very simple structure since it consists only of a post (3), a base plate (2) and an energy absorbing element (4). It can therefore be manufactured and repaired very inexpensively and is therefore suitable for all kinds of applications.
- the assembly of the item of street furniture is also extremely simple since the three parts are not fastened to one another but simply lie against one another. In fact, the three parts are simply slid into one another. Because there is a mechanical limitation, because of the first and second direct contact, which emerges into a rigid whole of the post (3) and base plate (2), the degree of deformation of the energy absorbing element is limited, of course, below the maximum permissible degree of deformation of the energy absorbing element (4). As a result of this the energy absorbing element (4) always has the same action and does not lose its resilience.
- Figures 5 and 6 show a further embodiment of an item of street furniture according to the invention, wherein the item of street furniture is fastened by means of its base plate (2) to a wall (18).
- This embodiment is very suitable, for example, for use as a support beam of a porch, e.g. by ensuring that the item of street furniture begins to move before the bending load of the supporting beam of the porch is reached. This may prevent, for example, the supporting beam from suddenly buckling under a heavy load, e.g. a snow load.
- Figures 7 and 8 show that the post (3) may assume all kinds of shapes. Other shapes are not excluded, of course, and other cross-sections are possible.
- Figure 9 shows that the base plate (2) is provided with a bottom plate (19) which is secured to the fastening flange or collar (10).
- a foundation or supporting structure (23) must be provided to which the item of street furniture can be secured above ground.
- the foundation or supporting structure must be anchored in the ground (see Figure 10 ).
- FIG 11 shows an energy absorbing element (4) with a centring ring (20) and with a disc-shaped part (21) which interacts with a groove (22) on the inner surface of the wall or tube (6) of the base plate (2).
- the position of the centring ring (20) and the disc-shaped section (21) on the energy absorbing element (4) may be freely selected. It will be clear that it is even sufficient to have, instead of a centring ring (20), a plurality of centring elements which are arranged on the energy absorbing element (4) in order to centre the energy absorbing element (4) in the hollow space (17).
- centring elements or one or more centring rings (20) may of course also be fitted.
- the item of street furniture may be used not only in the technical fields indicated in the preamble of the description but may also be used, for example, in locations with slow traffic, such as in car parks and in shopping centres, to protect machines and installations, for all kinds of internal and external transport equipment, and even for protecting against vandalism, due to its blocking function.
Abstract
Description
- We are surrounded by many rigid items of street furniture which can be unintentionally collided with, resulting in damage not only to the rigid items of street furniture but also to the object (e.g. a vehicle) or in injury to the person who collides with the item of street furniture. This invention relates to the field of item of street furnitures and obstacles, particularly those items of street furniture and obstacles which are energy-absorbing and/or impact-resistant.
- In the context of the invention the term "item of street furniture" covers, among other things, the following objects (the list is not exhaustive), all of which are either mounted on the ground or secured to a wall, namely:
- Poles or supports of traffic signs;
- Poles or supports of advertising boardings;
- Poles or supports of parking meters;
- Supports of sign boards or canopies;
- Protective posts which stand or are suspended in front of an object to be protected;
- Supports for conveyor belts;
- Supporting posts of guard rail structures or protective brackets;
- Posts for braking falling and/or rolling loads;
- Lamp posts;
- Poles or supports of traffic lights;
- and similar objects.
- It is now known from a number of documents that such items of street furniture can be designed so that the consequences of minor collisions, contacts or gusts of wind can be limited. Indeed some items of street furniture bend completely so that the object or person which/who caused the collision is/are able to move over the item of street furniture. It is possible that such items of street furniture are energy-absorbing, but they are not impact-resistant in all cases.
- However, the invention relates to an item of street furniture which on the one hand will limit this damage and/or injury in a collision/contact with both the item of street furniture and the colliding object or person in the case of minor collisions/contacts (this is the energy-absorbing part), whereupon the item of street furniture springs back into its normal position, whilst on the other hand the item of street furniture still performs a protective function from a defined degree of collision/contact, namely bringing the object or person which/who caused the collision/contact to a standstill (this is the impact-resistant part), without losing its resilient capacity.
- The Belgian patent
BE-A-1 013 952 (Wolters - The object of the invention is now just to produce item of street furniture so simply that it can be manufactured from only a few parts and, in addition, is very easy to assemble and position, with the result that a repair - if necessary- can be carried out very easily and cheaply.
- This object is achieved by an item of street furniture such as that defined in Claim 1. In such an item of street furniture the number of parts is limited to the absolute minimum and, in addition, it is assembled by simply sliding the post (3), the base plate (2) and the energy-absorbing element (4) into one another and by simply anchoring the base plate to an existing floor or to a wall. The simple sliding of these parts into one another is extremely simple because they are not fastened to one another, but only lie in contact with one another. In this connection it is pointed out that the terms "post" and "base plate", in the context of the invention, must be understood that they can be composed of different parts, parts which when in use form one unit, i.e. they are firmly connected to each other so that when in use no relative movement between these parts is possible.
The absence of parts of the item of street furniture below ground level prevents submersion or the seeping in of water and the associated corrosion. When maintaining or replacing the few parts the item of street furniture can be dismantled in situ with simple tools and parts can be replaced if necessary. The energy-absorbing element is also located above ground in the item of street furniture in an easily accessible position.
Therefore the manufacture and use of the item of street furniture are simple, whilst it can be manufactured and repaired at low cost. It is also important for the post (3) to be the impact-absorbing element, i.e. practically every point on the post (3), throughout its length, can be an active point of application for the external forces which act on the item of street furniture with full retention of the impact and absorbing properties. These external forces may be either a vehicle, a person, the wind or the like. The post may be the only impact-absorbing element, which means that part of the item of street furniture which can be moved by an object, a person or the wind, because the base plate is kept as low as possible, thus enabling a vehicle or a person to collide under normal circumstances only against the post and not against the base plate.
The range of the energy absorption of the individual item of street furniture can easily be adapted to changing circumstances by adjusting the energy absorbing element in situ.
The action may take place in two steps, namely a spring action followed, if necessary, by a rigid action, as is also the case in the aforementioned state of the art, namelyBE-A-1 013 952 -
Claims 2 to 15 inclusive describe further embodiments of the item of street furniture. - In the context of the invention the terms "directed outwards" and "directed inwards" must be viewed from the centre of the item of street furniture, thus on the one hand from the centre viewed towards the outside, and on the other from outside to the centre.
-
Figures 1 to 13 describe different embodiments of the invention.Figures 1 to 4 inclusive describe a first embodiment of an item of street furniture (1) according to the invention, consisting exclusively of a post (3) which is movably connected to a base plate (2), a further energy absorbing element (4) being fitted in the item of street furniture. These three components are not fastened to one another but simply slide into one another so that they only lie in contact with one another, as is clearly seen inFigures 2 and3 .
The base plate (2) is intended to be fastened to a base or the ground (existing flat ground surface 5 or a flat foundation adapted for this purpose), wall (18) or a supporting structure (23). In each case the item of street furniture is not worked into the ground or in the wall but is placed on top of it and secured to the ground or wall surface. The base plate (2) therefore consists of a wall or tube (6) which encloses a hollow space (17) and which is provided at its one end (7) with an inwardly directed flange or collar (8) which partially seals the hollow space (17) in the direction of the post, thereby creating an opening (16) which provides access to this hollow space (17) and which, at its other end (9), is provided with an outwardly directed fastening flange or collar (10), which is provided with bores (11) for fastening the base plate (2) to the ground or wall surface (5, 18) by means of screws or bolts. In this embodiment the wall or tube (6) is cylindrical in shape and the hollow space (17) is arranged centrally. It is clear that other shapes for the wall or tube (6) and other positions of the hollow space (17) in the wall or tube (6) are also suitable in the context of the invention. Although the cross-section of a tube is in most cases circular in shape, this cross-section may also be polygonal or have any other shape in the context of the invention. The choice of the shape of the wall which encloses the hollow shape (17) is also completely free. This shape may, for example, be conical (seeFigure 13 ), bent, spherical, hemi-spherical etc., in which case such shapes, in the direction of the post (3), may terminate in the opening (16) of the hollow space (17), that is without a separate flange or collar (8). In a preferred design, the flanges and collars are directed radially. The flanges or collars (15 and 8) interacting with one another may extend radially and outwardly or inwardly respectively. The length of the wall or tube (6) of the base plate (2) must be so small that practically all points of the post (3) may be an active point of application for the external forces which act on the item of street furniture, and not the base plate (2). It is also possible to arrange the opening (16) non-centrally, or to make it non-circular. For example, the opening (16) may have such a shape that the post (3), on impact, is guided in a direction other than the direction of impact (seeFigure 12 ). This may be advantageous if the space which is available for the item of street furniture to avoid the impact is small. Because of the shape of the opening (16) a well-defined displacement of the post can be achieved, e.g. as a function of the distance to an object or area to be protected.
The base plate (2) may be both an assembly of different elements, such as, for example, tube sections, flanges etc. which together do form a rigid whole, and may be cast in one piece. - The post (3), in the embodiment shown, is cylindrical. All other shapes for the post are of course possible, and no limits are set with regard to the cross-section either, and the post may also be solid or hollow. This shape-independence provides the possibility of adapting the strength of the post to the conditions. The post (3) has, on its side facing the base plate (2), an outwardly directed flange or collar (15) which may also be arranged radially.
When assembled, this flange or collar (15) is located in the hollow space (17) so that the post (3) projects through the opening (16), and this flange or collar (15) hooks on behind the inwardly directed flange or collar (8) of the base plate (2) because the outside diameter D of the flange or collar (15) is greater than the inside dimension D' of the flange or collar (8), which is in turn greater than the diameter of the opening (16).
The dimensions of these interacting flanges and collars (8 and 15) hooking into one another (first direct contact between the post (3) and the base plate (2)) are such that there is not only sufficient clearance between the two parts, namely the flanges or collars of post (3) and base plate (2) to make possible a hinging movement between the post (3) and the base plate (2) inside the hollow space (17), but it is also such that after a defined limit value for the position of the post (3) relative to the foot (2) is reached, and after a relative movement of the post (3) and base plate (2) relative to one another, the post (3) comes into contact with the inner edge of the flange or collar (8) of the base plate (2), thereby creating a second direct contact between the post (3) and the base plate (2), and so that, as a result of the first and second direct contact, a rigid whole is formed by the post (3) and the base plate (2) and this whole can only be moved further as a unit under the influence of a collision/impact. For this purpose the shape of the inner edge of the flange or collar (8) can be adapted to the shape of the post (3) to obtain a better contact (second direct contact). The adaptation may be a achieved by bevelling the flange or collar (8). - An energy absorbing element (4) is provided in the hollow space (17) and is arranged in this hollow space (17) so that, when assembled, the post (3) and the base plate (2) always press against one another in order to bring and maintain the item of street furniture in the normal position, i.e. the energy absorbing element has a resilience, the absorbed energy being re-released when the external forces disappear. Because of this pressing against one another a first direct contact is established between the post (3) and the base plate (2). The energy absorbing element (4) is in this embodiment positioned between the post (3) on the one hand and the ground or floor surface (5) to which the base plate (2) is secured on the other. Alternatively, the base plate (2) can be provided with a bottom plate (19) which seals the hollow space (17) in the base plate (2) at the bottom (see
Figure 9 ). This bottom plate (19) must be releasably connected to the rest of the base plate (2) to enable the post (3) to be inserted through the opening (16) when the item of street furniture is assembled. The post (3) may lie with its underside directly against the energy absorbing element (4).
The energy absorbing element (4) can be assembled in different ways and can have all kinds of shapes. For example, it may be a homogeneous block manufactured from one rubber or another, elastomer or any other material with resilient and/or damping properties, or it may be constructed in different layers of elastic material with varying elasticity and/or damping properties. In certain cases it may be interesting to use an elastic material (4) which is elastically deformable, but incompressible or hardly compressible, so that during the deformation under an impact only the shape of the elastic material is changed, whilst its volume remains unchanged or almost unchanged because the volume cannot be compressed or can hardly be compressed due to its incompressible nature. With such an elastic material it is simple to estimate in advance the relative movement between the post (3) and the base plate (2). The energy which is absorbed during this relative movement is re-released when the load (impact or wind load) disappears in order to return the post and hence the item of street furniture to its normal position. It is clear that many designs are possible where the damping and resilient properties of the energy absorbing element (4) can be adapted as a function of the behaviour of the item of street furniture to be achieved upon impact. The energy absorbing element (4) may or may not be secured to either the post (3) or the base plate (2). The energy absorbing element (4) may be composed of different deformable and elastic materials. - It is possible to make part of the energy absorbing element (4) so that this part (centring elements or a
centring ring 20 inFigures 3 and11 ) centres the energy absorbing element (4) in the hollow space (17). It is also possible for the energy absorbing element to be provided with a part (element 21 inFigure 11 ) which, at the beginning of a loading (impact or wind load) of the item of street furniture, causes an additional resistance, as a result of which the beginning of the movement of the post (3) relative to the base plate (2) is delayed. One possibility of achieving this is to arrange part of the energy absorbing element (4) against the inside of the wall or tube (6) in such a manner that high friction is produced during a movement of the energy absorbing element (4) relative to this inner surface, or, for example, so that a projecting part of the energy absorbing element (4) interacts with a corresponding hollow on the inner surface of the wall or tube (6) of the base plate (2). InFigure 11 this projecting part is provided in the shape of a disc-shaped part (21) which interacts with a groove (22) on the inner surface of the wall or tube (6) of the base plate (2). - The action of the item of street furniture according to the invention is simple and is explained below with reference to
Figures 3 and 4 .
InFigure 3 the item of street furniture is in a condition where it is left undisturbed. In this case the item of street furniture stands vertically upright, wherein the resilience in the energy absorbing element (4) on which the post (3) is supported ensures not only that this vertical position is maintained as long as no forces F (e.g. impact or wind load) are exerted on the item of street furniture, but also that a first direct contact is established between the post (3) and the base plate (2). If a force F is now exerted, e.g. in a direction transverse to the item of street furniture, e.g. as a result of a collision by a vehicle or the like, the energy absorbing element (4) will in the first instance be compressed, impact energy being absorbed during the collision because of the damping properties of the energy absorbing element (4). Consequently the collision will be much less violent for a driver sitting in the vehicle, the greatest shock during the impact of the vehicle with the item of street furniture being broken. Of course the post (3) and the base plate (2) will move relative to one another as a result of the compression and deformation of the energy absorbing element (4). This relative movement between the post (3) and the base plate (2) is made impossible once a defined limit value for the position of the post (3) relative to the base plate (2) is reached. At that moment the post (3) lies with its outside against the inner edge of the flange or collar (8) of the base plate (2), thereby creating a second direct contact between the post (3) and the base plate (2). Because the energy absorbing element (4) always attempts to press the flange or collar (15) of the post (3) against the flange or collar (8) of the base plate (first direct contact), and because, as a result of the impact, the post (3) tilts so that at a certain time it comes into contact, on its outside, with the flange or collar (8) of the base plate (2) (second direct contact), we have a rigid whole because firstly the flanges (8 and 15) have a contact pivot with one another (first direct contact), and because secondly a contact (second direct contact) is established between the outside of the post (3)and the outer edge of the flange or collar (8) of the base plate (2). This contact pivot (first direct contact) and that contact (second direct contact) together prevent further movement of the post (3) relative to the base plate (2). Such a condition is represented inFigure 4 . One advantage of this rigid whole is that the energy absorbing element (4) cannot be deformed further and no plastic destruction takes place, as otherwise the resilience of the energy absorbing element (4) would be lost. The energy absorbing element (4) in the hollow space in the base plate (2) therefore forms, in fact, a type of hinge with a damping action, wherein, when a force is exerted transversely to the item of street furniture, the energy absorbing element (4) is deformed in such a manner that the post (3) undergoes from this hinge an angular distortion relative to the unloaded condition until a defined limit value is reached.
It is clear that when the energy absorbing element (4) consists of less compressible materials, more force will be required to obtain deformation, so that such materials should preferably be used in applications where the impact may be great or the movement between the post (3) and the base plate (2) is to be considerably limited. Conversely in the case of easily compressible materials (4) it will require relatively little force to obtain deformation of the energy absorbing element (4), so that the so-called defined limit value for the position of the post (3) relative to the base plate (2) is reached very quickly.
A further advantage of the item of street furniture according to the invention is that the energy absorbing element (4) is enclosed in the hollow space (17), thereby protecting it from weather conditions so that it is not greatly subject to weathering and/or degeneration, which means that its energy absorbing capacity, as well as its resilience, are not lost.
In the example shown, the item of street furniture is constructed symmetrically so that the behaviour of the item of street furniture is always the same in the event of a collision from any direction. According to the invention, of course, this need not always be the case, and the material of the energy absorbing element (4) could be different in a certain direction from the material used in another direction in order to ensure that the item of street furniture behaves differently in different directions. - The item of street furniture according to the invention has a very simple structure since it consists only of a post (3), a base plate (2) and an energy absorbing element (4). It can therefore be manufactured and repaired very inexpensively and is therefore suitable for all kinds of applications. The assembly of the item of street furniture is also extremely simple since the three parts are not fastened to one another but simply lie against one another. In fact, the three parts are simply slid into one another. Because there is a mechanical limitation, because of the first and second direct contact, which emerges into a rigid whole of the post (3) and base plate (2), the degree of deformation of the energy absorbing element is limited, of course, below the maximum permissible degree of deformation of the energy absorbing element (4). As a result of this the energy absorbing element (4) always has the same action and does not lose its resilience.
-
Figures 5 and 6 show a further embodiment of an item of street furniture according to the invention, wherein the item of street furniture is fastened by means of its base plate (2) to a wall (18). This embodiment is very suitable, for example, for use as a support beam of a porch, e.g. by ensuring that the item of street furniture begins to move before the bending load of the supporting beam of the porch is reached. This may prevent, for example, the supporting beam from suddenly buckling under a heavy load, e.g. a snow load. -
Figures 7 and 8 show that the post (3) may assume all kinds of shapes. Other shapes are not excluded, of course, and other cross-sections are possible. -
Figure 9 shows that the base plate (2) is provided with a bottom plate (19) which is secured to the fastening flange or collar (10). - If the item of street furniture has to be mounted in solid ground a foundation or supporting structure (23) must be provided to which the item of street furniture can be secured above ground. The foundation or supporting structure must be anchored in the ground (see
Figure 10 ). -
Figure 11 shows an energy absorbing element (4) with a centring ring (20) and with a disc-shaped part (21) which interacts with a groove (22) on the inner surface of the wall or tube (6) of the base plate (2). The position of the centring ring (20) and the disc-shaped section (21) on the energy absorbing element (4) may be freely selected.
It will be clear that it is even sufficient to have, instead of a centring ring (20), a plurality of centring elements which are arranged on the energy absorbing element (4) in order to centre the energy absorbing element (4) in the hollow space (17). In the embodiments shown inFigures 5 to 10 , centring elements or one or more centring rings (20) may of course also be fitted. - The item of street furniture may be used not only in the technical fields indicated in the preamble of the description but may also be used, for example, in locations with slow traffic, such as in car parks and in shopping centres, to protect machines and installations, for all kinds of internal and external transport equipment, and even for protecting against vandalism, due to its blocking function.
- The invention is by no means limited to the items of street furniture described as examples and shown in the figures, but items of street furniture according to the invention may also be realised in many different ways.
Claims (15)
- An item of street furniture which is located exclusively above ground level characterised in that
the item of street furniture consists exclusively of a post (3), a base plate (2) and an energy absorbing element (4);
wherein only the base plate (2) is fastened directly to an existing ground surface (5), to a foundation adapted for this purpose, to a wall (18) or to a supporting structure (23);
wherein the energy absorbing element (4) is arranged in such a manner relative to the post (3) and base plate (2) that they are both pressed together at all times, thereby creating a first direct contact between the post (3) and the base plate (2), as a result of which the item of street furniture is brought and maintained in the normal position, i.e. the energy absorbing element (4) releases the absorbed energy when the external forces disappear, and wherein the energy absorbing element (4) also remains in direct contact at all times with the post (3) on the one hand, and with the ground surface (5), the foundation, the wall (18), the supporting structure (23) or the bottom plate (19) of the base plate (2) on the other;
and wherein the post (3), the base plate (2) and the energy absorbing element (4) are arranged relative to one another in such a manner
that at the beginning of a movement of the post (3) relative to the base plate (2), from the normal position of the item of street furniture, the energy absorbing element (4) is able to absorb this first movement without damage to the parts of the item of street furniture, and
that when a defined limit value for the position of the post (3) relative to the base plate (2) is reached, a second direct contact is established between the post (3) and the base plate (2), and a further movement of the post (3) relative to the base plate (2) is no longer possible because, with further movement of the post (3) from this defined position, a rigid whole is formed consisting of the post (3) and the base plate (2) by means of the first and second direct contact between the post (3)and the base plate (2), as a result of which the energy absorbing element (4) is not additionally loaded. - The item of street furniture according to claim 1, characterised in that
the post (3), the base plate (2) and the energy absorbing element (4), when in use, are simply slid into one another so that they only lie against one another without being fastened to one another. - The item of street furniture according to any one of the preceding claims , characterised in that
the base plate (2) is provided with means for securing the item of street furniture to the ground surface (5), the foundation, the wall (18) or the supporting structure (23). - The item of street furniture according to Claim 3, characterised in that
the securing means of the base plate (2) consist of an outwardly directed fastening flange or collar (10) which is provided with borings (11). - The item of street furniture according to any one of Claims 3 and 4, characterised in that
the base plate (2) is also provided with a wall or tube (6) arranged on the securing means or connected to the inner edge of the fastening flange or collar (10), which wall or tube encloses a hollow space (17) in which the energy absorbing element (4) is arranged. - The item of street furniture according to claim 5, characterised in that the hollow space (17) is arranged centrally in the wall or tube (6).
- The item of street furniture according to claim 5, characterised in that the wall or tube (6) is cylindrical.
- The item of street furniture according to claim 5, characterised in that
the base plate (2) is also provided with an inwardly directed flange or collar (8) partially sealing the hollow space (17) in the direction of the post (3), thereby creating an opening (16) through which the underside of the post (3), directed toward the base plate (2), is arranged in the hollow space (17). - The item of street furniture according to claim 8, characterised in that
the opening (16) is shaped so that during the movement of the post (3) relative to the base plate (2) the post (3) is forced in a direction other than in the direction of the exerted force. - The item of street furniture according to claim 5 , characterised in that
a part (centring elements or centring ring 20) of the energy absorbing element (4) is provided for centring the energy absorbing element (4) in the hollow space (17). - The item of street furniture according to any one of the preceding claims, characterised in that
the underside of the post (3) terminates laterally in an outwardly directed flange or collar (15). - The item of street furniture according to claim 11 when dependent on claim 8 , characterised in that
the energy absorbing element (4), in the normal position of the item of street furniture, presses the outwardly directed flange or collar (15) of the post (3) against the inwardly directed flange or collar (8) of the base plate (2) in order to maintain the item of street furniture in its normal position. - The item of street furniture according to claim 5, characterised in that
the energy absorbing element(4) is shaped so that from the beginning of the movement of the post (3) relative to the base plate (2) until the defined limit value for the position of the post (3) relative to the base plate (2) is reached, a deformation of the energy absorbing element (4) is possible in the hollow space (17). - The item of street furniture according to any one of the preceding claims 1, characterised in that
the energy absorbing element (4) is arranged relative to the post (3) and the base plate (2) so that in the normal position of the item of street furniture the energy absorbing element (4), in addition to the function of pressing the post (3) and base plate (2) against one another, causes an additional resistance which can delay the beginning of the movement of the post (3) relative to the base plate (2) when the item of street furniture is loaded. - The item of street furniture according to claim 14 when dependent on claim 5, characterised in that
the energy absorbing element (4) is provided with the additional resistance because a part of the energy absorbing element (4) is received, in the normal position of the item of street furniture, in a groove (22) on the inner surface of the wall or tube (6) of the base plate (2).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2009/0383A BE1018316A3 (en) | 2009-06-23 | 2009-06-23 | IMPACT RESISTENT AND ENERGY ABSORBENT OBSTACLE. |
Publications (2)
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EP2267225A1 true EP2267225A1 (en) | 2010-12-29 |
EP2267225B1 EP2267225B1 (en) | 2012-10-03 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10167080A Active EP2267225B1 (en) | 2009-06-23 | 2010-06-23 | Impact-resistant and energy-absorbing item of street furniture |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2267225B1 (en) |
BE (1) | BE1018316A3 (en) |
ES (1) | ES2396193T3 (en) |
Cited By (9)
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KR200453957Y1 (en) | 2011-03-22 | 2011-06-13 | (주)로드텍 | Fixed pedestal with shock absorber replacement and shock absorbing |
WO2013132299A3 (en) * | 2012-03-06 | 2014-01-23 | Sabic Innovative Plastics Ip B.V. | Energy absorbing system for electric vehicle charging station and methods for making and using the same |
WO2015051984A1 (en) * | 2013-10-07 | 2015-04-16 | Gerard Wolters | Impact-resistant and energy-absorbing item of street furniture |
GB2539763A (en) * | 2015-04-24 | 2016-12-28 | Mccue Corp | Sign post assembly with impact absorbing mechanism |
CN107178052A (en) * | 2017-05-31 | 2017-09-19 | 青岛澳波泰克安全设备有限责任公司 | A kind of self- recoverage type anticollision barrier |
EP3741915A1 (en) * | 2019-05-21 | 2020-11-25 | Wonjin, Aluminium | One-way pivoting bollard |
CN112253399A (en) * | 2020-10-20 | 2021-01-22 | 潘铨 | Anti-impact offshore wind power generation equipment |
FR3100533A1 (en) * | 2019-09-09 | 2021-03-12 | Global Industrial Security Systems | Protective device such as a stud or barrier in particular intended for the protection of shelving. |
KR102595296B1 (en) * | 2023-03-21 | 2023-10-26 | 장정은 | Bollard for floor installation |
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DE1534571A1 (en) * | 1966-09-22 | 1969-08-21 | Schoenenberger Kurt B | Joint for motorway glare shield |
DE9203503U1 (en) * | 1992-03-16 | 1992-05-07 | Dr. Spiess Kunststoff-Recycling Gmbh & Co, 6719 Kleinkarlbach, De | |
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KR200453957Y1 (en) | 2011-03-22 | 2011-06-13 | (주)로드텍 | Fixed pedestal with shock absorber replacement and shock absorbing |
WO2013132299A3 (en) * | 2012-03-06 | 2014-01-23 | Sabic Innovative Plastics Ip B.V. | Energy absorbing system for electric vehicle charging station and methods for making and using the same |
CN104160569B (en) * | 2012-03-06 | 2017-11-03 | 沙特基础全球技术有限公司 | Energy absorber system for electric motorcar charging station and production and preparation method thereof |
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WO2015051984A1 (en) * | 2013-10-07 | 2015-04-16 | Gerard Wolters | Impact-resistant and energy-absorbing item of street furniture |
GB2539763A (en) * | 2015-04-24 | 2016-12-28 | Mccue Corp | Sign post assembly with impact absorbing mechanism |
GB2539763B (en) * | 2015-04-24 | 2017-10-04 | Mccue Corp | Sign post assembly with impact absorbing mechanism |
US10077535B2 (en) | 2015-04-24 | 2018-09-18 | Mccue Corporation | Sign post assembly with impact absorbing mechanism |
CN107178052A (en) * | 2017-05-31 | 2017-09-19 | 青岛澳波泰克安全设备有限责任公司 | A kind of self- recoverage type anticollision barrier |
EP3741915A1 (en) * | 2019-05-21 | 2020-11-25 | Wonjin, Aluminium | One-way pivoting bollard |
FR3100533A1 (en) * | 2019-09-09 | 2021-03-12 | Global Industrial Security Systems | Protective device such as a stud or barrier in particular intended for the protection of shelving. |
CN112253399A (en) * | 2020-10-20 | 2021-01-22 | 潘铨 | Anti-impact offshore wind power generation equipment |
CN112253399B (en) * | 2020-10-20 | 2022-03-15 | 山西天宝集团有限公司 | Anti-impact offshore wind power generation equipment |
KR102595296B1 (en) * | 2023-03-21 | 2023-10-26 | 장정은 | Bollard for floor installation |
Also Published As
Publication number | Publication date |
---|---|
BE1018316A3 (en) | 2010-08-03 |
EP2267225B1 (en) | 2012-10-03 |
ES2396193T3 (en) | 2013-02-19 |
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