DE202021105122U1 - Measuring device for artificial turf - Google Patents

Abstract

Measuring device (1) for measuring at least one parameter of an artificial turf comprising
- a housing (2) which is designed to be open at least in some areas on at least one underside (21) of the housing,
- at least one scale element (4) which has at least one scale (41),
- at least one measuring element (5), which is relative to the housing (2) in a direction
which is oriented essentially perpendicularly to the underside (21) of the housing, is movably arranged and which has at least one pointer (51), and wherein the measuring element (5) has a probe (52) which can be moved beyond the underside (21) of the housing,
and the pointer (51) cooperates with the scale (41) to indicate the probe (52) projecting beyond the housing bottom (21).

Description

The invention relates to a measuring device for measuring at least one parameter of an artificial turf comprising a housing which is open at least in some areas on at least one underside of the housing and at least one scale element which has at least one scale. The measuring device further comprises at least one measuring element which is arranged to be movable relative to the housing in a direction which is oriented substantially perpendicular to the underside of the housing and which has at least one pointer and a probe which can be moved beyond the underside of the housing.

Artificial turf is an alternative to natural turf and is used, for example, for lawns on sports fields. Artificial turf has improved resistance to wear and tear compared to natural turf and can be walked on and used for activities with almost no regeneration breaks. This is particularly advantageous for sports fields that are to be used many hours a day. The properties of such an artificial turf are determined by various technical parameters that are consciously defined during the planning and are measured and checked during the implementation and use of the artificial turf for quality control.

Artificial turf includes artificial turf fibers which are typically similar in size and shape to natural grass blades. The artificial turf fibers are held by an artificial turf base or an artificial turf backing. The artificial turf fibers stand out essentially at right angles to the artificial turf ground. The structure of an artificial turf is similar to that of a carpet.

Filling material is filled in between the artificial turf fibers, which is also referred to as infill. The artificial turf fibers are partially embedded in the infill material and project upwardly above the infill material. The length that the artificial grass fibers protrude above the infill material affects the properties of the artificial grass. This free length of the artificial turf fibers affects, for example, the rolling behavior of a ball on the artificial turf. In addition, the thickness of the layer of infill material also affects the properties of the artificial grass. This so-called filling height influences, for example, how strongly an artificial turf cushions the impact of people or animals or the impact of objects. In order to ensure consistent properties of an artificial turf, the free length of the artificial turf fibers and the filling height of the filling material in particular must be checked regularly. Known measuring devices such as rulers are usually used to check or measure these parameters. A disadvantage of these known measuring devices, however, is that they can only be read with difficulty and inconvenience on the ground, and therefore an accurate measurement of these parameters takes a relatively long time.

The object of the invention is therefore to propose solutions with which the parameters of an artificial turf can be determined in a simple manner with little expenditure of time.

Main features of the invention are set out in claim 1. Configurations are the subject of claims 2 to 34.

• - ein Gehäuse, welches auf zumindest einer Gehäuseunterseite zumindest bereichsweise geöffnet ausgeführt ist,
• - zumindest ein Skalenelement welches zumindest eine Skala aufweist,
• - zumindest ein Messelement, welches relativ zum Gehäuse, in einer Richtung, die im Wesentlichen senkrecht zur Gehäuseunterseite orientiert ist, beweglich angeordnet ist und welches zumindest einen Zeiger aufweist, und wobei das Messelement eine Sonde aufweist, welche über die Gehäuseunterseite hinaus bewegbar ist,

und der Zeiger zur Anzeige der über die Gehäuseunterseite vorstehende Sonde mit der Skala zusammenwirkt.The object of the invention is achieved by a measuring device for measuring at least one parameter of an artificial turf

• - a housing which is designed to be open at least in some areas on at least one underside of the housing,
• - at least one scale element which has at least one scale,
• - at least one measuring element, which is arranged to be movable relative to the housing in a direction which is oriented essentially perpendicularly to the underside of the housing and which has at least one pointer, and wherein the measuring element has a probe which can be moved beyond the underside of the housing,

and the pointer cooperates with the scale to indicate the probe protruding from the bottom of the housing.

The measuring device according to the invention is suitable for measuring at least one parameter of an artificial turf. In addition, however, the measuring device according to the invention can also be used to measure parameters of other objects, for example a natural lawn or a carpet.

The measuring device according to the invention comprises a housing which is designed to be open at least in certain areas on the underside of the housing. The underside of the housing is to be understood as meaning the side which is placed on the surface of an artificial turf when the measuring device is used. The underside of the housing can be made up of several sub-areas, each of which is formed by different components of the housing. The underside of the housing is preferably composed of edge regions of housing elements which are arranged in a common plane. One An opening in the underside of the housing is provided for at least partially accommodating fibers of an artificial turf inside the measuring device. When the measuring device is used, the fibers of the artificial turf protrude into the interior of the measuring device, where one or more parameters of the artificial turf are then measured. The case of use is to be understood as meaning the case or state in which the measuring device is used to measure at least one parameter of the artificial turf. In use, the measuring device is placed on the surface of an artificial turf, with the underside of the housing coming into contact with the surface of the artificial turf. The actual measurement or determination of one or more parameters of the artificial turf then takes place in this placed state. The measuring device according to the invention comprises a scale element on which a scale is arranged. The scale element with the scale arranged on it serves as a reference for measuring the parameters of the artificial turf. The scale is formed by regularly arranged areas with different optical properties. For example, the scale can have lines running parallel to one another with different optical properties, which are arranged at regular intervals from one another. Parameters of the artificial turf are read on the scale. The scale element carries the scale and can have other components or elements in addition to the scale. The scale element and the scale can be oriented differently to the underside of the housing. In one possible embodiment, the scale is arranged essentially at right angles to the underside of the housing. Alternatively, it is possible to arrange the scale at a different angle relative to the underside of the housing. For example, the scale can be positioned at a 45° angle to the underside of the housing. Furthermore, the scale can also be aligned parallel to the underside of the housing. The scale element is shaped in such a way that it carries and fixes the scale in the desired orientation to the underside of the housing.

The measuring device according to the invention also includes at least one measuring element, which is movably mounted with respect to the housing. The measuring element is mounted in such a way that it can be moved relative to the housing in a direction that is oriented essentially perpendicularly to the underside of the housing. When used, the measuring device is placed with its housing underside on the surface of an artificial turf. In this case of use, the measuring element is then movably guided by the housing perpendicularly to the surface of the artificial turf. This enables the measuring element to be pushed into the surface of the artificial turf and used as a measuring probe. The measuring element comprises a probe which can be moved downwardly beyond the housing underside. The probe is intended to be at least partially inserted into an artificial turf when determining one or more parameters of the turf. Preferably, the end of the probe that protrudes beyond the underside of the housing is pointed, in order to facilitate insertion into the artificial turf. The sensing element further includes at least one pointer connected to the probe. The pointer serves to indicate the position of the measuring element relative to the housing, in particular to the underside of the housing, on the scale. A measured parameter of the artificial turf can be read at the location indicated by the pointer of the measuring element on the scale of the scale element. Thus, the pointer and the scale cooperate in measuring at least one parameter of the artificial turf. To measure a parameter of the artificial turf, the measuring element is moved relative to the housing until it reaches a position to be determined. In this state, a reading of the parameter is then displayed at the location where the pointer and scale interact. In addition, it is possible to measure other parameters solely with the help of the scale. The measuring element is not used or required to measure these further parameters.

A measuring device according to the invention has the advantage that it delivers reproducible, reliable results when determining parameters of an artificial turf. Due to the housing, the measuring device can be attached to the surface of an artificial turf and positioned there in a stable and simple manner. The housing ensures that the measuring device is automatically positioned correctly in relation to the surface of the artificial turf by gravity. The underside of the housing preferably rests on the surface of the artificial turf over a large area or at least at several points, as a result of which the connection between the measuring device and the artificial turf is statically determined. The application in which one or more parameters of the artificial turf are determined using the measuring device can thus be produced very simply by placing the measuring device on the surface of the artificial turf. Such a placement is reproducible and can be carried out in a simple manner with little expenditure of time at different locations on the artificial turf. In this way, a large number of parameters or measured values of an artificial turf can be reproducibly recorded in a short time. The interaction of the scale of the scale element with the pointer of the movable measuring element enables a simple and ergonomic determination of a parameter, which is determined physically by inserting the probe into the artificial turf. Such a parameter can be, for example, the height of the filling material, which is in or on applied to the artificial turf. This height of the filling material is also referred to as the filling height. To determine this filling height, the probe is pushed into the artificial turf until the artificial turf ground is reached. Reaching the artificial turf ground is haptically recognizable. The housing in which the movable measuring element is guided ensures that the probe moves at right angles into the artificial turf, which is important for correctly reading the infill height. When determining the filling height with known measuring plugs, there is always the danger that these measuring plugs are not inserted into the artificial turf at right angles to the artificial turf surface, as a result of which the measurement result is not correct. The measuring device according to the invention thus also improves the accuracy when determining parameters of an artificial turf. In addition, the scale enables other parameters to be determined, for example the length of the fibers of the artificial turf protruding beyond the infill material. This length is also referred to as the fiber height. A determination of fiber height can be made by optically overlaying the top of the fibers with the scale and then reading the fiber height from the scale. Such an optical superimposition will be described later. The measuring device according to the invention has a simple structure and comprises only a few components. As a result, the measuring device is easy to manufacture, has a low weight and is reliable and robust. As a result, the measuring device is easy to transport and easy to handle. In particular, it is provided that this can be assembled and disassembled without tools.

In one embodiment it is provided that the scale element is oriented essentially parallel or at right angles to the underside of the housing. The scale element can be oriented in different ways relative to the underside of the housing. In one embodiment, the scale element with the scale arranged thereon is oriented at right angles to the underside of the housing. Since, when in use, the fibers of the artificial turf usually protrude at right angles through the open underside of the housing, such an arrangement of the scale element enables the fiber height to be read off precisely and easily. In this case the fibers and the scale of the scale element extend parallel to each other. In an alternative embodiment, the scale element with the scale is arranged essentially parallel to the underside of the housing. This means that the scale, when in use, is arranged parallel to the surface of the artificial turf, which allows an observer to read it from above. In this alternative case, the movement of the probe, which is perpendicular to the case bottom, must be translated into a movement of the pointer, which is parallel to the case bottom. This can be achieved, for example, by arranging a flexible area in the measuring element between the probe and the pointer, which translates the movement of the probe into a movement of the pointer directed parallel to the underside of the housing via a corresponding guide. Such a flexible area can be formed, for example, by a thin sheet of spring steel, which is guided in a guide which has the shape of a quadrant in a side view. In this alternative embodiment, the pointer also moves in a plane parallel to the underside of the housing and displays a measured value for determining a parameter of the artificial turf on a correspondingly arranged scale.

In a further embodiment, it is provided that the measuring device comprises at least one reflection element, which is arranged on a different area of the housing than the underside of the housing and which has at least one light-reflecting reflective surface, the reflective surface being positioned at an acute angle relative to the underside of the housing, such that a viewer looking from above recognizes the position of the pointer on the scale via the reflecting surface. In this embodiment, the measuring device also includes a reflection element, which makes it easier to read the measured values. The reflection element is arranged in an area of the housing which differs from the underside of the housing. The reflection element is preferably arranged in the housing or, relative to the housing, opposite the scale element and measuring element. The reflection element comprises at least one reflection surface, which can be formed by a mirror, for example. This reflection surface is arranged at an acute angle to the underside of the housing. By arranging the reflecting surface in this way, a mirror image of the dial element and the pointer of the measuring element can be seen in the reflecting surface when an observer looks into the measuring device housing from a direction perpendicular to the housing underside. Thus, the reflection element enables an ergonomic reading of measured values from a position above the measuring device.

Furthermore, it is provided that an opening is arranged in the underside of the housing between the reflection element and the scale element, which is intended to accommodate artificial turf fibers in use, which are then located in the optical path between the reflection element and the scale element. In this embodiment, the dial element and the reflection element are arranged opposite to each other not. An opening is provided in the underside of the housing between these two elements, through which artificial turf fibers or fibers protrude into the housing of the measuring device when in use. When in use, these fibers are located between the reflection element and the scale element. In this way the fibers can be seen in a mirror image in the reflective surface in front of the scale. Thus, in the mirror image, the position at which the tops of the fibers are located relative to the scale can be seen, allowing the fiber height to be easily read using the scale. The opening in the underside of the housing can extend over the entire area between the reflection element and the scale element or only over a part of it.

Provision can be made for the scale element to have a movable scale part, possibly with its own scale, which is intended to be placed on the filling material when in use. In this embodiment, the scale element comprises a scale part arranged so as to be movable in relation to the remaining area of the scale element. This scale part is preferably movable in a direction perpendicular to the underside of the housing. In this way, the scale part can be placed on the artificial turf below the measuring device, independently of the rest of the housing of the measuring device. The artificial turf usually has fibers that protrude upwards over a filling material. The scale part can be moved in such a way that it penetrates past the protruding fibers and onto the filling material. A separate scale is preferably arranged on the movable scale part, the zero point of which is arranged on the edge of the scale part facing the underside of the housing. The zero point of the scale on the movable scale part can be placed on the surface of the filling material in a simple manner. This ensures that the scale always shows the fiber height from the actual surface of the fill material. Depending on the size and shape of the housing of the measuring device, it can happen that the housing and the underside of the housing rest at locations where the filling level differs from the location at which the immovable scale of the scale part is arranged. In this case, a measurement error occurs when measuring the fiber height. Such a measurement error can be compensated for by the additionally provided movable scale part. The movable scale part can be mounted so that it can move relative to other elements of the scale element, for example via a linear guide. Furthermore, a grip area can be provided, on which the movable scale part can be gripped and moved by a user

In an advantageous embodiment it is provided that the angle is essentially 45° relative to the underside of the housing or that the angular position of the angle of the reflection surface is adjustable. In this embodiment, the acute angle between the reflection surface and the case bottom is 45°. This angle is particularly advantageous because, due to the optical law, angle of incidence equals angle of reflection, a scale arranged perpendicular to the underside of the housing can be viewed as a mirror image in the reflection surface from a direction perpendicular to the underside of the housing, i.e. from above the measuring device. Such a viewing direction is particularly ergonomic when reading measured values. Alternatively, the angle between the reflection surface and the underside of the housing can also be designed to be adjustable. In this way, a user can himself set the line of sight which he prefers to take for reading off measured values.

It is cleverly provided that the underside of the housing is flat. Plan here means that the downwardly protruding areas or edges of the housing are arranged in a common plane. This ensures that when the measuring device is placed on an artificial turf surface, the underside of the housing runs parallel to the artificial turf surface, which is preferably also flat. Such a parallel alignment of the measuring device to the artificial turf surface leads to correct and reproducible measurement results of parameters of the artificial turf.

Furthermore, it is provided that the housing is designed to be open at least in regions on the upper side of the housing opposite the lower side of the housing. An observer can look into the interior of the housing through an opening in the top side of the housing, which is opposite the bottom side of the housing. This enables easy and ergonomic reading of measured values on the scale. The housing is preferably completely open on the upper side of the housing. To protect the measuring device, however, a cover can also be provided with which the top of the housing can be closed when the measuring device is not in use.

It is advantageously provided that the reflection element and the scale element each form areas of the housing. The reflective element and the dial element can be parts of and belong to the housing. In this case, the reflection element and/or the scale element each form a wall of the housing. In addition, further components or elements of the housing can be provided, which connect the reflection element to the scale element. Alternatively can the reflection element and/or the scale element can also be formed by an element which is independent of the housing and which is fastened to a wall or to a partial area of the housing.

Provision is preferably made for the housing to have at least one side wall, a frame or at least one connecting rod which connects the reflection element to the scale element. In this embodiment, the housing comprises at least one connecting element which connects the reflection element to the scale element. Such a connecting element can be formed, for example, by a side wall which is arranged between the reflection element and the scale element. Alternatively, the housing can also comprise a frame, which is preferably self-contained and carries the scale element and the reflection element. Finally, at least one connecting rod can also be provided as a connecting element, which connects the reflection element and the scale element to one another. It is also possible for the housing to include a combination of the connecting elements mentioned. The underside of the case rests on the surface of the artificial turf, which forms the sum of the areas of all parts of the case on the underside of the case. The bearing surface of the underside of the box should be small enough to allow penetration between the fibers of the artificial turf down to the surface of the infill material. For this reason, it is possible for the scale element and the reflection element to be connected by one or more connecting elements which are not arranged on the underside of the housing and therefore do not lie on the artificial turf when in use. In such an embodiment, the reflection element can be connected directly to the scale element, for example only by a connecting rod arranged on the top side of the housing. However, if the common surface of the underside of the housing resting on the artificial turf is very small, it can happen that the underside of the housing sinks into the filling material, which in turn falsifies a measurement of the filling height using the measuring element. For this reason, the connection elements of the housing can be arranged so that they form a proportion of the surface of the housing underside. This can be achieved, for example, by providing two housing walls connecting the scale element and the reflection element on opposite sides. These side walls extend to the underside of the housing and, when in use, lie on the filling material of the artificial turf surface. This ensures a long contact length of the bottom of the housing on the filling material, which in turn prevents the housing from sinking into the filling material. The design of the housing and its connecting elements can also be adapted to the type and composition of the filling material. In addition, it is possible to provide additional contact length or contact area on the underside of the housing, which can be plugged in, for example, via a plug connection or folded out via a folding mechanism. In this way, the surface of the underside of the housing can be changed individually and thus the bearing behavior of the housing on the artificial turf surface can be adjusted.

It is cleverly provided that the elements of the housing, in particular the scale element and the side wall, have thin walls, with the thickness of the elements of the housing being at least 10 times smaller than the length and width of these elements. Such a thin-walled design of the elements of the housing promotes the fact that the housing can be placed on the surface of the filling material between protruding synthetic turf fibers. Such a thin-walled housing penetrates the fibers and then lies flush with the underside of the housing on the surface of the filling material when in use. The wall thickness of the elements of the housing on the underside of the housing is preferably thinner than 1 mm. With such a thin-walled design of the elements of the housing, however, it must be ensured that there is a large contact length on the underside of the housing. If the contact length is small and at the same time the elements of the housing are designed with thin walls, there is a risk that the measuring device will sink into the filling material, which in turn leads to measuring errors when measuring the filling height.

In a preferred embodiment of the proposal, it is provided that the elements of the housing, in particular the scale element and the side wall, are formed from a material with a constant thickness, in particular sheet metal or plastic. Sheet metal is a suitable material for the elements of the housing and/or for parts of the dial element and/or the reflective element. Sheet metal is light and has a high rigidity and at the same time can be easily plastically formed. Alternatively, the housing and/or parts of the scale element and/or the reflection element can also be made of plastic, for example by injection molding. It is of course also possible, particularly when the elements are made of plastic, for the elements to have a varying thickness.

Provision is advantageously made for the housing to have a rectangular shape in a plan view perpendicular to the underside of the housing. A rectangular outer shape of the housing allows in simple way, an opposite, parallel arrangement of reflection element and scale element. Of course, other shapes of the housing are also possible, for example a polygonal shape.

Provision is preferably made for the scale element and the side wall and/or the reflection element and the side wall to be connected to one another by at least one connecting element, in particular a screw connection, preferably without tools. A screw connection has the advantage that it can be connected and disconnected again in a simple manner. As a result, when the measuring device is not in use, the housing can be dismantled and stored or transported in a space-saving manner. Particularly preferably, the screw connections can be connected and disconnected again without tools, for example by providing wing nuts or nuts with a knurled edge, which can be operated by hand. In addition, hinges or similar mechanisms can be provided between the individual components of the housing, which allow the device to be folded up to save space for transport and storage.

In an advantageous embodiment, it is provided that two side walls are provided, each of which is connected to the scale element and the reflection element, with the side walls, the scale element and the reflection element together forming a lateral surface which encloses the underside of the housing, which is open at least in certain areas. In this embodiment, the housing forms a closed shell around an opening in the bottom of the housing. This closed form of the housing makes it particularly stable. The housing is formed by a reflection element, a scale element and two side walls, the side walls being arranged opposite one another on the housing. It is particularly favorable in this embodiment to provide a separability between the side walls and the reflection element and the scale element. As a result, the device can be easily dismantled and stored and transported in a space-saving manner. The structure for use is very simple, since only four parts have to be connected to each other.

It is cleverly provided that at least a partial area of the opened housing underside is arranged between the reflection element and the scale. In this embodiment, the underside of the housing between the reflection element and the scale is open, whereby the fibers of the artificial turf protrude into the housing when in use and are in the optical path between the reflection element and the scale.

Furthermore, it is advantageously provided that the scale is arranged essentially at right angles relative to the underside of the housing. Such an arrangement of the scale at right angles to the underside of the housing enables an accurate reading of measured values which relate to elements of the artificial turf which also extend at right angles to the underside of the housing. Such elements are, for example, the fibers of the artificial turf.

In an advantageous embodiment it is provided that the reflection element has a carrier to which the reflection surface is attached and which carries the reflection surface. Such a carrier forms the supporting structure of the reflection element. The carrier can simultaneously serve as a connecting link between the reflection element and other housing parts, such as a side wall. The support may have a mechanism that allows the angle of the reflecting surface to be adjusted relative to the bottom of the housing.

It is advantageously provided that the reflection surface is formed by a mirror. Such a mirror can be formed, for example, by a glass plate with a reflective coating. Alternatively, the reflection surface can also consist of a polished metal sheet.

In a further embodiment it is provided that the carrier has a carrying area carrying the reflection surface and a fastening area adjoining it, the fastening area being arranged at an angle to the carrying area. In this embodiment, the carrier consists of two sections. These two partial areas can form a common component or they can be two different components which are connected to one another. The support area is arranged at the same angle to the underside of the housing as the reflection surface. The fastening area is preferably aligned at an angle thereto and parallel to the underside of the housing. In such an embodiment, the housing can be mounted in a simple manner and the fastening area can also serve as a handle for the housing. At the same time, the angle between the support area and the fastening area causes the housing to be stiffened by acting like a bead. As a result, the stability of the housing can be increased with a low weight. Furthermore, it is possible that the support area or the attachment area have at least one projection, which in a correspondingly shape-compatible recess in a Side wall can be inserted. This facilitates assembly of the housing with a reflective element correctly positioned at an angle. Of course, the carrier can also have a plurality of projections or recesses which interact in a form-fitting manner with projections or recesses in one or more side walls.

Furthermore, it is advantageously provided that the carrier has a grip area, which is provided for holding and positioning the measuring device, in particular with the grip area being designed as a recess in the carrier. Such a grip area makes it easier to hold and position the measuring device relative to the artificial turf. A recess, which forms the grip area, can be introduced, for example, in the fastening area and/or in the carrying area of the carrier. Of course, the measuring device can also be gripped and held in other areas of the housing. For example, the measuring device can be held and positioned at the upper edges of one or more side walls.

Furthermore, it is provided that the reflection surface is planar and the normal vector on the reflection surface is oriented at an angle to the normal vector on the planar scale. In this embodiment, the orientation of the reflection surface to the scale is described by its normal vectors. A normal vector is a vector that is perpendicular to a plane. The normal vector to the reflective surface is oriented at the same angle to the normal vector to the scale as the reflective surface is to the underside of the housing. In order to enable the scale to be read accurately across the entire width of the scale element, the reflective surface and the scale are both designed to be flat.

It is advantageously provided that the scale is formed by lines applied to the scale element or formed into the scale element, which are arranged at regular intervals parallel to one another in the unit millimeters and/or the unit inch and the scale includes inscriptions with numerical values. Such an embodiment facilitates the reading of the scale. The scale preferably comprises at least two sub-areas which are designed in different units of measurement, in particular in the units of measurement millimeters and inches. As a result, the measuring device can be used in different cultures in the units of measurement customary there.

Furthermore, the proposal advantageously provides that the scale element has a carrying area which carries the scale and the scale element also has a fastening area which adjoins the carrying area and which is arranged at an angle to the carrying area. In this embodiment, the scale element comprises a plurality of partial areas, which can be formed by a common component or by different components that are connected to one another. An angular arrangement and fastening of the fastening area on the carrying area results in a stiffening of the entire scale element and thus of the housing of the measuring device. The carrying area can carry the scale. Alternatively, the scale can also be printed on the carrying area. In addition, it is possible to arrange information on the measuring device, such as a type plate or manufacturer information, on the carrying area. Similar to the carrier of the reflection element, the carrying area and/or the fastening area of the scale element can also have projections or recesses which are shape-compatible with recesses or projections in an adjacent housing part, such as a side wall. This makes it easier to assemble the individual components of the measuring device in a precise position and increases their stability when in use.

It is advantageously provided that the front area of the probe of the measuring element, viewed in a direction away from the pointer, is designed to taper or taper to a point. In this embodiment, the probe can be pushed particularly easily into the filling material of an artificial turf. This has the advantage that only small forces are required to position the measuring element during the measurement, as a result of which the device is easy to operate and the device is only slightly mechanically stressed during the measurement.

Furthermore, it is advantageously provided that the display area is designed as a projection on or a recess in the pointer. The display area is designed in such a way that it clearly shows the measured value to be read. The display area can be formed, for example, by a projection tapering to a point. Alternatively, the display area can also be formed by a recess, for example a circular opening with a small diameter. Several display areas can also be arranged on the pointer, which, for example, point to partial areas of the scale with different units of measurement.

In one embodiment it is provided that the pointer is designed to be adjustable in its orientation relative to the other areas of the measuring element. An adjustability of the orientation of the pointer is preferably a rotatability of the pointer about an axis which is oriented perpendicularly to the surface of the scale. Such rotatability can, for example, point the display area in a first position to a sub-area of the scale in millimeters and in a second position to a sub-area of the scale in inches or inches. In order to rotate the pointer and thus change its orientation, it is preferable to overcome a limit torque in order to prevent the pointer from automatically changing its orientation unintentionally. It is also possible for the pointer to be rigid in its orientation relative to the other areas of the measuring element, for example if it is not necessary to switch between the display on two different scale areas.

Furthermore, it is provided that the measuring element has an operating area which protrudes in relation to the scale element and/or the housing and the operating area is intended for moving the probe. The operating area preferably forms an area of the measuring element which protrudes over the top of the housing when in use and is therefore easily accessible. When in use, the user of the device grips the measuring element at the operating area and initiates a movement in the measuring element via the operating area. If the measuring element is pushed into the housing via the operating area from above the top of the housing, the probe moves downwards over the bottom of the housing to the same extent and penetrates into the artificial turf when used. Conversely, once the measurement is complete, the measuring element can be pulled out of the artificial turf using the operating area. The operating area and the probe can form a common component. Alternatively, however, it is also possible for the operating area to be formed by a separate component which can be separated from the probe in a simple manner. As a result, when the measuring device is not in use, the operating area can be separated from the probe and stored inside the housing to save space.

It is cleverly provided that the measuring element can be moved with the probe against the restoring force of a spring. In this embodiment, a spring is provided in which a spring force is built up when the measuring element moves in the direction of the artificial turf. This spring force then counteracts the force required to push the probe into the infill material of the artificial turf. After the end of the measurement, the spring force generated pulls the measuring element back into its starting position, in which the probe is protected inside the housing or the scale element. This avoids accidentally damaging the sensitive probe when the measuring device is lifted off the artificial turf. Such a spring can, for example, be fastened with a first end to the probe, the pointer or the operating area and be fastened with a second end to a stationary sub-area of the scale element. The spring can be a compression spring, a tension spring or a spiral spring. The spring can consist of metallic elements such as spring steel. Alternatively, the spring can also be made of plastic or rubber.

Provision is advantageously made for the operating area to be arranged on the side of the pointer opposite the probe. In this embodiment, the pointer is arranged between the operating element and the probe. The pointer can be attached either to the operating area, or to the probe, or to both elements. This arrangement means that the operating area, which extends on the opposite side to the probe, can be reached particularly easily from above the housing. However, the operating area can also be arranged at an angle, for example at a right angle to the probe, in which case the pointer is preferably attached to the probe.

Furthermore, it is advantageously provided that the operating area penetrates the scale element, in particular its attachment area. In this embodiment, the operating area is guided by the scale element. A clearance fit is provided between the two components, which allows a relative movement between the operating area and the scale element. This penetration of the operating area by the scale element acts as a bearing and guide for the operating area. In this way, additional storage or guide elements can be saved.

Furthermore, it is advantageously provided that the scale element has a linear bearing for the measuring element, with this linear bearing leading to a movement of the measuring element in a direction essentially perpendicular to the underside of the housing. Such a linear bearing can be designed in various ways. For example, similar to the embodiment described above, a linear bearing can be formed in that the scale element has one or more recesses and the measuring element is guided through these recesses with a loose fit. In this embodiment, the linear bearing is particularly easy to manufacture. Alternatively, a linear bearing can also be formed as a result be that in the scale element a slot is introduced, the longer dimension is aligned perpendicular to the bottom of the housing. The measuring element can have a sliding element, which is firmly connected to the other areas of the measuring element and is introduced with a loose fit into the elongated hole in the scale element. The linear bearing takes place through the elongated hole, which guides the sliding element of the measuring element. In general, different types of linear bearings are suitable, which lead a movement of the measuring element relative to the scale element reliably and with low frictional forces. The linear bearing is preferably designed in such a way that the measuring element can be separated from the scale element and the housing. Such separability may be required to repair or replace a damaged sensing element.

Provision is optionally made for the pointer to be adjustable in its position relative to the probe. The position relative to the probe is to be understood here in particular as the position in a direction perpendicular to the underside of the housing. Such an adjustability of the position of the pointer relative to the probe can be used for calibration of the measuring device. For such a verification or calibration, the fixed connection that exists between the probe and the pointer when in use is released. The tip of the probe is then positioned flush with the underside of the housing. The pointer is then moved in a direction perpendicular to the underside of the housing until its display area shows a desired reference value, in particular zero, on the scale. In this state, the pointer is then fixed in its position relative to the probe. A repeated verification or calibration can be carried out, for example, when the probe is worn out or another reference value is to be set.

It is provided that the measuring device is designed as an artificial turf measuring device, in particular as an infill height measuring device, as a fiber height measuring device, or as a combined infill height and fiber height measuring device. It is particularly advantageous if the measuring device is designed as a combined filling height and fiber height measuring device. As a result, two important parameters of an artificial turf can be determined ergonomically and quickly with a single device. It is of course also possible to integrate further components and functions into the measuring device, which allow further parameters of the artificial turf to be determined. For example, it is possible to provide a controller and a memory, as well as measuring sensors, which automatically determine the parameters when used and store them in a memory. This further simplifies the operation of the measuring device and makes it easier to evaluate the measured parameters.

Also disclosed is the use of a measuring device according to one or more of the above-described embodiments for measuring the fiber height parameter, the fiber height being the free-standing length of the fibers of the artificial turf above the filling material, and the filling height parameter, the filling height being the height of the filling material above the Artificial turf ground is. Such a use of the measuring device is advantageous because it allows the parameters mentioned to be determined in a simple and reproducible manner. Due to the properties of the measuring device described above, this is tailored to the determination of the parameters fiber height and filling height. The use of the measuring device to determine the named parameters of an artificial turf enables an efficient quality control of an artificial turf, for example after its production or also during its use.

1. A) Aufsetzen der Messvorrichtung auf das Füllmaterial des Kunstrasens, wobei die Gehäuseunterseite zum Kunstrasen hin orientiert ist und wobei mehrere Fasern des Kunstrasens durch den geöffnet ausgeführten Bereich der Gehäuseunterseite in das Gehäuse einstehen,
2. B) Einnehmen einer ersten Blickposition durch einen Betrachter, wobei die erste Blickposition eine Position oberhalb des Kunstrasens und der Messvorrichtung sowie in einer Richtung senkrecht zur Oberfläche des Kunstrasens oberhalb der Reflexionsoberfläche ist,
3. C) Ablesen der Faserhöhe, wobei die Faserhöhe die freistehende Länge der Fasern des Kunstrasens über dem Füllmaterial ist, in dem durch die Reflexionsoberfläche bereitgestellten Spiegelbild, welches die Skala und die in das Gehäuse einstehenden Fasern zeigt, wobei die sich die Faserhöhe an den Orten ergibt, wo sich die vom Kunstrasengrund weg gewandten Enden der Fasern mit der Skala optisch überlagern,
4. D) Bewegung des Messelementes in einer Richtung im Wesentlichen senkrecht zum Kunstrasengrund in das Füllmaterial hinein, wobei die Sonde in das Füllmaterial eindringt, solange bis die von der Gehäuseunterseite wegweisende Spitze der Sonde auf dem Kunstrasengrund aufsteht,
5. E) Einnehmen einer zweiten Blickposition durch einen Betrachter, wobei die zweite Blickposition eine Position oberhalb des Kunstrasens und der Messvorrichtung sowie in einer Richtung senkrecht zur Oberfläche des Kunstrasens oberhalb der Reflexionsoberfläche ist,
6. F) Ablesen der Einfüllhöhe, wobei die Einfüllhöhe die Höhe des Füllmaterials über dem Kunstrasengrund ist, in dem durch die Reflexionsoberfläche bereitgestellten Spiegelbild, welches die Skala und den Zeiger zeigt, wobei die sich die Einfüllhöhe an dem Ort ergibt, wo sich der Anzeigebereich des Zeigers mit der Skala optisch überlagert.

Also disclosed is a method for measuring multiple parameters of an artificial turf using a measuring device according to one of the previously described embodiments, comprising the steps

1. A) placing the measuring device on the filling material of the artificial turf, with the underside of the housing being oriented towards the artificial turf and with several fibers of the artificial turf projecting into the housing through the open area of the underside of the housing,
2. B) assuming a first viewing position by an observer, the first viewing position being a position above the artificial turf and the measuring device and in a direction perpendicular to the surface of the artificial turf above the reflection surface,
3. C) Reading the fiber height, where the fiber height is the free-standing length of the fibers of the artificial turf above the infill material, in the mirror image provided by the reflecting surface showing the scale and the fibers protruding into the housing, giving the fiber height at the locations , where the ends of the fibers facing away from the artificial turf ground optically overlap with the scale,
4. D) Movement of the measuring element in a direction essentially perpendicular to the artificial turf into the filling material, with the probe penetrating into the filling material until the tip of the probe pointing away from the underside of the housing rests on the artificial turf,
5. E) assuming a second viewing position by an observer, the second viewing position being a position above the artificial turf and the measuring device and in a direction perpendicular to the surface of the artificial turf above the reflection surface,
6. F) Reading the in-fill height, the in-fill height being the height of the in-fill material above the artificial turf ground, in the mirror image provided by the reflective surface showing the scale and pointer, the in-fill height being at the location where the pointer's indicating area is optically overlaid with the scale.

The disclosed method serves to measure several parameters of an artificial turf. However, the method can also be used to measure other parameters, for example parameters of a natural turf. The process is preferably carried out in the specified order of process steps A) to F). However, it is also possible to change the order of method steps, for example method steps D), E) and F) can be carried out before method steps B) and C).

In a first method step A), the measuring device is placed with its housing underside on the surface of the filling material of the artificial turf. In this case, several fibers of the artificial turf protrude into an open area, for example an opening in the underside of the housing, and are then partially located inside the housing. When placing the measuring device, care is taken to ensure that it is stable and statically determined on the surface of the artificial turf.

The determination of the fiber height parameter is described below. However, the later-described determination of the filling height parameter can also be carried out first, i. H. be made prior to determining the fiber height. In a second method step B), an observer or the user of the measuring device assumes a first viewing position, which is located above the measuring device. From this first viewing position, the viewer looks at the reflection surface of the reflection element. The ends of the fibers pointing upwards are in this state between the reflection element and the scale. In the reflection element, the viewer sees a mirror image on which the fibers in front of the scale can be seen. In a third method step C), the observer reads the measured value for the fiber height, which results at the locations at which the upper ends of the fibers of the artificial turf optically overlap with the scale. If necessary, the observer can also determine several measured values, in particular of fibers that are located at different locations inside the housing. The readings can be noted or entered into a storage device. If the reflection element is designed to be adjustable, the viewer can adjust the angle of the reflection surface to the underside of the housing when reading the measured values in such a way that the reading is particularly ergonomic and comfortable for the viewer.

In a fourth method step D), the measurement of the filling height parameter is started. To do this, the measuring element is moved out of the housing and into the filling material of the artificial turf in a direction perpendicular to the artificial turf and/or the underside of the housing until the downward-pointing tip of the probe rests on the artificial turf or hits it. In this position, the probe is then pressed into the filling material over the entire filling height. In order to read off the measured value for the filling height, in a fifth method step E) the observer assumes a second viewing position, which is also located above the measuring device. In the second viewing position, the viewer recognizes the pointer of the measuring element and the scale of the scale element in the mirror image of the reflection surface. Depending on the geometric relationships between the fiber height and the filling height, it is also possible for the first viewing position and the second viewing position to be identical. The first viewing position and the second viewing position are preferably at least close to one another in order to enable both parameters to be measured quickly one after the other. If the angle of the reflection surface to the underside of the housing is adjustable, the viewer can also adjust the angle of the reflection surface instead of changing the viewing position in order to be able to recognize the pointer and the scale in the mirror image. In a sixth method step F), the measured value for the filling level is read at the point where the display area of the pointer and the scale optically overlap. This reading is done by looking at the mirror image in the reflecting surface.

It is possible that the measuring device does not have a reflection element with a reflection surface. In this embodiment, the pointer and the scale are preferably arranged on the top of the housing. To read a measured value from a measuring device according to such an embodiment, the viewer looks from a viewing position from above the measuring device directly at the pointer and the scale and reads the measured value for the filling level where the display area of the pointer and the scale optically overlap.

According to a further embodiment of the measuring device, a movable scale part with its own scale for measuring the fiber height can be provided. In this embodiment, before the fiber height is measured in method step C), the movable scale element is moved relative to the housing of the measuring device in such a way that the zero point of the scale is seated on the surface of the filling material. After the movable scale part has been placed on the filling material, method step C) is carried out.

The method described can be carried out easily and quickly and leads to a reproducible determination of at least two parameters of an artificial turf. By using the measuring device according to the invention, the scale and the probe of the measuring element are always correctly and repeatably positioned in relation to the surface of the artificial turf. This makes it possible to determine meaningful, precise measurement values for the parameters of the artificial turf.

In one embodiment of the method, it is provided that before method step D), the display area of the pointer is adjusted relative to the scale, with the end of the probe area facing away from the pointer being positioned congruently with the edge of the scale element adjoining the underside of the housing, and then the display area being set in this way is that it indicates a desired reference value, in particular zero, on the scale. In this embodiment of the method, the measuring device is gauged or calibrated before the actual measurement of the parameters. This calibration is preferably carried out before the measuring device is used in the case of use, in particular before carrying out method step A). However, calibration can also be carried out in use. During calibration, the end of the probe pointing downwards is brought into a congruent position with the surface of the underside of the housing and then the pointer on the measuring element is adjusted so that it displays a desired reference value, for example zero. Such a calibration is particularly necessary when the probe is worn out or a part of the measuring device has been replaced.

In a further embodiment of the method, it is provided that the scale has partial areas with different units of measurement, in particular in the units of measurement millimeters and inches, and before method step D) the pointer is adjusted in its orientation relative to the other areas of the measuring element such that the display area points to the section of the scale in which the measurement result is to be read. In the case in which the measuring device has a pointer with a display area, but the scale has sub-areas in different units of measurement, the pointer is adjusted in its orientation relative to the other areas of the measuring element before the measurement so that it points to the scale area with of the desired unit. This method step can be omitted if the pointer has two display areas, one of which points to a partial area of the scale.

Features, effects and advantages that are disclosed in connection with the measuring device are also deemed to be disclosed in connection with the method. The same applies in reverse, features, effects and advantages which are disclosed in connection with the method are also deemed to be disclosed in connection with the measuring device.

• 1 eine perspektivische Ansicht einer Ausführungsform einer erfindungsgemäßen Messvorrichtung,
• 2 eine Seitenansicht der Ausführungsform einer erfindungsgemäßen Messvorrichtung aus 1, welche auf einem Kunstrasen aufgesetzt ist,
• 3 eine Draufsicht auf die Ausführungsform einer erfindungsgemäßen Messvorrichtung senkrecht zur Schnittebene III in 1, wobei die Sonde über die Gehäuseunterseite vorsteht.

Further features, details and advantages of the invention result from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. Show it:

• 1 a perspective view of an embodiment of a measuring device according to the invention,
• 2 a side view of the embodiment of a measuring device according to the invention 1 , which is placed on an artificial turf,
• 3 a plan view of the embodiment of a measuring device according to the invention perpendicular to the section plane III in 1 , with the probe protruding beyond the bottom of the case.

The same elements are provided with the same reference symbols in the figures. In general, the properties of an element that are described for one figure also apply to the other figures. Directional information such as above or below relates to the figure described and is to be transferred to other figures accordingly.

1 shows a perspective view of an embodiment of a measuring device 1 according to the invention. The measuring device 1 shown obliquely from above comprises a housing 2 which forms the base of the measuring device 1 . The housing has a housing underside 21 which is oriented downwards in the illustration and is intended to be placed on the surface of an artificial turf when in use. The case of use is to be understood as meaning the case or state in which the measuring device is used to measure at least one parameter of the artificial turf. The bottom of the housing 21 runs in one level and is therefore flat. Since the surface of an artificial turf is also designed to be essentially flat or planar, the housing underside 21 rests flush on the artificial turf when the measuring device 1 is placed on the latter. This ensures that the measuring device 1 rests on the artificial turf in a stable, motion-free manner, which is important for a reproducible measurement of one or more parameters of the artificial turf. Large parts of the housing underside 21 are designed to be open, for example the opening 211, which in the illustrated embodiment is surrounded on four sides by the housing or by other elements. This opening 211 is intended to accommodate synthetic turf fibers, also called pile fibers, when the measuring device 1 is applied to the artificial turf. In use, the synthetic grass fibers protrude through the opening 211 into the interior of the housing 2 and then are in the optical path between the scale element 4 and the reflection element 3. These elements will be described later. The upper side 22 of the housing is arranged on the housing opposite the lower side 21 of the housing. In the illustrated embodiment, this housing top 22 is also designed to be mostly open or open. Through the open areas of the housing top 22, both the opening 211 in the housing bottom 21 and the scale element 4 and the reflection element 3 are clearly visible to an observer from above.

A scale element 4 is arranged on the side of the housing 2 pointing to the rear right in the illustration. This scale element 4 can be part of the housing 2 or attached to the housing 2 as an additional element. The scale element 4 comprises a scale 41 which, in the illustrated embodiment, points to the front left. In the illustrated embodiment, the scale 41 is arranged at right angles to the underside 21 of the housing and to the opening 211 . However, alternative embodiments are also conceivable, in which the scale is arranged at a different angle relative to the underside 21 of the housing. In the illustrated embodiment, the scale 41 is formed by lines oriented parallel to the underside 21 of the housing, which are printed on the scale element 4 at regular intervals from one another. However, alternatively or additionally, the lines of the scale 41 can also be embossed three-dimensionally into the scale element 4 . In the embodiment shown, the scale 41 has different groups of lines on both sides of the measuring element 5 . On one side of the measuring element 5 the lines are spaced apart from one another in units of millimeters, on the other side of the measuring element the lines are spaced apart from one another in units of inches or inches. The lines can of course also indicate intermediate levels, for example the lines can be arranged in the unit millimeter at a distance of tenths of a millimeter. The scale 41 interacts with the pointer 51 of the measuring element 5 when measuring a parameter of the artificial turf. In the illustrated embodiment, the scale 41 is flat. Alternatively, however, the scale 41 can also be curved. In addition to the scale 41 , the scale element 4 includes other components. The carrying area 42, which in 2 can be seen, carries the scale 41. In the illustrated embodiment, the carrying area 42 is formed by a flat metal sheet which is oriented perpendicularly to the underside 21 of the housing. The scale 41 is attached to the support area 42, for example by means of an adhesive connection. A fastening area 44 adjoins the carrying area 42 and is oriented here at right angles to the carrying area 42 . In the illustrated embodiment, the support area 42 and the attachment area 44 are formed by a common metal sheet which is folded in the boundary area between the support area 42 and the attachment area 44 . The attachment area 44 serves to connect to elements of the housing, here with the two side walls 23. The attachment area 44 can also be used as a handle to transport the measuring device 1 or to position it on an artificial turf. The components of the scale element 4, namely the scale 41, the support area 42 and the fastening area 44 can alternatively also be formed by a single common component. In addition to the embodiment described, in which the elements of the scale element 4 are made of sheet metal, they can of course also be made of plastic or another suitable material.

The measuring element 5 is movably connected to the scale element 4. The measuring element 5 comprises a probe 52 which is located in the in 1 state shown is inside or behind the scale element 4. The probe 52 is intended to be inserted into the infill material of an artificial turf in order to determine the filling height of the infill material. The portion of the probe that is shown pointing downwards is tapered or tapered to facilitate insertion into the fill material. This is also in 3 clearly visible. In the illustration above the probe 52, adjacent to the probe 52, the pointer 51 is arranged. This pointer 51 is intended to indicate an area on the scale 41 which corresponds to the distance of the probe 52 advanced beyond the underside 21 of the housing. Such a state that the probe 52 is moved beyond and protrudes from the case bottom is in 2 to see. The pointer 51 has a display area 511 pointing to the right in the representation, which is directly connected to the Scale 41 cooperates to indicate the measurement of a parameter of the artificial turf. As an alternative to the illustrated embodiment, the pointer 51 can also have two display areas 511 , one of which points to the scale 41 arranged to the left of the measuring element 5 and one to the scale arranged to the right of the measuring element 5 . The pointer 51 is designed to be adjustable in its position relative to the probe 52 . On the one hand, it is possible to move and fix the pointer 51 relative to the probe 52 in a direction perpendicular to the underside 21 of the housing. In this way, the pointer 51 can be adjusted as the tip of the probe 52 wears. By shifting the relative position of the pointer 51 to the probe 52, a normalization or calibration can also be carried out, which results in the pointer 51 indicating a value of zero on the scale 41 when the downwardly pointing tip of the probe 52 is flush with the bottom of the housing 21 closes. In the illustrated embodiment, the pointer 51 is also made rotatable relative to the probe 52 . As a result, the pointer 51 can be adjusted in its orientation relative to the other areas of the measuring element 5 . The pointer 51 is designed here to be rotatable on an axis perpendicular to the scale 41, as a result of which the display area 511 can be oriented both to the right part of the scale 41 and to the left part of the scale 41. This allows the display area 511 to be used either to display a reading on the left portion of the scale 41, thereby displaying a value in inches or inches. Alternatively, the display area 511 can be used to display a measured value on the right part of the scale 41 to display a measured value in millimeter units. The measuring element 5 also has an operating area 53 which is arranged on the side of the pointer 51 opposite the probe 52 . As a result, the operating area 53 is formed as a rectangular element, the area of which points upwards in the illustration is angled backwards. This angled area forms a handle and facilitates the operation or movement of the operating area 53. When in use, the measuring element 5 is moved downwards by introducing a force into the operating area 53 in a direction perpendicular to the underside of the housing 21, with the probe 52 moving out of the scale element 4 is moved. At least when in use, the operating area 53 and the probe 52 are therefore rigidly connected to one another. When the operating area 53 is pushed into the scale element 4, the probe 52 is moved beyond the underside of the housing 21 and, when used, penetrates into the filling material of the artificial turf. In the representation in 1 It can be seen that the operating element 53 protrudes from the housing 2 when the probe 52 is arranged inside the scale element 4 . Since the operating area 53 can be easily damaged in this state, it can be provided that the probe 52 and the operating element 53 are detachably connected to one another. For this purpose, it can be provided that the operating area 53 is connected to the probe 52 via a plug-in connection, which can be disconnected when the device is not in use. Such a plug-in connection can be secured, for example, by a non-positively acting spring, which connects the probe 52 and the operating area 53 up to a certain limit force. However, the plug-in connection can be released if this limit force is overcome by pulling the operating area 53 out of the probe 52. In this case, the pulled-out operating section 53 can be stored in a place protected by the housing 2 inside the measuring device 1 for transport or during non-use of the measuring device. Because the probe 52 is made thin to allow for easy insertion into the fill material, there is a risk of accidentally damaging the probe 52 when not inserted into the fill material. In order to avoid such damage, a mechanism can be provided which always positions the measuring element 5 in such a way that the probe 52 is arranged completely inside the scale element 4 and is thus protected as long as the operating section 53 is not operated. Such a mechanism can, for example, comprise a tension spring which is connected on the one hand to the probe 52 and on the other hand to the scale element 4, for example to its fastening area 44. This tension spring keeps the measuring element 5 in the state shown in FIG. If the operating area 53 together with the probe 52 starting from the in 1 moves the state shown down, the tension spring is stretched, whereby a restoring force is generated. If the operating area 53 is released after the end of use of the measuring device 1, the restoring force, which is present in the tension spring, pulls the measuring element 5 back into position in 1 position shown, the probe 52 being protected inside the scale element 4. Of course, a protective mechanism that works in this way against damage to the probe 52 can also have a different design than that described above. A linear bearing is arranged between the measuring element 5 and the scale element 4 , which guides a movement of the measuring element 5 relative to the scale element in a direction perpendicular to the underside 21 of the housing. This linear bearing can be designed as a slide bearing, for example. A portion of this linear bearing can be integrated into the support area 42 or the attachment area 44 or be connected to these areas. In the illustrated embodiment, an opening is provided in the fastening area 44 of the scale element 4, through which the operating area 53 of the measuring element 5 penetrates. The fair element 5 is thus passed through the scale element 4. Alternatively, it would also be possible to mount and guide the measuring element 5 between the scale 41 and the support element 42 or on the scale 41 . In the illustrated embodiment, the probe 52 and the operating portion 53 are made of sheet metal and the pointer 51 is made of plastic. Of course, these elements can also be made of other suitable materials.

A reflection element 3 is arranged on the side of the housing 2 opposite the scale element 4 . The opening 211 is located in the housing underside 21 between the reflection element 3 and the scale element 4. The reflection element 3 comprises several components: oriented to the rear right in the illustration is a reflection surface 31, which can be formed by a mirror, for example. The reflection surface 31 is arranged on a support 32 . This support 32 includes a support portion 321 which supports the reflection surface 31 and a mounting portion 322. The mounting portion 322 is adjacent to the support portion 321 is located. In the illustrated embodiment, the attachment portion 322 and the support portion 321 together form a common component. The reflection element also has a grip area 323 which is designed as an opening or recess in the carrier 32 . The grip area 323 can penetrate through the fastening area 322, the carrying area 321 or both of these areas. The grip area 323 is provided so that a user can grip the measuring device 1 securely and position it on an artificial turf. The reflection element 3 is shaped in such a way that the reflection surface 31 is oriented at an acute angle a relative to the underside 23 of the housing. In this way, an observer looking into the measuring device 1 through the housing top 22 can see the scale 41 as a mirror image in the reflection surface 31 . Details on the arrangement of the reflection surface 31 and the use of the measuring device 1 are available 2 described.

The housing 2 of the illustrated embodiment of a measuring device 1 further comprises two side walls 23 and a total of four connecting rods 24. The side walls 23 connect the reflection element 3 to the scale element 4 and position these two elements relative to one another. It would also be possible to provide only one side wall 23 for such positioning. The connecting rods 24 serve as connecting elements or fastening elements between the side walls 23, the reflection element 3 and the scale element 4. The connection rods 24 are guided through openings in the side walls 23 and through openings in the reflection element 3 and in the scale element 4. The connecting rods 24 have external threads at both of their ends, onto which nuts are screwed, which pull the components together and thus fix them. Alternatively, the reflection element 3, the scale element 4 and the side walls 23 can also be connected to one another via other connection elements, for example clip connections, plug connections or the like. In the illustrated embodiment, the housing 2 has a rectangular shape in a plan view of the underside of the housing. The housing, which is formed here by the two side walls 23, the scale element 4 and the reflection element 3, forms an inwardly oriented lateral surface in the illustrated embodiment, which completely encloses the opening 211 of the housing underside 21. Such a housing 2 is stable and at the same time has a low weight. All components of the housing 2 are designed with thin walls. This means that the thickness of the components is significantly less, in particular less by a factor of ten, than the length and the width of these components. Such a thin-walled design of the housing 2 makes it easier to place the measuring device on an artificial turf where the fibers of the artificial turf protrude upwards. The thin-walled walls of the housing 2 can be placed in a simple manner between the artificial turf fibers on the surface of the filling material.

2 12 shows a side view of the embodiment of a measuring device 1 according to the invention 1 , which is placed on an artificial turf. In 2 If the measuring device 1 is shown in a side view on the 1 forward facing side wall 23 shown. The side wall 23 is shown transparent, so that the reflection element 3 behind it and the scale element 5 can be seen. In contrast to 1 the gauge is 1 in 2 placed on an artificial turf. The measuring device 1 rests on the surface of the filling material F with its housing underside 21 . The filling material F can include sand and/or rubber granulate, for example. The filling material F is applied to the artificial turf base KG, which can be formed by concrete or asphalt, for example. An important parameter for assessing the quality of an artificial turf is the filling height EH, which represents the height of the filling material F. The filling height EH is the distance between the surface of the artificial turf KG and the upward-pointing surface of the filling material F. In the filling material F, some synthetic turf fibers are shown as an example below the measuring device 1, which are referred to below as fibers FA. These fibers FA are fixed in or on the artificial turf base KG and extend through the filling material F. In the illustrated application of the measuring device 1 , the fibers FA protrude through the opening 211 into the interior of the housing 2 . The upper ends of the fibers FA are located between the reflection element 3 and the scale element 4. The fibers are located at least partially in the optical path between the reflection surface 31 and the scale 41. In the in 2 State shown, the measuring element 5 was based on the in 1 state shown pushed down by operating the operating area 53. During this downward movement, the probe 52 was pushed out over the housing underside 21 and penetrated into the filling material F. The measuring element 5 was moved downwards until the downward-pointing tip of the probe 52 struck the artificial turf KG. The length of the probe 52 protruding downwards over the underside 21 of the housing thus corresponds to the filling height EH. The pointer 51 indicates precisely this filling height EH on the scale 41 arranged directly adjacent. Details of this ad are in 3 to see. In the illustrated embodiment, the measuring element 5 with the pointer 51 and the scale 41 are oriented essentially perpendicularly to the underside of the housing 21 and to the surface of the artificial turf, which makes it difficult to read the display without additional aids. In order to facilitate reading of the display, the reflective element 3 and in particular its reflective surface 31 is used.

In the illustrated embodiment, the carrier 32 of the reflection element 3 is flat. The largest surface of the carrier 32, which points to the top right in the illustration, carries the likewise planar reflection surface 31, which is designed as a mirror. The reflection surface 31 is positioned at an acute angle α to the housing bottom 21 . An acute angle is to be understood as meaning an angle between 0° and 90°. In the illustrated embodiment, the angle a is 45°. In the illustrated embodiment, the angle a is permanently dictated by the design of the components of the housing. In an alternative embodiment, however, the angle α can also be designed to be adjustable, for example in that the carrier 32 is designed to be rotatable about an axis perpendicular to the plane of the drawing. The orientation of the reflection surface 31 to the scale 41 can also be described by using the normal vector N1 on the reflection surface 31 and the normal vector N2 on a scale 41 which is designed to be planar. In this description, the normal vector N1 is oriented at an acute angle α to the normal vector N2. In the illustrated embodiment, this acute angle α between the two normal vectors N1 and N2 is 45°. Such an angle enables a vertically oriented planar scale 41 to be read from a likewise vertically oriented viewing direction from above into the measuring device 1 . Advantageously, the angle α is also adjustable, for example in an interval of 25-70°, or particularly advantageously of 30-60°.

The illustrated embodiment of a measuring device 1 can be used to determine two different parameters of an artificial turf. These parameters are the filling height EH and the fiber height FH. First, the determination of the filling level EH with the aid of or using the measuring device 1 is described. In the state shown, the measuring element 5 is positioned relative to the scale element 4 in such a way that the probe 52 protrudes beyond the underside 21 of the housing and rests on the artificial turf base KG. The protruding length of the probe 52 beyond the housing bottom 21 is indicated by the pointer 51, in particular by its display area 511 on the scale 41. In order to be able to read this display, a viewer assumes the viewing position P2. From this viewing position P2, the observer looks vertically downwards at the reflection surface 31. A mirror image of the pointer 51 and the scale 41 can be seen in the reflection surface 31. In the illustration, the optical paths from the viewing position P2 to the reflection surface 31 and from the reflection surface 31 to the pointer 51 are shown in dashed lines. From the viewing position P2, the observer can easily read the indication of the pointer 51 on the scale 41 from above in the mirror image and thereby determine the filling level EH. What is particularly advantageous about the measuring device 1 is that the observer can read the measured filling height EH parameter ergonomically from a position above the measuring device 1 .

With the illustrated embodiment of a measuring device 1, the fiber height FH parameter can also be measured in an ergonomic manner. To measure the fiber height FH, the observer or user of the measuring device 1 goes to the viewing position P1 and looks from there vertically downwards at the reflection surface 31. From the viewing position P1, the upper ends of the fibers FA are in the mirror image in the reflection surface 31 to recognize. Furthermore, the scale 41 can be seen in the background of the mirror image. The fibers FA are thus located in front of the scale 41 in the mirror image. The fiber height FH can thus be read in the mirror image at the location or locations at which the ends of the fibers FA optically overlap with the scale 41 . In the design of the measuring device 1, the dimensions of the measuring element 5 are preferably chosen such that the pointer 51, with the probe 52 protruding from the artificial turf KG, is close to the height at which the fibers FA protrude into the measuring device 1 from below . In this way, the two viewing positions P1 and P2 are very close to each other and the user of the measuring device 1 can read both parameters with only a very small movement from the first viewing position P1 to the second viewing position P2. Of course, the position of the pointer 51 relative to the scale 41 depends on the filling height EH, so that the distance between the two viewing positions P1 and P2 differs depending on the size of the filling height EH.

In the representation in 2 the carrier 32 of the reflection element 3 can be seen in a side view. It is easy to see here that the supporting area 321 and the fastening area 322 adjoining it are formed by a common component which carries the reflection surface 31 . The carrier 32 is positively connected to one or both side walls 23 and is thus held in a constant position in the housing 2 . The design of the scale element 4 can also be seen in the side view. The support area 42 and the fastening area 44 form a common component here. The scale 41 is formed by an imprint on the carrying area 42 . The probe 52 and the operating area 53 of the measuring element 5 are formed by a common component. Alternatively, the probe 52 and the operating area 53 can also be formed by two different components that can be separated from one another.

3 shows a plan view of the embodiment of a measuring device 1 according to the invention perpendicular to the section plane III in 1 , wherein the probe 52 projects beyond the housing bottom 21. In 3 14 is a plan view of the sectional measuring device 1 from a direction perpendicular to the sectional plane III 1 to see. In the illustration, the in 1 The part of the measuring device 1 shown below on the left with the reflection element 3 cannot be seen. 3 thus shows a plan view of the scale 41 from a direction perpendicular to this scale 41. It can be seen that the inscription on the scale 41 is mirror-inverted. As a result, when viewed by an observer as a mirror image in the reflecting surface 31, the scale 41 appears in the correct, familiar representation. in the in 3 The state shown is the measurement element 5 compared to that in 1 State shown shifted down, so that the probe 52 protrudes beyond the bottom 21 of the housing. This state roughly corresponds to the state that is also in 2 is shown. In 3 it can be seen that the display area 511 is designed as a pointed projection on the pointer 51 . In the illustrated state, the display area 511 points to the left-hand part of the scale 41, which is formed by lines spaced apart in units of inches. In the state shown, the filling height EH can be read off directly in units of inches or inches. The pointer 51 is adjustable in its orientation relative to the other areas of the measuring element 5 . In this way, the display area 511 can also be rotated to the right so that it points to the left part of the scale 41, which has lines that are spaced apart from one another in the unit of millimeters. A correspondingly twisted pointer 51 then shows the filling height EH in the unit millimeters with its display area. Alternatively, the pointer 51 can also be rigid in its orientation about an axis of rotation perpendicular to the scale 41 and have two display areas 511 lying horizontally opposite one another. In this alternative embodiment, the filling height EH can be read simultaneously in millimeters and in inches. In the scale 41 there is an opening 411, which is designed here as a long hole, the longer extension of which is oriented vertically. The probe 52 and the operating portion 53 are arranged behind the scale 41, while the pointer 51 is arranged in front of the scale 41. The pointer 51 is connected to the operation portion 53 through the opening 411 by a connector. The position of the pointer 51 relative to the operating area 53 and thus also to the probe 52 is designed to be adjustable in the vertical direction. Such an adjustability enables the calibration of the probe 52 with respect to the scale 41. A slot 531 is introduced in the operating area, in which the pointer 51 is fastened in an adjustable manner. For calibration, the fastening of the pointer 51 in the slot 531 is released and the measuring element 5 is pushed into the scale element 4 in such a way that the tip of the probe 52 pointing downwards is flush with the underside 21 of the housing. In this state, the pointer is then moved along the elongated hole 531 relative to the operating area 53 until the display area 511 on the scale 41 indicates zero or another desired reference value. In this state, the pointer 51 is then fixed in the slot. The attachment of the pointer 51 in the slot 531 can take place, for example, using a screw connection. In the illustrated embodiment, the operating area 53 and the probe 52 are made in one piece. In order to facilitate replacement of the probe 52, however, the probe 52 and the operating area 53 can also be formed by different components which are connected to one another. The scale 41 has a scale area adjacent to the pointer 51 which is provided for determining the filling height EH by the measuring element 5 . Outside of this scale range, two further scale ranges with longer, horizontally oriented lines can be seen to the left and right of the measuring element 5 . These outer scale ranges are used to determine the fiber height FH, which, as previously described, is measured by the optical superimposition of the fibers FA standing in the housing from below with precisely these scale ranges. As an alternative to the illustrated embodiment, a function reversal between the measuring element 5 and the scale 41 can be made. With such a function reversal, a scale is arranged on the measuring element 5, whereas a pointer with a display area is arranged on the scale element. During the measurement, the scale arranged on the measuring element 5 then moves relative to a stationary pointer, which is arranged on the scale element 4 .

The invention is not limited to one of the embodiments described above, but can be modified in many ways.

All of the features and advantages resulting from the claims, the description and the drawing, including structural details, spatial arrangements and method steps, can be essential to the invention both on their own and in a wide variety of combinations.

Reference List

1

measuring device

2

Housing

21

case bottom

211

opening

22

case top

23

Side wall

24

connecting rod

3

reflection element

31

reflection surface

32

carrier

321

carrying range

322

mounting area

323

grip area

4

scale element

41

scale

411

mounting hole

42

carrying range

44

mounting area

5

measuring element

51

pointer

511

display area

52

probe

53

operating area

531

Long hole

N1

normal vector

N2

normal vector

FA

fiber

FH

fiber height

f

filling material

eh

filling level

KG

artificial grass ground

P1

first viewing position

p2

second viewing position

a

angle

Claims (34)

Measuring device (1) for measuring at least one parameter of an artificial turf comprising - a housing (2) which is designed to be open at least in some areas on at least one underside (21) of the housing, - at least one scale element (4) which has at least one scale (41), - at least one measuring element (5), which is relative to the housing (2) in a direction which is oriented essentially perpendicularly to the underside (21) of the housing, is movably arranged and which has at least one pointer (51), and wherein the measuring element (5) has a probe (52) which can be moved beyond the underside (21) of the housing, and the pointer (51) cooperates with the scale (41) to indicate the probe (52) projecting beyond the housing bottom (21). Measuring device (1) according to claim 1 , characterized in that the scale element (4) is oriented substantially parallel or at right angles to the underside (21) of the housing. Measuring device (1) according to one of the preceding claims, characterized in that the measuring device (1) comprises at least one reflection element (3) which is arranged on a different area of the housing (2) than the housing underside (21) and which reflects at least one light Has a reflective surface (31), the reflective surface (31) being positioned at an acute angle (α) relative to the underside (21) of the housing, such that an observer looking from above over the reflective surface (31) can determine the position of the pointer on the scale (41 ) recognizes. Measuring device (1) according to claim 3 , characterized in that in the housing bottom (21) between the reflection element (3) and the scale element (4) an opening (211) is arranged, which is provided for this purpose in use If necessary, take up synthetic turf fibers, which are then located in the optical path between the reflection element (3) and the scale element (4). Measuring device (1) according to one of the preceding claims, characterized in that the scale element (4) has a movable scale part, optionally with its own scale, which is intended to be placed on the filling material when in use. Measuring device (1) according to one of claims 3 until 5 , characterized in that the angle (α) is essentially 45° relative to the housing underside (21) or the angular position of the angle (α) of the reflection surface (31) is adjustable. Measuring device (1) according to one of the preceding claims, characterized in that the underside (21) of the housing is planar. Measuring device (1) according to one of the preceding claims, characterized in that the housing (2) is designed to be open at least in regions on the housing upper side (22) opposite the housing underside (21). Measuring device (1) according to one of claims 3 until 8th , characterized in that the reflection element (3) and the scale element (4) each form areas of the housing (2). Measuring device (1) according to one of claims 3 until 9 , characterized in that the housing (2) has at least one side wall (23), a frame or at least one connecting rod (24) which connects the reflection element (3) to the scale element (4). Measuring device (1) according to one of the preceding claims, characterized in that the elements of the housing (2), in particular the scale element (4) and the side wall (23), are designed to be thin-walled, the thickness of the elements of the housing (2) being at least is a factor of 10 smaller than the length and width of these elements. Measuring device (1) according to one of the preceding claims, characterized in that the elements of the housing (2), in particular the scale element (4) and the side wall (23), are made of a material with a constant thickness, in particular sheet metal or plastic. Measuring device (1) according to one of the preceding claims, characterized in that the housing (2) has a rectangular shape in a plan view perpendicular to the underside (21) of the housing. Measuring device (1) according to one of the preceding claims, characterized in that the scale element (4) and the side wall (23) and/or the reflection element (3) and the side wall (23) are connected by at least one connecting element, in particular a screw connection, preferably without tools , are connected to each other. Measuring device (1) according to one of claims 3 until 14 , characterized in that two side walls (23) are provided, which are respectively connected to the scale element (4) and the reflection element (3), the side walls (23), the scale element (4) and the reflection element (3) together forming a Form lateral surface, which encloses the housing bottom (21), which is open at least in certain areas. Measuring device (1) according to one of claims 3 until 15 , characterized in that at least a portion of the open housing bottom (21) is arranged between the reflection element (3) and the scale (41). Measuring device (1) according to one of the preceding claims, characterized in that the scale (41) is arranged essentially at right angles relative to the underside (21) of the housing. Measuring device (1) according to one of claims 3 until 17 , characterized in that the reflection element (3) has a carrier (32) on which the reflection surface (31) is fixed and which carries the reflection surface (31). Measuring device (1) according to one of claims 3 until 18 , characterized in that the reflection surface (31) is formed by a mirror. Measuring device (1) according to one of claims 3 until 19 , characterized in that the carrier (32) has a support area (321) carrying the reflective surface (31) and an attachment area (322) adjoining it, the attachment area (322) being arranged at an angle to the support area (321). Measuring device (1) according to one of claims 3 until 20 , characterized in that the carrier (32) has a grip area (323) which is provided for holding and positioning the measuring device (1), in particular the grip area (323) being designed as a recess in the carrier (32). Measuring device (1) according to one of claims 3 until 21 , characterized in that the reflective surface (31) is planar and the normal vector (N1) on the reflective surface (31) is oriented at an angle (α) to the normal vector (N2) on the planar scale (41). Measuring device (1) according to one of the preceding claims, characterized in that the scale (41) is formed by lines applied to the scale element (4) or formed into the scale element (4), which are parallel to one another at regular intervals and are measured in millimeters and / or are arranged in inches and the scale (41) includes an inscription with numerical values. Measuring device (1) according to one of the preceding claims, characterized in that the scale element (4) has a carrying area (42) which carries the scale (41) and the scale element (4) also has a fastening area (44) which is attached to the Carrying area (42) adjacent and which is arranged at an angle to the carrying area (42). Measuring device (1) according to one of the preceding claims, characterized in that the front region of the probe (52) of the measuring element (5), viewed in a direction away from the pointer (51), is tapered or tapered. Measuring device (1) according to one of the preceding claims, characterized in that the display area (511) is designed as a projection on or a recess in the pointer (51). Measuring device (1) according to one of the preceding claims, characterized in that the pointer (51) is designed to be adjustable in its orientation relative to the other areas of the measuring element (5). Measuring device (1) according to one of the preceding claims, characterized in that the measuring element (5) has an operating area (53) which projects in relation to the scale element (4) and/or the housing (2) and the operating area (53) is provided for this purpose move the probe (52). Measuring device (1) according to one of the preceding claims, characterized in that the measuring element (5) with the probe (52) can be moved against the restoring force of a spring. Measuring device (1) according to one of the preceding claims, characterized in that the operating area (53) is arranged on the side of the pointer (51) opposite the probe (52). Measuring device (1) according to one of the preceding claims, characterized in that the operating area (53) penetrates the scale element (4), in particular its fastening area (44). Measuring device (1) according to one of the preceding claims, characterized in that the scale element (4) has a linear bearing for the measuring element (5), this linear bearing allowing a movement of the measuring element (5) in a direction essentially perpendicular to the underside (21) of the housing. leads. Measuring device (1) according to one of the preceding claims, characterized in that the pointer (51) is designed to be adjustable in its position relative to the probe (52). Measuring device (1) according to one of the preceding claims, characterized in that the measuring device (1) is designed as an artificial turf measuring device, in particular as an infill height measuring device, as a fiber height measuring device, or as a combined infill height and fiber height measuring device.

Images