Indicator unit

Abstract

The invention relates to an indicator unit, a locking system with an indicator unit, a transport unit with two locking systems and the use of an indicator unit in a stroller, wherein the indicator unit is provided for indicating a locked state or at least an unlocked state, comprising a reference unit, a first indicator element and a second indicator element, wherein the first indicator element and the second indicator element are guided in or on the reference unit along an insertion axis or a transverse axis, preferably orthogonal to the insertion axis, displaceably relative to the reference unit and relative to each other, and are secured against displacement transversely to the respective insertion or transverse axis, wherein a first display section and a second display section are formed on the first indicator element, wherein a third display section is formed on the second indicator element,wherein the reference unit has an opening through which one of the display sections is visible to indicate either the locked state or the unlocked state, the locked state being indicated when the second display section is visible through the opening.

Description

[0001] The invention relates generally to a locking indicator for child transport vehicles, in particular to seat frames and baby car seats that are locked to the chassis.

[0002] Strollers or similar vehicles for children usually consist of a chassis with wheels and one or more units for transporting a child (e.g., seat frame and infant car seat). The chassis and the individual units are usually removable to make folding the stroller easier. This requires these units to be securely and intuitively secured by the user operating the units. The locking mechanism is usually self-locking, with elastic elements such as springs often being used to force the locking mechanism into a default state in which it is locked. A problem in this context is that an accurate and fail-safe indication of the locking state is not always guaranteed. It is particularly critical if the user is shown a locked state even though there is actually no mechanical locking.

[0003] The publications US 2015 / 0 191 108 A1 and DE 11 2023 001 253 T5 show details of display arrangements for a stroller with which a locking state is displayed to a user.

[0004] The object of the present invention is to provide an indicator which reliably indicates a locked state only when a mechanical lock actually exists.

[0005] The present invention solves this problem with an indicator unit according to claim 1, a locking system according to claim 12, a transport unit according to claim 14 and with the use of an indicator unit according to claim 15.

[0006] According to the invention, an indicator unit is provided for indicating a locked state or at least an unlocked state, comprising a reference unit, a first indicator element, and a second indicator element, wherein the first indicator element and the second indicator element are guided in or on the reference unit along an insertion axis or a transverse axis, preferably orthogonal to the insertion axis, so as to be displaceable relative to the reference unit and relative to one another, and are secured against displacement transversely to the respective insertion or transverse axis, wherein a first display section and a second display section are formed on the first indicator element, wherein a third display section is formed on the second indicator element, wherein the reference unit has an opening through which one of the display sections is visible in order to indicate either the locked state or the unlocked state,wherein the locked state is displayed when the second display section is visible through the opening. In other words, the indicator unit is particularly designed to provide a user with information as to whether a first component or assembly is properly and securely attached to a component or assembly. For this purpose, the indicator unit is particularly designed to take into account various variants of an insecure attachment of the first assembly to the second assembly and, in each case, to display an open or unlocked state. In particular, the indicator unit takes into account whether the first assembly is properly inserted into the second assembly along an insertion axis by monitoring precisely this insertion state with the second indicator element. Furthermore, the indicator unit provides information as towhether the first assembly is properly locked to the second assembly and thus secured, in particular, against displacement longitudinally and / or parallel to the insertion axis. For this purpose, the indicator unit has a reference unit, which in particular provides a reference geometry in the form of an opening. The reference unit is advantageously the housing or a portion of a housing of a locking system with which the first assembly can be secured to the second assembly. A first indicator element and a second indicator element are provided, movable relative to the reference unit, wherein the first indicator element has a first and a second display portion, and the second indicator element has a third display portion. Preferably, the second indicator element is arranged such that, in a specific position, it partially covers the first indicator element.wherein, particularly preferably, the third display section of the second indicator element is arranged along a line of sight through the opening of the reference unit in front of the first or second display section of the first indicator element, thus covering the latter in each case. In this way, various states of the locking system can be displayed by the respective position of the first and second indicator elements and made immediately apparent to a user of the indicator unit through the opening of the reference unit. This increases safety in a particularly simple manner during operation of a corresponding system, which is designed in particular as a child transport system or stroller and places correspondingly high demands on functional reliability and the secure fastening of individual components of this child transport system. The insertion axis and the transverse axis,The first indicator element and / or the second indicator element are preferably guided along the respective axis or secured against displacement transversely to the respective axis, and are advantageously arranged transversely to one another and, in a particularly simplified embodiment, perpendicular to one another. An angular range of 75-105°, which spans the intersection area of ​​the axes, is considered to be essentially transverse to one another.

[0007] In one embodiment, the opening defines a line of sight which is substantially orthogonal to a plane spanned by the edge of the opening, wherein at least one of the display sections is arranged such that it is intersected by the line of sight, preferably intersected centrally. The line of sight defines in particular the unobstructed view through the opening in the reference unit and is preferably defined as orthogonal to a plane which intersects the edge of the opening. In the event that the opening is provided in a curved region of the reference unit, the line of sight advantageously runs coaxially to the center line of the opening, which is advantageously designed as a bore. Therefore, if the opening is a cylindrical recess in the material of the reference unit, the line of sight runs coaxially to the cylinder axis.If a non-cylindrical and, in particular, polygonal opening is provided, the line of sight runs coaxially with the cylinder axis of a central, imaginary cylinder that approximates the internal geometry of the opening. Within the scope of the present invention, it is assumed that if the line of sight intersects the respective display section essentially in the middle, it is best visible through the opening. Furthermore, this feature prevents intermediate states between two display sections from being displayed, whereby the user of the system can always be provided with clear information regarding the locking or a locking that is not yet fully present.

[0008] In one embodiment, the locked state is indicated when the second display section and neither of the first nor the third display section is intersected by the line of sight. The locked state, i.e. the state in which a first assembly is fully and securely engaged with a second assembly, is indicated by the indicator unit in particular in that only the second display section of the first indicator element is visible through the opening and is not covered by the third display section. In this way, the user can be sure that the respective fastening geometry of the first assembly has been fully inserted into the corresponding fastening geometry of the second assembly and that this state is positively locked by a locking section.

[0009] In one embodiment, the reference unit is designed as a housing and has a first housing half and preferably a second housing half, wherein the opening is formed on the first housing half. Advantageously, the reference unit itself is designed as a housing and has a first housing half and a second housing half, wherein the first housing half is preferably arranged on the outside of the assembly and thus a user can determine the respective state of the indicator unit through the opening provided on the first housing half. The functional integration of the indicator unit into the housing, preferably the housing of a locking system, ensures particularly simple manufacture of the overall system and reduces the costs of providing an indicator unit according to the present invention.

[0010] In one embodiment, the first indicator element is arranged on the reference unit so as to be displaceable along the transverse axis, wherein a locking section having an undercut acting perpendicular to the transverse axis is formed on the first indicator element or is mechanically coupled to the first indicator element such that a displacement of the locking section causes a displacement of the first indicator element parallel to the transverse axis. The first indicator element is preferably mechanically connected to or formed directly together with a locking section, wherein the locking section has an undercut acting perpendicular to the transverse axis and thus advantageously parallel to the insertion axis.In a first position relative to the transverse axis, the locking portion is designed to engage with a retaining geometry of a second assembly. This position of the locking portion simultaneously effects a positioning of the first indicator element relative to the reference unit, and in this position of the locking portion, the second display portion of the first indicator element is visible through the opening. In a position of the locking portion relative to the transverse axis that deviates from the locked position, the first display portion is thus visible through the opening, and an unlocked state, i.e., an unsafe state, is indicated to the user.

[0011] In one embodiment, the first and second indicator sections are arranged on the side of the first indicator element facing away from the locking section, wherein the locking section has an entry region parallel to the transverse axis adjacent to the undercut, which entry region is open in the insertion direction, wherein the first indicator section is arranged on the side next to the second indicator section on which the entry region is also arranged next to the undercut. In order to provide the correct arrangement of the indicator sections on the first indicator element, they are therefore arranged in the same order with respect to the transverse axis as the entry region and the undercut on the locking section. The entry region is arranged on the same side as the first indicator section and the undercut is thus arranged on the same side with respect to the transverse axis as the second indicator section.

[0012] In one embodiment, the first display section and the third display section have a warning color, with the second display section having a confirmation color, preferably green. The warning color, i.e., the color used by the first and third display sections, is particularly red or orange, which commonly signals a warning to the user about an unsecured state. In the present context, a green or blue tone is used as the confirmation color, which respectively signals proper locking and a functional state of the vehicle.

[0013] In one embodiment, the second indicator element is arranged in a guided manner on the first indicator element and / or on the reference unit and is secured against displacement transversely to the insertion axis or transversely to the transverse axis, wherein the second indicator element has an actuating section which is arranged and designed to absorb a displacement force parallel to the insertion direction or parallel to the transverse direction on the second indicator element, wherein in a first position of the second indicator element the third display section is intersected by the line of sight and in a second position of the second indicator element a recess provided on the second indicator element is intersected by the line of sight.The second indicator element is thus advantageously not directly mechanically connected to the locking section, but can move along the insertion axis and / or along the transverse axis relative to the first indicator element and relative to the reference unit, and is secured and guided against displacement in the other directions. The second indicator element has an actuating section designed to absorb a corresponding displacement force other than the indicator element, wherein this displacement force is caused in particular by the correct insertion of the corresponding fastening section of the first assembly into a corresponding receiving section of the second assembly, as described above. In this way, the second indicator element provides information on the insertion state.If the second indicator element is not yet fully inserted into the corresponding fastening and receiving geometry, the second indicator element is preferably in a first position in which the third display section is intersected by the line of sight of the reference unit. Only after the fastening geometry of the first assembly has been fully inserted into the receiving geometry of the second assembly is the second indicator element preferably arranged in a second position in which a preferably provided recess in the second indicator element is intersected by the line of sight, thus allowing a clear view of the respective display section of the first indicator element.The locking section is advantageously preloaded with a force in the direction of the insertion area, so that upon insertion and overcoming this preload of the locking section, engagement is automatically achieved between a corresponding retaining geometry on the second assembly and the undercut of the locking section. Advantageously, the indicator element is thus also preloaded in a position in which the second indicator section is intersected by the line of sight.

[0014] In one embodiment, the actuating section is designed as a recess with a transformation geometry that is in positive engagement with an actuating element. A displacement of the actuating element parallel to the insertion axis, due to the positive engagement with the transformation geometry, causes a displacement of the second indicator element parallel to the transverse axis. In this embodiment, a further actuating element is provided that is displaceable relative to the first and second indicator elements as well as to the reference unit. This actuating element performs a displacement movement parallel to the insertion axis to transmit the corresponding insertion state to the second indicator element.The second indicator element has a transformation geometry, in particular a recess, which is in corresponding positive engagement with an actuating geometry of the actuating element, which converts a displacement of the actuating element into a displacement of the second indicator element parallel to the transverse axis.

[0015] In an alternative embodiment, the actuating portion is formed as a projection on the distal end of the second indicator element opposite the third display portion and is designed to absorb a force along the insertion axis, with the recess being arranged between the third display portion and the actuating portion. In this simplified embodiment, the second indicator element is directly subjected to the corresponding displacement force and preferably displaces parallel to the insertion axis, requiring fewer components in the indicator unit.

[0016] In one embodiment, a first unlocked state is indicated when the second indicator section and the third indicator section are intersected by the line of sight, the third indicator section obscuring the second indicator section, a second unlocked state is indicated when the first indicator section and the third indicator section are intersected by the line of sight, and a third unlocked state is indicated when the first indicator section and neither of the second nor the third indicator section is intersected by the line of sight. The arrangement of the first indicator element and the second indicator element relative to one another and relative to the opening of the reference unit thus allows a plurality of different unlocked states to be indicated.A first unlocked state is characterized in that the fastening geometry of the first assembly is not yet correctly inserted into the receiving geometry of the second assembly, but at the same time the locking section is already in its locking position. To avoid any misunderstanding of this arrangement of the locking section and to make it clear that the assemblies are not yet locked to one another, the indicator unit indicates an unlocked state, since the third display section, which is provided with a warning color, is visible through the opening. A second unlocked state is characterized in that the insertion is neither complete nor is the locking section in its locked position.This state could, for example, be triggered by jamming of the engagement geometry between the first assembly and the second assembly, in which there is no complete locking, and the assemblies are nevertheless more or less fixed to one another due to a jammed state. In this second unlocked state, the third display section is visible through the opening, but also covers the first display section at least in part, so that overall a warning color is visible through the opening. A third unlocked state occurs when the fastening area of ​​the first assembly is fully pushed into the receiving area of ​​the second assembly, but, possibly due to temporary jamming, the locking section is not yet fully engaged with the corresponding holding geometry of the second assembly.In this position, the third display section is not cut off from the line of sight, but the first display section, which also has a warning color, is visible through the opening.

[0017] According to the invention, a locking system is further provided, comprising a mobile unit and a frame unit, wherein the mobile unit has an indicator unit with the features described above, wherein the frame unit has a receiving geometry for receiving and guiding an engagement part of the mobile unit along the insertion axis, wherein the frame unit has a holding section which is designed for positive engagement with the locking section of the indicator unit and is provided to secure the mobile unit against displacement along the insertion axis relative to the frame unit, wherein the indicator unit only indicates the locking state when the engagement part is fully inserted into the receiving geometry and the locking section is in positive engagement with the holding section. In addition to the indicator unit, the locking system comprises subcomponents of a mobile unit and a frame unit.The mobile unit is preferably attached to a transport device or a transport unit which is removable from a frame. The frame unit is advantageously the corresponding receptacle or fastening geometry which is provided on a frame, for example the frame of a stroller. The frame unit has a receptacle geometry which is designed in particular as a receptacle recess. Within the receptacle geometry there is advantageously formed a holding section which is made of a resistant material such as hard plastic or metal and in particular allows a positive fastening by a positive engagement with the locking section. The mobile unit has an engagement part which is designed in particular for insertion into the receptacle geometry. Receptacle geometry and engagement part are advantageously to be understood as a plug and plug receptacle.The holding section of the frame unit is preferably designed as a cylindrical bolt or pin which is particularly designed to engage with a gap-shaped undercut on the locking section.

[0018] In one embodiment, the mobile unit has a handle coupled to the locking portion such that displacement of the handle by a user causes displacement of the locking portion and the first indicator element. The handle is particularly provided for releasing the connection between the frame unit and the mobile unit. Actuation of the handle preferably displaces the locking portion, which is pretensioned in the direction of its positive engagement, into its released position, thereby releasing the positive engagement between the locking portion and the holding portion of the frame unit. The handle is thus preferably mechanically coupled to the first indicator element and the locking portion.In an alternative embodiment, the mechanical preload of the locking portion into its locked position can also be achieved by a preload of the handle, which is indirectly transmitted to the locking portion through the mechanical coupling of the handle to the locking portion.

[0019] Furthermore, the invention provides a transport unit, in particular for use in a stroller, comprising two locking systems spaced apart from one another with the features described above, wherein a base section for forming or defining a transport area is provided between the locking systems. In a first preferred embodiment, the transport unit is designed as a baby seat of a stroller. In an alternative, likewise preferred embodiment, the transport unit is a child seat, in particular a foldable sports seat of a stroller. A locking system, which has an indicator unit, is arranged on each side of the transport unit. In a particularly preferred embodiment, a central handle can be provided which actuates both locking systems. Alternatively, two handles are provided, one on each of the locking systems.

[0020] Finally, the invention provides for the use of an indicator unit in a transport unit of a stroller. The use of the indicator unit according to the present invention in a stroller is particularly advantageous because particularly high safety requirements are placed on strollers, and the indicator unit offers particularly high utility in this technical field of application. At the same time, the indicator unit solves the problem of requiring the use of as few complex systems as possible on strollers that enable a fail-safe display of a corresponding locking status. This reduces the susceptibility to errors, and it also reduces the costs of manufacturing a transport unit of a stroller with a corresponding indicator unit.

[0021] Further advantages and characteristic features of the present invention will become apparent from the following description with reference to the accompanying figures. Identical features are used with the same reference numerals in the figures, even if they are part of different embodiments. It is understood that individual features explicitly described only for a specific embodiment may also be used in other embodiments of the invention, unless this is prohibited by technical circumstances.

[0022] They show: Fig. 1 a perspective view of an embodiment of a part of a transport unit; Fig. 2 a detailed view of the side area of ​​the transport unit according to Fig. 1; Fig. 3 is an exploded view of a first preferred embodiment of an indicator unit; Fig. 4 to 6 are perspective views of the corresponding interior of the first preferred embodiment of an indicator unit in different states; Fig. 7 is an exploded view of a second preferred embodiment of an indicator unit; and Fig. 8 to 11 views of the corresponding interior of the second embodiment of the indicator unit in different states.

[0023] The Fig. The transport unit 20 shown in Figure 1 is, in a preferred embodiment, the lower part of a baby seat of a stroller and has a base section 20A, on each side of which a locking system 10 is arranged. The mobile unit 12 of the locking system 10 is fixed to the base section 20A and is provided for engagement in a respective frame unit 14. The frame unit 14 is advantageously a receiving geometry fixed to the frame of the stroller, which allows for a positive reception and locking of the mobile unit 12.

[0024] As in Fig. 2, the mobile unit 12 is preferably inserted into the frame unit 14 along the insertion direction E and, in the fully inserted position, is positively secured against displacement along the insertion axis E by means of a locking portion 5 not shown in this figure. The reference geometry 2 provided on the mobile unit 12 has an opening 22 through which the locking state V or unlocked state O can be read.

[0025] Fig. 3 shows an exploded view of the already Fig. 2 shown embodiment of the indicator unit 1, which preferably is part of the mobile unit 12 according to Fig. 2. The indicator unit has a reference unit 2, which in the present example is part of a housing and has a first housing half 24, wherein an opening 22 is provided in the reference unit 2, which defines a line of sight S. A first indicator element 3, a second indicator element 4, and an actuating element 4A are provided within the reference unit 2. The first indicator element 3 has a first display section 31 and, adjacent to it and parallel to the transverse axis Q, a second display section 32. Formed integrally on the first indicator element 3 is a locking section 5 with an undercut 52 and an entry area 54. The first display section 31 is preferably arranged on the same side next to the second display section 32 as the entry area 54 next to the undercut 52.The second indicator element 4 has an actuating section 41, which is designed as a transformation geometry 42. The transformation geometry 42 is designed and provided for engagement with the cylindrical projection formed on the actuating element 4A and converts a displacement of the actuating element 4A parallel to the insertion direction E into a displacement movement of the second indicator element 4 parallel to the transverse direction Q. The actuating element 4A is preferably equipped on its underside with two support sections, which are designed to be supported on the receiving geometry 15 of the frame unit 14. In this way, when the mobile unit 12 is inserted into the frame unit 14, the actuating element 4A is displaced upwards relative to the reference unit 2, parallel to the insertion axis E, which in turn causes a displacement movement of the second indicator element 4 parallel to the transverse direction. In the preferred embodiment according to . Fig. 3, the second indicator element 4 is displaced to the left, whereby, instead of the third display section 43, the recessed area arranged to the right of the third display section 43 is now cut off from the line of sight S. In this way, after the mobile unit 12 has been fully inserted into the frame unit 14, the view of one of the display sections 31, 32 of the first indicator element 3 is released.

[0026] Fig. 4 shows a first unlocked state O1 of the embodiment of the indicator unit 1 according to Fig. 3, wherein the mobile unit 12 is not inserted into the frame unit 14 and, accordingly, only the third display section 43 is visible in the opening 22. Since the locking section 5 is in its locked position, the second display section 32 is arranged behind the third display section 43, but is concealed by the third display section 43.

[0027] Fig. 5 shows the third unlocked state O3 of the indicator unit 1, wherein the mobile unit 12 is fully inserted into the frame unit 14, but the locking section 5 is not in its locked position, but rather shifted to the left in its unlocked position. The second indicator element 4 is shifted to the left due to the complete insertion into the frame unit 14, and the view of the first display section 31 is not obscured by the third display section 43. Nevertheless, the indicator unit indicates an unlocked state, since the first display section 31, which is colored red, is visible through the opening 22. In this state, the mobile unit 12 could thus be pulled out of the frame unit 14 again without resistance, which could potentially pose a danger.

[0028] Fig. 6 finally shows the locked state V of the indicator unit 1, in which both the complete insertion of the mobile unit 12 into the frame unit 14 is present and the locking by the engagement of the undercut 52 with the holding section 16. Accordingly, the second display section 32 of the first indicator element 3 is visible through the opening 22 and the user is shown the securely locked state of the system.

[0029] Fig. 7 shows a further preferred embodiment of an indicator unit 1 in an exploded view. This embodiment of the indicator unit 1 is particularly suitable for use on a sports seat of a stroller. The reference unit 2 is preferably part of a housing with a first housing half 24 and a second housing half 26. The opening 22 is provided in the first housing half 24 and defines a line of sight S along the cylinder axis of the cylindrical recess which forms the opening 22. The indicator unit 1 according to this embodiment is part of a mobile unit 12 and in turn has a first indicator element 3 and a second indicator element 4, wherein the arrangement of the display sections 31, 32 and 43 as well as the display recess 44 are shown in the detailed view.In this embodiment, an actuating element 4A according to the previously described embodiment is omitted, and the second indicator element 4 performs a vertical movement parallel to the engagement axis E, wherein the viewing axis S intersects either the third display section 43 or the display recess 44. Furthermore, this embodiment of the mobile unit 12 has, in addition to the indicator unit 1, a handle 17 which is mechanically coupled to the first indicator element 3 such that a displacement of the handle 17 causes the first indicator element 3, with the locking section 5 preferably formed thereon, to be displaced parallel to the transverse axis, whereby the locking section 5 moves into its unlocked position.

[0030] Fig. Figure 8 shows a first unlocked state O1 of the indicator unit 1, wherein the mobile unit 12 is arranged outside the frame unit 14 and the locking section 5 is in its locked position. In this state, only the third display section 43 is visible through the opening 22.

[0031] Fig. 9 shows a second unlocked state O2, wherein, on the one hand, the mobile unit 12 is not fully inserted into the frame unit 14 and, on the other hand, the locking section 5 is in its unlocked position, i.e., is arranged offset to the left in the figure. In this second unlocked state O2, which can occur in particular during the insertion process of the mobile unit 12 into the frame unit 14, the third display section 43 is also visible through the opening 22, wherein in this case, it covers the first display section 31.

[0032] Fig. 10 shows a third unlocked state O3, wherein the mobile unit 12 is fully inserted into the frame unit 14, but the locking portion 5 is not yet in complete positive engagement with the holding portion 16. In this unlocked state O3, the second indicator element 4 is displaced upwards along the insertion axis E, and the first indicator element 3 is visible through the display recess 44. However, since the locking portion 5, together with the first indicator element 3, is displaced to the left in the figure, the first display portion 31 is visible through the opening 22, which again signals an unlocked state with its warning color.

[0033] Fig.Finally, Figure 11 shows the locked state V of the second embodiment, in which the mobile unit 12 is, on the one hand, fully inserted into the frame unit 14 and, on the other hand, the locking portion 5 is arranged such that a positive engagement between the undercut 52 and the holding portion 16 prevents the mobile unit 12 from being pulled out of the frame unit 14. In this locked state V, only the second display portion 32 of the first indicator element 3 is visible through the opening. List of reference symbols: 1 indicator unit 2 Reference unit 3 first indicator element 4 second indicator element 4A Actuating element 5 Locking section 10 Locking system 12 mobile units 13 Intervention part 14 frame unit 15 Recording geometry 16 stopping section 17 Handle 20 transport units 20A basic section 22 Opening 24 first housing half 26 second housing half 31 first display section 32 second display section 41 Operating section 42 Transformation geometry 43 third display section 44 Display recess 52 undercut 54 Entrance area E Insertion axis O unlocked state O1 first unlocked state O2 second unlocked state O3 third unlocked state Q transverse axis S line of sight V Locking state

Claims

[1] Indicator unit (1) for indicating a locked state (V) or at least an unlocked state (O), comprising a reference unit (2), a first indicator element (3) and a second indicator element (4), wherein the first indicator element (3) and the second indicator element (4) are guided in or on the reference unit (2) along an insertion axis (E) or a transverse axis (Q) preferably orthogonal to the insertion axis (E) relative to the reference unit (2) and relative to each other, and are secured against displacement transversely to the respective insertion or transverse axis (E, Q), wherein a first display section (31) and a second display section (32) are formed on the first indicator element (3), wherein a third display section (43) is formed on the second indicator element (4), wherein the reference unit (2) has an opening (22) through which one of the display sections (31, 32, 43) is visible to indicate either the locked state (V) or the unlocked state (O), the locked state (V) being indicated when the second display section (32) is visible through the opening (22). [2] Indicator unit (1) according to claim 1, wherein the opening (22) defines a line of sight (S) which is substantially orthogonal to a plane spanned by the edge of the opening (22), wherein at least one of the display sections (31, 32, 43) is arranged such that it is intersected by the line of sight (S), preferably intersected centrally. [3] The indicator unit (1) according to claim 2, wherein the locked state (V) is displayed when the second display section (32) and none of the first and third display sections (31, 43) are intersected by the line of sight (S). [4] Indicator unit (1) according to one of the preceding claims, wherein the reference unit (2) is designed as a housing and has a first housing half (24) and preferably a second housing half (26), wherein the opening (22) is formed on the first housing half (24). [5] Indicator unit (1) according to one of the preceding claims, wherein the first indicator element (3) is arranged displaceably along the transverse axis (Q) on the reference unit (2), wherein a locking portion (5) having an undercut (52) acting perpendicular to the transverse axis (Q) is formed on the first indicator element (3) or is mechanically coupled to the first indicator element (3) in such a way that a displacement of the locking portion (5) causes a displacement of the first indicator element (3) parallel to the transverse axis (Q). [6] Indicator unit (1) according to claim 5, wherein the first and second display sections (31, 32) are arranged on the side of the first indicator element (3) facing away from the locking section (5), wherein the locking section (5) has an entry region (54) parallel to the transverse axis (Q) adjacent to the undercut (52) which is open in the insertion direction (E), wherein the first display section (31) is arranged on the side next to the second display section (32) on which the entry area (54) is also arranged next to the undercut (52). [7] Indicator unit according to one of the preceding claims, wherein the first display section (31) and the third display section (43) have a warning color and wherein the second display section (32) has a confirmation color, preferably green. [8] Indicator unit (1) according to one of claims 2 to 7, wherein the second indicator element (4) is arranged on the first indicator element (3) and / or on the reference unit (2) and is secured against displacement transversely to the insertion axis (E) or transversely to the transverse axis (Q), wherein the second indicator element (4) has an actuating section (41) which is arranged and designed to absorb a displacement force parallel to the insertion direction (E) or parallel to the transverse direction (Q) on the second indicator element (4), wherein in a first position of the second indicator element (4) the third display section (43) is intersected by the line of sight (S) and in a second position of the second indicator element (4) a recess (44) provided on the second indicator element (4) is intersected by the line of sight (S). [9] Indicator unit (1) according to claim 8, wherein the actuating section (41) is designed as a recess with a transformation geometry (42) which is in positive engagement with an actuating element (4A), wherein a displacement of the actuating element (4A) parallel to the insertion axis (E) causes a displacement of the second indicator element (4) parallel to the transverse axis (Q) due to the positive engagement with the transformation geometry (42). [10] Indicator unit (1) according to claim 8, wherein the actuating portion (41) is formed as a projection on the distal end of the second indicator element (4) opposite the third display portion (43) and is designed to absorb a force along the insertion axis (E), wherein the recess (44) is arranged between the third display section (43) and the actuating section (41). [11] Indicator unit (1) according to one of claims 2-10, wherein a first unlocked state (O1) is displayed when the second display section (32) and the third display section (43) are intersected by the line of sight (S), the third display section (43) obscuring the second display section (32), wherein a second unlocked state (O2) is displayed when the first display section (31) and the third display section (43) are intersected by the line of sight (S), wherein a third unlocked state (O3) is displayed when the first display section (31) and none of the second and third display sections (32, 43) are intersected by the line of sight (S). [12] Locking system (10) comprising a mobile unit (12) and a frame unit (14), wherein the mobile unit (12) comprises an indicator unit (1) according to one of the preceding claims, wherein the frame unit (14) has a receiving geometry (15) for receiving and guiding an engagement part (13) of the mobile unit (12) along the insertion axis (E), wherein the frame unit (14) has a holding section (16) which is designed and provided for positive engagement with the locking section (5) of the indicator unit (1) in order to secure the mobile unit (12) against displacement along the insertion axis (E) relative to the frame unit (14), wherein the indicator unit (1) only indicates the locking state (V) when the engagement part (13) is fully inserted into the receiving geometry (15) and the locking section (5) is in positive engagement with the holding section (16). [13] Locking system (10) according to claim 12, wherein the mobile unit (12) has a handle (17) which is coupled to the locking portion (5) such that a displacement of the handle (17) by a user causes a displacement of the locking portion (5) and the first indicator element (3). [14] Transport unit (20), in particular for use in a stroller, comprising two locking systems (10) spaced apart from one another according to one of claims 12 or 13, wherein a base section (20A) for forming or defining a transport area is provided between the locking systems (10). [15] Use of an indicator unit (1) according to one of claims 1-11 in a transport unit (20) of a stroller.

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