Convertible device for use as a child's exercise apparatus or a pram

Abstract

The invention relates to a convertible device for use as a child's exercise apparatus or a pram, a folding pram, a pushchair or a similar device, comprising a frame body part (10), at least two main wheels (13, 14) connected to the frame body part (10) by means of wheel axles (11, 12), and a support member (15) which can be arranged on the frame body part (10), wherein the wheel axle (11) of one main wheel (13) is connected to a steering column (16) which is rotatably connected to the frame body part (10), the wheel axle (12) of the other main wheel (14) is connected to the frame body part (10), and the device comprises at least two distance-adjustable side wheels (21, 31) which are spaced apart at a variable distance (T) on both sides of a longitudinal main plane (17) of the frame body part (10), each side wheel (21, 31) being rotatably connected to a respective side wheel member (20, 30) by means of a respective side axle (22, 32), the side wheel member (20, 30) being movably connected to the frame body part (10). The invention is characterized in that at least one respective slider body (40, 50) comprising a respective curved guide rail (41, 51) is arranged on the frame body part (10), and the at least one slider body (40, 50) is mirror-symmetrical with respect to the longitudinal main plane (17) of the frame body part (10) on both sides of the longitudinal main plane (17), the slider body (40, 50) comprising a sliding member (2, 3) which is configured in such a size and shape that it corresponds to the curved guide rail (41, 51) of the slider body (40, 50) and can move along the curved guide rail (41, 51) of the slider body (40, 50), the frame body part plane (43) comprising the centre line (42) of the curved guide rail (41) of one slider body (40) and the frame body part plane (53) comprising the centre line (52) of the curved guide rail (51) of the other slider body (50) are arranged mirror-symmetrically with respect to the longitudinal main plane (17) of the frame body part (10), and the curved movement path (2a, 3a) in the sliding member (2, 3) and the centre line (42, 52) of the guide rail (41, 51) of the slider body (40, 50) constitute mutually corresponding circular arcs.

Description

TECHNICAL FIELD

[0001] The invention relates to a convertible device for use as a child's sports apparatus or a pram, a folding pram, a pushchair or a similar device, comprising a frame body part, at least two main wheels connected to the frame body part by an axle, and a support member, which can be arranged on the frame body part, wherein the axle of one main wheel is connected to a steering column rotatably connected to the frame body part, the axle of the other main wheel is connected to the frame body part, and the device comprises at least two distance-adjustable side wheels spaced apart at a variable distance on both sides of the longitudinal main plane of the frame body part, each side wheel being rotatably connected to a respective side axle member by a respective side axle, the side axle member being movably connected to the frame body part. BACKGROUND

[0002] To solve the problem of transporting children of different ages, a large number of prams and prams with frame structures of different sizes and shapes have been developed so far. However, nowadays, prams and prams suitable for performing other functions are becoming more and more common. With only a slight modification, they can be used as a balance car, a child's tricycle or a child's bicycle. That is, they are not only suitable for transporting toddlers who cannot walk, but also for exercising the child's legs.

[0003] Such a solution is disclosed, inter alia, in document no. US2015 / 021877A1. The basic feature of this solution is that certain elements of the frame structure located in the part close to the rear wheels are connected to each other so that they can rotate around the axle, and the rear axle is replaceable. Thus, the same frame structure can be used to produce a two- or three-wheeled child's bicycle or pram.

[0004] However, the disadvantage of this technical solution is that the conversion from one embodiment to another can only be carried out with tools and requires a certain specific skill. Another disadvantage of this solution is that the conversion process is time-consuming and requires carrying the parts needed for the replacement operation. Therefore, it is difficult to carry out the conversion under street conditions.

[0005] The utility model CN204077941U and the document no. US2014 / 0103616A1 disclose a solution that can be converted from a pram to a tricycle of two types.

[0006] In the case of the former, the wheels and the seat can be moved relatively simply, so that the tricycle can be relatively easily converted into a pram suitable for carrying a child. However, the disadvantage is that both wheels arranged on the same axle are located on a steerable axle, which is not only difficult to steer, but also dangerous, and the pram cannot even be modified into a balance bicycle.

[0007] The latter solution has the disadvantages of being complex, requiring specific skills for conversion, being time-consuming, and being bulky, making the transportation of the additional components particularly cumbersome. Consequently, this solution does not allow, for example, parents of children who can already walk but still need to sit in the stroller from time to time to easily convert the stroller into, for example, a balance bike "on the spot."

[0008] The configuration of the present invention is intended to eliminate the disadvantages of known multi-purpose convertible strollers and to provide a convertible device that, in addition to its simple configuration, allows a conventional three-wheeled stroller to be manually converted (through a few simple movements) into a balance bike or tricycle without the use of any tools and any substantial effort, and without the need to add or remove any parts, thereby maintaining safe steering and maneuverability in both the stroller and balance bike or tricycle states.

[0009] The motivation for the configuration of the present invention is based on the following recognition, that is, in the case of implementation of certain components of the frame structure, curved (bending) members are applied, which are connected to other components of the frame structure at appropriate positions and in appropriate directions, and if such further sliding parts are fixed to these curved members, these curved members are suitable for being pulled out and reintroduced from the said curved members of the frame structure in a preferably symmetrical manner along a curved movement path, and wheels are also provided on these slidable members, then, by moving these sliding members inward and outward, the distance between the wheels provided on the sliding members can be simply changed, which means that the conversion of a stroller to a balance car can also be easily achieved, and thus the purpose of the present invention can be achieved. Summary of the Invention

[0010] According to the object of the present application, there is provided a convertible device for use as a child's exercise apparatus or a baby carriage, comprising a carriage body portion, at least two main wheels connected to the carriage body portion by wheel axles, and a support member which can be provided on the carriage body portion, wherein the wheel axle of one main wheel is connected to a steering column which is rotatably connected to the carriage body portion, the wheel axle of the other main wheel is connected to the carriage body portion, the device comprises at least two distance-adjustable side wheels which are spaced apart at variable distances on both sides of a longitudinal main plane of the carriage body portion, each side wheel is rotatably connected to a corresponding wheel-holding member by a corresponding side axle, and the wheel-holding member is movably connected to the carriage body portion, the device is further configured such that at least one corresponding slider body comprising a corresponding curved guide rail is provided on the carriage body portion and is mirror-symmetrically arranged with respect to the longitudinal main plane of the carriage body portion on both sides of the longitudinal main plane, the slider body comprises a sliding member which is configured in size and shape corresponding to the curved guide rail of the slider body and is movable along the curved guide rail of the slider body, a carriage plane comprising a center line of the curved guide rail of one slider body and a carriage plane comprising a center line of the curved guide rail of the other slider body are arranged mirror-symmetrically with respect to the longitudinal main plane of the carriage body portion, and a curved movement path of the sliding member and the center line of the guide rail of the slider body constitute mutually corresponding circular arcs.

[0011] Another feature of the convertible device of the present application can be that one sliding member is connected to one wheel-holding member and the other sliding member is connected to the other wheel-holding member, and each wheel-holding member is slidably engaged with the corresponding slider body by the sliding member.

[0012] In another variant embodiment of the convertible device, one wheel-holding member and one sliding member are formed by a single-piece member, and the other wheel-holding member and the other sliding member are also formed by a single-piece member.

[0013] In another embodiment of the present application, the wheel-holding members have corresponding center lines, and the center lines of the wheel-holding members are shaped identically to the center lines of the guide rails of the slider bodies, and the slider bodies are adapted to cooperate with the wheel-holding members.

[0014] In yet another embodiment of the convertible device, a straight line connecting the connection points between the side wheels of each wheel-holding member and the side axles cooperating with the side wheels is perpendicular to the longitudinal main plane of the carriage body portion.

[0015] In yet another structure of the present application, the connection points between the side wheels of each wheel-holding member and the side axles adapted to cooperate with the side wheels are arranged at at least a portion of the outer end positions of the wheel-holding members symmetrically with respect to the longitudinal main plane of the carriage body portion.

[0016] In a preferred configuration of the convertible device, the slider body and the holding wheel member are formed by a pipe section, and the slider member and the holding wheel member are telescopically and at least partially inserted into the pipe cavity of the tubular slider body.

[0017] In another variant embodiment of the present application, the convertible device further comprises a synchronization unit, wherein the synchronization unit comprises a rotating transmission shaft and transmission members fixed to the rotating transmission shaft, each transmission member being connected to a corresponding holding wheel member in a transmission motion.

[0018] In another configuration of the convertible device, the convertible device further comprises support members for connecting the driver's seat, wherein each support member comprises a connecting protrusion capable of fixing the driver's seat, and the other slider body comprising a respective curved guide rail is disposed on the vehicle body portion, the other slider body being mirror-symmetrically disposed relative to the longitudinal main plane of the vehicle body portion on both sides of the longitudinal main plane, each slider body being connected to a slider member corresponding in size and shape to the curved guide rail of the slider body and being movable along the curved guide rail of the slider body, the vehicle plane comprising the center line of the curved guide rail of one slider body and the vehicle plane comprising the center line of the curved guide rail of the other slider body are mirror-symmetrically disposed relative to the longitudinal main plane of the vehicle body portion, and the vehicle plane comprising the center line of the curved guide rail of one slider body and the vehicle plane comprising the center line of the curved guide rail of the other slider body form an acute angle with each other, the curved movement path of the slider member and the center line of the guide rail of the slider body form corresponding circular arcs, the end portion of one support member opposite to the other end portion holding the connecting protrusion is connected to one slider member, the end portion of the other support member opposite to the other end portion holding the connecting protrusion is connected to the other slider member, and each support member is slidably coupled to the corresponding slider body through the slider member.

[0019] In another variant embodiment of the present application, one support member and one slider member are formed by a single-piece component, and the other support member and the other slider member are formed by a single-piece component.

[0020] In a potentially preferred embodiment of the present application, the convertible device further comprises a synchronization unit, wherein the synchronization unit comprises a rotating transmission shaft and transmission members fixed to the rotating transmission shaft, each transmission member being connected to a corresponding support member in a transmission motion. Alternatively, the rotating transmission shaft of the synchronization unit further comprises transmission members, wherein a portion of the transmission members is connected to the holding wheel member in a transmission motion, and another portion of the transmission members is connected to the support member in a transmission motion.

[0021] In a potentially preferred embodiment of the present application, the slider body and the support member are formed by a pipe section, and the slider member and the support member are telescopically and at least partially inserted into the pipe cavity of the tubular slider body.

[0022] In another embodiment of the convertible device, the frame plane comprising the centre line of the curved guide of the slider body forms an inclination angle of less than 180° with the frame plane comprising the centre line of the curved guide of the other slider body.

[0023] The convertible device of the present invention has several advantageous features. Among the most important ones are - by means of the curved slider body arranged symmetrically to the longitudinal main plane of the frame body part; by means of the holding wheel member adapted to move along the curved guide between its two end parts; and by means of the support member - the convertible device can be quickly and easily converted from its two-wheeled balance bike state to its three-wheeled stroller state and vice versa, i.e. without the use of any tools or the installation of any additional parts.

[0024] Another advantageous feature is that the convertible device consists of a small number of parts, thus the failure rate of the convertible device is low and the maintenance requirements are minimal.

[0025] It should also be mentioned as an advantage that due to the small number of parts, the mass of the convertible device is relatively small, thus the convertible device can be handled and moved more easily compared to other devices.

[0026] It can also be considered as an advantage that in the case of a slider body made of a tube, the holding wheel member fitted into the slider body and inserted into the slider body in the balance bike state strengthens the rigidity and resistance of the frame body part, thus it can result in an increased safety of the sports appliance during the use of the child. BRIEF DESCRIPTION OF DRAWINGS

[0027] The convertible device of the present invention will be explained in detail in the exemplary embodiments below, with reference to the attached drawings, in which,

[0028] Figure 1 is a partial sectional side view of a possible variant of the convertible device, showing the device in the balance bike state,

[0029] Figure 2 is Figure 1 a top view of the convertible device in the balance bike state,

[0030] Figure 3 is Figure 1 a front view of the convertible device in the balance bike state,

[0031] Figure 4 is a partial sectional side view of a possible variant of the convertible device, showing the device in the stroller state,

[0032] Figure 5 is Figure 4 a top view of the convertible device in the stroller state,

[0033] Figure 6 is Figure 4 is a front view of the convertible device in the stroller mode. DETAILED DESCRIPTION

[0034] Figure 1 and Figure 2 An embodiment of the convertible device 1 in the balance bike mode of the present application is shown. As shown, the frame body portion 10 of the convertible device 1 includes a steering column 16 for fixing a wheel axle 11 for supporting a front main wheel 13 of the convertible device 1, and a handlebar 16a provided at an end of the steering column 16 opposite to the wheel axle 11. A wheel axle 12 for supporting a rear main wheel 14 and a seat 15 forming a part of the outer shell of the frame body portion 10 are also connected to the frame body portion 10.

[0035] As Figure 2 shown, the seat 15 is removed from the frame body portion 10 for the convenience of observation, and a slide body 40 for supporting a holding wheel member 20 provided with a side wheel 21, a slide body 50 for partially receiving a holding wheel member 30 provided with a side wheel 31, a slide body 60 for supporting a support member 80, and a slide body 70 for partially receiving a support member 90 are attached to the frame body portion 10. The side wheel 21 is coupled to the holding wheel member 20 through a side axle 22, and the side wheel 31 is coupled to the holding wheel member 30 through a side axle 32. At this time, it should be noted that the side wheel 21 and the holding wheel member 20, and the side axle 22 and the side axle 32 located between the side wheel 31 and the holding wheel member 30 can also be configured to enable the side axle 22 to rotate around the holding wheel member 20 in addition to enabling the side wheel 21 to rotate around the side axle 22. It is obvious that the above-mentioned relationship also applies to the relationship between the holding wheel member 30, the side wheel 31, and the side axle 32. In this case, the side wheel 21 and the side wheel 31 can be self-adjusted, thereby greatly improving the controllability of the convertible device 1 in the stroller mode and greatly improving the maneuverability thereof.

[0036] Of course, it is also conceivable that the side wheel 21 and the side wheel 31 can rotate around the side axle 22 of the holding wheel member 20 and the side axle 32 of the holding wheel member 30, respectively, but the side axle 22 and the side axle 32 cannot rotate around the holding wheel member 20 and the holding wheel member 30.

[0037] The slide bodies 40, 60 are provided on one side of a longitudinal main plane 17 of the frame body portion 10, and the slide bodies 50, 70 are provided on the other side of the longitudinal main plane 17 of the frame body portion 10 in such a way that the slide bodies 50, 40 and the slide bodies 60, 70 are provided symmetrically to each other with respect to the longitudinal main plane 17.

[0038] As Figure 1As shown, in this embodiment, the slider main body 50, which is firmly attached to the frame main body 10, is made of a rectangular side section pipe and has a curved structure, and the center line 52 thereof also has a circular arc shape. In addition, the curved guide rail 51 surrounding the pipe cavity 54 also has a curved shape. A portion of the holding wheel member 30 is located in the pipe cavity 54 of the slider main body 50, and the sliding member 3 is connected to the end portion on the other side of the end portion of the fixed side shaft 32 of the holding wheel member 30, which supports the side wheel 31. The sliding member 3 functions to enable the holding wheel member 30 to achieve simple displacement in the pipe cavity 54 of the slider main body 50.

[0039] In the case of the given embodiment, the sliding member 3 is a separate component combined with the holding wheel member 30. However, it should be noted that the sliding member 3 can also be formed by the holding wheel member 30. In this case, the holding wheel member 30 and the sliding member 3 are integrally formed (as a single-piece component).

[0040] In order to be able to easily pull the holding wheel member 30 out of the pipe cavity 54 of the slider main body 50 and reintroduce it, the center line 33 of the holding wheel member 30 is arranged to be aligned with and overlap the center line 52 of the slider main body 50. In addition, the movement path 3a of the sliding member 3 is also arranged to correspond to the curved guide rail 51 of the slider main body 50 and to be aligned with the center line 52 of the slider main body 50.

[0041] It should be noted that the slider main body 50 is not limited to being made of a rectangular side section pipe. The slider main body 50 can also be configured in different ways, for example, by applying a C-shaped side section with a longitudinal cut, or alternatively, by applying a circular side section pipe.

[0042] In Figure 1 It can also be well observed in the case that the slider main body 70 is also realized by a structural member made of a rectangular side section pipe. The center line 72 of the slider main body 70 also has a circular arc shape. Therefore, the slider main body 70, which has a pipe cavity 74, also has a curved shape. A portion of the support member 90 is located inside the pipe cavity 74 of the slider main body 70, and the sliding member 5 attached to the end portion 93 of the support member 90, which is opposite the end portion 92 thereof holding the connecting protrusion 91, is also located therein. The purpose of the connecting protrusion 91 is to connect the support member 80 and the support member 90 at the position determined by the connecting protrusion 81, and as will be described in detail below with reference to the detailed description of the Figure 4 to Figure 6 The convertible device 1 in the state of the stroller is facilitated to be controlled.

[0043] In this embodiment, the slide member 5 is a separate component attached to the other end portion 93 of the support member 90 for enabling the support member 90 to be easily slid into and out of the lumen 74 of the slide body 70. However, it should also be noted that the slide member 5 and the support member 90 can be formed as a single integral component. In this case, the end portion 93 of the support member 90 needs to be configured in such a way that the support member 90 can be easily moved.

[0044] The following also applies to the case of the slide body 70 and the support member 90 adapted to be moved therein: The center line 72 of the slide body 70 and the movement path 5a of the slide member 5 of the support member 90 can be aligned with and overlap each other, thereby forming one and the same circular arc.

[0045] It is necessary to mention once again that the slide body 70 is not limited to being made of a rectangular side cross-section tube. The slide body 70 can also be configured in different ways, for example, by applying a C-shaped side cross-section tube with a longitudinal cut, or alternatively, by applying a circular side cross-section tube.

[0046] In Figure 2 In the case of the slide body 40 and the holder member 20, the structure and the relative position thereof are substantially the same as in the case of the slide body 50 and the holder member 30. The slide body 40 is also formed by a bent tube, the center line 42 of which forms the same circular arc as the center line 52 of the slide body 50, and has a guide rail 41 which also has a curved structure. In this case, a part of the holder member 20 and the slide member 2 attached to the holder member 20, which is realized as a separate component, are also located in the lumen 44 of the slide body 40. However, the latter can of course also be formed from the material of the holder member 20. The center line 23 of the holder member 20 coincides with the center line 42 of the slide body 40, and the movement path 2a of the slide member 2 also lies on the same circular arc.

[0047] The above description also applies to the slider body 60 and the support member 80. The structure and the interconnection of these components are identical to those of the slider body 70 and the support member 90. The radius of curvature of the centre line 62 of the slider body 60 is identical to that of the centre line 72 of the slider body 70, and the guide rail 61 of the slider body 60 around the lumen 64 also has a curved shape. A substantial part of the support member 80 is located in the lumen 64, and substantially only the connecting protrusion 81 is located at the end portion 82 of the support member 80 which protrudes from the lumen 64. In this case, the sliding member 4 is provided as a separate structural component at the other end portion 83 of the support member 80 for enabling the support member 80 to be easily slid into and out of the lumen 64 of the slider body 60. However, the sliding member 4 can be formed as part of the other end portion 83 of the support member 80, i.e. integral with the support member 80. Also, the movement path 4a of the sliding member 4 is on and overlaps the centre line 62 of the slider body 60.

[0048] For the sake of understanding, in Figure 2 , the portion of the slider body 40 near the front wheel 14 is shown in cross-section, so that the position of the other end portion 83 of the support member 80 provided in the slider body 60 and of the sliding member 4 connected to said other end portion 83 can be observed.

[0049] In Figure 2 , it can also be observed that in this embodiment the synchronisation unit 6 is also provided on the frame body portion 10. The function of the synchronisation unit 6 is to provide positive coupling between the holding wheel member 20, the holding wheel member 30, the support member 80 and the support member 90. This is because in this case the slidable structural components are configured to protrude simultaneously from the slider bodies 40, 50, 60, 70 which are adapted to support them.

[0050] Reference is now made to Figure 3 , it can be observed in the drawings that the frame body portion plane 43 comprising the centre line 42 of the slider body 40 and the frame body portion plane 53 comprising the centre line 52 of the slider body 50 extend in a symmetrical manner with respect to the longitudinal main plane 17 of the frame body portion 10. In this case, the frame body portion plane 43 is at an inclination angle a to the frame body portion plane 53. In Figure 3 , the longitudinal main plane 17 also bisects the inclination angle a.

[0051] Furthermore, the frame body portion plane 63 comprising the centre line 62 of the slider body 60 and the frame body portion plane 73 comprising the centre line 72 of the slider body 70 extend in a symmetrical manner with respect to the longitudinal main plane 17 of the frame body portion 10, at an oblique angle b to each other. In Figure 3The longitudinal main plane 17 likewise bisects the oblique angle β in the plane of the drawing.

[0052] It can also be observed that the straight line E connecting the connection point Cl of the side wheel 21 and the side axle 22 with the connection point C2 of the side wheel 31 and the side axle 32 extends at right angles to the longitudinal main plane 17 of the frame body 10. Furthermore, the holding wheel member 20 is completely entered into the tube cavity 44 of the slider body 40 and the holding wheel member 30 is completely entered into the tube cavity 54 of the slider body 50. As a result, the spacing T between the side wheel 21 and the side wheel 31 is small. As a result, however, the side wheel 21 and the side wheel 31 do not come into contact with the ground in the rest position of the main wheels 13, 14 of the frame body 10.

[0053] In the "collapsed" state of the convertible device 1, a child can sit on the support member 15 of the convertible device 1 and use the same as a balance bike, by steering the steering column 16 with the handlebar 16a, thereby rotating the main wheel 13 connected to the wheel axle 11 and rotating around the wheel axle 11.

[0054] It should also be noted that the slider bodies 40, 50, 60, 70, the holding wheel members 20, 30 and the support members 80, 90 are preferably made of plastic, however, these components can also be made of metal.

[0055] Reference is now made to Figure 4 to Figure 6 The figures show Figure 1 to Figure 3 The frame body 10 shown in the figures in the state in which the holding wheel members 20, 30 and the support members 80, 90 are expanded outwardly, i.e. in the "stroller state".

[0056] In Figure 4 and Figure 6 It can be well observed in Figures 1 and 2 that in the expanded end position of the holding wheel member 20 entered into the tube cavity 44 of the slider body 40 and the holding wheel member 30 located in the tube cavity 54 of the slider body 50, the side wheel 31, 21 is supported on the ground by means of the curved shape of the slider body 40 and the holding wheel member 20 and the curved shape of the slider body 50 and the holding wheel member 30, however, the main wheel 13 supported by the side wheel 31 is not in contact with the ground, the main wheel 14 still rests on the ground.

[0057] In Figure 6It is also observed that the height and relative distance of the first end portions 82, 92 of the support members 80, 90, which extend outwardly from the slide bodies 60, 70, respectively, cause the connection protrusions 81, which are located at the end portions 82 of the support member 80 and which engage the connection protrusions 91 located at the end portions 92 of the support member 90, to be in an ergonomic position corresponding to the position of the handlebar of the stroller. In this state, the light-weight frame body portion support 18, which is suitable for functioning as a child's backrest, is introduced into the space region between the raised support members 80, 90 and the frame body portion 10.

[0058] In addition, as shown in Figure 5 the interval T between the side wheels 21 of the extended (pulled out) holding wheel member 20 and the side wheels 31 of the extended holding wheel member 30 is larger than Figure 3 the state of the convertible device 1 shown in (balanced bicycle state). However, the connecting points CI connecting the side wheels 21 and the side shafts 22 and C2 connecting the side wheels 31 and the side shafts 32, and the straight line E extending at a right angle with respect to the longitudinal main plane 17 of the frame body portion 10 are still in a state of mutually symmetrical positions of the components of the convertible device 1 located on both sides of the longitudinal main plane 17 of the convertible device 1.

[0059] For ease of understanding, in Figure 6 part of the support member 80, the slide body 60, the support member 90 and the slide body 70 are cut away and shown, the synchronization unit 6 can be more easily observed. The position of the synchronization unit 6 on the frame body portion 10 of the convertible device 1 is better shown in Figure 6 The synchronization unit 6 includes a rotating transmission shaft 6a, a transmission member 6b attached to the rotating transmission shaft 6a, transmission members 6c, 6d and 6e to enable the holding wheel members 20, 30, the support members 80 and 90 to easily move in a synchronized manner. The rotating transmission shaft 6a is rotatably connected to the frame body portion 10, while the transmission members 6b, 6c, 6d and 6e are connected to the holding wheel members 20, 30, the support members 80 and 90, respectively, in a manner to enable torque transmission. In the case of the described embodiment, the transmission members 6b, 6c, 6d and 6e are implemented by gears connected to corresponding racks provided in the holding wheel members 20, 30, the support members 80 and 90, respectively.

[0060] During use of the convertible device 1 of the present application, in the "collapsed" state, a child can sit on the support member 15 mounted on the frame body portion 10 of the convertible device 1, as in a conventional balance bicycle, and can control the main wheel 13 of the convertible device 1 by turning the steering column 16 using the handlebar 16a.

[0061] In the conversion process, when the user pulls the connecting protrusion 81 of the support member 80 and / or the connecting protrusion 91 of the support member 90, in the present invention, by means of the synchronization unit 6 which is incorporated in the frame body part 10, the support member 80 starts to slide outwards from the tube cavity 64 of the slider body 60. The outwards sliding movement of the support member 80 is accelerated by the facilitated-low-friction-sliding member 4 which is adapted to move along the guide rail 61 around the tube cavity 64 of the slider body 60.

[0062] As the support member 80 advances outwards from the slider body 60, it rotates the transmission member 6d (which is connected to the support member 80 in a manner to achieve torque transmission) around the rotation transmission shaft 6a of the synchronization unit 6. In turn, the rotation transmission shaft 6a is rotated by the transmission member 6d. In addition, the rotating rotation transmission shaft 6a rotates the transmission member 6e, so that it also exerts a force on the support member 90 which is adapted to slide outwards from the previously accommodated tube cavity 64 of the slider body 70 by virtue of the positive coupling structure with the transmission member 6e.

[0063] At the same time, the transmission members 6b, 6c which are firmly attached to the rotation transmission shaft 6a of the synchronization unit 6 are also rotated. The transmission members 6b, 6c exert a force on the holding wheel member 20 and the holding wheel member 30, respectively. This will also cause the holding wheel member 20 to start moving outwards from the tube cavity 44 of the slider body 40 and the holding wheel member 30 to start moving outwards from the tube cavity 54 of the slider body 50. Thus, the holding wheel members 20, 30 and the support members 80, 90 move (slide) outwards in a coordinated manner from their respective initial positions.

[0064] Since the holding wheel member 20 and the slider body 40 as well as the holding wheel member 30 and the slider body 50 have a curved shape and the inclination angle a of the frame body part plane 43 comprising the center line 42 of the guide rail 41 with respect to the frame body part plane 53 comprising the center line 52 of the guide rail 51 is greater than 0 (preferably an acute angle), the guide rails 41, 51 are separated from each other and point downwards. As a result, the end of the holding wheel member 20 which is provided with the side wheel 21 and the end of the holding wheel member 30 which is provided with the side wheel 31 start to move away from each other, while they also gradually move away from the handlebar 16a in the vertical direction.

[0065] When the sliding member 4 of the support member 80 reaches its outer end position, the side wheels 21, 31 not only have contacted the ground, but also have lifted the frame body part 10 of the convertible device 1, so that the main wheel 13 is not in contact with the ground. The synchronization unit 6 is able to lock in this position, so that the holding wheel member 20 or the holding wheel member 30 cannot slide back (in the direction of the initial position) into the tube cavity 44 of the sliding member body 40 or the tube cavity 54 of the sliding member body 50. Thus, in this position, only the main wheel 14 (as front wheel of the pram) and the side wheels 21, 31 (as rear wheels) are in contact with the ground. Thereby, the convertible device 1, which is now in the pram state, becomes easy to maneuver.

[0066] During the lifting process described above, due to the oblique angle β between the frame body part planes 63, 73 of the sliding member bodies 60, 70, which comprise the center lines 62, 72 of the guide rails 61, 71, the end 82 of the support member 80 near the connecting protrusion 81 and the end 92 of the support member 90 near the connecting protrusion 91 gradually move away from each other. Thereby, the distance between the connecting protrusion 81 and the connecting protrusion 91 increases to an extent that the protrusions can be used to push the pram comfortably. Furthermore, the frame body part support 18, in which the child is seated, can also be attached to the connecting protrusion 81, the connecting protrusion 91 and the frame body part 10.

[0067] When the device is to be used as a balance bike again, the pram can be converted back into a balance bike by reversing the steps of the conversion process. When the connecting protrusion 81 of the support member 80 and / or the connecting protrusion 91 of the support member 90 are pressed in the direction of the frame body part 10 after the synchronization unit 6 has been released, the rotating drive shaft 6a of the synchronization unit 6 starts to rotate and, with the help of the drive members 6b, 6c, 6d and 6e, the synchronization unit 6 basically pushes the support member 80 into the tube cavity 64 of the sliding member body 60, the support member 90 into the tube cavity 74 of the sliding member body 70, the holding wheel member 20 into the tube cavity 44 of the sliding member body 40 and also the holding wheel member 30 into the tube cavity 54 of the sliding member body 50, essentially by itself. When the support members 80, 90 slide back, the frame body part support 18 - together with the connecting protrusion 81 and the connecting protrusion 91 - closes and retracts towards the frame body part 10 of the convertible device 1.

[0068] When the holding wheel members 20, 30 are moved back in a coordinated manner in the direction of the frame body part 10, the frame body part 10 near the main wheel 13 is lowered first, because the side wheels 21, 31 are lifted from the ground, then the main wheel 13 contacts the ground and subsequently the convertible device 1 is supported by the main wheels 13, 14 again. The support members 80, 90 retract into the sliding member bodies 60, 70, respectively, while the handlebar 16a on the opposite side of the main wheel 13, which is located at the end of the steering column 16, is released, i.e. the handlebar 16a can rotate again.

[0069] The convertible device of the present application is particularly suitable for situations where the functions of a stroller and a balance bike need to be performed by a single, quick and easy convertible device.

Claims

1. A convertible device used as a child's sports equipment or baby carriage, include: The frame body (10) At least two main wheels (13, 14) are connected to the frame body (10) via wheel axles (11, 12), and A first supporting member (15) can be arranged on the frame main body (10); One axle (11) of a main wheel (13) is connected to a steering column (16), and the steering column (16) is rotatably connected to the vehicle frame main body (10). Another axle (12) of another main wheel (14) is connected to the vehicle frame main body (10). The convertible device is characterized in that The invention relates to a bicycle frame having at least two side wheels (21, 31) with adjustable distances, which are spaced apart at a variable distance (T) on both sides of a longitudinal main plane (17) of the bicycle frame main part (10), each of the side wheels (21, 31) being rotatably connected to a corresponding wheel holding member (20, 30) via a corresponding side shaft (22, 32), the wheel holding member (20, 30) being movably connected to the bicycle frame main part (10), and comprising at least one corresponding first sliding member of a corresponding first curved guide rail (41, 51) The main body (40, 50) is arranged on the frame main body (10) and is mirror-symmetrical relative to the longitudinal main plane (17) of the frame main body (10) on both sides of the longitudinal main plane (17). A first sliding member main body (40) is used to support a wheel holding member (20) with a side wheel (21), and another first sliding member main body (50) is used to partially receive another wheel holding member (30) with another side wheel (31). The first sliding member main body (40, 50) includes The invention relates to a first sliding member (2, 3), wherein the first sliding member (2, 3) is configured to have a size and shape corresponding to the first curved guide rail (41, 51) of the first sliding member body (40, 50) and is capable of moving along the first curved guide rail (41, 51) of the first sliding member body (40, 50), a first frame plane (43) including a first center line (42) of a first curved guide rail (41) of the first sliding member body (40) and another first frame plane (53) including another first center line (52) of another first curved guide rail (51) of the other first sliding member body (50) are arranged to be mirror-symmetrical with respect to the longitudinal main plane (17) of the frame main body (10), and the first curved movement path (2a, 3a) of the first sliding member (2, 3) and the first center line (42, 52) of the first curved guide rail (41, 51) of the first sliding member body (40, 50) form mutually corresponding circular arcs.

2. The convertible device according to claim 1, characterized in that A first sliding member (2) is connected to the one wheel holding member (20), another first sliding member (3) is connected to the other wheel holding member (30), and each of the wheel holding members (20, 30) is slidably engaged with the corresponding first sliding part body (40, 50) through the first sliding member (2, 3).

3. The convertible device according to claim 2, characterized in that The one wheel holding member (20) and the one first sliding member (2) are respectively formed by a single piece, and the other wheel holding member (30) and the other first sliding member (3) are also formed by a single piece.

4. The convertible device according to claim 2 or 3, characterized in that: The wheel holding members (20, 30) have corresponding center lines (23, 33), and the shape of the center line (23, 33) of each wheel holding member (20, 30) is the same as the shape of the first center line (42, 52) of the first curved guide rail (41, 51) of the first slider body (40, 50), and the first slider body (40, 50) is suitable for working in conjunction with the wheel holding members (20, 30).

5. The convertible device according to claim 1, characterized in that: A straight line (E) connecting the connection points (C1, C2) between the side wheels (21, 31) of each wheel-holding member (20, 30) and the side shafts (22, 32) cooperating with the side wheels (21, 31) is perpendicular to the longitudinal main plane (17) of the frame body (10).

6. The convertible device according to claim 1, characterized in that: The connection points (C1, C2) between the side wheels (21, 31) of each wheel-holding member (20, 30) and the side shafts (22, 32) adapted to cooperate with the side wheels (21, 31) are arranged at at least a portion of the outer end positions of the wheel-holding members (20, 30) and are symmetrical relative to the longitudinal main plane (17) of the frame body (10).

7. The convertible device according to claim 1, characterized in that: The first slider body (40, 50) and the wheel holding member (20, 30) are formed by a tube segment, and the first slider member (2, 3) and the wheel holding member (20, 30) are telescopic and at least partially inserted into the first tube cavity (44, 54) of the first slider body (40, 50).

8. The convertible device according to claim 1, characterized in that: Also includes: A synchronization unit (6), wherein the synchronization unit (6) comprises a rotation transmission shaft (6a) and first transmission components (6b, 6c) fixed to the rotation transmission shaft (6a), and each of the first transmission components (6b, 6c) is connected to the corresponding holding wheel component (20, 30) in a transmission motion manner.

9. The convertible device according to claim 8, characterized in that: Also includes: A second support member (80, 90) is used to connect a frame seat (18), wherein each of the second support members (80, 90) includes a connecting protrusion (81, 91) capable of fixing the frame seat (18), and a second sliding member body (60, 70) including a respective second curved guide rail (61, 71) is arranged on the frame main body (10), and the second sliding member body (60, 70) is mirror-symmetrical with respect to the longitudinal main plane (17) of the frame main body (10) on both sides of the longitudinal main plane (17), and each of the second sliding member bodies (60, 70) is connected to The second sliding member (4, 5) has a size and shape corresponding to the second curved guide rail (61, 71) of the second sliding member body (60, 70) and is capable of moving along the second curved guide rail (61, 71) of the second sliding member body (60, 70), a second frame plane (63) including a second center line (62) of a second curved guide rail (61) of a second sliding member body (60) and another second frame plane (73) including another second center line (72) of another second curved guide rail (71) of another second sliding member body (70) The second frame plane (63) including the second center line (62) of the second curved guide rail (61) of the second sliding member body (60) and the second frame plane (73) including the second center line (72) of the second curved guide rail (71) of the second sliding member body (70) form an acute angle (β) with each other, and the second curved movement path (4a, 5a) of the second sliding member (4, 5) and the second center line (72) of the second sliding member body (60, 70) are arranged in mirror symmetry with respect to the longitudinal main plane (17) of the frame main body (10), and the second frame plane (63) including the second center line (62) of the second curved guide rail (61) of the second sliding member body (60, 70) and the second frame plane (73) including the second center line (72) of the second curved guide rail (71) of the second sliding member body (70) form an acute angle (β) with each other. The second center lines (62, 72) of the curved guide rails (61, 71) form circular arcs corresponding to each other, an end portion (83) of a second supporting member (80) on the side opposite to the other end portion (82) holding a connecting protrusion (81) is connected to a second sliding member (4), and an end portion (93) of another second supporting member (90) on the side opposite to the other end portion (92) holding another connecting protrusion (91) is connected to another second sliding member (5), and each of the second supporting members (80, 90) is slidably coupled to the corresponding second sliding member body (60, 70) via the second sliding members (4, 5).

10. The convertible device according to claim 9, characterized in that: The first second support member (80) and the first second sliding member (4) are respectively formed of a single piece, and the second second support member (90) and the second second sliding member (5) are also formed of a single piece.

11. The convertible device according to claim 9, characterized in that The synchronization unit (6) further comprises a second transmission member (6d, 6e) fixed to the rotation transmission shaft (6a), and each of the second transmission members (6d, 6e) is connected to the corresponding second support member (80, 90) in a transmission motion manner.

12. The convertible device according to claim 9, characterized in that The second slider body (60, 70) and the second support member (80, 90) are formed by a tube segment, and the second slider member (4, 5) and the second support member (80, 90) are telescopic and at least partially inserted into the second tube cavity (64, 74) of the second slider body (60, 70).

13. The convertible device according to claim 1, characterized in that The first frame plane (43) including the first center line (42) of the first curved guide rail (41) of the first sliding member body (40) and the other first frame plane (53) including the other first center line (52) of the other first curved guide rail (51) of the other first sliding member body (50) form an inclination angle (α) less than 180° with each other.

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