Electric bicycle with drive battery arrangement and drive battery arrangement for an electric bicycle

Abstract

Electric bicycle (1) with a bicycle frame (2) and at least one battery arrangement (8) having a drive battery (6), wherein the drive battery (6) has a fastening device (12) for detachable fastening to a frame-side holder (10) with a fastening projection (14), and a receptacle (20) of the drive battery (6) can be brought into engagement with the fastening projection (14) in such a way that the drive battery (6) can be pivoted about the fastening projection (14) into the holder (10) and locked by means of a locking lever (22), characterized by a locking element (26) assigned to the drive battery (6), wherein the locking element (26) can be brought into engagement with the frame-side holder (10) for locking the drive battery (6).

Description

[0001] The present invention relates to an electric bicycle according to the preamble of claim 1 and a drive battery arrangement for an electric bicycle according to the preamble of claim 16.

[0002] Electric bicycles, so-called e-bikes, with electric motor support are known from the prior art. These bicycles, in addition to a main battery, have an additional battery to increase range. The additional battery can be attached to a frame-side bracket on a frame tube, such as a top, down, or seat tube of the bicycle frame. The bracket can be attached, for example, to attachment points of a water bottle holder. In such systems, the additional battery is inserted into the frame-side bracket, particularly from above or below, and locked. In alternative battery arrangements, the additional battery is pushed into the bracket lengthwise along the frame tube.

[0003] Furthermore, battery arrangements are known according to which the frame-side holder has two projections arranged at a distance from one another, wherein the additional battery can be suspended in a projection forming a pivot axis and can be pivoted into the second projection with a locking system of the additional battery.

[0004] From the prior art according to utility model DE 20 2024 104 592 U1, a drive battery assembly is known, according to which a drive battery has a fastening device for releasably attaching it to a frame-side mount with a fastening projection. The drive battery receptacle can be brought into engagement with the fastening projection of the frame-side mount such that, during installation, the drive battery can be pivoted around the fastening projection into the frame-side mount and locked by means of a locking lever. After actuating the locking lever, the drive battery can be pivoted out and removed.

[0005] The disadvantage of this solution is that the drive battery is only secured by the locking hook.

[0006] The invention is therefore based on the object of providing an electric bicycle and a drive battery arrangement for an electric bicycle with an additional securing of the drive battery in a compact design, which enables quick and easy assembly and disassembly of the drive battery or additional battery.

[0007] This object is achieved by an electric bicycle having the combination of features of claim 1 and by means of a drive battery arrangement for an electric bicycle according to claim 16.

[0008] The electric bicycle according to the invention comprises a bicycle frame and at least one drive battery assembly having a drive battery, wherein the drive battery has a fastening device for releasably fastening it to a frame-side holder, and wherein the holder has a fastening projection, and a receptacle for the drive battery can be brought into engagement with the fastening projection such that the drive battery can be pivoted into the holder about the fastening projection and locked by means of a locking lever. According to the invention, a locking element is assigned to the drive battery, which can be brought into engagement with the frame-side holder to lock the drive battery. This enables additional locking. The drive battery is secured in addition to the locking lever. Due to the arrangement of the locking element on the drive battery, it can be easily operated by the operator.Preferably, the locking lever is then operated and the drive battery is swung out.

[0009] The locking element is preferably designed as an additional security device.

[0010] It has proven particularly advantageous to associate a lock assembly with the locking element. The integration of the lock into the drive battery allows for theft protection while maintaining an extremely compact design. The length of the bracket is not increased due to the lock assembly. A small standard lock can be used. Overall, this allows for an extremely compact design of the drive battery.

[0011] The lock arrangement can be retrofitted in an embodiment according to the invention.

[0012] It is advantageous if the locking element's longitudinal axis extends parallel to the battery's longitudinal axis. This allows for a very small installation space.

[0013] It is also particularly advantageous if the lock arrangement is designed such that the lock's longitudinal axis extends parallel to the battery's longitudinal axis. Due to the lock's integration into the drive battery and the lock's longitudinal axis in the longitudinal direction of the battery's longitudinal axis, a very small installation space is possible.

[0014] According to an advantageous embodiment of the invention, the locking element is axially and translationally displaceable between a locking position and an unlocking position.

[0015] In a preferred embodiment of the invention, the locking element has at least one latch.

[0016] Advantageously, the latch is designed as an angle latch. The angle latch is preferably approximately L-shaped and has an engagement portion and a fastening portion. The engagement portion and fastening portion of the angle latch are preferably arranged at right angles to each other.

[0017] According to an advantageous embodiment of the invention, the fastening section of the angle bolt is connected to the lock cylinder via a threaded section. The angle bolt can be screwed into a threaded bushing of the lock cylinder.

[0018] It is particularly advantageous if the locking element, i.e., in particular the angle lever, can be positively engaged with a locking recess of a guide track of the holder for receiving a guide projection of the drive battery. This prevents any pivoting movement of the drive battery when the lock assembly is closed. The drive battery is securely secured against pivoting out, thus ensuring theft protection.

[0019] The locking recess is preferably formed in a wall of the guideway.

[0020] In a preferred embodiment, an end portion, in particular the engagement portion of the locking element, is guided in a longitudinal groove on the housing side in a rotationally secure but translationally movable manner. This prevents rotation of the angled bolt and allows only a linear displacement between the unlocking and locking positions.

[0021] The locking element is advantageously connected to a locking cylinder of the lock arrangement and is axially displaceable after unlocking.

[0022] Preferably, the locking cylinder is spring-loaded in the axial unlocking direction.

[0023] To unlock the drive battery, the key is inserted into the lock assembly and turned in the unlocking direction. This causes the spring-loaded locking cylinder and thus the angle lever to spring into the unlocked or open position. The angle lever then releases the locking recess. After actuating a locking lever on the holder, the drive battery can be pivoted out of the holder. To lock, the drive battery is pivoted into the holder and then the locking cylinder is axially actuated against the force of the spring into its closed position. The angle bolt engages the locking recess and prevents it from pivoting out.

[0024] According to the invention, it is particularly preferred if the lock arrangement is designed as a drum lock with a round cylinder and a hollow key (so-called tubular lock). Such lock arrangements are particularly compact and offer good theft protection.

[0025] Particularly preferably, the lock assembly is arranged on a narrow side of the drive battery. The lock assembly is preferably accessible from the front.

[0026] Preferably, the lock assembly is arranged below the battery cells of the drive battery. The battery electronics can also be arranged in this area, so that this area can also be advantageously used for the lock assembly.

[0027] Preferably, the drive battery receptacle can be engaged with the mounting projection of the frame-side bracket such that, during installation, the drive battery can be pivoted around the mounting projection into the frame-side bracket and locked by means of a locking lever. The locking lever is advantageously biased into its locked position by the force of a spring. With the lock open and after actuating the locking lever, the drive battery can be pivoted out and removed. This enables quick and easy installation and removal of the drive battery.

[0028] In a preferred embodiment of the invention, the electric bicycle has a bicycle frame, with a main battery being insertable at least partially into the bicycle frame, with the drive battery being provided as an additional battery. The bicycle has a main battery and an additional battery.

[0029] In the following, the terms drive battery and additional battery can be used interchangeably.

[0030] According to the invention, it is preferred if the locking lever automatically engages and secures the drive battery during pivoting in, for example, by means of a locking projection. The drive battery can thus be attached, pivoted in, and secured with one hand. The locking lever is preferably automatically tensioned by means of an inclined surface and automatically snaps into a locking recess.

[0031] It has proven particularly advantageous if the mount has a guide track for accommodating a guide projection of the drive battery. The drive battery is preferably pivoted into the guide track of the frame-side mount during installation using the guide projection. This securely fixes the drive battery relative to the bicycle frame.

[0032] The fastening projection of the holder preferably has a head section with an increased width compared to a shaft section.

[0033] According to a preferred embodiment of the invention, the fastening projection is cylindrical and has a head portion with a larger diameter than a shaft portion. Preferably, the fastening projection is approximately mushroom-shaped.

[0034] Preferably, the fastening projection has a cylindrical shaft region, wherein a head portion is designed as a partial cylinder.

[0035] In an alternative embodiment of the invention, the fastening projection has a triangular cross-section at least in sections.

[0036] According to an advantageous embodiment of the invention, the drive battery holder is approximately U- or V-shaped. The opening of the U- or V-shaped holder is preferably oriented toward the end section of the drive battery. This allows the drive battery to be inserted into the holder and pivoted particularly easily.

[0037] When installed, the mounting projection preferably engages behind a stepped shoulder of the drive battery mount with its head. This ensures that the drive battery is positively secured in this area relative to the mount.

[0038] It has proven particularly advantageous if the guideway is curved in an arc shape at least in sections.

[0039] The radius of curvature preferably corresponds to the distance of the guideway to the center of the fastening projection.

[0040] According to the invention, it is advantageous if the guide track is designed as an approximately U-shaped guide rail with two opposing guide cheeks connected via a central region. The curved guide rail is preferably arranged next to the locking lever on the side of the fastening projection.

[0041] Preferably, the guide cheeks are designed to be inclined relative to each other. This allows the guide projection of the drive battery to be inserted laterally into the guide track with a positive fit and then held in place in such a way that it is immobile in a direction away from the holder.

[0042] In a preferred embodiment, the guide projection of the drive battery is provided with two opposing, outward-facing cantilever projections.

[0043] In an advantageous embodiment, the locking lever is provided on the bracket. It has proven particularly advantageous if the locking lever is provided outside the guideway in the area of a free end of the bracket opposite the fastening projection.

[0044] The locking lever preferably extends transversely to a longitudinal plane of the bicycle frame.

[0045] It is particularly advantageous if the locking element of the locking lever has a locking projection that can be engaged with a locking recess in the drive battery. When the locking lever is actuated via the actuating section, the spring tongue moves away from the drive battery, disengaging the locking projection from the locking recess in the drive battery. The drive battery is now unlocked and can be pivoted. This disengages the guide projection of the drive battery from the guide track of the holder. The drive battery can now be pulled out of the holder, with the fastening projection moving out of the drive battery receptacle.

[0046] Between the mounting projection and the locking lever, two mounting recesses, preferably elongated holes, are preferably arranged, each for receiving a mounting screw. The mounting points are preferably the mounting threads on the frame side for a bottle holder.

[0047] According to the invention, the drive battery can be pivoted laterally into a frame triangle of the bicycle frame. In a preferred embodiment, the drive battery can be secured to the underside of a top tube of the bicycle frame by means of the bracket. According to an alternative embodiment, the drive battery can be fixed to the top of a down tube of the bicycle frame by means of the bracket. In another preferred embodiment, the drive battery can be mounted on a seat tube.

[0048] The drive battery arrangement according to the invention is particularly advantageously suitable for universal mounting on bicycle frames of different designs.

[0049] A drive battery assembly according to the invention for an electric bicycle has a drive battery, wherein the drive battery has a fastening device for releasable fastening to a frame-side holder, and wherein the holder has a fastening projection, and a receptacle of the drive battery can be brought into engagement with the fastening projection such that the drive battery can be pivoted about the fastening projection into the holder and locked by means of a locking lever. According to the invention, a locking element is assigned to the drive battery, wherein the locking element can be brought into engagement with the frame-side holder for locking the drive battery. This additionally secures the drive battery in addition to the locking lever.

[0050] According to a particularly advantageous embodiment, the locking element is axially displaceable between a locking position and an unlocking position.

[0051] It has proven particularly advantageous to have a lock assembly associated with the locking element. This provides theft protection.

[0052] The locking element longitudinal axis preferably extends parallel to a battery longitudinal axis of the drive battery.

[0053] The drive battery can be used as the sole drive battery or main battery on the bicycle. Alternatively, the drive battery can be used as an additional battery in addition to a main battery, for example, located in the frame.

[0054] Further preferred embodiments are the subject of the subclaims.

[0055] A preferred embodiment of the present invention will be explained in more detail below with reference to the accompanying drawings. The drawings show in detail: Fig. 1 a plan view of an electric bicycle according to the invention in the area of an additional battery; Fig. 2 a perspective view of the additional battery and a bracket before battery installation; Fig. 3 a sectional view of the additional battery mounted on the bracket; Fig. 4 a perspective view of the additional battery and the holder from below; Fig. 5 a sectional view in the area of the lock arrangement and Fig. 6 a plan view in the area of the lock arrangement.

[0056] Fig. Figure 1 shows a plan view of an electric bicycle 1 according to the invention, comprising a schematically illustrated bicycle frame 2 in the region of a top tube 4 with an additional battery assembly 8 comprising an additional battery 6 or drive battery mounted on a frame-side mount 10. In this exemplary embodiment according to the invention, a main battery is provided in the frame, and the additional battery 6 is provided as an additional range extender. The additional battery 6 has a fastening device 12 for releasably attaching it to the frame-side mount 10.

[0057] Fig. 2 shows a perspective view of the additional battery 6 and the holder 10 before mounting the additional battery 6 without a bicycle frame.

[0058] According to Fig. 3, which shows a sectional view of the additional battery 6 mounted on the holder 10, the holder 10 has a fastening projection 14. The fastening projection 14 is cylindrical and has a head portion 16 with a diameter that is larger than a shaft portion 18. A receptacle 20 of the additional battery 6 is engaged with the fastening projection 14 of the frame-side holder 10 in such a way that the additional battery 6, when mounted, can be pivoted around the fastening projection 14 into the frame-side holder 10 and locked by means of a locking lever 22. After actuating the locking lever 22, the additional battery 6 can be pivoted out and removed.

[0059] The additional battery 6 is assigned a lock assembly 24 with a locking element 26, a locking cylinder 28, and a key 30, wherein the locking element longitudinal axis 32 or lock longitudinal axis of the lock assembly 24 extends parallel to the battery longitudinal axis 34 of the additional battery. The additional battery 6 is secured by means of the locking element 26 in addition to the locking lever 22. Due to the lock integration in the drive battery 6 and the locking element or lock longitudinal axis 32 in the longitudinal direction of the battery longitudinal axis 34, a very small installation space is possible. The length of the holder 10 is not increased due to the lock assembly 24. Overall, this enables an extremely compact design.

[0060] As shown below using the Fig. 4, Fig. 5 and Fig. 6, which shows a bottom view of the holder 10 and the additional battery 6, a sectional view in the area of the lock assembly 24, and a top view in the area of the lock assembly 24, the locking element 26 for locking the additional battery 6 can be brought into engagement with the frame-side holder 10. The locking state of the lock assembly 24 is illustrated in the figures.

[0061] The locking element 26 is axially displaceable between a locking position and an unlocking position (see movement arrow). The locking element is designed as an angled bolt 26. The angled bolt 26 is L-shaped and has an engagement portion 36 and a fastening portion 38. The engagement portion 36 and fastening portion 38 of the angled bolt 26 are arranged at right angles to each other.

[0062] The fastening section 38 of the angle bolt 26 is connected to the locking cylinder 28 via a threaded section 40. The angle bolt 26 is screwed into a threaded bushing 42 of the locking cylinder 28. The angle bolt 26 is connected to the locking cylinder 28 of the lock assembly 24 and is axially displaceable after unlocking with the key 30. The locking cylinder 28 is spring-loaded in the axial unlocking direction. After opening with the key, the angle bolt therefore reaches its open position, where it is in Fig. 5 moved to the right by spring force.

[0063] To lock the additional battery 6, the angle lock 26 can be brought into positive engagement with a locking recess 44 of a guide track 46 of the holder 10 for receiving a guide projection 48 of the additional battery 6 (see Fig. 2, Fig. 3, Fig. 5 and Fig. 6). The locking recess 44 is formed in a wall 50 of the guide track 46.

[0064] The engagement section 36 of the angled bolt 26 is guided in a housing-side longitudinal groove 52, which is guided in a wall 54 of the guide projection 48 in a rotationally secure manner. This prevents rotation of the angled bolt 26 about its longitudinal axis and allows only a linear displacement (see double arrow direction) between the unlocking and locking positions.

[0065] To unlock the additional battery 6, the key 30 is inserted into the locking cylinder 28 and turned in the unlocking direction. This causes the spring-loaded locking cylinder 28 and thus also the angle lever 26 to jump into the unlocking direction into its open position. From the locking position shown, Fig. 5, a movement to the right into the unlocked position. The angle lever 26 releases the locking recess 44. After actuating the locking lever 22 of the holder 10, the additional battery 6 can then be pivoted out of the holder 10. To lock, the additional battery 6 is pivoted into the holder 10, whereby the locking lever 22 engages the additional battery 6. The locking cylinder 28 is then moved axially against the force of the spring into its closed position and locks there, with the angle bolt 26 inserting into the locking recess 44 and preventing it from pivoting out.

[0066] The lock arrangement 24 is arranged on a narrow side 56 of the drive battery and is designed as a drum lock with a round cylinder and hollow key.

[0067] As in particular Fig. As can be seen from Figure 3, the lock assembly 24 is arranged below the battery cells 58 of the additional battery 6. The battery electronics 60 are also provided in this area, so that this area can also be advantageously used for the lock assembly 24.

[0068] According to Fig. 2 and Fig. 4, two fastening recesses designed as elongated holes 62, 64 are arranged between the fastening projection 14 and the locking lever 22, each for receiving a fastening screw 66, 68. The fastening points are the frame-side fastening threads for a bottle holder.

[0069] As shown by Fig. 2 will now be explained in detail, the holder 10 has a guide track 46 for receiving a guide projection 48 of the additional battery 6. The guide track 46 is curved in an arc and extends transversely across the entire width of the holder 10. The radius of curvature corresponds to the distance of the guide track 46 from the center of the fastening projection 14. The guide track 46 is designed as an approximately U-shaped guide rail with two guide cheeks located opposite one another and connected via a central region. The guide rail 46 is arranged next to the locking lever 22. The guide cheeks are inclined relative to one another. As a result, the guide projection 48 of the additional battery 6 can be inserted laterally into the guide track 46 in a form-fitting manner and is then held in such a way that it is immobile in a direction away from the holder 10.

[0070] The locking lever 22 is provided on the holder 10 outside the guide track 46 in the area of a free end of the holder 10. The locking lever 22 is connected to the holder 10 via a hinge pin 80 (see Fig. 2) pivotally connected to the holder 10 and in its closing direction by the force of a spring 70 (see Fig. 6). The locking lever 22 extends transversely to a longitudinal plane of the bicycle frame 2 and has a spring tongue with a locking projection 72 and an actuating portion 74 provided adjacent thereto.

[0071] During assembly, the additional battery 6 is pivoted with the guide projection 48 into the guide track 46 of the frame-side holder 10 until the locking projection 72 of the locking lever 22 of the holder 10 fits into an approximately rectangular, pocket-like locking recess 76 (see Fig. 4) of the additional battery 6. The additional battery 6 can be electrically connected to the bicycle via a connecting cable 78.

[0072] According to Fig. 4, the guide projection 48 of the additional battery 6 is curved in an arc-shaped manner corresponding to the guide track 46 and has a head section with two projections projecting opposite one another.

[0073] The disassembly or removal of the additional battery 6 is explained below. In a first step, the locking cylinder 28 is unlocked using the key 30, so that the spring-loaded locking cylinder 28 with angle bolt 26 disengages from the locking recess 44. After unlocking, the lock remains in the open position. Subsequently, the locking lever 22 is actuated via the actuating section 74 in the direction of the bicycle frame, whereby the spring tongue moves away from the additional battery 6, so that the locking projection 72 of the locking lever 22 is disengaged from the locking recess 76 of the additional battery 6. The additional battery 6 is unlocked and can be pivoted. This disengages the guide projection 48 of the additional battery 6 from the guide track 46 of the holder 10.The additional battery 6 can now be removed from the holder 10, whereby the fastening projection 14 moves out of the receptacle 20 of the additional battery 6 so that it is completely released.

[0074] Disclosed is an electric bicycle 1 having a bicycle frame 2 and at least one battery assembly 8 having a drive battery 6, wherein the drive battery 6 has a fastening device 12 for releasably fastening to a frame-side holder 10, wherein the holder 10 has a fastening projection 14 and a receptacle 20 of the drive battery 6 can be brought into engagement with the fastening projection 14 such that the drive battery 6 can be pivoted about the fastening projection 14 into the holder 10 and locked by means of a locking lever 22. According to the invention, an additional locking element 26 is provided, wherein the locking element 26 can be brought into engagement with the frame-side holder 10 to lock the drive battery 6.Furthermore, a drive battery arrangement 8 for an electric bicycle 1 is disclosed, wherein an additional locking element 26 is provided which can be brought into engagement with the frame-side holder 10 in order to lock the drive battery 6. List of reference symbols 1 electric bike 2 bicycle frames 4 top tube 6 additional battery / drive battery 8 Drive battery arrangement 10 Bracket 12 Fastening device 14 Mounting projection 16 Head section 18 Shaft area 20 recordings 22 locking lever 24 Lock arrangement 26 Locking element 28 locking cylinders 30 keys 32 Locking element longitudinal axis 34 Battery longitudinal axis 36 intervention section 38 fastening section 40 threaded section 42 threaded bushing 44 Locking recess 46 guideway 48 lead 50 wall 52 Longitudinal groove 54 wall 56 narrow side 58 battery cells 60 Battery electronics 62 slot 64 slot 66 fixing screw 68 fixing screw 70 spring 72 locking projection 74 Operating section 76 Recess 78 connecting cables 80 hinge pins QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2024 104 592 U1

[0004]

Claims

[1] Electric bicycle (1) with a bicycle frame (2) and at least one battery arrangement (8) having a drive battery (6), wherein the drive battery (6) has a fastening device (12) for releasably fastening it to a frame-side holder (10) with a fastening projection (14) and a receptacle (20) of the drive battery (6) can be brought into engagement with the fastening projection (14) in such a way that the drive battery (6) can be pivoted about the fastening projection (14) into the holder (10) and locked by means of a locking lever (22), characterized by a locking element (26) associated with the drive battery (6), wherein the locking element (26) can be brought into engagement with the frame-side holder (10) for locking the drive battery (6). [2] Electric bicycle according to claim 1, wherein the locking element (26) is axially displaceable between a locking position and an unlocking position. [3] Electric bicycle according to claim 1 or 2, wherein the locking element (26) is associated with a lock arrangement (24). [4] Electric bicycle according to one of the preceding claims, wherein a locking element longitudinal axis (32) extends parallel to a battery longitudinal axis (34) of the drive battery (6). [5] Electric bicycle according to one of the preceding claims, wherein the locking element (26) comprises a latch. [6] Electric bicycle according to claim 5, wherein the latch is designed as an angle latch (26). [7] Electric bicycle according to one of the preceding claims, wherein the locking element (26) can be brought into positive engagement with a locking recess (44) of a guide track (46) of the holder (10) for receiving a guide projection (48) of the drive battery (6). [8] Electric bicycle according to claim 7, wherein the locking recess (44) is formed in a wall (50) of the guide track (46). [9] Electric bicycle according to one of the preceding claims, wherein an end portion (36) of the locking element (26) is guided in a longitudinal groove (52) in a rotationally secure and translationally movable manner. [10] Electric bicycle according to one of the preceding claims, wherein the locking element (26) is connected to a locking cylinder (28) and is axially displaceable after unlocking by means of a key (30). [11] Electric bicycle according to claim 10, wherein the locking cylinder (28) is spring-loaded in its unlocking direction. [12] Electric bicycle according to one of claims 3 to 11, wherein the lock arrangement (24) comprises a drum lock with a round cylinder and a hollow key (30). [13] Electric bicycle according to one of claims 3 to 12, wherein the lock arrangement (24) is arranged on a narrow side (56) of the drive battery (6). [14] Electric bicycle according to one of the preceding claims, wherein the locking element (26) is arranged below battery cells (58) of the drive battery (6). [15] Electric bicycle according to one of the preceding claims, wherein the fastening projection (14) of the holder (10) has a head portion (16) with an increased width compared to a shaft portion (18). [16] Drive battery arrangement for an electric bicycle (1) with at least one drive battery (6), wherein the drive battery (6) has a fastening device (12) for detachable fastening to a frame-side holder (10) with a fastening projection (14) and a receptacle (20) of the drive battery (6) can be brought into engagement with the fastening projection (14) in such a way that the drive battery (6) can be pivoted about the fastening projection (14) into the holder (10) and locked by means of a locking lever (22), characterized bya locking element (26) associated with the drive battery (6), wherein the locking element (26) can be brought into engagement with the frame-side holder (10) for locking the drive battery (6). [17] Drive battery assembly according to claim 16, wherein the locking element (26) is axially displaceable between a locking position and an unlocking position. [18] Drive battery arrangement according to claim 16 or 17, wherein the locking element (26) is associated with a lock arrangement (24).

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