Foldable dumbbell rack

Abstract

This utility model relates to a foldable dumbbell rack, belonging to the field of sports equipment technology. The foldable dumbbell rack includes a bottom frame, a top frame, and a middle frame. The bottom frame is supported on the ground. The top frame supports dumbbells with trays, and its top is equipped with a clamping assembly for holding the dumbbell tray. One end of the middle frame is rotatably connected to the bottom frame, allowing the middle frame to flip upwards relative to the bottom frame, and the other end is rotatably connected to the top frame, allowing the top frame to flip upwards relative to the middle frame. In the folded state, the bottom frame, middle frame, and top frame are stacked from bottom to top. In the unfolded state, the middle frame flips upwards relative to the bottom frame, and the top frame flips upwards relative to the middle frame, thus widening the distance between the top and bottom frames through the middle frame. This foldable dumbbell rack can be folded and stored after training, meeting the user's space utilization needs when storing dumbbells on a daily basis.

Description

Technical Field

[0001] This utility model belongs to the field of sports equipment technology, and in particular relates to a foldable dumbbell rack. Background Technology

[0002] In the field of fitness equipment, dumbbells, as a common strength training tool, are widely used in homes, gyms, and other locations. Dumbbell racks are shelves used to hold dumbbells. Traditional dumbbell racks typically come in two forms: one is the upright dumbbell rack, which is directly supported on the ground. However, it is relatively large and takes up a lot of space. Furthermore, the fixed angle of the dumbbells requires users to make additional adjustments when retrieving them, increasing inconvenience, especially when multiple people share the same rack, as the different needs of different users become more pronounced, making it difficult to meet diverse usage requirements. Therefore, it is mainly used for storing dumbbells when not in use. The other type is the tray dumbbell rack, which can be placed on a flat surface such as a table or countertop, at a certain height from the ground. It is smaller and suitable for home fitness settings. The dumbbell angle is not fixed, allowing users to adjust the angle according to their habits for easy access. However, it requires a suitable supporting surface during training, placing certain requirements on the space where it is used.

[0003] Patent CN216258914U discloses a multifunctional dumbbell rack that achieves folding through a rotating support unit. Patent CN215822244U discloses an adjustable folding dumbbell rack that achieves folding by hinged upper parts of the left and right support frames to an upper connecting seat. These foldable dumbbell racks combine the advantages of upright dumbbell racks (supported by the ground and requiring no special space) with the compact size of tray-type dumbbell racks, overcoming the disadvantages of the large size of upright dumbbell racks and the special space requirements of tray-type dumbbell racks. However, with the above-mentioned existing foldable dumbbell racks, there is nowhere to put the dumbbells after folding. Therefore, they can usually only be folded for packaging and transportation. When storing dumbbells daily, they still need to be kept in the open state, which cannot meet the user's space utilization needs. Moreover, the above-mentioned existing foldable dumbbell racks still cannot combine the advantages of tray-type dumbbell racks in terms of flexible dumbbell placement angles, and cannot be adapted to the usage habits of different users. Utility Model Content

[0004] This utility model provides a foldable dumbbell rack for supporting dumbbells with trays. It can be used directly on the ground and can be folded for storage after training. Even in the folded state, it can still be used to store dumbbells with trays, thus meeting the user's space utilization needs.

[0005] This utility model provides a foldable dumbbell rack for holding dumbbells with trays, comprising:

[0006] The bottom frame is used to support the ground;

[0007] The top frame, which supports dumbbells with trays, is located above the bottom frame and has a clamping assembly at its top for holding the dumbbell trays.

[0008] The middle frame has one end rotatably connected to the bottom frame so that the middle frame can be flipped upward relative to the bottom frame, and the other end rotatably connected to the top frame so that the top frame can be flipped upward relative to the middle frame.

[0009] In the folded state, the bottom frame, middle frame, and top frame are stacked from bottom to top. In the unfolded state, the middle frame flips upward relative to the bottom frame until the middle frame is tilted relative to the bottom frame, and the top frame flips upward relative to the middle frame until the middle frame is tilted relative to the top frame, so as to widen the distance between the top frame and the bottom frame through the middle frame.

[0010] This technical solution achieves a simple and quick switching between the folded and unfolded states of the dumbbell rack by rotating the bottom frame, middle frame, and top frame relative to each other.

[0011] In some embodiments, a first angle adjustment component is connected between the bottom frame and the middle frame for adjusting and fixing the rotation angle of the middle frame relative to the bottom frame, and a second angle adjustment component is connected between the top frame and the middle frame for adjusting and fixing the rotation angle of the top frame relative to the middle frame. This technical solution, by adjusting the rotation angles of the middle and top frames using the first and second angle adjustment components, can change the height of the foldable dumbbell rack to meet the needs of different users.

[0012] In some embodiments, the first angle adjustment component includes:

[0013] A first adjustment seat is installed on the bottom frame and has a first angle adjustment plate extending upward from the bottom frame. The first angle adjustment plate is hinged to the end of the middle frame via a first hinge post, the axis of the first hinge post being perpendicular to the first angle adjustment plate. A plurality of first positioning holes are spaced apart on the first angle adjustment plate, and the intersection of the center lines of the plurality of first positioning holes and the surface of the first angle adjustment plate is located on the same first arc line with the intersection of the axis of the first hinge post and the surface of the first angle adjustment plate as the center, so that the plurality of first positioning holes correspond one-to-one with the plurality of rotation angles of the middle frame relative to the bottom frame.

[0014] The first pin is inserted into the first through hole in the middle frame. The axis of the first through hole is parallel to the axis of the first hinge post. The vertical distance between the axis of the first through hole and the axis of the first hinge post is equal to the radius of the first arc, so that after the middle frame is flipped relative to the bottom frame, the first pin is inserted into the first positioning hole corresponding to the flipping angle.

[0015] The second angle adjustment component includes:

[0016] The second adjustment seat is installed on the top frame and has a second angle adjustment plate extending downward from the top frame. The second angle adjustment plate is hinged to the end of the middle frame via a second hinge post, the axis of which is perpendicular to the second angle adjustment plate. The second angle adjustment plate is provided with a plurality of second positioning holes spaced apart. The intersection of the center line of the plurality of second positioning holes and the surface of the second angle adjustment plate is located on the same second arc line with the intersection of the axis of the second hinge post and the surface of the second angle adjustment plate as the center, so that the plurality of second positioning holes correspond one-to-one with the plurality of rotation angles of the top frame relative to the middle frame.

[0017] The second pin is inserted into the second through hole in the middle frame. The axis of the second through hole is parallel to the axis of the second hinge post. The vertical distance between the axis of the second through hole and the axis of the second hinge post is equal to the radius of the second arc, so that after the top frame is flipped relative to the middle frame, the second pin is inserted into the second positioning hole corresponding to the flipping angle.

[0018] This technical solution achieves the adjustment of the flipping angle of the middle frame and the top frame through the cooperation of the first angle adjustment plate and the first pin, as well as the cooperation of the second angle adjustment plate and the second pin.

[0019] In some embodiments, the bottom frame includes a U-shaped frame, the middle frame includes an H-shaped frame, and the two free ends of the H-shaped frame, located on the same side but not connected, are rotatably connected to the two free ends of the U-shaped frame, respectively. The top frame includes two support arms, each supporting a dumbbell with a tray, and the remaining two free ends of the H-shaped frame are rotatably connected to the two support arms, respectively. This technical solution uses a U-shaped frame as the bottom frame, an H-shaped frame as the middle frame, and support arms as the top frame, resulting in a simple overall structure for the dumbbell rack, facilitating manufacturing and assembly.

[0020] In some embodiments, the top surface of the top frame serves as the support surface. The top frame is rotatably connected to the middle frame via a rotating assembly. The top frame rotates relative to the middle frame about a rotation axis perpendicular to the support surface to adjust the dumbbell placement angle. This technical solution, through the rotating assembly, allows the top frame to rotate relative to the middle frame, achieving flexible adjustment of the dumbbell placement angle and meeting the needs of different users.

[0021] In some embodiments, the rotating assembly includes a first connecting plate, a second connecting plate, and a third connecting plate arranged sequentially along a rotation axis. The first connecting plate is fixedly connected to the top frame, the second connecting plate is connected to the middle frame, and the second connecting plate has a through hole in its center extending along the rotation axis. The third connecting plate is connected to the first connecting plate by a fastener passing through the through hole, allowing the second connecting plate to be rotatably clamped between the first and third connecting plates. A mating part is provided on the side of the first or third connecting plate facing the second connecting plate, and this mating part is fitted into the through hole, allowing for a rotatable engagement between the mating part and the second connecting plate. In this technical solution, the first, second, and third connecting plates are connected by fasteners, and the rotatable connection of the top frame relative to the middle frame is achieved through the rotatable engagement of the second connecting plate and the mating part.

[0022] In some embodiments, the wall of the through hole is wavy, extending circumferentially along the wall of the through hole. The mating part is provided with a ball bearing for contacting and engaging with the wavy surface. The ball bearing reciprocates radially along the through hole to pop out or retract relative to the mating part. The portion of the wavy surface that bulges towards the mating part is called a convex surface, and the portion that is recessed away from the mating part is called a concave surface. As the mating part and the second connecting plate rotate relative to each other, the ball bearing alternately contacts the concave and convex surfaces. When the ball bearing contacts the concave surface, it pops out relative to the mating part; when the ball bearing contacts the convex surface, it is compressed back into the mating part. This technical solution achieves rotation and self-locking between the mating part and the second connecting plate through the engagement of the ball bearing in the mating part with the concave and convex surfaces of the wavy surface.

[0023] In some embodiments, the clamping assembly includes a support member for supporting a dumbbell tray, the support member being disposed along the width direction of the dumbbell tray, and clamping members for clamping the two sides of the dumbbell tray in the width direction being disposed opposite each other at both ends of the support member. This technical solution, through the cooperation of the support member and the clamping members, can effectively support and clamp the dumbbell tray, ensuring the stable placement of the dumbbells on the dumbbell rack.

[0024] In some embodiments, two clamping members are slidably connected to the two ends of the support member, allowing the two clamping members to move relative to the support member along the width direction of the dumbbell tray to adjust the distance between the two clamping members; a locking member for locking the clamping members and the support member is detachably connected between the clamping members and the support member. This technical solution, through the sliding connection between the clamping members and the support member, allows the distance between the clamping members to be adjusted according to the width of the dumbbell tray, accommodating dumbbell trays of different sizes.

[0025] In some embodiments, the bottom of the frame is equipped with casters. This technical solution, through the use of casters, enables the dumbbell rack to move freely in its unfolded state.

[0026] Based on the above technical solution, the foldable dumbbell rack provided by this utility model achieves a simple and quick switch between folded and unfolded states by relatively flipping the bottom frame, middle frame, and top frame. In the unfolded state, it can be directly supported on the ground, requiring minimal space and meeting users' requirements for ease of use. In the folded state, the bottom frame, middle frame, and top frame are stacked from bottom to top, and dumbbells with trays can still be fixed to the top frame, allowing it to still be used for dumbbell storage in the folded state. Moreover, it stores dumbbells with trays, and dumbbells can also be stored using the dumbbell trays, allowing the foldable dumbbell rack to be placed separately after training, meeting users' space utilization needs when using the dumbbell rack for daily dumbbell storage. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 A perspective view of a foldable dumbbell rack in its unfolded state, according to an embodiment of the present invention;

[0029] Figure 2 A perspective view of a foldable dumbbell rack in a folded state, according to an embodiment of the present invention;

[0030] Figure 3 for Figure 1 A magnified view of a section at point A in the middle;

[0031] Figure 4 for Figure 1 A magnified view of a section at point B in the middle;

[0032] Figure 5 An exploded view of a foldable dumbbell rack provided in one embodiment of the present invention;

[0033] Figure 6 for Figure 5 A magnified view of a section at point C;

[0034] Figure 7 A schematic diagram of the assembly structure of the second connecting plate and the mating part in the rotating assembly of a foldable dumbbell rack according to an embodiment of the present invention;

[0035] Figure 8 for Figure 5 A magnified view of a section at point D.

[0036] In the picture:

[0037] 1. Bottom frame; 2. Middle frame; 3. Top frame; 4. Clamp assembly; 5. First angle adjustment assembly; 6. Second angle adjustment assembly; 7. Rotation assembly;

[0038] 31. Outrigger;

[0039] 41. Support component; 42. Clamping component; 43. Locking component;

[0040] 51. First adjusting seat; 511. First angle adjusting plate; 52. First hinge post; 53. First pin;

[0041] 61. Second adjusting seat; 611. Second angle adjusting plate; 62. Second hinge post; 63. Second pin;

[0042] 71. First connecting plate; 711. Mating part; 72. Second connecting plate; 73. Third connecting plate; 74. Fastener; 75. Ball; 751. Ball body; 752. Housing;

[0043] a. First positioning hole; b. Second positioning hole; c. Through hole; d. Wave-shaped surface; d1. Convex surface; d2. Concave surface; e. Oblong hole. Detailed Implementation

[0044] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0045] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] As attached Figure 1 and Figure 2 As shown in an illustrative embodiment of the foldable dumbbell rack of this utility model, the foldable dumbbell rack is used to hold dumbbells with trays, and includes a bottom frame 1, a top frame 3, and a middle frame 2; the bottom frame 1 is used to support the ground; the top frame 3 is used to support the dumbbells with trays, and is located above the bottom frame 1, with a clamping assembly 4 for holding the dumbbell tray on its top; one end of the middle frame 2 is rotatably connected to the bottom frame 1 so that the middle frame 2 flips upward relative to the bottom frame 1, and the other end is rotatably connected to... The top frame 3 is attached to the middle frame 2 so that the top frame 3 flips upward relative to the middle frame 2; wherein, in the folded state, the bottom frame 1, the middle frame 2, and the top frame 3 are stacked from bottom to top; in the unfolded state, the middle frame 2 flips upward relative to the bottom frame 1 so that the middle frame 2 is tilted relative to the bottom frame 1, and the top frame 3 flips upward relative to the middle frame 2 so that the middle frame 2 is tilted relative to the top frame 3, so as to open up the distance between the top frame 3 and the bottom frame 1 through the middle frame 2.

[0049] The working principle of the above-mentioned foldable dumbbell rack is as follows: When using it for training, the middle frame 2 is flipped upward relative to the bottom frame 1, so that the middle frame 2 is tilted relative to the bottom frame 1. Then, the top frame 3 is flipped upward relative to the middle frame 2, so that the middle frame 2 is also tilted relative to the top frame 3. Thus, by opening up the distance between the top frame 3 and the bottom frame 1 through the middle frame 2, the foldable dumbbell rack can be in the unfolded state. When the foldable dumbbell rack is in the unfolded state, it can be placed directly on the ground. Then, the dumbbells with trays are placed on the top frame 3, and the dumbbell trays are clamped by the clamping assembly 4 to fix the dumbbells, making it easy to take the dumbbells out during training. After training, remove the dumbbells with trays from the top frame 3. Flip the top frame 3 downwards relative to the middle frame 2, and then flip the middle frame 2 downwards relative to the bottom frame 1. This will restore the foldable dumbbell rack to its folded state. At this point, the dumbbells with trays can be reattached to the top frame 3, allowing the foldable dumbbell rack and dumbbells to be placed horizontally together in a small storage space (such as in a cabinet or under a bed). Alternatively, the dumbbells can be placed separately without reattaching them. When placed separately, the foldable dumbbell rack can be placed horizontally or vertically. When placed vertically, it can be placed in a narrow vertical space (such as the gap between a bed or cabinet and a wall). The dumbbells with trays are stored in the dumbbell trays in a smaller storage space. It should be noted that... Figure 1 and Figure 2 Dumbbells with trays are not shown in the diagram. Dumbbells with trays are existing technology in this field. For reference, please refer to the novel dumbbell assembly disclosed in patent CN106693278A, where the base is the dumbbell tray. Those skilled in the art can know how to clamp the dumbbell tray onto the clamp assembly 4 based on common knowledge.

[0050] The aforementioned foldable dumbbell rack allows for a simple and quick switch between folded and unfolded states by rotating the bottom frame 1, middle frame 2, and top frame 3. In the unfolded state, it can be directly supported on the ground, requiring minimal space and meeting users' needs for ease of use. In the folded state, the bottom frame 1, middle frame 2, and top frame 3 are stacked from bottom to top, and dumbbells with trays can still be fixed to the top frame 3, allowing it to still be used for dumbbell storage even when folded. The dumbbells stored are those with trays, and the dumbbells can also be stored using the trays. This allows the foldable dumbbell rack to be stored separately after training, meeting users' space utilization needs when storing dumbbells on a daily basis.

[0051] like Figure 1 , Figure 3 and Figure 4As shown, a first angle adjustment component 5 is connected between the bottom frame 1 and the middle frame 2 to adjust and fix the rotation angle of the middle frame 2 relative to the bottom frame 1. A second angle adjustment component 6 is connected between the top frame 3 and the middle frame 2 to adjust and fix the rotation angle of the top frame 3 relative to the middle frame 2. A suitable dumbbell rack height can prevent users from bending over to pick up dumbbells and causing lower back injury. In this embodiment, by adjusting the rotation angle of the middle frame 2 and the top frame 3 using the first angle adjustment component 5 and the second angle adjustment component 6, the height of the foldable dumbbell rack can be changed to meet the needs of different users.

[0052] Specifically, such as Figure 3 As shown, the first angle adjustment assembly 5 includes a first adjustment seat 51 and a first pin 53; the first adjustment seat 51 is installed on the bottom frame 1 and has a first angle adjustment plate 511 extending upward from the bottom frame 1; the first angle adjustment plate 511 is hinged to the end of the middle frame 2 through a first hinge post 52, and the axis of the first hinge post 52 is perpendicular to the first angle adjustment plate 511; a plurality of first positioning holes a are spaced apart on the first angle adjustment plate 511, and the intersection of the center line of the plurality of first positioning holes a with the plate surface of the first angle adjustment plate 511 is located at the intersection of the axis of the first hinge post 52 and the plate surface of the first angle adjustment plate 511. Along the same first arc, the bending direction of the first arc is the same as the rotation direction of the middle frame 2 relative to the bottom frame 1, so that the multiple first positioning holes a correspond one-to-one with the multiple rotation angles of the middle frame 2 relative to the bottom frame 1; the first pin 53 passes through the first through hole c opened in the middle frame 2, the axis of the first through hole c is set parallel to the axis of the first hinge post 52, and the vertical distance between the axis of the first through hole c and the axis of the first hinge post 52 is equal to the radius of the first arc, so that after the middle frame 2 is rotated relative to the bottom frame 1, the first pin 53 is inserted into the first positioning hole a corresponding to the rotation angle. Through the cooperation of the first angle adjustment plate 511 and the first pin 53, the middle frame 2 can be fixed at different rotation angles, realizing the adjustment of the rotation angle of the middle frame 2, and the adjustment operation is convenient, which can quickly adjust the dumbbell rack to the required use state, improving the adjustment efficiency and reliability. Preferably, the multiple first positioning holes a are evenly distributed along the first arc to achieve uniform rotation angle adjustment.

[0053] Specifically, such as Figures 4-6As shown, the second angle adjustment assembly 6 includes a second adjustment seat 61 and a second pin 63; the second adjustment seat 61 is mounted on the top frame 3 and has a second angle adjustment plate 611 extending downward from the top frame 3; the second angle adjustment plate 611 is hinged to the end of the middle frame 2 via a second hinge post 62, the axis of the second hinge post 62 being perpendicular to the second angle adjustment plate 611; a plurality of second positioning holes b are spaced apart on the second angle adjustment plate 611, and the intersection of the center line of the plurality of second positioning holes b with the surface of the second angle adjustment plate 611 is located at a point centered on the intersection of the axis of the second hinge post 62 and the surface of the second angle adjustment plate 611. Along the same second arc, the bending direction of the second arc is the same as the rotation direction of the top frame 3 relative to the middle frame 2, so that the multiple second positioning holes b correspond one-to-one with the multiple rotation angles of the top frame 3 relative to the middle frame 2; the second pin 63 passes through the second through hole c opened in the middle frame 2, the axis of the second through hole c is parallel to the axis of the second hinge post 62, and the vertical distance between the axis of the second through hole c and the axis of the second hinge post 62 is equal to the radius of the second arc, so that after the top frame 3 rotates relative to the middle frame 2, the second pin 63 is inserted into the second positioning hole b corresponding to the rotation angle. Through the cooperation of the second angle adjustment plate 611 and the second pin 63, the top frame 3 can be fixed at different rotation angles, realizing the adjustment of the rotation angle of the top frame 3, and the adjustment operation is convenient, which can quickly adjust the dumbbell rack to the required use state, improving the adjustment efficiency and reliability. Preferably, the multiple second positioning holes b are evenly distributed along the second arc to achieve uniform rotation angle adjustment.

[0054] like Figure 1 As shown, the bottom frame 1 includes a U-shaped frame, the middle frame 2 includes an H-shaped frame, and the two free ends of the H-shaped frame, located on the same side but not connected, are rotatably connected to the two free ends of the U-shaped frame. The top frame 3 includes two support arms 31, each supporting a dumbbell with a tray. The remaining two free ends of the H-shaped frame are rotatably connected to the two support arms 31. This structural design, using a U-shaped frame as the bottom frame 1, an H-shaped frame as the middle frame 2, and support arms 31 as the top frame 3, simplifies the overall structure of the dumbbell rack, making it easy to manufacture and assemble. It should be noted that each of the two free ends of the U-shaped frame is equipped with a set of first angle adjustment components 5, which are hinged to the two free ends of the H-shaped frame; each support arm 31 is equipped with a set of second angle adjustment components 6, which are hinged to the free ends of the H-shaped frame.

[0055] like Figure 1As shown, the top surface of the top frame 3 serves as the supporting surface. The top frame 3 is rotatably connected to the middle frame 2 via a rotating assembly 7. The top frame 3 rotates 360° relative to the middle frame 2 about a rotation axis perpendicular to the supporting surface to adjust the dumbbell placement angle. A suitable dumbbell placement angle allows users to exert force more comfortably in their hands and arms and reduces the risk of injury. In this embodiment, the rotating assembly 7 allows the top frame 3 to rotate 360° relative to the middle frame 2, enabling flexible adjustment of the dumbbell placement angle. This allows the dumbbell placement angle to be adjusted to the optimal angle for picking up dumbbells according to different user body types and usage habits, thus meeting the needs of different users.

[0056] like Figure 5 and Figure 6 As shown, the rotating assembly 7 includes a first connecting plate 71, a second connecting plate 72, and a third connecting plate 72 arranged sequentially along the rotation axis. The first connecting plate 71 is fixedly connected to the top frame 3, and the second connecting plate 72 is connected to the middle frame 2. A through hole c is provided in the middle of the second connecting plate 72 along the rotation axis. The third connecting plate 72 is connected to the first connecting plate 71 by a fastener 74 passing through the through hole c, so that the second connecting plate 72 is rotatably clamped between the first connecting plate 71 and the third connecting plate 72. A mating part 711 is provided on the side of the first connecting plate 71 facing the second connecting plate 72. The mating part 711 is sleeved in the through hole c, so that the mating part 711 and the second connecting plate 72 are rotatably engaged. The rotating assembly 7 described above, with its first connecting plate 71, second connecting plate 72, and third connecting plate 72 connected by fasteners 74, achieves a rotatable connection between the top frame 3 and the middle frame 2 through the rotational engagement of the second connecting plate 72 and the mating part 711. This structural design is simple and compact, ensuring the stability of the rotation of the top frame 3 while facilitating installation. It is understood that the mating part 711 can also be located on the third connecting plate 72. Specifically, in this embodiment, the first connecting plate 71 is fixedly connected to the bottom of the support arm 31, and the second connecting plate 72 is fixedly connected to the second adjusting seat 61, so as to connect to the middle frame 2 through the second connecting seat.

[0057] like Figures 5-7As shown, the wall of the through hole c is a wave-shaped surface d, which extends circumferentially along the wall of the through hole c. The mating part 711 is provided with a ball 75 for contacting and engaging with the wave-shaped surface d. The ball 75 reciprocates radially along the through hole c to pop out or retract relative to the mating part 711. The part of the wave-shaped surface d that protrudes towards the mating part 711 is called the convex surface d1, and the part that is recessed away from the mating part 711 is called the concave surface d2. As the mating part 711 and the second connecting plate 72 rotate relative to each other, the ball 75 alternately contacts the concave surface d2 and the convex surface d1. When the ball 75 contacts the concave surface d2, the ball 75 pops out relative to the mating part 711 to lock the mating part 711 and the second connecting plate 72, so that the top frame 3 is fixed at the required angle. When the ball 75 contacts the convex surface d1, the ball 75 is compressed back into the mating part 711 to realize the relative rotation of the mating part 711 and the second connecting plate 72. The engagement of the ball 75 in the mating part 711 with the concave surface d2 and convex surface d1 of the wave surface d enables the rotation and self-locking of the mating part 711 and the second connecting plate 72. It should be noted that the ball 75 is prior art, comprising a housing 752 with an open end along the axial direction, a ball 751 housed within the housing 752, and a compression spring installed between the housing 752 and the ball 751. The diameter of the opening at the end of the housing 752 is smaller than the diameter of the ball 751. The compression spring presses the ball 751 against the opening at the end of the housing 752. When the ball 751 is compressed, the compression spring contracts to retract into the housing 752. When the pressure decreases or is removed, the compression spring automatically extends to allow the ball 751 to press back against the opening at the end of the housing 752. It should also be noted that, to ensure the stability of the rotational engagement between the mating part 711 and the second connecting plate 72, such as... Figure 7 As shown, the mating part 711 is preferably cylindrical, and there are two balls 75, which are symmetrically arranged at both ends of the radial direction of the mating part 711.

[0058] like Figure 5 and Figure 8 As shown, the clamping assembly 4 includes a support member 41 for supporting the dumbbell tray. The support member 41 is arranged along the width direction of the dumbbell tray, and clamping members 42 are arranged opposite each other at both ends of the support member 41 for clamping the two sides of the dumbbell tray in the width direction. Through the cooperation of the support member 41 and the clamping members 42, the dumbbell tray can be effectively supported and clamped to ensure the stable placement of the dumbbells on the dumbbell rack. It should be noted that, in order to ensure the stability of clamping, it is preferable to provide two sets of clamping assemblies 4 for one dumbbell tray, so as to clamp the two ends of the dumbbell tray in the length direction respectively.

[0059] like Figure 8As shown, two clamping members 42 are slidably connected to the two ends of the support member 41, allowing the two clamping members 42 to move relative to the support member 41 along the width direction of the dumbbell tray to adjust the distance between the two clamping members 42; a locking member 43 for locking the clamping members 42 and the support member 41 is detachably connected between the clamping members 42 and the support member 41. This configuration allows the distance between the clamping members 42 to be adjusted according to the width of the dumbbell tray, accommodating dumbbell trays of different sizes and improving the versatility and applicability of the dumbbell rack. Specifically, in this embodiment, the locking member 43 is a locking screw, and the support member 41 has an elongated hole e along the width direction of the dumbbell tray. The locking screw passes through the elongated hole e and is threadedly connected to the clamping member 42. When it is necessary to adjust the distance between the clamping members 42, loosening the locking screw can release the locking of the clamping member 42 and the support member 41. At this time, the clamping member 42 can be moved, and the clamping member 42 drives the locking screw to move along the elongated hole e, thereby changing the distance between the two clamping members 42. After the dumbbell tray is placed between the two clamping members 42, the clamping member 42 is moved in the direction of clamping the dumbbell tray. After the clamping member 42 is close to the dumbbell tray, the clamping member 42 and the support member 41 can be locked by tightening the locking screw.

[0060] In addition, to facilitate the movement of the dumbbell rack in its unfolded state, preferably, the bottom of the bottom frame 1 is equipped with casters.

[0061] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A foldable dumbbell rack for holding dumbbells with a tray, characterized in that, include: The bottom frame is used to support the ground; A top frame for supporting dumbbells with trays is located above the bottom frame and has a clamping assembly at its top for holding the dumbbell trays. A middle frame, one end of which is rotatably connected to the bottom frame so that the middle frame can be flipped upward relative to the bottom frame, and the other end of which is rotatably connected to the top frame so that the top frame can be flipped upward relative to the middle frame; In the folded state, the bottom frame, the middle frame, and the top frame are stacked from bottom to top. In the unfolded state, the middle frame flips upward relative to the bottom frame until it is tilted relative to the bottom frame, and the top frame flips upward relative to the middle frame until it is tilted relative to the top frame, so as to widen the distance between the top frame and the bottom frame through the middle frame.

2. The foldable dumbbell rack according to claim 1, characterized in that, A first angle adjustment component is connected between the bottom frame and the middle frame for adjusting and fixing the rotation angle of the middle frame relative to the bottom frame, and a second angle adjustment component is connected between the top frame and the middle frame for adjusting and fixing the rotation angle of the top frame relative to the middle frame.

3. The foldable dumbbell rack according to claim 2, characterized in that, The first angle adjustment component includes: A first adjustment seat is installed on the bottom frame and has a first angle adjustment plate extending upward from the bottom frame. The first angle adjustment plate is hinged to the end of the middle frame via a first hinge post, the axis of the first hinge post being perpendicular to the first angle adjustment plate. A plurality of first positioning holes are spaced apart on the first angle adjustment plate, and the intersection of the center lines of the plurality of first positioning holes and the surface of the first angle adjustment plate is located on the same first arc line with the intersection of the axis of the first hinge post and the surface of the first angle adjustment plate as the center, so that the plurality of first positioning holes correspond one-to-one with the plurality of rotation angles of the middle frame relative to the bottom frame. The first pin is inserted into the first through hole of the middle frame. The axis of the first through hole is parallel to the axis of the first hinge post. The vertical distance between the axis of the first through hole and the axis of the first hinge post is equal to the radius of the first arc. This allows the first pin to be inserted into the first positioning hole corresponding to the flip angle after the middle frame is flipped relative to the bottom frame. The second angle adjustment component includes: A second adjustment seat is installed on the top frame and has a second angle adjustment plate extending downward from the top frame. The second angle adjustment plate is hinged to the end of the middle frame via a second hinge post, the axis of which is perpendicular to the second angle adjustment plate. The second angle adjustment plate is provided with a plurality of second positioning holes spaced apart. The intersection of the center lines of the plurality of second positioning holes and the surface of the second angle adjustment plate is located on the same second arc line centered at the intersection of the axis of the second hinge post and the surface of the second angle adjustment plate, so that the plurality of second positioning holes correspond one-to-one with the plurality of rotation angles of the top frame relative to the middle frame. The second pin is inserted into the second through hole in the middle frame. The axis of the second through hole is parallel to the axis of the second hinge post. The vertical distance between the axis of the second through hole and the axis of the second hinge post is equal to the radius of the second arc. This allows the second pin to be inserted into the second positioning hole corresponding to the flip angle after the top frame is flipped relative to the middle frame.

4. The foldable dumbbell rack according to any one of claims 1-3, characterized in that, The bottom frame includes a U-shaped frame, the middle frame includes an H-shaped frame, and the two free ends of the H-shaped frame located on the same side but not connected are respectively rotatably connected to the two free ends of the U-shaped frame; the top frame includes two support arms, the two support arms are respectively used to support the two dumbbells with trays, and the remaining two free ends of the H-shaped frame are respectively rotatably connected to the two support arms.

5. The foldable dumbbell rack according to claim 1, characterized in that, Using the top surface of the top frame as a support surface, the top frame is rotatably connected to the middle frame via a rotating assembly. The top frame rotates relative to the middle frame about a rotation axis perpendicular to the support surface to adjust the placement angle of the dumbbell.

6. The foldable dumbbell rack according to claim 5, characterized in that, The rotating assembly includes a first connecting plate, a second connecting plate, and a third connecting plate arranged sequentially along the rotation axis. The first connecting plate is fixedly connected to the top frame, and the second connecting plate is connected to the middle frame. A through hole is formed in the middle of the second connecting plate, extending through the second connecting plate along the rotation axis. The third connecting plate is connected to the first connecting plate by a fastener passing through the through hole, so that the second connecting plate is rotatably clamped between the first and third connecting plates. A mating part is provided on the side of the first or third connecting plate facing the second connecting plate. The mating part is fitted into the through hole so that the mating part rotates with the second connecting plate.

7. The foldable dumbbell rack according to claim 6, characterized in that, The wall of the through hole is wavy, and the wavy surface extends circumferentially along the wall of the through hole. The mating part is provided with a ball for contacting and engaging with the wavy surface. The ball reciprocates radially along the through hole to pop out or retract relative to the mating part. The portion of the wavy surface that protrudes towards the mating part is a convex surface, and the portion that is recessed away from the mating part is a concave surface. As the mating part and the second connecting plate rotate relative to each other, the ball alternately contacts the concave and convex surfaces. When the ball contacts the concave surface, the ball pops out relative to the mating part. When the ball contacts the convex surface, the ball is compressed back into the mating part.

8. The foldable dumbbell rack according to claim 1, characterized in that, The clamping assembly includes a support member for supporting the dumbbell tray, the support member being arranged along the width direction of the dumbbell tray, and clamping members for clamping the two sides of the dumbbell tray in the width direction being arranged opposite to each other at both ends of the support member.

9. The foldable dumbbell rack according to claim 8, characterized in that, The two clamping members are slidably connected to the two ends of the support member, so that the two clamping members can move relative to the support member along the width direction of the dumbbell tray to adjust the distance between the two clamping members; a locking member for locking the clamping members and the support member is detachably connected between the clamping members and the support member.

10. The foldable dumbbell rack according to claim 1, characterized in that, The bottom of the frame is equipped with casters.

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