Description:FIELD

The present disclosure relates to a rack assembly designed for handling and transporting loads of varying sizes and dimensions. More particularly, said rack assembly of the present disclosure is designed with an adaptable structure to accommodate various load configurations. The rack assembly of the present disclosure is foldable for easy storage and transport and includes integrated wheels for smooth movement and repositioning.

BACKGROUND

In response to this growing demand, a need has arisen for a versatile rack assembly having capabilities including expandable, foldable and movable to accommodate varying load sizes efficiently. Traditional industrial apparatuses are commonly used for inventory management and goods retrieval, however, they often lack the flexibility to adapt to different sizes of loads/payloads.

Existing solutions fail to provide an assembly having expandable, foldable and movable capabilities. To address this problem, multiple rack(s) can be constructed as per the different sizes of the loads. However, such customized assemblies are not foldable and expandable in nature and are limited to store load(s) with fixed dimensions of designed structure.

Typically, to handle and carry loads of varying sizes require rack assembly matching the size of such load(s), there is a still need for a foldable, expandable and movable rack assembly which addresses all the above-mentioned limitations, and which offers a simple solution which can be adjustable and expandable as per the user’s requirement.

The present disclosure overcomes this limitation by providing a rack assembly that is capable of dynamically contracting and expanding, thereby facilitating the handling and transportation of loads of varying sizes and dimensions.

OBJECTS

One of the objects of the present disclosure is to provide a rack assembly for handling and transporting the loads of varying size and dimensions.

Another object of the present disclosure is to provide a rack assembly which is expandable and foldable as per a user’s requirement to handle and transport loads of varying size and dimensions.

Another object of the present disclosure is to provide a rack assembly which is movable.

Yet another object of the present disclosure is to provide a rack assembly which may be contract or expand as per the size and dimension of one or more load(s).

Yet another object of the present disclosure is to provide a rack assembly which is easy to manufacture, install and use.

Still another object of the present disclosure is to provide a rack assembly which has low maintenance and longer life.

These and other objects of the present invention will become readily apparent upon further review of the following description and accompanying drawings.

SUMMARY

The present disclosure relates to a rack assembly designed to handle and transport loads of varying sizes and dimensions, the rack assembly comprising: one or more vertical members each having a top section and a bottom section defining a length; one or more top support members and one or more bottom support members each having two ends defining a length; one or more extended mounting plates of the top support members and the bottom support members connected to the vertical members; one or more crossbar assemblies having an upper end and a lower end defining a length; a set of at least four wheel assemblies connected to the bottom section of the vertical members through one or more wheel mounting plates; wherein the upper end of the crossbar assembly including one or more sliding member configured to be slidably movable on the vertical members; wherein the lower end of the crossbar assembly connected to the bottom section of the vertical members above the wheel assemblies through one or more fastening means. The rack assembly is expandable, foldable and movable.

The vertical members include a front side, a back side, a left side and a right side. The front side, the left side and the right side of the vertical members define a plurality of locking holes.

The extended mounting plate comprises a plurality of protrusions and/or a plurality of grooves.

The top support members and the bottom support members are connected to the vertical members by joining the protrusions of the extended mounting plates connected with the locking holes of the vertical members.

The top support members and the bottom support members are connected to the vertical members using a plurality of fastening means connecting the grooves of the extended mounting plates and the locking holes of the vertical members.

The back side of the vertical members includes one or more sliding channels; wherein the sliding member is slidably arranged over the sliding channel of the vertical members.

The sliding member includes a locking pin to adjust and to fix the length of the crossbar assembly. The crossbar assembly comprises at least two crossbar beams each having a proximal end and a distal end connected to each other through one or more fastening means.

The distal end of the crossbar beams is connected to the sliding member through the fastening means. The proximal end of the crossbar beams is connected at the bottom section of the vertical members through the fastening means.

The wheel mounting plates comprise a top portion and a bottom portion; wherein the top portion is connected to the vertical members and the bottom portion is connected to the wheel assemblies by one or more fastening means.

The wheel assemblies include one or more swivel rings, and one or more swivel wheels housed in wheel housing connected through an axle nut. The wheel assemblies include a braking mechanism comprising a brake pedal, a brake pad mount, and a brake pad to control the movement of the rack assembly.

The wheel assemblies include a locking member connected to a locking member housing to restrict the rotational movement of the wheel.

The sliding member comprising an anti-collapse attachment to prevent unintended folding or collapse during use.

The rack assembly is made of a high-strength metal or a composite material to ensure durability and load-bearing capacity.

The fastening means used in the rack assembly may include nuts, washers, rivets, screws, bolts.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The foregoing and other objects, features, and advantages of the present disclosure will be apparent from the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals refer to like parts throughout, wherein:

Fig. 1 illustrates a perspective view of a rack assembly according to the present disclosure;

Figs. 2A-2B illustrate partial views of the rack assembly showing locking arrangements of components thereof with one another according to the present disclosure;

Figs. 3A-3C illustrate partial views of the rack assembly showing locking arrangements of components thereof with one another to adjust height of the rack assembly according to the present disclosure;

Figs. 4A-4B illustrates a partial view of the rack assembly having a cross bar assembly to adjust the width of the rack assembly according to the present disclosure;

Figs. 5A-5B illustrate a perspective view and side view of a wheel assembly optimally attached to the rack assembly according to the present disclosure;

Figs. 6A-6B illustrate a perspective view and side view of a wheel assembly optimally attached to the rack assembly according to the present disclosure;

Figs. 7A-7B illustrates a perspective view and side view of a sliding channel and a sliding member slidable attached thereof in the rack assembly according to the present disclosure;

Figs. 8A-8B illustrates a side view and a top view of the sliding member and crossbar assembly according to the present disclosure;

Figs. 9A and 9C illustrates a perspective view and side view of the rack assembly in contracted position according to the present disclosure;

Figs. 9B and 9D illustrates a perspective view and side view of the rack assembly in expanded position according to the present disclosure;

DETAILED DESCRIPTION

Embodiments and/or examples of the present disclosure will now be described in detail with reference to the drawings wherein, like reference numerals designate identical or corresponding elements. In the drawings and in the description, the term "proximal", "bottom", "down" or "lower" or “rear” refers to a location on the device that is closest to a user using the apparatus. Conversely, the term "distal", "top", "up" or "upper" refers to a location on the device that is farthest from the user.

As used herein, the terms first, second, third, etc. are understood to describe different structures/elements so as to distinguish one from another. However, the terms are not structurally limiting unless the context indicates otherwise.

Moreover, the Figures may show simplified or partial views, and the dimensions of elements in the Figures may be exaggerated or otherwise not in proportion for clarity. In addition, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a terminal includes reference to one or more terminals. In addition, where reference is made to a list of elements (e.g., elements a, b, c), such reference is intended to include any one of the listed elements by itself, any combination of less than all of the listed elements, and/or a combination of all of the listed elements.

Further, for purposes of the description hereinafter, the terms “upper”, “lower”, “right”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “lateral”, “longitudinal”, and derivatives thereof shall relate to the disclosure as it is oriented in the drawing figures. However, it is to be understood that the disclosure may assume various alternative variations, except where expressly specified to the contrary. It is also to be understood that the specific devices illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments and/or examples of the disclosure. Hence, specific dimensions and other physical characteristics related to the embodiments and/or examples disclosed herein are not to be considered as limiting.

As used herein, the term “load” refers to including, but is not limited to, payloads, cargo, inventory, and similar items, which may be applicable in industrial, commercial, or logistical environments.

In some examples, the term fastening means used herein including, but not being limited to nuts, washers, rivets, screws, bolts used to connect and join the two or more components.

Referring to Figs. 1, the present disclosure provides a rack assembly 10 designed for handling and transporting loads of varying sizes and dimensions and as per a user’s requirements, said rack assembly 10 comprising: one or more vertical members 12a, 12b, 12c, 12d having a body comprises at least four sides i.e., front side, back side, left side and right side, wherein the front side, left side and right side having a locking holes 24a and whereas the back side having one or more sliding channels 24b; one or more top support members 14a, 14b and one or more bottom support members 16a, 16b each having two ends defining a length and one or more extended mounting plates 14, 16 having a plurality of protrusions 21 and/or grooves 23 connected to the top support members 14a, 14b, the bottom support members 16a, 16b and the vertical members 12a, 12b, 12c, 12d; the top support member 14a is connected to the vertical member 12b and 12d; the top support member 14b is connected to the vertical member 12a and 12c; similarly, the bottom support member 16a is connected to the vertical member 12b and 12d; the bottom support member 16b is connected to the vertical member 12a and 12c; a set of at least four wheel assembly 30a, 30b, 30c, 30d connected to the bottom section of the vertical members 12a, 12b, 12c, 12d through one or more wheel mounting plates 18a, 18b, 18c, 18d; one or more crossbar assemblies 20a, 20b having an upper end and a lower end defining a length; the upper end of the cross bar assembly 20a, 20b including one or more sliding members 26a, 26b, 26c, 26d configured to be slidably movable over the sliding channel 24b located at back side of the vertical members 12a, 12b, 12c, 12d; the lower end of the cross bar assembly 20a, 20b connected to the bottom section of the vertical members 12a, 12b, 12c, 12d above the wheel assembly 30a, 30b, 30c, 30d through one or more fastening means 35b.

Referring now to Figs. 2A and 2B, a partial view of the rack assembly 10 showing arrangement of the top support member 14a, 14b, the bottom support member 16a, 16b as well as the crossbar assembly 20a with the vertical members 12a, 12b. The height of the rack assembly can be adjusted by moving top support members 14a, 14b and the bottom support members 16a, 16b over the vertical members 12a, 12b; the wheel assembly 30a, 30b, may include a braking mechanism with a brake pedal 32 configured to control the movement of the rack assembly 10. The front side, the left side and the right side of the vertical members 12a, 12b, defines a plurality of locking holes 24a; the back side of the vertical members 12a, 12b defines one or more sliding channel 24b the height and the width of the rack assembly 10 may be adjusted as per the dimensions of the load(s) as per the user’s requirement.

In some examples, the top support members (14a, 14b) and the bottom support members (16a, 16b) are connected to the vertical members (12a, 12b, 12c, 12d) by affixing the protrusions (21) of the extended mounting plates (14, 16) with the locking holes (24a) of the vertical members (12a, 12b, 12c, 12d).

In some examples, the top support members (14a, 14b) and the bottom support members (16a, 16b) are connected to the vertical members (12a, 12b, 12c, 12d) using a plurality of fastening means (35a) between the grooves (23) of the extended mounting plates (14, 16) and the locking holes (24a) of the vertical members (12a, 12b, 12c, 12d).

Referring to Figs. 3A, 3B and 3C, illustrates a partial lateral view of the rack assembly 10 having a height and a width, showing arrangement of the top support member 14b and the bottom support member 16b with the vertical members 12a, 12c through extended mounting plate 14 and/or 16.

In some examples, the top support member 14b is connected to the vertical members 12a, 12c above the bottom support member 16b at a height which may be further increased or decreased to accommodate loads of varying sizes and dimensions and is foldable to enable compact and efficient transportation.

In some examples, the top support members 14b or the bottom support member 16b may be disengaged to accommodate the dimensions of a particular load and facilitate ease of placement, stability, or structural adjustments as per the user’s requirements.

Referring to Figs. 4A and 4B, illustrates a partial lateral view of the rack assembly 10 showing arrangement of the crossbar assembly 20a; the crossbar assembly 20a comprises at least two crossbar beams 34a and 34b; the crossbar beam 34a has a has a proximal end 15a and a distal end 17a; similarly, the cross beam 34b has a has a proximal end 15b and a distal end 17b; the crossbar beams 34a, 34b connected to each other through a fastening means 35c.

In some examples, the crossbar beams 34a, 34b includes one or more sliding extension member 38a, 38b capable of extending the length of the crossbar assembly 20a as per the dimensions and size of the load(s).

The proximal ends 15a, 15b of the cross bar beam 34a and 34b are connected to the bottom section of the vertical members 12a, 12b through the fastening means 35b; the distal end 17a, 17b of the crossbar beams 34a, 34b is connected to the sliding member 26a through the fastening means 35e; the width of the rack assembly 10 may be adjusted as per the dimensions of the load(s) using sliding mechanism as stated.

Referring now to Figs. 5A and 5B in view of Fig. 1, illustrates a perspective and a lateral side view of the wheel assembly 30c beneath the rack assembly to enable the rack assembly 10 to be maneuvered easily; the wheel assembly 30c connected to the bottom of the one or more vertical member 12c through the wheel mounting plate 18c respectively. The wheel mounting plate 18c has a top portion and a bottom portion, wherein the top portion of the mounting plate 18c is connected to the vertical member 12c and the bottom portion of the mounting plate 18c is connected to the wheel assembly 30c through fastening means 35d. The wheel assembly 30c comprising a swivel ring 50, a wheel housing 42 which houses a swivel wheel 40 using an axle nut 44 connected between the wheel housing 42 and the swivel wheel 40 for movement of the rack assembly 10. The wheel assembly 30c may include a braking mechanism having a brake pedal 32 configured to control the movement of the rack assembly 10; a brake pad mount 46 and a brake pad 48. The brake pedal 32 is the means for the user to activate the brake when desiring to slow down or stop the rack assembly 10.

In some examples, the swivel ring 50 as shown in Fig. 5B configured to maneuver and to rotate the wheel assembly 30c in 360 degrees directions; the swivel wheel 40 designed to move the rack assembly in the desired direction.

Referring to Fig. 5B illustrates the non-activated configuration of the braking mechanism including a brake pedal 32, a brake pad mount 46 and a brake pad 48; the brake pedal 32 is connected to the brake pad mount 46 using a spring 33 and a spring bolt 31 as shown in Fig. 5A. The user needs to press the brake pedal 32 to activate the brake when needed. After use, the brake pedal 32 must be released, allowing it to return to its initial position and keeping the mechanism in a non-activated configuration.

Referring to Fig. 6A and 6B further illustrates the wheel assembly 30c of the rack assembly 10. The wheel assembly 30c includes a locking member housing 52 attached to the swivel ring 50 and a locking member 54 to connect with the locking member housing 52 to restrict the rotational movement of the swivel ring 50 and the swivel wheel 40. In some examples, the locking member 54 is designed to restrict the wheel's movement in a specific direction.

Referring to Figs. 7A-7B illustrate a perspective view and side view of the sliding member 26b which is slidably arranged over the sliding channel 24b located back side of the vertical member 12b. The sliding member 26b is connected to the distal ends 17a of the crossbar beams 34a through one or more fastening means 35e. The sliding member 26b comprises a locking pin 64 and an anti-collapse attachment 62 as shown in Fig. 7B.

Referring to Figs. 8A further illustrates the lateral view of the sliding member 26b connected to the crossbar beams 34a through one or more fastening means 35e; the sliding member 26b includes a locking pin 64 to adjust and fix the length of the crossbar assembly 20a and an anti-collapse attachment 62 to prevent unintended folding or collapse during use. The sliding member 26b is in the resting configuration comprises a handle 60, a spring lever 66 as shown in Fig. 8A. The user needs to push the spring lever 66 while firmly holding the handle 60 to initiate the movement of the sliding member 26b. By applying pressure to the spring lever 66 in outward direction, the pin 64 got disengaged from the locking holes 24a of the vertical member 12b so that the sliding member 26b may be guided downward or upward along the sliding channel 24b in a controlled manner as shown in Fig. 7A. This mechanism ensures smooth and precise operation, allowing the sliding member 26b to move securely within the designated path over the sliding channel 24b in order to adjust the width of the rack assembly 10 as further illustrated in Fig. 9A-9D.

In some examples, the anti-collapse attachment 62 may move downward, as shown in Figs. 7B and 8A, to restrict the movement of the spring lever 66 and ensure that the sliding mechanism is affixed to the vertical member 12b. In contrast, when the anti-collapse attachment 62 moves upward, it allows the spring lever 66 and sliding mechanism to move, enabling adjustments to the width of the rack assembly 10. Once desired width is achieved, the anti-collapse attachment 62 is moved downward to safeguard any further slider movement as shown Fig. 8A of the present disclosure.

Referring to Fig. 8B in conjunction with Fig. 8A, which further illustrates a top view of the locking mechanism of the sliding member 26b within the locking holes 24a of the vertical member 12b.

In some examples, locking pin 64 may be replaced with one or more electromechanical actuators such as hydraulic or pneumatic actuators, for moving the sliding mechanism without a manual force.

In some examples, a switch for activation and/or deactivation of the electromechanical actuators can be connected to the locking pin 64, such that when the locking pin 64 is released, the electromechanical actuators are activated and, when the locking pin 64 is locked to the corresponding mating means, the electromechanical actuators are deactivated.

In some examples, the locking pin 64 as well as the electromechanical actuators are automated by any conventional microprocessor-based means, for enabling a vehicle driver to move the wheel assembly 30a, 30b, 30c, 30d by operating a switch provided at the driver’s cabin.

Referring to Figs. 9A-9D which illustrates the working mechanism of the rack assembly 10. Fig. 9A-9B describes a perspective view of the rack assembly 10 in contracted state and expanded state. Fig. 9C-9D describes a front view of the rack assembly 10 in contracted state and expanded state.

Referring to Figs. 9C-9D illustrates a partial view of the rack assembly 10 and the working mechanism of the crossbar assembly 20a. The sliding members 26a and 26b may slide downward or upward direction to further contract and expand the crossbar beams 34a, 34b. During the expansion of the rack assembly 10, crossbar beams 34a, 34b extend and shift the wheel assembly 30a, 30b in outwards direction. Once the desired width of the rack assembly 10 is achieved, the sliding members 26a, 26b may be affixed using the locking pin 64, which engages with the locking holes 24a of the vertical members 12a, 12b.

In contrast, while contracting the expanded configuration, the crossbar beams 34a, 34b contracts and shifts the wheel assembly 30a, 30b in inwards direction. Once the desired width of the rack assembly 10 is achieved, the sliding members 26a, 26b may be affixed using the locking pin 64, which engages with the locking holes 24a of the vertical members 12a, 12b.

In some examples, the crossbar beams 34a. 34b comprises a sliding extension members 38a, 38b to further extend the width of the rack assembly 10. During the expansion of the rack assembly 10, the sliding extension members 38a, 38b may further extend the and increase the width of the rack assembly 10.

In some examples, the rack assembly is made of a high-strength metal or a composite material to ensure durability and load-bearing capacity.

Although this invention has been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the present invention extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the invention and obvious modifications and equivalents thereof. Thus, from the foregoing description, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the invention as set forth in the claims.

Accordingly, it is not intended that the scope of the foregoing description be limited to the exact description set forth above, but rather that such description be construed as encompassing such features that reside in the present invention, including all the features and embodiments that would be treated as equivalents thereof by those skilled in the relevant art. Thus, the scope of the present invention herein disclosed is not limited by the particular disclosed embodiments described above but determined only by a fair reading of the appended claims.
 
List of reference numerals
10 rack assembly
12a, 12b, 12c, 12d vertical members
14a, 14b top support members
14 extending mounting plate
16a, 16b bottom support members
16 extending mounting plate
15a proximal end of cross bar beam 1
15b proximal end of cross bar beam 2
17a distal end of cross bar beam 1
17b distal end of cross bar beam 2
18a, 18b, 18c, 18d wheel mounting plates
20a, 20b cross bar assemblies
21 protrusions
23 grooves
24a locking holes
24b sliding channels
26a, 26b, 26c, 26d sliding members
30a, 30b, 30c, 30d wheel assemblies
31 spring bolt
32 brake pedal
33 spring
34a cross bar beam 1
34b cross bar beam 2
35a, 35b, 35c, 35d, 35e fastening means
38a sliding extension member 1
38b sliding extension member 2
40 swivel wheel
42 wheel housing
44 axle nut
46 brake pad mount
48 brake pad
50 swivel ring
52 locking member housing
54 locking member
60 handle
62 anti collapse attachment
64 locking pin
66 spring lever
, Claims:1. A rack assembly (10) designed to handle and transport loads of varying sizes and dimensions, the rack assembly (10) comprising:
one or more vertical members (12a, 12b, 12c, 12d) each having a top section and a bottom section defining a length;
one or more top support members (14a, 14b) and optionally one or more bottom support members (16a, 16b) each having two ends defining a length;
one or more extended mounting plates (14, 16) of the top support members (14a, 14b) and the bottom support members (16a, 16b) connected to the vertical members (12a, 12b, 12c, 12d);
one or more crossbar assemblies (20a, 20b) having an upper end and a lower end defining a length;
a set of at least two-wheel assemblies (30a, 30b, 30c, 30d) connected to the bottom section of the vertical members (12a, 12b, 12c, 12d) through one or more wheel mounting plates (18a, 18b, 18c, 18d);
wherein the upper end of the crossbar assembly (20a, 20b) including one or more sliding members (26a, 26b, 26, 26d) configured to be slidably movable on the vertical members (12a, 12b, 12c, 12d);
wherein the lower end of the crossbar assembly (20a, 20b) connected to the bottom section of the vertical members (12a, 12b, 12c, 12d) above the wheel assemblies (30a, 30b, 30c, 30d) through one or more fastening means (35b).

2. The rack assembly (10) according to claim 1, wherein said rack assembly (10) is expandable, foldable and movable.

3. The rack assembly (10) according to claim 1, wherein the vertical members (12a, 12b, 12c, 12d) include a front side, a back side, a left side and a right side.

4. The rack assembly (10) according to claim 3, wherein the front side, the left side and the right side of the vertical members (12a, 12b, 12c, 12d) define a plurality of locking holes (24a).

5. The rack assembly (10) according to claim 1, wherein the extended mounting plate (14, 16) comprises a plurality of protrusions (21) and/or a plurality of grooves (23).

6. The rack assembly (10) according to claim 1, wherein the top support members (14a, 14b) and the bottom support members (16a, 16b) are connected to the vertical members (12a, 12b, 12c, 12d) by the protrusions (21) of the extended mounting plates (14, 16) connected with the locking holes (24a) of the vertical members (12a, 12b, 12c, 12d).

7. The rack assembly according to claim 1, wherein the top support members (14a, 14b) and the bottom support members (16a, 16b) are connected to the vertical members (12a, 12b, 12c, 12d) by a plurality of fastening means (35a) connecting the grooves (23) of the extended mounting plates (14, 16) and the locking holes (24a) of the vertical members (12a, 12b, 12c, 12d).

8. The rack assembly (10) according to claim 3, wherein the back side of the vertical members (12a, 12b, 12c, 12d) includes one or more sliding channels (24b);
wherein the sliding member (26a, 26b) is slidably arranged over the sliding channel (24b) of the vertical members (12a, 12b, 12c, 12d).

9. The rack assembly (10) according to claim 1, wherein the sliding member (26a, 26b) includes a handle (60), a spring lever (66) and a locking pin (64).

10. The rack assembly (10) according to claim 1, wherein the crossbar assembly (20a, 20b) comprises at least two crossbar beams (34a, 34b) each having a proximal end (15a, 15b) and a distal end (17a, 17b) connected to each other through one or more fastening means (35c).

11. The rack assembly (10) according to claim 10, wherein the crossbar beams (34a, 34b) include one or more sliding extension members (38a, 38b) capable of extending the length of the crossbar assembly (20a, 20b).

12. The rack assembly (10) according to claim 10, wherein the distal end (17a, 17b) of the crossbar beams (34a, 34b) is connected to the sliding member (26a, 26b) through the fastening means (35c).

13. The rack assembly (10) according to claim 10, wherein the proximal end (15a, 15b) of the crossbar beams (34a, 34b) is connected at the bottom section of the vertical members (12a, 12b, 12c, 12d) through the fastening means (35b).

14. The rack assembly (10) according to claim 1, wherein the wheel mounting plates (18a, 18b, 18c, 18d) comprises a top portion and a bottom portion;
wherein the top portion is connected to the vertical members (12a, 12b, 12c, 12d) and the bottom portion is connected to the wheel assemblies (30a, 30b, 30c, 30d) by one or more fastening means (35d).

15. The rack assembly (10) according to claim 1, wherein the wheel assemblies (30a, 30b, 30c, 30d) include one or more swivel ring (50) and one or more swivel wheels (40) housed in a wheel housing (42) connected through an axle nut (44).

16. The rack assembly (10) according to claim 1, wherein the wheel assemblies (30a, 30b, 30c, 30d) include a locking member (54) connected to a locking member housing (52) to restrict the rotational movement of the wheel.

17. The rack assembly (10) according to claim 1, wherein the wheel assemblies (30a, 30b, 30c, 30d) include a braking mechanism comprising a brake pedal (32), a brake pad mount (46), and a brake pad (48) to control the movement of the rack assembly (10).

18. The rack assembly (10) according to claim 1, wherein the sliding member (26a, 26b) comprising an anti-collapse attachment (62) to prevent unintended folding or collapse during use.

19. The rack assembly (10) according to claim 1, wherein the rack assembly (10) is made of a high-strength metal or a composite material to ensure durability and load-bearing capacity.