Description:FIELD OF INVENTION
[0001] The present invention is generally related to a rotational seat height adjustment apparatus, and more particularly to the rotational seat height adjustment apparatus for a two-wheeler vehicle.
BACKGROUND OF INVENTION
[0002] In the current state of two-wheeler design, most vehicles come with a fixed seat height that does not accommodate the diversity of rider sizes. As a result, taller riders often experience discomfort, as the fixed seat height may cause them to feel cramped or unable to reach the handlebars comfortably. Conversely, shorter riders may face similar challenges, such as difficulty reaching the handlebars or feeling unsupported while riding. These issues are compounded by the fact that there are few, if any, mechanisms in place for adjusting the seat height to better suit individual rider needs.
[0003] Additionally, fixed seat heights limit the design flexibility of two-wheelers, particularly in terms of available boot space. Riders who require a higher seat position are constrained by the lack of adjustability, and this restriction affects both their comfort and the vehicle's overall storage capacity. The inability to accommodate different seating positions further limits the utility of two-wheelers, especially in situations where a flexible seat height could be beneficial, such as for riders who share the vehicle or for those who frequently transport cargo.
[0004] It is therefore an objective of the present disclosure to overcome the above limitations at least in part by providing a seat height adjustment system for two-wheelers that can accommodate a range of rider heights. The present specification seeks to enhance rider comfort, increase adjustability, and expand vehicle storage capacity, offering a more versatile and ergonomic solution for diverse rider needs.
[0005] Thus, in view of the above, there is a long-felt need in the automobile industry to address the aforementioned deficiencies and inadequacies.

SUMMARY OF THE INVENTION
[0006] A rotational seat height adjustment apparatus for a two-wheeler vehicle is provided substantially, as shown in and/or described in connection with at least one of the figures.
[0007] An aspect of the present disclosure relates to a rotational seat height adjustment apparatus that includes a sliding hinge bracket; a guide bracket; a rotating cam; a set of locking screws; and a rotating knob. The rotating cam is mounted within the guide bracket. The rotating knob is coupled to the rotating cam via the set of locking screws. The sliding hinge bracket is slidably mounted to the guide bracket and configured to slide along a vertical direction. The rotating cam is operable to convert the rotational motion of the rotating knob into the vertical motion of the sliding hinge bracket to perform the seat height adjustment.
[0008] In an aspect, the sliding hinge bracket includes a set of holes configured to receive a set of rotating cam guides of the rotating cam corresponding to one or more seat height positions.
[0009] In an aspect, the rotating knob is configured to rotate the rotating cam up to 90 degrees in one or more of a clockwise, and a counterclockwise direction.
[0010] In an aspect, the rotating knob is pulled outward to disengage the set of rotating cam guides from the sliding hinge bracket to enable the sliding in the vertical direction of the sliding hinge bracket.
[0011] In an aspect, the rotating knob is configured to be pushed back after the sliding hinge bracket reaches the desired height to secure the set of rotating cam guides into the set of holes in the sliding hinge bracket with the set of locking screws.
[0012] In an aspect, the guide bracket is structured to constrain the vertical motion of the sliding hinge bracket within a predefined limit.
[0013] In an aspect, the locking screws are configured to securely fasten the rotating cam and sliding hinge bracket to prevent an unintended height adjustment.
[0014] In an aspect, the rotating knob is configured to rotate up to 90 degrees between consecutive seat height positions to facilitate a controlled adjustment of the sliding hinge bracket.
[0015] In an aspect, the rotating cam includes a cam profile configured to guide the motion of the sliding hinge bracket along the vertical direction during a rotational adjustment process.
[0016] In an aspect, the cam profile is shaped to allow a stepwise reduction in seat height as the rotating cam is rotated incrementally with each step.
[0017] Accordingly, one advantage of the present invention is that it addresses the issue of fixed seat heights, which do not account for the varying statures and preferences of riders.
[0018] One advantage of the present invention is that it provides a solution for improving rider comfort and vehicle functionality through a system that allows for easy seat height adjustment.
[0019] These features and advantages of the present disclosure may be appreciated by reviewing the following description of the present disclosure, along with the accompanying figures wherein reference numerals refer to like parts.
 
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings illustrate the embodiment of devices, systems, methods, and other aspects of the disclosure. Any person with ordinary skills in the art will appreciate that the illustrated element boundaries (e.g., boxes, groups of boxes, or other shapes) in the figures represent an example of the boundaries. In some examples, one element may be designed as multiple elements, or multiple elements may be designed as one element. In some examples, an element shown as an internal component of one element may be implemented as an external component in another and vice versa. Furthermore, the elements may not be drawn to scale.
[0021] Various embodiments will hereinafter be described in accordance with the appended drawings, which are provided to illustrate, not limit, the scope, wherein similar designations denote similar elements, and in which:
[0022] FIG. 1 illustrates an assembled view of a rotational seat height adjustment apparatus for a two-wheeler vehicle, in accordance with at least one embodiment.
[0023] FIG. 2 illustrates a closer view of the rotational seat height adjustment apparatus, in accordance with at least one embodiment.
[0024] FIG. 3 illustrates an exploded view of various components of the rotational seat height adjustment apparatus, in accordance with at least one embodiment.
[0025] FIGS. 4A-4C illustrate various steps of an assembly sequence of the rotational seat height adjustment apparatus, in accordance with at least one embodiment.
[0026] FIGS. 5A-5B illustrate a perspective view of the steps to be performed for a first position of seat height, in accordance with at least one embodiment.
[0027] FIGS. 6A-6B illustrate a perspective view of the steps to be performed for a second position of seat height, in accordance with at least one embodiment.
[0028] FIGS. 7A-7B illustrate a perspective view of the steps to be performed for a third position of seat height, in accordance with at least one embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENTS HEREIN
[0029] The present disclosure is best understood with reference to the detailed figures and description set forth herein. Various embodiments have been discussed with reference to the figures. However, those skilled in the art will readily appreciate that the detailed descriptions provided herein with respect to the figures are merely for explanatory purposes, as the methods and systems may extend beyond the described embodiments. For instance, the teachings presented and the needs of a particular application may yield multiple alternative and suitable approaches to implement the functionality of any detail described herein. Therefore, any approach may extend beyond certain implementation choices in the following embodiments.
[0030] References to “one embodiment,” “at least one embodiment,” “an embodiment,” “one example,” “an example,” “for example,” and so on indicate that the embodiment(s) or example(s) may include a particular feature, structure, characteristic, property, element, or limitation but that not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Further, repeated use of the phrase “in an embodiment” does not necessarily refer to the same embodiment.
[0031] The proposed rotational seat height adjustment apparatus aims to address the limitations associated with fixed seat heights in two-wheelers, which often result in discomfort for riders of varying statures. Further, the rotational seat height adjustment apparatus enhances rider comfort by accommodating diverse height preferences. Additionally, the proposed rotational seat height adjustment apparatus seeks to optimize storage capacity by enabling flexibility in seat height adjustment, thereby offering a versatile and ergonomic solution for improving the overall riding experience.
[0032] FIG. 1 illustrates an assembled view of a rotational seat height adjustment apparatus 102 for a two-wheeler vehicle 104, in accordance with at least one embodiment. Examples of the two-wheeler vehicle 104 include but are not limited to a two-wheeler electric vehicle or a scooter. The rotational seat height adjustment apparatus 102 consists of several essential components meticulously assembled to ensure optimal functionality and reliability.
[0033] FIG. 2 illustrates a closer view of the rotational seat height adjustment apparatus 102, in accordance with at least one embodiment. The rotational seat height adjustment apparatus 102 is designed to provide riders with the ability to customize the seat height to suit their individual preferences. The rotational seat height adjustment apparatus 102 enables seamless and precise adjustments, allowing users to select a seat height that best matches their stature and ergonomic needs. By accommodating riders of varying heights, the rotational seat height adjustment apparatus 102 significantly enhances comfort during use, ensuring an optimal riding posture and reducing strain on the body. This feature not only improves the overall riding experience but also increases the versatility of the two-wheeler, making it more accessible and user-friendly for a diverse range of users.
[0034] FIG. 3 illustrates an exploded view of various components of the rotational seat height adjustment apparatus 102, in accordance with at least one embodiment. FIG. 3 is explained in conjunction with the elements of FIG. 1- FIG. 2. The rotational seat height adjustment apparatus 102 includes a sliding hinge bracket 106; a guide bracket 108; a rotating cam 110; a set of locking screws (112a, 112b, 112c); and a rotating knob 114. The rotating cam 110 is mounted within the guide bracket 108. The rotating knob 114 is coupled to the rotating cam 110 via the set of locking screws (112a, 112b, 112c).
[0035] The sliding hinge bracket 106 is slidably mounted to the guide bracket 108 and configured to slide along a vertical direction. The rotating cam 110 is operable to convert the rotational motion of the rotating knob 114 into vertical motion of the sliding hinge bracket 106 to perform the seat height adjustment. In an embodiment, the sliding hinge bracket 106 includes a set of holes 116 configured to receive a set of rotating cam guides (110a, and 110b) of the rotating cam 110 corresponding to one or more seat height positions.
[0036] In an embodiment, the rotating knob 114 is configured to rotate the rotating cam 110 up to 90 degrees in one or more of a clockwise, and a counterclockwise direction. In an aspect, the rotating knob 114 is pulled outward to disengage the set of rotating cam guides (110a, and 110b) from the sliding hinge bracket 102 to enable the sliding in the vertical direction of the sliding hinge bracket 102. In an embodiment, the rotating knob 114 is configured to be pushed back after the sliding hinge bracket 102 reaches the desired height to secure the set of rotating cam guides (110a, and 110b) into the set of holes 116 in the sliding hinge bracket 102 with the set of locking screws (112a, 112b, 112c). In an embodiment, the rotating knob 114 is configured to rotate up to 90 degrees between consecutive seat height positions to facilitate a controlled adjustment of the sliding hinge bracket 106. In an embodiment, the set of locking screws (112a, 112b, 112c) are configured to securely fasten the rotating cam 110 and sliding hinge bracket 106 to prevent an unintended height adjustment.
[0037] In an embodiment, the guide bracket 108 is structured to constrain the vertical motion of the sliding hinge bracket 106 within a predefined limit. In an embodiment, the rotating cam 110 includes a cam profile configured to guide the motion of the sliding hinge bracket 106 along the vertical direction during a rotational adjustment process. In an embodiment, the cam profile is shaped to allow a stepwise reduction in seat height as the rotating cam 110 is rotated incrementally with each step.
[0038] As used herein, and unless the context dictates otherwise, the term “configured to” or “coupled to” is intended to include both direct coupling (in which two elements that are coupled to each other contact each other) and indirect coupling (in which at least one additional element is located between the two elements). Therefore, the terms “configured to”, “configured with”, “coupled to” and “coupled with” are used synonymously.
[0039] The rotational seat height adjustment apparatus 102 provides a user-friendly mechanism for adjusting the seat height of a two-wheeler to meet individual rider preferences. The rotational seat height adjustment apparatus 102 enhances rider comfort by accommodating users of varying heights, ensuring ergonomic riding posture, and reducing physical strain. By enabling seamless adjustments, the rotational seat height adjustment apparatus 102 contributes to a more versatile and inclusive riding experience, making it suitable for a broader range of riders.
[0040] FIGS. 4A-4C illustrate various steps of an assembly sequence of the rotational seat height adjustment apparatus, in accordance with at least one embodiment. FIGS. 4A-4C are explained in conjunction with the elements of FIG. 1- FIG. 3.
[0041] The assembly of the rotational seat height adjustment apparatus 102 involves a systematic process to ensure precise functionality. As shown in FIG. 4A, in Step 1, the rotating cam 110 is inserted into the guide bracket 108, forming the core of the adjustment mechanism. The rotating cam 110 includes a set of rotating cam guides (110a, and 110b) on which one side of the rotating knob 114 is placed, and on the opposite side, rotating cam guides are placed with the sliding hinge bracket 106 to facilitate smooth adjustment and secure positioning of the seat height.
[0042] As shown in FIG. 4B, in step 2, the rotating knob 114 is attached to the rotating cam 110 using a set of locking screws (112a, 112b, 112c), securing the rotating knob 114 in place and enabling rotational control. As shown in FIG. 4C, in step 3, the sliding hinge bracket 106 is placed on guide bracket 108, completing the structural assembly of the rotational seat height adjustment apparatus 102.
[0043] Thus, the assembly process begins with the insertion of the rotating cam 110 into the guide bracket 108, establishing the foundational connection for the rotational adjustment mechanism. The rotating knob 114 is then mounted onto the rotating cam 110 using the locking screws (112a, 112b, 112c), which ensure secure engagement between the components. Subsequently, the sliding hinge bracket 106 is positioned onto the guide bracket 108 and fastened using the same set of locking screws (112a, 112b, 112c). This configuration sets the seat to its default height, establishing a baseline from which users can make precise adjustments as needed.
[0044] The rotational seat height adjustment apparatus 102 enables a four-stage process for adjusting the seat height of a two-wheeler, ensuring ergonomic comfort for riders of varying heights. For example, in the initial position, the seat is set at its maximum height of approximately 785 mm from the ground. At this height, the rotating cam 110 is securely positioned within the sliding hinge bracket 106, locking the seat into its highest configuration. This provides a stable baseline for further adjustments.
[0045] To adjust the seat height, the user pulls the rotating knob 114 outward. This action disengages the rotating cam guides (110a, and 110b) from the sliding hinge bracket 106, allowing the sliding hinge bracket 106 to move freely along the guide bracket 108 in a vertical direction. The next step involves the user rotating the rotating knob 114 either clockwise or counterclockwise, up to 90 degrees. This rotational motion of the rotating cam 110, facilitated by its cam profile, causes the sliding hinge bracket 106 to slide vertically to a new position. At this intermediate position, the locking screws (112a, 112b, 112c) of the rotating cam 110 secure the seat at a height of approximately 775 mm.
[0046] Once the desired seat height is reached, the user pushes the rotating knob 114 back into its original position. This action re-engages the rotating cam guides with the holes in the sliding hinge bracket 106, locking the mechanism securely with the help of the locking screws (112a, 112b, 112c). The guide bracket 108 ensures that the vertical motion of the sliding hinge bracket 106 remains constrained within predefined limits, maintaining alignment and stability. The rotational adjustment mechanism operates seamlessly by translating the rotational motion of the rotating cam 110 into precise vertical movement of the sliding hinge bracket 106 based on the cam profile, offering users a reliable and customizable seat height adjustment solution.
[0047] The rotational seat height adjustment apparatus 102 facilitates precise seat height customization for two-wheeler vehicles by employing a systematic process for transitioning between predefined height positions. The adjustment mechanism comprises a rotating knob 114, rotating cam 110, sliding hinge bracket 106, and guide bracket 108. Each height position (first, second, and third) is achieved through an intuitive two-step process involving rotation and locking of the knob 114, ensuring both ease of operation and secure engagement.
[0048] FIGS. 5A-5B illustrate a perspective view of the steps to be performed for a first position of seat height, in accordance with at least one embodiment. FIGS. 5A-5B are explained in conjunction with the elements of FIG. 1- FIG. 4. The rotational seat height adjustment apparatus 102 provides three adjustable seat height positions, enabling riders to select a configuration that best suits their preferences and requirements. In the first position, the seat height is set at approximately 785 mm from the ground, representing the maximum height achievable with the apparatus. At this position, the rotating cam guides are securely aligned with two designated holes in the sliding hinge bracket 106. This alignment ensures that the seat is locked in place at its highest configuration, providing maximum ground clearance and an elevated seating posture.
[0049] In the first position, the seat is set to a maximum height of approximately 785 mm. To achieve this position, the user pulls the rotating knob 114 outward and rotates it 90° to unlock the mechanism. This rotation allows the sliding hinge bracket 106 to move freely along the guide bracket 108. Once the desired height is achieved, the knob 114 is pressed back into place. This action causes the rotating cam 110 to engage securely with the holes in the sliding hinge bracket 106, effectively locking the seat height in position and restricting further movement.
[0050] FIGS. 6A-6B illustrate a perspective view of the steps to be performed for a second position of seat height, in accordance with at least one embodiment. FIGS. 6A-6B are explained in conjunction with the elements of FIGS. 1- FIG. 5. In the second position, the seat height is lowered to approximately 775 mm. The reduction of 10 mm is achieved by rotating the rotating cam 110 within the guide bracket 108, causing the sliding hinge bracket 106 to move downward along the cam profile. This motion is facilitated by the disengagement and re-engagement of the rotating cam guides as they transition from the first position to the second position. The locking screws (112a, 112b, 112c) secure the components in this intermediate position, ensuring stability while maintaining a slightly lower seat height for enhanced rider accessibility and comfort.
[0051] In operation, the second position corresponds to a mid-range seat height of approximately 775 mm. Similar to the first position, the user begins by pulling the knob 114 outward and rotating it 90° to release the locking mechanism. The sliding hinge bracket 106 then slides vertically along the guide bracket 108 until the second height setting is reached. Once the adjustment is complete, the user presses the knob 114 back, engaging the rotating cam pin 110 into the designated holes of the sliding hinge bracket 106. This engagement ensures the seat height remains securely locked in the adjusted position, preventing unintended movement during use.
[0052] FIG. 7A-7B illustrate a perspective view of the steps to be performed for a third position of seat height, in accordance with at least one embodiment. FIG. 7A-7B are explained in conjunction with the elements of FIGS. 1- FIG. 6. The third position corresponds to the default setting of the seat height, typically used during vehicle delivery to end customers. At this position, the seat height is approximately 765 mm from the ground. Similar to the adjustments made for the second position, the transition to the third position is facilitated by further rotation of the rotating cam 110, which directs the sliding hinge bracket 106 along the cam profile to its lowest position. This default configuration accommodates a wider range of riders, offering a comfortable and ergonomic riding experience. The precise design of the rotating cam 110 and sliding hinge bracket 106 ensures that all three positions are securely maintained, with the guide bracket 108 providing alignment and support throughout the adjustment process.
[0053] In operation, the third position sets the seat height to approximately 765 mm, the default position at which vehicles are often delivered to customers. The adjustment process is identical to the previous positions: the user pulls the knob 114, rotates it 90° to disengage the locking mechanism, and slides the sliding hinge bracket 106 downward along the guide bracket 108. Pressing the knob 114 back engages the rotating cam pin 110 with the corresponding holes in the sliding hinge bracket 106, securing the seat height at the lowest position. This stepwise adjustment process allows users to achieve their desired seat height with minimal effort while ensuring stable and reliable operation during riding.
[0054] The rotational seat height adjustment apparatus 102 provides a customizable range of seat height adjustments from approximately 785 mm to 765 mm, catering to variations in human height, seating posture, aesthetic preferences, and end-customer requirements. The rotational seat height adjustment apparatus 102 introduces increments of approximately 10 mm within this range, allowing riders to fine-tune their seating position for optimal comfort. By offering this flexibility, the apparatus enhances the overall riding experience and stands out as a unique selling point among features of two-wheelers.
[0055] In contrast to the fixed seat heights offered by many Original Equipment Manufacturer (OEM) two-wheelers, this invention addresses the diverse needs of riders. The rotational seat height adjustment apparatus 102 features an innovative rotational adjustment process facilitated by the rotating cam 110 and sliding hinge bracket 106. These components work in harmony to allow smooth and secure vertical adjustments, ensuring the seat height can be easily modified by riders. The inclusion of three distinct positions such as 785 mm, 775 mm, and 765 mm caters to a broad range of user preferences and demographic requirements. The guide bracket 108 ensures stability and alignment throughout the adjustment process, while the locking screws 112a, 112b, and 112c provide reliable engagement at the selected height position.
[0056] The rotational seat height adjustment apparatus 102 provides several key features that contribute to its practicality and innovation. The rotational seat height adjustment apparatus 102 enhances comfort and accommodates users of varying heights, providing significant customization options. The rotational motion adjustment process, utilizing the rotating cam 110 and sliding hinge bracket 106, simplifies operation, making it intuitive for riders. The multiple height positions enable users to choose from three levels, each incrementally separated by approximately 10 mm. The rotating cam assembly, which integrates a rotating knob 114 and sliding hinge bracket 106, facilitates smooth and secure transitions between height positions. Additionally, the invention is easy to install, compatible with existing two-wheeler models, and requires minimal components for integration, making it a versatile and cost-effective solution.
[0057] The commercial applications and advantages of this rotational seat height adjustment apparatus over existing technologies are significant. By providing enhanced comfort and customization, the rotational seat height adjustment apparatus 102 resolves a common limitation in two-wheelers, ensuring a more enjoyable and personalized riding experience. The invention's versatility allows it to accommodate a wide range of rider heights and preferences, making it suitable for diverse demographics. Companies adopting this technology gain a competitive advantage by offering an innovative feature that distinguishes their products in the market. Moreover, the mechanism expands the potential customer base by appealing to users with specific ergonomic needs or height requirements. Ultimately, the rotational seat height adjustment apparatus 102 delivers improved ergonomics, reduced fatigue during long rides, and increased overall user satisfaction, making it a valuable addition to modern two-wheeler designs.
[0058] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the scope of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, utilized, or combined with other elements, components, or steps that are not expressly referenced.
[0059] No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
[0060] It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope of the invention. There is no intention to limit the invention to the specific form or forms enclosed. On the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the scope of the invention, as defined in the appended claims. Thus, it is intended that the present invention cover the modifications and variations of this invention, provided they are within the scope of the appended claims and their equivalents.
, Claims:I/We claim:
1. A rotational seat height adjustment apparatus (102), comprising:
a sliding hinge bracket (106);
a guide bracket (108);
a rotating cam (110) mounted within the guide bracket (108);
a set of locking screws (112a, 112b, 112c); and
a rotating knob (114) coupled to the rotating cam (110) via the set of locking screws (112a, 112b, 112c), wherein the sliding hinge bracket (106) is slidably mounted to the guide bracket (108) and configured to slide along a vertical direction, wherein the rotating cam (110) is operable to convert rotational motion of the rotating knob (114) into vertical motion of the sliding hinge bracket (106) to perform the seat height adjustment.

2. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the sliding hinge bracket (106) comprises a set of holes (116) configured to receive a set of rotating cam guides (110a, and 110b) of the rotating cam (110) corresponding to one or more seat height positions.

3. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the rotating knob (114) is configured to rotate the rotating cam (110) up to 90 degrees in one or more of a clockwise, and a counterclockwise direction.

4. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the rotating knob (114) is pulled outward to disengage the set of rotating cam guides (110a, and 110b) from the sliding hinge bracket (102) to enable the sliding in the vertical direction of the sliding hinge bracket (102).

5. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the rotating knob (114) is configured to be pushed back after the sliding hinge bracket (102) reaches the desired height to secure the set of rotating cam guides (110a, and 110b) into the set of holes (116) in the sliding hinge bracket (102) with the set of locking screws (112a, 112b, 112c).

6. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the guide bracket (108) is structured to constrain the vertical motion of the sliding hinge bracket (106) within a predefined limit.

7. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the set of locking screws (112a, 112b, 112c) are configured to securely fasten the rotating cam (110) and sliding hinge bracket (106) to prevent an unintended height adjustment.

8. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the rotating knob (114) is configured to rotate up to 90 degrees between consecutive seat height positions to facilitate a controlled adjustment of the sliding hinge bracket (106).

9. The rotational seat height adjustment apparatus (102) as claimed in claim 1, wherein the rotating cam (110) comprises a cam profile configured to guide the motion of the sliding hinge bracket (106) along the vertical direction during a rotational adjustment process.

10. The rotational seat height adjustment apparatus (102) as claimed in claim 9, wherein the cam profile is shaped to allow a stepwise reduction in seat height as the rotating cam (110) is rotated incrementally with each step.