Rise and recline chair mechanism

Abstract

The mechanism for a rise and recline chair comprises a base 102, a main body 106, and a first linkage assembly 108. There are leg attachments 104 extending outwards from the base, each providing an at

Description

FIELD The present invention relates to a mechanism for a chair. More specifically, the present invention relates to a rise and recline mechanism for a chair that is arranged to maintain a wood-to-floor aesthetic whilst also providing improved functionality and safety features. BACKGROUND Rise and recline chairs, also known as lift and recline, and lift and tilt chairs, are examples of mobility aids for improving a user’s ability to independently get into and / or out of a chair, such as an armchair. Such chairs are provided with a controllable internal actuating mechanism that is capable of raising and altering the orientation of the sitting surface to assist a user in getting into and / or out of the chair. The internal actuating mechanisms are often arranged to also enable a user to transition between upright, partially reclined, and fully reclined sitting positions. This can improve the comfort of the armchair and may carry other health benefits. Rise and recline chairs are particularly useful for individuals with existing or developing mobility issues, such as the elderly or physically impaired, who may otherwise struggle to get into and / or out of a regular armchair without external assistance. The use of such mobility aids can improve the quality of life of the user and can help them to regain their independence. Existing rise and recline chairs typically provide what is known in the art as a metal-to-floor aesthetic, whereby the actuating mechanism is located within an extended base of the chair located beneath the seat. In such arrangements, the internal actuating mechanism may be only partially hidden during the operation of the mechanism. This type of arrangement provides a chair with a base that extends all the way to the floor. This can provide mobility aid chairs with a heavy body that is difficult to move and under which it is difficult to clean. Therefore, there is a need to provide chairs that provide a user with safe rise and recline functionality whilst also providing a more practical structure. SUMMARY According to the present invention, there is provided an apparatus as set forth in the appended claims. Other features of the invention will be apparent from the dependent claims, and the description which follows. According to an aspect of the present invention, there is provided a mechanism for a rise and recline chair. The mechanism comprises a base. The base comprises a plurality of leg attachment points that extend outwards from the base. Each leg attachment point of the plurality of leg attachment points is configured to provide an attachment point for a chair leg. The mechanism further comprises a main body. The mechanism further comprises a first linkage assembly that is configured to couple the main body to the base and enable the main body to lift and / or tilt relative to the base. A bottom face of the base defines a horizontal base plane and the upper edges of the plurality of leg attachment points define a horizontal leg attachment plane. The base plane is located below the leg attachment plane. Advantageously, the mechanism may provide a mechanism capable of assisting a user to get into or out of a chair using said mechanism by enabling a user to contact the floor during the operation of the mechanism. The relative arrangement of the base plane and leg attachment plane provides an advantageous geometry by enabling the mechanism to be completely hidden within the seat of a chair in which the mechanism is used, thereby providing any chair using the mechanism with a base that is raised from the floor, thereby providing a more practical chair that allows easier cleaning underneath. Further advantageously, the arrangement of the bottom face of the base being lower than the main body, linkage assemblies, leg attachment points, and the associated horizontal leg attachment plane, provides the mechanism and / or an associated chair comprising the mechanism with a lower centre of gravity. This further improves the stability and safety of the mechanism or a chair using the mechanism. The base may be the lowest component of the mechanism. The base may enable the attachment of various other components as will be described herein. The attachment of chair legs to said leg attachment points may raise the mechanism, and therefore a chair once completely assembled, upwards and away from a floor to provide a wood-to-floor appearance instead of a metal-to-floor arrangement. The base may have a substantially square shape or footprint. The leg attachment points may be located at the corners of the base and extend therefrom to provide stability. The main body and the base are separate components to enable relative movement between these components. The base and main body may be the largest components of the mechanism. The main body and / or base may comprise a plurality of attachment points configured to provide attachment of padding, cushioning, upholstery, and the like, arranged around the mechanism to provide comfort to a user. The first linkage assembly may comprise components discussed in more detail herein. The lifting action provided by the first linkage assembly may be configured to assist a user stand up while sitting in a chair including the mechanism. The lifting action provided by the first linkage assembly may be further configured to assist a standing user to sit down in a chair including the mechanism. The tilting action provided by the first linkage assembly may further improve a user’s ability to safely get into or out of a chair including the mechanism by providing a supporting surface against which a user may lean. The relative position of the leg attachment plane and base plane may provide the mechanism with a more compact design, thereby enabling the entire mechanism to fit within a smaller chair, or to take up less space within a chair. This arrangement may further enable the mechanism to remain completely hidden within the seat of a chair without requiring a base or skirting to also be included to hide said mechanism for the sake of providing an improved visual appearance. The leg attachment points may comprise a plurality of fixture attachment points. The fixture attachment points may be configured to receive a suitable fastening means to enable a chair leg to be securely attached to the leg attachment point. The mechanism may further comprise a second linkage assembly. The second linkage assembly may be configured to couple a first support to the main body. The second linkage assembly may be further configured to transition the second linkage assembly and first support between an extended configuration and a retracted configuration. Advantageously, the extension and retraction of the second linkage and associated first support may provide a surface upon which a user may rest their legs. This arrangement may therefore provide an alternative sitting position that may be useful for users with health conditions that require a more horizontal sitting position. The second linkage assembly may comprise a plurality of link elements arranged together to provide extension and retraction of the second link assembly and first support. The plurality of link elements of the second linkage assembly may fold away when the mechanism is in a retracted state, for example, the link elements may neatly fold into a front portion of the main body. The second linkage assembly may comprise a sub-linkage assembly and a second support. The sub-linkage assembly may be configured to couple the second support to the second linkage assembly. The sub-linkage assembly and second support may be configured to transition between an extended configuration and a retracted configuration according to / in concert with the extension or retraction of the second linkage assembly and first support. Advantageously, the extension and retraction of the sub-linkage assembly and second support may provide a further surface upon which a user may rest their legs and / or feet. This arrangement may therefore provide an alternative sitting position that may be useful for users with health conditions that require a more horizontal sitting position, orthose who require sturdy foot support. The sub-linkage assembly may comprise a plurality of link elements arranged together to provide extension and retraction of the sub-linkage assembly and second support. The plurality of link elements of the sub-linkage assembly may fold away when the mechanism is in a retracted state, for example, the link elements may neatly fold into a front portion of the main body. The extension and retraction of the sub-linkage assembly, and therefore the second support, may be entirely reliant on the extension and retraction state of the second linkage assembly. When the second linkage assembly and sub-linkage assembly are in an extended configuration, the first and second supports may be extended outwards away from the main body of the mechanism. When the second linkage assembly and sub-linkage assembly are in an extended configuration, the first and second supports may be configured to completely support a user’s legs and feet. Advantageously, the extension of the second linkage, sub linkage, and first and second supports may provide a supporting surface for a user’s legs and / or feet to provide a more comfortable sitting position. This may provide the user with a more horizontal sitting position. This configuration may be useful for users who suffer from ailments that require or benefit from a more horizontal sitting position. When the linkage assembly and sub-linkage assembly are in a retracted configuration, the second support may be configured to stow between the first support and the main body of the mechanism. When the linkage assembly and sub-linkage assembly are in a retracted configuration, the second support may be configured to stow in a position above the horizontal leg attachment plane. When the second linkage assembly and sub-linkage are in a retracted configuration, the second support may not be visible. For example, the second support may not be visible from a normal external viewing position e.g., a standing adult’s perspective due to the forward position of the first support relative to the second support. Advantageously, the stowing of the second support as described may provide a more compact chair mechanism. This arrangement may ensure clearance between the bottom of the chair or mechanism and the floor, thereby enabling easier cleaning under said chair / mechanism whilst also providing an aesthetically pleasing appearance. The second support may be configured to extend further away from the main body of the mechanism than the first support. Advantageously, this arrangement may ensure that the second support is arranged at a suitable distance to support a user’s feet when the mechanism is in an extended or reclined configuration. The second support may be smaller than the first support. The second support may be inclined relative to the first support when in an extended configuration. The mechanism may further comprise a hinge plate fixedly attached to the base and configured to provide at least one pivot point. The mechanism may further comprise at least one strut. The at least one strut may be configured to provide an attachment between the at least one pivot point of the hinge plate and the main body. The at least one strut may be further configured to limit the movement of the main body relative to the base. Advantageously, this arrangement provides a sturdy mechanism for enabling the lifting and tilting of the main body relative to the base. Further, the arrangement of the hinge plate, at least one pivot point, and at least one strut ensure that a user’s feet can remain in contact with the ground while the mechanism is lifting and / or tilting. In addition, the relative positions of the at least one pivot point within the hinge plate enable strut lengths to be used that ensure that the arc of the lift follows a path that is conducive to the user’s mobility requirements. The first linkage assembly of the mechanism may comprise the hinge plate, at least one pivot point, and at least one strut. The strut may be a rod having a fixed length. The hinge plate may be attached to the base at a substantially central position along at least one side of the base. Advantageously, this configuration may provide a balance between strength, mechanical leverage, range of motion, and compactness of the mechanism. The mechanism may comprise a first linkage assembly having a hinge plate, at least one pivot point, and at least one strut on one side of the base. The mechanism may comprise a first linkage assembly having a hinge plate, at least one pivot point, and at least one strut on one side of the base on both sides of the base. This may provide an arrangement having increased strength. The hinge plate may comprise a first pivot point positioned in an upper portion of the hinge plate and a second pivot point positioned in a lower position of the hinge plate closer to a rear side of the base than a front side. A first strut may connect the first pivot point of the hinge plate to a first attachment point on the main body and a second strut may connect the second pivot point of the hinge plate to a second attachment point on the main body. Advantageously, this arrangement of pivot points may ensure that a user’s feet can remain in contact with the ground while the mechanism is lifting and / or tilting. The relative positions of the first and second pivot points, in conjunction with the strut lengths, may ensure that the arc of the lift follows a path that is conducive to the user’s mobility requirements. The use of first and second struts may improve the lifting and tilting strength of the mechanism. The use of first and second struts may increase the weight limit of the mechanism by providing a stronger and more sturdy mechanism. The use of first and second strut may further enable the arc of movement during lifting and / or tilting operations to be controlled. The first and second struts may have different lengths. The mechanism may further comprise at least one actuator configured to provide a mechanical input. For example, the mechanism may further comprise first and second actuators. The actuator may be configured to provide a mechanical input to extend and / or retract the first linkage assembly; and / or extend and / or retract the second linkage assembly. Advantageously, the mechanical input may be used to drive elements of the mechanism, such as the various linkage assemblies, to move between extended / retracted states, and to provide lift or tilting movement. The actuator may comprise an electrical motor. The actuator may further comprise an actuator rod configured to transfer movement from the motor to an element of the mechanism, such as a linkage assembly. The actuator rod may be telescopic or the like. Extension or retraction of the actuator rod may in turn cause extension, retraction, lifting, or tilting of linkage assembly components of the mechanism. The skilled person will appreciate that the resulting movement provided by the actuator will be dependent upon how it is connected, and what elements of the mechanism it is connected to. In some examples, the mechanism may comprise multiple actuators, with corresponding actuator rods, configured to provide a mechanical input to different elements. In this way, the various linkage assemblies and moveable components within the chair mechanism may be controlled independently. For example, a first actuator may be connected to the first linkage assembly, and a second actuator may be connected to the second linkage assembly. The main body may comprise a third linkage assembly and a reclining portion. The third linkage assembly may be configured to change the inclination of the reclining portion relative to the main body to provide a reclining action. Advantageously, the reclining action provided may provide a more comfortable or ergonomic seating arrangement. The reclining action may also be useful for users who have who suffer from ailments that require or benefit from a more horizontal sitting position. Other advantages of a reclined seating position may include improved posture and spinal alignment, reduced muscle tension and stress, enhanced circulation and blood flow, joint pressure relief, and reduced back pain. The third linkage assembly and reclining portion may extend or retract according to / in concert with the extension or retraction of the second linkage assembly, first support, and / or second support. The third linkage assembly and associated reclining portion may be located towards a rear of the chair mechanism. The reclining portion may be inclined substantially upright relative to the base of the mechanism. The reclining portion may have various attachment points to enable a chair back to be fitted, alongside the associated cushioning, padding, and upholstery. The actuator may be configured to provide a mechanical input to extend and / or retract the third linkage assembly. Advantageously, a user may have independent control of the reclining portion using said actuator. A mechanism may comprise multiple actuators, such as first and second actuators, with each being arranged to provide a mechanical input to a different linkage assembly or assemblies. For example, a first actuator may be arranged to provide a mechanical input to multiple linkage assemblies and a second actuator may be arranged to provide a mechanical input to a different assembly or assemblies. For example, an actuator may be configured to provide a mechanical input to control the extension / retraction of the second and third linkage assemblies so that these elements move in tandem to provide a reclining action. The mechanism may further comprise an input device and a controller. The input device may be configured to receive an input from a user and the controller may be configured to then control an actuator to provide movement according to the user input. Advantageously, this arrangement may enable a user to control the lifting, tilting, and reclining actions of the mechanism, thereby allowing the user to have full control of the mechanism to achieve a comfortable sitting position or to assist the user in getting into or out of a chair including the mechanism. The input device may be wired or wireless. Where a wireless input device is used, the input device may be connectable to the controller via any suitable connection means, such as via Bluetooth®. Each actuator may have a controller that is configured to receive a signal from the input device and translate said input into a mechanical movement. The input device may be a mobile device, such as a mobile phone having a suitable application that is connectable to the controller. The leg attachment plane may be inclined relative to a floor level. Alternatively, the leg attachment plane may be level with the floor. Advantageously this may provide the mechanism with a structure that is more optimal for enabling a user to get into or out of a chair including the mechanism. This arrangement may angle the main body and base appropriately when the chair legs are attached to the leg attachment points. The plurality of leg attachment points may be curved in an upward direction away from the base plane. Advantageously, the relative arrangement of the base plane and leg attachment plane, as provided by the curved leg attachment points provides an advantageous geometry by enabling the mechanism to be completely hidden within the seat of a chair in which it is used, thereby providing any chair using the mechanism with an enhanced visual appeal and improved wood-to-floor aesthetic. The curvature may further increase the strength of the leg attachment points. The base plane and leg attachment plane may be spaced relative to one another so as to enable a user to maintain direct physical contact with a floor during lifting and / or tilting of the main body relative to the base. Advantageously, by enabling a user to maintain solid contact with the floor, the user is less likely to fall out of a chair during use, thereby reducing the likelihood that a user will be injured. The ability of the user to maintain contact with the floor thereby increases the safety of the mechanism and chairs that it is used in. According to another aspect of the present invention, there is provided a chair comprising the mechanism described above. The chair may further comprise upholstery, padding, cushioning, and the like, arranged around the mechanism to provide comfort to a user. Advantageously, a chair having the mechanism described above provides a more user-friendly and safer rise and recline chair. As used herein, unless otherwise expressly specified, all numbers such as those expressing values, ranges, amounts or percentages may be read as if prefaced by the word “about”, even if the term does not expressly appear. The term “about” when used herein means +1-10% of the stated value. Also, any numerical range recited herein is intended to include all sub-ranges subsumed therein. Singular encompasses plural and vice versa. The terms "comprising" and "comprises" as used herein are synonymous with "including" or "containing" and are inclusive or open-ended and do not exclude additional, non-recited members, elements or method steps. Additionally, although the present invention has been described in terms of “comprising”, the processes, materials, and coating compositions detailed herein may also be described as “consisting essentially of’ or “consisting of’. When used herein, “average” refers to mean average, unless otherwise provided for. All the features contained herein may be combined with any of the above aspects in any combination. BRIEF DESCRIPTION OF DRAWINGS Features of examples of the present disclosure will become apparent by reference to the following detailed description and drawings. For the sake of brevity, reference signs or features having a previously described function may or may not be described in connection with other drawings in which they appear. FIG. 1 shows a right-side elevation of the chair mechanism of the present invention in an upright sitting configuration. FIG. 2 shows a front elevation of the chair mechanism of the present invention in an upright sitting configuration. FIG. 3 shows a front upper left side perspective view of the chair mechanism of the present invention in an upright sitting configuration. FIG. 4 shows a front upper right side perspective view of the chair mechanism of the present invention a raised and tilted configuration. FIG. 5 shows a right-side elevation of the chair mechanism of the present invention in a raised configuration. FIG. 6 shows a right-side elevation of the chair mechanism of the present invention in a reclined configuration. FIG. 7 shows a block circuit diagram for a chair mechanism. Detailed Description Hereinafter, various examples will be described with reference to the accompanying figures. The examples described below may be modified and implemented in various forms. In order to more clearly describe the features of the examples, detailed descriptions of matters well known to those skilled in the art to which the following examples belong will be omitted. In the present disclosure, when an element is described as "connected" or “coupled” with another element, this includes not only “directly connected” or “directly coupled”, but also “connected with another element therebetween” or “coupled with another element therebetween”. In addition, when one element is described to "include" another element, this means that, unless specifically stated otherwise, the one element may further include other elements rather than excluding other elements. Figure 1 shows a right-side elevation of a chair mechanism 100 arranged in an upright sitting configuration. The mechanism 100 is intended for use in a rise and recline, lift and recline, or lift and tilt chair. It will be understood by the skilled person that references to a chair are towards a chair having, including, or incorporating the mechanism 100. Such mechanisms 100 are commonly incorporated into armchairs, however this is not limiting and the mechanism 100 may be applicable to other types of chairs. As used herein, the terms front, forward, or the like refer to the X+ direction; the terms back, rear, or the like refer to the X- direction; the terms above, upper, or the like refer to the Z+ direction; and the terms below, lower, or the like refer to the Z- direction as depicted in Figures 1,3, and 4. As illustrated in Figure 1, the mechanism 100 comprises a base 102. The base 102 has a bottom face 110 that defines a horizontal base plane B. The base 102 has a substantially square footprint comprising at least one side 128, such as at least four sides. The shape of the base 102 is more clearly shown in Figures 3 and 4. Returning to Figure 1, at least one side 128 of the base 102 is visible from the right-side elevation. The sides 128 of the base 102 are configured to enable the attachment of various other elements as will be discussed in more detail below. The base 102 comprises a plurality of leg attachment point 104. The base 102 comprises four leg attachment point 104, with each being arranged at the extreme corners of the base 102 to provide the mechanism 100 and associated chair with improved stability. The leg attachment point 104 provide an attachment point for chair legs, such as wooden chair legs. Once attached, the chair legs contact a floor, as shown by the floor level F and provide spacing between the bottom face 110 of the base 102 and the associated horizontal base plane B, and the floor level F. The leg attachment point are curved in an upwards direction i.e., towards the Z+ direction. Each of the plurality of leg attachment points 104 comprise an upper edge 112. The upper edges 112 of the plurality of leg attachment points 104 defines a horizontal leg attachment plane L. The upward (Z+) curvature of the leg attachment points 104 provides an arrangement whereby the horizontal base plane B is located below the horizontal leg attachment plane L. In other words, the horizontal base plane B is located between the horizontal leg attachment plane L and the floor level F. As further shown in Figure 1, the mechanism 100 comprises a main body 106. The main body 106 is located above the base 102. The base 102 and main body 106 components are the largest components of the mechanism 100 and provide attachment points for various other elements of the mechanisms 100 to attach to. The main body 106 may be formed of a plurality of panels and connecting elements configured to provide a suitable structure to which cushioning, padding, and the like may be attachable to form a chair. The main body 106 may form the seat portion of a chair in which the mechanism 100 is incorporated. The mechanism 100 further comprises a first linkage assembly 108, as shown by the dashed box closest to the front of the mechanism 100 i.e., in the X+ direction. The first linkage assembly 108 is configured to couple the main body 106 to the base 102. The first linkage assembly 108 is configured to enable or facilitate movement of the main body 106 relative to the base 102, this is achieved via lifting and tilting the main body 106 relative to the base 102. Lifting and tilting operations may be performed at the same time, or independently, depending on the requirement of the user and a user’s input. The mechanism 100 may comprise multiple first linkage assemblies 108, as shown in Figure 4. Returning to Figure 1, the first linkage assembly 108 comprises a hinge plate 122. The hinge plate 122 is connected to or integral with the base 102, such as at least one side 128 of the base 102. The hinge plate 122 provides at least one pivot point 124, such as a first pivot point 124a and second pivot point 124b. The first pivot point 124a is positioned towards an upper portion of the hinge plate 122, i.e., in the Z+ direction. The second pivot point 124b is arranged towards a lower portion of the hinge plate 122, i.e., in the Z- direction, or closer to the base 102. The first linkage assembly 108 further comprises at least one strut 126, such as a first strut 126a and a second strut 126b. The first linkage assembly 108 further comprises at least one attachment point 130 on the main body 106, such as a first attachment point 130a and a second attachment point 130b. The first strut 126a is attached to the first pivot point 124a and the first attachment point 130a and extends therebetween. The second strut 126b is attached to the second pivot point 124b and the second attachment point 130b and extends therebetween. The first attachment point 130a is located in an upper position i.e., in the Z+ direction, relative to the second attachment point 130b. As such, the first strut 126a is positioned in an upper position i.e., in the Z+ direction relative to the second strut 126b. In other words, the second strut 126b is located closer to the base 102, or the horizontal base plane B, compared with the first strut 126a. The second strut 126b is arranged substantially parallel to the base plane B. The first strut 126a is inclined relative to the base plane B, such that a front portion (in the X+ direction) of the second strut 126b is lower i.e., extends downwards into the Z- direction, compared with a rear portion (in the X- direction). In other words, from a rear end (X.) to front end (X+), the first strut 126a is inclined in a downwards (Z-) direction. The first and second struts 126a, 126b are rod-shaped elements having a fixed length. The length of the struts is selected to provide the optimal arc of movement for a user during a lifting and / or tilting operation. Movement of the main body 106 relative to the base 102 is restricted, limited, or otherwise constrained to an arc of movement that is defined by the first and second struts 126a, 126b according to their lengths. Figure 1 also shows a second linkage assembly 114 situated towards the front of the mechanism 100 i.e., in the X+ direction. The second linkage assembly 114 comprises a first support 116. The second linkage assembly 114 and first support 116 are configured to transition from the retracted state, shown in Figure 1, to an extended state as shown in Figure 6. When the second linkage assembly 114 is in the extended state, the second linkage assembly 114 and first support 116 extend the forward direction away from the main body 106 and base 102 of the mechanism 100, i.e., in the X+ direction. The second linkage assembly 114 comprises multiple link elements, and is more clearly shown in Figures 3-6. The mechanism 100 further comprises a third linkage assembly 138. The third linkage assembly 138 is situated towards the rear of the main body 106 i.e., in the X-direction. The third linkage assembly 138 provides a moveable connection between the main body 106 and a reclining portion 140. The reclining portion 140 is arranged to transition, via the operation of the third linkage assembly 138, between an upright and inclined configuration. The reclining portion 140 may incline away from the main body 106, such as in the X- direction, to provide a user with a reclined sitting arrangement. The third linkage assembly 138 comprises multiple individual linkage elements and also includes a connecting portion that extends between the third linkage assemblies 138 situated on opposite sides of the main body 106. The lifting and / or tilting operations of the main body 106 relative to the base 102 are facilitated by at least one actuator 136. Similarly, extension and retraction operations of the second linkage assembly 114 is facilitated by an actuator 136. An actuator 136 may comprise a motor, controller 144, and an actuating rod 137 or equivalent component that is configured to transfer the output of the motor to the relevant component of the mechanism 100, such as the first linkage assembly 108, and / or a second linkage assembly 114, and / or third linkage assembly 138. The view provided in Figure 1 shows a single third linkage assembly 138, however, the mechanism 100 comprises multiple actuators 136 that are configured to provide mechanical input to different elements of the mechanism 100, as shown in Figures 3 and 4. For example, a first actuator 136 may provide a mechanical input of the first linkage assembly 108. A second actuator 136 may provide a mechanical input to the second linkage assembly 114. A third actuator 136 may provide a mechanical input to the third linkage assembly 138. In some arrangements, a single actuator may provide a mechanical input to multiple linkage assemblies, such as the second and third linkage assemblies 114, 138. The combined actuation of these linkage assemblies 114, 138 enables a reclining operation of the mechanism 100. Figure 2 shows a front elevation of the chair mechanism 100 in an upright sitting configuration. In other words, Figure 2 provides a view of the mechanism 100 from the X+ direction facing towards the X- direction. Figure 2 shows the same components as described above, however, in this case the second support 120 is more clearly visible. When the mechanism 100 is in a retracted or upright sitting configuration, the second support 120 remains tucked or stowed behind the first support 116. The second support 120 is tucked or stowed between the main body 106 and the first support 116. This arrangement ensures that, when the mechanism 100 is utilised in a chair, the second support 120 is not visible when viewed externally, thereby providing a cleaner and tidier appearance. Figure 2 shows a mechanism 100 having first and second actuators 136a, 136b, with each actuator 136 being connected to different elements of the mechanism 100. This arrangement is more clearly shown in Figures 3 and 4 and is discussed in more detail below. Figure 3 shows a front upper left side perspective view of the chair mechanism 100 in an upright sitting configuration. As shown, the first linkage assembly 108 is be positioned internally relative to the main body 106 due to its attachment to the base 102. In other words, the main body 106 provides a larger footprint than the base 102. In other words, the first linkage assembly 108 may be positioned towards an interior of the mechanism 100, relative to the side portions of the main body 106. In Figure 3, the hinge plate 122 is shown to comprise two panels that attach to either side of the at least one side 128 of the base 102. These panels support the first and second pivot points 124a, 124b which are located in between the panels of the hinge plate 122. Figure 3 illustrates that the second linkage assembly 114 comprises a plurality of linkage elements which are connected to provide extension and retraction of the second linkage assembly 114 and associated first support 116 relative to the main body 106 and the base 102. Figure 3 also illustrates the arrangement of the first and second actuators 136a, 136b. The actuators are positioned towards the rear of the mechanism 100 i.e., towards the X-direction. The associated actuator rods 137 are arranged to extend towards a front of the mechanism 100 i.e., in the X+ direction. In the example shown in Figure 3, a first actuator 136a connects directly to a laterally extending element of the third linkage assembly 138. The first actuator 136a also connects to the second linkage assembly 114. Therefore, the first actuator 136a is arranged to provide a mechanical input to the second and third linkage assemblies 114, 138 simultaneously. The first actuator 136a is arranged such that a mechanical input can be applied to either the first or third linkage 114, 138 assemblies independently, or together. The second actuator 136b is connected to the main body 106 such that a mechanical input can be provided by the second actuator 136b to lift and / or tilt the main body 106 relative to the base 102. This is more clearly shown in Figures 4 and 5. The actuator rods 137 of the first and second actuators 136a, 136b are telescopic to provide the desired range of movement. The second actuator 136b is inclined or angled upwards from back to front to provide the necessary range of movement. Figures 4 and 5 show a front upper right side perspective view and a right-side elevation of the chair mechanism 100 when in a raised and tilted configuration. In this arrangement, the first actuator 136a is in a non-extended or retracted state. As such, the second linkage assembly 114 is in a retracted state, similarly, the third linkage assembly 138 is also in a retracted state. As illustrated, the second actuator 136b is in an active, extended state or partially extended state. The extension of the actuator rod 137 of the second actuator 136b provides the main body 106 with a mechanical input. This mechanical input causes the main body 106 to lift and / or tilt relative to the base 102 along an arc that is defined by the first and second struts 126a, 126b. As also shown in Figure 4, the mechanism 100 may comprise an additional first linkage assembly 108. The first and second first linkage assemblies 108 are positioned on opposite sides 128 of the base 102 and connect to opposite sides of the main body 106. Each of the first and second first linkage assemblies 108 comprises the same elements, namely, a hinge plate 122, first and second pivot points 124a, 124b, first and second struts 126a, 126b, and first and second attachment points 130a, 130b on the main body 106. This arrangement may improve the strength of the mechanism 100 and increase the weight tolerance of the mechanism 100. Figure 6 illustrates a right-side elevation of the chair mechanism 100 in a reclined configuration. In this configuration, the mechanical input from the first actuator 136a has acted upon the second linkage assembly 114 only, so as to cause the second linkage assembly 114 to extend outwards from the main body 106 in the forward direction i.e., in the X+ direction. In this arrangement, the reclining portion 140 is not in an extended state. Figure 6 provides a clear view of the sub-linkage assembly 118 and the second support 120. The sub-linkage assembly 118 is connected to the second linkage assembly 114 such that as the second linkage assembly 114 transitions from a retracted state to an extended state, the sub-linkage assembly 118 moves in concert with the second linkage assembly 114. The resulting movement of the sub-linkage assembly 118 causes an associated movement of the second support 120 from a retracted state to an extended state. The second support 120 moves from a position behind and / or below the first support 116 into a position in front of the first support 116. While in the extended state, the various link elements of the second linkage assembly 114 and sub-linkage assembly 118 are more clearly visible. When in a fully extended state, the second linkage assembly 114 and sub-linkage assembly 118 extended into the forward (X+ direction) at an upward incline i.e., include towards the Z+ direction. Figure 7 shows a block diagram for a chair mechanism 100. As illustrated, the mechanism 100 comprises an associated user input device 142. The user input device 142 is configured to receive an input from a user. For example, a user can input that the mechanism 100 is to lift and / or tilt, or that the mechanism 100 is to recline. The user’s input may be captured by the input device 142 and communicated to a controller 144. The controller is associated with at least one of the actuators 136. Each actuator 136a, 136b may comprise its own controller 144. The controller 144 is configured to translate the user’s input into a signal to direct the actuator to provide a mechanical input to its associated linkage assembly or assemblies 108, 114, 138 to provide the relevant extension or retraction operation. The controller(s) 144 and input device 142 may be linked directly, e.g., via a wire or cable, or remotely via a wireless communication. The skilled person will appreciate that various wireless communication means may be used for this purpose, such as Bluetooth®. The input device 142 or controller(s) 144 may comprise a memory (not shown) that is configured to store a user’s preferred seating positions, thereby allowing a user to quickly navigate to their preferred seating position. Reference in the specification to “an example”, “an embodiment”, “an aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the example is included in at least one example, but not necessarily in other examples. The various instances of the phrase “in one example” or similar phrases in various places in the specification are not necessarily all referring to the same example. In describing and claiming examples disclosed herein, the singular forms “a”, “an”, and “the” include plural references unless the context clearly dictates otherwise. While several examples have been described in detail, it is to be understood that the disclosed examples may be modified. Therefore, the foregoing description is to be considered non-limiting. It should be understood that the examples described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each example should typically be considered as available for other similar features or aspects in other examples. While one or more examples have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made.

Claims

1. A mechanism for a rise and recline chair, comprising:a base, comprising a plurality of leg attachment points that extend outwards from the base, wherein each leg attachment points is configured to provide an attachment point for a chair leg;a main body; anda first linkage assembly, configured to couple the main body to the base and enable the main body to lift and / or tilt relative to the base,wherein a bottom face of the base defines a horizontal base plane and the upper edges of the plurality of leg attachment points define a horizontal leg attachment plane,wherein the base plane is located below the leg attachment plane.

2. The mechanism of claim 1, wherein the plurality of leg attachment points are curved in an upward direction away from the base plane.

3. The mechanism of any preceding claim, further comprising a second linkage assembly that is configured to couple a first support to the main body, wherein the second linkage assembly is configured to transition the second linkage assembly and first support between an extended configuration and a retracted configuration.

4. The mechanism of claim 3, wherein the second linkage assembly further comprises a sub-linkage assembly and a second support, wherein the sub-linkage assembly is configured to couple the second support to the second linkage assembly and enable the sub-linkage assembly and second support to transition between an extended configuration and a retracted configuration according to / in concert with the extension or retraction of the second linkage assembly and first support.

5. The mechanism of claim 4, wherein when the second linkage assembly and sub-linkage assembly are in an extended configuration, the first and second supports are extended outwards away from the main body of the mechanism.

6. The mechanism of claim 5, wherein when the second linkage assembly and sub-linkage assembly are in an extended configuration, the first and second supports are configured to completely support a user’s legs and feet.

7. The mechanism of claim 4, wherein when the linkage assembly and sub-linkage assembly are in a retracted configuration, the second support is configured to stow between the first support and the main body of the mechanism.

8. The mechanism of claim 7, wherein when the linkage assembly and sub-linkage assembly are in a retracted configuration, the second support stows in a position above the horizontal leg attachment plane.

9. The mechanism of claim 7, wherein, when the second linkage assembly and sub-linkage are in a retracted configuration, the second support is not visible.

10. The mechanism of claim 4, wherein the second support is configured to extend further away from the main body of the mechanism than the first support.

11. The mechanism of any preceding claim, further comprising a hinge plate fixedly attached to the base and configured to provide at least one pivot point,at least one strut, configured to provide an attachment between the at least one pivot point of the hinge plate and the main body,wherein the at least one strut is further configured to limit the movement of the main body relative to the base.

12. The mechanism of claim 11, wherein the hinge plate is attached to the base at a substantially central position along at least one side of the base.

13. The mechanism of claim 11, wherein the hinge plate comprises:a first pivot point positioned in an upper portion of the hinge plate;a second pivot point positioned in a lower position of the hinge plate closer to a rear side of the base than a front side.

14. The mechanism of claim 13, wherein a first strut connects the first pivot point of the hinge plate to a first attachment point on the main body, anda second strut connects the second pivot point of the hinge plate to a second attachment point on the main body.

15. The mechanism of any preceding claim, further comprising at least one actuator configured to provide a mechanical input.

16. The mechanism of claim 15, wherein the actuator is configured to provide a mechanical input to:extend and / or retract the first linkage assembly; and / or extend and / or retract the second linkage assembly.

17. The mechanism of any preceding claim, wherein the main body further comprises a third 5 linkage assembly and a reclining portion, wherein the third linkage assembly is configured to change the inclination of the reclining portion relative to the main body to provide a reclining action.

18. The mechanism of claims 15 and 17, wherein the actuator is configured to provide a 10 mechanical input to extend and / or retract the third linkage assembly.

19. The mechanism of any preceding claim, wherein the mechanism comprises an input device and a controller, wherein the input device is configured to receive an input from a user and the controller is configured to control an actuator to provide movement according to the 15 user input.

20. A chair, comprising the mechanism of any preceding claim.

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