Adjustable bed

Abstract

A zero wall adjustable bed (10) comprising a base (12), a support carriage (19) slidably movable relative to the base (12), an actuator (26), a support platform (16) comprising a back support platform (18), a lower support platform (91), and a mattress bend support platform (21) positioned between the back support platform (18) and the lower support platform (20), when the back support platform (18) is moved between the lowered position and the raised position, the actuators effect coordinated pivotal movement between the mattress bend support platform (21) and the lower support platform (20) and between the mattress bend support platform (21) and the back support platform (18).

Description

[0001] The present invention relates to an adjustable bed, in particular to an adjustable bed for home furniture applications.

[0002] An adjustable bed particularly suitable for home furniture applications is described in WO2011 / 048384. The adjustable bed comprises a plurality of mattress support platforms, including a movable back support platform, a fixed seat support platform adjacent to the back support platform, a movable thigh support platform adjacent to the seat support platform, and a movable foot or calf support platform adjacent to and hinged to the thigh support platform. The back support platform and the thigh support platform are mounted relative to the base to allow angular adjustment of the relative position of the back support platform and the thigh support platform to change the configuration of the bed. A linear actuator is provided for moving each of the movable platforms to achieve angular adjustment of the bed.

[0003] One of the disadvantages associated with adjustable beds of the aforementioned type is that the angle of elevation (included angle) between the seat platform and the raised back support platform can cause significant operational problems for both the bed and the occupant. In most arrangements, the backrest will have an adjustment angle of up to 70 degrees, that is, the backrest can be raised up to 70 degrees from the imaginary horizontal plane of the bed to raise the occupant from a flat lowered or lying position to a raised position of up to a maximum of 70 degrees. In other arrangements, the maximum tilt angle may be slightly less, such as 50, 55 or 60 degrees, depending on the particular application, whether the bed is for home, nursing home or medical use.

[0004] In a modern home environment, mattress thicknesses of 12-18 inches are common, and 14-18 inches is more typical in the United States. The overall weight, stiffness, and rigidity of the mattress can place unacceptable loads on the operating mechanisms of the bed. For example, thicker, heavier mattresses can cause motor (actuator) malfunctions and reduce the life of the motor and mechanism. This is becoming increasingly important as the market is driven by customer demand for thicker mattresses. Electrically adjustable beds have been known to fail after short periods of use with mattresses of the aforementioned thicknesses. One way to overcome this problem is to use special, more flexible "ribbed" mattresses. However, this is not a practical solution for most applications.

[0005] Another problem associated with known designs is that the elevation angle between the seat and the raised back support platform is not ergonomically ideal because it does not allow the mattress to naturally wrinkle around the user's hip joints, so the user must constantly adjust their position as the back support platform moves between the lowered and raised positions.

[0006] It is also desirable that the adjustable bed not only be able to accommodate thicker mattresses and be able to operate more efficiently and ergonomically, but also have zero wall functionality, i.e., be able to maintain the position of the bed's occupant proximate to a wall against which the head end of the bed may be placed. This desirable functionality ensures that the occupant's position relative to adjacent bedside furniture, etc., is maintained when the bed is raised or lowered, and that the occupant's position relative to their surroundings is maintained even when the bed is adjusted to raise the occupant.

[0007] Another problem with known adjustable beds relates to the aesthetics of the bed itself, and in particular the visibility of the actuators and associated connections required to move the back support platform between the lowered and raised positions, since in addition to requiring a bed that provides adjustability and comfort, users also require an adjustable bed that does not have any negative impact on aesthetics.

[0008] It is an object of the present invention to provide an improved adjustable bed which overcomes or at least alleviates the above-mentioned problems associated with prior art adjustable beds.

[0009] Therefore, according to one aspect of the present invention, a zero-wall adjustable bed (10) is provided, which includes a base (12), a support carriage (19), an actuator (26), and a support platform (16), wherein the support carriage (19) is slidably movable relative to the base (12), and the support platform (16) includes a back support platform (18), a lower support platform (91), and a mattress bending support platform (21) positioned between the back support platform (18) and the lower support platform (20), and when the back support platform (18) moves between a lowered position and a raised position, the actuator realizes coordinated pivotal movement between the mattress bending support platform (21) and the lower support platform (20) and between the mattress bending support platform (21) and the back support platform (18).

[0010] Preferably, the lower support platform (91) includes at least one of a seat support platform (20), a thigh support platform (22) and a foot support platform (24).

[0011] Preferably, the seat support platform (20) is pivotally attached to the mattress flexure support platform (21), and the back support platform (18) is pivotally attached to the mattress flexure support platform (21), and when the back support platform (18) moves between a lowered position and a raised position, the actuator achieves coordinated pivotal movement between the mattress flexure support platform (21) and the seat support platform (20) and between the mattress flexure support platform (21) and the back support platform (18).

[0012] Preferably, a first angle (A1) is defined between the seat support platform (20) or the support slide (19) and the mattress bending support platform (21), and a second angle (A2) is defined between the mattress bending support platform (21) and the back support platform (18), wherein when the back support platform (18) moves between a lowered position and a raised position, a difference between the first angle (A1) and the second angle (A2) is less than 10 degrees.

[0013] Preferably, the first angle (A1) and the second angle (A2) are substantially equal when the back support platform (18) moves between the lowered position and the raised position.

[0014] Preferably, a third angle (A3) is defined between the seat support platform (20) or the support slide (19) and the back support platform (18), wherein when the back support platform (18) moves between the lowered position and the raised position, the third angle (A3) is between 0 degrees and 70 degrees, and preferably when the back support platform (18) is in the raised position, the third angle (A3) is less than 70 degrees.

[0015] Preferably, at least a portion of the support platform (16) is slidably secured to the support carriage (19).

[0016] Preferably, the seat support platform (20) is slidably secured to the support carriage (19).

[0017] Preferably, the pivot connection (695) between the lower support platform (691) and the mattress flex support platform (621) is slidably secured to the support carriage (619).

[0018] Preferably, the base (12) includes one of a mattress flex support platform guide (54) or a mattress flex support platform follower, and the mattress flex support platform (21) includes the other of the mattress flex support platform guide or the mattress flex support platform follower (56), so that when the back support platform (18) moves between the lowered position and the raised position, the relative movement between the mattress flex support platform guide (54) and the mattress flex support platform follower (56) causes coordinated pivotal movement between the mattress flex support platform (21) and the lower support platform (20) and between the mattress flex support platform (21) and the back support platform (18).

[0019] Preferably, the mattress flex support platform guide (54) slopes vertically upward and rearward toward the head end of the bed.

[0020] Preferably, the mattress curvature support platform guide (54) includes a straight portion, and preferably defines only a straight portion.

[0021] Preferably, the mattress curvature support platform guide includes a curved portion, preferably defines only a curved portion (354).

[0022] Preferably, the adjustable bed (510) further comprises a first connecting device (581) and a second connecting device (583), wherein the first connecting device (581) acts directly on the back support platform (518), and the second connecting device (583) acts directly on the mattress bending support platform or acts on a pivot point (584) connecting the back support platform (518) and the mattress bending support platform (521), so that the actuator (526) drives the two support platforms (521, 526) simultaneously, and the second connecting device (583) is driven by the actuator via the first connecting device (581), wherein the second connecting device (583) is pivotally attached to the first connecting device (581) midway along the first connecting device (581).

[0023] Preferably, the first connecting means has a first end pivotally attached to the support carriage (519) and a second end free to move in translation on the back support platform (518).

[0024] Preferably, the adjustable bed (510) further comprises a third connecting means (585) pivotally attached at a first end to the first connecting means (581) and pivotally attached at a second end to the base (512).

[0025] Preferably, the actuator (226) has a first end pivotally attached to the base (212) and a second end pivotally attached to the support carriage (219) such that movement of the actuator effects sliding movement between the support carriage (219) and the base (212).

[0026] Preferably, the actuator (526) has a first end pivotally attached to the third connecting device (585) and a second end pivotally attached to the support slide (519), so that movement of the actuator effects sliding movement between the support slide (519) and the base (512).

[0027] Preferably, the actuator slidably drives the support carriage.

[0028] Preferably, the support carriage (19) is slidably movable relative to the base (12) when the back support platform (18) moves between the lowered position and the raised position.

[0029] Preferably, movement of the back support platform (18) between the lowered position and the raised position causes the support carriage (19) to slide rearwardly towards the head end (H) of the bed.

[0030] Preferably, at least one (preferably all) of the foot support platform (24) or the foot support platform (24), the thigh support platform (22) or the thigh support platform (22), the back support platform (18) or the back support platform (18), and the mattress flexure support platform (21) or the mattress flexure support platform (21) can be pivoted relative to the seat support platform (20).

[0031] Preferably, the foot support platform (24) or the foot support platform (24) is pivotally connected to the thigh support platform (22) or the thigh support platform (22), and / or the thigh support platform (22) or the thigh support platform (22) is pivotally connected to the seat support platform (20) or the seat support platform (20), and / or the seat support platform (20) or the seat support platform (20) is pivotally connected to the mattress bending support platform (21) or the mattress bending support platform (21), and / or the mattress bending support platform or the mattress bending support platform is pivotally connected to the back support platform (18) or the back support platform (18).

[0032] Preferably, the foot support platform (24) or the foot support platform (24) is pivotally connected to the thigh support platform (22) and also includes a second actuator (44) which is configured to simultaneously cause the foot support platform (24) to slide and pivot relative to the seat support platform (20) and to cause the thigh support platform (22) to pivot upward relative to the seat support platform (20).

[0033] According to another aspect of the present invention, an adjustable bed (10) is provided, which includes a base (12), a support platform (16) and a second actuator (44), the support platform (16) including a foot support platform (24) and a thigh support platform (22) pivotally connected to the foot support platform (24), and a seat support platform (20), the second actuator (44) being configured to simultaneously cause the foot support platform (24) to slide and pivot relative to the seat support platform (20) and to cause the thigh support platform (22) to pivot upward relative to the seat support platform (20).

[0034] Preferably, the foot support platform (24) is slidable relative to the seat support platform (20) independent of relative movement between the support carriage (19) and the base (12) to which the seat support platform (20) is slidingly secured.

[0035] Preferably, rearward movement of the foot support platform (24) causes the foot support platform (24) to pivot upward relative to the seat support platform (20) and causes the thigh support platform (22) to pivot upward relative to the seat support platform (20).

[0036] Preferably, the bed further comprises a footboard (160) slidably secured to the support carriage (119), wherein movement of the support carriage (119) relative to the base (112) causes the footboard (160) to slidably move relative to the base (112).

[0037] According to another aspect of the present invention, an adjustable bed (110) is provided, which includes a base (112), a footboard (160), a support platform (116), an actuator (126), and a support slide (119), wherein the support platform (116) includes a back support platform (118) and a lower support platform (191), the actuator (126) being configured to move the support platform (116) relative to the base (12), and the support slide (119) being capable of slidably moving relative to the base (112), wherein movement of the support slide (119) relative to the base (112) causes the footboard (60) to slidably move relative to the base (112).

[0038] Preferably, the support platform (119) further comprises a mattress flexure support platform (121) positioned between the back support platform (118) and the lower support platform (191).

[0039] Preferably, the support carriage (119) is slidably movable relative to the base (112) when the back support platform (118) moves between the lowered position and the raised position.

[0040] Preferably, movement of the back support platform (118) between the lowered position and the raised position causes the footboard (160) to slidably move between the extended position and the retracted position.

[0041] Preferably, the back support platform (18) has a first end (28) adjacent to the other platform of the support platform (16) and a second end (30) adjacent to the headboard (14), wherein the actuator (26) is pivotally connected to the back support platform (18) at a point closer to the second end (30) than the first end (28).

[0042] Preferably, the back support platform (18) has a first end (28) adjacent to the other platform of the support platform (16) and a second end (30) adjacent to the headboard (14), wherein the actuator (26) is pivotally connected to the back support platform (18) at or near the second end (30).

[0043] Preferably, the headboard (14) includes a front side (32) facing the back support platform (18) and a back side (34) opposite to the front side (32), wherein the first actuator (26) is mounted on the back side (34).

[0044] Preferably, the front face (32) is substantially perpendicular to an upper surface (36) of the back support platform (18) when the back support platform (18) is in the lowered flat position or the lowered flat position.

[0045] Preferably, the longitudinal axis (L) of the first actuator (26) is arranged substantially vertically.

[0046] Preferably, the first actuator (26) is substantially contained within an envelope defined by a front face (32) of the headboard (14) and a rearmost face (38) of the headboard (14).

[0047] The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figures 1 to 3 is a perspective view of an adjustable bed according to one aspect of the present invention, with the back support platform in a flat lowered position and the foot support platform in a flat lowered position, Figure 4 , Figure 4a and Figure 5 yes Figure 1 A perspective view of an adjustable bed with the back support platform in a neutral position and the foot support platform in a flat lowered position, Figure 6 and Figure 7 yes Figure 1 A perspective view of an adjustable bed with the back support platform in a raised position and the foot support platform in a flat lowered position, Figure 8 yes Figure 1 side view of an adjustable bed with the back support platform in a raised position and the foot support platform in a raised position, Fig. 9 yes Figure 1 A perspective view of an adjustable bed with a back support platform in a raised position and a foot support platform in a raised position, Fig.10 yes Figure 1 side view of an adjustable bed with the back support platform in a raised position and the foot support platform in a raised position, Fig.11 yes Figure 1 A perspective view of an adjustable bed with a back support platform in a raised position and a foot support platform in a raised position, Fig.12 yes Figure 1 side view of an adjustable bed with the back support platform in a flat lowered position and the foot support platform in an intermediate position, Fig.13 yes Figure 1A perspective view of an adjustable bed with the back support platform in a flat lowered position and the foot support platform in an intermediate position, Fig.14 yes Figure 1 A perspective view of an adjustable bed with a back support platform in a neutral position and a foot support platform in a neutral position, Fig.15 is a perspective view of another adjustable bed with the back support platform in a flat lowered position, the foot support platform in a flat lowered position, and the footboard in a fully extended position, Fig.16 yes Fig.15 a side view of a bed with the back support platform in a flat lowered position, the foot support platform in a flat lowered position, and the footboard in a fully extended position, Fig.17 yes Fig.15 a perspective view of a bed with the back support platform in a fully raised position, the foot support platform in a flat lowered position, and the footboard in a fully retracted position, Fig.18 yes Fig.15 a side view of a bed with the back support platform in a fully raised position, the foot support platform in a flat lowered position, and the footboard in a fully retracted position, Fig.19 yes Fig.15 a side view of a bed with the back support platform in a flat lowered position, the foot support platform in a flat lowered position, and the footboard in a fully extended position, Fig. 20 yes Fig.15 a side view of a bed with the back support platform in a neutral position, the foot support platform in a flat lowered position, and the footboard in a partially retracted position, Fig.21 yes Fig.15 a side view of a bed with the back support platform in a fully raised position, the foot support platform in a flat lowered position, and the footboard in a fully retracted position, Fig. 22 yes Fig.15 a side view of a bed with the back support platform in a neutral position, the foot support platform in a neutral position, and the footboard in a partially retracted position, Fig.23 yes Fig.15 a side view of a bed with the back support platform in a fully raised position, the foot support platform in a fully raised position, and the footboard in a fully retracted position, Fig.24 is a perspective view of another adjustable bed with the back support platform in a flat lowered position. Fig.25 yes Fig.24 A perspective view of a bed with the back support platform in a raised position, Fig.26 yes Fig.24 An underside plan view of a bed with the back support platform in a raised position, Fig. 27 is a perspective view of another adjustable bed with the back support platform in an intermediate position between the flat lowered position and the raised position. Fig.28 yes Fig. 27 A perspective view of a bed with the back support platform in an intermediate position between the flat lowered position and the raised position, Fig.29 is a perspective view of another adjustable bed with the back support platform in the raised position. Fig.30 is a perspective view of another adjustable bed with the back support platform in a flat lowered position. Fig.31 yes Fig.30 A perspective view of a bed with the back support platform in a raised position, Fig.32 yes Fig.30 A partial perspective view of a bed with the back support platform in a raised position, Fig.33 yes Fig.30 A partial perspective view of a bed with the back support platform in an intermediate position between the flat lowered position and the raised position, Figure 34 to Figure 37 yes Fig.30 side view of a bed with the back support platform in a flat lowered position, an intermediate position, and a fully raised position, Fig.38 is a perspective view of another adjustable bed with the back support platform in a mid-position and Fig.39 yes Fig.38 Side view of the bed with the back support platform in a neutral position.

[0048] exist Figures 1 to 14 , an adjustable bed 10 includes a base 12 and a headboard 14 slidably fixed relative to the base 12. The base 12 includes a pair of parallel and spaced-apart side rails 13a, 13b fixed to an outer frame 15 of the base. The headboard 14 is fixed to the side rails 13a, 13b. The side rails 13a, 13b also define support carriage guides in the form of support carriage grooves 50a, 50b. The base 12 also includes a leg 17 positioned at the end of the bed 10 opposite the headboard 14.

[0049] The headboard 14 includes a substantially horizontal top rail 23a and bottom rail 23b, to which a plurality of upright adjacent panels 90 (four panels 90a, 90b, 90c, 90d in this embodiment) are secured. It can be seen that slots 72 are formed by gaps between adjacent panels 90a and 90b and panels 90c and 90d, the purpose of which will be described below.

[0050] The adjacent panels 90 define a front face 32 of the headboard 18 that faces the back support platform 14 and a back face 34 that is opposite the front face 32 .

[0051] The bed 10 also includes a support platform 16 in the form of a back support platform 18, a lower support platform 91, and a mattress flex support platform 21. The lower support platform 91 includes a seat support platform 20, a thigh support platform 22, and a foot support platform 24. The mattress flex support platform 21 is disposed between and adjacent the back support platform 18 and the seat support platform 20. Each platform 18, 20, 21, 22, 24 is secured to an associated frame 18a, 20a, 21a, 22a, 24a (at Figure 6 best seen in the drawing, where support platforms 18, 20, 21, 22, 24 have been removed).

[0052] The back support platform 18 has a first end 28 adjacent to the mattress flexure support platform 21 and a second end 30 adjacent to the headboard 14 .

[0053] The foot-supporting platform 24 comprises an additional frame 25 which is connected to a second actuator 44 via a connecting rod 27 .

[0054] The bed 10 includes a support carriage 19 to which a seat support platform 20 is slidably and pivotally secured so that the seat support platform 20 moves with the support carriage 19, as described below. Another bed may not include a fixed seat support platform, wherein the support carriage is slidably secured to another portion of the support platform, such as a pivotal connection between a mattress flex support platform and a thigh support platform.

[0055] The support carriage 19 includes a pair of side brackets 25a, 25b, on each of which a pair of support carriage followers in the form of support carriage rollers 52a, 52b are mounted. The support carriage rollers 52a, 52b cooperate and can slide in the support carriage grooves 50 to achieve relative sliding movement between the support carriage 19 and the base 12 (the support carriage grooves 50 are fixed to the base 12). It should be understood that the seat support platform 20 can slide relative to the base 12 by being fixed to the support carriage 19.

[0056] The foot support platform 24 also includes a foot support platform follower in the form of a roller 92 that is mounted in and slidable relative to the support carriage grooves 50a, 50b fixed to the base 12. It should be understood that the foot support platform 24 can slide in the support carriage grooves 50a, 50b due to actuation of the second actuator 44 via the connecting rod 27, or due to movement of the support carriage 19 under the operation of the first actuator 26. That is, the foot support platform 24 can slide relative to the seat support platform 20 independently of the relative movement between the support carriage 19 and the base 12.

[0057] Each platform 18, 20, 21, 22, 24 includes a pair of laterally spaced hinges 21a, 21b, 21c, 21d pivotally connecting each platform to an adjacent platform to allow relative pivotal movement between adjacent platforms.

[0058] The base 12 includes a pair of mattress flex support platform guides in the form of a pair of straight and angled U-shaped channel grooves 54 , each of which is secured to the side rails 13 a , 13 b of the base 12 .

[0059] The mattress bending support platform followers are provided in the form of rollers 56, each of which is fixed to the mattress bending support platform 21 via a bracket 53 and can slide in an inclined U-shaped channel groove 54 on the base 12. The U-shaped channel groove 54 is inclined vertically upward and backward toward the headboard 14, so that in the raised position of the back support platform 18, the mattress bending support platform followers 56 are vertically positioned above the support platform followers 52a, 52b ( Fig.11 ).

[0060] The relative movement between the rollers 56 and the grooves 54 coordinates the movement of the mattress flexion support platform 21 as the back support platform 18 moves between the lowered position and the raised position. In alternative embodiments, the coordinated movement between the adjacent platforms of the mattress flexion support platform 21 (i.e., the seat support platform 21 and the back support platform 18) can be achieved without using the guide 56 and follower 52 arrangement described above. For example, in Figure 6 In the embodiment, hinge 21d may be a limiting hinge for controlling the relative pivotal movement between the mattress bending support platform 21 and the back support platform 18, and hinge 21c may be a limiting hinge for controlling the relative pivotal movement between the mattress bending support platform 21 and the seat support platform 20.

[0061] The bed 10 includes a first actuator 26 having a body 29 mounted on the top rail 23a and the bottom rail 23b of the headboard 14. The slider 31 is slidably mounted for movement within the body 29 of the first actuator 26. Therefore, it will be understood that the first actuator 26 is mounted on the back side 34 of the headboard 14, although indirectly via the top rail 23a and the bottom rail 23b directly mounted on the headboard panel 90. In an alternative embodiment, the first actuator 26 can be directly mounted on the headboard panel 90. The first actuator in this embodiment is an electric linear actuator. In an alternative embodiment, the first actuator can be a gas strut.

[0062] The bed 10 includes connection means in the form of an actuator connection means in the form of a substantially horizontal actuator cross member 78, and back support platform connection means in the form of a pair of spaced apart actuator side brackets 80 secured at each end of the actuator cross member 78. The actuator side brackets 80 are pivotally connected to the back support platform 18 via fixed brackets 79. The slide 31 is secured to the horizontal actuator cross member 78 such that movement of the first actuator 26 causes the horizontal actuator cross member 78 to move.

[0063] exist Figures 1 to 4 As can be seen in FIG. 1 , each actuator-side bracket 80 extends through the slot 72 and is vertically movable under operation of the actuator 26 , as will be described below.

[0064] It can also be seen that the first actuator 26 is pivotally connected to the back support platform 18 via a connection arrangement in the form of a horizontal actuator cross member 78, an actuator side bracket 80 and a fixed bracket 79, and the back support platform 18 is adjacent and proximate to the headboard 14 at the second end 30 of the back support platform 18. Although the first actuator 26 operates most efficiently when the pivot connection is located at or near the second end 30 of the back support platform 18, it is still advantageous from an actuator efficiency perspective to position the pivot connection closer to the second end 30 than the first end 28.

[0065] The bed 10 includes a track assembly in the form of a pair of U-shaped channel track members 76 mounted on the back side 34 of the headboard 14. A pair of rollers (not shown) on each actuator side bracket 80 cooperate and slide within the U-shaped channel track members 76 to achieve relative guided vertical sliding movement therebetween.

[0066] exist Figure 4 and Figure 4a As can be seen in FIG. 1 , the coupling devices 78 , 80 drivingly couple the first actuator 26 to the back support platform 18 , as will be described below.

[0067] exist Figure 3and Figure 4 , when the back support platform 18 is in the lowered or flat position, the longitudinal axis L of the actuator body 29 is substantially perpendicular to the upper surface 36 of the back support platform 18. It can also be seen that the actuator body is substantially vertical. In alternative embodiments, the actuator can be arranged horizontally or obliquely on the headboard so that the actuator side bracket 80 can move vertically and move the back support platform 18 between the lowered position and the raised position, so long as a suitable transmission device is provided between the actuator and the actuator side bracket 80.

[0068] exist Figure 3 It can also be seen in the drawings that the actuator 26 is not only mounted on the back side 34 of the headboard 14, but is substantially contained within an envelope defined by the front side 32 of the headboard 14 and the rearmost side 38 of the headboard 14. This is important both aesthetically and functionally because it enables the actuator 26 to be hidden if an additional rear panel (not shown) is added to the headboard or if the headboard is positioned against a wall (not shown).

[0069] The operation of the adjustable bed 10 is as follows: exist Figures 1 to 3 , the bed 10 is shown with the foot support platform 24 in the flat lowered position and the back support platform 18 in the flat lowered position.

[0070] Actuation of the actuator 26 in the upward direction causes the slide block 31 to slide vertically upward and causes the horizontal actuator cross member 78 , which is guided in the U-shaped channel rail component 76 , to slide vertically upward.

[0071] When the horizontal actuator cross member 78 slides vertically upward, the actuator side bracket 80 fixed to the horizontal actuator cross member 78 and pivotally connected to the back support platform 18 causes the back support platform 18 to move from Figures 1 to 3 The lowered position moves to Figure 4 and Figure 5 The middle position shown. Figure 1 and Figure 5 It can be seen from the comparison of FIG. 1 and FIG. 2 that when the back support platform 18 is raised, the support slide 19 and the support platform 16 fixed to the support slide 19 are simultaneously pulled backward in the direction of arrow R toward the headboard 14.

[0072] Actuating actuator 26 in the reverse downward direction moves back support platform 18 toward the lowered flat position and simultaneously in a direction aligned with arrow R ( Figures 1 to 3 ) push the support platform 16 away from the headboard.

[0073] It should be appreciated that the movement of the support platform 16 enables a user or occupant sitting or lying on the bed to maintain position relative to furniture such as a nightstand (not shown) as the back support platform 18 is raised and lowered. This functionality is referred to as zero wall functionality, or as a wall hugger bed or bed close to a wall.

[0074] Further activation of the actuator 26 in the upward direction causes the back support platform 18 to move from Figure 4 and Figure 5 Move to the middle position of Figure 6 and Figure 7 In the raised position, it can be seen that the support slide 19 and the support platform 16 fixed to the support slide 19 are simultaneously pulled further back in the direction of arrow R towards the headboard 14.

[0075] The relative movement between the rollers 56 and the grooves 54 coordinates the movement of the mattress flex support platform 21 relative to the seat support platform 20 and the back support platform 18 as the back support platform 18 moves between the lowered position and the raised position. Fig.10 It can be seen that the angle A3 is defined by the plane Ps defined by the seat support platform 20 and the plane P defined by the back support platform 18. B In this embodiment, in the raised position, the maximum inclination angle A3 of the back support panel 18 relative to the seat support platform 20 is 70 degrees. This maximum inclination angle A3 can be smaller, such as a maximum of 65 degrees, 60 degrees, 55 degrees, 50 degrees or less.

[0076] Importantly, the effect of this maximum inclination angle A3 on the bed, the mattress (not shown) used on the bed (and supported by the support platform) and the occupant of the bed can be mitigated by providing the mattress curved support platform 21 and, in particular, ensuring that the plane P defined by the seat support platform 20 is in a straight line when the back support platform 18 is moved in both directions between the lowered position and the raised position. s and the plane P defined by the mattress bending support platform 21 M The first angle A1 between the plane P defined on the mattress bending support platform 21 M and the plane P of the back support platform 18 B The second angle A2 therebetween remains substantially the same.

[0077] In an alternative embodiment, the difference between the first angle A1 and the second angle A2 is maintained at less than 10 degrees as the back support platform 18 moves between the lowered position and the raised position.

[0078] When the back support platform 18 moves between the lowered position and the raised position, the provision of the straight groove 54 coordinates the pivotal movement between the mattress bending support platform 21 and the seat support platform 20 and between the mattress bending support platform 21 and the back support platform 18, and ensures that the first angle A1 and the second angle A2 are substantially equal or at least differ by less than 10 degrees.

[0079] In addition to moving the back support platform 18 between the raised position and the lowered position by the first actuator 26, and the corresponding simultaneous movement of the support slide 19 together with the support platform 16, the second actuator 44 can slide the foot support platform 24 forward toward the headboard 14 and backward away from the headboard 14 independently of the movement of the support slide 19.

[0080] exist Figures 8 to 11 , it can be seen that the second actuator 44 has pulled the foot support platform 24 backwards towards the headboard 14. As the foot support platform 24 slides backwards, the second actuator 44 pivots upwards. At the same time, the thigh support platform 22 also pivots upwards. When the actuator 44 retracts towards the headboard 14 and directly pulls the attachment frame 25 of the foot support platform 24 via the connecting tie rod 27, since the thigh support platform 22 is hingedly connected to the seat support platform 20 (the second actuator 44 is fixed to the seat support platform 20) and the foot support platform 24 is hingedly connected to the thigh support platform 22, both the foot support platform 24 and the thigh support platform 22 pivot upwards.

[0081] By comparison Figures 8 to 11 a foot support platform 24 in a raised position, and Figure 6 and Figure 7 By illustrating the foot-support platform in a lowered, flat position in the figure, it can be seen that back support platform 18 can be raised or lowered, or any position between the raised position and the lowered position, regardless of the position of foot support platform 24. That is, back support platform 18 can be in a raised position, a lowered position, and any intermediate position, and in any of these positions, foot support platform 24 can be in a raised position, a lowered position, and any intermediate position.

[0082] Just as an additional example, Fig.12 and Fig.13 The bed 10 is shown with the back support platform 18 in a flat lowered position and the foot support platform 24 in an intermediate position, and Fig.14 The bed is shown with the back support platform 18 in a neutral position and the foot support platform 24 in a neutral position. It should be understood that Figures 1 to 14 The bed is a zero wall bed, ie, raising the back support platform pulls the support carriage, and therefore the seat support platform mounted on the support carriage, rearwardly toward the headboard.

[0083] Figures 15 to 23 Another adjustable bed 110 is shown. Figures 1 to 15 The beds are the same as in the previous examples, except for the differences marked below.

[0084] The bed 110 includes a movable footboard 160 that slidably moves relative to the base 112 when the support carriage 119 moves relative to the base 112. The side brackets 125a, 125b extend to fixedly connect the support carriage 119 to the footboard 160. The footboard 160 includes wheels 139 to enable the footboard 160 to slide on the surface on which the bed 110 stands.

[0085] The single support carriage groove 50a, 50b on each side rail 113a, 113b of the base 112 is replaced by two support carriage cams in the form of grooves 151a, 151b fixed to each guide side rail 113a, 113b of the base 112. Followers in the form of rollers 152a and 152b are fixed to the support carriage 119, and when the support carriage 119 slides relative to the base 112, the followers slide in the corresponding support carriage grooves 151a, 153a and 151b and 153b instead of sliding in a single support carriage groove 50a, 50b on each side rail 113a, 113b.

[0086] The operation of bed 110 is the same as that of bed 10, except that when the supporting slide 119 slides relative to the base 112 under the operation of the first actuator 126, the side brackets 125a, 125b also move relative to the base 112, and the side brackets 125a, 125b move the footboard 160 relative to the base 112 by being fixed to the footboard 160.

[0087] The operation of the first actuator 126 causes the back support platform 118 to be in the lowered position ( Fig.15 , Fig.16 and Fig.19 ) towards the middle position ( Fig.17 and Fig. 20 ) and raised position ( Fig.18 and Fig.21 )

[0088] By comparison Fig.19 , Fig. 20 and Fig.21 It can be seen that when the back support platform 118 moves from the lowered flat position to the raised position, the footboard 160 is pulled toward the headboard 114 in the direction of arrow R because the back support platform 118 pulls the support slide 119 fixedly connected to the footboard 160.

[0089] exist Fig.19 , the back support platform 118 is in a flat lowered position and the footboard 160 is in a fully extended position.

[0090] exist Fig. 20 , the back support platform 118 is in a neutral position and the footboard 160 is in a partially retracted position.

[0091] exist Fig.21 , the back support platform 118 is in the fully raised position and the footboard 160 is in the fully retracted position.

[0092] Fig. 22 The back support platform 118 is shown in an intermediate position, with the footboard 160 in a partially retracted position and the foot support platform 118 in an intermediate position between the lowered position and the fully raised position.

[0093] Fig.23 The back support platform 118 is shown in a fully raised position, with the footboard 160 in a fully retracted position, and the foot support platform 124 in a fully raised position.

[0094] It should be understood that in the bed 110, the back support platform 118 can be in a raised position, a lowered position, and any intermediate positions, with the footboard 160 in respective extended, partially retracted, and fully retracted positions, and as in Figures 1 to 14 In the bed 10, in any of those back support platform positions, the foot support platform 124 can be in a raised position, a lowered position, and any intermediate positions.

[0095] It will also be understood that although Figures 15 to 23 In the embodiment of the present invention, the back support platform 118 is raised and lowered by pulling the first actuator 126 of the footboard 160 rearwardly, but in alternative embodiments, the footboard itself or direct actuation of the support carriage can pull the footboard so that the back support platform is raised by means of the support carriage directly or indirectly hingedly connected to the seat support platform 20 fixed thereto. In other words, under operation of the actuator, any relative movement between the base and the support carriage causes the footboard to move relative to the base.

[0096] In another embodiment, movement of the first actuator can cause an additional component (not shown) to move between the first position and the second position. For example, the additional component is a display screen, such as a television or projector screen (not shown) housed in the footboard, and movement of the actuator can automatically or selectively move the display screen between the raised position and the lowered position.

[0097] Fig.24 (back support panel 218 in lowered position) and Fig.25 and Fig.26 (back support panel 218 is in raised position) Another bed 210 is shown. The bed 210 is similar to the bed 210 described above except as follows. Figures 1 to 14 The bed 10 described is the same.

[0098] The actuator 226 is not mounted on the headboard in a vertical orientation. Instead, the actuator 226 is mounted substantially horizontally, with a first end fixed to the base 212 of the bed 210 and a second end fixed to the seat support platform 220.

[0099] In place of an actuator-side bracket 80 drivingly connecting the back support panel 18 to the actuator 26 in the bed 10, the bed 210 includes a pair of arms 280 pivotally connected at each end to the back support platform 218 and the base 212, respectively, so that movement of the actuator 226 can move the back support platform 18 between a lowered position and a raised position.

[0100] The operation of the bed 210 is the same as the bed 10 , except that the actuator 226 is mounted on the base 212 of the bed to enable relative sliding movement between the support slide 219 and the base 212 to raise and lower the back support platform 218 .

[0101] It should be understood that in the above-described beds 10, 110, since the actuator 26, 126 is directly connected to the back support platform 18, 118, the actuator 26, 126 directly raises and lowers the back support platform 18, 118. When the back support platform 18, 118 is raised or lowered, the support slide 19, 119 slides relative to the base 12, 112, and the seat support platform 20, 120 is slidably fixed to the support slide 19, 119, i.e., the seat support platform 20, 120 cannot slide relative to the support slide 19, 119, so that any sliding movement of the seat support platform 20, 210 is converted into a sliding movement of the support slide 19, 119.

[0102] In contrast, the actuator 226 in the bed 210 is directly connected to the seat support platform 220, and thus the actuator 226 causes the support slide 219 to slide relative to the base 212. As the support slide 219 slides relative to the base 212, the platform 218 is raised or lowered due to the indirect connection between the support slide 219 and the back support platform 218 via the pivot connection between the back support platform 218, the mattress flex support platform 221, and the seat support platform 220, to which the seat support platform 220 is slidably fixed.

[0103] Fig. 27 and Fig.28 Another bed 310 is shown that is the same as the bed 210 described above, except that the mattress flex support platform guide 354 is completely curved rather than straight. The provision of the curved mattress flex support platform guide 354 further improves the coordinated pivoting movement between the mattress flex support platform 321 and the seat support platform 320 and between the mattress flex support platform 321 and the back support platform 318 when the back support platform 318 moves between the lowered position and the raised position, and ensures that the first angle and the second angle are substantially equal or at least differ by less than 10 degrees.

[0104] In alternative embodiments of the bed 10, 110, 210, 310, the mattress curved support platform guide may include a curved portion and a straight portion.

[0105] It should be understood that in any of the above-mentioned beds, Figures 1 to 23 In a bed with a 100 mm diameter, the actuator is mounted on the headboard, or Figure 24 to Figure 28 In a bed in which the actuator is mounted on a base, the mattress curvature support platform guide may be a fully curved or straight guide, or include both curved and straight portions.

[0106] Fig.29 Another bed 410 is shown. Figures 15 to 23 4 is the same as the bed 110 of 1900, except that the actuator 426 is mounted horizontally (rather than vertically) and attached to the headboard 414. In an alternative embodiment, the actuator may be attached to the base, as described in bed 210. It should be understood that the actuator need not be attached to the headboard, and may be attached to any portion of the bed that slides relative to the support carriage, such that movement of the actuator causes the support carriage to slide relative to the base of the bed and raise and lower the back support platform.

[0107] Figures 30 to 37 Another bed 510 is shown (with the legs removed) that uses a different mechanism to coordinate the pivotal movement between the mattress flex support platform 521 and the lower support platform 520, and between the mattress flex support platform 521 and the back support platform 518 as the back support platform 518 moves between the lowered position and the raised position.

[0108] Bed 510 is similar to bed 210 except as described below.

[0109] Bed 510 does not use mattress flexure support platform guides and followers to coordinate mattress flexure support platform movement.

[0110] Alternatively, the bed 510 includes a first connecting device in the form of a pair of first connecting arms 581, the first ends of the first connecting arms 581 being pivotally connected to the support slide 519, and the second ends of the first connecting arms 581 include rollers 582, which act on the back support panel 518 and move translationally relative to the back support panel to raise and lower the back support panel as described below.

[0111] The bed 510 also includes a second connecting device in the form of a pair of second connecting arms 583, each of which is pivotally connected at a first end midway along the first connecting arm 581 and is pivotally connected at a second end to a pivot connection or hinge point 584 between the mattress flex support platform 521 and the seat support platform 520 (note that the seat support platform 520 includes two articulated portions for storage purposes, each portion remaining fixed relative to the other portion during operation of the bed).

[0112] In an alternative embodiment, the second connection means may act directly on the mattress flexure support platform, rather than on the pivot point connecting the back support platform and the mattress flexure support platform.

[0113] The bed 510 also includes a third connection means in the form of a pair of third connection arms 585, wherein a first end of each connection arm 585 is pivotally attached to the first connection arm 581 midway along the first connection arm 581. A second end of each third connection arm 585 is pivotally attached to the base 512.

[0114] The actuator 526 has a first end pivotally attached to a cross member 586 connecting a pair of third connecting arms 585 and a second end pivotally attached to the base 512. In an alternative embodiment, the first end of the actuator 526 can be connected to the base 512 and the second end pivotally attached to the support carriage 519.

[0115] The operation of bed 510 is as follows: Actuator 526 is directed toward the head end of the bed (when viewing Figure 35 to Figure 37 Actuation of the third connecting arm 585 causes the third connecting arm 585 to rotate clockwise (when viewing the left) about the pivot connection on the base 512 Figure 35 to Figure 37). When the arm 585 rotates clockwise, the first connecting arm 581 rotates counterclockwise, pulling the support carriage 519 backward toward the head end of the bed. At the same time, the roller 582 moves translationally and acts on the back support platform 518 to rotate the back support platform 518 from the lowered position to the raised position. When the support carriage 519 moves backward as the back support panel 518 is raised, the first connecting arm 581 causes the second connecting arm 585 to act on the mattress bending support platform 521. Therefore, it should be understood that the actuator 526 simultaneously drives the back support platform 518 and the mattress bending support platform 521, wherein the first connecting arm 581 acts directly on the back support platform 521, and the mattress bending support platform 521 is driven by the second connecting arm 582 via the first connecting arm 581.

[0116] Actuation of actuator 526 in the opposite direction lowers back support platform 518 and pushes support carriage 519 away from the head end of the bed toward the foot end of the bed.

[0117] During movement of the back support platform 518 between the lowered position and the raised position, instead of coordinating the movement of the mattress flexure support platform relative to the seat support platform and the back support platform as a back support platform by relative movement between the rollers 56 and the grooves 54 as described above with respect to the beds 10, 110, 210, 310, 410, the coordinated movement is achieved by the actuator 526 driving the first connection device 581 and the second connection device 583. The result of this coordinated movement is similar to that described with respect to Fig.10 The same as described above, wherein when the back support platform 218 moves between the lowered position and the raised position, the plane Ps defined by the seat support platform 220 and the plane P defined by the mattress curved support platform 221 are M The first angle A1 between the two and the plane P defined on the mattress bending support platform 221 M and the plane P of the back support platform 218 B In an alternative embodiment, the difference between the first angle A1 and the second angle A2 remains substantially equal when the back support platform 218 moves between the lowered position and the raised position.

[0118] Fig.38 Another bed 610 is shown (with legs removed) and Figures 30 to 376 is similar to bed 510 except that lower support platform 691 includes only thigh support platform 622 and foot support platform 624 and does not have a fixed seat support platform. Pivot connection 695 between thigh support platform 622 and mattress flex support platform 621 is fixed to support carriage 619 so that lower support panel 691 slidingly moves with support carriage 619. Bed 610 differs from bed 510 in that foot support platform 624 is raised by a different actuator.

[0119] The operation of bed 610 is the same as bed 510, except that the second angle A2 is defined between the mattress bending support platform 621 and the plane P defined by the support carriage 619. s between.

[0120] It should be understood that in all of the above-described beds 10-610, movement of the support platform enables a user or occupant sitting or lying on the bed to maintain position relative to furniture such as a nightstand (not shown) as the back support platform is raised and lowered. This functionality is referred to as zero wall functionality, or as a bed that is close to a wall or a bed that is close to a wall.

[0121] Referenced above Figures 1 to 39 Various features are described in the bed described in the accompanying drawings. It should be understood that some of these features are not necessarily limited to the specific embodiments in which they have been illustrated.

[0122] For example, a first actuator mounted on the headboard, or arranged substantially vertically, or positioned to be pivotally connected at or near the second end, need not be limited to beds with a movable footboard. Similarly, beds with a movable footboard need not be limited to actuators mounted on the headboard, or arranged substantially vertically, or positioned to be pivotally connected at or near the second end. Furthermore, the sliding and pivoting foot support platform need not be limited to the aforementioned actuator locations or beds with a movable footboard.

Claims

1. A zero-wall adjustable bed (10), comprising a base (12), a support slide (19), an actuator (26), and a support platform (16), wherein the support slide (19) is capable of slidingly moving relative to the base (12), the support platform (16) comprising a back support platform (18), a lower support platform (91), and a mattress bending support platform (21) positioned between the back support platform (18) and the lower support platform (20), and when the back support platform (18) moves between a lowered position and a raised position, the actuator realizes coordinated pivoting movement between the mattress bending support platform (21) and the lower support platform (20) and between the mattress bending support platform (21) and the back support platform (18).

2. The zero-wall adjustable bed (10) according to claim 1, wherein: The lower support platform (91) includes at least one of a seat support platform (20), a thigh support platform (22) and a foot support platform (24).

3. The zero-wall adjustable bed (10) according to claim 2, wherein: The seat support platform (20) is pivotally attached to the mattress bending support platform (21), and the back support platform (18) is pivotally attached to the mattress bending support platform (21), and when the back support platform (18) moves between a lowered position and a raised position, the actuator achieves coordinated pivotal movement between the mattress bending support platform (21) and the seat support platform (20) and between the mattress bending support platform (21) and the back support platform (18).

4. A zero-wall adjustable bed (10) according to any one of the preceding claims, wherein a first angle (A1) is defined between the seat support platform (20) or the support slide (19) and the mattress bending support platform (21), and a second angle (A2) is defined between the mattress bending support platform (21) and the back support platform (18), wherein when the back support platform (18) moves between a lowered position and a raised position, the difference between the first angle (A1) and the second angle (A2) is less than 10 degrees.

5. The zero-wall adjustable bed (10) according to claim 4, wherein: When the back support platform (18) moves between a lowered position and a raised position, the first angle (A1) and the second angle (A2) are substantially equal.

6. The zero-wall adjustable bed (10) according to any one of the preceding claims, a third angle (A3) being defined between the seat support platform (20) or the support carriage (19) and the back support platform (18), wherein: When the back support platform (18) moves between the lowered position and the raised position, the third angle (A3) is between 0 degrees and 70 degrees. Preferably, when the back support platform (18) is in the raised position, the third angle (A3) is less than 70 degrees.

7. A zero-wall adjustable bed (10) according to any one of the preceding claims, wherein: At least a portion of the support platform (16) is slidably fixed to the support carriage (19), so that the support platform (16) can slide relative to the base (12).

8. The zero-wall adjustable bed (10) according to claim 7, wherein: The seat support platform (20) is slidably fixed to the support carriage (19).

9. The zero-wall adjustable bed (610) according to claim 7, wherein: A pivot connection (695) between the lower support platform (691) and the mattress flex support platform (621) is slidably secured to the support carriage (619).

10. An adjustable bed (10) according to any one of the preceding claims, wherein The base (12) includes one of a mattress bending support platform guide (54) or a mattress bending support platform follower, and the mattress bending support platform (21) includes the other of the mattress bending support platform guide or the mattress bending support platform follower (56), so that when the back support platform (18) moves between a lowered position and a raised position, relative movement between the mattress bending support platform guide (54) and the mattress bending support platform follower (56) causes coordinated pivotal movement between the mattress bending support platform (21) and the lower support platform (20) and between the mattress bending support platform (21) and the back support platform (18).

11. The adjustable bed (10) according to claim 10, wherein: The mattress curvature support platform guide (54) slopes vertically upward and rearward toward the head end of the bed.

12. The adjustable bed (10) according to claim 10 or 11, wherein: The mattress curvature support platform guide (54) includes a straight portion, and preferably defines only a straight portion.

13. The adjustable bed (310) according to claim 11, wherein: The mattress curvature support platform guide includes a curved portion, preferably defines only a curved portion (354).

14. The adjustable bed (510) according to any one of claims 1 to 9, further comprising a first connecting device (581) and a second connecting device (583), wherein the first connecting device (581) acts directly on the back support platform (518), and the second connecting device (583) acts directly on the mattress bending support platform or acts on a pivot point (584) connecting the back support platform (518) and the mattress bending support platform (521), so that the actuator (526) drives the two support platforms (521, 526) simultaneously, and the second connecting device (583) is driven by the actuator via the first connecting device (581), wherein the second connecting device (583) is pivotally attached to the first connecting device (581) midway along the first connecting device (581).

15. The adjustable bed (510) according to claim 14, wherein: The first connecting means has a first end pivotally attached to the support carriage (519) and a second end free to move in translation on the back support platform (518).

16. The adjustable bed (510) of claim 14 or 15, further comprising a third connection means (585) pivotally attached to the first connection means (581) at a first end and pivotally attached to the base (512) at a second end.

17. The adjustable bed (210) according to any one of the preceding claims, wherein: The actuator (226) has a first end pivotally attached to the base (212) and a second end pivotally attached to the support carriage (219) such that movement of the actuator effects sliding movement between the support carriage (219) and the base (212).

18. The adjustable bed (10) according to claim 16, wherein: The actuator (526) has a first end pivotally attached to the third connecting device (585) and a second end pivotally attached to the base (512), so that movement of the actuator effects sliding movement between the support carriage (519) and the base (512).

19. An adjustable bed according to any one of the preceding claims, wherein: The actuator slidably drives the support carriage.

20. The adjustable bed (10) according to any one of the preceding claims, wherein The support carriage (19) is slidably movable relative to the base (12) when the back support platform (18) moves between the lowered position and the raised position.

21. An adjustable bed (10) according to any one of the preceding claims, wherein: Movement of the back support platform (18) between the lowered position and the raised position causes the support carriage (19) to slide rearwardly towards the head end (H) of the bed.

22. An adjustable bed (10) according to any one of the preceding claims, wherein At least one, and preferably all, of the foot support platform (24) or the foot support platform (24), the thigh support platform (22) or the thigh support platform (22), the back support platform (18) or the back support platform (18), and the mattress flexure support platform (21) or the mattress flexure support platform (21) are capable of pivoting relative to the seat support platform (20) and / or relative to the support slide (19).

23. An adjustable bed (10) according to any one of the preceding claims, wherein: The foot support platform (24) or the foot support platform (24) is pivotally connected to the thigh support platform (22) or the thigh support platform (22), and / or the thigh support platform (22) or the thigh support platform (22) is pivotally connected to the seat support platform (20) or the seat support platform (20), and / or the seat support platform (20) or the seat support platform (20) is pivotally connected to the mattress bending support platform (21) or the mattress bending support platform (21), and / or the mattress bending support platform or the mattress bending support platform is pivotally connected to the back support platform (18) or the back support platform (18).

24. The adjustable bed (110) according to any of the preceding claims, further comprising a footboard (160) slidably secured to the support slide (119), wherein movement of the support slide (119) relative to the base (112) causes the footboard (160) to slidably move relative to the base (112).

25. An adjustable bed (110), comprising a base (112), a footboard (160), a support platform (116), an actuator (126) and a support slide (119), wherein the support platform (116) comprises a back support platform (118) and a lower support platform (191), the actuator (126) being configured to move the support platform (116) relative to the base (12), the support slide (119) being capable of slidably moving relative to the base (112), wherein movement of the support slide (119) relative to the base (112) causes the footboard (160) to slidably move relative to the base (112).

26. The adjustable bed (110) according to claim 25, wherein The support platform (119) further comprises a mattress flexure support platform (121), wherein the mattress flexure support platform (121) is positioned between the back support platform (118) and the lower support platform (191).

27. The adjustable bed (110) according to any one of claims 24 to 26, wherein: The support carriage (119) slidably moves relative to the base (112) when the back support platform (118) moves between a lowered position and a raised position.

28. The adjustable bed (110) according to claim 27, wherein Movement of the back support platform (118) between the lowered position and the raised position causes the footboard (160) to slidably move between an extended position and a retracted position.

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