a.
The present invention relates to an article of adjustable furniture such as a chair or a bed, and in particular concerns adjustable furniture having one or more adjustable support sections which can be moved to adjust the configuration of the furniture.
Known articles of adjustable furniture comprise complex mechanisms driven by one or more actuators between different configurations. US2002/0174487 discloses a hospital bed having adjustable back and thigh sections for supporting the occupant in various positions, for example in a flat horizontal position, in a recumbent or semi-recumbent position or simply with the backrest raised. The hospital bed of US2002/0174487 comprises a frame having a pair of parallel and spaced apart first and second side frame members; a mattress support deck including an adjustable back; a fixed seat section located adjacent to the back section; and, an adjustable thigh section located adjacent to the seat section. The thigh section is movable longitudinally relative to the seat section, to increase the length of the thigh section as it is raised relative to the frame. First and second curved tubes are coupled to respective first and second sides of the back section. A plurality of rollers are coupled to the first and second side frame members, with the rollers being configured to support the first and second curved tubes to permit movement of the curved tubes and the backrest section relative to the frame. A linear actuator is disposed beneath the back rest section and coupled to the first and second tubes to move the back rest section from a horizontal position to an elevated position relative to the frame. Two concentric arcuate tubes are provided on each side of the bed which have a radius of curvature centered on a location which emulates the natural hip pivot of a person lying on the mattress of the bed. The tubes are secured between three rollers on each side of the bed. Two rollers are located on a bottom side of the radially outer tube, that is to say radially outwards thereof, and the third roller is located on a top side of the radially inner tube. Cross-members extend between the tubes. The arrangement provides a so called shear-less pivot mechanism in which the adjustable back section pivots about 30 the natural hip point of the person on the bed.
The arrangement disclosed in US2002/0174487 may be considered heavy, robust and mechanically complex.
In a modern domestic setting, where mattress thicknesses of 12 to 18 inches are common, and more typically 14 to 18 inches in the United States, the overall weight, stiffness and rigidity of the mattress can place an unacceptable load on the operating mechanism of the bed, for example thicker, heavier mattresses can cause the motor (actuator) to struggle and reduce the longevity of the motor and mechanism. This is becoming increasingly relevant as the market place is driven by customer demand for thicker mattresses. Motorized adjustable beds have been known to fail after a short number of cycles using mattresses of the afore-mentioned thickness. One way to overcome this has been to use special, more flexible, “ribbed” mattress. However, this is not a practical solution for most applications.
Another problem associated with known designs is that the angle of elevation between the seat and the raised back support section is not ideal ergonomically, as it does not allow the mattress to naturally crease around the user's hip joint, so the user has to continually adjust their position as the backrest lifts.
A further problem associated with known designs is the requirement for the operating mechanism to be as compact as possible to free up space underneath the bed. In domestic beds, this space is often used to house drawers for storage, and therefore the more compact, or thinner the mechanism, the greater the storage capability.
A further problem associated with known designs is the rigidity of the support section when under the weight of a user. For example, a foot support section of the bed is vulnerable to the weight of the user and can require additional bracing to increase the rigidity.
There is therefore a requirement for an adjustable article of furniture which addresses the aforementioned problems associated with known designs, which is at least as easy to manufacture, store, transport, deliver and assemble as non-adjustable furniture of known designs.
Thus according to one aspect of the present invention, there is provided an article of adjustable furniture comprising a plurality of articulated support sections, said support sections including at least one adjustable first support section and at least one adjustable second support section, and an actuator mechanism for effecting co-ordinated pivotal movement to angularly adjust the at least one adjustable first support section relative to the at least one adjustable second support section, in which the actuator mechanism is operable to drive a first connecting means to act directly on the first support section, and a second connecting means to act directly on the second support section or a pivotal point connecting the first and second support sections such that the actuator mechanism simultaneously drives both support sections.
The provision of two connecting means to drive the support sections results in a more rigid structure when under load, greater control of the co-ordinate pivotal movement of the support sections, and more efficient use of the actuator. A result of more efficient actuator use is the ability of the actuator to drive the support sections from a shallower angle, which enables more compact mechanisms to be used, freeing up space within the furniture.
The above and other aspects, features and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate the same elements.
Reference will now be made in detail to embodiments of the invention. Wherever possible, same or similar reference numerals are used in the drawings and the description to refer to the same or like parts or steps. The drawings are in simplified form and are not to precise scale. The word ‘couple’ and similar terms do not necessarily denote direct and immediate connections, but also include connections through intermediate elements or devices. For purposes of convenience and clarity only, directional (up/down, etc.) or motional (forward/back, etc.) terms may be used with respect to the drawings. These and similar directional terms should not be construed to limit the scope in any manner. It will also be understood that other embodiments may be utilized without departing from the scope of the present invention, and that the detailed description is not to be taken in a limiting sense, and that elements may be differently positioned, or otherwise noted as in the appended claims without requirements of the written description being required thereto.
With reference to
The panels 12-18 are mounted on a support frame 20. The upper body support panel 12 and lumbar support panel 13 are adjustably mounted on the support frame 20. The intermediate support panel 14 and lower body support section panel 16 are fixed in relation to the frame 20. The thigh support panel 17 and lower limb/foot support panel 18 are adjustably mounted on the support frame 20. The lumbar support section 13 has an upper surface 19, and the backrest support section 14 has an upper surface 21. An interior angle B, is defined between upper surfaces 19, 21, the interior angle B always being less then 180 degrees when the bed moves towards the fully raised configuration such that the backrest section 14 is always tilted towards (anti-clockwise when viewing
The frame 20 comprises two half sections 20a, 20b hinged together at their respective adjacent ends. The two half sections include a head end sub-assembly 20a and a toe end sub-assembly 20b. The two half sections 20a, 20b are hinged together at their respective adjacent ends by hinges 24 fixed to the upward facing surface of the panels 14 and 16 at their respective adjacent edges, as can best be seen in
The upper body support panel 12 and the lumbar support section panel 13 are adjustably mounted on the head end support frame sub-assembly 20a. The intermediate support panel 14 is fixedly mounted on the head end support frame subassembly 20a, adjacent to the lumbar support panel 13. The lower body panel 16 is fixed in relation to the toe end support frame sub-assembly 20b adjacent to the intermediate panel 14. The thigh support panel 17 and lower limb/foot support panel 18 are adjustably mounted on the toe end support frame sub-assembly 20b adjacent to the fixed lower body support section panel 16.
The lumbar support panel 13 is pivotally connected to the fixed intermediate support by means of a hinged joint 22 extending along the respective adjacent edges of the panels. As can best be seen in
The upper body support panel 12 is similarly pivotally connected to the lumbar support panel by means of a hinged joint 25 extending along the respective adjacent edges of the panels. The hinged joint 25 comprises a plurality of hinges 25′ spaced along the edges of the adjacent edges of panels 12 and 13 within the region of the frame 20. The adjacent edges of the panels 12 and 13 are provided with respective elongate hinge mounting brackets 26a, 26b, preferably of metal construction, which extend on the underside of the panels 12 and 13 between the sides of the frame 20a, as can best be seen in
Hinges 22′ and 25′ may be conventional pin bracket type hinges or, in other embodiments, constructed of a fatigue resistant plastics material, for example as a so called “living hinge”. Other types of hinge are also contemplated including extruded metal tubes, for example extruded aluminium or aluminium alloy, having a d or p shape cross-section, including a longitudinal mounting flange as an integral part of the extrusion, where a hinge pin passes through the extruded tube in a known manner and optionally mounted on bearings (ball bearing type) located at the respective ends of the tube to support the hinge pin in a low friction manner. In preferred embodiments, at least hinges 25′ are provided with limited angular adjustment so that the adjustable panel 12 has a limited downward angular adjustment with respect to the lumbar support panel 13. In the illustrated embodiment, the hinge 25 is provided with an abutment stop in the form of a rectangular, preferably metal, plates 27 that are fixedly secured or connected to the hinge mounting bracket 26a in the region of the hinges 25′. The plates 27 are positioned on the underside of the hinge 25 and prevent panel 12 being lowered beyond the plane of panel 13 by mutual abutment of the plates 27 and the underside of the mounting brackets 26b. Thus, when the panels 12 and 13 are lowered flat they remain 180 degrees apart.
Hinges 22′ and 25′ are also limited upwards so each platform section 12. 13 cannot go beyond this angle relative to the previous panel section it is hinged to (typically 30 degrees, or the total combined angel of angular adjustment divided by the number of intermediary platform sections). Hinges 22′ and 25′ are also limited downwards so each platform section cannot fall below parallel to the previous section it is hinged to.
As will be described in greater detail below, panels 12 and 13 may be raised by a predetermined maximum amount about their respective pivot axis during adjustment of the bed, for example 65 degrees, combined, from the horizontal plane as defined by the flat orientation of fixed intermediate support panels 14 and 16 of the bed. Hinges 22 and 25 are provided with stop means to limit the degree of relative angular adjustment of the panels 12 and 13. Typically the maximum combined angular adjustment of the panels is 65 degrees with respect to the plane of the fixed non-adjustable panel 14. The hinges 22 and 25 may thus be adapted so that they contribute to the maximum angular adjustment of the panels 12 and 13 by equal amounts or substantially equal amounts, for example, 50/50 or 40/60 depending on the particular application and maximum angel of adjustment required.
As previously described, in embodiments of the present invention, the maximum combined angle of adjustment of the backrest and lumbar support sections is typically 50-65 degrees. In the illustrated embodiment, the angle of adjustment is shared between hinges 22 and 25 connecting each side of the lumbar support platform. The hinge axes are preferably 200-300 mm apart in the longitudinal direction of the bed, as best seen from the view of
In
Referring to
In the lowered position (
The half frame sub-assemblies 20a and 20b each comprises a generally rectangular structural support frame, preferably constructed of metal but other materials may be used for various component parts, in addition to or instead of metal, including board type material, for example engineering plastic, MDF, timber or other fibre type board for example.
The two half sections 20a and 20b each comprise a pair of elongate parallel lateral side frame members in the form of respective side rails 30a, 30b. The side frame members extend longitudinally along the length of the bed on both sides thereof and are joined together at their respective ends by metal, preferably steel, cross-members 31a, 31b, 32a, 32b to form rectangular box type structural support frames 20a, 20b.
The side frame members 30a, 30b are constructed of suitably dimensioned box section metal tube, preferably steel, and the cross-members 31a and 32b of similar rectangular box section metal tube. The frame 20 is provided with legs 28 towards each of the corners of the rectangular frame structure and at an intermediate position at the end of the toe end sub-assembly 20b. The side members 30a, 30b and respective cross members 31a, 31b and 32a, 32b are joined together by welding or alternatively by fixing means such as screws, bolts, fasteners or the like. In preferred embodiments, the legs are attachably/detachably fixed to the frame by suitable reversible fixing means as are well known in the art, for example screw thread fittings.
The two half sub-assemblies 20a and 20b are provided with locking means for locking the frame members 30a, 30b together when the frame 20 is unfolded. The locking means comprises a metal plate 33 secured on the underside of the respective side frame members 30b in the region of the hinged connection 24. The metal plate 33 extends over the underside of the adjacent side frame member 30a and is attachably/detachably fixed thereto by suitable reversible fixing means, as are well known in the art, for example screw thread fittings, such as a butterfly or winged 5 nut/bolt connection 35 as in the illustrated embodiment.
The unfolded and locked support frame 20 constitutes a floor standing base of the bed 10. The frame 20 may stand directly on legs 28 or alternatively be provided with castors, feet or the like at the end of the legs, as is well known in the art. Alternatively, the legs may be removed and the frame adapted to be mounted within a bed surround, for example with the side frame members sitting on a suitable mounting on the inside of a suitably adapted bed surround. As previously indicated, the frame 20 can be manually folded and unfolded about the traverse hinge axis defined by the hinge elements 24. Either the head end or toe end frame is moved so that the two half sections of the frame are brought together by 10 relative movement about the hinge axis as shown in
Movement of the adjustable panels 12 and 13 is effected by means of a powered actuation mechanism comprising a linear actuator 40 and a first connecting means in the form of a pivotal “H-frame” 42. The H-frame 42 comprises a pair of arms 44 and a cross-member 46 extending between and connecting the arms 44 approximately midway along their length. The arms 44 have a first distal end 65 and a second distal end 67 with an aperture 69 positioned towards the second distal end 67. Each arm 44 has a feature in the form of a raised portion 71 co-axial with the aperture 69. The arms 44 are generally straight but curve upwards at their first distal end 65 where a roller in the form of a bearing 52 is rotatably mounted. The bearings 52 contact the underside of the panel 12 along wear resistant strips 54 which may be of metal, nylon or the like, along which the bearings 52 run when the panel 12 is lowered and raised.
The H-frame is pivotally mounted at the second distal end of arms 44 on a second component in the form of a bracket 50 which is fixed to the underside of the head end sub-assembly frame 20a at pivot points 48. The brackets 50 depend from the underside of the frame 20a in the region of hinges 25. The bracket 50 includes an integral bearing housing 51 which is configured as described below to house and retain a bearing assembly 53.
In
The actuator 40 is a linear actuator of the Delta-drive type as produced by Dewert-Okin GmbH, having a first end (motor and gear box end) pivotally mounted to the cross member 32b and a second end (rod) pivotally connected to a bracket 56 secured to the cross-member 46. The bracket 56 is configured such that the connection between the output rod of the actuator and the bracket 56 is in the plane of the panel 12. This is achieved by means of a cut-out slot 58 in the panel 12 through which the bracket 56 and end of the output rod of the actuator extend. The gearbox and motor end of the actuator 40 is connected to the cross-member 32b at a position midway along its length. The cross-member 32b is located in a plane lower than the general or notional plane of the frame 20 due to the downwardly canted end of the frame 20a. The side members 30a are inclined downwards along the final third of their length from a position immediately rearward of the legs 28 attached to the frame 20a. The side members are inclined downwards approximately 20 degrees or so, so that the connection point between the actuator 40 and the frame 20a is below and offset from the notional plane of the frame 20. This arrangement ensures the actuator is also inclined with respect to the notional plane of the frame and the plane of the panel 12 when the panel 12 is in its lowered position (
Rotational movement of the panel 12 is thus effected by activation of linear electrical actuator 40 positioned on the underside of the bed within the space envelope of the frame. Thus, panel 12 is raised and lowered by respective extension and retraction of actuator 40. In operation, in the fully lowered configuration of the bed, the adjustable panels 12 and 13 lie flat on the side rails 30a, with the output rod of actuator 40 fully retracted towards the respective gearbox end of the actuator. This position is shown in
The provision of a bearing assembly and housing at the pivotal connection of the arm 44 and the bracket 50 results in a significantly lower initial actuator force being required to move the panel when compared to using a conventional nut, bolt and washer arrangement. In alternative embodiments, a bearing assembly and housing arrangement can be provided at other pivotal connections to further reduce the initial actuator force requirement. For example, the bearing assembly and housing arrangement can be provided between the cross-member 46 of the H-bar 42 and the actuator 40 to provide a pivotal connection. An identical bracket to the bracket 50 of the embodiment of
In preferred embodiments, the maximum combined angular adjustment of the panels 12 and 13 is 65 degrees, that is to say the maximum raised inclined angle of the backrest panel 12 with respect to the notional flat horizontal plane of the bed is limited to 65 degrees. This angle of adjustment includes the combined angle of adjustment of the lumbar support panel 13 with respect to the fixed panel 14 and the angle of adjustment of the backrest panel 12 with respect to the lumbar support panel 13. The combined angular adjustment may be less, for example, a maximum of 60, 55, 50 degrees or less, and may be contributed by equal amounts of angular adjustment by the panels 13 and 14. The maximum angular adjustment is determined by the geometry of the actuation mechanism including the mounting arrangement and the operation stroke of the actuator as well as the relative length dimensions of the respective adjustable panels.
It is to be understood that a mattress of appropriate thickness, say in the range of 25 to 50 cm (10 to 20 inches), is to be positioned on the mattress support platform of the bed 10.
Movement of the adjustable panels 17 and 18 is effected by means of a powered actuation mechanism comprising a linear actuator 40a identical to the actuator 40 driving panel 12, and a first connecting means in the form of a pivotal frame 42a. The frame 42a comprises a pair of arms 44a and a cross-member 46a extending between and connecting the arms 44a. The arms have a first distal end 65a which is connected to the underside of the panel 17, and a second distal end 67a which is pivotally mounted on a second component in the form of a bracket 50a which is fixed to the frame 20 at pivot points 48a. The brackets 50a depend from the underside of the frame 20 in the region of hinges 41′. In contrast to the pivotal connection between arms 44 and bracket 50 via a bearing assembly and housing arrangement, the arms 44a are pivotally attached to the bracket 50a using a simple nut, bolt and washer arrangement 75a such that the arms 44a rotate relative to the bracket 50a which is fixed to the frame 20. In an alternative embodiment, the bearing assembly 53 and bearing housing 51 described in relation to the movement of the panel 13 can be used to provide a pivotal connection between the arms 44a and the bracket 50 instead of the nut, bolt and washer arrangement. Similarly, the pivotal connection between the actuator 40a and the cross-member 46a can be provided by a bearing assembly and housing arrangement as described in relation to the pivotal connection between actuator 40 and cross-member 46.
The actuator 40a has a first end (motor and gear box end) pivotally mounted to the cross member 31a and a second end (rod) pivotally connected to a bracket 56a secured to the cross-member 46a. Rotational movement of the panel 17 is thus effected by activation of linear electrical actuator 40a which causes the cross-member 46a and arms 44a to rotate. Thus, panel 17 is raised and lowered by respective extension and retraction of actuator 40a. Panel 18, by virtue of being connected to panel 17 via hinge 43′ is also raised and lowered as panel 17 is raised and lowered. A brace 81 is fixed to the underside of panel 18 and the frame 20 to provide additional rigidity and support when panel 18 is under load (
In the above described embodiments, panels 12 and 13 are rotated by an actuator 40 acting on panel 12 via arms 44, and panels 17 and 18 are rotated by actuator 40a acting on panel 17, that is to say, a first connecting means 44, 44a acts on and engages with the respective panels 12, 17. It is the fact that panels 17 and 18, and panels 12 and 13 are connected by respective hinges 43′ and 25′ which causes panel 18 to rotate as panel 17 is rotated, and panel 13 to rotate as panel 12 is rotated.
With reference to
Actuator 140a is connected to the frame 120 and to the cross-member 146a in the same way as actuator 40 is connected to the frame 20 and to the cross-member 46 of the embodiment of
Arms 144 extend from cross-member 146 and have a roller bearing 152 at one end which is identical to bearing 52, and is pivotally connected to the frame 120 at the other end at pivot point 148 by an integral bearing housing 151 identical to the bearing housing 51, and a raised portion 171 located on bracket 150, the raised portion 171 being identical to the raised portion 71 (
The bearing housing 151 and the bearing assembly is located on the arms 144a (first component) and the raised portion 171 is located on bracket 150 (second component) which is in contrast to the pivotal connection between bracket 50 and arm 44 where the raised portion 71 is provided on the arm 44 and the bearing housing 51 and bearing assembly 53 is provided on the bracket 50. It will be appreciated therefore that the bearing housing and assembly can be provided on one of the first or second components, and the feature, such as the bracket with the raised portion can be provided on the other of the first and second components to provide the pivotal connection.
Arms 190 are pivotally connected to the arms 144 at pivot point 191, which is positioned approximately mid-way along the length of arms 144, via a raised portion 171a which engages with a bearing assembly (not shown) identical to bearing assembly 53, housed within an integral bearing housing 151a on one end of the arm 190. Raised portion 171a (
Arms 190 have another integral bearing housing 151b identical to integral bearing housing 151a, at their other end which is pivotally connected to a bracket 195 which is fixed to the underside of the thigh support panel 117 using fixing means such as screws 196. The bracket 195 includes a raised portion 171b (
In operation, activation of the linear electrical actuator 140a causes the cross-member 146a and arms 44a to rotate about pivot point 148. As arms 144a rotate, the bearing 152 acts on the underside of panel 118 causing it to be raised relative to the frame 120. Simultaneously, rotation of arms 144 causes the pivotally connected arms 190 to rotate and act against the underside of panel 117 causing panel 17 to rotate relative to the frame 120 about hinge 122′ (
With reference to
Operation is similar to the way actuator 40a drives panels 117 and 118 in the embodiment of
It will be understood that in the embodiments of
It will also be understood that whilst the above embodiments have been described in relation to an adjustable bed, the concepts also can be applied to an adjustable chair. For example, a bearing assembly and housing can be used to provide a pivotal connection between moving components of the chair such as an actuator supported on a fixed based section and a moveable seat section which is pivotally connected to the actuator. Similarly, first and second connecting means can be used to simultaneously move support panels on a chair.
Various operations may be described as multiple discrete operations in turn, in a manner that may be helpful in understanding embodiments of the present invention; however, the order of description should not be construed to imply that these operations are order dependent.
Although only a few embodiments have been disclosed in detail above, other embodiments are possible and the inventors intend these to be encompassed within this specification. The specification describes certain technological solutions to solve the technical problems that are described expressly and inherently in this application. This disclosure describes embodiments, and the claims are intended to cover any modification or alternative or generalization of these embodiments which might be predictable to a person having ordinary skill in the art.
Having described at least one of the preferred embodiments of the present invention with reference to the accompanying drawings, it will be apparent to those skills that the invention is not limited to those precise embodiments, and that various modifications and variations can be made in the presently disclosed system without departing from the scope or spirit of the invention. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.
Number | Date | Country | Kind |
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1504140.3 | Mar 2015 | GB | national |
1610212.1 | Jun 2016 | GB | national |
1712186.4 | Jul 2017 | GB | national |
This application is a continuation (CON) of PCT Ser. No.: PCT/GB2018/052150 (WO 2019/021025) filed Jul. 27, 2018, the entire contents of which are incorporated herein by reference, which in turn claims priority to GB 1712186.4 filed Jul. 28, 2017. This application is also a continuation-in-part (CIP) of U.S. Ser. No. 15/557,192 filed Sep. 11, 2017, the entire contents of which are incorporated herein by reference, which is a 371 National Phase of PCT/EP2016/055381 filed Mar. 11, 2016, the entire contents of which are incorporated herein by reference, which claims priority to GB 1504140.3 filed Mar. 11, 2015. This application is also a continuation-in-part (CIP) of U.S. Ser. No. 16/307,530 filed Dec. 6, 2018, the entire contents of which are incorporated herein by reference, which is a 371 National Phase of PCT/GB2017/051722 filed Jun. 13, 2017, the entire contents of which are incorporated herein by reference, which claims priority to GB 160212.1 filed Jun. 13, 2016.
Number | Date | Country | |
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Parent | PCT/GB2018/052150 | Jul 2018 | US |
Child | 16749469 | US |
Number | Date | Country | |
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Parent | 15557192 | Sep 2017 | US |
Child | PCT/GB2018/052150 | US | |
Parent | 16307530 | Dec 2018 | US |
Child | 15557192 | US |