VEHICLE BED-COUCH

Field of the invention

The present invention relates to vehicle beds or couches, for example to vehicle-cab beds or couches. Moreover, the present invention also relates to methods of adjusting aforesaid vehicle beds or couches for achieving continuously-variable degrees of bed or couch stiffness and hence continuously adjustable degrees of comfort.

Background of the invention

Beds and couches in cabs of heavy commercial vehicles are well known. In Figure 1 , such an example vehicle is indicated generally by 10. The vehicle 10 includes a cab 20 coupled to a trailer 30. The cab 20 includes a steering console 40 including a steering wheel 50 and driver's seat 60. In operation, a driver 70 is seated at the console 40 and adjusts controls of the console 40 and the steering wheel 50 for controlling and guiding a trajectory of the vehicle 10. In a rear portion of the cab 20, there is included a bed or couch 100 behind the console 40; optionally, a safety barrier 110, for example a safety net, is included between the bed or couch 100 and the console 40 to provide protection to a person sleeping or resting on the bed or couch 100 in an event of vehicular impact, namely a crash event.

Heavy commercial vehicles are costly investments. Competition amongst contemporary haulage companies requires their heavy commercial vehicles to be utilized to a fullest extent possible. It is therefore conventional practice for drivers of heavy commercial vehicles to sleep and rest in cabs of such vehicles when not driving the vehicles. Moreover, it is contemporary practice for heavy goods vehicles to have first and second drivers, wherein the first driver sleeps or rests on the bed or couch 100 of the cab 20 whilst the second driver drives the vehicle 10, and vice versa, so that the vehicle 10 is susceptible to being kept in nearly constant use.

With regard to quality of life for the aforesaid first and second drivers when working with the vehicle 10, a quality of comfort provided by the bed or couch 100 is very important. For example, as elucidated in a published Swedish patent no. SE 518 584 C2, it is important that a bed for incorporation into a vehicle cab has a requisite width for providing a comfortable

rest or sleep. In the published Swedish patent no. SE 518 584 C2, there is described a bed arrangement with a variable bed surface. The bed arrangement comprises a first bed element with a first bed surface, and at least one supplementing peripheral second bed element with a second bed surface. Moreover, the bed arrangement also includes connecting devices which allow positioning of the second bed relative to the first bed element so that the bed arrangement is provided with a bed surface which comprises the first bed surface and the second peripheral bed surface. The second peripheral bed surface comprises a material body made of an elastic material, wherein the material body is compressible for adjusting a size of the second bed surface. The first bed surface has a size which is considerably greater than the second bed surface; the first bed surface is thereby operable to function as a primary supporting surface for a driver resting on the bed arrangement and is operable to exhibit a constant non-adjustable support stiffness in use.

A problem arising in practice is that drivers have different body weights and also different needs for support when resting or sleeping. Such support can depend, for example, on therapeutic need of the driver on account of driving activities potentially giving rise to repetitive strain injury or limb stiffness. There therefore arises a need for providing the bed arrangement with more possibilities for adjustment.

Air beds are known which can be inflated and thereby adjusted to user preference. However, such air beds have not found widespread use for vehicle cabs where a greater degree of comfort than can be provided by inflatable air beds is desired.

Summary of the invention

An object of the present invention is to provide a bed or couch which is more versatile in its possibilities of comfort adjustment, for example for use in vehicle cabs for providing a greater degree of comfort during driver sleeping or resting.

The object of the invention is capable of being addressed by a bed-couch as defined in appended claim 1. According to a first aspect of the invention, there is provided a bed-couch including an upper supporting surface for receiving a person, the bed-couch being operable to provide a flexible support characteristic at the upper surface for supporting the person, characterized in that the bed-couch comprises an array of spatially distributed spring elements or providing the flexible support characteristic, the array of distributed spring

elements having mutual spatial separations which are adjustable for affecting in operation a continuously-variable adjustment of the flexible support characteristic.

Optionally, the bed-couch is implemented to be variable in at least one of its width and length for affecting adjustment of the mutual separations between the spring elements. Such an implementation renders user-adjustment of the flexible support characteristic possible.

Optionally, in order to achieve a more uniform adjustment of the flexible support characteristic for the bed-couch, the array of spring elements are coupled together in rows using a coupling arrangement, the coupling arrangement being operable to spatially distribute the spring elements along their respective rows in response to adjusting one or more the width and length of the bed-couch.

Optionally, the bed-couch further includes a fastening arrangement for maintaining the bed- couch in a defined state of extension so as to maintain the defined corresponding flexible support characteristic when the bed-couch is in use with the person resting or sleeping thereupon. Such a fastening arrangement is of benefit in that it prevents the bed-couch springing back by elastic forces back to its retracted non-deployed state.

Optionally, the bed-couch further comprises a load-spreading arrangement interposed between at least a portion of the array of spring elements and the supporting upper surface, the load-spreading arrangement being operable to locally distribute load forces applied thereto so that the spring elements are not substantially individually discernable by the person when resting or sleeping on the upper support surface. The load-spreading arrangement is of benefit in that it is capable of enhancing driver comfort when resting or sleeping on the bed-couch.

More optionally, in the bed-couch, the load-spreading arrangement is adjustable in area in response to the bed-couch being adjusted in at least one of its width and its length. Such performance of the load-spreading arrangement is of benefit in that the bed-couch is susceptible to providing a high degree of continuously-variable support adjustment over its entire supporting surface area irrespective of its degree of extension.

More optionally, in the bed-couch, the load-spreading arrangement includes interleaved and/or foldable component parts for providing for the adjustment of area of the load- spreading arrangement.

Optionally, in the bed-couch, the spring elements are arranged in rows and columns which are substantially parallel or orthogonal to transverse and longitudinal axes (x, z) of the bed- couch. Alternatively, in the bed-couch, the spring elements are arranged in rows and columns which are substantially diagonal to transverse and longitudinal axes (x, z) of the 5 bed-couch (105).

Optionally, in the bed-couch, the spring elements are implemented as one or more of:

(a) one or more coiled helical springs implemented using a spiral of metal spring wire;

(b) one or more coiled helical springs implemented using one or more spirals of molded 0 plastics material;

(b) an expanded porous elastic plastics material foam;

(c) a porous natural polymer elastic material;

(d) one or more inflated cavities bounded by flexible substantially gas-tight walls; and

(e) a flexible leaf-spring arrangement implemented using one or more of metal and 5 plastics material leaf springs.

Optionally, in the bed-couch, the coupling arrangement is implemented as one or more of:

(a) one or more bands, strips or webs of elastic material;

(b) a molded elastic chain of components fabricated from polymer plastics material; 0 (c) a chain of flexible spring metal hoops operable to exhibit longitudinal elastic behaviour; and

(d) an inflatable and deflatable air envelope operable when inflated to separate its respective neighbouring spring elements, and operable when deflated to enable the neighbouring spring elements to substantially mutually abut. >5

Optionally, the bed-couch is adapted for use in one or more applications as follows:

(a) for cabs of heavy commercial vehicles;

(b) for aquatic vessels including one or more of: yachts, ferries, cruise ships, cargo ships, submarines;

0 (c) in air-borne vehicles includes one of more of: aircraft, space stations;

(d) in road vehicles and trailers including one or more of: a caravans, coaches, buses, automobiles;

(e) in hospitals for improving patient comfort where a wide range of patient weights and preferences need to be accommodated;

5 (f) in domestic premises;

(g) in massage parlours for massage beds; and (h) in infant cots in nurseries.

The bed-couch pursuant to the present invention is even susceptible to being adapted to function as comfort-adjustable reclining couches for dentists' surgeries, tattoo parlours and surgical operating theatres for ensuring patient or customer enhanced comfort and freedom from pain.

According to a second aspect of the invention, there is provided a vehicle comprising one of more bed-couches pursuant to the first aspect of the invention.

According to a third aspect of the invention, there is provided a method of adjusting a stiffness of support provided in operation by a bed-couch including an upper supporting surface for receiving a person, the bed-couch being operable to provide a flexible support characteristic at the upper surface for supporting the person, characterized in that the method includes steps of: (a) providing in the bed-couch an array of spatially distributed spring elements for providing the flexible support characteristic; and

(b) adjusting mutual spatial separations between neighbouring spring elements of the array of distributed spring elements for affecting in operation a continuously-variable adjustment of the flexible support characteristic.

It will be appreciated that features of the invention are susceptible to being combined in any combination without departing from the scope of the invention as defined by the appended claims.

Description of the diagrams

Embodiments of the present invention will now be described, by way of example only, with reference to the following diagrams wherein:

Figure 1 is an illustration of a contemporary vehicle whose cab includes a bed or couch for driver sleeping or resting;

Figure 2 is an illustration of an embodiment of a bed-couch pursuant to the present invention;

Figure 3 is a cross-sectional illustration of the bed-couch of Figure 2;

Figure 4 comprises illustrations regarding implementation of an optional load spreading layer included within the bed-couch of Figure 2;

Figure 5 is a perspective schematic view of the bed-couch of Figure 2 in two conditions of extension providing variable support stiffness;

Figures 6a and 6b are plan schematic views of the bed-couch of Figure 2, illustrating two alternative spring configurations;

Figure 7 is a schematic illustration of the bed-couch of Figure 2 in situ in a vehicle cab, the bed-couch being in a retracted compact state; and

Figure 8 is a schematic illustration of the bed-couch of Figure 2 in situ in a vehicle cab, the bed-couch being in a deployed state.

Description of embodiments of the invention

In overview, the present invention is concerned with a modified implementation of the aforesaid bed or couch 100 for achieving adjustable spring stiffness per unit area of its upper load-bearing surface so that the driver 70 of the vehicle 10 is able to adjust the modified implementation of the bed or couch 100 for optimal comfort. Such optimal comfort is potentially dynamically variable depending upon a body weight of the driver 70, and a physical state of the driver 70 such as a level of driver 70 fatigue and driver 70 strain injury. The modified implementation of the aforesaid bed or couch 100 pursuant to the present invention is concerned with providing an array of spring elements whose mutual spatial separation is susceptible to being driver-adjusted so as to affect an adjustment of effective spring stiffness per unit area of the modified implementation of the aforesaid bed or couch 100. Implementations of the invention are concerned with ensuring that array of spring elements incorporated into the modified implementation of the aforesaid bed or couch 100 spread themselves out in a desirably uniform manner during comfort adjustment of the modified bed or couch 100.

Referring to Figure 2, an embodiment of a bed or couch pursuant to the present invention is indicated generally by 105.; the bed or couch 105 will hereinafter be referred to as "bed- couch 105". The bed-couch 105 is driver-adjustable in size between a retracted compact

non-deployed state denoted by 110 and an expanded deployed state denoted by 120. The bed-couch 105 is relatively stiffer per unit area thereof on its upper surface when in the retracted state 110, and is relatively softer per unit area thereof on its upper surface when in the expanded state 120. The bed-couch 105 is continuously adjustable in stiffness per unit 5 area between the retracted state 110 and the expanded state 120 by adjusting a transverse width of the bed-couch 105 as denoted by arrows 130. For example, the bed-couch 105 is 2 metres long, 0.8 metres wide and 25 cm thick in the retracted state 110, and the bed-couch 105 is 2 metres long, 1,2 metres wide and 25 cm thick in the expanded state 120. Optionally, the bed-couch 105 is implemented so that its underside is slidably supportable on0 a supporting surface 160, for example a bench structure of the cab 20 of the vehicle 10 as illustrated in Figures 7 and 8. The bed-couch 105 is implemented to be firmly couplable to an attachment surface of the cab 20 at one or more of:

(a) a side surface 140 of the bed-couch 105; and

(b) an underside edge surface 150 of the bed-couch 105. 5

The bed-couch 105 will now be described in greater detail with reference to Figure 5. In Figure 5, a schematic illustration of a cross-section through the bed-couch 105 is shown. The bed-couch 105 comprises a spatially distributed array of spring elements 220 mutually coupled together by flexible coupling elements 230. Optionally, the spring elements 220 are

!0 mutually similar. Alternatively, the spring elements 220 can be mutually different; for example, those spring elements 220 which are near a periphery of the bed-couch 105 are optionally stiffer than those spring elements 220 near a central region of the bed-couch 105 so that the bed-couch 105 naturally forms a retaining depression at its centre for preventing the driver 70 from vibrating out of the bed-couch 105 when the vehicle 10 is being driven by

5 another driver and the driver 70 is resting or sleeping.

The spring elements 220 are each beneficially implemented as one or more of:

(a) one or more coiled helical springs implemented using one or more spirals of metal spring wire, for example steel wire and/or phosphor bronze wire;

) (b) one or more coiled helical springs implemented using one or more spirals of molded plastics material, for example nylon and/or polypropylene;

(b) an expanded porous plastics material such as expanded polyurethane foam;

(c) a porous natural polymer material such as porous natural rubber;

(d) one or more inflated cavities bounded by flexible substantially gas-tight walls;

(e) a flexible leaf-spring arrangement implemented using one or more of metal and plastics material leaf springs.

The flexible couple elements 230 are beneficially implemented to couple spring elements 220 into rows orientated substantially in a direction along the arrows 130 in Figure 2. The flexible coupling elements 230 are beneficially implemented as one or more of:

(a) one or more bands, strips or webs of elastic material, for example natural rubber 5 and/or silicone rubber and/or polyurethane;

(b) a molded elastic chain of components fabricated using nylon, polyurethane, polypropylene, or similar elastic polymer plastics material;

(c) a chain of flexible spring metal hoops operable to exhibit longitudinal elastic behaviour; and 0 (d) an inflatable and deflatable air envelope operable when inflated to separate its respective neighbouring spring elements 220, and operable when deflated to enable the neighbouring spring elements 220 to substantially mutually abut.

The bed-couch 105 also comprises an outer fabric layer 200 implemented in flexible material5 which is susceptible to stretch when the bed-couch 105 is progressively adjusted from its retracted non-deployed state 110 to its fully deployed state 120. The fabric layer 200 is beneficially implemented as a very loosely woven coarse-thread fabric which is highly resistant to wear, for example loosely-woven nylon fabric, loosely-woven polyester fabric, loosely-woven cotton fabric, loosely-plaited leather fabric, polyurethane fabric, loosely-woven

!0 linen fabric.

In order to render the bed-couch 105 sufficiently comfortable when laid directly upon by the driver 70, the outer fabric layer 200 is beneficially implemented to be several layers thick, for example to a total multi-layer thickness in a range of 3 mm to 15 mm, more optionally in a

5 range of 5 mm to 10 mm thick. Optionally, to further reduce individual spring elements 220 being felt when the driver 70 is resting on the bed-couch 105, there is included a load- spreading feature denoted by 210. The load-spreading feature 210 is beneficially extensible as the bed-couch 105 is progressively adjusted between its compact retracted state 110 and its fully deployed state 120. When the outer fabric layer 200 is sufficiently thick to provide

) significant load spreading, the load-spreading feature 210 is optionally omitted.

Optionally, the load-spreading feature 210 is coupled only at its central longitudinal axis to a corresponding central longitudinal row of spring elements 220 and slidably retained down in position by the outer fabric cover 200 onto the array of spring elements 220; the load- spreading feature 210 is then of a width corresponding to the bed-couch 105 when in its retracted state 110 such that edges of the array of spring elements 220 are then not covered by the load-spreading feature 210 when the bed-couch 105 is in its deployed extended state

120. It would be abnormal for the driver 70 to apply his/her weight at the periphery of the bed-couch 105 when in its expanded deployed state 120.

When adjustable in area, the load-spreading feature 210 is optionally, in a first arrangement, 5 implemented as shown in cross-section in an upper portion of Figure 4 and indicated by 300 in a retracted non-deployed state, and by 350 in fully extended deployed state. As indicated by 300, 350, the load-spreading feature 210 is implemented as a series of interleaved flexible sheets 310 which are operable to glide with respect to one another to accommodate adjustment of the bed-couch 105 between its contracted state 110 and its extended deployed0 state 120. The interleaved flexible sheets 310 are interleaved to a greater extent when the bed-couch 105 is in its non-deployed retracted state 110 in comparison to being interleaved to a lesser extent when the bed-couch 105 is in its fully deployed expanded state 120. The flexible sheets 310 are beneficially implemented from a polymer plastics material, for example polytetrafloroethylene (PTFE), PTFE-coated silicon rubber, nylon, polyethylene or5 similar. Moreover, the flexible sheets 310 are beneficially elongate in a direction substantially parallel with an elongate longitudinal axis z of the bed-couch 105 as shown in Figure 5. Furthermore, the flexible sheets 310 are beneficially coupled to their respective spring elements 220 so that their degree of interleaving is uniformly distributed amongst the sheets 310 as the bed-couch 105 is adjusted in stiffness in operation. Optionally, the sheets

!0 310 are flexibly coupled together at their uppermost edges and/or at their lowermost edges, for example using extensible elastic strips, so that adjustment of the bed-couch 105 in a direction denoted by x in Figure 5 is equally distributed amongst the sheets 310 in use.

In a second arrangement of the load-spreading feature 210 as illustrated in a middle portion 5 of Figure 4, there is included a zig-zag concertina-type component 430 whose folds are elongate in a direction substantially parallel to the longitudinal axis z of the bed-couch 105 as shown in Figure 5. The component 430 is shown in its retracted state as indicated by 400 and its extended deployed state by 440. The component 430 is optionally bounded by load- spreading flexible sheets 410, 420, for example implemented as a stretchly loosely-woven ) thread fabric, so that individual folds of the component 430 are not substantially felt by the driver 70 when sleeping or resting on the bed-couch 105.

In a third arrangement of the load-spreading feature 210 as illustrated at a lower portion of Figure 4 and indicated generally by 450, the spring elements 220 are coupled by transverse flexible support bars 460 and longitudinal support bars 510. The support bars 460, 510 are preferable fabricated from one or more of a flexible polymer plastics material or thin spring steel strip. The transverse bars 460 are each pivotally mounted to their first neighbouring

spring element 220 at a pivotal joint 470, and to their second neighbouring element 220 at a slot pivotal joint 480 including a slot 490 for accommodating variations in separation between adjacent spring elements 220 in response to the bed-couch 105 being adjusted in stiffness in operation, for example to a pivot position denoted by 500 when the bed-couch 105 is in its

5 fully retracted state 110. The longitudinal support bars 510 are pivotally coupled to their respective spring elements 220 by pivotal joints 520, 530. Moreover, the longitudinal bars 510 are beneficially provided with one or more load-spreading extensions 520 to provide the upper surface of the bed-couch 105 with a more spatial smooth stiffness characteristic. Optionally, one of more of the bars 460, 510 can be omitted to simplify construction and0 reduce assembly cost of the bed-couch 105.

Other implementations of the load-spreading feature 210 are possible. As elucidated in the foregoing, the feature 210 is optionally included and can even be alternatively omitted. As a further alternative, the load-spreading feature 210 is optionally included both above and5 below the array of spring elements 220.

Referring to Figure 5, adjustment of stiffness of the bed-couch 105 is illustrated schematically. In its non-deployed retracted state 110, the bed-couch 105 has a spatial separation of d^ between neighbouring spring elements 220 in a traverse row of spring !0 elements 220 along the Cartesian x axis and a spatial separation d ₃ between neighbouring spring elements 220 in a longitudinal row of spring elements 220 along the Cartesian z axis. In its extended fully deployed state 120, the bed-couch 105 has a spatial separation of d ₂ between neighbouring spring elements 220 in a traverse row of spring elements 220 along the x axis and the spatial separation d ₃ between neighbouring spring elements 220 in a

5 longitudinal row of spring elements 220 along the z axis. The spatial separation d ₃ is not limited to being equal to the spatial separations or d ₂ , and can assume a different value thereto. Optionally, the spatial separation d ₃ is an average of the spatial separations d-[ or d ₂ , namely d ₃ = (Cl ₁ + U ₂ )IZ.

)

Optionally, the coupling elements 230 are implemented as fluid-tight bellows or cavities having flexible side walls, for example implemented in rubber material in a manner generally akin to an inner-tube of a tyre (tire), which are in mutual fluid communication and which can be inflated or deflated as required to adjust the spatial separation di, d ₂ . The driver 70 is then able to adjust and deploy the bed-couch 105 by operating a fluid pump, for example an air pump; when the fluid pump includes an electric motor to provide pumping force,

_ _

adjustment of the bed or couch 105 can be executed by manipulating electrical inflate/deflate switches included within the cab 20.

The aforesaid array of spring elements 220 are susceptible to being implemented in various spatial configurations. For example, in Figure 6a, the spring elements 220 are deployed in rows and columns as denotes by 125A whose axes are substantially parallel or perpendicular at the Cartesian axes x, z in Figure 5. Alternatively, the spring elements 220 are disposed in a diagonal arrangement denoted by 126B as shown in Figure 6B. The diagonal arrangement 126B is of benefit in that the spring elements 220 can be mounted closer together for a given length of the coupling elements 230 for providing enhanced comfort.

In Figures 7 and 8, the bed-couch 105 is illustrated in its non-deployed retracted state 110 and in its fully extended deployed state 120. As elucidated in the foregoing, the bed-couch 105 is continuously adjustable between the states 110, 120. Moreover, the bed-couch 105 is useable by the driver 70 even when in its retracted non-deployed state 110 for resting or sleeping purposes and will then provide its greatest support stiffness as elucidated in the foregoing. The bed-couch 105 is slidably retained on the support surface 160 of a bench or seat 600 at the rear portion of the cab 20.

The bed-couch 105 is beneficially provided with a mechanism or feature for holding the array of spring elements 220 in a given desired state of extension to prevent the spring elements 220 springing back to the non-deployed state 110. Such a mechanism can include, for example, one or more of:

(a) tabs 610 or similar fasteners on the bed-couch 105 which are attachable in operation at various positions along pivotal extensions 620 of the bench 600 in a vicinity at extreme corners of the bed-couch 105; the pivotal extensions 620 are operable to be optionally folded down when the bed-couch 105 is in its retracted non-deployed state 110 as shown in Figure 7, and folded up as shown in Figure 8 for supporting extension of the bed-couch 105 when the bed-couch 105 is to be comfort-adjusted;

(b) a mechanical screw, chain or worm drive which are drive 70 adjustable to apply an extension force to the array of spring elements 220 for maintaining therebetween a desired spatial separation di, d ₂ ; and

(c) selective inflation or deflation of inflatable elements defining the spatial separation d _{1 (}

Cl ₂ . Alternative implementations of the mechanism are also possible.

The bed-couch 105 is of benefit, unlike known bed-couches, in that its support spring stiffness per unit area thereof is continuously adjustable across its entire body-supporting area in a highly controllable manner; such a characteristic is to be contrasted with known inflatable air beds which either provide a hard fully inflated state or a flaccid partially-deflated state, namely a non-continuously variable adjustment. Although adjustment of the bed- couch 105 along the x axis as shown in Figure 5 is described in the foregoing, it will appreciated that the bed-couch 105 can also be modified to be adjustable also in a direction generally along the z axis. Yet alternatively, the bed-couch 105 can be implemented so that its support stiffness is adjusted by modifying its length along the z axis so that the bed-couch 105 exhibits constant width whilst its stiffness is being adjusted.

The present invention also concerns methods of adjusting a support stiffness of the bed- couch 105, in its various implementations as described in the foregoing, by adjusting a spatial separation between spring elements 220 included in an array of spring elements 220.

Although deployment of the bed-couch 105 in heavy commercial vehicles is described in the foregoing, it will be appreciated that it can be employed in other applications, for example in one or more of:

(a) aquatic vessels such as yachts, ferries, cruise ships, cargo ships, submarines;

(b) in air-borne vehicles such as aircraft, space stations;

(c) in road vehicles and trailers such a caravans, coaches, buses, automobiles;

(d) in hospitals for improving patient comfort where a wide range of patient weights and preferences need to be accommodated;

(e) in domestic premises, for example in bedrooms;

(f) in massage parlours for massage beds; and (e) in infant cots in nurseries.

Expressions such as "has", "is", "include", "comprise", "consist of, "incorporates" are to be construed to include additional components or items which are not specifically defined; namely, such terms are to be construed in a non-exclusive manner. Moreover, reference to the singular is also to be construed to also include the plural. Furthermore, numerals and other symbols included within parentheses in the accompanying claims are not to be construed to influence interpreted claim scope but merely assist in understanding the present invention when studying the claims.

Modifications to embodiments of the invention described in the foregoing are susceptible to be.ng .mplemented without departing from the scope of the invention as defined by the appended claims.