IL278551B2

IL278551B2 - An adjustable headrest assembly

Info

Publication number: IL278551B2
Application number: IL278551A
Authority: IL
Original assignee: Pablo Kaplan; Chava Rotshtein
Priority date: 2020-11-08
Filing date: 2020-11-08
Publication date: 2024-03-01
Also published as: IL278551B1; IL278551A

Description

- 1 -278551/2 AN ADJUSTABLE HEADREST ASSEMBLY TECHNOLOGICAL FIELD The presently disclosed subject matter relates in general to the filed of adjustable headrests, and more particularly to the filed of an adjustable headrest assembly enabling easy adjustments of multiple positions of a headrest.

BACKGROUND Headrests are used worldwide in cars, airplanes seats, train seats and alike, and provide support for the user's head. Therefore, most headrests are adjustable, to some extent, according to the user's height. For example, a common headrest used in a car can be adjusted up or down, based on the user's height.On the other hand, for example, when used in wheelchairs, the headrest's main objective may be to provide head support for users who cannot provide such support by themselves. When the disability prevents the user from controlling their head movements, the headrest can be equipped with a head strap for fixing the head at a required position.WO 2009/015657 publication discloses a headrest comprising headrest bars and a mechanism. The headrest bars are bent at right angles to be approximately Z-shaped, while the mechanism is designed and includes or is coupled to an adjusting drive to rotate the headrest bars from a normal position in which the right angles of the headrest bars point away from the passenger, by up to 180 degrees into a protective position by rotating the bent angles of the headrest bars from the normal position thereof towards the passenger.US 3371961 patent publication discloses a fitting construction for mounting round or rectangular cross-section headrest supporting frame members to round bar or flat sheet metal framing of vehicle seat backs.EP 2946969 patent discloses a head restraint for a vehicle seat, comprising a central part, a fastening means for fastening the central part to a backrest of the vehicle seat, and at least one side part which, in a supporting position, protrudes laterally on the central part over the front surface thereof and, in a non-supporting position, is received into the contour of the central part, wherein the side part is attached to a side surface of 0274369345-01 - 2 -278551/2 the central part so as to be displaceable parallel to said side surface and, in the nonsupporting position, is of substantially L-shaped design, characterized in that the side part is flexible, wherein one end of the L-shaped side part is attached pivotably to the side surface of the central part and the other end of the L-shaped side part is attached in a longitudinally displaceable manner to the side surface of the central part.Acknowledgement of the above references herein is not to be inferred as meaning that these are in any way relevant to the patentability of the presently disclosed subject matter.

GENERAL DESCRIPTION The presently disclosed subject matter refers to an adjustable headrest assembly designed to provide multiple supporting positions to a head of a user. The adjustable headrest assembly can be easily changed between different positions, and accordingly provide support to the user's head whether they need to have their head adjusted sideways, i.e. right or left, and/or adjusted forward or backwards.The present subject matter discloses an adjustable headrest assembly configured for detachably attaching a headrest to a backrest of a chair, the headrest assembly comprising: at least one backrest connecting socket configurable at the backrest's upper portion, at least one headrest connecting socket configurable at the headrest, and at least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of the backrest socket and the headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of the headrest socket and backrest socket, wherein the first axis and the second axis are disposed at a non-coaxial relation, for detachably mounting the headrest to the backrest at a variety of selected positions.The present subject matter further discloses a chair having a seat portion, a backrest portion and a headrest detachably attachable to the backrest, wherein an upper portion of the backrest is configured with at least one backrest connecting socket; and the headrest is configured with at least one headrest connecting socket; and at least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of the backrest socket and the headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of 0274369345-01 - 3 -278551/2 the headrest socket and backrest socket, wherein said first axis and said second axis are disposed at a non-coaxial relation.The adjustable headrest assembly, the chair and parts thereof each have a front face, facing forwards, towards a user, an opposite rear face, facing backwards, a rearfront axis passing therethrough and a lateral axis perpendicular to the rear-front axis, such that the headrest rear-front axis the coupling rear-front axis and the backrest rear-front axis are parallel to each other. In most embodiments, the front face of the headrest and/or the backrest can be soft or can comprises an additional cushion, e.g. for supporting the user's head and/or back, whereas the rear face can be configured for mounting the connecting sockets thereto.The disclosed adjustable headrest assembly can provide different supporting positions of the headrest with respect to the backrest by sliding the first and/or second arm at a required corresponding connecting socket and/or by pivoting the coupling member along its longitudinal axis, thereby changing the orientation of the first arm with respect to the second arm along the rear-front or lateral axes.The headrest assembly can comprise more than two connecting sockets, e.g. to increase the number of positions at which the headrest can be adjusted, with respect to the backrest, and/or for increasing the stability of the connection between the headrest and the backrest. When the adjustable headrest assembly comprises more than two connecting sockets, at least two of the backrest sockets and/or the headrest sockets can be disposed along the rear-front backrest and/or headrest axis and/or the lateral backrest and/or headrest axis, respectively.For example, at least two headrest sockets can be disposed along the rear-front headrest axis, and/or at least two backrest sockets can be disposed along the lateral backrest axis. Accordingly, the headrest can be adjusted forward, with respect to the backrest, by sliding the first arm into a backrest socket and by sliding the second arm into a rear headrest socket, disposed behind another headrest socket along the rear-front headrest axis. Additionally, the coupling member can be pivoted along its longitudinal axis such that the second arm can be disposed in front of the first arm along the rear-front axis. Alternatively, the headrest can be adjusted backwards, with respect to the backrest, by sliding the first arm into a backrest socket and by sliding the second arm into a front headrest socket, disposed in front of another headrest socket along the rear-front headrest 0274369345-01 - 4 -278551/2 axis. Additionally, the coupling member can be pivoted along its longitudinal axis such that the second arm can be disposed behind the first arm along the rear-front axis.The headrest can be adjusted sideways, with respect to the backrest, by sliding the second arm into a headrest socket and by sliding the first arm into the backrest socket corresponding with the required side disposed along the backrest lateral axis. For example, the headrest can be adjusted to the right of the chair by sliding the first arm into the backrest socket disposed to the right of another backrest socket. Additionally, the coupling member can be pivoted along its longitudinal axis such that the second arm can be disposed to the corresponding side, with respect to the first arm, along the lateral axis of the headrest. For example, the headrest can be adjusted to the right of the chair by pivoting the coupling member along its longitudinal axis such that the second arm can be disposed to the right of the first arm along the lateral axis of the coupling member.Additionally, at least two headrest sockets can be disposed along the lateral headrest axis whereas at least two backrest sockets can be disposed along the rear-front backrest axis.When the headrest assembly comprises two or more headrest sockets, which are disposed along the headrest lateral axis, the headrest can be adjusted sideways, by sliding the second arm into the headrest socket, disposed along the headrest lateral axis, corresponding with the opposite side required. For example, the headrest can be adjusted to the right of the chair by sliding the second arm into headrest socket disposed to the left of another headrest socket. Adjusting the headrest to the left with respect to the backrest can be done as detailed hereinabove mutatis mutandis.When the headrest assembly comprises two or more backrest sockets, which are disposed along the backrest rear-front axis, the headrest can be adjusted forward by sliding the first arm into a front backrest socket disposed in front of another backrest socket along the rear-front backrest axis. Accordingly, the headrest can be adjusted backwards by sliding the first arm into a rear backrest socket disposed behind another backrest socket, along the rear-front backrest axis.When the headrest is adjusted with respect to the backrest by pivoting the coupling member along its longitudinal axis, and when the first and second arms are received at their respective sockets the first and second axes coincide with either the rear-front coupling member axis or with the coupling member lateral axis. 0274369345-01 - 5 -278551/2 The rigid coupling member can comprise a bridging member, such that the first arm and the second arm can be connected to each other by the bridging member. The first arm can be connected to the second arm directly or via the bridging member, such that the first axis can be disposed at an angle a with respect to the second axis, accordingly, the coupling member can have a general lightning-shape. Angel a can vary between 0°,i. e. the first axis can be parallel to the second axis, and 45°. The bridging member, along with angle a created between the first and second arm, can define a distance D between the first axis and the second axis passing through a free end of the second arm, or between the first axis passing through a free end of the first arm and the second axis. The bridging member, and accordingly distance D, can increase the coupling member's influence on the adjustment of the headrest with respect to the backrest, e.g. when adjusting the headrest by pivoting of the coupling member along its longitudinal axis. The greater the distance D is, i.e. the distance between the free end of the first arm and the free end of the second arm, the greater the adjustment of the headrest forward, backwards or sideways can be, as detailed hereinabove.The connecting sockets can comprise a securing member which can be configured to prevent at least the first arm or the second arm from pivoting once received within the at least one backrest socket or headrest socket. Preventing the arms from pivoting once received within the connecting sockets can be a result of a structural design and/or by a physical element. For example, when the securing member is based on a structural design, at least the first arm or the second arm can have a polygon or a nonsymmetrical shape corresponding with at least one of the at least one backrest socket or headrest socket, thereby preventing the arm from pivoting once received within the corresponding socket. For example, the first arm and/or the second arm can have a general rectangular shape, such as a square a rectangle, a hexagon a pentagon or other rectangular shapes, accordingly the at least one backrest socket and/or the headrest socket can also have a corresponding rectangular shape configured to facilitate the first arm and/or the second arm therein. In some embodiments the first arm and/or the second arm can have an oval, a crescent or a nonsymmetrical shape, accordingly the at least one backrest socket and/or the headrest socket can also have a corresponding shape configured to facilitate the first arm and/or the second arm therein. Having a polygon, an oval, a crescent, or a nonsymmetrical shape can help, for example, prevent unintentional pivoting of the arms once received within the sockets.0274369345-01 - 6 -278551/2 In most cases, the shape of the first arm can be the same as the shape of the second arm. However, in some embodiments, the shape of the first arm can be different than that of the second arm, e.g. to enable easy identification of the first arm form the second arm. For example, the arms can have different polygon or nonsymmetrical shapes, different lengths, widths and/or thickness, different colors, or any combination thereof.To improve securement of the arms once received within the corresponding sockets, the first arm or the second arm can be configured to snuggly fit into the at least one backrest socket or headrest socket. For example, the at least one backrest socket and/or the headrest socket can be sized to receive the first and/or the second arm with minimal clearance between the first and/or second arm and the walls of the socket thereby preventing the arms from "wiggling" once received therein.The securing member can be a crack disposed along the first or the second arm configured for sliding receiving within a protrusion of the at least one backrest or headrest sockets, configured to prevent the arms from pivoting once received within the sockets. The protrusion of the connecting sockets, configured to prevent the arms from pivoting can be a slate, a bar or any combination thereof.In some embodiments, the securing member can be a locking member such as a spring bolt lock, a clip-on, a pin or other locking members configured for preventing the arms from unintentionally sliding out of the sockets or pivoting within the sockets.Since the headrest assembly has a unique structural design and does not require a computer algorithm or motors to adjust the headrest, it may be operated by almost any user, such as users having motoric disabilities and/or children. Additionally, it may also be relatively cheep to manufacture or installation, which enables its use at low cost chairs, e.g. simple wheelchairs or car seats. Accordingly, the headrest assembly, can provide an affordable solution, e.g., for users with complex postural seating needs, thereby reducing the cost of a complex wheelchair.

Any one or more of the following features, designs and configurations can be applied to the adjustable headrest assembly according to any aspect of the present disclosure, separately or in various combinations thereof:• The first axis and the second axis can each be vertically oriented, i.e. in a general up-down direction; 0274369345-01 - 7 -278551/2 • The first axis and/or the second axis can be perpendicular to the coupling member rear-front axis and the lateral axis;• The rigid coupling member can be made of a metallic compound such as steel or titanium, plastic compound such as PVC, wood, or any other rigid material.

The above general description has been provided so that the nature of the disclosed subject matter can be generally understood without being limited to specific embodiments and examples. A more specific description is provided in the Detailed Description whilst the following are non-limiting examples of different embodiments of the presently disclosed subject matter:1. An adjustable headrest assembly configured for detachably attaching a headrest to a backrest of a chair, said headrest assembly comprising:at least one backrest connecting socket configurable at said backrest's upper portion;at least one headrest connecting socket configurable at said headrest; and at least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of said backrest socket and said headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of said headrest socket and backrest socket, for detachably mounting said headrest to said backrest at a variety of selected positions.2. The assembly according to Embodiment 1, wherein said first axis and said second axis are disposed at a non-coaxial relation.3. The assembly according to Embodiment 1 or 2, wherein when said assembly comprises more than two connecting sockets, at least two of the backrest sockets are disposed along a rear-front backrest axis or a lateral backrest axis.4. The assembly according to any one of the preceding embodiments, wherein when said assembly comprises more than two connecting sockets, at least two of the headrest sockets are disposed along a rear-front headrest axis or a lateral headrest axis. 0274369345-01 - 8 -278551/2 . The assembly according to any one of the preceding embodiments, wherein when said first and second arms are received at their respective sockets the first and second axes coincides either with a coupling member rear-front axis or a coupling member lateral axis.6. The assembly according to any one of the preceding embodiments, wherein the coupling member is pivoted along its longitudinal axis, thereby changing the orientation of the first arm with respect to the second arm along a coupling member rear-front axis or a coupling member lateral axis.7. The assembly according to any one of the preceding embodiments, wherein the backrest, headrest and coupling member each have a rear-front axis passing therethrough and a lateral axis perpendicular to each one of rear-front axes respectfully, such that the headrest rear-front axis the coupling rear-front axis and the backrest rear-front axis are parallel to each other.8. The assembly according to any one of the preceding embodiments, wherein the first arm and the second arm are connected to each other by a bridging member.9. The assembly according to Embodiment 8, wherein the bridging member along with an angle a created between the first and second arm, can define a distance D between the first axis and the second axis passing through a free end of the second arm.10. The assembly according to any one of the preceding embodiments, wherein the first axis is parallel to the second axis.11. The assembly according to Embodiment 9, wherein the angle a formed between the first axis and the second axis varies between 0° and 45°.12. The assembly according to any one of the preceding embodiments, wherein the first arm or the second arm are configured to snuggly fit into the at least one backrest socket or headrest socket.13. The assembly according to any one of the preceding embodiments, further comprising a securing member configured to prevent at least the first or the second arm from pivoting within the at least one backrest socket or headrest socket.14. The assembly according to Embodiment 13, wherein the securing member is that at least the first arm or the second arm has a polygon or a nonsymmetrical shape corresponding with at least one of said at least one backrest socket or headrest 0274369345-01 - 9 -278551/2 socket, thereby preventing the arm from pivoting once received within the corresponding socket.15. The assembly according to Embodiment 13, wherein the securing member is a crack disposed along the first or the second arm configured for sliding receiving within a portion of the backrest or headrest sockets configured to prevent the arms from pivoting once received within the sockets.16. The assembly according to Embodiment 14, wherein the shape of the first arm is the same as the shape of the second arm.17. The assembly according to any one of the preceding embodiments, wherein the at least one coupling member has a general lightning-shape.18. A chair having a seat portion, a backrest portion and a headrest detachably attachable to the backrest, whereinan upper portion of the backrest is configured with at least one backrest connecting socket;the headrest is configured with at least one headrest connecting socket; andat least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of the backrest socket and the headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of the headrest socket and backrest socket, for detachably attaching the headrest to the backrest at a variety of selected positions.19. The chair according to Embodiment 18, wherein said first axis and said second axis are disposed at a non-coaxial relation.20. The chair according to Embodiment 18 or 19, wherein when comprising more than two connecting sockets, at least two of the backrest sockets are disposed along a rear-front backrest axis or a lateral backrest axis.21. The chair according to any one of Embodiments 18 to 20, wherein when comprising more than two connecting sockets, at least two of the headrest sockets are disposed along a rear-front headrest axis or a lateral headrest axis.22. The chair according to any one of Embodiments 18 to 21, wherein when said first and second arms are received at their respective sockets the first and second axes coincides either with a coupling member rear-front axis or a coupling member lateral axis.0274369345-01 - 10 -278551/2 23. The chair according to any one of Embodiments 18 to 22, wherein the coupling member is pivoted along its longitudinal axis, thereby changing the orientation of the first arm with respect to the second arm along a coupling member rear-front axis or a coupling member lateral axis.24. The chair according to Embodiment 23, wherein when said coupling member is pivoted along its longitudinal axis and said first and second arms are received at their respective sockets, said headrest is adjusted with respect to the backrest.25. The chair according to any one of Embodiments 18 to 24, wherein the first arm and the second arm are connected to each other by a bridging member.26. The chair according to Embodiment 25, wherein the bridging member along with an angle a created between the first and second arm, can define a distance D between the first axis and the second axis passing through a free end of the second arm.27. The chair according to Embodiment 26, wherein the angle a formed between the first axis and the second axis varies between 0° and 45°.28. The chair according to any one of Embodiments 18 to 27, wherein the first axis is parallel to the second axis.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which: Fig. 1Ais a side view of a wheelchair having a headrest assembly, according to an embodiment of the presently disclosed subject matter; Fig. 1Bis a rear side view of a backrest attached to a headrest via a headrest assembly, according to an embodiment of the presently disclosed subject matter; Fig. 2is a front view of a backrest along with backrest connecting sockets, according to an embodiment of the presently disclosed subject matter; Fig. 3is a cross sectional side view of a headrest along with headrest connecting sockets, according to an embodiment of the presently disclosed subject matter; 0274369345-01 - 11 -278551/2 Fig. 4Ais a front view of a coupling member, according to an embodiment of the presently disclosed subject matter; Fig. 4Bis a side view of the coupling member of Fig. 4A, according to an embodiment of the presently disclosed subject matter; Fig. 4Cis a front side view of the coupling member of Fig. 4A, according to an embodiment of the presently disclosed subject matter; Fig. 4Dis a side view of a coupling member, according to an embodiment of the presently disclosed subject matter; Fig. 5Ais a side view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its rear position, according to an embodiment of the presently disclosed subject matter; Fig. 5Bis a side view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its first mid position, according to an embodiment of the presently disclosed subject matter; Fig. 5Cis a side view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its second mid position, according to an embodiment of the presently disclosed subject matter; Fig. 5Dis a side view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its front position, according to an embodiment of the presently disclosed subject matter; Fig. 6Ais a front view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its left position, according to an embodiment of the presently disclosed subject matter; Fig. 6Bis a front view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its mid position, according to an embodiment of the presently disclosed subject matter; Fig. 6Cis a front view of the backrest attached to the headrest via the headrest assembly, when the headrest is at its right position, according to an embodiment of the presently disclosed subject matter; Fig. 7Ais an exposed front view of the backrest, the headrest and the headrest assembly adjusted to the left, according to an embodiment of the presently disclosed subject matter; 0274369345-01 - 12 -278551/2 Fig. 7Bis an exposed front view of the backrest, the headrest and the headrest assembly adjusted to the right, according to an embodiment of the presently disclosed subject matter; Fig. 8Ais a front view of the backrest attached to the headrest via the headrest assembly, when the headrest at its most left position, according to an embodiment of the presently disclosed subject matter; and Fig. 8Bis a front view of the backrest attached to the headrest via the headrest assembly, when the headrest at its most right position, according to an embodiment of the presently disclosed subject matter.

DETAILED DESCRIPTION OF EMBODIMENTS Attention is first made to Fig. 1A illustrating a side view of a chair, such as wheelchair 10 , having a seat portion 104 , a backrest portion 110and a headrest 130 , detachably attachable to the backrest, e.g., via an adjustable headrest assembly 100 . An upper portion of the backrest 110can be configured with at least one backrest connecting socket 112 , and the headrest 130can be configured with at least one headrest connecting socket 132 . An at least one rigid coupling member 120comprises a first arm 122disposed along a first axis 222and configured for sliding receiving within one of the backrest socket 112and the headrest socket 132 , and a second arm 124disposed along a second axis 224configured for sliding receiving within the other one of the headrest socket and backrest socket, wherein the first axis and the second axis are disposed at a non-coaxial relation.Attention is further made to Figs. 1B to 4C illustrating a front and a back view of backrest 110 , a cross section side view of headrest 130and a front, side view and a front side view of a coupling member 120 . The adjustable headrest assembly 100 , configured for detachably mounting a headrest to a backrest of a chair at a variety of selected positions, can comprise at least one backrest connecting socket 112 , at least one headrest connecting socket 132and at least one rigid coupling member 120 . The at least one backrest connecting socket 112can be configured for being mounted to the backrest portion 110 , and can be disposed at an upper portion thereof, whereas the at least one headrest connecting socket 132can be configured for being mounted to the headrest 130 . The at least one rigid coupling member 120comprises a first arm 122disposed along a 0274369345-01 - 13 -278551/2 first axis 222and configured for sliding receiving within one of the backrest socket 112 and/or the headrest socket 132 , and a second arm 124disposed along a second axis 224 configured for sliding receiving within the other one of the headrest socket 132and/or backrest socket 112 , wherein the first axis and the second axis are disposed at a noncoaxial relation, for detachably mounting the headrest 130to the backrest 110 . In some cases, a disability can prevent the user from controlling their head movements and therefore the headrest can be equipped with a head strap 140for fixing the head to the headrest. Accordingly, in order for the user to adjust their head at a required position the headrest may also need to be adjusted according to the user's requirements.The adjustable headrest assembly 100 , the chair, and parts thereof each have a front face, facing forwards, towards a user, an opposite rear face, facing backwards, a rear-front axis 250passing therethrough and a lateral axis 260perpendicular to the rearfront axis, such that the headrest rear-front axis 256the coupling rear-front axis 254and the backrest rear-front axis 252are parallel to each other (best illustrated in Figs. 5A to 5D). In the disclosed embodiment, the front face of the headrest 136and/or the backrest 116can be soft or can comprise an additional cushion, e.g. for supporting the user's head and/or back, whereas the rear face of the headrest 138and/or the backrest 118can be configured for mounting the connecting sockets 112or 132 , thereto.The headrest assembly 100can provide different supporting positions of the headrest 130with respect to the backrest 110by sliding the first arm 122and/or the second arm 124at a required corresponding connecting socket and/or by pivoting the coupling member 120along its longitudinal axis 220 , thereby changing the orientation of the first arm 122with respect to the second arm 124along the rear-front 254or lateral axes 264 , as illustrated in Figs 5A to 7B.The head rest assembly 100can comprise more than two connecting sockets, e.g. to increase the number of positions at which the headrest can be adjusted, with respect to the backrest, and/or for increasing the stability of the connection between the headrest and the backrest. When the adjustable headrest assembly 100comprises more than two connecting sockets, at least two of the backrest sockets 112and/or the headrest sockets 132can be disposed along the rear-front backrest axis 252and/or rear-front headrest axis 256and/or the lateral backrest axis 262and/or the lateral headrest axis 266 , respectively. In the disclosed embodiment, the adjustable headrest assembly 100 , comprises two 0274369345-01 - 14 -278551/2 backrest sockets 112aand 112b , disposed along the lateral backrest axis 262 , and two headrest sockets 132aand 132b , disposed along the rear-front headrest axis 256 .The headrest 130can be adjusted with respect to the backrest 110via the coupling member 120 , e.g. by pivoting it along its longitudinal axis 220 . Pivoting of the coupling member 120can set the orientation of the first arm 122with respect to the second arm 124 .The first arm 122can be connected to the second arm 124directly or via a bridging member 126 , such that the first axis 222can be disposed at an angle a with respect to the second axis 224 , wherein the first axis 222and the second axis 224are disposed at a noncoaxial relation, accordingly, the coupling member 120can have a general lightningshape. The bridging member 126can connect the first arm 122to the second arm 124 , thereby, along with angle a created between the first and second arm, can define a distance D between the first axis 222and the second axis 224passing through a free end of the second arm 124 , best illustrated in Figs. 4B and 4D. The bridging member 120 , and accordingly distance D , can increase the coupling member's influence on the adjustment of the headrest with respect to the backrest, e.g. when adjusting the headrest by pivoting of the coupling member 120along its longitudinal axis 220 . The greater the distance D is, i.e. the distance between a free end of the first arm 122and the free end of the second arm 124 , the greater the adjustment of the headrest forward, backwards or sideways can be, as detailed hereinbelow. In this embodiment the first axis 222is parallel to the second axis 224such that angel a is 0°, however angle a can vary between 0° and 45°.The rigid compiling member 120 , or any part thereof, can be made of a metallic compound, such as steel or titanium, a plastic compound such as PVC, wood, any combination thereof or any other rigid material.Figs. 5A to 5D illustrate the adjustment of the headrest 130forward and/or backwards by using the two headrest sockets 132aand 132b , a backrest socket 112 , and the pivoting of the coupling member 120along its longitudinal axis 220 . Fig. 5A illustrates the headrest 130at its most backwards position, whereas Fig. 5D illustrates the headrest 130at its most forward position, while Figs. 5B and 5C illustrate an intermediate position of the headrest 130 .When adjusting the headrest 130forward the second arm 124can be positioned in front of the first arm 122along the rear-front coupling member axis 254 , such that the first axis 222and second axis 224coincide with the rear-front coupling member axis 254 . 0274369345-01 - 15 -278551/2 The headrest 130can be adjusted forward, with respect to the backrest 110 , e.g. by sliding the first arm 122into one of the backrest sockets 112aor 112band by sliding the second arm 124into the rear headrest socket 132b , disposed behind the front headrest socket 132a , along the rear-front headrest axis 256 . Alternatively, the headrest 130can be adjusted backwards, with respect to the backrest 110 , e.g. by sliding the first arm 122 into one of the backrest sockets 112aor 112b , and by sliding the second arm 124into the front headrest socket 132a , disposed in front of the rear headrest socket 132balong the rear-front headrest axis 256 .The headrest 130can be adjusted forward or backwards, by pivoting the coupling member 120along its longitudinal axis 220 , such that the second arm 124received within the headrest sockets 132aor 132b , can be positioned in front or behind of the first arm 122received withing the backrest sockets 112aor 112b .At the headrest's 130most backwards position, the second arm 124can be received within the front headrest socket 132a , while the first arm 122can be positioned in front of the second arm 124 , along the rear-front coupling member axis 254 , best illustrated in Fig. 5A. Whereas, at the headrest's 130most forward position, the second arm 124can be received within the rear headrest socket 132b , while positioned in front of the first arm 122 , along the rear-front coupling member axis 254 , best illustrated in Fig. 5D, i.e. the coupling member 120is pivoted 180° with respect to that illustrated in Fig. 5A.Figs. 5B and 5C both illustrate the headrest 130at an intermediate position, however, the difference between the two positions (which illustration can be considered to have its headrest 130positioned at a forward position with respect to the other), can be determined by comparing the distance D with distance H, defined as the distance between an imaginary central lines of each one of the two headrests sockets 132aand 132b , illustrated in Fig. 3. For example, in this embodiment, H is greater than D, therefore, when comparing the positions of the headrest 130illustrated in Figs. 5B and 5C with that of Fig. 5A, it is noticeable that solely pivoting of the coupling member 120180° along its longitudinal axis 220 , as illustrated in Fig. 5B, will have a smaller effect on the adjustment of the headrest 130 , with respect to the backrest 110 , than when positioning the second arm 124at the rear headrest socket 132b , as illustrated in Fig. 5C.Reference is now made to Figs. 6A to 6C illustrating a front view of the headrest assembly 100at its left, center, and right positions, respectively. The headrest 130can be 0274369345-01 - 16 -278551/2 adjusted sideways, with respect to the backrest 110,by sliding the first arm 122into the backrest socket corresponding with the required side, disposed along the lateral backrest axis 262.For example, the headrest 130can be adjusted to the right of the backrest 110, by sliding the first arm 122into backrest socket 112bdisposed at the right side of the backrest 110,as illustrated in Fig. 6C. Alternatively, the headrest 130can be adjusted to the left of the backrest 110,by sliding the first arm 122into backrest socket 112adisposed at the left side of the backrest 110,as illustrated in Fig. 6A. To form the center position, a portion of the first arm 122is received within a portion of the right backrest socket 112a and the other portion of the arm is received within a position of the left backrest socket 112b , as illustrated in Fig. 6B. The coupling member 120and/or the connecting sockets 122and 132can comprise a securing member, best illustrated in Figs. 2 and 6A to 6C, configured to prevent the arms 122and/or 124from pivoting once received within each one of the sockets. The securing member can be a structural feature, such as a locking arrangement having complimentary elements, disposed along the arms and the sockets, or a shape design feature detailed hereinbelow. In this embedment, each one of the connecting sockets 112and 132and arms 122and 124comprise a part of the securing member. For example, the arms 122and 124comprise carks 123and 125,disposed along the first or the second arm, respectively, which can be configured for sliding receiving within an inward protruding portion of the backrest sockets or headrest sockets, such as slates 113or slates 135,configured to prevent the arms from pivoting once received within the sockets. It should be noted that slates 113and/or 135can be any other protruding portions, such as bars, or pins . To improve securement of the arms within the corresponding sockets the first arm 122and/or the second arm 124can be configured to snuggly fit into the at least one backrest socket or headrest socket. For example, the backrest socket and/or the headrest socket can be sized to receive the first and/or the second arm with minimal clearance between the first and/or second arm and the walls of the socket thereby preventing the arms from "wiggling" once received therein. In some embodiments, the securing member can be a locking member such as a spring bolt lock, a clip-on, a pin or other locking members configured for preventing the arms from unintentionally sliding out of the sockets or pivoting within the sockets.The prevention of the arms from pivoting once received within the connecting sockets can also be accomplished by having a securing member in the form of a corresponding shape design. For example, as the shape design securing member can be 0274369345-01 - 17 -278551/2 that, at least the first arm 122or the second arm 124can have a polygon or a nonsymmetrical shape corresponding with at least one of the at least one backrest socket 112or headrest socket 132,thereby preventing the arm from pivoting once received within the corresponding socket. As illustrated, the first arm 122and/or the second arm 124have a general rectangular shape, accordingly the backrest sockets 112and/or the headrest sockets 132also have a corresponding rectangular shape configured to facilitate the first arm 122and/or the second arm 124therein.The first arm and/or the second arm may have other polygon shapes, an oval shape, or a nonsymmetrical shape, and accordingly the backrest sockets and/or the headrest sockets can also have a corresponding shape configured to facilitate the first arm and/or the second arm therein. Having a polygon, an oval, or a nonsymmetrical shape can help, for example, prevent unintentional pivoting of the arms once received within the sockets. For example, Figs. 7A to 8B illustrate that the first arm 122and the second arm 124have a general square shape.In this embodiment, the shape of the first arm 122can be the same shape as the of the second arm 124.However, in some embodiments, the shape of the first arm can be different than that of the second arm, e.g. to enable easy identification of the first arm form the second arm. For example, the arms can have different polygon or nonsymmetrical shapes, different lengths, widths and/or thickness, different colors, or any combination thereof.Figs. 7A and 7B illustrate an exposed front view of the backrest 110 , the headrest 130and the headrest assembly 100adjusted to the left side and to the right side of the backrest 110,respectively using a coupling member 720having a square shaped first arm 722and a square shaped second arm 724 . As illustrated, the headrest 130can be adjusted sideways with respect to the backrest 110,by pivoting the coupling member 120along its longitudinal axis 220.For example, adjusting the headrest 130sideways can be done by positioning the second arm 724at either side of the first arm 722 , such that the first axis 222and the second axis 224coincide with the coupling member lateral 264.Once pivoted according to the required side, the first arm 720can be received within one of backrest sockets 112and the second arm 724can be received within one of the headrest sockets 132.As illustrated in Fig.7B, the headrest 130can be adjusted to the right with respect to the backrest 110,when the second arm 724is positioned to the right of the first arm 722.Accordingly, when positioning the second arm 724to the left of the first arm 0274369345-01 - 18 -278551/2 722,the headrest 130can be adjusted left, with respect to the backrest 110,as illustrated in Fig. 7A.The headrest assembly 100can comprise additional headrest sockets disposed along the headrest lateral axis 266,enabling the headrest 130to be adjusted sideways, with respect to the backrest 110,by sliding the second arm 724into a headrest socket positioned to the left or to the right of headrest, corresponding with the opposite side required, similar to the adjustment of the headrest forward or backwards, disclosed with respect to Figs. 5A to 5D.Figs. 8A and 8B illustrate a front view of the headrest assembly 100at its extreme left and extreme right positions, respectively, using a coupling member 720having a square first arm 722and a square second arm 724 . To be positioned at its most extreme sideways positions, the headrest 130can be adjusted by pivoting the coupling member 720along its longitudinal axis 220 , as detailed with respect to Figs. 7Aand 7B , by sliding the first arm 722into the backrest socket 112corresponding with the required side disposed along the backrest lateral plain 262,and by sliding the second arm 724into the headrest socket 132,disposed along the headrest lateral plain 266,corresponding with the opposite side required. For example, the headrest 130can be adjusted to the extreme right of the backrest 110by pivoting the coupling member 720along its longitudinal axis 220 such that the second arm 724is positioned to the right of the first arm 722along the coupling member lateral axis 264,by sliding the first arm 722into backrest socket 112d disposed at the right side of the backrest 110and by sliding the second arm 724into headrest socket 132cdisposed at the left side of the headrest 130,as illustrated in Fig. 8B. Respectively, the headrest 130can be adjusted to the extreme left of the backrest 110by pivoting the coupling member 720along its longitudinal axis 220such that the second arm 724is positioned to the left of the first arm 722along the coupling member lateral plain 264,by sliding the first arm 722into backrest socket 112adisposed at the left side of the backrest 110and by sliding the second arm 724into headrest socket 132ddisposed to the right of the headrest 130. 0274369345-01

Claims

- 19 - CLAIMS:

1. An adjustable headrest assembly configured for detachably attaching a headrest to a backrest of a chair, said headrest assembly comprising:at least one backrest connecting socket configurable at said backrest's upper portion;at least one headrest connecting socket configurable at said headrest; and at least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of said backrest socket and said headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of said headrest socket and backrest socket, for detachably mounting said headrest to said backrest at a variety of selected positions.

2. The assembly of Claim 1, wherein said first axis and said second axis are disposed at a non-coaxial relation.

3. The assembly of Claim 1, wherein when said assembly comprises more than two connecting sockets, at least two of the backrest sockets are disposed along a rearfront backrest axis or a lateral backrest axis.

4. The assembly of Claim 1, wherein when said assembly comprises more than two connecting sockets, at least two of the headrest sockets are disposed along a rearfront headrest axis or a lateral headrest axis.

5. The assembly of Claim 1, wherein when said first and second arms are received at their respective sockets the first and second axes coincides either with a coupling member rear-front axis or a coupling member lateral axis.

6. The assembly of Claim 1, wherein the coupling member is pivoted along its longitudinal axis, thereby changing the orientation of the first arm with respect to the second arm along a coupling member rear-front axis or a coupling member lateral axis.0274369336-01 - 20 -

7. The assembly of Claim 1, wherein the backrest, headrest and coupling member each have a rear-front axis passing therethrough and a lateral axis perpendicular to each one of rear-front axes respectfully, such that the headrest rear-front axis the coupling rear-front axis and the backrest rear-front axis are parallel to each other.

8. The assembly of Claim 1, wherein the first arm and the second arm are connected to each other by a bridging member.

9. The assembly of Claim 8, wherein the bridging member along with an angle a created between the first and second arm, can define a distance D between the first axis and the second axis passing through a free end of the second arm.

10. The assembly of Claim 1, wherein the first axis is parallel to the second axis.

11. The assembly of Claim 9, wherein the angle a formed between the first axis and the second axis varies between 0° and 45°.

12. The assembly of Claim 1, wherein the first arm or the second arm are configured to snuggly fit into the at least one backrest socket or headrest socket.

13. The assembly of Claim 1, further comprising a securing member configured to prevent at least the first or the second arm from pivoting within the at least one backrest socket or headrest socket.

14. The assembly of Claim 13, wherein the securing member is that at least the first arm or the second arm has a polygon or a nonsymmetrical shape corresponding with at least one of said at least one backrest socket or headrest socket, thereby preventing the arm from pivoting once received within the corresponding socket.

15. The assembly of Claim 13, wherein the securing member is a crack disposed along the first or the second arm configured for sliding receiving within a portion of the 0274369336-01 - 21 - backrest or headrest sockets configured to prevent the arms from pivoting once received within the sockets.

16. The assembly of Claim 14, wherein the shape of the first arm is the same as the shape of the second arm.

17. The assembly of Claim 1, wherein the at least one coupling member has a general lightning-shape.

18. A chair having a seat portion, a backrest portion and a headrest detachably attachable to the backrest, whereinan upper portion of the backrest is configured with at least one backrest connecting socket;the headrest is configured with at least one headrest connecting socket; andat least one rigid coupling member comprising a first arm disposed along a first axis and configured for sliding receiving within one of the backrest socket and the headrest socket, and a second arm disposed along a second axis configured for sliding receiving within the other one of the headrest socket and backrest socket, for detachably attaching the headrest to the backrest at a variety of selected positions.

19. The chair of Claim 18, wherein said first axis and said second axis are disposed at a non-coaxial relation.

20. The chair of Claim 18, wherein when comprising more than two connecting sockets, at least two of the backrest sockets are disposed along a rear-front backrest axis or a lateral backrest axis.

21. The chair of Claim 18, wherein when comprising more than two connecting sockets, at least two of the headrest sockets are disposed along a rear-front headrest axis or a lateral headrest axis. 0274369336-01 - 22 -

22. The chair of Claim 18, wherein when said first and second arms are received at their respective sockets the first and second axes coincides either with a coupling member rear-front axis or a coupling member lateral axis.

23. The chair of Claim 18, wherein the coupling member is pivoted along its longitudinal axis, thereby changing the orientation of the first arm with respect to the second arm along a coupling member rear-front axis or a coupling member lateral axis.

24. The chair of Claim 23, wherein when said coupling member is pivoted along its longitudinal axis and said first and second arms are received at their respective sockets, said headrest is adjusted with respect to the backrest.

25. The chair of Claim 18, wherein the first arm and the second arm are connected to each other by a bridging member.

26. The chair of Claim 25, wherein the bridging member along with an angle a created between the first and second arm, can define a distance D between the first axis and the second axis passing through a free end of the second arm.

27. The chair of Claim 26, wherein the angle a formed between the first axis and the second axis varies between 0° and 45°.

28. The chair of Claim 18, wherein the first axis is parallel to the second axis. 0274369336-01