Mechanism for extending a seat

Abstract

Mechanism for extending a seat located under a backrest in furniture, formed from two lifting devices connected to each other by means of a synchronizing element, wherein the lifting devices each consist of a mounting rail which is fixed to an inside of a furniture side panel and includes a front and a rear arm, a lower angled rail attached to the lower seat of the furniture, an upper angled rail attached to the upper seat of the furniture, a rear and a front rail and a spring, wherein the rear strip is equipped with a vertical arm, via which it is rotatably connected to a rear part of the lower angle strip by means of a rivet, wherein the rear strip is rotatably connected at its other end to a rear part of the upper angle strip, wherein the front strip is rotatably connected to the upper angled strip via its upper end, characterized in that the lifting device (1) comprises a base (6) with two arms (7, 8) arranged at right angles to each other and is equipped with a control element (13) which is formed from a vertical arm (16) which transitions at the bottom into a bent horizontal arm (14), wherein the vertical arm (16) of the control element (13) is rotatably connected in the lower part to the rear arm (4) of the mounting strip (3) and in the upper part to the arm (7) of the base (6), wherein the lower part of the front arm (5) of the mounting strip (3) is rotatably connected to a flat strip (19), the other end of which is connected to the base (6), wherein the rear strip (20), having the vertical arm (21), via which it is rotatably connected to the rear part of the lower angle strip (9) by means of the rivet (22), is in turn rotatably connected to the base (6) via its end, wherein the front strip (32) is rotatably connected at one end to the base (6) and at one end to a front part of the lower angle strip (9) via a step (33), wherein the length of the vertical arm (16) of the control element (13) is greater than that of the flat bar (19), wherein the mechanism has an additional synchronization element (2) which connects the two control elements (13) to each other via their horizontal arms (14).

Description

Field of technology:

[0001] The invention relates to a mechanism for extending a seat located under a backrest in furniture. The mechanism is particularly suitable for upholstered furniture such as sofas, armchairs, couches, and similar pieces. State of the art:

[0002] Utility model description PL 66646 Y1 discloses a mechanism for extending a seat located under a backrest in furniture, which is formed from two lever lifting devices connected to each other by means of synchronizing elements.

[0003] Each lifting device consists of an upper angle bracket attached to an upper seat, a lower angle bracket attached to a lower seat, a horizontal mounting rail fixed to the inside of a furniture side panel and shaped like a shelf rail with two short arms perpendicular to it, a front lever in the form of a flat bar, and a rear lever in the form of a flat bar with a short arm perpendicular to the lever. The front lever is pivotally connected at its upper end to the upper angle bracket, at its lower end to the lower angle bracket, and at the bend to the horizontal bar. The rear lever is pivotally connected at its upper end to the upper angle bracket, at its lower end to the horizontal bar, and at its short arm to the lower angle bracket.The horizontal bar is connected to the front lever via its arm by means of a spring.

[0004] This well-known mechanism is used in furniture with a slanted seat and a fixed backrest. The furniture is unfolded by pulling out a seat using a sofa mechanism. This mechanism allows seating furniture to be transformed into loungers and beds. In its folded position, the furniture has a seat inclined towards the backrest, whereas when unfolded using the mechanism, the seats form a bed with its upper surface lying parallel to the floor. Inadequacies of known solutions: Annex New paragraph

[0005] with insertion:

[0005] The known mechanism allows for two extreme positions of a furniture seat. In the first position, the furniture is in its folded position – the seat is tilted towards the backrest. In the second position, the furniture is in its unfolded position – the seats forming a lounger with the upper surface parallel to the floor. However, the design of the known mechanism makes it impossible to choose an intermediate position in which the upper seat would be partially extended from the sofa. This precludes the possibility of enlarging the sofa. There is also no way to create conditions for a more comfortable reclining position parallel to the backrest. Furthermore, the mechanism currently in use only allows for one position of the upper seat when the furniture is in its folded position, i.e., the position in which the seat is tilted towards the backrest.However, it is not possible to choose a position where the upper seat would be parallel to the floor. The aforementioned factors represent a disadvantage in the use of the furniture, as the user's options with the known mechanism are limited.

[0006] Furthermore, EP 2 713 824 B1 describes a mechanism comprising two separate footrests with a multi-part, motor-operated scissor joint, featuring a locking pivot connection which is fixed to a front section of a seat rail and pivotably coupled to a footrest locking connection which is attached to a front motor tube. The mechanism allows only one inclined orientation of the seat during the entire adjustment process. Purpose of the invention:

[0007] To eliminate the aforementioned shortcomings, a mechanism was developed whose design allows for the unfolding of sofa seat sections to reach an intermediate position and the selection of a piece of furniture in a variant favorable to the user, i.e., with a seat lying parallel or at an angle. Solution:

[0008] The mechanism according to the invention for extending a seat located under a backrest in furniture, formed by two lifting devices connected to each other by means of a synchronizing element, wherein the lifting devices each consist of a mounting strip which is fixed to an inside of a furniture side wall and includes a front and a rear arm, a lower angled strip attached to the lower seat of the furniture, an upper angled strip attached to the upper seat of the furniture, a rear and a front strip and a spring, wherein the rear strip is equipped with a vertical arm by means of which it is rotatably connected to a rear part of the lower angled strip by means of a rivet, wherein the rear strip is rotatably connected at its other end to a rear part of the upper angled strip,wherein the front rail is rotatably connected to the upper angled rail via its upper end, the lifting device is characterized in that each base comprises a base with two arms arranged at right angles to each other and is equipped with a control element which is formed from a vertical arm transitioning at the bottom into a bent horizontal arm, wherein the vertical arm of the control element is rotatably connected in its lower part to the rear arm of the mounting rail and in its upper part to the arm of the base, wherein the lower part of the front arm of the mounting rail is rotatably connected to a flat rail, the other end of which is connected to the base, wherein the rear rail, having the vertical arm via which it is rotatably connected to the rear part of the lower angled rail by means of the rivet, is in turn rotatably connected to the base via its end,wherein the front bar is rotatably connected at one end to the base and via a shoulder to a front part of the lower angled bar, wherein the length of the vertical arm of the control element is greater than that of the flat bar, wherein the mechanism has an additional synchronizing element which connects the two control elements to each other via their horizontal arms.

[0009] The bent horizontal arm of the control element has a kidney-shaped cutout, the vertical arm of the control element having a radial longitudinal opening in which a bolt fixed to the upper part of the rear arm of the mounting strip is guided.

[0010] In a first variant, in which the upper surface of the seat is arranged parallel to the floor when the piece of furniture is folded, the rivet connecting the arm of the rear rail to the lower angled rail is mounted in a round through-hole provided in the arm of the rear rail, the shape and diameter of the opening corresponding to the shape and diameter of the rivet in its cross-section.

[0011] In a second variant, in which the upper surface of the upper seat is inclined towards the backrest when the piece of furniture is folded, the rivet connecting the arm of the rear rail to the lower angled rail is arranged in a continuous, kidney-shaped recess in the arm, wherein a pin is mounted in the arm which contacts a lower edge of the lower angled rail, wherein the recess has a different shape than the shape of the rivet in its cross-section, wherein the rivet is displaced in the recess when the mechanism is unfolded and folded, wherein the movement of the rivet is limited by the shape and dimensions of the recess, and wherein the pin moves along the lower edge of the lower angled rail when the mechanism is unfolded and folded.

[0012] The recess is arranged along the longitudinal axis of the arm. The pin is positioned opposite the rivet and is spaced from it in a plane perpendicular to the longitudinal axis of the arm.

[0013] The dimensions of one end of the recess correspond to the diameter of the rivet. The dimensions of the other end of the recess, however, are larger than the diameter of the rivet. The ends of the recess are connected to each other by inclined flanks that transition into arcs at the recess ends. Advantages of the invention (favorable consequences of applying the invention):

[0014] The design of the mechanism according to the invention allows sofa seat sections to be unfolded, an intermediate position to be reached, and the furniture to be configured in a user-friendly manner. The user can choose between two configurations: a piece of furniture in which the seat, when folded, is inclined towards the backrest and, when unfolded, forms a lounger with its upper surface parallel to the floor; or a piece of furniture in which the seat, when folded, is parallel to the floor and, when unfolded, forms a lounger with its upper surface parallel to the floor. In each configuration, an intermediate position is available in which the seat is extended, thus enabling more comfortable relaxation in a reclining position parallel to the backrest.The use of a piece of furniture with a slide-out mechanism for sofa seat sections according to the invention ensures the user comfort of such furniture, improves ergonomics when sitting or lying in a position parallel to the backrest, and increases the functionality of the furniture. The seat sections are unfolded in one movement, without having to remove the backrest. The entire lifting mechanism is extended from under the backrest by means of a rocker arm, together with the sofa sections, without the need for guides. A kinematic coupling system is formed by the use of two synchronizing elements that connect the two lifting mechanisms.

[0015] In one of the embodiments, the position of the upper surface of the seat, inclined at a slight angle of a few degrees, is entirely sufficient to increase seating comfort and ergonomics. A kidney-shaped recess, incorporated into an arm that connects a rear rail to a lower angled rail mounted on the lower seat of the furniture, with a rivet connecting the aforementioned elements of the mechanism located in the recess, and the use of a pin mounted in the arm, positioned at a certain distance from the rivet and contacting the lower edge of the angled rail, ensure the kinematics of the mechanism. This allows the seat sections to be unfolded until they reach a position parallel to the floor and then folded back into their initial position, in which the seat is inclined towards the backrest.The arrangement of the rivet placed in the recess and the pin, which lifts the lower angled strip attached to the lower seat, limits the rotation range of the arms of the mechanism and ensures the execution of a corresponding movement during the unfolding and folding of the seat, thus increasing the user comfort of the piece of furniture with the slide-out mechanism according to the invention. Description of the invention:

[0016] The subject matter of the invention is illustrated in an exemplary embodiment in the drawing, the figures of which show: Fig. 1 - a mechanism in its folded position, in a side view of the piece of furniture with a seat arranged parallel to the floor, Fig. 2 - the mechanism according to Fig. 1 in its unfolded position, in a side view, Fig. 3 - the mechanism according to Fig. 1 in the unfolded state, in a perspective view, Fig. 4 - a right and a left lifting device according to Fig. 1, which are connected to each other using synchronization elements, in a perspective view, Fig. 5 - the mechanism according to Fig. 1, which is arranged in a closed position within the piece of furniture, Fig. 6 - the mechanism according to Fig. 1 in the piece of furniture in a still closed position, after the sofa parts have been pulled out from under the backrest, Fig. 7 - the mechanism according to Fig. 1 in the piece of furniture in a transitional position during the unfolding of sofa seat sections for the sleeping function, Fig. 8 - the mechanism according to Fig. 1 in the piece of furniture in its unfolded position, Fig. 9 - a mechanism in its folded position, in a side view of the piece of furniture with a seat inclined towards the backrest, Fig. 10 - the mechanism according to Fig. 9 in its unfolded position, in a side view, Fig. 11 - the mechanism according to Fig. 9, in its unfolded state, in a perspective view, Fig. 12 - a right and a left lifting device according to Fig. 9, which are connected to each other via synchronization elements, in a perspective view, Fig. 13 - the mechanism according to Fig. 9, which is arranged in a closed position in the piece of furniture, Fig. 14 - the mechanism according to Fig. 9 in the piece of furniture in a still closed position after sofa seat sections have been extended from under the backrest, Fig. 15 - the mechanism according to Fig. 9 in the piece of furniture in a transitional position during the unfolding of sofa seat sections for the sleeping function, Fig. 16 - the mechanism according to Fig. 9 in the piece of furniture in its unfolded position, Fig. 17 - one arm of the mechanism according to Fig. 9 with a continuous cutout, Fig. 18 - Enlarged outline of the recess in the arm of the mechanism according to Fig. 9. Exemplary embodiment (description of the invention):

[0017] A mechanism according to the invention for extending a seat located under a backrest in furniture consists of two lifting devices 1, namely a right and a left lifting device, which are arranged in a box of the furniture and are connected to each other by means of two tubular synchronizing elements 2, 2a.

[0018] The lifting devices 1 each consist of a mounting strip 3, which is designed as a flat strip fixed to an inside of a furniture side wall and including a front arm 5 and a rear arm 4, a base 6 with two arms 7, 8 arranged at right angles to each other, a lower angled strip 9 attached to the lower seat 10 of the furniture and an upper angled strip 11 attached to the upper seat 12 of the furniture.

[0019] The lower part of the rear arm 4 of the mounting rail 3 is rotatably connected to a control element 13, the bent horizontal arm 14 of which has a kidney-shaped cutout 15. A vertical arm 16 is connected at its upper end to the arm 7 of the base 6 and has a radial longitudinal opening 17 in which a bolt 18, fixed to the upper part of the rear arm 4 of the mounting rail 3, is guided. The bolt 18 located in the opening 17 of the arm 16 of the control element 13 limits the rotation of the control element 13. The lower part of the front arm 5 of the mounting rail 1 is rotatably connected to a flat strip 19, the other end of which is connected to the base 6, which has an opening for mounting the lifting device 1 in the furniture.

[0020] The vertical arm 16 of the control element 13 is longer than the flat bar 19, which allows a rocking movement and the extension of the entire mechanism, preventing a collision with the backrest 31.

[0021] A rear rail 20 is rotatably connected to the base 6 and is equipped with a vertical arm 21, via which it is rotatably connected to the rear part of the lower angled rail 9 by means of a rivet 22. The rear rail 20 is rotatably connected at its other end to the rear part of the upper angled rail 11. The lifting device 1 is equipped with a spring 26.

[0022] A front strip 32 has a shoulder 33 and a vertical flat strip 34 with a kidney-shaped cutout 35 at its lower end. The front strip 32 is rotatably connected at one end to the base 6, at the other end to the front part of the upper angled strip 11, and via a shoulder 33 to the front part of the lower angled strip 9. A bolt 36 is mounted on the shoulder 33 of the front strip 32, and a bolt 37 is mounted in the short arm 8 of the base 6, to which the ends of the spring 26 are fixed.

[0023] The synchronizing element 2 of the control element 13 connects two shorter arms 14, which have kidney-shaped cutouts 15. The synchronizing element 2a of the lifting device 1, on the other hand, connects two vertical flat bars 34, which have kidney-shaped cutouts 35.

[0024] In the first variant, the rivet 22 connecting the arm 21 of the rear rail 20 to the lower angled rail 9 is mounted in a round through-hole 38 provided in the arm 21 of the rear rail 20. The shape and diameter of the opening 38 correspond to the shape and diameter of the rivet 22 in its cross-section. In this variant, when the piece of furniture is folded, the upper surface of the upper seat 12 is arranged parallel to the floor.

[0025] In the second variant, the rivet 22 connecting the arm 21 of the rear rail 20 to the lower angled rail 9 is arranged in a continuous, kidney-shaped recess 23 provided in the arm 21. The recess 23 has a different shape than the cross-sectional shape of the rivet 22. In this variant, when the piece of furniture is folded, the upper surface of the upper seat 12 is inclined towards the backrest 31.

[0026] The recess 23 is arranged along the longitudinal axis X of the arm 21. Furthermore, a pin 24 is mounted in the arm 21, which contacts a lower edge 25 of the lower angled strip 9. When the mechanism is unfolded and folded, the pin 24 moves along the lower edge 25, whereby, during unfolding, the lower angled strip 9, and thus also the lower seat 10 of the furniture, is lifted by the pin 24. The pin 24 is arranged opposite and spaced apart from the rivet 22, and is also spaced apart from the recess 23 in a plane Y perpendicular to the longitudinal axis X of the arm 21. The rivet 22, which rotatably connects the rear strip 20 to the lower angled strip 9 via the arm 21, is arranged in the recess 23 of the arm 21.

[0027] When the mechanism is unfolded and folded, the rivet 22 moves within the recess 23, the movement of which is limited by the shape and dimensions of the recess 23. The dimension of one end 27 of the recess 23 corresponds to the diameter of the rivet 22. The dimension of the other end 28 of the recess 23, however, is larger than the diameter of the rivet 22. The ends 27 and 28 of the recess 23 are connected to each other via inclined flanks 29, which transition into arcs 30 of the ends 27 and 28 of the recess 23. Unfolding the piece of furniture is based on pushing out sofa seat sections from under the backrest 31 by means of the mechanism according to the invention until a position selected by the user is reached.

[0028] In the first position, one of the sofa seat sections, namely the upper seat 12, is partially located under the backrest 31 – this is a position intended for sitting, whereas the other of the sofa seat sections, namely the lower seat 10, is hidden in a box of the piece of furniture, as shown in Fig. 5 and Fig. 13 is shown.

[0029] In the second, middle position, one of the sofa seat sections, namely the upper seat 12, is extended to a position where it is only slightly below the backrest 31 – this is a position suitable for both sitting and lying down, but in a position parallel to the backrest, whereas the other sofa seat section, namely the lower seat 10, remains hidden in the cabinet of the piece of furniture, as shown in Fig. 6 and Fig. Figure 14 shows that in this position the partially unfolded upper seat 12 – starting from the backrest 31 – is wider than the upper seat 12 in its first position, i.e. the position intended for sitting.

[0030] Finally, in the third position (end position), the two sofa seat sections, i.e., the upper seat 12 and the lower seat 10, are pushed out and form a sleeping bed, like the Fig. 8 and Fig. As can be seen in section 16. During the process of bringing the sofa into the latter position, there is a transition phase in which the sofa seat parts are moved, as shown in Fig. 7 and Fig. Figure 15 shows that the transition phase ends when the seats are fully unfolded for the sleeping function.

[0031] In contrast, after folding the seat sections, i.e., after returning to the first position, the starting position intended for sitting, in the first variant the upper seat 12 is arranged parallel to the floor, as in the Fig. 5 shown, whereas in the second variant the upper seat 12 is inclined towards the backrest 31 at an angle λ of between 2 and 5 degrees, as shown in the Fig. 13 can be seen.

[0032] In the second variant, when the furniture is unfolded – starting with the transition phase and continuing until the very last moment before the upper seat 12 and the lower seat 10 are fully unfolded – the rivet 22 is located in the lower part (end 28) of the recess 23. Only after the furniture is fully unfolded, when the surfaces of the seats 12 and 10 form a plane, does the rivet 22, after being repositioned within the recess 23, take its place in its upper part (end 27), thus locking the seats 12 and 10 in their sleeping position. Simultaneously, during the transition phase, the pin 24, located below the lower edge 25 of the lower angled strip 9 at a certain distance from the rivet 22, begins to raise the lower angled strip 9 until it reaches a position parallel to the floor.

Claims

[1] Mechanism for extending a seat located under a backrest in furniture, formed from two lifting devices connected to each other by means of a synchronizing element, wherein the lifting devices each consist of a mounting rail which is fixed to an inside of a furniture side panel and includes a front and a rear arm, a lower angled rail attached to the lower seat of the furniture, an upper angled rail attached to the upper seat of the furniture, a rear and a front rail and a spring, wherein the rear strip is equipped with a vertical arm, via which it is rotatably connected to a rear part of the lower angle strip by means of a rivet, wherein the rear strip is rotatably connected at its other end to a rear part of the upper angle strip, wherein the front strip is rotatably connected to the upper angled strip via its upper end, characterized by , that the lifting device (1) comprises a base (6) with two arms (7, 8) arranged at right angles to each other and is equipped with a control element (13) which is formed from a vertical arm (16) which transitions at the bottom into a bent horizontal arm (14), wherein the vertical arm (16) of the control element (13) is rotatably connected in the lower part to the rear arm (4) of the mounting strip (3) and in the upper part to the arm (7) of the base (6), wherein the lower part of the front arm (5) of the mounting strip (3) is rotatably connected to a flat strip (19), the other end of which is connected to the base (6), wherein the rear strip (20), having the vertical arm (21), via which it is rotatably connected to the rear part of the lower angle strip (9) by means of the rivet (22), is in turn rotatably connected to the base (6) via its end, wherein the front strip (32) is rotatably connected at one end to the base (6) and at one end to a front part of the lower angle strip (9) via a step (33), wherein the length of the vertical arm (16) of the control element (13) is greater than that of the flat bar (19), wherein the mechanism has an additional synchronization element (2) which connects the two control elements (13) to each other via their horizontal arms (14). [2] Mechanism according to claim 1, characterized by, that the bent horizontal arm (14) of the control element (13) has a kidney-shaped cutout (15), wherein the vertical arm (16) of the control element (13) has a radial longitudinal opening (17) in which a bolt (18) fixed to the upper part of the rear arm (4) of the mounting strip (3) is guided. [3] Mechanism according to claim 1, characterized by , that the rivet (22) connecting the arm (21) of the rear strip (20) to the lower angle strip (9) is mounted in a round through-hole (38) provided in the arm (21) of the rear strip (20), wherein the shape and diameter of the opening (38) correspond to the shape and diameter of the rivet (22) in its cross-section. [4] Mechanism according to claim 1, characterized by, that the rivet (22) connecting the arm (21) of the rear strip (20) to the lower angle strip (9) is arranged in a continuous, kidney-shaped recess (23) provided in the arm (21), wherein a pin (24) is mounted in the arm (21) which contacts a lower edge (25) of the lower angle strip (9), wherein the recess (23) has a different shape than the shape of the rivet (22) in its cross-section, wherein the rivet (22) is displaced in the recess (23) when the mechanism is unfolded and folded, wherein the movement of the rivet (22) is limited by the shape and dimensions of the recess (23), and wherein the pin (24) moves along the lower edge (25) of the lower angle strip (9) when the mechanism is unfolded and folded. [5] Mechanism according to claim 4, characterized by , that the recess (23) is arranged along the longitudinal axis (X) of the arm (21). [6] Mechanism according to claim 4, characterized by, that the pin (24) is arranged opposite the rivet (22) and is spaced apart from it in a plane (Y) lying transverse to the longitudinal axis (X) of the arm (21). [7] Mechanism according to claim 4, characterized by , that the extent of one end (27) of the recess (23) corresponds to the diameter of the rivet (22), whereas the extent of the other end (28) is greater than the diameter of the rivet (22), wherein the ends (27, 28) of the recess (23) are connected to each other via inclined flanks (29) which transition into arcs (30) of the ends (27, 28) of the recess (23).

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