RU2200448C2 - Transformable upholstered seating and lying furniture and rotary device for transformable upholstered furniture back - Google Patents

Abstract

FIELD: production of furniture. SUBSTANCE: seating and lying furniture has side walls 1 rigidly fixed with respect to one another, back 2 attached to side walls and equipped with detachable cushions, and seat. Seat is composed of front part 3 and rear part 4 arranged for "lying" position and is provided with transformation mechanism. Back 2 is joined to side walls 1 through rotary device 5. Transformation mechanism comprises two pairs of three-hinged levers, each having front lever 6 with small and large arms connected to front and rear parts of seat and to plank-base. Each pair of levers 6,9 is provided with spring 22. Levers of both pairs of transformation mechanism are rigidly joined to one another to provide synchronous operation of both mechanisms and prevents seats from skewing upon folding or unfolding. Rotary device 5 of seat has pair of levers, with one end of each lever being fixed through pivot joint to internal surface of side wall 1 and other end of lever being rigidly attached to end surface of back 2. Pivot joint pin and lever attachment center on end surface of back 2 are offset with respect to one another and longitudinal axis of lever is positioned at an angle to horizontal plane. Levers are made hook-shaped or made in the form of triangle with unequal sides with rounded corners and arced sides or in the form of irregular rectangle with rounded corners. EFFECT: simplified construction of transformation mechanism, increased convenience, enhanced reliability in operation and wider operational capabilities. 5 cl, 11 dwg

Description

 The invention relates to furniture production and can be used in the development of transformable upholstered furniture. Such furniture is widely used in the equipment of premises with a limited area, as it allows its economical use.

 A sofa bed containing a frame is known, in which a trolley with pillows located on it, pivotally connected to each other, a back and a box for linen is placed, the back has two pairs of levers, one of which is pivotally connected to the side parts of the frame, and the other with the lateral surfaces of the box for linen, while the latter is connected with the trolley. A pair of levers is connected to the side surfaces of the drawer by means of a return spring, and the trolley has pads included in the grooves made on the surface of the laundry drawer and interacting with the latches installed on the frame (USSR patent 399096, class A 47 C 17/13, 1973 )

 In the specified well-known furniture product, the lever mechanism design is used, which ensures the interconnected operation of the back and seat. This design experiences significant loads during operation, as a result of which parts are deformed, rigidity deteriorates and the operability of the linkage system and reliability are reduced.

 There is a known mechanism for transforming a sofa bed with a back mounted vertically in the "sofa" position and reclined horizontally in the "bed" position, containing a carrier plate fixed to the base frame, two brackets connected to each other with the possibility of relative rotation around a common center, one of which is fixed on the seat frame, and the other on the back frame, two support rods, each of which is pivotally connected at one end to the carrier plate, and the other to the back bracket with the possibility of relative rotation and seats and backs around a common center, and a one-shoulder pull lever connected to the carrier plate by means of a spring and pivotally connected to a rod placed on the back side, with a two-shoulder drive lever pivotally mounted on the carrier plate and connected to it by one end by tension springs, both drive levers at the free ends have opposite directions, sections bent in a vertical plane, each of which forms a stop for one of the rods in the "sofa" position and in the "to acce ". The support rod located on the back side and both drive levers are pivotally mounted on the carrier plate at one point and have means for fixing the back in the “sofa” position, including a shaped spring-loaded latch part mounted on the back bracket that can be locked and locked to the seat bracket and the carrier plate has a number of holes for rearranging the end of the associated rod placed on the side of the seat (AS USSR 1657140, class A 47 C 17/17, 1991).

 The above-described mechanisms of furniture transformation due to the interconnected operation of the lever mechanism, providing mobility of the back and seat, experience significant stress. The designs of the described analogues of linkage mechanisms are quite complex. During operation, their parts are subjected to deformation, while stiffness deteriorates and the operability of the linkage system as a whole decreases, as a result of which reliability of operation is called into question. In addition, the disadvantage is the limited functionality, as it does not provide a variety of provisions.

 Known transformable upholstered furniture for sitting and lying, including the back and seat, movably mounted on the side walls, while the seat consists of front and rear parts in the "lying" position and is equipped with a transformation mechanism, the back is connected to the side walls using a rotary device, the transformation mechanism contains two pairs of levers, each of which has front and rear levers, which are hinged to the front and rear parts of the seat, the axis of rotation of the front and rear levers laid on a common base plate, rigidly fixed to the side wall (published application of France 2258152, CL A 47 C 17/13, 1975).

 However, the transformation mechanism in the well-known furniture is rather complicated, not reliable enough due to which all the furniture is inconvenient in operation, besides it does not have wide functional capabilities.

 The objective of the invention is to simplify the mechanism of transformation of the seat, improve the reliability of furniture and expand its functionality.

 The specified technical result is achieved due to the fact that the convertible upholstered furniture for sitting and lying includes a backrest and a seat movably fixed on the side walls, while the seat consists of front and rear parts in the "lying" position and is equipped with a transformation mechanism, the back is connected to the side walls using a rotary device, while the seat transformation mechanism includes two pairs of three-joint levers, each of which has front and rear levers with large and small shoulders, large shoulders with hinges connected to the front of the seat, and the small shoulders with the rear of the seat, the axis of rotation of the front and rear levers are located on a common base plate, rigidly fixed to the side wall, while the large and small shoulders of the front and rear levers, respectively, are equal and the distance between the same joints of both levers are equal.

 The front lever with the extreme hinge of the small shoulder, and the rear lever with the middle hinge is connected to the base plate.

 Each pair of levers of the transformation mechanism is equipped with a spring. The levers of both pairs of the transformation mechanism are rigidly interconnected, for example, by a pipe. This ensures the synchronous operation of both mechanisms and prevents distortion of the seats when unfolding - folding.

 A swivel device for the back of transformable upholstered furniture is known, comprising a pair of levers mounted on the side walls, with one end of each of the levers pivotally mounted on the inner side surface of the side wall and the other rigidly fixed to the end surface of the back, and the hinge axis and the center of attachment to the end the back surfaces are offset from each other (published application of France 2768035, CL A 47 C 17/13, 1999).

 The disadvantages of such a rotary device of the back are small functionality, ease of use, design complexity and lack of reliability.

 The technical result, which is achieved by the proposed rotary device of the backrest, is to expand the functionality of the product by adjusting the depth of the seat, which provides high comfort in operation, as well as simplifying the design and increasing the reliability of the rotary device.

 The technical result is achieved in that the swivel device of the back of the convertible upholstered furniture contains a pair of levers, with one end of each lever using a hinge fixed to the inner side of the side wall, and the other end of the lever rigidly fixed to the end surface of the back, with the hinge axis and the center of attachment the lever to the end surface of the backrest are offset relative to each other, and the longitudinal axis of the lever is located at an angle to the horizontal plane. The hinges of the levers are equipped with spring clips. The levers of the swivel device of the backrest are in the form of a loop or a versatile triangle with rounded corners and arched sides, or an irregular quadrangle with rounded corners. Various structural forms of the levers of the rotary device are proposed from the condition of ensuring the manufacturability of their manufacture.

 Figure 1 shows a General view of transformable upholstered furniture.

 Figure 2 shows a view of transformable upholstered furniture in dynamics.

 In FIG. 3 shows a view of transformable upholstered furniture in the "lying" position.

 Figure 4 shows the mechanism of transformation of the seat (levers).

 In FIG. 5 is a kinematic diagram of a seat transformation mechanism.

 In FIG. 6 shows a design of a hinge-shaped swivel device.

 On figa presents a section aa of Fig.6.

 In FIG. 7 shows a design of a rotary device in the form of a versatile triangle with rounded corners and arched sides.

 On figa presents a section aa of Fig.7.

 In FIG. 8 shows a design of a rotary device in the form of an irregular quadrangle with rounded corners.

 On figa presents a section aa of Fig.8.

 Transformable upholstered furniture for sitting and lying includes side walls 1, rigidly fixed relative to each other and movably fixed on the side walls 1, back 2 with removable cushions and a seat, while the seat consists of front 3 and back 4 parts in the "lying" position and equipped with a transformation mechanism, and the back 2 is connected to the side walls 1 using a rotary device 5, while the seat transformation mechanism includes two pairs of three-joint levers, each of which has a front lever 6 with a large 7 and small m with 8 shoulders and a rear lever 9 with a large 10 and a small 11 shoulders. The front lever 6 and the rear lever 9 with hinges 12, 13, respectively, are connected to the front of the seat 3 having a support leg 14.

 The front lever 6 by the extreme hinge 15 of the small shoulder 8, and the rear lever 9 by the middle hinge 16 are connected to the base plate 17. The front lever 6 by the middle hinge 18 by means of the leg support 19, and the rear lever 9 by the extreme hinge 20 of the small shoulder 11 by means of the leg support 21 are connected to the rear of the seat 4. The axis of rotation of the hinges 15, 16 are the axis of rotation of the levers 6 and 9, while the large 7, 10 and small shoulders 8, 11, respectively, of the front 6 and rear 9 levers are equal and the distances between the hinges of the same name 12, 13 and 15, 16 and 18, 20 both levers are equal.

 Each pair of levers 6, 9 of the transformation mechanism is equipped with a spring 22. The levers 6, 9 of both pairs of the transformation mechanism are rigidly interconnected, for example, by a pipe 23. This ensures the synchronous operation of both mechanisms and prevents the seats from skewing when folding - folding.

 The pivoting device 5 (FIGS. 1, 6, 6a) of the back of transformable upholstered furniture contains a pair of levers 24, with one end of each of the levers 24 using a hinge 25 fixed to the inner side of the side wall 1, and the other end of the lever 24 is rigidly fixed to the end the surface of the backrest 2, while the axis of the hinge 25 and the center of attachment of the lever 24 to the end surface of the backrest 2 are offset relative to each other, and the longitudinal axis of the lever 24 is located at an angle to the horizontal plane. The hinges 25 of the levers 24 are provided with spring clips 26.

 The levers 24 of the pivoting device of the backrest 5 are in the form of a loop (Fig. 6, 6a) or a versatile triangle with rounded corners and arched sides (Fig. 7, 7a), or an irregular quadrangle with rounded corners (Fig. 8, 8a). Different structural forms of the levers 24 of the rotary device 5 are proposed from the condition of ensuring the manufacturability of their manufacture.

 The device operates as follows. The seat transformation mechanism is a five-link flat articulated double parallelogram mechanism in which the following relationships between the geometric parameters AB = DE, AC = DF, CB = FE, AD = BE = CF (Fig. 5) are fulfilled, which ensures synchronous rotation of the mechanism links. When transforming the furniture product into the "lying" position (Fig. 3), it is necessary to turn the back 2 from the "A" position counterclockwise to the "C" position (Fig. 2), in which the back 2 is fixed by the spring-loaded latch 26 ( 6, 6a). The front part of the seat 3 with the support leg 14 extends forward and upward, making a circular circular motion clockwise, describing the arc AA, DD of a circle with a radius R = AB = DE (Fig. 4), which corresponds to equal big 7, 10 shoulders front 6 and rear 9 levers (figure 2). At the same time, the rear part 4 of the seat describes an arc CC, FF of a circle with a radius R = CB = FE, which corresponds to equal small shoulders 8, 11 of the front 6 and rear 9 levers. In this case, the rear part 4 of the seat rises up and forward to the level of the front part 3 of the seat, forming with it a single plane under the berth. The spring 22 is thus stretched to its maximum value. The backrest 2 is brought out of the fixed position "C" and counterclockwise by means of the rotary device 5 is set to position "B" (Fig. 1).

 To convert transformable upholstered furniture to the "sitting" position, all actions are performed in the reverse order.

 The depth of the seat is ensured by the design of the rotary device 5 of the backrest 2, which is a lever 24, one end of which is hinged 25 to the inner side of the side wall 1, and the other end is rigidly fixed to the end surface of the backrest 2, while the axis of the hinge 25 and the center of attachment to the end surface of the backrest 2 is offset relative to each other. Due to this displacement, an eccentricity is formed, which allows you to adjust the depth of the seat, expanding the functionality of the furniture. The location of the longitudinal axis of the lever 24 at an angle to the horizontal plane provides a predetermined installation angle of the backrest 2 and, therefore, comfort and ease of use. The spring 26 locks the set position of the backrest 2.

 In the "sitting" position, the backrest 2 can be installed both in the "A" position for a more upright and active landing, and in the "B" position with a greater seat depth and an increased back angle for a relaxed position.

 There are various options for the configuration of the levers 6 and 9 of the seat transformation mechanism and, therefore, various options for connecting the hinges to the structural elements of the furniture, with the prerequisite being the location of the axes of rotation of the levers on a common basis, the equality of the large and small shoulders of the front and rear levers, as well as the distance between the same joints of both levers.

 Thus, in the proposed design of transformable upholstered furniture, separate mechanisms are used to transform the seat and turn the backrest. The mechanism of transformation of the seat allows you to form a berth due to two movable elements - the front and rear of the seat, and the rotary device of the backrest adjusts the length of the berth. In the "sitting" position, the backrest, by means of an autonomous rotary device, adjusts the depth of the seat, which increases comfort and expands the functionality of the furniture.

Claims (5)

 1. Transformable upholstered furniture for sitting and lying, including a seat, consisting of front and rear parts, a transformation mechanism, which is a lever mechanism by which the rear part of the seat, located under the front part, in the "sitting" position rises to the sleeping level surface, backrest and swivel device, characterized in that the seat transformation mechanism includes two pairs of three-hinged levers, each of which has front and rear levers with large and small shoulders, large shoulders by means of hinges connected to the front of the seat, and small shoulders - to the rear of the seat, the axis of rotation of the front and rear levers are located on a common base plate rigidly fixed to the side wall, while the front lever is connected to the base plate by an extreme hinge of the small shoulder and the rear lever by the middle hinge, the big and small shoulders of the front and rear levers, respectively, are equal and the distances between the hinges of both levers are equal.  2. Transformable upholstered furniture for sitting and lying according to claim 1, characterized in that the levers of both pairs of the transformation mechanism are rigidly interconnected.  3. Transformable upholstered furniture for sitting and lying according to claim 1, characterized in that each pair of levers is equipped with a spring.  4. A swivel device for the back of convertible upholstered furniture containing a pair of levers, one end of which is pivotally mounted on the side walls, and the other end is rigidly fixed on the end surface of the back, characterized in that the longitudinal axis of the levers is at an angle to the horizontal plane, and the hinges of the levers are provided spring clips.  5. The swivel device of the backrest of convertible upholstered furniture according to claim 4, characterized in that the levers are in the form of a loop or a versatile triangle with rounded corners and arched sides, or an irregular quadrangle with rounded corners.

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