RU2197881C2 - Bed-sofa transformation apparatus - Google Patents

Abstract

FIELD: furniture production. SUBSTANCE: bed-sofa has rigid carcass resting upon legs and telescopically transformable part connected to carcass. Carcass has rear wall, sides, and back, behind which cavity for receiving head rest is positioned, when bed-sofa is in "bed" position, tie rod provided with rollers and adapted for connecting sides at front end, and front lower tie-rod arranged between sides and imparting rigidity to construction. Seat section frame is adapted for smooth movement over rollers. Guiding rollers for head rest section, guiding rollers for bracket and guides for carcass are mounted on sides. Transformable part has head rest section with side rollers attached thereto for moving along guides on sides, frame with seat section attached to frame top, stops for fixing in extreme positions, and roller guides. Frame is pivotally connected to head rest section through brackets, on which rollers are mounted for providing smooth displacement of head rest section. Foot rest section frame is telescopically connected to seat section frame. Frame carries front and rear roller supports fixed for displacement of foot rest section over floor, roller support levers and connecting levers, which are pivotally attached to frame. Rear roller supports and levers for roller supports are joined through spring-type tie rods to provide for resilient folding of construction. Foot rest section is rigidly fixed on supporting lever of transformation mechanism. For providing transformation without use of manual force, a system may be built in, which comprises two electric drives. First electric drive is adapted for moving bed sections in horizontal plane and comprises electric engine with reducer, cable, telescopic tube system and device for moving said tubes. Second electric drive comprises electric engine with reducer and chain drive for actuating transformation mechanism levers. Such construction allows furniture to be transformed from "bed" position to "seat" position and vice versa without applying substantial manual force. EFFECT: increased efficiency, simplified construction and wider operational capabilities. 2 cl, 5 dwg

Description

 The alleged invention relates to the furniture industry, in particular to transformable upholstered furniture.

 Known transformable upholstered furniture by author. testimonial. USSR 1509029, class A 47 C 17/13, 1989. The sofa bed consists of three sections, where the head section and the seat section are pivotally connected, and the additional leg section in the assembled state is in the drawer and is not connected to the seat section.

 To transform the sofa bed to the "bed" position, it is necessary to individually move the seat and backrest to the "bed" position, extend the cavity for storing the foot section, and move the foot element to the working position.

The disadvantage of this sofa bed is the large number of manipulations associated with the transformation of furniture, difficulty sliding, carried out with the help of bars, low reliability of the articulated lever mechanism, the need for 180 ^° rotation of the foot element.

 The closest analogue is the design of furniture according to the patent of Germany 4100469, cl. A 47 C 17/13, 1991, consisting of a frame with rails on which the rear wall and sidewalls are attached, and three sections - sections for the head, sections for the seat and sections for the legs, the "section of the seat" is mounted on the frame of the section of the seat, section for legs is mounted on top of the "trapezium" articulated linkage mounted on the frame of the foot section, the frame of the foot section has telescopic connection with the frame of the seat section, the sofa bed having a back that is permanently attached to the rear wall and sides, forming a cavity for head section installation in the "sofa" position, the guide rollers for the head section mounted on the sidewalls, the rollers mounted on the head section, the brackets connecting the head section and the seat section, the upper and lower guides for the rollers in the frame of the seat section, the rollers fixed to the section frame for legs. An analogue of an automatic control system is the application of Germany 4425116, cl. A 47 C 17/13, 1996.

 The disadvantage of this sofa bed is the inability to install it on the legs, difficulty sliding and the resulting distortions, the stiffness of the folding section for the legs.

 The technical result of the alleged invention is the creation of a sofa bed of a new design, having in the "sofa" position the legs, and in the "bed" position - on the roller bearings, allowing with minimal effort and manipulation to transform it from one position "sofa" to position " bed".

 The specified technical result is achieved due to the fact that the sofa bed has a rigid frame with support on legs and a telescopically transformable part connected to it. The rigid frame consists of a back wall, sidewalls, a back, behind which a cavity for the head section is formed in the “sofa” position, as well as ties with rollers connecting the sidewalls from the front end and ensuring smooth movement of the frame of the seat section along with the front lower ties between the sidewalls, providing structural rigidity. On the sidewalls there are roller guide sections for the head, bracket roller guides and frame guides.

The transformable part consists of:
sections for the head with side rollers attached to it for moving along the guides on the sidewalls;
the frame of the seat section with the seat section mounted on top of it, and pivotally connected to the head section using special brackets on which the bracket rollers are mounted, ensuring the smooth movement of the head section. In the upper part of the frame of the seat section there are stops to ensure that the seat section is locked in the extreme positions ("sofa", "bed"). The frame of the seat section also includes upper and lower guides for rollers made with flanges. Between the guides mounted clamps with rollers, restricting the movement of rollers made with flanges. Under the lower guides are brackets with rollers that provide lifting of the foot section when rolling it onto the frame guides.

 The frame of the foot section has a telescopic connection with the frame of the seat section, due to the installation of rollers with flanges mounted on the guides of the section section, mounted on the frame of the foot section when set to the "sofa" position.

 The foot section is rigidly fixed to the support arm of a "trapezoid" type mechanism, consisting of a system of levers: support, small, large, with a roller support and communication. On the frame of the foot section are attached: rollers made with flanges; guide sections for legs - to move the frame section of the seat; front and rear roller bearings for moving foot sections on the floor; levers of roller bearings and communication levers are hinged to the frame of the foot section. The rear roller bearings and the levers of the roller bearings are connected by spring ties, which ensures soft construction.

 The frame and the transformable part are connected as follows: the seat section frame is hung on the screed with rollers, the bracket rollers are installed on the bracket roller guides, the head section rollers are on the head section roller rollers, the frame rollers are on the frame guide.

 For transformation, excluding manual force, a system consisting of two electric drives can be integrated.

 The system has a built-in electric drive, consisting of an electric motor and a chain transmission, which provides structure addition.

 The disadvantage of this electric drive is its low reliability.

 The proposed system consists of two electric drives, the first of which consists of an electric motor with a gearbox, a cable, a telescopic pipe system and a device that serves to move these pipes. This electric drive carries out horizontal movement of sections of a sofa. The second electric drive consists of an electric motor with a gearbox, a chain transmission, which actuates the levers of a trapezoid mechanism.

 In FIG. 1 shows a sofa bed in the "bed" position (with the sidewall removed); figure 2 - sofa bed in an intermediate position with a lowered section for the legs; figure 3 sofa bed with the assembled section of the seat; in FIG. 4 sofa bed in the "sofa" position; figure 5 is a diagram of a mechanism with an electric drive.

 The proposed sofa bed consists of: a frame with legs 1, guides of the frame 2, on which the frame rollers 3 are mounted, mounted on the frame of the seat section 4. On the frame of the seat section 4, the seat section 5 is attached. There is a screed with rollers 6 in the front of the frame. In the frame of the seat section 4, there are upper 7 and lower 8 guides, between which there are rollers with flanges 9, mounted on the frame for the leg section 10. On the frame of the section of the seat 4, with the help of special brackets 11, a section for the head 12 is attached, which has side rollers 13 chipped Sliding along the guides 14 on the sidewalls 15. The sidewalls 15 are fastened with a screed with rollers 6 and a rear wall 16, onto which a backrest 17 is attached at a slight angle, attached by the ends to the sidewalls 15 and forming a cavity, where the head section is located in the “sofa” position 12. On the brackets 11, the brackets of the brackets 18 are mounted, mounted on the guides of the rollers of the brackets 19. On the frame of the seat section 4 there are stops 20 and 21. On the guides 8, latches with a roller 22 are installed.

 A bracket with a roller 23 is mounted on the guides 7. The foot section 24 is mounted on the support arm 25 and rests on the frame of the foot section 10, thereby reducing the load on the support arm 25. A trapezoid-type transformation mechanism is pivotally attached to the frame of the foot section 10. consisting of a system of levers: support 25, large 26, small 27, with roller support 28 and communication lever 29. Fastening is carried out using a lever with roller support 28 and communication lever 29. Two legs are installed on the frame of the foot section 10 for moving on the floor pairs of roller bearings - rear 30 and front box 31. Spring ties 32 are installed between the rear roller bearings 30 and the levers with the roller bearings 28. To move the bracket with the roller 23 when raising the leg section to the “sofa” position, the guide frames of the leg section 33 are installed. To lower the leg section 24 during transformation, the loop section 34 is attached to the frame for the leg section 10.

 Along with the manual method of transformation, an electromechanical method with remote control is provided in the design.

 For this, a system of two electric drives is used.

 The first electric drive consists of an electric motor with a gearbox 35 and a telescopic device of three pipes of various diameters 36-38. The end of the thinnest pipe 36 is pivotally connected to the frame of the leg section 4 and connected to the flexible cable 40 passing through the telescopic device. The pipe of the largest diameter 38 is rigidly fixed to the frame 1. On the output shaft of the gearbox of the first electric drive are fastened feed 41 and pinch rollers 42, between which there is a flexible cable 40. The free end of the cable is placed in the pipe 43, mounted on the rear wall of the sofa 16.

 The second electric drive consists of an electric motor with gear 39 for lowering (raising) the section for the legs 24.

 The second electric drive is designed to control the lift of the foot section 24 and consists of a second electric motor with a gear 39 mounted on the frame of the foot section 10. The output end of the gear shaft using a chain gear 44 is connected to the axis of the communication lever 29.

 When transforming furniture from the position of "bed" - figure 1 to the position of "sofa" - figure 4, the furniture goes through intermediate positions - figure 2 and 3.

 To lower the leg section 10, it is necessary to pull on the flexible loop 34, while the "trapezoid" type mechanism with the leg section 23 fixed on it will lower to the frame of the leg section 10. The latch with the roller 22 temporarily restricts the movement of the leg section 4 under the section for sitting 5.

 To further transform the furniture into the “sofa” position, it is necessary to exert sufficient force to lift the frame roller 3 onto the guide of the frame 2. Then the head section system - seat section - foot section frame will move as follows: head section 12, resting on the rollers 13 , will move along the guides 14 on the sidewalls 15 behind the back 17 and will be installed vertically. In this case, the frame of the seat section 4, having rolled on the screed rollers 6 to the extreme left position, is set to the “sofa” position. The latch with the roller 22 will slide onto the guide of the frame 2, which will ensure that the latch with the roller 22 is lifted and the roller 9 of the frame of the leg section 10 is released, after which it will be possible to freely roll the leg section 24 on the frame of the leg section 10 under the seat section 4. When the movement of the section for the legs 24, the guide frame of the section for the legs 33 is rolled onto the latch with the roller 22, while the frame section of the legs 10 is lifted from the floor.

 This sequence of assembly of the sections is necessary because the frame of the section for seating 4 does not have supports moving on the floor, and therefore it should occupy the leftmost position (see figure 3).

 The transformation of furniture from the "sofa" to the "bed" position occurs in the reverse order.

 When using an electric drive, the telescopic pipe system 36-38 is extended. When the sections are completely rolled out, the limit switch of the electric motor with the reducer 35 is triggered, after which the electric drive 39 starts to lower (raise) the frame of the foot section 24. After the complete transformation to the "bed" position, the limit switch (not shown) of the electric drive 39 is activated and the electric drives are completely turned off .

 In the proposed furniture, the legs are metal, the back wall is made of plywood, the sides are made of plywood. Hardwood guides are mounted on the sidewalls. Section for the head, section of the seat, section for the legs are made of the same type from a hard base and soft pillows, trimmed with furniture material. Frames made of pipes. Brackets and elements of the "trapezoid" type mechanism are made of thick sheet steel by stamping. The rollers can be metal or plastic.

Claims (2)

 1. Sofa bed having a rigid frame consisting of a rear wall, sidewalls with side roller guides, a backrest attached to the rear wall and sidewalls from above, forming in the “sofa” position a cavity for accommodating the head section, as well as a transformable part consisting from the head section, the seat section and the leg section, where the seat section is mounted on the frame of the seat section, and the leg section on top is mounted on a trapezoid articulated mechanism mounted on the frame of the leg section, the frame of the leg section has telescopic soy distance between the frame of the seat section, the roller guides of the head section, the brackets connecting the head section and the seat section, the upper and lower guides for the rollers in the frame of the seat section, the rollers fixed in the frame of the leg section, characterized in that the frame further has legs , a screed with rollers connecting the sidewalls in front, and the frame of the seat section is hung on the screed with rollers, on the sidewalls there are frame guides and guide rollers of the brackets, frame rollers are mounted on the frame of the seat section, the rollers are the brackets are mounted on brackets, in the upper part of the frame of the seat section there are two position locks in the form of stops, between the upper and lower guides of the seat section there are locks with rollers, under the rails there are brackets with rollers, the trapezoid mechanism is made in the form of a lever system: support, small, large, with a roller support and communication, the rollers installed in the seat section are made with flanges, on the frame of the leg section there are guide sections for the legs, front and rear roller bearings, and the rear roller bearings and growling gy roller bearings are connected by spring ties.  2. The sofa bed according to claim 1, characterized in that there is additionally a system of two electric drives, consisting of a first electric drive made of an electric motor with a gearbox, on the output shaft of which feed and pinch rollers are attached, between which there is a flexible cable passing through a telescopic device consisting of three pipes of different diameters, the end of the thinnest pipe connected to a flexible cable and to the frame of the foot section, and the pipe of the largest diameter mounted on the frame, and the second electric drive nennogo of a motor with reduction gear, the output shaft of which via a chain transmission connected to the lever link.

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