Sleeper sofa

Abstract

To provide a sleeper sofa which can be mutually converted from a sofa to a bed by a simple work and can flexibly cope with a layout change such as a seat face change.SOLUTION: This sleeper sofa 10 is provided with a sofa body 40 formed by laminating a nearly rectangular seat part 30 on a nearly rectangular base 20 and an auxiliary base 50 built in the base 20 of the sofa body 40, and can be used as a bed by drawing out the auxiliary base 50 from the base 20 of the sofa body 40 to the outside. The seat surface part 30 of the sofa body 40 is freely attachable to and detachable from the base 20, and can be attached even in a state of being rotated 180° forward and backward.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sleeper sofa that can be converted into a bed, and more particularly to a sleeper sofa that can be converted from a sofa into a bed with a simple operation. [Background technology]

[0002] Sleeper sofas, which are sofas that can be converted into beds, are also called sofa beds, and many different types have already been commercialized and are used in hospitals, workplaces, homes, etc. Some sleeper sofas can be converted into beds by folding down the backrest to increase the seat area, but there is a limit to how much they can be expanded by simply folding down the backrest, so there are also types that can be expanded by adding or extending the sofa seat.

[0003] Patent Document 1 addresses the issue of "providing a sleeper sofa that can be converted into a bed and can be moved and positioned quickly, easily, and safely by one person without using any force when in sofa form," and discloses a sleeper sofa in which "casters are provided at the bottom end of the sofa body, and a movable section that can be pulled out and stored from the sofa body is pulled out to form a bed, and when stored it becomes a sofa, the movable section is made up of a cushion support base and side panels, and when the movable section is stored the cushion support base is sandwiched between a push-down member and a lift-up member provided in the storage section, so that the bottom ends of the side panels rise above the floor surface FL and do not interfere with movement by the casters (excerpt from Patent Document 1: Abstract)." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-58430 Summary of the Invention [Problem to be solved by the invention]

[0005] The easily movable sleeper sofa (Patent Document 1: Title of the Invention) according to Patent Document 1 has a structure in which, when the movable section that functions as a bed is stored in a storage compartment inside the seat frame, the lower ends of the side panels of the movable section are raised above the floor, and when the movable section is stored and the sofa is in sofa form, the casters are not obstructed, so it can be moved and arranged quickly, easily, and safely by one person without using any force. However, because the seat is fixed to the sofa body, it is structurally impossible to change the sofa from the right armrest to the left armrest (so-called seat change) when using it as a sofa, so it cannot be said that there is a great degree of freedom in layout when arranging it.

[0006] An object of the present invention is to provide a sleeper sofa that can be converted from a sofa to a bed (or from a bed to a sofa) with a simple operation and that allows for a large degree of freedom in layout when arranging it. [Means for solving the problem]

[0007] In order to solve the above problem, the invention described in claim 1 is a sleeper sofa comprising a sofa body made by stacking an approximately rectangular seat portion (i.e., the portion that functions as a cushion when sitting and as a mattress when lying down) on an approximately rectangular base, and an auxiliary base built into the base, which can be used as a bed by pulling out the auxiliary base from the base of the sofa body, and is characterized in that the seat portion of the sofa body is detachable from the base and can be attached even when rotated 180 degrees forward or backward.

[0008] The invention described in claim 2 is the invention described in claim 1, characterized in that a back frame that functions as a component of the backrest is provided on the seat portion of the sofa main body so as to be approximately perpendicular to the seat surface, and an auxiliary seat portion (i.e., the part that functions as a cushion when sitting and as a mattress when lying down) to be placed on an auxiliary base pulled out from the base of the sofa main body is detachably attached to the back frame (i.e., attached by hook-and-loop fasteners, etc.).

[0009] The invention described in claim 3 is characterized in that, in the invention described in claim 1, a plurality of engaging protrusions are provided facing downward around the periphery of the underside of the seat portion of the sofa body, and a plurality of engaging means that can engage with the engaging protrusions are provided around the upper surface of the base. [Effects of the Invention]

[0010] In the sleeper sofa described in claim 1, the seat portion of the sofa main body is detachable from the base and can be attached even when rotated 180 degrees forward or backward, so even if the armrests are provided on the side of the sofa main body opposite the side where the auxiliary base is pulled out (for example, the left side) and the backrest is provided near the rear edge of the seat portion of the sofa main body, by removing the seat portion from the base and rotating it 180 degrees forward or backward and attaching it, it can be converted into a sleeper sofa with reverse specifications (i.e., a sleeper sofa with armrests on the right side). Therefore, the sleeper sofa described in claim 1 has a great degree of freedom in layout when it is arranged, and is highly convenient.

[0011] The sleeper sofa described in claim 2 has an auxiliary seat portion detachably attached to a back frame fixed to the seat portion of the sofa body, so when used as a sofa, the auxiliary seat portion can be used as a back cushion while attached to the back frame, and when used as a bed, the auxiliary seat portion can be removed from the back frame and placed on the auxiliary base to be used as part of the mattress. Therefore, the sleeper sofa described in claim 2 is extremely convenient.

[0012] The sleeper sofa described in claim 3 has a plurality of downward-facing engaging protrusions provided around the periphery of the underside of the seat portion, and a plurality of engaging means that can engage with the engaging protrusions are provided around the upper surface of the base.Therefore, by simply engaging the engaging protrusions on the underside of the seat portion of the sofa body with the engaging means around the upper surface of the base, the seat portion can be attached and detached from the base with just one touch (i.e., easily and in a short amount of time), making it extremely convenient. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory diagram (front view) showing a sleeper sofa (a shows the state in bed configuration, and b shows the state in sofa configuration). [Figure 2] This is an explanatory diagram (front view) showing a sleeper sofa with a see-through interior (a shows the state in bed configuration, and b shows the state in sofa configuration). [Figure 3] 1A and 1B are explanatory diagrams showing a support frame for the seat portion (a is a front view and an enlarged view of the α and β portions in the front view, b is a bottom view, and c is a left side view). [Figure 4] 1A and 1B are explanatory views showing the seat portion (a is a bottom view, and b is an enlarged view of the γ portion in a). [Figure 5] 1A and 1B are explanatory views showing a back claim (FIG. 1A is a front view, and FIG. 1B is a left side view). [Figure 6] FIG. 2 is an explanatory diagram (plan view) showing the base. [Figure 7] 10 is an explanatory diagram showing the state in which the seat portion is removed from the base, rotated, and then attached. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] <Sleeper sofa structure> An embodiment of a sleeper sofa according to the present invention will be described in detail below with reference to the drawings. Figures 1 and 2 show a sleeper sofa 10. The sleeper sofa 10 is a sofa / bed that can be easily converted from a compact two-seater sofa (Figure 1(b)) to a bed (Figure 1(a)).

[0015] The sleeper sofa 10 comprises a sofa main body 40 formed by stacking a substantially rectangular seat portion 30 (i.e., the portion that functions as a cushion when sitting and as a mattress when lying down) on a substantially rectangular base 20, and an auxiliary base 50 made up of an extension wooden frame 51 and side panels 53 that is built into the base 20 of the sofa main body 40 (more specifically, in the storage section 21 of the base 20).The sleeper sofa 10 also comprises a fixed arm wooden frame 90 that functions as an armrest when used as a sofa and as a headboard when used as a bed, and is installed at one end of the sofa main body 40 (the left side in FIG. 1) along a direction perpendicular to the longitudinal direction.

[0016] The seating surface 30 is constructed by placing a flat rectangular parallelepiped elastic sheet 32 ​​made of an elastic material such as urethane foam, which functions as a cushioning material, on a rectangular metal support frame 31 serving as a base, and covering the support frame 31 and elastic sheet 32 ​​with a cover 33, and is designed to be lightweight so that it can be easily lifted by one person. In addition, two back frames 60, 60 are attached at equal intervals at the rear side of the seating surface 30, which function as a backrest when the sleeper sofa 10 is used as a sofa and as a fall prevention guard when it is used as a bed.

[0017] FIG. 3 shows the support frame 31. The support frame 31 is made of rectangular pipes assembled together, with a steel mesh laid out in a grid pattern on one side. The front and rear square pipes each have rectangular, strip-shaped engagement protrusions 80, 80... on the inner surface at both ends of the front and rear square pipes. These protrusions project downward with their plate surfaces facing left and right. These protrusions 80, 80... are used to secure the seat 30 to the base 20. Bolt holes are drilled through these engagement protrusions 80, 80.... Each engagement protrusion 80, 80... is positioned so that it remains in the same position even when rotated 180 degrees (i.e., rotationally symmetrical). Additionally, cylindrical locking members 35, 35... are fixed at equal intervals at a predetermined distance to the rear square pipe of the support frame 31. The front end of the back frame 60 is inserted through these locking members and screwed onto the pipe.

[0018] 4 shows the bottom surface of seat portion 30. Cover 33, which covers support frame 31 and elastic sheet 32, is made up of outer cover 33a formed of woven synthetic resin fabric and inner cover 33b formed of nonwoven synthetic resin fabric, with inner cover 33b being able to be opened from outer cover 33a by fastener 36. Slits 37, 37... of a fixed width are bored in the left-right, front-rear, and rear corners of outer cover 33a (around the roughly elliptical opening), respectively, for inserting strip-shaped engaging protrusions 80. A roughly elliptical reinforcing member 38, which has a slit 39 bored in the center along the left-right direction and covers the periphery of each slit 37 from the surface, is attached to outer cover 33a with slits 39 aligned with slits 37 of outer cover 33a. The reinforcing member 38 is made by sandwiching neoprene rubber between nylon fabrics, and has sufficient elasticity and high breaking strength, so that the slits 37 of the cover 33 can be effectively prevented from breaking.

[0019] The cover 33 entirely covers the support frame 31 and the elastic sheet 32 ​​with the engaging projections 80, 80... of the support frame 31 inserted into the slits 37, 37... (and the slits 39, 39... of the reinforcing members 38, 38...) on the bottom surface and integrated with the inner cover 33b via fasteners 36. As described above, the cover 33 has the inner cover 33b attached to the edge (the substantially oval opening) of the outer cover 33a with fasteners, so that the support frame 31 and the elastic sheet 32 ​​can be wrapped with sufficient (moderate) tension without causing wrinkles or the like.

[0020] 5 shows back frames 60, 60 fixed to the rear side surface of the seat portion 30. The back frames 60 are formed by bending a metal rod into a three-dimensional shape. Each branched end portion of the back frame 60 is inserted into a pair of insertion holes provided at equal intervals at a predetermined distance in a portion located outside the rear side surface of the cover 33, and is detachably fixed (screwed) to the cylindrical locking bodies 35, 35... fixed to the square pipe at the rear of the support frame 31. A synthetic resin reinforcing ring is provided around each insertion hole provided in a portion located outside the rear side surface of the cover 33.

[0021] Auxiliary seating sections 70, each made of foamed synthetic resin that functions as cushioning for the backrest and covered with a woven fabric cover, are removably attached to the back frames 60. The auxiliary seating sections 70 are rectangular, with a height approximately equal to that of the seating section 30 and a width approximately equal to the front-to-rear width of the seating section 30. The vertical width is approximately half the width of the top surface of the auxiliary base 50 when pulled out from the storage section inside the base 20 (i.e., when the two auxiliary seating sections 70, 70 are placed vertically (with their longitudinal direction aligned in the front-to-rear direction) on the top surface of the pulled-out auxiliary base 50, the top surface of the auxiliary base 50 is largely covered). A horizontally elongated attachment cloth 71 of a fixed width is removably attached to the back of each auxiliary seating section 70 with hook-and-loop tape, and the attachment cloth 71 is used to removably attach the auxiliary seating sections 70 to the back frame 60, as shown in FIGS. 1 and 2.

[0022] 6 shows the base 20, which is made by assembling wooden boards into a horizontally long, flat, rectangular pillar. A reinforcing plate 22 of a certain width is suspended from the top surface of the base 20 slightly left of the center, spanning the front and rear. Oval storage holes 23, 23 are drilled symmetrically at the front and rear edges of the reinforcing plate 22 for storing the tabs of the fasteners 36 that join the outer cover 33a and inner cover 33b of the cover 33. A pressing member 54 is fixed to the underside of the reinforcing plate 22 for pressing down the extension wooden frame 51 when storing the extension wooden frame 51 of the auxiliary base 50 in the storage section 21. Furthermore, cylindrical screw bodies (tubular bodies with threaded grooves inside) 24, 24·, which are engaging means for engaging (screwing) with engaging protrusions 80, 80·, provided on the front, rear, left and right ends of the support frame 31, are fitted into the left and right ends of the front and rear plate materials of the base 20 so that they are perpendicular to the plate surface.

[0023] Furthermore, guide plates 25, 25 of a fixed width for guiding the auxiliary base 50 are provided on the front and rear plate members of the base 20, respectively, so as to be parallel with each other when the plate surface is kept horizontal. Furthermore, wheels are attached to the bottom of the base 20 (to facilitate movement), and an opening and closing zipper (not shown) is sewn along the longitudinal direction at the center of the front and rear on the underside of the seat cover of the base 20 to facilitate attachment and detachment to the seat portion 30. In addition, a rectangular magnetic plate (not shown) is fixed to the outer surface of the plate member on the right side of the base 20 to detachably fasten the side panel 53 of the auxiliary base 50 when the extension wooden frame 51 of the auxiliary base 50 is stored in the storage section 21 of the base 20 and used as a sofa. The seat portion 30 is placed on the upper surface of the base 20 configured as described above, and the engagement protrusions 80, 80... of the seat portion 30 are screwed into the cylindrical threaded bodies 24, 24... of the base 20 by bolts and nuts not shown.

[0024] On the other hand, the auxiliary base 50 has an extension wooden frame 51, which is made of wooden plates assembled into a horizontally long, flat, rectangular pillar shape, protruding to the left from the center (center in the height direction) of a side panel 53, which has armrests formed on its upper surface, so as to be perpendicular to the surface of the side panel 53. The front-to-rear width of the extension wooden frame 51 is slightly smaller than the front-to-rear width of the base 20. Also, an iron plate is attached to the inner surface of the side panel 53 below the extension wooden frame 51, for attaching it to the magnetic plate on the right side of the base 20. Meanwhile, long, rectangular parallelepiped slip enhancers 55 made of synthetic resin (polyoxymethylene) are installed on the front and rear of the bottom surface of the extension wooden frame 51 to improve slipperiness when the extension wooden frame 51 is stored in the storage section 21 of the base 20.

[0025] <How to use the sleeper sofa> When using the sleeper sofa 10 configured as described above as a sofa, as shown in Figures 1(b) and 2(b), the extension wooden frame 51 of the auxiliary base 50 is stored in the storage section 21 of the base 20 of the sofa body 40. When storing the extension wooden frame 51 of the auxiliary base 50 in the storage section 21 of the base 20 in this way, the iron plate on the inner surface of the side panel 53 abuts against the magnetic plate on the right side of the base 20, fixing the side panel 53 so that it does not move.

[0026] On the other hand, when using the sleeper sofa 10 as a bed, as shown in FIGS. 1(a) and 2(a), the extension wooden frame 51 of the auxiliary base 50 is pulled outward from the storage compartment 21 of the base 20 of the sofa body 40. Then, the height of the auxiliary base 50 is adjusted using the adjusters installed at the bottom of the side panels 53 so that it is parallel to the floor. The auxiliary seat sections 70, 70 attached to the back frame 60 are then removed and placed lengthwise on the extension wooden frame 51 of the pulled-out auxiliary base 50. The sleeper sofa 10 can be very easily converted from a sofa to a bed by simply pulling the extension wooden frame 51 of the auxiliary base 50 out of the storage compartment 21 of the base 20 and lining up the auxiliary seat sections 70, 70. To convert the sleeper sofa 10 from a bed to a sofa, simply reverse the above steps.

[0027] Furthermore, as described above, the sleeper sofa 10 can be easily converted from a configuration with an armrest on the right side to a configuration with an armrest on the left side (seat replacement). Figure 7 shows the process of such seat replacement. To convert the sleeper sofa 10 to a configuration with an armrest on the left side, first, use a tool or the like to unscrew the cylindrical threaded bodies 24, 24... of the base 20 from the bottom surface of the base 20 and the engaging protrusions 80, 80... of the seat portion 30. Then, lift the seat portion 30 separated from the base 20 and rotate it 180° so that the front and back are reversed. By rotating the seat portion 30 180° so that the front and back are reversed in this way, the sofa can be converted from a sofa with a right armrest to a sofa with a left armrest (seat replacement).

[0028] <Effects of a sleeper sofa> As described above, in sleeper sofa 10, seat portion 30 of sofa main body 40 is detachable from base 20 and can be attached even when rotated 180 degrees forward or backward, so even if armrests are provided on the side of sofa main body 40 opposite the side where auxiliary base 50 is pulled out and a backrest is provided near the rear edge of seat portion 30 of sofa main body 40, seat portion 30 can be removed from base 20, rotated 180 degrees forward or backward, and attached in the opposite orientation. Therefore, sleeper sofa 10 offers a great degree of freedom in layout when it is placed, making it highly convenient.

[0029] Furthermore, since the sleeper sofa 10 has auxiliary seat sections 70 detachably attached to the back frames 60 affixed to the seat section 30 of the sofa body 40, when it is used as a sofa, the auxiliary seat sections 70 can be used as back cushions while attached to the back frames 60 , and when it is used as a bed, the auxiliary seat sections 70 can be removed from the back frames 60 and placed on the auxiliary base 50 to be used as part of the mattress. Therefore, the sleeper sofa 10 is extremely convenient.

[0030] Furthermore, the sleeper sofa 10 has a plurality of downwardly facing engaging protrusions 80, 80... provided around the periphery of the underside of the seat portion 30, and a plurality of tubular screw bodies 24, 24... which are engaging means that can engage with the engaging protrusions 80, around the upper surface of the base 20.Therefore, by simply engaging the engaging protrusions 80, 80... on the underside of the seat portion 30 of the sofa body 40 with the tubular screw bodies 24, 24... on the upper surface of the base 20, the seat portion 30 can be attached and detached to and from the base 20 with just one touch (i.e., easily in a short time), making it extremely convenient.

[0031] In addition, the sleeper sofa 10 has reinforcing members 38 attached around the slits 37, 37, etc. of the cover 33 that covers the seat portion 30, and the parts that are likely to be subjected to stress when the cover 33 is replaced are reinforced, so the cover 33 will not tear or rip even if it is repeatedly replaced for washing or other reasons.

[0032] <Example of changing the sleeper sofa> The sleeper sofa of the present invention is not limited to the aspects of the above-described embodiments, and the configurations of the base, seat, sofa body, auxiliary base, wooden extension frame, side panels, back frame, auxiliary seat, engaging protrusions, fixed wooden arm frame, etc. can be appropriately changed as needed within the scope of the gist of the present invention. For example, the sleeper sofa of the present invention is not limited to the one equipped with two back frames and auxiliary seat parts on the seat part as in the above-described embodiments, but may be equipped with one or three or more back frames and auxiliary seat parts. Furthermore, the sleeper sofa of the present invention is not limited to the one using foam synthetic resin as the cushioning material as in the above-described embodiments, but may be one using springs as the cushioning material, etc. [Industrial Applicability]

[0033] The sleeper sofa according to the present invention has the excellent effects as described above, and can therefore be suitably used as a sleeper sofa that can be easily converted into a sofa and a bed. [Explanation of symbols]

[0034] 10. Sleeper sofa 20. The Foundation 30... Seat part 38... Cylindrical screw body (engaged means) 40··Sofa body 50··Auxiliary base 51··Extension wooden frame 53 Side panel 60··Back frame 70...Auxiliary seat part 80...Engaging protrusion 90··Fixed armrest wooden frame

Claims

1. A sleeper sofa comprising a sofa body formed by stacking a substantially rectangular seat portion on a substantially rectangular base, and an auxiliary base built into the base, which can be used as a bed by pulling out the auxiliary base from the base of the sofa body, The sleeper sofa is characterized in that the seat portion of the sofa body is detachable from the base and can be attached even when rotated 180° forward or backward.

2. A back frame that functions as a component of a backrest is provided on the seat surface of the sofa body so as to be approximately perpendicular to the seat surface, 2. The sleeper sofa according to claim 1, wherein an auxiliary seat portion to be placed on an auxiliary base pulled out from the base of the sofa body is detachably attached to the back frame.

3. The sleeper sofa of claim 1, characterized in that a plurality of engaging protrusions are provided downward around the periphery of the underside of the seat portion of the sofa body, and a plurality of engaging means that can engage with the engaging protrusions are provided around the upper surface of the base.

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