A draw bench sofa and folding linkage

Abstract

The utility model relates to the field of broaching machine, specifically provide a kind of broaching machine sofa and folding linkage device, including top cross bar, bottom plate frame and be used to the structure of beating up for beating up top cross bar, the structure of beating up includes: up and down connecting rod: two ends are respectively hinged on top cross bar and bottom plate frame;Limit locking link: for participating in the beating up work of beating up structure and can limit stable beating up state;Realize the folding work of beating up and putting down of broaching machine sofa.

Description

Technical Field

[0001] This utility model relates to the technical field of pull-out beds, and more particularly to a pull-out bed sofa and a folding linkage device. Background Technology

[0002] A pull-out sofa is a type of furniture that can be used as both a sofa and a bed. It can be unfolded into a bed by folding or pulling out the sofa.

[0003] In the existing technology, there are two types of folding sofas that can function as both a sofa and a bed. One type allows the sofa back to be folded flat to achieve the function of lying down in a bed, while the armrests on both sides of the sofa can be removed. However, this type of folding sofa is very inconvenient to use. For example, the sofa back is usually placed against the wall, and when it needs to be transformed, the entire sofa needs to be moved to make room for the back to lie flat. This type of sofa is generally quite heavy and difficult to operate. If the space reserved for the placement of this sofa is small and the room is relatively crowded, this type of sofa will rarely be used as a bed. Unless absolutely necessary, no one would be willing to transform it.

[0004] Another type of sofa is the pull-out type, which is relatively simple to operate, but still has many drawbacks. Pull-out sofas typically involve sliding a bed board out from the bottom of the sofa. However, this means the bed board is shorter than the sofa itself. Current technology sometimes allows for height adjustment after the bed board is pulled out, while other technologies use a mattress to level it. Adjusting the height again requires a better height adjustment and support structure, increasing costs and adding to the deformation burden. Using a mattress for leveling is preferable, but a mattress is an elastic and soft material; after prolonged use and deformation, unevenness between the bed board and the sofa will affect the user experience.

[0005] Therefore, a new pull-out bed that can be used as both a sofa and a bed, and a folding structure for the pull-out bed, are needed. Utility Model Content

[0006] The purpose of this utility model is to provide a folding structure to change the folding method of the bed board in the background art in order to solve the problems pointed out in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a linkage device, comprising a top crossbar, a base plate frame, and: Upper and lower connecting rods: both ends are hinged to the top crossbar and the bottom plate frame, respectively; Limit locking linkage: used in conjunction with the upper and lower connecting rods to raise the top crossbar, ensuring a stable raising state during the raising process; The limiting and locking linkage includes a rotating rod, a limiting connecting rod hinged to the middle of the base plate frame, a support rod hinged to the limiting connecting rod, and a top connecting rod integrally connected to the support rod. The other end of the top connecting rod is hinged to the top crossbar, and the other end of the limiting connecting rod is hinged to the base plate frame. One end of the rotating rod is hinged to the base plate frame, and the other end is hinged between the top connecting rod and the support rod. Together with the upper and lower connecting rods and the limiting and locking linkage, the top crossbar is raised. The included angle between the support rod and the top connecting rod is less than 180° and greater than 120°. In the open position, the component of the gravity of the top crossbar acting on the connection between the rotating rod and the top connecting rod in the direction perpendicular to the rotating rod is directed away from the limiting connecting rod.

[0008] Furthermore, in the engaged state, the line connecting the top and bottom of the limit locking linkage is parallel to the upper and lower connecting rods.

[0009] Another technical objective of this application is to provide a pull-out bed sofa that changes the folding method of the bed board in the prior art to solve the problems pointed out in the prior art.

[0010] The technical objective of this application is achieved through the following technical solution: a pull-out sofa, characterized in that it includes a sofa frame and an accommodating space located at the bottom of the sofa frame, wherein a top crossbar, a base frame, and: are slidably connected within the accommodating space. Upper and lower connecting rods: both ends are hinged to the top crossbar and the bottom plate frame, respectively; Limit locking linkage: It works in conjunction with the upper and lower connecting rods to raise the top crossbar and can limit the stable raised state; The limiting and locking linkage includes a rotating rod and a limiting connecting rod, a support rod, and a top connecting rod that are hinged in sequence. The other end of the top connecting rod is hinged to the top crossbar, and the other end of the limiting connecting rod is hinged to the base plate frame. One end of the rotating rod is hinged to the base plate frame, and the other end is hinged between the top connecting rod and the support rod. Together with the upper and lower connecting rods and the limiting and locking linkage, the top crossbar is raised. In the open position, the component of the gravity of the top crossbar acting on the connection between the rotating rod and the top connecting rod in the direction perpendicular to the rotating rod is directed away from the limiting connecting rod.

[0011] Furthermore, a bed board is provided on the top crossbar, and the bed board is at the same height as the sofa.

[0012] Furthermore, the upper and lower connecting rods are hinged to the rightmost end of the top crossbar and located in the middle of the side of the bed board.

[0013] Furthermore, a support plate is vertically fixed at the end of the base plate frame away from the accommodating space, and when the top crossbar is in the open state, the bottom surface of the top crossbar presses against the top surface of the support plate.

[0014] Furthermore, a support plate is vertically fixed at the end of the base plate away from the accommodating space, and a support platform is fixed at the top of the support plate near the accommodating space. The height of the support platform and the top edge of the support plate is equal to the thickness of the top crossbar. In the raised state, the bottom surface of the top crossbar presses on the support platform.

[0015] In summary, the present invention has the following advantages compared with the prior art: 1. During the entire unfolding and folding process, you only need to slide the extended folding structure out of the storage space, lift the top crossbar upwards, and fix it at this position by setting the limit locking link so that the top crossbar is just coplanar with the sofa board surface. At this time, the top crossbar will not deform under pressure, while pulling up the top crossbar can fold it downwards. The folding and unfolding process is smooth and convenient. Attached Figure Description

[0016] Figure 1 Example 1: Schematic diagram of the structure before firing; Figure 2 A schematic diagram of the structure during the firing process in Example 1; Figure 3 This is a schematic diagram of the structure after it has been opened in Example 1; Figure 4 This is a schematic diagram of the force analysis after the extended folding structure in Example 1 is unfolded; Figure 5 This is a schematic diagram of the unfolded extended folding structure in Example 2; Figure 6 This is a schematic diagram of the extended folding structure in Example 3.

[0017] Reference numerals: 1. Sofa frame; 10. Backrest frame; 11. Sofa board; 12. Armrest frame; 120. Slide rail; 2. Accommodation space; 3. Extendable folding structure; 30. Top crossbar; 31. Base plate frame; 310. Limiting post; 32. Upper and lower connecting rods; 33. Limiting locking link; 330. Support rod; 331. Limiting connecting rod; 332. Rotating rod; 333. Top connecting rod; 4. Bed board; 5. Support plate; 50. Support platform; 6. Strap; 7. Pulley. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] Example 1, a pull-out sofa, referring to Figure 1The sofa frame 1 includes left and right armrests 12 and a backrest 10 located between the two armrests 12. A horizontal sofa board 11 is fixed between the backrest 10 and the armrests 12. The bottom of the sofa board 11 and the armrests 12 form an accommodating space 2.

[0020] The accommodating space 2 is provided with an extension folding structure 3, which is slidably connected to the handrails 12 located on both sides. The handrails 12 are provided with slides 120 that are slidably connected to the extension folding structure 3.

[0021] The extended folding structure 3 includes a base frame 31, a top crossbar 30, a bed board 4 fixed to the top surface of the top crossbar 30, upper and lower connecting rods 32 and a limiting locking link 33 respectively hinged to the base frame 31 and the top crossbar 30 at both ends, and a support plate 5 vertically fixed on the base frame 31. The support plate 5 is located at one end of the extended folding structure 3 on the base frame 31 in the direction of extending into the accommodating space 2. The limiting locking link 33 is located at one end of the extended folding structure 3 extending into the accommodating space 2. The two ends of the limiting locking link 33 are respectively hinged to the top crossbar 30 and the base frame 31.

[0022] Combination Figure 2-4 The limiting locking link 33 is hinged to the top horizontal bar 30 at point A, the limiting locking link 33 is hinged to the base plate frame 31 at point B, the upper and lower connecting rods 32 are hinged to the top horizontal bar 30 at point C, and the upper and lower connecting rods 32 are hinged to the base plate frame 31 at point D. In this embodiment, AC is equal to BD. In other embodiments, AC can be slightly greater than or slightly less than BD.

[0023] In this embodiment, the limiting locking link 33, the upper and lower connecting rods 32, and the top crossbar 30 are located on both sides of the bed board 4 and the base frame 31, forming a symmetrical support and folding structure for the bed board 4. The base frame 31 is slidably connected to the slide rail 120. After the base frame 31 is slid out, the height of the top crossbar 30 is adjusted by rotating the upper and lower connecting rods 32. The limiting locking link 33 is used to control the position and posture of the top crossbar 30 during the height adjustment process, and provides stable support for the final state of the height adjustment of the top crossbar 30.

[0024] Combination Figure 4The limiting locking link 33 includes a rotating rod 332, a limiting connecting rod 331, a support rod 330, and a top connecting rod 333. The rotating rod 332 and the top connecting rod 333 are hinged at point E. The top connecting rod 333 and the support rod 330 are integrally connected. The included angle between the top connecting rod 333 and the support rod 330 is less than 180° and greater than 120°. In this embodiment, it is 150°. The other end of the rotating rod 332 is hinged to the base plate frame 31 at point F. The top connecting rod 331 is hinged to the top crossbar 30 at point A. The support rod 330 and the limiting connecting rod 331 are hinged to point G. The other end of the limiting connecting rod 331 is hinged to the base plate frame 31 at point B.

[0025] A limiting post 310 is provided on the base plate frame 31, and an embedding groove for the limiting post 310 to be embedded is provided on one side of the limiting connecting rod 331.

[0026] In the raised state, the top crossbar 30 is parallel to the base plate frame 31, i.e., AC is parallel to BD, and AB / / CD. At this time, the limiting post 310 is located in the embedded groove, which is opened on the top edge line of the limiting connecting rod 331. The limiting post 310 restricts the limiting connecting rod 331 from rotating upward. At this time, the gravity of the top crossbar 30 is downward, ∠C tends to increase, ∠A tends to decrease, and the rotating rod 332 tends to rotate counterclockwise. The limiting connecting rod 331 tends to rotate clockwise around point B, but it is blocked by the limiting post 310 and cannot rotate further, thus restricting the top crossbar 30 from sinking and achieving the stability of the top crossbar 30.

[0027] When the bed board 4 needs to be folded up, pull the top crossbar 30 upward at point C to create a reverse movement, that is: the rotating rod 332 rotates clockwise around point F, the limiting connecting rod 331 rotates counterclockwise around point B, ∠EGB decreases, ∠A first increases and then decreases, point A first moves to the right and then downward until the top crossbar 30 falls and overlaps with the base plate frame 31, completing the folding, and then the base plate frame 31 slides together with the top crossbar 30 into the accommodating space 2.

[0028] The length relationships between the aforementioned rotating rod 332, fixed rod, support rod, and top connecting rod follow the following rules: FE+EG>EG-GB; AE>EF; specifically, in the open state, AB=27.7CM, CD=31.5CM, and BD=27.9cm; AE=13.6CM, BG=7.6CM, EG=9.7CM, BF=14.6CM, EF=6CM; The height difference before and after lifting is 18.5 cm. All measurements are based on the distance from the center point of the screw to the center point of the screw itself, and there may be an error of ±1 mm.

[0029] When unfolded, the bed board 4 is placed on the top crossbar 30 and then the mattress is placed on top. The height of the sofa is the same as the unfolded height, realizing the function of a bed. When the top crossbar 30 is folded and stored in the storage space 2, the sofa can be folded and unfolded.

[0030] To facilitate raising and lowering the bed board 4, a handle is fixed on the top crossbar 30. In this embodiment, a soft pull strap 6 is used as the handle.

[0031] To facilitate sliding the extended folding structure 3 into the accommodating space 2, a pulley 7 is provided at the bottom of the base plate frame 31.

[0032] In the specific implementation process, the extended folding structure 3 is pulled out of the accommodating space 2 by pulling the pull strap 6, and then the pull strap 6 is pulled upward, which lifts the top crossbar 30 upward. During the lifting of the top crossbar 30, point G moves to the lower right, the limiting connecting rod 331 rotates counterclockwise around point B, the rotating rod 332 rotates counterclockwise, and point E moves to the right. When point E moves to the same height as the base plate frame 31, the rotating rod 332 continues to rotate counterclockwise, the limiting connecting rod 331 rotates clockwise around point B, and point G moves to the upper left. Until point G is collinear with the base frame 31, the limiting post 310 on the base frame 31 comes into contact with the limiting connecting rod 331. During the entire lifting process, the top horizontal bar 30 is pulled up from point C by the strap 6. The top horizontal bar 30 is in an inclined state. After point A reaches the highest point, point C falls. The top horizontal bar 30 is in a horizontal state from the inclined state area until point C falls to the end point and stops moving. At this time, it is in the lifting state. The top horizontal bar 30 is parallel to the base frame 31, and the height of the top horizontal bar 30 is the same as the height of the sofa, forming the bed frame.

[0033] The force analysis at this time is as follows Figure 4 F1 represents the weight of the top crossbar 30 and the normal force it experiences. When F1 acts on the upper and lower connecting rods 32, the force at point C is decomposed into a pressure F5 along the direction of the upper and lower connecting rods 32 and a downward force F2 perpendicular to the upper and lower connecting rods 32. At this time, the reaction force F3 of the upper and lower connecting rods 32 on the top crossbar 30 is also present. Therefore, the resultant force of the weight F1 of the top crossbar 30 and the supporting force F3 of the upper and lower connecting rods 32 is F4. F4 and F2 are in the same direction and equal in magnitude. When the force F4 acts on point E, the component of the force on the rotating rod 332 perpendicular to the direction of the rotating rod 332 is to the left, and the rotation trend of the force on the rotating rod 332 is counterclockwise. It can be determined that the component of the force on the limiting connecting rod 331 perpendicular to the direction of the force is clockwise around point B. The limiting post 310 and the limiting connecting rod 331 abut against each other, thus achieving stable support for the entire extended folding structure 3.

[0034] Based on the force analysis above, it can be seen that in order to achieve stability in the spiking state, it is necessary to limit ∠CAE to less than 90° in the spiking state.

[0035] Thus, when point A is subjected to pressure alone, due to the support of the rotating rod 332 at point E, the top connecting rod 333 and the support rod 330 are integrally connected, causing point E to form a fulcrum. When point A is subjected to downward force, point G is subjected to upward force, so that the limiting post 310 and the limiting connecting rod 331 abut against each other, thereby achieving stable support for the entire extended folding structure 3.

[0036] The length of each part should be limited to meet the following condition: when the part is in the open state, (90°-∠EFD)<∠D, and the force of F4 at point E is sufficient to support the entire structure.

[0037] When the top crossbar 30 is pressed, the rotating rod 332 tends to continue rotating counterclockwise, and the limiting connecting rod 331 tends to rotate clockwise. However, due to the locking effect of the limiting post 310, the movement of the limiting connecting rod 331 is prevented. That is, the top crossbar 30 will not move due to the pressure. However, if the pull strap 6 is pulled, the top crossbar 30 will tend to lift upwards, and the limiting connecting rod 331 will rotate counterclockwise. Then, the top crossbar 30 will be folded and stored in the opposite direction of the lifting process, and then pushed into the storage space 2 to realize the storage of the sofa.

[0038] Example 2 differs from Example 1 in that the final state in the raised state is changed by adjusting the lengths of the rotating rod 332, the top connecting rod 333, the upper and lower connecting rods 32, the limiting connecting rod 331, and the support rod 330. In this example, the angle ∠EFB between the rotating rod 332 and the base plate frame 31 after being raised is an obtuse angle, and ∠AEG+∠GEF>180°.

[0039] Since ∠EFB is an obtuse angle, when point A is subjected to pressure, the rotating rod 332 tends to rotate counterclockwise. The rotating rod 332 pulls the support rod 330 away from point B. Moving towards the direction of the rotating rod 332 makes the bed board 4 more stable.

[0040] Example 3, the difference between this example and Example 2 is that, referring to... Figure 6 When the mattress is folded up, ∠AEG + ∠GEF < 180°. In this state, the bed board 4 is more stable. However, when folding, pulling the strap 6 requires the top crossbar 30 to move upwards before folding downwards. This pulling process requires overcoming the weight of the top crossbar 30, the bed board 4, and the mattress, making it relatively strenuous. However, its stability in the supported state is significantly greater.

[0041] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “said,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0042] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A folding linkage device, characterized in that, Including the top crossbar (30), the bottom plate frame (31), and: Upper and lower connecting rods (32): both ends are hinged to the top crossbar (30) and the bottom plate frame (31) respectively; Limiting locking link (33): used to cooperate with the upper and lower connecting rods (32) to raise the top crossbar (30), and the raising operation can limit the stable raising state; The limiting locking link (33) includes a rotating rod (332), a limiting connecting rod (331) hinged to the middle of the base plate frame (31), a support rod (330) hinged to the limiting connecting rod (331), and a top connecting rod (333) integrally connected to the support rod (330). The other end of the top connecting rod (333) is hinged to the top crossbar (30), and the other end of the limiting connecting rod (331) is hinged to the base plate frame (31). One end of the rotating rod (332) is hinged to the base plate frame (31), and the other end is hinged between the top connecting rod (333) and the support rod. Together with the upper and lower connecting rods (32) and the limiting locking link (33), the top crossbar (30) is raised. The included angle between the support rod (330) and the top connecting rod (333) is less than 180° and greater than 120°. In the open state, the component of the gravity of the top crossbar (30) acting on the connection between the rotating rod (332) and the top connecting rod (333) in the direction of the vertical rotating rod (332) is directed away from the limiting connecting rod (331).

2. The folding linkage device according to claim 1, characterized in that, In the engaged state, the line connecting the top and bottom of the limit locking link (33) is parallel to the upper and lower connecting rods (32).

3. A pull-out sofa, characterized in that, Includes a sofa frame (1) and an accommodating space (2) located at the bottom of the sofa frame (1), wherein a top crossbar (30), a base plate frame (31), and: are slidably connected within the accommodating space (2). Upper and lower connecting rods (32): both ends are hinged to the top crossbar (30) and the bottom plate frame (31) respectively; Limiting locking link (33): It works with the upper and lower connecting rods (32) to raise the top horizontal bar (30) and can limit the stable raising state; The limiting locking link (33) includes a rotating rod (332) and a limiting connecting rod (331), a support rod (330), and a top connecting rod (333) that are hinged in sequence. The other end of the top connecting rod (333) is hinged to the top crossbar (30), and the other end of the limiting connecting rod (331) is hinged to the base plate frame (31). One end of the rotating rod (332) is hinged to the base plate frame (31), and the other end is hinged between the top connecting rod (333) and the support rod. Together with the upper and lower connecting rods (32) and the limiting locking link (33), the top crossbar (30) is raised. In the open state, the component of the gravity of the top crossbar (30) acting on the connection between the rotating rod (332) and the top connecting rod (333) in the direction of the vertical rotating rod (332) is directed away from the limiting connecting rod (331).

4. A pull-out sofa according to claim 3, characterized in that, A bed board (4) is provided on the top crossbar (30), and the bed board (4) is at the same height as the sofa.

5. A pull-out sofa according to claim 3, characterized in that, The upper and lower connecting rods (32) are hinged to the rightmost end of the top crossbar (30) and located in the middle of the side of the bed board (4).

6. A pull-out sofa according to claim 5, characterized in that, The bottom plate frame (31) is vertically fixed to a support plate (5) at the end away from the accommodating space (2). When the top crossbar (30) is in the open state, the bottom surface of the top crossbar (30) presses against the top surface of the support plate (5).

7. A pull-out sofa according to claim 5, characterized in that, The base plate frame (31) is vertically fixed to a support plate (5) at the end away from the accommodating space (2). A support platform (50) is fixed to the top of the support plate (5) on the side close to the accommodating space (2). The height of the support platform (50) and the top edge of the support plate (5) is equal to the thickness of the top crossbar (30). When the top is raised, the bottom surface of the top crossbar (30) presses on the support platform (50).

Images