Backrest linkage type manual broaching machine

Abstract

The utility model discloses a backrest linkage type manual broaching machine. The backrest linkage type manual broaching machine comprises a sofa seat, lower cushions are hinged to the two sides of the sofa seat through first hinges, upper cushions are hinged to the front sides of the lower cushions through second hinges, front supporting legs and rear supporting legs are hinged to the bottoms of the upper cushions and are in linkage through first connecting rods, first supporting rods are arranged between the lower cushions and the rear supporting legs, and the first supporting rods are connected with the lower cushions through second connecting rods. Second connecting rods are arranged on the two sides of the lower cushion, one ends of the second connecting rods are in pivot joint with the front side of the lower cushion, the other ends of the second connecting rods are in pivot joint with a backrest, and idler wheels are arranged on the two sides of the end, close to the lower cushion, of the backrest. And the other end is pivoted to the rear bottom of the sofa seat. The utility model solves the problem of inconvenience in operation in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing, and in particular to a backrest-linked manual pull-out bed. Background Technology

[0002] A Chinese utility model patent with publication number CN210055328U, entitled "A Sofa Bed with Linked Retractable Legs," describes a sofa bed with a sofa seat, a foldable backrest, a mattress hinged to the front of the seat, a seat cushion connected to the mattress via a first hinge, a first support leg hinged to the seat cushion via a second hinge, and a second support leg hinged to the seat cushion via a third hinge. However, when switching between sofa and bed modes, only the seat cushion and mattress are linked, while the backrest needs to be flipped separately, making the operation somewhat cumbersome. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a convenient backrest linkage manual pull bed.

[0004] To achieve the above objectives, the technical solution adopted by the backrest-linked manual tufting bed of this utility model is as follows:

[0005] A backrest-linked manual pull-out bed includes a sofa seat. Lower cushions are hinged to both sides of the sofa seat via first hinges. The rear of the lower cushion is hinged to the front of the sofa seat. An upper cushion is hinged to the front of the lower cushion via a second hinge. Front and rear support legs are hinged to the bottom of the upper cushion. The front and rear support legs are linked by a first connecting rod. A first support rod is provided between the lower cushion and the rear support leg. One end of the first support rod is pivotally connected to the rear support leg, and the other end is provided with a first sliding shaft. A first waist-shaped hole for sliding the first sliding shaft is opened at the bottom of the front side of the lower cushion. Second connecting rods are provided on both sides of the lower cushion. One end of the second connecting rod is pivotally connected to the front of the lower cushion, and the other end is pivotally connected to a backrest. Rollers are provided on both sides of the backrest adjacent to one end of the lower cushion. The sofa seat is provided with a guide rail to accommodate the rollers' forward and backward movement. A second support rod is provided in the middle of the backrest. One end of the second support rod is pivotally connected to the backrest, and the other end is pivotally connected to the bottom of the rear side of the sofa seat.

[0006] Preferably, the bottom of the upper seat cushion is provided with a first limiting pin for preventing the front support leg from rotating. When the first limiting pin abuts against the front support leg, the top of the front support leg tilts towards the inner side of the sofa seat, and the angle between it and the ground is α, where 80°≤α<90°.

[0007] Preferably, a third support rod is provided between the upper seat and the front support leg. One end of the third support rod is pivotally connected to the upper seat, and the other end is provided with a second sliding shaft. The front support leg has a second waist-shaped hole for sliding the second sliding shaft. When the bottom of the front support leg touches the ground, the top of the third support rod is inclined to the front end face of the upper seat, and the angle between it and the front support leg is β, where 170°≤β<180°.

[0008] Preferably, the lower seat cushion is provided with first limiting protrusions on both sides, and the first limiting protrusions abut against the second connecting rod to prevent the end of the lower seat cushion away from the first hinge from rotating downward.

[0009] Preferably, the backrest includes a backrest frame with a backrest padding, and backrest mounting brackets are connected to the bottom two sides of the backrest frame via quick-release plugs. One side of the backrest mounting bracket is pivotally connected to the second connecting rod, and the other side is pivotally connected to the second support rod. Rollers are pivotally connected to the outside of the backrest mounting bracket.

[0010] Preferably, the backrest mounting bracket is provided with a third limiting pin, which abuts against the second support rod to prevent the backrest from sinking.

[0011] Preferably, the first hinge includes a first bracket and a second bracket that are hinged to each other. The first bracket is fixedly connected to the lower seat cushion, and the second bracket is fixedly connected to the sofa seat. A second limiting pin is provided on the second bracket, and the first bracket has a first limiting surface and a second limiting surface that cooperate with the second limiting pin.

[0012] Preferably, the second hinge includes a third bracket and a fourth bracket that are hinged to each other. The third bracket is fixed to the lower seat cushion, and the fourth bracket is fixed to the upper seat cushion. A second limiting boss is provided on the side of the third bracket adjacent to the fourth bracket, and the fourth bracket has a third limiting surface and a fourth limiting surface that cooperate with the second limiting boss.

[0013] Preferably, a damper is provided between the third and fourth supports.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] 1. The upper seat cushion drives the lower seat cushion, which is hinged to it, to flip. While the lower seat cushion rotates around the first hinge axis, it drives the backrest through the second link, thereby realizing the linkage between the backrest and the upper and lower seat cushions. There is no need to flip the backrest separately, which improves the convenience of operation.

[0016] 2. The first limit pin restricts the rotation angle of the front support leg, and the front support leg forms a safe self-locking angle with the ground to ensure the stability of the upper seat. A third support rod is set between the upper seat and the front support leg to improve the support force of the front support leg on the upper seat.

[0017] 3. When seated, the first limiting boss abuts against the second link to prevent the lower seat cushion from rotating downwards at the end away from the first hinge, ensuring that the upper and lower seat cushions have sufficient support and preventing the side of the upper and lower seat cushions that is next to the backrest from collapsing when the user sits down.

[0018] 4. Backrest mounting brackets and backrest frames with backrest padding can be packaged separately to increase container capacity and reduce transportation costs; the backrest mounting brackets and backrest frames with backrest padding can be assembled into a backrest by quick-release plugs upon arrival at the destination, which is also convenient to operate.

[0019] 5. Install a damper on the second hinge to make the movement of the upper and lower seat cushions smoother, thereby reducing the impact on the hands during the flipping of the upper seat cushion and improving the user experience. Attached Figure Description

[0020] Figure 1 This is a side view of the sleeping posture of the manual pull-out bed with backrest linkage according to this utility model.

[0021] Figure 2 yes Figure 1 Enlarged view of point C.

[0022] Figure 3 This is a cross-sectional view of the sleeping posture of the manual pull-out bed with backrest linkage according to this utility model.

[0023] Figure 4 yes Figure 3 Enlarged view of point D.

[0024] Figure 5 yes Figure 3 Enlarged view of point E.

[0025] Figure 6 yes Figure 3 Enlarged view of point F.

[0026] Figure 7 This is a front view of the seated position of the backrest-linked manual pull-out bed of this utility model.

[0027] Figure 8 yes Figure 7 AA sectional view.

[0028] Figure 9 yes Figure 8 Enlarged view of point G.

[0029] Figure 10 yes Figure 7 BB cross-sectional view.

[0030] Figure 11 yes Figure 10 Enlarged view of point H.

[0031] Figure 12 This is a schematic diagram of the backrest structure.

[0032] Among them, 10 is the sofa seat, 101 is the guide rail, 20 is the first hinge, 201 is the first bracket, 2011 is the first limiting surface, 2012 is the second limiting surface, 202 is the second bracket, 2021 is the second limiting pin, 30 is the lower seat cushion, 301 is the first waist-shaped hole, 302 is the first limiting boss, 40 is the second hinge, 401 is the third bracket, 4011 is the second limiting boss, 402 is the fourth bracket, 4021 is the third limiting surface, 4022 is the fourth limiting surface, 403 is the damper, and 50 is the upper seat. Pad, 501 First limiting pin, 60 Front support leg, 601 Second waist-shaped hole, 70 Rear support leg, 80 First connecting rod, 90 Third support rod, 901 Second sliding shaft, 100 First support rod, 1001 First sliding shaft, 110 Second connecting rod, 120 Backrest, 1201 Backrest frame, 1202 Quick release plug, 12021 Male buckle, 12022 Female buckle, 1203 Backrest mounting bracket, 12031 Third limiting pin, 1204 Roller, 130 Second support rod. Detailed Implementation

[0033] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0034] like Figure 1-12As shown, a backrest-linked manual pull-out bed includes a sofa seat 10. A lower seat cushion 30 is hinged to both sides of the sofa seat via a first hinge 20. The first hinge includes a first support 201 and a second support 202 hinged together. The first support is fixed to the lower seat cushion, and the second support is fixed to the sofa seat. A second limiting pin 2021 is installed on the second support. The first support has a first limiting surface 2011 and a second limiting surface 2012 that cooperate with the second limiting pin. The rear side of the lower seat cushion is hinged to the front side of the sofa seat. The front side of the lower seat cushion is hinged to an upper seat cushion 50 via a second hinge 40. The second hinge includes a third support 401 and a fourth support 402 hinged together. The third support is fixed to the lower seat cushion, and the fourth support is fixed to the upper seat cushion. The side of the third support adjacent to the fourth support is integrally formed. The second limiting boss 4011 is provided. The fourth bracket has a third limiting surface 4021 and a fourth limiting surface 4022 that cooperate with the second limiting boss. A damper 403 is installed between the third and fourth brackets. The damper is a gas spring. The cylinder of the gas spring is hinged to the third bracket, and the telescopic rod of the gas spring is hinged to the fourth bracket. The gas spring provides resistance when the upper and lower seat cushions flip relative to each other, reducing the relative movement speed between the upper and lower seat cushions, thereby reducing the impact force on the hands during the flipping process of the upper seat cushion and improving the user experience. The bottom of the upper seat cushion is hinged to the front support leg 60 and the rear support leg 70. Both the front and rear support legs are U-shaped tubes. The top two sides of the front support leg are hinged to the bottom front side of the upper seat cushion, and the top two sides of the rear support leg are hinged to the bottom rear side of the upper seat cushion. The legs are linked by a first connecting rod 80. The front end of the first connecting rod is pivotally connected to the front support leg, and the rear end of the first connecting rod is pivotally connected to the rear support leg. The pivot axis between the first connecting rod and the front support leg is higher than the pivot axis between the front support leg and the upper seat cushion, and the pivot axis between the first connecting rod and the rear support leg is lower than the pivot axis between the rear support leg and the lower seat cushion. A first limiting pin 501 is installed at the bottom of the upper seat cushion to prevent the front support leg from rotating. When the first limiting pin abuts against the front support leg, the top of the front support leg tilts inward toward the sofa seat side, and the angle with the ground is α, where α = 87°. A third support rod 90 is installed between the upper seat cushion and the front support leg. The top end of the third support rod is pivotally connected to the upper seat cushion, and a second sliding shaft 901 is installed at the bottom end of the third support rod. The front support leg has a second oblong hole 601 for sliding the second sliding shaft. When the bottom of the front support leg touches the ground, the third support... The top of the rod is inclined to the front end of the upper seat cushion, and the angle between it and the front support leg is β, where β = 172°. A first support rod 100 is installed between the lower seat cushion and the rear support leg. The bottom end of the first support rod is pivotally connected to the rear support leg. A first sliding shaft 1001 is installed at the top of the first support rod. A first waist-shaped hole 301 for sliding the first sliding shaft is opened at the bottom of the front side of the lower seat cushion. Second connecting rods 110 are installed on both sides of the lower seat cushion. The front end of the second connecting rod is pivotally connected to the front side of the lower seat cushion, and the rear end of the second connecting rod is pivotally connected to the backrest 120. The backrest includes a backrest frame 1201 with a backrest padded backrest. The bottom two sides of the backrest frame are connected to the backrest mounting bracket 1203 through quick-release plugs 1202. The quick-release plugs include a male buckle 12021 and a female buckle 12022. The male buckle is installed on the back of the backrest frame.The female buckle is installed on the top surface of the backrest mounting frame. The backrest mounting frame and the backrest frame with backrest upholstery can be packaged separately to increase container capacity and reduce transportation costs. Upon arrival at the destination, the backrest mounting frame and the backrest frame with backrest upholstery are assembled into a backrest using quick-release inserts, making operation convenient. The front side of the backrest mounting frame is pivotally connected to a roller 1204. The sofa seat is equipped with a guide rail 101 to accommodate the roller's forward and backward movement. The front side of the backrest mounting frame is pivotally connected to a second connecting rod, and the rear side of the backrest mounting frame is pivotally connected to a second support rod 130. The front end of the second support rod is pivotally connected to the backrest mounting frame, and the rear end of the second support rod is pivotally connected to the bottom rear side of the sofa seat. A third limiting pin 12031 is installed on the rear side of the backrest mounting frame. The third limiting pin abuts against the second support rod to prevent the backrest from sinking. First limiting bosses 302 are provided on both sides of the lower seat cushion. The first limiting bosses abut against the second connecting rod to prevent the end of the lower seat cushion away from the first hinge from rotating downwards.

[0035] The specific working process and principle of this utility model:

[0036] When transitioning from a sitting to a sleeping position, pulling the upper seat cushion outward causes the lower seat cushion to rotate outward around the hinge axis of the first hinge. The second limiting pin disengages from the second limiting surface, and the first limiting boss disengages from the second connecting rod. The lower seat cushion then pulls the backrest via the second connecting rod, causing the lower side of the backrest to move forward along the guide rail via rollers. The top of the second support rod rotates downward with the backrest. As the upper seat cushion moves outward, the front and rear support legs automatically open under their own weight. The upper part of the front support leg abuts against the first limiting pin, forming a safe self-locking angle. Simultaneously, the second sliding shaft slides to the top of the second oblong hole, and the third support rod forms a safe locking mechanism with the front support leg. The self-locking angle enhances support for the upper seat cushion. At this point, the top surfaces of the upper and lower seat cushions and the backrest are flush, allowing the user to enter a sleeping position. In this position, the second limiting boss abuts against the third limiting surface, and the first sliding shaft slides to the front of the first waist-shaped hole, enabling the first support rod to support the front of the lower seat cushion. The rear of the lower seat cushion is supported by the first hinge, and the second limiting pin abuts against the first limiting surface, further improving the stability of the rear of the lower seat cushion and preventing it from sinking. The front of the backrest is supported by rollers, and the rear of the backrest is supported by the second support rod. The third limiting pin abuts against the second support rod, further improving the stability of the rear of the backrest and preventing it from sinking.

[0037] When transitioning from a sleeping to a sitting position, lift the upper seat cushion and move it towards one side of the sofa seat. Due to the action of the second limiting boss, the upper seat cushion cannot flip upwards around the hinge axis of the second hinge. Manually drive the bottom of the front support leg to rotate towards one side of the sofa seat, while the top of the front support leg rotates in the opposite direction. This pulls the rear support leg via the first connecting rod, allowing both the front and rear support legs to retract simultaneously. The first sliding axis slides behind the first oblong hole, and the second sliding axis slides below the second oblong hole. The lower seat cushion flips inwards around the hinge axis of the first hinge, disengaging the second limiting pin from the first limiting surface. The lower seat cushion is then pushed by the second connecting rod. The backrest moves, and the rollers move along the guide rail to the rear of the sofa seat. The top of the second support rod flips upward, the backrest returns to its original position to make room, and the lower seat cushion flips over and hides under the upper seat cushion, entering the sitting position. In the sitting position, the front side of the lower seat cushion is suspended from the sofa seat by the first hinge. The second limiting pin abuts against the second limiting surface, which improves the stability of the front side of the lower seat cushion. The first limiting bosses on both sides of the lower seat cushion press against the second connecting rod to ensure the stability of the rear side of the lower seat cushion. The second limiting boss abuts against the fourth limiting surface to restrict the downward movement of the upper seat cushion and ensure the stability of the upper seat cushion.

[0038] This invention enables the upper seat cushion to rotate, which in turn rotates the lower seat cushion that is hinged to it. As the lower seat cushion rotates around the first hinge axis, it drives the backrest through the second connecting rod, thereby achieving linkage between the backrest and the upper and lower seat cushions. This eliminates the need to rotate the backrest separately and improves the ease of operation.

Claims

1. A backrest-linked manual pull-out bed, comprising a sofa seat, with lower cushions hinged to both sides of the sofa seat via first hinges, the rear side of the lower cushions hinged to the front side of the sofa seat, and an upper cushion hinged to the front side of the lower cushions via a second hinge, the bottom of the upper cushions being hinged to a front support leg and a rear support leg, characterized in that: The front and rear support legs are linked by a first connecting rod. A first support rod is provided between the lower seat cushion and the rear support leg. One end of the first support rod is pivotally connected to the rear support leg, and the other end is provided with a first sliding shaft. A first waist-shaped hole for sliding the first sliding shaft is opened at the bottom of the front side of the lower seat cushion. A second connecting rod is provided on both sides of the lower seat cushion. One end of the second connecting rod is pivotally connected to the front side of the lower seat cushion, and the other end is pivotally connected to the backrest. Rollers are provided on both sides of the backrest adjacent to one end of the lower seat cushion. The sofa seat is provided with a guide rail to accommodate the back and forth rolling of the rollers. A second support rod is provided in the middle of the backrest. One end of the second support rod is pivotally connected to the backrest, and the other end is pivotally connected to the bottom of the rear side of the sofa seat.

2. The backrest-linked manual pull-out bed according to claim 1, characterized in that: The bottom of the upper seat cushion is provided with a first limiting pin to prevent the front support leg from rotating. When the first limiting pin abuts the front support leg, the top of the front support leg tilts towards the side of the inner sofa seat, and the angle between it and the ground is α, where 80°≤α<90°.

3. The backrest-linked manual pull-out bed according to claim 2, characterized in that: A third support rod is provided between the upper seat and the front support leg. One end of the third support rod is pivotally connected to the upper seat, and the other end is provided with a second sliding shaft. The front support leg has a second waist-shaped hole for sliding the second sliding shaft. When the bottom of the front support leg touches the ground, the top of the third support rod is tilted to the front end face of the upper seat, and the angle between it and the front support leg is β, where 170°≤β<180°.

4. The backrest-linked manual pull-out bed according to claim 1, characterized in that: The lower seat cushion is provided with first limiting protrusions on both sides. The first limiting protrusions abut against the second connecting rod to prevent the end of the lower seat cushion away from the first hinge from rotating downward.

5. The backrest-linked manual pull-out bed according to claim 1, characterized in that: The backrest includes a backrest frame with a backrest padding. The bottom two sides of the backrest frame are connected to backrest mounting brackets via quick-release plugs. One side of the backrest mounting bracket is pivotally connected to the second connecting rod, and the other side is pivotally connected to the second support rod. Rollers are pivotally connected to the outside of the backrest mounting bracket.

6. The backrest-linked manual pull-out bed according to claim 5, characterized in that: The backrest mounting bracket is equipped with a third limiting pin, which abuts against the second support rod to prevent the backrest from sinking.

7. The backrest-linked manual pull-out bed according to claim 1, characterized in that: The first hinge includes a first bracket and a second bracket that are hinged to each other. The first bracket is fixedly connected to the lower seat cushion, and the second bracket is fixedly connected to the sofa seat. A second limiting pin is provided on the second bracket, and the first bracket has a first limiting surface and a second limiting surface that cooperate with the second limiting pin.

8. The backrest-linked manual pull-out bed according to claim 1, characterized in that: The second hinge includes a third bracket and a fourth bracket that are hinged to each other. The third bracket is fixed to the lower seat cushion, and the fourth bracket is fixed to the upper seat cushion. A second limiting boss is provided on the side of the third bracket adjacent to the fourth bracket. The fourth bracket has a third limiting surface and a fourth limiting surface that cooperate with the second limiting boss.

9. The backrest-linked manual pull-out bed according to claim 8, characterized in that: A damper is provided between the third and fourth supports.

Images