Seat support and seat

Abstract

The application discloses a seat support, which comprises a seat cushion frame and a backrest frame, a backrest support frame, a seat cushion support frame and a long connecting rod, the long connecting rod is connected between the seat cushion frame and the backrest frame, the bottom end of the backrest frame is rotatably connected with the backrest support frame, and the front end of the seat cushion frame is rotatably connected with the seat cushion support frame; the seat support comprises a first state, a second state and a third state; in the first state, the seat cushion support frame is unfolded and the front end of the seat cushion frame is lifted upward, the rear end of the seat cushion frame is inclined downward relative to the front end, and the backrest frame is unfolded backward; in the second state, the backrest frame is turned forward, the backrest frame drives the seat cushion frame to move forward and downward through the long connecting rod, and the seat cushion support frame is folded; in the third state, the backrest frame is turned backward and opened, the backrest frame drives the seat cushion frame to be lifted upward through the long connecting rod, and drives the seat cushion support frame to be unfolded, and the front end of the seat cushion frame is lifted upward. The seat support can be folded forward and opened backward.

Description

Technical Field

[0001] This invention relates to the technical field of seating, and more particularly to a seat bracket and a seat. Background Technology

[0002] Currently, there are two ways to convert a chair into a bed:

[0003] 1. Fold the backrest forward so that the back of the backrest faces upward. This type of backrest has a relatively hard back, which is uncomfortable to lie on directly and requires a cushion.

[0004] 2. With the backrest opened backwards and the front facing upwards, the seat can be used as a bed. However, because the seat cushion needs to be tilted backwards at a certain angle in normal use, it remains tilted backwards even when the backrest is opened, making it impossible for the seat to be on the same horizontal plane as the backrest. This results in poor comfort when the seat is converted into a bed. Furthermore, the seat cannot be folded forwards to flatten it, making it inconvenient for loading luggage.

[0005] Therefore, it is necessary to design a seat frame and seat that can be folded forward and opened backward. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a seat bracket and seat that can be folded forward and opened backward.

[0007] The technical solution of the present invention provides a seat bracket, including a seat cushion frame and a backrest frame, and further including a backrest support frame, a seat cushion support frame and a long connecting rod. The long connecting rod is connected between the seat cushion frame and the backrest frame. The bottom end of the backrest frame is rotatably connected to the backrest support frame, and the front end of the seat cushion frame is rotatably connected to the seat cushion support frame.

[0008] The seat support includes a first state, a second state, and a third state:

[0009] In the first state, the seat cushion support frame is unfolded and the front end of the seat cushion frame is raised upward, the rear end of the seat cushion frame is tilted downward relative to the front end, and the backrest frame is tilted backward and unfolded.

[0010] In the second state, the backrest frame flips forward, and the backrest frame drives the seat cushion frame to move forward and downward through the long connecting rod, while the seat cushion support frame folds.

[0011] In the third state, the backrest frame flips back and opens, and the backrest frame drives the seat cushion frame to lift upward through the long connecting rod, while simultaneously driving the seat cushion support frame to unfold, and the front end of the seat cushion frame to rise upward.

[0012] Furthermore, a backrest folding assembly is provided at the backrest support bracket;

[0013] In the first state and the third state, the backrest folding assembly holds the backrest frame at any rearward angle;

[0014] When switching to the second state, the backrest folding assembly unlocks the backrest frame and causes the backrest frame to flip forward.

[0015] Furthermore, the backrest folding assembly includes a handle, a cable, a cable bracket, a first connecting rod, a cam, a pinion, a gear, and a coil spring. One end of the cable is connected to the handle, and the other end is connected to the free end of the cable bracket. The rotating end of the cable bracket is rotatably connected to the gear coaxially. One end of the first connecting rod is rotatably connected to the cable bracket, and the other end is fixedly connected to the cam. The cam is rotatably connected to the backrest support frame, and the cam contacts the pinion. The pinion is also rotatably connected to the backrest support frame. The gear is fixedly connected to the backrest frame and rotatably connected to the backrest support frame. One end of the coil spring is fixedly connected to the gear, and the other end is fixedly connected to the rotating end of the cable bracket.

[0016] In the first state and the third state, the handle is not engaged, the pinion gear meshes with the gear, the gear holds the backrest frame at any backward angle, and the coil spring is in an energy storage state.

[0017] When switching to the second state, the handle is engaged, which drives the cable, which in turn drives the free end of the cable bracket to rotate around the rotating end. The cable bracket drives the first connecting rod, which in turn drives the cam to rotate. After the cam drives the pinion to rotate, the pinion separates from the large gear. The coil spring drives the large gear to rotate, and the large gear drives the backrest frame to flip forward.

[0018] Furthermore, the cable support is provided with a groove, and one end of the first connecting rod is embedded in the groove.

[0019] Furthermore, the handle is mounted on the top of the backrest frame.

[0020] Furthermore, one end of the long connecting rod is rotatably connected to the backrest frame, and the other end of the long connecting rod is connected to the seat cushion frame via a snap-fit ​​assembly. The snap-fit ​​assembly includes a snap-fit ​​shaft and a snap-fit ​​seat. The snap-fit ​​shaft is connected to the long connecting rod, and the snap-fit ​​seat is connected to the seat cushion frame. The snap-fit ​​shaft switches between a first snap-fit ​​position and a second snap-fit ​​position of the snap-fit ​​seat.

[0021] In the first state and the second state, the card shaft switches to the first card position of the card seat, and the rear end of the seat frame is tilted downward relative to the front end;

[0022] In the third state, the card shaft switches to the second card position of the card seat, and the rear end of the seat cushion is lifted upward.

[0023] Furthermore, the latching assembly also includes an unlocking protrusion, a crank connecting rod, a tension spring, and a fastening spring. One end of the crank connecting rod is connected to the unlocking protrusion, and the other end is connected to the latching shaft. One end of the tension spring is connected to the seat frame, and the other end is connected to the latching shaft. The other end of the long connecting rod is rotatably connected to the seat frame. The fastening spring is installed at the point of rotation between the long connecting rod and the seat frame.

[0024] When switching from the first state to the third state, the backrest frame flips back and opens, the large gear mounted on the backrest frame contacts the unlocking protrusion, and drives the crank connecting rod to rotate. The crank connecting rod drives the locking shaft to separate from the locking seat, the tension spring is stretched, and the fastening spring lifts the rear end of the seat cushion frame upward under the action of the pre-tension force. The locking shaft corresponds to the second locking position of the locking seat.

[0025] When the large gear separates from the unlocking protrusion, the tension spring drives the locking shaft into the second locking position of the locking seat.

[0026] Furthermore, one end of the long connecting rod is rotatably connected to the backrest frame, and the other end of the long connecting rod is connected to the seat cushion frame via a snap-fit ​​assembly. The snap-fit ​​assembly includes a snap-fit ​​shaft and a snap-fit ​​seat. The snap-fit ​​shaft is connected to the long connecting rod, and the snap-fit ​​seat is connected to the seat cushion frame. The snap-fit ​​shaft switches between a first snap-fit ​​position and a second snap-fit ​​position of the snap-fit ​​seat.

[0027] The card shaft switches to the first card position of the card seat, and the rear end of the seat frame tilts downward relative to the front end;

[0028] The card shaft switches to the second card position of the card seat, and the rear end of the seat cushion frame is lifted upward.

[0029] Furthermore, the snap-fit ​​assembly also includes a handle, a tension spring, a fastening spring, and a crank connecting rod. One end of the crank connecting rod is connected to the handle, and the other end is connected to the snap-fit ​​shaft. One end of the tension spring is connected to the seat cushion frame, and the other end is connected to the snap-fit ​​shaft. The other end of the long connecting rod is rotatably connected to the seat cushion frame. The fastening spring is installed at the point of rotation between the long connecting rod and the seat cushion frame.

[0030] When switching from the first locking position to the second locking position, the handle drives the crank connecting rod, which in turn drives the locking shaft to separate from the first locking position. The tension spring is stretched, and the fastening spring lifts the rear end of the seat frame upward under the pre-tension force. The locking shaft corresponds to the second locking position of the locking seat. After releasing the handle, the tension spring drives the locking shaft into the second locking position of the locking seat.

[0031] The present invention also provides a seat, including a seat cushion and a backrest cushion, and further including a seat bracket as described in any of the above claims, wherein the seat cushion is sleeved outside the seat cushion bracket and the backrest cushion is sleeved outside the backrest bracket.

[0032] The above technical solution has the following beneficial effects:

[0033] In the second state, the seat cushion frame can flip forward and downward, reducing the space occupied by the folded seat; in the third state, the seat cushion frame and the backrest frame that flips back and opens are on the same horizontal plane or the same plane, achieving a comfortable convertible bed effect. Attached Figure Description

[0034] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0035] Figure 1 This is a perspective view of the seat bracket in the first state according to Embodiment 1 of the present invention;

[0036] Figure 2 This is a partial exploded view of the seat bracket in the first state in Embodiment 1 of the present invention;

[0037] Figure 3 This is an exploded view of the seat bracket in the first state according to Embodiment 1 of the present invention;

[0038] Figure 4 This is a perspective view of the seat bracket in the second state in Embodiment 1 of the present invention;

[0039] Figure 5 This is an exploded view of the seat bracket in the second state in Embodiment 1 of the present invention;

[0040] Figure 6 This is a perspective view of the seat bracket in the third state according to Embodiment 1 of the present invention;

[0041] Figure 7 This is a partially enlarged view of the seat bracket switching from the first state to the third state in Embodiment 1 of the present invention;

[0042] Figure 8 This is an exploded view of the seat bracket in the third state in Embodiment 1 of the present invention;

[0043] Figure 9 This is a partial enlarged view of the seat bracket in the first state in Embodiment 2 of the present invention;

[0044] Figure 10 This is a partial exploded view of the seat bracket in the first state in Embodiment 2 of the present invention;

[0045] Figure 11 This is a partial enlarged view of the seat bracket in the third state in Embodiment 2 of the present invention.

[0046] Reference table for attached figures:

[0047] 1. Seat cushion frame; 2. Backrest frame; 4. Seat cushion support frame; 5. Long connecting rod;

[0048] Backrest support 3: Protrusion 31;

[0049] Backrest folding assembly 6: handle 61, cable 62, cable bracket 63, first link 64, cam 65, pinion 66, gear 67, coil spring 68, fastening bracket 69, return spring 70, arc groove 671, actuating part 672;

[0050] Snap-fit ​​assembly 7: Snap-fit ​​shaft 71, Snap-fit ​​seat 72, Unlocking protrusion 73, Crank connecting rod 74, Tension spring 75, Fastening spring 76, Handle 77, First snap-fit ​​position 721, Second snap-fit ​​position 722. Detailed Implementation

[0051] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0052] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0053] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0054] Example 1:

[0055] In one embodiment of the present invention, as Figure 1-8As shown, the seat support includes a seat cushion frame 1 and a backrest frame 2, as well as a backrest support leg 3, a seat cushion support leg 4 and a long connecting rod 5. The long connecting rod 5 is connected between the seat cushion frame 1 and the backrest frame 2. The bottom end of the backrest frame 2 is rotatably connected to the backrest support leg 3, and the front end of the seat cushion frame 1 is rotatably connected to the seat cushion support leg 4.

[0056] The seat support includes three states: first state, second state, and third state.

[0057] In the first state, the seat cushion support 4 unfolds and the front end of the seat cushion frame 1 is raised upwards, while the backrest frame 2 tilts backwards and unfolds.

[0058] In the second state, the backrest frame 2 flips forward, and the backrest frame 2 drives the seat cushion frame 1 to move forward and downward through the long connecting rod 5, and the seat cushion support frame 4 folds.

[0059] In the third state, the backrest frame 2 flips back and opens, and the backrest frame 2 drives the seat cushion frame 1 to lift upward through the long connecting rod 5, while simultaneously driving the seat cushion support frame 4 to unfold, and the front end of the seat cushion frame 1 is raised upward.

[0060] Specifically, such as Figure 1 As shown, the seat cushion frame 1 is a frame structure. The front end of the seat cushion frame 1 is connected to two seat cushion support frames 4, and the rear end of the seat cushion frame 1 is connected to two long connecting rods 5.

[0061] The backrest frame 2 has a rectangular frame structure. The bottom end of the backrest frame 2 is rotatably connected to two backrest support legs 3. At the same time, the bottom end of the backrest frame 2 is also rotatably connected to the other end of the long connecting rod 5.

[0062] The backrest support bracket 3 is a fixed structure used for fixed connection with the vehicle floor or sliding rails. When the backrest bracket 2 rotates, the backrest support bracket 3 remains stationary.

[0063] One end of the seat cushion support 4 is connected to the seat cushion frame 1, and the other end is fixedly connected to the vehicle floor or a sliding rail. The seat cushion support 4 can be unfolded or folded. In the first and third states of the seat support, the seat cushion support 4 is unfolded, raising the front end of the seat cushion frame 1 upwards; in the second state of the seat support, the seat cushion support 4 is folded, lowering the front end of the seat cushion frame 1.

[0064] The long connecting rod 5 is an arc-shaped rod. One end of the long connecting rod 5 is connected to the seat cushion frame 1, and the other end is connected to the backrest frame 2.

[0065] like Figure 1 As shown, this is the first state of the seat support. The seat cushion support 4 is unfolded and the front end of the seat cushion frame 1 is raised. The backrest frame 2 is tilted backward and unfolded. The backrest frame 2 is roughly in the vertical direction and tilted backward.

[0066] like Figure 4As shown, this is the second state of the seat support. The backrest frame 2 flips forward, and the backrest frame 2 drives the seat cushion frame 1 to move forward and downward through the long connecting rod 5. The seat cushion frame 1 pushes the seat cushion support frame 4 to fold, so that the overall height of the seat cushion frame 1 is lowered, as close as possible to the floor inside the vehicle, thereby reducing the volume of the seat support.

[0067] like Figure 6 As shown, this is the third state of the seat support. The backrest frame 2 flips back and opens to a near-horizontal position. The backrest frame 2, via the long connecting rod 5, lifts the seat cushion frame 1 upward, simultaneously unfolding the seat cushion support frame 4 and raising the front end of the seat cushion frame 1. After opening backward, the backrest frame 2 and seat cushion frame 1 of the seat support are basically on the same horizontal plane or the same plane. This allows the seat to be switched to a bed function.

[0068] Furthermore, such as Figure 2-3 As shown, the backrest support bracket 3 is equipped with a backrest folding assembly 6;

[0069] In the first and third states, the backrest folding assembly 6 holds the backrest frame 2 at any rearward angle;

[0070] When switching to the second state, the backrest folding component 6 unlocks the backrest frame 2 and causes the backrest frame 2 to flip forward.

[0071] Specifically, the backrest folding assembly 6 is installed on the backrest support bracket 3 and connected to the backrest frame 2. The backrest folding assembly 6 can lock the backrest frame 2, so that the backrest frame 2 is held at any angle backward, which can be the first state of tilting backward or the third state of lying flat backward.

[0072] When it is necessary to switch the seat support to the second state, the backrest frame 2 is unlocked by operating the backrest folding assembly 6, causing the backrest frame 2 to flip forward and downward, thereby switching to the second state. Figure 4 The state.

[0073] Furthermore, such as Figure 1-3 As shown, the backrest folding assembly 6 includes a handle 61, a cable 62, a cable bracket 63, a first connecting rod 64, a cam 65, a pinion 66, a gear 67, and a coil spring 68. One end of the cable 62 is connected to the handle 61, and the other end is connected to the free end of the cable bracket 63. The rotating end of the cable bracket 63 is rotatably connected to the gear 67 on the same axis. One end of the first connecting rod 64 is rotatably connected to the cable bracket 63, and the other end is fixedly connected to the cam 65. The cam 65 is rotatably connected to the backrest support 3. The cam 65 contacts the pinion 66, and the pinion 66 is also rotatably connected to the backrest support 3. The gear 67 is fixedly connected to the backrest frame 2 and rotatably connected to the backrest support 3. One end of the coil spring 68 is fixedly connected to the gear 67, and the other end is fixedly connected to the rotating end of the cable bracket 63.

[0074] In the first and third states, the handle 61 is not pulled, the pinion 66 meshes with the gear 67, the gear 67 holds the backrest frame 2 at any backward angle, and the coil spring 68 is in the energy storage state.

[0075] When switching to the second state, the handle 61 is pulled, which drives the cable 62. The cable 62 drives the free end of the cable bracket 63 to rotate around the rotating end. The cable bracket 63 drives the first connecting rod 64, which drives the cam 65 to rotate. After the cam 65 drives the pinion 66 to rotate, the pinion 66 separates from the large gear 67. The coil spring 68 drives the large gear 67 to rotate, and the large gear 67 drives the backrest frame 2 to flip forward.

[0076] Specifically, such as Figure 1 As shown, the handle 61 is installed on the top of the backrest frame 2. The handle 61 is connected to one end of the cable 62. The cable 62 extends down along a vertical bar of the backrest frame 2 to the backrest support 3. The other end of the cable 62 is connected to the free end of the cable bracket 3.

[0077] like Figure 2-3 As shown, the rotating end of the cable support 63, the fastening bracket 69, and the large gear 67 are coaxially and rotatably connected to the backrest support 3. When the cable 62 pulls the cable support 63, the cable support 63 rotates around the central axis of the rotating end.

[0078] One end of the first link 64 is rotatably connected to the cable bracket 63, and the other end is fixedly connected to the cam 65. The other end of the first link 64 is coaxially connected to the fastening bracket 69 and the cam 65. The fastening bracket 69 is fixedly connected to the backrest support 3. The first link 64 and the cam 65 can rotate relative to the fastening bracket 69.

[0079] Both cam 65 and pinion 66 are rotatably mounted on the backrest support bracket 3, with cam 65 in contact with pinion 66. When pinion 66 meshes with gear 67, it keeps gear 67 stationary. Gear 67 is fixedly connected to backrest frame 2 and is rotatably mounted on backrest support bracket 3.

[0080] One end of the coil spring 68 is fixedly connected to the large gear 67, and the other end is fixedly connected to the rotating end of the cable bracket 63.

[0081] like Figure 3 As shown, in the first state, the cable support 63 is held in place by the return spring 70, and the cable 63 remains stationary. At this time, the cable 62 does not exert any force on the cable support 63. The stationary cable support 63 keeps the first connecting rod 64, the cam 65, and the pinion 66 stationary. The pinion 66 is now engaged with the large gear 67, thereby keeping the large gear 67 and the backrest frame 2 stationary.

[0082] like Figure 5As shown, when it is necessary to switch to the second state, the user manually pulls the lever 61, and the lever 61 drives the cable bracket 63 along the cable 62. Figure 5 The cable support 63 rotates counterclockwise. The first connecting rod 64 drives the cam 65 to rotate clockwise, which in turn drives the pinion 66 to rotate counterclockwise, disengaging the pinion 66 from the large gear 67. The large gear 67 then rotates counterclockwise under the action of the coil spring 68. Figure 5 Rotating clockwise causes the backrest frame 2 to rotate clockwise as well, that is, to rotate forward and downward.

[0083] After the handle 61 is released, the cable 62 no longer pulls the cable bracket 63. The cable bracket 63 returns to its initial position under the action of the return spring 70. The cable bracket 63 drives the first connecting rod 64 and the cam 65 back to their initial positions.

[0084] like Figure 8 As shown, when switching to the third state, the backrest frame 2 is flipped backward. The backrest frame 2 drives the large gear 67 to rotate counterclockwise. After rotating, the large gear 67 meshes with the small gear 66 again, and the small gear 66 contacts the cam 65, allowing the backrest frame 2 to be held at any angle when flipped backward. If the handle 61 is pulled at this time, the small gear 66 and the large gear 67 will disengage, allowing the large gear 67 to rotate to the maximum flip angle, and the backrest frame 2 can easily flip backward to the horizontal open position.

[0085] Better, such as Figure 3 As shown, the large gear 67 has an arc-shaped groove 671, and the backrest support 3 has a protrusion 31, which is inserted into the arc-shaped groove 671. When the large gear 67 rotates, the protrusion 31 slides in the arc-shaped groove 671.

[0086] like Figure 5 As shown, in the second state, when the backrest frame 2 is flipped forward to a horizontal position, the protrusion 31 slides to the rear end of the arc groove 671. The protrusion 31 is used to limit the further forward flipping of the backrest frame 2.

[0087] like Figure 8 As shown, in the third state, when the backrest frame 2 is flipped backward to a horizontal position, the protrusion 31 slides to the front end of the arc groove 671. The protrusion 31 is used to limit the backrest frame 2 from further flipping backward.

[0088] Furthermore, such as Figure 8 As shown, a groove 631 is provided on the cable support 63, and one end of the first connecting rod 64 is embedded in the groove 631. When the cable support 63 rotates, it can drive the first connecting rod 64 to rotate together. One end of the first connecting rod 64 rotates in the groove 631, and the groove 631 can prevent the first connecting rod 64 from getting stuck with the cable support 63 during rotation.

[0089] In this embodiment, the handle 61 is installed on the top of the backrest frame 2.

[0090] Alternatively, the handle 61 can also be installed on the side bar of the backrest frame 2 or on the side bar of the seat cushion frame 1.

[0091] Furthermore, such as Figure 6-7 As shown, one end of the long connecting rod 5 is rotatably connected to the backrest frame 2, and the other end of the long connecting rod 5 is connected to the seat cushion frame 1 through a snap-fit ​​assembly 7. The snap-fit ​​assembly 7 includes a snap-fit ​​shaft 71 and a snap-fit ​​seat 72. The snap-fit ​​shaft 71 is connected to the long connecting rod 5, and the snap-fit ​​seat 72 is connected to the seat cushion frame 1. The snap-fit ​​shaft 71 switches between the first snap-fit ​​position 721 and the second snap-fit ​​position 722 of the snap-fit ​​seat 72.

[0092] In the first and second states, the card shaft 71 switches to the first card position 721 of the card seat 72, and the rear end of the seat frame 1 tilts downward relative to the front end.

[0093] In the third state, the clasp 71 switches to the second clasp position 722 of the clasp seat 72, and the rear end of the seat frame 1 is lifted upward.

[0094] Specifically, such as Figure 7 As shown, there are two card holders 72, located at the left and right ends of the card holder 71 respectively. Each card holder 72 includes a first card slot 721 and a second card slot 722. The first card slot 721 is located above the second card slot 722, and the first card slot 721 is closer to the rear side of the seat frame than the second card slot 722. Therefore, when the card holder 71 is located in the first card slot 721, the rear end of the seat cushion frame 1 is lower; when the card holder 71 is located in the second card slot 722, the card holder 71 moves forward, raising the rear end of the seat cushion frame 1 upward.

[0095] In this embodiment, the backrest folding assembly 6 and the locking assembly 7 are linked. Therefore, when switching to the third state, the backrest folding assembly 6 can drive the locking shaft 71 from... Figure 7 The first card position 721 is moved to... Figure 8 In the second slot 722, the backrest frame 2 opens backward to a horizontal position, while the rear end of the seat cushion frame 1 rises upward to be on the same horizontal plane as the front end, so that both the backrest frame 2 and the seat cushion frame 1 unfold to the same horizontal plane, thus improving the comfort of the seat support after it is transformed into a bed.

[0096] Furthermore, such as Figure 7-8 As shown, the snap-fit ​​assembly 7 also includes an unlocking protrusion 73, a crank connecting rod 74, a tension spring 75, and a fastening spring 76. One end of the crank connecting rod 74 is connected to the unlocking protrusion 73, and the other end is connected to the snap-fit ​​shaft 71. One end of the tension spring 75 is connected to the seat cushion frame 1, and the other end is connected to the snap-fit ​​shaft 71. The other end of the long connecting rod 5 is rotatably connected to the seat cushion frame 1. The fastening spring 76 is installed at the rotatable part of the long connecting rod 5 and the seat cushion frame 1.

[0097] When switching from the first state to the third state, the backrest frame 2 flips back and opens. The large gear 67 installed on the backrest frame 2 contacts the unlocking protrusion 73 and drives the crank connecting rod 74 to rotate. The crank connecting rod 74 drives the locking shaft 71 to separate from the locking seat. The tension spring 75 is stretched. Under the action of the pre-tightening force, the fastening spring 76 lifts the rear end of the seat cushion frame 1 upward. The locking shaft 71 corresponds to the second locking position 722 of the locking seat 72.

[0098] When the large gear 67 separates from the unlocking protrusion 73, the tension spring 75 drives the locking shaft 71 into the second locking position 722 of the locking seat 72.

[0099] Specifically, such as Figure 7 As shown, the unlocking protrusion 73 is installed at one end of the crank connecting rod 74 and is a triangular protrusion. The corresponding large gear 67 has a prying part 672 protruding from the teeth. The crank connecting rod 74 includes two rods that are rotatably connected to each other, and the other end of the crank connecting rod 74 is rotatably connected to the retaining shaft 71.

[0100] like Figure 8 As shown, the unlocking protrusion 73 and the crank connecting rod 74 are both mounted on the long connecting rod, so the unlocking protrusion 73 and the crank connecting rod 74 also move together with the long connecting rod 5.

[0101] The card holder 72 is fixedly connected to the seat frame 1. One end of the tension spring 75 is fixedly connected to the card holder 72, and the other end is fixedly connected to the card shaft 71. The tension spring 75 pulls the card shaft 71 towards the card holder 72, so that the card shaft 71 can be inserted into the first card position 721 or the second card position 722.

[0102] The other end of the long connecting rod 5 is rotatably connected to the seat cushion frame 1, and a fastening spring 76 is installed at the rotatable point between the long connecting rod 5 and the seat cushion frame 1. When switching from the first state to the third state, the backrest frame 2 flips back and opens, and the backrest frame 2 drives the large gear 67 along... Figure 7 When the gear rotates counterclockwise, the actuating part 672 of the large gear 67 contacts the unlocking protrusion 73. The actuating part 672 drives the unlocking protrusion 73, which in turn drives the crank connecting rod 74 to rotate and fold. The crank connecting rod 74 causes the retaining shaft 71 to separate from the retaining seat 72, at which point the retaining shaft 71 disengages from the first retaining position 721. The tension spring 75 is stretched, and the fastening spring 76, under the action of pre-tension, lifts the rear end of the seat cushion frame 1 upward, causing the second retaining position 722 to lift upward to the position corresponding to the retaining shaft 71. As the backrest frame 2 continues to flip backward, the actuating part 672 of the large gear 67 separates from the unlocking protrusion 73, the crank connecting rod 74 returns to its original position, and the tension spring 75 drives the retaining shaft 71 into the second retaining position 722 of the retaining seat 72, thereby realizing the switching of the retaining shaft 71 from the first retaining position 721 to the second retaining position 722, raising the rear end of the seat cushion frame 1.

[0103] When it is necessary to switch from the third state to the first state, the backrest frame 2 is flipped forward, and the backrest frame 2 drives the large gear 67 along... Figure 8 Rotating clockwise, the actuating part 672 disengages from the unlocking protrusion 73 again. The actuating part 672 drives the unlocking protrusion 73, which in turn drives the crank connecting rod 74 to rotate and fold. The crank connecting rod 74 then causes the retaining shaft 71 to separate from the retaining seat 72. At this point, the user needs to push the seat cushion 1 downwards so that the first retaining position 721 of the retaining seat 72 aligns with the retaining shaft 71. As the backrest frame 2 continues to flip forward, the actuating part 672 of the large gear 67 separates from the unlocking protrusion 73, the crank connecting rod 74 resets, and the tension spring 75 drives the retaining shaft 71 into the first retaining position 721 of the retaining seat 72, thus switching the retaining shaft 71 from the second retaining position 722 to the first retaining position 721, lowering the rear end of the seat cushion 1.

[0104] By implementing this embodiment, the seat frame can be folded forward until the backrest frame 2 is in a horizontal position and the seat cushion frame 1 is lowered to a position close to the ground, thus reducing the space occupied by the seat frame. The seat frame can also be opened backward until both the backrest frame 2 and the seat cushion frame 1 are on the same horizontal plane, transforming it into a bed for the user to lie down in.

[0105] When switching from the first state to the second state, simply pull the lever 71 to flip the backrest frame 2 forward. After the backrest frame 2 flips forward, the long connecting rod 5 pushes the seat cushion frame 1 forward and downward to fold the seat cushion support frame 4.

[0106] The switch from the second state to the first state is simply to flip the backrest frame 2 backward, which in turn drives the seat cushion frame 1 to lift backward and upward via the long connecting rod 5, and the seat cushion frame 1 drives the seat cushion support frame 4 to unfold.

[0107] When switching from the first state to the third state, simply flip the backrest frame 2 backward to a horizontal position, and the rear end of the seat cushion frame 1 can be lifted upward through the linkage of the backrest folding component 6 and the snap-fit ​​component 7.

[0108] The operation method of this embodiment is simple and easy for users to operate. Users can switch between different states of the seat support with almost only one hand.

[0109] Example 2:

[0110] Unlike Embodiment 1, the snap-fit ​​assembly 7 and the backrest frame 2 are not linked through the backrest folding assembly 6. The snap-fit ​​assembly 7 can be operated independently to switch the snap-fit ​​shaft between the first snap-fit ​​position 721 and the second snap-fit ​​position 722.

[0111] Figure 9-11As shown, one end of the long connecting rod 5 is rotatably connected to the backrest frame 2, and the other end of the long connecting rod 5 is connected to the seat cushion frame 1 through a snap-fit ​​assembly 7. The snap-fit ​​assembly 7 includes a snap-fit ​​shaft 71 and a snap-fit ​​seat 72. The snap-fit ​​shaft 71 is connected to the long connecting rod 5, and the snap-fit ​​seat 72 is connected to the seat cushion frame 1. The snap-fit ​​shaft 71 switches between the first snap-fit ​​position 721 and the second snap-fit ​​position 722 of the snap-fit ​​seat 72.

[0112] The clasp 71 switches to the first clasp 721 of the clasp seat 72, and the rear end of the seat cushion 1 tilts downward relative to the front end;

[0113] The pivot 71 switches to the second slot 722 of the slot seat 72, and the rear end of the seat frame 1 is lifted upward.

[0114] Furthermore, such as Figure 9-11 As shown, the snap-fit ​​assembly 7 also includes a handle 77, a tension spring 75, a fastening spring 76, and a crank connecting rod 74. One end of the crank connecting rod 74 is connected to the handle 77, and the other end is connected to the snap shaft 71. One end of the tension spring 75 is connected to the seat cushion frame 1, and the other end is connected to the snap shaft 71. The other end of the long connecting rod 5 is rotatably connected to the seat cushion frame 1. The fastening spring 76 is installed at the point where the long connecting rod 5 and the seat cushion frame 1 rotate.

[0115] When switching from the first locking position to the second locking position, the handle 77 drives the crank connecting rod 74, which in turn causes the locking shaft 71 to separate from the first locking position 721 of the locking seat 72. The tension spring 75 is stretched, and the fastening spring 76 lifts the rear end of the seat frame 1 upward under the preload. The locking shaft 71 corresponds to the second locking position 722 of the locking seat 72. After releasing the handle 77, the tension spring 75 drives the locking shaft 71 into the second locking position 722 of the locking seat 72.

[0116] Specifically, the handle 77 is rotatably mounted on the seat frame 1, and the handle 77 is also connected to one end of the crank connecting rod 74, the other end of the crank connecting rod 74 being connected to the retaining shaft 71.

[0117] When switching from the first card slot to the second card slot, pull handle 77 along... Figure 10 The counterclockwise rotation of the lever 77 causes the crank connecting rod 74 to extend, disengaging the retaining shaft 71 from the first retaining position 721, and stretching the tension spring 75.

[0118] like Figure 11 As shown, under the preload, the fastening spring 76 lifts the rear end of the seat frame 1 upwards, and the card holder 72 also lifts upwards simultaneously, so that the second card position 722 corresponds to the card shaft 71. After releasing the handle 77, the tension spring 75 drives the card shaft 71 into the second card position 722 of the card holder 72, realizing the switch from the first card position 721 to the second card position 722.

[0119] When it is necessary to switch from the second card slot to the first card slot, pull the handle 77 again. Figure 10 The counterclockwise rotation of the lever 77 causes the crank connecting rod 74 to extend, disengaging the retaining pin 71 from the second retaining position 722, and stretching the tension spring 75.

[0120] At this time, the user manually presses down on the seat cushion 1, so that the first locking position 721 of the card holder 72 corresponds to the locking shaft 71. After releasing the handle 77, the tension spring 75 drives the locking shaft 71 into the first locking position 721 of the card holder 72, realizing the switch from the second locking position 722 to the first locking position 721.

[0121] Optionally, in order for the single-sided handle 77 to smoothly separate the locking shaft 71 from the first locking position 721, a cable can be added to the side without the handle, and the other side of the locking shaft 71 can be disengaged from the first locking position 721 by the cable.

[0122] In Embodiment 2, switching between the first and third states requires flipping the backrest frame 2 backward and rotating the handle 77. Operating the handle 77 also allows for switching of the locking positions, thereby raising and lowering the rear end of the seat cushion frame 1 to meet the different comfort requirements of converting into a bed or a chair.

[0123] Example 3:

[0124] In some embodiments of the present invention, the seat includes a seat cushion and a backrest, and also includes the seat bracket of any of the above embodiments, with the seat cushion sleeved outside the seat cushion frame 1 and the backrest sleeved outside the backrest frame 2.

[0125] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A seat support, comprising a seat cushion frame and a backrest frame, characterized in that, It also includes a backrest support bracket, a seat cushion support bracket, and a long connecting rod. The long connecting rod connects the seat cushion frame and the backrest frame. The bottom end of the backrest frame is rotatably connected to the backrest support bracket, with the connecting axis serving as the rotation center axis of the backrest frame. The front end of the seat cushion frame is rotatably connected to the seat cushion support bracket. The seat support includes a first state, a second state, and a third state: In the first state, the seat cushion support frame is unfolded and the front end of the seat cushion frame is raised upwards, while the backrest frame is tilted backwards and unfolded. In the second state, the backrest frame flips forward to a horizontal position, and the backrest frame drives the rear end of the seat cushion frame to move forward and downward through the long connecting rod. The seat cushion support frame is folded, the front end of the seat cushion frame moves forward and downward, and the entire seat cushion frame moves forward and downward. In the third state, the backrest frame flips back and opens to a horizontal position. The backrest frame drives the rear end of the seat cushion frame to lift upward through the long connecting rod, while simultaneously driving the seat cushion support frame to unfold. The front end of the seat cushion frame is raised upward, and the entire seat cushion frame is raised upward.

2. The seat bracket according to claim 1, characterized in that, The backrest support bracket is equipped with a backrest folding assembly; In the first state and the third state, the backrest folding assembly holds the backrest frame at any rearward angle; When switching to the second state, the backrest folding assembly unlocks the backrest frame and causes the backrest frame to flip forward.

3. The seat bracket according to claim 2, characterized in that, The backrest folding assembly includes a handle, a cable, a cable bracket, a first connecting rod, a cam, a pinion, a gear, and a coil spring. One end of the cable is connected to the handle, and the other end is connected to the free end of the cable bracket. The rotating end of the cable bracket is rotatably connected to the gear coaxially. One end of the first connecting rod is rotatably connected to the cable bracket, and the other end is fixedly connected to the cam. The cam is rotatably connected to the backrest support frame and contacts the pinion. The pinion is also rotatably connected to the backrest support frame. The gear is fixedly connected to the backrest frame and rotatably connected to the backrest support frame. One end of the coil spring is fixedly connected to the gear, and the other end is fixedly connected to the rotating end of the cable bracket.

4. The seat bracket according to claim 3, characterized in that, In the first state and the third state, the handle is not engaged, the pinion gear meshes with the gear, the gear holds the backrest frame at any backward angle, and the coil spring is in an energy storage state. When switching to the second state, the handle is engaged, which drives the cable, which in turn drives the free end of the cable bracket to rotate around the rotating end. The cable bracket drives the first connecting rod, which in turn drives the cam to rotate. After the cam drives the pinion to rotate, the pinion separates from the large gear. The coil spring drives the large gear to rotate, and the large gear drives the backrest frame to flip forward.

5. The seat bracket according to claim 3, characterized in that, The cable support has a groove, and one end of the first connecting rod is embedded in the groove.

6. The seat bracket according to claim 3, characterized in that, One end of the long connecting rod is rotatably connected to the backrest frame, and the other end of the long connecting rod is connected to the seat cushion frame through a snap-fit ​​assembly. The snap-fit ​​assembly includes a snap-fit ​​shaft and a snap-fit ​​seat. The snap-fit ​​shaft is connected to the long connecting rod, and the snap-fit ​​seat is connected to the seat cushion frame. The snap-fit ​​shaft switches between a first snap-fit ​​position and a second snap-fit ​​position of the snap-fit ​​seat. In the first state and the second state, the card shaft switches to the first card position of the card seat, and the rear end of the seat frame is tilted downward relative to the front end; In the third state, the card shaft switches to the second card position of the card seat, and the rear end of the seat cushion is lifted upward.

7. The seat bracket according to claim 6, characterized in that, The latching assembly also includes an unlocking protrusion, a crank connecting rod, a tension spring, and a fastening spring. One end of the crank connecting rod is connected to the unlocking protrusion, and the other end is connected to the latch shaft. One end of the tension spring is connected to the seat frame, and the other end is connected to the latch shaft. The other end of the long connecting rod is rotatably connected to the seat frame. The fastening spring is installed at the rotatable point between the long connecting rod and the seat frame. When switching from the first state to the third state, the backrest frame flips back and opens, the large gear mounted on the backrest frame contacts the unlocking protrusion, and drives the crank connecting rod to rotate. The crank connecting rod drives the locking shaft to separate from the locking seat, the tension spring is stretched, and the fastening spring lifts the rear end of the seat cushion frame upward under the action of the pre-tension force. The locking shaft corresponds to the second locking position of the locking seat. When the large gear separates from the unlocking protrusion, the tension spring drives the locking shaft into the second locking position of the locking seat.

8. The seat bracket according to claim 1, characterized in that, One end of the long connecting rod is rotatably connected to the backrest frame, and the other end of the long connecting rod is connected to the seat cushion frame through a snap-fit ​​assembly. The snap-fit ​​assembly includes a snap-fit ​​shaft and a snap-fit ​​seat. The snap-fit ​​shaft is connected to the long connecting rod, and the snap-fit ​​seat is connected to the seat cushion frame. The snap-fit ​​shaft switches between a first snap-fit ​​position and a second snap-fit ​​position of the snap-fit ​​seat. The card shaft switches to the first card position of the card seat, and the rear end of the seat frame tilts downward relative to the front end; The card shaft switches to the second card position of the card seat, and the rear end of the seat cushion frame is lifted upward.

9. The seat bracket according to claim 8, characterized in that, The snap-fit ​​assembly also includes a handle, a tension spring, a fastening spring, and a crank connecting rod. One end of the crank connecting rod is connected to the handle, and the other end is connected to the snap pin. One end of the tension spring is connected to the seat frame, and the other end is connected to the snap pin. The other end of the long connecting rod is rotatably connected to the seat frame. The fastening spring is installed at the rotatable part of the long connecting rod and the seat frame. When switching from the first locking position to the second locking position, the handle drives the crank connecting rod, which in turn drives the locking shaft to separate from the first locking position. The tension spring is stretched, and the fastening spring lifts the rear end of the seat frame upward under the pre-tension force. The locking shaft corresponds to the second locking position of the locking seat. After releasing the handle, the tension spring drives the locking shaft into the second locking position of the locking seat.

10. A chair, comprising a seat cushion and a back cushion, characterized in that, It also includes the seat bracket as described in any one of claims 1-9, wherein the seat cushion is fitted outside the seat cushion frame and the backrest is fitted outside the backrest frame.

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