Vehicle seat back folding device

Abstract

The present invention relates to a folding device for a vehicle seat back, comprising: a pad bracket; a rear frame that rotates on the pad bracket; a spring mounting bracket that is coupled to the rear frame and rotates integrally with the rear frame about a hinge joint; a return spring that applies an elastic restoring force to the rear frame in the direction of seat back folding; and a reverse spring that is supported in a state in which its first end is engaged with the spring mounting bracket and its second end is engaged with the first spring support end.

Description

Technical Field

[0001] This invention relates to a seat back folding device for a vehicle, and more specifically, to a seat back folding device for a vehicle that can improve the folding speed and unfolding force problems when folding the seat back. Background Technology

[0002] Vehicles are equipped with seats for passengers to sit in. Typical vehicle seats include a seat cushion that supports the lower body of the passenger and a seat back that supports the upper body.

[0003] In addition, the upper part of the seat back of the vehicle is equipped with a headrest to support the passenger's head and neck.

[0004] In addition, vehicle seats are equipped with armrests for resting the arms, cup holders for holding beverage containers such as cans, bottles, and cups, recliners for adjusting the fore-and-aft angle of the seat back, and position adjustment devices for adjusting the fore-and-aft position of the seat.

[0005] Furthermore, in vehicles such as SUVs or hatchbacks where there is no clear distinction between trunk space and interior space, the backrests of the second-row seats can be configured to fold forward, and the interior space in the rear seats can be expanded for use by folding down the backrests of the second-row seats.

[0006] As an example, when the second-row seats are configured as folding seats, the space above the folded seat backs can be used as cargo loading space behind the folded seat backs.

[0007] On the other hand, in known folding devices for folding seat backs, the back side frame (or upper arm bracket) of the seat back and the cushion bracket (or lower arm bracket) of the seat cushion are hinged together by a hinge axis.

[0008] As described above, the seat back can be folded forward from the seat cushion because the rear frame is hinged to the cushion support.

[0009] In addition, a hinge bracket is provided on the rear frame, and a return spring is installed around the hinge axis.

[0010] Therefore, when the user operates the lever to start the folding operation of the seat back, the elastic restoring force of the return spring acts on the rear frame through the hinge bracket, and finally, the seat back can automatically fold forward by the elastic restoring force of the return spring.

[0011] However, in the aforementioned prior art, when the seat back is folded forward, there is a problem that the seat back rotates forward rapidly due to its own weight, causing injury to the passenger.

[0012] In addition, when unfolding the seat back from its folded state, there is a problem that the force required to unfold it (unfolding force) is too large due to the tension of the return spring, making it difficult to unfold the seat back. Summary of the Invention

[0013] (a) Technical problems to be solved

[0014] Therefore, the present invention is proposed to solve the problems described above, and its object is to provide a vehicle seat back folding device that can improve the folding speed and unfolding force problems when folding the seat back.

[0015] (II) Technical Solution

[0016] To achieve the above objectives, according to an embodiment of the present invention, a vehicle seat back folding device is provided, comprising: a cushion bracket integrally connected to a seat cushion; a rear frame integrally connected to the seat back and hinged to the cushion bracket for rotation on the cushion bracket when the seat back is folded and unfolded; a spring mounting bracket connected to the rear frame and integrally rotating with the rear frame about a hinge joint between the cushion bracket and the rear frame; a return spring, wherein its first end is fixedly connected to the spring mounting bracket and its second end is engaged with a fixed support end integrally provided on the cushion bracket and supported, and applies an elastic restoring force to the rear frame in the seat back folding direction; and a reverse spring, wherein its first end is fixedly connected to the spring mounting bracket and its second end is supported in the unfolded state by engaging with a first spring support end integrally provided on the rear frame.

[0017] In a vehicle seat back folding device according to an embodiment of the present invention, when the rear frame and the seat back rotate together in the folding direction by a predetermined angle or more, the second end of the return spring may be in a state where it is engaged with and supported by a second spring support end integrally provided in the rear frame, and the reverse spring may be in a state where its second end is engaged with and supported by a limiting end integrally provided in the pad bracket, and an elastic restoring force that rotates in the seat back unfolding direction is applied to the rear frame.

[0018] In addition, in the implementation of the present invention, the reset spring and the reverse spring can be helical springs arranged around the hinge joint between the pad bracket and the rear frame, respectively. The first end of the reset spring and the reverse spring can be the inner end located on the inner side of the helical shape of the spring, and the second end of the reset spring and the reverse spring can be the outer end located on the outer side of the helical shape of the spring.

[0019] Furthermore, in an embodiment of the present invention, the reset spring and the reverse spring can be configured as an overlapping structure located on the sides of each other.

[0020] In addition, in the implementation of the present invention, a base support can be integrally provided on the pad support, and the fixed support end and the limiting end can be formed on the base support.

[0021] In addition, in the implementation of the present invention, a bracket portion having a shape protruding to the side can be integrally formed on the rear frame, and the first spring support end and the second spring support end can be formed on the bracket portion.

[0022] In addition, in the implementation of the present invention, the base support can be configured as a structure that protrudes to the side from the pad support, a fixed support end can be formed at one end of the base support, and the limiting end can be formed at the opposite end of the base support.

[0023] In addition, in the implementation of the present invention, a bracket portion having a shape protruding to the side can be integrally formed on the rear frame, a first spring support end can be formed at one end of the bracket portion, and a second spring support end can be formed at the opposite end of the bracket portion.

[0024] Furthermore, in an embodiment of the present invention, when the rear frame rotates, the movement trajectory of the support portion can be set to pass through the inner side of the base support provided on the pad support.

[0025] In addition, in the implementation of the present invention, the fixed support end can be formed into a groove shape on one side of the base bracket to insert the second end of the reset spring and engage with it, and the limiting end can be formed into a groove shape on the opposite side of the base bracket to insert the second end of the reverse spring and engage with it.

[0026] In addition, in the implementation of the present invention, the second end of the reset spring and the second end of the reverse spring may have an outwardly curved shape to insert into the groove-shaped fixed support end and the limiting end.

[0027] In addition, in the implementation of the present invention, the first spring support end can be formed into a groove shape at one side end of the bracket to insert and engage with the second end of the reverse spring, and the second spring support end can be formed into a groove shape at the opposite side end of the bracket to insert and engage with the second end of the reset spring.

[0028] In addition, in the implementation of the present invention, the second end of the reverse spring and the second end of the return spring may have an outwardly curved shape to insert into the groove-shaped first spring support end and the second spring support end.

[0029] (III) Beneficial Effects

[0030] Therefore, the seat back folding device of the vehicle according to the present invention can reduce the folding force and speed after the seat back is folded to a certain extent, thus solving the problem of seat back causing injury to passengers.

[0031] In addition, the elastic restoring force of the reverse spring assists in the unfolding of the seat back, thus reducing the force (unfolding force) required to unfold the seat back, ultimately improving ease of use. Attached Figure Description

[0032] Figure 1 This is a diagram showing the seat in its folded and unfolded states.

[0033] Figure 2 This is an assembled perspective view showing the structure of a seat back folding device according to an embodiment of the present invention.

[0034] Figure 3 This is an exploded perspective view showing the structure of a seat back folding device according to an embodiment of the present invention.

[0035] Figure 4 This is a perspective view showing the separation of the return spring from the seat back folding device according to an embodiment of the present invention.

[0036] Figure 5 This is a perspective view showing the separation of the return spring and the reverse spring in a seat back folding device according to an embodiment of the present invention.

[0037] Figures 6 to 8 This is a perspective view showing the operating state of a seat back folding device according to an embodiment of the present invention. Detailed Implementation

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the invention.

[0039] The illustrations of specific structures or functions provided in the embodiments of the invention are for illustrative purposes only and are intended to illustrate embodiments of the concept according to the invention, which can be implemented in various forms. Furthermore, they should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, or substitutions contained within the technical concept and scope of the invention.

[0040] Throughout this specification, the same reference numerals denote the same components. Furthermore, the terminology used in this specification is for describing embodiments and not for limiting the invention. In this specification, unless otherwise stated, singular forms include plural forms. Throughout this specification, when a part "comprises" a component, it means, unless expressly stated to the contrary, that other components may also be included, not excluded.

[0041] Figure 1 This diagram shows the seat in its folded and unfolded states. Additionally, Figure 2 This is an assembly perspective view showing the structure of a seat back folding device according to an embodiment of the present invention. Figure 3 This is an exploded perspective view showing the structure of a seat back folding device according to an embodiment of the present invention.

[0042] in addition, Figure 4 This is a perspective view showing the separation of the return spring from the seat back folding device according to an embodiment of the present invention. Figure 5 This is a perspective view showing the return spring and the reverse spring separated together in a seat back folding device according to an embodiment of the present invention.

[0043] Reference numeral 10 is set to be fixed in Figure 1 The component of the seat back 1 may be a back side frame (or upper arm bracket).

[0044] Reference numeral 20 is set to be fixed in Figure 1 The component of the seat cushion 2 may be a cushion bracket (or a lower arm bracket).

[0045] The aforementioned component is an assembly that folds and unfolds the seat back 1 to the seat cushion 2, and the rear frame 10 is rotatably hinged to the cushion bracket 20 via the hinge shaft 70.

[0046] Therefore, the seat back 1 can rotate on the seat cushion 2 around the hinge joint located at the lower end, and can move along... Figure 1 Fold or unfold in the direction of rotation shown.

[0047] In this invention, seat back folding means that the seat back 1 rotates forward toward the seat cushion with the lower end, which is the hinge joint with the seat cushion 2, as the center, so as to overlap the seat cushion.

[0048] The hinge joint is the part where the rear frame 10 and the pad bracket 20 are hinged together by the hinge shaft 70. It is the part that becomes the rotation center of the seat back 1 and the rear frame 10 located on the seat back 1 when the seat back is folded.

[0049] In addition, in this invention, unfolding the seat back means that the folded seat back 1 is rotated in the opposite direction to when it was folded, so that it is in a state where the user can lean back after sitting down.

[0050] From a structural perspective, the seat back folding device according to an embodiment of the present invention may include a rear frame 10, a pad bracket 20, a spring mounting bracket 30, a base bracket 40, a return spring 50, and a reverse spring 60.

[0051] As described above, the rear frame 10 is... Figure 1 The seat back 1 is an integral part, and the pad bracket 20 is for use with... Figure 1 The seat cushion is an integrally integrated component.

[0052] At this time, the spring mounting bracket 30 is integrated with the rear frame 10, and it is a rotating component that rotates together with the rear frame 10 when the seat back is folded and unfolded.

[0053] The base bracket 40 and the cushion bracket 20 are integrated into one unit and are fixed components that remain fixed to the side of the seat cushion 2 even when the seat back 1 is folded or unfolded.

[0054] In short, the spring mounting bracket 30 is a bracket that is set on the rear frame 10 and rotates together with the rear frame around the hinge axis 70 when the seat back 1 is folded, and the base bracket 40 is a bracket that is set on the pad bracket 20 and is always fixed and does not rotate.

[0055] The spring mounting bracket 30 is a bracket for fixing one end (the inner end of each spring) of the return spring 50 and the reverse spring 60. One side of the bracket has a first engagement portion 31 that engages with the first end 51 of the return spring 50, and the other side has a second engagement portion 32 that engages with the first end 61 of the reverse spring 60.

[0056] The base support 40 is configured to extend laterally from the pad support 20, with a fixed support end 41 on one side that can support the second end 52 of the reset spring 50 when engaged, and a limiting end 42 on the other side that can support the second end 62 of the reverse spring 60 when engaged.

[0057] The fixed support end 41 and the limiting end 42 can be formed on the opposite side ends of the base bracket 40, and can be formed in the shape of a groove on each side end of the base bracket 40 so that the second ends 52 and 62 of the springs 50 and 60 can be inserted into them and supported in a snap-fit ​​state.

[0058] In addition, a bracket portion 11 with a shape protruding to the side is integrally provided at the lower end of the rear frame 10. When the seat back is folded or unfolded, the bracket portion 11 will also move along the rotation trajectory during the rotation of the rear frame 10 around the hinge axis 70.

[0059] One side of the bracket portion 11 is formed with a first spring support end 13 that can support the second end 62 of the reverse spring 60 when it is engaged, and the other side of the bracket portion 11 is formed with a second spring support end 12 that can support the second end 52 of the reset spring 50 when it is engaged.

[0060] The first spring support end 13 and the second spring support end 12 can be formed on the opposite side ends of the bracket portion 11, and can be formed in the shape of a groove on each side end of the bracket portion 11 so that the second ends 52 and 62 of the springs 50 and 60 are respectively inserted therein and supported in a snap-fit ​​state.

[0061] Therefore, the rear frame 10 can be integrally provided with a first spring support end 13 and a second spring support end 12, and the pad bracket 20 can be integrally provided with a fixed support end 41 and a limiting end 42.

[0062] In an embodiment of the present invention, the support portion 11 formed on the rear frame 10 and the base support 40 integrally provided on the pad support 20 can be structures that protrude from the rear frame 10 and the pad support 20 to one side, i.e., both protrude in the same direction.

[0063] In this case, when the rear frame 10 rotates during the folding or unfolding of the seat back, the bracket portion 11 formed on the rear frame 10 should not collide or interfere with the base bracket 40 fixed to the pad bracket 20.

[0064] Therefore, when the rear frame 10 rotates, the movement trajectory of the support portion 11 is set to pass through the inner side of the base support 40 fixed to the pad support 20.

[0065] exist Figures 2 to 5 In the embodiment shown, the support portion 11 is configured to pass inside the base support 40 fixed to the pad support 20 when the rear frame 10 rotates.

[0066] In addition, both the return spring 50 and the reverse spring 60 can be spiral springs arranged around the hinge axis 70, which serves as the rotation center of the rear frame 10 and the seat back.

[0067] At this time, the return spring 50 and the reverse spring 60 can be configured as an overlapping structure with the hinge axis 70 as the center and the two springs 50 and 60 located on each other's sides.

[0068] Reference Figures 2 to 5 As can be seen, the reverse spring 60 is located on the inner side and the return spring 50 is located on the outer side. However, this is just an example. It is also possible to reverse this arrangement, with the return spring 50 located on the inner side and the reverse spring 60 located on the outer side.

[0069] As described above, the two springs 50 and 60 are positioned on the sides of each other. However, the positions of the two springs 50 and 60 may differ from the embodiment shown in the figure. The positions of the fixed support end 41 and the limiting end 42 on the base bracket 40, and the positions of the first spring support end 13 and the second spring support end 12 on the bracket portion 11 should be appropriately set or changed according to the positions of the two springs 50 and 60.

[0070] In addition, the return spring 50 is configured to apply an elastic restoring force in the folding direction of the seat back, and the reverse spring 60 is configured to apply an elastic restoring force in the unfolding direction opposite to the folding direction of the seat back.

[0071] Therefore, the return spring 50 and the reverse spring 60 can be helical springs wound in opposite directions to each other.

[0072] In the return spring 50, the first end 51 is engaged with and fixed to the first engagement portion 31 of the spring mounting bracket 30, and the second end 52 on the opposite side is supported in the initial setting state by being snapped into the fixed support end 41 of the base bracket 40.

[0073] The first end 51 of the return spring 50 is the inner end located on the inside of the spiral shape of the return spring, and the second end 52 is the outer end located on the outside.

[0074] In the reverse spring 60, the first end 61 is engaged with and fixed to the second engagement portion 32 of the spring mounting bracket 30, and the second end 62 on the opposite side is supported in the initial setting state by being snapped into the first spring support end 13 of the bracket portion 11.

[0075] The first end 61 of the reverse spring 60 is the inner end located on the inside of the spiral shape of the reverse spring, and the second end 62 is the outer end located on the outside.

[0076] In the return spring 50 and the reverse spring 60, the second ends 52 and 62, which are the outer ends, can have an outwardly curved shape so that they can be engaged in a state where they can be inserted into the support ends 12, 13, 41 or the limiting end 41 which are formed in the shape of a groove.

[0077] The operation of the seat back folding device according to an embodiment of the present invention will be described below.

[0078] Figures 6 to 8 This is a perspective view showing the operating state of a seat back folding device according to an embodiment of the present invention.

[0079] Figure 6 Shows the initial setup status. Figure 7 and Figure 8 This shows the sequential operation during the folding of the seat back.

[0080] In this invention, the first end 51 of the return spring 50 is coupled to the first coupling portion of the spring mounting bracket 30. Figure 3 and Figure 5 (Ref. 31 in the attached drawing), the first end 61 of the reverse spring 60 is coupled to the second coupling portion of the spring mounting bracket 30 ( Figure 3 and Figure 5 (see attached figure "32").

[0081] The first ends 51 and 61, which are the inner ends of the two springs 50 and 60, are always engaged with the corresponding joints 31 and 32 of the spring mounting bracket 30, regardless of the operating state of the seat back 1.

[0082] On the other hand, the second end 52 of the restoring spring 50 is engaged with the fixed support end of the base bracket 40. Figure 3 and Figure 5 Supported in the state indicated by reference numeral "41" in the attached figure (see Figure 41). Figure 6 ), and in the process of adjusting the seat back ( Figure 1 During the folding operation of the attached drawing (reference numeral "1"), when the seat back 1 is folded (i.e., rotated forward) above a predetermined angle, it moves and engages with the second spring support end of the bracket portion 11 integrally provided on the rear frame 10. Figure 3 and Figure 5 (Refer to the attached figure "12") Figure 8 ).

[0083] Additionally, the second end 62 of the reverse spring is engaged with the first spring support end of the bracket portion 11. Figure 3 and Figure 5 Supported in the state indicated by reference numeral "13" in the attached figure (see Figure 13). Figure 6 ), and during the folding operation of the seat back 1, when the seat back 1 is folded (i.e., rotated forward) above a predetermined angle, it moves and engages with the limiting end of the base bracket 40. Figure 3 and Figure 5 (Refer to the attached figure "42") Figure 8 ).

[0084] Figure 6 The initial setting shown is the state before the seat back 1 begins to fold, which is the state in which the user can sit down and lean their back against the seat back 1.

[0085] Referring to the accompanying drawings for further explanation, in the initial setting state, that is, before the seat back 1 is folded, the second end 52, which is the outer end of the return spring 50, is engaged with the fixed support end 41 of the base bracket 40.

[0086] At this time, the second end 62, which is the outer end of the reverse spring 60, is engaged with the first spring support end 13 of the bracket portion 11.

[0087] In addition, as described above, the first end 51 of the return spring 50 is engaged with the first engagement portion 31 of the spring mounting bracket 30, and the first end 61 of the reverse spring 60 is engaged with the second engagement portion 32 of the spring mounting bracket 30.

[0088] In this initial setup, the first end 51 of the return spring 50 is attached to the spring mounting bracket 30, which is a rotating component, and the second end 52 of the return spring 50 is attached to the base bracket 40, which is a fixing component. Therefore, the elastic restoring force of the return spring 50 is applied in the folding direction of the seat back 1.

[0089] Therefore, in such Figure 6 In the initial setting shown, when the seat back 1 begins to fold, the rear frame 10 and the spring mounting bracket 30 can rotate together by the elastic restoring force of the return spring 50, thereby realizing the automatic folding of the seat back 1.

[0090] In addition, in the initial setting state, the first end 61 of the reverse spring 60 is attached to the spring mounting bracket 30, which is a rotating component, and the second end 62 of the reverse spring 60 is attached to the bracket portion 11, which rotates in the same way as the spring mounting bracket 30. Therefore, during the period from the initial setting state to the state of the predetermined folding angle, which is the initial folding interval, even if the seat back 1 is folded, the reverse spring 60 will rotate together with the spring mounting bracket 30.

[0091] For reference, the bracket part 11 is integrally mounted on the rear frame 10, and the spring mounting bracket 30 is integrally fixedly mounted on the rear frame 10. Therefore, when the seat back 1 is folded and unfolded, the bracket part 11 and the spring mounting bracket 30 rotate together when the rear frame 10 rotates.

[0092] Therefore, during the initial folding range of the seat back 1, the reverse spring 60 does not deform, the force of the reverse spring 60 does not act on other components, and only the elastic restoring force of the return spring 50 acts as the force for folding the seat back 1.

[0093] Next, when the seat back 1 rotates to a predetermined angle, it will become as follows: Figure 7 As shown, during the folding of the seat back 1, when the seat back 1 reaches a predetermined angle as the rear frame 10 and spring mounting bracket 30 rotate, the second spring support end 12 of the bracket portion 11 will reach the fixed support end 41 position of the base bracket 40.

[0094] That is, such as Figure 7 As shown, the second spring support end 12 of the bracket part 11 passes through and intersects with the fixed support end 41 of the base bracket 40. At this time, the second end 52 of the reset spring 50, which is locked to the fixed support end 41 of the base bracket 40, will be locked to the second spring support end 12 of the bracket part 11.

[0095] Finally, when the seat back 1 is in Figure 7 When further folded in the current state, the rear frame 10 and the spring mounting bracket 30 rotate further, causing the second end 52 of the return spring 50 to... Figure 8 The second spring support end 12, which moves from the fixed support end 41 of the base bracket 40 to the bracket part 11, is supported.

[0096] Subsequently, during the folding of the seat back 1, the second end 52 of the return spring 50 will... Figure 8 It is supported as shown in the state of being snapped into the second spring support end 12 of the bracket portion 11.

[0097] As described above, with the second end 52 of the return spring 50 engaged with the second spring support end 12, the first end 51 and the second end 52 of the return spring 50 are both connected to the spring mounting bracket 30 and the bracket portion 11, which are rotating components. Therefore, when the seat back 1 is folded down, the return spring 50 will rotate together with the spring mounting bracket 30.

[0098] Therefore, even if the seat back 1 is folded, the return spring 50 will not deform, and the force of the return spring 50 will not act on other parts.

[0099] Next, when the seat back 1 and the rear frame 10 are rotated to a predetermined angle, the first spring support end 13 of the bracket portion 11 will reach the limiting end 42 position of the base bracket 40.

[0100] That is, the first spring support end 13 of the bracket part 11 passes through and intersects with the limiting end 42 of the base bracket 40. At this time, the second end 62 of the reverse spring 60, which is locked to the first spring support end 13 of the bracket part 11, will be locked to the limiting end 42 of the base bracket 40.

[0101] Finally, when the seat back 1 is in Figure 7 When further folded in the current state, the rear frame 10 and the spring mounting bracket 30 rotate further, and the second end 62 of the reverse spring 60 moves from the first spring support end 13 of the bracket portion 11 to the limiting end 42 of the base bracket 40.

[0102] Subsequently, during the folding of the seat back 1, the second end 62 of the reverse spring 60 will... Figure 8 It is supported in the state of being snapped into the limiting end 42 of the base bracket 40.

[0103] As described above, when the second end 62 of the reverse spring 60 is engaged with the limiting end 42 of the base bracket 40, the first end 61 of the reverse spring 60 is engaged with the spring mounting bracket 30, which is a rotating component, and the second end 62 of the reverse spring 60 is engaged with the base bracket 40, which is a fixing component. Therefore, the elastic restoring force of the reverse spring 60 will act on the spring mounting bracket 30.

[0104] Figure 8 Showing seat back 1 in Figure 7 In the state of further folding and the first spring support end 13 of the spring mounting bracket 30 has passed the limiting end 42 of the base bracket 40.

[0105] In this state, since the first end 51 and the second end 52 of the return spring 50 are connected to the spring mounting bracket 30 and the bracket portion 11, which are rotating components, the return spring 50 rotates together with the rear frame 10 and the spring mounting bracket 30 when the seat back 1 is folded. Therefore, the force of the return spring 50 does not act on other components.

[0106] On the other hand, in the case of the reverse spring 60, with the first end 61 engaged with the spring mounting bracket 30, the second end 62 is engaged with the limiting end 42 of the base bracket 40, so its elastic restoring force is applied in the unfolding direction opposite to the folding direction of the seat back 1.

[0107] As described above, starting from the point when the elastic restoring force of the reverse spring 60 is applied to the unfolding direction of the seat back 1, the seat back 1 can be folded by its own weight. However, since the elastic restoring force of the reverse spring 60 is applied in the opposite direction to the folding direction (opposite to its own weight), even if the seat back 1 is folded by its own weight, the folding speed may be reduced. Ultimately, the seat back 1 can be prevented from causing injury to the passenger.

[0108] Furthermore, when the seat back 1 is unfolded from the folded state, the seat back folding device according to the embodiment of the present invention operates in the reverse order of folding. In particular, in the initial unfolding interval where the seat back 1 begins to unfold, the elastic restoring force of the reverse spring 60 is applied in the unfolding direction of the seat back 1, thereby reducing the force (unfolding force) required for unfolding.

[0109] As described above, by means of the seat back folding device according to an embodiment of the present invention, the folding force and speed can be reduced after the seat back is folded to a predetermined degree, thus solving the problem of seat back causing injury to passengers.

[0110] In addition, the elastic restoring force of the reverse spring assists in the unfolding of the seat back, thus reducing the force (unfolding force) required to unfold the seat back, ultimately improving ease of use.

[0111] The embodiments of the present invention have been described in detail above. However, the scope of the present invention is not limited thereto. Various changes and modifications made by those skilled in the art using the basic concepts of the present invention as defined in the appended claims are also included within the scope of the present invention.

Claims

1. A vehicle seat back folding device, comprising: The support frame is integrated with the seat cushion. The rear frame is integrally integrated with the seat back and hinged to the cushion bracket to rotate on the cushion bracket when the seat back is folded and unfolded. A spring mounting bracket is combined with the rear frame and rotates integrally with the rear frame around the hinge joint between the pad bracket and the rear frame; The return spring, with its first end fixedly connected to the spring mounting bracket and its second end snapped into and supported by a fixed support end integrally provided on the pad bracket, applies an elastic restoring force to the rear frame in the direction of seat back folding. as well as The reverse spring is configured such that its first end is fixedly connected to the spring mounting bracket, and its second end is supported in the unfolded state of the seat back by being snapped into the first spring support end integrally provided on the rear frame. The reset spring and the reverse spring are respectively helical springs arranged around the hinge joint between the pad bracket and the rear frame. Wherein, the first ends of the return spring and the reverse spring are located on the inner side of the helical shape of the spring, and The second ends of the return spring and the reverse spring are located on the outer side of the spiral shape of the spring.

2. The vehicle seat back folding device according to claim 1, characterized in that, When the rear frame and the seat back are rotated together in the folding direction by a predetermined angle or more... The second end of the reset spring is in a state where it is snapped into and supported by the second spring support end integrally provided on the rear frame. The reverse spring is in a state where its second end is engaged with and supported by the limiting end integrally set on the pad bracket, and applies an elastic restoring force to the rear frame in the direction of seat back unfolding.

3. The vehicle seat back folding device according to claim 1, characterized in that, The return spring and the reverse spring are configured in an overlapping arrangement located on each other's sides.

4. The vehicle seat back folding device according to claim 2, characterized in that, A base support is integrally provided on the pad support, and the fixed support end and the limiting end are formed on the base support.

5. The vehicle seat back folding device according to claim 4, characterized in that, A bracket portion with a shape protruding to the side is integrally formed on the rear frame, and the bracket portion has a first spring support end and a second spring support end.

6. The vehicle seat back folding device according to claim 4, characterized in that, The base support is configured to protrude laterally from the pad support. A fixed support end is formed on one side of the base support. The limiting end is formed on the opposite end of the base support.

7. The vehicle seat back folding device according to claim 6, characterized in that, A support portion with a shape protruding to the side is integrally formed on the rear frame. The first spring support end is formed on one side of the bracket portion. A second spring support end is formed on the opposite end of the bracket portion.

8. The vehicle seat back folding device according to claim 7, characterized in that, When the rear frame rotates, the movement trajectory of the support portion is set to pass through the inner side of the base support set in the pad support.

9. The vehicle seat back folding device according to claim 7 or 8, characterized in that, The fixed support end is formed into a groove shape on one side of the base bracket, into which the second end of the return spring can be inserted and engaged. The limiting end is formed into a groove shape on the opposite side of the base support, into which the second end of the reverse spring can be inserted and engaged.

10. The vehicle seat back folding device according to claim 9, characterized in that, The second end of the reset spring and the second end of the reverse spring have outwardly curved shapes to insert into the groove-shaped fixed support end and the limiting end.

11. The vehicle seat back folding device according to claim 7 or 8, characterized in that, The first spring support end is formed into a groove shape on one side of the bracket, which can be inserted into and engaged with the second end of the reverse spring. The second spring support end is formed into a groove shape on the opposite side of the bracket, into which the second end of the reset spring can be inserted and engaged.

12. The vehicle seat back folding device according to claim 11, characterized in that, The second end of the reverse spring and the second end of the return spring have outwardly curved shapes to insert into the groove-shaped first spring support end and second spring support end.

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