Locking mechanism for seat extension plate

Abstract

The invention relates to a locking mechanism for a seat extension plate, the locking mechanism is used for detachably mounting the seat extension plate on a seat backrest, and the locking mechanism comprises a clamping plate, a shell, a bracket, a locking rod, a spring and a pin shaft; the clamping plate is mounted on the seat extension plate, and an opening is formed in the clamping plate; the bracket is mounted on a seat backrest; the shell is installed on the support, and a groove is formed in the shell; the locking rod comprises a handle part and a rod part, the rod part penetrates through the hole of the clamping plate and the groove of the shell and extends out of the bottom face of the groove, and a pin hole is formed in the end of the rod part. The pin shaft is inserted into a pin hole in the end part of the rod part; the spring is arranged between the outer side surface of the groove and the pin shaft; when the seat extension plate needs to be unfolded, the locking rod rotates and penetrates through the opening of the clamping plate to enter the groove of the shell, so that the seat extension plate can cross the locking rod to be opened; when the seat extension plate needs to be folded, the seat extension plate is close to the seat backrest, and the locking rod is pulled out and rotated, so that the handle part of the locking rod is clamped at the edge of the opening of the clamping plate.

Description

Technical Field

[0001] This invention relates to a locking mechanism, and more particularly to a locking mechanism for a seat extension plate. Background Technology

[0002] Currently, consumers have increasingly higher demands for expandable rear seat space, as more and more young people enjoy road trips and camping. They want the rear seats of their cars to be able to fold down completely and expand into a bed for rest. Luggage storage space can be used as a bedroom or resting area where passengers can lie down. This space is typically about 1.5 meters (m) long, but it's too narrow for passengers to fully lie down and stretch out.

[0003] Therefore, solutions have been explored that utilize the folding backrests of the rear seats as an extension of the luggage loading space. However, when expanding the luggage loading space by folding the backrests forward, there is an issue of uneven floor surfaces in the extended luggage loading space. Furthermore, because the rear seat backrests are approximately 0.67 meters long, even when the luggage loading space is expanded, it cannot be fully expanded due to the need for headrest space, etc.

[0004] Therefore, most vehicles have a problem when the rear seats are fully folded down: the seats can be laid completely flat, but there is a large gap between the seat back and the luggage compartment, which affects the passenger's experience of the seating space. Of course, this gap can be eliminated by installing a seat extension panel between the seat back and the luggage compartment, but the deployment and folding of the seat extension panel becomes a problem. It needs to cover the gap between the seat back and the luggage compartment when extended, and not affect the function of the seating and luggage loading space when folded down.

[0005] Therefore, the existing technology has the following problem: how to quickly retract or extend the seat extension panel of a vehicle without interfering with other components.

[0006] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] To address the problems existing in the prior art, the present invention provides a locking mechanism for a seat extension plate, which is used to quickly lock and release the seat extension plate without interfering with other components.

[0008] To address the aforementioned technical problems, the present invention provides a locking mechanism for a seat extension panel, which is used to detachably install the seat extension panel to a seat back. The locking mechanism for the seat extension panel includes a retaining plate, a housing, a bracket, a locking rod, a spring, and a pin. The retaining plate is mounted on the seat extension panel and has an opening. The bracket is mounted on the seat back. The housing is mounted on the bracket and has a groove. The locking rod includes a handle and a rod portion. The rod portion passes through the opening in the retaining plate and the groove in the housing and extends from the bottom surface of the groove. The end of the rod portion has a pin hole. The pin is inserted into the pin hole at the end of the rod portion. The spring is arranged between the outer side of the groove and the pin. When the seat extension panel needs to be unfolded, the locking rod rotates and passes through the opening in the retaining plate into the groove in the housing, allowing the seat extension panel to open by passing over the locking rod. When the seat extension panel needs to be retracted, the seat extension panel is pressed against the seat back, pulled outwards, and the locking rod is rotated, causing the handle of the locking rod to engage with the edge of the opening in the retaining plate.

[0009] Preferably, the opening of the card plate is a cross-shaped hole, which includes a first-direction opening and a second-direction opening, wherein the length of the first-direction opening is greater than or equal to the length of the handle, and the length of the second-direction opening is less than the length of the handle; the groove of the housing is a cross-shaped groove, which includes a first-direction groove and a second-direction groove, wherein the length of the first-direction groove is greater than or equal to the length of the handle, and the length of the second-direction groove is less than the length of the handle.

[0010] Preferably, the first direction is a horizontal direction and the second direction is a vertical direction.

[0011] Preferably, the locking mechanism for the seat extension plate further includes a buffer member arranged inside the bottom surface of the housing groove; the handle is formed with a buffer post corresponding to the buffer member.

[0012] Preferably, one of the bracket and the housing has a clip, and the other of the bracket and the housing has a slot, the clip and the slot cooperating to mount the housing onto the bracket.

[0013] Preferably, the pin has a retaining ring groove, and the retaining ring is engaged in the retaining ring groove.

[0014] Preferably, the retaining ring groove is located in the middle of the pin, the end of the locking rod has a hole, and a slot is formed in the hole, and the retaining ring is inserted into the retaining ring groove of the pin along the slot.

[0015] Preferably, a guide block is formed at the end of the rod, and the guide block is located inside the pin; a guide hole is formed on the bottom surface of the groove, and a guide surface is formed on the outer surface of the guide hole; the guide block engages with the guide surface under the action of the spring.

[0016] Preferably, the guide surface includes a first section, a transition section, a second section, and a stop portion, wherein the first section, the second section, and the stop portion extend from the bottom surface of the groove by an increasing distance in sequence, and the transition section is the inclined portion between the first section and the second section.

[0017] Preferably, the rod portion has an engaging block that engages with the guide hole; the engaging block is located closer to the handle portion than the guide block on the rod portion. Preferably, the locking mechanism for the seat extension plate further includes a washer disposed between the spring and the pin.

[0018] Preferably, a gripping portion is formed on the side of the handle, and the gripping portion has protrusions. The locking mechanism for a seat extension plate according to an embodiment of the present invention has the following beneficial effects:

[0019] When the seat back is fully folded down and formed into a bed with the luggage board, the seat extension panel of the present invention can be removed from the seat back and unfolded between the seat back and the luggage board to eliminate the gap between the seat back and the luggage board.

[0020] The locking mechanism of this invention will not protrude from the surface of the seat back after the seat extension plate is unfolded, thus preventing any protruding objects from interfering with the consumer's ability to lie down and rest after the seat back is reclined. Furthermore, the locking mechanism of this invention is simple in structure, easy to operate, and inexpensive. Attached Figure Description

[0021] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. For clarity, the same components in different drawings are shown with the same reference numerals. It should be noted that the drawings are for illustrative purposes only and are not necessarily drawn to scale. In these drawings:

[0022] Figure 1 This is an exploded view of a locking mechanism for a seat extension plate according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of a locking mechanism for a seat extension plate according to an embodiment of the present invention.

[0024] Figure 3 This is a perspective view of a locking rod of a locking mechanism for a seat extension plate according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of a locking mechanism for a seat extension plate according to an embodiment of the present invention, in which the retaining spring is located inside the locking rod.

[0026] Figure 5This is a partial schematic diagram of a locking mechanism for a seat extension plate according to an embodiment of the present invention, viewed from the rear.

[0027] Figure 6 This is a cross-sectional schematic diagram of the locking rod and housing of the locking mechanism for the seat extension plate according to an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the locking rod and housing of a locking mechanism for a seat extension plate according to an embodiment of the present invention, viewed from the rear, without showing components such as pins and snap rings.

[0029] Figure 8 This is a schematic diagram showing the guide block and guide surface of a locking mechanism for a seat extension plate according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram showing the handle position when the handle is folded up.

[0031] Figure 10 This is a schematic diagram showing the position of the handle in the unfolded state.

[0032] Figure 11 This is a schematic diagram of a modified embodiment of the locking mechanism for a seat extension plate according to an embodiment of the present invention.

[0033] Figure 12 This is a schematic diagram of a locking mechanism for a seat extension plate according to an embodiment of the present invention in the retracted state of the seat extension plate.

[0034] Figure 13 This is a schematic diagram of a locking mechanism for a seat extension plate according to an embodiment of the present invention in the unfolded state of the seat extension plate.

[0035] Figure 14 This is a schematic diagram of a locking mechanism for a seat extension plate according to another embodiment of the present invention in the unfolded state of the seat extension plate.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1: Locking lever 11: Handle

[0038] 12: Rod section 13: Pin hole

[0039] 14: Guide block 14a: Arc-shaped surface

[0040] 15: Connecting block 15a: Protrusion

[0041] 16: Slot 17: Buffer Post

[0042] 18: Grip section

[0043] 2: Cardboard 21: Plate Hole

[0044] 3: Shell 31: Groove

[0045] 31a: Bottom surface; 32: Mounting part

[0046] 33: Buffer hole; 34: Guide hole

[0047] 35: Guide surface 35a: First section

[0048] 35b: Transition section; 35c: Second section

[0049] 35d: Stop section; 36: Notch

[0050] 37: Card slot; 38: Base plate

[0051] 4: Bracket 41: Mounting hole

[0052] 42: Border 43: Clip

[0053] 5: Buffer component; 6: Spring

[0054] 7: Pin 71: Snap ring groove

[0055] 8: Snap ring 9: Washer

[0056] 10: Magnet

[0057] A: Seat extension panel B: Seat backrest

[0058] Unless otherwise stated, the same reference numerals or symbols indicate the same elements in the accompanying drawings.

[0059] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather present simplified representations of various features to illustrate the principles of the invention. Specific design features disclosed in this invention (including, for example, specific dimensions, orientations, positions, and shapes) will be determined in part by the specific environment in which they will be applied and used.

[0060] Throughout these figures, the same reference numerals denote the same or equivalent parts of the invention. Detailed Implementation

[0061] Reference will now be made in detail to various embodiments of the invention, examples of which are presented in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to these exemplary embodiments. Rather, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit of the invention and the scope defined by the appended claims.

[0062] According to an embodiment of the present invention, the locking mechanism for the seat extension plate is used to detachably install the seat extension plate onto the seat back, wherein in the retracted state where the seat extension plate is locked onto the seat back, the seat extension plate is securely locked onto the seat back; and in the unfolded state where the seat extension plate is released from the seat back, the seat extension plate can be released so that it can be unfolded.

[0063] The following reference Figures 1-13 A locking mechanism for a seat extension plate according to an embodiment of the present invention will be described in detail.

[0064] See Figures 1-2 The locking mechanism for seat extension plate A in the embodiment of the present invention includes a locking rod 1, a locking plate 2, a housing 3, a bracket 4, a spring 6, and a pin 7.

[0065] Figure 3 This is a schematic diagram of a locking rod in a locking mechanism for a seat extension plate according to an embodiment of the present invention. See also Figure 3 The locking lever 1 is generally a T-shaped structure, which includes a handle 11 and a rod 12 perpendicular to the handle 11.

[0066] The handle 11 is used by the user to grip and rotate the locking lever 1 during operation and to press the seat extension plate against the seat back when folded up. The bottom surface of the handle 11 has two outwardly extending buffer posts 17, which cooperate with the buffer member 5 located on the housing 3 to reduce the impact force between the lever 12 and the housing 3. In this embodiment, there are two buffer posts 17 and two buffer members 5.

[0067] The handle 11 has grip portions 18 on both sides, and the grip portions 18 have granular protrusions to increase friction.

[0068] The rod portion 12 has a pin hole 13 formed at the end away from the handle portion 11.

[0069] In one example, the end of the rod 12 has a hole extending along the axis, and slots 16 are formed on both sides of the hole for mounting the retaining ring 8. See [reference needed]. Figure 4 .

[0070] See Figure 1 The retaining plate 2 is a plate-shaped structure that is fixedly mounted on the seat extension plate A. For example, the retaining plate 2 is connected to the seat extension plate A by pins to ensure that the seat extension plate A has a good appearance when unfolded.

[0071] The locking plate 2 has a central hole 21. In this embodiment, the hole 21 is a cross-shaped opening. The length of the opening in one direction (first direction) of the cross-shaped opening is greater than or equal to the length of the handle 11 of the locking rod 1, so that the locking rod 1 can pass through the opening in the first direction; the length of the opening in the other direction (second direction) of the cross-shaped opening is less than the length of the handle 11 of the locking rod 1, so that the handle 11 of the locking rod 1 can be locked in the opening in that direction. In this embodiment, the length of the cross-shaped opening in the horizontal direction is greater than the length of the handle 11 of the locking rod 1, while the length of the cross-shaped opening in the vertical direction is less than the length of the handle 11 of the locking rod 1. That is, the first direction is the horizontal direction, and the second direction is the vertical direction. When the handle 11 of the locking rod 1 rotates to the first direction, the handle 11 can pass through or through the opening in the first direction of the locking plate 2, so that the locking plate 2 can be unfolded without restriction. When the handle 11 of the locking lever 1 is rotated to the second direction, the handle 11 can be locked at the edge of the opening in the second direction of the clamping plate 2.

[0072] The purpose of setting the opening of the card plate 2 in a cross shape is to allow the operator's fingers to penetrate into the groove 31 of the housing 3, thereby facilitating the operator's operation. Alternatively, the opening of the card plate 2 can also be other shapes, such as oval, rectangular, or oblong.

[0073] The bracket 4 has a mounting hole 41 and a frame 42 formed in the middle. The frame 42 surrounds the mounting hole 41 and is used to fix the bracket 4 to the frame of the seat back B. For example, the frame 42 of the bracket 4 is fixed to the metal wire of the frame of the seat back B by welding.

[0074] The housing 3 is mounted on the bracket 4, thereby connecting it to the seat back B via the bracket 4. The housing 3 includes a receiving portion and a mounting portion 32. The receiving portion is formed in the shape of a box with an opening on one side, and a groove 31 is formed inside it. The receiving portion passes through the mounting hole 41 of the bracket 4, while the mounting portion 32 is a flange extending outward from the receiving portion, which can be engaged with the edge 42 of the mounting hole 41 of the bracket 4.

[0075] The shape of the groove 31 corresponds to the opening of the locking plate 2. That is, the length of the groove 31 in one direction (first direction) is greater than or equal to the length of the handle 11 of the locking rod 1, so that the handle 11 of the locking rod 1 can be accommodated in the groove 31 in that direction. See [reference needed]. Figure 10 The length of the groove 31 in another direction (second direction) is less than the length of the handle 11 of the locking rod 1, see [reference]. Figure 9In this embodiment, the horizontal opening length of the groove 31 is greater than the length of the handle 11 of the locking rod 1, while the vertical opening length of the groove 31 is less than the length of the handle 11 of the locking rod 1. That is, the first direction is horizontal and the second direction is vertical. The groove 31 is used to accommodate the locking rod 1. When the locking rod 1 is rotated and released, the handle 11 of the locking rod 1 can enter the groove 31 under the force of the spring 6.

[0076] See Figure 2 and Figure 6 The rod 12 passes through the plate hole 21 of the card plate 2 and the groove 31 of the housing 3 and extends out from the bottom surface of the groove 31.

[0077] See Figure 1 The bottom surface of the groove 31 has two buffer holes 33 for installing the buffer 5.

[0078] The outer side of the housing 3 has multiple slots 37, and the bracket 4 has clips 43. The clips 43 of the bracket 4 are engaged in the slots 37 of the housing 3, thereby connecting the housing 3 and the bracket 4. Of course, the slots 37 and the clips 43 can be interchanged; that is, the slots can be formed on the bracket 4, and the clips can be formed on the housing 3. Alternatively, the housing 3 and the bracket 4 can also be formed as a single unit.

[0079] See Figure 5 The pin 7 is inserted into the pin hole 13 of the rod portion 12 of the locking rod 1 to restrict the axial movement of the locking rod 1, thereby allowing the locking rod 1 to be installed on the housing 3.

[0080] See Figure 4 and Figure 5 A retaining ring groove 71 is formed in the middle of the pin 7. The retaining ring 8 is engaged in the retaining ring groove 71 of the pin 7 to connect the pin 7 to the rod portion 12 of the locking rod 1. The retaining ring 8 is inserted into the slot 16 of the rod portion 12 of the locking rod 1, which limits the movement of the retaining ring 8 along the axial direction of the pin 7, thereby preventing the pin 7 from moving in the axial direction.

[0081] See Figure 2 and Figure 5 Spring 6 is arranged outside the groove 31 and between the pin 7 and the bottom plate 38 of the groove 31 of the housing 3. Spring 6 can apply an elastic force to the locking rod 1 so that the locking rod 1 can be pressed against the clamping plate 2 or the housing 3.

[0082] In one example, the locking mechanism according to an embodiment of the invention further includes a washer 9. The washer 9 is arranged between the spring 6 and the pin 7, thereby providing a larger engagement surface for their engagement, thereby allowing the force of the spring 6 to act more effectively on the pin 7.

[0083] See Figure 1The buffer element 5 is arranged within the inner surface of the bottom plate 38 of the groove 31 of the housing 3, and cooperates with the buffer post 17 of the locking rod 1 to buffer the rebound impact of the locking rod 1. In this embodiment, there are two buffer elements, corresponding to the left and right buffer posts 17 on the left and right sides of the handle 11 of the locking rod 1, respectively.

[0084] See Figure 3 To facilitate better operation of the locking lever 1, the locking mechanism for the seat extension plate according to an embodiment of the present invention further includes a guide block 14 formed on the lever portion 12. The guide block 14 is disposed adjacent to and located inside the pin hole 13 (i.e., near the handle portion 11), and protrudes radially outward from the outer periphery of the pin 7. The inner side of the guide block 14 is an arcuate surface 14a for engaging with the guide surface 35 (described in detail later) of the housing 3. In this embodiment, there are two guide blocks 14 arranged in opposite directions along the radial direction of the lever portion 12.

[0085] The guide block 14 is always pressed against the guide surface 35 of the groove 31 (described in detail later) by the pressure of the spring 6. When the user rotates the locking rod 1, the movement of the guide block 14 on the guide surface 35 causes the locking rod 1 to move axially.

[0086] The rod portion 12 also has a connecting block 15; the connecting block 15 is located inside the guide block 14 (i.e., near the handle portion 11); the connecting block 15 is used to engage with the guide hole 34 (described in detail later) of the housing 3. The height of the connecting block 15 is approximately the same as the height of the guide block 14. In this embodiment, there are two connecting blocks 15, which are arranged in opposite directions along the radial direction of the rod portion 12. In one example, the surface of the connecting block 15 is formed with protrusions 15a to increase the friction between it and the guide hole 34 of the housing 3.

[0087] See Figure 2 and Figure 6 The bottom surface 31a of the groove 31 has a guide hole 34, through which the rod portion 12 of the locking rod 1 can pass. The guide hole 34 is formed to extend outward from the bottom plate 38 of the groove 31, and the interior of the guide hole 34 is stepped. The side of the guide hole 34 has a notch 36 corresponding to the guide block 14 and the engaging block 15 of the rod portion 12, so that the rod portion 12 can pass through the notch 36 to install the locking rod 1 onto the housing 3.

[0088] A guide surface 35 is formed on the outer surface of the guide hole 34. This guide surface 35 contacts the arcuate surface 14a of the guide block 14 to guide the movement of the locking rod 1 in the axial direction. The guide surface 35 is stepped and includes a first section 35a, a transition section 35b, a second section 35c, and a stop portion 35d. The distances between the first section 35a, the second section 35c, and the stop portion 35d and the bottom surface 31a increase sequentially. When the guide block 14 of the locking rod 1 contacts the first section 35a, the locking rod 1 is in a retracted state (i.e., the handle 11 of the locking rod 1 is located in the groove 31 of the housing 3, such as...). Figure 10 As shown), when the guide block 14 of the locking rod 1 contacts the second section 35c, the locking rod 1 is in a retracted state (i.e., the handle 11 of the locking rod 1 is locked against the edge of the cross hole of the clamping plate 2, as shown). Figure 9 (As shown). The transition section 35b is an inclined portion, which allows the guide block 14 to move smoothly from the first section 35a to the second section 35c. The stop 35d is used to prevent the locking lever 1 from rotating further.

[0089] Figure 11 This is a schematic diagram of a variation of the locking mechanism for a seat extension plate according to an embodiment of the present invention, wherein the seat extension plate A can be attached to the seat backrest B by a magnet 10.

[0090] Figure 14 This is a schematic diagram of a locking mechanism for a seat extension plate according to another embodiment of the present invention in the unfolded state of the seat extension plate, wherein there are two locking mechanisms.

[0091] The following describes the usage process of the locking mechanism for the seat extension plate according to an embodiment of the present invention.

[0092] When seat extension plate A is needed, it needs to be switched from the retracted state to the extended state. At this time, the handle 11 of locking lever 1 is in a vertical position and the handle 11 presses against the plate hole 21 of locking plate 2.

[0093] When the handle 11 of the locking rod 1 is rotated 90° from a vertical position to a horizontal position, the handle 11 aligns with the first-direction hole of the plate hole 21 of the locking plate 2 and the groove 31 of the housing 3, allowing the handle 11 to pass through the plate hole 21 and enter the groove 31 of the housing 3. Then, the handle 11 of the locking rod 1 is released, and the locking rod 1 moves axially towards the groove 31 under the action of the spring 6 until the buffer post 17 of the locking rod 1 contacts the buffer member 5 located on the bottom surface of the groove 31 of the housing 3. At this time, the handle 11 of the locking rod 1 is fully inserted into the groove 31 of the housing 3 without protruding outward. This causes the seat extension plate A to be in the unfolded state.

[0094] When it is necessary to fold up the seat extension panel A, fold the seat extension panel A back up. Then, using the plate hole 21 of the locking plate 2 and the groove 31 of the housing 3, the user can grasp the handle 11 of the locking rod 1 and pull the locking rod 1 outward (at this time, the handle 11 of the locking rod 1 is in a horizontal state) to disengage the locking rod 1 from the groove 31 of the seat extension panel A and the plate hole 21 of the locking plate 2. Then, rotate the handle 11 of the locking rod 1 to a vertical state and release the locking rod 1 so that the handle 11 presses against the edge of the plate hole 21 of the locking plate 2, thereby locking the locking plate 2 onto the seat back B. Thus, the seat extension panel A is in the folded-up state.

[0095] According to an embodiment of the present invention, the locking mechanism for the seat extension panel allows the seat extension panel A to open and form a bed together with the seat back and luggage compartment when the seat back is laid flat, allowing the user to lie down and rest. The locking rod according to the embodiment of the present invention can be concealed in a groove in the seat back, preventing it from protruding from the seat back when the seat extension panel is unfolded to form the bed. When the seat is in use and the seat extension panel is not in use, the locking rod is concealed, eliminating any protrusion from the seat back. This embodiment of the present invention improves the comfort of the rear seat rest space. Furthermore, the locking mechanism according to the embodiment of the present invention is simple in structure, easy to operate, and inexpensive.

[0096] Although the locking mechanism for the seat extension plate according to an embodiment of the present invention is for a vehicle seat, it can also be installed on seats of other means of transportation besides vehicles, such as seats of ships, airplanes and other vehicles.

[0097] The foregoing description of specific exemplary embodiments of the invention is for illustrative and descriptive purposes. It is not intended to be exhaustive, nor to limit the invention to the precise forms disclosed; clearly, many changes and variations are possible in accordance with the foregoing teachings. The exemplary embodiments were chosen and described to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to implement and utilize various exemplary embodiments of the invention, as well as their different alternatives and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A locking mechanism for a seat extension panel for releasable mounting of a seat extension panel to a seat back, characterised in that, The locking mechanism for the seat extension plate comprises a clamping plate, a housing, a support, a locking rod, a spring and a pin shaft; The clamping plate is installed on the seat extension plate, and the clamping plate is formed with an opening; The support is installed on the seat backrest; The housing is installed on the support, and the housing is formed with a groove; The locking rod comprises a handle portion and a rod portion, the rod portion passes through the opening of the clamping plate and the groove of the housing and extends from the bottom surface of the groove, and the end of the rod portion is formed with a pin hole; The pin shaft is inserted into the pin hole of the end of the rod portion; The spring is arranged between the outer side surface of the groove and the pin shaft; When the seat extension plate needs to be unfolded, the locking rod is rotated and passes through the opening of the clamping plate into the groove of the housing, so that the seat extension plate can be opened beyond the locking rod; When the seat extension plate needs to be folded, the seat extension plate is close to the seat backrest, the locking rod is pulled out and rotated, and the handle portion of the locking rod is clamped on the edge of the opening of the clamping plate.

2. The locking mechanism for a seat extension panel according to claim 1, wherein The opening of the clamping plate is a cross-shaped hole, and the cross-shaped hole comprises a first direction opening and a second direction opening, wherein the length of the first direction opening is greater than or equal to the length of the handle portion, and the length of the second direction opening is less than the length of the handle portion; The groove of the housing is a cross-shaped groove, and the cross-shaped groove comprises a first direction groove and a second direction groove, wherein the length of the first direction groove is greater than or equal to the length of the handle portion, and the length of the second direction groove is less than the length of the handle portion.

3. The locking mechanism for a seat extension panel according to claim 2, wherein, The first direction is a horizontal direction, and the second direction is a vertical direction.

4. The locking mechanism for a seat extension panel according to claim 1, wherein The locking mechanism for the seat extension plate further comprises a buffer piece arranged inside the bottom surface of the groove; and the handle portion is formed with a buffer column corresponding to the buffer piece.

5. The locking mechanism for a seat extension panel according to claim 1, wherein, One of the support and the housing is formed with a clamping piece, the other of the support and the housing is formed with a clamping groove, and the clamping piece and the clamping groove are matched to mount the housing on the support.

6. The locking mechanism for a seat extension panel according to claim 1, wherein, The pin shaft is formed with a clamping spring groove, and a clamping spring is clamped in the clamping spring groove.

7. The locking mechanism for a seat extension panel according to claim 6, wherein The clamping spring groove is located in the middle of the pin shaft, the end of the locking rod is formed with a hole, the hole is formed with a slot, and the clamping spring is clamped into the clamping spring groove of the pin shaft along the slot.

8. The locking mechanism for a seat extension panel according to claim 1, wherein, The end of the rod portion is formed with a guide block, and the guide block is located inside the pin shaft; the bottom surface of the groove is formed with a guide hole, the outer side surface of the guide hole is formed with a guide surface, and the guide block is engaged with the guide surface under the action of the spring.

9. The locking mechanism for a seat extension panel according to claim 8, wherein, The guide surface comprises a first section, a transition section, a second section and a stop portion, wherein the extension distances of the first section, the second section and the stop portion from the bottom surface of the groove increase in turn, and the transition section is an inclined part between the first section and the second section.

10. The locking mechanism for a seat extension panel according to claim 9, wherein, The rod portion is formed with an engaging block engaged with the guide hole; and the engaging block is located closer to the handle portion than the guide block.

11. The locking mechanism for a seat extension panel according to claim 1, wherein, The locking mechanism for the seat extension plate further comprises a gasket arranged between the spring and the pin shaft.

12. The locking mechanism for a seat extension panel according to claim 1, wherein, The side surface of the handle portion is formed with a gripping portion, and the gripping portion is formed with a convex point.

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