A double four-bar linkage mechanism for a tabletop and a small tabletop

Abstract

A double four-bar linkage for a tabletop disclosed by the present invention includes a small tabletop and a pair of bracket assemblies. There are parallel notches provided on the small tabletop. It further includes: a pair of bracket assemblies fixed on a backrest assembly; a pair of first, second, and third linkages and a pair of small tabletop covers. One ends of the first linkage and the third linkage are both hinged on the bracket assemblies, and the other ends of the first linkage and the third linkage are both hinged on the small tabletop. One end of the second linkage is fixedly connected to the other end of the first linkage. Each small tabletop cover is slidably disposed in the notch. When the small tabletop is in use, the small tabletop cover covers the notch. One end of each small tabletop cover is hinged to the other end of the second linkage, and the other end of the small tabletop cover is slidably disposed in the small tabletop. The present invention also discloses a small tabletop including the above double four-bar linkage for a tabletop. The present invention retains the space in the four-bar movement process and realizes the function of covering the exposed notch.

Description

Technical Field

[0001] The present invention relates to the technical field of seat accessories, and particularly relates to a double four-bar linkage mechanism for a table board and a small table board. Background Art

[0002] To facilitate rear passengers, a small table board that can be opened is usually arranged on the backrest of the front seat. When needed, the passenger can open the small table board through a button for use.

[0003] Currently, there are two installation methods for the small table board 1 on motor vehicles. One is as Figure 1 shown, the small table board 1 is installed at the bottom of the seat backrest 2 by a single rotating shaft. Although this single rotating shaft mechanism is simple, it occupies a large space when opened, resulting in a small usable area of the small table board and easy interference between the small table board 1 and the occupant's legs. The other is as Figure 2 described, the small table board 1 is installed at the top of the seat backrest 2 by a single rotating shaft, and there is also easy interference between the small table board 1 and the occupant's legs when the small table board 1 is opened.

[0004] In the prior art, the small table board is often accidentally unlocked and opened, causing great inconvenience. Especially in the rear collision experiment of the seat, the small table board of the seat in the prior art often has an accidental unlocking situation and cannot meet the experimental requirements.

[0005] For this reason, the Chinese Utility Model Patent Authorization Publication No. CN210733923 discloses a seat with a pop-up small table board, which has a backrest assembly, a small table board assembly, and a button assembly. The small table board assembly is rotatably installed on the backrest assembly, and the button assembly is pressably installed on the backrest assembly. The small table board is locked in the closed position by the button assembly and rotates to the open position after unlocking. The button assembly includes a button and a locking tongue. The button cooperates with the locking tongue to convert the downward pressing movement of the button into the rotational movement of the locking tongue to lock and unlock the small table board assembly. The top end of the small table board assembly has a groove, and the locking tongue has a hook portion. The hook portion is received in the groove to lock the small table board assembly in the closed position by the button assembly. The hook portion disengages from the groove under the external force applied to the button to unlock the small table board assembly and make it rotate to the open position.

[0006] The small table board assembly in this patent includes a table board skeleton, and the table board skeleton includes a mounting bracket, a frame, a first link, and a second link. The mounting bracket is fixedly connected to the backrest assembly, and both ends of the first link and the second link are rotatably connected between the mounting bracket and the frame. See Figure 3 and Figure 4, during the use of the small table board assembly in this way, its first connecting rod 4 will expose the surface (i.e., the table top) of the upper cover plate 12 of the small table board 1, which reduces the effective use area of the small table board; in addition, the small table board assembly is provided with an avoidance groove according to the trajectory of the connecting rod, and there will be a problem that foreign objects are stuck in the table board surface and are not easy to clean. Summary of the Invention

[0007] One of the technical problems to be solved by the present invention is to provide a double four-bar linkage mechanism for a table board, which enables the connecting rod to be buried below the table top of the small table board during the use of the small table board, so that the entire table top of the small table board can be used.

[0008] Another technical problem to be solved by the present invention is to provide a small table board including the above-mentioned double four-bar linkage mechanism for a table board.

[0009] In order to achieve the above-mentioned invention purpose, the double four-bar linkage mechanism for a table board of the present invention includes a small table board and a pair of bracket assemblies, and mutually parallel notch openings are provided on the small table board; it further includes:

[0010] A pair of bracket assemblies fixed on the backrest assembly;

[0011] A pair of first connecting rods, one end of the first connecting rod is hinged on the bracket assembly, and the other end of the first connecting rod is hinged on the small table board;

[0012] A pair of second connecting rods, one end of the second connecting rod is fixedly connected to the other end of the first connecting rod;

[0013] A pair of small table board cover caps, each small table board cover cap is slidably arranged in the notch opening, and when the small table board is in the use state, the small table board cover cap covers the notch opening; one end of each small table board cover cap is hinged together with the other end of the second connecting rod, and the other end of the small table board cover cap is slidably arranged in the small table board;

[0014] A pair of third connecting rods, one end of the third connecting rod is hinged on the bracket assembly, and the other end of the third connecting rod is hinged on the small table board; wherein the distance between the hinge point between the other end of the first connecting rod and the small table board and the bracket assembly is greater than the distance between the hinge point between the other end of the third connecting rod and the small table board and the bracket assembly.

[0015] In a preferred embodiment of the present invention, a damping assembly is provided at the hinge point between the other end of the first connecting rod and the small table board.

[0016] In a preferred embodiment of the present invention, one end of the first connecting rod is hinged on the upper end of the bracket assembly, and one end of the third connecting rod is hinged on the lower end of the bracket assembly.

[0017] In a preferred embodiment of the present invention, a pair of sliding grooves are provided in the small table board, and the other end of the cover of the small table board is slidably disposed in the sliding grooves.

[0018] In a preferred embodiment of the present invention, a sliding shaft is disposed at the other end of the cover of the small table board, and the sliding shaft slides in the sliding grooves.

[0019] In a preferred embodiment of the present invention, a rotating shaft hole is provided at one end of the cover of the small table board, and a rotating shaft is provided in the rotating shaft hole, and the rotating shaft is hinged to the other end of the second connecting rod.

[0020] In a preferred embodiment of the present invention, the sliding groove has a straight section and an inclined section. When the small table board is in the retracted state, the other end of the cover of the small table board is slidably disposed in the straight section. When the small table board is in the use state, the other end of the cover of the small table board is slidably disposed in the inclined section.

[0021] In a preferred embodiment of the present invention, the first connecting rod is composed of three sections, namely, the first section of the first connecting rod, the second section of the first connecting rod, and the third section of the first connecting rod. One end of the first section of the first connecting rod is hinged to the upper end of the bracket assembly. One end of the second section of the first connecting rod is integrally connected to the other end of the first section of the first connecting rod, and a first internal angle less than 90° is formed therebetween. One end of the third section of the first connecting rod is integrally connected to the other end of the second section of the first connecting rod, and the other end of the third section of the first connecting rod is hinged to the small table board. When the small table board is in the use state, the first section of the first connecting rod is parallel to the bracket assembly, the second section of the first connecting rod is parallel to the small table board, and the third section of the first connecting rod is lower than the upper surface of the small table board and forms a second internal angle less than 90° with the second connecting rod.

[0022] In a preferred embodiment of the present invention, the third connecting rod is composed of three sections, namely, the first section of the third connecting rod, the second section of the third connecting rod, and the third section of the third connecting rod. One end of the first section of the third connecting rod is hinged to the lower end of the bracket assembly. One end of the second section of the third connecting rod is integrally connected to the other end of the first section of the third connecting rod, and a third internal angle greater than 90° is formed therebetween. One end of the third section of the third connecting rod is integrally connected to the other end of the second section of the third connecting rod, and a fourth internal angle greater than 90° is formed therebetween. The other end of the third section of the third connecting rod is hinged to the small table board. When the small table board is in the use state, the first section of the third connecting rod is substantially perpendicular to the bracket assembly; the third section of the third connecting rod is substantially parallel to the small table board.

[0023] The small table board of the present invention includes the above-mentioned double four-bar linkage of the table board and is installed on the seat back through the above-mentioned double four-bar linkage of the table board.

[0024] Due to the adoption of the above technical solution, the present invention uses two sets of four-bar linkages, so that during the use of the small table board, the linkages will be buried below the table top of the small table top, enabling the entire table top of the small table board to be used. It retains the space during the movement of the four-bar linkage and realizes the function of exposing the covering notch. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a use state of an existing small table board.

[0026] Figure 2 It is a schematic diagram of another use state of an existing small table board.

[0027] Figure 3 and Figure 4 It is a schematic diagram of the small table board in a seat with a pop-up small table board disclosed in CN210733923U in a use state.

[0028] Figure 5 It is a schematic diagram (viewed from one angle) of the double four-bar linkage of the table board of the present invention when the small table board is in a use state.

[0029] Figure 6 It is a schematic diagram of the small table board of the double four-bar linkage of the table board of the present invention relative to the seat back when the small table board is in an unused state.

[0030] Figure 7 It is a schematic diagram of the small table board of the double four-bar linkage of the table board of the present invention relative to the seat back when the small table board is in a use state.

[0031] Figure 8 It is an enlarged schematic diagram of the double four-bar linkage of the table board of the present invention when the small table board is in a use state.

[0032] Figure 9 It is a schematic diagram of the double four-bar linkage of the table board of the present invention installed on the backrest sheet metal base.

[0033] Figure 10 It is Figure 9 A-A cross-sectional view of

[0034] Figure 11 It is an exploded schematic diagram of the double four-bar linkage of the table board of the present invention installed on the backrest sheet metal base.

[0035] Figure 12 It is a schematic diagram of the state of the double four-bar linkage of the table board of the present invention when it is opened.

[0036] Figure 13This is a schematic diagram of the state of the double four-bar linkage of the tabletop of the present invention when it is folded.

[0037] Figure 14 This is a schematic diagram of the structure of a pair of bracket assemblies.

[0038] Figure 15 This is a schematic diagram of the structure of the tabletop skeleton body assembly in the small tabletop.

[0039] Figure 16 This is a schematic diagram of the structures of the first link and the second link.

[0040] Figure 17 This is a schematic diagram of the structure of the small tabletop cover.

[0041] Figure 18 This is a schematic diagram of the structure of the third link.

[0042] Figure 19 This is a schematic diagram of the chute structure inside the small tabletop.

[0043] Figure 20 This is an assembly schematic diagram of the first link, the second link, the third connection and the bracket assembly.

[0044] Figure 21 For Figure 20 The B-B sectional view of

[0045] Figure 22 This is an assembly schematic diagram between the first link, the second link, the third connection and the tabletop skeleton body assembly.

[0046] Figure 23 For Figure 22 The C-C sectional view of

[0047] Figure 24 For Figure 22 The D-D sectional view of

[0048] Figures 25a to 25d This is a schematic diagram of the opening process of the double four-bar linkage of the tabletop of the present invention.

[0049] Figure 26 This is a schematic diagram of the double four-bar linkage of the tabletop of the present invention when the small tabletop is in the use state (from another angle).

[0050] Figure 27 This is a schematic diagram of the structure of the double four-bar linkage of the tabletop of the present invention when the small tabletop is in the use state

[0051] Figure 28 This is a schematic diagram of the positions of the first link, the second link and the third link when the small tabletop in the double four-bar linkage of the tabletop of the present invention is folded.

[0052] Figure 29Schematic diagram of the positions of the first link, the second link and the third link when the small tabletop in the double four-bar linkage of the tabletop of the present invention is in the opening process.

[0053] Figure 30 Schematic diagram of the positions of the first link, the second link and the third link when the small tabletop in the double four-bar linkage of the tabletop of the present invention is in use.

[0054] Figure 31 Schematic diagram of the state of the small tabletop in the double four-bar linkage of the tabletop of the present invention when it is folded.

[0055] Figure 32 Schematic diagram of the state of the small tabletop in the double four-bar linkage of the tabletop of the present invention when it is in the opening process.

[0056] Figure 33 Schematic diagram of the state of the small tabletop in the double four-bar linkage of the tabletop of the present invention when it is in use.

[0057] Figure 34 Schematic diagram of the positions of the first link, the second link and the small tabletop cover when the small tabletop in the double four-bar linkage of the tabletop of the present invention is folded.

[0058] Figure 35 Schematic diagram of the positions of the first link, the second link and the small tabletop cover when the small tabletop in the double four-bar linkage of the tabletop of the present invention is in the opening process.

[0059] Figure 36 Schematic diagram of the positions of the first link, the second link and the small tabletop cover when the small tabletop in the double four-bar linkage of the tabletop of the present invention is in use. Detailed implementation manners

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0061] Refer to Figures 5 to 8 , the tabletop double four-bar linkage shown in the figure includes a small tabletop 100 and a pair of bracket assemblies 400; it further includes: a pair of first links 500, a pair of second links 600, a pair of small tabletop covers 700 and a pair of third links 800.

[0062] Refer to in combination Figures 9 to 11 , a pair of bracket assemblies 400 are fixedly mounted on the backrest sheet metal base 210 in parallel by four bolts 410 and four nuts 420.

[0063] Refer to in combination Figure 16, the first link 500 consists of three segments, namely the first segment 510 of the first link, the second segment 520 of the first link, and the third segment 530 of the first link. One end of the second segment 520 of the first link is integrally connected to the other end of the first segment 510 of the first link, and a first internal angle a less than 90° is formed therebetween. One end of the third segment 530 of the first link is integrally connected to the other end of the second segment 520 of the first link.

[0064] One end of the second link 600 is integrally connected to the other end of the third segment 530 of the first link, and a second internal angle b less than 90° is formed therebetween.

[0065] Specifically refer to Figure 18 , the third link 800 also consists of three segments, namely the first segment 810 of the third link, the second segment 820 of the third link, and the third segment 830 of the third link. One end of the second segment 820 of the third link is integrally connected to the first segment 810 of the third link, and a third internal angle c greater than 90° is formed therebetween. One end of the third segment 830 of the third link is integrally connected to the second segment 820 of the third link, and a fourth internal angle d greater than 90° is formed therebetween.

[0066] Refer to in combination Figure 26 , the small table board 100 includes a table board skeleton body assembly 110, an upper cover plate 120 and a lower cover plate 130 installed on the table board skeleton body assembly 110. Two slot openings 121 are provided in parallel on the upper cover plate 120.

[0067] Specifically refer to Figures 20 to 21 , one end of the first segment 510 of the first link is hinged to the upper end of the bracket assembly 400 through a step rivet 511 and a bushing 512. Specifically refer to Figure 22 and Figure 24 , the other end of the third segment 530 of the first link is hinged to the table board skeleton body assembly 110 through a screw 531 and a washer 532, and the screw 531 can rotate within the washer 532. In addition, a damping assembly 533 is also installed on the screw 531 to play a damping role in the flipping of the small table board 100.

[0068] One end of the first segment 810 of the third link is also hinged to the lower end of the bracket assembly 400 through a step screw. Specifically refer to Figure 22 and Figure 24 , the other end of the third segment 830 of the third link is hinged to the table board skeleton body assembly 110 through a screw 831 and a washer 832, and the screw 831 can rotate within the washer 832.

[0069] Refer to Figure 27The distance between the hinge point A between the other end of the third end 530 of the first link and the tabletop frame body assembly 110 and the bracket assembly 400 is greater than the distance between the hinge point B between the other end of the third section 830 of the third link and the tabletop frame body assembly 110 and the bracket assembly 400.

[0070] Refer to Figure 17 、 Figure 18 、 Figure 26 、 Figure 27 、 Figures 31 to 36 A pair of small tabletop covers 700 are slidably disposed in the notch 121. When the small tabletop 100 is in the use state, the small tabletop covers 700 completely cover the notch 121 to prevent foreign objects from entering the notch 121.

[0071] A rotating shaft hole 710 is provided at one end of the small tabletop cover 700. A rotating shaft 711 is disposed in the rotating shaft hole 710. The rotating shaft 711 is hinged to the other end of the second link 600. A sliding shaft 720 is disposed at the other end of the small tabletop cover 700. A sliding groove 111 is provided in the tabletop frame body assembly 110. The sliding shaft 720 slides in the sliding groove 111. The sliding groove 111 has a straight section 111a and an inclined section 111b.

[0072] Refer to Figures 5 to 36 The working principle of the double four-bar linkage of the tabletop of the present invention is as follows: When the small tabletop 100 is folded close to the seat back 200, at this time, the third section 530 of the first link of the first link 500 drives the second link 600 to move, and the second link 600 drives the small tabletop cover 700 to move, so that the sliding shaft 720 at the other end of the small tabletop cover 700 slides to the end of the straight section 111a of the sliding groove 111. At this time, the small tabletop cover 700 is substantially parallel to the surface of the small tabletop 100 and buried in the small tabletop 100; the first section 810 of the third link remains in a state parallel to the bracket assembly 400, and most of the first section 510 and the second section 520 of the first link are buried in the seat back 200.

[0073] When the small tabletop 100 is in the use state, the first section 510 of the first link is parallel to the bracket assembly 400, the second section 520 of the first link is parallel to the small tabletop 100, and the third section 530 of the first link is lower than the upper surface of the small tabletop 100, that is, the upper surface of the upper cover plate 120.

[0074] At the same time, when the occupant rotates the small tabletop 100 downward to turn the small tabletop 100 to the use state, the sliding shaft 720 at the other end of the small tabletop cover 700 moves along the straight section 111a of the sliding groove 111 to the inclined section 111b until it slides up to be flush with the surface of the small tabletop 100. The other end of the small tabletop cover 700 is slidably disposed at the end of the inclined section 111b to cover the notch 121.

[0075] At this time, the first section 810 of the third link is in a substantially perpendicular state to the bracket assembly 400, and the third section 830 of the third link is in a substantially parallel state to the small table 100.

Claims

1. A double four-bar linkage mechanism for a tabletop, comprising a small tabletop and a pair of bracket assemblies, with notches parallel to each other provided on the small tabletop; characterized in that, Further comprising: A pair of bracket assemblies fixed to the backrest assembly; A pair of first linkages, one end of each first linkage being hinged to the bracket assembly, and the other end of each first linkage being hinged to the small table board; A pair of second linkages, one end of each second linkage being fixedly connected to the other end of the first linkage; A pair of small table board covers, each small table board cover being slidably disposed in the notch, and when the small table board is in use, the small table board cover covers the notch; one end of each small table board cover is hinged to the other end of the second linkage, and the other end of each small table board cover is slidably disposed in the small table board; A pair of third linkages, one end of each third linkage being hinged to the bracket assembly, and the other end of each third linkage being hinged to the small table board; wherein the distance between the hinge point between the other end of the first linkage and the small table board and the bracket assembly is greater than the distance between the hinge point between the other end of the third linkage and the small table board and the bracket assembly.

2. The double four-bar linkage of a tabletop according to claim 1, wherein A damping assembly is provided at the hinge point between the other end of the first linkage and the small table board.

3. A double four-bar linkage mechanism for a tabletop as claimed in claim 1 or 2, wherein, One end of the first linkage is hinged to the upper end of the bracket assembly, and one end of the third linkage is hinged to the lower end of the bracket assembly.

4. A double four-bar linkage mechanism for a tabletop as described in claim 1, characterized in that, A pair of chutes are provided in the small table board, and the other end of the small table board cover is slidably disposed in the chutes.

5. The double four-bar linkage mechanism of a tabletop according to claim 4, characterized in that A sliding shaft is disposed at the other end of the small table board cover, and the sliding shaft slides in the chute.

6. The double four-bar linkage mechanism of a tabletop according to claim 5, characterized in that A rotating shaft hole is provided at one end of the small table board cover, and a rotating shaft is provided in the rotating shaft hole, and the rotating shaft is hinged to the other end of the second linkage.

7. The double four-bar linkage of a tabletop according to claim 6, wherein The chute has a straight section and an inclined section. When the small table board is in the retracted state, the other end of the small table board cover is slidably disposed in the straight section, and when the small table board is in use, the other end of the small table board cover is slidably disposed in the inclined section.

8. The double four-bar linkage mechanism of a tabletop according to claim 7, characterized in that, The first linkage is composed of three sections, namely the first section of the first linkage, the second section of the first linkage, and the third section of the first linkage. One end of the first section of the first linkage is hinged to the upper end of the bracket assembly. One end of the second section of the first linkage is integrally connected to the other end of the first section of the first linkage and forms a first internal angle less than 90° therebetween. One end of the third section of the first linkage is integrally connected to the other end of the second section of the first linkage. The other end of the third section of the first linkage is hinged to the small table board. When the small table board is in use, the first section of the first linkage is parallel to the bracket assembly, the second section of the first linkage is parallel to the small table board, and the third section of the first linkage is lower than the upper surface of the small table board and forms a second internal angle less than 90° with the second linkage.

9. The double four-bar linkage mechanism of a tabletop according to claim 8, characterized in that, The third link is composed of three segments, namely the first segment of the third link, the second segment of the third link, and the third segment of the third link. One end of the first segment of the third link is hinged to the lower end of the bracket assembly. One end of the second segment of the third link is integrally connected to the other end of the first segment of the third link, and a third internal angle greater than 90° is formed therebetween. One end of the third segment of the third link is integrally connected to the other end of the second segment of the third link, and a fourth internal angle greater than 90° is formed therebetween. The other end of the third segment of the third link is hinged to the small table board. When the small table board is in the use state, the first segment of the third link is substantially perpendicular to the bracket assembly; the third segment of the third link is substantially parallel to the small table board.

10. Small table board, characterized in that, Comprising the double four-bar mechanism for the table board according to any one of claims 1 to 9 and installed on the seat back by means of the above-mentioned double four-bar mechanism for the table board.

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