Headrest assembly method

Abstract

The present invention discloses a method for assembling a headrest. The headrest includes a headrest frame, a sliding carriage, and a support frame. The sliding carriage is slidably mounted on the support frame, and the headrest frame is hinged to the sliding carriage. When installing the headrest, first fix each component of the headrest, press down the headrest frame to deform the headrest frame so that the hinge holes of the headrest frame coincide with the hinge holes of the sliding carriage, and then insert the hinge shaft into the hinge holes of the headrest frame and the sliding carriage from the side of the sliding carriage. Finally, complete the assembly of the headrest; by the above method, it is convenient for a single person to operate, can quickly position each component of the headrest, and improve the assembly efficiency and assembly accuracy of the headrest.

Description

Technical Field

[0001] The present invention relates to the field of seat assembly, and particularly to a method for assembling a headrest. Background Art

[0002] Some of the current leisure chairs or office chairs on the market are equipped with headrests for supporting the human neck or head on their backs. Since the chairs need to have a certain generality to suit the body types of most users, the headrests of some chairs can be adjusted up and down to change the height and can also be swung to adjust the angle. For example, a headrest of an office chair disclosed in a patent document with the publication number CN215226131U includes a support frame, a sliding frame and a headrest. The sliding frame is installed on the support frame and can slide along the support frame, and the headrest is hinged to the sliding frame, so that the headrest is in a swingable state. The existing method for assembling the headrest is to manually assemble the support frame, the sliding frame and the headrest one by one. However, since the headrest, the support frame and the sliding frame are all injection molded parts, and the headrest is in a bent state, due to the shape, material and molding method of the headrest, the headrest will undergo slight deformation after cooling, resulting in the hinge holes of the headrest frame and the sliding frame not being aligned. Moreover, since the hinge shaft for hinging the headrest and the sliding frame needs to be tightly fitted with the headrest or the sliding frame to ensure that the headrest will not fall off during use; therefore, it is difficult to manually assemble the above components together, and the assembly accuracy and assembly efficiency of the headrest assembly are both low. Summary of the Invention

[0003] In order to solve the problems in the prior art, the purpose of the present invention is to provide a method for assembling a headrest, which can quickly assemble the relatively movable components of the headrest and improve the assembly efficiency and assembly accuracy of the headrest.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A headrest assembly method, the headrest comprising a support frame, a sliding frame and a headrest frame, the sliding frame being mounted on the support frame, a snap structure being provided between the support frame and the sliding frame such that the sliding frame can be fixed at different positions on the support frame, two hinge ears protruding upward from the sliding frame and arranged left and right, first hinge holes extending left and right being formed in both hinge ears, a plurality of limiting ridges protruding from the sliding frame and arranged front and back, the plurality of limiting ridges being located between the two hinge ears, the front and rear ends of the headrest frame being bent downward, and a hinge portion protruding from the headrest frame, a second hinge hole extending in the left-right direction being formed in the hinge portion, one end of the hinge portion opposite to the headrest frame being a limiting end, the limiting end being arc-shaped, and a plurality of limiting grooves extending front and back being formed in the limiting end, the limiting grooves being matched with the limiting ridges protruding from the sliding frame; the specific steps of assembling the headrest are as follows: Step 1) Mount the sliding frame on the support frame, and then fix the support frame and make the hinge ears of the sliding frame vertically upward; Step 2) Insert the hinge portion of the headrest frame between the two hinge ears of the sliding frame, insert some of the limiting ridges on the sliding frame into some of the limiting grooves on the hinge portion of the headrest frame, and limit the front end and the rear end of the headrest frame to prevent the headrest frame from moving forward and backward and swinging left and right; Step 3) Press down the left and right ends of the headrest frame simultaneously to deform the headrest frame so that the second hinge hole of the hinge portion of the headrest frame and the first hinge hole of the hinge ear of the sliding frame are aligned coaxially; Step 4) Insert the hinge shaft into the first hinge hole of the sliding frame and the second hinge hole of the headrest frame from the side of the sliding frame to complete the hinge connection between the headrest frame and the sliding frame; wherein, the hinge shaft is in interference fit with the first hinge hole; Step 5) Cancel the pressure applied to the headrest frame to make the headrest frame recover by itself.

[0006] Preferably, in the step 1), the way to fix the support frame is: a first positioning seat is fixed on the workbench, a positioning groove matching the support frame is provided at the top of the first positioning seat, and the support frame is placed in the positioning groove.

[0007] Preferably, in the step 2), the way to prevent the headrest frame from moving forward and backward and swinging left and right is: a second positioning seat is arranged behind the headrest frame, two third positioning seats are arranged in front of the headrest frame, the hinge portion of the headrest frame is located between the two third positioning seats, the rear end of the headrest frame abuts against the second positioning seat, the second positioning seat can support the bottom of the rear end of the headrest frame, the front end of the headrest frame abuts against the two third positioning parts, and the left and right ends of the hinge portion of the headrest frame respectively abut against the two hinge ears protruding from the sliding frame.

[0008] Preferably, a first positioning portion protrudes forward from the front end of the second positioning seat. In the step 2), the top of the first positioning portion abuts against the bottom of the rear end of the headrest frame, and the front end of the second positioning seat abuts against the rear end of the headrest frame.

[0009] Preferably, two third positioning seats are fixed on the first positioning seat, and the two third positioning seats are located on both sides of the hinge seat of the headrest frame.

[0010] Preferably, in step 3), the method of pressing down the headrest frame is as follows: a pressing plate capable of lifting is arranged on the workbench, the pressing plate is located above the headrest frame, and by moving the pressing plate up and down, the headrest frame is pressed down and released.

[0011] Preferably, a first air cylinder is installed on the workbench, and the telescopic end of the first air cylinder is connected to the pressing plate.

[0012] Preferably, a first operating handle for controlling the first air cylinder is installed on the workbench.

[0013] Preferably, in step 4), the method of inserting the hinge shaft is as follows: a second air cylinder is installed on the workbench, the second air cylinder is located on the left or right side of the first positioning seat, and the telescopic end of the second air cylinder points to the first hinge hole of the carriage; when installing the hinge shaft, the hinge shaft needs to be placed between the first hinge hole and the second air cylinder first, and then the second air cylinder is started, so that the telescopic end of the second air cylinder inserts the hinge shaft into the first hinge hole of the carriage and the second hinge hole of the headrest frame.

[0014] Preferably, a second operating handle for controlling the second air cylinder is installed on the workbench.

[0015] The beneficial effects of the technical solution of the present invention are as follows: through the above method, during the assembly of the headrest, the position of the carriage on the support frame can be adjusted before installing the headrest frame to complete the rough positioning of the carriage and the headrest frame. After the headrest frame is deformed by force, not only the headrest frame, the carriage and the support frame are fixed into a whole, but also the headrest frame can finely adjust the position of the carriage so that the first hinge hole and the second hinge hole of the headrest frame are coaxial. Furthermore, accurate positioning of the support frame, the carriage and the headrest frame can be achieved, and the coaxiality of the hinge holes of the headrest frame and the carriage hinge holes can be ensured, which is convenient for the insertion of the hinge shaft, making the assembly process of the headrest easier and greatly improving the assembly efficiency and assembly accuracy of the headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic connection structure diagram of the headrest and the assembly tooling in the present invention;

[0017] Figure 2 is a schematic structure diagram of the assembly tooling Figure 1 ;

[0018] Figure 3 is a schematic structure diagram of the assembly tooling Figure 2 ;

[0019] Figure 4 is a schematic structure diagram of the headrest;

[0020] Figure 5 is a structural schematic diagram of a support frame;

[0021] Figure 6 is a structural schematic diagram of a carriage;

[0022] Figure 7 is a structural schematic diagram of a headrest frame.

[0023] Reference numerals: 1, workbench; 11, foot; 2, first positioning seat; 21, positioning groove; 22, third positioning seat; 31, fixing plate; 32, support rod; 33, first cylinder; 34, telescopic end of the first cylinder; 35, pressing plate; 36, pressing block; 37, guide sleeve; 38, guide post; 39, first operating handle; 4, second cylinder; 41, telescopic end of the second cylinder; 42, second operating handle; 5, second positioning seat; 51, first positioning portion; 61, support frame; 611, opening; 612, sliding groove; 613, clamping groove; 62, carriage; 621, hinge ear; 622, limiting rib; 623, hinge center; 63, headrest frame; 631, hinge portion; 632, second hinge hole. Detailed Description of the Invention

[0024] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0027] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the following embodiments, the directions mentioned are Figure 1 subject to the directions shown, Figure 1 wherein the position of the workbench is regarded as the lower, and the position relative to the workbench is regarded as the upper in sequence, and the left and right are determined based on the above upper and lower.

[0030] Embodiment 1

[0031] Such as Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7The headrest shown, the headrest includes a support frame 61, a sliding frame 62 and a headrest frame 63; the sliding frame 62 is mounted on the support frame 61, and a buckle structure is provided between the support frame 61 and the sliding frame 62 so that the sliding frame 62 can be fixed at different positions on the support frame 61. Specifically, the support frame 61 is provided with an upward opening 611, the opening 611 extends forward at the same time, a sliding groove 612 is opened on the side wall of the opening 611, and a front-back extending clamping groove 613 is opened on the bottom of the opening 611. The bottom wall of the clamping groove 613 is wavy. The left and right ends of the sliding frame 62 protrude with sliding parts. The two sliding parts of the sliding frame 62 are respectively inserted into the two sliding grooves 612 on the support frame 61, so that the sliding frame 62 can slide back and forth along the sliding groove 612. A buckle or a clamping strip is arranged at the bottom of the sliding frame 62. The buckle is in contact with the wavy bottom wall of the clamping groove 613 of the support frame 61, and thus the sliding frame 62 can be fixed at different positions on the support frame 61; two left-right arranged hinge ears 621 protrude upward on the sliding frame 62. A first hinge hole extending left and right is opened on each of the two hinge ears 621. The part of the sliding frame 62 between the two hinge ears 621 is the first limiting end. The first limiting end is recessed downward in an arc shape, and a plurality of front-back arranged limiting protrusions 622 protrude on the arc-shaped end surface of the first limiting end; the front and rear ends of the headrest frame 63 are bent downward, and a hinge part 631 protrudes on the headrest frame 63. A second hinge hole 632 extending in the left-right direction is opened on the hinge part 631. The end of the hinge part 631 opposite to the headrest frame 63 is the second limiting end. The second limiting end of the headrest frame 63 matches the first limiting end of the connecting seat. The second limiting end is arc-shaped, and a plurality of front-back arranged limiting grooves are opened on the limiting end. The limiting grooves match the limiting protrusions 622 protruding on the sliding frame 62.

[0032] An assembly method for quickly assembling the above headrest, the specific steps are as follows. Step 1): Install the carriage 62 on the support frame 61, and then fix the support frame 61 and make the hinge ears 621 of the carriage 62 vertically upward. Step 2): Insert the hinge part 631 of the headrest frame 63 between the two hinge ears 621 of the carriage 62. Some of the limiting ribs 622 on the carriage 62 are inserted into some of the limiting grooves on the hinge part 631 of the headrest frame 63, and the front end and the rear end of the headrest frame 63 are restricted to prevent the headrest frame 63 from moving forward and backward and swinging left and right. Step 3): Press down the left and right ends of the headrest frame 63 simultaneously to deform the headrest frame 63, and the deformed headrest frame 63 can finely adjust the relative positions of the first hinge hole of the carriage 62 and the second hinge hole 632 of the headrest frame 63, so that the second hinge hole 632 of the hinge part 631 of the headrest frame 63 and the first hinge hole of the hinge ear 621 of the carriage 62 are centered and coaxial. Step 4): Insert the hinge shaft 623 into the first hinge hole of the carriage 62 and the second hinge hole 632 of the headrest frame 63 from the side of the carriage 62 to complete the hinge connection between the headrest frame 63 and the carriage 62. Among them, the hinge shaft 623 is in a tight fit with the first hinge hole. Step 5): Cancel the pressure applied to the headrest frame 63 to make the headrest frame 63 recover by itself.

[0033] Through the above method, during the headrest assembly process, the support frame 61, the carriage 62 and the headrest frame 63 can be accurately positioned, and the coaxiality of the hinge holes of the headrest frame 63 and the hinge holes of the carriage 62 can be ensured, which is convenient for the insertion of the hinge shaft 623, making the headrest assembly process easier and greatly improving the assembly efficiency and assembly accuracy of the headrest.

[0034] Such as Figures 1-3As shown, in this embodiment, the installation of the headrest is assisted by an assembly tooling, making the headrest installation process more automated and efficient. The assembly tooling includes a workbench 1, on which a plurality of positioning seats for restricting the movement of the headrest frame 63 and the carriage 62 are installed. The plurality of positioning seats include a first positioning seat 2, a second positioning seat 5, and a third positioning seat 22. The first positioning seat 2 is located below the headrest frame 63, and a positioning groove 21 matching the carriage is formed on the first positioning seat 2. The second positioning seat 5 is located behind the headrest frame 63, and the second positioning seat 5 abuts against the headrest frame 63 and supports the rear end of the headrest frame 63. The third positioning seat 22 is located in front of the headrest frame 63, and the third positioning seat 22 abuts against the headrest frame 63 and supports the front end of the headrest frame 63. The assembly assisting device further includes a pressing component for pressing down the headrest frame 63. In step 1), the support frame 61 is placed in the positioning groove 21 of the first positioning seat 2, so that the support frame 61 cannot move forward, backward, left, right, or downward. At this time, however, the carriage 62 can slide back and forth on the support frame 61. In step 2), the position of the carriage 62 is adjusted, and the hinge portion 631 of the headrest frame 63 is inserted between the two hinge ears 621 of the carriage 62, so that the two hinge ears 621 clamp the hinge portion 631 of the headrest frame 63, making the headrest frame 63 unable to move left and right or swing. At the same time, the second positioning seat 5 abuts against the rear end of the headrest frame 63, and the third positioning seat 22 abuts against the front end of the headrest frame 63, so that the headrest frame 63 cannot move back and forth, and the limiting groove for the headrest frame 63 is engaged with the limiting rib 622 of the carriage 62, making the carriage 62 unable to slide back and forth on the support frame 61. Further, the second positioning seat 5 is fixed on the first positioning seat 2, making the structure of the tooling more compact.

[0035] As Figure 3As shown, a first positioning portion 51 protrudes from the front end of the second positioning seat 5. The top of the first positioning portion 51 is arc-shaped. In the step (2), the front end of the second positioning seat 5 abuts against the rear end of the headrest frame 63, and the top of the first positioning portion 51 abuts against the bottom of the rear end of the headrest frame 63. Further, the hinge portion 631 of the headrest frame 63 is located at the middle position of the front end of the headrest frame 63. After the headrest frame 63 is installed on the assembly tooling, the second positioning seat 5 is located behind the hinge portion 631 of the headrest frame 63, and the second positioning seat 5 abuts against the middle position of the rear end of the headrest frame 63. There are two third positioning seats 22, and the two third positioning seats 22 are symmetrically arranged on the left and right sides of the hinge portion 631 of the headrest frame 63. In this way, the first positioning seat 2 and the two second positioning seats 5 form a stable triangular support structure, which can effectively prevent the headrest frame 63 from swinging during the installation process, ensure the stability of the headrest assembly process, and ensure the consistency of the deformation of the headrest frame 63 when pressing down the headrest frame 63. In other embodiments, in order to enable the assembly tooling to have more sufficient support for the headrest frame 63, second positioning portions protrude from the rear ends of two of the third positioning seats 22. The second positioning portions are located below the headrest frame 63 and can support the front end of the headrest frame 63, so that the headrest frame 63 can be supported from the front and rear sides, which is more convenient when installing some structures without the limiting rib 622 and the limiting groove.

[0036] In order to press down the headrest frame 63, as Figures 1-3As shown in the figure, in this embodiment, the assembly tooling further includes a fixing plate 31 and a pressing plate 35. The fixing plate 31 is fixed on the workbench 1 by four support rods 32. The fixing plate 31 is located above the second positioning seat 5 and the first positioning seat 2. The fixing plate 31 is connected to the pressing plate 35 through a lifting mechanism. The pressing plate 35 is located below the fixing plate 31. In the above step 3), after the lifting mechanism drives the pressing plate 35 to move downward, the pressing plate 35 can simultaneously press the left end and the right end of the headrest frame 63, causing the headrest frame 63 to deform, so that the second hinge hole 632 of the hinge portion 631 of the headrest frame 63 and the first hinge hole of the hinge ear 621 of the carriage 62 are aligned coaxially. In this way, the force on the headrest frame 63 can be more uniform, and the deformation of the headrest frame 63 is also more uniform and controllable. Further, the above lifting mechanism includes a first cylinder 33. The first cylinder 33 is vertically arranged. The telescopic end 34 of the first cylinder faces downward and is fixed to the pressing plate 35. A plurality of guide pillar and guide sleeve structures are also arranged between the fixing plate 31 and the pressing plate 35. The guide sleeve 37 is fixed on the fixing plate 31. A plurality of guide sleeves 37 are arranged around the first cylinder 33. The bottom of the guide pillar 38 is fixed to the pressing plate 35. The top of the guide pillar 38 can extend out of the fixing plate 31 after passing through the guide sleeve 37. In this way, the stroke of the pressing plate 35 can be better controlled, making the assembly process more stable. Further, a first operation handle 39 for operating the first cylinder 33 is also installed on the workbench 1. In this way, it is convenient to operate, and it can limit the worker to operate the handle after placing the various components of the headrest on the assembly tooling in the operation process, providing the safety of the assembly process. In other embodiments, the above lifting mechanism can also be a screw nut structure, a multi-link structure, etc., which can drive the pressing plate 35 to move up and down.

[0037] In this embodiment, in order to prevent the pressing plate 35 from damaging the structure of the headrest frame 63, two pressing blocks 36 for pressing the left end and the right end of the headrest frame 63 are installed at the bottom of the pressing plate 35 of the assembly tooling. The two pressing blocks are arranged left and right. In order to obtain a larger contact area, a laterally extending pressing groove is opened at the bottom of the pressing block 36, so that the pressing block is more matched with the curved headrest frame 63. In order to avoid the pressing block from damaging the headrest frame 63, the pressing block 36 is made of elastic rubber.

[0038] In this embodiment, to reduce the assembly difficulty of the hinge shaft 623, the assembly tooling further includes a second cylinder 4 installed on the workbench 1. The second cylinder 4 is horizontally arranged, and the telescopic end of the second cylinder 41 faces the first hinge hole of the carriage 62. In step 4), after placing the hinge shaft 623 between the second cylinder 4 and the first hinge hole, the second cylinder 4 is started. The telescopic end of the second cylinder 41 can extend towards the side where the carriage 62 is located. The telescopic end of the second cylinder 41 pushes the hinge shaft 623 to be inserted into the first hinge hole of the carriage 62 and the second hinge hole 632 of the headrest frame, completing the tight fit between the hinge shaft 623 and the first hinge hole or the second hinge hole 632. Further, to facilitate the operation of the second cylinder 4, a second operation handle for controlling the second cylinder 4 is also installed on the workbench 1. The first operation handle and the second operation handle are both located on the front side of the second cylinder 4, which not only facilitates the operation of the cylinder but also makes the structure of the assembly tooling more compact.

[0039] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A method for assembling a headrest, characterized in that: The headrest includes a support frame (61), a sliding frame (62) and a headrest frame (63). The sliding frame (62) is installed on the support frame (61). A buckle structure is provided between the support frame (61) and the sliding frame (62) so that the sliding frame (62) can be fixed at different positions on the support frame (61). Two hinge ears (621) are provided on the sliding frame (62) and protrude upward and are arranged left and right. First hinge holes extending left and right are formed in both hinge ears (621). A plurality of limiting ridges (622) are also provided on the sliding frame (62) and are arranged front and back. The plurality of limiting ridges (622) are located between the two hinge ears (621). The front and rear ends of the headrest frame (63) are bent downward, and a hinge portion (631) is provided on the headrest frame (63). A second hinge hole (632) extending in the left and right directions is formed in the hinge portion (631). One end of the hinge portion (631) opposite to the headrest frame (63) is a limiting end, and the limiting end is arc-shaped. A plurality of limiting grooves are formed in the limiting end and are arranged front and back. The limiting grooves are matched with the limiting ridges (622) protruding on the sliding frame (62). The specific steps for assembling the headrest are as follows: Step 1) Install the sliding frame (62) on the support frame (61), and then fix the support frame (61) and make the hinge ears (621) of the sliding frame (62) vertically upward; wherein, the sliding frame (62) is moved to the rear end of the support frame (61). Step 2) Insert the hinge portion (631) of the headrest frame (63) between the two hinge ears (621) of the sliding frame (62). The limiting ridges (622) on the sliding frame (62) are inserted into the limiting grooves on the hinge portion (631) of the headrest frame (63), and the front end and the rear end of the headrest frame (63) are restricted to prevent the headrest frame (63) from moving back and forth and swinging left and right. Step 3) Press down the left and right ends of the headrest frame (63) simultaneously to deform the headrest frame (63), and the deformed headrest frame (63) makes the second hinge hole (632) of the hinge portion (631) of the headrest frame (63) and the first hinge hole of the hinge ear (621) of the sliding frame (62) concentric. Step 4) Insert a hinge shaft into the first hinge hole of the sliding frame (62) and the second hinge hole (632) of the headrest frame (63) from the side of the sliding frame (62) to complete the hinge connection between the headrest frame (63) and the sliding frame (62); wherein, the hinge shaft is in a tight fit with the first hinge hole. Step 5) Cancel the pressure applied to the headrest frame (63) to make the headrest frame (63) recover by itself.

2. The method for assembling a headrest according to claim 1, wherein: In the said Step 1), the way to fix the support frame (61) is as follows: A first positioning seat (2) is fixed on the workbench (1). A positioning groove (21) matching the support frame (61) is provided at the top of the first positioning seat (2). The support frame (61) is placed in the positioning groove (21).

3. A headrest assembly method according to claim 2, characterized in that: In step 2), the method of preventing the headrest frame (63) from moving forward and backward and swinging left and right is as follows: A second positioning seat (5) is provided at the rear of the headrest frame (63), and two third positioning seats (22) are provided at the front of the headrest frame (63). The hinge portion (631) of the headrest frame (63) is located between the two third positioning seats (22). The rear end of the headrest frame (63) abuts against the second positioning seat (5), and the second positioning seat (5) can support the bottom of the rear end of the headrest frame (63). The front end of the headrest frame (63) abuts against the two third positioning portions, and the left and right ends of the hinge portion (631) of the headrest frame (63) respectively abut against two hinge ears (621) protruding on the carriage (62).

4. A headrest assembly method according to claim 3, characterized in that: A first positioning portion (51) protrudes forward at the front end of the second positioning seat (5). In step 2), the top of the first positioning portion (51) abuts against the bottom of the rear end of the headrest frame (63), and the front end of the second positioning seat (5) abuts against the rear end of the headrest frame (63).

5. A headrest assembly method according to claim 3, characterized in that: The two third positioning seats (22) are fixed on the first positioning seat (2), and the two third positioning seats (22) are located on both sides of the hinge seat of the headrest frame (63).

6. The method for assembling a headrest according to claim 2, wherein: In step 3), the method of pressing down the headrest frame (63) is as follows: A pressing plate (35) capable of lifting is provided on the workbench (1). The pressing plate (35) is located above the headrest frame (63). By moving the pressing plate (35) up and down, the pressing down and releasing of the headrest frame (63) are completed.

7. A headrest assembly method according to claim 6, characterized in that: A first air cylinder (33) is installed on the workbench (1), and the telescopic end of the first air cylinder (33) is connected to the pressing plate (35).

8. A headrest assembly method according to claim 7, characterized in that: A first operation handle (39) for controlling the first air cylinder (33) is installed on the workbench (1).

9. A headrest assembly method according to claim 2, characterized in that: In step 4), the method of inserting the hinge shaft (623) is as follows: A second air cylinder (4) is installed on the workbench (1). The second air cylinder (4) is located on the left or right side of the first positioning seat (2), and the telescopic end of the second air cylinder (4) points to the first hinge hole of the carriage (62). When installing the hinge shaft (623), the hinge shaft (623) needs to be placed between the first hinge hole and the second air cylinder (4) first, and then the second air cylinder (4) is started to make the telescopic end of the second air cylinder (4) insert the hinge shaft (623) into the first hinge hole of the carriage (62) and the second hinge hole (632) of the headrest frame (63).

10. A method for assembling a headrest according to claim 9, characterized in that: A second operation handle (42) for controlling the second air cylinder (4) is installed on the workbench (1).

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