A seat cushion fixed-point cable covering forming process

Abstract

The present application relates to a kind of seat cushion fixed-point wire covering forming processes, comprising: S1: prefabricated seat plate;Front positioning hole and rear positioning hole are set apart and set up on the back of seat plate;S2: preparation positioning nail and pull rope;Positioning nail is divided into independent positioning nail and binding positioning nail;Binding positioning nail is fixedly connected at the both ends of pull rope;And independent positioning nail is separately taken;S3: prefabricated seat cover;The part of pull rope exposed to seat cover forms exposed section;S4: seat cover covering is fixed;With seat cover, seat cotton, seat plate is integrally covered, after covering, pull the two heads exposed to pull rope, cross the exposed section of pull rope and be pulled tight, and corresponding binding positioning nail is inserted into the nearest rear positioning hole along the direction of each stretch of exposed section;S5: seat cover reinforcing positioning;Independent positioning nail is inserted into front positioning hole one by one, and the nail cap of independent positioning nail will the nearest seat cover edge be pressed on the back of seat plate.The cost of the fixed-point process method is lower than that of gun nail insertion method, and the process of worker nail seat cover fabric is avoided.

Description

Technical Field

[0001] This invention relates to the field of seat processing, and in particular to a fixed-point wire drawing and wrapping molding process for seat cushions. Background Technology

[0002] In recent years, the demand for office chairs has been steadily increasing. After years of development, my country's office chair industry has become a major artery in the global office chair supply chain. Therefore, the requirements for production efficiency and quality are increasingly higher, and naturally, the requirements for seat cushion processing technology are also becoming more stringent. Seat cushions are mainly composed of sponge wrapped around a wooden board, and a seat cover wrapped around the sponge. In current manufacturing processes, the seat cushion is mostly formed by manual nailing. Manual nailing involves the following steps: First, spray a layer of glue onto the upper surface of the wooden board and the lower surface of the cut sponge, then glue the sponge to wrap the upper surface and sides of the wooden board; Second, place the seat cover on top of the seat cushion, distinguish the front and back directions of the seat cover and seat cushion, fold the seat cover inwards, and use both hands to open the front two corners of the seat cover to the left and right, keeping the front two corners close to the forward curve of the seat cushion, then flip the seat cover downwards and place it on top of the seat cushion; then use both hands to open the back two corners of the seat cover to the left and right, keeping the back two corners close to the seat cushion, then flip the seat cover downwards and place it on top of the seat cushion. Because the seat cover is still in a loose state at this time, it is relatively easy to put the seat foam on, and its covering shape is not yet completely determined; the third step: place the seat face up on the workbench, first tighten the fabric at the opposite corners of the seat cover, then use nail gun to fix the fabric at the opposite corners of the seat cover to the wooden board, then tighten the fabric around the seat cover, and continuously drive nail guns in clockwise or counterclockwise direction to fix the edge of the seat cover to the wooden board.

[0003] During the production of seat cushions, the tightness of the seat cover covering the wooden board and the relative position of the seat cover to the board are difficult to control due to limitations in workers' experience and skill level. Uneven manual tension on the seat cover results in varying tension after nailing, often leading to unevenness or wavy patterns on the seat surface, severely impacting the appearance of the covering. Therefore, the seat cushion covering process undoubtedly presents challenges due to its high operational requirements and reliance on personal experience, significantly affecting production efficiency.

[0004] As an improvement, a seat cover and cushion for office chairs have been provided. The cover includes a cover surface and a fabric band around its perimeter. A drawstring is threaded inside the fabric band. The fabric band has multiple adjustment openings. The fabric band gathers around the back of the seat cushion, and when tightened, the drawstring secures the fabric band to the seat cushion. Only the end of the drawstring is nailed in place. Disassembly and assembly are simple, requiring only adjustment of the drawstring through the multiple adjustment openings, making disassembly and assembly time-saving and labor-saving, and easy to wash. However, each time the seat is secured, the length of the drawstring needs to be readjusted, and knots or other methods must be used to fix the drawstring and ensure the seat surface is flat.

[0005] In addition, the cloth cover has too many adjustment ports, and the result of each adjustment is not necessarily the same. It requires multiple adjustments from different ports, and the effect achieved by each adjustment is different. The adjustment is cumbersome, and over time it will cause the sponge seat cushion to deform in different directions, affecting the user experience. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a seat cushion fixed-point pull-cord wrapping molding process. First, the seat cover is wrapped around the seat foam. By tightening the pull cord, the independent positioning pin at the end of the pull cord engages with the positioning hole, fixing the seat cover and seat foam to the seat plate. This eliminates the step of nailing the seat cover with a nail gun, making installation more convenient, while also reducing production costs and improving production efficiency.

[0007] The technical solution of this invention is implemented as follows:

[0008] A seat cushion fixed-point stitching and molding process includes:

[0009] S1: Precast seat plate; front positioning holes spaced apart are opened at the front of the back of the seat plate, and at least one pair of rear positioning holes spaced apart on the left and right are opened at the rear of the back of the seat plate. Both the front positioning holes and the rear positioning holes are located within the edge of the seat plate.

[0010] S2: Prepare positioning pins and pull ropes; positioning pins are divided into independent positioning pins and binding positioning pins; determine the length of the pull rope according to the perimeter of the seat cover, and fix the binding positioning pins at both ends of the pull rope for insertion and mating with the rear positioning holes; while independent positioning pins are taken out separately and are not bound to the pull rope;

[0011] S3: Prefabricated seat cover; The pull cord is sewn into the edge of the seat cover, with one end of the pull cord protruding from the middle of the back side of the seat cover on each side, forming an exposed section of the pull cord.

[0012] S4: Seat cover covering and fixing; combine the seat foam and the seat plate, and use the seat cover to cover the seat foam and the seat plate as a whole. After covering, pull the two exposed ends of the pull rope to make the edge of the seat cover tuck into the position inside the back edge of the seat plate. At the same time, cross and tighten the exposed sections of the pull rope to shrink the edge of the seat cover, and insert the corresponding binding positioning pins into the nearest rear positioning hole in the direction of each of the exposed sections' stretching.

[0013] S5: Seat cover reinforcement positioning; Insert the independent positioning pins one by one into the front positioning holes, and the pin heads of the independent positioning pins will press the nearest edge of the seat cover against the back of the seat plate.

[0014] Preferably, in step S2, the positioning pin is made of plastic or metal. When the positioning pin is made of plastic, the two ends of the pull rope are integrated into the positioning pin by injection molding. This design makes the positioning pin material cost lower and the manufacturing process simpler. When the positioning pin is made of metal, the two ends of the pull rope are each tied to the positioning pin. This design makes the positioning pin easy to replace and install.

[0015] Preferably, in step S4, the combination of seat foam and seat plate means: the seat foam is glued to the front of the seat plate, so that the relative position of the seat foam and the seat plate is fixed; and the seat foam is not easy to detach from the seat plate.

[0016] Preferably, in step S4, the combination of the seat cushion and the seat plate means that the back of the seat cushion has an upwardly protruding annular edge along its own edge, and a receiving cavity for accommodating the seat plate is formed between the back of the seat cushion and the annular protruding edge. The seat plate is placed into the receiving cavity, that is, the seat plate and the seat cushion are combined together. While keeping the seat cushion and the seat plate fixed, it also facilitates the disassembly and cleaning of the seat cushion.

[0017] Preferably, the positioning pin includes a pin head and a pin post, and the surface of the pin post is provided with texture to increase friction, so that the positioning pin can be firmly locked in the positioning hole.

[0018] Preferably, in step S4, the binding positioning pin and the rear positioning hole are interference fits; in step S5, the independent positioning pin and the front positioning hole are also interference fits. The interference fit design ensures that the positioning pin does not fall out of the positioning hole.

[0019] Preferably, in step S1, at least two front positioning holes are symmetrically arranged on the back of the seat plate, and the distance between each front positioning hole and the edge of the seat plate is 4-8cm; the distance between each rear positioning hole and the edge of the seat plate is also 4-8cm.

[0020] Preferably, in step S3, the pull cord has notches on the left and right sides at the center of the rear edge of the seat cover, and the exposed section is led out from the notches, with a distance of 10-20mm between the two notches.

[0021] Preferably, in step S2, determining the length of the pull cord based on the perimeter of the seat cover means that, in the untightened state, the length of the pull cord is 10-25cm longer than the perimeter of the seat cover.

[0022] The principle and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0023] This invention provides a fixed-point stitching molding process for seat cushions. By inserting independent positioning pins and binding positioning pins into positioning holes, the seat cover is fixed in place, completely covering the seat cushion. This avoids the need to nail the seat cover in place with a nail gun and facilitates disassembly and cleaning. Furthermore, the fixed-point process is less expensive than the nail gun method and eliminates the need for workers to stitch the seat cover fabric, saving workers' time and significantly increasing production efficiency. The simple operation process also eliminates installation quality problems caused by differences in workers' assembly skills, effectively ensuring installation quality. Attached Figure Description

[0024] Figure 1 Flowchart of the process for fixed-point stitching and wrapping of seat cushions;

[0025] Figure 2 A diagram illustrating the binding of the positioning pin and pull cord;

[0026] Figure 3 This is a structural schematic diagram of the base plate;

[0027] Figure 4 A schematic diagram of a seat cover integrated with a pull cord;

[0028] Figure 5 This is a diagram showing a seat cushion without individual positioning pins installed.

[0029] Figure 6 This is a schematic diagram of the seat cushion structure;

[0030] Figure 7 A schematic diagram of the shape of an independent positioning pin;

[0031] Figure 8 This is a magnified view of a section of the seat cushion.

[0032] Figure 9 A cross-sectional view showing the pull cord inside the edge of the seat cover;

[0033] Figure 10 This is a schematic diagram of the pile nail and pull rope in Example 2;

[0034] The labels on the attached drawings are as follows: 1-binding positioning nail, 2-base plate, 21-front positioning hole, 22-rear positioning hole, 3-base sleeve, 31-pull rope, 32-notch, 33-cavity, 311-exposed section, 4-base foam, 41-accommodating cavity, 5-independent positioning nail, 6-nail head, 7-nail post, 8-pile nail. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0037] This invention has multiple implementation methods, the specific implementation methods are as follows:

[0038] Example 1: This invention provides a seat cushion fixed-point stitching and wrapping molding process, including the following steps:

[0039] S1: Precast seat plate 2; as shown in the example Figure 3 As shown, front positioning holes 21 are spaced apart on the front part of the back of the seat plate 2, and the number of front positioning holes 21 is one or more; at least one pair of rear positioning holes 22 spaced apart on the left and right sides are opened on the rear part of the back of the seat plate 2, and the front positioning holes 21 and rear positioning holes 22 are both located within the edge of the seat plate 2; at least two front positioning holes are symmetrically arranged on the back of the seat plate, and the distance between each front positioning hole and the edge of the seat plate is 4-8cm; the distance between each rear positioning hole and the edge of the seat plate is also 4-8cm; so that at least three fixing points are formed on the seat plate 2 in reasonable positions.

[0040] Specifically, the positioning holes on the seat plate 2 can have two effects: the positioning holes penetrate the seat plate 2 and the positioning holes do not penetrate the seat plate 2. When the positioning holes penetrate the seat plate 2, the front and back of the seat plate 2 are the same, which means that the front and back of the seat plate 2 do not need to be distinguished during installation. However, long-term use will cause the seat cushion 4 to sink into the positioning holes, resulting in unevenness of the seat cushion 4. When the positioning holes do not penetrate the seat plate 2, the front and back can be directly determined by whether there is an opening, and the flatness of the seat cushion 4 at the sitting end can be guaranteed. In summary, in this embodiment, the positioning holes on the seat plate 2 do not penetrate the seat plate 2.

[0041] S2: Prepare positioning pins and pull ropes 31; as shown in the example. Figure 2 and Figure 7 As shown, the length of the pull rope 31 can be designed from the edge length of the seat cover 3. The length of the pull rope 31 is slightly longer than the edge of the seat cover 3. The part of the pull rope 31 that protrudes from the seat cover 3 forms an exposed section 311. The length of the exposed section 311 of the pull rope 31 is about 10-25cm. The exposed section 311 of the pull rope 31 makes it easier for the staff to pull the pull rope 31 during installation, making the installation more convenient.

[0042] The positioning pins are divided into independent positioning pins 5 and binding positioning pins 1. The binding positioning pin 1 is fixed to the pull rope 31, while the independent positioning pin 5 can be removed separately and is not bound to the pull rope 31. Both types of positioning pins include a pin head and a pin post. The outer diameter of the positioning pin is slightly larger than the outer diameter of the positioning hole. The surface of the pin post has textures to increase friction, which allows the positioning pin to be firmly locked in the positioning hole, so as to form an interference fit between the positioning pin and the positioning hole. The positioning pins can be made of plastic or metal. When the positioning pin is made of plastic, the material cost is lower and the manufacturing process is simpler. The two ends of the pull rope 31 are integrated into the binding positioning pin 1 through injection molding, making the connection between the pull rope 31 and the binding positioning pin 1 more stable. When the positioning pin is made of metal, the positioning pin has higher strength and hardness. In this case, the two ends of the pull rope 31 are each tied to the binding positioning pin 1. That is to say, when the positioning pin is damaged, the metal positioning pin is easy to disassemble, replace and install.

[0043] The depth of the positioning hole must be greater than the length of the positioning pin. If the depth of the positioning hole is less than the depth of the positioning pin, the positioning pin will not be installed securely and will fall off. There are multiple positioning holes on the plate, which are equivalent to multiple positioning points. By fixing the seat sleeve 3 to the seat plate 2 from various directions, the seat sleeve 3 can achieve the best fixing effect.

[0044] S3: Prefabricated seat cover 3; such as Figure 4 As shown, the pull cord 31 is sewn into the edge of the seat cover 3, so that the pull cord 31 is located in the cavity 33 of the edge of the seat cover 3, and one end of the pull cord 31 protrudes from the middle of the back side of the seat cover 3 on each side. There is a notch 32 between the two pull cords 31. The necessity of the notch 32 is mainly reflected in the user's use. When the notch 32 is not provided, the pull cord 31 passes through the two small holes on the edge of the seat cover 3. When the user uses the seat cushion, the seat cover 3 moves due to the person sitting on the seat cushion, which will cause the small holes through which the pull cord 31 passes to enlarge, causing the pull cord 31 to loosen and the edge of the seat cover 3 to... Cracks appear at the edge, and the edge of the seat cover 3 becomes loose, eventually rendering the seat cover 3 unusable. In other words, the setting of the notch 32 is necessary. The setting range of the notch 32 should be less than the distance between the two rear positioning holes 22. The spacing of the notches 32 is about 10-20mm. When the notch 32 is too small, the force on the pull rope 31 is concentrated at both ends of the pull rope 31, and the force at the notch 32 is greater. The pulling force will be concentrated in the smaller area of ​​the notch 32, which will cause the seat cover 3 to be torn at the notch 32, causing the seat cover 3 to fall off the seat plate 2.

[0045] S4: Seat cover 3 covers and secures the seat; as shown Figure 5-8As shown, the seat foam 4 and the seat plate 2 can be combined in two ways: The first way is to glue the seat foam 4 to the front of the seat plate 2, fixing their relative positions and ensuring a tight fit. This method makes the connection between the seat foam 4 and the seat plate 2 more secure and less prone to detachment. The second way is to provide an upward-protruding annular edge along its own edge on the back of the seat foam 4. This creates a receiving cavity 41 between the back of the seat foam 4 and the annular edge, accommodating the seat plate 2. The seat plate 2 is placed inside the receiving cavity 41, so that it is surrounded by the receiving cavity 41, and the annular convex edge limits the seat plate 2 to prevent it from falling out of the receiving cavity 41. In this way, during the production process, the seat plate 2 only needs to be pressed into the receiving cavity 41 of the seat foam 4. When cleaning and replacement are required, the annular convex edge of the seat foam 4 can be pulled to separate the seat plate 2 from the seat foam 4. This design not only ensures the fixing effect of the seat plate 2 and the seat foam 4, but also makes the replacement and cleaning of the seat foam 4 more convenient.

[0046] Specifically, the process of covering the seat cover 3 is as follows: The seat cover 3 is used to cover the seat foam 4 and the seat plate 2 as a whole. After covering, the two exposed ends of the pull rope 31 are pulled so that the edge of the seat cover 3 is tucked into the back edge of the seat plate 2. At the same time, the exposed sections 311 of the pull rope 31 are crisscrossed and tightened. The binding positioning pin 1 is inserted into the positioning hole, so that the edge of the seat cover 3 retracts. The corresponding binding positioning pin 1 is inserted into the nearest rear positioning hole 22 in the direction of the stretching of the exposed sections 311, and the binding positioning pin 1 is pressed into the seat cover 3. The upper pull rope 31 will press the lower pull rope 31 into place to prevent the lower pull rope 31 from springing open. The edge of the seat cover 3 and the binding positioning pin 1 are relatively fixed to the seat plate 2, forming a two-way restriction on the pull rope 31 to prevent the pull rope 31 from springing open. This allows the crisscrossed and tightened pull rope 31 to better fix the seat cover 3 to the seat plate 2.

[0047] S5: Seat cover 3 reinforces positioning; such as Figure 9 As shown, since the seat cover 3 will pop off from the front end when only the binding positioning pin 1 is in use, the front positioning hole 21 is needed to fix it. The independent positioning pins 5 are inserted into the front positioning hole 21 one by one. The pin head 6 of the independent positioning pin 5 presses the nearest edge of the seat cover 3 against the back of the seat plate 2, making the seat cover 3 more secure and preventing the seat cover 1 from moving back and forth.

[0048] Example 2: As Figure 10As shown, the difference between this embodiment and embodiment 1 is that a stake 8 is provided at the lower end of the seat plate 2. The stake 8 is nailed to the edge of the notch 32, and its fixing function is similar to that of the independent positioning nail 5. The difference is that the stake 8 is located in the middle of the exposed pull rope 31 to reduce the probability of damage to the notch 32 when the pull rope 31 is pulled. The stake 8 can also make the positioning nail more secure through the combination connection of the pull rope. The specific operation method is as follows: after the pull rope 31 is tightened and wrapped around the stake 8 at least once, the positioning nail is then inserted into the positioning hole where the pull rope 31 intersects. Through the action of the stake 8, the pull rope 31 can be fixed more firmly. The stake 8 and the original two binding positioning nails 1 form three downward force points, making the pull rope 31 less likely to spring back.

[0049] In addition, the stake 8 can also serve as a winding core; that is, by increasing the number of turns of the pull rope 31 around the stake 8, the pull rope 31 can be tightened, and then the binding positioning nail 1 at the end of the pull rope 31 can be inserted into the rear positioning hole 22. Even if the length of the pull rope 31 is too long due to production and operation errors, the presence of the stake 8 can still achieve the same fixing effect between the seat sleeve 3 and the seat plate 2 as in Example 1.

[0050] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A seat cushion fixed-point stitching and wrapping molding process, characterized in that: The process includes the following steps: S1: Precast seat plate (2); a front positioning hole (21) is opened at intervals on the front part of the back of the seat plate (2), and at least one pair of rear positioning holes (22) are opened at intervals on the left and right sides on the rear part of the back of the seat plate (2). The front positioning hole (21) and the rear positioning hole (22) are both located within the edge of the seat plate (2). S2: Prepare positioning pins and pull ropes (31); the positioning pins include a pin head (6) and a pin post (7), and the surface of the pin post (7) is provided with textures to increase friction; the positioning pins are divided into independent positioning pins (5) and binding positioning pins (1); the length of the pull rope (31) is determined according to the perimeter length of the seat sleeve (3), and binding positioning pins (1) for insertion and mating with the rear positioning hole (22) are fixedly connected at both ends of the pull rope (31); while the independent positioning pins (5) are taken out separately and are not bound to the pull rope (31); S3: Prefabricated seat cover (3); The pull cord (31) is sewn into the edge of the seat cover (3), and one end of the pull cord (31) is exposed on the left and right sides of the middle of the back side of the seat cover (3), and the part of the pull cord (31) exposed on the seat cover (3) forms the exposed section (311). S4: The seat cover (3) is used to cover and fix the seat. The back of the seat foam (4) has an upward-protruding annular edge along its own edge. The back of the seat foam (4) and the annular edge form a receiving cavity (41) for accommodating the seat plate (2). The seat plate (2) is placed into the receiving cavity (41), that is, the seat plate (2) and the seat foam (4) are combined together. The seat cover (3) is used to cover the seat foam (4) and the seat plate (2) as a whole. After covering, the two exposed ends of the pull rope (31) are pulled so that the edge of the seat cover (3) is tucked into the position inside the back edge of the seat plate (2). At the same time, the exposed section (311) of the pull rope (31) is pulled taut in a crosswise manner so that the edge of the seat cover (3) is contracted. The corresponding binding positioning pin (1) is inserted into the nearest rear positioning hole (22) in the direction of the stretching of the exposed section (311). The binding positioning pin (1) and the rear positioning hole (22) are interference fit. S5: Seat cover (3) reinforces positioning; insert the independent positioning pins (5) one by one into the front positioning hole (21) so that the pin head (6) of the independent positioning pin (5) presses the edge of the nearest seat cover (3) onto the back of the seat plate (2); the independent positioning pin (5) and the front positioning hole (21) are interference fit.

2. The seat cushion fixed-point drawing and wrapping molding process according to claim 1, characterized in that: In step S2, the positioning pin is made of plastic or metal. When the positioning pin is made of plastic, the two ends of the pull rope (31) are integrated into the positioning pin (1) by injection molding. When the positioning pin is made of metal, the two ends of the pull rope (31) are each tied to the positioning pin.

3. The seat cushion fixed-point drawing and wrapping molding process according to claim 1, characterized in that: In step S1, at least two front positioning holes (21) are symmetrically arranged on the back of the seat plate (2), and the distance between each front positioning hole (21) and the edge of the seat plate (2) is 4-8cm; the distance between each rear positioning hole (22) and the edge of the seat plate (2) is also 4-8cm.

4. The seat cushion fixed-point drawing and wrapping molding process according to claim 1, characterized in that: In step S3, the pull rope (31) has notches (32) on the left and right sides of the middle of the rear edge of the seat cover (3), and the exposed section (311) is led out from the notches (32). The distance between the two notches (32) is 10-20mm.

5. The seat cushion fixed-point wire drawing and wrapping molding process according to claim 1, characterized in that: In step S2, determining the length of the pull rope (31) based on the perimeter of the seat cover (3) means that, in the untightened state, the length of the pull rope (31) is 10-25cm longer than the perimeter of the seat cover (3).

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