Seatback rod and chassis assembly structure

Abstract

The present invention relates to a seatback rod and chassis assembly structure, comprising a chassis, a seatback rod, an elastic device, a connecting rod set, and a limiting block. The chassis has a top surface and a bottom surface, along with a set of connecting slot holes. These slot holes have two side walls and an opening at the rear. The front end of the bottom portion of the seatback rod is provided with a coupling base, which has two laterally opposed side walls. Additionally, a first through hole is provided at a position corresponding to the set of connecting slot holes. The elastic device possesses elasticity and is positioned to abut against the bottom surface of the coupling base. The connecting rod set includes an end portion with a diameter larger than the width of the connecting slot holes. The lower part of this end portion passes through the set of connecting slot holes, the first through hole, and the elastic device for assembly. Furthermore, the limiting block is arranged on the chassis at a position corresponding to the set of connecting slot holes. By this configuration, the present invention provides improved assembly convenience and efficiency.

Description

Technical Field

[0001] The present invention relates to a seat back rod and chassis combination structure, mainly to a structure that can provide better assembly convenience. Prior Art

[0002] In order to improve the comfort of lying back, a conventional chair is connected to the back frame of the chair back with an elastic device, so that the elastic device can be compressed when the chair back is reclined, and the elastic device provides elastic comfort.

[0003] Figures 8-10 illustrate the combined structure of a conventional backrest and chassis. Figure 8 shows an inverted view, featuring a chassis 1', a backrest 2', an elastic device 3', and a pivot rod 4'. The chassis 1' is fixedly mounted below the seat (not shown) and has two downwardly protruding pivot plates 11' with pivot holes 111' defined in each plate. A combination rod 12' is also positioned downwardly at the rear. The backrest 2' is connected to the backrest cushion (not shown). A pivot portion 21' is positioned at its bottom end, corresponding to the position of the pivot plates 11', and can be positioned between the two pivot plates 11'. The pivot portion 21' is provided with a pivot hole 211'. This allows the pivot portion 21' to be positioned between the two pivot plates 11' and pivotally connected by the pivot rod 4', which penetrates the pivot holes 111' and 211'. The backrest 2' is provided with an elongated slot 22' that can be inserted into the assembly rod 12'. The elastic device 3' includes a spring 31', a socket 32', and a pressure seat 33'. The spring 31' is disposed within the socket 32' and the pressure seat 33'. The socket 32' is further provided with a connection hole 321' that can be assembled with the assembly rod 12', allowing the assembly rod 12' to be inserted through the slot 22' of the backrest 2', the pressure seat 33', the spring 31', the socket 32', and the connection hole 321'. When the user reclines the backrest, the backrest 2' pivots rearward relative to the chassis 1', using the pivot 4' as the axis. The bottom surface A of the front end of the backrest 2' presses against the pressure seat 33', compressing the spring 31' and generating a restoring elastic force.

[0004] However, when assembling the back bar 2', the consumer must insert the slot 22' of the back bar 2' into the combination bar 12' and the elastic device 3', and also align the pivot hole 211' of the pivot portion 21' with the pivot holes 111' of the two pivot plates 11' before inserting the pivot bar 4', which is inconvenient for the consumer to assemble by himself.

[0005] As shown in Figure 9, when the back bar 2' is not reclined, the horizontal distance D1 between position A of the back bar 2' and the pivot bar 4' is maintained. As shown in Figure 10, when the back bar 2' is reclined, its front end can be deflected downward, using the pivot bar 4' as a pivot, so that the horizontal distance D2 between position A of the back bar 2' and the pivot bar 4' is maintained. D2 is greater than D1 and forms an inclination angle Ɵ with respect to the bottom wall 1' to compress the spring 31'.

[0006] However, since the back bar 2' rotates around the fixed axis position of the pivot 4', the further the front end A of the back bar 2' moves downward, the greater the inclination angle of the A position with respect to the chassis 1'. This makes it difficult for the inclination position to press the pressing seat 33' obliquely, and the force must be increased to compress the spring 31'. At the same time, the pivot 4' will also increase the pressure it can withstand. Therefore, the compression force of the spring 31' varies when the back bar 2' reclines from a small angle to a large angle, which will cause discomfort and the spring 31' will be difficult to compress when the reclining angle is large. Summary of the Invention

[0007] The object of the present invention is to provide a structure that can improve assembly convenience and lying comfort.

[0008] The present invention includes a chassis, a back rod, an elastic device, and a group of connecting rods. The chassis has a top surface and a bottom surface, and is provided with a connecting slot extending from the center of the rear end toward the front. The connecting slot has two side walls and an opening at the rear. A connecting seat is provided at the front end of the bottom of the back rod, and the connecting seat has two left and right opposite side walls. A first through-hole penetrating the connecting seat is provided at the position corresponding to the connecting slot. The elastic device is elastic and abuts against the bottom surface of the connecting seat. The connecting rod has an end with a diameter greater than the width of the connecting slot, and the lower part of the end can be inserted into the connecting slot, the first through-hole, and the elastic device. The limit block is provided at a position above the chassis corresponding to the connecting slot, and after the back rod, the elastic device, and the connecting rod are assembled, the connecting rod can be inserted into the connecting slot from the rear to the front to be combined with the chassis, and the limit block can abut against the rear position of the end of the connecting rod.

[0009] In one embodiment of the present invention, the limit block has restorative elasticity and is disposed on the top surface of the chassis. An elastic portion is disposed corresponding to the position of the assembly slot, and a hook portion is disposed behind the elastic portion to abut against the rear end of the assembly rod.

[0010] In one embodiment of the present invention, the hook portion has a guide slope at the rear and a stop surface at the front that can abut against the end of the connecting rod group.

[0011] In one embodiment of the present invention, a groove in the left and right directions is provided on the bottom surface of the chassis in front of the assembly slot; and an engaging column in the left and right directions that can be embedded in the groove is provided on the upper front side of the side wall of the joint seat.

[0012] In one embodiment of the present invention, the groove is approximately semicircular, the embedded post is approximately cylindrical, and a portion of the embedded post can be embedded in the groove.

[0013] In one embodiment of the present invention, a sleeve is sleeved on the outer edge of the engaging post, which can rotate relative to the engaging post and can contact the surface of the groove.

[0014] In one embodiment of the present invention, the top surface of the chassis is provided with curved flanges on both sides of the connecting slots, which can abut against the bottom surfaces of the ends of the connecting rods.

[0015] In one embodiment of the present invention, two blocking pieces are protruding downward from the bottom surface of the chassis, and the side walls of the engaging seat are assembled on the outside of the two blocking pieces.

[0016] In one embodiment of the present invention, the rear end of the top of the side wall is provided with an edge which can abut against the rear end of the chassis and simultaneously position the embedded column behind the groove.

[0017] In one embodiment of the present invention, the elastic device includes a spring, a pressure seat, and a connecting seat. The spring is disposed within the pressure seat and the connecting seat, and the pressure seat abuts against the bottom surface of the connecting seat. A contact portion is disposed below the end of the connecting rod, which abuts against the side wall of the connecting slot to prevent the connecting rod from rotating. A coupling portion is disposed below the contact portion. The pressure seat has a top wall and an annular wall, with a first coupling groove in the center thereof that fits over the top of the spring. A second through-hole is disposed at the position corresponding to the first through-hole of the backing rod, through which the connecting rod is inserted. The connecting seat has a bottom wall and an annular wall, with a second coupling groove in the center thereof that fits over the bottom of the spring and the annular wall of the pressure seat. A coupling hole is disposed in the center of the bottom wall, which is adapted to engage with the coupling portion of the connecting rod.

[0018] The present invention allows the back bar, the elastic device, and the connecting rod to be assembled together before shipment. When unpacking and assembling, the consumer can align the connecting rod with the connecting slot and move the back bar's joint seat toward the chassis. When the end of the connecting rod presses against the hook guide slope of the stop block, the hook deflects upward, allowing the connecting rod to continue moving forward. When the connecting rod moves below the elastic portion, the hook rebounds, positioning the stop surface behind the end of the connecting rod, thereby preventing the connecting rod, the elastic device, and the back bar from detaching from the chassis. Thus, the present invention allows consumers to assemble the back bar and chassis simply by inserting and inserting the connecting rod, simplifying assembly.

[0019] The present invention allows the bottom surface of the engaging seat to press the pressing seat of the elastic device downward and compress the spring to generate compression elasticity when the back rod moves backward. At this time, the bottom surface of the end of the connecting rod can be correspondingly offset along the curved flange and the engaging column can be correspondingly offset downward. The engaging column and the sleeve can be displaced to partially or completely disengage from the groove. Therefore, the engaging column of the present invention is not a fixed rotating shaft, and the bottom surface of the engaging seat can still be offset and stably attached to the top wall of the pressing seat when the back rod leans back, so that the pressing seat can easily bear the force to compress the spring, and can provide the back rod leaning back process with a linear and smooth compression of the spring for better comfort. Simple diagram description

[0020] FIG1 is an exploded top view of the seat backrest and chassis assembly structure of the present invention.

[0021] FIG2 is an exploded view of the backrest and chassis assembly structure of the chair of the present invention as viewed from above.

[0022] FIG3 is a top view of the backrest, elastic device, connecting rod assembly and chassis assembly of the chair of the present invention.

[0023] FIG4 is a schematic diagram showing the assembly of the backrest, elastic device, connecting rod and chassis of the chair of the present invention when viewed from the rear.

[0024] FIG5 is a diagram showing the assembly of the backrest and chassis of the chair of the present invention.

[0025] FIG6 is a cross-sectional view of the backrest and chassis assembly of the chair of the present invention.

[0026] FIG. 7 is a schematic diagram showing the rearward displacement of the backrest of the chair of the present invention.

[0027] Figure 8 is an exploded view of the backrest and chassis of a conventional seat.

[0028] FIG9 is a cross-sectional view of the backrest and chassis assembly of a conventional seat.

[0029] FIG10 is a schematic diagram of a reclining compression spring for a conventional seat backrest. Implementation Method

[0030] Referring to Figures 1-6, the present invention comprises a chassis 1, a backrest 2, an elastic device 3, a set of connecting rods 4, and a stopper 5. The chassis 1 is assembled beneath the seat of a chair (not shown) and comprises a top surface 11, a bottom surface 12, and a connecting slot 13 extending from the center of the rear end toward the front. The connecting slot 13 has two parallel sidewalls 131 and an opening 132 at the rear. Engaging holes 14 are provided on the left and right sides of the connecting slot 13. The bottom surface 12 is provided with left and right grooves 15 corresponding to the front of the connecting slot 13. The grooves 15 are approximately semicircular in shape. Two downwardly projecting stoppers 16 are provided on the bottom surface 12, corresponding to the front of the grooves 15. Curved flanges 17 are provided on the top surface 11, corresponding to the sides of the connecting slot 13.

[0031] A coupling seat 21 is provided at the front end of the bottom of the back bar 2. The coupling seat 21 has two opposing sidewalls 22 that can be assembled with the outer sides of the two blocking plates 16. A cylindrical engaging post 23 is provided on the upper front side of the sidewall 22, which can partially fit into the groove 15 in the left and right directions. A sleeve 231 is sleeved on the outer edge of the engaging post, which can rotate relative to the engaging post 23 and contact the surface of the groove 15. Furthermore, a rear abutment edge 24 is provided at the rear end of the top of the sidewall 22, which can abut against the rear end of the chassis 1. The sidewall 22 also has an upper abutment edge 25 that can abut against the bottom surface 12 of the chassis 1. Furthermore, a first through-hole 26 is provided, extending upward and downward through the coupling seat 21, at a position corresponding to the assembly slot 13.

[0032] The elastic device 3 includes a spring 31, a pressing seat 32, and a socket 33. The spring 31 is a compression spring. The pressing seat 32 has a top wall 321 and a ring wall 322. A first fitting groove 323 is formed in the center of the spring 31, which fits snugly into the top of the spring 31. A second through hole 324 is provided corresponding to the first through hole 26 of the back rod 2. A protruding edge 325 is provided around the periphery of the second through hole 324, which fits into the first through hole 26 and abuts against the side wall of the first through hole 26.

[0033] The socket 33 has a bottom wall 331 and an annular wall 332 , and a second fitting groove 333 in the center thereof that can fit the bottom of the spring 31 and the annular wall 322 of the pressing seat 32 . A set of connecting holes 334 is further provided in the center of the bottom wall 331 .

[0034] The connecting rod 4 has an end portion 41 having a diameter greater than the width of the connecting slot 13. The bottom surface 411 of the end portion 41 abuts against the curved flange 17 of the chassis 1. A square abutment portion 42 is provided below the end portion 41 to abut against the side wall 131 of the connecting slot 13 to prevent the connecting rod 4 from rotating. Below the abutment portion 42 is a combination portion 43 that can be inserted into the first through hole 26, the second through hole 324, the spring 31, and the connecting hole 334 of the socket 33.

[0035] The stopper 5 is elastic and is located on the top surface 11 of the chassis 1. It has an elastic portion 51 positioned corresponding to the assembly slot 13. A hook portion 52 is located behind the elastic portion 51. The hook portion 52 has a guide slope 521 at the rear and a stop surface 522 at the front. The stopper 5 also has a fitting groove 53 positioned corresponding to the curved flange 17 on the top surface 11 of the chassis 1, and a fitting hole 54 positioned corresponding to the fitting hole 14 of the chassis 1. Fitting elements 55 are inserted through the fitting holes 54 and 14 to securely connect the stopper 5 to the chassis 1. The fitting groove 53 fits over the curved flange 17, enhancing the stability of the assembly between the stopper 5 and the chassis 1.

[0036] When the present invention is shipped from the factory, as shown in Figures 3 and 4 , the back bar 2, elastic device 3, and connecting rod 4 are first assembled into one piece before being packaged. When the consumer unpacks and assembles the assembly, the connecting rod 4 is aligned with the connecting slot 13 as shown in Figures 3 to 6 , and the coupling seat 21 of the back bar 2 is moved toward the chassis 1. When the end 41 of the connecting rod 4 presses against the guide slope 521 of the hook portion 52 of the limit block 5, the hook portion 52 is deflected upward, allowing the connecting rod 4 to continue to move forward. When the connecting rod 4 moves below the elastic portion 51, the hook portion 52 rebounds, allowing the blocking surface 522 to be located behind the end 41 of the connecting rod 4, ensuring that the connecting rod 4, the elastic device 3, and the back bar 2 do not fall off the chassis 1.

[0037] Therefore, the present invention provides that consumers only need to move the back bar 2 toward the chassis 1 to assemble, and the assembly process is much simpler and faster than the traditional method.

[0038] In the above-described assembly of the present invention, the rear edge 24 of the coupling seat 21 can abut against the rear end of the chassis 1 to prevent the coupling seat 21 from moving forward. Furthermore, the engaging post 23 and the sleeve 231 can be partially embedded in the recess 15 of the chassis 1 for positioning, facilitating assembly alignment and providing greater assembly stability. Furthermore, the user can rotate the coupling seat 33 to adjust the compression force of the spring 31, thereby further securing the end 41 of the connecting rod 4 and the top wall 321 of the pressing seat 32 between the chassis 1 and the pressing seat 32, thereby enhancing assembly stability.

[0039] After assembly, the sidewall 22 of the engagement base 21 can abut against the stopper 16 of the chassis 1. This prevents the backrest 2 from shifting left or right relative to the chassis 1, thereby improving the stability of the backrest. Furthermore, the upper edge 25 of the engagement base 21 can abut against the bottom surface 12 of the chassis 1, further improving the stability of the assembly.

[0040] Referring to Figures 6 and 7 , when the backrest 2 is moved backward, the bottom surface of the engagement seat 21 presses the pressing seat 32 of the elastic device 3 downward, compressing the spring 31 and generating compression elasticity. At this point, the connecting rod 4 and the engaging post 23 can correspondingly deflect downward. The engaging post 23 and the sleeve 231 can be displaced, partially or completely disengaging from the recess 15. Therefore, the engaging post 23 of the present invention is not a fixed axis. This allows the bottom surface of the engagement seat 21 to deflect and stably contact the top wall 321 of the pressing seat 32 when the backrest 2 is tilted backward. This allows the pressing seat 32 to easily bear the force to compress the spring 31, ensuring smooth, linear compression of the spring 31 during the backward tilt of the backrest 2, resulting in greater comfort.

[0041] When the backrest 2 is not reclined, the elastic force of the spring 31 causes the bottom of the backrest 2 to deflect upward. At this time, as shown in FIG6 , the engaging post 23 and the sleeve 231 can deflect accordingly so that part of their volume engages and positions with the surface of the groove 15 , thereby stabilizing the deflection of the backrest 2 . Furthermore, the contact between the rotatable sleeve 231 and the surface of the groove 15 can reduce friction and collision noise.

[0042] Therefore, as described above, the present invention can have better assembly convenience and lying comfort effect, and the above embodiments are illustrative of the present invention and are not limiting of the present invention. Any equivalent changes made according to the spirit of the present invention should also fall within the scope of the present invention.

[0043] 1: Chassis 11: Top surface 12: Bottom surface 13: Assembly slot 131: Sidewall 132: Opening 14: Engagement hole 15: Groove 16:Block 17: curved flange 2: Back bar 21: Joint seat 22: Sidewall 23:Embedded column 231: Casing 24: Back edge 25: Upper edge 26: First through hole 3: Elastic device 31: Spring 32: Pressure seat 321: Top wall 322: Ring Wall 323: The first set of slots 324: Second through hole 325: against the edge 33: socket 331: Bottom wall 332: Ring wall 333: Second set of slots 334: Group connection hole 4: Connecting rod 41:End 411: Bottom 42: Adhesion part 43:Combination Department 5: Limit block 51: Elastic part 52: hook part 521: guide bevel 522: blocking surface 53: Fitting groove 54: Engagement hole 55:Joint element 1': Chassis 11': pivot piece 111': pivot hole 12': Combination rod 2': Back rod 21 ': pivoting portion 211': pivot hole 22': Slot 3': Elastic device 31': Spring 32': socket 321': Assembly hole 33': pressure seat 4': Pivot

Claims

1. A seat backrest and chassis assembly structure, comprising: A chassis, with a top surface, a bottom surface, and a connecting slot extending from the center of the rear end toward the front, the connecting slot having two side walls and an opening at the rear; a back rod, with a connecting seat provided at the front end of the bottom, the connecting seat having two left and right opposite side walls, and a first through hole passing through the connecting seat at the upper and lower ends at the position corresponding to the connecting slot; an elastic device, which is elastic and abuts against the bottom surface of the connecting seat; a connecting rod, with an end portion having a diameter greater than the width of the connecting slot, the lower portion of which can be inserted through the connecting slot, the first through hole, and the elastic device; a limit block, provided at a position above the chassis corresponding to the connecting slot; and after the back rod, the elastic device, and the connecting rod are assembled, the connecting rod can be inserted through the connecting slot from the back to the front and combined with the chassis, and the limit block can abut against the rear position of the end portion of the connecting rod.

2. The seat back rod and chassis assembly structure as described in claim 1, wherein the limit block has restorative elasticity and is disposed on the top surface of the chassis, an elastic portion is disposed corresponding to the position of the assembly slot, and a hook portion is disposed behind the elastic portion that can abut against the rear end of the assembly rod.

3. The seat back rod and chassis assembly structure as described in claim 2, wherein the hook portion has a guide slope at the rear and a stop surface at the front that can abut against the end of the connecting rod.

4. The seat back rod and chassis assembly structure as described in claim 1, wherein the top surface of the chassis is provided with curved flanges on both sides of the assembly slot that can abut against the bottom surface of the end of the assembly rod.

5. The seat backrest and chassis assembly structure as described in claim 1, wherein the bottom surface of the chassis is provided with a left and right groove in front of the assembly slot; and a left and right engaging column is provided on the upper front side of the side wall of the joint seat so as to be inserted into the groove.

6. The seat backrest and chassis assembly structure as described in claim 5, wherein the groove is approximately semicircular, the embedded column is approximately cylindrical, and a portion of the volume of the embedded column can be embedded in the groove.

7. The seat back rod and chassis assembly structure as described in claim 6, wherein a sleeve is sleeved on the outer edge of the embedded post and can rotate relative to the embedded post and can contact the surface of the groove.

8. The seat back bar and chassis assembly structure as described in claim 5, wherein the rear end of the side wall top is provided with an edge that can abut against the rear end of the chassis and simultaneously position the engaging post behind the groove.

9. The seat backrest and chassis assembly structure as described in claim 1, wherein two blocking pieces are protruding downward from the bottom surface of the chassis, and the side walls of the engaging seat are assembled on the outside of the two blocking pieces.

10. A seat back rod and chassis combination structure as described in claim 1, wherein the elastic device includes a spring, a pressure seat, and a connecting seat, the spring is arranged in the pressure seat and the connecting seat, and the pressure seat is in contact with the bottom surface of the connecting seat, and a contact portion is provided below the end of the connecting rod to contact with the side wall of the connecting slot to prevent the connecting rod from rotating, and a combination portion is provided below the contact portion, and the pressure seat has a top wall and an annular wall, and a first fitting groove is provided in the center to fit the top of the spring, and a second through hole is provided at the position of the first through hole of the back rod to be inserted into the connecting rod; the connecting seat has a bottom wall and an annular wall, and a second fitting groove is provided in the center to fit the bottom of the spring and the annular wall of the pressure seat, and a connecting hole is provided in the center of the bottom wall to be combined with the combination portion of the connecting rod.

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