TWI900401B - Seatback rod and chassis assembly structure - Google Patents

Abstract

The present invention relates to a seatback rod and chassis assembly structure, comprising a chassis, a seatback rod, an elastic device, and a connecting rod set. The chassis has a top surface and a bottom surface, along with a set of connecting slot holes. Additionally, the bottom surface is provided with grooves extending in the left and right directions. The front end of the bottom portion of the seatback rod is provided with a coupling base, which has two laterally opposed side walls. An engaging post, which can be embedded into the grooves, is arranged on the upper front side of the side walls. Furthermore, 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. By this configuration, the present invention provides improved operational stability and enhanced reclining comfort.

Description

Seat backrest and chassis assembly structure

The present invention relates to a seat backrest and chassis assembly structure, mainly a structure that can provide better reclining comfort.

In order to improve the comfort of reclining back, a conventional chair is connected to a back frame of the chair back, so that the elastic device can be compressed when the chair back is reclined, thereby providing elastic comfort.

Figures 8-10 illustrate the backrest and chassis assembly structure of a conventional chair. Figure 8 shows an inverted view, comprising a chassis 1', a backrest 2', an elastic device 3', and a pivot 4'. The chassis 1' is fixedly mounted below the seat (not shown) and has two downwardly protruding hinges 11', each of which has a pivot hole 111'. A coupling rod 12' is also positioned downwardly from the rear. The backrest 2' is connected to the back cushion (not shown). A pivot portion 21' is positioned at its bottom end, corresponding to the position of the hinges 11', and can be positioned between the two hinges 11'. The pivot portion 21' has a pivot hole 211'. The pivot portion 21' is positioned between the two pivot plates 11' and pivoted by the pivot rod 4' inserted through the pivot holes 111' and 211'. The back rod 2' is provided with a long slot 22' through which the assembly rod 12' is inserted. The elastic device 3' includes a spring 31', a socket 32', and a pressure seat 33'. The spring 31' is positioned within the socket 32' and the pressure seat 33'. The socket 32' is provided with an assembly hole 321' for assembling with the assembly rod 12', allowing the assembly rod 12' to be inserted into the slot 22' of the backrest 2', the pressure seat 33', the spring 31', the socket 32', and the assembly hole 321'. When the seat reclines, the backrest 2' pivots rearward relative to the chassis 1' about the pivot 4'. 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 force.

As shown in Figure 9, when the backrest 2' is not reclined, the distance between position A of the backrest 2' and the pivot 4' is D1. As shown in Figure 10, when the backrest 2' is reclined, its front end can be deflected downward, pivoting around the pivot 4', creating a horizontal distance D2 between position A of the backrest 2' and the pivot 4'. D2 is greater than D1 and corresponds to the tilt angle Ɵ of the bottom wall 1' to compress the spring 31'.

However, because the backrest 2' rotates about the fixed pivot point of the pivot 4', the further the front end of the backrest 2' (position A) moves downward, the greater the tilt angle between position A and the chassis 1'. This makes it difficult for the tilted position to compress the pressure seat 33', requiring increased force to compress the spring 31'. This also increases the pressure on the pivot 4'. As a result, the compression force of the spring 31' varies as the backrest 2' reclines from a small angle to a large angle, resulting in discomfort when reclining and a loss of the spring 31' at large reclining angles.

When assembling the back rod 2', the slot 22' of the back rod 2' must be inserted through the combination rod 12' and the elastic device 3', and the pivot hole 211' of the pivot portion 21' must be aligned with the pivot holes 111' of the two pivot pieces 11' before the pivot rod 4' is inserted and assembled, which is inconvenient to assemble.

The purpose of the present invention is to provide a structure that can improve lying comfort, stabilize movement and facilitate assembly.

The present invention comprises a chassis, a back rod, an elastic device, and a connecting rod. The chassis has a top and bottom surface, and is provided with a connecting slot. The bottom surface is provided with left and right grooves corresponding to the front of the connecting slot. A connecting seat is provided at the front end of the bottom of the back rod. The connecting seat has two opposing side walls. A connecting post is provided on the upper front of each side wall, which can be inserted into the groove. Furthermore, a first through hole is provided at a position corresponding to the connecting slot, extending upward and downward through the connecting seat. The elastic device is elastic and abuts against the bottom surface of the engagement seat; the connecting rod has an end portion with a diameter greater than the width of the connecting slot, and the connecting slot, the first through-hole, and the elastic device assembly can be inserted below the end portion. When the back rod is not subjected to force, the elastic force of the elastic element can cause the embedded column to be embedded in the groove and positioned; when the back rod moves backward, the elastic device can be compressed, and the embedded column can be displaced to partially or completely disengage from the groove.

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

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

One embodiment of the present invention further includes a limit block with restorative elasticity, which is arranged on the top surface of the chassis, and an elastic portion is provided corresponding to the position of the assembly slot, and a hook portion is provided behind the elastic portion to abut against the rear end of the assembly rod end.

In one embodiment of the present invention, the top surface of the chassis is provided with curved ridges at positions corresponding to the two sides of the assembly slots, which can abut against the bottom surfaces of the ends of the set of connecting rods.

In one embodiment of the present invention, two baffles are protruding downward from the bottom surface of the chassis, and the side walls of the engagement seat are assembled on the outer sides of the two baffles.

In one embodiment of the present invention, the rear end of the top of the side wall is provided with a support that can abut against the rear end of the chassis and simultaneously position the engaging post behind the groove.

In one embodiment of the present invention, the assembly slot extends from the rear end of the chassis toward the front, has two side walls, and an opening at the rear. A contact portion is provided below the end of the assembly rod to abut against the side walls of the assembly slot to prevent the assembly rod from rotating.

In one embodiment of the present invention, the elastic device includes a spring, a pressure seat, and a sleeve seat. The spring is arranged in the pressure seat and the sleeve seat, and the pressure seat is in contact with the bottom surface of the joint seat. The connecting rod is provided with a combination portion below the contact portion. The pressure seat has a top wall and an annular wall, and a first fitting groove in the center that can fit the top of the spring. A second through hole that can be inserted into the connecting rod is provided at the position corresponding to the first through hole of the back rod; the sleeve seat has a bottom wall and an annular wall, and a second fitting groove in the center that can fit the bottom of the spring and the annular wall of the pressure seat. A combination hole that can be combined with the combining portion of the connecting rod is provided in the center of the bottom wall.

After the present invention is assembled, the engaging post and the sleeve can be partially embedded in the groove and fixed in position. When the back rod is moved backward, the bottom surface of the engaging seat can press the pressing seat of the elastic device downward and compress the spring to generate compression elasticity. At this time, the bottom surface of the end of the connecting rod can be correspondingly offset along the curved surface flange and the engaging post can be correspondingly offset downward. The engaging post and the sleeve can be displaced to partially or completely disengage from the groove. Therefore, the engaging post of the present invention is not a fixed axis, and when the backrest is tilted back, the bottom surface of the engaging seat can be offset to stably abut the top wall of the pressure seat, so that the pressure seat can easily compress the spring under the force, and can provide a linear and smooth compression of the spring during the backrest tilting process for better comfort.

When the backrest is not reclined, the elastic force of the spring causes the bottom of the backrest to deflect upward. At this time, the engaging post and the sleeve can deflect accordingly, so that part of the sleeve engages with the surface of the groove. This can stabilize the backrest deflection and reduce actuation noise.

Referring to Figures 1-6, the present invention comprises a chassis 1, a backrest 2, an elastic device 3, a connecting rod 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 forward from the center of the rear end. 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. Two downwardly projecting baffles 16 are provided on the bottom surface 12, corresponding to the front of the grooves 15. Curved ridges 17 are provided on the top surface 11 at positions on both sides corresponding to the assembly slot 13.

A coupling seat 21 is provided at the front end of the bottom of the back bar 2. This coupling seat 21 has two opposing sidewalls 22 that can be assembled to the outer sides of the two baffles 16. A cylindrical engaging post 23 is provided on the upper front side of each sidewall 22, which can partially fit into the groove 15 in either direction. A sleeve 231 is sleeved around the outer edge of each engaging post 23, which can rotate relative to the engaging post 23 and contact the surface of the groove 15. Furthermore, a rear edge 24 is provided at the rear end of the top of each sidewall 22, which can abut against the rear end of the chassis 1. Furthermore, an upper edge 25 is provided on each sidewall 22, which 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.

The elastic device 3 includes a spring 31, a pressure seat 32, and a socket 33. The spring 31 is a compression spring. The pressure seat 32 has a top wall 321 and a surrounding wall 322. A first engagement 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 bar 2. A protruding edge 325 is provided around the second through-hole 324, which fits into the first through-hole 26 and abuts against the sidewall of the first through-hole 26.

The socket 33 has a bottom wall 331 and an annular wall 332 . A second fitting groove 333 is formed in the center thereof for fitting with the bottom of the spring 31 and the annular wall 322 of the pressure seat 32 . A connecting hole 334 is provided in the center of the bottom wall 331 .

The connecting rod 4 has an end portion 41 with 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, which abuts against the sidewall 131 of the connecting slot 13 to prevent the connecting rod 4 from rotating. Below the abutment portion 42, an assembly portion 43 is provided to be inserted through the first through hole 26, the second through hole 324, the spring 31, and the connecting hole 334 of the socket 33.

The stopper 5 is resilient 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 52 is provided at the rear of the elastic portion 51. The hook 52 has a guide slope 521 at the rear and a stop surface 522 at the front. Furthermore, the stopper 5 has a fitting groove 53 positioned corresponding to the curved ridge 17 on the top surface 11 of the chassis 1, and a fitting hole 54 is provided corresponding to the fitting hole 14 of the chassis 1. Fitting elements 55 are inserted through the fitting holes 54, 14, to securely connect the stopper 5 to the chassis 1. The fitting groove 53 fits over the curved ridge 17, enhancing the secure assembly of the stopper 5 and the chassis 1.

The present invention can be assembled into a whole before leaving the factory as shown in Figures 3 and 4. When the consumer unpacks and assembles the product, the connecting rod 4 can be aligned with the direction of the connecting slot 13 as shown in Figures 3 to 6, and the connecting seat 21 of the back rod 2 can be displaced toward the chassis 1. When the end 41 of the connecting rod 4 presses against the limit block 5, the connecting rod 4 can be assembled. When the hook portion 52 guides the inclined surface 521, the hook portion 52 can be 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 can rebound so that the blocking surface 522 can be located behind the end 41 of the connecting rod 4, thereby ensuring that the connecting rod 4, the elastic device 3, and the back rod 2 will not fall off the chassis 1.

At the same time, the rear edge 24 of the engagement seat 21 abuts against the rear end of the chassis 1 to prevent the engagement seat 21 from moving forward. The engaging post 23 and the sleeve 231 also partially fit within the groove 15 of the chassis 1 for positioning, facilitating assembly alignment and ensuring a more stable assembly. Furthermore, the user can rotate the sleeve 33 to adjust the compression force of the spring 31, further securing the end 41 of the connecting rod 4 and the top wall 321 of the engagement seat 21 to the chassis 1 and the abutment seat 32, thereby enhancing assembly stability.

After assembly, the sidewalls 22 of the engagement base 21 of the present invention can abut against the baffle 16 of the chassis 1. This prevents the back bar 2 from shifting left or right relative to the chassis 1, enhancing its stability when resting. Furthermore, the upper edge 25 of the engagement base 21 abuts against the bottom surface 12 of the chassis 1, further enhancing assembly stability. Therefore, the present design allows consumers to complete assembly by simply moving the back bar 2 toward the chassis 1, making the assembly process much simpler and faster than traditional methods.

Referring to Figures 6 and 7 , when the back bar 2 is moved rearward, the bottom surface of the engagement seat 21 compresses the elastic device 3's pressure seat 32 downward, compressing the spring 31 to generate compression. Consequently, the connecting rod 4 and the engaging post 23 can shift accordingly, and the engaging post 23 and the sleeve 231 can be displaced, partially or completely disengaging from the groove 15 . Therefore, the engaging post 23 of the present invention is not a fixed axis, and allows the bottom surface of the engagement seat 21 to shift and securely abut against the top wall 321 of the pressure seat 32 when the back bar 2 is tilted rearward. This allows the pressure seat 32 to easily compress the spring 31 under force, and can also provide a linear and smooth compression of the spring 31 during the backrest 2 reclining process, greatly improving the comfort of lying down.

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 correspondingly deflect so that part of the volume is restored to engage with the surface of the groove 15 , thereby stabilizing the deflection of the backrest 2 . In addition, the contact between the rotatable sleeve 231 and the surface of the groove 15 can reduce friction and reduce collision noise.

Therefore, from the above description, the present invention can have better lying comfort and convenient assembly 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.

1: Chassis 11: Top 12: Bottom 13: Assembly slot 131: Sidewall 132: Opening 14: Engagement hole 15: Groove 16: Baffle 17: Curved ridge 2: Back bar 21: Engagement seat 22: Sidewall 23: Engagement post 231: Sleeve 24: Rear support edge 25: Upper support edge 26: First through-hole 3: Spring mechanism 31: Spring 32: Pressure seat 321: Top wall 322: Annular wall 323: First engagement slot 324: Second through-hole 325: Support edge 33: Sleeve seat 331: Bottom wall 332: Circular wall 333: Second fitting groove 334: Assembly hole 4: Assembly rod 41: End 411: Bottom surface 42: Abutment portion 43: Assembly portion 5: Stopper 51: Elastic portion 52: Hook 521: Guide ramp 522: Stop surface 53: Fitting groove 54: Engagement hole 55: Engagement element 1': Chassis 11': Pivot plate 111': Pivot hole 12': Assembly rod 2': Back rod 21': Pivot portion 211': Pivot hole 22': Slotted hole 3': Elastic device 31': Spring 32': Socket 321': Assembly hole 33': Pressing seat 4': Pivot

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

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

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

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

Figure 5 is a diagram showing the backrest and chassis assembly of the chair of the present invention.

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

FIG7 is a schematic diagram showing the rearward displacement of the backrest of the chair of the present invention.

Figure 8 is an exploded view of the backrest and chassis of the learning chair.

Figure 9 is a cross-sectional view of the backrest and chassis assembly of the learning chair.

Figure 10 is a schematic diagram of the reclining compression spring of a conventional seat.

1: Chassis

12: Bottom surface

13: Assembly slot

131: Sidewall

132: Opening

14: Engagement hole

15: Groove

16: Baffle

2: Backbar

21: Joint seat

22: Sidewall

23:Embedded column

24: Back edge

25: Upper edge

26: First through hole

3: Elastic device

31: Spring

32: Pressure seat

322: Ring Wall

323: First set of slots

33: Socket

331: Bottom wall

332: Ring Wall

334: Assembly hole

4: Attachment

41:End

411: Bottom

42: Adhesion area

43: Assembly Department

5: Limit block

51: Elasticity

52: hook part

521: Guide slope

53: Fitting groove

54: Engagement hole

55:Joint element

Claims (10)

A seat backrest and chassis assembly structure comprises: A chassis having a top and bottom surface, each provided with a connecting slot, and the bottom surface having left and right grooves disposed in front of the connecting slot; A backrest having a coupling seat disposed at the front end of the bottom, the coupling seat having two left and right opposing side walls, a coupling post disposed on the upper front of the side wall that can be inserted into the groove in the left and right directions, and a first through-hole extending upward and downward through the coupling seat at a position corresponding to the connecting slot; An elastic device having elasticity and abutting against the bottom surface of the coupling seat; A connecting rod has an end portion with a diameter greater than the width of the connecting slot. The end portion extends through the connecting slot, the first through-hole, and the elastic device, allowing the connecting seat to abut against the bottom surface of the chassis. When the back rod is unloaded, the elastic force of the elastic element causes the engaging post to engage and position within the groove. When the back rod is moved rearward, the elastic device is compressed, allowing the engaging post to partially or completely disengage from the groove. As described in claim 1, the seat backrest and chassis assembly structure, wherein the groove is approximately semicircular, the engaging column is approximately cylindrical, and a portion of the volume of the engaging column can be embedded in the groove. As described in claim 2, the seat backrest and chassis assembly structure, wherein the outer edge of the embedded column is sleeved with a sleeve that can rotate corresponding to the embedded column and can contact the groove surface. The seat backrest and chassis assembly structure as described in claim 1 further includes a limit block, which has restorative elasticity and is arranged on the top surface of the chassis. An elastic part is provided corresponding to the position of the assembly slot, and a hook part is provided behind the elastic part to abut against the rear end of the assembly rod. As described in claim 4, the seat backrest and chassis assembly structure has a guide slope at the rear of the hook and a blocking surface at the front that can abut against the end of the connecting rod. As described in claim 1, the seat backrest and chassis assembly structure, wherein the top surface of the chassis is provided with curved flanges corresponding to the two sides of the assembly slot, which can abut against the bottom surface of the end of the assembly rod. As described in claim 1, the seat backrest and chassis assembly structure has two baffles protruding downward from the bottom surface of the chassis, and the side walls of the joint seat are assembled on the outer sides of the two baffles. As described in claim 1, the seat backrest and chassis assembly structure is provided with a rear edge at the top rear end of the side wall that can abut against the rear end of the chassis and simultaneously position the engaging column behind the groove position. As described in claim 1, the seat backrest and chassis assembly structure, wherein the assembly slot extends from the rear end of the chassis toward the front, has two side walls, and has an opening at the rear, and a rest portion is provided below the end of the assembly connecting rod that can abut against the side walls of the assembly slot to prevent the assembly connecting rod from rotating. As described in claim 9, the seat back rod and chassis assembly structure, wherein the elastic device includes a spring, a pressure seat, and a socket, the spring is arranged in the pressure seat and the socket, and the pressure seat abuts against the bottom surface of the coupling seat, and the assembly rod has a combination portion below the abutting portion, and the pressure seat has a top wall and an annular wall, and a first fitting groove in the center that can fit the top of the spring, and a second through hole that can be inserted into the assembly rod is provided at the position corresponding to the first through hole of the back rod; the socket has a bottom wall and annular wall, and a second fitting groove in the center that can fit the bottom of the spring and the pressure seat annular wall, and a combination hole that can be combined with the combination portion of the assembly rod is provided in the center of the bottom wall.