Chair backrest and base plate assembly

Abstract

This invention provides an assembly of a chair's backrest and base plate that can improve the comfort of leaning back, the stability of movement, and the ease of assembly. [Solution] The chair back and base plate assembly according to the present invention includes a base plate 1, a back column 2, an elastic device 3, and a connecting rod 4. The base plate has a top surface, a bottom surface 12, and a connecting groove hole 13, and a left-right groove 15 is provided on the bottom surface. A connecting holder 21 is provided at the front end of the bottom of the back column, and the connecting holder has two side walls 22 that are opposite to each other on the left and right. A fitting connecting column 23 that can be fitted into the groove is provided on the upper front side of the side wall, and a first through hole 26 is provided at a position corresponding to the connecting groove hole. The elastic device is elastic and abuts against the bottom surface of the connecting holder. The connecting rod has an end 41 whose diameter is larger than the width of the connecting groove hole, and the lower part of the end is inserted through the connecting groove hole, the first through hole, and the elastic device.

Description

Technical Field

[0001] The present invention relates to an assembly of a back column and a base plate of a chair, and mainly relates to an assembly that can provide good reclining comfort.

Background Art

[0002] Known chairs connect an elastic device to the back frame of the backrest in order to improve the comfort of reclining of the back, so that the elastic device can be compressed when the backrest is reclined, and the elastic device is provided with elastic comfort.

[0003] Figures 8 to 10 show the assembly structure of the backrest and base plate of a known chair. Figure 8 is an inverted view and includes a base plate 1', backrest 2', elastic device 3', and pivot pin 4'. The base plate 1' is fixedly installed below the seat (not shown) and has two pivot pieces 11' that protrude downward. The pivot pieces 11' are provided with pivot holes 111', and an assembly rod 12' is provided at the rear, facing downward. The backrest 2' is connected to a backrest pad (not shown), and a pivot part 21' is provided at a position corresponding to the pivot piece 11' at the bottom end, which can be installed between the two pivot pieces 11'. The pivot part 21' is provided with a pivot hole 211'. This allows the pivot part 21' to be installed between the two pivot pieces 11', and the pivot pin 4' to be pivotally attached by inserting it through the pivot holes 111' and 211'. Furthermore, the back column 2' is provided with an elongated groove 22' through which the assembly rod 12' can be inserted. The elastic device 3' includes a spring 31', a joint holder 32', and a pressure holder 33', with the spring 31' being installed inside the joint holder 32' and the pressure holder 33'. The joint holder 32' is also provided with a connecting hole 321' into which the assembly rod 12' can be assembled, allowing the assembly rod 12' to be inserted into the groove 22', pressure holder 33', spring 31', and joint holder 32' of the back column 2' and assembled with the connecting hole 321'. When sitting and leaning back against the backrest, the back column 2' can be pivoted relative to the base plate 1' using the axis pin 4' as the axis of rotation and moved backward, and the position of the front bottom surface A of the back column 2' presses against the pressure holder 33' and compresses the spring 31', generating an elastic recovery force.

[0004] As shown in Figure 9, when not leaning against the back column 2', there is a gap D1 between position A of the back column 2' and the axle pin 4'. Also, as shown in Figure 10, when leaning against the back column 2', its front end can move downward around the axle pin 4' as the axis of rotation, and a horizontal gap D2 can be created between position A of the back column 2' and the axle pin 4'. D2 is greater than D1 and has an inclination angle θ with respect to the base plate 1', which compresses the spring 31'.

[0005] However, since the back column 2' rotates with the shaft pin 4' as the fixed axis of rotation, as the distance the front end of the back column 2' moves downward increases, the inclination angle between position A and the base plate 1' increases. At this inclined position, it becomes difficult to press the pressure holder 33' in an oblique direction, requiring an increased force to compress the spring 31', and simultaneously increasing the pressure on the shaft pin 4'. As a result, there was an unpleasant feeling due to the difference in the compressive force of the spring 31' when the back column 2' was moved from a small to a large backward tilt angle, and the drawback that it was not easy to compress the spring 31' when the backward tilt angle was large.

[0006] Furthermore, the back column 2' had the disadvantage of being inconvenient to assemble, as it required inserting the assembly rod 12' into the groove 22' of the back column 2' during assembly and integrating it with the elastic device 3', and also requiring aligning the pivot hole 211' of the pivot part 21' with the pivot hole 111' of the two pivot pieces 11' before inserting the shaft pin 4'. [Overview of the project] [Problems that the invention aims to solve]

[0007] The object of the present invention is to provide an assembly that can improve the comfort of leaning, the stability of movement, and the ease of assembly. [Means for solving the problem]

[0008] The chair assembly comprising the backrest and base plate according to the present invention includes a base plate, a backrest, an elastic device, and a connecting rod. The base plate has a top surface, a bottom surface, and a joint groove hole. A groove running in the left-right direction is provided in front of the joint groove hole on the bottom surface. A connecting holder is provided at the front bottom end of the back column. The connecting holder has two opposing side walls, and a lateral fitting connecting column is provided on the upper front side of the side walls that can be fitted into a recessed groove. A first through hole is provided at a position corresponding to the connecting groove hole of the connecting holder, extending vertically. The elastic device is elastic and is in contact with the bottom surface of the bonding holder. The connecting rod has an end with a diameter larger than the width of the connecting groove hole, and the lower end of the end is inserted through the connecting groove hole, the first through hole and the elastic device, and is assembled by bringing the connecting holder and the bottom surface of the base plate into contact. Furthermore, when the back column is not subjected to any force, the elastic force of the elastic device can position the fitting connection column by fitting it into the groove. When the back column is moved backward, the elastic device can be compressed, and the fitting connection column can move, causing part or all of the fitting connection column to disengage from the groove.

[0009] In one embodiment of the present invention, the groove is semicircular in shape, the fitting connection column is cylindrical in shape, and a portion of the fitting connection column can be fitted into the groove.

[0010] In one embodiment of the present invention, a sleeve is provided on the outer edge of the fitting connection column that can rotate relative to the fitting connection column and can contact the surface of the groove.

[0011] One embodiment of the present invention further includes a stopper. The stopper has elastic recovery force, is installed on the top surface of the base plate, and has an elastic portion positioned to correspond to the joint groove hole. The elastic portion has a claw portion at the rear that can abut against the rear of the end of the joint rod.

[0012] In one embodiment of the present invention, the claw portion is provided with a guide slope at the rear and a stopper surface at the front that can abut against the end of the connecting rod.

[0013] In one embodiment of the present invention, curved convex edges are provided on both sides of the joint groove hole on the top surface of the base plate, which can abut against the bottom surface of the end of the joint rod.

[0014] In one embodiment of the present invention, two retaining pieces are provided projecting downward from the bottom surface of the base plate, and the side wall of the joining holder is attached to the outside of the two retaining pieces.

[0015] In one embodiment of the present invention, the rear end of the top of the side wall is provided with a rear contact edge that abuts against the rear end of the base plate and simultaneously positions the fitting connection column in the groove.

[0016] In one embodiment of the present invention, the joining groove extends forward from the rear end of the base plate, has two side walls, and has an opening at the rear. Below the end of the joining rod, there is a contact portion that abuts against the side wall of the joining groove to prevent the joining rod from rotating.

[0017] In one embodiment of the present invention, the elastic device includes a spring, a pressure holder, and a joint holder. The spring is installed inside the pressing holder and the joint holder, and the bottom surfaces of the pressing holder and the joint holder are in contact. The lower part of the contact portion of the connecting rod is equipped with an assembly section. The pressing holder has a top wall and an annular wall, a first fitting hole in the center that can be fitted onto the top of the spring, and a second through hole that can be inserted through a connecting rod, located at a position corresponding to the first through hole in the back column. The joint holder has a bottom wall and an annular wall, and in the center is a second fitting hole that can be fitted to the bottom of the spring and the annular wall of the pressing holder, and in the center of the bottom wall is a joining hole that can be assembled with the assembly part of the joining rod. [Effects of the Invention]

[0018] After assembly, the fitting connection column and a part of the sleeve can be firmly positioned by fitting them into the concave groove. Further, when the back column is moved backward, the bottom surface of the joint holder presses the pressing holder of the elastic device and moves it downward, and the spring can be compressed to generate compressive elasticity. And at this time, the bottom surface of the end of the joint rod can move corresponding to the curved flange, and the fitting connection column can move downward correspondingly, and the fitting connection column and the sleeve can move to disengage part or all of them from the concave groove. Therefore, the fitting connection column of the present invention is not a fixed rotating shaft, and even when the back column is tilted backward, the bottom surface of the joint holder can stably contact and move with the top wall of the pressing holder. Thereby, the pressing holder can easily receive force and compress the spring, and can provide a smooth compression presenting linearity to the spring during the backward tilting process of the back column, and can provide good comfort.

[0019] When the back column is not leaning against, the elastic force of the spring can move the bottom of the back column upward. And at this time, the fitting connection column and the sleeve can move correspondingly to join a part of the volume of the sleeve with the surface of the concave groove, stabilize the movement operation of the back column, and have the effect of reducing the operation noise.

Brief Description of the Drawings

[0020] [Figure 1] It is a plan view decomposition diagram of the assembly of the back column and the base plate of the chair of the present invention. [Figure 2] It is a bottom view decomposition diagram of the assembly of the back column and the base plate of the chair of the present invention. [Figure 3] It is a joint conceptual diagram when combining the back column, the elastic device, and the joint rod in the plane direction of the chair of the present invention with the base plate. [Figure 4] It is a joint conceptual diagram when combining the back column, the elastic device, and the joint rod in the bottom view direction of the chair of the present invention with the base plate. [Figure 5] It is an assembly drawing of the back column and the base plate of the chair of the present invention. [Figure 6] It is an assembled cross-sectional view of the back column and the base plate of the chair of the present invention. [Figure 7] It is a conceptual diagram of the back column of the chair of the present invention moving backward. [Figure 8] It is an exploded view of the back column and the base plate of a known chair. [Figure 9] It is an assembled cross-sectional view of the back column and the base plate of a known chair. [Figure 10] It is a conceptual diagram of the back column of a known chair tilting backward and compressing a spring.

Mode for Carrying Out the Invention

[0021] Please refer to FIGS. 1 to 6. The present invention includes a base plate 1, a back column 2, an elastic device 3, a joining rod 4, and a stopper 5. The base plate 1 is attached below the seat portion (not shown) of the chair, has a top surface 11 and a bottom surface 12, and also has a joining groove hole 13 extending forward from the center of the rear end. The joining groove hole 13 has two parallel side walls 131 and an opening 132 at the rear. Further, joining holes 14 are provided on both the left and right sides of the joining groove hole 13, and a concave groove 15 in the left-right direction is provided in front of the joining groove hole 13 on the bottom surface 12. The concave groove 15 has a substantially semi-circular shape. Further, two retaining pieces 16 project downward at positions in front of the concave groove 15 on the bottom surface 12. Further, curved flanges 17 are provided at positions on both sides of the joining groove hole 13 on the top surface 11.

[0022] A connecting holder 21 is provided at the front bottom end of the back column 2. The connecting holder 21 has two side walls 22 that are opposite to each other on the left and right sides and can be attached to the outside of the two fastening pieces 16. A cylindrical fitting connection column 23 is provided on the upper front side of the side walls 22, with a portion of it fitting into the groove 15. A sleeve 231 is fitted to the outer edge of the fitting connection column 23, which can rotate relative to the fitting connection column 23 and can contact the surface of the groove 15. In addition, a rear contact edge 24 is provided at the rear top end of the two side walls 22, which can abut against the rear end of the base plate 1. The side walls 22 are also provided with an upper contact edge 25 that can abut against the bottom surface 12 of the base plate 1. Furthermore, a first through hole 26 is provided vertically at a position corresponding to the connecting groove hole 13 of the connecting holder 21.

[0023] The elastic device 3 includes a spring 31, a pressure holder 32, and a joint holder 33. The spring 31 is a compression spring. The pressure holder 32 has a top wall 321 and an annular wall 322, and has a first fitting hole 323 in the center that can be fitted into the top of the spring 31, and a second through hole 324 is provided at a position corresponding to the first through hole 26 of the back column 2. A contact edge 325 is provided on the periphery of the second through hole 324 that can be fitted into the first through hole 26 and abuts against the side wall of the first through hole 26.

[0024] The joint holder 33 has a bottom wall 331 and an annular wall 332, and in the center is a second fitting hole 333 that can be fitted to the bottom of the spring 31 and the annular wall 322 of the pressing holder 32, and a joining hole 334 is provided in the center of the bottom wall 331.

[0025] The connecting rod 4 has an end portion 41 whose diameter is larger than the width of the connecting groove hole 13, and the bottom surface 411 of the end portion 41 abuts against the curved convex edge 17 of the base plate 1. Below the end portion 41, there is a rectangular contact portion 42 that abuts against the side wall 131 of the connecting groove hole 13 to prevent the connecting rod 4 from rotating. The contact portion 42 has an assembly portion 43 below it 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 joint holder 33 for assembly.

[0026] The stopper 5 has elastic recovery force and is installed on the top surface 11 of the base plate 1, with an elastic part 51 provided at a position corresponding to the joining groove hole 13. The elastic part 51 has a claw part 52 at the rear, and the claw part 52 has a guide slope 521 at the rear and a stopping surface 522 at the front. In addition, the stopper 5 has a fitting groove 53 at a position corresponding to the curved convex edge 17 of the top surface 11 of the base plate 1, and a joining hole 54 at a position corresponding to the joining hole 14 of the base plate 1. Furthermore, by inserting the joining member 55 through the joining hole 54 and joining hole 14, the stopper 5 can be joined and fixed to the base plate 1, and the fitting groove 53 fits into the curved convex edge 17, thereby improving the robustness of the assembly of the stopper 5 and the base plate 1.

[0027] As shown in Figures 3 and 4, the present invention allows the back column 2, elastic device 3, and connecting rod 4 to be pre-assembled and packaged together before shipment. When the consumer opens the box and assembles the product, as shown in Figures 3 to 6, the connecting rod 4 can be aligned with the direction of the connecting groove hole 13, and the connecting holder 21 of the back column 2 can be moved toward the base plate 1. When the end 41 of the connecting rod 4 presses against the guide slope 521 of the claw portion 52 of the stopper 5, the claw portion 52 is moved upward, allowing the connecting rod 4 to continue moving forward. Furthermore, when the connecting rod 4 moves below the elastic portion 51, the claw portion 52 can rebound and return, positioning the stopping surface 522 behind the end 41 of the connecting rod 4, thereby ensuring that the connecting rod 4, elastic device 3, and back column 2 do not detach from the base plate 1.

[0028] At the same time, the rear contact edge 24 of the connecting holder 21 can contact the rear end of the base plate 1, thereby restricting the connecting holder 21 from moving further forward. In addition, the fitting connection column 23 and a portion of the sleeve 231 can be fitted into the groove 15 of the base plate 1 for positioning, making assembly alignment convenient and providing a good effect in stabilizing the assembly. Furthermore, the user can rotate the joint holder 33 to adjust the compression elasticity of the spring 31, and the end 41 of the connecting rod 4 and the top wall 321 of the pressing holder 32 can grip the base plate 1 and the connecting holder 21 more firmly, thereby improving the robustness of the assembly.

[0029] In this invention, when assembled, the side wall 22 of the connecting holder 21 can be made to contact with the stopper piece 16 of the base plate 1. This prevents the back column 2 from moving left or right relative to the base plate 1, thereby improving the stability of leaning. In addition, the upper contact edge 25 of the connecting holder 21 can contact the bottom surface 12 of the base plate 1, further improving the stability of the assembly. Therefore, the design of this invention allows consumers to complete the assembly simply by moving the back column 2 toward the base plate 1, making the assembly process much simpler and faster than with conventional methods.

[0030] Please refer to Figures 6 and 7. In this invention, when the back column 2 is moved backward, the bottom surface of the connecting holder 21 presses against the pressing holder 32 of the elastic device 3, causing it to move downward and compress the spring 31 to generate compressive elasticity. At the same time, the connecting rod 4 can move in correspondence, and the fitting connecting column 23 can move in correspondence downward, and the fitting connecting column 23 and the sleeve 231 can move, causing part or all of them to disengage from the groove. Therefore, the fitting connecting column 23 of this invention is not a fixed rotating shaft, and even when the back column 2 is tilted backward, the bottom surface of the connecting holder 21 can stably contact and move against the top wall 321 of the pressing holder 32. As a result, the pressing holder 32 can easily receive force and compress the spring 31, and a linear and smooth compression can be provided to the spring 31 during the backward tilting process of the back column 2, greatly improving the comfort of leaning back.

[0031] In this invention, when the back column 2 is not being leaned against, the elastic force of the spring 31 allows the bottom of the back column 2 to move upward. Furthermore, as shown in Figure 6, at this time, the fitting connection column 23 and the sleeve 231 move in correspondence, and a portion of their volume can come into contact with the surface of the groove 15, thereby restoring their position. This has the effect of stabilizing the movement of the back column 2, and the rotatable sleeve 231 can contact the surface of the groove 15 to reduce frictional force and reduce collision noise.

[0032] In summary, the present invention can provide excellent leaning comfort and convenient assembly. However, the above-described embodiments are illustrative of the present invention and do not limit it. Any modifications that achieve equivalent effects based on the spirit of the present invention fall within the scope of the present invention. [Explanation of symbols]

[0033] 1 Base plate 11 Top surface 12. Base 13 Joining groove hole 131 Side wall 132 Aperture 14 Junction hole 15 grooves 16. Stopper 17. Curved convex edge 2 back pillar 21 Joining holder 22 Side wall 23 Interlocking connecting column 231 Sleeves 24 Rear contact edge 25 Upper contact edge 26 First through hole 3. Elastic device 31 Springs 32 Pressing holder 321 Top Wall 322 Ring Wall 323 First fitting hole 324 Second through hole 325 Abutting edge 33 Joint holder 331 Bottom wall 332 Ring Wall 333 Second fitting hole 334 Junction hole 4 Joining rods 41 End 411 Bottom 42 Contact part 43 Assembly Department 5 Stopper 51 Elastic part 52 Claw part 521 Guide Slope 522 Stopping surface 53 Fitting groove 54 Junction hole 55 Joining member 1' Baseplate 11' pivot piece 111' Pivot hole 12' Assembled Rod 2' dorsal column 21' Pivot joint 211' Pivot hole 22' slot 3' Elastic device 31' Spring 32' Joint Holder 321' Junction hole 33' Pressing holder 4' Axle pin

Claims

1. A base plate having a top surface, a bottom surface, and a joining groove hole, wherein a groove is provided in the left-right direction in front of the joining groove hole on the bottom surface, A connecting holder is provided at the front end of the bottom, the connecting holder has two side walls that are opposite to each other on the left and right, and a left-right fitting connecting column that can be fitted into the groove is provided on the front upper side of the side walls, and a first through hole that penetrates vertically is provided at a position corresponding to the connecting groove hole of the connecting holder, the back column and An elastic device having elasticity and in contact with the bottom surface of the bonding holder, A joining rod having an end with a diameter greater than the width of the joining groove hole, the lower part of the end being inserted into the joining groove hole, the first through hole and the elastic device, and assembled by bringing the joining holder and the bottom surface of the base plate into contact, Includes, Furthermore, an assembly of a chair back and base plate, wherein when the back column is not subjected to any force, the elastic force of the elastic device can position the fitting connection column by fitting it into the groove, the elastic device can be compressed when the back column is moved backward, and the fitting connection column can move, causing part or all of the fitting connection column to disengage from the groove.

2. The chair backrest and base plate assembly according to claim 1, wherein the groove is semicircular in shape, the fitting connection column is cylindrical in shape, and a part of the fitting connection column can be fitted into the groove.

3. The chair backrest and base plate assembly according to claim 2, wherein a sleeve is provided on the outer edge of the fitting connection column that can rotate relative to the fitting connection column and can contact the surface of the groove.

4. It also contains stoppers, The chair backrest and base plate assembly according to claim 1, wherein the stopper has elastic recovery force, is installed on the top surface of the base plate, has an elastic part at a position corresponding to the joining groove hole, and the elastic part has a claw portion at the rear that can abut the rear of the end of the joining rod.

5. The chair backrest and base plate assembly according to claim 4, wherein the claw portion is provided with a guide slope at the rear and a stopper surface at the front that can contact the end of the connecting rod.

6. The chair backrest and base plate assembly according to claim 1, wherein curved convex edges are provided on both sides of the top surface of the base plate, relative to the joining groove hole, so as to be able to abut against the bottom surface of the end of the joining rod.

7. The chair backrest and base plate assembly according to claim 1, wherein two fastening pieces are provided protruding downward from the bottom surface of the base plate, and the side wall of the joining holder is attached to the outside of the two fastening pieces.

8. The chair back column and base plate assembly according to claim 1, wherein the rear end of the top of the side wall is provided with a rear contact edge that abuts against the rear end of the base plate and simultaneously positions the fitting connection column in the position of the groove.

9. The chair backrest and base plate assembly according to claim 1, wherein the joining groove extends forward from the rear end of the base plate, has two side walls, and has an opening at the rear, and below the end of the joining rod there is a contact portion that can abut against the side wall of the joining groove to prevent the joining rod from rotating.

10. The elastic device includes a spring, a pressure holder, and a joint holder. The spring is installed inside the pressing holder and the joint holder, and the bottom surfaces of the pressing holder and the joining holder are in contact. The lower part of the contact portion of the connecting rod is provided with an assembly portion. The pressing holder comprises a top wall and an annular wall, and has a first fitting hole in the center that can be fitted onto the top of the spring, and a second through hole is provided in the back column at a position corresponding to the first through hole through the back column through which the connecting rod can be inserted. The chair backrest and base plate assembly according to claim 9, wherein the joint holder comprises a bottom wall and an annular wall, and has a second fitting hole in the center that can be fitted to the bottom of the spring and the annular wall of the pressing holder, and a joining hole is provided in the center of the bottom wall that can be assembled with the assembly part of the joining rod.

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