Armrest

Abstract

To provide an armrest that can move relatively in accordance with the rotation of the backrest of a chair and does not deteriorate the comfort of use for a user. [Solution] It includes a first rod portion, a second rod portion fitted onto the outer periphery of the first rod portion so as to be slidably adjustable, a third rod portion rotatably attached to one end of the second rod portion, a first mounting hole 10 drilled through the end of the first rod portion, the first rod portion being connected to the side of the chair seat via the first mounting hole, and a second mounting hole 27 drilled through the end of the third rod portion, the third rod portion being connected to the side of the chair back via the second mounting hole.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to a Chinese utility model patent application filed on February 24, 2025, bearing application number 202520298985.4 and entitled "Armrest," the entire contents of which and any amendments thereto are incorporated herein by reference.

[0002] The present invention relates to the field of chair technology, and more particularly to armrests. [Background technology]

[0003] A chair is a seating device that has a backrest and may also have armrests. Usually, the armrests of a chair cannot be adjusted according to the rotation of the chair back. Therefore, when a user rotates the chair back and changes their sitting posture, the fixed armrests no longer meet the user's needs, which reduces the user's comfort.

[0004] For example, US Patent No. 20150289653A1 discloses an armrest mechanism for a chair, which includes a slidable member and an actuator, allowing effective vertical adjustment of the armrest pad. However, this design does not address the problem of linking the rotation of the armrest with the backrest. Therefore, even if the height of the armrest can be adjusted when the backrest rotates and the user's sitting position changes, its horizontal position and angle remain fixed, which does not dynamically meet the user's need to support their arms, and the drawback of comfort still exists. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] US Patent US20150289653A1 Summary of the Invention [Problem to be solved by the invention]

[0006] In response to the shortcomings of the prior art, the present invention provides armrests to solve the technical problem that the armrests of some prior chairs cannot rotate along with the backrest, which does not meet the needs of users. [Means for solving the problem]

[0007] The above technical object of the present invention is achieved by the following technical solutions. an armrest comprising a first rod portion, a second rod portion slidably fitted onto the outer periphery of the first rod portion, a third rod portion rotatably attached to one end of the second rod portion, a first mounting hole formed through an end of the first rod portion, the first rod portion being connected to a side surface of a chair seat via the first mounting hole, a second mounting hole formed through an end of the third rod portion, the third rod portion being connected to a side surface of a chair back via the second mounting hole, and the second and third rod portions rotating when the chair back and seat rotate.

[0008] an armrest comprising: a first rod portion for fixed connection to the seat of a chair; a second rod portion slidably fitted around the outer periphery of the first rod portion; a third rod portion for fixed connection to the back of the chair and for rotatably connecting to the second rod portion; a position limiting assembly provided between the first and second rod portions and including a first slide groove and at least one protrusion formed in the first rod portion; a limiting rod passing through the first slide groove; and an elastic member for driving the limiting rod to engage with the protrusion, wherein the sliding adjustment of the second rod portion relative to the first rod portion is achieved by pressing the limiting rod to release the engagement.

[0009] Working principle: When a user sits on the seat and adjusts the backrest, the third rod moves in accordance with the rotation of the backrest, and the connection point between the third rod and the second rod rotates, allowing the user to place their arms on the third rod. If further adjustment is required, the second rod portion is slid relative to the first rod portion, causing the first rod portion and the second rod portion to slide relative to each other, and once the adjustment is complete, the first rod portion and the second rod portion are fixed again.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The third rod portion and the second rod portion can move relative to each other in accordance with the rotation of the backrest, allowing the user's arm to be placed more firmly on one end of the third rod portion. 2. The first rod part and the second rod part can be slid to move the third rod part along with the second rod part, and the third rod part can be further adjusted.

[0011] The accompanying drawings in the specification, which are a part of this application, are intended to facilitate a further understanding of the present invention, and the illustrative embodiments of the present invention and the description thereof are intended to be illustrative of the present invention and are not intended to unduly limit the present invention. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a structural schematic diagram of an embodiment of the present invention; [Figure 2] FIG. 2 is a structural schematic diagram of the first end portion. [Figure 3] FIG. 2 is a structural schematic diagram of the embodiment of the present invention viewed from a different angle. [Figure 4] 3 is a schematic cross-sectional view of a limiting rod portion according to an embodiment of the present invention; [Figure 5] FIG. 10 is a structural schematic diagram of the first end portion viewed from a different angle. [Figure 6] FIG. 10 is a structural schematic diagram of the second end portion viewed from a different angle. [Figure 7] 10 is a structural schematic diagram of a second closure cap, a limiting rod, a first closure cap, and an engaging claw. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. Of course, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The description of at least one exemplary embodiment below is for illustrative purposes only and does not impose any limitations on the present invention and its application or use. Any other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work also fall within the protection scope of the present invention.

[0014] It should be noted that the terms used herein are used only to describe specific embodiments and are not intended to be limiting to the exemplary embodiments of the present application. In this specification, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it should be understood that the terms "comprise" and / or "comprises" as used herein indicate the presence of features, steps, operations, parts, assemblies, and / or combinations thereof.

[0015] Unless otherwise specifically stated, the relative arrangement of components and steps, formulas, and numerical values ​​described in these embodiments do not limit the scope of the present invention. It should also be understood that the dimensions of each part shown in the drawings are not drawn to actual proportions for convenience of depiction. While techniques, methods, and devices known to those skilled in the art may not be discussed in detail, such techniques, methods, and devices should be considered part of the patented specification, where appropriate. In all examples shown and discussed herein, any specific values ​​should be construed as illustrative rather than limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that in the following figures, like numbers and letters indicate similar elements, and therefore, once an element is defined in one drawing, further discussion of it in subsequent drawings is unnecessary.

[0016] As shown in FIG. 1, the armrest includes a first rod portion, a second rod portion slidably fitted around the outer periphery of the first rod portion, and a third rod portion rotatably attached to one end of the second rod portion. The first rod portion has a first mounting hole 10 formed therethrough, which is connected to the side of the chair seat via the first mounting hole 10 and a screw rod with a nut threaded through the first mounting hole 10 to connect to the chair seat. The third rod portion has a second mounting hole 27 formed therethrough, which is connected to the side of the chair back via the second mounting hole 27 and a screw rod with a nut threaded through the second mounting hole 27 to connect to the chair back. When the chair back and seat rotate, the second and third rod portions rotate, and the upper end of the third rod extends to form a support end for attaching an armrest. Once the armrest is attached to the support end, the user can rest their arms on the armrest.

[0017] As can be seen, when a user sits on the seat and adjusts the backrest, the third rod portion moves in accordance with the rotation of the backrest, and the connection point between the third rod portion and the second rod portion rotates, allowing the user to place their arms on the third rod portion.

[0018] If further adjustment is required, the second rod section can be slid relative to the first rod section, and the first and second rod sections can be slid relative to each other. Once the adjustment is complete, the first and second rod sections can be fixed again, and the height of the third rod section can be adjusted, allowing it to be adapted to changes in the position of the arm.

[0019] As shown in Figures 1 and 2, the first rod section includes a first mounting block 16 and a first rod section 18, a first mounting hole 10 is drilled through the first mounting block 16, the first rod section 18 has a hollow structure, and a first sliding groove 22 is drilled through each end surface on both sides of the first rod section 18, and one of the first sliding grooves 22 has several protrusions 20 fixedly provided on both side walls. Preferably, in this embodiment, each side wall of the first sliding groove 22 has four protrusions 20, i.e., five levels of adjustment are possible. The protrusions 20 may have various shapes such as a triangle, a rectangle, a trapezoid, etc., and in this embodiment, the protrusions 20 are trapezoidal.

[0020] As shown in Figures 3 to 6, the second rod portion includes a second mounting block 31 and a second rod section 24, and the second rod section 24 has a hollow structure and is slidably fitted onto the outer periphery of the first rod section 18.

[0021] As shown in Figure 6, an annular ring 29 is provided on both end faces of the second rod section 24, a first mounting hole 15 is drilled through both end faces of the second rod section 24, and the first mounting hole 15 is drilled in the corresponding annular ring 29, and two second mounting holes 28 are drilled through one end face of the second rod section 24, and the two second mounting holes 28 are drilled on both sides of the first mounting hole 15, and the second mounting holes 28 are drilled in the annular ring 29.

[0022] As shown in Figures 3 to 7, a first closing cap 25 is installed in an annular ring 29 having second mounting holes 28 formed therein. Two engaging claws 30 are installed at one end of the first closing cap 25. The engaging claws 30 are elastic and can be elastically deformed to a certain extent. The two engaging claws 30 are inserted into the corresponding two second mounting holes 28 to attach the first closing cap 25 to the second rod section 24. A second closing cap 11 is installed in the other annular ring 29. A limiting rod 21 is fixedly installed at the end of the second closing cap 11 near the second rod section 24. The rod 21 passes through the two first slide grooves 22, and the two protrusions 20 located on the same side of the first slide groove 22, or the protrusions 20 and the side wall of the first slide groove 22 jointly engage with the limiting rod 21. When the limiting rod 21 is located between the two protrusions 20, the sides of the two protrusions 20 fix the limiting rod 21, and when the limiting rod 21 is located between one protrusion 20 and the side wall of the first slide groove 22, the one protrusion 20 and the side wall of the first slide groove 22 jointly fix the limiting rod 21, thereby restricting the relative position of the first rod part and the second rod part. Grooves 19 are formed on both ends of the limiting rod 21, and the grooves 19 do not contact the protrusions 20. An elastic member 23 is connected between the limiting rod 21 and the first closing cap 25. Preferably, in this embodiment, the elastic member 23 is a spring. When it is desired to move the limiting rod 21 along the longitudinal direction of the first sliding groove 22, the limiting rod 21 is pushed and moved toward the first closing cap 25, so that the groove 19 moves to the position of the first sliding groove 22. After moving the limiting rod 21 along the longitudinal direction of the first sliding groove 22 to an appropriate position, the limiting rod 21 is then released. The limiting rod 21 will then return to its original position due to the action of the spring, and the groove 19 will move away from the first sliding groove 22, thereby restricting the relative positions of the first rod portion and the second rod portion, and the adjustment of the first rod portion and the second rod portion is completed.

[0023] In addition, two force-receiving rods 26 are provided on the inner wall of the second rod section 24, a second slide groove 17 is provided at one end of the first rod section 18, and the two force-receiving rods 26 are slidably provided within the second slide groove 17, further increasing the stability when the first rod section and the second rod section move.

[0024] As shown in Figures 1 to 3, the third rod section includes two third mounting blocks 13 and a third rod section 14, the third mounting block 13 is provided at one end of the third rod section 14, the second mounting block 31 is rotatably provided between the two third mounting blocks 13, the second mounting block 31 and the third mounting block 13 are both disk-shaped, and the connecting shaft 12 is provided through the two third mounting blocks 13 and the second mounting block 31 to limit the position of the third mounting block 13 and the second mounting block 31 and allow the third mounting block 13 and the second mounting block 31 to rotate relative to each other, a second mounting hole 27 is drilled at the end of the third rod section 14, and the third rod section is connected to the side of the chair back through the second mounting hole 27.

[0025] In another embodiment (not shown), the first rod section 18, second rod section 24, and third rod section 14 are all made of hollow aluminum alloy pipe, reducing weight by 60%. A rotary child lock (requiring a rotary key to unlock) is added to the center of the second closure cap 11 to prevent children from tampering with the slide adjustment. The protrusion 20 is arc-shaped to prevent scratches and increase the force required for adjustment. A food-grade silicone armrest pad is attached to the top end of the third rod section 14 and can be removed and washed. The lightweight design is suited to children's body shapes, and parents can lock it with a single touch to prevent accidental adjustment. The arc-shaped protrusions improve safety, and the easy-to-clean armrest pad meets hygiene needs.

[0026] In another embodiment (not shown), a fourth rod (short link) is added between the second and third rods, forming a double-rotation axis structure (seat → first rod → second rod → fourth rod → third rod → backrest) for improved forward / backward translation. The protrusions 20 and springs are eliminated, and magnetic tape is embedded on the inner wall of the second rod section 24, while a row of metal plates is installed on the outer wall of the first rod section 18, achieving stepless sliding locking through magnetic attraction. The second closing cap 11 is replaced with a press-type unlock button, allowing for magnetic release and adjustment with a single press. The double-rotation axis structure supports three-dimensional adjustment of the armrests (forward / backward, up / down, and angle). The stepless magnetic locking mechanism meets the precise operating posture needs of eSports players and allows quick one-handed adjustment for an improved user experience.

[0027] In another embodiment (not shown), a flat hinge is added to the middle of the third rod section 14, allowing the armrest to be folded up 90 degrees to fit snugly against the backrest. The slide lock between the second and first rod sections is changed to a plug type (the plug passes through the first slide groove 22 and the hole in the side wall of the second rod section 24), eliminating the spring structure. The first and second mounting holes 10 and 27 are replaced with quick-release latches 30, which are compatible with the tubular frame of the wheelchair. The folding design reduces the wheelchair's width when moving in and out of spaces with obstacles, the plug lock is more solid and durable, and the quick-release interface allows for tool-free installation and removal.

[0028] In another embodiment (not shown), the first and second rod sections are changed to a three-stage sleeve structure (with a new intermediate casing), reducing the thickness after contraction by 40%. Instead of a manual slide, a micro-motor-driven gear rack is used (the rack is integrated into the first rod section 18, and the motor is installed in the second rod section 24). Touch buttons are embedded into the surface of the armrest to control the lift and angle memory functions. The maximum contraction saves cabin space, the electric adjustment enhances the high-end experience, and the preset memory modes adapt to different passenger needs.

[0029] In another embodiment (not shown), a hydraulic damper is added at the pivot connection between the third and second rod sections to achieve a slower return. The wall thickness of the first rod section 18 is increased, the protrusion 20 is replaced with a stainless steel ratchet, and the limiting rod 21 is upgraded to a steel claw. A nano-silver antibacterial coating is added to all metal components. A U-shaped assist pull ring is integrated into the end of the armrest. The hydraulic damping prevents the armrest from dropping too quickly when an invalid person sits up, the reinforced structure can support a weight of 100 kg or more, the antibacterial coating reduces the risk of infection, and the assist pull ring assists disabled people in getting up.

[0030] To sum up, the present invention achieves the following technical advantages: An armrest is attached to the upper end of the third rod section 14, a screw rod with a nut is passed through the first mounting hole 10 and screwed to the seat plate, and a screw rod with a nut is passed through the second mounting hole 27 and screwed to the backrest. When the backrest rotates relative to the seat plate, the third rod section 14 rotates in conjunction with the backrest, the second rod section 24 rotates in conjunction with the third rod section 14, and the third rod section 14 rotates relative to the second rod section 24, thereby synchronously adjusting the third rod section 14 in conjunction with the backrest. When it is desired to adjust the position of the second rod section 24 and the first rod section 18, pressing the second closing cap 11 causes the limiting rod 21 to move in conjunction with the second closing cap 11 toward the first closing cap 25, causing the second rod section 24 to slide, and the limiting rod 21 to move in conjunction with the second rod section 24. Once the movement is complete, loosening the second closing cap 11 causes the elastic member 23 to drive the limiting rod 21 to return, thereby restricting the position of the second rod section 24 and the first rod section 18 again, completing the position adjustment of the second rod section 24 and the first rod section 18.

[0031] In depicting this invention, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right," "sideways, lengthways, vertical, horizontal," and "top, bottom" are generally based on the directions or positional relationships shown in the drawings and are merely for the convenience and simplification of depicting this invention. Unless otherwise stated, these directional terms do not indicate or suggest that a device or component must have a specific orientation or be constructed or operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inside, outside" refer to the inside or outside of the contour of each component itself.

[0032] For convenience of depiction, spatially relative terms such as "above...," "upper...," "top of...," or "above" may be used herein to describe the spatial relationship of one component or feature to another component or feature, for example, as depicted in a figure. It should be understood that spatially relative terms are intended to encompass various orientations of use or operation other than the orientation in which the component is depicted in the figure. For example, if the components in the figures were turned upside down, a component previously described as "above other components or structures" or "on top of other components or structures" would then be positioned "below other components or structures" or "below other components or structures." Thus, the exemplary term "above..." can encompass both an orientation of "above..." and "below...." The location of the component may be expressed in other different ways (rotated 90 degrees or at other orientations), with corresponding explanations given for the spatially relative depictions used herein.

[0033] It should be noted that although the terms "first", "second", etc. are used to limit the components, this is to facilitate the distinction between corresponding components, and unless otherwise specified, the above terms do not have any special meaning, and therefore should not be understood as limiting the scope of protection of the present invention.

[0034] The above is only a preferred embodiment of the present invention, and does not limit the present invention, and those skilled in the art can make various modifications and changes to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. [Explanation of symbols]

[0035] 10 First mounting hole, 11 Second closing cap, 12 Connecting shaft, 13 Third mounting block, 14 Third rod section, 15 First installation hole, 16 First mounting block, 17 Second slide groove, 18 First rod section, 19 Groove, 20 Protrusion, 21 Limiting rod, 22 First slide groove, 23 Elastic member, 24 Second rod section, 25 First closing cap, 26 Force receiving rod, 27 Second mounting hole, 28 Second installation hole, 29 Annular ring, 30 Engagement claw, 31 Second mounting block

Claims

1. an armrest comprising a first rod portion, a second rod portion slidably fitted onto the outer periphery of the first rod portion, a third rod portion rotatably attached to one end of the second rod portion, a first mounting hole extending through the end of the first rod portion, the first rod portion being connected to a side surface of a chair seat via the first mounting hole, a second mounting hole extending through the end of the third rod portion, the third rod portion being connected to a side surface of a chair back via the second mounting hole, and when the chair back and seat rotate, the second rod portion and the third rod portion rotate.

2. The armrest of claim 1, characterized in that the first rod part comprises a first mounting block and a first rod section, the first mounting hole is drilled through the first mounting block, the first rod section has a hollow structure, a first sliding groove is drilled through both end faces of the first rod section, and one of the first sliding grooves has several protrusions fixed to both side walls.

3. The armrest of claim 2, wherein the second rod portion includes a second mounting block and a second rod section, the second rod section having a hollow structure, and the second rod section is slidably fitted onto the outer periphery of the first rod section.

4. The armrest of claim 3, characterized in that annular rings are fixed to both end faces of the second rod section, first mounting holes are drilled through both end faces of the second rod section, and the first mounting holes are drilled in the corresponding annular rings, and two second mounting holes are drilled through one end face of the second rod section, and the two second mounting holes are drilled on both sides of the first mounting holes, and the second mounting holes are drilled in the annular rings.

5. 5. The armrest of claim 4, wherein a first closing cap is mounted within the annular ring having the second mounting holes, and two engaging claws are fixed to one end of the first closing cap, which are inserted into the corresponding two second mounting holes; a second closing cap is mounted within the other annular ring, and a limiting rod is fixed to the end of the second closing cap near the second rod section, the limiting rod passes through the two first sliding grooves, and the two protrusions located on the same side of the first sliding groove or the protrusions and the side walls of the first sliding groove jointly engage with the limiting rod; grooves are formed on both ends of the limiting rod, which do not contact the protrusions; and an elastic member is connected between the limiting rod and the first closing cap.

6. The armrest of claim 2, wherein two force-receiving rods are provided on the inner wall of the second rod section, a second slide groove is provided at one end of the first rod section, and the two force-receiving rods are slidably mounted in the second slide groove.

7. The armrest of claim 2, characterized in that the third rod section includes two third mounting blocks and a third rod section, the third mounting block is fixedly mounted on one end of the third rod section, the second mounting block is rotatably mounted between the two third mounting blocks, and a connecting shaft is provided through the two third mounting blocks and the second mounting block.

8. 8. The armrest of claim 7, wherein the second mounting hole is drilled at the end of the third rod section.

9. a first rod portion for fixedly connecting to a seat of a chair; a second rod portion slidably fitted onto the outer periphery of the first rod portion; a third rod portion for fixed connection to the back of the chair and for pivotal connection to the second rod portion; a position limiting assembly provided between the first rod portion and the second rod portion, the position limiting assembly including a first slide groove and at least one protrusion formed in the first rod portion; a limiting rod passing through the first slide groove; an elastic member that drives the limiting rod to engage with the protrusion; An armrest including: An armrest in which sliding adjustment of the second rod portion relative to the first rod portion is achieved by pressing the limiting rod to disengage it.

10. The armrest of claim 9, wherein the first rod portion includes a first rod section, the second rod portion includes a second rod section, the first rod section is hollow, the first sliding groove is drilled through both end surfaces of the first rod section, the first sliding groove is arc-shaped, and the protrusion is provided on at least one side wall of the first sliding groove.

11. The armrest according to claim 10, wherein the protrusions are plural and spaced apart on the same side wall of the first sliding groove to form a multi-stage adjustment structure.

12. The armrest according to claim 9, wherein the limiting rod has grooves at both ends, and when the grooves are pressed and moved to a position where they are disengaged from the protrusions, the sliding adjustment is realized.

13. The armrest of claim 10, wherein the position limiting assembly further comprises a first closing cap and a second closing cap fixed to the second rod section, and the elastic member is connected to one end of the limiting rod and the other end is fixed to the second closing cap.

14. 14. The armrest according to claim 13, wherein the elastic member is a spring, both ends of which abut against the limiting rod and the first closing cap, respectively.

15. The armrest according to claim 13, wherein the second rod section is provided with an annular ring, and the first and second closing caps are both provided inside the annular ring.

16. The armrest of claim 15, wherein an engaging claw is provided at one end of the first closing cap, a second mounting hole is drilled on the end face of the second rod section, the second mounting hole is located inside the annular ring, and the engaging claw is engaged in the second mounting hole.

17. The armrest of claim 10, wherein an anti-derailment structure is provided between the first rod section and the second rod section, the anti-derailment structure including a second sliding groove formed in the first rod section and a force-receiving rod provided on the inner wall of the second rod section, the force-receiving rod and the second sliding groove both being arc-shaped, and the force-receiving rod sliding in the second sliding groove.

18. The armrest of claim 10, wherein the second rod portion further includes a second mounting block, the third rod portion includes a third mounting block, the third mounting block and the second mounting block are both disk-shaped, and further include a connecting shaft, and the second mounting block and the third mounting block are pivotally connected by having the connecting shaft pass through them.

19. The armrest according to claim 18, wherein the third rod portion further comprises a third rod section, and an end of the third rod section extends to form a support end for attaching the armrest.

20. 10. The armrest according to claim 9, wherein the cross-sectional shape of the protrusion is one of a trapezoid, a triangle, and a rectangle.

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