Armrest folding mechanism

Abstract

This invention provides an armrest folding mechanism that reduces the overall packaging volume by folding the armrests. [Solution] The armrest folding mechanism is configured such that the armrests 2 are pivotally attached to fixed protrusions 11 provided on both sides of the chair's backrest tube, and a folding mechanism 3 is disposed between the fixed protrusions and the armrests. The folding mechanism includes a fitting cylinder 31, a pivot 32, an elastic member 33, and a locking pin 34. The fitting cylinder is coupled to the corresponding fixed protrusions, and the armrest is fitted to the outside of it. The fitting cylinder has an internal space 311. An axial hole 312 is formed in the end face of the internal space. A track 313 that slides and displaces the armrest 2 is provided around the surface of the fitting cylinder. The track includes an upward rotation path 313a, an outward movement path 313b, a downward rotation path 313c, and a return path 313d.

Description

Technical Field

[0001] The present invention relates to the field of chair armrests, in particular to an armrest folding mechanism.

Background Art

[0002] Conventionally, in order to improve safety when a person sits on a chair, armrests are respectively fixed to two side surfaces of a seat in some chairs to prevent the sitter from falling over. Taking a chair as an example, it includes four legs supported on the floor, a seat is provided at the top of the four legs, two support rods extending backward and then curving upward are provided below the seat, a backrest located above the rear side of the seat is fixed to the top of the two support rods, and armrests are further fixed by extending upward from the two side surfaces of the seat respectively.

[0003] However, since the aforementioned chair armrests are designed to be fixed, although they can provide users with a good effect of supporting hands and arms, they have the following disadvantages (1) and (2). (1) When the user stands up, the user is restricted by the armrests provided on the two side surfaces and cannot stand up and move away from the side. (2) Since the armrests cannot be folded for storage, the volume is large. When transporting the product, problems such as large packaging volume and large space occupation tend to result in high transportation costs.

[0004] Therefore, based on the supreme concept of making the product more perfect, with the help of years of manufacturing design experience and knowledge in the related field, the inventor of the present invention devised the armrest folding mechanism of the present invention after various researches and experiments.

Summary of the Invention

Problem to be Solved by the Invention

[0005] The main objective of this invention is to provide an armrest folding mechanism that reduces the overall packaging volume by folding the armrest. [Means for solving the problem]

[0006] To solve the above problems, according to the first embodiment of the present invention, an armrest folding mechanism is provided in which armrests are pivotally attached to fixed protrusions provided on both sides of the backrest tube of a chair, and a folding mechanism is disposed between the fixed protrusions and the armrest, wherein the folding mechanism includes a fitting cylinder, a pivot, an elastic member and a lock pin, the fitting cylinder is coupled to the fixed protrusions in correspondence and the armrest is fitted to the outside, the fitting cylinder has an internal space, an axial hole is formed in the end face of the internal space and the surface of the fitting cylinder has the arm The present invention provides an armrest folding mechanism characterized in that a track for sliding displacement of the armrest is provided around the armrest, the track includes an upward rotation path, an outward movement path, a downward rotation path, and a return path, the pivot is inserted in correspondence with the internal space of the fitting cylinder, the shaft hole, and the armrest, the armrest is pivotally mounted and positioned on the fitting cylinder, the elastic member is fitted in correspondence with the pivot and is located in the internal space of the fitting cylinder, and the lock pin is inserted from the armrest into the fitting cylinder and is located on the track, and is capable of sliding displacement on the track.

[0007] Preferably, the pivot has a shaft sleeve fitted to its outside, and a contact piece is provided at one end, the contact piece contacting the elastic member, and the elastic member being fixed in position within the internal space.

[0008] Preferably, a cover is provided at the open end of the internal space to close the internal space. [Effects of the Invention]

[0009] The armrest folding mechanism according to this invention can reduce the overall packaging volume by folding the armrest. [Brief explanation of the drawing]

[0010] [Figure 1] This is an exploded perspective view showing an armrest folding mechanism according to one embodiment of the present invention. [Figure 2] This is an assembled perspective view showing an armrest folding mechanism according to one embodiment of the present invention. [Figure 3] This is a cross-sectional view showing the armrest of an armrest folding mechanism according to one embodiment of the present invention in a horizontal position. [Figure 4] This is a perspective view showing the armrest of an armrest folding mechanism according to one embodiment of the present invention in a horizontal position. [Figure 5] This is a cross-sectional view showing the vertical position of the armrest of an armrest folding mechanism according to one embodiment of the present invention, rotated upward. [Figure 6] This is a perspective view showing the vertical position of the armrest of an armrest folding mechanism according to one embodiment of the present invention, rotated upward. [Figure 7] This is a cross-sectional view showing the state in which the armrest of an armrest folding mechanism according to one embodiment of the present invention is rotated upward and slid outward. [Figure 8] This is a perspective view showing the state in which the armrest of an armrest folding mechanism according to one embodiment of the present invention is rotated upward and slid outward. [Figure 9] This is a cross-sectional view showing the state in which the armrest of an armrest folding mechanism according to one embodiment of the present invention has been rotated downward and returned to its original position. [Figure 10] This is a perspective view showing the state in which the armrest of an armrest folding mechanism according to one embodiment of the present invention has been rotated downward and returned to its original position. [Modes for carrying out the invention]

[0011] In order to more completely and clearly disclose the technical details, purpose, and effects achieved in this invention, they will be described in detail below. For further reference, please refer to the accompanying drawings and reference numerals disclosed herein.

[0012] First, please refer to FIG. 1 and FIG. 2. FIG. 1 is an exploded perspective view showing an armrest folding mechanism according to an embodiment of the present invention. FIG. 2 is an assembled perspective view showing an armrest folding mechanism according to an embodiment of the present invention.

[0013] As shown in FIG. 1 and FIG. 2, in the armrest folding mechanism 3 according to an embodiment of the present invention, armrests 2 are respectively pivotally mounted on fixed convex seats 11 provided on both sides of a backrest tube 1 of a chair. A folding mechanism 3 is disposed between the fixed convex seat 11 and the armrest 2. The folding mechanism 3 comprises a fitting cylinder 31, a pivot shaft 32, an elastic member 33 and a lock pin 34.

[0014] The fitting cylinder 31 is correspondingly coupled onto the fixed convex seat 11, and the armrest 2 is fitted onto the outer side thereof. The fitting cylinder 31 has an internal space 311, and a shaft hole 312 is formed on an end face of the internal space 311. A track 313 for sliding displacement of the armrest 2 is provided around the surface of the fitting cylinder 31. The track 313 comprises an upward rotating path 313a, an outward moving path 313b, a downward rotating path 313c and a return path 313d.

[0015] The pivot shaft 32 is inserted corresponding to the internal space 311 of the fitting cylinder 31, the shaft hole 312 and the armrest 2, and the armrest 2 is pivotally mounted on the fitting cylinder 31 and positioned.

[0016] The elastic member 33 is correspondingly fitted onto the pivot shaft 32 and is located in the internal space 311 of the fitting cylinder 31.

[0017] The lock pin 34 is inserted from the armrest 2 into the fitting cylinder 31 and located on the track 313, and can perform sliding displacement on the track 313.

[0018] Refer to Figures 1 to 10. As shown in Figures 1 to 10, the armrest folding mechanism according to the present invention is installed on any type of chair that requires an armrest when actually used. An inner fitting hole 21 into which a fitting cylinder 31 is fitted is formed at one end of the armrest 2. The internal fitting hole 21 has a locking hole 22 formed on its wall surface for screwing in the locking pin 34, and a perforation 23 formed on its end surface for inserting and assembling the pivot 32. The assembly is completed by inserting the pivot 32 through the open end of the internal space 311 of the fitting cylinder 31, fitting the elastic member 33 onto the pivot 32, and then further inserting it through the internal space 311 of the fitting cylinder 31, the shaft hole 312, and the perforation 23 of the armrest 2 to pivot and position it. The pivot 32 has a shaft sleeve 35 fitted to its outside, and a contact piece 36 provided at one end. The contact piece 36 is brought into contact with the elastic member 33, thereby restraining the elastic member 33 in position within the internal space 311. Furthermore, a cover 37 is provided at the open end of the internal space 311 to close the internal space 311. The armrest 2 is then installed on the chair's backrest tube 1 via the structure described above, and the lock pin 34 is screwed into the lock hole 22 of the armrest 2 and inserted into the track 313 of the fitting cylinder 31.

[0019] When a user is seated in a chair and using the armrest 2, the lock pin 34 on the armrest 2 is positioned at the starting end of the upward rotation path 313a of the track 313, supporting the user's elbow in a horizontal position (see Figures 3 and 4). As shown in Figures 5 and 6, when the armrest 2 is rotated upward and moved, the lock pin 34 moves along the upward rotation path 313a of the track 313, and the armrest 2 moves upward from the horizontal position to the vertical position, but the upward rotation path 313a moves from top to bottom (opposite direction). The angle range of Armrest 2, from horizontal to vertical, can meet the user's everyday support needs and allows for easy standing from the side, thus expanding its range of use.

[0020] Next, refer to Figures 7 and 8. As shown in Figures 7 and 8, when folding the armrest 2, the armrest 2, which is held at a vertical angle, slides naturally backward and outward. At this time, the lock pin 34 on the armrest 2 moves along the outward movement path 313b of the track 313, displacing the armrest 2 outward relative to the fitting cylinder 31, and the pivot 32 moves outward with the armrest 2, compressing the elastic member 33. This series of motions moves the armrest 2 outward, avoiding the chair's backrest tube 1, and eliminates the space in which the chair's backrest tube 1 would obstruct the downward rotational movement of the armrest 2. Next, the lock pin 34 on the armrest 2 is advanced along the downward rotation path 313c of the track 313, causing the armrest 2 to fold downward. Finally, the elastic recovery force of the elastic member 33 advances the lock pin 34 along the return path 313d, returning the armrest 2 to its inward position (see Figures 9 and 10).

[0021] The armrest 2 in this embodiment can be moved from a horizontal to a vertical position via the upward rotation path 313a, outward movement path 313b, downward rotation path 313c, and return path 313d of the track 313, and can also be rotated and folded downward to reduce the overall volume of the chair, thereby saving space and reducing transportation costs when loading and transporting goods, and providing the effect of convenient transportation.

[0022] The above-described embodiments or drawings are not intended to limit the form, structure, or method of use of the product of this invention, and appropriate modifications or alterations by persons with ordinary skill in the art should also be considered to be included in the scope of the utility model registration claims of this invention.

[0023] As can be seen from the above-described structural composition and usage of the present invention, the present invention has the following advantages (1) to (3) compared to conventional structures.

[0024] (1) The technology of folding the armrests downwards effectively reduces the overall volume of the chair, thereby increasing the load capacity for product transport, saving on transportation costs, and effectively reducing overall costs. (2) The armrests can be moved within an angle range from horizontal to vertical to meet the user's everyday support needs, allowing them to stand up from the side and expanding the range of use. (3) Primarily for convenient folding and storage, the armrest is flipped up to the rear, slid outwards, rotated backward and moved downward, and then slid back into place. This series of movements is designed primarily to prevent the armrest from interfering with the lower part of the chair's backrest tube.

[0025] In summary, the embodiments of this invention can reliably achieve the expected effects of use, and the specific structure disclosed is not only unique to this product but has also not been publicly disclosed prior to filing, thus fully satisfying the provisions and requirements of the Utility Model Law. Therefore, in accordance with the law, we hereby file this application for registration of a utility model. [Explanation of symbols]

[0026] 1. Chair backrest tube 2 Armrests 3. Folding mechanism 11 Fixed convex seat 21 Inner hole 22 locking holes 23 perforation 31 Fitting cylinder 32 Axis 33 Elastic members 34 lock pins 35 Axis Sleeve 36 Contact piece 37 Cover 311 Interior space 312 Shaft hole 313 orbit 313a Upward rotation path 313b Outward migration path 313c Downward rotation path 313d Reversion route

Claims

1. An armrest folding mechanism is provided, wherein armrests are pivotally attached to fixed protrusions on both sides of the chair's backrest tube, and a folding mechanism is disposed between the fixed protrusions and the armrests. The folding mechanism includes a fitting cylinder, a pivot, an elastic member, and a locking pin. The fitting cylinder is coupled to the fixed protrusion, and the armrest is fitted to the outside of it. The fitting cylinder has an internal space, and an axial hole is formed in the end face of the internal space. A track for sliding displacement of the armrest is provided around the surface of the fitting cylinder, and the track includes an upward rotation path, an outward movement path, a downward rotation path, and a return path. The pivot is inserted in accordance with the internal space of the fitting cylinder, the shaft hole, and the armrest, and the armrest is pivotally positioned on the fitting cylinder. The elastic member is fitted onto the pivot and located in the internal space of the fitting cylinder, An armrest folding mechanism characterized in that the locking pin is inserted from the armrest into the fitting cylinder and positioned on the track, and is capable of sliding displacement on the track.

2. The aforementioned pivot has a shaft sleeve fitted to the outside and a contact piece provided at one end. The armrest folding mechanism according to claim 1, characterized in that the contact piece is brought into contact with the elastic member, thereby restricting the position of the elastic member within the internal space.

3. The armrest folding mechanism according to claim 2, characterized in that a cover for closing the internal space is provided at the open end of the internal space.

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