Adjustable chair

Abstract

An adjustable chair, comprising a chair seat, a chair back frame, a chair back plate, and two armrest structures. The chair back frame is pivotally connected to the chair seat and comprises two side plates. Each armrest structure comprises a fixing plate, a pin member, a stabilizing sleeve, and an armrest support. The fixing plate is fixed to the side plate and comprises a pivot hole. The armrest support is locked to the pin member. Rotation of the chair back frame by a first angle drives the armrest structures to rotate by a second angle, the second angle of the armrest structures being less than the first angle. Thereby, the convenience of use can be improved.

Description

Adjustable chair Technical Field

[0001] This invention relates to a chair, and more particularly to an adjustable chair with an armrest structure. Background Technology

[0002] The rise of health awareness has led to increased public attention to ergonomics. A typical chair consists of a seat, backrest, and armrests. The backrest is located on the seat, and the armrests are on the backrest. The chair can be adjusted to a reclining position, allowing the backrest to tilt backward. Since the position of the hands may differ between reclining and sitting positions, the armrests can be further adjusted to conform to ergonomic principles.

[0003] However, this method of adjusting the handrails requires manual adjustment by the user, which is not feasible for users with limited hands, and therefore there is still room for improvement.

[0004] Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an adjustable chair whose structural design enhances ease of use.

[0006] According to one embodiment of the present invention, an adjustable chair is provided. The adjustable chair includes a seat, a backrest frame, a backrest panel, and two armrest structures. The backrest frame is pivotally connected to the seat and includes two side panels. The backrest panel is movably disposed on the backrest frame. The two armrest structures are respectively pivotally connected to the two side panels, and each armrest structure includes a fixing plate, a pin, a stabilizing sleeve, and an armrest bracket. The fixing plate is fixed to each side panel and includes a pivot hole. The pin passes through the pivot hole. The stabilizing sleeve is fitted onto the pin. The armrest bracket is locked to the pin. When the backrest frame rotates relative to the seat by a first angle, it causes each armrest structure to rotate relative to the seat by a second angle, wherein the second angle of each armrest structure is smaller than the first angle.

[0007] According to the aforementioned embodiment of the adjustable chair, the first angle can be between 0 degrees and 80 degrees, and the second angle of each armrest structure can be between 0 degrees and 30 degrees.

[0008] The adjustable chair according to the aforementioned embodiment may further include a drive assembly and a drive rod. The drive assembly is disposed on the seat. The drive rod is connected to the drive assembly and one of the two side plates. The drive assembly drives the drive rod, causing the backrest frame to rotate relative to the seat.

[0009] According to the aforementioned embodiment of the adjustable chair, each side panel may include two tracks, and each fixed plate may further include a plate body, two sliding parts and two fixing members. The two sliding parts are connected to the plate body and are respectively accommodated in the two tracks, and the two fixing members are respectively inserted through the plate body and locked into the two sliding parts.

[0010] The adjustable chair according to the aforementioned embodiment may further include two linkages, each linkage including a first stud, a insertion rod, and a second stud. The first stud is disposed in one of the two armrest supports. One end of the insertion rod is into which the first stud is inserted. The second stud is disposed in the seat and inserted into the other end of the insertion rod.

[0011] According to the aforementioned embodiment of the adjustable chair, each armrest structure may further include annular components, each annular component being accommodated in each pivot hole, each annular component being sleeved on each pin and contacting each stabilizing component.

[0012] According to another embodiment of the present invention, an adjustable chair is provided. The adjustable chair includes a seat, a backrest frame, and two armrest structures. The backrest frame is pivotally connected to the seat and includes two side plates. The two armrest structures are respectively pivotally connected to the two side plates, and each armrest structure includes a fixing plate, a pin, a stabilizing sleeve, and an armrest bracket. The fixing plate is fixed to each side plate and includes a pivot hole. The pin passes through the pivot hole. The stabilizing sleeve is fitted onto the pin and is elastic. The armrest bracket is locked to the pin. The stabilizing sleeve is deformed by the pin, causing the backrest frame to rotate relative to the seat by a first angle, which in turn causes each armrest structure to rotate relative to the backrest frame by a second angle, the second angle being smaller than the first angle.

[0013] The adjustable chair according to the aforementioned embodiment may have a nylon body for the stabilizing kit.

[0014] According to the aforementioned embodiment of the adjustable chair, the first angle can be between 0 degrees and 80 degrees, and the second angle of each armrest structure can be between 0 degrees and 30 degrees.

[0015] The adjustable chair according to the aforementioned embodiment may further include a drive assembly and a drive rod. The drive assembly is disposed on the seat. The drive rod is connected to the drive assembly and one of the two side plates. The drive assembly drives the drive rod, causing the backrest frame to rotate relative to the seat. Attached Figure Description

[0016] Figure 1 illustrates a perspective view of an adjustable chair according to an embodiment of the present invention;

[0017] Figure 2 shows a partial exploded view of the adjustable chair according to the embodiment of Figure 1;

[0018] Figure 3 shows an exploded view of the handrail structure of the embodiment in Figure 1;

[0019] Figure 4 shows a cross-sectional view of the adjustable chair edge section line 4-4 of the embodiment in Figure 1:

[0020] Figure 5 shows a side view of the adjustable chair according to the embodiment of Figure 1.

[0021] Figure label:

[0022] 100: Adjustable Chair

[0023] 110: Chair seat

[0024] 120: Chair back frame

[0025] 121: Side panel

[0026] 1211: Track

[0027] 130: Chair backrest

[0028] 140: Handrail structure

[0029] 141: Fixing plate

[0030] 1411:Plate body

[0031] 1412: Convex column

[0032] 1413: Receptacle

[0033] 1413a: Bottom of the tank

[0034] 1414: Pivot

[0035] 1415: Sliding part

[0036] 1416: Fasteners

[0037] 142: Pin

[0038] 1421: Head

[0039] 1422: Threadless shank section

[0040] 1423: Threaded rod section

[0041] 143: Stability Kit

[0042] 144: Handrail support

[0043] 1441: Cover

[0044] 1442: Frame

[0045] 1443: Connecting pin

[0046] 145: Ring Kit

[0047] 150: Driver Components

[0048] 160: Drive lever

[0049] 161: Bending section

[0050] 162: Central Section

[0051] 163: Driving Department

[0052] 170: Linkage rod

[0053] 171: First Stud

[0054] 172: Insertion rod

[0055] 173: Second stud

[0056] 180: Headrest

[0057] A1: First Angle

[0058] A2: Second angle Detailed Implementation

[0059] Embodiments of the present invention will now be described with reference to the accompanying drawings. For clarity, many practical details will be set forth in the following description. However, the reader should understand that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity in the drawings, some known and conventional structures and components will be illustrated in a simple schematic manner; and repeated components may be denoted by the same or similar designations.

[0060] Furthermore, the terms "first," "second," and "third" used in this article are merely used to describe different components or ingredients, and do not impose any restrictions on the components / components themselves. Therefore, the first component / component can also be referred to as the second component / component. Moreover, the combinations of components / components / mechanisms / modules in this article are not combinations generally known, conventional, or known in this field. Whether the components / components / mechanisms / modules themselves are known cannot be used to determine whether their combination relationships are easily accomplished by someone with ordinary knowledge in the technical field.

[0061] Please refer to Figures 1 to 3. Figure 1 shows a perspective view of an adjustable chair 100 according to an embodiment of the present invention. Figure 2 shows a partial exploded view of the adjustable chair 100 of the embodiment of Figure 1. Figure 3 shows an exploded view of the armrest structure 140 of the embodiment of Figure 1. The adjustable chair 100 includes a seat 110, a backrest frame 120, a backrest panel 130, and two armrest structures 140.

[0062] The backrest frame 120 is pivotally connected to the seat 110 and includes two side panels 121. Two armrest structures 140 are pivotally connected to the two side panels 121 respectively. Each armrest structure 140 includes a fixing plate 141, a pin 142, a stabilizing component 143, and an armrest bracket 144. The fixing plate 141 is fixed to each side panel 121 and includes a pivot hole 1414. The pin 142 passes through the pivot hole 1414. The stabilizing component 143 is fitted onto the pin 142. The armrest bracket 144 is locked to the pin 142. When the backrest frame 120 rotates relative to the seat 110 by a first angle A1 (indicated in Figure 5), each armrest structure 140 rotates relative to the seat 110 by a second angle A2 (indicated in Figure 5). The second angle A2 of each armrest structure 140 is smaller than the first angle A1.

[0063] Specifically, the seat 110 is generally square, the backrest frame 120 is box-shaped, the backrest frame 120 is pivotally connected to the rear edge of the seat 110, and the backrest panel 130 is movably disposed on the side of the backrest frame 120 adjacent to the seat 110, for use as a backrest by the user. The adjustable chair 100 may further include a headrest 180, which is disposed on the upper edge of the backrest panel 130, and the position and angle of the headrest 180 are adjustable to suit the user's needs. It should be noted that the adjustable chair 100 of this invention may have a wheelchair structure, and therefore may include a base frame and multiple wheels. The seat 110 may be disposed on the base frame, and the number of wheels may be, for example, four and disposed under the base frame. For the sake of simplicity, the base frame and wheels are omitted in this invention, but this does not limit the invention. Furthermore, in other embodiments, the adjustable chair may also be a general chair and include multiple chair legs, and is not limited thereto.

[0064] As shown in Figures 1 and 2, the adjustable chair 100 may further include a drive assembly 150 and a drive rod 160. The drive assembly 150 is disposed on the seat 110. The drive rod 160 is connected to the drive assembly 150 and one of the two side plates 121. The drive assembly 150 drives the drive rod 160, causing the backrest frame 120 to rotate relative to the seat 110.

[0065] The drive assembly 150 may be, for example, an electric cylinder and includes a push rod (not shown). The drive rod 160 may include a bent rod portion 161, a central portion 162, and a driving portion 163. The push rod is pivotally disposed at one end of the bent rod portion 161, the other end of the bent rod portion 161 is integrally disposed at the central portion 162, the central portion 162 is pivotally disposed at the seat 110, one end of the driving portion 163 is integrally disposed at the central portion 162, and the other end of the driving portion 163 is disposed at the side plate 121. When the push rod retracts, the drive rod 160 pivots clockwise around the center part 162, and the drive part 163 drives the side plate 121, which in turn causes the chair back frame 120 and the chair backrest 130 to recline relative to the seat 110. When the push rod extends, the drive rod 160 pivots counterclockwise around the center part 162, and the drive part 163 drives the side plate 121, which in turn causes the chair back frame 120 and the chair backrest 130 to stand upright relative to the seat 110.

[0066] The adjustable chair 100 may further include a backrest panel 130, which is movably mounted on the backrest frame 120. The adjustable chair 100 may include a linkage assembly (not shown) pivotally connecting the backrest frame 120 and the backrest panel 130 and pivotally connected to the seat 110. When the drive assembly 150 actuates to pivot the backrest frame 120, the backrest panel 130 can move relative to the backrest frame 120. In this way, when the backrest frame 120 is tilted relative to the seat 110, the backrest panel 130 can move to accommodate the user's back, achieving the purpose of not pulling on the user's back, thereby improving user comfort.

[0067] The following description uses one side only in this embodiment, but the invention is not limited thereto. As shown in Figures 1 and 3, the side plate 121 may include two tracks 1211, and the fixing plate 141 may further include a plate body 1411, two sliding parts 1415 and two fixing members 1416. The two sliding parts 1415 are connected to the plate body 1411 and are respectively accommodated in the two tracks 1211. The two fixing members 1416 pass through the plate body 1411 and are locked into the two sliding parts 1415.

[0068] Two tracks 1211 are recessed into the surface of the side plate 121, and the length extension direction of the two tracks 1211 is parallel to the length extension direction of the side plate 121. In this embodiment, the number of sliding parts 1415 and fixing members 1416 can be four. Each sliding part 1415 is a square block with a screw hole structure at the center. Two sliding parts 1415 are located on one track 1211, and the other two sliding parts 1415 are located on another track 1211. Each fixing member 1416 can have a screw structure, and the four fixing members 1416 pass through the four corners of the plate 1411 and lock into the four sliding parts 1415, thereby locking the plate 1411 to the side plate 121. It should be noted that after the fixing members 1416 are loosened, the handrail structure 140, including the fixing plate 141, can be slid along the length extension direction of the track 1211 to adjust the position of the handrail structure 140.

[0069] Please refer to Figure 4, and also to Figures 1 to 3. Figure 4 shows a cross-sectional view of the adjustable chair 100 of the embodiment of Figure 1 along section line 4-4. The fixing plate 141 may further include a protrusion 1412 and a receiving groove 1413. The protrusion 1412 is a circular cylinder that integrally protrudes from the plate 1411 and through which the pivot hole 1414 passes. The receiving groove 1413 is recessed in the plate 1411 and faces each side plate 121. The receiving groove 1413 includes a groove bottom 1413a and communicates with the pivot hole 1414. The pin 142 may pass through the receiving groove 1413 first and then through the pivot hole 1414. Specifically, the pin 142 may include a head 1421, a threadless shank 1422, and a threaded shank 1423. The head 1421 is located in the receiving groove 1413. One end of the threadless shank 1422 is connected to the head 1421, and the threaded shank 1423 is connected to the other end of the threadless shank 1422. The head 1421 may be located in the receiving groove 1413, and the side of the head 1421 adjacent to the threadless shank 1422 may press against the bottom 1413a of the receiving groove 1413. The threaded shank 1423 then passes through the pivot hole 1414 and exits the plate 1411.

[0070] The handrail structure 140 may further include an annular assembly 145, which is received in the pivot hole 1414, sleeved on the pin 142, and contacts the stabilizing assembly 143. Specifically, the annular assembly 145 is a hollow cylindrical assembly through which the threadless rod portion 1422 of the pin 142 passes, and because the inner diameter of the annular assembly 145 is slightly larger than the outer diameter of the threadless rod portion 1422, the threadless rod portion 1422 can rotate relative to the annular assembly 145. In this embodiment, the annular assembly 145 may be a copper sleeve, and the stabilizing assembly 143 may be elastic and have a nylon body; that is, the stabilizing assembly 143 is a component made of nylon. The stabilizing assembly 143 deforms under pressure, thus absorbing shock for the handrail structure 140. In other embodiments, the stabilizing assembly may be made of any elastic material, such as plastic steel or soft metal, but is not limited thereto.

[0071] Referring to Figure 3, the handrail bracket 144 may further include a cover 1441. The cover 1441 includes a groove (not shown) and a screw hole (not shown). The groove is recessed into the surface of the cover 1441, and its inner diameter is slightly larger than the protrusion 1412 of the fixing plate 141. Therefore, the groove allows the protrusion 1412 to be inserted into it. Since the screw hole is located within the groove, the threaded portion 1423 of the pin 142 can be locked into it. This allows the handrail bracket 144 to be mounted on the fixing plate 141.

[0072] When the backrest frame 120 and the fixing plate 141 rotate, since the threadless shank 1422 and the head 1421 of the pin 142 are only pivotally mounted on the fixing plate 141, the fixing plate 141 does not drive the pin 142 to rotate, and the armrest structure 140 can therefore rotate relative to the backrest frame 120. The armrest bracket 144 may further include a frame 1442 and a connecting pin 1443. The frame 1442 can be connected to the cover 1441 via the connecting pin 1443, and the frame 1442 can pivot relative to the cover 1441.

[0073] As shown in Figure 2, the adjustable chair 100 may further include two linkages 170, each linkage 170 including a first stud 171, an insertion rod 172, and a second stud 173. Each first stud 171 is disposed on each armrest bracket 144. One end of the insertion rod 172 is into which one end of the first stud 171 is inserted. One end of the second stud 173 is disposed on the seat 110, and the other end of the second stud 173 is inserted into the other end of the insertion rod 172.

[0074] Specifically, two linkages 170 are respectively disposed on both sides of the adjustable chair 100 and can support the armrest structure 140. The following description focuses on one side, but does not limit the invention. The first stud 171 and the second stud 173 are threaded and can be locked to the two ends of the insertion rod 172 respectively. The cover 1441 can be connected to the other end of the first stud 171, and the aforementioned end of the second stud 173 is pivotally disposed on the seat 110. When the backrest frame 120 and the armrest structure 140 rotate relative to the seat 110, the first stud 171, the insertion rod 172 and the second stud 173 can be rotated together. It should be noted that when adjusting the position of the armrest structure 140, the sliding part 1415 and the fixing part 1416 must be moved along the length extension direction of the side plate 121. At this time, the length of the linkage rod 170 must also be adjusted accordingly. For example, when the armrest structure 140 is close to the seat 110 along the length extension direction of the side plate 121, the first stud 171 and the second stud 173 can be rotated to insert the rod 172, thereby shortening the length of the linkage rod 170. Conversely, when the armrest structure 140 is far away from the seat 110 along the length extension direction of the side plate 121, the first stud 171 and the second stud 173 can be rotated to move away from the rod 172, thereby increasing the length of the linkage rod 170. In addition, the angle of the armrest structure 140 can be finely adjusted by shortening or lengthening the linkage 170. When the length of the linkage 170 is shortened, the angle of the armrest structure 140 relative to the seat 110 increases, and when the length of the linkage 170 is lengthened, the angle of the armrest structure 140 relative to the seat 110 decreases.

[0075] Please refer to Figure 5, and also to Figures 1 through 4. Figure 5 shows a side view of the adjustable chair 100 of the embodiment in Figure 1. When the drive assembly 150 rotates the backrest frame 120 via the drive rod 160, the armrest structure 140 and the backrest frame 120 may not rotate at the same angle because the armrest structure 140 is pivotally mounted on the backrest frame 120.

[0076] Specifically, in an initial state, the adjustable chair 100 has a backrest frame 120 at an angle of 85 degrees relative to the seat 110, and an armrest structure 140 at an angle of 5 degrees relative to the seat 110. During reclining, when the backrest frame 120 rotates, the armrest structure 140 rotates simultaneously, but the seat 110 remains horizontal and is not affected by either the backrest frame 120 or the armrest structure 140. The angle of rotation of the backrest frame 120 relative to the seat 110 is a first angle A1 (in this embodiment, since the seat 110 remains horizontal, the angle of rotation of the backrest frame 120 is the first angle A1). The first angle A1 is between 0 and 80 degrees, so the maximum angle of rotation of the backrest frame 120 relative to the seat 110 can be 165 degrees; each armrest structure 140 rotates relative to the seat 110. The angle of movement is the second angle A2 (in this embodiment, since the seat 110 is kept horizontal, the angle of rotation of each armrest structure 140 is the second angle A2). The second angle A2 of each armrest structure 140 is between 0 degrees and 30 degrees. Therefore, the angle between the backrest frame 120 and the seat 110 can be up to 35 degrees. At any time, the second angle A2 is less than the first angle A1. The armrest structure 140 can therefore be positioned in a position suitable for the user's hand placement, which is ergonomic. In addition, since there is no need to manually adjust the armrest structure 140, it helps to improve the convenience of the user.

[0077] As can be seen from the above embodiments, this invention has the following advantages: First, when the backrest frame rotates, it can simultaneously move the armrest structure, allowing the armrest structure to automatically rotate to a more suitable position, thereby improving ease of use and comfort; and second, by making the stabilizing components elastic, vibrations can be further avoided when the armrest structure rotates.

[0078] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An adjustable chair, characterized in that, Include: Seat; The backrest frame is pivotally connected to the seat and includes two side panels; A chair backrest panel, movably mounted on the chair back frame; and Two handrail structures are pivotally connected to the two side panels, and each of the two handrail structures includes: A fixing plate, fixed to each of the two side plates and including a pivot hole; A pin is inserted through the pivot hole; The stabilizing kit is fitted onto the pin; and The handrail bracket is locked to the pin. The backrest frame rotates a first angle relative to the seat, which in turn causes each of the two armrest structures to rotate a second angle relative to the seat. The second angle of each of the two armrest structures is smaller than the first angle.

2. The adjustable chair as described in claim 1, characterized in that, The first angle is between 0 degrees and 80 degrees, and the second angle of each of the two handrail structures is between 0 degrees and 30 degrees.

3. The adjustable chair as described in claim 1, characterized in that, It also includes: Drive components, disposed on the seat; and A drive rod is connected to the drive assembly and one of the two side plates; The drive assembly drives the drive rod, causing the chair back frame to be positioned relative to... The chair seat rotates.

4. The adjustable chair as described in claim 1, characterized in that, Each of the two side plates includes two tracks, and each of the two fixed plates further includes a plate body, two sliding parts and two fixing members. The two sliding parts are connected to the plate body and are respectively accommodated in the two tracks. The two fixing members are respectively inserted through the plate body and locked into the two sliding parts.

5. The adjustable chair as described in claim 1, characterized in that, It also includes two linkages, each of which contains: The first stud is installed on one of the two handrail supports; An insertion rod, one end of which is used for inserting the first stud; as well as The second stud is disposed on the seat and inserted into the other end of the insertion rod.

6. The adjustable chair as described in claim 1, characterized in that, Each of the two handrail structures further includes a ring-shaped assembly, each of the two ring-shaped assemblies being accommodated in each of the two pivot holes, and each of the two ring-shaped assemblies being fitted onto each of the two pins and contacting each of the two stabilizing assemblies.

7. An adjustable chair, characterized in that, Include: Seat; A backrest frame, pivotally connected to the seat and comprising two side panels; and Two handrail structures, pivotally connected to the two side panels, each of the two handrails Hand structures include: A fixing plate, fixed to each of the two side plates and including a pivot hole; A pin is inserted through the pivot hole; A stabilizing kit, fitted onto the pin, and the stabilizing kit being flexible; and The handrail bracket is locked to the pin. The stabilizing kit is deformed by the pin, causing the backrest frame to rotate at a first angle relative to the seat, which in turn causes each of the two armrest structures to rotate at a second angle relative to the backrest frame, the second angle being smaller than the first angle.

8. The adjustable chair as described in claim 7, characterized in that, This stabilization kit has a nylon body.

9. The adjustable chair as described in claim 7, characterized in that, The first angle is between 0 degrees and 80 degrees, and the second angle of each of the two handrail structures is between 0 degrees and 30 degrees.

10. The adjustable chair as described in claim 7, characterized in that, It also includes: Drive components, disposed on the seat; and A drive rod is connected to the drive assembly and one of the two side plates; The drive assembly drives the drive rod, causing the backrest frame to rotate relative to the seat.

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