Folding chair frame

Abstract

The utility model relates to a folding chair frame, which comprises two side brackets which are bilaterally symmetrical, and a front cross support rod group and a rear cross support rod group which are positioned on a front vertical surface and a rear vertical surface, and each side bracket comprises a front foot rod, a rear foot rod, a backrest rod and a seat rod; the upper end and the lower end of the front crossed supporting rod group are rotatably pivoted to the front end of the seat rod and the lower end of the front foot rod respectively; the upper end and the lower end of the rear crossed supporting rod group are rotatably pivoted to the upper end of the front foot rod and the lower end of the rear foot rod respectively; the seat rod is pivoted on the front foot rod and the rear foot rod in sequence; the front foot rod inclines backwards from bottom to top, the rear foot rod inclines forwards from bottom to top, the upper end of the rear foot rod abuts against the unfolded front foot rod and is in pivot joint with the front foot rod, a pivot joint seat is arranged at the upper end of the front foot rod in a pivot joint mode, and the backrest rod is in pivot joint with the pivot joint seat. The folding chair frame is simple in structure, convenient to operate and stable in supporting.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chair, more particularly to a folding chair frame. BACKGROUND

[0002] Folding chairs are widely used in various public places or as outdoor chairs due to their portability, foldability, convenience in moving and space saving. Common folding chairs include a chair frame and a chair cloth connected thereto, and can be folded as a whole. Some folding chairs also have a backrest, and the chair frame includes a backrest rod and a backrest cloth that can be unfolded and folded simultaneously.

[0003] For folding chairs with a backrest rod, the backrest is usually fixed, and the backrest rod is unfolded and folded together with the chair frame. Some folding chairs with a backrest include two backrest rods located at the rear side of the chair frame. The backrest rod is usually a straight rod. To reduce the length of the backrest rod and the inclination of the backrest, some chair frames are designed to connect a backrest rod to a support rod located at the rear side, such as a backrest rotating folding chair disclosed in Chinese Patent Application No. 201820633896.0, a fully collapsible folding chair with a movable backrest disclosed in Chinese Patent Application No. 202121343310.5, and a folding chair frame with an adjustable backrest disclosed in Chinese Patent Application No. 202320143993.2. In these existing folding chairs, the backrest rod is connected to the upper end of a support rod located at the rear side (rear leg rod), and the support rod is positioned as a rear support rod. The rear support rod serves as a rear support for the chair frame. The upper section of the rear support rod forms a backrest section. For these folding chairs, since the backrest rod is connected to the rear support rod, when the user leans back during use, the force is applied to the backrest rod, which causes the center of gravity of the seat to move backward, resulting in instability of the center of gravity. In addition, in the leaning-back state, the seat is unstable, which affects the user experience and may cause safety hazards. Furthermore, to accommodate the folding of the rod, the rear support rod needs to be designed as a telescopic tube, which complicates the structure and increases the cost. SUMMARY

[0004] The utility model aims at providing a folding chair frame with simple structure, convenient operation and stable support.

[0005] To achieve the above-mentioned purpose, the solution of the utility model is as follows:

[0006] The folding chair frame comprises two symmetrical side frames and front and rear cross rod groups, each side frame comprises a front leg rod, a rear leg rod, a back rod and a seat rod, the upper and lower ends of the front cross rod group are pivotally connected to the front end of the seat rod and the lower end of the front leg rod, the upper and lower ends of the rear cross rod group are pivotally connected to the upper end of the front leg rod and the lower end of the rear leg rod, the seat rod is sequentially pivotally connected to the front leg rod and the rear leg rod, the front leg rod is inclined backward from bottom to top, the rear leg rod is inclined forward from bottom to top, the upper end of the rear leg rod is abutted against the unfolded front leg rod and pivotally connected to the front leg rod, the upper end of the front leg rod is pivotally provided with a pivot seat, the back rod is pivotally connected to the pivot seat, further, the pivot seat is provided with a connecting groove for the pivot connection of the back rod, the connecting groove is formed with an abutment surface for the backward inclination of the back rod.

[0007] Further, the lower section of the back rod is formed with a straightening section with a smaller upward angle after being bent.

[0008] Further, the upper end of the front leg rod is formed with an upper supporting section with a smaller upward angle after being bent forward.

[0009] Further, the chair frame is further provided with a front supporting rod, the upper end of the front supporting rod is pivotally connected to the front end of the seat rod, and the lower end of the front supporting rod is slidably connected to the front leg rod.

[0010] Further, the chair frame is further provided with a handrail assembly, the handrail assembly comprises a handrail rod and a handrail supporting rod, the handrail supporting rod is formed by extending upward from the upper end of the front supporting rod, the upper end of the handrail supporting rod is pivotally connected to and supported under the front end of the handrail rod, the handrail rod is located above the seat rod and staggered with the seat rod, and the rear end of the handrail rod is pivotally connected to the front leg rod or the rear leg rod.

[0011] Further, the lower end of the front supporting rod is pivotally connected to a sliding sleeve which can slide on the front leg rod, the front end of the seat rod is pivotally connected to a supporting seat, the upper end of the front supporting rod is arranged in the supporting seat, the upper end of the front cross rod group is pivotally connected to the supporting seat, and the front end of the seat rod is supported in the supporting seat when the chair frame is unfolded.

[0012] Further, the upper end of the rear leg rod is connected to a supporting member, the supporting member is formed with a supporting groove, the front leg rod is inclined and supported in the supporting groove when the chair frame is unfolded, the rear end of the handrail rod is pivotally connected to the side surface of the supporting member, a pair of symmetrical connecting strips are pivotally connected to the supporting member, the upper end of the rear leg rod is pivotally connected to the front leg rod through the connecting strips, one end of the connecting strip is pivotally connected to the supporting member, the other end of the connecting strip is pivotally connected to the front leg rod, and the connecting strip connected to the front leg rod is rotated upward with the front leg rod when the chair frame is folded.

[0013] Furthermore, a support member is connected to the upper end of the rear leg, and a support groove is formed on the support member. The front leg is pivotally connected to the support member and tilts and supports itself in the support groove when the chair frame is unfolded. The rear ends of the armrests are pivotally connected to the front leg and are located above the support member. An adjustment groove block is connected to the bottom surface of each armrest. A sliding groove is provided in the adjustment groove block along the length of the armrest. The upper end of the armrest support rod is pivotally connected to the sliding groove and slides.

[0014] Furthermore, the two sides of the adjusting block are provided with grooves, and a pin passes through both the grooves and the upper end of the armrest support rod; the rear end of the seat rod is pivotally connected to the inner side of a connecting sleeve, the connecting sleeve is connected to the rear foot rod and located below the support member, and a first limiting sleeve connected to the rear foot rod is also provided above the connecting sleeve, and a second limiting sleeve is also connected to the front support rod and located below the support seat.

[0015] With the above structure, this utility model incorporates a backrest bar in the folding chair frame that provides stable support and comfortable reclining. The overall chair frame is more stable during use, greatly improving the user experience. Furthermore, there is no need to increase the length of the front or rear legs in the chair frame, allowing for smooth and convenient unfolding and folding. The chair frame structure is simple and easy to use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the first embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the first embodiment of the present invention in a semi-folded state;

[0018] Figure 3 This is a schematic diagram of the folded state of the first embodiment of the present invention;

[0019] Figure 4 This is a three-dimensional structural diagram of the second embodiment of the present utility model. Detailed Implementation

[0020] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0021] Combination Figures 1 to 3As shown, this utility model discloses a folding chair frame, which includes two symmetrical side supports, and a front cross support group and a rear cross support group located on the front and rear facades, respectively. Each side support includes a front leg rod 1, a rear leg rod 2, a backrest rod 3, and a seat rod 4. The upper and lower ends of the front cross support group are rotatably pivotally connected to the front end of the seat rod 4 and the lower end of the front leg rod 1, respectively. The upper and lower ends of the rear cross support group are rotatably pivotally connected to the upper end of the front leg rod 1 and the lower end of the rear leg rod 2, respectively. In this example, the front cross support group includes two intersecting front support rods 51, and the rear cross support group includes two intersecting rear support rods 52. A support base 41 is pivotally connected to the front end of the seat rod 4. The upper ends of the two front support rods 51 are rotatably pivotally connected to the support base 41, and the lower ends of the two front support rods 51 are rotatably pivotally connected to the lower ends of the front leg rods 1, respectively. In this example, a pivot seat 11 is pivotally mounted on the upper end of the front support rod 1, the upper ends of the two rear support rods 52 are rotatably pivotally connected to the pivot seat 11, and the lower ends of the two rear support rods 52 are rotatably pivotally connected to the lower ends of the rear support rods 2.

[0022] To make the front end of the chair frame more stable, a front support rod 6 can be provided in the chair frame. The upper end of the front support rod 6 is pivotally connected to the front end of the seat rod 4, and the lower end of the front support rod 6 can be slidably connected to the front leg rod 1. The lower end of the front support rod 51 can be pivotally connected to a sliding sleeve 61 that can slide on the front leg rod 1. The lower end of the front support rod 51 is located below the sliding sleeve 61 to avoid interference. A third limiting sleeve 62 can also be provided at the lower end of the front leg rod 1, located below the sliding sleeve 61 to stop the sliding sleeve 61. The rear end of the seat rod 6 is pivotally connected to the front leg rod 1 and the rear leg rod 2 in sequence. The front end of the seat rod 4 is pivotally connected to the support base 41 and can be supported in the support base 41 when the chair frame is unfolded.

[0023] In this embodiment, the chair frame may also include an armrest assembly, which includes an armrest rod 7 and an armrest support rod 63. The armrest support rod 63 can extend upward directly from the upper end of the front support rod 6. The upper end of the armrest support rod 63 is pivotally connected to and supported below the front end of the armrest rod 4. The upper end of the front support rod 4 passes through the support seat 41. The armrest support rod 63 can be located above the support seat 41 and bend upward, so that the armrest rod 7 is located above the seat rod 4 and is offset from the seat rod 4 to avoid interference when folded. The rear end of the armrest rod 7 can be pivotally connected to the front leg rod 1 or the rear leg rod 2 (refer to the first and second embodiments).

[0024] In this invention, the front leg 1 is tilted backward from bottom to top, and the rear leg 2 is tilted forward from bottom to top. The upper end of the rear leg 2 can be used to abut against the unfolded front leg 1 and form a pivot connection with the front leg 1. The pivot point between the two is located below the pivot seat 11. When the chair frame is unfolded, the front leg 1 and the rear leg 2 form a triangular support, and the rear leg 2 supports the front leg 1 forward. The upper end of the rear leg 2 forms a pivot connection with the front leg 1, which can create a linkage relationship when the chair frame is folded up, and they can be folded together. Then, the backrest 3 is pivotally connected to the pivot seat 11 located at the upper end of the front leg 1, so that the support of the backrest 3 can be more stable during use, and the chair frame can be unfolded and folded up smoothly and conveniently without increasing the length of the front leg 1 or the rear leg 2.

[0025] Specifically, the pivot seat 11 is provided with a connecting groove 111 for pivoting the backrest rod 3. The connecting groove 111 has a support surface (not shown in the figure) that allows the backrest rod 3 to tilt backward for support, so that the backrest rod 3 can be stably supported during use. The pivot seat 11 may also be provided with a connecting part 112, the upper end of the front leg rod 1 can be sleeved and pivotally connected to the connecting part 112, and the upper end of the rear support rod 52 in the rear cross support rod assembly can also be pivotally connected to the side of the connecting part 112.

[0026] Furthermore, the lower section of the backrest bar 3 can be bent to form a straightened section 31 with a smaller angle of inclination, allowing the upper section of the backrest bar 3 to better support the shoulders and neck, and the lower section to better fit the waist, thus being more ergonomic. The upper part of the front leg bar 1 at the connection with the rear leg bar 2 can also be bent forward to form an upper support section 12 with a smaller angle of inclination, according to design requirements, so that the connection of the backrest bar 2 is closer to the front.

[0027] Combination Figures 1 to 3 As shown, in this embodiment, the upper end of the rear leg 2 is connected to a support member 21, allowing the upper end of the rear leg 2 to be fitted and pivotally connected within the support member 21. The support member 21 also forms a support groove 211 with an opening facing the front leg 1. When the chair frame is unfolded, the front leg 1 can be tilted and supported in the support groove 211. The rear ends of the armrests 7 can be pivotally connected to the sides of the support member 21. In this embodiment, the rear ends of the armrests 7 are pivotally connected to the outer surface of the support member 21, intersecting with the seat post 4 located inside the front leg 1. The upper end of the rear leg 1 and the front leg 1 can be pivotally connected via a connecting strip 22. Each support member 21 also has a pair of symmetrical connecting strips 22 pivotally connected. One end of the connecting strip 22 is pivotally connected to the support member 21, and the other end is pivotally connected to the upper section of the front leg 1. The connecting strip 22 connected to the front leg 1 rotates upward with the front leg 1 when the chair frame is folded (in conjunction with...). Figure 2 , Figure 3 (As shown). The connecting strip 22 allows the front leg 1 and the rear leg 2 to maintain a linked relationship when folded.

[0028] CombinationFigures 1 to 3 As shown, when the folding chair frame needs to be folded, the front and rear cross support rods are brought together and retracted. The merging of the front and rear cross support rods causes the supports on both sides to retract inward. When the upper ends of the two front support rods 51 in the front cross support rod group move upward, the slider 61 at the bottom of the armrest support rod 6 slides upward on the front foot rod 1. The upward movement of the armrest support rod 6 causes the front end of the armrest rod 7 to lift (e.g., Figure 2 As shown), the front leg 1 retracts towards the rear leg 2 to achieve folding, ultimately completing the centralized folding of the entire folding chair frame (as shown). Figure 3 As shown in the figure, the chair frame is folded down to achieve the minimum volume. When in use, a chair cloth (not shown in the figure) is movably connected to the chair frame. The chair cloth may include a seat cloth and a backrest cloth. The seat cloth is connected between the two seat rods 4 to form the seat, and the backrest cloth is connected between the two backrest rods 3 to form the backrest. The seat cloth and the backrest cloth can be separate or connected as one piece. The chair cloth can be folded and unfolded along with the chair frame.

[0029] like Figure 4 The diagram shows the second embodiment of this utility model. The main difference between this embodiment and the first embodiment lies in the different pivotal connection between the upper end of the rear leg 2 and the front leg 1, as well as the change in the fit of the armrest 7 when folded. In this embodiment, a support member 21 is connected to the upper end of the rear leg 2. The support member 21 also has a support groove, but the front leg 1 can be directly pivotally connected to the support member 21. When the chair frame is unfolded, the front leg 1 is tilted and supported on the support groove of the support member 21. The rear ends of the armrest 7 are pivotally connected to the upper section of the front leg 1 and located above the support member 21. At the same time, an adjustment groove block 71 is connected to the bottom surface of each armrest 7. A sliding groove 711 is provided in the adjustment groove block 71 along the length direction of the armrest. The upper end of the armrest support rod 63 is pivotally connected to the sliding groove 711 and slides in it. The adjusting block 71 has grooves 712 on both sides. A pin (not shown in the figure) can pass through the groove and the upper end of the handrail support rod at the same time. The pin slides in the groove, causing the handrail support rod 63 and the front support rod 6 to slide back and forth in the slide groove 711.

[0030] In this embodiment, the rear end of the seat post 4 can be pivotally connected to the inner side of a connecting sleeve 81. The connecting sleeve 81 is connected to the rear leg post 2 and located below the support member 21. Above the connecting sleeve 81, there is also a first limiting sleeve 82 connected to the rear leg post 2. A second limiting sleeve 64 can also be connected to the front support rod 6 and located below the support seat 41. When the chair frame is folded, the two front support rods 51 of the front cross support rod group are combined and retracted, causing the sliding sleeve 61 at the lower end of the front support rod 6 to slide upward on the front leg post 1, causing the armrest rod 7 to fold upward. After sliding to a certain height, it slides backward in the sliding groove 711 with the help of the armrest support rod 63, so that the armrest rod 7, seat post 4, and armrest support rod 63 together with the front support rod 6 are retracted together.

[0031] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A folding chair frame, comprising symmetrical side supports and a front cross-bracing assembly and a rear cross-bracing assembly located on the front and rear facades, each side support comprising a front leg post, a rear leg post, a backrest post, and a seat post; the upper and lower ends of the front cross-bracing assembly are rotatably pivotally connected to the front end of the seat post and the lower end of the front leg post, respectively; the upper and lower ends of the rear cross-bracing assembly are rotatably pivotally connected to the upper end of the front leg post and the lower end of the rear leg post, respectively; the seat post is pivotally connected to the front leg post and the rear leg post in sequence; characterized in that: The front leg bar tilts backward from bottom to top, and the rear leg bar tilts forward from bottom to top. The upper end of the rear leg bar abuts against the unfolded front leg bar and forms a pivot connection with the front leg bar. A pivot seat is pivotally provided at the upper end of the front leg bar, and the backrest bar is pivotally connected to the pivot seat.

2. A folding chair frame according to claim 1, characterized in that: The pivot seat is provided with a connecting groove for pivoting the backrest rod, and the connecting groove forms a backing surface that allows the backrest rod to tilt backward for support.

3. A folding chair frame according to claim 1, characterized in that: The lower section of the backrest bar is bent to form a straight section with a smaller angle of elevation.

4. A folding chair frame according to claim 1 or 3, characterized in that: The front support bar bends forward at the upper part of the connection point with the rear support bar to form an upper support section with a smaller angle of elevation.

5. A folding chair frame according to claim 1, characterized in that: The chair frame is also equipped with a front support rod, the upper end of which is pivotally connected to the front end of the seat post, and the lower end of which can be slidably connected to the front foot post.

6. A folding chair frame according to claim 5, characterized in that: The chair frame is also equipped with an armrest assembly, which includes an armrest bar and an armrest support bar. The armrest support bar extends upward from the upper end of the front support bar. The upper end of the armrest support bar is pivotally connected to and supported below the front end of the armrest bar. The armrest bar is located above the seat bar and is offset from the seat bar. The rear end of the armrest bar is pivotally connected to the front or rear foot bar.

7. A folding chair frame according to claim 6, characterized in that: The lower end of the front support rod is pivotally connected to a sliding sleeve that can slide on the front foot rod. The front end of the seat rod is pivotally connected to a support seat. The upper end of the front support rod passes through the support seat. The upper end of the front cross support rod assembly is rotatably pivotally connected to the support seat. The front end of the seat rod is supported in the support seat when the chair frame is unfolded.

8. A folding chair frame according to claim 7, characterized in that: The upper end of the rear leg is connected to a support member with a support groove. When the chair frame is unfolded, the front leg is tilted and supported in the support groove. The rear ends of the armrests are pivotally connected to the sides of the support member. Each support member is also pivotally connected to a pair of symmetrical connecting strips. The upper end of the rear leg and the front leg are pivotally connected through the connecting strips. One end of the connecting strip is pivotally connected to the support member, and the other end of the connecting strip is pivotally connected to the front leg. The connecting strip connected to the front leg rotates upward with the front leg when the chair frame is folded.

9. A folding chair frame according to claim 7, characterized in that: A support member is connected to the upper end of the rear leg bar, and a support groove is formed on the support member. The front leg bar is pivotally connected to the support member and tilts and supports itself in the support groove when the chair frame is unfolded. The rear ends of the armrests are pivotally connected to the front leg bar and are located above the support member. An adjustment groove block is connected to the bottom surface of each armrest. A sliding groove is provided in the adjustment groove block along the length of the armrest. The upper end of the armrest support bar is pivotally connected to the sliding groove and slides.

10. A folding chair frame according to claim 9, characterized in that: The adjusting block has grooves on both sides, and a pin passes through both the grooves and the upper end of the armrest support rod. The rear end of the seat rod is pivotally connected to the inner side of a connecting sleeve. The connecting sleeve is connected to the rear foot rod and located below the support. Above the connecting sleeve, there is a first limiting sleeve connected to the rear foot rod. A second limiting sleeve is also connected to the front support rod and located below the support seat.

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