Seat with adjustable depth

Abstract

The application discloses a seat depth adjustable seat, which comprises a chair back body and a chair seat body. The chair seat body comprises two outwardly protruding support parts on the left and right sides. The support parts are hollowed out to form sliding grooves extending along the front and back directions. The chair back body comprises two symmetrical movable parts on the left and right sides of the bottom. The movable parts are slidably connected to the support parts through the sliding grooves. The movable parts can be fixed at any front and back position on the support parts through a locking mechanism. When the chair back body is subjected to a leaning force, the stress of the chair back body is transmitted to the movable parts on the left and right sides, and the support parts on the left and right sides bear the load from the movable parts. The seat depth adjustable seat provided by the application supports the front and back sliding of the movable parts through the protruding support parts on the left and right sides of the chair seat body. The stress of the chair seat body is dispersed on the support parts on the left and right sides, thereby avoiding the stress concentration phenomenon, making the overall structure of the chair seat body more stable, preventing deformation, and making the seat more stable and longer in service life.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a seat with adjustable seat depth. Background Technology

[0002] Nowadays, children need to sit for long periods to study, so choosing a suitable chair is a major concern for many parents. A good study chair can not only relieve fatigue from prolonged sitting but also help children correct their posture and maintain good physical condition. Furthermore, to accommodate children's rapidly growing size, existing study chairs on the market also feature adjustable seat depth and a backrest that can slide forward and backward relative to the seat, ensuring that children of all sizes can sit comfortably.

[0003] The seat depth adjustment function of existing study chairs on the market is implemented as follows: the bottom of the backrest extends downward to form a pair of symmetrical movable parts. These movable parts bend and extend into the bottom of the seat. A pair of left and right support rods are provided at the bottom of the seat. The movable parts and the support rods are slidably connected. The backrest can be locked or unlocked at the current seat depth position by operating the adjustment switch on the movable part.

[0004] While the aforementioned study chair features easy-to-use seat depth adjustment, it suffers from the following problems: For ease of assembly, existing chair seats are typically designed as separate upper and lower sections. The lower shell is integrally molded using injection molding, and the two support rods are positioned near the center of the lower shell. When the user leans against the backrest, the pressure is transmitted through the movable part to the support rods, causing the stress on the lower shell to concentrate in the center. This makes the lower shell prone to deformation or even damage, resulting in a seat that is not only unstable but also has a short lifespan. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a seat with adjustable seat depth, in which the protruding support parts on both sides of the seat body support the sliding part back and forth, and the stress of the seat body is distributed on the left and right support parts, avoiding stress concentration, making the overall structure of the seat body more stable, less prone to deformation, and making the seat more stable and with a longer service life.

[0006] The effect of this utility model is achieved as follows: This application provides an adjustable seat depth seating, including a backrest body and a seat body. The seat body includes outwardly protruding support portions on both sides, with grooves extending in the front-back direction formed on the support portions. The backrest body includes two symmetrical movable portions at the bottom, which are slidably connected to the support portions via the grooves. The movable portions can be fixed to any front-back position on the support portions via a locking mechanism. When the backrest body is subjected to a leaning force, the stress of the backrest body is transmitted to the movable portions on both sides, and the support portions on both sides bear the load from the movable portions.

[0007] Furthermore, the movable part has a split structure, including a detachable outer part and an inner part. The outer part fits against the outer wall of the support part, and the inner part includes a sliding part and an abutting part. The abutting part abuts against the inner wall of the support part, and the sliding part passes through a groove and connects to the outer part. The height of the outer part and the abutting part is greater than the width of the groove, so that the support part is clamped between the outer part and the abutting part. This not only simplifies the assembly of the seat, but also increases the connection strength between the seat body and the backrest body by clamping the support part between the outer part and the abutting part.

[0008] Furthermore, the locking mechanism includes a knob screw that passes through the outer part and is screwed to the inner part. When the knob screw is turned clockwise or counterclockwise, the outer part and the abutment part clamp or loosen the support part, thereby locking or unlocking the movable part to the support part. This not only makes adjustment easy but also provides a high degree of freedom in adjustment.

[0009] Furthermore, several elastic portions are formed on the abutting part, and these elastic portions have elastic deformation capabilities. The abutting part abuts against the inner wall of the supporting part by means of the elastic force of the elastic portions. The restoring elastic force generated by the elastic portions not only makes the fit between the outer part, the inner part, and the supporting part tighter, but also effectively prevents the knob screw from being screwed in too deeply, thus extending its service life.

[0010] Furthermore, the elastic part is a spring-like structure formed by bending the abutment part. This allows the elastic part and the abutment part to be integrally formed, resulting in not only high strength but also simpler processing.

[0011] Furthermore, two positioning parts are formed on the outer side near the support, one above the other, which abut against the upper and lower ends of the support, respectively. This further enhances the connection strength between the outer side and the support, improving the stability of the seat depth adjustment operation and increasing the contact area between them. This strengthens the load-bearing capacity of the support and further improves the stability of the seating.

[0012] Furthermore, the width of the lower positioning part is longer than that of the upper positioning part. This allows the load borne by the lower part of the support to be distributed more evenly, thereby further improving the stability of the seating.

[0013] Furthermore, the movable parts on the left and right sides are connected by a connecting rod. The left and right sides of the connecting rod are detachably connected to the movable parts on both sides, and the connecting rod is configured to drive the movable parts on both sides to move synchronously. This makes the seat depth adjustment operation very stable and smooth.

[0014] Furthermore, a mounting portion is formed on the side of the movable part near the connecting rod. A groove is recessed in the mounting portion, and an opening is provided on the upper side of the groove. The connecting rod is engaged with the mounting portion through the groove. This makes the installation and positioning operation of the connecting rod relatively simple.

[0015] The adjustable seat depth provided in this application features a movable part that slides slidably to a support part via a groove. This allows the backrest body to slide back and forth relative to the seat body to adjust the seat depth. Furthermore, a locking mechanism allows the movable part to be fixed at any back or forth position, meaning the backrest body can also be fixed at any seat depth. This provides the seat with a high degree of freedom in seat depth adjustment, enhancing its practicality. Additionally, the protruding support parts on both sides of the seat body support the sliding of the movable part. Compared to existing seats, the stress on the seat body is not concentrated in the center but distributed on the left and right support parts, avoiding stress concentration. This results in a more stable overall seat structure, reducing the likelihood of deformation and improving the seat's stability and lifespan. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural diagram of the seating provided in the embodiments of this application; Figure 2 This is a schematic diagram illustrating the changes in the seat depth during an embodiment of this application. Figure 3 A schematic diagram of the connection structure between the active part and the support part provided in an embodiment of this application; Figure 4 This is a schematic diagram of the internal structure of the chair seat body provided in an embodiment of this application; Figure 5 A schematic diagram of the connection structure between the inner side and the seat body provided in an embodiment of this application; Figure 6 A schematic diagram of the connection structure between the outer and inner portions provided in an embodiment of this application; Figure 7 A cross-sectional structural diagram of the seating provided in an embodiment of this application; Figure 8 A three-dimensional structural diagram of the inner side when an elastic portion is provided on the abutment portion according to an embodiment of this application; Figure 9 This is a schematic diagram of the internal structure of the chair body when an elastic part is provided on the abutment portion, as provided in the embodiment of this application.

[0017] The reference numerals in the attached figures are as follows: 1-backrest body, 110-outer side, 111-positioning part, 120-inner side, 121-sliding part, 122-abutting part, 123-elastic part, 124-installation part, 125-slot, 2-seat body, 2a-seat cushion, 2b-chassis, 201-accommodating cavity, 210-support part, 211-slide groove, 3-knob screw, 4-connecting rod. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0019] Please refer to the attached document. Figure 1-9 This application provides an adjustable seat depth seating, including a backrest body 1 and a seat body 2. The seat body 2 includes support portions 210 protruding outward on both sides. The support portions 210 have a slotted groove 211 extending in the front-back direction. The backrest body 1 includes two symmetrical movable portions at the bottom. The movable portions are slidably connected to the support portions 210 through the slots 211, and the movable portions can be fixed to any front-back position on the support portions 210 by a locking mechanism. When the backrest body 1 is subjected to a leaning force, the stress of the backrest body 1 is transmitted to the movable portions on both sides, and the support portions 210 on both sides bear the load from the movable portions.

[0020] In this embodiment, the movable part is slidably connected to the support part 210 via the slide groove 211, allowing the backrest body 1 to slide back and forth relative to the seat body 2 to adjust the seat depth. Furthermore, with the aid of a locking mechanism, the movable part can be fixed at any back or forth position, meaning the backrest body 1 can also be fixed at any seat depth position. This provides the seat with a high degree of freedom in seat depth adjustment, enhancing its practicality. Moreover, the protruding support parts 210 on both sides of the seat body 2 support the movable part's back and forth sliding. Compared to existing seats, the stress on the seat body 2 is not concentrated in the center but distributed on the left and right support parts 210, avoiding stress concentration. This makes the overall structure of the seat body 2 more stable, less prone to deformation, resulting in better seat stability and a longer service life.

[0021] Please refer to the attached document. Figure 3 Appendix Figure 6 and attached Figure 7 In some embodiments of this application, the movable part is a split structure, including an outer part 110 and an inner part 120 that can be detached from each other. The outer part 110 is attached to the outer wall of the support part 210. The inner part 120 includes a sliding part 121 and an abutting part 122. The abutting part 122 abuts against the inner wall of the support part 210, and the sliding part 121 passes through the slide groove 211 and is connected to the outer part 110. The height of the outer part 110 and the abutting part 122 is greater than the width of the slide groove 211, so that the support part 210 is clamped between the outer part 110 and the abutting part 122.

[0022] In this embodiment, the chair seat body 2 is a split structure, including an upper seat cushion 2a for supporting the user and a lower chassis 2b for connecting to the chassis. The chassis 2b is a basin-shaped structure with a downward-sloping center, and its recessed portion forms a receiving cavity 201. Support portions 210 are formed on the left and right sides of the chassis 2b. By setting the movable part as a split structure, when assembling the seat, the inner part 120 is first placed into the receiving cavity 201, and the sliding part 121 passes through the sliding groove 211 from the inside of the support portion 210, with the abutting part 122 abutting against the inner wall of the support portion 210. Then, the chair back body 1 is installed, with the two outer parts 110 at the bottom of the chair back body 1 fitting against the outer side of the support portion 210. The outer parts 110 and the sliding part 121 are fitted together and fixed, thus installing the chair back body 1 onto the chassis 2b. Finally, the seat cushion 2a is installed on the chassis 2a, thus completing the assembly of the seat. This not only makes the assembly of the seat easier, but also makes the connection between the seat body 2 and the backrest body 1 stronger because the support part 210 is clamped between the outer part 110 and the abutment part 122.

[0023] Please refer to the attached document. Figure 3 and attached Figure 7 In some embodiments of this application, the locking mechanism includes a knob screw 3, which passes through the outer side 110 and is screwed to the inner side 120. When the knob screw 3 is turned in the forward or reverse direction, the outer side 110 and the abutment 112 clamp or loosen the support 210, so that the movable part is locked or unlocked to the support 210.

[0024] In this embodiment, turning the knob screw 3 can cause the outer part 110 and the abutment part 112 to clamp or loosen the support part 210, thereby realizing the seat depth locking or unlocking operation of the seat. Not only is the adjustment operation simple, but the above-mentioned condition mode is stepless adjustment, and the backrest body 1 can be fixed at any seat depth, with a high degree of adjustment freedom.

[0025] In this application, the abutment portion 112 can connect to the support portion 210 in other ways besides directly pressing against the inner wall of the support portion 210: Please refer to the attached document. Figure 8-9 In some embodiments of this application, a plurality of elastic portions 123 are formed on the abutting portion 122. The elastic portions 123 have elastic deformation capability, and the abutting portion 122 abuts against the inner sidewall of the support portion 210 by means of the elastic force of the elastic portions 123.

[0026] In this embodiment, the support part 210 and the movable part are fixed by threaded fastening. Although the operation is simple, if the knob screw 3 is screwed in too deeply, it may cause deformation or even breakage of the threaded part, affecting the stability of the seat. Therefore, by forming an elastic part 123 on the abutment part 122, when the outer part 110 and the abutment part 112 are clamped together by the knob screw 3, the elastic part 123 on the abutment part 122 abuts against the inner wall of the support part 210 and slowly produces elastic deformation. The restoring force generated by the elastic part 123 not only makes the fit between the outer part 110, the inner part 120 and the support part 210 tighter and improves the connection strength between the movable part and the support part 210, but also effectively prevents the knob screw 3 from being screwed in too deeply, protects the movable part, and extends its service life.

[0027] Please refer to the attached document. Figure 8-9 In some embodiments of this application, the elastic portion 123 is a spring-shaped structure formed by bending the abutment portion 122. This makes the elastic portion 123 and the abutment portion 122 integrally formed, which not only has high strength but also simplifies the processing operation.

[0028] Of course, in other embodiments of this application, the elastic part 123 may also be a rubber pad, spring or other structure with elastic deformation capability.

[0029] In some embodiments of this application, the outer side 110 has two positioning portions 111 formed on the side near the support portion 210, and the two positioning portions 111 respectively abut against the upper and lower ends of the support portion 210.

[0030] In this embodiment, the outer part 110 clamps the support part 210 through two upper and lower positioning parts 111, so that the outer part 110 and the support part 210 are relatively fixed in the vertical direction, which further improves the connection strength between the two. This not only makes the seat depth adjustment operation more stable, but also increases the contact area between the outer part 110 and the support part 210, so that the load borne by the support part 210 can be better distributed to the outer surface of the support part 210, thereby making the support part 210 more load-bearing and further improving the stability of the seat.

[0031] Please refer to the attached document. Figure 6-7 In some embodiments of this application, the width of the lower positioning portion 111 is longer than that of the upper positioning portion 111.

[0032] In this embodiment, when the outer portion 110 applies a load to the support portion 210, the lower positioning portion 111 applies a larger load to the support portion 210. Therefore, the lower positioning portion 111 is longer, so that the load borne by the lower side of the support portion 210 can be distributed more evenly, thereby further improving the stability of the seat.

[0033] Please refer to the attached document. Figure 4-5 In some embodiments of this application, the movable parts on the left and right sides are connected by a connecting rod 4. The left and right sides of the connecting rod 4 are detachably connected to the movable parts on both sides, and the connecting rod 4 is configured to drive the movable parts on both sides to move synchronously.

[0034] In this embodiment, some existing adjustable seat depth chairs have independent sliding sides on the bottom of the backrest relative to the seat. This can cause the backrest to shift during adjustment, resulting in a noticeable lag and instability in the seat depth adjustment operation. Therefore, by connecting the movable parts on both sides with the connecting rod 4, when the user pushes or pulls the backrest body 1, the movable parts on both sides slide synchronously and always remain on the same horizontal line, making the seat depth adjustment operation very stable and smooth.

[0035] Please refer to the attached document. Figure 5 In some embodiments of this application, a mounting portion 124 is formed on the side of the movable part near the connecting rod 4. A groove 125 is recessed on the mounting portion 124. The upper side of the groove 125 is open, and the connecting rod 4 is engaged with the mounting portion 124 through the groove 125.

[0036] In this embodiment, by forming a slot 125 with an upper opening on the mounting part 124, when assembling the seat, the connecting rod 4 can be aligned with both ends of the slot 125 on the mounting part 124 and then inserted from top to bottom, so that the connecting rod 4 and the movable part are relatively fixed horizontally, achieving initial positioning. This makes the installation and positioning operation of the connecting rod 4 relatively simple.

[0037] Preferably, the inner side 120 near the connecting rod 4 forms a mounting portion 124. After the connecting rod 4 and the mounting portion 124 are snapped together, they are fixed together by screws, which is simple to install and remove and has a high connection strength.

[0038] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0039] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A seat with adjustable seat depth, characterized in that, The chair includes a backrest body (1) and a seat body (2). The seat body (2) includes support portions (210) that protrude outward on the left and right sides. The support portions (210) have a slot (211) that extends in the front-back direction. The backrest body (1) includes two movable portions that are symmetrically arranged on the bottom. The movable portions are slidably connected to the support portions (210) through the slot (211). The movable portions can be fixed to any front-back position on the support portions (210) by a locking mechanism. When the backrest body (1) is subjected to a leaning force, the stress of the backrest body (1) is transmitted to the movable portions on both sides, and the support portions (210) on both sides bear the load from the movable portions.

2. The adjustable seat depth seating according to claim 1, characterized in that, The movable part is a split structure, including an outer part (110) and an inner part (120) that can be detached from each other. The outer part (110) is attached to the outer wall of the support part (210). The inner part (120) includes a sliding part (121) and an abutting part (122). The abutting part (122) abuts against the inner wall of the support part (210), and the sliding part (121) passes through the slide groove (211) and is connected to the outer part (110). The height of the outer part (110) and the abutting part (122) is greater than the width of the slide groove (211), so that the support part (210) is clamped between the outer part (110) and the abutting part (122).

3. The adjustable seat depth seating according to claim 2, characterized in that, The locking mechanism includes a knob screw (3) that passes through the outer side (110) and is screwed to the inner side (120). When the knob screw (3) is turned in the forward or reverse direction, the outer side (110) and the abutment (122) clamp or release the support (210), so that the movable part is locked or unlocked to the support (210).

4. The adjustable seat depth seating according to claim 2, characterized in that, The abutting part (122) has a plurality of elastic parts (123) formed thereon, the elastic parts (123) having elastic deformation capability, and the abutting part (122) abuts against the inner wall of the support part (210) by means of the elastic force of the elastic parts (123).

5. The adjustable seat depth seating according to claim 4, characterized in that, The elastic part (123) is a spring-shaped structure formed by bending the abutting part (122).

6. The adjustable seat depth seating according to claim 2, characterized in that, The outer side (110) has two positioning parts (111) on the side near the support part (210), and the two positioning parts (111) abut against the upper and lower ends of the support part (210) respectively.

7. The adjustable seat depth seating according to claim 6, characterized in that, The width of the positioning part (111) located on the lower side is longer than that of the positioning part (111) located on the upper side.

8. The adjustable seat depth seating according to claim 1, characterized in that, The movable parts on the left and right sides are connected by a connecting rod (4). The left and right sides of the connecting rod (4) are detachably connected to the movable parts on both sides. The connecting rod (4) is configured to drive the movable parts on both sides to move synchronously.

9. The adjustable seat depth seating according to claim 8, characterized in that, A mounting portion (124) is formed on the side of the movable part near the connecting rod (4). A groove (125) is recessed on the mounting portion (124). The groove (125) has an opening on its upper side. The connecting rod (4) is engaged with the mounting portion (124) through the groove (125).

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