Backrest chair for students

Abstract

The utility model relates to a backrest chair for students, which comprises a chair body, and the chair body comprises a chair frame, a seat cushion and a backrest. A backrest fixing groove is arranged above the chair frame, and the chair is characterized in that the bottom of the backrest extends to form an inserting arm, a metal inserting strip is further arranged in the inserting arm, the inserting arm and the metal inserting strip are jointly inserted into the backrest fixing groove and are mutually fixed through a connecting piece, and the periphery of the root of the inserting arm and the periphery of the end of the backrest fixing groove are in smooth transition. The bottom of the backrest extends to form the inserting arm, and the metal inserting strip is embedded in the inserting arm and the backrest, so that the connecting strength of the inserting arm and the backrest is improved, and the connecting position is prevented from being broken off; in addition, the backrest fixing groove abuts against the limiting step for limiting, the peripheries of the backrest fixing groove and the limiting step are in smooth transition, a large gap is avoided, scratching is not likely to happen, and cleaning is convenient.

Description

Technical Field

[0001] The utility model relates to a piece of furniture, in particular to a chair with a backrest for students. Background Art

[0002] The current student chair includes a chair body, which includes a chair frame, a seat cushion and a backrest; the backrest is provided with a plug-in arm, and a backrest fixing groove is provided above the rear end of the chair frame. The plug-in arm is plugged into the backrest fixing groove and fixed by a connector. The plug-in arm and the backrest fixing groove are generally a large and a small tube structure, and the two are plugged together. The large and small tubes are plugged into each other to form a joint. The two tube sections are not straight, so they are easily scratched when passing by, and the joint is not convenient to clean. In addition, students are at the peak stage of growth and development, and their height increases rapidly, while the height of traditional seats cannot be adjusted, so they cannot adapt well to students.

[0003] Chinese Patent No. 2010202826672 discloses an easy-to-lift study chair, comprising a backrest 1 and a backrest fixing tube 2. Figure 1 and 2 As shown, the connection between them is through ordinary connecting parts, the connection strength is low, and there is a defect of a large and a small pipe structure.

[0004] Chinese Patent No. 2020233513536 discloses an adjustable chair, including a chair back 6, a slide 61, and an adjustment rod 5. Figure 4 As shown, the adjustment rod is inserted into the slide groove of the chair back through sliding fit, forming a more obvious seam, and the connection is more fragile and prone to breakage.

[0005] Chinese Patent No. 2021205879538 discloses an anti-hunchback backboard for middle school students, including a backrest board 1, a fixing seat 204 and a bent pipe column 203. Figure 2 As shown, the bent pipe column is simply matched with the fixing seat installed on the backrest plate, and the strength of the connection is low. Utility Model Content

[0006] The utility model aims to provide a student's backrest chair which has a reasonable structure, is easy to install, has reliable strength at the matching position between the chair back and the chair frame, has a smooth surface, and is easy to clean.

[0007] The purpose of the utility model is achieved in this way:

[0008] A student chair with a backrest comprises a seat body, which comprises a chair frame, a seat cushion and a backrest; a backrest fixing groove is arranged above the chair frame, a plug-in arm extends from the bottom of the backrest, a metal insert strip is arranged in the plug-in arm, the plug-in arm and the metal insert strip are inserted into the backrest fixing groove together and fixed to each other through a connecting piece, and the root periphery of the plug-in arm smoothly transitions to the end periphery of the backrest fixing groove.

[0009] The purpose of the utility model can also be solved by the following technical measures:

[0010] As a more specific solution, a limiting step is formed at the connection between the plug-in arm and the backrest, the notch of the backrest fixing groove abuts against the limiting step, and the outer periphery of the backrest fixing groove and the outer periphery of the limiting step transition smoothly, so that the surface of the matching place between the backrest and the chair frame is smooth, more beautiful and easy to clean.

[0011] As a further solution, the plug-in arm is provided with a plurality of circumferential ribs evenly distributed along the axial direction of the plug-in arm; the ribs are interference fit with the inner wall of the backrest fixing groove.

[0012] As a further solution, the upper end of the metal insertion strip extends into the backrest; the plug-in arm and the metal insertion strip are both provided with connecting holes corresponding to the connecting piece, and the connecting piece passes through the outer wall of the backrest fixing groove to be connected with the connecting hole; the metal insertion strip is oblate; the connecting hole of the metal insertion strip is a screw hole, the screw hole passes through the flat surface of the metal insertion strip, and the connecting piece passes through the screw hole and passes through the flat surface of the metal insertion strip.

[0013] As a further solution, the chair frame is formed by connecting a tube body, which includes two left and right backrest support tubes and two left and right L-shaped leg tubes; the upper end of the backrest support tube forms the backrest fixing groove; the left and right backrest support tubes are respectively coordinated with the left and right L-shaped leg tubes for lifting and lowering.

[0014] As a further solution, the lower end of the backrest support tube is plugged into the upper end of the L-shaped leg tube, the lower section of the backrest support tube is provided with a plurality of axially arranged adjustment holes, and the L-shaped leg tube is provided with fixing holes corresponding to the arrangement direction of the adjustment holes; the fixing hole cooperates with one of the adjustment holes through a plug-in connector or a screw connector.

[0015] As a further solution, a plastic sleeve is sleeved on the connection between the L-shaped leg tube and the backrest support tube, and the plastic sleeve is fixedly connected to the upper end of the L-shaped leg tube.

[0016] As a further solution, rear foot covers are provided at the bottom of the corners of the left and right L-shaped leg tubes; front foot covers are provided below the front ends of the left and right L-shaped leg tubes; the lateral sections of the left and right L-shaped leg tubes are connected and fixed by a lower cross tube to reinforce the entire chair frame structure and improve the stability of the seat.

[0017] As a further solution, the tube body also includes a U-shaped tube support, the two ends of the U-shaped tube support are respectively connected to the front sides of the left and right backrest support tubes, the inner side of the U-shaped tube support is connected to an upper cross tube, and the seat cushion is arranged on the U-shaped tube support.

[0018] As a further solution, a plurality of connecting pins and limit brackets are provided at the bottom of the seat cushion corresponding to the U-shaped support tube and the upper cross tube, the connecting pins are plugged into the upper sides of the U-shaped support tube and the upper cross tube, the lower sides of the U-shaped support tube and the upper cross tube are connected with bolts and the connecting pins, and a matching arc surface is provided at the bottom of the limit bracket corresponding to the upper sides of the U-shaped support tube and the upper cross tube, so as to improve the strength of the seat and enable the seat to withstand greater weight.

[0019] As a further solution, the seat cushion and the backrest are provided with ventilation holes; the backrest is provided with gripping holes.

[0020] The beneficial effects of the utility model are as follows:

[0021] (1) The backrest of this student chair has a plug-in arm extending from the bottom, and the plug-in arm and the backrest are inlaid with metal strips to increase the connection strength between the plug-in arm and the backrest to avoid breakage at the connection; in addition, the backrest fixing groove and the limit step are offset and limited, and the outer periphery of the two is smoothly transitioned to avoid the formation of a large seam, which is not easy to be scratched when passing by, and the seam is easy to clean.

[0022] (2) The L-shaped leg tube and the backrest support tube of this student chair can be raised and lowered in coordination with each other, so that the seat can be adjusted in height to better suit students of different ages and heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the decomposition structure of an implementation of the utility model.

[0024] Figure 2 It is the front view of the utility model.

[0025] Figure 3 for Figure 2 Schematic diagram of the AA cross-sectional structure.

[0026] Figure 4 for Figure 3 Enlarged structural diagram at B in the middle.

[0027] Figure 5 for Figure 3 Enlarged structural diagram at point C in the middle.

[0028] Figure 6 This is a schematic diagram of the structure of an implementation of the utility model.

[0029] Figure 7 for Figure 6 Schematic diagram of the structure from another angle.

[0030] Figure 8 This is a schematic diagram of the structure of the utility model used in conjunction with a desk.

[0031] Reference numerals:

[0032] 1-backrest, 11-plug-in arm, 111-limiting step, 112-convex rib, 113-connector, 12-metal insert, 13-ventilation hole, 14-grip hole, 2-chair frame, 21-backrest support tube, 211-backrest fixing slot, 212-adjustment hole, 22-plastic sleeve, 221-opening hole, 23-L-shaped foot tube, 231-lower horizontal tube, 232-rear foot cover, 233-front foot cover, 234-fixing hole, 235-screw, 24-U-shaped trusteeship, 25-upper horizontal tube, 26-hole, 3-seat cushion, 31-connecting pin, 32-limiting bracket, 33-bolt, 4-desk. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0034] See also Figure 1-Figure 7 As shown, the present application provides a student chair with a backrest, including a seat body, which includes a chair frame 2, a seat cushion 3 and a backrest 1; a backrest fixing groove 211 is provided above the chair frame 2, and a plug-in arm 11 extends from the bottom of the backrest 1, and a metal insert 12 is also provided in the plug-in arm 11. The plug-in arm 11 and the metal insert 12 are inserted into the backrest fixing groove 211 together and fixed to each other by a connecting piece 113 (screw), and the root periphery of the plug-in arm 11 smoothly transitions with the end periphery of the backrest fixing groove 211.

[0035] The student armchair provided in the present application has a limiting step 111 formed at the connection between the plug-in arm 11 and the backrest 1, the notch of the backrest fixing groove 211 abuts against the limiting step 111, and the outer periphery of the backrest fixing groove 211 smoothly transitions to the outer periphery of the limiting step 111, so that the surface of the matching place between the chair back and the chair frame is smooth, more beautiful and easy to clean.

[0036] The plug-in arm 11 is provided with a plurality of circumferential ribs 112 evenly distributed along the axial direction of the plug-in arm 11 ; the ribs 112 are interference fit with the inner wall of the backrest fixing groove 211 , so that the backrest 1 and the chair frame 2 can better fit closely.

[0037] The upper end of the metal insert 12 extends into the backrest 1 to reinforce the connection between the backrest 1 and the chair frame 2; the plug-in arm 11 and the metal insert 12 are both provided with connecting holes corresponding to the connecting piece 113, and the connecting piece 113 passes through the outer wall of the backrest fixing groove 211 to be connected with the connecting hole; the metal insert 12 is oblate; the connecting hole of the metal insert 12 is a screw hole, and the screw hole passes through the flat surface of the metal insert 12, and the connecting piece 113 passes through the screw hole and passes through the flat surface of the metal insert 12, so as to better fix the metal insert 12 in the plug-in arm 11.

[0038] The chair frame 2 is formed by connecting a tube body, which includes two left and right backrest support tubes 21 and two left and right L-shaped leg tubes 23; the upper end of the backrest support tube 21 forms the backrest fixing groove 211; the left and right backrest support tubes 21 are respectively coordinated with the left and right L-shaped leg tubes 23 for lifting and lowering, so that the height of the backrest 1 and the seat cushion 3 can be adjusted.

[0039] The lower end of the backrest support tube 21 is plugged into the upper end of the L-shaped leg tube 23, and the lower section of the backrest support tube 21 is provided with a plurality of axially arranged adjustment holes 212. The L-shaped leg tube 23 is provided with fixing holes 234 corresponding to the arrangement direction of the adjustment holes 212, and a screw connection (screw 235) is provided in the fixing hole 234; the fixing hole 234 cooperates with one of the adjustment holes 212 through the screw connection (screw 235), so that the backrest support tube 21 and the L-shaped leg tube 23 are fixed to each other, and the backrest 1 and the seat cushion 3 are adjusted to different heights by cooperating with different adjustment holes 212 to adapt to students of different ages and heights.

[0040] The connection between the L-shaped leg tube 23 and the backrest support tube 21 is sleeved with a plastic sleeve 22, which is provided with an opening 221. The plastic sleeve 22 is fixedly connected to the upper end of the L-shaped leg tube 23 by a screw connector (screw 235) to make the connection smooth and reinforce the connection.

[0041] A rear foot cover 232 is provided at the bottom of the corner of the left and right L-shaped foot tubes 23; a front foot cover 233 is provided below the front end of the left and right L-shaped foot tubes 23; the lateral sections of the left and right L-shaped foot tubes 23 are connected and fixed by a lower cross tube 231 to reinforce the structure of the chair frame 2 and form a stable base.

[0042] The tube body also includes a U-shaped support tube 24, the two ends of which are respectively connected to the front sides of the left and right backrest support tubes 21 to provide a fixed bracket for the seat cushion 3. The inner side of the U-shaped support tube 24 is connected to an upper cross tube 25, and the seat cushion 3 is arranged on the U-shaped support tube 24.

[0043] The seat cushion 3 is provided with a plurality of connecting pins 31 and a limiting bracket 32 ​​at the bottom corresponding to the U-shaped trustee 24 and the upper cross tube 25. The U-shaped trustee 24 and the upper cross tube 25 are provided with holes 26 corresponding to the connecting pins 31. The connecting pins 31 are plugged into the upper sides of the U-shaped trustee 24 and the upper cross tube 25. The lower sides of the U-shaped trustee 24 and the upper cross tube 25 are connected with bolts 33 connected with the connecting pins 31. The limiting bracket 32 ​​is provided with a matching arc surface at the bottom corresponding to the upper sides of the U-shaped trustee 24 and the upper cross tube 25 to improve the strength of the seat and enable the seat to withstand greater weight.

[0044] The seat cushion 3 and the backrest 1 are provided with ventilation holes 13 ; the backrest 1 is provided with a gripping hole 14 .

[0045] The installation principle is as follows: during installation, align the left and right plug-in arms 11 of the backrest 1 with the backrest fixing grooves 211 of the backrest support tube 21 and insert them until the notch of the backrest fixing groove 211 abuts against the limiting step 111. At this time, the connecting hole on the plug-in arm 11 corresponds to the screw hole of the backrest support tube 21, and the connecting piece 113 is inserted from the screw hole behind the outer wall of the backrest support tube 21 and screwed into the screw hole to stably fix the backrest 1 and the chair frame 2 together; at the same time, since the plug-in arm 11 is provided with a convex rib 112, the convex rib 112 and the inner wall of the backrest fixing groove 211 are interference fit to prevent looseness between the two; in addition, the lower end of the metal insert 12 and the plug-in arm 11 are inserted into the backrest fixing groove together 211, the upper end of the metal strip 12 extends out of the backrest fixing groove 211 and is integrally injection molded with the backrest 1. Because the metal strip 12 falls into the backrest 1 and the backrest support tube 21 at the same time, the strength of the chair is improved. Therefore, even in situations where students often play and easily knock over the chair, the connection between the backrest 1 and the chair frame 2 of the student chair is not easy to break; the lower end of the backrest support tube 21 is plugged into the upper end of the L-shaped leg tube 23, and the adjustment hole 212 and the fixing hole 234 at the same height of the lower sections of the left and right backrest support tubes 21 correspond to each other, and the screw 235 is screwed into the corresponding opening 221, the fixing hole 234 and the adjustment hole 212 to fix the upper half of the chair frame.

[0046] When the seat height needs to be adjusted, the screw 235 at the opening 221 on the plastic sleeve 22 can be unscrewed out of the adjustment hole 212. After the seat cushion 3 and the backrest 1 are adjusted to the required height, the other adjustment hole 212 corresponds to the fixing hole 234. At this time, the screw 235 is screwed into the corresponding adjustment hole 212 to fix the upper part of the chair frame.

[0047] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A student chair with a backrest, comprising a seat body, wherein the seat body comprises a chair frame (2), a seat cushion (3) and a backrest (1); a backrest fixing groove (211) is provided above the chair frame (2), and the characteristics are: A plug-in arm (11) extends from the bottom of the backrest (1), and a metal insert strip (12) is also provided in the plug-in arm (11). The plug-in arm (11) and the metal insert strip (12) are inserted into the backrest fixing groove (211) together and fixed to each other via a connecting piece (113), and the root periphery of the plug-in arm (11) and the end periphery of the backrest fixing groove (211) are smoothly transitioned.

2. The student chair with backrest according to claim 1, characterized in that: A limiting step (111) is formed at the connection between the plug-in arm (11) and the backrest (1), the notch of the backrest fixing groove (211) abuts against the limiting step (111), and the outer periphery of the backrest fixing groove (211) and the outer periphery of the limiting step (111) smoothly transition.

3. The student chair with backrest according to claim 1, characterized in that: The plug-in arm (11) is provided with a plurality of circumferential convex ribs (112) uniformly distributed along the axial direction of the plug-in arm (11); the convex ribs (112) are interference-fitted with the inner wall of the backrest fixing groove (211).

4. The student chair with backrest according to claim 1, characterized in that: The upper end of the metal insert strip (12) extends into the backrest (1); the metal insert strip (12) is oval in shape, and the connecting piece (113) passes through the flat surface of the metal insert strip (12).

5. The student chair with backrest according to claim 1, characterized in that: The chair frame (2) is formed by connecting a tube body, the tube body comprising two left and right backrest support tubes (21) and two left and right L-shaped leg tubes (23); the upper end of the backrest support tube (21) forms the backrest fixing groove (211); the left and right backrest support tubes (21) are respectively coordinated with the left and right L-shaped leg tubes (23) for lifting and lowering.

6. The student chair with backrest according to claim 5, characterized in that: The lower end of the backrest support tube (21) is plugged into and matched with the upper end of the L-shaped leg tube (23); the lower section of the backrest support tube (21) is provided with a plurality of axially arranged adjustment holes (212); the L-shaped leg tube (23) is provided with fixing holes (234) corresponding to the arrangement direction of the adjustment holes (212); the fixing hole (234) is mutually matched with one of the adjustment holes (212) via a plug-in connector or a screw connector.

7. The student chair with backrest according to claim 5, characterized in that: A plastic sleeve (22) is sleeved at the connection between the L-shaped leg tube (23) and the backrest support tube (21), and the plastic sleeve (22) is fixedly connected to the upper end of the L-shaped leg tube (23).

8. The student chair with backrest according to claim 5, characterized in that: The tube body further comprises a U-shaped tube support (24), the two ends of the U-shaped tube support (24) are respectively connected to the front sides of the left and right backrest support tubes (21), the inner side of the U-shaped tube support (24) is connected to an upper transverse tube (25), and the seat cushion (3) is arranged on the U-shaped tube support (24).

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