Classroom desk

Abstract

A classroom desk comprises a desk panel, a desk cavity, desk supporting legs and the like, a horizontal rolling groove c is fixed between the left desk supporting leg and the right desk supporting leg on the front side, the upper end of the horizontal rolling groove c abuts against the desk panel, and a horizontal rolling groove b is fixed between the left desk supporting leg and the right desk supporting leg on the near side. The upper end of the table cavity directly abuts against the table top plate or indirectly abuts against the table top plate through an inner hollow groove and a protruding column, the vertical plates at the two ends of the table cavity clamp the table supporting legs inside and are connected in a welded mode, stress transmission of the table body is safe and reliable, the machining process is simplified and smooth, and materials of the table cavity are saved by 8%-12%. The designed product is simple in appearance, and the rough image of a traditional steel-wood desk in primary and secondary schools is changed for tens of years.

Description

Technical Field

[0001] The present invention relates to supplies for primary and secondary school students, namely a classroom desk. Background Art

[0002] Chinese Patent 202421026769.6 (intensively formed classroom desks) includes a wooden or wood-like tabletop, a table belly rolled from carbon steel sheet, and steel table legs (pipes); upper flat bars are rolled on the upper sides of both ends of the table belly to facilitate connection to the tabletop, and the upper flat bars are fixed to the bottom side of the tabletop with screws; upright rolled tubes a at both ends of the proximal side of the table belly push against the tabletop and against the horizontal bottom plate of the table belly; the upper ends of the proximal table legs push against the horizontal bottom plate of the table belly and are welded and fixed; front side table legs are fixed to the left and right ends of the front side of the table belly, and the upper ends of the front side table legs push against the tabletop.

[0003] Compared to traditional steel desks, the 202421026769.6 product reshapes the conduction path of gravity between the belly and the tabletop, reducing the need for structural tubing. The joints between the belly and legs are concealed, requiring virtually no polishing. The outer surfaces of the left and right ends of the belly and the outer surfaces of the legs are flush with the surface, increasing belly space and maintaining a clean appearance. However, even with these improvements, primary and secondary school desks can still be optimized without compromising reliability. Summary of the Invention

[0004] The new task is to provide a classroom desk with reliable application strength and reduced table material.

[0005] This novel design scheme: A classroom desk includes a tabletop, a table belly made of rolled steel sheet, and table legs. The upper flat bars on the upper sides of the vertical surfaces at both ends of the table belly are fixed to the bottom side of the tabletop by screws. The upper ends of the front table legs abut against the tabletop and are connected to the table belly. A horizontal rolling groove C is fixed between the front left and right table legs to support the horizontal bottom plate of the table belly. A horizontal rolling groove B is fixed between the near left and right table legs to support the horizontal bottom plate of the table belly. It also includes one of the following three:

[0006] ① The upper end of the near side table legs is fixed against the horizontal bottom plate of the table belly, and the left and right end vertical surfaces of the table belly above the near side table legs are provided with inner hollow grooves or protruding columns;

[0007] ② There are preset cylindrical voids at both ends of the near side of the table belly, and the near side table legs pass through the cylindrical voids and press against the bottom side of the table top;

[0008] ③ The near side table legs pass through the horizontal bottom plate of the table belly and directly reach the table top. The inner sides of the left and right vertical plates of the table belly are fixed to the table legs.

[0009] In order to ensure the personal safety of the desk user, the near side edge of the desk belly board is flattened.

[0010] The upper end of the convex column is welded to the flat bar on the table belly, and the lower end is welded to the horizontal bottom plate of the table belly and fixed, and is actually connected to the upper end of the near side table leg.

[0011] In workshop production, when the table belly is still in a flat state after blanking, the left and right inner hollow groove structures of this design are obtained by directly pressing the mold at one time. The function of the inner hollow groove is similar to that of the convex column.

[0012] The preset cylindrical voids at both ends of the near side table belly are completely filled by the near side table legs passing through it. All the table legs are at the same height, and the gravity conduction between the table belly and the table top is safe and reliable.

[0013] When all the table legs pass through the horizontal bottom plate of the table belly and touch the top of the table top, and the inner sides of the left and right vertical plates of the table belly are welded and fixed to the table legs, the weight of the objects carried by the table belly and the weight of the human body crawling on the table top are reliably transmitted, and the desk is fully safe and reliable to use.

[0014] The weight of the objects carried by the table belly, the weight of the table top, and the weight of a person crawling on it are all transferred to the ground by means of the upper and lower joints between the protruding columns, the inner hollow grooves, and the table legs, or safely and directly transferred to the ground by means of the equal-height table legs. Compared to patent 202421026769.6, this design eliminates the original left and right proximal upright coils a, and the material used in the production of the table belly board is reduced by 8-12%. Including the process of flattening the edges of the table belly, the processing involved is simple and smooth. This design, with the upright panels on the end of the table belly facing outwards and clamping the legs of the desk, has changed the crude and rough appearance of traditional steel and wood desks in primary and secondary schools for decades. The product is extremely simple and represents a significant improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1a This is a visual diagram of the desk belly of this design with an inner hollow slot. Figure 1b yes Figure 1a The m-direction plane diagram, Figure 1c yes Figure 1b Schematic diagram of the flattened edge of the table bottom horizontal plate in the middle part A. Figure 1d Yes Figure 1a A horizontal cross-sectional diagram of Figure 1e It is a type of loaded column close to Figure 1d Schematic diagram of the partial structure of the table belly of this design.

[0016] Figure 2a -b are intuitive diagrams of convex columns from different perspectives, Figure 2c This is a schematic diagram of the spatial relative positions of the left and right convex columns and the left and right side table legs. Figure 2d -e are all pictures of the fixed state of the protruding columns on the inner side of the left and right ends of the table belly.

[0017] Figure 3a -c is a visual diagram of a desk belly that is different from each other but has cylindrical voids at both ends.

[0018] Figure 4a The table legs are of equal height. Figure 3a The schematic diagram of the desk frame of this design is shown on the table belly. Figure 4b is included Figure 3a and Figure 4a An intuitive diagram of the assembly.

[0019] Figure 5a This is a diagram of a table belly that is symmetrical on both sides with a horizontal bottom plate and a cutout. Figure 5b yes Figure 5a The n-direction plan view of the table belly, Figure 5c yes Figure 5a Schematic diagram of the flat surface of the table belly. Figure 5d is included Figure 5a -b shows the table and Figure 4a Assembly diagram of the desk frame.

[0020] Figure 6 yes Figure 5c The corresponding plan view of the table belly showing the relatively reduced material used in making the table belly compared to Chinese patent 202421026769.6. DETAILED DESCRIPTION

[0021] Example 1. The design of the desk is intended for primary and secondary school students. Figure 2e The product comprises a wooden or wood-like table top (11), table legs (12), and a table belly (2) made of rolled carbon steel sheet, wherein: the upper ends of the front table legs (121) abut against the bottom side of the table top (11), and the front sides of both ends of the table belly (2) are connected to the front table legs (121); the upper ends of the near side table legs (122) abut against the horizontal bottom plate (22) of the table belly and are welded together.

[0022] See also Figure 1a -b: The upper layers of both ends of the table belly (2) are rolled with upper flat strips (21), which are provided with a plurality of through holes (211); a plurality of blind holes preset on the bottom side of the table top plate (11) correspond to the positions of the through holes (211), and internal and external thread nuts are built into the blind holes of the table top plate (11). By means of screws passing through the through holes (211) and then being screwed onto the internal and external thread nuts, the upper flat strip (21) of the table belly is fixedly connected to the table top plate (11).

[0023] See also Figure 2c : A horizontal groove b (4) is arranged (welded) between the upper ends of the side table legs (122) (if the horizontal groove b (4) is not Figure 2c The independent piece shown in can also be obtained by continuous rolling the proximal extension area of the table belly horizontal bottom plate (22), see Figure 1bThe horizontal groove b (4) is fixed (welded) upward to the horizontal bottom plate (22) of the table belly. The gravity of the object carried by the table belly can be transmitted to the near side table legs (122) through the horizontal groove b (4) and then to the ground.

[0024] See also Figure 2c : There is a horizontal groove c (5) between the two front side table legs: the horizontal groove c (5) is upwardly fitted (welded) to the horizontal bottom plate (22) of the table belly (if the horizontal groove c (5) is not Figure 2c The horizontal groove c(5) can also be obtained by continuous rolling the extended area of the front side of the horizontal bottom plate of the table belly, see Figure 1b The weight of the load carried by the table belly can be transferred to the front table legs (121) through the horizontal groove c (5) and then to the ground.

[0025] See also Figure 2c -d: A middle rod (13) is welded between the front and near side legs (121 / 122) at the left and right ends of the desk, and the middle rod (13) assists in stabilizing the overall frame of the desk.

[0026] See also Figure 2a -b: The steel boss (3) is obtained by blanking and pressing the die; see Figure 2c Near the top of the side table legs and Figure 1e 、 Figure 2d : On the horizontal bottom plate (22) of the table belly just above the near side table legs (122), a convex column (3) is welded to the inner side of the end face vertical plate of the table belly (2), and the upper and lower end edges of the convex column (3) are welded to the upper flat strip (21) and the horizontal bottom plate (22) of the table belly. The convex column (3) forms a reinforcing rib relative to the left and right end vertical surfaces of the table belly, which is conducive to reliably transmitting the pressure on the table top to the near side table legs (122).

[0027] See also Figure 1d : In the same manner, corresponding to the position of the convex column (3), the end face vertical plate of the table belly (2) is partially pressed and stretched into a rectangular inner hollow groove (23). The upper end of the inner hollow groove (23) is flush with the upper flat bar (21), and the lower end is welded to the horizontal bottom plate (22) of the table belly. The inner hollow groove (23) obviously forms a load-bearing reinforcement rib relative to the left and right end vertical surfaces of the table belly (2), and its function is equivalent to the above-mentioned convex column (3).

[0028] Compared with the desk of Chinese Patent No. 202421026769.6, the gravity of the table top (11) and the table belly (2) of this design is transmitted more safely and reliably through the convex column (3) or the inner hollow groove (23).

[0029] The structural frame of the desk of this design includes four legs (12), two center rods (13), and may also include horizontal grooves b (4) and horizontal grooves c (5). Even with respect to various forces and unexpected situations during use by young students (such as possible horizontal lateral pushing forces), the cross-section and wall thickness of the pipe used for the desk do not need to be too large. However, the following factors related to the structural strength of the desk are worth emphasizing: ① The protruding column (3) fits the vertical surfaces at both ends of the table belly (2) and the horizontal bottom plate (22) and is welded together; the lower end of the inner hollow groove (23) is welded to the horizontal bottom plate (22) of the table belly; ② When the vertical plates at both ends of the table belly (2) are rolled into a state perpendicular (or approximately perpendicular) to the bottom surface, a 90° dihedral angle is formed; the front sides of the vertical plates at both ends of the table belly (2) are welded to the front table legs, and the horizontal bottom plate (22) of the table belly is welded to the upper end of the near side table legs; ③ A series of screws are passed through the through holes (211) of the upper flat bar and the corresponding internal and external thread nuts are screwed into the table top plate (11), that is, the strength of the thick table top plate (11) has been incorporated into the overall structural strength of the desk.

[0030] From the above, it can be seen that the belly (2) of the desk in this design is the builder of the desk's structural strength. The overall structural strength of the desk in this design has been proven to reach a practical level through experiments. In contrast, the belly of a traditional steel-wood desk mainly plays the role of a load exporter.

[0031] Figure 6 This is the planar expansion diagram of the 202421026769.6 desk belly (2) (the dotted line in the figure is the rolling position line of the desk belly), and the shadow box on the lower side is the area saved in this design. According to the front-to-back width of the desk belly (i.e. Figure 6 The difference in height between the upper and lower directions) of the table belly (2) of this design actually saves more than 8.6% (but usually no more than 12%) of the thin plate material. In addition, the structural pipe material of the desk has also been reduced compared with the same period last year.

[0032] The table belly made of carbon steel is thin, and the edges after cutting can be described as "sharp". Figure 1c yes Figure 1b The enlarged view of part A shows the meaning of the "flattening" (also known as "edging") process. In this design, the vertical edges at both ends of the belly (2) and the horizontal edges on the bottom surface are all required and suitable for overall "flattening". After flattening, the personal safety of the desk user is guaranteed.

[0033] Example 2. See Figure 3a -c: There are cylindrical voids (6) on the left and right sides of the horizontal bottom plate (22) of the desk belly. The cylindrical voids (6) are directly reserved when the desk belly (2) is laser cut (blank). Figure 3a -c visible: Figure 3a The upper flat strip (21) is cut off, and the top surface of the upper flat strip (21) is the top surface of the cylindrical void (6); Figure 3bThe upper flat strip (21) is not cut, and the bottom side of the upper flat strip (21) is the top surface of the columnar void (6); Figure 3c similar Figure 3b , in addition, at the preset position of the columnar void (6), the vertical surfaces of the left and right ends of the table belly are cut in the middle and rolled 90 degrees respectively to obtain the vertical rolling surface (24). When the near side table legs (122) are implanted into the columnar void (6), the vertical rolling surface (24) is welded to a pair of parallel surfaces of the near side table legs (122) in the upper and lower directions. The upper end of the near side table legs (122) is pressed against the lower side of the upper flat strip (21) (and welded). Then, the gravity on the desktop board (11) and the gravity of the load carried by the table belly (2) are transmitted to the ground with the help of the near side table legs (122). The desk is safe and reliable to use. Figure 4a -b. If the cylindrical void (6) is Figure 3a or Figure 3b Situations, applications similar to Figure 3c situation.

[0034] The rest is the same as Example 1.

[0035] Comparison between this example and Example 1. In Example 1, as the gravity transmitter between the upper end of the near side table leg and the table top, the convex column needs to be rolled separately and welded; the inner hollow groove needs to be obtained by mold pressing, and there are standard requirements for materials, structural strength, and configuration regularity. In this example, although the material consumption of the table belly is almost the same, the upper section of the near side table leg (122) extends along the columnar void (6) to directly abut against the table top (11) or indirectly abut against the table top (11) through the upper flat strip (21), which makes the transmission of the large gravity on the table top (11) and the gravity of the load carried by the table belly (2) safer and more reliable, and the processing is relatively simple, with a tendency to reduce costs.

[0036] Example 3. See Figure 5a : Preset openings (222) at appropriate positions on the left and right sides of the horizontal bottom plate (22) of the table belly, which are directly reserved when the table belly parts are laser cut (blanked). Let the near side table legs (122) pass through the openings (222) from bottom to top until they hit the top flat strip (21). Similarly: the front side table legs (121) are inserted into the front notch (221) and also hit the top flat strip (21). Each table leg (12) is of the same height and parallel to each other, and is attached to the inner side of the vertical surface at both ends of the table belly, and is perpendicular to the horizontal bottom plate (22) and the table top (11). Laser welding is used to connect each table leg (12) to the inner side of the vertical surface at both ends of the table belly, and to weld the connection between each table leg (12) and the horizontal bottom plate (22) of the table belly, and to weld the connection between each table leg (12) and the top flat strip (21). Obviously, the connection between the table belly (2) and the desk frame is fully reliable.

[0037] The rest is the same as Example 2.

[0038] This example is compared with Example 2. In Example 2, see Figure 4b, one side of each table leg (12) is embedded in the vertical plate at the end of the table belly, or in other words, the outer side of the table leg (12) at full height can be seen from the outside of the table belly end surface. In this example, the structural force is not inferior to that of Example 2, and the material consumption of the table belly (2) components is the same, but the laser cutting line is reduced, and the vertical rolling surface (24) in Example 2 is eliminated. Each table leg (12) is directly welded to the inner side of the table belly vertical panel, which simplifies the process and saves labor time; the front side table leg and the upper part of the near side leg are blocked by the table belly end panel and are no longer visible from the outside of the table belly end surface, making the appearance of the table body more concise. This example is a preferred embodiment.

[0039] It is also worth mentioning that: ① In each embodiment, the front notch (221) is provided for the front side table leg (121) to be connected. Compared with the previous two embodiments, the front notch (221) in Example 3 has changed, but it should not affect the understanding of its application. ② In each embodiment, the structure of the desk of this design is symmetrical on the left and right. ③ The material used for the table belly (2) component is a relatively thin carbon steel cold plate. While laser cutting the material, the marking lines of each position that needs to be welded are marked to facilitate accurate and qualified welding, so as to realize the simple assembly of the product without tooling. ④ Before the wooden panel of the desk of this design is assembled, the steel structure of the table belly and each table leg should have a suitable surface treatment (such as relatively environmentally friendly spraying).

Claims

1. A classroom desk, comprising a tabletop, a table belly made of rolled steel sheet, and table legs. The upper flat bars on the upper sides of the vertical surfaces at both ends of the table belly are fixed to the bottom side of the tabletop by screws. The upper ends of the front table legs abut against the tabletop and are connected to the table belly. A horizontal rolling groove c is fixed between the front left and right table legs to support the horizontal bottom plate of the table belly. A horizontal rolling groove b is fixed between the near left and right table legs to support the horizontal bottom plate of the table belly. Also includes one of the following three: ① The upper end of the near side table legs is fixed against the horizontal bottom plate of the table belly, and the left and right end vertical surfaces of the table belly above the near side table legs are provided with inner hollow grooves or protruding columns; ② There are preset cylindrical voids at both ends of the near side of the table belly, and the near side table legs pass through the cylindrical voids and press against the bottom side of the table top; ③ The near side table legs pass through the horizontal bottom plate of the table belly and directly reach the table top. The inner sides of the left and right vertical plates of the table belly are fixed to the table legs.

2. A classroom desk according to claim 1, characterized in that: Flatten the near side edge of the table top.

Images