Height-adjustable desk

Abstract

The application relates to a height-adjustable desk, which comprises a desk top and a desk leg, the desk leg is installed with four legs on the lower surface of the desk top; the desk leg is mainly composed of an outer cylinder and an inner cylinder, the inner cylinder is gap-fitted and sleeved in the inner hole of the outer cylinder, the outer surface of the upper end of the outer cylinder is fixedly installed on the lower surface of the desk top through a connecting seat, and a height-adjusting device is arranged between the inner hole of the lower end of the outer cylinder and the outer surface of the inner cylinder; the outer surface of the desk leg is smooth, which avoids scratching the skin of children by protrusions, and the safety performance is good. The desk is suitable for small desks for children to write and draw.

Description

Technical Field

[0001] This invention relates to a school desk. It is suitable for use as a desk for school students or for children at home to write and draw. Background Technology

[0002] Currently, school desks, especially small tables used by children at home for practicing calligraphy and drawing, generally have four legs with a fixed height. This significantly impacts the comfort of use as children's height changes. Therefore, various height-adjustable desk products have become widely used. For example, the height-adjustable desk with patent number CN201820078131.5 includes a desk cabinet and desk legs. The desk legs consist of two parts: an upper part fixed to the lower surface of the desk cabinet and a lower part in contact with the ground. A screw rod is fixed to the lower end of the upper part of the desk leg, and an adjusting nut is provided at the upper end of the lower part of the desk leg. The screw rod is inserted through the nut and extends into the lower part of the desk leg. By adjusting the nut, the height can be adjusted. Adjusting the desk legs to the same height ensures the desk cabinet is level. This desk can accommodate students of different ages and can be adjusted according to the student's height. Its main drawback is that the adjusting nut protrudes radially from the outer surface of the desk leg, which can easily scratch or abrade a child's skin when used as a small table for preschool children to practice writing, drawing, or playing, posing a safety hazard. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a height-adjustable desk that is suitable for children's play and has good installation performance.

[0004] The technical solution of this invention includes a tabletop and table legs, with four table legs installed on the lower surface of the tabletop. The table legs are mainly composed of an outer cylinder and an inner cylinder. The inner cylinder is fitted into the inner hole of the outer cylinder with a clearance fit. The upper outer surface of the outer cylinder is fixedly installed on the lower surface of the tabletop via a connecting seat. A height adjustment device is provided between the lower inner hole of the outer cylinder and the outer surface of the inner cylinder. The height adjustment device includes a positioning buckle and a clamping spring. The positioning buckle is fitted into the outer surface of the inner cylinder with a clearance fit. The lower end of the positioning buckle has a radial shoulder, and the upper part of the positioning buckle has an elastic conical ring. A radial annular shoulder is provided on the outer surface of the positioning buckle below the elastic conical ring. The clamping spring is installed between the radial annular shoulder and the inner step at the lower end of the outer cylinder. An inner conical surface is formed on the inner wall of the outer cylinder above the radial annular shoulder, and several annular positioning grooves are axially and evenly arranged on the outer surface of the inner cylinder.

[0005] Ideally, the outer cylinder is made of plastic and the inner cylinder is made of hardwood. The inner step is formed by embedding a plastic buckle at the lower end of the outer cylinder. The outer ring surface of the plastic buckle is axially fixed to the inner wall of the outer cylinder, and the inner ring surface is dynamically fitted to the outer ring surface of the positioning buckle.

[0006] Ideally, a metal tube is installed between the inner wall of the inner conical surface of the outer cylinder and the outer surface of the inner cylinder, with the inner hole of the metal tube and the outer surface of the inner cylinder in a dynamic fit.

[0007] Ideally, a retaining ring should be installed between the outer surface of the upper part of the inner cylinder and the inner wall of the metal tube, and the retaining ring should be installed in the annular groove of the inner cylinder.

[0008] The advantages of this invention compared to the prior art are: the table legs are composed of an outer cylinder and an inner cylinder, and a height adjustment device is set between the outer cylinder and the inner cylinder to keep the outer surface of the table legs flat and smooth, avoiding protrusions from scratching or abrading children's skin, thus ensuring good safety performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention.

[0010] Figure 2 This is the present invention. Figure 1 Structural cross-sectional view of the middle table leg.

[0011] Figure 3 This is the present invention. Figure 1 A schematic diagram of the middle connector. Detailed Implementation

[0012] like Figure 1The height-adjustable desk shown includes a desktop 1 and four legs 4. The legs 4 are mounted on the lower surface of the desktop 1. The legs 4 are mainly composed of an outer cylinder 5 and an inner cylinder 6. The inner cylinder 6 is fitted into the inner hole of the outer cylinder 5 with a clearance fit. The outer surface of the upper end of the outer cylinder 5 is fixed to the lower surface of the desktop 1 through a connecting seat 3. A height adjustment device is provided between the inner hole of the lower end of the outer cylinder 5 and the outer surface of the inner cylinder 6. The height adjustment device includes a positioning buckle 8 and a compression spring 9. The positioning buckle 8 is fitted into the outer surface of the inner cylinder 6 with a clearance fit. The lower end of the positioning buckle 8 has a radial shoulder 11, which serves as a push handle. The upper part of the positioning buckle 8 is a variable-diameter elastic conical ring structure. When there is no external force, the diameter of the elastic conical ring expands freely. When the outer surface of the elastic conical ring is squeezed by an external force, the end ring surface contracts towards the center, and the diameter decreases. Therefore, an axial notch needs to be opened on the elastic conical ring. A radial annular shoulder 12 is provided on the outer circular surface of the positioning buckle 8 on the lower side of the elastic conical ring. A compression spring 9 is installed between the radial annular shoulder 12 and the inner step 10 at the lower end of the outer cylinder 5. An inner conical surface is formed on the inner wall of the outer cylinder 5 on the upper side of the radial annular shoulder 12. The inner conical surface cooperates with the elastic conical ring on the positioning buckle 8. Several annular positioning grooves 13 are axially and evenly arranged on the outer circular surface of the inner cylinder 6. When the desk is in normal use, the outer surface of the elastic conical ring at the top of the positioning buckle 8 is compressed by the compression spring 9 and the inner conical surface of the outer cylinder 5, compressing the end ring of the elastic conical ring towards the center, so that the end ring of the elastic conical ring is inserted into the annular positioning groove 13 of the inner cylinder 6, fixing the height of the desk leg 4; when adjusting the height, pull down the radial shoulder 11 to compress the compression spring 9, pulling the elastic conical ring at the top of the positioning buckle 8 out of the annular positioning groove 13 and away from the inner conical surface of the outer cylinder 5, so that its inner diameter naturally expands to be greater than the outer diameter of the inner cylinder 6, pulling the inner cylinder 6 out of the outer cylinder 5 to achieve height adjustment, such as Figure 2 As shown.

[0013] The outer cylinder 5 is made of plastic, the inner cylinder 6 is made of hardwood, and the inner step 10 is composed of a plastic buckle embedded in the lower end of the outer cylinder 5. The outer ring surface of the plastic buckle is axially fixed to the inner wall of the outer cylinder 5, and the inner ring surface is dynamically fitted to the outer ring surface of the positioning buckle 8.

[0014] A metal tube 7 is installed between the inner wall of the inner conical surface of the outer cylinder 5 and the outer surface of the inner cylinder 6 to increase the strength of the table legs. The inner hole of the metal tube 7 is dynamically fitted with the outer surface of the inner cylinder 6. The metal tube 7 is made of galvanized pipe.

[0015] A retaining ring 14 is provided between the upper outer circular surface of the inner cylinder 6 and the inner wall of the metal tube 7. The retaining ring 14 is installed in the annular groove of the inner cylinder 6 to increase the radial force between the inner cylinder 6 and the metal tube 7.

[0016] Connector 3 is made of plastic and is fixed to the underside of the tabletop 1 with screws. Its underside has connecting posts that connect with the table legs. Figure 3 As shown. The lower surface of the desktop 1 is provided with a table leg holder 2, and the table legs 4 can be removed and installed on the table leg holder 2. When used as a student desk, the table leg holder 2 can be replaced with a drawer for storing school bags.

Claims

1. A height-adjustable desk, comprising a desktop (1) and legs (4), wherein four legs (4) are mounted on the underside of the desktop (1); characterized in that... The table leg (4) is composed of an outer cylinder (5) and an inner cylinder (6). The inner cylinder (6) is fitted into the inner hole of the outer cylinder (5) with a clearance fit. The outer surface of the upper end of the outer cylinder (5) is fixedly installed on the lower plane of the tabletop (1) through a connecting seat (3). A height adjustment device is provided between the inner hole of the lower end of the outer cylinder (5) and the outer surface of the inner cylinder (6). The height adjustment device includes a positioning buckle (8) and a compression spring (9). The positioning buckle (8) is fitted into the outer surface of the inner cylinder (6) with a clearance fit. The lower end of the positioning buckle (8) is provided with a height adjustment device. It has a radial shoulder (11), and the upper part of the positioning buckle (8) is a variable diameter elastic conical ring structure. A radial annular shoulder (12) is provided on the outer circular surface of the positioning buckle (8) on the lower side of the elastic conical ring. A compression spring (9) is installed between the radial annular shoulder (12) and the inner step (10) at the lower end of the outer cylinder (5). An inner conical surface is formed on the inner wall of the outer cylinder (5) on the upper side of the radial annular shoulder (12), and several annular positioning grooves (13) are uniformly arranged axially on the outer circular surface of the inner cylinder (6).

2. The height-adjustable desk according to claim 1, characterized in that: The outer cylinder (5) is made of plastic material, the inner cylinder (6) is made of hardwood, and the inner step (10) is made of a plastic buckle embedded in the lower end of the outer cylinder (5). The outer ring surface of the plastic buckle is axially fixed to the inner wall of the outer cylinder (5), and the inner ring surface is dynamically fitted to the outer ring surface of the positioning buckle (8).

3. The height-adjustable desk according to claim 1 or 2, characterized in that: A metal tube (7) is provided between the inner wall of the inner conical surface of the outer cylinder (5) and the outer surface of the inner cylinder (6), and the inner hole of the metal tube (7) and the outer surface of the inner cylinder (6) are dynamically fitted.

4. The height-adjustable desk according to claim 3, characterized in that a retaining spring (14) is provided between the upper outer circular surface of the inner cylinder (6) and the inner wall of the metal tube (7), the retaining spring (14) being installed in the annular groove of the inner cylinder (6).

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