Two-stage hand-operated device and lunch desk

Abstract

The utility model provides a two -stage hand -operated device and noon break desk and chair. Two -stage hand -operated device includes handle, rocker and two -stage rod, and handle and two -stage rod are arranged at the both ends of rocker respectively, and are located at the opposite sides of rocker respectively, two -stage rod includes first -stage rod, second -stage rod and reinforcing rod, and one end of first -stage rod sets up in one end of second -stage rod, and the outer periphery of second -stage rod protrudes in the outer periphery of first -stage rod, and the other end of second -stage rod is installed in rocker, and is fixedly connected with reinforcing rod, and reinforcing rod sets up in rocker, and extends towards handle. Adopt coaxial setting first -stage rod and second -stage rod, make two -stage hand -operated device can be adapted two different specifications drive hole simultaneously, and the convenient use and storage, reinforcing rod can improve the connecting strength between two -stage rod and rocker, and rocker can exert force to two -stage rod through reinforcing rod, make second -stage rod can bear greater moment, and two -stage rod is not easy to fall off from rocker, effectively improve structural strength.

Description

Technical Field

[0001] This utility model relates to the field of school desks and chairs, and in particular to a two-stage hand-cranked device and a desk and chair for lunch break. Background Technology

[0002] The desks and chairs for lunch break are height-adjustable to accommodate students of different heights. The simplest and most convenient mechanism is the hand-cranked height adjustment. The handcrank typically has only one size of hexagonal lever with a 6mm distance between opposite sides, suitable for adjusting the height of the desks and chairs. To accommodate different reclining angles, the chair backrests are also angle-adjustable. The hexagonal holes on the reclining angle adjustment screws have a 4mm distance between opposite sides, requiring a 4mm hexagonal key for student adjustment. This adds to the inconvenience of having multiple tools and making storage difficult. The hexagonal levers are usually pressed into the hexagonal holes on the plastic handcrank. However, the limited clamping force of the plastic means that the levers with smaller distances between opposite sides cannot withstand large torques, posing a risk of them falling off and resulting in poor structural strength. Utility Model Content

[0003] This utility model provides a two-stage hand-cranked device and a lunch break desk and chair, which are convenient to use and store, and can improve structural strength.

[0004] On the one hand, this utility model provides a two-stage hand crank device, including a handle, a rocker arm and two stages of rods, wherein the handle and the two stages of rods are respectively disposed at both ends of the rocker arm and are located on opposite sides of the rocker arm;

[0005] The two-stage lever includes a first-stage lever, a second-stage lever, and a reinforcing lever. Both the first-stage lever and the second-stage lever are polygonal levers and are coaxially arranged. One end of the first-stage lever is located at one end of the second-stage lever, and the outer periphery of the second-stage lever protrudes beyond the outer periphery of the first-stage lever. The other end of the second-stage lever is installed on the rocker arm and is fixedly connected to the reinforcing lever. The reinforcing lever is located inside the rocker arm and extends toward the handle.

[0006] The reinforcing rod and the second-stage rod are formed by bending the same metal rod.

[0007] The first-stage rod and the second-stage rod are integrally formed from metal.

[0008] Both the first-stage rod and the second-stage rod are hexagonal rods, and the axial length of the first-stage rod is less than or equal to the distance between opposite sides of the first-stage rod.

[0009] The rocker arm includes a main body and a cover plate; the main body is provided with a mounting hole and a limiting groove, the mounting hole is matched with the shape of the second-stage rod and is interference-fitted; the limiting groove is provided on the side of the main body adjacent to the handle, and the reinforcing rod is installed in the limiting groove; the cover plate is provided on the side of the main body adjacent to the handle, and the cover plate covers the mounting hole and the limiting groove.

[0010] The main body has a mounting cavity on the side adjacent to the handle, the mounting cavity having a mounting opening facing the cover plate, and the cover plate covering the mounting opening; the mounting hole communicates with the mounting cavity; one end of the limiting groove adjacent to the mounting hole communicates with the mounting cavity, and the side of the limiting groove facing the cover plate is open; the reinforcing rod includes a first sub-rod and a second sub-rod, the first sub-rod being connected between the second stage rod and the second sub-rod, the first sub-rod being located in the mounting cavity, and the second sub-rod being limited in the limiting groove.

[0011] The cover plate has a first pressing part and a second pressing part on the side facing the main body. The first pressing part abuts against the first sub-rod and the two are arranged in parallel, and is used to press the first sub-rod into the mounting cavity. The second pressing part abuts against the second sub-rod and the two are arranged crosswise, and is used to press the second sub-rod into the limiting groove.

[0012] The handle is rotatably mounted on the main body, and one end of the cover plate extends between the handle and the main body.

[0013] The main body has an installation tube on the side adjacent to the handle. The inner cavity of the installation tube is divided into a first inner cavity and a second inner cavity along its axial direction. The first inner cavity is connected to the side of the main body opposite to the handle, and the second inner cavity is connected to the handle. The diameter of the first inner cavity is larger than the diameter of the second inner cavity.

[0014] The two-stage hand-cranked device further includes a rotating shaft, which comprises a first shaft and a second shaft coaxially arranged. The first shaft is rotatably disposed in the first inner cavity, and its diameter is larger than the diameter of the second inner cavity; the second shaft is rotatably disposed in the second inner cavity.

[0015] The handle includes an outer cylinder and an inner cylinder spaced apart inside the outer cylinder. The outer cylinder and the inner cylinder are connected to each other at their ends away from the main body. The outer cylinder is rotatably sleeved outside the mounting tube, and the inner cylinder is rotatably disposed inside the mounting tube. The second shaft is installed inside the inner cylinder, and the two are interference-fitted.

[0016] On the other hand, this utility model provides a lunch break desk and chair, including the aforementioned two-stage hand-cranked device.

[0017] The two-stage hand-crank device and lunch break desk and chair provided by this utility model adopt a coaxial first-stage rod and a second-stage rod, which allows the two-stage hand-crank device to be adapted to two different sizes of drive holes at the same time, making it convenient to use and store. The lunch break desk and chair do not need to be equipped with too many hand-crank devices. The reinforcing rod can improve the connection strength between the two-stage rod and the rocker arm. The reinforcing rod extends towards the handle, and the rocker arm can apply force to the two-stage rod through the reinforcing rod, so that the second-stage rod can withstand greater torque. This allows the first-stage rod and the second-stage rod to be set on the same rod, and the two-stage rod is not easy to fall off the rocker arm, effectively improving the structural strength. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of the two-stage hand-cranked device provided in a preferred embodiment of this utility model;

[0019] Figure 2 yes Figure 1 A structural schematic diagram of the two-stage hand-cranked device from another angle;

[0020] Figure 3 yes Figure 1 A schematic diagram of the structure of the two-stage hand-cranked device with the cover plate open;

[0021] Figure 4 yes Figure 1 Exploded view of the two-stage hand-cranked device;

[0022] Figure 5 yes Figure 1 Cross-sectional view of the two-stage hand-cranked device;

[0023] Figure 6 yes Figure 3 A schematic diagram of the cover plate of the two-stage hand-cranked device. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] In the diagram, units with similar structures are represented by the same labels.

[0026] This utility model provides a lunch break desk and chair set, including a desk, a chair, and a two-stage hand crank. Both the desk and chair are provided with a first drive hole for adjusting the height, and the chair is also provided with a second drive hole for adjusting the reclining angle of the backrest. The two-stage hand crank can be inserted into the first and second drive holes to drive the corresponding adjustment mechanisms, thereby adjusting the desk and chair.

[0027] Please see Figure 1 and Figure 2 The two-stage hand crank device includes a handle 1, a rocker arm 2, and two-stage rods 3. The handle 1 and the two-stage rods 3 are respectively located at both ends of the rocker arm 2 and at opposite sides of the rocker arm 2. The two-stage rods 3 are used to insert into the first drive hole and the second drive hole. The user can hold the handle 1 to drive the two-stage rods 3 to rotate around their own axis, thereby driving the adjustment mechanism of the desk and chair.

[0028] like Figure 2 , Figure 3 As shown, the two-stage rod 3 includes a first-stage rod 31, a second-stage rod 32, and a reinforcing rod 33. Both the first-stage rod 31 and the second-stage rod 32 are polygonal rods and are coaxially arranged. One end of the first-stage rod 31 is located at one end of the second-stage rod 32, and the outer periphery of the second-stage rod 32 protrudes beyond the outer periphery of the first-stage rod 31, that is, the outer periphery of the second-stage rod 32 is larger than the outer periphery of the first-stage rod 31. A step can be formed at the connection between the second-stage rod 32 and the first-stage rod 31.

[0029] In this embodiment, both the first-stage rod 31 and the second-stage rod 32 are hexagonal rods, and the corresponding first driving hole and second driving hole are also hexagonal holes. The distance between opposite sides of the first-stage rod 31 is 4mm, and the distance between opposite sides of the second-stage rod 32 is 6mm.

[0030] One of the first-stage rod 31 and the second-stage rod 32 corresponds to and mates with the first driving hole, and the other corresponds to and mates with the second driving hole. In this embodiment, the first-stage rod 31 mates with the second driving hole, meaning the distance between opposite sides of the second driving hole is 4mm, and the second-stage rod 32 mates with the first driving hole, meaning the distance between opposite sides of the first driving hole is 6mm.

[0031] The first-stage rod 31 and the second-stage rod 32 are coaxially arranged, which allows the two-stage hand crank to be adapted to two different sizes of drive holes at the same time, making it convenient to use and store. The desks and chairs for lunch break do not need to be equipped with too many hand cranks.

[0032] The axial length of the first-stage rod 31 is less than or equal to the distance between opposite sides of the first-stage rod 31, making the first-stage rod 31 a short and thick structure, which gives it strong structural strength and makes it less prone to breakage.

[0033] The other end of the second-stage rod 32 is mounted on the rocker arm 2 and fixedly connected to the reinforcing rod 33. The reinforcing rod 33 is located inside the rocker arm 2 and extends towards the handle 1. The reinforcing rod 33 improves the connection strength between the two-stage rods 3 and the rocker arm 2. Because the reinforcing rod 33 extends towards the handle 1, the rocker arm 2 can apply force to the two-stage rods 3 through the reinforcing rod 33, enabling the second-stage rod 32 to withstand greater torque. This allows the first-stage rod 31 and the second-stage rod 32 to be mounted on the same rod, and the two-stage rods 3 are less likely to detach from the rocker arm 2, effectively improving structural strength.

[0034] The reinforcing rod 33 and the second-stage rod 32 are formed by bending the same metal rod, making them an integral structure, which improves the connection strength between them, and makes the entire two-stage rod 3 L-shaped, which is convenient for processing and manufacturing. In other embodiments, the reinforcing rod 33 can also be formed by welding the reinforcing rod 33 together.

[0035] The first-stage rod 31 and the second-stage rod 32 are integrally formed of metal to improve the connection strength between them.

[0036] like Figure 3 and Figure 4 As shown, the rocker arm 2 includes a main body 21 and a cover plate 22. The main body 21 and the cover plate 22 cooperate to facilitate the assembly and connection between the two-stage rod 3 and the rocker arm 2. The main body 21 is provided with a mounting hole 211 and a limiting groove 212. The mounting hole 211 matches the shape of the second-stage rod 32, and the other end of the second-stage rod 32 passes through the mounting hole 211. In this embodiment, both are hexagonal, and they are interference-fitted to improve the connection strength and enhance the clamping force of the main body 21 on the second-stage rod 32.

[0037] A limiting groove 212 is provided on the side of the main body 21 adjacent to the handle 1. The reinforcing rod 33 is installed in the limiting groove 212. The limiting groove 212 facilitates the positioning and assembly of the reinforcing rod 33 and the main body 21 of the rocker arm 2. A cover plate 22 is provided on the side of the main body 21 adjacent to the handle 1, and the cover plate 22 covers the mounting hole 211 and the limiting groove 212, so that the other end of the second-stage rod 32 and the reinforcing rod 33 are reliably located inside the rocker arm 2.

[0038] A mounting cavity 213 is also provided on the side of the main body 21 adjacent to the handle 1. The mounting cavity 213 has a mounting opening facing the cover plate 22. The cover plate 22 covers the mounting opening. The mounting hole 211 communicates with the mounting cavity 213. The mounting cavity 213 facilitates the injection molding of the main body 21 and can reduce the amount of plastic material required for injection molding of the main body 21, thereby reducing costs. One end of the limiting groove 212 adjacent to the mounting hole 211 communicates with the mounting cavity 213, and the side of the limiting groove 212 facing the cover plate 22 is open. The reinforcing rod 33 includes a first sub-rod 331 and a second sub-rod 332. The first sub-rod 331 is connected between the second stage rod 32 and the second sub-rod 332. The first sub-rod 331 is located in the mounting cavity 213, and the second sub-rod 332 is limited in the limiting groove 212.

[0039] After opening the cover plate 22, the limiting groove 212 and the mounting cavity 213 are exposed, allowing the first-stage rod 31 and the second-stage rod 32 to be sequentially passed through the mounting hole 211 from the mounting opening. The second sub-rod 332 is then inserted into the limiting groove 212, where the groove wall limits the first sub-rod 331. The first sub-rod 331 is located in the mounting cavity 213, while only a portion of the reinforcing rod 33 is located in the limiting groove 212, facilitating the assembly connection between the reinforcing rod 33 and the limiting groove 212. The limiting groove 212 can apply a force to the second sub-rod 332, which is farther from the second-stage rod 32, increasing the torque and facilitating the application of rotational force to both rods 3. Preferably, the length of the first sub-rod 331 is greater than the length of the second sub-rod 332 to reduce the assembly difficulty between the reinforcing rod 33 and the limiting groove 212.

[0040] like Figure 5 and Figure 6 As shown, the cover plate 22 has a first pressing part 221 and a second pressing part 222 on the side facing the main body 21. The first pressing part 221 abuts against the first sub-rod 331 and is used to press the first sub-rod 331 into the mounting cavity 213. The second pressing part 222 abuts against the second sub-rod 332 and is used to press the second sub-rod 332 into the limiting groove 212. The first pressing part 221 and the second pressing part 222 can improve the structural strength of the cover plate 22 itself, and can also firmly position the reinforcing rod 33 between the main body 21 and the cover plate 22, thereby improving the connection strength between the reinforcing rod 33 and the rocker arm 2.

[0041] Furthermore, the second clamping part 222 and the second sub-rod 332 are arranged crosswise, and the first clamping part 221 and the first sub-rod 331 are arranged parallel to each other, so as to reliably and firmly position the reinforcing rod 33 between the main body 21 and the cover plate 22, and effectively provide structural strength to the cover plate 22.

[0042] In this embodiment, the cover plate 22 and the main body 21 are snap-fit ​​connected to facilitate assembly and disassembly. Of course, in other embodiments, the cover plate 22 and the main body 21 can also be assembled and connected by screws or other means.

[0043] like Figure 5 As shown, the handle 1 is rotatably mounted on the main body 21, and one end of the cover plate 22 extends between the handle 1 and the main body 21. The handle 1 can be used to limit the cover plate 22, preventing it from falling off the main body 21 and improving the reliability of the connection.

[0044] like Figure 4 and Figure 5 As shown, a mounting tube 224 is provided on the side of the main body 21 adjacent to the handle 1. The inner cavity of the mounting tube 224 is divided into a first inner cavity 2241 and a second inner cavity 2242 along its axial direction. The first inner cavity 2241 is connected to the side of the main body 21 away from the handle 1, and the second inner cavity 2242 is connected to the handle 1. The diameter of the first inner cavity 2241 is larger than the diameter of the second inner cavity 2242.

[0045] The two-stage hand-cranked device also includes a rotating shaft 4, which comprises a first shaft 41 and a second shaft 42 coaxially arranged. The first shaft 41 is rotatably disposed in the first inner cavity 2241, and its diameter is larger than that of the second inner cavity 2242, preventing it from entering the second inner cavity 2242. The second shaft 42 is rotatably disposed in the second inner cavity 2242. The rotating shaft 4 can be inserted into the inner cavity of the mounting tube 224 from the side of the main body 21 opposite to the handle 1.

[0046] like Figure 5 As shown, the handle 1 includes an outer cylinder 11 and an inner cylinder 12 spaced apart within the outer cylinder 11. The ends of the outer cylinder 11 and the inner cylinder 12 opposite to the main body 21 are connected to each other. The outer cylinder 11 is rotatably sleeved on the outside of the mounting tube 224, and the inner cylinder 12 is rotatably disposed within the mounting tube 224. The second shaft 42 is installed inside the inner cylinder 12, and the two are interference-fitted so that the handle 1 and the rotating shaft 4 are connected as one unit and can rotate simultaneously.

[0047] By utilizing the double-layer structure of the outer cylinder 11 and the inner cylinder 12 of the handle 1, and with the mounting tube 224 located between the outer cylinder 11 and the inner cylinder 12, the stability and reliability of the handle 1 rotation can be improved, ensuring that the handle 1 rotates flexibly.

[0048] During assembly, the handle 1 can be installed from one side of the main body 21 to the mounting tube 224, and the rotating shaft 4 can be inserted from the other side of the main body 21 into the mounting tube 224. The second shaft 42 of the rotating shaft 4 can be inserted into the inner cylinder 12 of the handle 1, so that the rotating shaft 4 is fixedly connected to the handle 1, thereby reliably installing the handle 1 on the main body 21. The installation of the handle 1 is convenient and quick. At the same time, one end of the cover plate 22 is limited between the outer cylinder 11 of the handle 1 and the main body 21, ensuring the reliability of the connection between the cover plate 22 and the main body 21.

[0049] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A two-stage hand-cranked device, characterized in that, It includes a handle, a rocker arm, and two-stage levers. The handle and the two-stage levers are respectively located at both ends of the rocker arm and are located on opposite sides of the rocker arm. The two-stage lever includes a first-stage lever, a second-stage lever, and a reinforcing lever. Both the first-stage lever and the second-stage lever are polygonal levers and are coaxially arranged. One end of the first-stage lever is located at one end of the second-stage lever, and the outer periphery of the second-stage lever protrudes beyond the outer periphery of the first-stage lever. The other end of the second-stage lever is installed on the rocker arm and is fixedly connected to the reinforcing lever. The reinforcing lever is located inside the rocker arm and extends toward the handle.

2. The two-stage hand-cranked device according to claim 1, characterized in that, The reinforcing rod and the second-level rod are formed by bending the same metal rod.

3. The two-stage hand-cranked device according to claim 2, characterized in that, The first-stage rod and the second-stage rod are integrally formed from metal.

4. The two-stage hand-cranked device according to claim 1, characterized in that, Both the first-stage rod and the second-stage rod are hexagonal rods, and the axial length of the first-stage rod is less than or equal to the distance between opposite sides of the first-stage rod.

5. The two-stage hand-cranked device according to any one of claims 1-4, characterized in that, The rocker arm includes a main body and a cover plate; the main body is provided with a mounting hole and a limiting groove, the mounting hole is matched with the shape of the second-stage rod and is interference-fitted; the limiting groove is provided on the side of the main body adjacent to the handle, and the reinforcing rod is installed in the limiting groove; the cover plate is provided on the side of the main body adjacent to the handle, and the cover plate covers the mounting hole and the limiting groove.

6. The two-stage hand-cranked device according to claim 5, characterized in that, The main body is provided with a mounting cavity on the side adjacent to the handle. The mounting cavity has a mounting opening facing the cover plate, and the cover plate covers the mounting opening. The mounting hole communicates with the mounting cavity. One end of the limiting groove adjacent to the mounting hole communicates with the mounting cavity, and the side of the limiting groove facing the cover plate is open. The reinforcing rod includes a first sub-rod and a second sub-rod. The first sub-rod is connected between the second stage rod and the second sub-rod. The first sub-rod is located in the mounting cavity, and the second sub-rod is limited in the limiting groove.

7. The two-stage hand-cranked device according to claim 6, characterized in that, The cover plate has a first pressing part and a second pressing part on the side facing the main body. The first pressing part abuts against the first sub-rod and the two are arranged in parallel, and is used to press the first sub-rod into the mounting cavity. The second pressing part abuts against the second sub-rod and the two are arranged crosswise, and is used to press the second sub-rod into the limiting groove.

8. The two-stage hand-cranked device according to claim 5, characterized in that, The handle is rotatably mounted on the main body, and one end of the cover plate extends between the handle and the main body.

9. The two-stage hand-cranked device according to claim 5, characterized in that, An installation tube is provided on the side of the main body adjacent to the handle. The inner cavity of the installation tube is divided into a first inner cavity and a second inner cavity along its axial direction. The first inner cavity is connected to the side of the main body opposite to the handle, and the second inner cavity is connected to the handle. The diameter of the first inner cavity is larger than the diameter of the second inner cavity. The two-stage hand-cranked device further includes a rotating shaft, which comprises a first shaft and a second shaft coaxially arranged. The first shaft is rotatably disposed in the first inner cavity, and its diameter is larger than the diameter of the second inner cavity; the second shaft is rotatably disposed in the second inner cavity. The handle includes an outer cylinder and an inner cylinder spaced apart inside the outer cylinder. The outer cylinder and the inner cylinder are connected to each other at their ends away from the main body. The outer cylinder is rotatably sleeved outside the mounting tube, and the inner cylinder is rotatably disposed inside the mounting tube. The second shaft is installed inside the inner cylinder, and the two are interference-fitted.

10. A desk and chair for lunch break, characterized in that, Includes the two-stage hand-cranked device as described in any one of claims 1-9.

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