Wet and dry dual-purpose blackboard eraser
By setting up a central partition and a rotary adjustment device in the blackboard eraser, the function of dry and wet is realized, the dust and water stains are solved, and classroom efficiency and health and safety are improved.
Patent Information
- Application Number
- CN202323506336.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2033-12-22
AI Technical Summary
Existing blackboard wipes are prone to dust after cleaning, which affects teachers' health. At the same time, water stains left after wiping a wet rag will affect classroom efficiency.
A dry and wet blackboard eraser is designed. By setting a central partition in the main body of the wipe, it is divided into a solid part and a hollow part. The outer surface of the solid part is covered with dry cloth, the outer side of the hollow part is covered with wet cloth, the hollow part cavity is filled with water, and a rotation adjustment device and a fixing device are provided.
It achieves dust-free and good erasing effect while avoiding water stains, improving classroom efficiency, and protecting the health of teachers and students.
Smart Images
Figure CN222538577U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of teaching auxiliary products, in particular to a wet and dry dual-purpose blackboard eraser. Background Art
[0002] The cleaning effect of the old-fashioned blackboard eraser is poor. After cleaning, the blackboard will often become hazy, affecting the display effect and generating a lot of dust, which seriously harms the health of front-line teachers. In order to avoid the generation of dust, some teachers will use wet rags to clean the blackboard. Although wet rags can avoid dust, they will leave water stains after wiping, affecting the writing of chalk and thus affecting the efficiency of the class.
[0003] However, dust-free chalks, markers, whiteboards, smart blackboards, etc. are only widely used due to their high prices. Therefore, a new type of teaching aid that is convenient, fast, and economical needs to be studied urgently. Utility Model Content
[0004] The utility model aims to solve the problems mentioned in the background technology and provides a wet and dry dual-purpose blackboard eraser.
[0005] In order to solve the above technical problems, the utility model provides a technical solution: a wet and dry dual-purpose blackboard eraser, comprising an eraser body, wherein two ends of the eraser body are respectively provided with a rotation adjustment device and a fixing device;
[0006] The cross section of the eraser body is an ellipse, a central partition is provided inside the eraser body, the central partition is located at the minor axis of the cross section ellipse, the central partition divides the eraser body into a solid part and a hollow part, the outer surface of the solid part is covered with a dry cloth, the outer side of the hollow part is covered with a wet cloth, the cavity of the hollow part is filled with water, water injection holes are provided at both ends of the eraser body, and the water injection holes are located in the hollow part of the eraser body;
[0007] The rotation adjustment device comprises a rotation frame, a rotation double rod body and a pressing part, wherein the rotation frame is fixedly connected to the blackboard frame, the rotation double rod body comprises two connecting rods, the two connecting rods are embedded in the limiting ring at the end of the eraser body, four limiting holes are evenly arranged on the limiting ring, the connecting rod has different diameters at both ends, the end with a larger diameter is embedded in the limiting hole, and a spring is arranged in the limiting hole;
[0008] The two connecting rods are fixedly connected to the cylindrical pressing part, and a handle for pressing is provided at the center of the end of the pressing part away from the eraser body;
[0009] The fixing device is fixedly connected to the blackboard frame, and the blackboard eraser body rotates in the fixing device.
[0010] As a preferred solution, micropores are provided on the surface of the hollow portion for allowing the internal water to seep out to the wet cloth, thereby keeping the wet cloth continuously moist.
[0011] As a preferred solution, the end of the connecting rod with a larger diameter is directly larger than the width of the limiting ring, and the end of the connecting rod with a smaller diameter is smaller than the width of the limiting ring.
[0012] As a preferred solution, the fixing device includes a detachable cover to facilitate installation and removal of the eraser body.
[0013] As a preferred solution, a bearing installation groove is provided between the eraser body and the rotation adjustment device and the fixing device, and a bearing is provided in the bearing installation groove.
[0014] Compared with the prior art, the utility model has the advantages of clear structure and convenient use. By setting a central partition and dividing the solid part and the hollow part, the function of wet and dry use is realized. By setting up a rotating adjustment device, the angle and position of the blackboard eraser can be easily adjusted; the rotating double-rod design in the rotating adjustment device not only ensures the stability of the blackboard eraser; the detachable fixing device makes maintenance and cleaning convenient and fast; it achieves dust-free, good erasing effect, write as you erase, and convenient and fast effects, which can not only improve the efficiency of class, but also protect the health of teachers and students from dust pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model.
[0016] Figure 2 It is a transverse sectional view of the main body of the blackboard eraser of the utility model.
[0017] Figure 3 It is a longitudinal sectional view of the utility model.
[0018] Figure 4 It is a structural schematic diagram of the limit ring of the utility model.
[0019] As shown in the figure: 1. eraser body, 2. rotating adjustment device, 3. fixing device, 4. center partition, 5. solid part, 6. hollow part, 7. water injection hole, 8. connecting rod, 9. pressing part, 10. limiting ring, 11. limiting hole, 12. spring, 13. handle, 14. bearing mounting groove, 501, dry cloth, 601, wet cloth. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0021] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0022] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0023] In the description of the embodiments of the present invention, "multiple" means at least 2.
[0024] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0025] In conjunction with the accompanying drawings, a wet and dry dual-purpose blackboard eraser comprises an eraser body 1, wherein two ends of the eraser body 1 are respectively provided with a rotation adjustment device 2 and a fixing device 3;
[0026] The cross section of the eraser body 1 is elliptical, a central partition 4 is provided inside the eraser body 1, the central partition 4 is located at the minor axis of the cross-sectional ellipse, the central partition 4 divides the eraser body 1 into a solid portion 5 and a hollow portion 6, the outer surface of the solid portion 5 is covered with a dry cloth 501, the outer side of the hollow portion 6 is covered with a wet cloth 601, the cavity of the hollow portion 6 is filled with water, water injection holes 7 are provided at both ends of the eraser body 1, and the water injection holes 7 are located in the hollow portion 6 of the eraser body 1;
[0027] The rotation adjustment device 2 includes a rotation frame, a rotation double rod body and a pressing portion 9, wherein the rotation frame is fixedly connected to the blackboard frame, and the rotation double rod body includes two connecting rods 8, which are embedded in a limiting ring 10 at the end of the eraser body 1, and four limiting holes 11 are evenly arranged on the limiting ring 10, and the connecting rod 8 has different diameters at both ends, and the end with a larger diameter is embedded in the limiting hole 11, and a spring 12 is arranged in the limiting hole 11;
[0028] The two connecting rods 8 are fixedly connected to a cylindrical pressing portion 9, and a handle 13 for pressing is provided at the center of the end of the pressing portion 9 away from the eraser body 1;
[0029] The fixing device 3 is fixedly connected to the blackboard frame, and the eraser body 1 rotates inside the fixing device 3 .
[0030] The surface of the hollow portion 6 is provided with micropores for the internal water to seep out to the wet cloth 601 , so that the wet cloth 601 remains continuously moist.
[0031] The end of the connecting rod 8 with a larger diameter is directly larger than the width of the limiting ring 10 , and the end of the connecting rod 8 with a smaller diameter is smaller than the width of the limiting ring 10 .
[0032] The fixing device 3 comprises a detachable cover to facilitate the installation and removal of the eraser body 1 .
[0033] A bearing installation groove 14 is provided between the eraser body 1 and the rotation adjustment device 2 and the fixing device 3, and a bearing is provided in the bearing installation groove 14.
[0034] The utility model can realize the functions of erasing with one pull, cleaning with one wipe, and writing at the same time as erasing when being implemented. The device comprises a rotation adjustment device, an eraser body (elliptical cylinder), a bearing, a central partition, and a fixing device (detachable).
[0035] The main body of the eraser is an elliptical cylinder, with the short axes of the two elliptical sections as the central partition, one side is solid and the other side is hollow. The solid side is the dry side of the eraser, and the outer surface is covered with a dry cloth; the hollow side is the wet side of the eraser, and the outer surface is covered with a wet cloth. The right port of the hollow side is equipped with a water inlet for adding water, and the surface of the hollow side has micropores, which can allow the water inside to seep out to keep the wet cloth continuously moist.
[0036] In order to realize the function of writing and erasing at the same time, a rotation adjustment device is provided, which can realize the effect of rotating at will and stopping accurately. The rotation adjustment device is composed of a rotating frame and a rotating double rod body. The connecting rod of the rotating double rod body is designed to be thin at the top and thick at the bottom. It is embedded in the main body of the eraser, but it is not fixedly connected and can be pulled out. The connecting rod is connected to a convex-shaped device outward, and a fixed connection is made here and cannot be separated. The embedding part of the main body of the eraser and the connecting rod is dug with a hole, the diameter of which is the diameter of the thick part of the connecting rod, and the depth is 1.5 times the length of the thick part of the connecting rod. A built-in spring is connected to the main body of the eraser. The natural length of the spring is slightly larger than the length of the thick part of the connecting rod. The length after compression is about half the length of the thick part of the connecting rod, which can just make the other half of the thick part exposed outside embedded in the main body of the eraser. A circular limiting hole is made on the upper, lower, left and right sides of the limiting ring at the end of the main body of the eraser, and the diameter is the diameter of the thick part of the connecting rod. The interval width of the remaining rotating parts is the diameter of the thin part of the connecting rod. When pressed inward, the thin part contacts the rotating frame and can rotate freely. When the target position is reached and the hand is released, the spring force will make the thick part contact the rotating frame again and get stuck in the designed limit ring, so as to achieve the effect of free rotation and precise stop. When the long axis of a section of the elliptical cylinder is perpendicular to the board surface, the main body of the eraser is in close contact with the board surface. The long axis end is either a wet cloth (cleaning) or a dry cloth (wiping dry). When the short axis is perpendicular to the board surface, the eraser will have a certain distance from the board surface (the distance length is the long axis length minus the short axis length). At this time, the eraser will not affect the board surface, and the board surface can slide freely.
[0037] In order to achieve the goal of convenient disassembly and cleaning, a middle detachable fixture is designed on the right side. The outer side of the fixture is welded to the main frame of the blackboard, and there is a detachable cover in the middle. The main body can be disassembled by pulling outwards to achieve the disassembly effect. The distance between the cover and the outer side is exactly equal to the diameter of the double rod on the right side.
[0038] The utility model is suitable for a pullable split blackboard, including but not limited to a four-partition blackboard that can be pulled up and down and a two-partition blackboard that can be pulled left and right.
[0039] The above describes the utility model and its implementation methods, which are not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and do not deviate from the purpose of the invention of the utility model, they can creatively design a structure and embodiment similar to the technical solution, which should belong to the protection scope of the utility model.
Claims
1. A wet and dry blackboard eraser, characterized in that: It comprises a blackboard eraser body, and two ends of the blackboard eraser body are respectively provided with a rotation adjustment device and a fixing device; The cross section of the eraser body is an ellipse, a central partition is provided inside the eraser body, the central partition is located at the minor axis of the cross section ellipse, the central partition divides the eraser body into a solid part and a hollow part, the outer surface of the solid part is covered with a dry cloth, the outer side of the hollow part is covered with a wet cloth, the cavity of the hollow part is filled with water, water injection holes are provided at both ends of the eraser body, and the water injection holes are located in the hollow part of the eraser body; The rotation adjustment device comprises a rotation frame, a rotation double rod body and a pressing part, wherein the rotation frame is fixedly connected to the blackboard frame, the rotation double rod body comprises two connecting rods, the two connecting rods are embedded in the limiting ring at the end of the eraser body, four limiting holes are evenly arranged on the limiting ring, the connecting rod has different diameters at both ends, the end with a larger diameter is embedded in the limiting hole, and a spring is arranged in the limiting hole; The two connecting rods are fixedly connected to the cylindrical pressing part, and a handle for pressing is provided at the center of the end of the pressing part away from the eraser body; The fixing device is fixedly connected to the blackboard frame, and the blackboard eraser body rotates in the fixing device.
2. A wet and dry blackboard eraser according to claim 1, characterized in that: The surface of the hollow part is provided with micropores, which are used for the internal water to seep out to the wet cloth, so that the wet cloth can be kept continuously moist.
3. A wet and dry blackboard eraser according to claim 1, characterized in that: The end of the connecting rod with a larger diameter is directly larger than the width of the limiting ring, and the end of the connecting rod with a smaller diameter is smaller than the width of the limiting ring.
4. A wet and dry blackboard eraser according to claim 1, characterized in that: The fixing device comprises a detachable cover to facilitate the installation and removal of the eraser body.
5. A wet and dry blackboard eraser according to claim 1, characterized in that: A bearing installation groove is arranged between the eraser body, the rotation adjustment device and the fixing device, and a bearing is arranged in the bearing installation groove.