CN217863490U

CN217863490U - A portable blackboard eraser device for teaching

Info

Publication number: CN217863490U
Application number: CN202123081623.0U
Authority: CN
Inventors: 陈武鹏
Original assignee: Guangxi Polytechnic Vocational Technical School
Current assignee: Guangxi Polytechnic Vocational Technical School
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-11-22
Anticipated expiration: 2031-12-09

Abstract

The utility model discloses a portable blackboard eraser device for teaching, including blackboard eraser main part, blackboard eraser main part's bottom demountable installation has the bottom plate, just the both sides on bottom plate top all are fixed with the riser, and the top of riser extends to blackboard eraser main part's inside, the lower surface mounting of bottom plate has the brush face, the both sides of blackboard eraser main part bottom all are fixed with the locating piece, be provided with the recess on the inner wall of locating piece one side, just be fixed with return spring on the inner wall of recess one side, the inside one end slidable mounting of locating piece has the locating lever, the one end of locating lever is fixed with the dog, and the dog is kept away from the one end and the return spring contact of each other of locating lever. The utility model discloses but not only the free rotation, it is comparatively nimble to clean the angle, strengthens the use convenience of blackboard eraser to through the components of a whole that can function independently structure of dismantlement formula, reduce the use cost of blackboard eraser.

Description

A portable blackboard eraser device for teaching

Technical Field

The utility model relates to a blackboard eraser technical field specifically is a portable blackboard eraser device for teaching.

Background

The blackboard eraser is a tool for erasing chalk marks on a blackboard, belongs to frequently-used teaching tools, and generally comprises an erasing surface, a shell and a brush, wherein the erasing surface is of an annular structure, and the structure can ensure that the erasing, dust collection and sweeping of dust are respectively carried out inside and outside the shell, so that dust is prevented from flying upward.

The blackboard eraser device in the market is various, can satisfy people's user demand basically, but still has certain weak point, and current this kind of blackboard eraser device is stained with the chalk dust on using the blackboard after a period, is difficult to clean the blackboard, and the face of wiping in addition in case the damage appears and often is thrown away by whole, has increased teaching aid's use cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a portable blackboard eraser device for teaching to it is comparatively single to propose blackboard eraser device structure in solving above-mentioned background art, is difficult to continue to change the problem of continuation use.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a portable blackboard eraser device for teaching, includes blackboard eraser main part, the bottom demountable installation of blackboard eraser main part has the bottom plate, just the both sides on bottom plate top all are fixed with the riser, and the top of riser extends to the inside of blackboard eraser main part, the lower surface mounting of bottom plate has the brush face, the both sides of blackboard eraser main part bottom all are fixed with the locating piece, be provided with the recess on the inner wall of locating piece one side, just be fixed with return spring on the inner wall of recess one side, the inside one end slidable mounting of locating piece has the locating lever, the one end of locating lever is fixed with the dog, and the dog keeps away from the one end and return spring contact each other of locating lever, the top of locating lever extends to the outside of riser, prefabricated groove has all been seted up on the both sides outer wall of blackboard eraser main part, just the inside slidable mounting of prefabricated groove has the connecting block, and the one end of connecting block extends to the inside of blackboard eraser main part and is connected with the fixed surface of dog, the central point department of blackboard eraser main part top rotates installs outer fixed ring, just one side rotation on outer fixed ring surface installs the ring, the inside one end of ring is fixed with the connecting axle.

Preferably, a bearing main body is installed at the center of the bottom of the blackboard eraser main body, a middle shaft is rotatably installed inside the bearing main body, the top end of the middle shaft extends to the outside of the blackboard eraser main body, and the outer fixing ring is fixed on the outer peripheral surface of the middle shaft.

Preferably, the outer walls of the two sides of the blackboard eraser main body are provided with positioning holes, the cross sections of the positioning holes are circular, and the inner diameters of the positioning holes are larger than the outer diameters of the positioning rods.

Preferably, a magnetic stone is fixed at the top end of the middle shaft, and the upper section of the magnetic stone is circular or rectangular.

Preferably, the bearing body is a roller bearing or a ball bearing.

Preferably, a supporting block is fixed on the outer wall of one side of the positioning block, one end of the positioning rod extends to the outside of the supporting block, and the inner diameter of the supporting block is larger than the outer diameter of the positioning rod.

Compared with the prior art, the beneficial effects of the utility model are that: the portable blackboard eraser device for teaching can rotate freely, the erasing angle is flexible, the use convenience of the blackboard eraser is enhanced, and the use cost of the blackboard eraser is reduced through a detachable split structure;

(1) The ring is turned by arranging a structure with the ring, the bearing main body and the middle shaft which are matched with each other, so that the ring rotates around the connecting shaft, namely the ring and the blackboard eraser main body form a certain included angle, then a user passes a middle finger through the ring, the blackboard eraser main body is hung on the hand of the user through the ring, the blackboard eraser main body can freely rotate under the limit of the bearing main body and the middle shaft, and the wiping angle is flexible;

(2) The connecting block drives the stop block and the positioning rod to horizontally move through the mutually matched structures such as the stop block and the positioning rod, when the end part of the positioning rod is completely withdrawn to the outside of the vertical plate, the vertical plate loses the fixation limit, and then a user can pull the bottom plate downwards, namely the disassembly work of the brush surface is completed, the user is helped to quickly complete the replacement work of easily damaged parts, and the use cost of the blackboard eraser is reduced through the detachable split structure;

(3) Through being provided with magnetism and inhale stone structure of mutually supporting such as, the top of blackboard eraser main part is a horizontal plane, will indicate the ring lock afterwards for magnetism is inhaled the stone and is adsorbing back on the blackboard, is parallel state with the blackboard, thereby keeps under the prerequisite that the blackboard eraser used the flexibility, still can make it adsorb on the blackboard, improves the use convenience of blackboard eraser.

Drawings

Fig. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic view of the main sectional structure of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2 according to the present invention;

fig. 4 is a schematic side view of the present invention;

fig. 5 is a schematic top view of the present invention;

in the figure: 1. a blackboard eraser main body; 2. a base plate; 201. rubbing the surface with hair; 202. a vertical plate; 3. a middle shaft; 4. Magnetically attracting the stone; 5. an outer fixing ring; 6. a ring; 601. a connecting shaft; 7. a bearing body; 8. positioning blocks; 9. positioning holes; 10. a groove; 11. a return spring; 12. a stopper; 13. positioning a rod; 14. a resisting block; 15. pre-groove preparation; 16. and (4) connecting the blocks.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides an embodiment: a portable blackboard eraser device for teaching comprises a blackboard eraser main body 1, wherein the top end of the blackboard eraser main body 1 is a horizontal plane, a bottom plate 2 is detachably mounted at the bottom end of the blackboard eraser main body 1, vertical plates 202 are fixed on two sides of the top end of the bottom plate 2, the top ends of the vertical plates 202 extend into the blackboard eraser main body 1, a brush surface 201 is mounted on the lower surface of the bottom plate 2, positioning holes 9 are formed in the outer walls of two sides of the blackboard eraser main body 1, the cross sections of the positioning holes 9 are circular, and the inner diameters of the positioning holes 9 are larger than the outer diameter of positioning rods 13;

positioning blocks 8 are fixed on two sides of the bottom of the blackboard eraser main body 1, a groove 10 is formed in the inner wall of one side of the positioning block 8, a return spring 11 is fixed on the inner wall of one side of the groove 10, a positioning rod 13 is slidably mounted at one end inside the positioning block 8, a stop block 12 is fixed at one end of the positioning rod 13, one end, away from the positioning rod 13, of the stop block 12 is in contact with the return spring 11, the top end of the positioning rod 13 extends to the outside of the vertical plate 202, a resisting block 14 is fixed on the outer wall of one side of the positioning block 8, one end of the positioning rod 13 extends to the outside of the resisting block 14, and the inner diameter of the resisting block 14 is larger than the outer diameter of the positioning rod 13;

the outer walls of two sides of the blackboard eraser body 1 are provided with prefabricated grooves 15, connecting blocks 16 are installed inside the prefabricated grooves 15 in a sliding mode, one ends of the connecting blocks 16 extend into the blackboard eraser body 1 and are fixedly connected with the surfaces of the stoppers 12, the connecting blocks 16 are slid, so that the connecting blocks 16 drive the stoppers 12 and the positioning rods 13 to move horizontally, and the stoppers 12 force the return springs 11 to be in a compressed state;

when the end part of the positioning rod 13 is completely withdrawn to the outside of the vertical plate 202, the bottom plate 2 is downwards drawn, so that the vertical plate 202 is withdrawn to the outside of the blackboard eraser main body 1, the whole bottom plate 2 can be replaced, and the detachable split structure is convenient for replacing vulnerable parts on the blackboard eraser, so that the use cost of the blackboard eraser is reduced;

a bearing main body 7 is arranged at the center of the bottom of the blackboard eraser main body 1, the bearing main body 7 is a roller bearing or a spherical bearing, a middle shaft 3 is rotatably arranged in the bearing main body 7, the top end of the middle shaft 3 extends to the outside of the blackboard eraser main body 1, and the bearing main body 7 can limit the rotation of the middle shaft 3;

an outer fixing ring 5 is rotatably mounted at the center position of the top end of the blackboard eraser main body 1, the outer fixing ring 5 is fixed on the outer peripheral surface of the middle shaft 3, a finger ring 6 is rotatably mounted on one side of the surface of the outer fixing ring 5, a user can rotate the finger ring 6 to enable the finger ring 6 to be perpendicular to the blackboard eraser main body 1, a connecting shaft 601 is fixed at one end inside the finger ring 6, and the connecting shaft 601 is the turning center of the finger ring 6;

the middle finger passes through the finger ring 6, then the palm holds the blackboard eraser body 1, and a user opens the palm and rotates the blackboard eraser body 1, so that the outer fixing ring 5 drives the middle shaft 3 to rotate, namely the blackboard eraser is hung on the hand of the user through the finger ring 6, the blackboard eraser body 1 can rotate by three hundred and sixty degrees, and the use flexibility of the blackboard eraser is improved;

the top end of the middle shaft 3 is fixed with a magnetic stone 4, the upper section of the magnetic stone 4 is circular or rectangular, the finger ring 6 can be buckled, and the magnetic stone 4 at the top end of the middle shaft 3 is adsorbed to the blackboard, so that the magnetic stone 4 is adsorbed to the blackboard;

the blackboard eraser and the blackboard are in a parallel state, so that the blackboard eraser can still be adsorbed on the blackboard on the premise of keeping the use flexibility of the blackboard eraser.

When the blackboard eraser is used, firstly, a user can rotate the ring 6 to enable the ring 6 to be in a vertical state with the blackboard eraser body 1, the connecting shaft 601 is the turning center of the ring 6, then, a middle finger passes through the ring 6, then, the palm holds the blackboard eraser body 1, the user opens the palm and rotates the blackboard eraser body 1, so that the outer fixing ring 5 drives the middle shaft 3 to rotate, in the process, the bearing body 7 can limit the rotation of the middle shaft 3, namely, after the blackboard eraser is hung on the hand of the user through the ring 6, the blackboard eraser body 1 can rotate by three hundred sixty degrees, the use flexibility of the blackboard eraser is improved, after the blackboard eraser is used for a long time, the user can manually slide the connecting block 16 to enable the connecting block 16 to drive the block 12 and the positioning rod 13 to move horizontally, then the block 12 forces the return spring 11 to be in a compression state, and when the end part of the positioning rod 13 completely withdraws out of the vertical plate 202, the bottom plate 2 is pulled downwards, so that the vertical plate 202 is withdrawn to the outside of the blackboard eraser main body 1, the whole bottom plate 2 can be replaced, when the bottom plate 2 is installed, the position return spring 11 is in a compressed state, the vertical plate 202 is completely inserted into the blackboard eraser main body 1, then the connecting block 16 is loosened, the positioning rod 13 is popped out of the outside of the vertical plate 202 under the action of the elastic force of the return spring 11, so that the replacement work of the bottom plate 2 and the hair erasing surface 201 is quickly completed, the operation is quick and convenient, the easy-to-wear parts on the blackboard eraser can be replaced conveniently through a detachable split structure, the use cost of the blackboard eraser is reduced, in the process of using the blackboard eraser main body 1, the top end of the blackboard eraser main body 1 is a horizontal plane, the ring 6 can be buckled, the magnetic attraction stone 4 at the top end of the middle shaft 3 is adsorbed to the blackboard eraser, so that the magnetic attraction stone 4 is adsorbed to the blackboard eraser, the blackboard eraser is parallel to the blackboard, so that the blackboard eraser can be still adsorbed on the blackboard on the premise of keeping the use flexibility of the blackboard eraser, and the use convenience of the blackboard eraser is improved.

Claims

1. The utility model provides a portable blackboard eraser device for teaching which characterized in that: the blackboard eraser comprises a blackboard eraser main body (1), a bottom plate (2) is detachably mounted at the bottom end of the blackboard eraser main body (1), vertical plates (202) are fixed on two sides of the top end of the bottom plate (2), the top ends of the vertical plates (202) extend into the blackboard eraser main body (1), a hair erasing surface (201) is mounted on the lower surface of the bottom plate (2), positioning blocks (8) are fixed on two sides of the bottom of the blackboard eraser main body (1), a groove (10) is formed in the inner wall of one side of each positioning block (8), a return spring (11) is fixed on the inner wall of one side of the groove (10), a positioning rod (13) is slidably mounted at one end of the inner part of each positioning block (8), a stop block (12) is fixed at one end of each positioning block (12) far away from the positioning rod (13) and is in contact with the return spring (11), the top end of each positioning rod (13) extends to the outer part of the vertical plate (202), prefabricated grooves (15) are formed in the outer walls of two sides of the blackboard eraser main body (1), a connecting block (16) is slidably mounted in the prefabricated groove (15), a connecting block (5) is connected with the surface of the blackboard eraser main body (1), and one side of the surface of the outer fixing ring (5) is rotatably provided with a ring (6), and one end inside the ring (6) is fixed with a connecting shaft (601).

2. A portable blackboard eraser apparatus for teaching according to claim 1, wherein: the blackboard eraser is characterized in that a bearing main body (7) is installed at the center of the bottom of the blackboard eraser main body (1), a middle shaft (3) is rotatably installed inside the bearing main body (7), the top end of the middle shaft (3) extends to the outside of the blackboard eraser main body (1), and an outer fixing ring (5) is fixed on the outer peripheral surface of the middle shaft (3).

3. A portable blackboard eraser device for teaching according to claim 1, wherein: the blackboard eraser is characterized in that positioning holes (9) are formed in the outer walls of the two sides of the blackboard eraser body (1), the cross sections of the positioning holes (9) are circular, and the inner diameters of the positioning holes (9) are larger than the outer diameters of the positioning rods (13).

4. A portable blackboard eraser apparatus for teaching according to claim 2, wherein: the magnetic stone (4) is fixed at the top end of the middle shaft (3), and the upper section of the magnetic stone (4) is circular or rectangular.

5. A portable blackboard eraser apparatus for teaching according to claim 2, wherein: the bearing main body (7) is a roller bearing or a ball bearing.

6. A portable blackboard eraser apparatus for teaching according to claim 1, wherein: a supporting block (14) is fixed on the outer wall of one side of the positioning block (8), one end of the positioning rod (13) extends to the outside of the supporting block (14), and the inner diameter of the supporting block (14) is larger than the outer diameter of the positioning rod (13).