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Adjustable hand guard chalk sleeve with good fixing effect

An adjustable chalk cover technology, applied in the field of education and teaching, can solve the problems of inability to use, the chalk cover clamping and fixing failure, etc., and achieve the effects of increasing tactility, increasing strength, and reducing waste.

Inactive Publication Date: 2016-02-24
华蓥市阳和镇小学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide an adjustable hand-protecting chalk cover with good fixing effect, thereby solving the problem that the previous chalk cover cannot be used when the length of the chalk is too short due to clamping and fixing failure

Method used

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  • Adjustable hand guard chalk sleeve with good fixing effect
  • Adjustable hand guard chalk sleeve with good fixing effect
  • Adjustable hand guard chalk sleeve with good fixing effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] like Figure 1-Figure 3 The adjustable hand chalk case with good fixing effect includes a cylindrical elastic sheath 2 made of soft rubber material, and a plurality of evenly distributed annular thin metal sheets 22 are vulcanized inside the cylindrical elastic sheath 2 One end of the inner through hole of the cylindrical elastic sheath 2 is fixed with an elastic clamping device 3, and the outside of the elastic clamping device 3 is also provided with an adjustment device 5 for adjusting the elastic clamping device 3, and the adjustment device 5 is connected to the elastic clamping device. A return spring 4 for resetting the adjusting device 5 is also provided between the devices 3, and the other end of the inner through hole of the cylindrical elastic sheath 2 is also provided with a rigid conical head guard 21, and the middle part of the rigid conical head guard 21 is provided with a The mounting hole communicated with the through hole, the cylindrical elastic sheath ...

Embodiment 2

[0030] like Figure 4 As shown, this embodiment optimizes the elastic clamping device on the basis of Embodiment 1, specifically: the elastic clamping device 3 includes an annular fixing plate 34 fixed on the inner wall of the through hole inside the cylindrical elastic sheath 2, and the ring The end surface of the fixing plate 34 is evenly distributed with three elastic clips 33 around the circumference, and the three elastic clips 33 are respectively connected with an annular top plate 32 through a connecting plate 31, and the central axis of the annular top plate 32 coincides with the annular fixing plate 34.

[0031] In this embodiment, the chalk 1 is clamped between the three elastic clips 33. When the protruding end is too short and the chalk 1 needs to be pushed out for replenishment, the adjusting device 5 is pressed on the annular top plate 32, and the annular top plate 32 is pushed toward the chalk 1. At this time, the annular top plate 32 forces the three elastic cl...

Embodiment 3

[0034]This embodiment optimizes the adjustment device on the basis of Embodiment 2, specifically: the adjustment device 5 includes an annular gland 53, and the end surface of the annular gland 53 is provided with a push rod 51, and the return spring 4 is sleeved on the push rod 51, the middle part of the annular fixing plate 34 is provided with an adjustment hole 35, and the push rod 51 can squeeze the annular top plate 32 after passing through the adjustment hole 35, and the three elastic clips 33 are clamped or clamped by pressing the annular top plate 32. release.

[0035] The annular gland 53 of this embodiment is arranged on the outer end of the elastic clamping device 3, and its push rod 51 can squeeze the annular top plate 32 after passing through the adjustment hole 35. When the length of the chalk 1 needs to be adjusted, the annular gland 53 can be squeezed. Make it move axially along the inner through hole of the cylindrical elastic sheath 2, when the push rod 51 mov...

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Abstract

The invention discloses an adjustable hand guard chalk sleeve with a good fixing effect. The adjustable hand guard chalk sleeve comprises a barrel-shaped elastic protection sleeve body. An elastic clamping device is fixed to the barrel-shaped elastic protection sleeve body and provided with an adjusting device. The adjusting device is provided with a reset spring. The barrel-shaped elastic protection sleeve body is provided with a rigid conical protection head and further provided with a fixed device. The fixed device comprises an adjusting clamping block and a torsional spring. The adjusting clamping block is connected with a connecting rod. The connecting rod penetrates the barrel-shaped elastic protection sleeve body and then is connected with the other end of the torsional spring. An annular groove is formed in the outer side of the barrel-shaped elastic protection sleeve body. Locating steps are arranged on the two sides of the groove, and threads are arranged on the side faces of the locating steps. The adjusting clamping block is located in the groove, and a threaded face in threaded fit with the side faces of the locating steps is arranged on the side face of the adjusting clamping block. The clearance, between the adjusting clamping block and the groove, of the connecting rod is sleeved with a telescopic spring. Too short chalk can be fixed for use, and waste of chalk is reduced.

Description

technical field [0001] The invention relates to a teaching tool, which belongs to the field of education and teaching, in particular to an adjustable hand chalk cover with good fixing effect. Background technique [0002] The use of chalk writing teaching is a traditional teaching method. Nowadays, the use of blackboard chalk writing teaching has been gradually eliminated by multimedia teaching. However, in some elementary schools, middle and high schools, or some towns, small cities and poor areas, due to limited conditions, it is still only possible. Teaching with chalk writing. [0003] When using chalk to teach, teachers generally use chalk to write directly. Not only are their hands covered with chalk dust, causing damage to the skin, but also in winter or cold weather, the chalk is cold, and the hands of teachers are very easy to get cold when using it. It is damaged by frost, and if things go on like this, frostbite and finger numbness will also occur, which is not c...

Claims

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Application Information

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IPC IPC(8): B43K23/016B43K24/06
CPCB43K23/016B43K24/06
Inventor 夏永东
Owner 华蓥市阳和镇小学
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