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Blackboard compasses for teaching

A compass and blackboard technology, which is applied in the field of blackboard compasses for teaching, can solve problems such as dislocation, irregular circle drawing, and easily damaged blackboard surface

Pending Publication Date: 2018-05-11
徐靖雅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Among the current teaching tools, compasses are a commonly used drawing tool for teachers. At present, most of the compasses distributed by schools to teachers are wooden simple compasses. The blackboard is not easy to fix, and when drawing circles, misalignment errors often occur, resulting in irregular drawing circles, and it is easy to damage the surface of the blackboard

Method used

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  • Blackboard compasses for teaching
  • Blackboard compasses for teaching

Examples

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-5 As shown, a blackboard compass for teaching includes hinged legs A10 and B17, and the legs A10 and B17 are hinged through screws 18 and wing nuts 19 to facilitate manual locking.

[0024] The universal ball 9 is fixedly arranged at the bottom of the support leg A10, and the universal ball 9 is rotatably fitted in the universal ball seat 8. Universal ball seat 8 includes universal ball seat A8a and universal ball seat B8b fixed by self-tapping screws A7. The upper end of the universal ball seat 8 is a bowl 8c matched with the universal ball 9, and the lower end is provided with a cavity 8d. The outside of the cavity 8d is fixedly provided with a suction bowl fixing frame 5, and the bottom of the suction bowl fixing frame 5 is fixedly provided with a suction bowl 2. In the cavity 8d, the centering pin 4 is elastically matched with the provided ...

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PUM

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Abstract

The invention belongs to the technical field of teaching appliances, and relates to blackboard compasses for teaching. The blackboard compasses comprise a supporting leg A and a supporting leg B whichare in hinged cooperation. A universal ball is fixedly arranged at the bottom of the supporting leg A and is arranged in a universal ball seat in a running fit manner. A suction cup fixing frame is fixedly arranged on the outer portion of the lower end of the universal ball seat, and suction cups are fixedly arranged at the bottom of the suction cup fixing frame. A centering pin is arranged in the lower end of the universal ball seat in an elastic fit manner. The centering pin penetrates out from the middle of the suction cup fixing frame. An elastic chalk clamp is fixedly arranged at the bottom of the supporting leg B. The blackboard compasses for teaching are reasonable in design; through the function of the three-foot suction cup fixing frame and the suction cups, locating and fixing of the centering pin are effectively guaranteed; through the centering pin arranged in the universal ball seat in the elastic fit manner, it is effectively guaranteed that the centering pin can be in contact with a blackboard all the time, and it is guaranteed that the center does not deviate; and through the elastic chalk clamp, chalks can be clamped conveniently and stably.

Description

technical field [0001] The invention belongs to the technical field of teaching tools, in particular to a blackboard compasses for teaching. Background technique [0002] Among the current teaching tools, compasses are a commonly used drawing tool for teachers. At present, most of the compasses distributed by schools to teachers are wooden simple compasses. The blackboard is not easy to fix, and when drawing circles, misalignment errors often occur, resulting in irregular drawing circles, and it is easy to damage the surface of the blackboard. Contents of the invention [0003] Aiming at the problems existing in the prior art, the object of the present invention is to design and provide a technical solution for blackboard compasses for teaching. [0004] The described blackboard compasses for teaching comprises hinged legs A and B, which are characterized in that the bottom of the legs A is fixed with a universal ball, and the universal ball is rotatably fitted on the uni...

Claims

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Application Information

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IPC IPC(8): B43L9/02B43L12/00B43K23/016
CPCB43K23/016B43L9/02B43L12/00
Inventor 徐靖雅
Owner 徐靖雅
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