CN204066519U - A kind of Multifunction lever presentation device of theory - Google Patents
A kind of Multifunction lever presentation device of theory Download PDFInfo
- Publication number
- CN204066519U CN204066519U CN201420314007.6U CN201420314007U CN204066519U CN 204066519 U CN204066519 U CN 204066519U CN 201420314007 U CN201420314007 U CN 201420314007U CN 204066519 U CN204066519 U CN 204066519U
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- China
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- cross bar
- support
- bar
- presentation device
- theory
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Abstract
The utility model provides a kind of Multifunction lever presentation device of theory, comprise cross bar and support bar, the upside of cross bar is provided with dismountable hook, cross bar is with scale, cross bar and support bar removably connect, and the two ends of cross bar have been threaded fine-tuning nut, cross bar are uniformly distributed the round iron ring of eight suspension counterweights, support bar is fixed on support, is equipped with several hanging holes on the upside of support, on the downside of cross bar.The utility model structure is simple, reasonable in design, and aspect observation of students is tested with starting, and alleviates the teaching load of teacher, improves the learning interest of student.
Description
Technical field
The utility model belongs to junior middle school physics teaching field, especially relates to a kind of Multifunction lever presentation device of theory.
Background technology
At present, in Physics Course, concepts many on textbook and law all need experiment to carry out to demonstrate and prove, meet student understand more intuitively and grasp knowledge, especially in the teaching of power and the arm of force, when studying the equilibrium condition of lever, teacher uses original lever teaching aid usually, these teaching aids are all made up of support and lever, the function singleness of this lever, only can demonstrate lever basic function and principle, complex operation, not portable yet, and can only be placed on lectern, can not be fixed on blackboard and carry out testing, the study of student is arranged in such impact afterwards, add difficulty of giving lessons.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of Multifunction lever presentation device of theory, and this apparatus structure is simple, reasonable in design, facilitates observation of students and starts to test, improving the learning interest of student.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of Multifunction lever presentation device of theory, comprise cross bar and support bar, the upside of described cross bar is provided with dismountable hook, described cross bar is with scale, described cross bar and described support bar removably connect, the two ends of described cross bar have been threaded fine-tuning nut, described cross bar is uniformly distributed the round iron ring of eight suspension counterweights, described support bar is fixed on support, is equipped with several hanging holes on the upside of described support, on the downside of described cross bar.
Described round iron ring is detachable round iron ring.
Hanging hole on the left of described support is connected with the hanging hole on the left of described cross bar by elastic device.
Hanging hole on the right side of described support is connected with the hanging hole on the right side of described cross bar by elastic device.
Described support bar is metal retractable support lever.
Owing to adopting technique scheme, this utility structure is simple, reasonable in design, has and facilitates observation of students and start to test, alleviate the teaching load of teacher, improve the advantage of the learning interest of student.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
In figure:
1, hook 2, cross bar 3, fine-tuning nut
4, support bar 5, support 6, round iron ring
7, hanging hole
Embodiment
As shown in Figure 1, a kind of Multifunction lever presentation device of theory, comprise cross bar 2 and support bar 4, cross bar 2 can rotate around the top of support bar 4, support bar 4 can disassemble from cross bar, the upside of cross bar 2 is provided with dismountable hook 1, cross bar 2 is with scale, support bar 4 is metal retractable support lever 4, the two ends of cross bar 2 have been threaded fine-tuning nut 3, cross bar 2 is uniformly distributed the detachable round iron ring 6 of eight suspension counterweights, support bar 4 is fixed on support 5, is equipped with several hanging holes 7 on the upside of support 5, on the downside of cross bar 2.Hanging hole 7 on the left of support 5 is connected with the hanging hole 7 on the left of cross bar 2 by spring, and the hanging hole 7 on the right side of support 5 is connected with the hanging hole 7 on the right side of cross bar 2 by spring.
Support bar 4 is connected with arm of force dip stick one end with the junction of cross bar 2, and arm of force dip stick can rotate around the junction of support bar 4 with cross bar 2.
The course of work of this example:
Dismantle support bar 4 and support 5, device can be suspended on blackboard with hook 1 and to demonstrate lever principle experiment by teacher.
To dismantle hook 1, round iron ring 6, this device is placed on lectern, or device is suspended on blackboard by round iron of dismantling ring 6, with the pin joint of cross bar 2 and support bar 4 for fulcrum, the spring on the left of support bar 4 is resistance to the power that cross bar 2 applies, and the direction of resistance is the direction of the spring on the left of support bar 4, rotary arm dip stick, exert all one's strength arm measure chi perpendicular to the spring on the left of support bar 4, then the distance from pin joint to vertical point is resistance arm, writes down resistance arm numerical value; Spring on the right side of support bar is power to the power that cross bar 2 applies, the direction of power is the direction of spring on the right side of support bar 4, rotary arm dip stick, and arm measure chi of exerting all one's strength is perpendicular to the spring on the right side of support bar 4, distance then from pin joint to vertical point is power arm, writes down power arm numerical value.
The position of adjustment spring, when the resistance arm of force is greater than power arm, power is greater than resistance, is now effort lever, when resistance arm is less than power arm time, power is less than resistance, is now laborsaving lever, when resistance arm equals power arm time, power equals resistance, is now bascule.This practicality makes student be easier to understand lever principle, effort lever, laborsaving lever and these knowledge of bascule, greatly improves classroom and to give lessons effect.
Above an embodiment of the present utility model has been described in detail, but described content being only preferred embodiment of the present utility model, can not being considered to for limiting practical range of the present utility model.All equalizations done according to the utility model application range change and improve, and all should still belong within patent covering scope of the present utility model.
Claims (5)
1. a Multifunction lever presentation device of theory, comprise cross bar and support bar, dismountable hook is provided with in the middle of the upside of described cross bar, described cross bar is with scale, it is characterized in that: described cross bar and described support bar removably connect, the two ends of described cross bar have been threaded fine-tuning nut, described cross bar are uniformly distributed the round iron ring of eight suspension counterweights, described support bar is fixed on support, is equipped with several hanging holes on the upside of described support, on the downside of described cross bar.
2. Multifunction lever presentation device of theory according to claim 1, is characterized in that: described round iron ring is detachable round iron ring.
3. Multifunction lever presentation device of theory according to claim 1, is characterized in that: the hanging hole on the left of described support is connected with the hanging hole on the left of described cross bar by elastic device.
4. Multifunction lever presentation device of theory according to claim 1, is characterized in that: the hanging hole on the right side of described support is connected with the hanging hole on the right side of described cross bar by elastic device.
5. Multifunction lever presentation device of theory according to claim 1, is characterized in that: described support bar is metal retractable support lever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420314007.6U CN204066519U (en) | 2014-06-13 | 2014-06-13 | A kind of Multifunction lever presentation device of theory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420314007.6U CN204066519U (en) | 2014-06-13 | 2014-06-13 | A kind of Multifunction lever presentation device of theory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204066519U true CN204066519U (en) | 2014-12-31 |
Family
ID=52207979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420314007.6U Expired - Fee Related CN204066519U (en) | 2014-06-13 | 2014-06-13 | A kind of Multifunction lever presentation device of theory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204066519U (en) |
-
2014
- 2014-06-13 CN CN201420314007.6U patent/CN204066519U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20160613 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |