CN204136646U - A kind of multifunctional teaching ruler - Google Patents

Abstract

The utility model provides a kind of multifunction teaching folding ruler, comprises rotating shaft and the compass foot of chi and lower chi in chi, lower chi, connection.The long limit of upper chi is provided with scale, and upper chi one end is provided with rotating shaft through hole, and upper chi bottom surface arranges the first groove, arranges Laser Measuring hornwork, PPT page turner, laser pointer and Automatic compasses module in the first groove; The lower long limit of chi is provided with scale, and lower chi one end is provided with rotating shaft through hole; Rotating shaft inserts rotating shaft through hole and connects upper chi and lower chi, and lower chi rotates centered by rotating shaft; Compass foot is chi shape, and one end is provided with telescopic shaft through hole, and telescopic shaft inserts telescopic shaft through hole and is connected with rotating shaft, and compass foot rotates centered by rotating shaft; Compass foot bottom surface arranges the sliding tray distally extended for starting point with telescopic shaft through hole, arranges chalk slide block in sliding tray.The multifunction teaching folding ruler that the utility model provides integrates multiple teaching aid for drawing, rational in infrastructure, easy to use, compact.

Description

A kind of multifunctional teaching ruler

Technical field

The utility model belongs to teaching field, particularly a kind of multifunctional teaching ruler.

Background technology

At current classroom teaching, teacher uses diversified educational aid, although have high-tech computer and projecting apparatus, the use of blackboard still occupies very large proportion in teaching, especially mathematics class.How need in the teaching of mapping several, we often can see teacher and use various wooden teaching aid.These teaching aid volumes are large, and function singleness, is neither easy to carry, and using neither be very convenient.In view of the problems referred to above of existing teaching aid, when teacher draws complex figure on blackboard, the mode that frequent use hand is drawn, although this mode can make figure soon, but depart from ruler, figure there will be non-type situation unavoidably, even can affect the understanding of student time serious, has influence on the teaching in classroom.

Summary of the invention

In order to overcome the deficiency in prior art, the utility model provides one to integrate multiple teaching aid for drawing, the multifunctional teaching ruler of rational in infrastructure, easy to use, compact.

A kind of multifunction teaching folding ruler, comprises rotating shaft and the compass foot of chi and lower chi in chi, lower chi, connection.The long limit of upper chi is provided with scale, and upper chi one end is provided with rotating shaft through hole, and upper chi bottom surface arranges the first groove, arranges Laser Measuring hornwork, PPT page turner, laser pointer and Automatic compasses module in the first groove; The lower long limit of chi is provided with scale, and lower chi one end is provided with rotating shaft through hole; Rotating shaft inserts rotating shaft through hole and connects upper chi and lower chi, and lower chi rotates centered by rotating shaft; Compass foot is chi shape, and one end is provided with telescopic shaft through hole, and telescopic shaft inserts telescopic shaft through hole and is connected with rotating shaft, and compass foot rotates centered by rotating shaft; Compass foot bottom surface arranges the sliding tray distally extended for starting point with telescopic shaft through hole, arranges chalk slide block in sliding tray.

As a modification of the present invention, rotating shaft comprises axle top cover, rotary sleeve, travelling gear, sleeve: axle top cover, and its bottom surface is provided with the second groove, and the second groove inner wall is provided with internal thread; Rotary sleeve, in cylinder, its radial diameter is identical with rotating shaft through-hole diameter, and its upper bottom surface diameter is less than axle top cover bottom surface diameter, upper bottom surface is provided with columniform first projection, and the first protruding sidewall is provided with the external screw thread matched with the second groove inner wall internal thread; Bottom surface is provided with the 3rd groove, and the center of the 3rd groove floor arranges ratchet shaft, and ratchet shaft is arranged perpendicular to the upper bottom surface of rotary sleeve; Rotary sleeve sidewall is provided with the window of the second groove; The projection of annular is set along bottom surface edge; Travelling gear, travelling gear excircle is provided with the gear teeth, and bottom surface is provided with ratchet recesses, and the inwall of ratchet recesses is provided with the ratchet gear teeth, and travelling gear upper bottom surface center is provided with the first ratchet shaft through hole, and travelling gear is enclosed within ratchet shaft by the first ratchet shaft through hole; Sleeve comprises in cylindrical base, is arranged on the cylindrical insertion tube of base bottom surface, and the radial diameter of base is greater than the radial diameter of insertion tube; Sleeve is provided with sleeve through hole and runs through base and insertion tube, and sleeve is enclosed within ratchet shaft by sleeve through hole; Base bottom surface arranges detent recess, and detent recess is positioned at insertion tube side, arranges pawl axis in detent recess, and pawl axis is provided with the ratchet matched with the ratchet gear teeth; Insertion tube side arranges sleeve key.

Improve as another kind of the present invention, Automatic compasses module comprises reducing motor, train of reduction gears, the first power supply: train of reduction gears comprises the first gear, the second gear, the 3rd gear, the 4th gear, the 5th gear; Described first gear is meshed with the second gear, and the second gear and the 3rd gear are in-line gears, and the 3rd gear is meshed with the 4th gear, and the 4th gear is meshed with the 5th gear, and the 5th gear is meshed with the gear teeth of travelling gear; Gear in reducing motor is meshed with the first gear; First power supply is connected with reducing motor and is provided with switch.

Improve as another kind of the present invention, the upper bottom surface of compass foot is provided with boss, telescopic shaft through hole is positioned at the upper surface of boss, the insertion tube chamber that telescopic shaft through hole is divided into internal diameter identical with insertion tube external diameter and internal diameter are greater than the flexible axocoel of insertion tube external diameter, the step wall that insertion tube chamber connects with flexible axocoel arranges a pair with the telescopic shaft through hole center of circle for symmetric points arrange the first screwed hole, the line in this double thread hole is vertical with sliding tray, arranges the first Time-optimum Controller in the first screwed hole; The upper surface of boss arranges the sleeve keyway matched with sleeve key, and sleeve keyway is connected with telescopic shaft through hole; In use, sleeve keyway and sleeve key interference fit; Compass foot bottom surface arranges the T-shaped sliding tray distally extended for starting point with telescopic shaft through hole, T-shaped sliding tray sidewall is carved with the scale of measuring distance, arranges chalk slide block in T-shaped sliding tray; Chalk slide block comprise top cover, T-shaped piece, stage clip, chalk sleeve, locator; T-shaped piece with the mating shapes of sliding tray, and be provided with chalk sleeve through hole; Top cover, the upper bottom surface larger with T-shaped piece of area is connected and covers on chalk sleeve through hole; Stage clip is positioned at chalk sleeve through hole, and one end contacts with top cover; Chalk sleeve, upper bottom surface stretches into chalk sleeve through hole and contacts with the stage clip other end, and bottom surface is provided with chalk groove; Locator is arranged on T-shaped piece of side, is against in use on the inwall of sliding tray.Telescopic shaft, comprises pedestal and is arranged at the cylindrical telescopic shaft sleeve of pedestal upper bottom surface; The upper bottom surface of pedestal is arranged a pair and the second screwed hole that the first screwed hole matches, arrange the second Time-optimum Controller in the second screwed hole, the second Time-optimum Controller is connected with the first Time-optimum Controller by spring.

Compared with prior art, its advantage is the utility model: (1) blade takes two ends formula design, and volume is little, is easy to carry; (2) blade upper set measuring distance, take measurement of an angle, draw the functions such as circle, teacher's pointer; (3) compass foot matches with motor, ratchet, gear and automatically can draw the circle of different-diameter.

The multifunction teaching folding ruler that the utility model provides is specifically described below in conjunction with accompanying drawing.

Accompanying drawing explanation

Fig. 1 is perspective view of the present utility model;

Fig. 2 is upward view of the present utility model;

Fig. 3 is high-level schematic functional block diagram of the present utility model;

Fig. 4 is compass foot structural representation;

Fig. 5 is axle cap structure schematic diagram;

Fig. 6 is rotary sleeve structural representation;

Fig. 7 is travelling gear structural representation;

Fig. 8 is tube-in-tube structure schematic diagram;

Fig. 9 is the combining structure schematic diagram of travelling gear and sleeve;

Figure 10 is train of reduction gears structural representation;

Figure 11 is cap structure schematic diagram;

Figure 12 is the combining structure schematic diagram of T-shaped piece and locator;

Figure 13 is chalk sleeve structural representation;

Figure 14 is telescopic shaft structural representation;

Figure 15 is measuring angle scale plate schematic diagram;

Figure 16 is measuring angle scale plate scale value algorithm schematic diagram.

Detailed description of the invention

Composition graphs 1, a kind of rotating shaft 3 and rotating shaft 8 comprising chi 1 and lower chi 2 in chi 1, lower chi 2, connection;

Upper chi 1 one end is provided with rotating shaft through hole; Composition graphs 3, upper chi 1 bottom surface arranges the first groove, arranges Laser Measuring hornwork 4, PPT page turner 5, laser pointer 6 and Automatic compasses module 7 in the first groove; Lower chi 2 one end is provided with rotating shaft through hole, and lower chi 2 arranges folding rack 11 away from the bottom surface of one end of rotary shaft hole; Rotating shaft 3 inserts rotating shaft through hole and connects upper chi 1 and lower chi 2, and lower chi 2 rotates centered by rotating shaft 3.Upper chi 1 bottom surface is provided with projection along the long limit of one bar and lower chi 2 upper bottom surface along a long limit, and projection is provided with the scale of measuring distance, and lower chi 2 is centered by rotating shaft after rotary expansion, and the scale of upper chi 1 and lower chi 2 point-blank and scale sequence arrangement.

Composition graphs 4 to Fig. 9, rotating shaft 3 comprises axle top cover 3-1, rotary sleeve 3-2, travelling gear 3-3, sleeve 3-4:

Axle top cover 3-1, its bottom surface is provided with the second groove, and the second groove inner wall is provided with screw thread;

Rotary sleeve 3-2 is cylinder, its radial diameter is identical with rotating shaft through-hole diameter, its upper bottom surface diameter is less than axle top cover 3-1 bottom surface diameter, and upper bottom surface is provided with columniform first protruding 3-23, and the first protruding 3-23 sidewall is provided with the screw thread with the second groove match; Bottom surface is provided with the 3rd groove 3-21, and the center of the 3rd groove 3-21 bottom surface arranges ratchet shaft 3-22, and ratchet shaft 3-22 is arranged perpendicular to the upper bottom surface of rotary sleeve 3-2; Rotary sleeve 3-2 sidewall is provided with the window 3-22 of the second groove; The protruding 3-24 of annular is set along bottom surface edge;

Travelling gear 3-3, travelling gear 3-3 excircle is provided with gear teeth 3-31, bottom surface is provided with ratchet recesses 3-32, the inwall of ratchet recesses 3-32 is provided with ratchet gear teeth 3-33, travelling gear 3-3 upper bottom surface center is provided with the first ratchet shaft through hole 3-34, and travelling gear 3-3 is enclosed within ratchet shaft 3-22 by the first ratchet shaft through hole 3-34;

Sleeve 3-4, comprises in cylindrical base 3-41, the cylindrical insertion tube 3-42 being arranged on base 3-41 bottom surface, and the radial diameter of base 3-41 is greater than the radial diameter of insertion tube 3-42; Sleeve 3-4 is provided with sleeve through hole 3-44 and runs through base 3-41 and insertion tube 3-42, and sleeve 3-4 is enclosed within ratchet shaft 3-22 by sleeve through hole 3-44; Base 3-41 bottom surface arranges detent recess 3-45, and detent recess 3-45 is positioned at insertion tube 3-42 side, arranges pawl axis in detent recess 3-45, and pawl axis is provided with the ratchet 3-46 matched with ratchet gear teeth 3-33; Insertion tube 3-42 side arranges sleeve key 3-43.

The diameter of the afterbody of ratchet shaft 3-22 is greater than the internal diameter of the first ratchet shaft through hole 3-34 and sleeve through hole 3-44, is adding man-hour, and the head of ratchet shaft 3-22 is fixedly connected on rotary sleeve 3-2 through after sleeve through hole 3-44 and the first ratchet shaft through hole 3-34 successively.

The upper bottom surface of composition graphs 3 compass foot 8 is provided with boss 8-1, telescopic shaft through hole 8-2 is positioned at the upper surface of boss 8-1, the insertion tube chamber 8-21 that telescopic shaft through hole 8-2 is divided into internal diameter identical with insertion tube 3-42 external diameter and internal diameter are greater than the flexible axocoel 8-22 of insertion tube 3-42 external diameter, the step wall that insertion tube chamber 8-21 connects with flexible axocoel 8-22 arranges a pair with the telescopic shaft through hole 8-2 center of circle for symmetric points arrange the first screwed hole 8-4, the 8-4 line in this double thread hole is vertical with sliding tray 8-3, arranges the first Time-optimum Controller in the first screwed hole 8-4; The upper surface of boss 8-1 arranges the sleeve keyway 8-11 matched with sleeve key 3-43, and sleeve keyway 8-11 is connected with telescopic shaft through hole 8-2; In use, sleeve keyway 8-11 and sleeve key 3-43 interference fit;

Composition graphs 3, compass foot 8 bottom surface arranges the T-shaped sliding tray 8-3 distally extended for starting point with telescopic shaft through hole 8-2, T-shaped sliding tray 8-3 sidewall is carved with the scale of measuring distance, arranges chalk slide block 10 in T-shaped sliding tray 8-3;

In conjunction with Figure 11 to Figure 13, chalk slide block 10 comprises top cover 10-1, T-shaped piece of 10-2, stage clip, chalk sleeve 10-4, locator; The mating shapes of T-shaped piece of 10-2 and sliding tray 8-1, and be provided with chalk sleeve through hole 10-21; Top cover 10-1 between T-shaped sliding tray 8-1 with T-shaped piece of 10-2 and the upper bottom surface larger with T-shaped piece of 10-2 area be connected and cover on chalk sleeve through hole 10-21, top cover 10-1 is cylinder, arranges in the bilateral symmetry of cylindrical sidewall the jockey 10-11 be connected with T-shaped piece of 10-2; Stage clip, be positioned at chalk sleeve through hole 10-21, one end contacts with top cover 10-1; Chalk sleeve 10-4, upper bottom surface stretches into chalk sleeve through hole and contacts with the stage clip other end, and bottom surface is provided with chalk groove 10-41; Locator is arranged on T-shaped piece of 10-2 side, is against on the inwall of sliding tray 8-1 in use; Described locator comprises screw and screw slot 10-22; Screw slot 10-22 is connected on the sidewall of T-shaped piece of 9-2, and its axial direction along chalk sleeve through hole 10-21 arranges screwing through hole 10-23, and screw screws in screwing through hole 10-23.

In conjunction with Figure 14, telescopic shaft 9, comprises pedestal 9-1 and is arranged at pedestal 9-1 upper bottom surface cylindrical telescopic shaft sleeve 9-2; The upper bottom surface of pedestal 9-1 is arranged a pair and the second screwed hole 9-3 that the first screwed hole 8-4 matches, arrange the second Time-optimum Controller in the second screwed hole 9-3, the second Time-optimum Controller is connected with the first Time-optimum Controller by spring.

The present invention is integrated with Laser Measuring hornwork 4, PPT page turner 5, laser pointer 6 and Automatic compasses module 7 and can completes measuring distance, take measurement of an angle, from functions such as animation circle, teacher's pointer, PPT page turnings in the groove of upper chi 1.

Laser Measuring hornwork 4 comprises generating laser 4-1, second source 4-2; There is the inclination angle of β on the long limit of the laser that generating laser 4-1 launches and upper chi 1; Second source 4-2 connects generating laser 4-1; Along side, long limit arranges the second protruding 2-1 receiving the laser that Laser Measuring hornwork 4 is launched to lower chi 2 upper bottom surface, and the second protruding 2-1 arranges measuring angle scale plate as shown in figure 15, and in conjunction with Figure 16, the account form that scale portrays position is:

From sine: $\frac{m}{\sin \mathrm{\α}}=\frac{l}{\sin \mathrm{\β}};$

From the cosine law: $\cos \mathrm{\α}=\frac{l^2+n^2-m^2}{2l\×n};$

Arrangement obtains $\mathrm{\α}={\cos }^{-1}\frac{2n{\sin \mathrm{\β}}^2+\sqrt{(2\mathrm{nl}\sin {\mathrm{\β}}^2-4l^2[(l^2+n^2)\sin {\mathrm{\β}}^2-l^2\left]\right)}}{{2l}^2};$

Wherein l is that generating laser 4-1 is mapped to the distance of the luminous point on the second protruding 2-1 to rotating shaft 3 center; M is the distance of generating laser 4-1 to the second protruding 2-1; N is the distance of generating laser 4-1 to rotating shaft 3 center; According to the size of the α that l and constant n can ask, then l corresponding for each α is made a mark on the second protruding 2-1.

PPT page turner 5 is RF RF remote, comprises RF radiofrequency launcher and function button, and its receiving terminal is connected in USB interface; During work, receiving terminal being inserted in the USB interface of host computer, can normally work without the need to installing driving.The correlation function key that user only need click RF RF remote just can handle receiving terminal, thus realizes the function such as advance, retrogressing of PPT displaying page on computer.

Laser pointer 6 is laser pen.

Automatic compasses module 7 comprises reducing motor 7-1, the first power supply 7-2, train of reduction gears 7-3:

Train of reduction gears 7-3 comprises the first gear 7-31, the second gear 7-32, the 3rd gear 7-33, the 4th gear 7-34, the 5th gear 7-35, described first gear 7-31 is meshed with the second gear 7-32, second gear 7-32 and the 3rd gear 7-33 is in-line gears, 3rd gear 7-33 is meshed with the 4th gear 7-34,4th gear 7-34 is meshed with the 5th gear 7-35, and the 5th gear 7-35 is meshed with the gear teeth 3-311 of travelling gear 3-31; Gear in reducing motor 7-1 is meshed with the first gear 7-31; First power supply 7-2 is connected with reducing motor 7-1 and is provided with switch.

The diameter 5.1mm of described first gear 7-31, modulus 0.3, the number of teeth 17; The diameter 25.5mm of the second gear 7-32, modulus 0.3, the number of teeth 85, rotates to ensure to coordinate with the first gear 7-31, and gearratio is as far as possible close to 5; The diameter 15mm of the 3rd gear 7-33, modulus 0.5, the number of teeth 30; The diameter 15mm of the 4th gear 7-34, modulus 0.5, the number of teeth 30; The diameter 30mm of the 5th gear 7-35, modulus 0.5, the number of teeth 60.

In use, the folding rack 11 on lower chi 2 opens the effect playing support.Chalk is inserted in chalk sleeve 10-4, and T-shaped piece of 10-2 slides in T-shaped sliding tray 8-1, and determined the radius of circumference by the scale be labeled on T-shaped sliding tray 8-1 limit, T-shaped piece of 10-2 is fixed by screw 10-5.Compass foot 8 inserts telescopic shaft through hole by telescopic shaft 9 and is connected with rotating shaft 3, drives train of reduction gears 7-3 rotate thus rotating shaft 3 is rotated by the first power supply 7-2, and then drives compass foot 8 to rotate, and completes the work of picture circle.First power supply 7-2 is that 4 pieces of 3 volts of button cells are powered, and motor internal carries worm and gear, realizes tentatively slowing down, then carries out double reduction by train of reduction gears 7-3, finally exports and reaches desirable speed.There is a handle ratchet wheel rotating shaft 3 inside, and compasses arm can be made with arbitrarily angled initial rotation.The compass foot that can make to be equipped with bottom ruler chalk by slowing down rotates with the angular speed of π rad/s, namely within 2 seconds, can draw out a complete circle.

The long 285mm of chi 1 in the present invention, the long 240mm of lower chi 2; The beam overall of folded state is 70mm; Expansion overall length is 545mm, and beam overall is 60mm, and height overall is 16mm.

Claims (9)

1. a multifunctional teaching ruler, is characterized in that, comprises rotating shaft [3] and the compass foot [8] of chi [1] and lower chi [2] in chi [1], lower chi [2], connection:

Upper chi [1] long limit is provided with scale, upper chi [1] one end is provided with rotating shaft through hole, upper chi [1] bottom surface arranges the first groove, arranges Laser Measuring hornwork [4], PPT page turner [5], laser pointer [6] and Automatic compasses module [7] in the first groove;

The long limit of lower chi [2] is provided with scale, and lower chi [2] one end is provided with rotating shaft through hole;

Rotating shaft [3] inserts rotating shaft through hole and connects upper chi [1] and lower chi [2], and lower chi [2] rotates centered by rotating shaft [3];

Compass foot [8] is in chi shape, one end is provided with telescopic shaft through hole [8-2], telescopic shaft [9] inserts telescopic shaft through hole [8-2] and is connected with compass foot [8], compass foot [8] bottom surface arranges the sliding tray [8-3] distally extended for starting point with telescopic shaft through hole [8-2], arranges chalk slide block [10] in sliding tray [8-3]; In use, compass foot [8] is connected on rotating shaft [3], compass foot [8] with rotating shaft [3] for axle rotate.

2. multifunctional teaching ruler according to claim 1, is characterized in that, rotating shaft [3] comprises axle top cover [3-1], rotary sleeve [3-2], travelling gear [3-3], sleeve [3-4]:

Axle top cover [3-1], its bottom surface is provided with the second groove [3-11], and the second groove [3-11] inwall is provided with internal thread;

Rotary sleeve [3-2], in cylinder, its radial diameter is identical with rotating shaft through-hole diameter, its upper bottom surface diameter is less than axle top cover [3-1] bottom surface diameter, upper bottom surface is provided with columniform first projection [3-23], and the first projection [3-23] sidewall is provided with the external screw thread matched with the second groove inner wall internal thread; Bottom surface is provided with the 3rd groove [3-21], and the center of the 3rd groove [3-21] bottom surface arranges ratchet shaft [3-22], and ratchet shaft [3-22] is arranged perpendicular to the upper bottom surface of rotary sleeve [3-2]; Rotary sleeve [3-2] sidewall is provided with the window [3-25] of the second groove; The projection [3-24] of annular is set along bottom surface edge;

Travelling gear [3-3], travelling gear [3-3] excircle is provided with the gear teeth [3-31], bottom surface is provided with ratchet recesses [3-32], the inwall of ratchet recesses [3-32] is provided with the ratchet gear teeth [3-33], travelling gear [3-3] upper bottom surface center is provided with the first ratchet shaft through hole [3-34], and travelling gear [3-3] is enclosed within ratchet shaft [3-22] by the first ratchet shaft through hole [3-34];

Sleeve [3-4], comprise in cylindrical base [3-41], be arranged on the cylindrical insertion tube [3-42] of base [3-41] bottom surface, the radial diameter of base [3-41] is greater than the radial diameter of insertion tube [3-42]; Sleeve [3-4] is provided with sleeve through hole [3-44] and runs through base [3-41] and insertion tube [3-42], and sleeve [3-4] is enclosed within ratchet shaft [3-22] by sleeve through hole [3-44]; Base [3-41] bottom surface arranges detent recess [3-45], detent recess [3-45] is positioned at insertion tube [3-42] side, arrange pawl axis [3-47] in detent recess [3-45], pawl axis is provided with the ratchet [3-46] matched with the ratchet gear teeth [3-33]; Insertion tube [3-42] side arranges sleeve key [3-43].

3. multifunctional teaching ruler according to claim 1, is characterized in that, Automatic compasses module [7] comprises reducing motor [7-1], the first power supply [7-2], train of reduction gears [7-3]:

Train of reduction gears [7-3] comprises the first gear [7-31], the second gear [7-32], the 3rd gear [7-33], the 4th gear [7-34], the 5th gear [7-35]; Described first gear [7-31] is meshed with the second gear [7-32], second gear [7-32] and the 3rd gear [7-33] are in-line gears, 3rd gear [7-33] is meshed with the 4th gear [7-34], 4th gear [7-34] is meshed with the 5th gear [7-35], and the 5th gear [7-35] is meshed with the gear teeth [3-31] of travelling gear [3-3];

Gear in reducing motor [7-1] is meshed with the first gear [7-31];

First power supply [7-2] is connected with reducing motor [7-1] and is provided with switch.

4. multifunctional teaching ruler according to claim 1, is characterized in that,

The upper bottom surface of compass foot [8] is provided with boss [8-1], telescopic shaft through hole [8-2] is positioned at the upper surface of boss [8-1], the insertion tube chamber [8-21] that telescopic shaft through hole [8-2] is divided into internal diameter identical with insertion tube [3-42] external diameter and internal diameter are greater than the flexible axocoel [8-22] of insertion tube [3-42] external diameter, the step wall that insertion tube chamber [8-21] connects with flexible axocoel [8-22] arranging a pair with telescopic shaft through hole [8-2] center of circle is that symmetric points arrange the first screwed hole [8-4], [8-4] line in this double thread hole is vertical with sliding tray [8-3], in first screwed hole [8-4], the first Time-optimum Controller is set, the upper surface of boss [8-1] arranges the sleeve keyway [8-11] matched with sleeve key [3-43], and sleeve keyway [8-11] is connected with telescopic shaft through hole [8-2], in use, sleeve keyway [8-11] and sleeve key [3-43] interference fit,

The sliding tray [8-3] of the bottom surface of compass foot [8] is T-shaped, and its sidewall is carved with scale;

Chalk slide block [10] comprises top cover [10-1], T-shaped piece [10-2], stage clip, chalk sleeve [10-4], locator; The mating shapes of T-shaped piece [10-2] and sliding tray [8-3], and be provided with chalk sleeve through hole [10-21]; Top cover [10-1], the upper bottom surface larger with T-shaped piece of [10-2] area is connected and covers on chalk sleeve through hole; Stage clip, is positioned at chalk sleeve through hole, and one end contacts with top cover [10-1]; Chalk sleeve [10-4], upper bottom surface stretches into chalk sleeve through hole and contacts with the stage clip other end, and bottom surface is provided with chalk groove [10-41]; Locator is arranged on T-shaped piece of [10-2] side, is against on the inwall of sliding tray [8-1] in use;

Telescopic shaft [9], comprises pedestal [9-1] and is arranged at the cylindrical telescopic shaft sleeve [9-2] of pedestal [9-1] upper bottom surface; The upper bottom surface of pedestal [9-1] is arranged a pair and the second screwed hole [9-3] that the first screwed hole [8-4] matches, arrange the second Time-optimum Controller in second screwed hole [9-3], the second Time-optimum Controller is connected with the first Time-optimum Controller by spring.

5. multifunctional teaching ruler according to claim 4, is characterized in that, locator comprises screw screw slot [10-22];

Screw slot [10-22] is connected on the sidewall of T-shaped piece [10-2], and its axial direction along chalk sleeve through hole [9-21] arranges screwing through hole [10-23], and screw [10-5] screws in screwing through hole [10-23].

6. multifunctional teaching ruler according to claim 1, is characterized in that, Laser Measuring hornwork [4] comprises generating laser [4-1], second source [4-2]:

Generating laser [4-1], there is the inclination angle of β on the long limit of its laser launched and upper chi [1];

Second source [4-2], it connects generating laser [4-1];

Along side, long limit arranges the second projection [2-1] receiving the laser that generating laser [4] is launched to described lower chi [2] upper bottom surface, and the second projection [2-1] arranges measuring angle scale plate.

7. multifunctional teaching ruler according to claim 1, is characterized in that, PPT page turner [5] is RF RF remote, comprises RF radiofrequency launcher and function button, and its receiving terminal is connected in computer USB interface.

8. multifunctional teaching ruler according to claim 1, is characterized in that, laser pointer [6] is laser pen.

9. multifunctional teaching ruler according to claim 1, is characterized in that, lower chi [2] arranges folding rack [11] away from the bottom surface of one end of rotating shaft [3].