CN209756568U

CN209756568U - Tool for mathematical drawing

Info

Publication number: CN209756568U
Application number: CN201920160552.7U
Authority: CN
Inventors: 唐风军; 孙惠憬; 唐延茹
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2019-12-10
Anticipated expiration: 2029-01-24

Abstract

The utility model discloses an instrument is used in mathematical drawing, including fixed case, dead lever, U template and landing leg, the top center department of fixed case has the dead lever along vertical direction sliding connection, and the top of dead lever welds with the preceding inner wall center department of U template mutually, and the dead lever is located to articulate on the inside one end rear wall of U template has the landing leg, and the top center department of fixed case has seted up the slide opening, and fixed case passes through slide opening and dead lever sliding connection. The utility model discloses in, at first, need not the hard removal of user and support the centre of a circle pole, the position of centre of a circle point also can be fixed, when using, can laborsaving drawing a complete circle, and it is fixed to use the sucking disc, can not cause the harm to the blackboard, secondly, be provided with the ruler of measurable distance between chalk and the centre of a circle pole, it is convenient to use, and the diameter distance of circle is observed more directly perceived, and finally, it is provided with the splint that can adjust by oneself in the pen socket of chalk end to place, be applicable to the chalk of different diameters, the variability is strong.

Description

Tool for mathematical drawing

Technical Field

The utility model relates to a mathematics teaching aid technical field especially relates to an instrument is used in mathematical drawing.

Background

The compasses are usually made of metal or wood materials and comprise two parts which are connected by a hinge, wherein the two parts can be adjusted, and chalk can be loaded on a movable supporting rod for drawing.

In the operation process, because the hand that is pressing the compasses also rotates along with the compasses, the central point is the off tracking very easily, can not draw an accurate circle, and the compasses bottom that can fix on the blackboard is equipped with the syringe needle, need insert the syringe needle and fix on the blackboard, not only fixed effect is not good, and can be to blackboard or artificial injury, if the size of the circle of drawing of needs adjustment, then use the ruler to measure the distance earlier, reuse the compasses to draw the circle, generally all need multiple operation, the time that consumes, the step is loaded down with trivial details, can lead to teaching inefficiency, and fall and break in order to prevent when the chalk from dropping in parallel with ground, all make the chalk one end big little, and the chalk cover size on the compasses is fixed, can't fix the less nib of diameter, the variability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a mathematical drawing tool.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a tool for mathematical drawing comprises a fixed box, a fixed rod, a U-shaped plate and supporting legs, wherein the center of the top of the fixed box is connected with the fixed rod in a sliding manner along the vertical direction, the top end of the fixed rod is welded with the center of the front inner wall of the U-shaped plate, the fixed rod is hinged with the supporting legs on the rear wall of one end inside the U-shaped plate, the center of the top of the fixed box is provided with a slide hole, the fixed box is connected with the fixed rod in a sliding manner through the slide hole, one end of the fixed rod penetrating into the fixed box is connected with a slide plate in a rotating manner through a bearing, the slide plate is connected with the fixed box in a sliding manner along the vertical direction, the center of the bottom of the fixed box is provided with a vent hole, the bottom of the fixed box is bonded with a sucker, the bottom of the supporting legs is connected with a clamping plate in a, the ruler is provided with a strip-shaped sliding groove along the length direction, a T-shaped sliding block is vertically welded to the top end of the front surface wall of the pen cap, the T-shaped sliding block is located in the strip-shaped sliding groove, the pen cap is connected with the ruler in a sliding mode through the T-shaped sliding block, a bidirectional threaded rod is arranged on the inner level of the pen cap, a threaded sleeve is sleeved on the bilateral symmetry sleeve of the bidirectional threaded rod, and the two threaded sleeve is provided with a sliding rod through the vertical welding of the bottom center of the threaded sleeve.

Preferably, the bidirectional threaded rod penetrates through one end of the pen cap, a push button is welded on the end, outside the pen cap, of the bidirectional threaded rod, and the other end of the bidirectional threaded rod is rotatably connected with the inner wall of the pen cap through a bearing.

Preferably, the limiting plate is welded in the position, located below the bidirectional threaded rod, of the pen cap, the limiting plate is provided with a limiting sliding groove, the limiting sliding groove is parallel to the bidirectional threaded rod, and the limiting sliding groove is in sliding connection with the two sliding rods.

Preferably, the bottom of the slide bar is welded with arc-shaped clamping plates, and the opposite surfaces of the arc-shaped clamping plates are bonded with rubber pads.

Preferably, a handle is vertically welded at the center of the top of the U-shaped plate, and chalk is clamped in the pen sleeve through the two arc-shaped clamping plates.

Preferably, the T-shaped sliding block penetrates through the center of the top of one end outside the ruler and is vertically welded with an index, and the front view structure of the index is triangular.

Preferably, return springs are symmetrically welded to two sides of the bottom of the sliding plate, and the bottoms of the return springs are welded to the fixed box.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: firstly, can fix the centre of a circle pole of compasses on the blackboard, need not the hard going of user and support the centre of a circle pole, the position of centre of a circle point also can be fixed, when using, can laborsaving drawing a complete circle, and it is fixed to use the sucking disc, can not cause the harm to the blackboard, secondly, be provided with the ruler of measurable distance between chalk and the centre of a circle pole, it is convenient to use, and the diameter distance of circle is more directly perceived of observing, save time, finally, it is provided with the splint that can adjust by oneself in the pen socket of placing chalk end, be applicable to the chalk of different diameters, the variability is strong.

Drawings

Fig. 1 is a schematic front cross-sectional structural view of a mathematical drawing tool according to the present invention;

Fig. 2 is a schematic front view of an internal structure of a pen cap of a mathematical drawing tool according to the present invention;

fig. 3 is a schematic view of the internal structure of the pen cap of the mathematical drawing tool according to the present invention.

In the figure: 1. a fixed box; 2. a slide plate; 3. a slide hole; 4. a straightedge; 5. fixing the rod; 6. a handle; 7. a U-shaped plate; 8. a support leg; 9. a clamping plate; 10. indexes; 11. a T-shaped slider; 12. a strip-shaped chute; 13. a pen cap; 14. chalk; 15. a suction cup; 16. a return spring; 17. a vent hole; 18. a limiting plate; 19. a bidirectional threaded rod; 20. a push button; 21. a threaded sleeve; 22. a slide bar; 23. an arc-shaped splint; 24. a limiting chute; 25. and (7) a rubber pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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. 1-3, the present invention provides an embodiment: a tool for mathematical drawing comprises a fixed box 1, a fixed rod 5, a U-shaped plate 7 and supporting legs 8, wherein the center of the top of the fixed box 1 is connected with the fixed rod 5 in a sliding manner along the vertical direction, the top end of the fixed rod 5 is welded with the center of the front inner wall of the U-shaped plate 7, the supporting legs 8 are hinged on the rear wall of one end of the fixed rod 5 positioned in the U-shaped plate 7, the center of the top of the fixed box 1 is provided with a slide hole 3, the fixed box 1 is connected with the fixed rod 5 in a sliding manner through the slide hole 3, the diameter of the slide hole 3 is larger than that of the fixed rod 5, one end of the fixed rod 5 penetrating into the fixed box 1 is rotatably connected with a slide plate 2 through a bearing, the slide plate 2 is connected with the fixed box 1 in a sliding manner along the vertical direction, the center of the bottom of the fixed box 1 is provided with a vent hole 17, the bottom of the fixed box, the pen cap 13 is of a cylindrical structure provided with a groove, the opening of the pen cap is downward, an anti-abrasion pad is arranged on the inner wall of the clamping plate 9 to prevent the clamping plate 9 from being abraded due to long-time rotation of the supporting leg 8, a straight ruler 4 is horizontally welded on the front surface wall of the fixed rod 5 close to the bottom end of the fixed rod, scales on the straight ruler 4 are marked from the vertical central line of the fixed rod 5, a strip-shaped chute 12 is formed in the straight ruler 4 along the length direction, a T-shaped sliding block 11 is vertically welded at the top end of the front surface wall of the pen cap 13, the T-shaped sliding block 11 is positioned in the strip-shaped chute 12, the wider side of the T-shaped sliding block 11 is positioned outside the strip-shaped chute 12, so that the pen cap 13 is connected with the straight ruler 4, the pen cap 13 cannot be disconnected with the straight ruler 4 in the moving process, the pen cap 13 is in sliding connection with the straight ruler 4 through the, and the center of the bottom of each of the two thread sleeves 21 is vertically welded with a sliding rod 22.

Furthermore, one end of the bidirectional threaded rod 19 penetrating out of the pen cap 13 is welded with a push button 20, the push button 20 is sleeved with an anti-slip sleeve, so that the push button 20 is prevented from being operated inconveniently due to hand slip when being screwed, and the other end of the bidirectional threaded rod 19 is rotatably connected with the inner wall of the pen cap 13 through a bearing.

Furthermore, a limiting plate 18 is welded in the interior of the pen cap 13 and located below the bidirectional threaded rod 19, a limiting sliding groove 24 is formed in the limiting plate 18, the limiting sliding groove 24 is parallel to the bidirectional threaded rod 19, the limiting sliding groove 24 is connected with the two sliding rods 22 in a sliding mode, and the limiting plate 18 can prevent dust generated when the chalk 14 is used from flying to the bidirectional threaded rod 19.

Further, arc-shaped clamping plates 23 are welded at the bottoms of the two sliding rods 22, rubber pads 25 are bonded on opposite surfaces of the two arc-shaped clamping plates 23, and the rubber pads 25 can reduce friction of the arc-shaped clamping plates 23 on the chalk 14.

Further, the handle 6 is vertically welded at the center of the top of the U-shaped plate 7, a chalk 14 is clamped in the pen cap 13 through two arc-shaped clamping plates 23, the arc-shaped clamping plates 23 are made of elastic plastics, and the outer wall of the chalk 14 can be attached to the greatest extent.

Further, index 10 is vertically welded at the center of the top of one end, which penetrates through the straight scale 4, of the T-shaped sliding block 11, the front view structure of the index 10 is triangular, and the tip of the index 10 points to the scale marked on the straight scale 4.

Furthermore, return springs 16 are symmetrically welded on two sides of the bottom of the sliding plate 2, and the bottoms of the two return springs 16 are welded with the fixed box 1.

the working principle is as follows: when the chalk holder is used, firstly, the chalk 14 is inserted into the chalk holder 13, the chalk 14 is positioned between the two arc-shaped clamping plates 23, then the push button 20 is screwed in one direction, the two-way threaded rod 19 rotates, the two threaded sleeves 21 move towards the middle to drive the two arc-shaped clamping plates 23 to move in the same direction until the two arc-shaped clamping plates 23 can clamp the chalk 14, if the distance between the two arc-shaped clamping plates 23 needs to be increased, the push button 20 is screwed in the opposite direction, after the chalk 14 is fixed, the fixing box 1 is held firstly, the fixing rod 5 is pressed downwards, then the sucker 15 is aligned to a certain position on a blackboard, the force applied to the fixing rod 5 is released, the return spring 16 can upwards flick the sliding plate 2, the fixing rod 5 flicks upwards, when the sliding plate 2 flicks upwards, the air in the sucker 15 is sucked on the blackboard, then the chalk holder 13 is slid, the number pointed by the index 10 is observed, and when the index 10 slides to the designated number, the handle 6 is held to rotate the supporting legs 8, a circle can be drawn, if the connection between the sucker 15 and the blackboard needs to be released, the fixing rod 5 is pressed downwards, the air in the fixing box 1 is extruded into the sucker 15 through the vent hole 17 by the sliding plate 2, the sucker 15 does not generate suction any more, and then the connection with the blackboard can be released.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a tool for mathematical drawing, includes fixed case (1), dead lever (5), U template (7) and landing leg (8), its characterized in that: the top center of the fixed box (1) is connected with a fixed rod (5) in a sliding manner along the vertical direction, the top end of the fixed rod (5) is welded with the center of the front inner wall of the U-shaped plate (7), the fixed rod (5) is positioned on the rear wall of one end inside the U-shaped plate (7) and is hinged with a supporting leg (8), the top center of the fixed box (1) is provided with a sliding hole (3), the fixed box (1) is connected with the fixed rod (5) in a sliding manner through the sliding hole (3), one end of the fixed rod (5) penetrating through the fixed box (1) is rotatably connected with a sliding plate (2) through a bearing, the sliding plate (2) is connected with the fixed box (1) in a sliding manner along the vertical direction, the bottom center of the fixed box (1) is provided with a ventilation hole (17), the bottom of the fixed box (1) is bonded with a sucker (15), the bottom of the supporting, the bottom of landing leg (8) is rotated through grip block (9) and is connected with pen socket (13), be close to bottom department horizontal welding on the preceding table wall of dead lever (5) and have ruler (4), bar spout (12) have been seted up along length direction on ruler (4), the perpendicular welding in preceding table wall top of pen socket (13) has T type slider (11), and T type slider (11) are located bar spout (12), pen socket (13) are through T type slider (11) and ruler (4) sliding connection, the inside level of pen socket (13) is provided with two-way threaded rod (19), the bilateral symmetry cover of two-way threaded rod (19) is equipped with thread bush (21), and two the equal vertical welding of bottom center department of thread bush (21) has slide bar (22).

2. A mathematical drawing tool as defined in claim 1, wherein: the bidirectional threaded rod (19) penetrates through one end of the pen cap (13) and is welded with the push button (20), and the other end of the bidirectional threaded rod (19) is rotatably connected with the inner wall of the pen cap (13) through a bearing.

3. A mathematical drawing tool as defined in claim 1, wherein: the inside below that is located two-way threaded rod (19) of pen socket (13) welds limiting plate (18), limiting chute (24) have been seted up on limiting plate (18), and limiting chute (24) parallel with two-way threaded rod (19), and limiting chute (24) and two slide bar (22) sliding connection.

4. A mathematical drawing tool as defined in claim 1, wherein: arc-shaped clamping plates (23) are welded at the bottoms of the two sliding rods (22), and rubber pads (25) are bonded on opposite surfaces of the two arc-shaped clamping plates (23).

5. A mathematical drawing tool as defined in claim 4, wherein: the vertical welding of top center department of U template (7) has handle (6), through two in pen socket (13) arc splint (23) joint has chalk (14).

6. A mathematical drawing tool as defined in claim 1, wherein: t type slider (11) run through to ruler (4) outer vertical welding in one end top center department has index (10), the structure is triangle-shaped for the orthographic view of index (10).

7. A mathematical drawing tool as defined in claim 1, wherein: the bottom bilateral symmetry welding of slide (2) has reset spring (16), and two the bottom of reset spring (16) all welds with fixed case (1) mutually.