CN208774368U - It is a kind of to draw round mathematics set square - Google Patents

Abstract

The utility model discloses one kind can draw round mathematics set square, including set square ontology, the long side center of set square ontology is equipped with empty slot, clockwork spring is provided in empty slot, clockwork spring one end is connect by fixing bolt with set square, the clockwork spring other end connects draught line, empty slot top is equipped with slot cover, slot cover central part is equipped with towing pad, draught line is drawn from towing pad, chalk device is put in the connection of the draught line other end, the long side two sides of set square ontology are equipped with half round bar, the central point of half round bar is overlapped with towing pad, half round bar bottom edge is connect with the long side steel disc of set square ontology, the upper end of the half round bar of two sides is connected by coupling bar, the utility model solves the problems, such as that traditional compasses are difficult to circle of painting on three-dimensional surface, movable draught line can draw the circle for locating various diameters, solving half slot in traditional triangle ruler can only draw admittedly Surely round problem compares traditional triangle ruler, and the utility model is more practical, convenient.

Description

It is a kind of to draw round mathematics set square

Technical field

The utility model relates to math teaching aid fields, and in particular to one kind can draw round mathematics set square.

Background technique

Need to use many classroom instruction tools in teaching, the most common mathematical tool of set square is mainly used for making Geometrical pattern or measurement length and angle, during carrying out geometry teaching, it is often necessary to draw circle, and make on stereo black board Draw circle with a compass it is very inconvenient, and due to blackboard be hard, compasses supporting leg be easy slip so that draw circle it is lack of standardization.It is existing Set square in be equipped with half slot and be used to picture circle, but due to fixed when half slot so that used when imparting knowledge to students it is seldom, So many teachers are arbitrarily to draw circle using hand in field research, certain influence is brought to teaching.

Utility model content

The main purpose of the utility model is to provide one kind can draw round set square, including set square ontology, triangle Empty slot is arranged in long side center in ruler ontology, and the flexible of draught line, draught line are controlled by the clockwork spring being mounted in empty slot The chalk device of the other end, which can be used to realize on blackboard, to be write, and is come in the scale that the central point two sides of set square long side are equipped with The radius for controlling circle after determining radius, controls round radius using slide plate fixed traction line, thus required by drawing Circle effectively solves the problems in background technique

To achieve the above object, the technical solution that the utility model is taken are as follows:

A kind of to draw round set square, including set square ontology, the long side center of the set square ontology is equipped with empty slot, Clockwork spring is provided in empty slot, clockwork spring one end is connect by fixing bolt with set square, and the connection of the clockwork spring other end is led Lead, empty slot top are equipped with slot cover, and slot cover central part is equipped with towing pad, and draught line is drawn from towing pad, and the draught line other end connects It connects and puts chalk device, the long side two sides of set square ontology are equipped with half round bar, and the central point of half round bar is overlapped with towing pad, half round bar Bottom edge is connect with the long side steel disc of set square ontology, and steel disc is connect with half round bar and set square ontology steel nail, the half round bar of two sides Upper end connected by coupling bar, be hollow between two half round bars.

Preferably, putting chalk device includes: ledge for chalk on blackboard, chalk fixing bolt and support rod, and ledge for chalk on blackboard is cylindrical groove, chalk The top of slot is equipped with bolt hole, and chalk fixing bolt and bolt hole are corresponding.

Preferably, support rod is fixed on ledge for chalk on blackboard bottom end, and support rod connects draught line, when clockwork spring is shunk, support Bar blocks two semi-circular plates, so that ledge for chalk on blackboard is not fallen into inside semicircle device.

Preferably, it is equipped with scale on the inside of the long side of set square ontology, scale is successively stamped from half round bar central point to both sides.

Preferably, snap-gauge is equipped at towing pad, the snap-gauge is connect with slot cover by sliding slot, and snap-gauge is used to fixed traction Line, so that not extending when draught line is drawn to required length, the inside of slot cover is equipped with the sliding slot of indent in the two sides of snap-gauge, The vertical bar that snap-gauge two sides are equipped with evagination is corresponding with sliding slot.

Preferably, two semicircle rooved faces are carved with angle line, angle number are carved on each angle line side, in order to use Convenient to carve two angle numbers, two angle numbers are gradually increased in a reverse direction.

Preferably, set square body surface is equipped with anti-slip sucking disc, prevents set square from sliding in use process.

Working principle of the utility model is: a kind of can draw round set square, including set square ontology, triangular body The anti-slip sucking disc of surface setting can be fixed on when using set square and do not occur sliding on blackboard, set square ontology Empty slot is arranged in interior long side center, and the flexible of draught line, the draught line other end are controlled by the clockwork spring being mounted in empty slot Chalk device can be used to realize and write that two half round bars fix by steel disc and set square long side on blackboard, steel disc and Half round bar and set square long side are fixed by steel nail, so that half round bar is stablized, the central point and towing pad of half round bar are overlapped, So that the center of circle is fixed, round radius is measured in the scale that the central point two sides of set square long side are equipped with, after determining radius, is used Slide plate fixed traction line is to control round radius, to draw required circle.

The beneficial effect that the utility model generates is:

1, solve the problems, such as that traditional compasses are difficult to circle of painting on three-dimensional surface.

2, movable draught line can draw the circle for locating various diameters, and fixation can only be drawn by solving half slot in traditional triangle ruler Round problem, compares traditional triangle ruler, and the utility model is more practical.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model.

Fig. 2 is the chalk device sectional view of the utility model.

Fig. 3 is the empty slot plan view of the utility model.

Fig. 4 is the empty slot sectional view of the utility model.

Fig. 5 is the slot cover of the utility model and the connection schematic diagram of snap-gauge.

In figure: 1, set square ontology；2, steel disc；3, steel nail；4, half round bar；5, clockwork spring；6, fixing bolt；7, anti-skidding suction Disk；8, chalk device；81, ledge for chalk on blackboard；82, chalk fixing bolt；83, support rod；84, chalk；9, draught line；10, coupling bar； 11, slot cover；12, snap-gauge；13, empty slot；14, towing pad.

Specific embodiment

To be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, below In conjunction with specific embodiment, the utility model is further described.

As shown in Figs. 1-5, a kind of to draw round set square, including set square ontology 1, the long side of the set square ontology Center is equipped with empty slot 13, and clockwork spring 5 is provided in empty slot, and clockwork spring one end is connect by fixing bolt 6 with set square, clockwork spring The spring other end connects draught line 9, and empty slot top is equipped with slot cover 11, and slot cover is connect with empty slot hinge, and slot cover central part is equipped with and leads Pilot hole 14, draught line are drawn from towing pad, and the draught line other end connects chalk device 8, and the long side two sides of set square ontology are equipped with The central point of half round bar 4, half round bar is overlapped with towing pad, and half round bar bottom edge is connect with the long side of set square ontology by steel disc 2, Steel disc is connect with half round bar and set square ontology steel nail 3, and the upper end of the half round bar of two sides is connected by coupling bar 10, two semicircles It is hollow between item.

In the present embodiment, putting chalk device includes: ledge for chalk on blackboard 81, chalk fixing bolt 82 and support rod 83, and ledge for chalk on blackboard is circle Cylindrical groove, the top of ledge for chalk on blackboard are equipped with bolt hole, and chalk fixing bolt and bolt hole are corresponding, by rotation chalk fixing bolt come, Chalk 84 is squeezed by fixing bolt, to achieve the purpose that fixed chalk.

In the present embodiment, support rod is fixed on ledge for chalk on blackboard bottom end, and support rod connects draught line, when clockwork spring is shunk, Support rod blocks two half round bars, so that ledge for chalk on blackboard is not fallen into inside semicircle device, two half round bars are fixed by coupling bar, made It is formed between two half round bars hollow.

In the present embodiment, be equipped with scale on the inside of the long side of set square ontology, scale from half round bar central point to both sides successively Stamp is carved from central point to two sides, is drawing bowlder, and the radius of circle is determined by the number on scale.

In the present embodiment, snap-gauge 12 is equipped at towing pad, the snap-gauge is connect with slot cover by sliding slot, and snap-gauge is used to fix Draught line, so that not extending when draught line is drawn to required length, the inside of slot cover is equipped with the cunning of indent in the two sides of snap-gauge Slot, the vertical bar that snap-gauge two sides are equipped with evagination are corresponding with sliding slot.

In the present embodiment, two semicircle rooved faces are carved with angle line, are carved with angle number on each angle line side, in order to Easy to use to carve two angle numbers, two angle numbers are gradually increased in a reverse direction, are being drawn bowlder, are being passed through angle line and angle Degree determines round angle.

In the present embodiment, set square body surface is equipped with anti-slip sucking disc 7, prevents set square from sliding in use process.

When it is implemented, a kind of can draw round set square, including set square ontology, the surface setting of triangular body Anti-slip sucking disc can be fixed on when using set square and do not occur sliding on blackboard, long side center in set square ontology Empty slot is set, the flexible of draught line, the chalk device of the draught line other end are controlled by the clockwork spring being mounted in empty slot It can be used to realize on blackboard and write, two half round bars are fixed by steel disc and set square long side, steel disc and half round bar and three Angle square long side is fixed by steel nail, so that half round bar is stablized, the central point and towing pad of half round bar are overlapped, so that the center of circle is solid It is fixed, round radius is measured in the scale that the central point two sides of set square long side are equipped with, after determining radius, is led using slide plate fixation Lead is to control round radius, to draw required circle.

It is above that certain exemplary embodiments of the utility model are only described by way of explanation, undoubtedly, for Those skilled in the art can be with a variety of different without departing from the spirit and scope of the utility model Mode is modified described embodiment.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as Limitation to the utility model claims protection scope.

Claims (7)

1. one kind can draw round mathematics set square, including set square ontology, the long side center of the set square ontology is equipped with sky Slot is provided with clockwork spring in the empty slot, and described clockwork spring one end is connect by fixing bolt with set square, the clockwork spring bullet The spring other end connect draught line, the empty slot top be equipped with slot cover, the slot cover central part be equipped with towing pad, the draught line from The towing pad is drawn, and chalk device is put in the draught line other end connection, and the long side two sides of the set square ontology are equipped with half The central point of round bar, the half round bar is overlapped with towing pad, and the half round bar bottom edge is connect with the long side steel disc of set square ontology, The steel disc is connect with half round bar and set square ontology steel nail, and the upper end of the half round bar of two sides is connected by coupling bar, two institutes It is hollow for stating between half round bar.

2. one kind according to claim 1 can draw round mathematics set square, it is characterised in that: described to put chalk device packet Ledge for chalk on blackboard, chalk fixing bolt and support rod are included, the ledge for chalk on blackboard is cylindrical groove, and the top of the ledge for chalk on blackboard is equipped with bolt hole, The chalk fixing bolt and bolt hole are corresponding.

3. one kind according to claim 2 can draw round mathematics set square, it is characterised in that: the support rod upper surface It is connected to ledge for chalk on blackboard bottom end, the support rod lower surface connects draught line.

4. one kind according to claim 1 can draw round mathematics set square, it is characterised in that: the set square ontology Scale is equipped on the inside of long side, scale is successively stamped from half round bar central point to both sides.

5. one kind according to claim 1 can draw round mathematics set square, it is characterised in that: be equipped at the towing pad Snap-gauge, the snap-gauge are connect with slot cover by sliding slot.

6. one kind according to claim 1 can draw round mathematics set square, it is characterised in that: two half round bar tables It is carved with angle line in face.

7. one kind according to claim 1 can draw round mathematics set square, it is characterised in that: the set square ontology Surface is equipped with anti-slip sucking disc.