CN202685680U - Teaching compass capable of being used in various blackboards - Google Patents

Abstract

The utility model provides a teaching compass capable of being used in various blackboards. According to the structure of the teaching compass capable of being used in various blackboards, a cambered pulling plate with graduates is arranged between a positioning compass leg and a circle-drawing compass leg of the compass, the lower end of the positioning compass leg of the compass is provided with a device capable of reloading various positioning compass legs, and the lower end of the circle-drawing compass leg is provided with a clamp capable of clamping various drawing pens. The teaching compass capable of being used in various blackboards has the advantages of avoiding the situation that the two compass legs are unfixed in separated distance so that a drawn circle is not standard due to looseness of a bolt at a hinged position, being accurately and steadily centered on various smooth blackboards, and clamping the pens conveniently. Besides, a user can read out the radius of the drawn circle directly.

Description

A kind of compasses for teaching that can use at multiple blackboard

Technical field

The utility model relates to a kind of compasses, specifically a kind of compasses for teaching.

Background technology

At present, the teacher is lecturing mathematics or mechanical drawing class hour, explain at the blackboard upper drawing circle through compasses commonly used.But used compasses are often met the hinged place screw loosening and are difficult to guarantee that drawn compasses are whole; Also because blackboard is too smooth, the educational compasses of usefulness the displacement phenomenon of skidding will occur slightly because of carelessness usually; Moreover, measure also inconvenience of drawn radius of circle with this compasses.

Summary of the invention

The utility model provides a kind of compasses for teaching that can use at multiple blackboard.It has that centering is stable, distance is consistent all the time between two legs, and the characteristics that can directly read drawn radius of circle.

The technical solution adopted in the utility model is: at the set gauge leg of compasses and draw arc is housed between the compass leg and be with graduated arm-tie, the device of the multiple location regulation foot that can change the outfit is equipped with in the set gauge leg lower end of compasses, draws the compass leg lower end clip that can clamp multiple paintbrush then is installed.

The concrete structure of this compasses is: an articulated mounting has been installed below the cylindrical handle, has also been installed a set gauge leg and a picture compass leg on the articulated mounting; The upper end of these two rule legs is hinged by a screw, and these two rule midlegs are installed a bearing pin and a butterfly screws and an arm-tie; One end of arm-tie just is fixedly mounted on the rule leg by this bearing pin, and the remainder of arm-tie is passed by butterfly screws, and joins with another root rule leg; This piece arm-tie is arc, and with scale, the position, intermediate portion opened one slightly shorter than arm-tie, also be the slotted hole of arc; This slotted hole is established for arm-tie slides at that butterfly screws; The lower end of set gauge leg is a kind of device of the multiple location regulation foot that can change the outfit; The structure of this device is that one section of the lower end of set gauge leg must be hollow, and is provided with several trip bolts on hollow legs; The multiple location of the interchangeable grafting of this device regulation foot, which kind of regulation foot of pegging graft can be decided according to the material of blackboard: as using the iron pin of can pegging graft at wooden blackboard; Can peg graft with the sucker of universal joint in Glass blackboard usefulness; At the iron-based blackboard with pegging graft magnetic stripe and with the disk of universal joint; And that end of drawing compass leg has laterally been installed a pen clip, and this can change the multiple paintbrush of folder easily, as: chalk and other various paintbrushes.

The beneficial effects of the utility model are: compasses can fixedly not make the situation of drawn round irregularity because the hinged place screw loosening causes two legs distance; Can be accurately, firmly on various smooth blackboards centering it pen clip is convenient again; Can also directly read drawn radius of a circle.

Description of drawings

Accompanying drawing 1 is the utility model structural representation.

1 is that articulated mounting 2 is the set gauge leg among the figure; 3 is trip bolt; 4 are the location regulation foot; 5 is pen clip; 6 is the picture compass leg; 7 arm-ties.

The specific embodiment

Shown in accompanying drawing 1 embodiment: an articulated mounting (1) has been installed below the cylindrical handle, has been installed a set gauge leg (2) and a picture compass leg (6) on the articulated mounting.The upper ends of these two rule legs are hinged by a screw, at these two rule midlegs bearing pins and butterfly screws and an arm-tie (7) are installed.One end of arm-tie is fixedly mounted on this bearing pin, and the remainder of arm-tie is passed also by butterfly screws and another root rule leg joins.This piece arm-tie (7) is arc, and with scale, the position, intermediate portion opened one slightly shorter than arm-tie, also be the slotted hole of arc.This slotted hole is established for arm-tie slides at that butterfly screws.As long as after two rule legs distances of opening are determined, tighten its distance of opening of butterfly screws and just can not become.The lower end of set gauge leg (2) is a kind of device of the multiple location regulation foot (4) that can change the outfit.The structure of this device is that a section of set gauge leg lower end must be hollow, and the above also is provided with a trip bolt (3).This device can insert according to the material of blackboard multiple location regulation foot (4), such as the wooden blackboard iron pin of can pegging graft; Glass blackboard can be pegged graft with the sucker of universal joint; Can peg graft magnetic stripe (4) and with the disk of universal joint of iron-based blackboard.After the grafting, (3) as long as tighten trip bolt.And that end of drawing compass leg has laterally been installed a pen clip (5), and this can repeatedly change the multiple paintbrush of folder easily, as: chalk and other various paintbrushes.

Claims (3)

1. compasses for teaching that can use at multiple blackboard, it is an articulated mounting to be installed below the cylindrical handle, also installed on the articulated mounting by a set gauge leg and the picture compass leg that screw is hinged, it is characterized in that: at these two rule midlegs bearing pins and a butterfly screws and an arm-tie are installed; One end of arm-tie just is fixedly mounted on one of them rule leg by this bearing pin, and remainder is passed by this butterfly screws, and joins with another root rule leg; The lower end of set gauge leg is a kind of device of the multiple location regulation foot that can change the outfit; And that end of drawing compass leg has laterally been installed a pen clip.

2. a kind of compasses for teaching that can use at multiple blackboard according to claim 1 is characterized in that: the arm-tie that is installed in two rule midlegs is arc and with scale; The middle part of arm-tie remainder also opened one than arm-tie slightly short, parallel with arm-tie, also be the slotted hole of arc.

3. a kind of compasses for teaching that can use at multiple blackboard according to claim 1, it is characterized in that: one section of the lower end of set gauge leg must be hollow, and several trip bolts are housed in the above.

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