CN2131707Y - Teaching compasses fixed and centered outside heart - Google Patents

Abstract

The utility model discloses an extracardiac fixation centering teaching compasses, it belongs to the cultural and educational apparatus field, and it is through the sucking disc at centre of a circle external fixation to solved compasses centering difficult and the unsafe problem of centering effectively, the spring clamp formula is adopted in the installation of chalk, makes the dismantlement very convenient, and it is applicable to at glass or more level and smooth drawing on the surface, convenient operation, and the size is accurate reliable.

Description

Teaching compass

The utility model belongs to culture and education apparatus field.

Present garden rule have various, ubiquitous problem is a centering difficulty, flourish along with educational undertaking, the continuous improvement of teaching condition, general school has all changed Glass blackboard, the Glass blackboard smooth surface, the garden regulation heart is difficulty more, the CN87215141 single pole sucked type teaching garden of announcing in the past rule, when random picture garden, solved the centering problem, and when drawing in the heart at accurate drawing or in known garden, this problem is also unresolved.

The utility model provides a kind of improved teaching garden rule, and it can draw garden, calibration accurately, easily, has solved the centering of teaching garden rule and the contradiction of accuracy effectively.

The utility model is finished by following mode: sucker is adopted in centering, one frame is arranged on sucker, one telescopic contact is housed, be used for determining the position of the garden heart at the one end, this contact is contained in an energy to be had in relative rotation in the mandrel with the connection frame, be equipped with one on the mandrel and connect the chi axle, it links to each other with ruler, and a chalk frame is slidably arranged on ruler, can obtain different garden radiuses by mobile penholder, in the penholder lower end one spring clip is housed, chalk is fixed, make chalk easy to loading and unloading; After transferring what a radius, trip bolt is tightened, hold the quill on the penholder at last, rotate around mandrel and just can obtain a garden.

Describe in further detail below in conjunction with accompanying drawing:

Fig. 1 is the wiring layout of these teaching garden rule.

Fig. 2 is the vertical view of wiring layout.

Be contained in an end of connection frame ［ 4 ］ with reference to Fig. 1 sucker ［ 1 ］, sucker ［ 1 ］ lining tightens up an awl spring ［ 2 ］ with screw ［ 3 ］, the effect of awl spring ［ 2 ］ is after sucker ［ 1 ］ is pressed, give ［ 1 ］ vertical bounce of sucker, to guarantee that sucker ［ 1 ］ does not come off, thereby strengthened the firm of mandrel ［ 9 ］ greatly, guaranteed that centering is reliable.Contact ［ 25 ］ is used for determining heart position, garden, determines that second line of a couplet frame ［ 4 ］ is pressed in the back well, and the garden heart is just fixing.Guide blot ［ 24 ］ makes that contact ［ 25 ］ and mandrel ［ 9 ］ are concentric and plays position-limiting action.Index plate ［ 5 ］ plays calibration and limits the axially movable effect of mandrel ［ 9 ］.Screw ［ 23 ］ plays fixed indexing plate ［ 5 ］.Be equipped with one and connect chi axle ［ 10 ］ on mandrel ［ 9 ］, it is linked together pointer ［ 7 ］, mandrel ［ 9 ］, scale ［ 12 ］ by nut ［ 8 ］, rivet ［ 11 ］, except that playing the connection effect, also make sizing, see that scale ［ 12 ］ makes things convenient for.After mobile penholder ［ 18 ］ is reserved scale, tighten up by holding screw ［ 13 ］, a sleeve ［ 14 ］ is housed above the penholder ［ 18 ］, it can rotate relative to bolt ［ 15 ］, makes when drawing more flexible.Bolt ［ 15 ］ is fixed on the penholder ［ 18 ］ by nut ［ 16 ］ and spring washer ［ 17 ］.Clip ［ 19 ］ is fixed on penholder ［ 18 ］ by screw ［ 20 ］, and another identical half of clip ［ 19 ］ unloads, and folder axle ［ 22 ］ is linked together clip ［ 19 ］ two halves, gives clamping force of clip by spring ［ 21 ］, thereby chalk is clamped.

Operating process is as follows: after loading onto chalk on the clip ［ 19 ］, left hand is held connection frame ［ 4 ］, make contact ［ 25 ］ the contact garden heart, loose one's grip after pressing, the right hand frame ［ 18 ］ that holds a pen, thumb and forefinger pinch screw ［ 13 ］, after mobile penholder ［ 18 ］ is decided scale, tighten screw ［ 13 ］, and then pinch sleeve ［ 14 ］ in forefinger with thumb, around mandrel ［ 9 ］ up time or draw the garden counterclockwise, the time spent can not unloaded with handgrip sucker ［ 1 ］ chassis one folder.

Claims (1)

1. A kind of heart external fixation centering teaching garden rule, sucker, contact, scale, mobile penholder with mechanical attachment is characterized in that sucker and contact are separately fixed at the two ends of connection frame, and scale rotates relative to contact axis, and mobile penholder is removable location on scale.

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