CN2188489Y - Writing chalk on blackboard - Google Patents

Abstract

The utility model relates to a writing chalk on a blackboard, wherein, a chalk core is arranged in a chalk core cylinder in a chalk holder; the tail end of the chalk core cylinder is connected with a feeding operator and the front end of the chalk core cylinder is in screw connection with a clamper; a locking ring and a spring are arranged on the clamper. The chalk core of the utility model is especially suitable for chalks and fingers can not directly touch the chalks. The utility model has the advantages of sanitary use, no pollution and convenient carrying.

Description

Writing chalk on blackboard

The utility model relates to a kind of writing on the blackboard pen that the pen core propulsion plant is arranged.

Chalk is still the teaching aid that generally uses in the present classroom instruction.At present, the use of chalk is still with hand and directly grips, hand and chalk direct friction, it not only easily plays dust, and contaminated air pollutes, corrodes finger skin, and the hand that pollutes by the teacher also can pollute to its clothes, books and other teaching aid, in experimental teaching, also can pollute instrument and sample, thereby shorten its service life.The teacher must wash one's hands after class, clean clothing, both inconvenient, also unhygienic.Because the powder ash of chalk very easily comes off, the chalk body is also easy to break broken, so use, carry also inconvenient.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and provides a kind of finger directly not contact chalk, and is pollution-free, uses, carries all writing on the blackboard pen easily.

The purpose of this utility model can reach by following measure:

A kind of writing on the blackboard pen, comprise penholder (4) and be located at the preceding cap (2) of penholder that its front end is threaded with it, pen core (1) is located in the penholder (4), its special character is, described pen core (1) is located in the interior pen core tube (8) of penholder (4), pen core tube (8) tail end is provided with the feeding executor (7) that is threaded with it, and pen core tube (8) front end is threaded with clamper (9), and retaining ring (10) is located at clamper (9) front portion; The taper convex edge of retaining ring (10) front end is stuck between the taper convex edge and penholder (4) front end of clamper (9) front end; Spring (3) is placed on the clamper (9), and the one end peaks on the boss of penholder (4) front inner wall, and the other end peaks at pen core tube (8) front end.

Cap (2) inwall front portion is provided with flexible barbs before the penholder of the present utility model.

Clamper of the present utility model (9) front end edge is axially arranged with at least three uniform grooves, is the state of slightly opening when making its front portion not be subjected to ambient pressure.

Accompanying drawing is a structural representation of the present utility model.

The utility model is described in further detail below in conjunction with accompanying drawing:

Referring to accompanying drawing, the front end of the utility model penholder 4 is provided with the preceding cap 2 of the penholder that is threaded with it, and the front port of cap 2 is used for clamping pen core 1 before the penholder, and its port inner wall is provided with hangnail.Pen core 1 rear portion is located in the pen core tube 8 in the penholder 4, and is anterior by clamper 9 clampings.Pen core feeding executor 7 is threaded with pen core tube 8 rear ends, and pen core tube 8 front ends are threaded with clamper 9 rear ends.Retaining ring 10 is placed in clamper 9 front ends, and between clamper 9 and penholder 4, the front end place of clamper 9 and retaining ring 10 is equipped with the taper convex edge, and the front end of retaining ring 10 is stuck on the convex edge of clamper 9, and the front end of penholder 4 is stuck on the convex edge of retaining ring 10.Spring 3 is placed on the clamper 9, and its tail end peaks on the front end of pen core tube 8, and its front end peaks on the boss of penholder 4 inwalls.The rear end of feeding executor 7 is provided with the core tube cap 6 that is threaded with it, can connect a pen clip 5 on the sidewall of feeding executor 7.During use, at first take off core tube cap 6, pen core 1 is packed in the pen core tube 8, be pushed into pen core 1 front end and stretch out cap 2 before the penholder, covering core tube cap 6 can write.When pen core 1 front end abrasion when the length inconvenience of cap 2 is write before stretching out penholder, press several core tube caps 6 or pen clips 5 down, to pen core 1 extension elongation is suitable write till.After pen core 1 uses up fully, can reinstall a new pen core 1.When core tube cap 6 or pen clip 5 are pressed one stroke, pen core tube 8 is pushed to penholder 4 front ends, before pen core tube 8 is pushed clamper 9 to again, retaining ring 10 is pushed to the place ahead together, during cap inwall boss, the thrust of 10 pairs of clampers 9 of retaining ring disappears before retaining ring 10 front ends are butted on penholder, and promptly retaining ring 10 is unclamped coupling mechanism force, pen core 1 is sent LAP forward with pen core tube 8, clamper 9, and spring 3 is compressed by the active force of pen core tube 8 front ends.When the active force of pushing core tube cap 6 or pen core 5 is removed, the elastic restoring force of spring 3 pushes up pen core tube 8 to penholder 4 tail ends, pen core tube 8 drives clamper 9 and resets therewith, top, clamper 9 front end taper convex edges is to retaining ring 10 front ends, the taper convex edge of retaining ring 10 is held out against by penholder 4 front ends again, and at this moment, the front end of penholder 4 slides to the tang portion of retaining ring 10 front end taper convex edges, the front end of retaining ring 10 slides to the tang portion of clamper 9 front end convex edges, with pen core 1 locking.Core tube cap 6 and pen clip 5 be resetting with pen core tube 8 also.Push core tube cap 6 or pen clip 5 repeatedly, pen core 1 will constantly move, and stretch out the preceding cap 2 of penholder.Pen core 1 of the present utility model can be chalk or multipurpose colour pen core; Retaining ring 10 and spring 3 adopt metal material; Penholder 4 and pen core tube 8 should be with rigid plastics or metal materials, and all the other parts can adopt the rubber-like plastic material, and clamper 9 also can adopt metal material.

The utility model compared with prior art has following advantage:

Finger does not directly contact chalk, uses clean, sanitaryly, pollution-free, simple in structure, with low cost, and chalk is not easy to break broken, saves chalk, uses, carries all to make things convenient for.

Claims (3)

1, a kind of writing on the blackboard pen, comprise penholder (4) and be located at the preceding cap (2) of penholder that its front end is threaded with it, pen core (1) is located in the penholder (4), it is characterized in that: described pen core (1) is located in the interior pen core tube (8) of penholder (4), pen core tube (8) tail end is provided with the feeding executor (7) that is threaded with it, pen core tube (8) front end is threaded with clamper (9), retaining ring (10) is located at clamper (9) front portion, and the taper convex edge of retaining ring (10) front end is stuck between the taper convex edge and penholder (4) front end of clamper (9) front end; Spring (3) is placed on the clamper (9), and the one end peaks on the boss of penholder (4) front inner wall, and the other end peaks at pen core tube (8) front end.

2, writing on the blackboard pen as claimed in claim 1 is characterized in that: cap (2) inwall front portion is provided with hangnail before the described penholder.

3, writing on the blackboard pen as claimed in claim 1 or 2 is characterized in that: described clamper (9) front portion is provided with at least three uniform grooves vertically.

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