CN201325237Y - Automatic chalk - Google Patents

Abstract

The utility model discloses an automatic chalk, belonging to writing stationery, in particular to a chalk. The automatic chalk is characterized in that the front end of a penholder is a Y-shape clamp, and a push pipe stroke positioning ring is arranged on the wall of the tail end thereof, a spring and a baffle installed in the pipe, and the push pipe of the chalk and a hand cap are all installed in the penholder through threads, and a damping ring is installed on the top outer wall of the propulsion pipe. Because the chalk in the utility model is sleeved in the push pipe, the chalk can be popped out through pressing the hand cap to push the push pipe for opening the Y-shape clamp, and the chalk is clamped by loosening the hand cap after reaching a certain length. The chalk can be avoided being broken as the outer length is short, the contamination of chalk to hand can be avoided by holding the penholder without contacting with chalk when in use, and the chalk in short length can be still used through the penholder. The automatic chalk not only can save chalk use amount, but also prevent contamination of the chalk to hands of teachers, and has simple structure and convenient use.

Description

Automatic chalk

Technical field

The utility model belongs to write uses stationery, particularly chalk.

Background technology

Chalk is teacher's indispensable Writing instrument of imparting knowledge to students, and chalk loss at that time is fast, and new chalk is oversize is broken into several sections easily, and chalk is taken inconvenience with having lacked hand, and chalk dust also pollutes hand.

The utility model content

Existing chalk is easily broken in order to overcome, the bad deficiency of taking, polluting hand of chalk head, and the utility model provides a kind of automatic chalk, and this automatic chalk can reduce not only that chalk is easily broken, the chalk head is bad takes, and can avoid chalk adversary's pollution.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of automatic chalk, it is characterized in that: the penholder front end is that trident dop tail end inwall has propulsion tube stroke locating ring, be installed in the propulsion tube in the penholder spring, catch and chalk are housed, propulsion tube is connected with manual cap thread, and propulsion tube top outer wall is equipped with brake hoop.

Because chalk sleeve is in propulsion tube in the utility model, press manual cap promotion propulsion tube and strut the ejection of trident dop chalk, reaching suitable length unclamps manual cap trident dop and blocks chalk, because chalk length weak point outside can be avoided fracture, hold penholder during use and do not contact the pollution of also just having avoided the adversary with chalk, with having lacked because of there being penholder still can normally use, the utility model is can save the chalk consumption to prevent the pollution of chalk to teacher's hand again, and it is simple in structure, easy to use.

Description of drawings

Accompanying drawing 1 is a structural representation of the present utility model,

Fig. 2 is the view of trident dop among Fig. 1

Among the figure, 1. chalk, 2. trident dop, 3. propulsion tube, 4. penholder, 5. catch, 6 springs, 7. propulsion tube stroke locating ring, 8. brake hoop, 9. manual cap.

The specific embodiment

The specific embodiment of the present utility model is, as shown in the figure:

Embodiment 1,: a kind of automatic chalk is characterized in that: penholder 4 front ends are that trident dop 2 tail end inwalls have propulsion tube stroke locating ring 7, be installed in the propulsion tube 3 in the penholder spring 6, catch 5 and chalk 1 are housed, propulsion tube is threaded with manual cap 9, and propulsion tube top outer wall is equipped with brake hoop 8.

Claims (1)

1. automatic chalk, it is characterized in that: the penholder front end is the trident dop, and the tail end inwall has propulsion tube stroke locating ring, is installed in the propulsion tube in the penholder spring, catch and chalk are housed, propulsion tube is connected with manual cap thread, and propulsion tube top outer wall is equipped with brake hoop.

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