CN2900187Y

CN2900187Y - Automatic chalk

Info

Publication number: CN2900187Y
Application number: CN 200620082035
Authority: CN
Inventors: 刘曙光; 翟丹蛟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-22
Filing date: 2006-03-22
Publication date: 2007-05-16
Anticipated expiration: 2016-03-22

Abstract

The utility model discloses an automatic chalk, in particular to a moveable chalk with a feeding mechanism through slight press. The automatic chalk comprises a chalk holder and a chalk and is characterized in that: An internal sleeve is arranged in the lower part of the hollow chalk holder. In addition, an internal hollow pipe with a handle is positioned in the chalk holder. A lug boss is externally arranged around the center of the internal pipe. Outer wall at the lower end of the internal pipe is provided with 3 to 4 outwards inclined gripper jaws. A spring is arranged between the internal sleeve and lug boss. The utility model has the advantages that: While teachers are writing with the chalk, their hands have no contact with the chalk to avoid chalk dust contaminating hands. Proper extension of the installed chalk seldom undergoes fracture. Length of extended chalk is adjustable on demand. Short chalk can be gripped to make full use of scrap chalks.

Description

Automatic chalk

Affiliated technical field

The utility model belongs to a kind of writing appliance, particularly has the Propelling chalk of flicking propulsive mechanism.

Background technology

Chalk is that the teacher writes the most frequently used stationery of writing on the blackboard, and the hand that the easy dry linting dirt of chalk stains the teacher is disconnected easily when long chalk writes, with having lacked and bad taking.

Summary of the invention

The purpose of this utility model provides a kind of chalk dust that can prevent and stains hand, avoids the chalk fracture, makes full use of the technical scheme of the novel chalk of short chalk head.

The technical solution of the utility model is, a kind of automatic chalk, comprise penholder, chalk, its structure is: inner ring sleeve is arranged at the penholder bottom of hollow, the hollow interior pipe of band handle is installed in the penholder, the outer boss that is with in interior bar middle part, interior pipe lower end outer wall is divided into 3-4 outward-dipping gripper jaw, between inner ring sleeve and boss spring is arranged.

The employed chalk of the utility model is an equal diameter chalk bar.

The utility model using method is when needing chalk is installed, chalk can be installed in the interior pipe by the relieving of fixed handle compression spring gripper jaw; Install and stop to press handle spring and recover that bar rises in the length, the outward-dipping gripper jaw in interior bar lower end shrinks under the restriction of inner ring sleeve and tightens chalk, can write easily; Decontroling chalk by fixed handle compression spring gripper jaw when the chalk that exposes is too short moves downward and can be transferred to suitable length.

The beneficial effects of the utility model are: teacher's hand when writing can not contact with chalk and can prevent that chalk dust from staiing hand, back chalk protruded length is installed suitably to be difficult for rupturing, but regulated at will exposes chalk length, as long as just can clamp and to use short chalk head, can make full use of the chalk head.

Description of drawings

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

Fig. 2 be among Fig. 1 in the A-A of pipe to partial enlarged drawing.

Among the figure, 1. handle, 2. penholder, 3. in pipe, 4. chalk, 5. boss, 6. spring, 7. penholder inner ring sleeve, 8. gripper jaw.

The specific embodiment

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

Embodiment, a kind of automatic chalk, comprise penholder 2, chalk 4, its structure is: inner ring sleeve 7 is arranged at penholder 2 bottoms of hollow, the hollow interior pipe of band handle 1 is installed in the penholder, interior pipe middle part is outer to be with boss 5, and interior pipe lower end outer wall is divided into 3 outward-dipping gripper jaws 8, and spring 6 is arranged between inner ring sleeve and boss.

Claims

1. an automatic chalk comprises penholder, chalk, it is characterized in that: inner ring sleeve is arranged at the penholder bottom of hollow, the hollow interior pipe of band handle is installed in the penholder, the outer boss that is with in interior pipe middle part, interior pipe lower end outer wall is divided into 3-4 also outward-dipping gripper jaw, between inner ring sleeve and boss spring is arranged.