CN2858302Y - Lifting chalk - Google Patents

Abstract

The utility model discloses a lifting chalk, which is pertains to a stationery, especially to a chalk. A lifting chalk has a structure that: a convex ring connected with the convex ribs on a rotating handle is provided on the bottom of the jacket; screws with big external thread are fixed on the rotating handle; a lifting plate with internal thread is installed on the screw; and the chalk with the inner hole is screwed on the screw. The practical effect of the new utility model is that when the rotating handle of the new utility model is rotated, the screw thread drives the lifting plate tomove up and down, thereby adjusting the length chalk putting out of the jacket, putting out chalk of the appropriate length when needed to provent break of the chalk and the waste that the chalk end is unable to use, and preventing the pollution of chalk because duiring the use of the chalk, it is only needed to handhold the jackets without direct contacting the chalk.

Description

Liftable chalk

Affiliated technical field

The utility model belongs to a kind of stationery, particularly chalk.

Background technology

Chalk is the stationery of using always, and the teacher carries out writing on the blackboard with it, directly be held in the chalk appearance usually handle make dirty very unhygienicly, chalk easy fracture when using in addition is when chalk has a large amount of chalk heads to be wasted with after short again because of holding incessantly.

Summary of the invention

The purpose of this utility model is both to prevent the dirty hand of chalk, does not rupture and can fully use the technical scheme of the novel chalk of chalk head.

The technical solution of the utility model is, a kind of liftable chalk, its structure is: the overcoat lower end has bulge loop to link to each other with fin on the rotating handle, is fixing big externally threaded screw rod on the rotating handle, tapped lifter plate is housed on the screw rod, and the chalk sleeve of band endoporus is on screw rod.

The beneficial effects of the utility model are that screw thread drive lifter plate moves up and down when rotation rotating handle of the present utility model, thereby regulate the length that chalk stretches out overcoat, chalk stretches out suitable length in the time of as required, hand prevents that disconnected chalk and chalk head from can't use the waste that causes, because only need be held overcoat and directly do not contact the pollution that chalk can prevent chalk when using this chalk.

Description of drawings

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

Among the figure, 1. chalk, 2. overcoat, 3. screw rod, 4. lifter plate, 5. bulge loop, 6. rotating handle.

The specific embodiment

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

Embodiment 1, a kind of liftable chalk, and its structure is: overcoat 2 lower ends have bulge loop 5 to link to each other with fin on the rotating handle 6, are fixing on the rotating handle and are being with externally threaded screw rod 3, and tapped lifter plate 4 is housed on the screw rod, and the chalk sleeve of band endoporus is on screw rod 1.

Claims (1)

1. liftable chalk is characterized in that: the overcoat lower end has bulge loop to link to each other with fin on the rotating handle, is fixing big externally threaded screw rod on the rotating handle, and tapped lifter plate is housed on the screw rod, and the chalk sleeve of band endoporus is on screw rod.