CN103963515A

CN103963515A - Chalk cover

Info

Publication number: CN103963515A
Application number: CN201410230878.4A
Authority: CN
Inventors: 陆卫娟; 王东明; 任文庭; 王建国; 刘明明; 谷桐宇
Original assignee: Shanxi Institute of Mechanical and Electrical Engineering
Current assignee: Shanxi Institute of Mechanical and Electrical Engineering
Priority date: 2014-05-28
Filing date: 2014-05-28
Publication date: 2014-08-06

Abstract

The invention discloses a chalk cover which has a certain protective effect, has less possibility of wasting chalks and reduces environmental pollution. The chalk cover comprises a sleeve, a spiral pipe, a guide pipe, a guide column and a clamping head, wherein the spiral pipe is mounted in the sleeve and in clearance fit with the sleeve, and the guide pipe is mounted in the spiral pipe and in clearance fit with the spiral pipe; a bulge on the guide pipe is embedded in a concave hole in the sleeve, and the guide column is mounted in the guide pipe; two sliding blocks on the guide column are embedded in sliding openings in the guide pipe and in clearance fit with the sliding openings, and the raised parts of the two sliding blocks are positioned in spiral grooves in the inner wall of the spiral pipe and rotatably matched with the spiral grooves; the clamping head is inserted at the opening end of the guide pipe. A chalk is unlikely to be broken under the protection of the wall of the guide pipe. When the sleeve and the spiral pipe oppositely rotate, the guide column is compelled to move upwards in the guide pipe, and the chalk extends out the clamping head. As a person does not need to directly hold the chalk by hands, the usage rate of the chalk is high, discarded chalk heads are relatively short, the resource is conserved, and the environmental pollution is reduced.

Description

A kind of chalk sleeve

Technical field

The present invention relates to a kind of chalk sleeve.

Background technology

Tradition traditional instruction ubiquity still in most ofs large, medium and small schools of China, student has also been familiar with and custom to this teaching pattern, and short time inner multimedia is imparted knowledge to students can not replace this traditional teaching mode of chalk-blackboard completely.Chalk and blackboard coordinate teacher's both hands and the brain of wisdom to complete arduous teaching, and " to dead silk side to the greatest extent, it is dry that candle becomes grey tear to begin to silkworm in spring ", be teacher's portrayal in all one's life, but the too busy to get away chalk of teacher has but brought great harm to them.First, it is endangering teachers' respiratory system, and teacher's both hands are not escaped the corrosion of chalk yet simultaneously.The long-term chalk that uses can make skin on hand become dry, and sclerosis, casts off a skin.In cold winter, teacher has a class in defensive position at every turn and is stained with chalk dust, and washes one's hands and there is no hot water supply in general school instruction place, and washing one's hands with cold water is after class also a painful thing.Traditional chalk using method has not only brought great injury but also its service condition also to allow of no optimist to teacher.Secondly, when chalk uses certain length, be just difficult for having pinched, be difficult to continue to use, and in use the also a lot of of fracture occur, this phenomenon has caused larger waste, has also caused certain environmental pollution.

Summary of the invention

The object of this invention is to provide and a kind of user is had certain protective role and is difficult for causing chalk waste, alleviates the chalk sleeve of environmental pollution.

Technical scheme of the present invention is: comprise sleeve pipe, helix tube, conduit, guide pillar and chuck; Described sleeve pipe one end opening, other end inwall is provided with shrinkage pool, and described helix tube inwall is provided with helical groove, described conduit one end opening, other end outer wall is provided with the projection corresponding with internal surface of sleeve pipe shrinkage pool, and conduit is provided with two relative axial sliding mouths, guide pillar is cylinder, and its cylinder is provided with two slide blocks; Helix tube is contained in sleeve pipe and coordinates with shell clearance, catheter cartridge in helix tube and with helix tube matched in clearance, supravasal projection is embedded in the shrinkage pool in sleeve pipe, guide pillar is contained in conduit, two slide blocks on guide pillar are embedded in supravasal sliding mouthful and with sliding mouth and are slidably matched, two slide block ledges are positioned at the helical groove of helix tube inwall, and coordinate with helical groove rotation, and chuck is inserted in catheter opening end.

In the present invention, chalk packs conduit into, and chalk is subject to the not easy fracture of protection of catheter wall, even if fracture does not affect its use substantially yet.When sleeve pipe is relative with helix tube while rotating, sleeve pipe drives conduit synchronous rotary simultaneously, guide pillar rotates with conduit, two slide blocks on guide pillar are embedded in the helical groove in helix tube, force guide pillar to move forward in conduit, be positioned at the chalk of conduit inner guiding post front end pushed outwards enter, make chalk stretch out chuck.According to the use amount of chalk, turn sleeve pipe or helix tube are the overhang of adjustable chalk.Owing to not needing staff directly to arrest, the utilization rate of chalk is higher, and discarded chalk end is shorter, has saved resource, has also reduced the pollution to environment.

Brief description of the drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is the cutaway view of Fig. 1.

Fig. 3 is the STRUCTURE DECOMPOSITION schematic diagram of Fig. 1.

Fig. 4 is the schematic diagram of conduit.

Fig. 5 is the structural representation of sleeve pipe.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further detail, but does not form any limitation of the invention.The present invention includes sleeve pipe 1, helix tube 2, conduit 3, guide pillar 5 and chuck 4; Described sleeve pipe 1 one end openings, other end inwall is provided with shrinkage pool, described helix tube 2 inwalls are provided with helical groove, described conduit 3 one end openings, other end outer wall is provided with the projection corresponding with sleeve pipe 1 inwall shrinkage pool, conduit 3 is provided with two relative axial sliding mouths, and guide pillar 5 is cylinder, and its cylinder is provided with two slide blocks; Helix tube 2 be contained in sleeve pipe 1 and with sleeve pipe 1 matched in clearance, conduit 3 be contained in helix tube 2 and with helix tube 2 matched in clearance, projection on conduit 3 is embedded in the shrinkage pool in sleeve pipe 1, guide pillar 5 is contained in conduit 3, two slide blocks on guide pillar 5 are embedded in sliding mouthful on conduit 3 and with sliding mouth and are slidably matched, two slide block ledges are positioned at the helical groove of helix tube 2 inwalls, and coordinate with helical groove rotation, and chuck 4 is inserted in conduit 3 openends.

In the present invention, chalk packs conduit 3 into, and chalk is subject to the not easy fracture of protection of catheter wall, even if fracture does not affect its use substantially yet.In the time of sleeve pipe 1 rotation relative with helix tube 2, sleeve pipe 1 drives conduit 3 synchronous rotaries simultaneously, guide pillar 5 rotates with conduit 3, two slide blocks on guide pillar 5 are embedded in the helical groove in helix tube 2, force guide pillar 5 to move forward in conduit 3, be positioned at the chalk of conduit 3 inner guiding post 5 front ends pushed outwards enter, make chalk stretch out chuck 4.According to the use amount of chalk, turn sleeve pipe 1 or helix tube 2 are the overhang of adjustable chalk.Owing to not needing staff directly to arrest, the utilization rate of chalk is higher, and discarded chalk end is shorter, has saved resource, has also reduced the pollution to environment.

Claims

1. a chalk sleeve, is characterized in that: comprise sleeve pipe (1), helix tube (2), conduit (3), guide pillar (5) and chuck (4), described sleeve pipe (1) one end opening, other end inwall is provided with shrinkage pool, described helix tube (2) inwall is provided with helical groove, described conduit (3) one end openings, other end outer wall is provided with the projection corresponding with sleeve pipe (1) inwall shrinkage pool, conduit (3) is provided with two relative axial sliding mouths, and guide pillar (5) is cylinder, and its cylinder is provided with two slide blocks, helix tube (2) be contained in sleeve pipe (1) and with sleeve pipe (1) matched in clearance, conduit (3) be contained in helix tube (2) and with helix tube (2) matched in clearance, projection on conduit (3) is embedded in the shrinkage pool in sleeve pipe (1), guide pillar (5) is contained in conduit (3), two slide blocks on guide pillar (5) are embedded in sliding mouthful on conduit (3) and with sliding mouth and are slidably matched, two slide block ledges are positioned at the helical groove of helix tube (2) inwall, and coordinate with helical groove rotation, chuck (4) is inserted in conduit (3) openend.