CN2088480U

CN2088480U - Multifunctional automatic chalk cover

Info

Publication number: CN2088480U
Application number: CN 91206741
Authority: CN
Inventors: 李西昌; 晏双利
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-27
Filing date: 1991-04-27
Publication date: 1991-11-13

Abstract

The utility model relates to a multifunctional automatic chalk cover, mainly composed of a core tube, an outer cover and a ferule draw rod, wherein, one end of the core tube is provided with an elastic claw, a spring is sheathed on a smoothing part near the middle part of the core tube, and the other end of the core tube is provided with a core tube handle connected with the ferule draw rod. The core tube is inserted into the outer cover from the large tube diameter end of the outer cover, and the position of a chalk is regulated by the core tube handle and/or the ferule draw rod.

Description

Multifunctional automatic chalk cover

The utility model relates to a kind of multi-functional automatic chalk sheath, particularly has the multi-functional automatic chalk sheath of teacher's pointer.

General chalk is made by chalk or land plaster, and numerous educators are teacher particularly, and finger is long-term for chalk infects, a few peoples because of skin to gypsum allergy, or split so that contact chalk generation pain because of the finger tip gruel.And chalk can not utilize fully, and hand-held end is usually thrown away, and adds hand-heldly to write frangibility, and the chalk utilization rate is reduced.Teacher's pointer is the thing of teacher's indispensability on the other hand, and teacher's pointer just used separately in the past, increased trouble to the teacher.

The purpose of this utility model is that a kind of multi-functional automatic chalk sheath will be provided, and it can prevent effectively that finger from directly contacting with chalk, and it is flexible that this sheath can be regulated chalk, again can be as teacher's pointer.

The purpose of this utility model is achieved in that and is provided with a core pipe in the chalk sheath, and this core Guan Yousi sheet is the umbrella elastic claw of certain interval, in its end stupefied limit is arranged, and spring housing is at core pipe smooth, and the one end is propped up by core pipe pommel portion mill dell.The outer tube internal diameter is made large and small two parts, and the core pipe inserts overcoat, and the caliber platform of little caliber props up the spring other end, and the stupefied checkpost of core pipe is fixed the core pipe at the overcoat edge.Cylindrical chalk is put into the core pipe, connect by core pipe handle and/or teacher's pointer pull handle.The chalk position is regulated in the push-and-pull of bar.

The utility model is because only have propulsive mechanism and a retaining mechanism, thus simple in structure, and can freely control the flexible of chalk, thus it is convenient that the chalk sheath is used, and chalk is utilized fully, reduced the waste of chalk head.

Again because the utility model has telescopic teacher's pointer, make the teach educational aid of usefulness of teacher reach and kill two birds with one stone convenient teaching.

The utility model chalk sheath volume is little, in light weight, and have not Ka, so easy to carry.

The utility model chalk sheath uses the right cylindrical chalk, compares with existing truncated cone-shaped chalk and economizes in raw materials about 42%.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is according to the multifunctional chalk sheath schematic diagram that the utility model proposes.1-chalk wherein, the 2-elastic claw, the 3-overcoat, 4-does not block, 5-core pipe handle, 6-teacher's pointer pull bar, 7-teacher's pointer drawhead.

Fig. 2 is according to the multifunctional chalk sheath core pipe schematic diagram that the utility model proposes.The 2-elastic claw, 5-core pipe handle, 8-core pipe, 9-spring, 14-internal thread.

Fig. 3 is according to the multifunctional chalk sheath overcoat profile that the utility model proposes.10-tubule path portion wherein, 11-caliber platform, the other draw-in groove of 12-, 13-bassoon path portion.

Fig. 4 is according to the multifunctional chalk sheath teacher's pointer pull bar schematic diagram that the utility model proposes.6-teacher's pointer pull bar wherein, 7-teacher's pointer drawhead, 15-screw rod.

Below in conjunction with details and the working condition of accompanying drawing detailed description according to the concrete device that the utility model proposes.

Core pipe (8) forms by the aluminium alloy roll-in with overcoat (3), core pipe (8) has four umbrella elastic claws that are certain interval, and there is stupefied limit the pawl end, and spring (9) is enclosed within core pipe (8) the level and smooth position at middle part approximately, and the end mill dell of one end and core pipe handle (5) offsets.Bassoon path portion (11) one ends of core pipe by overcoat are inserted, and elastic claw this moment (2) shrinks, and till in place, caliber platform (11) props up spring (9) other end, and the overcoat edge is lived in the stupefied checkpost of core tube end.Ka (4) do not made by stainless steel, lock ring is in the other draw-in groove (12) on overcoat top.Pull bar (6) is formed by connecting by cold drawing steel tube or other material, and is connected on the internal thread (14) on the core pipe handle (5) by screw rod (15), plays the effect of blocking chalk simultaneously.

The available chalk material of chalk (1) is made right cylindrical, chalk is put into the core pipe can have dual mode: A. to be inserted by core pipe (8) front port, with hand push core pipe handle (5) and/or teacher's pointer pull bar (6), spring (9) compresses, and the core pipe spues, and its spring detent (2) opens, chalk (1) is inserted, and be placed on the appropriate location, and the openhanded spring (9) of opening recovers elasticity, and spring detent (2) catches chalk to be fixed.B. insert by core pipe handle (5) end, extract core pipe (8), back out teacher's pointer pull bar (6), put into chalk (1), twist good teacher's pointer pull bar (6) again, core pipe (8) is inserted, by using hand push core pipe handle (5) and/or teacher's pointer pull bar (6), core pipe (8) is put into overcoat (3), and regulate the chalk position with the A method.Preferred A kind mode, the adjusting of chalk is as described in the A method during use.Fig. 1 is that the multi-functional automatic chalk sheath of the utility model is in the position when regulating chalk.

When the teacher's pointer pull bar uses, can be elongated on demand as long as pull out pull bar, can be used as teacher's pointer and be used to indicate literal or chart.

Claims

1, a kind of multi-functional automatic chalk sheath, it is characterized in that a core pipe (8) is arranged in overcoat (3), one end of core pipe (8) is elastic claw (2), spring (9) is enclosed within core pipe (8) the level and smooth position at middle part approximately, other end core pipe handle (5) links to each other with teacher's pointer pull bar (6), core pipe (8) inserts overcoat (3) by the big caliber end of overcoat (13), regulates the chalk position by core pipe handle (5) and/or teacher's pointer pull bar (6).

2, multi-functional automatic chalk sheath according to claim 1 is characterized in that said elastic claw (2) is made up of four umbrella sheets that are certain interval, in the pawl end stupefied limit is arranged.

3, multi-functional automatic chalk sheath according to claim 1 is characterized in that said spring (9) when compressing, and an end and core pipe handle (5) offset, and the other end and overcoat caliber platform (11) offset.

4, multi-functional automatic chalk sheath according to claim 1 is characterized in that said core pipe handle (5) and teacher's pointer pull bar (6) are the screw thread screwed connections.