CN201140605Y - Automatic chalk holder - Google Patents

Abstract

An automatic chalk holder is composed of an external sleeve with dual-end spiral slot on its internal surface, an internal sleeve in said external sleeve, an elastic telescopic mouth on said internal sleeve, two long holes symmetrically arranged on said internal sleeve, a slide seat in said internal sleeve, and two symmetrical clamping heads on said slide seat. The advantages are that: the chalk box has the advantages of being simple in structure, convenient to operate, comfortable to use, capable of enabling the chalk not to be broken easily, preventing the chalk from being wasted, avoiding burning feeling caused by direct contact of the chalk with hands, and being sanitary and environment-friendly.

Description

Automatic chalk clamper

Technical field

The utility model belongs to the chalk clamping device, particularly a kind of automatic chalk clamper.

Background technology

At present, the teacher is directly hand-held chalk when using chalk in teaching process, and strength is slightly bigger when writing, and chalk will fracture, and causes very big waste; While teacher's Long contact time chalk, not only hand has burning sensation, and extremely unhygienic.

Summary of the invention

The purpose of this utility model is to solve the problems referred to above that prior art exists, provide a kind of simple in structure, easy to operate, use comfortable, as can to prevent chalk waste, economical and practical, hygienic environment-protecting automatic chalk clamper.

The utility model is achieved in that it has an outer sleeve, sleeve lining is provided with the twin-feed spiral groove outside, in outer sleeve, be provided with inner sleeve, be provided with the elastic telescopic mouth in the inner sleeve upper end, on inner sleeve, be arranged with two strip holes, be provided with sliding seat in inner sleeve, be arranged with two dops on sliding seat, said dop passes and is inserted in the twin-feed spiral groove by the strip hole respectively.

The utility model has the advantages that: simple in structure, easy to operate, use comfortablely, make not frangibility of chalk, prevent waste, and avoided the burning sensation that directly contacts chalk and produced with hand and hygienic environment-protecting.

Description of drawings

Fig. 1 is the structural representation of outer sleeve;

Fig. 2 is the structural representation of inner sleeve and sliding seat;

Fig. 3 is an assembling schematic diagram of the present utility model.

Among the figure: 1-outer sleeve, 101-twin-feed spiral groove, 2-inner sleeve, 201-elastic telescopic mouth, 202-strip hole, 3-sliding seat, 301-dop, 4-end cap.

The specific embodiment

As shown in the figure, the utility model has an outer sleeve 1, inwall at outer sleeve 1 is provided with twin-feed spiral groove 101, in outer sleeve 1, be fitted with inner sleeve 2, be provided with elastic telescopic mouth 201 in inner sleeve 2 upper ends, be arranged with two strip holes 202 on inner sleeve 2 vertically, by the end cap 4 that has been threaded, end cap 4 is connected back and locked by pin with inner sleeve 2 in inner sleeve 2 lower ends.Be provided with sliding seat 3 in inner sleeve 2, be arranged with two dops 301 in sliding seat 3 bottoms, said dop 301 passes and is inserted in the twin-feed spiral groove 101 by strip hole 202 respectively.

During use, a handgrip is lived outer sleeve 1, and the another handgrip is lived end cap 4, rotation inner sleeve 2, make sliding seat 3 in inner sleeve 2, slide into the top, elastic telescopic mouth 201 is strutted, can insert chalk, the counter-rotating inner sleeve 2 then, make sliding seat 3 to lower slider, when the length that is exposed at inner sleeve 2 outsides up to chalk is 1 centimeter left and right sides, the inner sleeve 2 that stops the rotation, this moment, chalk can use.

Claims (1)

1, a kind of automatic chalk clamper, it is characterized in that: it has an outer sleeve (1), be provided with twin-feed spiral groove (6) at outer sleeve (1) inwall, in outer sleeve (1), be provided with inner sleeve (2), be provided with elastic telescopic mouth (11) in inner sleeve (2) upper end, on inner sleeve (2), be arranged with two strip holes (14), in inner sleeve (2), be provided with sliding seat (7), be arranged with two dops (9) on sliding seat (7), said dop (9) passes and is inserted in the twin-feed spiral groove (6) by strip hole (14) respectively.

Images