CN2301334Y

CN2301334Y - Pencil sharpener with pull back

Info

Publication number: CN2301334Y
Application number: CN 97233277
Authority: CN
Inventors: 李世伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-06-11
Filing date: 1997-06-11
Publication date: 1998-12-23
Anticipated expiration: 2007-06-11

Abstract

A pull-type pencil sharpener is composed of a cutting part and a pull-type part. The cutting portion has a standard guard blade. The pencil sharpener is characterized in that the blade pressing cover, the blade seat and the return force part are provided with double springs for return force, the movable sliding block with the conical surface pushes and presses the pencil, the blade can be used for stringing and changing the blade with a blunt blade, so that the blade is kept sharp, the pencil sharpener is safe, labor-saving, reliable and continuous in lead cutting, and is particularly suitable for children to sharpen various pencils and engineering drawing pencils.

Description

The power of returning broaching pencil-knife

The utility model is that a kind of broaching formula is returned the power pencil-knife.

The pencil-knife that uses is pencil sharpener mostly now, and after use a period of time, blade is neither sharp, sharpens a pencil and requires great effort, and plumbous thickness inconvenience is controlled.

In order to address these problems, way is to change rotate the turning formula as the broaching formula that spurs pencil into usually.A kind of cutter that sharpens a pencil that Chinese patent application 89206685 proposes when broaching, needs to apply a pressure and a pulling force on pencil.The tapering of uncontrollable besides pencil head, awl are grown, pulling force is big or small, and student's operation easier is bigger.

The purpose of this utility model is that a kind of improved time power broaching pencil-knife will be provided, and non-breaking lead also can be easy to control tapering, awl length and plumbous length.Blade is with going here and there cutter or replacing after blunt.

The purpose of this utility model is achieved in that by the cutting tip and the power of returning partly to be formed.Cutting tip is to fix standard single face security personnel blade, blade bearing, the sloping portion on the blade cover, the inclined plane when becoming the broaching pencil between blade bearing and blade cover.The power of returning partly above track, adopts the slide block pushing pencil of the horizontal slip of dual spring pushing, and there is the half cone face contact position of slide block and pencil, and is laborsaving, easy to operate when making broaching, also controlled cone angle, and awl is long.There is spacing hole in the place ahead of track, and lead can pass through, and wooden part can not be passed through, and plumbous length can be cut on demand.Blade unclamps the screw of fastening blade cover with blunt back, goes here and there cutter, and tool changing makes the cutter maintenance sharp.

The standard single face security personnel blade that cutting tip of the present utility model uses, blade part is two-sided wedge shape, in order when broaching a rational cutting angle to be arranged, reduces cutting force, the downward-sloping 13-16 of track °, guiding when being used to broach.Guarantee effectively a cutting and a rational thickness of cutting, the length that blade stretches out track is moderate, in order to guarantee the accurate position of blade at its width, locate by the locating surface on the blade bearing, even, during the tool changing sheet, also can guarantee the position accurately and reliably at the string cutter.Return the power part, two springs that horizontal direction is symmetrically distributed, the movable slider that will have the half cone face is pressed on the pencil dimension face, slide block is with back and forth broaching reciprocating motion in the horizontal direction of pencil, pencil pushes along track, because compression spring, spring just acts on power on the pencil conical surface, this power is decomposed into the Fx component of direction along ng a path and the component Fn of vertical track, Fx is consistent with the cutting force direction in the impulse stroke of broaching, can play the effect that reduces cutting force, i.e. the restoring force of spring, Fn is vertical with the direction of broaching.Play the effect of the pushing conical surface, the effective cutting when guaranteeing broaching.In the broaching idle running, Fx is a resistance, and is because Fx becomes big gradually by 0, very little to pushing away the pencil influence.So it is easily laborsaving during broaching.The half cone face is arranged on the movable slider, compress the pencil conical surface, drive a rectangular locating hole in track the place ahead and intersection, blade bearing side, lead for retractable pencil can freely pass through, and pencil awl length, cone angle are controlled like this, and plumbous length can be adjusted arbitrarily, when stroke of broaching, when layer of wood cut, slide block promptly stopped and breaking away from pencil, and is plumbous sliding and hard, the thick automatic minimizing of smear metal, can not cut sharply excessively, as thicker, scraping separately.

The concrete structure of utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is that Fig. 2 is vertical view and partial view according to the cutaway view of the power of the returning broaching pencil-knife that the utility model proposes.

Describe in detail below in conjunction with Fig. 1, according to the details and the working condition of the concrete device that the utility model proposes.

This pencil-knife comprises a standard single face security personnel blade 10, with two screws 12, blade cover 6, blade 10 is fixed on the blade bearing 2, the locating surface 11 of blade bearing 2 is used for blade 10 widths location, when needing the string cutter or changing blade, loosening screw 12 moves the position to blade 10 along its length direction string, or change new blade, again with screw means, have a clinoplain track 4 on the blade bearing 2, be used for the pencil guiding, during the cutting pencil, push along track 4 in the half cone hole 9 of movable slider 8, spring and pushing slide block 8, with the pencil swivel motion of coming together, spur pencil at every turn and can downcut the pencil bits in track 7, the pencil bits fall into pencil by the open slot blade under and consider to be worth doing in the box 1.After the smear metal in the smear metal box 1 is full, can takes off the smear metal box from blade bearing and outwell.

The utility model broaching is laborsaving, non-breaking lead, and handling safety, convenient, be particularly useful for children and cut various pencils, engineering drawing sharpens a pencil also very suitable.

Claims

1: this pencil-knife has standard single face security personnel blade 10, by blade cover 6 it is clamped on the blade bearing 2, it is characterized in that blade 10 is by thereafter locating surface 11 location; There is the movable slider 8 by dual spring 5 pushings inclined plane 4 tops, form restoring force, pressure to pencil when the broaching pencil.

2: pencil-knife according to claim 1, its feature blade 10 is located by locating surface 11 thereafter.

3: pencil-knife according to claim 1 is characterized in that track 4,13-16 ° at its inclination angle.

4: pencil-knife according to claim 1 is characterized in that by dual spring 5 pushing slide blocks 8.

5: pencil-knife according to claim 1.It is characterized in that having 30-36 ° half cone face in the broaching process, to contact below the movable slider 7, produce restoring force and pressure during broaching with the pencil conical surface.