CN203004871U

CN203004871U - Multi-blade pencil sharpener

Info

Publication number: CN203004871U
Application number: CN 201320006262
Authority: CN
Inventors: 胡再国
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2013-01-07
Filing date: 2013-01-07
Publication date: 2013-06-19
Anticipated expiration: 2023-01-07

Abstract

A multi-blade pencil sharpener relates to the field of stationeries, particularly to a pencil sharpener for sharpening pencils. The pencil hole of a general pencil sharpener is of a conical surface and is short; the blade is easy to abrade and rust, and the pencil lead is easy to fracture; and a pencil sharpening machine has a smaller front end, so that fractured pencil lead tends to block the front end and the use is affected. In order to prevent pencil lead from being fractured, the utility model provides the multi-blade pencil sharpener. The technical scheme is as follows: a pencil hole is arranged in the multi-blade pencil sharpener and composed of a large round cylinder, a conical surface and a small round cylinder, wherein the conical surface is connected with the large round cylinder and the small round cylinder; three to four beads are symmetrically distributed on the conical surface; each bead is 1 mm higher than the conical surface; a rectangular hole is milled outside the conical surface and right cuts a half bead; and the rest beads form a knife edge. The multi-blade pencil sharpener has the following benefits: the front end of a pencil bears uniform stress; the large round cylinder is good for stabilizing direction of forward motion of the pencil; the small round cylinder is good for the sharpened powder of the pencil lead to leak; and the blades can be polished.

Description

Multi-blade pen-knife

Technical field

The present invention relates to stationery field, the pencil-knife that particularly sharpens a pencil.

Background technology

The blade of pencil-knife commonly used is generally iron plate, easily gets rusty, and causes the edge of a knife not sharp.

Because a hole of pencil-knife is taper seat, a boring ratio is shorter, easily causes the up and down fluctuation of pencil on direct of travel, causes the contact angle of lead for retractable pencil and blade large; In addition, firmly larger along with the wearing and tearing of blade, just can eliminate the wood materials of pencil, and only have a blade, easily cause discontinuity; In the situation that contact angle is large and firmly larger, pencil-lead very easily fractures.

A kind of pencil sharpener is arranged now, reduce the risk that fractures of pencil, but because front end is less, the lead for retractable pencil that easily causes fractureing is blocked in front end, causes follow-up pencil to advance, and follow-up sharpening a pencil can't be carried out; And front end seals, and the lead for retractable pencil that fractures also is not easy to draw out.

Summary of the invention

The risk that is fractureed for reducing pencil-lead, the present invention designs a kind of pencil-knife of multi-blade.

the present invention realizes that the technical scheme that goal of the invention adopts is: a kind of multi-blade pen-knife, pencil-knife adopts stainless steel material, the pencil-knife profile is comprised of a cylinder or cuboid and a circular cone, there is hole its inside, Kong Youyi large cylinder, taper seat and roundlet cylinder form, the diameter of large cylinder is 7-8mm, length 15-20mm, little drum diameter 2mm, taper seat connects large cylinder and little cylinder, the taper seat tapering is the 15-20 degree, preferred 20 degree, symmetrical 3-4 bar fin on taper seat, fin exceeds taper seat 1mm, mill out a rectangular opening outside cone, aperture width is at 1mm, the rectangular opening plane becomes 8-10 degree angle with the cone central plane, rectangular opening is just in time aimed at fin, cut fin half, remain half fin and form the edge of a knife.If fin is four, it is one group about centrosymmetric two fins, from direction of rotation, direction about centrosymmetric two blades is identical, and to opposite, namely pencil rotates a circle with another prescription, there are two blades to work, can eliminate two-layer skin, pencil is polished to two other blade simultaneously, makes blade sharper; If opposite spin, two other blade works the pen effect of cutting, and these two blades are polished.

The invention has the beneficial effects as follows:

(1), 3-4 bar fin forms 3-4 blade, makes the pencil front end stressed evenly, minimizing pen core risk of breakage.

(2), cuboid is conducive to hold, cylinder is easy to make.

(3), a Kong Youyi large cylinder, taper seat and roundlet cylinder form, the diameter of large cylinder is 7-8mm, large cylinder diameter and pencil diameter are close, length 15-20mm is conducive to stablize the direction of advance of pencil, the risk that the minimizing pen core is fractureed; Little drum diameter 2mm is conducive to the powder that pencil-lead eliminates and spills, and also is conducive to draw out the pen core that fractures, and reduces and stops up risk.

(4), the taper seat tapering is the 15-20 degree, is conducive to guarantee the intensity of pencil-lead front end.

(5) if fin is four, it is one group about centrosymmetric two fins, from direction of rotation, direction about centrosymmetric two blades is identical, to opposite, namely pencil rotates a circle with another prescription, has two blades to work, can eliminate two-layer skin, pencil is polished to two other blade simultaneously, makes blade sharper, after blade is sharp, can alleviate the dynamics of cutting pen, thereby be conducive to reduce the risk that fractures of pen core.

(6), pencil-knife adopts stainless steel material, can avoid getting rusty, extend the service life of pencil-knife and guarantee that the edge of a knife is sharp.

Description of drawings

Fig. 1 is the multi-blade pen-knife schematic diagram.

Fig. 2 is multi-blade pen-knife center sectional side elevation.

Wherein, 1, a hole, 2, blade, 3, leak cinder notch, 4, large cylinder, 5, taper seat, 6, little cylinder, 7, fin.

The specific embodiment

the pencil-knife profile is comprised of a cylinder or cuboid and a circular cone, there is hole 1 its inside, Kong Youyi large cylinder 4, taper seat 5 and roundlet cylinder 6 form, the diameter of large cylinder is 7-8mm, length 15-20mm, little drum diameter 2mm, taper seat connects large cylinder and little cylinder, tiny lead for retractable pencil powder can spill from little cylinder, the roundlet cylinder other end is called again leakage cinder notch 3, taper seat 5 taperings are the 15-20 degree, symmetrical 3-4 bar fin 7 on taper seat, fin exceeds taper seat 1mm, mill out a rectangular opening outside cone, aperture width is at 1mm, the rectangular opening plane becomes 8-10 degree angle with the cone central plane, rectangular opening just in time cuts fin half, remain half fin and form a blade 2.

If four fins, can make about centrosymmetric two fins is one group, from direction of rotation, direction about centrosymmetric two blades is identical, and to opposite, namely pencil rotates a circle with another prescription, there are two blades to work, can eliminate two-layer skin, pencil is polished to two other blade simultaneously, makes blade sharper; If opposite spin, two other blade works the pen effect of cutting, and these two blades are polished.

Claims

1. multi-blade pen-knife, it is characterized in that: the pencil-knife profile is comprised of a cylinder or cuboid and a circular cone, there is hole its inside, Kong Youyi large cylinder, taper seat and roundlet cylinder form, the diameter of large cylinder is 7-8mm, length 15-20mm, little drum diameter 2mm, taper seat connects large cylinder and little cylinder, the taper seat tapering is the 15-20 degree, symmetrical 3-4 bar fin on taper seat, fin exceeds taper seat 1mm, mill out a rectangular opening outside cone, aperture width is at 1mm, the rectangular opening plane becomes 8-10 degree angle with the cone central plane, rectangular opening just in time cuts fin half, remain half fin and form the edge of a knife.

2. a kind of multi-blade pen-knife according to claim 1, is characterized in that: pencil-knife employing stainless steel material.

3. a kind of multi-blade pen-knife according to claim 1, it is characterized in that: fin is four, be one group about centrosymmetric two fins, from direction of rotation, identical about the direction of centrosymmetric two blades, with another prescription to opposite, be that pencil rotates a circle, have two blades to work, can eliminate two-layer skin, pencil is polished to two other blade simultaneously, makes blade sharper; If opposite spin, two other blade works the pen effect of cutting, and these two blades are polished.