CN102963195A

CN102963195A - Equidirectional dual-blade pencil sharpener

Info

Publication number: CN102963195A
Application number: CN2012105303730A
Authority: CN
Inventors: 胡再国; 雍志华; 李娟�
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2013-03-13

Abstract

An equidirectional dual-blade pencil sharpener relates to the field of stationary and particularly relates to a pencil sharpener on which force is applied symmetrically. A simple pencil sharpener has only one blade, and the applies force is asymmetrically, so that pencil core is easily broken; and a spiral edge pencil sharpener has a high price, and if the pencil core is broken at the front end, pencil sharpening cannot be performed any longer, a handle is easily damaged, and the pencil sharpener is discarded. Aiming at promoting the symmetric force application of a pencil sharpener, the invention provides the equidirectional dual-blade pencil sharpener, which adopts the following technical scheme: a trapezoid base is arranged, a through hole is formed between the upper end face and the lower end face inside the base, the through hole is formed by a column hole at the front end a tapered hole at the rear end, and a through hole is formed on the two trapezoid faces; two grooves are arranged on two rectangular faces and notches are formed on the tapered hole; and two blades are fixed in the grooves. The invention has the benefits that force is applied symmetrically during pencil sharpening, and the possibility of pencil point fracture is lowered; and the device is simple, the cost is low, and fractured pencil core can be easily taken out.

Description

A kind of in the same way double blade pencil-knife

Technical field

The present invention relates to the stationery field, particularly a kind of symmetry pencil-knife of exerting oneself.

Background technology

Easy pencil-knife all only has a blade, only has a place stressed, because stressed asymmetric, and the pencil-lead poor flexibility, firmly then do not cut the outside wooden of pencil, firmly then cause easily lead for retractable pencil to be fractureed.

A kind of spiral edge of a knife penknife is arranged now, and penknife is expensive; Penknife can be realized firmly symmetrical, has reduced the risk that fractures of lead for retractable pencil, but because front end is more tiny, in case lead for retractable pencil fractures at front end, the lead for retractable pencil that then is difficult to fracture takes out, before the lead for retractable pencil that fractures is blocked in, limited moving ahead of pencil, caused to continue to sharpen a pencil.And the spiral knife edge device is complicated, needs rotary handle, and for reducing cost, rotary handle is whole-colored plastics, and rotary handle fractures easily, causes device to be scrapped.

Summary of the invention

For promoting penknife firmly symmetrical, the present invention designs a kind of in the same way double blade pencil-knife.

The present invention realizes that the technical scheme that goal of the invention adopts is: a prismatoid pedestal, and the pedestal that namely upper surface is little, the lower surface is large, upper surface and lower surface are rectangle, and two sides are trapezoidal, and former and later two faces are rectangle; Between upper surface and the lower surface through hole is arranged in the pedestal, through hole is comprised of the cylindrical hole of front end and the conical bore of rear end, the conical bore top is connected with cylindrical hole, aperture and cylindrical hole are consistent, there is a through hole side of cylindrical hole and conical bore connection, and the through hole two ends are positioned on two trapezoidal faces.

Dig two grooves at rectangular two faces, notch is positioned on the conical bore, two blades are fixed in the groove of cutting, direction of rotation from pencil, the direction of two edges of a knife is identical, and namely pencil is rotating a circle, and will be reamed two-layer skin, the edge of a knife hides notch half, and remaining half width of rebate is emerged for pencil chip.

The invention has the beneficial effects as follows: two blade acting in conjunction pencils are arranged, when sharpening a pencil symmetrical firmly, avoid hilted broadsword asymmetric firmly, reduce the pen core risk that fractures, and cost only increases a blade; There is the through hole of a diameter 3mm side, can observe pen core front end situation, if the pen core accident fractures simultaneously, can draw out the fragment that fractures from this hole, avoids because the obstruction of the pen core that fractures can't be carried out the follow-up pen of cutting; For the pencil sharpener of the spiral edge of a knife, device is simple, and is with low cost, and is easy to draw out the lead for retractable pencil that fractures.

Description of drawings

Fig. 1 is double blade pencil-knife schematic diagram in the same way.

Wherein, 1, blade, 2, conical bore, 3, through hole.

The specific embodiment

A prismatoid pedestal, the pedestal that namely upper surface is little, the lower surface is large, upper surface and lower surface are rectangle, and two sides are trapezoidal, and former and later two faces are rectangle, upper end face length 4-5cm, wide 1cm; Lower end face length 4-5cm, wide 2cm; Between upper surface and the lower surface through hole is arranged in the pedestal, through hole is comprised of the cylindrical hole of front end and the conical bore 2 of rear end, the long 3-5mm of cylindrical hole, diameter 3mm, conical bore 2 tops are connected with cylindrical hole, aperture and cylindrical hole are consistent, be 3mm, there is a through hole 3 side of cylindrical hole and conical bore 2 junctions, and diameter is 3mm; A thick stomidium of conical bore 2 directly is 1cm, and the coning angle of conical bore 2 is 20 degree.

Dig two grooves at rectangular two faces, notch is positioned on the conical bore 2, width of rebate 2mm, and two blades 1 are fixed in the groove of cutting, front end distance between two blades is 0-0.5mm, from the direction of rotation of pencil, the direction of two edges of a knife is identical, and namely pencil is rotating a circle, to be reamed two-layer skin, the edge of a knife hides notch half, and width of rebate is 1mm after namely hiding, and the width of this 1mm is emerged for pencil chip.

Claims

1. a double blade pencil-knife in the same way is comprised of pedestal, double blade, it is characterized in that: a prismatoid pedestal, and the pedestal that namely upper surface is little, the lower surface is large, upper surface and lower surface are rectangle, and two sides are trapezoidal, and former and later two faces are rectangle; Between upper surface and the lower surface through hole is arranged in the pedestal, through hole is comprised of the cylindrical hole of front end and the conical bore of rear end, and the conical bore top is connected with cylindrical hole, and aperture and cylindrical hole are consistent; There is a through hole side of cylindrical hole and conical bore connection, and the through hole two-port is positioned on two trapezoidal faces; Dig two grooves at rectangular two faces, notch is positioned on the conical bore, two blades are fixed in the groove of cutting, direction of rotation from pencil, the direction of two edges of a knife is identical, and namely pencil rotates a circle, and will be reamed two-layer skin, the edge of a knife hides notch half, and remaining half width of rebate is emerged for pencil chip.

2. a kind of in the same way double blade pencil-knife according to claim 1 is characterized in that: upper end face length 4-5cm, wide 1cm; Lower end face length 4-5cm, wide 2cm.

3. a kind of in the same way double blade pencil-knife according to claim 1 is characterized in that: the long 3-5mm of cylindrical hole, diameter 3mm.

4. a kind of in the same way double blade pencil-knife according to claim 1, it is characterized in that: the through-hole diameter of the trapezoidal faces of pedestal side is 3mm.

5. a kind of in the same way double blade pencil-knife according to claim 1 is characterized in that: a thick stomidium of conical bore directly is 1cm, and the coning angle of conical bore is 20 degree.

6. a kind of in the same way double blade pencil-knife according to claim 1 is characterized in that: the width of rebate of two grooves digging at rectangular two faces is 2mm, installs that the residue width of rebate is 1mm behind the blade.

7. a kind of in the same way double blade pencil-knife according to claim 1 is characterized in that: the front end distance between two blades is 0-0.5mm.