CN2224742Y - high performace pencil sharpener with low lead-breaking rate - Google Patents
high performace pencil sharpener with low lead-breaking rate Download PDFInfo
- Publication number
- CN2224742Y CN2224742Y CN 94223460 CN94223460U CN2224742Y CN 2224742 Y CN2224742 Y CN 2224742Y CN 94223460 CN94223460 CN 94223460 CN 94223460 U CN94223460 U CN 94223460U CN 2224742 Y CN2224742 Y CN 2224742Y
- Authority
- CN
- China
- Prior art keywords
- blade
- pencil
- lead
- sharpener
- knife rest
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a highly efficient pencil sharpener with a low lead-breaking rate, which is composed of a sharpener frame, a blade, and a blade fastening screw. The utility model is characterized in that a circular pencil guiding hole is arranged in the front of the taper hole of the pencil sharpener, a sharpener containing table forms the structure of a cambered surface plus a plane, and the left end of the blade closes with the inner side of the left wall of the sharpener frame. When the utility model is used to sharpen a pencil, lead-breaking rate is low, the thickness of a lead sharpened is moderate, the pencil utilization ratio is enhanced, and the blade can automatically stop sharpening when the pencil finshes sharpening.
Description
The utility model is that a kind of lead-breaking rate is extremely low, pencil utilization ratio height and have the pencil volume and cut the student that the blade that puts in place stops the penetration of a cutting tool function automatically and use pencil sharpener.
Existing pencil sharpener very easily causes lead for retractable pencil disconnected plumbous (particularly, second grade pupil cuts the skill support to volume and hold badly, firmly irregular, lead-breaking rate is higher) in the roll cutting pencil process; The plumbous taper of the lead for retractable pencil that volume is cut out, frangibility when writing; And, owing to cross the existence cut phenomenon, have greatly pencil not obtain real utilization being reamed by volume in vain unconsciously.
Plumbous sharp frangibility when the purpose of this utility model is intended to solve existing pencil sharpener and easily causes disconnected lead for retractable pencil plumbous, that cut out to write, and easily cause the defective of excessive cutting in the roll cutting pencil process.
The efficient pencil sharpener of lower lead-breaking rate by knife rest, blade and blade fixedly screw three parts form.Wherein, blade and blade fixedly the blade of screw and existing pencil sharpener and blade fixedly screw be as good as.Knife rest is to have done at 3 to improve and form on the basis of existing pencil sharpener knife rest, and the first has increased a cylindrical pen-guiding hole at pencil sharpener bellmouth front end.The about 8mm of this cylindrical pen-guiding hole length, center line and bellmouth central lines, diameter is identical with the standard cylindrical pencil diameter.Its effect is: 1, guarantee when pencil inserts bellmouth not eccentric, prevent the pencil volume cut cause because of pencil is eccentric in the process disconnected plumbous; 2, prevent to cut in the process because of inequality firmly and make the pencil generation radially rock the lead for retractable pencil that fractures at pencil volume.It two is that dress cutter platform with pencil sharpener makes cambered surface into by the plane and adds planar structure, the cambered surface part is installed the Luo hole with the end of a left side near U type groove at blade, after blade installs, because the pressure of screw is installed, the blade left end is close to cambered surface and is upwarped naturally by certain curvature, forming a depth of cut negative gradient along plumbous sharp direction, its high order end upwarps about highly about 0.25mm-0.30mm.Its effect is: 1, cut in the process at pencil volume, more little the closer to the plumbous point place depth of cut, blade is also just more little to the bending power of lead for retractable pencil, thereby has significantly reduced the disconnected lead that the bending of lead for retractable pencil is caused because of blade.2, volume lead for retractable pencil steady quality, smooth surface, the effective length of cutting out is longer, and thickness is moderate, and plumbous point place has the 0.6mm thickness approximately, just in time is fit to write, and it has improved the service efficiency of lead for retractable pencil.It three is to allow knife rest left side wall near the blade high order end.Its effect is that because pencil can not be pushed ahead again, blade stops penetration of a cutting tool, extracts pencil out at this moment and can use, thereby avoided excessive cutting phenomenon when pencil volume is cut lead for retractable pencil and withstood left wall (the thick about 0.6mm of plumbous point can sustain certain pressure).
The utility model has the advantages that: 1, eliminated basically because of irregular, the volume technology of cutting firmly and grasped the disconnected plumbous phenomenon that bad, blade causes the factors such as bending of lead for retractable pencil.2, roll up the lead for retractable pencil shape unification of cutting out, steady quality, smooth surface, effective length is longer, and thickness is moderate, and plumbous point place has the 0.6mm thickness approximately, and frangibility just in time is not fit to write.3, pencil sharper well the back blade stop penetration of a cutting tool automatically, need not cut in the process at volume and observe pencil and whether cut, and avoid excessive cutting phenomenon.4, the pencil utilization rate improves greatly.It shows to eliminate and resolves lead, eliminated to cross and cut high these three aspects of lead for retractable pencil service efficiency that phenomenon and volume are cut out.
Below in conjunction with structure chart particular content of the present utility model is described.
Accompanying drawing is the efficient pencil sharpener structural representation of lower lead-breaking rate.
As shown in drawings, the efficient pencil sharpener of lower lead-breaking rate by knife rest 1, blade 2, blade fixedly screw 3 form.The pen-rolling hole of knife rest 1 comprises oblique circular cylinder shape pen-guiding hole 4, bellmouth 5 and U-lag 6 three parts, and wherein, pen-guiding hole 4 diameters are 8mm, center line length 8mm; Dress cutter platform is made of cambered surface part 7 and planar section 8, and both smoothly join in the centerline in Luo hole 9, cambered surface radius R=(a
2+ b
2)/2b=288.125mm, a are the distance of the central point in Luo hole 9 to wall inboard, a knife rest left side, about 12mm, b is the distance that the left end peak exceeds than the plane, about about 0.25mm, after blade is installed, be close to cambered surface at the pressure bottom knife left end that screw is installed and upwarp naturally by certain curvature; Blade left end 11 is close in wall inboard, a knife rest left side 10, to realize that pencil sharper well stops penetration of a cutting tool automatically.
Claims (2)
1, the efficient pencil sharpener of a kind of lower lead-breaking rate, it by knife rest 1, blade 2 and blade fixedly screw 3 form.It is characterized in that: the bellmouth front end of knife rest 1 has a cylindrical pen-guiding hole 4, this pen-guiding hole center line and bellmouth central lines; The dress cutter platform of knife rest 1 is that cambered surface 7 adds plane 8 structures, and lonely face portion is installed Luo hole 9 with the end of a left side near U type groove 6 at blade; After blade was installed, the left wall inboard 10 of knife rest 1 was near blade high order end 11, cut plumbous pinnacle when living left wall when the pencil volume, because pencil can not be pushed ahead again, blade stops penetration of a cutting tool automatically.
2, blade 2 as claimed in claim 1 is characterized in that: after blade installed, under the pressure that screw is installed, the blade left end was close to cambered surface and is upwarped naturally by certain curvature, and its high order end upwarps about the about 0.25mm-0.30mm of height anomaly face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94223460 CN2224742Y (en) | 1994-10-06 | 1994-10-06 | high performace pencil sharpener with low lead-breaking rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94223460 CN2224742Y (en) | 1994-10-06 | 1994-10-06 | high performace pencil sharpener with low lead-breaking rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2224742Y true CN2224742Y (en) | 1996-04-17 |
Family
ID=33837153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94223460 Expired - Fee Related CN2224742Y (en) | 1994-10-06 | 1994-10-06 | high performace pencil sharpener with low lead-breaking rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2224742Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110328991A (en) * | 2019-08-13 | 2019-10-15 | 上海友谊卷笔刀有限公司 | A kind of pencil sharpener of core-broken |
-
1994
- 1994-10-06 CN CN 94223460 patent/CN2224742Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110328991A (en) * | 2019-08-13 | 2019-10-15 | 上海友谊卷笔刀有限公司 | A kind of pencil sharpener of core-broken |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |