CN1003635B - Cutting head of dry type electric razor with cutting metal thin sheet crooked due to holding - Google Patents
Cutting head of dry type electric razor with cutting metal thin sheet crooked due to holding Download PDFInfo
- Publication number
- CN1003635B CN1003635B CN85102149.2A CN85102149A CN1003635B CN 1003635 B CN1003635 B CN 1003635B CN 85102149 A CN85102149 A CN 85102149A CN 1003635 B CN1003635 B CN 1003635B
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- Prior art keywords
- guard
- shave
- cutting
- cutting blade
- curve
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Abstract
The present invention relates to a cutting head of a vibration type and dry type electric shaver. The cutting head comprises a cutting sheet metal (5) which can be bent because of clamping, and a cutting knife (7) which moves along the cut off sheet metal (5), wherein the knife edge (9) of the cutting knife (7) is in an arc shape; the cutting sheet metal (5) is clamped beside the end (6) of the cutting region of the cutting knife (7); in addition, in the clamping region, the tangent lines of the bent parts of the sheet metal mutually form an acute angle. In the whole cutting region, the curvature of the knife edge (9) of the cutting knife composed of thin sheets adapts to the curvature of the sheet metal (5) which is automatically formed by clamping the cutting sheet metal on the whole.
Description
The present invention is relevant with a kind of shave head of dry type electric razor.This shave head has because of the crooked guard of clamping and knife edge part and is same arc, is pasting the reciprocating cutting blade of guard, guard be clamped in the shave head shave face termination near, and two tangent lines acute angle that is intersecting each other of clamp area guard curve.
Usually, the shave head in circular section or half elliptic cross section is arranged is known (DE-PS 932172) to the shave mask.Guard covers whole shave head.Usually, the both sides at shave head center have two to be banded contact-making surface.When the arc that reduces guard half through the time, this two ribbons contact-making surface will dwindle greatly.In this case, cutting blade has only the interior side contacts of a very narrow band and crooked guard probably.Not such, the cartouche of bottom is too narrow, and the gap between cutting blade and the guard is too big.It is bigger particularly to leave the aduncate regions wear of guard at cutting blade.
Patent documentation DE-OS 2139419 proposes to increase the pressure of power sheet to guard, so that improve the applying degree of cutting blade and guard in this way.Yet along with the position that the increase of pressure is fitted well, the wearing and tearing of part of just being engaged in shave are just big more, and the motor power (output) that needs has also increased.
Patent documentation DE-PS 1056000 introduced a kind of on the edge of guard the mode of clamping guard, it is to make each bar gripping edge of guard be inclination mutually slightly on the curved surfaces of guard.Cutting blade also is a plate sheet, and is held curvedly, utilizes its elasticity that it is pressed on the lower surface of guard.Do not having under the situation of load, these two kinds all is that contact-making surface between laminar cutting blade and the guard is bigger, but the effect of shave can not be satisfactory, because cutting blade local deformation under pressure in use.
A kind of laminar cutting blade has also been described among the patent documentation AT-PS 392502.But, the laminar cutting blade of this mushroom-shaped easy deformation more when the shave head is close to skin.This razor also only just can have big contact area between laminar guard and the cutting blade under the uncharge situation.
No matter the objective of the invention is, be under the little situation of pressure, still under the very narrow situation of shave head, perhaps in use, the contact-making surface between cutting blade and the guard increased.
According to the present invention, above-mentioned purpose is that camber line by making laminated type cutting blade blade pastes mutually with the camber line of guard on whole shave face and reaches, and forms automatically because clamp guard and the camber line of guard is fully.This method is with known prior art is different so far, because up to now, the profile of cutting blade is to make the sort of shape of stipulating for guard artificially.On the contrary, according to the present invention, the profile of cutting blade will meet the free bend shape that guard presents because of clamping.
Like this, guard contacts on whole shave face with cutting blade basically.There is not discontiguous zone.If the shave cutlery of laminated type cutting blade has the profile (y=C.cosh x/c) of hyperbolic cosine curve, and the edge of guard tangentially is clamped on the profile of hyperbolic cosine curve, and this is the desired arc shape of laminated power type sheet.Main design is not force the profile of guard to adapt to the shape of cutting blade, on the contrary, is to make the profile of the net cutting blade of wearing into shape deacclimatize the shape that guard forms because of clamping.This shave head only applies less pressure to cutting blade in use, thereby only needs less transmission power, because frictional force is very little.And transmission power only is used for shave and does not produce heat.In addition, the stimulation of skin has been reduced, in general, the effect of shaving can obtain substantial improvement.The smoothness that shave comes out is higher, has shortened the shave time, and can shave the beard of most neck.
According to another embodiment of the invention, be when the ultimate range 2b between two clamp area is decided to be 2 * 6 millimeters, the value of constant C approximates 3.5 millimeters greatly.The C value depends on the size of guard.
According to still a further embodiment, be to use function
f
1(c)=c+h and
f
2（c）＝c.coshb/c，
Intersection point determine constant c.H represents on the appearance curve of the guard that is held in the formula, and the height between the peak of clamp area and guard, b are represented two distances between the clamp area half.
At last, according to another embodiment of the invention, if in clamp area one grip block is arranged, this grip block is being connected with the guard that is held from the outside near nip points, so, it is the most favourable that the α angle that the line between this grip block and two clamp area is formed is approximately equal to sinh b/c.
For example the present invention is described more fully with reference to the accompanying drawings.In the accompanying drawings:
Fig. 1 is the longitudinal sectional drawing that has the oscillatory type shaving system cutting blade of the curved shave sword of hyperbolic cosine and cover the guard above it;
Fig. 2 and Fig. 3 are the graphs of a relation with the selected constant C of diagram method.
Fig. 1 represents the guard 5 and the laminar cutting blade of a slice that are clamped in clamp area 1, but has only represented a slice cutting blade in the drawings.Clamping device 2 is arranged on the clamp area 1, and this device has from the outside the fixedly positioning clamping face 4 of guard.Guard is clamped near the end, cutting blade shave district 6.The laminated type cutting blade has the shave sword 9 of arc, and this shave sword 9 represents with section that in the drawings its profile accurately or is approx determined (represented curvilinear motion is not drawn in proportion among Fig. 1) according to formula y=c.cosh x/c.In the Cartesian coordinates in Fig. 1, X represents the coordinate of cutting blade 7 width sizes, and y represents that the each point corresponding with it leaves the distance of reference axis.In order to determine the value of constant C, should consider the various given parameter of guard.The firsthand information of determining the C value of an existing guard is its characteristic parameter: material, length, width, thickness and the hole on it.Hyperbolic cosine contact of a curve (Fig. 2) in the gripping edge 8 of this guard and the distance of 2 * b.Then, making this guard curve it according to the structure of guard and size is intrinsic natural curve.This curve can be measured in the substrate of clamp area 1 and the height h between the peak 11.So just can obtain the shave sword 9 of cutting blade according to this natural curve.The curve available projections replica method of this shave sword obtains.Know that the natural curve of guard roughly is the shape of hyperbolic cosine curve curve.Therefore, the profile of shave sword just is roughly the hyperbolic cosine curve.
Can be in the following method by half of cutting blade width, promptly the value of b (perhaps the distance between two clamp area 1 half) and the height h of curve try to achieve constant c:
When x=0, the surplus * functional value of hyperbolic is 1,
So during x=0, y=c,
And when x=b, can get
y＝C+h＝C.cosh b/c。
This is the equation of a definite C, can obtain C from this equation.So, just can determine the C value with simple diagram method according to following two functions:
f
1(c)=c+h and
f
2(c)=C.cosh b/c; Can obtain a specific c value from the intersection point of these two curves.
According to test of many times with calculate the profile of determined guard 5 when the clamping, the profile of the shave sword 9 of selected cutting blade 7.When determining the profile of cutting blade 7 in this way, find that even if do not apply the such big pressure that can cause guard 5 distortion, the contact area of cutting blade and guard 5 inner surfaces is also very big.Therefore, in fact cutting blade 7 does not apply deformation force to guard 5.
The structure that this shave head is particularly suitable for being rather narrow.The effect of this shave is rather similar with the shave with razor, promptly only needs shaving once just can shave fully only.The process of this shave and shave sensation is different from the shave process and the shave sensation of the very big various shave heads of surface area fully, because the sort of shave has only limited contact-making surface between the cutting blade of rigidity and guard.
The shave head that is rather narrow can be understood as the size of shave head along X-axis, for example, is about 2 * 6 millimeters.Constant C is the initial point of hyperbolic cosine curve and the distance between the saddle point 11, for example, is 3.5 millimeters (in formula y=C.cosh x/c, y represents that all the time each point is from the distance of X-axis on the hyperbolic cosine curve) to the data of selected guard here.α angle between the imaginary line 13 between the gripper edge of guard and two clamp area is approximately sinh b/c.In an embodiment, the α angle approximately is 71.23 °.
Claims (3)
1, a kind of have because of the crooked guard of clamping, be same therewith curve with the shave sword, pasting the shave head of the oscillatory type dry type electric razor of the reciprocating cutting blade of guard, guard is clamped near the end in cutting blade shave district, and at clamping zone, two tangent lines of guard curve intersect each other and acutangulate, it is characterized in that, the shave sword (9) of laminated type cutting blade (7) and the curve of guard (5) are hyperbolic cosine curve (y=C.cosh x/c), y represents that each point on the hyperbolic cosine curve leaves the distance of X-axis in the formula, X represents the rectilinear coordinates of cutting blade width size, C represents a constant, the guard edge tangentially is clamped on the profile of hyperbolic cosine curve, and constant C is by function f
1(c)=c+h and f
2(c)=and the intersection point of Ccosh b/c determines, and h is the height of guard this section curve between the peak (11) of clamp area (1) and guard (5) of being held in the formula, and b is the distance half between two clamp area (1).
2, according to the described shave head of claim 1, it is characterized in that the ultimate range between the clamp area (1) is about 2 * 6 millimeters, the value of constant C is 3.5 millimeters.
3, according to claim 1 or 2 described shave heads, it is characterized in that clamp area (1) has grip block (4), this grip block is connected with the guard that is held (15) from the outside locating near bite (2), and the α angle that the line between this grip block and two clamp area (1) forms is approximately equal to sinh b/c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85102149.2A CN1003635B (en) | 1985-04-01 | 1985-04-01 | Cutting head of dry type electric razor with cutting metal thin sheet crooked due to holding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85102149.2A CN1003635B (en) | 1985-04-01 | 1985-04-01 | Cutting head of dry type electric razor with cutting metal thin sheet crooked due to holding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85102149A CN85102149A (en) | 1987-01-10 |
| CN1003635B true CN1003635B (en) | 1989-03-22 |
Family
ID=4792294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85102149.2A Expired CN1003635B (en) | 1985-04-01 | 1985-04-01 | Cutting head of dry type electric razor with cutting metal thin sheet crooked due to holding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003635B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878641B (en) * | 2003-11-11 | 2010-05-26 | 松下电工株式会社 | Electric razor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7572432B2 (en) * | 2004-04-13 | 2009-08-11 | General Electric Company | Method and article for producing hydrogen gas |
-
1985
- 1985-04-01 CN CN85102149.2A patent/CN1003635B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878641B (en) * | 2003-11-11 | 2010-05-26 | 松下电工株式会社 | Electric razor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85102149A (en) | 1987-01-10 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| 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 |