CN1213334A - safety razor - Google Patents

Abstract

A safety razor blade unit having at least one blade with a cutting edge which is moved across the surface of the skin being shaved by a handle to which the blade unit is attached. The blade unit may be mounted detachably on the handle. The razor blade unit has a guard which defines a surface for contacting the skin in front of the blade and a cap for contacting the skin behind the blade. The skin engaging portion of the guard has spaced projections extending upwardly from a base and formed of a resiliently flexible material. At least some of the projections have cross-sections with concave sides defining a recess opening.

Description

Safety razor

The present invention relates to repair and shave device and relevant with a kind of safety razor blades assembly, this blade assembly has at least one blade that a cutting edge is arranged, and this cutting edge crosses by the surface of shaving skin by means of a handle and moves, and blade assembly just is contained on this handle.Blade assembly can removably be contained on the handle, so that blade assembly is changed by a new blade assembly can be reduced to unsafty level in the sharpness of blade the time; Perhaps under the situation that blade has abandoned whole razor during rust, can for good and all be contained on the handle planning.Razor blade assembly generally includes a backplate and a cover plate, backplate defines one and is used for the surface that contacts with the skin in blade the place ahead, and cover plate is used for contacting with the skin at blade rear, and cover plate and backplate promptly all play an important role when determining blade with respect to the parameter of the orientation of skin and position when shaving repairing setting up so-called " repair and shave geometry ".The present invention be more particularly directed to the backplate and/or the cover plate of razor blade assembly.

Know,, provide a kind of and backplate or cover plate skin engagement, its surfac topography to be intended to produce happy sense of touch when shaving repairing for example as described in US-A-5191712.

The object of the present invention is to provide a kind of improved surface texture of cover plate or backplate, and according to this purpose, the invention belongs to a kind of safety razor blades assembly, it has the member of at least one elongated blade and and skin engagement, this component limit one be used for the surface that contacts with skin when shaving repairing, above-mentioned surface is limited by the spaced-apart projection that protrudes upward from a base plate and is formed by the material of elastically deformable, thus, the upper end of projection can deflection under the effect of repairing power suffered when shaving, at least some projection that has with the cross section of recessed side will so be orientated, so that the dimple that is formed by recessed side crosses the direction that skin moves and opens wide repairing along the major part of dimple width towards blade at least when shaving.

Relatively more suitable is that the concave surface of projection crosses the direction that skin surface moves towards blade assembly, though they also can tilt with respect to this direction with an angle that is to the maximum about 45 °.

Projection has various shape of cross sections, but proper be concave-convex, particularly have the circular arc of 1/4～3/4 circumferential scope of whole circle, preferably semi arch.Another kind of cross-sectional form has an arc mid portion, and its both sides are extended by straight line portion, as the shape of a letter U.

Proper is, projection is by a row or for example 3 rows or 4 row's arrangements of more rows, they extend along parallel with blade usually base plate, whenever drain into rare ten projections, and to general length for example floor length be about the blade assembly of 30mm, every row has nearly about 40 projection, proper is, projection is in the scope of the height above the base plate at 0.38mm to 1.5mm, be preferably about 0.75mm, (what measure between concave surface and the convex surface) thickness is in the scope of 0.10mm to 0.50mm, be preferably about 0.17mm, the ratio of the base plate thickness of projection (thickness of projection and back plate connections) and height preferably is about 1: 4.4 in 1: 1 to 1: 15 scope.

Be made into circular arc or comprise that external diameter can preferably be about 0.75mm under the situation of concavo-convex projection of a part of this shape in the scope of 0.3mm to 3.0mm at its cross section, internal diameter can preferably be about 0.4mm in the scope of 0.1mm to 2.5mm.Internal diameter and external diameter can strengthen towards the direction of leaving base plate, so that projection makes progress into is horn-like, perhaps internal diameter and external diameter can reduce along the direction of leaving base plate, so that projection tilts towards its free end, but under any situation, thickness all remains unchanged along the height of projection.Thickness also can be for example since internal diameter strengthen gradually and/or external diameter reduces and along the height change of projection gradually along the direction of leaving base plate along the direction of leaving base plate.

Along repairing the vertical direction of direction that moves when shaving with blade assembly on skin, the spacing between the projection preferably is at least 0.1mm and is not more than the width of a projection on above-mentioned direction, and most preferred spacing is about 0.25mm.If desired, adjacent projection can be with being connected to each other with the molded integratedly film of projection.

Employing is according to razor blade assembly of the present invention, and the skin contact sheet of skin engagement member is in the face of for example because projection is run into very sensitivity of local power that hair produces.The concave surface of projection can play a part hair is concentrated in its dimple, so that the interaction of reinforcement and projection.In addition, these faces also can be used for drawing and collect moisture from skin and are running into hair subsequently and this moisture is being discharged during with its interaction then.Have, the non-linear force flexural property of concavo-convex projection can be beneficial when itself and hair interact again.

Illustrate in greater detail some embodiment of the present invention below with reference to accompanying drawing, in the accompanying drawings:

Fig. 1 is the perspective view according to the skin engagement member of blade assembly of the present invention;

Fig. 2 is the vertical view of skin engagement member;

Fig. 3 cuts open the cutaway view of getting for the A-A line along Fig. 2;

Figure 4 and 5 are the front elevation and the side view of skin engagement member;

Fig. 6 shows with perspective view and the skin engagement member is housed to form the blade assembly of protective surface;

Fig. 7 (a) to 7 (f) be vertical view, show other shape of the projection of skin engagement member; And

Fig. 8 (a) is the cutaway view of other form of expression projection to 8 (f).

Skin engagement member 1 intention shown in Fig. 1 to Fig. 5 forms a cover plate in having the razor blade assembly of one or more elongated blades, or more appropriate, forms a protective surface.Fig. 6 shows and the skin engagement member is housed to limit this blade assembly of protective surface.Though the blade of assembly removes, should be appreciated that they will be positioned at the framework 2 of assembly, so that their cutting edge is parallel to the leading edge of skin engagement member 1.Member 1 usefulness airframe material is molded in aggregates.It comprises a rectangular base plate 3, protrudes upward the projection 4 with semi arch cross section from it, and the concave surface of these projections is being repaiied the direction that moves when shaving towards the skin engagement member on skin.Projection is vertically arranged along four and is put, and projection separates to moderate distance each row, this distance is not more than the width of projection along row's direction, and alternate vertical row's the projection segment distance that longitudinally staggers, half of the center to center pitch P that this distance is a neighboring projection among the same row, row's projection is longitudinally overlapping continuously.

Each size is as follows:

Floor length: 30mm

Baseplate width: 2.5mm

The height of projection is 0.38mm-1.5mm, is preferably 0.75mm

The external diameter of projection: 0.3mm-3.0mm is preferably 0.75mm

The internal diameter of projection: 0.1mm-2.5mm is preferably 0.4mm

The thickness of projection: 0.1mm-0.5mm, preferably 0.17mm

The spacing of projection (in each row): the 0.1mm-external diameter is preferably 0.25mm

Every row's projection: be at least 10 and as shown be 29.

Shown in Fig. 1～5 and more clearly in the specific embodiments shown in Fig. 8 (a), projection 4 is upright, and along it constant thickness is arranged highly.But they also can have certain angle or inclination, and particularly in the preferred case, forward and/or to laterally inclined, simultaneously, thickness can be along the height change of projection.For projection, it is not essential having described orientation and half-circle-arc shape, at Fig. 7 (a) some other acceptable shape and orientation has been shown to 7 (f).According to Fig. 7 (a), projection has the shape of circular arc, and its circumferential scope can reach 3/4 of full circle, and the edge of projection is positioned on separately the sagittal plane.The shape of the projection of Fig. 7 (b) is a circular arc, and the circumferential scope of its convex surface is 1/4 of a full circle, and its edge be positioned at repair the common plane that moving direction is vertical when shaving on.In Fig. 7 (c), the U-shaped projection has been shown, has extended straight line portion from wherein semicircle mid portion.Projection shown in Fig. 7 (d) has the shape identical with projection 4 in Fig. 1～5, but the orientation of projection on base plate will make its concave surface tilt with an about angle of 45 ° and forward direction.But, the same with all embodiment, the dimple that is limited by concave surface still opens wide on the major part of dimple width along direction forward.Fig. 7 (e) shows the improvement shape of the projection of Fig. 7 (d), and the edge of each projection is arranged to be arranged in the plane vertical with direction forward.Fig. 7 (f) shows the distortion of Fig. 7 (c), and this projection has a circular arc mid portion, and it defines one 90 ° sweep and extends straight line portion from here.The above-mentioned size that comprises the height of inside and outside diameter and projection and thickness may be used to have Fig. 7 (a) to the skin engagement member of projection shown in 7 (f).

As mentioned above, the thickness of projection 4 can be along its height change.Fig. 8 (b), 8 (c) and 8 (d) show the example of thickness towards the projection of its upper end minimizing.According to Fig. 8 (b), it can reach by leaving the internal diameter that base plate increases gradually, and in Fig. 8 (c), then reaches by leaving the external diameter that base plate progressively reduces.In Fig. 8 (d), internal diameter leaves base plate and strengthens, and external diameter leaves base plate and reduces.Thickness is remained unchanged along the height of projection, and change diameter recessed and the protrusion surface.Like this, Fig. 8 (e) shows a kind of projection, and it is because internal diameter and external diameter reduce and tilt towards its free end, and Fig. 8 (f) shows a kind of projection, and this projection is because the increasing of its internal diameter and external diameter and towards its free end flue.Fig. 8 (b) is to the embodiment preferably interior manufacturing of the size range of defined in the above all of Fig. 8 (f).Under the situation that thickness changes, the thickness of the free upper limb of projection preferably is about 0.17mm, and when external diameter changed, the maximum of external diameter was preferably about 0.75mm.

In certain embodiments of the present invention, more advantageously with projection arrangement Cheng Yiqi concave surface towards crossing side that skin moves when shaving in the opposite direction repairing with blade assembly, for example before being contained in the skin contact member on the blade assembly framework, described skin contact member is turned over 180 ° in the plane of himself.

In any one special embodiment, all projections can be made same shape, size and orientation aptly, are not the sin qua non but do like this, can be in same embodiment in conjunction with the projection of difformity and/or orientation.Like this, just might have some as among the above-mentioned embodiment, be orientated and with its concave surface forward towards blade assembly in the projection of repairing the direction that moves when shaving, other projection is then conversely towards opposite direction.Yet has other modification.For example do not need projection to be separated with the space, can be with projection being connected to each other with the molded integratedly web of projection and base plate.A kind ofly may be, have row's projection that interconnected web is arranged, be used to limit a continuous vertically thin fin that is interrupted by projection.

The material of skin engagement member has elasticity to a certain degree, and the shape and size of the projection that provided are provided, and still, it is normally suitable to have the hardness that is lower than Shore 90A.

Though obviously can in spirit of the present invention and scope, make various improvement and variation,, the inventor's intention only is limited by the accompanying claims.

Claims (20)

1. A safety razor blade assembly having at least one elongated blade and a skin-engaging member defining a surface for contacting the skin during shaving, said surface being formed by upwardly projecting from a base plate The mutually spaced projections define and are formed of an elastically deformable material whereby the upper ends of the projections are deflectable under forces encountered during shaving, at least some of which have a cross-section with a concave side It is oriented so that the recess formed by the concave side is open along at least a majority of the width of the recess in a direction generally towards the direction of movement of the skin contacting member during shaving. 2. 3. The safety razor blade unit of claim 1, wherein at least a substantial portion of the width of the recess is open in a direction generally toward said direction of movement. 3. A safety razor blade unit as claimed in claim 1 or 2, characterized in that the concave side faces in the direction in which the blade unit moves over the skin during shaving. 4. A safety razor blade unit according to any one of claims 1 to 3, wherein the protrusions are concave-convex in cross-section. 5. The safety razor blade assembly according to claim 4, wherein the cross-section is an arc, and its circumferential range is 1/4 to 3/4 of the entire circle. 6. 3. A safety razor blade unit according to any one of claims 1 to 3, wherein the cross-section of the protrusion has an arcuate portion extended from a substantially rectilinear portion. 7. A safety razor blade assembly as claimed in any one of claims 1 to 6, wherein each of said protrusions has a substantially constant thickness of. 8. A safety razor blade assembly as claimed in any one of claims 1 to 7 wherein the edges of the projections on opposite sides of the recess lie in a plane substantially parallel to the elongate blade. 9. A safety razor blade unit according to any one of claims 1 to 8, wherein the protrusions are arranged in a geometric pattern on the base plate. 10. A safety razor blade unit according to any one of claims 1 to 8, wherein the protrusions are arranged in at least one row extending along the base plate in a direction generally parallel to the elongate blade. 11. The mounting razor blade unit of claim 10 wherein there are at least three rows of protrusions and the protrusions in one row are longitudinally staggered relative to the protrusions of an adjacent row. 12. The safety razor blade unit of claim 11, wherein the protrusions have a dimension that is greater than the spacing between adjacent protrusions as viewed along a row. 13. A safety razor blade assembly as claimed in any one of claims 1 to 12, wherein each pair of adjacent protrusions is connected by an integral web extending upwardly from the base. 14. 11. A safety razor blade unit as claimed in claim 10, 11 or 12, wherein adjacent projections in the same row are interconnected by webs which define an elongated fin interrupted by the projections. 15. A safety razor blade assembly according to any one of the preceding claims, wherein the thickness of the protrusion is substantially constant along the height of the protrusion. 16. A safety razor blade assembly according to any one of the preceding claims, wherein the height of the protrusion above the base plate is in the range of 0.38mm to 1.5mm. 17. A safety razor blade assembly according to any one of the preceding claims, wherein the thickness of the protrusions between the concave side and the convex side is in the range of 0.10mm to 0.5mm. 18. 3. A safety razor blade unit according to any one of the preceding claims, wherein the protrusions have a base plate thickness to height ratio in the range of 1:1 to 1:15. 19. A safety razor blade assembly as claimed in any one of the preceding claims, wherein the protrusions are shaped as substantially semicircular in cross-section. 20. The safety razor blade assembly according to claim 4 or 19, wherein the protrusion has a concave side and a convex side, the concave side has a radius of curvature in the range of 0.1 mm to 2.5 mm, and the convex side has a radius of curvature in the range of 0.1 mm to 2.5 mm. Radius of curvature in the range of 0.3mm to 3.00mm.

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