US 7,100,284 B2Grant
Shaving product
Issue Date:2006-09-05
•21 Claims
•15 Drawing Sheets
Abstract
A razor head has blade members with straight front cutting edges which are mutually parallel and lie in a cutting plane. Imaginary median surfaces of the blade members are continuously curved from the cutting plane, from the cutting edges toward the rear edges. The razor has a handle with a pair of fork arms, the distal ends of which are connected to the head at positions adjacent the respective ends of the head. Each fork arm has a groove allowing pivoting of the distal end about a pivot axis parallel to the head axis. Each groove is filled with a resiliently deformable material which is deformed when a pivoting force is applied to the razor head during shaving and which restores the razor head to a normal position when the force is removed.
Metadata
Assignee
- Knowledge & Merchandising, Inc. Ltd.
Inventor
- William Ashley King
Application Information
Application Number:US 10/732,220
Filing Date:2003-12-11
Priority Date:2003-11-17
Art Unit:3724
Classifications
IPC:
B26B21/00
Patent Drawings (15 sheets)
Description
Background of the Invention
[0001] 1. Field of Invention
[0002] This invention relates to shaving products in general and, in particular, to razor blades, razor heads, which may be disposable, razor handles, and razors.
[0003] 2. Background Art
[0004] Razors having a handle and a disposable head are well known. A razor head will typically have three parallel blade members. The head may be mounted on the handle in such a way that the head rocks relative to the handle.
Summary of Invention
[0005] In one aspect the present invention provides a razor blade which curves continuously away from the cutting edge.
[0006] In another aspect the present invention provides a razor head in which a plurality of blades are clamped between first and second head parts.
[0007] In another aspect the present invention provides a razor handle which has a groove allowing pivoting of the distal end of the handle about an axis transverse to a handle axis.
[0008] In another aspect the invention provides a razor in which a razor head is removably fixed to a forked handle.
[0009] In particular, in one aspect, the invention provides a razor head including a plurality of blade members, each having a straight front cutting edge and a rear edge, the cutting edges being mutually parallel and lying in a cutting plane, each blade member having an outer surface facing toward the cutting plane and an opposite inner surface, with an imaginary median surface mid-way between the outer and inner surfaces, the median surfaces of the blade members being continuously curved in the same sense away from the cutting plane, from the cutting edges toward the rear edges.
[0010] In another aspect the invention provides a razor head comprising at least one blade member having a cutting edge, and a frame defining an opening through which the cutting edge is accessible, the frame including a leading element toward which the cutting edge are directed and a trailing element opposite the leading element, wherein at least one of the leading and trailing elements has a longitudinal gutter in which a lubricating liquid accumulates during shaving.
[0011] In another aspect the invention provides a razor handle for a razor including a razor head having at least one blade member with a cutting edge extending along a head axis transverse to a handle axis, the razor handle having a front end portion, the distal end of which is connectable or connected to the head, the front end portion having a groove allowing pivoting of the distal end about a pivot axis parallel to the head axis, the groove containing a resiliently deformable material which is deformed when a pivoting force is applied to the distal end by the razor head during shaving and which restores the distal end to a normal position when the force is removed.
[0012] In another aspect the invention provides a razor comprising a handle and a razor head having at least one blade member with a cutting edge extending along a head axis transverse to a handle axis, the handle having a forked front end portion with a pair of fork arms, the distal ends of which are connected to the head at positions adjacent the respective ends of the head, the head having undercut apertures in rear abutment surfaces, the distal ends of the fork arms having detent elements projecting forwardly from front abutment surfaces, the front and rear abutment surfaces abutting against one another and the detent elements engaging in the undercut apertures in such a manner that the head is fixed relative to the distal ends of the fork arms, the distal ends being movable toward one another to disengage the detent elements from the undercut apertures and allow the head to be removed from the handle, the distal ends being pivotable about an axis parallel to the head axis when a pivoting force is applied to the razor head during shaving.
[0013] In another aspect the invention provides a razor comprising an elongate handle and a head connected to the handle, the head including at least one blade member having a cutting edge, the head defining a shaving surface toward which the cutting edge is directed and a reverse surface opposite the shaving surface, the handle having a front end portion connected to the head between the shaving surface and the reverse surface, the handle being angled away from a plane tangential to the shaving surface.
[0014] Preferred and optional features are set out in the following description and in the claims.
Brief Description of the Drawings
[0015] FIG. 1 shows a razor, viewed from the bottom or underside, which is the side facing the skin during shaving;
[0016] FIG. 2 is a perspective view of the razor, viewed from above, with the razor head and handle separated;
[0017] FIG. 3 is a side view of the razor;
[0018] FIG. 4 is an enlarged section taken on line IV—IV in FIG. 3 ;
[0019] FIG. 5 is an exploded perspective view of the razor head, viewed from the underside;
[0020] FIG. 6 is an enlarged cross-section through the razor head;
[0021] FIG. 7 is a bottom view of the blade members and flexible blade separators;
[0022] FIG. 8 is an enlarged section taken on line VIII—VIII in FIG. 7 ;
[0023] FIG. 9 is a perspective view corresponding to FIG. 7 ;
[0024] FIG. 10 is an enlarged side view of the cutting edge portion of one of the blade members;
[0025] FIG. 11 is a cross-section through one of the blade members;
[0026] FIG. 12 is a perspective view of a first, lower part of the razor head, seen from below;
[0027] FIG. 13 is a bottom plan view of the first part;
[0028] FIG. 14 is an enlarged section taken on line XIV—XIV in FIG. 13 ;
[0029] FIG. 15 is a bottom plan view of a second, upper part of the razor head;
[0030] FIG. 16 is an enlarged section taken on line XVI—XVI in FIG. 15 ;
[0031] FIG. 17 is an end view of the second part;
[0032] FIG. 18 is a section taken on line XVIII—XVIII in FIG. 17 ;
[0033] FIG. 19 is a side view of the razor;
[0034] FIG. 20 is a section taken on line XX—XX in FIG. 19 ;
[0035] FIG. 21 is an enlarged view of the detail XXI indicated in FIG. 20 ;
[0036] FIG. 22 is a view similar to FIG. 20 , but with detent elements disengaged from undercut apertures in the razor head;
[0037] FIG. 23 is an enlarged view of the detail XXIII—XXIII indicated in FIG. 22 ;
[0038] FIG. 24 is a view similar to FIGS. 20 and 22 , but with the disengaged detents withdrawn from the undercut apertures;
[0039] FIG. 25 is an enlarged view of the detail XXV—XXV indicated in FIG. 24 ;
[0040] FIG. 26 is a perspective view of the forked end portion of the handle, seen from below, with grooved parts uncovered;
[0041] FIG. 27 is an enlarged view of the detail XXVII—XXVII indicated in FIG. 26 ;
[0042] FIG. 28 is a cross-section through the razor head and one fork mm of the handle;
[0043] FIG. 29 is a side view corresponding to FIG. 28 , but with the head pivoted to its maximum practical extent; and
[0044] FIGS. 30 to 32 are similar to FIGS. 26 to 28 , respectively, but show another embodiment of the razor handle.
Detailed Description of the Invention
[0045] The drawings illustrate the presently preferred embodiment of a razor. It is to be noted that the drawings are not to scale.
[0046] The razor comprises a forked handle 1 and a replaceable head 2. The handle 1, which is used to draw the head across the user's skin, has a gently curved shank 3, the front end of which merges into the forked front end portion 4 which is generally U shaped and has a pair of fork arms 6 which are mirror-symmetrical with respect to an imaginary plane longitudinally bisecting the shank 3. By squeezing the arms 6 it is possible to push them inwards slightly; in FIG. 1 the normal position of one arm 6 is shown in broken line at the left-hand side, whereas an inwardly pushed position of both of the arms 6 is shown in solid line. The arms 6 are resiliently flexible, so that they naturally return to their normal position.
[0047] The razor head 2 includes three blade members 7 which are identical to each other and each made of a single sheet of material, which may be a metallic, ceramic, or metalloceramic material. Alternatively, a blade member may be made of separate parts joined together, e.g. a front part containing a cutting edge and a rear part connected to the front part. Each blade member 7 has a straight front cutting edge 8 and a rear edge parallel to it. Apart from the sharpened portion 11 with the cutting edge 8, the blade member 7 is of constant thickness in the embodiment illustrated.
[0048] The cutting edges 8 lie in a cutting plane 12 and are mutually parallel in the embodiment illustrated. Each blade member 7 has a convex outer surface 13 facing towards the cutting plane 12 and an opposite concave inner surface 14. An imaginary median surface 16 (FIG. 10 ), mid-way between the outer and inner surfaces 13, 14, curves away from the cutting plane 12 and is in the form of a segment of a circular cylinder in the embodiment illustrated. The angle a between the median surface 16 and the cutting plane 12, at the cutting edge 8, is preferably at least 15° and preferably at most 30°, being for example 20°. The segment angle β is preferably in the range from 50° to 75°, more preferably 60° to 70°.
[0049] The blade members 7 are identically curved and are arranged parallel to one another. This arrangement facilitates the passage of waste material (hair follicles and shaving lotion) through the head and can prevent excess build up of waste which would tend to raise the cutting edges 8 from the shaving surface. To enhance this effect, the spacing between the rear edges 9 could be made greater than that between the cutting edges 8. The curvature of the blade members allows the sharpened portions 11 to be offered up to the shaving surface at an optimum angle, while the blade members direct the waste material away from the shaving surface. The curved profile of the blade member enhances its longitudinal strength and minimises deformation of the cutting edge during use.
[0050] The blade members 7 are held between a first, lower head part 17 (which is adjacent the skin during shaving) and a second, upper head part 18. The head parts 17, 18 have complimentary curved blade-end supports 19, 21 respectively, which clamp respective end portions of the blade members 7 between them.
[0051] The first head part 17 is in the form of a frame defining an opening 22 through which the cutting edges 8 of the blade members 7 are accessible. The frame includes a leading element 23 in the form of a hair erection strip which is provided with a frictional surface 24 having a higher coefficient of friction than the remaining surfaces of the frame and tending to pull the skin taut and erecting the hair follicles in its path as the razor head 2 is drawn across the skin during shaving. Both the leading element 23 of the frame and the trailing element 26 have respective gutters 27, 28 allowing for the collection and redistribution of pre-applied shaving solution (a lubricating liquid), in order to provide an accumulated shaving solution cushion allowing constant lubrication of the shaving surface during use. A plurality of ducts 29 communicate between the gutter 28 and the opening 22, keeping the gutter 28 well supplied with shaving solution during shaving.
[0052] The frame also includes lateral elements in the form of raised skids 31, which assist in flattening the shaving surface during use. As best seen in FIG. 6 , the plane of the shaving surface 32 tangential to the frame-forming elements 23, 26, 31 lies beyond the cutting plane 12 with respect to the blade members 7, thereby assisting in correct location of the cutting edges 8 in relation to the shaving surface. As best seen in FIG. 3 , the elongate handle 1 is angled away from the plane of the shaving surface 32, the front end portion 4 curving away from that plane. For example, the angle between the median longitudinal axis of the shaft 3 and the shaving surface 32 may be in the range from 30° to 50°, in particular about 40°. This helps the user to present the razor head 2 to the skin. In combination with the forked front end portion 4, this is particularly convenient in use.
[0053] The second head part 18 is in the form of a frame having front and rear members 33, 34 and side members 36. Bridging members 37, 38 extend between the front and rear members 33, 34. The middle bridging members 38 and the side members 36 carry resiliently flexible blade supports 39 which maintain a constant spacing between the blade members 7 and minimise deformation of the blade members during shaving. Each flexible support 39 is carried by a relatively rigid pin 40, this structure being produced by two-shot molding, for example. Both head parts 17, 18 also include relatively rigid blade supports 41.
[0054] Preferably, each of the first and second head parts 17, 18 is constituted by a single integrally molded part, which may be produced by one-shot molding, two-shot molding, or multi-shot molding. However, as shown in the drawings, it is possible for the hair erection strip 23 to be a separate piece. In another embodiment, the two head parts 17, 18 may both be constituted by a single integrally molded part so that they are connected by an integral hinge in the manner of a clam shell. Suitable materials for the construction of the head parts are thermoplastic elastomers (such as those available under the trade mark Santoprene). The head parts 17, 18 are bonded together by ultrasonic welding, for example.
[0055] The rear end of each side member 36 of the second part 18 of the razor head 2 has an undercut aperture 42 in a planar rear abutment surface 43. The distal ends of the fork arms 6 have detent elements 44 projecting forwardly from front abutment surfaces 46, which are also planar. Each detent element 44 has a shoulder 47 which engages against an undercut surface 48 in the aperture 42, while the front and rear abutment surfaces 43, 46 abut against one another; in this way the razor head 2 is fixed relative to the distal ends of the fork arms 6. This situation is illustrated in FIGS. 19 to 21 .
[0056] In order to release the razor head 2 from the handle 1, the fork arms 6 are first squeezed towards each other, so that the shoulders 48 of the detent elements 44 are disengaged from the undercut surfaces 48 inside the apertures 42, as shown in FIGS. 22 and 23 . Then the detent elements 44 are withdrawn from the undercut apertures 42, as shown in FIGS. 24 and 25 .
[0057] Although the razor head 2 is fixed in relation to the distal ends of the fork arms 6, it is desirable for the head to be able to pivot relative to the shank 3 about an axis parallel to the cutting edges 8 when a pivoting force is applied to the razor head during shaving. For this purpose, each fork arm 6 has a transverse groove 49, which leaves an integral hinge 51. The grooves 49 are mutually aligned on the same side of the forked end portion 4 of the handle 1. The arm portion 52 including the groove 49 and the detent element 44 may be integral with the remainder of the fork arm 6 or (as shown in FIG. 28 ) may be a separate part having a stub 53 fixed in the remaining part of the fork arm 6.
[0058] The part containing the groove 49 is encased in a resiliently deformable material 54 (such as a thermoplastic elastomer) which adheres to the surfaces of the flexible part. As can be seen from FIG. 28 , for example, the material 54 defines part of the front abutment surface 46. The resiliently deformable material in the groove 49 is stretched when a pivoting force is applied to the razor head 2 during shaving (allowing the groove 49 to open and the razor head 2 to pivot) and restores the razor head 2 to its normal position when the force is removed.
[0059] The groove 49 occupies approximately ¾ to ⅘ of the depth of the arm portion 52 and has a front wall 56 approximately parallel with the abutment surface 46, a rear wall 57 sloping away from the front wall 56, and a rounded base 58. The extensibility of the material 54 is such that the head 2 is pivotable relative to the handle 1, under normal shaving forces, through an angle γ of up to at least 45°, for example, as shown in FIG. 29 , preferably up to 65°.
[0060] The shaft 3 of the handle 1 is provided with a grip area 59, which extends around the shaft 3. The grip area 59 has a plurality of small protuberances 61 to aid gripping. The grip area 59 may be made of a different material from the remainder of the shaft 3 and, in particular, may be softer and may have a higher coefficient friction. The body of the handle 1, including the arms 6, may be made of a resilient deformable material so that the arms 6, as a whole, can be flexed towards each other by squeezing the forked portion 4 between finger and thumb. However, the body of the handle 1 may be made of a relatively rigid material, in which case each fork aim 6 may comprise a relatively flexible distal portion which is fixed to the relatively rigid proximal portion and contains the groove 49. A basic handle molding can be made out of any suitable material, for example thermoplastic elastomer, polypropylene, styrene or styrene-copolymer plastics, cast metal such as aluminum, or composite material such as carbon fiber. A handle made of thermoplastic elastomer could have a grip area made of a softer thermoplastic elastomer (e.g. by two-shot injection molding). A handle produced from carbon fiber may have a grip area made of aluminum or wood, for example.
[0061] In the alternative embodiment illustrated in FIGS. 30 to 32 , the grooves 49 are provided on the upper side of the front end portion 4 of the handle I, so that the resiliently deformable material 54 in each groove 49 undergoes compression when the pivoting force is applied.
[0062] Various modifications may be made within the scope of the invention. For instance, although the razor blade has been described as having three blade members, which is the preferred number, it may be possible to use a single blade member, a pair of blade members, or four or more blade members. The cutting edges may be angled with respect to one another. The blade members may be of variable thickness. The radius of curvature may vary, in particular it may decrease in the direction away from the cutting edge. Instead of curved blade members, it may be possible to use straight blade members or bent blade members. The groove could be provided in a single arm forming a front end portion of the handle. The pivoting of the razor head could be achieved by replacing the grooves in the fork arms by any other convenient form of hinge. The razor head may be permanently fixed to the handle, in which case the blade members may be replaceably arranged or the razor as a whole may be disposable.
Claims
The invention claimed is:
1. A razor head including a plurality of blade members, each having a straight front cutting edge and a rear non-cutting edge, the cutting edges lying in a cutting plane, each blade member having an outer surface facing toward the cutting plane and an opposite inner surface, with an imaginary median surface mid-way between the outer and inner surfaces, the median surfaces of the blade members being continuously curved in the same sense away from the cutting plane, from the cutting edges to the rear edges, the blade members being spaced apart to allow passage of waste material between them from the cutting edges to the rear non-cutting edges, the head including front, rear, and side elements forming a frame defining an opening through which the cutting edges are accessible, the frame having a shaving surface toward which the cutting edges are directed and a reverse surface, opposite the shaving surface, toward which the rear non-cutting edges of the blades are directed, the opening extending from the shaving surface to the reverse surface.
2. A razor head as claimed in claim 1, wherein the angle between each median surface and the cutting plane, at the cutting edge, is at least 15°.
3. A razor head as claimed in claim 1, wherein each median surface is a segment of a cylinder.
4. A razor head as claimed in claim 3, wherein the cylinder is a circular cylinder.
5. A razor head as claimed in claim 4, wherein the angle of each median surface segment of a cylinder is a segment angle and is in the range from 60° to 75°.
6. A razor head as claimed in claim 1, wherein the cutting edges are mutually parallel.
7. A razor head as claimed in claim 6, wherein the spacing between the rear edges of the blade members is at least as great as the spacing between the cutting edges.
8. A razor head as claimed in claim 1, wherein at least one of the blade members is made of a single sheet of material.
9. A razor head as claimed in claim 8, wherein the material is selected from the group consisting of metallic material, ceramic material, and metalloceramic material.
10. A razor head including a plurality of blade members, each having a straight front cutting edge and a rear non-cutting edge, the cutting edges lying in a cutting plane, each blade member having an outer surface facing toward the cutting plane and an opposite inner surface, with an imaginary median surface mid-way between the outer and inner surfaces, the median surfaces of the blade members being continuously curved in the same sense away from the cutting plane, from the cutting edges to the rear non-cutting edges, the blade members being spaced apart to allow passage of waste material between them from the cutting edges to the rear non-cutting edges, the razor head further comprising a first head part and a second head part, between which the ends of the blade members are held, wherein the first head part constitutes a frame defining an opening through which the cutting edges are accessible, the frame having a shaving surface toward which the cutting edges are directed and a reverse surface, opposite the shaving surface, toward which the rear non-cutting edges of the blades are directed, the opening extending from the shaving surface to the reverse surface, the frame including a leading element toward which the cutting edges are directed, a trailing element opposite the leading element, and lateral elements.
11. A razor head as claimed in claim 10, wherein the first and second head parts have curved blade-end supports which clamp respective end portions of the blade members between them.
12. A razor head as claimed in claim 10, wherein a plane tangential to the said elements lies beyond the cutting plane with respect to the blade members, and defines the sharing surface.
13. A razor head as claimed in claim 10, wherein at least one of the leading and trailing elements has a longitudinal gutter.
14. A razor head as claimed in claim 10, wherein the trailing element has a longitudinal gutter and ducts communicating between the gutter and the opening defined by the frame of the first head part.
15. A razor head as claimed in claim 10, wherein the leading element has a frictional surface with a higher coefficient of friction than the remaining surfaces of the frame.
16. A razor head as claimed in claim 10, wherein the second head part has flexible blade supports which bear against the blade members.
17. A razor head as claimed in claim 16, wherein the second head part is in the form of a frame having front and rear members and side members.
18. A razor head as claimed in claim 17, wherein the second head part further comprises bridging members extending between the front and rear members.
19. A razor head as claimed in claim 17, wherein the rear ends of the side members have apertures for receiving corresponding end parts of a forked handle.
20. A razor head as claimed in claim 16, wherein each of the first and second head part is constituted by a single integrally molded part.
21. A razor head as claimed in claim 16, wherein at least one of the first and second head parts comprises a thermoplastic elastomer.
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