AU4604601A - Shaving system and method - Google Patents

Description

S&F Ref: 438009D2

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

Name and Address of Applicant: Actual Inventor(s): The Gillette Company Prudential Tower Building Boston Massachusetts 02199-8004 United States of America Domenic Vincent Apprille Jr.

Donald Robert Chaulk Joseph George Fucci Stephen Cabot Metcalf Robert Anthony Trotta Charles Bridgham Worrick III Spruson Ferguson St Martins Tower,Level 31 Market Street Sydney NSW 2000 Shaving System and Method Address for Service: Invention Title: The following statement is a full description of this invention, including the best method of performing it known to me/us:- IP Australia Documents received on: g S8 MAY ZUU1 Batch No: j 5845c SHAVING SYSTEM AND METHOD The invention relates to shaving systems having handles and replaceable cartridges.

Shaving systems often consist of a handle and a replaceable cartridge in which one or more blades are mounted in a plastic housing. After the blades in a cartridge have become dull from use, the cartridge is discarded, and replaced on the handle with a new cartridge. In some shaving systems the blades are resiliently mounted with respect to the cartridge housing and deflect under the force of skin contact during shaving. In some shaving systems the connection of the cartridge to the handle provides a pivotal mounting of the cartridge with respect to the handle so that the cartridge angle adjusts to follow the contours of the surface being shaved. In such systems, the cartridge can be biased toward an at rest position by the action of a spring-biased plunger (a cam follower) carried on the handle against a cam surface on the cartridge housing.

It is the object of the present invention to substantially overcome or at least ameliorate one or more of the disadvantages of the prior art.

*e [I:\DayLib\LIBLL]02300.doc:AVS:caa Accordingly, in a first aspect, the present invention provides a shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein said elongated hand gripping structure has an outwardly directed upper surface and generally opposite thereof an outwardly directed lower surface and wherein said elongated hand gripping structure includes first and second gripping portions, each gripping portion comprising an elastomeric plastic outer gripping layer and a nonelastomeric plastic support layer thereunder having extensions press-fitted into said elongated hand gripping structure, said elastomeric outer gripping layer being molded to said nonelastomeric support layer and 1o overlying a major portion of said nonelastomeric support layer, and wherein one of said gripping portions is positioned in overlying relation to said upper surface of said elongated hand gripping structure and the other gripping portion is positioned in overlying relation to said lower surface of said elongated hand gripping structure, said first and second gripping portions being attachable along inwardly oriented axes to attach to said hand gripping structure, whereby said hand gripping structure is sandwiched between the first and second gripping portions.

a second aspect, the present invention provides a shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein said elongated hand gripping 20 structure includes a gripping portion comprising an elastomeric plastic outer gripping layer and a nonelastomeric plastic support layer thereunder having extensions press-fitted into said elongated hand gripping structure, wherein said elongated hand gripping structure is made of plastics and defines a recess, and wherein a weight is disposed in said recess.

.e [I:\DayLib\LIBLL]02300.doc:AVS:raa In a third aspect, the present invention provides a shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein the elongated hand gripping structure includes an elongated handle portion of plastics material, wherein said elongated handle portion defines a weight receiving region, a metal weight disposed in said weight receiving region, and wherein said elongated handle portion comprises an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having extensions attached into said weight.

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*o [I:\DayLib\LIBLL]02300.doc:AVS:caa In a fourth aspect, the present invention provides a shaving razor handle shank having first and second handle members defining gripping surfaces for a hand of a user, each said handle member having a plurality of inwardly extending posts, a weight having a plurality of location and securement apertures, said weight being retainedly sandwiched between said first and second handle members, wherein said first handle member comprises an elastomeric 'plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having said inwardly extending posts.

[I:\DayLib\LIBLL]02300.doc:AVS:ca In a fifth aspect, the present invention provides a shaving razor handle including an elongated hand gripping structure and cartridge support structure extending from an end of said hand gripping structure, wherein the elongated hand gripping structure further defines a recess and a metal weight is received in said recess, and wherein a gripping portion includes an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having extensions that are secured in said weight.

o* oo [I:\DayLib\LIBLL]02300doc:AVS:caa A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings, wherein: Fig. 1 is a perspective view of a shaving razor according to the invention.

Fig. 2 is a perspective view showing a handle and a replaceable cartridge of the Fig. 1 razor separated from each other.

Fig. 3 is an exploded view of the components of the Fig. 2 handle.

Fig. 3A is a diagrammatic sectional view, taken at 3A-3A of Fig. 2, of the Fig. 2 handle.

Fig. 4 is an exploded view of the components of the Fig. 2 replaceable cartridge.

Fig. 4A is an exploded sectional view, taken at 4A-4A of Fig. 14, of the components of the Fig. 2 replaceable cartridge.

Fig. 5 is a partial plan view showing a cartridge support structure at the end of the Fig. 2 handle.

Fig. 6 is an elevation of a plunger of the Fig. 2 handle.

*5 Fi.7i *ata etinlvetkna o i.5 fteFg [I:\DayLib\LIBLL]023O.doc:AVS:can -7cartridge support structure.

Fig. 8 is a sectional view taken at 8-8 of Fig. 5, of the Fig. 5 cartridge support structure.

Fig. 9 is a partial sectional view, taken at 9-9 of Fig. 5, of the Fig. cartridge support structure.

Fig. 10 is a plan view of an ejector used in the Fig. 5 cartridge support structure.

Fig. 11 is a perspective view of the Fig. 6 plunger.

Fig. 12 is an elevation of an ejector button used in the Fig. 5 cartridge support structure.

Fig. 13 is an elevation of the Fig. 2 replaceable cartridge.

Fig. 14 is a plan view of the Fig. 13 replaceable cartridge.

Fig. 15 is a bottom view of the Fig. 13 replaceable cartridge.

Fig. 16 is a side view, partially broken away, showing a housing of the Fig. 13 cartridge in an unbiased pivotal position with respect to a base structure of the cartridge prior to connection to a handle.

Fig. 17 is a side view, partially broken away, of the Fig. 13 cartridge in a biased position after connection to a handle.

Fig. 18 is a side view, partially broken away, showing the range of pivotal movement of the Fig. 13 replaceable cartridge.

Fig. 19 is a sectional view of an extension of the Fig. 2 handle.

Fig. 20 is a sectional view of an alternative embodiment of an extension of the Fig. 2 handle.

Figs. 21 and 22 are side views of alternative embodiments of cartridges S..i 25 having different pivotal support structures.

Referring to Figs. 1 and 2, shaving razor 10 includes handle 12 and replaceable shaving cartridge 14. As shown in Fig. 2, cartridge 14 is removable from handle 12. Cartridge 14 includes housing 16, which carries three blades 18, guard and cap 22. Cartridge 14 also includes interconnect member 24 on whicli-housing 16 is pivotally mounted. Interconnect member 24 includes base 27, which removably and fixedly attaches to asymmetrical extension 26 (Fig. 19) on handle 12, and two arms 28 that pivotally support housing 16 at its two sides.

-8- Referring to Fig. 3, handle 12 includes metallic colored plastic component 30 as a primary structural member on which the remaining components are mounted. Elongated portion 32 of component 30 has recess 34 for receiving metal zinc) weight 36, which is sandwiched between plastic gripping portions 38 and to provide a hand-gripping structure in the completed unit. Plastic gripping portions 38 and 40 are made of an elastomeric plastic outer gripping layer 37 therm6plastic elastomer) and a nonelastomeric plastic support layer 39 of acrylonitrile butadiene styrene) thereunder made by two-color molding. The nonelastomeric plastic support layer has extensions 41 that are press-fitted into weight 36 in elongated portion 32.

Fig. 3A illustrates the undeformed shape of extension 41 (in phantom) and the interference fit made by it at projection 43.

Cartridge support structure 42 extends from the end of elongated portion 32. It includes trapezoid shaped extension 26 (see Fig. 19) and the components that provide a spring-biased plunger action for biasing of housing 16 relative to interconnect 15 member 24. It also includes components that provide for ejection of cartridge 14 from handle 12.

Spring-biased plunger 44, spring 46, and U-shaped ejector 48 are received within recess 49 of cartridge support structure 42. Ejector button 50 is received in opening 52 on the top surface of support structure 42 and has bottom 20 extensions 54 that are received within rectangular region 56 at the back narrow portion of ejector 48.

Referring to Figs. 4, 4A and 15, housing 16 of cartridge 14 has inwardly facing slots 58 in side walls 60 for receiving the edges of the base portions 59 of blades 18 and respective resilient arms 62 (Fig. 15) on which each blade 18 is 25 resiliently supported. Blades 18 are located in a substantially unobstructed region 64 between side walls 60 to provide for ease of rinsing of the cartridge during use.

Cap 22 provides a lubricous shaving aid and is received in slot 66 at the rear of housing 16. Cap 22 may be made of a material comprising a mixture of a hydrophobic material and a water leachable hydrophilic polymer materialj-as is known in the art and is described, in U.S. Patents Nos. 5,113,585 and 5,454,164, which are hereby incorporated by reference. Guard 20 includes a finned elastomeric unit mounted at the front of housing 16 to engage and stretch the user's skin; other skin -9engaging protrusions, as described in U.S. Patent No. 5,191,712, which is hereby incorporated by reference, can be used. Clips 68 are secured at the respective sides of housing 16 inside of raised edges 70 of side walls 60 in order to retain blades 18 within housing 16 and to locate the cutting edges of the spring-biased blades at a desired exposure.

Clips 68 also wrap around the bottom of housing 16 and prevent the removal of pivotal support ends 72 of arms 28 of interconnect member 24. Base structure 27 has an opening 74 at the top through which spring-biased plunger 44 of the handle passes to act on a cam surface (not shown in Fig. 4) on the bottom of housing 16. Base structure 27 may have a curved or beveled shape.

Figs. 5-12 and 19 show the details of plunger 44, ejector 48, button and cartridge support structure 42. Referring to Fig. 5, recess 49 within cartridge support structure 42 has wide front portion 76 for receiving arms 78 of ejector 48 (Fig. 10) and a narrower portion 80 for receiving narrower portion 82 of ejector 48.

15 Rectangular region 56 at narrow portion 82 of ejector 48 is generally aligned with *opening 52 at the upper surface of support structure 42, though rectangular region 56 is movable with respect to opening 52 along slide axis 83 as ejector 48 is pushed outward by ejector button Referring to Figs. 8 and 12, each extension 54 of ejector button 50 has 20 an outwardly directed groove 84 that slides on a respective track 86 within opening 52 along axis 83. The upper surfaces 85 defining grooves 84 slide on the upper surfaces 89 of tracks 86, and the lower surfaces 91 defining groves 84 effect capture on or abut the lower surfaces 93 of track 86. Extensions 54 have inclined surfaces 87 that coact with the curved upper corners of tracks 86 to deflect extensions 54 inward as button 25 is inserted into cartridge support structure 42. When grooves 84 on extension 54 align with tracks 86, extensions 54 substantially return to their undeflected position and lock ejector button 50 in place within opening 52. Ejector 48 is placed within recess 49 before button 50 is inserted so that the ends of extensions 54 will be located within rectangular region 56 so as to retain ejector 48 within cartridge support stiieture 42.

Extensions 54 push against surfaces 94 of ejector 48 when ejector button 50 is pushed toward the end of handle 12. After button 50 has been inserted, upper vertical surfaces 96 of extensions 54 sit within the space between upper surfaces 98 of opening 52.

Spring 46 (Fig. 3) extends through the space between extensions 54 and is guided by the curved lower surface of spring guide 90 onbutton 50. As shown in Fig. 8, the lower surface defining recess 49 also has a curved central portion 92 to receive and guide spring 46.

S As shown in Figs. 6 and 11, plunger 44 has flat body 106, cylindrical rear extension 100 for receiving spring 46 (Fig. curved front cam follower portion 102 for acting on the camming surface 136 (Fig. 18) of housing 16, side arms 104, and aligned rear guide portions 108. Flat body 106 is positioned within the flat front portion of recess 49 (Fig, The portions of side arms 104 and aligned rear guide portions 108 above and below body 106 are located within slots 110, 112 located on both sides of asymmetrical extension 26. Side arms 104 have stop surfaces 114 that prevent forward movement of plunger 44 beyond the front and of slot 110 and 112.

The portions of side arms 104 and guide portions 108 above and below recess 49 within slots 110, 112 act as guides to guide the sliding action of plunger 44 along axis 15 83.

eoe ~Side arms 104 have inclined surfaces 120 to cause downward biasing of arms 104 when plunger 44 is inserted into recess 49 until stop surfaces 114 advance past the front ends of slots 110, 112 and stop surfaces 114 snap into position within the respective slot. Because slots 110, 112 are provided on both sides of asymmetrical extension 26, plunger 44 can be inserted in either position orientation, with the stop surface 114 directed into slot 110 or 112.

Referring to Figs. 5 and 9, one surface of asymmetrical extension 26 includes depressions 122 for receiving detents within base structure 27 of cartridge 14 in order to retain cartridge 14 on extension 26.

25 In manufacture of handle 12, the hand gripping components are assembled by first inserting weight 36 into recess 34, and then press-fitting extensions 41 of components 38, 40 into aligned apertures in weight 36. Weight 36 and components 38, 40 are locked in place by the interference fit between extensions 41 and projections 43, and elastomeric layer 37 deforms to provide a seal b~tween the side walls of elongated portion 32 of plastic component 30 and weight 36. (Fig. 3A shows the undeformed shapes of the components in phantom.) In assembling the components of cartridge support structure 42 at the 11 end of handle 12, ejector 48 is first inserted into recess 49. Spring 46 and plunger 44 are then inserted. Inclined surfaces 120 of side arms 104 are biased during insertion toward the middle of the recess and then snap into slot 1 10 or 112 (depending on plunger orientation) locking plunger 44, spring 46, and ejector 48 in place in cartridge S support structure 42. Spring 46 acts both to bias ejector 48 backward against the surfaces of recess 49 and button extensions 54 and to bias plunger 44 forward, stop surfaces 114 being biased against the forward edges of slot 1 10 or 112. Button 50 is inserted into opening 52 after ejector 48 has been inserted into position. Inclined surfaces 87 are biased inward by the curved upper portions of rails 86, and ejector button 50 is snapped into place with tracks 86 being located within grooves 84.

Figs. 13-18 .show further details of replaceable cartridge 14 and its pivotal movement. Referring to Fig. 13, *interconnect member 24 is shown assembled to housing 16 with pivotal support ends 72 retained by clips 68. It is seen that base structure 27 has a trapezoidal shaped recess 130 that has the same shape as extension 26 and mates with extension 26.

Referring to Fig. 15, housing 16, shown before the other cartridge components have been. assembled on it, has recesses 131 in which -the pivotal support ends 72 on the ends of arms 28 are received. Arms 28 deflect as support ends 72 are inserted through the openings to recesses 13 1 and then snap back to an undeflected 20 orientation after ends 72 are within recesses 131 to retain ends 72 in place.

Referring to Figs. 4A and 9, detents 132 within recess 130 of base 27 .mate with depressions 122 of asymmetrical extension 26. At the top of recess 130 is opening 74 which permits spring-biased plunger 44 to extend through base 27 and to *interact with camr-ning surface 136 on the bottom of housing 16.

Referring to Figs. 16-18, it is seen that each pivotal support end 72 has a lower curved surface 138 that slides on upper curved surface 140 of housing 16, providing a pivot axis at the center of a circle that includes surface 140. The pivot axis thus is in front of the blades in the region of guard 20. Fig. 16 shows housing 16 in an unbiased position in which pivotal support ends 72 support the front sifrface of guide wall 162. Fig. 17 shows the forwardly biased position for housing 16, in which case the forward surface of pivot supp~ort ends 72 are pushed up against a forward wall portion of housing 16. This is the at rest position for housing 16 prior to shaving. The 12forwardly-biased at rest position is achieved by contouring camming surface 136 so that the plunger 44 having cam follower surface 102 has an at rest position near the front of housing 16, as shown in Fig. 18.

Fig. 18 shows the range of pivotal motion for housing 16. During shaving, cap 22 will initially contact the user's skin, and housing 16 will piot clockwise and generally follow the contours of the user's face, being biased b plunger 44. The cap up initial orientation will cause the blade closer to cap 22 to initially be pushed against the skin more than the blades closer to the guard. However, the pivot at the region of guard and the light return force cause the cartridge to be "guard heavy" during shaving, with a higher load on the guard than the cap. The three blades are provided with progressive initial exposures, defined as the perpendicular distance or height of the blade edge measured with respect to a plane tangential to the skin contacting surfaces of the cartridge components immediately in front of and behind each blade. In particular, the primary blade has a negative initial exposure, the second 15 blade has zero initial exposure, and the third blade has positive initial exposure. The spring constants and preloads for the blades are the same, and the blades have "progressive force" distribution during shaving; the force on the third blade is greater than the force on the first blade, and the force on the second blade is intermediate to the forces on the first and third blades or equal to the force on either 20 the first or third blade. It is believed that beneficial shaving results are achieved when cartridges with three resiliently mounted blades exhibit, during shaving, such a :progressive force pattern.

Other embodiments of the invention are within the scope of the appended claims. The base structure could be held on the housing with a releasable latch. The blades could be loaded from the bottom instead of the top. The cartridge support structure could be made as a unit separate from the handle and attached to it.

In place of trapezoidal extension 26 (Fig. 19), a six-sided extension 226 (Fig. 20), or other asymmetrical shape could be employed.

The pivotal connection could be provided by pins in respective holes, shell bearings, and other techniques. referring to Fig. 21, the pivotal support structure could be provided by a flexible plastic hinge portion 200 that is made of material that is more flexible than the housing 202 and connects the housing 202 and 13 interconnect member 204 at a pivot region 206; these components could be made by two-color molding. Alternatively, referring to Fig. 22, the housing 208 and the interconnect member 210 may be made of the same piece of plastic, and the pivotal support structure may be provided by a living hinge 212. A living hinge could also be used with housings and interconnect members of different plastics.

Claims (16)

1. A shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein said elongated hand gripping structure has an outwardly directed upper surface and generally opposite thereof an outwardly directed lower surface and wherein said elongated hand gripping structure includes first and second gripping portions, each gripping portion comprising an elastomeric plastic outer gripping layer and a nonelastomeric plastic support layer thereunder having extensions press-fitted into said elongated hand gripping structure, said elastomeric outer gripping layer being molded to said nonelastomeric support layer and overlying a major portion of said nonelastomeric support layer, and wherein one of said gripping portions is positioned in overlying relation to said upper surface of said elongated hand gripping structure and the other gripping portion is positioned in overlying relation to said lower surface of said elongated hand gripping structure, said first and second gripping portions being attachable along Is inwardly oriented axes to attach to said hand gripping structure, whereby said hand gripping structure is sandwiched between the first and second gripping portions.

2. A shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein said elongated hand gripping structure includes a gripping portion comprising an elastomeric plastic outer gripping layer and a nonelastomeric plastic support layer thereunder having extensions press-fitted into said elongated hand gripping structure, wherein said elongated hand gripping structure is made of plastics and defines a recess, and wherein a weight is disposed in said recess.

3. A shaving razor handle according to claim 2, wherein said gripping C portion is press-fitted into said weight.

4. A shaving razor handle according to claim 3, wherein a plurality of gripping portions are press-fitted into said weight.

A shaving razor handle according to claim 2, wherein said elongated hand gripping structure is made of metallic-colored plastic.

6. A shaving razor handle according to claim 1, wherein the hand gripping structure further comprises a plurality of elongate slots, said slots being dimensioned not greater than said extensions of said gripping portions, whereby the extensions undergo plastic deformation upon insertion into said slots along an insertion direction parallel to an outward projection of said slots. [I:'DayLib\LIBLL]0232 .doc:AVS:caa

7. A shaving razor handle according to claim 6, wherein the gripping portion extensions prior to insertion are free of undercuts transverse to the insertion direction.

8. A shaving razor handle according to claim 6, wherein the slots have projections forming an interference fit with the extensions.

9. A shaving razor handle according to claim 1, wherein said elongate hand gripping structure has a longitudinal axis, and wherein each said first and second gripping portion outer elastomeric layer extends uninterrupted between the handle peripheral edges in a width direction transverse to the longitudinal axis.

10. A shaving razor handle including an elongated hand gripping structure and a cartridge support structure extending from an end of said hand gripping structure, wherein the elongated hand gripping structure includes an elongated handle portion of plastics material, wherein said elongated handle portion defines a weight receiving region, a metal weight disposed in said weight receiving region, and wherein said elongated .Is handle portion comprises an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having extensions attached into said 0.. weight.

11. A shaving razor handle according to claim 10, wherein said hand 9o• gripping structure further comprises at least a second handle portion, said second handle portion disposed on a side of said weight opposite said first handle portion, said second handle portion comprising an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having extensions attached into said weight.

A shaving razor handle shank having first and second handle members defining gripping surfaces for a hand of a user, each said handle member having a plurality of inwardly extending posts, a weight having a plurality of location and securement apertures, said weight being retainedly sandwiched between said first and second handle members, wherein said first handle member comprises an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having said inwardly extending posts.

13. A shaving razor handle shank according to claim 12, wherein an intermediate handle frame member has an open central region, wherein the weight is disposed in said central region, and wherein said first and second handle grip members overlie opposed upper and lower surfaces of said frame member. [I:\DayLib\LIBLL]0232I.doc:AVS:caa -16-

14. A shaving razor handle shank according to claim 13, wherein the frame member carries a cartridge support structure extending from a longitudinal end thereof.

A shaving razor handle including an elongated hand gripping structure and cartridge support structure extending from an end of said hand gripping structure, s wherein the elongated hand gripping structure further defines a recess and a metal weight is received in said recess, and wherein a gripping portion includes an elastomeric plastic outer gripping layer molded with a nonelastomeric plastic support layer thereunder having extensions that are secured in said weight.

16. A shaving razor handle according to claim 15, wherein the elongated hand gripping structure is made of plastics material. Dated 11 May, 2001 The Gillette Company Patent Attorneys for the Applicant/Nominated Person 15 SPRUSON FERGUSON [I:\DayLib\LIBLL]0232 I.doc:AVS:caa