Shaving razor handle

Abstract: A shaving razor handle (12), including an elongated hand gripping structure, and a cartridge support structure extending from an end of said hand gripping structure, characterized in that said cartridge support structure has outer side surfaces that mate with inwardly directed surfaces of a recess (130) on a cartridge and an end surface with a cam follower opening (74), and in that a spring-biased plunger (44) that has a cam follower surface is retained in said cartridge support structure and extends through said cam follower opening (74) of said cartridge support structure.

Description: 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. For example, German Patent Document No. DE-A-3635553 discloses a razor having a handle, a razor blade bolder and a pivot joint for the razor blade holder. The pivot joint is formed by a releasable snap-tight connection that fastens the holder to the handle. International Publication WO 94/08761 discloses a shaving system having a debris flow passage and a shaving head assembly that includes a socket portion with a latch structure and a locking edge structure for retention of the shaving head with a corresponding latch projection and latch recess, respectively, in a complementary handle portion. In general, in one aspect, the invention features a shaving razor handle, including an elongated hand gripping structure, and a cartridge support structure extending from an end of said hand gripping structure, characterized in that said cartridge support structure has outer side surfaces that mate with inwardly directed surfaces of a recess on a cartridge and an end surface with a cam follower opening, and in that a spring-biased plunger that has a cam follower surface is retained in said cartridge support structure and extends through said cam follower opening of said cartridge support structure. Certain implementations of the invention include one or more of the following features. In certain implementations: the outer side surfaces provide an asymmetrical shape to ensure proper orientation of the cartridge with respect to the handle; the spring-biased plunger is guided by a slot in the cartridge support structure; an ejector and snap fit ejector button are used to eject the cartridge; the ejector button has an inclined surface to facilitate attachment to the cartridge support structure; the ejector button slides on a guide surface in the cartridge support structure when pushing the ejector; the cartridge support structure has a track, and the ejector button has a groove that slides on the track. In certain implementations: the plunger and the ejector are biased in opposite directions by a spring; the plunger has a stop which retains the plunger within the cartridge support structure; the plunger has an arm with an inclined surface, the inclined surface and the stop extending above the plunger and being retained in the slot in the cartridge support structure to guide the plunger; the stop has an inclined surface to permit the stop to be inserted into the cartridge support structure; the plunger has a rear guide member to further guide the plunger. In certain implementations: the first end of the spring biases the plunger against the stop, and a second end of the spring biases the ejector against a back surface of the cartridge support structure; the ejector button and the cartridge support structure have spring support portions to capture and guide the spring. In certain implementations: the ejector is a U-shaped clip having ejector arms and narrower portions that engage the ejector button, and the cartridge support structure has a mating guide surface along which the ejector arms and the narrower portions slide. In certain implementations: the cartridge support structure and the elongated gripping structure are made of a single piece of plastic. Alternatively, the cartridge support structure and the elongated gripping structure are made from separate pieces of plastic that are secured to each other. In general, in another aspect, the invention features a method of making a shaving razor handle characterized by the steps of providing an elongated band gripping structure and an attached cartridge support structure extending form an end of said elongated hand gripping structure and having a recess therein with an inwardly directed stop surface, and inserting a spring and a plunger having a cam follower surface and an outwardly directed stop surface into said recess until said outwardly directed stop surface passes said inwardly directed stop surface and is retained by said inwardly directed stop surface. Certain implementations of the invention may include one or more of the following features: the ejector is inserted into the recess; an ejector button is inserted into the cartridge support structure to push the ejector. In general, in another aspect, the invention features a razor characterized by a replaceable shaving cartridge including a housing and an interconnect member, said housing carrying one or more blades, a guard, a cap, said interconnect member having a pivotal support structure that pivotally supports said housing and a central base structure having a recess, and a handle having a cartridge support structure including an extension shaped to mate with said recess, and a stepped portion having the same shape as said central base structure so as to continue the shape from said cartridge support structure to said central base structure. Implementations of the invention may include one or more of the following features. In certain implementation: the central base structure is flat along an axis that is parallel to the blade; the shape of the cartridge base structure is curved or beveled. Other advantages and features of the invention will be apparent from the detailed description of preferred embodiments thereof and from the claims. Fig. 1 is a perspective view of a shaving razor according to the invention. Fig. 2 is a perspective view of 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. Fig. 7 is a partial sectional view, taken at 7-7 of Fig. 5, of the Fig. 5 cartridge 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. 5 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 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 20 and cap 22. Cartridge 14 also includes interconnect member 24 on which 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. 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 (e.g., zinc) weight 36, which is sandwiched between plastic gripping portions 38 and 40 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 (e.g., thermoplastic elastomer) and a nonelastomeric plastic support layer 39 (e.g., 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 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 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 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 material, as is known in the art and is described, e.g., in U.S. Patents Nos. 5,113,585 and 5,454,164. Guard 20 includes a finned elastomeric unit mounted at the front of bousing 16 to engage and stretch the user's skin; other skin engaging protrusions, e.g., as described in U.S. Patent No. 5,191,712 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 50, 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. 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 50. Referring to Figs. 8 and 12, each extension 54 of ejector button 50 has 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 50 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 structure 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 on button 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. As shown in Figs. 6 and 11, plunger 44 has flat body 106, cylindrical rear extension 100 for receiving spring 46 (Fig. 3), 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. 6). 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 83. 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. 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 between 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 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 110 or 112 (depending on plunger orientation) locking plunger 44, spring 46, and ejector 48 in place in cartridge support structure 42. Spring 46 acts both to bias ejector 48 backward against the surfaces of recess 49 and button extcnsions 54 and to bias plunger 44 forward, stop surfaces 114 being biased against the forward edges of slot 110 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 131 and then snap back to an undeflected 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 camming 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 surface of guide wall 162. Fig. 17 shows the forwardly biased position for housing 16, in which case the forward surface of pivot support ends 72 arc pushed up against a forward wall portion of housing 16. This is the at rest position for housing 16 prior to shaving. The forwardly-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 pivot clockwise and generally follow the contours of the user's face, being biased by 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 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; i.e., 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 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. E.g., referring to Pig. 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 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: A shaving razor handle (12), including an elongated hand gripping structure, and a cartridge support structure extending from an end of said hand gripping structure, characterized in that said cartridge support structure has outer side surfaces that mate with inwardly directed surfaces of a recess (130) on a cartridge and an end surface with a cam follower opening (74), and in that a spring-biased plunger (44) that has a cam follower surface is retained in said cartridge support structure and extends through said cam follower opening (74) of said cartridge support structure. A shaving razor handle according to claim 1, characterized in that said outer side surfaces provide a section with au asymmetrical shape to ensure proper orientation of a cartridge (14) with respect to said handle (12). A shaving razor handle according to claim 2, characterized in that said shape is a trapezoid. A shaving razor handle according to claim 2, characterized in that said shape has six sides. A shaving razor handle according to claim 2, characterized in that said shape is flat. A shaving razor handle according to claim 1, characterized in that said handle (12) is snap fitted on to said cartridge (14). A shaving razor handle according to claim 6, characterized in that said cartridge (14) has a detent (132), and one of said outer side surfaces of said cartridge support structure has a mating depression adapted to receive said detent. A shaving razor handle according to claim 6, characterized in that one of said outer side surfaces of said cartridge support structure has a detent, and said cartridge has a mating depression adapted to receive said detent. A shaving razor handle according to claim 1, characterized in that said spring-biased plunger (44) is guided by a slot (110,112) in said cartridge support structure. A shaving razor handle according to any of claims 1 to 9, characterized in that an ejector (48) is controllable by a snap fit ejector button (50). A shaving razor handle according to claim 10, characterized in that said ejector button (50) has an inclined surface (87) to permit said button to be connected to said cartridge support structure. A shaving razor handle according to claim 10, characterized in that said ejector button slides on a guide surface on said cartridge support structure to push said ejector. A shaving razor handle according to claim 12, characterized in that said cartridge support structure has a track (86), and said ejector button has a groove (84) that slides on said track. A shaving razor handle according to claim 10, characterized in that said plunger (44) and said ejector (48) are biased in opposite directions by a spring (46). A shaving razor handle according to claim 14, characterized in that said plunger (44) has a stop (114) which retains said plunger within said cartridge support structure. A shaving razor handle according to claim 15, characterized in that said plunger has an arm (104) with an inclined surface (120), said inclined surface and said stop extending above said plunger and retained in said slot in said cartridge support structure to guide said plunger. A shaving razor handle according to claim 16, characterized in that said stop (114) has an inclined surface to permit said stop to be inserted into said cartridge support structure. A shaving razor handle according to claim 16, characterized in that said plunger (44) has a rear guide member to further guide said plunger, A shaving razor handle according to claim 15, characterized in that a first end of said spring (46) biases said plunger (44) against said stop and a second end of said spring biases said ejector (48) against a back surface of said cartridge support structure (42). A shaving razor handle according to claim 19, characterized in that said ejector button (50) and said cartridge support structure (42) have spring support portions to capture and guide said second end of said spring (46). A shaving razor handle according to claim 10, characterized in that said ejector (48) is a U-shaped clip having ejector arms (78) with narrower portions that receive said ejector button (50), and said cartridge support structure has a mating guide surface along which said ejector arms and said narrower portions slide. A shaving razor handle according to claim 1, characterized in that said cartridge support structure and said elongated gripping structure are made of a single piece of plastic. A shaving razor handle according to claim 1, characterized in that said cartridge support structure and said elongated gripping structure are made from separate components that are secured to each other. A method of making a shaving razor handle characterized by the steps of providing an elongated hand gripping structure and an attached cartridge support structure extending form an end of said elongated hand gripping structure and having a recess therein with an inwardly directed stop surface, and inserting a spring and a plunger having a cam follower surface and an outwardly directed stop surface into said recess until said outwardly directed stop surface passes said inwardly directed stop surface and is retained by said inwardly directed stop surface. A method according to claim 24, further characterized by inserting an ejector into said recess. A method according to claim 25, further characterized by inserting an ejector button into said cartridge support structure to push said ejector. A method according to claim 26, further characterized by providing a guide surface in said cartridge support structure on which said ejector button slides to push said ejector. A method according to claim 27, further characterized by providing a track in said cartridge support structure and a groove on said ejector button so that said groove slides along said track. A method according to claim 26, characterized in that said ejector is a U-shaped clip having ejector arms with narrower portions that receive said ejector button, and said cartridge support structure has a mating guide surface along which said ejector arms and said narrower portions slide. A method according to claim 24, characterized in that the plunger and the ejector are biased in opposite directions by the spring. A method according to claim 25, characterized in that a first end of said spring biases said plunger against said stop and a second end of said spring biases said ejector against aback surface of said cartridge support structure. A method according to claim 25, characterized in that said plunger has an arm with an inclined surface, said inclined surface and said outwardly directed stop surface extending above said plunger and retained in said slot in said cartridge support structure to guide said plunger. A method according to claim 32, characterized in that said outwardly directed stop has an inclined surface to permit said outwardly directed stop to be inserted into said cartridge support structure. A method according to claim 32, characterized in that said plunger has a rear guide member to further guide said plunger. A razor (10) characterized by a replaceable shaving cartridge (14) including a housing (16) and an interconnect member (24), said housing (16) carrying one or more blades (18), a guard (20), a cap (22), said interconnect member (24) having a pivotal support structure (28) that pivotally supports said housing and a central base structure (27) having a recess (130), and a handle (12) having a cartridge support structure (42) including an extension (26) shaped to mate with said recess (130), and a stepped portion having the same shape as said central base structure so as to continue the shape from said cartridge support structure to said central base structure. A razor according to claim 35, characterized in that the central base structure (27) is flat along an axis that is parallel to the blade. A razor according to claim 35, characterized in that said shape of said cartridge base structure is curved. A razor according to claim 35, characterized in that said shape of said cartridge base structure is beveled.

Inventors: APPRILLE JR DOMENIC VINCENT, CHAULK DONALD ROBERT, FUCCI JOSEPH GEORGE, METCALF STEPHEN CABOT, TROTTA ROBERT ANTHONY, WORRICK CHARLES BRIDGHAM III, APPRILLE, JR., DOMENIC VINCENT, CHAULK, DONALD ROBERT, FUCCI, JOSEPH GEORGE, METCALF, STEPHEN CABOT, TROTTA, ROBERT ANTHONY, WORRICK, CHARLES BRIDGHAM, III
Applicants: GILLETTE CO, THE GILLETTE COMPANY
Application year: 1997
Main classification: B26B21
IPC codes: B26B21