EP3744488A1 - Rasierklingeneinsatz - Google Patents

Rasierklingeneinsatz Download PDF

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Publication number
EP3744488A1
EP3744488A1 EP19177659.0A EP19177659A EP3744488A1 EP 3744488 A1 EP3744488 A1 EP 3744488A1 EP 19177659 A EP19177659 A EP 19177659A EP 3744488 A1 EP3744488 A1 EP 3744488A1
Authority
EP
European Patent Office
Prior art keywords
blade
inter
razor cartridge
span
trailing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19177659.0A
Other languages
English (en)
French (fr)
Inventor
Ioannis Bozikis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BIC Violex Single Member SA
Original Assignee
BIC Violex SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BIC Violex SA filed Critical BIC Violex SA
Priority to EP19177659.0A priority Critical patent/EP3744488A1/de
Priority to BR112021012483-7A priority patent/BR112021012483A2/pt
Priority to MX2021007698A priority patent/MX2021007698A/es
Priority to PCT/EP2020/052239 priority patent/WO2020157173A1/en
Priority to CN202080007359.5A priority patent/CN113226675B/zh
Priority to US17/426,295 priority patent/US20220088809A1/en
Priority to JP2021536830A priority patent/JP2022519991A/ja
Priority to KR1020217019565A priority patent/KR20210122230A/ko
Priority to EP20702022.3A priority patent/EP3917730A1/de
Publication of EP3744488A1 publication Critical patent/EP3744488A1/de
Priority to US17/158,357 priority patent/US11059193B2/en
Priority to IL283880A priority patent/IL283880A/en
Priority to US17/345,526 priority patent/US20210370534A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/4012—Housing details, e.g. for cartridges
    • B26B21/4031—Housing details, e.g. for cartridges characterised by special geometric shaving parameters, e.g. blade span or exposure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/08—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
    • B26B21/14—Safety razors with one or more blades arranged transversely to the handle
    • B26B21/22—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously
    • B26B21/222—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit
    • B26B21/227—Safety razors with one or more blades arranged transversely to the handle involving several blades to be used simultaneously with the blades moulded into, or attached to, a changeable unit with blades being resiliently mounted in the changeable unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/40—Details or accessories
    • B26B21/4012—Housing details, e.g. for cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/54—Razor-blades
    • B26B21/56—Razor-blades characterised by the shape
    • B26B21/565—Bent razor blades; Razor blades with bent carriers

Definitions

  • the embodiments described in the following disclosure relate to a razor cartridge, a method for manufacturing a razor cartridge, a shaving razor assembly and an associated kit of parts.
  • Razor cartridges are permanently or removably attached to a razor handle that, in use, is oriented in shaving direction.
  • Razor cartridges typically comprise one or more cutting members, each supporting a blade, mounted perpendicular to the shaving direction.
  • Razor cartridges are also typically provided with a guard (at a leading longitudinal side of the razor cartridge in the shaving direction) and a cap (at a trailing longitudinal side of the razor cartridge in the shaving direction).
  • a skin care element is also often provided at the trailing longitudinal side. In use, a user holds the razor handle in the shaving direction and brings the razor cartridge into contact with a portion of skin defining a shaving plane.
  • the shaving plane is defined as the tangential line intersecting the first and second skin contact points of, for example, cutting edges of the shaving head. More simply, the shaving plane may be approximated as a line between the highest points on the skin-contacting surfaced of a razor cartridge - for example, the flat plane between the top of a guard and the top of a cap of the shaving head. Movement of the razor handle causes the blades of the razor cartridge to be moved across the shaving plane in the shaving direction, enabling the blades to remove unwanted hair.
  • the performance of razor cartridges may be further improved.
  • a razor cartridge comprises three or more substantially parallel cutting members disposed between a leading longitudinal side, and a trailing longitudinal side of the razor cartridge in a shaving direction of the razor cartridge.
  • Each of the cutting members comprises a blade support comprising a blade mounting portion disposed on an inner surface of the respective blade support that, in use, faces away from a shaving plane SH (shaving surface), and a blade attached to the blade mounting portion.
  • a shaving plane SH shaving surface
  • the cutting members are disposed to define a plurality of inter-blade spans between cutting edges of the blades.
  • a leading inter-blade span that is closer to the leading longitudinal side of the razor cartridge than a trailing inter-blade span is greater than the trailing inter-blade span that is closer to the trailing longitudinal side of the razor cartridge than the leading inter-blade span.
  • a razor cartridge comprises three or more substantially parallel cutting members disposed between a leading longitudinal side, and a trailing longitudinal side of the razor cartridge in a shaving direction of the razor cartridge.
  • Each of the cutting members comprises a blade support comprising a blade mounting portion disposed on an inner surface of the respective blade support that, in use, faces away from a shaving plane SH, and a blade attached to the blade mounting portion.
  • the cutting members are disposed to define a plurality of inter-blade spans between cutting edges of the blades.
  • a leading inter-blade span that is closer to the leading longitudinal side of the razor cartridge is greater than a trailing inter-blade span that is closest to the trailing longitudinal side of the razor cartridge.
  • a method of manufacturing a razor cartridge comprises:
  • the cutting members define a plurality of inter-blade spans between cutting edges of the blades.
  • a leading inter-blade span that is closest to the leading longitudinal side of the razor cartridge is greater than a trailing inter-blade span that is closest to the trailing longitudinal side of the razor cartridge.
  • a shaving razor assembly comprising:
  • the razor handle may be re-used by changing the razor cartridge, or the razor cartridge is fixedly attached to the razor handle, via a pivotable, or non-pivotable connection.
  • a kit of parts comprising a razor handle and a razor cartridge holder comprising a plurality of razor cartridges according to the first aspect.
  • An effect of a razor cartridge according to the first aspect is that when shaving, the blade supports of the cutting members are brought into contact with the skin (shaving plane) in addition to the cutting edges of the blade. Therefore, the number of contact points between the razor cartridge and the skin is increased, up to being doubled. The amount of pressure exerted on a portion of skin by each cutting edge is significantly reduced, leading to fewer incidents of skin injury ("nicking") and a more comfortable shave.
  • the blade is mounted on an inner surface of the blade support to enable the blade support to simultaneously contact the skin at the same time as the cutting edge of the blade, in use. This means that the portions of the blade support in contact with the skin reduce or minimize the "skin bulge", thus reducing the risk of nicks and cuts occurring.
  • Another effect is that durability of the blades is prolonged, since less pressure is applied to the skin thus resulting in a less aggressive shaving and therefore the blades wear at a lower rate.
  • Another effect is that an inter-blade span between cutting edges towards the leading longitudinal side of the razor cartridge is increased compared to an inter-blade span between cutting edges towards the trailing longitudinal side of the razor cartridge.
  • Another effect of an increased inter-blade span between cutting edges (and therefore cutting members) towards the leading longitudinal side of the razor cartridge compared to an inter-blade span between cutting edges towards the trailing longitudinal side of the razor cartridge is that the larger gap between the cutting members at the leading longitudinal side of the razor cartridge enables more removed hair to pass through, and a greater flow of debris and foam during shaving as well as a greater degree of rinsability. Infrequent razor users wait several days between shaving, leading to a requirement for a greater degree of hair removal compared to the case of a user who shaves daily.
  • a razor cartridge according to the present disclosure is better adapted to e.g. users who shave less frequently, because the increased inter-blade span (or spans) towards the leading longitudinal edge of the razor cartridge can accommodate the denser and/or longer hair clippings characteristic of users who shave less frequently.
  • FIG 1 is a perspective view of a shaving razor assembly 1 according to an aspect.
  • the shaving razor assembly comprises blades which are not driven by a motor.
  • the shaving razor assembly 1 comprises a handle 2 extending in a handle direction H between a proximal portion 4 and a distal portion 6 of the handle 2.
  • a razor cartridge 20 is mounted at the distal portion 6 of the handle 2.
  • the razor cartridge 20 will be presented in more detail following discussion of the shaving razor assembly 1.
  • the mounting of the razor cartridge 20 to the distal portion 6 of the handle 2 in the illustration is via a pivotable bearing member 8a enabling a frame of reference of the handle 2 to vary relative to a frame of reference of the razor cartridge 20, to thus enable the angle of the razor cartridge against the skin of a user to vary and adapt to changes during use.
  • the razor cartridge 20 pivots relative to the handle 2 about the longitudinal axis L of the razor cartridge 20 20, in use.
  • the pivoting enables the user to adapt to contours of the body, for example.
  • the longitudinal axis L of the razor cartridge 20 is substantially perpendicular to the shaving direction along the handle 2.
  • Another example of a connection mechanism for connecting the razor cartridge 20 to the handle 2 is discussed in WO2006/027018 A1 .
  • Another alternative is a razor cartridge 20 that may pivot relative to a second pivot axis (a rocking axis), substantially perpendicular to axis L.
  • the pivotable bearing member 8a may be omitted (not illustrated) and the handle 2 provided as an integrally connected part of the support of the razor cartridge 20.
  • the pivotable bearing member 8a may further comprise, or be replaced by, a release mechanism 5a, 5b, enabling rapid release of an exhausted razor cartridge from the handle 2.
  • the handle 2 and the support of the razor cartridge 20 are integrally formed with a pivotable bearing member (not illustrated) such as a plastic spring member.
  • the handle 2 is provided with a handle grip 9 formed of a rubber, or rubber-like material to improve gripping friction.
  • the handle is provided with a thumb-rest 7 to enable a more secure grip of the handle 2 by a user.
  • Figures 2a and 2b are schematic side views of a portion of a prior art razor cartridge in use.
  • the inter-blade span is measured to be constant in a range of about 1.05 mm to 1.5 mm, and the razor blade is mounted on the top of the blade support.
  • top of the blade support for the purposes of this specification means a side of a blade support of a razor cartridge that is closest to a shaving plane SH (skin) of a user when the razor cartridge is in use, as illustrated in Figures 2a and 2b .
  • a razor cartridge with such top-mounted cutting members aggressive shaving may result in an increased degree of nicks and cuts and an increased sense of irritation, because the shaving plane SH (skin) is exclusively supported by the cutting edges 30 of the blades on the blade support. This provides the skin with a relatively small surface to be supported on during shaving, and causes an increased degree of "bulging" 12 of the shaving plane SH (skin) between the inter-blade gaps.
  • FIG 3 is a schematic side view of a portion of a prior art razor cartridge in use.
  • the inter-blade span IBS can be reduced, as illustrated in Figure 3 .
  • this results in a reduced gap for rinsing, and debris such as foam or hair can easily block a gap having a narrow inter-blade span.
  • a greater blade density (number of blades in the same-sized cartridge) is also required when the IBS between all blades is reduced.
  • a razor cartridge 20 comprising: three or more substantially parallel cutting members disposed between a leading longitudinal side 24 and a trailing longitudinal side 25 of the razor cartridge in a shaving direction of the razor cartridge.
  • Each of the cutting members comprises a blade support comprising a blade mounting portion disposed on an inner surface of the respective blade support that, in use, faces away from a shaving plane SH, and a blade attached to the blade mounting portion.
  • the cutting members are disposed to define a plurality of inter-blade spans between cutting edges 30 of the blades.
  • a leading inter-blade span that is closest to the leading longitudinal side 24 of the razor cartridge is greater than a trailing inter-blade span that is closest to the trailing longitudinal side 25 of the razor cartridge.
  • Figure 4 is a perspective partial exploded view of a razor cartridge 20 according to an example of the first aspect. "Partial exploded view” means that some minor components of the razor cartridge 20 have been omitted from the exploded view to aid clarity of the drawing.
  • the shaving direction S is depicted in Figure 4 using arrow S.
  • the razor cartridge 20 contacts a shaving plane SH (not shown in Figure 4 ), and is translated across the shaving plane SH in the direction of arrow S.
  • a frame 21 may be fabricated partially or completely of synthetic materials, such as plastic, resin, or elastomers.
  • the frame 21 comprises a platform member 22 connectable to a handle 2 of a shaving razor assembly 1 either integrally, or by a connection mechanism such as a pivotable bearing member 8a or by an interconnecting member (not shown).
  • a guard member 23 is provided as a substantially longitudinal edge of the razor cartridge 20.
  • the guard member 23 is the first portion of the razor cartridge 20 to contact uncut hairs, and it is thus located at a leading longitudinal side 24 of the razor cartridge 20.
  • the side of the razor cartridge 20 opposite to the leading longitudinal side of the razor cartridge 20 and opposite to the shaving direction is the trailing longitudinal side 25 of the razor cartridge 20.
  • the trailing longitudinal side 25 is thus the final portion of the razor cartridge 20 to contact the shaving plane SH, in use.
  • leading longitudinal side 24 and “trailing longitudinal side 25” are used to denote specific locations on the razor cartridge 20, and do not imply or require the absence or presence of a particular feature.
  • a guard member 23 may in one example be located at the "leading longitudinal side 24"
  • a trimming blade (not shown in Figure 4 ) may be located at the "trailing longitudinal side 25" in another example, but it is not essential that these locations comprise such features.
  • the guard member 23 in an example, comprises an elastomeric member (not shown in Figure 4 ).
  • the elastomeric layer comprises one or more fins extending longitudinally in parallel to the guard member 23 and substantially perpendicularly to the shaving direction.
  • One purpose of such an elastomeric layer is, for example, to tension the skin prior to cutting.
  • the razor cartridge 20 may, in embodiments, further comprise a cap member at, or near to, the trailing longitudinal side 25 but this is not illustrated in the embodiment of Figure 4 as an aid to clarity.
  • the razor cartridge 20 further comprises a group of cutting members 29 accommodated in a blade receiving section 31 of the frame 21.
  • the group of cutting members 29 comprises a plurality of cutting members 28a-d.
  • the group of cutting members 29 is disposed in the frame 21 longitudinally and parallel to the shaving direction SH such that in use, blades of the cutting members 28a-d contact a shaving plane SH and cut hair present on the shaving plane SH as the razor cartridge 20 is moved across the shaving plane SH in the shaving direction S.
  • the particular design of the group cutting members 29 will be discussed in detail subsequently.
  • a razor cartridge is provided with three cutting members. In an example, a razor cartridge is provided with four cutting members. In an example, a razor cartridge is provided with five cutting members. In an example, a razor cartridge is provided with six cutting members. In an example, a razor cartridge is provided with seven or more cutting members.
  • the group of cutting members 29 defines a plurality of substantially parallel inter-blade spans.
  • the number of inter-blade spans is one fewer than the number of cutting members.
  • the frame 21 further comprises first retainer 26 and second retainer 27 configured to hold the razor blades within razor cartridge 20 housing.
  • the frame 21 further comprises first 16 and second 18 side portions. When the razor cartridge 20 is in an assembled state, the first and second side portions 16, 18 are configured to fixedly confine the longitudinal ends of the guard member 23, a cap member 29 (if present, not shown in Figure 4 ) and the group of cutting members 29.
  • the first side retainer 26 and second retainer 27 may comprise, for example, plastic, an elastomer, or a metal material and furthermore may be of a different shape to that illustrated.
  • a pivotable bearing member 8b may, in an example be provided on the side of the razor cartridge 20 configured to connect to a pivotable handle 2.
  • a pivotable bearing member 8b in an example, comprises two or more shell bearings configured to connect to the pivotable bearing member 8a of the handle 2.
  • the cutting members comprised in the group of cutting members 29 are disposed in the razor cartridge such that two cutting edges 30 comprised, respectively, on the two foremost (nearest to the leading side of the razor cartridge) cutting members of the group of cutting members 29 define a leading inter-blade span that is closest to the leading longitudinal side 24 of the razor cartridge 20 and that is greater than a trailing inter-blade span defined between the two cutting edges that are closest to the trailing longitudinal side 25 of the razor cartridge.
  • the inter-blade spans are illustrated further in Figure 10 and discussed subsequently.
  • the each cutting member in the group of cutting members 29 comprises a longitudinal blade support 32.
  • a longitudinal blade is mounted on the blade support 32.
  • the cutting edge 30 of a cutting member 28a-d is oriented forward in the direction of shaving S.
  • the blade support 32 of a cutting member 28a-d is an elongated, bent piece of rigid material.
  • the blade support 32 is a metal such as austenitic stainless steel.
  • Each cutting member in the group of cutting members 29 is, in an example, resiliently mounted in a blade receiving section 31 of the razor cartridge 20.
  • the blade receiving section 31 comprises a longitudinal space in the razor cartridge 20 that is sized to accommodate the group of cutting members 29.
  • At least one cutting member of the group of cutting members 29, up to all cutting members in the group of cutting members 29 may be resiliently mounted in the blade receiving section 31.
  • the transverse inner sides of frame 21 comprise a plurality of holding slots 34.
  • Each holding slot 34 on the transverse inner sides is configured to accept and retain one side of a blade support 32 of a cutting member of the group of cutting members 29 so that the cutting members of the group of cutting members 29 are held in the blade receiving section 31 with a substantially parallel inter-blade span. Therefore, as many holding slots 34 are provided in each transverse inner side of frame 21 as there are blade support members.
  • the cross members 35 may comprise a plurality of blade support guides 36 provided as a plurality of protuberances aligned with the holding slot 34 on the transverse inner sides of the frame 21.
  • the blade support guides 36 function to regulate the parallel inter-blade span in a longitudinal direction.
  • a razor cartridge 20 has a variable inter-blade span IBS. Therefore, in one variant, the spacing of the blade supports 32 is progressively decreased between the leading longitudinal side 24 and the trailing longitudinal side 25 of the razor 20 to generate the variable inter-blade span IBS.
  • One alternative way to achieve this arrangement is to progressively decrease the spacing between the holding slots 34 provided on the transverse inner sides in a transverse direction (y to -y) of the razor cartridge. The positioning and/or width of the blade support guides 36 is adjusted commensurately such that the group of inter blade spaces IBS between cutting edges 30 of the cutting members 28a-d is parallel.
  • the razor cartridge 20 of Figure 4 as comprises four resilient fingers 38a, 38b, 38c, 38d under the first retainer 26.
  • the razor cartridge 20 comprises four resilient fingers under the second retainer 27 that are in transverse corresponding alignment with the four resilient fingers 38a, 38b, 38c, 38d under the first retainer 26.
  • the eight resilient fingers each exert a bias force against respective cutting members of the group of cutting members 29 in the direction of the shaving plane SH such that the cutting members of the group of cutting members 29 are in a rest position, when assembled.
  • the cutting edges 30 of the blades 33 at each lateral end of the blades 33 near the first 26 and second 27 retainers, bear against corresponding stop portions, for example.
  • the stop portions may be the first 26 and second 27 retainer.
  • the rest position of the cutting members 28a-d is well defined, enabling a high shaving precision.
  • the illustrated biasing arrangement has many variations.
  • a further plurality of resilient fingers may be provided on one or more of the cross members 35.
  • the resilient fingers may be omitted.
  • the number of resilient fingers 38 to be provided is related to the number of cutting members 28a-d in the group of cutting members 29, and that fewer or more than eight resilient fingers 38 can be provided.
  • Figure 5a is a schematic cutaway side view of a razor cartridge taken from the embodiment of Figure 4 along transverse axis P-Q illustrated by the dotted line in Figure 4 .
  • like elements are denoted with like reference numerals.
  • Figure 5a further illustrates a longitudinal trailing assembly 49 that may, in some examples, be included as part of a razor cartridge 20 but is not essential.
  • the longitudinal trailing assembly 49 in examples, comprises a longitudinal skin care element 50 (e.g. a lubricating strip) for applying a compound, such as a lubricating compound, to the shaving plane after the cutting edges 30 of the blades have passed over the shaving plane.
  • a longitudinal skin care element 50 e.g. a lubricating strip
  • a compound such as a lubricating compound
  • the longitudinal trailing assembly 49 in examples, comprises a longitudinal trimming blade 53 disposed on the trailing longitudinal side 25 of the razor cartridge 20.
  • the trimming blade 53 may, for example, be used for trimming hairs that are awkward to reach using the blades 33 of the group of cutting members 29, such as extraneous nasal hairs.
  • the trimming blade 53 only extends across a proportion of the longitudinal direction of the longitudinal trailing assembly 49, such as up to three quarters, up to one half, or up to one quarter.
  • the trimming blade 53 is mounted on a trimming blade support 54.
  • the assembly of the trimming blade 53 mounted on a trimming blade support 54 is, in an example, identical to the design of the blade receiving section 31, blade support 32, and blade 33 comprised in the group of cutting members 29 to reduce parts variation.
  • the trimming blade 53 and trimming blade support 54 are produced to a different design to the design of the blade receiving section 31, blade support 32, and blade 33 comprised in the group of cutting members 29.
  • the trimming blade 53 is not comprised within the group of cutting members 29 intended to contact the shaving plane.
  • an inter-blade span is defined between cutting edges 30a-d of the blades 33a-d of the group of cutting members 29, however a span between a cutting edge 53 of the trimming blade and one of the cutting edges 30a-d of the blades 33a-d of the group of cutting members 29 is not considered to be an inter-blade span.
  • the longitudinal trailing assembly 49 comprises a retractable cover 52 as a safety feature, and to keep the trimming blade 53 sharp when not in use.
  • the longitudinal trailing assembly 49 and/or the retractable cover 52 may be provided as a plastic or resin material.
  • the longitudinal trailing assembly 49 is formed integrally with the frame 21.
  • the longitudinal trailing assembly 49 is glued or ultrasonically welded to the frame 21, for example.
  • a razor cartridge 21 is provided without a longitudinal trailing assembly 49 such that the trailing edge of the frame 21 in the shaving direction is the trailing longitudinal side 25 of the razor cartridge 20.
  • the trailing longitudinal side 25 of the longitudinal trailing assembly 49 in the shaving direction is considered to be the trailing edge of the frame 21 in the shaving direction.
  • Figure 5a illustrates a side view of the holding slots 34 provided in the first 26 and second 27 retainer for holding the group of cutting members 29.
  • the plurality of blade support guides 36 and the plurality of resilient fingers 38 shown in Figure 4 is not shown in the projection of Figure 5a to aid clarity.
  • Figure 5a illustrates the progressively decreasing span in the longitudinal direction between the succession of holding slots 34 for holding the group of cutting members 29 provided in the first 16 and second 18 side portions, in the direction from the leading longitudinal side 24 to the trailing longitudinal side 25.
  • the provision of a succession of holding slots 34 in the first 26 and second 27 retainers to support the cutting members of the group of cutting members 29 is not essential.
  • the group of cutting members 29 could also be supported using a plurality of blade support guides 36 (protuberances) positioned on one or more cross members 35, for example, where the plurality of blade support guides 36 provide a progressively decreasing inter-blade span in the longitudinal direction from the leading longitudinal side 24 to the trailing longitudinal side 25 of the razor cartridge 20.
  • a plurality of blade support guides 36 and a succession of holding slots 34 may be used in combination to provide progressively decreasing span in the longitudinal direction.
  • Figure 5b is a duplicate of the schematic cutaway side view of the razor cartridge 20 shown in Figure 5a that has been annotated to denote inter-blade spacing.
  • the longitudinal line on the internal leading longitudinal wall of the blade receiving section 55 that is closest to a shaving plane SH in use serves as an origin O for the purposes of the present definition.
  • a leading blade 33d to frame 21, span 44 is the transverse span (substantially aligned with the shaving direction S) that is perpendicular to the longitudinal orientation of the blades of the group of cutting members 29 that spans the space between the internal leading longitudinal wall of the blade receiving section 55 that is closest to a shaving plane SH in use (the origin) and the cutting edge 30d of the leading blade of the group of cutting members 29.
  • a leading inter-blade span 40 that is the closest inter-blade span to the leading longitudinal side 24 of the razor cartridge is a transverse span (substantially aligned with the shaving direction S in use) that is substantially perpendicular to the longitudinal orientation of the blades of the group of cutting members 29.
  • the leading inter-blade span 40 begins at a point on cutting edge 30d and ends on to a corresponding point on the cutting edge 30c of the first intermediate blade 33c.
  • a first intermediate inter-blade span 41 is a transverse span (substantially aligned with the shaving direction S in use) that is substantially perpendicular to the longitudinal orientation of the blades of the group of cutting members 29.
  • the first intermediate inter-blade span 41 begins at a point on cutting edge 30c and ends on a corresponding point on the cutting edge 30b of the second intermediate blade 33b.
  • a trailing inter-blade span 42 is a transverse span (substantially aligned with the shaving direction S in use) that is perpendicular to the longitudinal orientation of the blades of the group of cutting members 29.
  • the trailing inter-blade span 42 begins a point on cutting edge 30b and ends on a corresponding point on the cutting edge 30a of the blade 33a that is closest to the trailing longitudinal side 25 of the razor cartridge 20.
  • a trailing blade to frame span 45 that is a transverse span (substantially aligned with the shaving direction S in use) that is perpendicular to the longitudinal orientation of the blades of the group of cutting members 29 the cutting edge 30a and a corresponding point on the internal trailing longitudinal wall of blade receiving section 56.
  • the total span of the blade receiving section 31 corresponds to the sum of spans 44, 40, 41, 42, and 45.
  • the total span of the blade receiving section may be in the range of 7 to 15 mm.
  • each blade mounting portion 71 is disposed on an inner surface 66 of a respective blade support 32 that, in use, faces away from a shaving plane SH.
  • the cutting edge 30 extends forward from the front of the blade support 32.
  • the blade support 32 has a non-negligible thickness.
  • the blade support 32 has a thickness in the range 0.12 mm - 0.21 mm, and more preferably in the range 0.155 mm - 0.185, and most preferably 0.17 mm.
  • a non-negligible span defined as the transverse span (substantially aligned with the shaving direction S in use) that is perpendicular to the longitudinal orientation exists between each cutting edge 30 and the blade-mounting end of each blade support 32 of each cutting member of the group of cutting members 29.
  • This may be referred to as a cutting edge to blade span 43 of a respective cutting member.
  • the edge support span may be derived using trigonometry based on the thickness of the blade support 32 and the tilt angle relative to the shaving plane of the blade receiving section 31 of the blade support 32.
  • each blade support 32 of the group of cutting members 29 is identical and has the same thickness T2 and the same tilt angle A.
  • the cutting edge to blade span 43a, 43b, 43c, and 43d are identical.
  • one or more of the cutting edge to blade spans 43a, 43b, 43c, and 43d are in the range 0.3 mm to 0.6 mm, and specifically 0.5 mm.
  • At least one blade support 32 of the group of cutting members 29 has a different thickness and/or tilt angle to the remainder of the blade supports 32.
  • at least one a cutting edge to blade span 43a will differ from the remainder.
  • An effect is that individual a cutting edge to blade span 43a-43d may be individually tuned to provide further fine control over skin bulge effects.
  • the cutting edge to blade span 43a-43d may be designed to progressively increase or decrease.
  • a leading blade to frame span 44 is a transverse span (substantially aligned with the shaving direction S in use) that is perpendicular to the longitudinal orientation of the blades of the group of cutting members 29.
  • the leading blade to frame span begins at a point on the internal leading longitudinal wall 55 that is, in an example, closest to the shaving plane SH.
  • the leading blade to frame span ends at a corresponding point on the cutting edge 30d of the blade 33 of the leading cutting member 28d that is in an example, closest to the shaving plane SH.
  • leading frame to blade span 44 is 0.5 mm to 0.9 mm, and specifically 0.7 mm
  • a trailing blade to frame span 45 is a transverse span (substantially aligned with the shaving direction S in use) that is perpendicular to the longitudinal orientation of the blades of the group of cutting members 29.
  • the following blade to frame span begins at a point on the cutting edge 30a of the blade 33a of the trailing cutting member 28a-d.
  • the trailing blade to frame span 45 ends at a corresponding point on the internal trailing longitudinal wall 56 that is, in an example, closest to the shaving plane SH.
  • the trailing frame to blade span 44 is 1.6 mm to 2.0 mm, and specifically 1.8 mm In an example, the leading blade to frame span 44 is greater than the trailing blade to frame span 45.
  • leading blade to frame span 44 is smaller than the trailing blade to frame span 45.
  • leading blade to frame span 44 is substantially equal to than the trailing blade to frame span 45.
  • leading blade to frame span 44 is greater than the leading inter-blade span 40.
  • leading blade to frame span 44 is substantially equal to than the leading inter-blade span 40.
  • leading blade to frame span 44 is smaller than to the leading inter-blade span 40.
  • the trailing blade to frame span 45 is greater than the trailing inter-blade span 42.
  • the trailing blade to frame span 45 is substantially equal to the trailing inter-blade span 42.
  • the trailing blade to frame span 45 is smaller than the trailing inter-blade span 42.
  • first intermediate inter-blade span 41 and the second intermediate inter-blade span 42 are each substantially equal to the leading inter-blade span 40.
  • first intermediate inter-blade span 41 and the second intermediate inter-blade span are each substantially equal to the trailing inter-blade span 42.
  • the first intermediate inter-blade span 41 is less than the leading inter-blade span 41 and greater than the second intermediate inter-blade span.
  • the second intermediate inter-blade span is equal to the trailing inter-blade span 42.
  • a leading inter-blade span that is closest to the leading longitudinal side of the razor cartridge is greater than a trailing inter-blade span that is closest to the trailing longitudinal side of the razor cartridge.
  • Figure 5b also illustrates a first debris run-off portion 46, a second debris run-off portion 47, and a third debris run-off portion 48.
  • the width of the debris run-off portions is defined by the relative spacing of the cutting members of the group of cutting members 29.
  • the first debris run-off portion 46 is wider than the second debris run-off portion 47, which in turn is wider than the third debris run-off portion 48.
  • An effect of this is that, in use, a greater amount of hair clippings and foam can be removed via the first (relatively wider) debris run-off portion 46. This reduces the risk of blockage of the debris run-off portions, particularly when the razor cartridge is used by infrequent shaver users, because the most troublesome debris can escape via the first (relatively wider) debris run-off portion 46.
  • Design of the size of the leading blade to frame span 44 and/or the trailing blade to frame span 45 is optional.
  • the leading blade to frame span 44 may be larger than, equal to, or smaller than the leading inter-blade span 40.
  • the trailing blade to frame span 45 may be larger than, equal to, or smaller than the trailing inter-blade span 42.
  • the leading inter-blade span 40 is greater than the trailing inter-blade span 42.
  • the first intermediate inter-blade span is equal to, or less than, the leading inter-blade span.
  • the first intermediate inter-blade span is equal to, or greater than, the trailing inter-blade span.
  • a razor cartridge with four blades 33a-d has been illustrated, the present specification also includes a razor cartridge comprising three blades, or greater than four blades.
  • five substantially parallel cutting members 28a-d may be disposed in a shaving direction of the razor cartridge 20, wherein a second intermediate inter-blade span is defined adjacent to the trailing inter-blade span 42.
  • first intermediate inter-blade span 41 and the second intermediate inter-blade span are each substantially equal to the leading inter-blade span.
  • first intermediate inter-blade span 41 and the second intermediate inter-blade span are each substantially equal to the trailing inter-blade span 42.
  • the first intermediate inter-blade span is less than the leading inter-blade span 40 and greater than the second intermediate inter-blade span.
  • the second intermediate inter-blade span is equal to the trailing inter-blade span 42.
  • consecutive inter-blade spans of the razor cartridge successively decrease between the leading longitudinal side 24 and the trailing longitudinal side 25 of the razor cartridge in the shaving direction.
  • each of the blade supports 32a-d comprises a shaving plane contact portion 58 that is configured, in use, to contact the shaving plane SH in addition to the cutting edges 30 of the blades, thereby reducing the pressure at each cutting edge contact point with the shaving plane. The pressure at the cutting edge contact points may therefore be reduced.
  • FIG 7 is a perspective cutaway view of an end of a cutting member 28.
  • the cutting member 28 is a sub-assembly comprising a longitudinal blade 33 mounted on a longitudinal blade support 32.
  • the lower portion of the blade support 60 is suitable for being held in the holding slots 34 of the frame 21 of the razor cartridge.
  • a bend 62 of the longitudinal blade support 32 defines an angle of approach of the longitudinal blade 33 to the shaving plane SH.
  • the approach angle A defines the angle of declination of the inner surface of the blade support 66 from the reference of the blade support 32.
  • A is an acute angle, preferably between 60 and 75 degrees, more preferably 68 degrees.
  • the longitudinal blade 33 comprises a cutting edge 30 capable of cutting hairs.
  • a rounded indent is cut from the sheet metal forming the blade support 32.
  • a blade is mounted on the outer surface of a blade support, such that in use, no part of the blade support comes into contact with shaving plane SH.
  • a blade mounting portion 71 of the blade support 32 is disposed on an inner surface of the respective blade support that, in use, faces away from a shaving plane SH, and a blade attached to the blade mounting portion 71 as shown in Figure 7 .
  • the blade 33 is mounted on an inner surface of the respective blade support and projects from underneath the inner surface defining a cutting edge to blade span 43 between a cutting edge 30 of the blade and the end of the blade support 32 towards the shaving plane SH.
  • both the cutting edge of the blade 30 and the end of the blade support 32 contact the shaving simultaneously, leading to a reduction in the force exerted on the shaving plane SH exerted by a single cutting edge, for example.
  • the position of a blade 33 on a blade support 32 when a cutting member 28a-d is mounted in the razor cartridge is defined by the fact that an imaginary tangent provided from the surface of the blade 33 that is directed away from the shaving plane SH does not pass through any point of the blade support 32 that the blade 33 is mounted on.
  • a further definition of the position of a blade 33 on the blade support is that when a cutting member 28a-d is mounted in the razor cartridge, an imaginary tangent provided from the portion of the blade 33 in contact with the blade mounting portion 71 that is directed towards the shaving plane SH in use passes through the blade support 32 that the blade 33 is mounted on.
  • Figure 8 is a perspective view of a longitudinal blade support member 32 without a blade. It comprises substantially elongated flat lower portion 60, a substantially elongated flat top side 65, and a radius bend portion 62.
  • the radius bend portion 62 may have an inner radius of curvature RO that is more than 0.1 mm.
  • the radius bend portion 62 may have an inner radius of curvature RO that is less than 0.9 mm.
  • a minimum recommended inner radius of curvature RO of sheet metal should be at least the same as its thickness T.
  • a safety factor of the thickness of the blade support 32 may be applied. By multiplying the safety factor with the preferable thickness of T (around 0.17 mm), the radius of curvature RO may be approximately 0.25 mm, preferably between 0.16 mm and 0.40 mm, and most preferably between 0.25 mm or 0.28 mm.
  • Figure 9 is a schematic side view of a cutting member 28 comprising a blade mounting portion 71 disposed on an inner surface of a blade support that, in use, faces away from a shaving plane SH.
  • the blade support 32 may be made from a flat sheet metal part which is bent before welding of the blade 33 on the inner surface 66 of the blade support 32.
  • the cutting member 28 thus comprises a blade 33 (razor blade).
  • the blade 33 has, in its flat portion, a thickness T1 about 0.1 mm (for example, between 0.04 and 0.11 mm).
  • the total length L2 of the blade 33 between the cutting edge 30 of the blade 33 and the opposite back edge of the blade 33 is about 1 mm (for example, between 0.8 mm and 1.3 mm).
  • the portion of the blade 33 that is in contact with the inner surface 66 of a blade support that, in use, faces away from a shaving plane SH has a length L1 that is about 0.49 mm +/- 0.1 mm long. In this way, a good retention of the blade on the underside of the blade support 32 (the inner surface of the blade support 32) is ensured.
  • the height of the cutting member 28 H is between 2.53 mm and 2.63 mm, preferably 2.58 mm.
  • the front end 72 of the blade support is rounded or chamfered to improve glideness properties of the cutting member.
  • the blade 33 may be positioned on the inner surface 66 of the blade support 32 to adjust the exposure E of the cutting edge 30 positively or negatively compared to the shaving plane SH.
  • the exposure is a measure of how prominently the cutting edge 30 of a blade protrudes above or sinks below the end 72 of its blade support.
  • the blade 33 may be positioned to have an exposure relative to the shaving plane SH in the range -80 um to +80 um, more preferably an exposure of about -75 um,
  • the length L3 of the cutting member 28, between the cutting edge 30 and the outer face of the lower portion of the blade support 32 is about 1.0 mm (for example, between 0.9 mm and 1.6 mm).
  • the blade 33 is fixed on the inner surface 66 of the blade support by any known means, such as by laser spot welding.
  • the blade 33 is fixed on the inner surface 66 of the blade support by a plurality of spot welds (for example, between ten and sixteen spot welds) distributed along the longitudinal dimension of the blade support 32.
  • spot welds may be performed on the inner face 70 of blade 33.
  • each of the spot welds may be carried out on the outer surface of the blade support 68, or a mixture of the two.
  • Figure 10 illustrates an example schematic side view of a group of cutting members 29 with inter blade spans in accordance with one exemplary implementation.
  • Figure 10 illustrates that the leading inter blade span 40 is greater than trailing inter-blade span 42.
  • the first intermediate inter-blade span 41 is smaller than the leading inter blade span 40 but greater than trailing inter-blade span 42, however this is not an essential feature.
  • the first intermediate inter-blade span 41 may be equal to either of the trailing inter-blade span 42 or the leading inter blade span 40.
  • inter-blade spans Specific measurements of the separation distance ranges inter-blade spans will now be discussed. A skilled person will appreciate that many choices and combinations of inter-blade spans may be made that satisfy the above-discussed features of the razor cartridge 20, and that the following discussion is not limited to the disclosed values.
  • leading inter blade span 40 is within a range of 1.6 mm to 2.2 mm, 1.70 mm to 2 mm, or 1.75 mm to 1.95 mm.
  • leading inter blade spans defined above may still apply, in combination with a trailing inter-blade span 42 in a range of 1.6 mm to 2.2 mm, 1.70 mm to 2.00 mm, or within 1.75 mm to 1.95 mm.
  • the trailing inter-blade span 42 is in a range of 1.6 mm to 2.2 mm, 1.70 mm to 2.00 mm, or within 1.75 mm to 1.95 mm.
  • leading inter blade span 40 is within a range of 1.7 mm to 2.2 mm, 1.8 mm to 2.0 mm, or is 1.85 mm.
  • the first intermediate inter blade span 41 is within a range of 1.55 mm to 1.95 mm, 1.60 mm to 1.80 mm, or is 1.70 mm.
  • the trailing inter-blade span 42 is within a range of 1.4 mm to 1.8mm, preferably 1.50 mm to 1.65 mm, or is 1.55 mm.
  • leading blade to frame span 44 is within a range of 0.4 - 1.0mm, 0.5mm to 0.8mm, or is 0.7 mm.
  • the trailing blade to frame span 45 is within a range of 1.7 mm to 2.2 mm, 1.8 mm to 2.0 mm, or is 1.85 mm.
  • any possibly combination of inter-blade spans is possible, provided a leading inter-blade span that is closest to the leading longitudinal side 24 of the razor cartridge is greater than a trailing inter-blade span that is closest to the trailing longitudinal side 25 of the razor cartridge.
  • the ranges discussed above are generally increased as compared to conventional razor cartridges.
  • the rinsability of a cartridge as discussed herein is generally improved, because more space is available between the cutting members 28a-d for debris to flow off closer to the leading edge of the razor cartridge 20.
  • the size of skin bulges is also reduced, resulting in an improved shaving performance.
  • the leading inter blade span 40 is larger compared to the first intermediate inter blade span 41 or the trailing inter-blade span 42, the first two blades that cut the highest amount of hair are far enough apart to ensure that the debris can be removed easily.
  • the remainder of the blades may have a narrower IBS to reduce the risk of nicks and cuts.
  • Providing the blade support "on top" of the blade provides an additional skin-contacting element (as well as the cutting edges 30 of the blades) which supports the skin during shaving.
  • Figure 11 illustrates a side view of a blade arrangement illustrating the reduction in skin bulging when enabling the blade support member to contact the skin during shaving.
  • Figure 12 illustrates a further side view of a blade arrangement illustrating the benefit of enabling the blade support member to contact the skin.
  • Figure 13 illustrates a method of manufacturing a razor cartridge according to a further aspect.
  • the method comprises:
  • FIG. 1 illustrates a shaving razor assembly 1 according to a further aspect.
  • the shaving razor assembly 1 comprises a razor handle 2 and a razor cartridge 20 according to the first aspect or one of its embodiments, wherein the razor cartridge is either releasably attached to the razor handle via a pivotable 8 or non-pivotable connection, integrally formed with the razor handle via a non-pivotable connection, or integrally formed with the razor handle via a pivotable connection.
  • kit of parts comprising a razor handle 2 and a razor cartridge holder comprising a plurality of razor cartridges razor cartridge 20 according to the first aspect or its embodiments.
  • a razor blade comprising at least three cutting members 28a-c according to the aspect may have fourth and fifth blades, according to specific embodiments.
  • the leading inter-blade span, the trailing inter-blade blade span, the first intermediate blade span, and where relevant the second inter-blade span are defined between the cutting edges 30 of the respective three, four, or five blades.
  • a first intermediate blade span, and second inter-blade span and not present.
  • a second intermediate inter-blade span it not present.
  • the leading inter-blade span, first and second intermediate inter-blade spans, and a trailing inter-blade span are present.
EP19177659.0A 2019-01-31 2019-05-31 Rasierklingeneinsatz Pending EP3744488A1 (de)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP19177659.0A EP3744488A1 (de) 2019-05-31 2019-05-31 Rasierklingeneinsatz
US17/426,295 US20220088809A1 (en) 2019-01-31 2020-01-30 Razor cartridge
MX2021007698A MX2021007698A (es) 2019-01-31 2020-01-30 Cartucho de maquinilla de afeitar.
PCT/EP2020/052239 WO2020157173A1 (en) 2019-01-31 2020-01-30 Razor cartridge
CN202080007359.5A CN113226675B (zh) 2019-01-31 2020-01-30 剃刀刀片架
BR112021012483-7A BR112021012483A2 (pt) 2019-01-31 2020-01-30 Cartucho com navalha
JP2021536830A JP2022519991A (ja) 2019-01-31 2020-01-30 かみそりカートリッジ
KR1020217019565A KR20210122230A (ko) 2019-01-31 2020-01-30 면도기 카트리지
EP20702022.3A EP3917730A1 (de) 2019-01-31 2020-01-30 Rasierkopf
US17/158,357 US11059193B2 (en) 2019-01-31 2021-01-26 Razor cartridge
IL283880A IL283880A (en) 2019-01-31 2021-06-10 Razor refill cartridge
US17/345,526 US20210370534A1 (en) 2019-01-31 2021-06-11 Razor cartridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19177659.0A EP3744488A1 (de) 2019-05-31 2019-05-31 Rasierklingeneinsatz

Publications (1)

Publication Number Publication Date
EP3744488A1 true EP3744488A1 (de) 2020-12-02

Family

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Application Number Title Priority Date Filing Date
EP19177659.0A Pending EP3744488A1 (de) 2019-01-31 2019-05-31 Rasierklingeneinsatz

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EP (1) EP3744488A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6041926A (en) * 1996-04-10 2000-03-28 The Gillette Company Dispensing razor blade cartridges used with a handle
US6212777B1 (en) * 1993-09-29 2001-04-10 The Gillette Company Safety razors
US20050015991A1 (en) * 2002-04-24 2005-01-27 Eveready Battery Company, Inc. Razor cartridge
WO2006027018A1 (en) 2004-09-07 2006-03-16 Bic-Violex Sa Razor handle and shaver including such a handle
US20090083982A1 (en) * 2007-09-28 2009-04-02 The Gillette Company Decreasing blade spans
US20110146079A1 (en) * 2009-12-18 2011-06-23 Sean Peter Clarke Razor Cartridge With Non-Cutting Element
WO2012158141A1 (en) * 2011-05-13 2012-11-22 Eveready Battery Company, Inc Razor Blade Supports

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6212777B1 (en) * 1993-09-29 2001-04-10 The Gillette Company Safety razors
US6041926A (en) * 1996-04-10 2000-03-28 The Gillette Company Dispensing razor blade cartridges used with a handle
US20050015991A1 (en) * 2002-04-24 2005-01-27 Eveready Battery Company, Inc. Razor cartridge
WO2006027018A1 (en) 2004-09-07 2006-03-16 Bic-Violex Sa Razor handle and shaver including such a handle
US20090083982A1 (en) * 2007-09-28 2009-04-02 The Gillette Company Decreasing blade spans
US20110146079A1 (en) * 2009-12-18 2011-06-23 Sean Peter Clarke Razor Cartridge With Non-Cutting Element
WO2012158141A1 (en) * 2011-05-13 2012-11-22 Eveready Battery Company, Inc Razor Blade Supports

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