razor cartridge

Abstract

A shaving razor cartridge comprising: a housing having a first level guard in front of the housing, a second level cap in back of the housing, and at least one spring member positioned between the first level guard and the second level cap; a bridge member positioned between the first level guard and the second level cap, the bridge member having a first level cap surface and a second level guard surface; a first blade having a cutting edge, the first blade mounted to at least one of the spring members between the first level guard and the first level cap surface; a second blade having a cutting edge, the second blade mounted to at least one of the spring members between the second level guard surface and the second level cap; an interblade span between the cutting edge of the first blade and the cutting edge of the second blade is 3 mm to 6 mm; wherein the shaving razor cartridge comprises only two blades.

Description

[0001] This application is a divisional application of the application filed on August 29, 2017, with international application number PCT / US2017 / 049080, Chinese application number 201780045785.6, entitled "Razor Blade Holder". Technical Field

[0002] The present invention relates to razors, and more particularly to a razor blade holder having two guards, two top caps, and a plurality of blades. Background Technology

[0003] Generally, wet shaving razors include a blade holder or blade unit having at least one blade with a cutting edge, which moves across the surface of the skin being shaved by means of a handle attached to the handle. The blade holder can be detachably mounted to the handle so that it can be replaced with a new blade holder when the blade sharpness has diminished to an unsatisfactory level, or permanently attached to the handle (i.e., a disposable razor) if it is desired to discard the entire razor when one or more blades have become dull. The connection between the blade holder and the handle provides pivoting fixation of the blade holder relative to the handle, allowing the blade holder angle to be adjusted to conform to the contours of the shaving surface. In such systems, the blade holder can be biased toward a rest position by the action of a spring-biased plunger (cam follower) carried on the handle and abutting against a cam surface on the blade holder housing.

[0004] Razor blade holders typically include a guard and a top cap. During shaving, the guard contacts the skin in front of one or more blades, and the top cap contacts the skin behind one or more blades. The top cap and guard help establish the so-called "shaving geometry," that is, parameters that determine the orientation and position of the blades relative to the skin during shaving, which in turn has a significant impact on shaving performance and razor effectiveness. The top cap and guard can also help establish blade exposure. Blade exposure is defined as the vertical distance or height of the blades relative to the front and rear of the adjacent blades, measured relative to a plane tangent to the skin contact surface of the blade unit element. Therefore, for a three-blade unit, the exposure of the first or first-stage blade is measured with reference to a plane tangent to the guard and the blades of the second blade, and the exposure of the third or third-stage blade is measured with reference to a plane tangent to the blades of the second blade and the top cap.

[0005] The minimum acceptable exposure can be influenced by other blade unit dimensions, such as the distance from the skin-contact surface of the guard to the blade edge, i.e., the "span" of the first-stage blade. As referred to herein, "span" means the distance between the blade edge and the skin-contact element directly in front of the blade edge, as measured along a tangent extending between the element and the blade. The guard may include a generally rigid guard strip that may be integrally formed with a housing or platform structure that provides support to the blade. The guard may also include a skin-stretching element made of various types of elastomeric materials, designed to stretch the skin and / or align hair in front of the blade.

[0006] Safety razors with blade holders have sold in large numbers in recent years and are generally considered to offer a better shave than single-blade razors, especially in terms of closeness, thanks to the multiple blades in the holder. A blade unit with many blades can produce a closer shave than a similar unit with only one or two blades. However, the closeness of the shave achieved is only one parameter that razor users use to judge a razor's performance. Comfort is another important feature to consider. For example, many consumers describe themselves as having sensitive skin that is prone to nicks, cuts, and irritation. Discomfort during shaving is often described by shaving users as a "pulling" sensation, caused by irritated nerves around the hair follicles. This nerve stimulation can occur due to moving, pulling, and / or cutting the hair, and can also occur due to dragging the razor blade holder across the skin's surface.

[0007] In addition, many consumers suffer from acne and / or pseudofolliculitis of the beard (PFB) that makes shaving uncomfortable. PFB, or shave bump, is an external inflammatory reaction of the body involving papules and pustules. It is a common skin condition that primarily affects adult men with naturally coarse or densely curly hair, especially those who regularly shave close to the face. The leading edge of the facial hair cut close to the face re-enters the epidermis of the skin or intersects with the follicle wall, causing a localized inflammatory reaction at the affected site. This process can lead to secondary skin infections and, in severe cases, permanent scarring. Therefore, what is needed is a razor blade holder that provides a more comfortable shave and / or reduces skin problems caused by shaving the face and body (e.g., PFB, irritation, redness, razor bumps, ingrown hairs, acne, etc.). Summary of the Invention

[0008] In one aspect, the invention is generally characterized by a razor blade holder with a housing having a first-stage guard at the front of the housing, a second-stage top cover at the rear of the housing, and at least one spring member positioned between the first-stage guard and the second-stage top cover. A bridging member is positioned between the first-stage guard and the second-stage top cover. The bridging member has a surface of the first-stage top cover and a surface of the second-stage guard. A first blade with a cutting edge is mounted to at least one of the spring members between the first-stage guard and the surface of the first-stage top cover. A second blade with a cutting edge is mounted to at least one of the spring members between the surface of the second-stage guard and the second-stage top cover. The bridging member has a pair of spaced-apart legs mounted on at least one of the spring members.

[0009] On the other hand, the invention is generally characterized by a method of assembling a razor blade holder by providing a housing having a first-level protective member and a second-level top cover. A first blade having a cutting edge is mounted to the housing. A second blade having a cutting edge is mounted to the housing. A bridging member having a pair of spaced-apart legs is mounted to the housing directly between the first and second blades. The first blade, the second blade, and the bridging member are secured to the housing using at least one clamp.

[0010] On another front, the invention is characterized by a bridging member for a razor blade holder, the bridging member having a pair of generally parallel, spaced-apart legs configured for mounting within a pair of corresponding blade slots in a blade holder housing. An upper surface extends across the legs. The upper surface has a width of 1.5 mm to 4 mm.

[0011] Details of one or more embodiments of the invention are set forth in the accompanying drawings and description below. Other features and advantages of the invention will become apparent from the description and drawings and from the claims. Attached Figure Description

[0012] Figure 1 This is a top view of the razor blade holder.

[0013] Figure 2 For roughly along Figure 1 The cross-sectional view of the razor blade holder taken from line 2-2.

[0014] Figure 3A To be able to combine Figure 1 A perspective view of a possible implementation of the bridging member in a razor blade holder.

[0015] Figure 3B To be able to combine Figure 1 A perspective view of another possible implementation of the bridging member in the razor blade holder.

[0016] Figure 3C To be able to combine Figure 1 A perspective view of another possible implementation of the bridging member in the razor blade holder.

[0017] Figure 4 for Figure 1 Assembly diagram of the razor blade holder.

[0018] Figure 5 for Figure 1 A schematic diagram of a razor blade holder. Detailed Implementation

[0019] refer to Figure 1 The image shows a top view of a razor blade holder 10. The razor blade holder 10 may include a housing 12 having a first-stage guard 14 facing forward of the housing 12 and a second-stage top cover 16 facing rearward of the housing 12. In some embodiments, a first blade 18 and a second blade 20 may be present between the first-stage guard 14 and the second-stage top cover 16, mounted to the housing 12. Each of the blades 18 and 20 may have corresponding cutting edges 22 and 24 facing the same direction (e.g., towards the first-stage guard 14). The blades 18 and 20 may be rigidly fixed to the housing 12 such that the blades 18 and 20 do not move relative to the housing 12 during a shaving stroke, or the blades 18 and 20 may be spring-loaded.

[0020] A bridging member 26 may be positioned between the first blade 18 and the second blade 20. The bridging member 26 may have a first-stage cap surface 28 and a second-stage guard surface 30. Thus, the first-stage guard 18 and the first-stage cap surface 28 may create a shaving plane for the first cutting edge 22. Similarly, the second-stage guard surface 30 and the second-stage cap 16 may create a shaving plane for the second cutting edge 24. In some embodiments, the second-stage guard surface 30 and the first-stage cap surface 28 may be a single integral component. The bridging member 26 may be a separate component mounted to the housing 12. The bridging member 26 may comprise a metal, such as aluminum, copper, or stainless steel.

[0021] Blades 18 and 20, and bridging member 26, can be secured to housing 12 using at least one clamp 32a and 32b, which is bent around a portion of housing 12. While clamps 32a and 32b are shown as two separate components securing blades 18 and 20 and bridging member 26 to housing 12, clamps 32a and 32b can also be a single, integrated design. Furthermore, clamps 32a and 32b do not necessarily need to be bent or shaped around a portion of housing 12 to secure blades 18 and 20 and bridging member 26 relative to housing 12. For example, clamps 32a and 32b can be snap-fitted, pressure-fitted, adhesively bonded, or ultrasonically welded to housing 12. Clamps 32a and 32b can comprise metal (e.g., aluminum or stainless steel) or polymeric materials (e.g., Noryl). TM(a blend of polyphenylene oxide (PPO) and polystyrene developed by General Electric Plastics, now SABIC Innovative Plastics), acrylonitrile butadiene styrene (ABS), acetal, polypropylene, high-impact polystyrene, or any combination thereof. Clamps 32a and 32b can contact the cutting edges 22 and 24 of the corresponding blades 18 and 20 to establish a shaving plane.

[0022] In some embodiments, clamps 32a and 32b may not contact the first-stage cap surface 28 and / or the second-stage guard surface 30 to facilitate proper positioning of the first-stage cap surface 28 and the second-stage guard surface 30 relative to the cutting edges 22 and 24. For example, if clamps 32a and 32b extend above or around the bridging member 26, they can prevent proper skin and hair contact with the cutting edges 22 and 24 because they are positioned above the first-stage cap surface 28 and the second-stage guard surface 30. Furthermore, the position of the bridging member 26 will be limited by the thickness of clamps 32a and 32b.

[0023] Unbound by theory, it is believed that it is possible to minimize skin irritation and PFB by cutting hair close to the skin level but not below the skin surface. Multi-blade razor blade holders utilize an effect known as the hysteresis effect. Hysteresis is the metastable extension of the hair that occurs during shaving after the hair has been cut. In modern razors, the sharp cutting edges of the blade holder engage individual hairs during the shaving stroke, applying force to the hair and causing it to be lifted from the follicle as the razor moves across the skin's surface. Once the hair is cut and the force is removed, the hair retracts into the skin. However, in multi-blade systems, the follower blade (i.e., the second blade) engages the hair and cuts it before it is able to retract into the skin. This concept of cutting the hair with the follower blade before it is fully retracted into the skin is called "hysteresis cutting." If both the second and follower blades engage and pull the hair during cutting, it is possible to achieve a significantly closer cut compared to using a single-blade razor.

[0024] In razor blade holders with multiple closely spaced blades, it is possible for a single hair to engage with more than one blade during a single cutting phase, thus exponentially increasing nerve stimulation and discomfort. Blades with less close spacing are less likely to engage the same hair during a single cutting phase and are therefore less likely to exacerbate nerve stimulation and discomfort. Without being bound by theory, it is believed that reducing the likelihood of a single hair engaging with multiple blades during the cutting phase can reduce uncomfortable nerve stimulation. Furthermore, reducing the likelihood of a single hair engaging with multiple blades during the cutting phase can also help prevent hair from being cut too close to the skin or below the skin's surface, which limits the re-entry of growing hair into the epidermis.

[0025] refer to Figure 2 It shows roughly along Figure 1 A cross-sectional view of the razor blade holder 10 taken from line 2-2. The first-stage guard 14 may have a width “W1” of approximately 0.35 mm to approximately 0.85 mm. Compared to a typical shaving system, the bridging member 26 provides sufficient spacing between the two cutting blades 22 and 24 to allow hair to retract further into the hair follicle. The greater the spacing between the cutting blades 22 and 24, the longer the time for hair retraction. The second cutting blade 24 may not cut the same hair as the first cutting blade 22, but only any hair missed by the first cutting blade 22. In some embodiments, the inter-blade span “S1” between the cutting blade 22 of the first blade 18 and the cutting blade 24 of the second blade 20 may be approximately 3 mm to approximately 6 mm. For example, the inter-blade span “S1” between the cutting blade 22 of the first blade 18 and the cutting blade 24 of the second blade 20 may be greater than 4.2 mm to provide sufficient spacing for a more comfortable shave. The blade span “S1” between the cutting edge 22 of the first blade 18 and the cutting edge 24 of the second blade 20 may be greater than the span “S2” between the first-level guard 14 and the cutting edge 20 of the first blade 18. The blade span “S1” between the cutting edge 22 of the first blade 18 and the cutting edge 24 of the second blade 20 may also be greater than the span “S3” between the surface 28 of the second-level guard and the cutting edge 24 of the second blade 20. In some embodiments, the blade span “S1” may be about 6 to about 12 times the spans S2 and / or S3. The blade span S1 helps minimize double engagement of the hair, which can lead to discomfort and the hair being cut below the skin surface.

[0026] Blades 18 and 20 may have corresponding blade support members 38 and 36. The support members may be integral with blades 18 and 20, or alternatively, blades 18 and 20 may be mounted and secured (e.g., welded) to the corresponding blade support members 36 and 38. Blade support members 36 and 38 may be positioned within corresponding blade slots 40 and 42 of housing 12. Bridging member 26 may include a pair of spaced-apart legs 44 and 46 extending transversely to bridging member 26. Housing 12 may have a plurality of blade slots 48, 50, and 52 between blades 18 and 20. The spaced-apart legs 44 and 46 may be positioned within blade slots 50 and 52, respectively. The spaced-apart legs 44 and 46 may provide improved stability of bridging member 26 during shaving strokes, especially when the size of bridging member 26 increases (e.g., width in the front-to-back direction). A single-leg bridging member is more likely to tip over or flip within the housing 12 during the shaving stroke because the force balance is not as good as that of a bridging member 26 with two spaced-apart legs 44 and 46. Furthermore, the two legs 44 and 46 distribute shaving force better across the housing 12 than a single leg. The bridging member 26 may be spaced apart from the first blade 18 (and blade support member 38) to define a rinsing gap 39 between them. The rinsing gap 39 facilitates the removal of shaving debris (e.g., cut hair and / or shaving preparation). Therefore, less shaving debris can be present when the second blade 20 engages and cuts the hair, resulting in a more efficient and comfortable shave. The spaced-apart legs 44 and 46 allow for improved spacing of the bridging member 26. In some embodiments, the leg spacing may be smaller than the overall width of the bridging member 26, which allows for improved rinsing. For example, if legs 44 and 46 are spaced apart by the same distance as the bridging member 26, shavings are more likely to be trapped between legs 46 and blade support member 38. Legs 44 and 46 may be spaced apart by about 1 mm, for example, 0.5 mm to 1.5 mm.

[0027] The blade slot 48 between the second blade 20 (or blade support 36) and the bridging member 26 may be open (i.e., no part may be located within the blade slot 48). In some embodiments, the bridging member 26 may overlap the open blade slot 48. Typical multi-blade razor housings utilize blade slots that receive blades and / or blade support members. The bridging member 26 allows for a more comfortable shaving without designing or manufacturing a new housing that utilizes the same housing and provides a larger skin support area between the blade 18 closest to the first stage guard 14 and the blade 20 closest to the second stage top cover 16. For example, housing 12 may be the same housing as that used for a five-blade razor razor housing, but only requires the bridging member 26 and two blades 18 and 20.

[0028] In some embodiments, the first-stage top cover surface 28 and the second-stage protective surface 30 of the bridging member 26 may advantageously be positioned above the cutting blades 22 and 24, which may be preloaded against the bottom surface 34b of the corresponding clamp 32b. The first-stage top cover surface 28 and the second-stage protective surface 30 of the bridging member 26 may be positioned on plane P1 between the top surface 33b and the bottom surface 34b of the corresponding clamp 32b. Although Figure 2 Only one clamp 32b is shown, but it should be understood that clamp 32a may also have a corresponding top surface 33a and bottom surface 34a (e.g., Figure 4 (as shown), and the bridging member 26 can be installed in a similar manner to the clamp 32b.

[0029] The bridging member 26 may have a width “W2” to facilitate a proper shaving geometry to minimize double engagement of the hair and prevent the hair from being cut below the skin surface. The width “W2” may be measured (in a front-to-back direction) as the overall width of the bridging member 26, which is measured at a plane P2 tangent to the cutting blades 22 and 24 (e.g., at the bottom surface 34b of the clamp 32b). In some embodiments, W2 may be from about 1.75 mm to about 4 mm, preferably from about 2 mm to about 3 mm. The width of the bridging member 26 can facilitate establishing a proper shaving geometry and preventing the hair from being cut below the skin surface. For example, the width W2 of the bridging member 26 can facilitate sufficient spacing between the cutting blades 22 and 24 to allow the hair to retract into the hair follicle after being cut by the cutting blade 22 of the first blade 18 and before being engaged by the cutting blade 24 of the second blade 20. Furthermore, the width and spacing of the bridging members 26 can reduce double engagement of hair (e.g., when both cutting blades 22 and 24 engage the same hair simultaneously). As the blade span S1 increases, the skin protrusion between cutting blades 22 and 24 can also increase, which can lead to increased scratches and cuts. The width of the bridging members 26 provides improved skin support to minimize the skin protrusion that can cause scratches, cuts, and discomfort, especially as the blade span S1 increases.

[0030] In some embodiments, the width W2 of the bridging member may be greater than 45% of the inter-blade span S1. For example, the width W2 of the bridging member may be from about 50% to about 75% of the inter-blade span S1. Therefore, if the inter-blade span S1 is 4.0 mm, the width W2 of the bridging member 26 may be greater than 2.0 mm. In some embodiments, the width W2 of the bridging member may be from about 60% to about 70% of the inter-blade span S1. A wider bridging member 26 provides increased skin support, which results in a more comfortable shave by reducing skin protrusion, while also minimizing double engagement and hysteresis of hair.

[0031] refer to Figure 3A The diagram shows a perspective view of the bridging member 26. The bridging member 26 may have a front edge 62 and a rear edge 64. In some embodiments, the front edge 62 and / or the rear edge 64 may overlap the corresponding legs 44 and 46 to provide sufficient spacing between the blades 18 and 20, while also allowing the bridging member 26 to fit within the housing 12 (e.g., Figure 2 (As shown). Each of the legs 44 and 46 may have a corresponding top surface 54 and 56. The top surfaces 54 and 56 may be recessed below the upper surface 58 to provide for mounting. Figure 1 The areas of clamps 32a and 32b. Therefore, when clamps 32a and 32b are secured to housing 12, clamps 32a and 32b can be at approximately the same height as the upper surface 58 of bridging member 26, thereby providing a more uniform surface for razor blade holder 10, such as Figure 2 As shown. Legs 44 and 46 may be separate components mounted to bridging member 26, or they may be manufactured as integral components with bridging member 26. The first-stage top cover surface 28 and the second-stage protective surface 30 may be arcuate to provide a comfortable skin-supporting surface. Bridging member 26 may have an upper surface 58 extending across legs 44 and 46. The upper surface 58 between the first-stage top cover surface 28 and the second-stage protective surface 30 may be generally flat. A flat upper surface 58 allows for branding on bridging member 26. For example, a logo 60 may be positioned on upper surface 58 by machining, etching, molding, brushing, etc. It should be understood that although bridging member 26 is shown as a flat rectangular shape, many other shapes are possible, such as rounded surfaces.

[0032] In some embodiments, the first-stage cap surface 28, the second-stage guard surface 30, and / or the upper surface 58 may have a coefficient of friction less than that of the first-stage guard 14. For example, the first-stage cap surface 28, the second-stage guard surface 30, and / or the upper surface 58 may have a glossy surface (e.g., polished with 6000 to 1200 grit diamond paste) to improve slippage during the shaving stroke. The bridging member 26 (i.e., the second-stage guard surface 30 and / or the upper surface 58) may be coated (p-xylene or PTFE) or plated (e.g., chrome-plated) to improve lubricity. Alternatively, the first-stage cap surface 28, the second-stage guard surface 30, and / or the upper surface 58 may have a very rough surface to provide skin exfoliation during the shaving stroke (e.g., 600 grit sandpaper or less). The first-stage top cover surface 28, the second-stage protective surface 30, and the upper surface 58 can be made of anodized aluminum to improve lubrication and provide color options for the bridging member 26. The bridging member 26 can be made of various metals (e.g., stainless steel, copper, or aluminum) by wire EDM, machining, or stamping.

[0033] refer to Figure 3BA perspective view of a second possible embodiment of the bridging member 26b is shown. The bridging member 26b may replace... Figure 1 and Figure 2 The bridging member 26 in the razor blade holder 10. For example, the bridging member 26b can be inserted into the housing 12, as per [reference to...]. Figure 2 The bridging member 26b is described in the text. The bridging member 26b may include a pair of legs 44b and 46b having respective top surfaces 54b and 56b. Legs 44b and 46b may be interconnected by a top surface 27b. Legs 44b and 46b may be separate components, or they may be manufactured as integral components with the top surface 27b. The top surface 27b may define an opening 29b configured to receive a lubricating member 31b. The opening 29b may be a recess or extend fully through the top surface 27b. The lubricating member 29b may include an injection-molded, extruded, or hot / ultrasonic compressed water-soluble shaving aid. The lubricating member 29b may provide a first-stage top cap surface 28b and a second-stage guard surface 30b. Thus, the lubricating member 29b may be positioned in front of one or more blades (e.g., ...). Figure 2 The blade 20) and the back (e.g., Figure 2 The blade 18) provides lubrication, which reduces irritation or eliminates the need for shaving preparations. The first-stage cap surface 28b and / or the second-stage guard surface 30b may be arcuate to provide a comfortable skin-supporting surface. The bridging member 26b may have an upper surface 58b between the first-stage cap surface 28b and the second-stage guard surface 30b. The upper surface 58b may allow branding on the bridging member 26b, as previously described above.

[0034] Legs 44b and 46b may have corresponding top surfaces 54b and 56b, which are recessed below the upper surface 58b to provide areas for mounting clamps 32a and 32b, such as Figure 1 As shown. Therefore, when clamps 32a and 32b are secured to housing 12, clamps 32a and 32b may be at approximately the same height as the upper surface 58b of bridging member 26b, thereby providing a more uniform surface for razor blade holder 10. Bridging member 26b may have a width “W3” of approximately 1.5 mm to approximately 4 mm from the front edge 62b to the rear edge 64b. The width W3 of bridging member 26b allows for a suitable shaving geometry to minimize double engagement of hair and prevent hair from being cut below the skin surface. In some embodiments, bridging member 26b may be 3 to 5 times the width of primary guard 14. In some embodiments, bridging member 26 may have one or more notches 65b, 67b, and 69b to provide clearance for various housing structures. For example, notches 65b and 69b may allow clearance for spring members 62, 64, 66, 68, 60, 72, 74, 76, 78, and 70 (shown in...). Figure 4(in the middle), and the notch 67b can provide a gap for the central blade support 75 in the housing 12 (shown in the middle). Figure 4 (middle). Although only notches 65b, 67b and 69b are shown in the view shown, it should be understood that the other side of the bridging member 26b may have a similar notch.

[0035] refer to Figure 3C A perspective view of another possible embodiment of bridging member 26c is shown. Bridging member 26c can replace Figure 1 and Figure 2 The bridging member 26 in the razor blade holder 10. For example, the bridging member 26c can be inserted into the housing 12, as per [reference to...]. Figure 2 The bridging member 26 is described in the diagram. The bridging member 26c may include a pair of legs 44c and 46c having corresponding top surfaces 54c and 56c. The legs 44c and 46c may be interconnected by a plurality of spaced-apart parallel ribs 27c. The legs 44c and 46c may be separate components, or they may be manufactured as integral components with the plurality of spaced-apart parallel ribs 27c. The plurality of spaced-apart parallel ribs 27c provide a first-level top cover surface 28c and a second-level protective surface 30c. The ribs 27c may have an upper surface 58c between the first-level top cover surface 28c and the second-level protective surface 30c.

[0036] The top surfaces 54c and 56c of legs 44c and 46c may be recessed below the upper surface 58c to provide for mounting. Figure 1 The areas of clamps 32a and 32b. Therefore, when clamps 32a and 32b are secured to housing 12, clamps 32a and 32b can be at approximately the same height as the upper surface 58c of bridging member 26c, thereby providing a more uniform surface for the razor blade holder 10. Bridging member 26c can have a width “W4”. The width “W4” can be... Figure 2 and Figure 3AThe width “W2” shown is measured in the same way. The width “W4” can be measured (in the front-to-back direction) as the overall width of the bridging member 26, which is measured at the plane P2 tangent to the cutting blades 22 and 24 (e.g., at the bottom surfaces 34a and 34b of the clamps 32a and 32b). The width of the bridging member 26c allows for a suitable shaving geometry to minimize double engagement of hair and prevent hair from being cut below the skin surface. In some embodiments, the bridging member 26c may be 3 to 5 times the width of the first-level guard 14. A plurality of spaced parallel ribs 27c may define a rinsing opening 29c between them to help remove cut hair and excess shaving agent or soap. In some embodiments, the bridging member 26 may have one or more notches 65c, 67c, and 69c to provide clearance for various housing structures. For example, notches 65c and 69c may allow clearance for spring members 62, 64, 66, 68, 60, 72, 74, 76, 78, and 70 (shown in...). Figure 4 (in the middle), and the notch 67c can provide a gap for the central blade support 75 in the housing 12 (shown in the middle). Figure 4 (middle). Although only notches 65c, 67c and 69c are shown in the views shown, it should be understood that the other side of the bridging member 26c may have a similar notch.

[0037] refer to Figure 4 The diagram shows an assembly of the razor blade holder 10. Blades 18 and 20 can each be mounted on a pair of corresponding spring members 62, 64 and 66, 68 of the housing 12. A bridging member 26 can be mounted on a plurality of spring members 70, 72, 74, 76, 78 and 79. Figure 3B and Figure 3C The notches 65b, 69b, 65c, and 69c shown allow for clearances to be provided for spring members 70, 72, 74, 76, 78, and 79, thus enabling the bridging member 26 to be installed at an appropriate height. Furthermore, Figure 3B and Figure 3CThe notches 67b and 67c shown provide clearance for the central blade support 75 of the housing 12. Clamps 32a and 32b can be mounted above the blades 18 and 20 and the bridging member 26 (e.g., the top surfaces 54 and 56 of the legs 44 and 46 of the bridging member 26). Although the bridging member 26 is shown, it should be understood that bridging members 26b and 26c may be used alternatively. Clamps 32a and 32b can then be secured to the housing 12. Spring members 62, 64 and 66, 68 abut against clamps 32a and 32b (e.g., the bottom surfaces 34a and 34b of clamps 32a and 32b) to lift the blades 18 and 20. Similarly, spring members 70, 72, 74, 76, 78, and 79 abut against clamps 32a and 32b to lift the bridging member 26. In some embodiments, the bridging member 26 can move independently of the blades 18 and 20 and the housing 12 because the bridging member 26 is mounted on its own spring members 70, 72, 74, 76, 78, and 79. Independent movement of the bridging member 26 provides a more comfortable shave because it allows the bridging member to adjust according to the applied force during the shaving stroke. Furthermore, a pair of legs 44 and 46 improve the stability of the bridging member 26. In some embodiments, the bridging member 26 may be supported by six spring members 70, 72, 74, 76, 78, and 79, rather than by only two spring members as in the case of the blades 18 and 20. Therefore, the bridging member 26 can better distribute the shaving load. As previously mentioned, the bridging member 26 can be positioned below the top surfaces of the clamps 33a and 33b and above the top surfaces 33a and 33b of the clamps 32a and 32b.

[0038] refer to Figure 5 , showed Figure 1 A schematic diagram of the razor blade holder 10. Another factor (which can affect the drag associated with the blade) is the blade tangent angle, or BTA. The razor blade holder 10 may have a first shaving plane 80 tangent to the first stage guard 14 and the first stage top cover surface 28. The first shaving plane 80 may intersect the blade plane 82 of the first blade 18 (i.e., cutting edge 22) at a first blade tangent angle β1. The razor blade holder 10 may have a second shaving plane 84 tangent to the second stage guard surface 30 and the second stage top cover 16. The second shaving plane 84 may intersect the second blade plane 86 of the second blade 20 (i.e., cutting edge 24) at a second blade tangent angle β2. For the razor blade holder 10, a lower blade tangent angle results in a more comfortable shave. In some embodiments, the first blade tangent angle β1 may be about 15 degrees, for example, 10 to 25 degrees. It is not necessary for blades 18 and 20 to both have the same blade tangent angle. For example, the tangent angle β2 of the second blade may be smaller than the tangent angle β1 of the first blade 18, for example, by about 10 degrees.

[0039] The dimensions and values ​​disclosed herein should not be construed as strictly limited to the precise numerical values ​​cited. Rather, unless otherwise specified, each such dimension is intended to represent the stated value and the range around which it is functionally equivalent. For example, a dimension disclosed as “40 mm” is intended to represent “about 40 mm”. Furthermore, dimensions should not be maintained to an impossibly high standard of metaphysical identity, which does not take into account differences arising from typical manufacturing tolerances. Therefore, the term “about” should be understood as being within the range of typical manufacturing tolerances.

Claims

1. A razor blade holder (10), the razor blade holder comprising: The housing (12) has a first-level protective member (14) in front of the housing, a second-level top cover (16) in rear of the housing, and at least one spring member (62, 64, 66, 68, 70, 72, 74, 76) positioned between the first-level protective member and the second-level top cover. A bridging member (26) is positioned between the first-level protective member and the second-level top cover, the bridging member having a first-level top cover surface (28) and a second-level protective member surface (30). A first blade (18) having a cutting edge (22) is mounted to at least one of the spring members between the first-stage protective member and the surface of the first-stage top cover; A second blade (20) having a cutting edge (24) is mounted to at least one of the spring members between the surface of the second-stage protective member and the second-stage top cover; The inter-blade span (S1) between the cutting edge (22) of the first blade (18) and the cutting edge (24) of the second blade (20) is 3 mm to 6 mm; The razor blade holder described herein comprises only two blades; The razor blade holder also includes at least one clamp (32a, 32b) for securing the first blade (18) and the second blade (20) to the housing (12), wherein the upper surface (58) of the bridging member (26) is positioned on a plane (P1) between the top surface (33a, 33b) of the at least one clamp (32a, 32b) and the bottom surface (34a, 34b) of the at least one clamp (32a, 32b).

2. The razor blade holder (10) according to claim 1, wherein the first-stage top cover surface (28) and the second-stage protective surface (30) are arcuate, and the upper surface (58) between the first-stage top cover surface (28) and the second-stage protective surface (30) is substantially flat.

3. The razor blade holder (10) according to claim 1 or 2, wherein the bridging member (26) comprises a plurality of spaced parallel ribs (27c) having an upper surface (58c) between the first-stage top cover surface and the second-stage guard surface.

4. The razor blade holder (10) according to claim 3, wherein the plurality of spaced-apart parallel ribs (27c) define a rinsing opening (29c).

5. The razor blade holder (10) according to claim 1 or 2, wherein the first blade (18) includes a blade support member (38), and the bridging member (26) is spaced apart from both the first blade and the blade support member to define a rinsing gap (39).

6. The razor blade holder (10) according to claim 1 or 2, wherein the width (W2) of the bridging member is 3-5 times the width (W1) of the first-level protective member (14).

7. The razor blade holder (10) according to claim 1 or 2, wherein the inter-blade span (S1) between the cutting edge (22) of the first blade (18) and the cutting edge (24) of the second blade (20) is greater than the span (S2) between the first-level guard (14) and the cutting edge (22) of the first blade (18).

8. The razor blade holder (10) according to claim 1 or 2, wherein the inter-blade span (S1) between the cutting edge (22) of the first blade (18) and the cutting edge (24) of the second blade (20) is greater than the span (S3) between the surface (30) of the second-level guard and the cutting edge (24) of the second blade (20).

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