MXPA96005747A - Machine for afei - Google Patents

Abstract

The present invention relates to a secure unit for blades of a razor comprising a protection, a cover and first, second and third blades with sharp parallel edges located successively between the guard and the cover, at least one element selected from the three sheets, the protection and the lid can be moved from a non-shaved position to modify the exposure dimension of the sheet unit and achieve a modified sheet geometry, characterized in that the exposure of the first sheet is not greater than zero and the exposure of the third sheet is not less than zero, at least one of the first and third sheet has a different exposure when the at least one moving element is in the non-shaving position

Description

SHAVING MACHINE DESCRIPTION OF THE INVENTION and **. This invention relates to razors and is particularly related to razors having blade units with a plurality of blades defining sharp parallel edges arranged or distributed to pass in succession on a surface of the skin that is shaved. The invention is applicable to shaving machines having their blade units permanently affixed to the shaving sleeve, and to shaving machines which have their blade units mounted detachably on the sleeve for replacement when the edges of the shaving units are fixed. hojan have come to lose the edge, and in any case the invention can be incorporated if the blade unit is mounted without being movable to the sleeve, or mounted to move, for example, to pivot about an axis parallel to the axis. the edges of the blade, in relation to the sleeve under the influence of the forces imparted on the unit of the blades during shaving. The present invention has specific reference to razor blade units incorporating three blades, and to the relative positioning of the edges of the blades. The prior patent application No. PCT / US94 / 10717 of this same applicant teaches that with such blade units a total shaving operation can be achieved, 5 improved, when the edges of the blades are placed REF: 23442 «• adjusted according to a particular geometric configuration, especially with the first sheet, which has its edge closest to the protection device, which has an exposure not greater than zero, and the third sheet, which defines the edge closest to the lid, which has an exposure of not less than zero. In the most effective geometric arrangement, the first sheet or the main sheet has a negative exposure with an absolute value in the range of 0 to 0.2 mm, preferably equal to about -0.04 mm for a spread of the main sheet of about 0.7 mm, the third sheet has an exposure with a positive value no greater than about +0.3 mm (preferably less than +0.2 mm), for example about +0.6 mm or +0.09 mm, and the second sheet has an exposure of about zero, the extensions of the second and third sheets are each 1.0 to 2.0 mm, preferably approximately 1.5 mm. For reasons of convenience, the geometric arrangements described and claimed in the aforementioned prior application 0 are referred to herein as "the target geometry or objective for the sheets". For information and additional details of the geometry of the sheet, reference can be made to the previous application, the content of which is incorporated herein by this reference. 5 The exposure of the sheet is defined so that, "is the distance or perpendicular height of the edge of the sheet measured with respect to a plane tangential to the contact surfaces with the skin of the elements of the sheet unit immediately in front and immediately below the edge of the sheet 5. This can be a positive number if the edge of the sheet is above this plane, that is, closer to the surface of the skin to be shaved than the tangential plane, or a negative number if the __ edge of the sheet is below this tangential plane, it is say, moving farther away from the skin than the tangent plane. The extension of a sheet is the distance from the edge of the sheet to the contact element with the skin immediately opposite this edge when measured along and tangent to the line extending between the element and the edge of the sheet. The three-blade geometry specified above is applicable to a blade unit in which the blades are mounted immovably relative to the protection device and the lid. It also applies to the initial geometry or the remaining geometry in the case of a blade unit in which the blades are mounted elastically and are capable of being flexed under the forces applied to the blades during shaving. The present invention, recognizes that it may be desirable for some parts of a unit of the leaves, / "*" to be movable relative to the other parts and that they can be accommodated without losing the advantages of the geometry of the sheet described above. Accordingly, according to a preferred embodiment of the pre-5 sat invention, there is provided a razor blade unit comprising a protection device, a lid, and first, second and third blades with sharp parallel edges located in sequence between the protection device and the cover, at least one selected element 0 of the sheets, the protection device and the cover that is movable from a non-shaved position to modify an exposure dimension of the sheet unit sheet and to achieve a modified leaf geometry wherein the exposure of the first sheet no. 5 is greater than zero and the exposure of the third sheet is not less than zero, at least one of the First and third sheets having a different exposure when at least one movable element is in the non-shaved position. The at least one element can be polarized 0 or biased slightly, such as by means of a spring, to an initial, unshaved position, in which the target or target geometry of the blades does not apply, but when the unit the blade is applied to the skin during shaving, at least one element can be moved to a position in which the geometry of the target or target is achieved, the at least one element can comprise the protection device and / or the lid and / or one or more of the sheets In accordance with another aspect, the present invention provides a razor blade unit comprising a protection device, a lid and a plurality of blades with sharp edges. Parallels located in succession between the protection device and the cover, at least one of the protection device and the cover is movable against a spring force from a non-shaved position to an operable position. redetermined in which a geometry of the modified sheet is obtained, in the unshaved position the edges of the sheets are placed below a tangential plane 5 to the contact surfaces with the skin of the protection device and the cover. A complete understanding of the invention will be gained or obtained from the following detailed description in which reference is made to the appended drawings, or in which: Figure 1 illustrates a preferred blade geometry during shaving and corresponding to the Figure 2 of the previous application No. PCT / US94 / 10717; Figure 2 is a cross-sectional view through a first embodiment of the present invention when not in use; Figure 3 shows the sheet unit of Figure 2 with the parts occupying different relative positions; Figures 4 and 5 are views corresponding to Figures 2 and 3, respectively and showing a second embodiment of the invention; and Figures 6 and 7 are views corresponding to Figures 2 and 3 and illustrating a third embodiment of the invention. Figures 8-10 are illustrations of different orientations of a cartridge with respect to a person's skin. Figure 11 is a cross-sectional view through a further embodiment showing the use of cantilever beam arms for elastic or flexible mounting of the blades. Figure 1 illustrates schematically a razor blade unit having a frame or structure 1 having a frame or structure 1 defining a protection device 2 and a cover 3 and the assembly of a lubricating strip 4. Supported by the frame or structure and carried by the respective support elements are a primary leaf 11, a secondary leaf 12 and a tertiary leaf 13, the leaves having their edges resting or resting on a common plane P. The geometry of the unit of the sheet is as follows: a) The extension S, of the primary sheet 11 is 0.5 to 1.5 mm, and is preferably 0.7 mm; b) The extension S ~ of the secondary sheet 12 and the extension S "of the tertiary sheet 13 are in the range of 1.0 to 2.0 mm, and each one is preferably 1.5 mm; c) The distance S, from the edge of the tertiary blade to the lid is approximately 1.80 mm; d) The exposure of the primary sheet is -0.04 mm; e) The exposure of the secondary sheet 12 is not less than the exposure of the primary sheet 11 and no greater than the exposure of the tertiary sheet 13 and, as shown, is equal to zero; f) The exposure of the tertiary sheet is approximately +0.09 mm. Unless stated otherwise, the embodiments of the present invention described below are arranged so that a substantially similar blade geometry can be achieved even if such geometry does not apply when the blade unit is at rest and not in use. In the blade unit shown in Figures 2 and 3, the protection device 2 is mounted to the structure for sliding movement upwards and "• *" "downwards between the upper and lower extreme positions defined by the surfaces of stop or retainer provided on the structure The protection device is pushed slightly to the upper end position by a spring 20. The cover 3 is similarly mounted in a sliding manner by the structure for upward and downward movement between the extreme positions defined by the stops or detents, and a spring 21 slightly biases the cover to its upper end position In the upper end position of the protection device a projection 30 turned upwards on the protection device abuts butt with a defined upper surface 31 by a projection 32 integral with the structure, as seen in figure 2. Similarly, in the position In the upper end of the lid, a projection 34 turned upwards on the lid makes butt contact with a stop surface or retainer 35 defined by a projection 36 integral with the structure. In the lower end positions of the protection device and the cover, the protection device and the cover respectively abut the stop or retainer surfaces 37 and 38 defined by a lower wall portion of the structure, as shown in FIG. Figure 3. The three blades 11, 12, 13 can be mounted stationary in the frame or can be deflected by respective springs against a stop surface or retainer 18 defined by projections turned inward on the end walls of the structure . In the out-of-use condition, the sheet geometry is outside the target or target geometry for the sheets. The negative exposure of the primary leaf has an absolute value significantly greater than 0.2 mm and the tertiary leaf has a negative exposure. During use, the protection device and the cover can be pressed against the springs 20, 21 which act on them respectively and occupy their lower end positions, as shown in Figure 3, when a modified geometry substantially corresponds to that of the Figure 1 is obtained. From this target or target geometry, the blades can be flexed downwards against their individual springs 19, but the operation of the shaving improved because the target or target geometry needs not to be lost. Furthermore, it is not essential that the protection device and the lid remain in their lower extreme positions when they are in contact with the skin in the use of the blade unit and they can be allowed to move under the influence of their springs 20, 21, respects. In the embodiment of Figures 4 and 5, the lid 3 and the protection device are fixed to the structure as in figure 1, but the leaves in this case are movable and influenced by the respective springs 24. The springs could press the blades slightly upward against a stop surface or retainer (as mentioned in relation to Figures 2 and 3) but as shown, the springs are uncompressed when the blade unit is at rest and not in use so there is no preload on the leaves. In this condition of the leaf unit, the target or target geometry for the leaves is not satisfied, for example, because the raw sheet has a positive exposure, and the exposure of the sheet tertiary is greater than the preferred maximum of +0.2 mm. During use, however, the blades are pressed against the force of the springs so that a modified geometry is obtained, as shown in Figure 5, and substantially the target geometry or objective of the Figure 1 can be obtained. If required, the blades could be provided with stops or detents to predetermine the positions at which they need to be bent to achieve the target or target geometry. Alternatively, the elasticity speeds can be chosen so that the deflection from the positions according to the target or target geometry will not be excessive. The embodiment of Figures 6 and 7 also has a stationary protection device 2 and a cover 3. The three sheets 11, 12, 13 are mounted on a unit oscillating 26 supported on the structure 1, such as by a curved plate support, for the pivotal movement - "**" of the sheets at the same time about a pivot axis A located above the edges of the sheet. A spring 28 carried by the frame acts on the oscillating unit by pushing it slightly to the unshaven position 5 shown in Figure 6, in which the sheets are external to the target geometry or target for the leaves, the primary leaf has a positive exposure and the tertiary sheet has a negative exposure. During use, the applied forces will cause the oscillating unit 26 0 to move pivotally against the action of the spring 28 and will take the position which is shown in Figure 7 and which can be predetermined by a fixed stop or detent on the structure such as a stop or detent 40 or the stop or detent 41 indicated schematically in the drawings. In this condition of the blade unit, the geometry is substantially as specified above in relation to Figure 1, and therefore applies the target or target geometry for the sheets. As illustrated, the blades are fixedly mounted on the oscillating unit 0 but the blades can be mounted on the oscillating unit by springs so that during shaving the blades can become flexed from the target or target geometry, as it was mentioned above with reference to figures 2 and 3. It will be understood that although they initially do not satisfy the geometrical parameters to obtain the best shaving operation, all the modalities are adapted so that these Geometric parameters will be obtained during its use. Although some embodiments have already been described, it will be appreciated that other embodiments are also possible within the scope of the claims. For example, only one of the protection device and the cover could be movable, or the sheets and the protection device and / or the cover could be movable, or only one or two of the sheets could be moveable. Other combinations of movable elements are also possible. Furthermore, the elements could be adapted to move in a different manner, such as by the protection device which is arranged to flex or bend and / or to move, to vary the extension of the main sheet as well as to modify the exposure of the sheet. A feature of the protection device and / or the lid, which are movable and flexible as in the embodiment of Figures 2 and 3, is that when they are not 0 in use, the edges of the sheet are all placed below a tangential plane. with respect to the surfaces that make contact with the skin of the protection device and the cover. However, the protection device and / or the cover can easily be moved to the retracted position defined by a stopper or detent so that "a desired leaf geometry is obtained." It is believed that the results of shaving Benefits are achieved when cartridges with three elastically mounted blades exhibit, during shaving, a "progressive force" configuration, ie the force on the third blade is greater than the force on the primary or main blade, and the The force on the second leaf or secondary leaf is intermediate with respect to the forces on the primary or main and third or tertiary leaves, or equal to the force on the leaf whether tertiary or primary. can be influenced by the effect of deviation of the orientation of the cartridge, the geometry of the blade, and the elastic arrangement of the blade, as described in detail later. n of the cartridge orientation refers to how the angular orientation of the cartridge relative to the skin surface influences the forces on the individual blades. Figures 8-10 illustrate three orientations of the cartridge, a neutral orientation, a heavy orientation towards the lid, and a heavy orientation towards the protection device. In these figures, the cartridge 130 is schematically illustrated which includes a protection device 132, the cover 134 and the sheets 136, 138, 140 and is shown with a cartridge orientation related to the surface of the skin 142 prior to that the surface of the skin has been flexed or deflected. During actual shaving, the cartridges in general could be pushed towards the surface of the skin, f lexing it so that the complete upper part of the cartridge will make contact with the skin. If the exposures are assumed to be at best (unshaven condition), the spring preloads and flexion rates are equal for each of the leaves, then the orientation of the cartridge will control the force configuration on the leaves during shaving. In Figure 8, the cartridge 130 is oriented in the neutral condition. In this case, when the cartridge 130 is pressed against the surface of the skin 142 by the user to bring all the sheets into contact with affectation, the forces are applied uniformly to the three sheets. To produce a progressive force configuration, the geometry of the sheet and / or the elastic arrangement of the sheets can be modified, as described in detail below. In Figure 9, the cartridge 130 has a heavy orientation towards the lid. In this case, the cap 132 makes contact with the surface of the skin initially. When the rest of the upper part of the cartridge is pushed against the skin, greater force is applied to the sheets near the lid. Consequently, the force on the tertiary blade is greater than the force on the secondary blade, which is greater than the force on the primary blade, which is a progressive force configuration. the cartridge 130 has a heavy orientation towards the protection device.In this case, the protection device 134 makes contact with the surface of the skin initially.As the rest of the upper part of the cartridge is pushed against the skin, it is applies greater force to the leaves near the protection device, consequently, the force on the primary or main blade is greater than the force on the secondary blade., which is greater than the force on the tertiary blade. The heavy condition towards the protective device therefore promotes the opposite of the "progressive force". In order to produce a progressive force configuration, the geometry of the blade and / or the elastic arrangement of the blades can be modified to counteract the configuration of the force that could otherwise be caused by the heavy condition towards the protection device 0, as described in detail later. For cartridges which are not pivotally connected to the handle, the orientation of the cartridge with respect to the skin, and consequently the effect of deviation of the orientation of the cartridge, is generally determined by the orientation of the cartridge with respect to the handle.

, "For the cartridges fixed to the sleeve through a pivot in addition to the orientation at rest of the cartridge, the location of the pivot and the elastic return force will affect the effect of deviation of the orientation of the cartridge. the repose orientation of the cartridge is as shown in Figure 9, the cap will initially make contact with the skin, however, if the pivot is in the region of the protection device, and there is an elastic force of light return or small, cartridge 0 will become weighted towards the protective device during shaving.As noted above, the configuration of the force on the blades can also be influenced by the geometry of the blade and the elastic arrangement of the 5 blades. Leaf geometry refers to exposure at rest.The elastic arrangement of the leaf refers to the rate of flexibility and preload.Figure 11 illustrates a form of proportion An elastic mount for the leaves and how can be adjusted or the exposure in the rest of a leaf. (Other elastic or spring mounting approaches can also be used). Referring to Figure 11, the cantilevered beam plastic arm 144 extends from the side wall 146 of the housing and provides an elastic support for the folded upper portion 146 at one end of the sheet.

The cutting edge 150 of the sheet is prevented from moving up further by the metal staple 152, which is fixed or secured to the housing. A similar arm extends from the other side of the cartridge and provides an elastic support for the other end of the sheet under a similar retaining clip. The pair of arms 144 corresponds to the springs 19, 24 shown in Figures 2-5. The upward force F that the arm 144, acting as a cantilevered beam, exerts on the portion 148 of the blade, is a linear function of its downward displacement, and, from its non-deflected position: F = k * y, where k is a constant of elasticity that depends on the length of the arm, L, the moment of inertia of the 3 arm, I, and the modulus of elasticity, E (k = L / (3EI)). If the arm 144 is deflected or flexed a distance and by the staple 152 in the fabrication (ie, it provides the arm 144 with a preload force Fp of k * y), then y in the formula is equal to y + y, , where y, is equal to the downward movement from the rest position shown in Figure 11. The forces on the blades can be controlled in a variety of ways to cause a progressive force configuration during shaving. For example, the arm 144 can be provided with a different elastic constant by changing the length of the arm 144 or the inertial movement (e.g., providing a thicker cross-section for the arm 144). The arm 144 can also be provided with a different preload force F by maintaining the same section and length of the arm, but by moving the location in which the arm 144 is fixed to the side wall 146 of the housing upwards (to increase the force of preload) or down (to decrease the strength of the preload). The position or shape of the staple 152 could also be adjusted in relation to the arms, O to adjust the preload force F; for example, the staple 152 could be mounted so that the portion contacting a sheet is lower or higher than the portion contacting a different sheet. One way to achieve a progressive force setting during shaving is to have an initial progressive exposure and the same preload force and spring constant for all the blades. Another way to achieve a progressive force setting during shaving is to have the same initial exposure (for example, all 0 zero) and have a progressive preload. A progressive preload can be provided having the elastic constant for the tertiary blade that is higher than the elastic constant for the second blade, and having or causing the spring constant for the primary sheet to be less than the elastic constant for the second sheet or secondary sheet. A progressive preload can also be achieved using the same arms (ie, the same elastic constants) for all the blades, but having the second arm mounted higher than the primary or main blade and the third arm mounted higher than the second. The springs or spring constants, the preloads and the initial exposures can be used in combination with the deflection effect of the cartridge orientation to produce a progressive exposure and / or a progressive force configuration. For example, if the cartridge has a heavy orientation towards the protection device (for example, a first orientation of the cover but with a pivot in the vicinity of the protective device and a short or short return spring, as noted previously) and a progressive geometry in its use can be made with higher preloads, constants of elasticity, and exposures at rest on the tertiary and secondary leaves than on the primary leaf. Other combinations that can be used to promote a progressive force during shaving include a preload, a constant of elasticity, or a higher exposure at rest on the third blade than on the first blade or combinations of these parameters that have higher values on the third sheet when compared to the first sheet. Preferably, the second sheet could have intermediate values or values that are the same as those of the third sheet to promote the progressive force configuration. Elastic or spring preloads are typically in the range of about 25 g or less. The force on the individual sheets could be expected to be in the range of about 0-40 g, with between zero and 20 grams on the first sheet, and between an amount greater than zero and less than 40 grams on the third sheet. Typically the forces on the individual sheets could be greater than 5 grams. In exposures at rest and exposures during shaving, they are typically at the intervals indicated above.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Having described the invention as above, property is claimed as contained in the following

Claims (50)

R E I V I N D I C A C I O N S

1. A razor blade unit, characterized in that it comprises a protection device, a lid, and first, second and third blades with sharp parallel edges located in succession between the protection device and the lid, at least one element selected from the three sheets, the protection device and the cover, is movable from a non-shaved position to modify an exposure dimension of the leaf of the sheet unit and achieve a modified sheet geometry, wherein the exposure of the first sheet is not greater than zero and the exposure of the third sheet is not less than zero, at least one of the first and third sheets have a different exposure when at least one movable element is in the non-shaved position.

2. A blade unit for a razor according to claim 1, characterized in that at least one element is movable from the unshaven position to a predetermined position defined by stop means or a snap arrangement.

3. A razor blade unit according to claim 1 or 2, characterized in that at least one movable element is deflected by spring means to the non-shaved position.

4. A blade unit for a razor according to claim 3, characterized in that at least one element is deflected by the spring means to an end or end position defined by the stop means or retainer.

5. A blade unit for a razor according to any of claims 1 to 4, characterized in that at least one movable element comprises the protection device.

6. A blade unit for a razor according to any of claims 1 to 5, characterized in that at least one movable element comprises the lid.

7. A blade unit for a razor according to any of claims 1 to 4, characterized in that at least one movable element comprises one or more of the blades.

8. A blade unit for a razor according to claim 7, characterized in that the blades are movable independently of one another.

9. A blade unit for a razor according to claim 7, characterized in that the blades are movable at the same time.

10. A blade unit for a razor according to claim 9, characterized in that the blades are carried by an element mounted for pivoting movement.

11. A blade unit for a razor according to claim 10, characterized in that the pivoting element can be pivotally moved about an axis located above the edges of the blades.

12. A razor blade unit, characterized in that it comprises a protection device, a cover and a plurality of sheets with sharp parallel edges located in succession between the protection device and the cover, at least one of the protection device and the cover is movable against an elastic or spring force from a non-shaved position to a predetermined operative position in which a modified blade geometry is obtained, in the unshaven position the edges of the blades are placed below a tangential plane to the contact surfaces with the skin of the protection device and the cover.

13. A razor according to claim 12, characterized in that the first, second and third sheets are provided and have edges placed between the protection device and the lid.

14. A blade unit for a razor according to any of claims 1 to 11, or 13, characterized in that in the geometry of the modified blade, the exposure of the first blade has a negative exposure with an absolute value in the range of 0 to 0.2 mm.

15. A razor blade unit according to claim 14, characterized in that in the geometry of the modified blade, the extension between the first edge of the blade and the protection device is in the range of 0.5 mm to 1.5 mm. .

16. A blade unit for a razor according to claim 14 or 15, characterized in that in the geometry of the modified blade, the exposure of the first blade is substantially equal to -0.04 mm.

17. A blade unit for a razor according to any of claims 1 to 11 or 13 to 16, characterized in that in the modified blade geometry the exposure of the third "blade" has a positive value no greater than +0.3 mm.

18. A razor blade unit according to any of claims 1 to 11 or 13 to 17, characterized in that in the geometry of the modified blade the extension between the edge of the third blade and the edge of the second blade is in the interval from 1.0 to 2.0 mm.

19. A razor blade unit according to any of claims 1 to 11 or 13 to 18, characterized in that in the modified blade geometry the extension between the edge of the second blade and the edge of the first blade is in the range from 1.0 to 2.0 mm.

20. A blade unit for a razor according to claim 18 or 19, characterized in that in the geometry of the modified blade the extension between the edges of the first and second blades and / or 5 between the edges of the second and third sheets is substantially equal to 1.5 mm.

21. One blade unit for shaver • > * in accordance with any of the claims 1 10 to 11 or 13 to 20, characterized in that in the geometry of the modified sheet the second sheet has an exposure not less than the exposure of the first sheet and no greater than the exposure of the third sheet.

22. A blade unit for a razor according to claim 21, characterized in that in the geometry of the modified blade the exposure of the second blade is substantially equal to zero.

23. A blade unit for a razor according to any of claims 1 to 11 or 13 to 22, characterized in that in the geometry of the modified blade the exposure of the third blade has a positive value substantially equal in magnitude to the 25 negative value of the exposure of the first sheet.

24. A blade unit for a razor according to any of claims 1 to 11 or 13 to 23, characterized in that in the geometry of the modified blade the extension between the first edge of the blade and the protection device is substantially smaller that the extension between the edges of the first and second leaves and the extension between the edges of the second and third leaves.

25. A razor blade unit according to any of claims 1 to 11 or 13 to 24, characterized in that in the geometry of the modified blade the extension between the first edge of the blade and the protection device is substantially 15 equal to 0.7 mm.

/ - 26. A razor blade unit, characterized in that it is substantially as described herein with reference to Figures 2 to 7 of the appended drawings.

27. A shaving cartridge, characterized in that it comprises: a housing having a connection structure for making or establishing a removable connection with a sleeve, a protection device on the front of the cartridge, a cover on the back of the cartridge. cartridge, and first, second and third blades with sharp parallel edges located in succession on the housing between the protection device and the lid and mounted independently for movement biased or activated by a spring with respect to the housing, the blades are movable from the unshaved positions to the shaving positions in which the force on the first blade is less than the force on the third blade.

28. The cartridge according to claim 27, characterized in that in the shaving positions the force on the first blade is less than or equal to the force on the second blade, and the force on the second blade is less than or equal to the force on the third sheet.

29. The cartridge according to claim 27, characterized in that the housing has a pivoting structure to provide the pivotal movement of the housing about a pivot axis.

30. The cartridge according to claim 29, characterized in that the pivot axis is at the front of the leaves in the region of the protection device.

31. The cartridge according to claim 27, characterized in that the cartridge is weighted or loaded towards the protection device.

; - 32. The cartridge according to claim 10, characterized in that the cartridge is weighted or loaded towards the protection device.

33. A razor, characterized in that it comprises: a sleeve, a housing connected to the sleeve, and a protection device at the front of the housing, a cover at the rear of the housing, and first, second and third sheets with edges parallel sharps located in succession on the housing between the protection device and the lid, and mounted independently for the movement biased or activated by a spring with respect to the housing, the blades are movable from the positions ('~~ of not shaved to the shaving positions in which the force on the first blade is less than the force on the third blade.

34. The cartridge according to claims 27, 31 or 32 or the razor according to claim 33, characterized in that the third blade has a higher elastic constant than the first blade. 0

35. The cartridge according to claims 27, 31 or 32 or the razor according to claim 33, characterized in that the third blade has a preload higher than that of the first blade.

36. The cartridge according to claims 27, 31 or 32, or the razor according to claim 33, characterized in that the third sheet has a higher exposure at rest than the first sheet.

37. The cartridge according to claims 28, 31 or 32 or the razor in accordance with claim 33, characterized in that the second (-'- and third sheets have higher elastic constants than the first sheet.

38. The cartridge according to claims 28, 31 or 32, or the razor according to claim 33, characterized in that the second and third blades have higher preloads than the first blades.

39. The cartridge according to claims 28, 31, or 32, or the razor according to claim 33, characterized in that the second and third sheets have a higher exposure at rest than the first sheet.

40. The cartridge according to claims 27, 31, or 32, or the razor according to claim 33, characterized in that the third blade has a higher exposure at rest and a higher preload than the first blade. .

41. The cartridge according to claims 27, 31, or 32, or the razor according to claim 33, characterized in that the third sheet has a higher exposure at rest and "*" "an elastic constant. higher than the first sheet.

42. The cartridge according to claims 27, 31, or 32, or the shaver in accordance with claim 33, characterized in that the third blade has a higher preload and a higher spring constant than the first blade.

43. The cartridge in accordance with claims 27, 31, or 32, or the razor according to claim 33, characterized in that the third blade has a higher exposure at rest, a higher preload, and a higher spring constant than the first blade.

44. The cartridge according to claims 27, 28, 31, or 32, or the razor according to claim 33, characterized in that the second and third blades have a higher exposure at rest. and preloads higher than the first sheet.

45. The cartridge according to claims 27, 28, 31, or 32, or the shaving razor according to claim 33, characterized in that the second and third sheets have a higher exposure at rest and constants. elastics higher than the first leaflet.

46. The cartridge according to claims 27, 28, 31, or 32, or the razor according to claim 33, characterized in that the second and third blades have higher preloads and higher spring constants than the first blade. .

47. The cartridge according to claims 27, 28, 31, or 32, or the razor according to claim 33, characterized in that the first and second sheets have a higher exposure at rest, higher preloads, and constants elásticas higher than the first sheet.

48. The cartridge according to claims 27, 28, 31 or 32, or the razor according to claim 33, characterized in that the force on the first blade during shaving is between zero and 20 grams and the force on the third blade during shaving is greater than zero and less than 40 grams.

49. A shaving cartridge, characterized in that it comprises: a housing having a connection structure for making or establishing a removable connection with a sleeve, a protective device on the front of the cartridge, a cover on the back of the cartridge, and first, second and third blades with sharp parallel edges located in succession on the housing between the protection device and the lid and mounted independently for movement biased or activated by a spring with respect to the housing, the blades are movable from non-engaging positions. shaving to shaving positions in which the exposure on the first sheet is less than the exposure on the third sheet.

50. The cartridge according to claim 49, characterized in that in the shaving positions, the exposure on the first sheet is less than or equal to the exposure on the second sheet, and the exposure on the second sheet is less than or equal to the exhibition on the third sheet.