MXPA06010277A

MXPA06010277A - Cutting members for shaving razors with multiple blades

Info

Publication number: MXPA06010277A
Application number: MXPA/A/2006/010277A
Authority: MX
Inventors: Pennell Evan; Fitzgerald Cheryl; Louis Cardy
Original assignee: Fitzgerald Cheryl; Louis Cardy; Pennell Evan
Priority date: 2004-03-11
Filing date: 2006-09-08
Publication date: 2007-04-20

Abstract

A cutting member for a shaving, razor that includes an elongated metal blade and an elongated bent metal support that has an elongated platform portion, an elongated bent portion and an elongated base portion. The blade and platform portion of the blade support are sized to make them more compact at the same time that the platform portion is provided with a sufficiently flat area for reliably supporting the blade. The platform portion extends forward from the bent portion to a front end, and includes a weld area that is spaced from the front end and from the bent portion. The platform portion also includes a flat portion that includes and extends beyond the weld area. The elongated metal blade has a cutting edge at the front, a blade end at the rear, a tapered portion leading to the cutting edge and a uniform thickness portion extending from the blade end at the rear to the tapered portion. The uniform thickness portion of the blade is supported on the platform portion and welded to the platform portion at the weld area, and the tapered portion extends forward beyond the front end of the platform portion. The blade is less than 1 mm in length from the cutting edge to the blade end. The platform portion of the blade support is less than 0.7 mm in length from the front end to the bent portion. The elongated bent metal support is made of metal that is between 0.004"and 0.009"thick.

Description

CUTTING MEMBERS FOR SHAVING MACHINES WITH MULTIPLE LEAVES The invention relates to cutting members for razors with multiple blades. In recent years, razors with several blades have been proposed in the patent literature and marketed, as discussed, p. e.g., in U.S. Pat. no. 5,787,586 which generally describes a type of design that has been marketed by The Gillette Company as the Mach triple blade razor and in the published U.S. patent application. no. 2002/0144404 describing three and four-blade shaving machines. Increasing the number of blades on a razor usually improves the machine's efficiency and the distribution of compressive forces on the skin, but it can also produce an increase in drag forces, reduce maneuverability and decrease the ability to cut. Increasing the amount of razor blades also requires an increase in the area occupied by the blades or a reduction in the space between the cutting edges of the blades. Increasing the area occupied by razor blades can affect the performance of shaving. The reduction of the space between the sheets produces a change in the volume of the skin between the cutting edges and also in the efficiency of the shaving, and it may be necessary to modify other parameters of the blade geometry such as the angle of the tangent and the exposure of the sheet. The increase in the number of sheets can also affect the ease of rinsing of the razor and this influences the ability to remove the remains of the shaving left in the area of the blade. U.S. Pat. no. No. 5,787,586 describes razor blades placed on curved metal supports, a type of support The Gillette Company has reliably manufactured for years for the commercial products Sensor and Mach III. The published U.S. patent application. no. 2002/0144404 discloses three- and four-leaf designs with metal support bars as a support for the sheets and a test procedure to determine a rapid wash rate that indicates the ability to rinse the razor cartridge to eliminate remains of shaving. The second document states that the support bars contributed to achieving the appropriate values of the fast wash index reported for the modalities described. The invention shows, in general, a cutting member for a razor; the cutting member includes an elongated metal razor blade and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongate base portion. Generally, the size of the razor blade and the platform portion of the blade support is such that blade and that portion are more compact, and at the same time, the platform portion has a sufficiently flat area to support the sheet reliably.

The platform portion extends forwardly from the curved portion to a front end and includes a joining area (eg, a welding area) that is spaced apart from the front end and the curved portion. The platform portion also has a flat portion that includes the bonding area and extends beyond it. The elongated metal razor blade has a cutting edge at the front, one end of the blade at the rear, a conical portion leading to the cutting edge and a portion of uniform thickness extending from the end of the blade at the end. back to the conical portion. The uniform thickness portion of the sheet is supported on the platform portion and secured in the joint area of the platform portion and the conical portion extends forward beyond the front end of the platform portion. In one aspect of the invention, the razor blade has a length of less than 1 mm from the cutting edge to the end of the blade, preferably less than 0.9 mm and most preferably about 0.85 mm. In another aspect of the invention, the plrm portion of the sheet support has a length of less than 0.7 mm from the front end to the curved portion, preferably less 0.6 mm and most preferably approximately 0.55 mm. In another aspect of the invention, the elongated curved metal support is made of a metal whose thickness is 0.010 cm (0.004") to 0.023 cm (0.009"), (preferably 0.013 cm (0.005") to 0.018 cm ( 0.007") and most preferably approximately 0.015 cm (0.006")) and the curved portion has a radius of curvature of less than 0.1 mm (preferably less than 0.09 mm and most preferably less than 0.08 mm). , the invention generally represents a blade of the razor including at least four (preferably at least five) cutting members as already described with gaps between sheets less than 1.2 mm, preferably less than 1.1 mm and with the Maximum preference of about 1.05 mm Particular embodiments of the invention may include one or more of the following characteristics: The angle between the base portion and the plrm portion is from 109 ° to 115 °, preferably from 10 ° to 113 ° and with the highest preference approximately 111.5 °. The sheets are secured to the plrm portion by means of welding. Some embodiments of the invention may include one or more of the following advantages. The cutting members according to the invention can be manufactured reliably and are compact enough for use in multi-blade shaving machines, with at least 4 or 5 blades, while reducing the spaces and maintaining the proper rinsing facility. Other advantages and features of the invention will be apparent from the following description of particular embodiments and the appended claims.

The details of one or more embodiments of the invention are defined in the accompanying figures and the description that follows. Other features, objectives and advantages of the invention will be apparent from the description and figures, and also from the claims. Figure 1 is a perspective view of a razor. Figure 2 is a perspective view of the razor of Figure 1 illustrating its replaceable cartridge separated from its handle. Figure 3 is a vertical sectional view illustrating the relative positions of some of the components of a razor cartridge of Figure 1; Figure 4 is a top view of a cutting member of the cartridge of Figure 3; Figure 5 is a front view of the cutting member of Figure 4. Figure 6 is a vertical sectional view of the cutting member of Figure 4. Figure 7 is an enlarged vertical sectional view of the cutting member of Figure 4. Figure 4. Figure 8 is a vertical sectional view of a cutting member of the prior industry. With reference to Figures, 1 and 2, the shaver 10 includes a disposable cartridge 12 and a handle 14. The cartridge 12 includes a connecting member 18 that connects the cartridge to a handle 14, and a razor blade unit. 16 which is connected in a pivot to the connection member 18.

The sheet 16 includes a plastic housing 20, a primary cover 22 on the front of the housing 20, a cover 24 with a lubricant strip 26 on the back of the housing 20, five elongated razor blades 28 between the primary cover 22 and the primary cover 24 and a trimming sheet unit 30 attached to the back of the housing 20 by fasteners 32 that also retain the razor blades 28 in the housing 20. With reference to Figures, 3-6, it is noted that each sheet The elongate shaving 28 is supported on a corresponding elongate curved bracket 400 having an elongated bottom base portion 402, an elongated curved portion 404 and an elongated platform portion 406 on which the sheet 28 is supported. The sheet space is defined as the distance from the edge of the sheet to the contact element with the skin located immediately in front of that edge, based on the measurement along the tangent line that extends between the element and the edge of the sheet. The cutting edges 406 of each razor blade are separated from the cutting edges 408 of the adjacent sheets by the distances S2 = S3 = S4 = S5 of space between sheets; the space between sheets is from 0.95 mm to 1.15 mm, preferably from 1.0 mm to 1.1 mm and most preferably, approximately 1.05 mm. The exposure of the sheet is defined as the perpendicular distance or the height of the edge of the sheet measured with respect to a plane tangential to the surfaces of the elements of the next sheet that come into contact with the skin in front of the edge and behind the sheet. edge. Since the cutting edges abut against fasteners 32 when not in use, those edges are in a common plane such that the exposure of the three immediate sheets is zero. The front sheet 28 has a negative exposure of -0.04 mm and the last sheet 28 has a positive exposure. The space S1 from the front rail 409 to the cutting edge of the front sheet 28 is 0.65 mm and the distance SC from the cutting edge of the last sheet 28 to the tangent point on the lubricant strip 26 of the lid 24 is 3.16 mm. The distance ST from the first cutting edge 408 to the last cutting edge 408 is four times the space between sheets and is therefore from 3.8 mm to 4.6 mm, preferably from 4.0 mm to 4.4 mm and most preferably, approximately 4.2 mm, ie from 4.1 mm to 4.3 mm With reference to Figures, 4-6, the sheet 28 is connected to the platform portion 406 by thirteen spot welds 410 applied with a laser that melts the metal of the sheet 28 in the welding area WA to produce the molten metal which upon cooling forms the weld 410 to the platform portion 406. The welding area WA is a joining area in which the sheet is secured to the platform portion. The welding area WA is located within a flat portion FP of the platform portion 406. The length LB of the sheet from the cutting edge 408 to the end of the sheet 450 is less than 1 mm, preferably less than 0.9 mm and most preferably, approximately 0.85 mm. The sheet 28 has a portion of uniform thickness 412 that is supported on a platform portion 406 and a conical portion 412 that extends beyond the front end 452 of the platform portion 406.

The elongated curved metal support 400 is made of a metal having a thickness of 0.010 cm (0.004") to 0.023 cm (0.009") (dimension T), preferably a metal of 0.013 cm (0.005") to 0.018 cm ( 0.007") and most preferably a metal of about 0.015 cm (0.006") in thickness The platform portion 406 has a length LP from its front end 452 to the curved portion 404 less than 0.7 mm, preferably less 0.6 mm and most preferably about 0.55 mm The curved portion 404 has an inner radius of curvature R less than 0.1 mm, preferably less than 0.09 mm and most preferably less than 0.08 mm. base portion 402 and platform portion 406 is 108 ° to 115 °, preferably 10 ° to 113 ° and most preferably approximately 111.5 ° .. Figure 8 is a schematic representation of a razor blade 470 and An angular support 472 used in the Mach razor The razor blade 470 has a length LB of 1.23 mm. The support 472 is made of 0.028 cm (0.011") thick metal, has a platform portion 474 with an LP length of 0.83 + 0.10 / -0.05 and a radius of curvature R of 0.20 mm 9 (m). platform portion 474 is curved, with a curvature that surpasses the flat portion FP in which the weld 476 is located. The flat portion FP has a minimum dimension of 0.3 mm In the shaving cartridge, the space between the blades is 1.50 mm, so that the distance from the cutting edge of the front blade to the cutting edge of the last blade is 3.00 mm, if the same distance between blades was maintained in a cartridge of a razor with five blades, the distance from the cutting edge of the front sheet to the cutting edge of the last sheet would be 6.00 mm If the same sheets 470 and the angle supports 472 were used with smaller spaces between sheets, those smaller spaces between adjacent sheets 470 and angular supports 472 would reduce the rinse rate and increase the retention of shaving remnants in the area of the blade with less shaving performance. With reference to Figure 7, because the angular support 400 is cut and formed from a thinner metal, it is easier to provide a reduced radius of curvature R, and thus a greater percentage of the platform portion can be flat The use of a thinner material for the support also allows a greater proportion of the platform area to be flat after forming. Because the sheet 28 has a portion of uniform thickness 412 of reduced length, a minimum flat area is needed to support the sheet accurately and reliably. The reduced uniform thickness portion 412 can be used, while maintaining the sheet holder accurately, because the extension of the curved areas of the platform portion 406 outside the planar area FA is reduced. That precise support of the blade is necessary to provide the blade with the desired geometry so that the expected shaving performance is obtained. Other embodiments of the invention are within the scope of the appended claims. For example, the razor blades can be attached to the curved supports by other welding techniques, e.g. eg, arc welding, or other bonding techniques such as adhesives or ligatures.

Claims

CLAIMS 1. A cutting member for a razor comprising: An elongated metal razor blade having a cutting edge, an end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending therefrom end of the leaf to the conical portion; the razor blade has a length of less than 1 mm from the cutting edge to the end of the blade, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion, the portion of platform extends forwardly from the curved portion to a front end, the elongate base portion extends downwardly from the curved portion, the platform portion includes a bonding area that is spaced from the front end and the curved portion, the platform portion includes a flat portion that includes the joint area and extends beyond it, the uniform thickness portion of the razor blade is supported on the platform portion and secured to the platform portion in the area of Union; the conical portion extends forward beyond the front end of the platform portion. A cutting member for a razor comprising: An elongated metal razor blade having a cutting edge, one end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending from the end of the sheet to the conical portion, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion, the platform portion extends forwardly from the curved portion until a front end, the platform portion has a length less than 0.7 mm from the front end to the curved portion, the elongated base portion extends downwardly from the curved portion, the platform portion includes a joint area that is spaced apart of the front end and the curved portion, the platform portion includes a flat portion that includes the joining area and extends beyond the to it, the uniform thickness portion of the razor blade is supported on the platform portion and secured to the platform portion in the joint area; the conical portion extends forward beyond the front end of the platform portion. A cutting member for a razor comprising: An elongated metal razor blade having a cutting edge, one end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending from the end of the sheet to the conical portion, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion, the platform portion extends forwardly from the curved portion until a front end, the elongated base portion extends downwardly from the curved portion; the platform portion includes a joining area that is spaced from the front end and the curved portion, the platform portion includes a flat portion that includes the bonding area and extends beyond it, the portion of uniform thickness of the razor blade is supported on the platform portion and secured to the platform portion in the joint area; the conical portion extends forward beyond the front end of the platform portion, the elongated curved metal support is made of a metal 0.010 cm (0.004") to 0.023 cm (0.009") in thickness; the curved portion has a radius of curvature of less than 0.1 mm. The cutting member according to claim 1, further characterized in that the platform portion has a length of less than 0.7 mm from the front end to the curved portion. The cutting member according to claim 3, further characterized in that the platform portion has a length of less than 0.7 mm from the front end to the curved portion. The cutting member according to claim 1, further characterized in that the elongated curved metal support is made of a metal from 0.010 cm (0.004") to 0.023 cm (0.009") thick; the curved portion has a radius of curvature of less than 0.1 mm. The cutting member according to claim 4, further characterized in that the elongated curved metal support is made of a metal of 0.010 cm (0.004") to 0.023 cm (0.009") in thickness; the curved portion has a radius of curvature of less than 0.1 mm. The cutting member according to claim 1, further characterized in that the sheet has a length less than 0.9 mm. The cutting member according to claim 1, further characterized in that the sheet has a length of about 0.85 mm. 10. The cutting member according to claim 3, further characterized in that the elongated curved metal support is made of a metal having a thickness of 0.013 cm (0.005") to 0.018 cm (0.007"). The cutting member according to claim 3, further characterized in that the elongated curved metal support is made of a metal having a thickness of about 0.015 cm (0.006") 12. The cutting member in accordance with the claim 2, further characterized in that the platform portion has a length of less than 0.6 mm from the front end to the curved portion 13. The cutting member according to claim 2, further characterized in that the platform portion has a length of about 0.55 mm from the front end to the curved portion 14. The cutting member according to claims 1, 2 or 3, further characterized in that the angle between the base portion and the platform portion is from 108 ° to 115 °. 15. The cutting member according to claims 1, 2 or 3, further characterized in that the angle between the base portion and the plate portion The cutting member according to claims 1, 2 or 3, further characterized in that the angle between the base portion and the platform portion is approximately 111.5 °. 17. The cutting member according to claims 1, 2 or 3, further characterized in that the razor blade is secured to the joint area by means of a weld. 18. A blade of the shaving machine comprising: A housing, four or more cutting members supported in the housing, a cover on the front of the housing, a cover on the back of the housing, each of the cutting members comprising: An elongated metal razor blade having a cutting edge, one end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending from the blade end to the conical portion; the razor blade has a length of less than 1 mm from the cutting edge to the end of the sheet, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion, the portion of platform extends forwardly from the curved portion to a front end, the elongate base portion extends downwardly from the curved portion, the platform portion includes a welding area that is spaced from the front end and the curved portion, the platform portion includes a flat portion that includes the welding area and extends beyond it, the uniform thickness portion of the razor blade is supported on the platform portion and welded to the platform portion in the area of welding; the conical portion extends forward beyond the front end of the platform portion. 19. A blade of the razor comprising: A housing, four or more cutting members supported in the housing, a cover on the front of the housing, a cover on the back of the housing, each of those cutting members comprising: An elongated metal razor blade having a cutting edge, one end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending from the blade end to the conical portion, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongate base portion, the platform portion extending forward from the curved portion to a front end, the platform portion having a shorter length 0.7 mm from the front end to the curved portion, the elongate base portion extends down from the curved portion, the platform portion incl. When a joining area is spaced from the front end and the curved portion, the platform portion includes a flat portion that includes the bonding area and extends beyond it, that portion of uniform thickness of the sheet. shaving is supported on the platform portion and secured to the platform portion in the joint area; the conical portion extends forward beyond the front end of the platform portion. 20. A blade of the razor comprising: A housing, four or more cutting members supported in the housing, a cover on the front of the housing, a cover on the rear of the housing, each of those cutting members comprising: An elongated metal razor blade having a cutting edge, one end of the blade, a conical portion near the end of the blade and a portion of uniform thickness extending from the blade end to the conical portion, and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion, the platform portion extending forwardly from the curved portion to a front end, the elongated base portion extending toward down from the curved portion, the platform portion includes a joining area that is spaced from the front end and the curved portion, the platform portion Including a flat portion that includes the bonding area and extends beyond it, the uniform thickness portion of the razor blade is supported on the platform portion and secured to the platform portion in the bonding area; the conical portion extends forward beyond the front end of the platform portion, the elongated curved metal support is made of a metal from 0.010 cm (0.004") to 0.023 (0.009") in thickness; the curved portion has a radius of curvature of less than 0.1 mm. 21. The blade of the razor according to claim 18, 19 or 20, further characterized in that it has at least five blades. 22. The blade of the razor according to claim 18, 19 or 20, further characterized in that it has five blades and in that the distance from the front blade to the last blade is from 3.8 mm to 4.6 mm. 23. The blade of the razor according to claim 18, 19 or 20, further characterized in that it has five blades and in that the distance from the front blade to the last blade is 4.0 mm to 4.4 mm. 24. The blade of the razor according to claim 18, 19 or 20, further characterized in that it has five blades and in that the distance from the front blade to the last blade is 4.1 mm to 4.3 mm. SUMMARY A cutting member for a razor; the cutting member includes an elongated metal razor blade and an elongated curved metal support having an elongated platform portion, an elongated curved portion and an elongated base portion. The size of the razor blade and the platform portion of the blade support is such that the blade and the portion are more compact, and at the same time, the platform portion has a sufficiently flat area to support the blade in a manner reliable The platform portion extends forwardly from the curved portion to a front end and includes a welding area that is separate from the front end and the curved portion. The platform portion also has a flat portion that includes the welding area and extends beyond it. The elongated metal razor blade has a cutting edge at the front, one end of the blade at the rear, a conical portion leading to the cutting edge and a portion of uniform thickness extending from the end of the blade at the end. back to the conical portion. The uniform thickness portion of the sheet is supported on the platform portion and welded in the welding area of the platform portion and the conical portion extends forward beyond the front end of the platform portion. The sheet has a length of less than 1 mm from the cutting edge to the end of the sheet. The platform portion of the blade support has a length of less than 0.7 mm from the front end to the curved portion. The elongated curved metal support is made of a metal that has a thickness of 0.010 cm (0.004") to 0.023 cm (0.009").