MXPA06010273A - Shaving razors and other hair cutting assemblies - Google Patents

Abstract

A shaving razor blade unit including a housing (20) having a primary guard (22) at a front of the housing (20) and a primary cap (24) at an upper surface at a back of the housing, one or more primary shaving blades (28) between the primary guard and the primary cap, a rear wall (506) having a rear exterior surface extending downward from the upper surface at the back of the housing to a terminating surface, and a trimming blade (504) mounted on the rear wall and having a trimming cutting edge (536) extending at least partially beyond the terminating surface inside of an imaginary extension of the rear exterior surface, the rear exterior surface defining a secondary cap for the trimming blade. The back of the housing can include trimming guard including spaced guard segments. The trimming blade (504), trimming guard (528) and trimming cap (535) can be provided as an assembly that is attached to the rest of the housing. The assembly can include a sheet metal support with a blade welded to the support.

Description

SHAVING MACHINES AND OTHER UNITS TO CUT THE HAIR The invention refers to razors and other units for cutting hair. In recent years, razors with several blades have been proposed in the patent literature and marketed, as discussed, p. For example, in the US Patent. no. No. 5,787,586, which generally describes a design lipo marketed by The Gillette Company as the multiple-blade Mach lll razor. 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, p. eg, sideburns and hairs that are close to the nose. U.S. Pat. no. No. 6,276,061 incorporated herein by reference discloses the placement of an extra trim sheet on an angular blade holder at the rear of a three-blade shaver. The patent does not disclose the manner in which the sheet is secured in the housing. The trimming sheet is exposed, therefore the person using the cartridge could be cut. The patent does not describe the surfaces of the skin that come into contact with the cutting sheet nor the proper control of the contact between the skin and those surfaces. In one aspect, the invention generally shows a blade unit of the razor including a housing with a primary cover on a front portion of the housing and a primary cover on an upper surface of a rear portion of the housing, a or more primary razor blades between the primary cover and the primary cover, a rear wall having an external rear surface extending downwardly from the upper surface of the rear part of the housing to a terminal surface and a cutting sheet that is located on the rear wall and having a cutting cutting edge that extends at least partially beyond the terminal surface in an imaginary ex- tension of the outer rear surface; the external rear surface defines a secondary cover for the trim sheet. In another aspect, the invention generally shows a blade unit of the razor including a housing, a primary cover, a primary cover, one or more primary razor blades, a rear wall in the rear part of the housing, a trimming sheet located in the rear part of the housing and a protection of the trimming comb located in the part of the housing that includes spaced protection segments. In another aspect, the invention generally shows a blade unit of the razor including a housing, a primary cover, a primary cover, one or more primary razor blades and a clipping unit attached to the part. back of the accommodation. The trimming unit includes a trimming blade having a trimming cutting edge and a trimming cover at a predetermined position with respect to that trimming edge to define a trim sheet spacing and an angle of the trimming blade.

In another aspect, the invention shows, in general, an element for cutting the hair (eg, in the trimming blade unit that is connected to a blade unit of the shaving machine) that includes a blade holder. made of a sheet metal cut and formed, and a sheet welded to the sheet holder, so that the sheet holder defines a cover for the sheet and a cover for the sheet. The particular modalities of the invention may include one or more of the following characteristics. The trim cover may include flow conduits for the removal of shaving debris extending from a region located behind the trim sheet and trim cover. The razor blade unit can have a, two or more skin protection structures between the trimming cover and that cutting cutting edge. In some embodiments, the back wall may be completely formed of the same material as that housing. In other modalities, the rear wall is located in a separate component attached to the housing. The housing can be made of plastic and the rear wall can be made of metal. The trim sheet may be located on a lower surface of the rear wall. The cut sheet can be welded to the inner surface. The trim cover can be a trim comb protection that includes separate protection segments. The protection of the trimming comb can be made of a metal sheet cut and formed. The razor blade unit has an open region behind the blade and between the blade and that housing and also channels for the removal of shaving debris extending upwardly from the open region. The rear wall may have alignment surfaces with which the cutting cutting edge is aligned. The secondary limpet can include a strip that provides a shaving aid, e.g. eg, a lubricant strip. Some embodiments of the invention may include one or more of the following advantages. The distance between the primary cover and the primary cover measured in a tangential plane is greater than the distance between the cutout cover and the cutout cap measured in a tangential plane. The cutting edge of the cutting blade is retracted with respect to the rear wall of the razor blade unit to prevent the user from cutting the skin when handling the razor blade unit. The separate segments of the comb protection facilitate the removal of shaving debris, the trimming of paired and longer hairs, and the provision of precisely located deck surfaces. The inclusion of a trimming sheet and a clipping cover in a common unit attached to a housing of a blade unit of the razor facilitates the precise positioning of the trimming cover with respect to the trimming sheet so that the angle The tangential of the trimming sheet and the separation of the trimming sheet are precise. Other advantages and features of the invention will be apparent from the following description of particular embodiments and the appended 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 perspective view of a razor blade unit of the razor of Figure 1 without the primary razor blades. Figure 4 is a plan view of a trimming unit of the razor blade unit of Figure 3. Figure 5 is a rear elevation of the trimming unit of Figure 4. Figure 6 is a view of the base of the trimming unit of Figure 4. Figure 7 is a front elevation of the trimming unit of Figure 4. Figure 8 is a vertical sectional view taken along line 8-8 of Figure 6 , of the housing of the razor blade unit of Figure 3. Figure 9 is a vertical sectional view taken along line 9-9 of Figure 6, of a portion of the razor blade unit of Figure 3. Figure 10 is a vertical sectional view taken along line 10-10 of Figure 6, of a portion of the razor blade unit of Figure 3. Figure 11 is a view in Figure 3. perspective of the razor blade unit of Figure 3 without the razor blades.

Figure 12 is a perspective view of the rear part of the housing of the razor blade unit of Figure 3. Figure 13 is a perspective view of a component of the blade holder of an alfernative embodiment of a trim unit without the cutout sheet. Figure 14 illustrates the shaving machine of Figure 1 applied to the skin for shaving. Figure 15 illustrates the razor of Figure 1 rotated 90 ° from the orientation illustrated in Figure 14. With reference to Figures 1 and 2, the razor 10 includes a disposable cartridge 12 and a handle 14. The cartridge 12 includes a connecting member 18 which connects the cartridge to a handle 14, and a razor blade unit 16 which is pivotally connected to the connecting member 18. The razor blade unit 16 includes a housing plastic 20, a primary cover 22 on the front of the housing 20, a cover 24 with a lubricating flange 26 on the rear of the housing 20, five elongated razor blades 28 between the primary cover 22 and the primary cover 24 and a housing unit 20. cutting sheet 30 attached to the back of the housing 20 by fasteners 32 which also retain the razor blades 28 in the housing 20. With reference to Figure 3, the cutting blade unit 30 is secured to the back of the housing 20 and includes a blade holder 502 and a trim blade 504 located on that blade holder. The blade holder 502 is made of a stainless steel sheet metal having a thickness of 0.028 cm (0.011") cut and shaped so as to provide structures for attaching it to the housing 20, supporting the cutting blade 504 and for defining surfaces of an Cutout cover and a cutout cap With reference to Figures 3-9, the leaf holder 502 has a rear wall 506, upper tabs 508, 510 curved such that they extend forward at both ends from the top of the rear wall 506, a bottom wall 512 curved in such a way as to extend forward along the length of the rear wall 506 in the lower part of the rear wall 506 and two side portions 514, 516, each of which is formed by a laminar tongue 518 curved so as to extend forward from the respective side at one end of the rear wall 506 and a curved vertical tongue 520 of such that it extends upwards from a respective end of the bottom wall 512. The central portion of the rear wall 506 is opened in its lower portion forming an empty space 522 between the lower end surface 526 of the rear wall 506 and the rear wall 506. trimming cover 528 extending upwards from the bottom wall 512. Two alignment surfaces 530 are located at a precise distance from the bottom of the terminal surface 526 at the two ends of that surface 526. The cutting blade 504 is welded to the inner surface 532 of the wall rear 506 by means of thirteen spot welds 534 and cutting edge 536 of cutout sheet 504 is aligned with alignment surfaces 530. All edges surrounding empty space 524 and which will come into contact with the wearer's skin are rounded and they provide a radius of curvature of 0.2 mm in such a way that the user does not feel the edges. With reference to Figures 3, 5-10, the empty space 522 causes the cutting edge 536 of the cutting blade 504 to be exposed. As best seen in Figure 9, the rear wall 506 and its lower end surface 526 provide a trim cap 535 for the trim sheet 504 and its cutting edge 536 and define the exposure area for the trim sheet 504. With reference to FIGS. 3 and 10, two skin protection projections 537 spaced from the two ends are exposed to the space located above a tangent line from the cutting edge 536 to the cutout cover 528 to limit the volume of user skin that can be bulked in the space located between the cutting edge 536 and the cutout cover 528. With reference to Figures 4 and 6, the upper side tabs 508 and 510 have upper grooves 538 and the lower wall 512 it has aligned slots 540 where the fasteners 30 used to secure the clipping blade unit 30 to the housing 20 are inserted. With reference to Figures 3 and 6, the lower wall R 512 also has cavities 542 that mate with projections 544 of housing 20 to facilitate alignment and maintain unit 30 in the proper position in housing 20. With reference to Figures 3, 6, 8, 9, 11, 12, the lower wall also has four slots for the removal of remnants 546 that are aligned with four ducts for the removal of remnants 548 in the housing 20 useful to eliminate during shaving the remains that remain in the region behind and below. of the cutting edge 536. In order to manufacture the blade holder 506, a sheet of metal is cut and shaped. The cutout sheet 504 is then placed against the inner surface 532 and the cutting edge 536 is aligned with the alignment surfaces 530 using an automatic positioning member, and then secured to the inner surface 532 by means of spot welds 534, with the cutting cutting edge 536 in the precise position with with respect to the clipping cover 528 and the trimming cap 534. The trimming unit 30 is then placed in the rasera part of the housing 20 by sliding it forward on the back of the housing 20 with cavities 542 of the inner wall 512 aligned with projections 544 of the housing 20. Simultaneously, the upper protuberances 552 and the lower protuberances 554 of the housing 20 (Figure 8) are deformed by the compression applied between the upper tabs 508, 510 and the lower wall 512 when the unit 30 moves forwardly on the rear part of the housing 20. Then, the unit 30 is secured to the housing 20 by means of fasteners 32 which pass to íravé s of upper slots 538 and lower slots 540 of blade holder 506 and aligned slots 550 through housing 20. During use, handle 14 of the shaver rotates 180 ° from the position in which it is usually held in such a manner that the thumb is supported on the pad 726 (Figures 14 and 15) on the side near the primary cover 22, and moves the back of the razor blade unit towards the area of the skin that will be shaved with the trim sheet 504 in alignment with the edge of the hairs that will be trimmed, p. eg, in a place where it is desired to shave the lower edge of the pin or an edge of the mustache or beard or under the nose of the user when shaving the hairs of these difficult to shave places. The razor blade unit 16 is located in its rest position with respect to the connecting member 18, and therefore does not rotate when the user presses the back of the razor blade unit 16 and the cutting edge 536 against the skin. and then move it laterally on the skin to trim the hairs. The cut hairs and other shaving debris that pass to the region located beyond the cutting edge 536 during trimming open the dies for removal of debris 548 from the housing 20 and the slots for removal of remnants 546 aligned in the bottom wall during the removal thereof. trimming, and the entire region and ducts and grooves for removing residues are easily cleaned during rinsing with water, e.g. eg between passes of the machine to shave or trim. The cut hairs and shaving residues may also pass through ducts 549 behind the ducts 548 and above the lower wall 512. The location of the cutting edge 536 of the cutting blade 504 with respect to the rear wall 506 of the razor blade unit prevents the user from cutting the skin while using the cartridge 12 and the razor 10. The inclusion of a trim sheet and a trim cover in a common unit coupled to a housing of a blade the razor facilitates the precise location of the trim cover with respect to the trim sheet to provide a precise trimming sheet tangent angle and accurate spacing between trim sheets. With reference to Figure 13, an alternate sheet holder 600 includes a comb cover 602 having spaced segments 604 to facilitate the removal of shaving debris, trimming of the legs and other longer hairs, and allows the inclusion of surfaces of protection located precisely when forming the cover during the manufacturing process. The sheet holder 600 also has rinsing openings 606 to facilitate the removal of sharp hairs between the cutting blade 504 and the housing 20 (see Figure 9). In this embodiment, the space folds the housing 20 and the sheet is larger than the one illustrated in Figure 10 to facilitate the removal of cut hairs and shaving debris. With reference to Figures 14 and 15, the handle 14 includes a single moderate curve 720 at the end, concave on the same side in which the primary leaves 28 are located. The handle 14 is bifurcated into two portions 722, 724 so that an empty region is formed between for the user to have access to the finger pad 726 located on the concave side of the curve 720. The moderate curve 720 located on the same side as the primary leaves and the finger pad 726 and access to the pad 726 that provides the bifurcated handle allows the user to place the thumb or other finger in line with the cutout sheet 504 and directly below that sheet 504 located at the corner 728 illustrated in Figure 14 when the user trims the whiskers, whiskers or other hairs of your skin 730. The finger pad 726 is made of an elastomeric material and has projections that provide an adequate connection. The inner surfaces 732, 734 of the portions 722, 724 are released to allow access to the finger pad 726. With a razor of this type, the skin contact area encompassed by the primary cover 22, the primary sheets 28 and the primary cap 24 may be relatively large while the skin contact area encompassed by the trim cover 528, the trim sheet 504 and the trim cap 535 on the back of the sheet unit Shaving 16 is practically smaller, but nevertheless allows the blade unit to be used to safely shave areas of the skin that are difficult to shave by the prominent features of the face adjacent to them. Accordingly, the distance between the primary cover 22 and the primary cover 24 measured in a plane tangential to it is greater than the distance between the cutout cover 528 and the cutout cap 535 measured in a tangential plane. The razor blade unit 16 also has a conduit through which the flushing water flow passes to allow efficient removal of the soap and shaving debris from the bottom of the cut sheet 504 so that the flush is not produced. obstruction of some space in the lower part of the blade and hinder the performance of the cutting blade 504. Furthermore, since the conduit opens in the lower face, the remains of the shaving will flow away from the upper face in such a way that cut hairs will not be clogged or contaminate the skin contacting surfaces in the upper part, such as on the surface of a lubricating strip 26 of the primary cap 24. Other embodiments of the invention are within the scope of the appended claims. For example, the configuration of the sheet metal sheet holder with the bonded sheet can be used in other applications for cutting the hair, and the sheet holder defines a sheet protection and / or cover that is placed precisely. Likewise, the trimming cap may have an index as an aid for shaving, e.g. eg, a lubricant iira.

Claims (34)

1. One blade unit of the razor; the unit comprises: A housing with a primary cover in a front part of the housing and a primary cover in an upper surface of a rear part of the housing, one or more primary razor blades in the primary cover and the primary cover, a rear wall having an outer rear surface extending downwardly from the upper surface of the rear part of the housing to a terminal surface, and a trim sheet which is located in the rear wall and which has a cutting cutting edge which extends to the end wall. less partially beyond the terminal surface within an imaginary extension of the outer rear surface; the outer rear surface defines a cutout cap for the cutout sheet.

2. One blade unit of the razor; the unit comprises: A housing with a primary cover on a front part of the housing and a primary cover on a top surface of a rear part of the housing, one or more primary razor blades between the primary cover and the primary cover, a rear wall at the back of the housing, a trimming blade which is located at the rear of the housing and which has a cutting cutting edge, and a protection of the trimming comb which is located in the iris part of the housing and which has segments of Separate protection.

3. One blade unit of the razor; the unit comprises: A housing with a primary cover on a front part of the housing and a primary cover on a top surface of an upper part of the housing, one or more primary sealing sheets between the primary cover and the primary cover, and a unit of clipping attached to the back of the housing; the unit includes a cutting sheet having a cutting cutting edge and a cutting cover at a predetermined position with respect to the cutting cutting edge to define a cutting sheet spacing and an angle of the cutting sheet.

4. An element for cutting hair; the element comprises: A sheet holder made of a cut and formed metal sheet, and a sheet welded to the sheet holder, the sheet holder defines a cover or a cover for the sheet.

5. The unit according to claim 1, further comprising a trim cover at the rear of the housing; The trim cover is located within the imaginary extension of the outer rear surface.

The unit according to claim 5, further characterized in that the housing has a bottom; the trim cover includes flow conduits for the removal of shaving debris extending from a region located behind an imaginary surface extending from the trim cap to the trim cover to the bottom of the housing.

The unit according to claim 1 or 3, further comprising one or more skin protection structures between the cutting cover and the cutting cutting edge.

The unit according to claim 1 or 3, further comprising two or more skin protection structures between the trim cover and the cutting cutting edge.

9. The unit according to claim 1, further characterized in that the rear wall is completely formed of the same material as the housing.

10. The unit according to claim 1, further characterized in that the rear wall is located in a separate component joined to the housing.

The unit according to claim 10, further characterized in that the housing is made of plastic and the rear wall is made of metal.

12. The unit according to claim 1, further characterized in that the rear wall has an interior surface and the trim sheet is located on the interior surface.

13. The unit according to claim 12, further characterized in that the sheet is welded to the inner surface.

The unit according to claim 3, further characterized in that the trim cover is a protection of the trim comb including separate protection segments.

15. The unit according to claim 5, further characterized in that the trimming cover is a protection of the trimming comb which includes separate protection segments.

16. The unit according to claim 2, 14 or 15, further characterized in that the protection of the cutting comb is made of a metal sheet cut and formed.

The unit according to claim 1, 2 or 3, further characterized in that the unit has an open region behind the sheet and between the sheet and the housing and also has channels for the removal of the shaving remnants that extend up from the open region.

18. The unit according to claim 2, further characterized in that the unit includes a trimming blade holder that provides the trimming cap, and the housing is made of plas- tic and the blade support is made of metal.

19. The unit according to claim 18, further characterized in that the cutting blade holder has an inner surface and the cutting blade is located on the inner surface.

20. The unit according to claim 19, further characterized in that the sheet is welded to the inner surface.

21. The hair cutting element according to claim 4, further characterized in that the blade holder defines a cover and a lid for the blade.

22. The hair cutting element according to claim 21, further characterized in that the sheet holder has an inner surface and the cutting blade is welded to the inner surface.

23. The hair cutting element according to claim 22, further characterized in that the cover is a protection of the trim comb including separate protection segments.

24. The unit according to claim 12, further characterized in that the rear wall has alignment surfaces with which the cutting edge is aligned.

25. The unit according to claim 19, further characterized in that the blade holder has alignment surfaces with which the cutting edge is aligned.

26. The element according to claim 22, further characterized in that the blade holder has alignment surfaces with which the cutting edge is aligned.

27. The unit according to claim 1, further characterized in that the trimming cap includes a strip that provides an auxiliary for shaving.

28. The unit according to claim 2 or 3, further characterized in that the posi- terior part of the housing includes a trimming cap that has an opening that provides an auxiliary for shaving.

29. The unit according to claim 1, 2 or 3, further characterized in that it has three or more of the primary razor blades.

30. The unit according to claim 1, 2 or 3, further characterized in that it has four or more of the primary razor blades.

31. The unit according to claim 1, 2 or 3, further characterized in that it has five or more of the primary razor blades.

32. The element according to claim 5 or 6 further characterized in that a primary dissipation between the primary cover and the primary cover measured in a tangential primary plane is greater than the distance between the cut-out cover and the cut-out cap measured in a tangential cut plane.

33. The unit according to claim 3, further characterized in that the trimming unit includes a trimming cap, and because a primary distance between the primary cap and the primary cap measured in a tangential primary plane is greater than the distance between the primary cap and the primary cap measured in a tangential primary plane. the cutout cover and the cutout cap measured in a plane of tangential cutout.

34. The unit according to claim 33, further characterized in that the housing has a bottom; The trim cover includes flow conduits for removing shaving residues that extend from a region located away from an imaginary surface extending from the trim cap to the trim cover to the bottom of the housing.