US3852883A

US3852883A - Shaving unit for safety razor

Info

Publication number: US3852883A
Application number: US00424255A
Authority: US
Inventors: F Ferraro
Original assignee: Warner Lambert Co LLC
Current assignee: Warner Lambert Co LLC
Priority date: 1973-01-23
Filing date: 1973-12-13
Publication date: 1974-12-10
Anticipated expiration: 1991-12-10

Abstract

The specific disclosure provides a shaving unit having a spacer which includes a pair of spaced forwardly extending projections. A bottom razor blade is connected to the underside of the spacer with its cutting edge positioned beneath the projections or forwardly of the projections. A top razor blade is connected to the upperside of the spacer with its cutting edge positioned above the projections and rearwardly of the cutting edge of the bottom blade. Each one of the spacer projections includes a raised portion extending upwardly in front of a respective end of the cutting edge of the top razor blade.

Description

iinite States Patent. [191 Ferraro [22]. Filed:

[73] Assignee: Warner-Lambert Company, Morris Plains, NJ.

Dec. 13, 1973 [21] Appl, No; 424,255

Related Application Data [63] Continuation-impart of Ser. No. 408,848, Oct. 23, 1973, abandoned, which is a continuation-in-part of Serl No. 398,104, Sept. 17, 1973.

[30] Foreign Application Priority Data Jan. 23, 1973 Great Britain .2 3365/73 52y U.s.,c1...; ..;.30/346.s8,"30/50, 76 [51] Int. Cl. ..B26b 21/54, B26b 21/22 [58] Field of Search 30/50, 76, 346.57, 346.58, 30/346.59

[56] References Cited 7 UNITED STATES PATENTS 2,019,475 11/1935 Baudis 30/346.59 X 2,713,201 7/1955 Plesch 30/346.57 X

[451 Dec. 10, 1974 3,262,206 7/1966 Tomek; 30/346.59 3,783,510 1/1974 Dawidowicz 30/50 X 3,786,563 l/1974 Dorion 30/50 FOREIGN PATENTS OR APPLICATIONS 4/1957 Great Britain 30/50 Primary ExaminerAl Lawrence Smith Assistant Examiner-Gary L. Smith Attorney, Agent, or FirmJames F. Powers, Jr.; Albert H. Graddis [57] ABSTRACT The specific disclosure provides a shaving unit having a spacer which includes a pair of spaced forwardly ex tending projections. A bottom razor blade is connected to the underside of the spacer with its cutting edge positioned beneath the projections or forwardly of the projections. A top razor blade is connected to the upperside of the spacer with its cutting edge positioned above the projections and rearwardly of the cutting edge of the bottom blade. Each one of the spacer projections includes a raised portion extending upwardly in front of a respective end of the cutting edge of the top razor blade.

20 Claims, 14 Drawing Figures PATENTEDUEEIOlBM SHEETIUF 3 3,852,883

PATENTEDUEC 10 I974 SHEET 2 OF 3 Jill PATENTEU DEC 10 I974 SHEET 3 0f 3 CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of copending US. Pat. application Ser. No. 408,848, filed Oct. 23, 1973, now abandoned which, in turn, is a continuation-in-part of co-pending US. Pat. application Ser. No. 398,104, filed Sept. 1973 BACKGROUND OF THE INVENTION the razor stops to prevent nicks and cuts from the ends of the lower blade.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view of an embodiment of a shaving unit constructed in accordance with the present invention;

FIG. 2 is a top plan view of the shaving unit embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the shaving unit taken along Lines 3-3 of FIG. 2

FIG. 4 is a cross-sectional view of another embodiment of a shaving unit constructed in accordance with the present invention;

FIG. 5 is a cross-sectional view of an embodiment of the present'invention taken along Lines 5-5 of FIG. 6;

FIG. 6 is a top plan view of an embodiment of the invention showing blade and spacer orientation means;

FIG. 7 is a cross-sectional view of an embodiment of v the invention for bonding the blades and spacer toting edge blades to a safety razor from a separable dispenser are well known in the art and are commercially available. For example, dispensers such as described in us. PatfNos. 2,911,713 and 2,812,576'have an elongated key that is positioned in the head ofa safety razor such as disclosed in US Pat. Nos. 2,911,713, 2,911,714, 3,128,551, 3,177,581 and 3,203,093 to wedge apart a cap and a blade seat in the razor head. A finger-operated slide on the dispenser is then used to insert a blade between the cap and blade seat. After the key is removed from the razor head, the blade seat moves in the direction of the cap to clamp the blade between the blade seat and the cap, and to bias the cutting edge of the blade against a pair of spaced stops on the blade seat or cap. I

Tomek US. Pat. No. 3,262,206 describes a shaving unit consisting of a pair of-tandemly mounted single cutting edge blades which are vertically separated by a plastic spacer having a forward surface spaced inwardly from both cutting edges. The plastic spacer of Tomek has plastic posts extending through perforations in the two blades to bond the blades thereto. If the shaving unit of Tomek is clamped and biased against blade seat stops in the above-described razors, the ends or corners of'the top blade cutting edge are set back from the razor stops to raise a risk of nicks andcuts from such ends or corners during use.

SUMMARY OF THE INVENTION In accordance with an aspect of the present invention, there is provided a shaving unit for a safety razor wherein the razor comprises a guard bar, spaced stop members for locating the shaving unit relative to the guard bar, and means for biasing the shaving unit to the stop members. The shaving unit comprises a razor blade having a cutting edge positioned upwardly and rearwardly of a cutting edge on another razor blade. Means interconnect the two blades for vertically spacing the blades apart. Means extend forwardly from the spacing means and in front of each end of the cutting edge of the upper blade for preventing contact with the.

ends of the upper blade cutting edge during use to thereby prevent nicks and cuts from such ends. In accordance with another aspect of the present invention, I

the outer ends of the lower blade are located behind gether;

FIGS. 8 and 9 are cross-sectional views showing another embodiment for bonding the blades to a plastic spacer;

FIG. 10 is a cross-sectional view of bodiment seated in a safety razor;

FIG. 11 is a front elevational view of the razor and shaving unit of FIG. 10;'

FIG. 12 is an exploded view of yet another embodiment of a shaving unit constructed in accordance with the present invention;

FIG. 13 is a top plan view of the emodiment of FIG. 12; and

FIG. 14 is a cross-sectional view taken 13-13 of FIG. 13.

DESCRIPTION OF SPECIFIC EMBODIMENTS the FIG. 1 cmalong Lines spacer member 12 The spacer member 12 has a pair of spaced forwardly extending

projections

17, 18 at the outer ends thereof, and a plurality of forwardly extending teeth 16 between the projections l7, 18. The cuttingedge 15 of the bottom blade 13 is positioned forward of the projections l7, l8, and the cutting edge 14 of the top blade 11 is positioned above the projections l7, l8 and rearwardly of the cutting edge 15 of the bottom blade 13. Each one of the projections l7, 18 has a raised

portion

1, 2 extending upwardly in front of the outer ends or corners of the cutting edge 14 of the top blade 11 to prevent nicks and cuts from such ends.

As shown in FIG. 3, the forward extension of the teeth 16 is terminated short of the cutting edge 14 of the top blade 11. However, the upper surfaces of the teeth 16 can alternatively be beveled, and the beveled surfaces can thenextend forwardly a slight distance from beneath the cutting edge 14 of the top blade 11. Spaces 19 formed between the teeth 16 are in fluid 1 communication with elongated perforations 20 formed pair of spaced elongated slots which may be used as an the cut-out portions 8 are aligned as shown in FIG. 2 to orient the blades 11, 13 and the spacer member 12 prior to bonding the blades 11, 13 to the spacermember 12. v

In the embodiment shown in FIGS. 1-3, the blades 11, 13 are bonded to the spacer member 12 by a plurality of spot welds 22. Alternatively, the spacer member 12 can have a plurality of .upwardly extending and downwardly extending projections having a height of approximately 0.003 inch. In this alternative embodiment, the blades 11, 13 are bonded to the spacer member 12 by a projection welding process such as described in Metals Handbook, Vol. 6 Welding and Brazing, Page 445, American Society for Metals, Metals Park, Ohio 44073, l97l.

The raised

portions

1,2 of the FIGS. 1 3 embodiment are spaced a slight distance forwardly of the cutting edge 14 of the top blade 11. FIG. 4 is a modification of the embodiment of FIGS. 1 3 wherein the

projections

17, 18 of FIGS. 1 3 are upwardly deformed to provide stops 23 against which the outer ends of the' cutting edge 14 of the top blade 11 are seated. The stops 23 may be used as an aid to orient the top blade cutting edge 14 with respect to the spacer member 12 and the bottom blade cutting edge 15. Further, the stops 23 also prevent nicks and cuts from the outer ends or corners of the top blade cutting edge 14.

FIGSv 5 and-6 show another modification of the embodiment of FIGS. 1 3 wherein-the spacer member 12 has a pair of upwardly extending

posts

31, 35 which are located in the outer portions of the

top blade slots

30, 33, and a pair of downwardly extending

posts

32, 34 which are located in the innermost portions of the bottom blade slots. The

posts

31, 32, 34, 35 are used to orient the blades 11, 13 with respect to the spacer member 12.

FIG. 7 shows another embodiment of the present invention wherein the top .and bottom blades 11', 13' have a plurality of

beveled holes

40, 41. The spacer member 12 is upwardly and downwardly deformed 46,

100 of the

blades

81, 82 and the spacer 80, and the

blades

81, 82 are then bonded to the spacer member 80 by a plurality of spot welds diagrammatically represented as 90, 92, 94 or by projections welding such as described hereinabove with respect to the embodiment of FIGS. l-3.

The cutting edge 89 of the bottom blade 82 is positioned forwardly of the

projections

86, 87 of the spacer, and the cutting edge 88 of the top blade 81 is positioned above the

projections

86, 87 and rearwardly of the bottom blade cutting edge 89. The outer ends or corners of the top blade cutting edge 88 are positioned behind raised

portions

110, 112 formed on the

projections

86, 87 to prevent nicks and cuts from the corners of the top blade cutting edge 88 during use. The rear edge 83 of the spacer 80 extends rearwardly of the rear edge 85 of the bottom blade 82, and the rear edge 84 of the top blade 81 extends rearwardly of the rear edge 83 of the spacer.

The shaving units of the present invention can be dispensed from a modified form of well-known and commercially available single edge blade dispensers. Single edge blade dispensers are described in many patents such as U.S. Pat. Nos. 2,911,713 and 2,812,576. The

dispenser modifications essentially consist of thickening an elongated key of the dispenser such that a wedging action occurs between a cap portion of the razor head and a blade seating plate of the razor to permit insertion of the shaving unit between the cap portion and the seating plate. It is also apparent that a blade exit slot of the well-known single edge blade dispenser must be dimensioned to permit removal of shaving units therefrom under the action of a finger-operated pusher.

48 by a punch or the like inserted through

holes

45, 47

toform relatively flat-headed

rivets

43, 44 in the

beveled holes

40, 41.

- FIGS. 8 and 9 show another embodiment ofthe presentinvention wherein the spacer 50 is formed of plastic and has a plurality of

posts

51, 52 extending upwardly and downwardly through beveled holes.53, 54 formed.

in the top and bottom blades 11", 13". The

posts

51, 52 are staked or compressed in any known manner, such as by ultrasonics, heat and/or pressure, tofill out the

beveled holes

53, 54 as shown in FIG. 9.

With reference to. FIGS. 12-14, the shaving unit 79 hasapproximately equally dimensioned top and

bottom blades

81, 82. A significant difference between the top and bottom blades is that the top blade 81 distance between the rear edge 84 and the cut-out portions 98 is greater than the bottom blade 82-distance between its rear edge 85 and its cut-out portions 100. The

blades

81, 82 and the spacer 80 have a pair of

elongated slots

95, 96, 97 which may be used for handling the components during manufacture. The unit 79 of FIGS. 12-14 is assembled by aligning the cut-out

portions

98, 99,

Company. The razor shown in FIG. 10 functions essentially in the same manner as the razor disclosed in U.S. Pat. No. 2,91 1,713, which patent is incorporated herein by reference. 7

With reference to FIGS. 10 and 11, the razor head 60 has a frame member 61 having a forwardly extending cap in transverse line contact with the top blade 11 at point 65. From point 65, the underside of the cap is beveled at 66 away from the top blade 11. The head 60 also includes a blade seating plate having a generally flat forwardly projecting flange 69 underlying the cap of the frame 61 to constitute the blade seat for the shaving unit. The seat 69 terminates along its front edge in a downwardly curved serrated guard bar 63. Behind the guard bar 63 is a clearance opening 64 formed in the seat 69. An upwardly extending blade stop 62 is formed on the seat 69 at each end of the guard bar 63. The stops 62 each have a vertical surface 68 against which the forwardly extending

projections

86, 87 are biased. The outer ends or corners of the bottom blade cutting edge 15 are located behind the razor stops 62. At least one indent 67 is formed in the frame 61 for abutting engagement with the rear edge of the top blade 11. As described in U.S. Pat. No.2,9l 1,713, an upper part of a spring 71 bears against a flange portion 70 of the blade seating plate to clamp the seat 69 both upwardly and rearwardly such that the shaving unit is firmly clamped between the cap line-contact ca] surfaces 68 of the spaced stops 62 by the indent 67.

tween about 0.010 to about 0.026 inches. Suitable dimensions for the embodiment of the shaving unit shown in FIGS. 1-3 are provided in FIG. 10.

The shaving unit of FIGS. 12-14 can be suitably constructed of a 0.006 inch by 1.50 inch by 0.31 1 inch top razor blade 81, a 0.006 inch by 1.50 inch by 0.296 inch I bottom razor blade 82, and a spacer member 80 having dimensions of 0.008 inchby 1.50 inch by 0.318 inch, such that the vertical height between the cutting edges 88, 89 is 0.014 inch. Further, the horizontal distance between the cutting edges 88, 89 can be 0.037 inch, and the horizontal distance between the cutting edge 89 of the bottom blade 82 and the front edges of the

projections

86, 87 can suitably be 0.125 inch. Still further, the upwardly extending raised

portions

110, 112 on the

projections

86, 87 discussed hereinabove can suitably extend upwardly 0.005 inch to avoid nicks and cuts from the corners of thetop blade cutting edge 88.

The slots 95 in the spacer 80 can be eliminated, and a perforation can be formed off-center of the spacer 80 for orienting the spacer 80 during assembly.

The razor blades of each one of the foregoing embodimentscan be composed of martensitic stainless steel commonly used for razor blades, or of any other material suitable for razor blades. The spacer may be composed of plastic as described with reference to FIGS. 8 and 9, or of metal such as stainless steel or aluminum. Suitable spacer stainless steels are American Iron and Steel Institute Types 302 or 430.

The present invention also contemplates more than two single edge blades tandemly arranged with the spacers therebetween providing blade corner guards l, 2; 110, 112.

What is claimed is: j

l. A replaceable shaving unit for a safety razor, wherein said razor comprises a transverse guardsurface. spaced stop means for locating said shaving unit with respect to said guard surface, a blade seat member, a cap member extending forwardly above said blade seatmember, and means for biasing said shaving unit in abutting engagement with said stop means and said blade seat member upwardly to clamp said shaving unit between said cap and said blade seat member, said shaving unit comprising:

a. a spacer member including a transversely elongated center portion, a pair of spaced projections extending forwardly from said center portion, a raised portionon each one of said projections, an underside, and an upper side; b. a first razor blade connected to said underside, said first razor blade including a lower surface for abutting engagement with said blade seat member and an elongated cutting edge dimensioned for locating each outer end thereof behind a respective one of said stop means to prevent contact with the ends of the first blade cutting edge during use; and

c. a second razor blade connected to said upper side, said second razor blade including an upper surface for abutting engagement with said cap member and an elongated cutting edge positioned above said projections and rearwardly and parallelly with the cutting edge of said bottom razor blade, the cutting edge of said second razor blade having each outer end thereof located behind and spaced rearwardly from a respective one of the raised portions to prevent contact with the ends of the second blade cutting edge during use;

d. said second razor blade having a predetermined thickness, and the raised portions extending upwardly from said projections a distance less than said predetermined thickness.

2. The shaving unit of claim 1, wherein said spacer member further includes a plurality of teeth between said projections, said teeth extending forwardly from said center portion for a distance less than the forward extension of said projections.

3. The shaving unit of claim 2, wherein said first razor blade further includes a plurality of perforations between said teeth..

4. The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a transversely elongated slot, the slots being vertically aligned; and wherein said spacer member further in-' said second razor blade, and the other of said posts extending downwardly into the end of the slot in said first razor blade opposite said one end.

5. The shaving unit of claim 4, wherein each one of said first and second razor blades further includes another transversely elongated slot, the another slots being vertically aligned; and wherein said spacer member further includes another pair of transversely spaced posts, one of said another posts extending upwardly into one side of the another slot in. said second razor blade, and the other of said another posts extending downwardly into the side of the another slot in said first razor blade opposite said one side.

6. The shaving unit of claim 1, wherein said first razor blade has a blunt rear edge positioned beneath said center portion, and wherein 'said second razor blade has a blunt rear edge positioned rearwardly of said center portion.

7. The shaving unit of claim 6, wherein said center portion of said spacer member includes a transverse rear surface positioned forwardly of the blunt rear edge of said second razor blade.

8. The shaving unit of claim 7, wherein said first and second razor blades have unequal distances from respective cutting edge to blunt rear edge.

9. The shaving unit of claim 7, wherein said first and second razor blades have identical length, width and thickness dimensions.

10. The shaving unit of claim 8, wherein each one of said first and second razor blades has a thickness of 0.006 inch, and wherein said spacer member has a thickness of 0.08 inch.

11. The shaving unit of claim 7, wherein the cutting edge of said second razor blade is in a horizontal plane 0.014 inch above another horizontal plane defined by .the cutting edge of said first razor blade.

and second razor blades have a spacing therebetween of about 0.33 inch to about 0.41 inch.

13. The shaving unit of claim 1, wherein said first and second razor blades are connected to said spacer member by a plurality of spot welds.

14. The shaving unit of claim 1, wherein said first and second razor blades are connected to said spacer memher by a plurality of projection welds, the weld projections being initially formed on said spacer member.

15. The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a plurality of apertures, and wherein said center portion of said spacer member is deformed through-said apertures to connect said first and second razor blades to said spacer member by integral rivets.

16. The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a plurality of apertures, and wherein said center portion of said spacer member has a plurality of posts extending through said apertures, said posts being deformed at the outer ends thereof to connect said first and second razor blades to said spacer.

17. The shaving unit of claim 1, wherein a pair of vertical planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of from about 0.035 inch -to about 0.055 inch.

18. The shaving unit of claim 17, wherein a pair of horizontal planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of from about 0.01 inch to about 0.026 inch.

19. The shaving unit of claim 6, wherein the distance between the cutting edge and the blunt rear edge of said second razor blade is greater than the distance between the cutting edge and the blunt rear edge of said first blade. 7

20. The shaving unit of claim 1, wherein the thickness of one of said second and first razor blades is less than the thickness of the other of said second and first razor blades.

Claims

1. A replaceable shaving unit for a safety razor, wherein said razor comprises a transverse guard surface, spaced stop means for locating said shaving unit with respect to said guard surface, a blade seat member, a cap member extending forwardly above said blade seat member, and means for biasing said shaving unit in abutting engagement with said stop means and said blade seat member upwardly to clamp said shaving unit between said cap and said blade seat member, said shaving unit comprising: a. a spacer member including a transversely elongated center portion, a pair of spaced projections extending forwardly from said center portion, a raised portion on each one of said projections, an underside, and an upper side; b. a first razor blade connected to said underside, said first razor blade including a lower surface for abutting engagement with said blade seat member and an elongated cutting edge dimensioned for locating each outer end thereof behind a respective one of said stop means to prevent contact with the ends of the first blade cutting edge during use; and c. a second razor blade connected to said upper side, said second razor blade including an upper surface for abutting engagement with said cap member and an elongated cutting edge positioned above said projections and rearwardly and parallelly with the cutting edge of said bottom razor blade, the cutting edge of said second razor blade having each outer end thereof located behind and spaced rearwardly from a respective one of the raised portions to prevent contact with the ends of the second blade cutting edge during use; d. said second razor blade having a predetermined thickness, and the raised portions extending upwardly from said projections a distance less than said predetermined thickness.

3. The shaving unit of claim 2, wherein said first razor blade further includes a plurality of perforations between said teeth.

4. The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a transversely elongated slot, the slots being vertically aligned; and wherein said spacer member further includes a pair of transversely spaced posts, one of said posts extending upwardly into one end of the slot in said second razor blade, and the other of said posts extending downwardly into the end of the slot in said first razor blade opposite said one end.

5. The shaving unit of claim 4, wherein each one of said first and second razor blades further includes another transversely elongated slot, the another slots being vertically aligned; and wherein said spacer member further includes another pair of transversely spaced posts, one of said another posts extending upwardly into one side of the another slot in said second razor blade, and the other of said another posts extending downwardly into the side of the another slot in said first razor blade opposite said one side.

6. The shaving unit of claim 1, wherein said first razor blade has a Blunt rear edge positioned beneath said center portion, and wherein said second razor blade has a blunt rear edge positioned rearwardly of said center portion.

11. The shaving unit of claim 7, wherein the cutting edge of said second razor blade is in a horizontal plane 0.014 inch above another horizontal plane defined by the cutting edge of said first razor blade.

12. The shaving unit of claim 10, wherein a pair of vertical planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of about 0.33 inch to about 0.41 inch.

14. The shaving unit of claim 1, wherein said first and second razor blades are connected to said spacer member by a plurality of projection welds, the weld projections being initially formed on said spacer member.

15. The shaving unit of claim 1, wherein each one of said first and second razor blades further includes a plurality of apertures, and wherein said center portion of said spacer member is deformed through said apertures to connect said first and second razor blades to said spacer member by integral rivets.

17. The shaving unit of claim 1, wherein a pair of vertical planes defined by the cutting edges of said first and second razor blades have a spacing therebetween of from about 0.035 inch to about 0.055 inch.

19. The shaving unit of claim 6, wherein the distance between the cutting edge and the blunt rear edge of said second razor blade is greater than the distance between the cutting edge and the blunt rear edge of said first blade.