US2593306A

US2593306A - Safety razor

Info

Publication number: US2593306A
Application number: US723355A
Authority: US
Inventors: Jacobsen Edwin
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-01-21
Filing date: 1947-01-21
Publication date: 1952-04-15
Anticipated expiration: 1969-04-15

Description

April 15, 1952 E. JACOBSEN 2,593,306

SAFETY RAZOR Filed Jan. 21, 1947 2 SHEETS-SHEET l II I] IN VEN TOR.

April 15, 1952 E. JACOBSEN 2,593,306

' AAAAAAAAA OR Filed Jan. 21, 1947 2 SHEETS--SI-IEET 2 I \8 W" mi gijlyw WWII $1M If mul m M M; [Nu him mm 1 Patented Apr. 15, 1952 UNITED STATES PATENT OFFICE 2,593,306 SAFETY RAzoa Edwin Jacobsen, Altadena, Calif. Application January 21, 1947, Serial No. 723,355

This invention relates to safety razors adapted to hold the thin flexible type of razor blade by blade clamping members, and to the combination of such a blade with blade clamping men bers. While I disclosed this type of bladein my copending application entitled Safety lft'azorsf Serial No. 715,325, now abandoned, filed by main the United StatesPatent Office Decemberli 1946, it is desirous to provide a safety razor" and blade having the foregoing advantages, and in which the blade is bowed. This provides a safety razor which holds the fibers of the blade normal to its cutting edges in simple tension while still bowing so that both edges of the blade present proper angles to the central handle.

The primary object of the invention is to provide a safety razor and blade wherein the blade is bowed and all the fibers of the blade are held in tension.

A further object of the invention is to provide a safety razor wherein the press plate combines to form the blade and exert tension on all its fibers.

A further object of the invention is to provide a blade that may be bowed with all its fibers in tension, that may be held in use between blade clamping members of a safety razor.

With these and incidental objects in view the invention consists in certain novel features of construction and combination of parts, a preferred form of which is hereinafter shown with reference to the drawings which accompany and form a part of this specification.

In the drawings:

Fig. 1 is an enlarged view of the head end of the razor.

Fig. 2 is a further enlarged fragmentary cross sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged side elevation of the resilient cap member removed from the razor and a cross section of the blade.

Fig. 4 is an enlarged blade side view of the resilient cap member showing all the tension lugs.

Fig. 5 is an enlarged blade side view of the guard member.

Fig. 6 is an enlarged plan view of the blade re moved from the razor.

Referring more particularly to the drawings, wherein l is the blade which is held between the guard 2, and the cap member 3. These members are clamped together by the threaded handle 4, and the stud 5, which is secured to the cap member 3. The blade I isnormally flat and of the thin resilient type having the central hole 5,

4 Claims. (Cl. 30-40) lit Lid

through which the stud 5 passes. The cutting edges 1 of the blade are conventional and require no further explanation. The square apertures 8 are provided for holding the fibers of the blade normal to the cutting edges in tension when in use. The handle 4 is the conventional one used on razors having blade clamping members. The cap member 3 is made of a resilient material such as spring steel and when removed from the razor takes its normal form as shown in Fig. 3. The lugs 9 are secured to the cap member 3 and are adapted to freely pass through the apertures 8 of the blade which is also shown in Fig. 3. The reliefs 10 are provided so that the desired. resilience may be obtained without sacrificing the rigidity of the cap member 3. The guard 3, has the central hole I I, through which the stud 5 passes. The curved blade form surface l2, terminates in the form of shoulders l3, at which point the marginal guides 14 are formed. The apertures I5 are provided to register with the apertures 8 of the blade and provide working space for the lugs 9. These apertures are a little longer than the ones in the blade, thus providing clearance for the lugs 9. I also provide the relief slots l6, and the serrations l1.

After the guard 2 is placed on the assembly of the cap member and blade shown in Fig. 3, the cap member 3 is drawn against the blade I pressing it adjacent to the form surface ll of the guard 2. As the stud 5 is drawn tighter by the handle 4 the cap member 3 begins to flatten out causing the lugs 9 to contact the edges l8 of the apertures 8 of the blade. As this action is continued the blade is stretched over the blade form surface 12 obviating the well known bending stresses by placing all the fibers of the blade in tension. This is advantageous as it obviates blade breakage due to bending stresses as well as the necessity for annealing any part of it.

While the form of mechanism herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the form of embodiment herein shown and described as it is susceptible of embodiment in various forms, all coming within the scope of the claims which follow.

What I claim is:

1. In a razor the combination of: a guard member with a laterally convex upper face; a thin flexible blade adapted to be supported on said guard member; marginal overhead members for engaging edge portions of said blade when so supported; a mechanism on said razor for moving said marginal members towards said guard member to cause said overhead members to engage cutting edge portions of said blade to arch the latter and to press said edge portions into engagement with said convex face, said marginal members being yieldably related to said mechanism whereby said members are spread apart after having pressed said blade edge portions into engagement with said convex face; and interlocking means on said marginal members and said edge portions of said blade whereby said marginal members in spreading apart as aforesaid; transmit positively to said blade a stretching tension in the metallic structure thereof tangential to the arched contour of said blade and along lines normal to the cutting edge portions. 1

2. In a razor the combination of: a relatively rigid guard member with a laterally convex upper face; a thin flexible blade adapted to be supported on said guard member pressed into arched conformation with said face, said blade having cutting edge portions which extend laterally out of contact with said guard when said blade is so pressed; marginal overhead members for engaging said edge portions of said blade; means on said razor for moving said marginal members towards said guard member to engage said blade edge portions and arch said blade into conformity with said face and to move said marginal members transversely outwardly with respect to said edge portions of said blade; and interlocking means on said marginal members and said edge portions of said blade whereby said marginal members incidental to said transverse relative movement aforesaid, engage and interlock with said blade edge portions and apply spreading forces to the latter to transmit positively to said blade a stretching tension in the metallic structure thereof tangential to the archedcontour of said blade and along lines normal to said cutting edge portions.

3. A combination as in claim 2 in which said marginal overhead members are flexibly united with a cap so as to be normally inclined towards said guard from said cap, in which said blade edge portions are slidable transversely relative to said guard after said blade has been pressed into conformation with the latter, and in which said transverse relative movement between said overhead members and said blade edge portions aforesaid results from movement of said cap towards said guard and the yielding of said overhead members relative to said cap, said yielding taking place substantially after said overhead members have pressed said cutting edge portions of said blade into engagement with said guard, and bringing into operation said interlocking means on said overhead members and said blade edge portions to slide the latter transversely in opposite directions over the portions of said guard engaged thereby, to the extent necessary to effect a tension produced as aforesaid within the metallic structure of said blade.

4. A combination as in claim 3 in which openings are provided in said guard beneath said blade when the latter conforms to said face, said interlocking means including holes provided in said blade which are disposed over said openings and inwardly from outer edges of the latter when saidblade initially conforms to said face, and lugs provided on said overhead members and extending downwardly therefrom into saidholes and into engagement with edges of said holes disposed outwardly whereby said lugs transmit said stretched tension to said blade when said overhead members are shifted apart transversely as aforesaid.

EDWIN JACOBSEN.

vREFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 949,205 Wetmur Feb. 15, 1910 1,221,065 Lutz Apr. 3, 1917 1,496,296 Chance June 3, 192% 2,047,553 Falk July 14, 1936 2,138,063 Hotson Nov. 29, 1938 2,241,986 Driess et al. May 13, 1941 2,314,564 Testi Mar. 23, 1943 FOREIGN PATENTS Number Country Date 450,813 France Jan. 28, 1913