FiledTuesday, 9th August 1938
PublishedTuesday, 20th January 1942
InventorSamuel C. Stampleman
OwnerGillette Safety Razor Company
Parts not referenced in the text: None
Parts not referenced in the images: None
This invention relates to safety razors of the type in which a thin flexible blade is clamped for support between cap and guard members. The present invention relates more particularly to the structure of these members and its general object is to provide a construction in which sheet metal may be utilized as distinguished from the solid swaged or machined constructions heretofore used.
The cap and guard members are relied upon not only for shaping and supporting the thin flexible cutting blade when it is clamped between them for shaving but they determine also the edge exposure of the razor. This is a critical dimension since too great edge exposure renders the razor dangerous and too little exposure renders it uncomfortable and inefficient in shaving. The tolerance limits for edge exposure are in the order of .001″ to .002″ and it is, consequently, important that the cap and guard should be manufactured with considerable accuracy, and should be of sufficiently rigid construction to maintain their shape without variation during the life of the razor. On account of these considerations it has been the practice heretofore to fashion the cap and guard members from solid stock as by swaging or machining bar stock. Sheet metal has not heretofore been considered entirely satisfactory as a material for these uses. I have discovered, however, that by providing a suitable stiffening configuration I am able to construct from sheet metal of uniform thickness blade-supporting members which answer all the exacting requirements of the razor industry.
As illustrating one useful application of my invention, I have herein shown a safety razor having a sheet metal guard member which is stiffened by the walls of an elongated depression moulded or otherwise formed in the body of the blank and serving to stiffen it in a marked degree against being deformed either longitudinally or transversely. As preferred and as herein shown the depression is made diamond-shaped and utilized for the additional function of receiving the blade-locating rib of the cap. The walls of the recess, moreover, are arranged to converge and are slotted at their end portions to engage the ends of the rib of the cap and so position the cap accurately in the razor assembly.
As a further and optional feature of the invention I propose to supply a face-engaging portion of the guard with transverse grooves or scorings tending to oppose longitudinal slipping of the razor on the face of the user, so obviating or largely reducing a movement of the razor which is likely to result in cutting the user.
These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawing in which—
In the safety razor selected to illustrate my invention the cap
The guard member
The guard member
The thin flexible sheet steel blade
It will be understood that the cap and guard members determine by their edges the edge exposure of the blade as suggested in
While I have shown my invention as embodied in the guard member, it would be within the scope of the invention to construct the cap of sheet metal and stiffen it by a walled depression within the terms of the appended claims.
Having thus disclosed my invention and described in detail a preferred embodiment thereof I claim as new and desire to secure by Letters Patent:
1. A safety razor comprising cap and guard members, one having a projecting blade-locating rib and the other comprising a sheet metal body having a depression in its blade-engaging face defined by relatively thin, sheet metal side walls which stiffen the guard against bending and converge toward both ends of the guard into engagement with the rib of the other member for accurately locating the same.
2. A safety razor comprising a cap having a projecting blade-locating rib, and a sheet metal guard member having an elongated shallow dome moulded therein and providing a recess for receiving the rib of the cap with clearance throughout the major portion of its length and surrounding sheet metal walls which stiffen the guard member against bending and converge substantially into engagement with the ends of the rib of the cap.
3. A safety razor comprising a cap having a concave blade-engaging face with a projecting rib therein, and a sheet metal guard having a convex blade-engaging face in which is moulded a diamond-shaped depression having guard stiffening walls of sheet metal which engage said rib at its ends to locate the cap and diverge toward the center of the guard into spaced relation with respect to said rib.
4. A safety razor having, in combination, a ribbed cap, and a sheet metal guard having a depression therein formed by endwise converging walls of sheet metal, the vertices of said walls being slotted to provide rib-engaging stops for locating the cap by fitting the ends of the rib while the body of the depression receives the intermediate portion of the rib with clearance.
5. In a safety razor, a ribbed cap and a guard of pressed sheet metal having a transversely convex blade-shaping face, downturned marginal flanges, a central perforation, and a diamond-shaped rib-receiving depression sunk symmetrically in its major axis with its widest part enclosing said depression and its ends provided with slots extending through the walls of the depression and into the surrounding metal of the guard, for locating the cap by engaging the ends of its rib.
Samuel C. Stampleman.