Thread: Suredge

Originally Posted by Voidmonster

Great job!

I've only got one razor with that grind -- a Cattaraugus, also with a mid-blade etch (mostly faded, for a hardware store).

Attachment 188300Attachment 188301Attachment 188302Attachment 188303

(Uh oh, I've posted two post 1900 razors neither of which were made in Sheffield! The following razor picture is purely to preserve my reputation)

Attachment 188307

now i like that one too

Originally Posted by sharptonn

Thanks, Glen. I agree on the grind. I have a Cattaraugus with the same grind. For some reason, they shave differently than anything else. In a good way . I think George Korn Patent ?

That is what we found, I am not 100% sure that is the whole story worldwide, but it is in the US at least..
I have seen a similar double grind on an older Sheffield, and a couple of German razors too.. I would have to search way back to find the threads..

One of the German razors here and the link to the Patent TY Oz
http://straightrazorpalace.com/custo...al-scales.html

One fact I am sure of I do like the way they shave hehehe

Nice job on this razor! I have those scales on a Shure edge. Its a great shaver as are almost all my Robesons

I have an American Double Hollow by George Korn (a fantastic shaver). Interestingly it has the two notches ground in the spine like Void's Cataragus but is double stabilized. The grind is very similar but the second grind is hollow (the primary stabilizer stands a bit proud until it reaches the edge). I am not sure if that makes this Robeson grind different or just within the tolerance of the grinder. I have a decent selection of Robesons (6 in shaving shape) 8-9- maybe more total...I can't remember! Tnere is a double hollow etched "Pilot." I have been searching for a "New Science" but haven't found one of the quality that I want.

Originally Posted by gssixgun

That is what we found, I am not 100% sure that is the whole story worldwide, but it is in the US at least..
I have seen a similar double grind on an older Sheffield, and a couple of German razors too.. I would have to search way back to find the threads..

One of the German razors here and the link to the Patent TY Oz http://straightrazorpalace.com/custo...al-scales.html

One fact I am sure of I do like the way they shave hehehe

It surely does have that feature, but it seems the American versions such a Zak's are very pronounced. We all know Korn made razors for lots of makers and supposedly held the patent. Makes me wonder!
Here is my Cattaraugus from an old thread:

Glen's post made a bell go off. I have a Lion with this grind. Was in the exit pile and just got moved back to keeper section.



Not a great pic sorry but I am busy with something else at the moment. Just wanted to be part of the club :<0)

Very nice work on this razor once again Tom, love the American double hollow grind, well thats the name George Korn gave to it on his patent in 1902.



SPECIFICATION forming part of Letters Patent N0. 693,524, dated February 18, 1902.

Application filed June 27, 1901. Serial No. 66,196. (ModeL) To all whom it may concern.-

Be it known that I, GEORGE W. KORN, a citizen of the United States, residing at Little Valley, Cattaraugus county, in the State of New York, have invented certain new and useful Improvements in Razors, of which the following is a specification.

The object of myinvention is to so construct a razor that it will have concave faces along the cutting edge and yet be firm in action. Heretofore the razors mostly in use were of two kinds, the one known as the English hollow ground, which has concave faces that extend from the cutting edge to the very back of the blade. These have practically ceased to retain t'heirhold upon the market, because of the vibratory character of the edge, since the extended concavity made the cutting edge vibratory to such an extent as to render the instrument itself objectionable in use. The cutting edge appears to lose its straight line and to assume apparently an undulating form in action whenever it meets with an obstruction. The other kind of razor largely in use is known as the Hamburg concave, which had the back portion of the face concave and the edge portion substantially convex and which, though producing a satisfactory cutting edge when new, was subject to the serious objection that after short use it could no longer be honed, owing to the fact that the ridge of the convexed portion would stand outside of the line drawn from the extreme back to the extreme cutting edge, thereby preventing the edge from touching the hone.

Now my invention seeks to utilize the principle of concavity at the cutting edge, together with the principle of a thickening of the blade between the cutting edge and the back; and it consists in a blade which, startingfrom the back,has a concave portion which terminates in a ridge, from which ridge toward the cutting edge another concave portion is formed, the ridge itself being within a line drawn from the back to the cutting edge, so that honing is always permitted.

The superiority of this construction resides in the fact that the concavity of the cutting edge, with all the advantages flowing there-' from, is preserved, while the ridge, which is but a short distance from the cutting edge,- keeps it from becoming vibratory and stiffens the entire tool.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a face view of a razor embodying my invention, and Fig. 2 is a cross-sec tion of the blade on line 2 2 of Fig. l.

a is the back of the blade, the thickness of which at that point is about three-tenths of the breadth of the blade. Adjacent to the back are concave surfaces 1), which lead to a rib o, and from this forward to the edge (1 of the blade the surface of the razor is again concave, as shown at e. The rib c is preferably located at about one-third of the dis tance between the back a and the edge d; The rib is of such a thickness that it does not quite extend to lines drawn from the edge (1 to the outer portions of the back athat is, the rib is within said linesf, as indicated in Fig. 2.

The provision of the rib 0 between the two concave portions 1) and e stifiens the razorblade, and thus gives the cutting edge the necessary strength to prevent its vibration. At the same time as the said rib is within the linesf, connecting the edge (1 with the back a, the rib does not interfere with the honing of the razor. The cutting edge is practically hollow ground, since the portion between the rib c and the cutting edge dis-concaved, and thus all the advantages of the hollow-ground razor are preserved, while the drawbacks of the ordinary construction are avoided.

WhatI claim,and desire to secure by LetterslPatent, is

A razor provided with a longitudinal rib extending between its back and the cutting edge and near-er to the cutting edge than to the back, the razor having concave surfaces which begin at the back and extend forward to the said rib, and a second set of concave surfaces which extend from the rib forwardly to the cutting edge, the rib being within lines drawn from the edge of the blade to the outer portions of the back.

GEORGE W. KORN.

Witnesses:

HENRY M. TURK, JoI-IN LorKA.

Well-done, Martin!

Originally Posted by sharptonn

We all know Korn made razors for lots of makers and supposedly held the patent. Makes me wonder!
Here is my Cattaraugus from an old thread:

George Korn and J. B. F. Champlin were business partners, Korn was the buyer for Cattaraugus for all imported goods from Germany where he was born and also he owned a big part of the shares of Cattaraugus.

So its no surprise to see the same "American Double Hollow" on the Cat!

I think its highly possible that they were made in the same building, highly probable.

Tom,

Nice work on those scales and the blade

I've got a German razor with a very similar grind (Glen's handled it for putting replacement scales on) I can't tell you much about it as the writing is in German, there's no date and the seller or someone else had buffed the blade and I can't see what it once said.

I don't have a picture and I'm too tired to set up the light box but I'll try to get a decent picture. If not tonight hopefully tomorrow. Working retail grocery during the holidays is rough on this old man!

Ok, for what they are worth here's some pics. I'm no Ansel Adams but I think you can see the grind. Once I looked at the pictures I could see part of the etching so after careful viewing I 'THINK' it Says:

Gisenhart or Risenhart on the blade, it's in an oval and there are some other marks at the toe and heel in a straight line and centered with the oval