IS 7370 – Razors, safety

As I mentioned last week, the internet is a strange place. But also a fun place, if you like nerding out from time to time. The Indian Standard 7371, which I talked about last week, does of course have a companion standard. IS 7370 covers razors, safety – just as 7371 covers blades. And IS 7370 have some rather neat and potentially useful information as well.

Useful if you plan to design or manufacture your own safety razor, that is. Neat if you like this sort of things – which I do.

IS 7370

IS 7371 – Stainless steel safety razor blades

The internet is… interesting. There is so much information out there that it is almost impossible to find it. But sometimes I find something which isn’t what I look for, but which nevertheless grabs my attention. Like IS 7371.

On the surface, just a dry government publication defining the acceptable standards for stainless steel safety razor blades. But once you start looking through it, you realize that it is a wealth of very specific information that can be interesting for anyone who are tying with the idea of making a safety razor. Or just happen to have a general thirst for esoteric knowledge.

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Self-watering brush

The self-soaping shaving brush is not a new idea. We’ve looked at various ones from 1849 and onward up until the 1980s. But what we have today is not not a self-soaping brush – it is a self-watering brush. Although you could likely use it as a self-soaping one too, with the right liquid soap.

Most – if not all – inventions try to solve some form of problem. Some are successful. Some solve problems we no longer have. And sometimes the problem is imaginary. As to which category James B Fischbach’s self-watering brush falls in… well, let’s look at his patent.

The object of my invention is to construct a brush used for shaving purposes, and to effect certain improvements of this character whereby simple and efficient means shall be provided for forcing water into the brush and for readily controlling the flow.

It is also constructed to fill itself when said brush is placed in water, and at the same time when the brush is being used it supplies the bristles or hair of said brush with said water.

From US patent 583,702
Patent drawing from US patent 583,702

The secret is on the inside of the otherwise normal looking brush. A rubber bulb with an elongated teat sat inside the hollow handle. The tip of the teat nestles between the hair of the knot. When a operator wants to shave, he places the brush in water as normal. And then he pushes on the bulb, expelling the air. This, in turn, makes the bulb suck water through the teat. Then, while he is lathering normally, the operator can push the bulb to squeeze some of the water into the knot to hydrate it.

Yes, I’m not sure either as to what benefit this would have. A easy way to add water to lather, but I can think of other and simpler ways to achieve it.

I think we can add the patent for the self-watering brush to the list of patents that solves imaginary problems.

As always, you can read the full patent at Google Patents.

A 1870 improvement in shaving-mugs.

An interesting thing about old patents – especially really old ones – is that the inventions looks so… obvious today. Like this 1870 patent for an improvement in shaving-mugs. A hundred and fifty three year later is just a shaving mug. Back in 1870 Frank B Clock’s idea was a non-obvious improvement to the state of art. Time marches on, I guess – for better or worse.

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Sheet metal shaving-brush holder

The problem of how to store our brushes have been with us a long time. Store it bristles up, and the handle gets wet. Store it bristles down, and the bristles may deform. Luckily Samuel T Varian have come up with a simple shaving-brush holder that can easily be clipped onto your shaving mug. Or anywhere else, for that matter.

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A rather spiky shaving mug

There are fewer patents for shaving mugs than there are for razors. Even so, some basic ideas gets recycled. A few years ago I snarked on a 1875 patent for a shaving mug where you could screw your soap down to keep it from falling out or flipping around. Just a few years later Mr Joseph Maria Blasi solved the same problem with a rather more spiky shaving mug.

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Shaving soap holder

Have you ever gotten fed up with how the cake of soap sits at the bottom of the shaving cup, being wet and gross and all that stuff? Me neither, but in our defence most of the people treating traditional wetshaving as a hobby have more than one soap. And most of us don’t keep it in a single shaving mug. But way back then, when a single cake of soap kept in a mug was the order of the day? I can definitely see the appeal of John Richardson’s 1892 patent for a shaving soap holder.

And it is a nice, simple idea too. But before we look closer, let us see what John wanted to achieve:

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Birthday week e-book sale!

My birthday is coming up. And it is a round number too. So to celebrate, I’m offering digital copies of my first book for free!

It is a meandering look at the history of shaving, as seen through patents from the last century and a half. Somewhat serious, somewhat humorous, with quite a bit of snark. The book explores a wide range of ideas ranging from electrically heated razors to plug into the light fixtures, magnetic pseudoscience, and of course the ever present vibrating razors. And you’ll find a few sensible razors that were the right idea at the wrong time in there too.

What I appreciate the most is the author’s commentary. He points out the most interesting aspects of the patent in a couple of short paragraphs. This isn’t always obvious from the patent drawing itself, so the author has done the work of reading through the patent and describing the vision and features of the invention.

Dennis, review on Amazon

You can get it on Amazon

So from Monday 3rd July and for five days you can grab some free summer reading!

You can get it on Amazon

Design for a shaving-mug

Design patents are a different breed. A utility patent, which most of the patents I write about are, protects a new new or improved – and useful – product, process, or machine. A design patent, on the other hand, covers any any new, original and ornamental design for an article of manufacture. Designs like Herman Griebel’s design for a shaving-mug, which he got a 3½ years design patent for in November of 1882.

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Traveller’s shaving-mug

We can’t shave at home all the time. As I recently lived through, sometimes we have to shave elsewhere. And one thing I did miss was a traveller’s shaving-mug – like the one Henry E Biggins filed a patent for on 1911. It looks very neat and handy, even a hundred and twelve years later.

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