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Permalink Reply by Gary Kennedy on August 17, 2010 at 17:41

only one that I know about is a two blade Hubertus you press the pen blade for the master blade to open Gary

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Permalink Reply by j d on August 18, 2010 at 15:43

Thanks Gary , I have seen the Hubertus on the web . The one I am referring to had only one large blade and it was a large jack knife , looked like a scout knife only it was about 7 1/2" open {no emblem or shield }had jigged bone handle . I wonder if it was an early Loveless , wish I could ask him . As I know he was born in an Ohio town not far from where I live I believe he does hunting type knives {not folders } but that is not to say he never did as there is much I don't know about this famous maker . Wonder if in his early days he might have stamped just R.W. U.S.A. on any of his projects . Maybe I'm just grasping at straws . I recently asked the guy who originally showed me the knife presumably it was his grandfather's and he thinks his son lost it {sigh } coulda been the holy grail of trick autos ! JD in Toledo

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Permalink Reply by j d on August 18, 2010 at 15:52

A second thought can anyone describe in detail just how the Hubertus pen release works ? Maybe I should just buy one but a drawing would really help out . Any engineers out there with a CAD program who are familiar with this knife ? Many thanks guys !
JD in Toledo

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In MemoriamPermalink Reply by D ale on January 30, 2011 at 11:04

@ jd ..

no 3D rendered solids avail .. purchasing a junked unit as a learning tool might be appropriate

 

An approach I’ve seen .. a coil spring exists that is attached to both a pt in the frame/bolster and a pt in the blade. This coil spring shares it’s cntr of rotation with the pivot pin of the blade.

 

The main blade is retained in the closed position by force of the back spring .. which is greater than that exerted by the coil spring.

 

The secondary blade (often a small pen) has an exaggerated kick .. such that when the secondary blade is forced “more” closed .. it’s exaggerated kick pushes the back spring up..

 

 .. relieving the pressure on the main blade .. the force of the coil spring now opens the main blade .. PRESTO .. as old George would say !!!  

 

j d said:

A second thought can anyone describe in detail just how the Hubertus pen release works ? Maybe I should just buy one but a drawing would really help out . Any engineers out there with a CAD program who are familiar with this knife ? Many thanks guys !
JD in Toledo

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In MemoriamPermalink Reply by D ale on January 30, 2011 at 11:07

And after the blade is pressed down .. into a more fully closed position .. is there presumably an internal hidden lock that is released .. and the blade will now fling open .. upon release ?????

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Permalink Reply by j d on January 30, 2011 at 12:33

Yep ! Getting warmer ! Let me see if I can persuade a friend of mine to scan my drawing and upload it so I can get it to you , might take me a week . the Hubertus is actually simpler in its design by every description the bidden button types and the bolster release require extra springs , or other moveable parts whereas this knife opened and locked in its closed position solely by this unique toggle or as I have reffered to it as a 'gatelatch' built into the backspring itself even under close examination it would be very hard to tell it was a switchblade except for the slight oval cut through the handle which is barely noticeable as its demensions were only large enough to permit a pin of approx 1/16'' in diameter to ride freely up and down through this oval slot approx. less than 1/4'' with the backspring as it would travel up and down upon depressing the blade thus it could not be opened unless you happened to squeeze the blade which required some pressure to open it , I strongly suspect that it must have been built shortly after 1958 because it has the thumbnotch which which would not be needed at all aside from making it look like an ordinary jackknife . I've looked at many patents from the 1800,s to the present and this design is perhaps an engenious embelishment of a conglomeration of a couple of designs whixh I have seen but they were only close and not right on the money thus I really can't substansiate them and regretfully they are buried amongst a volumous amount of material which I can't reference at this time . But as they say a picture is worth a thousand words so let me get that to ya . I appreciate you sticking with me on this . Your friend Joe [ JD ] in Toledo

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Permalink Reply by j d on March 16, 2015 at 21:40

HOLY GRAIL of switchblade knives ? Gentlemen forgive me for my absence please permit me to reawaken my former thread

After I inquired with Bill Deshivs I am convinced that the knife I once held in my hot little hands was one of a kind . Perhaps the maker of that knife was a machinist or a farmer or a regular 'Joe' like me who made it just for his own pleasure just as what I would like to do , It seems that it could only have been comprised of one or two additional parts built into the backspring , However my efforts to work this out on the drawing board have been yet so far in vain .Seems the guy could have made a fortune had he patented it . I suspect he might have died before he could or that since they banned autos on 1958 saw little practical purpose for doing so . But I endeavor to keep up my search and remain open to any and all who may have clues to this puzzle .

j d said:

Yep ! Getting warmer ! Let me see if I can persuade a friend of mine to scan my drawing and upload it so I can get it to you , might take me a week . the Hubertus is actually simpler in its design by every description the bidden button types and the bolster release require extra springs , or other moveable parts whereas this knife opened and locked in its closed position solely by this unique toggle or as I have reffered to it as a 'gatelatch' built into the backspring itself even under close examination it would be very hard to tell it was a switchblade except for the slight oval cut through the handle which is barely noticeable as its demensions were only large enough to permit a pin of approx 1/16'' in diameter to ride freely up and down through this oval slot approx. less than 1/4'' with the backspring as it would travel up and down upon depressing the blade thus it could not be opened unless you happened to squeeze the blade which required some pressure to open it , I strongly suspect that it must have been built shortly after 1958 because it has the thumbnotch which which would not be needed at all aside from making it look like an ordinary jackknife . I've looked at many patents from the 1800,s to the present and this design is perhaps an engenious embelishment of a conglomeration of a couple of designs whixh I have seen but they were only close and not right on the money thus I really can't substansiate them and regretfully they are buried amongst a volumous amount of material which I can't reference at this time . But as they say a picture is worth a thousand words so let me get that to ya . I appreciate you sticking with me on this . Your friend Joe [ JD ] in Toledo

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Permalink Reply by Jan Carter on March 17, 2015 at 20:49

Well JD it is very good to see you!

I would like to think he was a regular Joe that just happened to figure it out.  That means there is hope for the rest of us!!

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In MemoriamPermalink Reply by John McCain on March 19, 2015 at 13:13

I just posted a PDF of a 1952 Imperial Hammer Brand Jack-Master Catalog. If you look at pages 14 and 15, they had a  knife that opended and closed that way. They called it the Jack-Master Mystery knife-- 

http://iknifecollector.com/group/knifechicks2/forum/topics/imperial...

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In MemoriamPermalink Reply by John McCain on March 19, 2015 at 14:03

Here are the screenshots of the Jack-Master Mystery knife--

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FeaturedPermalink Reply by Jeremy B. Buchanan on March 19, 2015 at 20:07

I have an Imperial knife made in Ireland that has a hidden release. It was given to me by a friend (Bob Stewart), who is also a member here on iKC. It is a  pocket Knife with Faux Pearl Celluloid handles.

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Permalink Reply by j d on March 19, 2015 at 22:28

I'm familiar with this one , had a few of them when I was a kid . There is a horizontal pin inside that will move slightly to engage/disengage the hook in the blade . Still it is not a switchblade ! thanks for trying ! By the way Roy Rogers was a hell of a guy and to this day one of my heroes !

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