[CW] Vibroplex Variable Main Spring

[Dennis Berry]

Actually those parts of the drawing are all shown on page 2 of the patent. They are cross sections of three different areas.  The patent shows it with some sort of a gear driven system (Fig 9) which is a cross cut of Fig 8, described in lines 25-40 (roughly) of the last page. 
(My old shop class teacher would be proud. )

Dennis

> On Mar 10, 2020, at 8:34 PM, D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
> 
> 
> And I can never find out where in the patent drawings he shows the placement of Figures 8, 9 and 10. The attachment places aren't shown. There missing. But that's typical of patent drawings, they really don't show the patented device clearly! They keep it a secret.
> 
> His device was more complicated at first with a gear that adjusted the mainspring. It was simplified with a notch and two machine screws on the Presentation model.
> 
> 73
> DR
> 
>> On Tue, Mar 10, 2020, 19:23 Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
>>      I found the patent again. Turns out I already had it. This 
>> shows the La Hiff variable main spring on a Lightening Bug type 
>> key. It is USP 2187351
>> at:
>> https://patentimages.storage.googleapis.com/31/d1/c8/b34c68f33be536/US2187351.pdf
>> 
>> -- 
>> Richard Knoppow
>> 1oldlens1 at ix.netcom.com
>> WB6KBL
>> 
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