[CW] Vibroplex Variable Main Spring

[Grant Youngman]

It appears to me that he is showing options for adjusting the length of the mainspring.  In the first case (those shown on the key) the spring is held by two retaining screws (25), and you loosen those screws to slide the spring and adjust it’s length.  Similar to the early VPlex Presentations.  In the case of figures 8-10 he is showing an alternative method of adjusting the mainspring length by means of a gear and a single retaining screw.

Grant NQ5T

> On Mar 10, 2020, at 10:26 PM, D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:
> 
> Hi Dennis,
> 
> The placement of those parts isn't shown. The method of the gear controlling the length of the mainspring is shown, but it isn't shown on the key, unless I'm blind, which I'm pretty blind these days, but it's not shown where it goes.
> 
> Right?
> 
> 73
> 
> DR
> 
> On Tue, Mar 10, 2020, 21:31 Dennis Berry <dennisberry at att.net> wrote:
> 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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