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PICList Thread
'(OT) Sping Loaded Battery Contacts Anyone?'
1998\08\31@130942 by Lewis H. Cobb

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Ok, I know this is way off topic on first glance, but the project involves
a PIC in a hand-held instrument so I figured it kind-of applies here.

I'm designing a small hand-held instrument that is going to be
re-chargable.  Rather than spending a bzillion dollars on an industrial
design I have found a suitable off the shelf enclosure that the
manufacturer will modify at a small cost.  There will be two "contact" pads
on the unit that are about .2" (5mm) diameter.  I have been looking around
for spring loaded pins that I can use to design into the mating
charger-holder unit but all I can find are the test point probes that are
used in the bed-of-nails testing jigs that are used in production and these
are far too small.

Years ago I remember seeing exactly what I am looking for in the holder of
a cordless phone.  The pins were stainless and 0.250" diameter, tapering to
a reasonable point, and sping loaded.  That phone can be found nowhere at
this point and web searches have been fruitless.

Can anyone pass along any suggestions on where I might go to find a
manufacturer of these things or something similar?  I have already checked
out the IDI (interconection devices) web site and they have battery
contacts but again, they are more suited to smaller battery packs and not
really what I am looking for.

Thanks in advance for any help people can provide.

Lewis
spam_OUTcobbTakeThisOuTspamzeus.ee.unb.ca

1998\08\31@143216 by Mark Willis

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I just bought the girlfriend a couple Pilot "Dr. Grip" pens at Costco
for her to write with (her hands don't close very well.)  These have a
cap (the button you push on to pop the point in & out) that looks JUST
almost like what you're describing to me - This could be chromed brass
or other metal instead of stainless steel, but I think that it, + 2
springs etc. would do the job.

 The top button is 1/4" diameter, sort of a rounded top but with a flat
center, 3/32" diameter, probably at least 1" long;  I imagine it's a
"top hat" shape;  I can't disassemble this pen without wrecking it, and
risking destruction of my self from Robin, but the pens were $6 or so
for a pair.  And you can probably sell me the refills as Robin will use
'em eventually <G>

 There's some sort of brass fitting inside the hand grip that may be
good to base the electrical connection on, even?  If you hit this cap at
a slight angle, you'd have a small 'wiping' contact area & that should
work...

 Also, The local thrift stores, swap meets, flea markets, etc. would be
good places to look for that old cordless.  Or another similar beastie.

 Mark, .....mwillisKILLspamspam@spam@nwlink.com

Lewis H. Cobb wrote:
{Quote hidden}

1998\08\31@154856 by Joe Little

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    I saw them once in an EMI shielding catalog.  They were spaced about
every
    four inches around the perimeter of a door so they must have been
    inexpensive.

1998\08\31@163933 by wwl

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On Mon, 31 Aug 1998 14:07:00 -0300, you wrote:

>Ok, I know this is way off topic on first glance, but the project involves
>a PIC in a hand-held instrument so I figured it kind-of applies here.
>
>I'm designing a small hand-held instrument that is going to be
>re-chargable.  Rather than spending a bzillion dollars on an industrial
>design I have found a suitable off the shelf enclosure that the
>manufacturer will modify at a small cost.  There will be two "contact" pads
>on the unit that are about .2" (5mm) diameter.  I have been looking around
>for spring loaded pins that I can use to design into the mating
>charger-holder unit but all I can find are the test point probes that are
>used in the bed-of-nails testing jigs that are used in production and these
>are far too small.
>
Some manufacturers of test-point type probes also make larger stuff
for this type of application - Coda Systems in the UK do a huge range
of this sort of stuff - I'm sure there are many others.
    ____                                                           ____
  _/ L_/  Mike Harrison / White Wing Logic / .....wwlKILLspamspam.....netcomuk.co.uk  _/ L_/
_/ W_/  Hardware & Software design / PCB Design / Consultancy  _/ W_/
/_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/

1998\08\31@201831 by David Instone

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       -----Original Message-----
       From:   Mike Harrison [SMTP:EraseMEwwlspam_OUTspamTakeThisOuTNETCOMUK.CO.UK]
       Sent:   Tuesday, 1 September 1998 06:41 AM
       To:     PICLISTspamspam_OUTMITVMA.MIT.EDU
       Subject:        Re: (OT) Sping Loaded Battery Contacts Anyone?

       On Mon, 31 Aug 1998 14:07:00 -0300, you wrote:

       >Ok, I know this is way off topic on first glance, but the project
involves
       >a PIC in a hand-held instrument so I figured it kind-of applies
here.
       >
       >I'm designing a small hand-held instrument that is going to be
       >re-chargable.  Rather than spending a bzillion dollars on an
industrial
       >design I have found a suitable off the shelf enclosure that the
       >manufacturer will modify at a small cost.  There will be two
"contact" pads
       >on the unit that are about .2" (5mm) diameter.  I have been looking
around
       >for spring loaded pins that I can use to design into the mating
       >charger-holder unit but all I can find are the test point probes
that are
       >used in the bed-of-nails testing jigs that are used in production
and these
       >are far too small.
       >
       Some manufacturers of test-point type probes also make larger stuff
       for this type of application - Coda Systems in the UK do a huge
range
       of this sort of stuff - I'm sure there are many others.
            ____
____
          _/ L_/  Mike Harrison / White Wing Logic / @spam@wwlKILLspamspamnetcomuk.co.uk  _/
L_/
        _/ W_/  Hardware & Software design / PCB Design / Consultancy  _/
W_/
       /_W_/  Industrial / Computer Peripherals / Hazardous Area      /_W_/

       I had need of something like this once in the past and found my
local spring manufacturer to have or be able to make almost anything I
needed very cheaply
       There should be one in your local phone book. Good luck

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