A Hitch in a Hitchpin/Del

[Mike Bratcher]

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Are these the same type hitch pins used briefly by Baldwin in their =
Classic series grands?  I needed to twist a bass string on one of these =
a while back, but was unable to get the string off after the round loop =
of the bass string had elongated to the point it wasn't possible to =
remove with out damaging the string.

Mike Bratcher
  ----- Original Message -----=20
  From: Delwin D Fandrich=20
  To: Pianotech=20
  Sent: Thursday, December 18, 2003 1:33 PM
  Subject: Re: A Hitch in a Hitchpin/Del



  ----- Original Message -----=20
  From: "Joseph Garrett" <joegarrett@earthlink.net>
  To: <pianotech@ptg.org>
  Sent: December 17, 2003 10:18 PM
  Subject: Re: A Hitch in a Hitchpin/Del


  > Del said: "Ed,
  > > I had the same dilemma with a Charles Walter Grand, which has =
"Spring
  > Pins"
  > > for hitch pins.
  >=20
  > No it doesn't. It has groove pins.
  >=20
  > Del
  >=20
  >=20
  > Del,
  > I beg to differ with you. The "groove(d) pins" are known a spring =
pins.
  > Reason being is that their primary use is to connect a spring to a =
fixed
  > point. I was not referring to the spring steel pins, as in Baldwins! =
I
  > believe if you were to type in "spring pin" in your search engine, =
you would
  > come up with the same "pin" that you designed into the Walter. Sorry =
for the
  > confusion folks. This must be my day for being =
misread/misunderstood. Damn!
  > Oh well, Happy Holidays anyway!<G>
  > Joe Garrett, RPT, (Oregon)
  > Captain, Tool Police
  > Squares Are I


  Hi Joe,

  And I beg to differ with you...and, yes, I am well aware of their use. =
After all, I did introduce them to the piano world.=20

  The pins specified are either a 'Groov-Pin Type 67' groove pin or a =
'Driv-Lok Type G' groove pin:=20



  The terms "groove pin" and/or "spring pin" refers to how they are =
fixed to the hole not to their intended use. For example, a 7/32" (5.5 =
mm) groove pin has a body size of just under 7/32" and easily fits into =
a size-on-size 7/32" hole. It is fixed by the friction fit of the three =
staked grooves extending approximately 1/2 of its length. See the =
illustration below:

  The staked groove before insertion:




  The deformed groove after insertion:




  There are a variety of groove pins standard to industry. The Type =
67/Type G is just one of them and it is the only one with an annular =
groove machined in one end. True, this type of pin is often used as a =
spring anchor, but it is also used as a pulley axle, a pivot pin, etc. =
The annular groove can be (and is) machined to a variety of =
configurations depending on need.




  A Google search for "spring pin" turns up a variety of resources, most =
of them referring to spring pins as "roll pins" or "split pins" or some =
such. The "spring pin" (see the diagram below) is made of 'spring' steel =
to a diameter slightly larger than the hole it is to be driven into and =
is fixed to the hole by spring action:



  Regards,

  Del
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