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Re: [PSUBS-MAILIST] rotary ADS joint question
Carsten,
You could add several legs to the Euronaut & save on batteries.
If you had enough this might be an easy launch method.
Alan
----- Original Message -----
From: <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Sunday, October 31, 2010 9:16 PM
Subject: Re: [PSUBS-MAILIST] rotary ADS joint question
Hi Phil,
Emile and I just update the next month the KSS Eurosub with a new bigger diameter frontdome we just develop together with Reinhard
from the Nemo project. It 1 meter in diamter and 2,4 inch strong acrylic. Not cast and not blown - but hotmould of a polished
steel ball hydraulic oven press.
But there was also a request by the owner may to ads 1-2 manipulators. I just read this track and comes back to an old idea of
Wilhelm Bauer. Can we add one or two Hardsuit or Newsuit arms to the sub so that the arms operator in prone position can slid his
arms into it from inside the pressure hull? Will this work? This solution seems for me on the first view easier to handle and
control than a electric or electrohydraulic drivens manipulators.
Vbr Carsten
"Phil Nuytten" <phil@philnuytten.com> schrieb:
Hi, Sean:
I can understand your confusion since the language in this particular patent is not as clear as it should be . . the degree of
axial movement cited - a couple of degrees - is the allowable tilt of the oil reservoir piston without binding. It has nothing
to do with the 'anti-tilt' bearing described in Humphrey's subsequent patent CA 2485908. The anti-tilt mechanism was developed
by my company, (Hard Suits Inc.) around the same time as my CA 1209632 patent - that patent describes the basic principle of
the rotary joint but purposely omitted the 'anti-tilt' feature and an addition feature which was in use at that time called the
'fail-safe' ring.
Although the Humprey patent appears to cover an entire rotary joint - it does not. The joint shown in the Humphrey is from my
original patent, but with the addition of the 'anti-tilt' feature and the 'fail-safe' ring. There are only two claims in the
Humphrey patent - the 'anti-tilt and the 'fail-safe' - the rest is prior art (my prior art). The short version is that my
original patent lapsed and the owners of the company (which was sold and re-named several times after it was acquired from me
and the other shareholders by a hostile take-over bid from a Texas company in 1996) very much wanted to continue to claim
'exclusive patented technology' even though that was no longer the case. Humphrey was my employee from 1985 to late 2001 and,
unbeknownst to me, cut a deal with Oceanworks (the most recent descendant of the original Hard Suits Inc.) to 'patent' these two
features in his name - but assigned to Oceanworks,(the two features that were not in my original patent.)
He is no longer in my employ.
The few degrees of axial movement possible in the oil make-up section amount to about 15 degrees in a five bearing limb -
significant - but nothing like the 90 degrees of normal movement - it is made possible by 'rocking' the piston when the
reservoir is partially depleted - not usually used and not claimed in either patent.
This pretty sketchy, but I can't go into further detail - except to say that I am currently the sole owner of Hard Suits Inc.
Original Message -----
From: Sean T. Stevenson
To: personal_submersibles@psubs.org
Sent: Saturday, October 30, 2010 12:31 PM
Subject: [PSUBS-MAILIST] rotary ADS joint question
Perhaps best directed at Phil, but posted to the list in case anyone is interested:
I was looking at some of the old ADS suit joint patents, and I noticed that the old Nuytten patent (CA 1296032) describes a
degree of freedom in axial alignment of 1.5 - 3 degrees per joint. By inspection, it appears that this is the result of the
movement of lower member 2 in this patent, although I could be mistaken. In any case, this permissible misalignment is touted
as a design advantage in the patent, although it is not clear whether this allowable flex is by design intent, or merely an
unintended consequence of the assembly. In the subsequent Humphrey patent (CA 2485908), this degree of freedom is characterized
as undesirable, and indeed the joint described in this patent specifically attempts to eliminate it and establish axial
rigidity, in an attempt to prevent any bending load on the joint from causing seal leakage. Intuitively this makes some sense,
although the Nuytten patent describes a cumulative flexing ability of 18 degrees over a seven-joint conduit; this is not
insignificant. I presume that this difference would need to be accommodated by adjusting the wedge angles and/or rotary limits
of each joint such that the necessary range of motion of the operator is not impacted. I'm not entirely sure what I'm asking
here - other than to get some idea of whether flex is an important design objective, or whether it is simply the result of
holding looser assembly tolerances than a design using fully rigid joints which relies upon joint rotation exclusively?
-Sean
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