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Owners no more...
Thanks Dawn and Patrick! -
Unless you are dealing with the Patent Office: http://www.patentstorm.us/patents/5860745/description.html
On Wed, Dec 30, 2009 at 6:28 PM, Patrick Walters < ([email][/email])> wrote:
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Regards,
John Stevenson
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Then I'm going back with what I've known it as for the last 50 years, cutlass bearing. Ahahahahahahaha!
Bob
On Wed, Dec 30, 2009 at 10:23 PM, John Stevenson < ([email][/email])> wrote:
Unless you are dealing with the Patent Office: http://www.patentstorm.us/patents/5860745/description.html
On Wed, Dec 30, 2009 at 6:28 PM, Patrick Walters < ([email][/email])> wrote:
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John Stevenson
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Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
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As far as I can tell by doing a web-search, they were originally called cutless bearings by the inventor since they were self-lubricating and didn’t cut the shaft. Previously shaft bearings were made of Lignum Vitae, a kind of wood. The new bearings were originally manufactured by Goodyear (I think) using the cutless trade-name. They were later manufactured by another company using a cutlass logo and became popularly known as cutlass bearings much like my grandparents called refrigerators frigidairs. There appear to be more references to cutlass that cutless so I think its the more popular spelling. My own perference is to call them cutless because it refers to the device with its original name and not a brand-name. I think either spelling is perfectly acceptable however.
“In the beginning inboard propeller shaft bushings were wood, machined from the rock hard tropical Lignum Vitae tree. That is until the 1920s when a Californian mining engineer improvised a bearing using a chunk of common rubber steam hose pressed inside a sleeve. The modern day Cutless bearing replete with flutes and naval bronze tubing was born. Cutless bearing technology advanced during the WW II battle for the Coral Sea when reverberations from explosions in the water hardened the rubber in Cutless bearings. Battleship propeller shafts locked up solid. Rigid rubber was soon replaced by resilient nitrile rubber.”
Rich
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Was the inventor's name Cutless?
On Thu, Dec 31, 2009 at 9:59 AM, Rich Carter < ([email][/email])> wrote:
Quote:As far as I can tell by doing a web-search, they were originally called cutless bearings by the inventor since they were self-lubricating and didn't cut the shaft. Previously shaft bearings were made of Lignum Vitae, a kind of wood. The new bearings were originally manufactured by Goodyear (I think) using the cutless trade-name. They were later manufactured by another company using a cutlass logo and became popularly known as cutlass bearings much like my grandparents called refrigerators frigidairs. There appear to be more references to cutlass that cutless so I think its the more popular spelling. My own perference is to call them cutless because it refers to the device with its original name and not a brand-name. I think either spelling is perfectly acceptable however.
“In the beginning inboard propeller shaft bushings were wood, machined from the rock hard tropical Lignum Vitae tree. That is until the 1920s when a Californian mining engineer improvised a bearing using a chunk of common rubber steam hose pressed inside a sleeve. The modern day Cutless bearing replete with flutes and naval bronze tubing was born. Cutless bearing technology advanced during the WW II battle for the Coral Sea when reverberations from explosions in the water hardened the rubber in Cutless bearings. Battleship propeller shafts locked up solid. Rigid rubber was soon replaced by resilient nitrile rubber.”
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Navy ships still use lignum vitae for the strut and stuffing boxes. The stuffing boxes are pressure lubricated, though.
The wood lasts far longer than rubber. Very often, a ship will go it's full lifetime without changing the bearing surface.
Bob
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Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
Follow me at: http://www.tinyurl.com/WhereIsBobFinePost generated from Pearson424 Forum using Mail2Forum
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On 12/31/2009 7:59 AM, Rich Carter wrote:
… Previously shaft bearings were made of Lignum Vitae, a kind of wood. …
Lignum Vitae, also known as “iron wood” is one of two woods that naturally don’t float. The other one is Natalie Wood. ba dum bump…
Pete
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Bah, humbug! Just because a few manufacturers don’t know how to spell…
🙂
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Silver Heels, P-424 #17
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