Re: When/where did worm-type hose clamps first appear?
Posted by BH On 2012/3/10 21:08:04
Your "modern worm style hose clamp" might date back to a patent issued in London for 1921 for a "Jubilee clip". The worm-gear style is commonly referred to as an aviation type clamp. I don't know that this style was ever used in OE production for any US vehicle, but has been sold in the aftermarket for automotive repair, from suppliers like Ideal and Murray, for decades.
The screw-adjusting type band clamp that I've seen on Packards in the course of regular production uses a nut and bolt to pull the two "ends" of a band together (show in profile in the attached image, below). The tensioning concept is closer to that used on the double-wire hose clamp, though the flat band likely spreads the force more evenly - provided it's installed correctly.
The Utility section (Gr. 50.675) included in some of the factory parts books shows P/N 230085 for a screw-adjusting clamp sized for the typical radiator hose. This particular number tracks back, continuously, through 10th Series; 120-115C used same type, but of a smaller diameter.
Without support of factory blueprint or equivalent, I suppose it's debatable whether this screw-adjusting clamp was OE for specific production. However, IMHO, it ought to be considered authentic for judging WRT those applications shown in the factory part books.
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The screw-adjusting type band clamp that I've seen on Packards in the course of regular production uses a nut and bolt to pull the two "ends" of a band together (show in profile in the attached image, below). The tensioning concept is closer to that used on the double-wire hose clamp, though the flat band likely spreads the force more evenly - provided it's installed correctly.
The Utility section (Gr. 50.675) included in some of the factory parts books shows P/N 230085 for a screw-adjusting clamp sized for the typical radiator hose. This particular number tracks back, continuously, through 10th Series; 120-115C used same type, but of a smaller diameter.
Without support of factory blueprint or equivalent, I suppose it's debatable whether this screw-adjusting clamp was OE for specific production. However, IMHO, it ought to be considered authentic for judging WRT those applications shown in the factory part books.
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