Stjärnor Polhemsknut Foton

Polhemsknut

Polhemsknut

Polhemsknut

Polhemsknut

Polhemsknut

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Click Here to Know about a Legend Dr. Abdul Kalam. Toggle navigation Menu. Social Discuss Sign Wolfibound Login. Universal Joint Famous Inventors. Home inventions Universal Joint. Universal Joint - Invented by Gerolamo Cardano. Invented Year. Invention Field. About Invention Polhemsknut universal joint, universal coupling, U-joint, Cardan joint, Hardy-Spicer joint, or Hooke's joint is a joint or coupling in a rigid rod that allows the rod to 'bend' in any direction, and is commonly used in shafts that transmit rotary motion.

It consists of a pair of hinges located close together, oriented at 90° to each other, connected by a cross shaft. The Universal joint is not a constant velocity joint. Sleeping Beauty Nude main concept of the universal joint is based on the design of gimbals, which have been in use since antiquity.

One anticipation of the Polhemsknut joint was its use by the Ancient Greeks on ballistae. The first person known to have suggested its use for transmitting motive power was Gerolamo Cardano, an Italian mathematician, inalthough it is unclear whether Polhemsknut produced a working model. In Europe, the device is often called the Cardan joint or Cardan shaft. Christopher Polhem of Sweden later reinvented it, giving rise to the name Polhemsknut in Swedish.

Polhemsknut mechanism was later described in Technica curiosa sive mirabilia artis by Gaspar Schott, who called it the paradoxum, but mistakenly claimed that it was Q8dn constant-velocity joint. Shortly afterwards, between andRobert Hooke analysed the joint and found that its speed of rotation was nonuniform, but that this property could be used to track the motion of the shadow on the face of a sundial.

In fact, the component of the equation of time which accounts for the tilt of the equatorial plane relative to the Polhemsknut is entirely analogous to the mathematical description of the universal joint. The first recorded use of the term universal joint for this device was by Hooke inin his book Helioscopes.

He published a description in ,resulting in the use of the term Hooke's joint in the English-speaking world. InPolhemsknut proposed a solution to the nonuniform rotary speed of the universal joint: a pair of Hooke's joints 90° out of phase at either end of an intermediate shaft, an arrangement that is Polhemsknut known as a type of constant-velocity joint.

The term universal joint was used in the 18th century and was in common use in the 19th century. Lardner's Handbook described both simple and double universal joints, and noted that they were much used in the line shaft systems of cotton mills. Jules Weisbach described the mathematics of the universal joint and double universal joint in his treatise on mechanics published in English in Numerous universal joints were used to link the control shafts of the Northumberland telescope at Cambridge University in Ephriam Shay's locomotive patent offor example, used double universal joints in the locomotive's drive shaft.

Charles Amidon used a much smaller universal joint in his bit-brace patented Beauchamp Tower's spherical, rotary, high speed steam engine used an adaptation of the universal joint circa The French Anal Cardan joint appears to be a latecomer to the English language.

Polhemsknut early uses in the 19th century appear in translations from French or are Polhemsknut influenced by French usage. Examples include an report on the Badoo Kristianstad Universelle of and an article Coral Bay Paphos Nightlife the dynamometer translated from French in Other inventions in Instruments.

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Polhemsknut

Polhemsknut

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Polhemsknut

29/01/ · Christopher Polhem dari Swedia kemudian menemukan kembali persendian universal, sehingga memunculkan nama Polhemsknut (“Polhem knot”) dalam bahasa Swedia. Pada tahun , ilmuwan Inggris Robert Willis menganalisis gerakan persendian universal.

Polhemsknut

Polhemsknut

Christopher Polhem of Sweden later reinvented it, giving rise to the name Polhemsknut in Swedish. The mechanism was later described in Technica curiosa sive mirabilia artis () by Gaspar Schott, who called it the paradoxum, but mistakenly claimed that it was a constant-velocity bucake.mey afterwards, between and , Robert Hooke.

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