• WordNet 3.6
    • n tappet a lever that is moved in order to tap something else
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Webster's Revised Unabridged Dictionary
    • n Tappet (Mach) A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion.
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Century Dictionary and Cyclopedia
    • n tappet An early English spelling of tap.
    • n tappet Carpet; tapestry; a piece of tapestry.
    • n tappet In medieval armor, one of the series of flexible plates hooked to the skirts of the cuirass.
    • tappet To cover with tapestry.
    • n tappet In machinery, an arm, collar, lever, or cam attached to and projecting from a movable part of a machine in such manner that the motion of the machine intermittently brings it into contact with some other part to which it imparts an intermittent motion. Tappets are much used in various kinds of valve-gear, in printing-machinery, and in a great variety of machines in which intermittent movements are performed.
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Chambers's Twentieth Century Dictionary
    • n Tappet tap′et (Spens.) tapestry.
    • n Tappet tap′et a projecting arm, lever, &c. from any moving part of a machine supplying intermittent motion to some other part
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In literature:

Tappets, cams, and eccentrics were all tried, to work the slide valve, to obtain the best results.
"A History of Aeronautics" by E. Charles Vivian
For the rest, he filled gas tanks, changed and pumped up tires, tested batteries, oiled tappets.
"Half Portions" by Edna Ferber
No levers, springs, tappets, or reversing valves.
"Scientific American, Volume XXXVI., No. 8, February 24, 1877" by Various
The most important are the camshaft, the camshaft rocker lever roller and the tappet.
"The Working of Steel" by Fred H. Colvin
Tappet-hen, a large measure of claret holding three magnums or Scots pints.
"St. Ronan's Well" by Sir Walter Scott
I was thinking of a tune that would fit to the regular beat of the tappets.
"How I Filmed the War" by Lieut. Geoffrey H. Malins
Tommy was hanging up his battery on account of a loose tappet.
"Blue Goose" by Frank Lewis Nason
Tappet Toc; broche d'entrainement.
"English-French and French-English dictionary of the motor car, cycle, and boat" by Frederick Lucas

In news:

We ask Tom and Ray Magliozzi, NPR's popular "Click & Clack , the Tappet Brothers" After all these years, how do you keep yourselves inspired.
Flat- Tappet Cams and Worn Down Engines.
Flat- Tappet Owners Beware: Your Motor May Be Silently Grinding Itself Away.
Tom and Ray Magliozzi, the Tappet Brothers of 'Car Talk' fame, announced that they will end their 35-year run on public radio in September.
2 Initially, the small-block was assembled with a factory hydraulic flat-tappet cam.
Rollers eliminate the need to the special lubricants that flat tappet cams require and make easy power.
Tom and Ray Magliozzi — "Click and Clack, the Tappet Brothers" — have been dispensing expert car advice and more on the Peabody Award-winning program for 10 years.
For more than two decades, Tom and Ray Magliozzi (aka Click and Clack the Tappet Brothers) have been America's funniest auto mechanics on Car Talk .
Car Talk is a weekly car talk show hosted by brothers Ray and Tom Magliozzi (aka "Click and Clack, The Tappet Brothers"), who are long-time mechanics.
Installation of a cam thrust button is recommended when switching from a flat-tappet cam to a retro-roller cam.
In a flat-tappet Corvette engine, the taper of the cam lobe exerts rearward pressure on the cam, as does the distributor gear that drives the oil pump.
Side by side, a roller cam's lobes (left) seem much brawnier and beefier than those of a flat tappet.
Flat-tappet lifters are designed to spin so that their crown wears evenly.