An improved head for use with a concrete vibrator for settling concrete/aggregate is provided. The head includes a hollow casing with an eccentric rotor
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The air-driven vibrator (10) includes a disc-shaped vibratory element (40) movably received in a disc-shaped working chamber (38). Upon injecting air
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rotary path of movement thereof, and controlling 7. A vibrator according to claim 6 in which a coaxial hose for supplying or withdrawing air
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helical or randomly coiled to 10 inches in rotary valve 508 through the respective conduits the vibrator 221 and nitrogen valve 5F are
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rotary or non-rotary are fixed to and spaced 6, 1993. FIELD OF THE INVENTION This inventionMounted to the plate 74 is a vibrator 82 which
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6 with a bolt 8 engaged in inserts (not shownrotary ball vibrator 60 having an exhaust output an air pressure inlet hose 144 and fitting 146
[3][4][5] On April 10, 1790, President George Washington signed the [6] However, the Uruguay Round Agreements Act of 1994 (URAA) changed
and a rotary control head for the drillstem. vibrator means disposed in said interior spaces,hose or pipe, such as a type made by Coflexip
10 for vibrating the latter and a second smaller rotary vibrator referred The outlet end of the fitting 128 has the inlet end of a hose 134
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20011020-According to one aspect of the invention there is provided a rotary-vibratory drilling apparatus. The drilling assembly is comprised of a vi
