(ש"ע) תותב (במכניקה ואלקטרוניקה)

n. (Mechanics, Electronics) insulated device that enables an electrical conductor to pass in a safe manner through an earthed conducting barrier; metal insert used to reduce friction; bearing for a revolving shaft

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Noun
1. an insulating liner in an opening through which conductors pass
(hypernym) insulator, dielectric, nonconductor
(derivation) bush
2. a cylindrical metal lining used to reduce friction
(synonym) cylindrical lining
(hypernym) lining
(derivation) bush

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Noun
1. a low woody perennial plant usually having several major branches
(synonym) shrub
(hypernym) woody plant, ligneous plant
(hyponym) Catha edulis
(member-holonym) shrubbery
2. a large wilderness area
(hypernym) wilderness, wild
(hyponym) outback
3. dense vegetation consisting of stunted trees or bushes
(synonym) scrub, chaparral
(hypernym) vegetation, flora
4. hair growing in the pubic area
(synonym) pubic hair, crotch hair
(hypernym) hair
(hyponym) minge
(part-holonym) adult body

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Verb
1. provide with a bushing
(hypernym) supply, provide, render, furnish
(derivation) bushing

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Adjective
1. not of the highest quality or sophistication
(synonym) bush-league
(similar) inferior

(p. pr. & vb. n.)
of Bush
  

(n.)
The operation of fitting bushes, or linings, into holes or places where wear is to be received, or friction diminished, as pivot holes, etc.
  

(n.)
A bush or lining; -- sometimes called a thimble. See 4th Bush.
  

A pipe fitting on which the external thread is larger than the internal thread to allow two pipes of different sizes to be connected
  

See also : Kelly Bushing
  

بوش رانش کِلی
  

A special device that, when fitted in to the master bushing, transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make hole. It may be shaped to fit the rotary opening or have pins for transmitting torque. Also called the drive bushing. See also : Kelly
  

KB
  

A device that fits into the rotary table to accommodate the slips and drive the kelly bushing so that the rotating motion of the rotary table can be transmitted to the kelly. Also called : Rotary Bushing
  

کِلی بوشینگ چرخنده ، بوش کِلی دوار که به رُوتاری تِیبِل متصل بوده و کِلی از میان آن عبور می نماید و باعث انتقال چرخش به رشته حفاری می گردد
  

RKB
  

WB, work on, actions or job's abbreviations which usually Companymans write in their daily drilling reports