Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Metal Working

Supercharged-power-tongs

Electrically heated riser pipe for a fluid supply system

Referring now to the drawing, in which the same reference numbers designate the same elements in ...

Electrical energy supplied heat-emitting radiator

What is claimed is: 1. A heat-emitting radiator supplied with electrical energy and adapted for ...

Hydrogen gas relief valve

Electrochemical devices or systems of the type referred to herein include one or more of the metal-...

Cap for accumulator elements with device for automatic filling

OF THE INVENTION With reference to the mentioned drawings, the cap, indicated as a whole by ...

Poppet configuration for counterbalance valve

It is a feature of the present invention to provide an improvement in counterbalance valves which ...

Washing machine with a control system for controlling the supply of water

With the above discussion in mind, it is an object of the present invention to provide a washing ...

Electrically heated vaporizer device for dispensing a thermally volatilizable substance

I claim: 1. A device for dispensing a thermally volatilizable substance, comprising: a hollow ...

Method and apparatus for purification and activation of water

The foregoing objects are attained, according to the present invention, by utilizing a method and ...

In situ off-shore processing of urban sewage without using or contaminating urban land

What is claimed is: 1. A substantially stationary and substantially permanently positioned self-...

Apparatus for embossing and printing information on charge sales slip

In accordance with the principles of the present invention, there is provided apparatus for ...

Supercharged power tongs

Details

Inventors: Yuehui, Chen; Kun, Gao;
Assignee: The Science & Technic Department of Dagang Petroleum Administration (Tien Jing, CN)
Primary Examiner: Schmidt; Frederick R.
Assistant Examiner: Rachura; Maurina
Attorney, Agent or Firm: Christie, Parker & Hale

A supercharged power tongs for making up or breaking apart drill tools used in oil or geologic drilling engineering is designed to take the place of B-type tongs. Supercharger and assist fluid cylinders are adopted in the gripping and torqueing devices respectively which are completely new provisions. An automatic make-up torque limitator is built in the control system. A pull-in locating device is used for moving the power tongs. This invention is particularly adequate for make-up and break apart operations on drill pipes, drill collars, kellys and lifting subs when the sizes of these drill tools vary from time to time, with no necessity for replacements of any components.

DETAILED DESCRIPTION An object of the present invention is to provide suspended power tongs including upper and lower tongs each having a pair of gripping devices.
The way said upper and lower tongs connect with each other enables them to swivel relatively clockwise or counterclockwise from their coincident positions around a fixed axis (the axis of drill tools) over a certain angle under the guide of a guiding device to complete the movements for making up or breaking apart joints of drill tools.
Another object of the present invention is to provide supercharged gripping devices mounted on both upper and lower tongs to offer large forces so as to grip joints of drill tools sufficiently and thus to ensure reliable transmission of the large torques exerted when making up or breaking apart.
The supercharged gripping devices can even automatically adapt the variation of the size of the drill tools gripped and accurately grip drill tools without adjustment when the size of drill tools being changed.
The gripping or releasing action of two opposite movable tong dies can be realized synchronously by means of a synchronizing machanism.
Another object of the present invention is to provide a combinatory torque-generating unit enabling upper and lower tongs to swivel relatively and offering normal makeup or break-apart torques with larger ones at the beginning of break-apart operation.
Still another object of the present invention is to provide a compact pull-in locating device used to haul power tongs to grip drill tools accurately.
A further object of the present invention is to provide a control system consisting of hydraulically powered units and pipings to enable power tongs to be operated according to predetermined procedures.
A still further object of the present invention is to provide locking devices in both upper and lower tongs to enable them to be operated individually or jointly.
The last object of the present invention is to provide adjustable devices making tong dies have certain flexibility to have tong bodies evenly pressured and adapt automatically the irregular joints of drill tools caused by eccentric wear

Related patents

	Torque transfer apparatus The improved combined tong apparatus for assembling and disassembling members having mating threaded connections, according to the present invention, is characterized by ...
	Load equalizer pier head This invention is a load equalizing pier for a coach. The pier comprises a stand for placement on the ground and a head for placement under a load. The stand includes ...
	Automated spar assemby tool We claim: 1. An automated assembly machine for fabricating large mechanical structures from a multiplicity of individual parts, comprising: a floor assembly jig having a ...
	Method for making a head of piolet It is an object of the invention to provide a method for making a head of a piolet which avoids these disadvantages and which is simple, fast and economical, and ...
	Interlocking jaw power tongs It is therefore an object of this invention to provide a power tongs tool which does not subject the ring gear to spreading forces. It is another object of this ...
	Wrench for transmitting variable magnitude vibrational forces to bolt Having described my invention in such terms as to enable those skilled in the art to understand and practice it, and having identified the presently preferred ...
	Parts catcher for an automatic machine I claim: 1. A finished parts catcher for an automatic machine having a work holder and parts cut-off means, comprising: (a) a finished parts receptacle adapted to be ...
	Bag transfer apparatus The present invention provides apparatus which can simultaneously pinch a plurality of elongated bags disposed side-by-side, parallel to one another and in close ...
	Trailer and trailer unloading system An elongated roller trailer constructed in accordance with the present invention has a framework including four longitudinal support members, two main members on either ...
	Work table for pattern matching The present invention was contrived in view of the foregoing situations in the prior art, and aims at providing a work table for pattern matching which enables the ...

0.014
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved