Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1980-06-03
1983-04-19
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
B25B 2902
Patent
active
043801811
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with a device for use in inserting, tensioning and removing screw-threaded studs. It is concerned particularly for use in inserting and removing the studs which hold together atomic pressure vessels but other applications of the device are possible.
In an atomic pressure vessel the cover is usually held in place by means of closely spaced screw-threaded studs which are inserted into screw-threaded bores in a flange around the top of the body of the atomic pressure vessel. The studs pass through bores in the periphery of the cover which is placed over the body and the cover is clamped in place by tightening working nuts onto the exposed ends of the studs. In the past the studs and nuts have been inserted and removed with the aid of hand held power tools by workmen working directly on top of the cover. Each stud is inserted and each nut tightened individually. Because of the level of radiation at the cover and the time needed to fit all the stud and nuts each workman may be exposed to the full yearly dose of radiation which regulations permit, during one operation.
More recently multiple stud tensioning devices have been designed which can operate on several studs simultaneously, tensioning the studs and tightening or slackening the working nut as required. Separate multiple stud removing devices have also been designed which, once the working nuts have been removed can remove several studs from their respective screw-threaded bores simultaneously.
The present invention provides a device which can insert a stud into a bore, tension the studs, tighten a working nut on the stud, slacken the working nut on the stud and remove the stud from the bore. In its preferred form the invention provides several such devices which can be operated simultaneously.
According to the present invention there is provided a stud manipulating device for inserting a stud into a bore in a workpiece, tensioning the stud, tightening a working nut on the stud, or for slackening the nut on the stud and removing the stud from the workpiece, the device comprising means for engaging the working nut and interlocking with the nut against relative rotational movement, first drive means coupled to the working nut engaging means and operable in use to rotate the working nut, a top nut for securing onto the end of the stud, second drive means operable to rotate the top nut, means for raising and lowering the top nut, a hydraulic pressure member located between the top nut and the workpiece and operable to tension the stud by means of the top nut, stud engaging means engagable with the stud to interlock with the stud against relative rotational movement, means for raising and lowering the stud-engaging means, and clutch means operable between the second drive means and the stud engaging means and which is engaged when the top nut is in a raised position and the stud-engaging means is in a lowered position, to couple the stud engaging means in rotation with the second drive means.
To remove a stud using this device the stud engaging means is engaged with the end of the stud. The stud may have a specially formed end part for interlocking with the stud engaging means. The top nut is lowered to the stud and rotated by the second drive means to screw it on the end of the stud. The hydraulic pressure member is pressurised to raise the top nut and thus tension the stud. With the stud tensioned the working nut is unscrewed using the first drive means. The tension in the stud is released by releasing the pressure in the hydraulic pressure member and the top nut is unscrewed from the stud and raised until the clutch means engage. The second drive means are then operated to unscrew the stud from its bore.
To insert a stud, tension it and tighten the working nut the operation is performed in reverse.
In the preferred form of the invention several such devices are provided and their drive means and raising and lowering means interconnected for operation in unison.
We have also invented a method of preventing water entering t
REFERENCES:
patent: 3844533 (1974-10-01), Markiewicz et al.
patent: 3877326 (1975-04-01), Kock et al.
patent: 4020720 (1977-05-01), Fujii
patent: 4047456 (1977-09-01), Scholz
patent: 4273011 (1981-06-01), Exner et al.
Jones Jr. James L.
Pilgrim Engineering Developments Limited
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