Title: Bolt tightening apparatus and method

Abstract: Apparatus for pre-tensioning a series of screwthreaded fasteners comprising an even number of such fasteners arranged on a common pitch circle, the apparatus including a ring member adapted to apply pre-tensioning forces to alternate fasteners by way of adaptors applied to said fasteners, the ring member being supported above the remaining fasteners by way of respective hydraulic piston and cylinder arrangements.

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Inventors: Stansfield, Fred (Oldham, EN)

Application Number: 687946
Filing Date: 1976-05-19
Publication_date: 1977-03-22
Assignee: Doncasters Moorside Limited (Oldham, EN)
Primary Class(es): 29/446 29/525.02, 81/57.38, 254/29A
Other Classes:
US Patent Ref:

2866370	Dec, 1958	Biach	81/57.
3722332	Mar, 1973	Jones	81/57.
3749362	Jul, 1973	O'Connor	254/29.
3847041	Nov, 1974	Meschonat et al.	81/57.
3877326	Apr, 1975	Kock	81/57.
3965565	Jun, 1976	Fujii	29/446.

Other Refs: 1,390,012

Apr, 1975	UK

Primary Examiner: Moon, Charlie T.
Assistant Examiner:
Attorney: Barber; Sherman H.