Tools – Wrench – screwdriver – or driver therefor – Responsive to movement of work
Reexamination Certificate
2006-06-20
2006-06-20
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Responsive to movement of work
C081S054000, C081S055000, C081S056000
Reexamination Certificate
active
07062998
ABSTRACT:
A hydraulic threaded bolt tightening device (1) for tightening and loosening large bolted connections, comprising a cylinder supported on a machine part to be clamped by means of a threaded bolt and a nut (2), at least one piston which is guided thereon in a sealed manner, with a threaded bush screwed on to one end of the threaded bolt and which can be pressurized, a pressure medium supply (4) to the threaded bolt tightening device (1), an adjusting ring (6) arranged in the cylinder and connected to the nut (2) by a form fit, and a rotary drive (7) for the adjusting ring (6) with a drive connection (16) to the adjusting ring (6), a rotation angle sensor (8) on the rotary drive, a control device (9) for driving the pressure medium supply (4) to the threaded bolt tightening device (1) and the rotation of the rotary drive (7), an input device (1), and the rotation of the rotary drive (7), an input device (10) for entering the pitch of the threaded bolt, and a computer device (11) for converting the rotation angle of the nut, measured by means of the rotation angle sensor (8), into the extension of the threaded bolt effected by the threaded bolt tightening device (1).
REFERENCES:
patent: 4047456 (1977-09-01), Scholz
patent: 5257207 (1993-10-01), Warren
patent: 5343785 (1994-09-01), Holt et al.
patent: 196 38 901 (1998-03-01), None
patent: 0 223 713 (1987-05-01), None
English language translation of EP 0 830 919 which corresponds to DE 196 38 901.
English language equivalent U.S. 4,829,650 which corresponds to EP 0 223 713.
International Search Report.
Hohmann Frank
Hohmann Jörg
Hail III Joseph J.
McDonald Shantese
Ostrolenk Faber Gerb & Soffen, LLP
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