US 12,296,419 B2
Arrangement of a tightening device for a screw connection and a safety device
Frank Hohmann, Warstein (DE); and Jörg Hohmann, Meschede (DE)
Filed by Frank Hohmann, Warstein (DE); and Jörg Hohmann, Meschede (DE)
Filed on Jan. 26, 2022, as Appl. No. 17/584,426.
Claims priority of application No. 10 2021 102 230.4 (DE), filed on Feb. 1, 2021.
Prior Publication US 2022/0241912 A1, Aug. 4, 2022
Int. Cl. B23P 19/06 (2006.01)
CPC B23P 19/067 (2013.01) 11 Claims
OG exemplary drawing
 
1. An arrangement comprising a tightening device (11) for a screw connection and further comprising a safety device (30) assigned to the tightening device (11), wherein the screw connection comprises a threaded bolt (1B) and a threaded nut (3) resting on a support surface (5A), wherein:
the tightening device (11) comprises
a support tube (8) surrounding the threaded nut (3) of the screw connection and resting against the support surface (5A),
a cylinder housing (7) arranged in the extension of the support tube (8),
a hydraulically driven piston (25) arranged in the cylinder housing (7) so as to be moveable along an axis (A),
an exchangeable bush (12) configured to be carried by the piston (25) on the axis (A) and comprising an internal thread (13) for screwing the exchangeable bush (12) to the threaded bolt (1B) of the screw connection,
a carrier (16) arranged rotatably in the support tube (8) and configured to be connected to the threaded nut (3) of the screw connection by force fit or form fit,
wherein the safety device (30) comprises
a threaded sleeve (31) arranged outside the cylinder housing (7) and the support tube (8) and comprising an internal thread (33) configured to engage a threaded bolt (1C) located adjacent to the threaded bolt (1B) of the screw connection, and
a protective arm (32) attached to the threaded sleeve (31) and extending over the cylinder housing (7) of the tightening device (11), wherein the protective arm (32) is attached to the threaded sleeve (31) so as to be adjustable transversely to the axis (A) of the cylinder housing (7);
wherein the threaded sleeve (31) has a circumferential groove (41) configured to receive the protective arm (32) in a transversely movable fashion, wherein the circumferential groove (41) is formed partly by the threaded sleeve (31) and partly by an end piece (42) attached to an end of the threaded sleeve (31) to which the protective arm is connected.