US 4,048,875 AGranted

Apparatus for screwing a threaded nut onto a steel rod

AssigneeDyckerhoff & Widmann Aktiengesellschaft

InventorsRichard Heinen, Georg Rieger

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Abstract

The tool or device of the invention operates on an anchoring rod of the type which has spiral threads which threads only extend around a portion of the circumference thereof. Such an anchoring rod, when used to secure ceilings in mines, for example, has to be screwed into anchoring position and then have a nut screwed in the free end thereof to secure it against a steel plate applied against the wall of the ceiling. The device of the invention is in the form of a sleeve having an aperture at one end adapted to receive the nut to be applied and a means at the other end to connect to a torque applying device. Back of the nut receiving aperture, means are provided in the sleeve device which can, optionally, cause the rod, the end of which extends through the nut, to rotate with the sleeve, or to remain stationary while the nut is screwed thereon, whereby the insertion of the rods into the bore holes and the tightening of the nut thereon, can be accomplished rapidly with only one fitting of the tool thereon.

Claims14

Dependent claims

A device for screwing a threaded nut onto a rod of the type which has a partial spiral winding made up of spirally arranged ribs positioned on opposite sides thereof to leave substantially planar areas on opposite sides of the rods between the ribbed areas, the ribs sloping in opposite directions in passing from the planar areas, said device comprising a tubular sleeve adapted to surround a substantial length of ribbed rod and having

a recess at a first end adapted to receive a nut to be screwed into the rod,
means at the opposite end adapted to receive a driving means for imparting a twisting moment thereto,
locking means cooperating with said sleeve adapted to releasably lock the sleeve onto a portion of the rod which extends through a threaded nut to which the first end of the sleeve is applied whereby rotation of the sleeve also rotates the rod when said locking means is operative, but permits the sleeve to rotate the nut with respect to the rod when the locking means is inoperative,
said sleeve contains an opening extending transversely thereof, and said locking means operates in said opening.

1 more element

Dependencies are inferred from the claim text.