Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1990-04-06
1991-09-17
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 573, 81 5733, 81 582, B25B 1700
Patent
active
050483773
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a gripping and rotating tong device for handling drill rods, drill bits and other corresponding, at least partially rod-like pieces, the tong device comprising a housing which is fastened to movable transfer means and has an axial hole and a radial aperture for the taking of the piece to be handled from outside the housing to inside the housing; in the housing, gripping means which grip the piece entering the housing; and parts for rotating the gripping means selectively in either direction. The invention also relates to the use of the gripping and rotating tong device for handling drill rods, rock bolts, drill bits and other corresponding, at least partially rod-like pieces.
It is previously known to handle drill rods, rock bolts and drill bits by means of mechanical devices. In a conventional construction, the drill rods or corresponding pieces are placed in either a circular magazine or a chain magazine, from where a rod-retrieving device outside the magazine is capable, by means of tongs, of transferring one rod at a time to the rod chuck or other point of use, and, in a corresponding manner, removing the rod from it. Thereafter the item transferred into place, for example a drill rod, is connected as an extension to a previous drill rod by means of a screw joint, which requires that the drill rod be rotated. This rotation can be effected, for example, by using the rotation motor of the drilling machine, totally separate rotation devices connected to the rod chuck, or rotation devices connected to the rod-retrieving device. Such constructions are disclosed, for example, in U.S. Pat. Nos. 3 506 075 and 2 972 388, in Finnish Patent Application 843 734, and in Finnish Patent 65 471. In the last-mentioned Finnish patent, the rotation device includes rolls acting against the rod, some of the rolls being driven by hydraulic motors in order to rotate the rod. Patent 65 471 also includes a device, separate from the handling devices, for transferring and holding the drill bits. This drill bit replacer is made up of a basket-like part which grips the drill bit and is fastened to a pivot arm by means of which the drill bit is transferred to the rod. The drill bit is fastened by rotating the rod and not the drill bit.
There are also devices in which the gripping means and the rod-rotating mechanism are combined. German Patent DE-3 521 923 describes a device for making and detaching pipe joints, the device having inside a housing two gripping jaws which can be pressed against the pipe or the rod. The aperture into which the pipe has been introduced in order to be pressed or rotated is closed with a separate closing piece. The closing piece has no mechanism; instead, the pipe is rotated by rotating the piece to which the gripping jaws are fastened. The said two gripping jaws are made up of pieces capable of pivoting about a hinge pin towards the pipe. Patent GB-2 100 639 discloses a construction and its closing piece, otherwise corresponding to the above-mentioned German patent, except that the jaws for gripping the rod are driven by transmission of two rings placed one above the other and rotating in relation to each other, whereas in the German patent there are means one inside the other for this purpose. Furthermore, U.S. Pat. No. 4 060 014 discloses a corresponding construction with its closing piece, the purpose of the construction being to enable the workpiece to be rotated in both directions at any time without the gripping jaws opening from around the workpiece. This patent discloses use of only one ring gear but a large number of other cogged means. Norwegian Patent Application 860 054 discloses a similar construction, but without a closing piece. This construction also has a housing part, into the center of which a pipe can be introduced from the side through an aperture in it. This housing, and thereby the pipe, is rotated by ring gear transmission. The pipe, for its part, is locked in relation to the housing by means of three gripping jaws, one of whi
REFERENCES:
patent: 2000221 (1935-05-01), Dawson
patent: 2550045 (1951-04-01), De Hetre
patent: 2573212 (1951-10-01), Martois
patent: 3196717 (1965-07-01), Sheppard
patent: 4060014 (1977-11-01), Turner
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