E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14.7
E21B 19/16 (2006.01) E21B 19/24 (2006.01)
Patent
CA 1262453
Abstract of the disclosure An opening device for an extension rod drilling equipment, comprising a supporting sleeve (3) rotatably mounted in a frame (1), and gripping jaws (6) displace- ably mounted in the sleeve for gripping a drill rod. In order to allow the device to both grip the drill rod and rotate it, the supporting sleeve is connected to a rotating mechanism (14) and provided with cylindrical guideways (4, 5) positioned eccentrically with respect to the axis (A) of the sleeve in such a manner that a rotating movement of the sleeve with respect to the gripping jaws causes a displacement of the gripping jaws towards an aligned rod releasing position and away from the aligned position respectively, depending on the direction of rotation of the supporting sleeve. (Figure 1)
521102
Leppanen Jarmo
Oy Tampella Ab
Swabey Ogilvy Renault
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