E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/35, 138/69.1
E21B 15/04 (2006.01)
Patent
CA 1056367
ABSTRACT OF THE DISCLOSURE A supporting mechanism for a rotary rock drill comprising a jib pivoted at its inner end to a support structure, for example a vehicle, and a drill carriage mounted for pivotal movement about an axis parallel to the jib pivotal axis on the outer end of the jib. The supporting mechanism includes a hydraulic levelling system for the drill carriage comprising a pair of hydraulically-interconnected linearly expansible and contractible hydraulic jacks. The first jack is pivotally connected between the jib and its support structure to sense angular movement of the jib relative to the support structure about the pivotal axis of the jib. The second jack is pivotally connected between the jib and the drill carriage to control the orientation of the latter. The levelling system is so constructed and arranged that the triangle whose corners are respectively constituted by the pivotal connection of the first jack to the support structure, the pivotal connection of the jib to the support structure, and the pivotal connection of the first jack to the jib, and the triangle whose corners are respectively constituted by the pivotal connection of the second jack to the drill carriage, the pivotal connection of the jib to the drill carriage and the pivotal connection of the second jack to the jib, are similar triangles, and that on pivotal movement of the jib relative to the support structure the ratio of the corresponding changes in operative length of the hydraulic jacks equals the ratio of similarity of the said triangles whereby the drill carriage is maintained in parallelism throughout said pivotal movement of the jib.
256182
Barber Antony D.
Fisher Zdenek
Compair Construction And Mining Limited
Na
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