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                                                                             By William Fischer

                        Thank you for your continued interest  in Inventor’s  Corner. As we
         head toward the summer months, with talk of trillions of dollars of infrastructure
         work being contemplated, possibly we will start seeing a pickup in construction
         projects  going forward, with a corresponding increase  in economic  activity.
         Personally, I don’t believe that, as long as the government  continues to print
         currency  at their  present  pace, the economy  will significantly  strengthen,  but
         maybe they can increase jobs and business activity by spreading around a little
         of that printed money to someone other than Wall Street. At least maybe we can
         keep the bridges from collapsing and the roads drivable.

         Mobile drilling rig
         Pat. 9,574,403 U.S. class E21B 7/023 Int. class E21B 7/02
         Inventor: Stephano Ferrari, Barbiano, IT.
         Assignee: DRILLMEC SPA (Gariga di Podenzano PC, IT.
           A mobile drilling rig includes a mast, a drilling head for
         sliding in use along the mast, and at least one hoist. The
         drilling head is supported by at least two hoisting wire ca-
         bles. The mast is telescopic and includes a main load carry-

                                                              Figure 2: Drilling rig in the transportation operating configuration.
                                                              ing member, for extending the telescopic mast, at whose end
                                                              a plurality of  pulleys  are  provided, on  which  the  hoisting
                                                              wire cables slide. The main load carrying member is adapted
                                                              to bring the mast from a closed operating configuration to an
                                                              extended operating configuration and vice versa. The move-
                                                              ment of the drilling head, when the mast is in the extended
                                                              operating configuration, takes place by the hoisting wire ca-
                                                              bles, which are pulled and released by the at least one hoist.
                                                               Figures 1 and 2 show, in lateral views, the mobile drilling
                                                              rig in different operating configurations; in detail, Figure 1
                                                              shows the drilling rig in the working operating configura-
                                                              tion, while figure 2 shows the drilling rig in the transpor-
                                                              tation operating configuration; Figures 3 and 4 show dif-
                                                              ferent embodiments of the draw-works or hoist; in detail,
                                                              figure 3 shows the embodiment with four drums on which
                                                              four hoisting wire ropes are wound, while figure 4 shows
                                                              the embodiment with two drums on which two hoisting
                                                              wire ropes are wound.
                                                               With  reference  to  the  above-mentioned  figures,  mobile
         Figure 1: Drilling rig in the working operating configuration.  drilling rig 1 comprises a mast 3, a drill floor 21, on which

         52     Wire Rope News & Sling Technology   June 2017
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