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A rock breaking device employs a falling weight and a striker pin or other tool held within a tool holding structure supported by a recoil assembly includes a number of isolator structures that protect the rock breaking device by absorbing excess forces that may be applied to the recoil assembly. Ea

A rock breaking device employs a falling weight and a striker pin or other tool held within a tool holding structure supported by a recoil assembly includes a number of isolator structures that protect the rock breaking device by absorbing excess forces that may be applied to the recoil assembly. Each isolator structure includes a front plate that extends below a lower side of a recoil tube flange. In new rock breaking devices, the front plates may be incorporated as part of the isolator structures. Alternatively, an existing rock breaking device can be retrofitted by welding a heavy plate onto the front of an existing front plate of the isolator structures. The heavy plate extends beyond the lower side of the recoil tube flange to provide greater strength.

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1. A rock breaking device comprising: a mast having an upper end portion, a lower end portion and a vertical axis;a weight slidably disposed to move along the mast in a constrained manner;a recoil arrangement comprising: a recoil tube having an upper end portion and a lower end portion operatively c

1. A rock breaking device comprising: a mast having an upper end portion, a lower end portion and a vertical axis;a weight slidably disposed to move along the mast in a constrained manner;a recoil arrangement comprising: a recoil tube having an upper end portion and a lower end portion operatively connected to the mast so that it can move relative thereto, and so that the upper end portion of the recoil tube is located proximate the lower end portion of the mast and the lower end portion of the recoil tube extends below the lower end portion of the mast, anda panel-shaped upper flange secured to an external surface of the upper end portion of the recoil tube such that a plane defined by the upper flange is generally perpendicular to the vertical axis, the upper flange having an outwardly extending upper surface, an outwardly extending lower surface and a peripheral edge spanning the upper and lower surfaces;a tool holding structure secured proximate the lower end portion of the recoil tube and configured to receive a tool; andan isolator arrangement comprising an isolator structure secured proximate the lower end portion of the mast and proximate the upper surface of the upper flange, the isolator structure arranged to support the recoil tube, andan isolator plate secured to the isolator structure, with a portion of the isolator plate extending below the isolator structure in a generally cantilever fashion, with said portion spaced outwardly from the recoil tube, with said portion positioned adjacent the peripheral edge of the upper flange and with said portion extending below the lower surface of the upper flange, the peripheral edge of the upper flange being movable relative to said portion as the recoil tube moves relative to the mast, wherein the isolator plate alleviates stresses imparted to the rock breaking device when the recoil arrangement, tool holding structure, and tool are used to position a rock for breaking. 2. The rock breaking device of claim 1, further comprising a plurality of isolator arrangements, each isolator arrangement comprising: an isolator structure secured proximate the lower end portion of the mast and proximate the upper surface of the upper flange, the isolator structure arranged to support the recoil tube; andan isolator plate secured to the isolator structure, with a portion of the isolator plate extending below the isolator structure in a generally cantilever fashion, with said portion spaced outwardly from the recoil tube, with said portion positioned adjacent the peripheral edge of the upper flange and with said portion extending below the lower surface of the upper flange, wherein the isolator plate is arranged to alleviate stresses imparted to the rock breaking device when the recoil arrangement, tool holding structure, and tool are used to position a rock for breaking. 3. The rock breaking device of claim 2, wherein the plurality of isolator plates substantially encircle the upper flange. 4. The rock breaking device of claim 1, wherein the isolator structure comprises: a plurality of plate members secured to the mast so that they are generally parallel with the vertical axis of the mast, and so that the plate members are generally parallel with one another; andan isolator flange secured to the mast and to the plate members in a generally perpendicular relationship, with the plate members, the isolator flange, the isolator plate, and a portion of the mast arranged to define an isolator pocket; andan isolator buffer disposed within the isolator pocket. 5. The rock breaking device of claim 1, wherein the isolator plate further comprises a first side extension configured and arranged so that said first side extension is positioned adjacent the peripheral edge of the upper flange, said first side extension extends below the lower surface of the upper flange, and said first side extension is movable with respect to the peripheral edge of the upper flange as the recoil tube moves relative to the mast. 6. The rock breaking device of claim 5, wherein the isolator plate further comprises a second side extension configured and arranged so that said second side extension is positioned adjacent the peripheral edge of the upper flange, said second side extension extends below the lower surface of the upper flange, and said second side extension is movable with respect to the peripheral edge of the upper flange as the recoil tube moves relative to the mast. 7. The rock breaking device of claim 6, wherein the first and second side extensions extend in opposite directions from each other. 8. The rock breaking device of claim 6, wherein the first and second side extensions have a combined width that is substantially equal to the peripheral edge of the upper flange. 9. The rock breaking device of claim 6, wherein the first and second side extensions have a combined width that is greater than a width of the mast. 10. The rock breaking device of claim 1, wherein the isolator structure comprises: a plurality of plate members secured to a portion of the mast such that they are generally parallel with the vertical axis of the mast, the plate members generally parallel with one another; anda flange having an upper surface and a bottom surface, the flange secured to the mast and to portions of the plate members;wherein the plate members, the flange, and a portion of the mast define an outwardly and upwardly opening pocket. 11. The rock breaking device of claim 10, wherein a portion of the isolator plate is secured to portions of the plate members and the flange, and wherein the plate members, the flange and the isolator plate further define an upwardly opening pocket. 12. The rock breaking device of claim 1, wherein the recoil tube is resiliently connected to the mast. 13. The rock breaking device of claim 1, wherein the peripheral edge of the upper flange includes an inwardly extending, transverse slot. 14. The rock breaking device of claim 13, wherein the isolator plate has a width that is greater than a width defined by the transverse slot.