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US 8,262,139 B2Granted
Rock-drilling equipment as well as female and male parts therefor
AssigneeSandvik Intellectual Property AB
InventorPeter Nava
Life of this patent
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AssigneeSandvik Intellectual Property AB
InventorPeter Nava
Estimating the term…
A threaded joint interconnects male and female parts of rock-drilling equipment, the female parts including an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a center axis of the female part. The bottom of the thread groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into flanks via concave radius transitions, the radii of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius of the groove bottom increases in the same direction.
Rock-drilling equipment comprising a female part and a male part, which are connectable with each other via a threaded joint in which an internal trapezoidal thread in the female part and an external trapezoidal thread on the male part are included, each one of the threads being in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between front and rear ends of the rock-drilling equipment, the individual thread top touching an imaginary cylinder or cone concentric with a centre axis, wherein the groove bottom of at least one of the threads has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into the flanks via concave radius transitions, the radii of which decrease in the direction axially from one end of the thread ridge toward the other one, at the same time as the radius of the groove bottom increases in the same direction.
Female part for rock-drilling equipments, comprising an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, said top touching an imaginary cylinder or cone that is concentric with a centre axis of the female part, wherein the bottom of the groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and trans-forms into the flanks via concave radius transitions, the radii of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius of the groove bottom increases in the same direction.
Male part for rock-drilling equipments, comprising an external trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between a front end of the male part and a rear end, said top touching an imaginary cylinder or cone that is concentric with a centre axis of the male part, wherein the bottom of the groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and trans-forms into the flanks via concave radius transitions, the radii of which increase in the direction from the front end of the thread toward the rear one, at the same time as the radius of the groove bottom decreases in the same direction.
Dependencies are inferred from the claim text.