Drill deck bushing
First Claim
1. A shock absorbing guide bushing mountable in the drill deck of a drilling rig, comprising:
- a generally tubular outer shell adapted to be nonrotatably mounted in the drill deck;
a generally tubular inner liner substantially coaxially and rotatably mounted within and spaced apart said outer shell forming an annular space therebetween, said inner liner having an inner bore adapted for receiving and guiding a drill string extending through the drill deck;
shock absorbing cushion roller means disposed in said annular space between said inner liner and said outer shell for cushioning and absorbing lateral impact loads imparted to said inner linear by the drill string; and
first retainer means disposed on said outer shell and engageable with second retainer means disposed on said inner liner for permitting said inner liner to rotate with respect to said outer shell while preventing axial separation of said outer shell and said inner liner.
1 Assignment
0 Petitions
Accused Products
Abstract
A shock absorbing roller deck bushing for rotary blast hole drills has a steel inner liner with a cylindrical axial bore for receiving a drill string. The liner is rotatably disposed within an outer shell mounted in the drill deck. A split retainer plate is attached to the outer shell and has an inwardly projecting flange around its inner periphery which is captured between a pair of radially outwardly projecting flanges around the outer periphery of the liner. The flanges permit limited lateral movement of the liner with respect to the outer shell, but prevent the liner from being removed axially from the shell. A plurality of shock absorbing cushion roller assemblies are mounted vertically in slotted cages between the liner and shell. The roller assemblies each include a shaft surrounded by a sleeve within a cushion coating bonded to the sleeve, with thrust washers between the ends of the sleeves and the cages. The roller assemblies are free to turn about their shafts and rotate with the liner, and to move radially of the deck bushing to a limited extent, when impacted by the liner. The roller assemblies absorb and dampen impact loads imparted to the liner by the drill pipe.
22 Citations
25 Claims
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1. A shock absorbing guide bushing mountable in the drill deck of a drilling rig, comprising:
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a generally tubular outer shell adapted to be nonrotatably mounted in the drill deck; a generally tubular inner liner substantially coaxially and rotatably mounted within and spaced apart said outer shell forming an annular space therebetween, said inner liner having an inner bore adapted for receiving and guiding a drill string extending through the drill deck; shock absorbing cushion roller means disposed in said annular space between said inner liner and said outer shell for cushioning and absorbing lateral impact loads imparted to said inner linear by the drill string; and first retainer means disposed on said outer shell and engageable with second retainer means disposed on said inner liner for permitting said inner liner to rotate with respect to said outer shell while preventing axial separation of said outer shell and said inner liner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A shock absorbing guide bushing mountable in the drill deck of a drilling rig, comprising:
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a generally tubular outer shell adapted to be nonrotatably mounted in the drill deck; a generally tubular inner liner substantially coaxially and rotatably mounted within and spaced apart from said outer shell forming an annular space therebetween, said inner liner having an inner bore adapted for receiving and guiding a drill string extending through the drill deck; shock absorbing cushion roller means disposed in said annular space between said inner liner and said outer shell for cushioning and absorbing lateral impact loads imparted to said inner liner by the drill string; wherein said inner liner is rotatable with the drill string, and said cushion roller means, when actuated by said inner liner being impacted by the drill string, are engageable with the exterior side wall surface of said inner liner and rotatable therewith.
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11. A shock absorbing guide bushing mountable in the drill deck of a drilling rig, comprising:
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a generally tubular outer shell adapted to be nonrotatably mounted in the drill deck; a generally tubular inner liner substantially coaxially and rotatably mounted within and spaced apart from said outer shell forming an annular space therebetween, said inner liner having an inner bore adapted for receiving and guiding a drill string extending through the drill deck; shock absorbing cushion roller means disposed in said annular space between said inner liner and said outer shell for cushioning and absorbing lateral impact loads imparted to said inner liner by the drill string; wherein said inner liner transmits such lateral impact loads from the drill string to said cushion roller means, and wherein the portion of said cushion roller means disposed in the direction of such lateral impact loads engages said inner liner and cushions and absorbs such lateral impact loads, and wherein said portion of said cushion roller means also cushions and absorbs thrust loads imparted to said inner liner by the drill string along with such lateral impact loads.
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12. A shock absorbing guide bushing mountable in the drill deck of a drilling rig, comprising:
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a generally tubular outer shell adapted to be nonrotatably mounted in the drill deck; a generally tubular inner liner substantially coaxially and rotatably mounted within and spaced apart from said outer shell forming an annular space therebetween, said inner liner having an inner bore adapted for receiving and guiding a drill string extending through the drill deck; shock absorbing cushion roller means disposed in said annular space between said inner liner and said outer shell for cushioning and absorbing lateral impact loads imparted to said inner liner by the drill string, said shock absorbing cushion roller means including a plurality of vertically disposed cushion roller assemblies circumferentially spaced apart around the exterior side wall of said inner liner in said annular space, each of said cushion roller assemblies including a roller shaft; a cushion coating support sleeve loosely disposed around said roller shaft, the upper and lower ends of said roller shaft protruding from said sleeve; and a shock absorbing cushion coating affixed to the exterior surface of said sleeve, said coating having an outside diameter slightly smaller than the radial width of said annular space between said inner liner and said outer shell. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A drill deck shock absorbing guide bushing, comprising:
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an outer shell nonrotatably mounted in the drill deck; an inner liner rotatably mounted within, and substantially coaxial with, the outer shell, the inner liner having a central axial bore adapted for receiving and guiding a drill string extending therethrough, there being an annular chamber between the outer shell and the inner liner; a split retainer plate removably mounted on the upper end of said outer shell, said split retainer plate having an inwardly projecting annular flange around its radially inner surface disposed and captured between a pair of radially outwardly projecting annular flanges around the upper exterior surface of said inner liner, said flanges preventing the axial separation of said inner liner and outer shell while permitting relative rotation therebetween; and a plurality of shock absorbing cushion roller assemblies vertically disposed in said annular chamber circumferentially spaced apart around said inner liner and engageable with said inner liner when said inner liner is moved toward said cushion roller assemblies due to impacts from the drill string, said cushion roller assemblies being rotatable with said inner liner and absorbing and cushioning the lateral and thrust loads imparted to said inner liner by the drill string. - View Dependent Claims (24, 25)
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Specification