US 4,454,922 AGranted

Drill rod and drilling apparatus

AssigneeConsolidation Coal Company

InventorsWill B. Jamison, Harley G. Pyles

Life of this patent

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Abstract

A drill rod assembly for use in rotary drilling in a mine roof includes a plurality of releasably engageable drill rod members connected in end to end relation. One end of the assembly receives a cutting bit and the opposite end is drivingly connected to a drill chuck of a drill head. Each drill rod member includes a shank end portion, a socket end portion and a body portion extending between the shank end portion and the socket end portion. The shank end portion of each drill rod member is releasably engageable in the socket end portion of an adjacent drill rod member. The length of the drill rod assembly is progressively expanded to the length required for drilling a bore hole of a preselected depth into a mine roof. The shank end portion of each drill rod member is twisted in a helical pattern forming a plurality of helical faces around the axis of the shank end portion. The socket end portion of each drill rod member has an internal bore formed by a plurality of helical faces. The helical faces of the socket end portion have a lead that corresponds to the lead of the helical faces on the shank end portion. The shank end portion of a drill rod member is insertably received in the socket end portion of an adjacent drill rod member where the respective helical faces are positioned in abutting parallel relation. The application of torque to the drill rod assembly urges the abutting helical faces of the connected drill rod members into increasing frictional engagement to prevent separation of the connected drill rod members as the drill rod assembly is retrieved from the drilled bore hole.

Claims24

Dependent claims

A drill rod for rotary drilling comprising,

an assembly of drill rod members, said assembly having a drill bit receiving end portion and a driven end portion,
said assembly being formed by a plurality of releasably engageable drill rod members connected in end to end relation,
said drill rod members each including a shank end portion, a socket end portion and a body portion extending between said shank end portion and sad socket end portion,
said shank end portion of one drill rod member being releasably engageable in said socket end portion of an adjacent drill rod member,
means positioned on the external surface of said respective drill rod members for promoting the flow of air on the external surface of the drill rod adjacent the connection of one drill rod member to another,
said shank end portion having an external surface with a twisted configuration forming a plurality of faces revolving about the axis of said shank end portion,
said shank end portion including an enlarged portion and a reduced portion,
said twisted configuration extending in a continuous angular pattern on said enlarged portion and said reduced portion to provide a plurality of continuous angular faces extending on said enlarged portion and said reduced portion,
said socket end portion having an internal bore with a twisted configuration forming a plurality of faces revolving about the axis of said socket end portion,
said shank end portion of each drill rod member being insertably received in said socket end portion of an adjacent drill rod member,
said shank end portion reduced portion being drivingly received within said socket end portion internal bore,
said socket end portion having an external surface with a twisted configuration forming a plurality of external faces extending in an angular pattern about the axis of said socket end portion, and
said shank end portion faces being positioned in abutting parallel relation with said socket end portion faces so that upon application of torque to said assembly said abutting faces are urged into increasing frictional engagement to prevent separation of said connected drill rod members.

10 more elements

Drilling apparatus comprising,

a drill chuck having a bore,
a cutter bit driving element including a shaft portion terminating at one end in a shank portion,
said shank portion being releasably engageable in said drill chuck bore,
said shank portion having an external surface with a twisted configuration forming a plurality of faces revolving about the axis of said shank portion,
said shank portion including an enlarged portion and a reduced portion,
said drill chuck bore having a twisted configuration forming a plurality of faces revolving about the axis of said bore, said drill chuck bore including an enlarged portion and a reduced portion,
said twisted configuration extending in a continuous angular pattern on said enlarged portions and said reduced portions of said drill chuck bore and said shank portion respectively to provide a plurality of continuous angular faces extending on said enlarged portions and said reduced portions,
said angular faces on said shank portion enlarged and reduced portions extending at a preselected helical angle to form a continuous helical pattern from said enlarged portion to said reduced portion,
said angular faces in said drill chuck bore enlarged and reduced portions extending at a preselected helical angle to form a continuous helical pattern in said drill chuck bore from said enlarged portion to said reduced portion, and
said continuous helical pattern of said shank enlarged and reduced portions corresponding to said continuous helical pattern of said drill chuck bore enlarged and reduced portions respectively so that said shank portion and said drill chuck bore angular faces are positioned in opposed mating relation to drivingly connect said cutter bit driving element to said drill chuck.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/382,375Filed 27 May 1982
Granted: 19 Jun 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

E21B 17/22
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings: rods or pipes with helical structure
E21B 17/03
Couplings; joints: between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
E21B 17/046
Between rod or the like and bit or between rod and rod or the like: with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet…
F16D 1/02
Couplings for rigidly connecting two coaxial shafts or other movable machine elements: for connecting two abutting shafts or the like