US 8,784,161 B1Granted

Mandrel assembly for repairing drill pipe facings

AssigneeTubular Inspection Products, Inc.

InventorsJimmy F. Burleson, Gary Chambers

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Abstract

The mandrel assemblies include a double face box mandrel assembly with box refacing tube, male mandrel adapter for engaging within a bore of the box refacing tube, a box mandrel assembly floating over the male mandrel adapter and connected to a drill pipe connection. A box facing mandrel adapter connects to the male mandrel adapter, an outer face plate mounts over the box mandrel assembly engaging the box refacing tube; an inner face plate mounts over the box facing mandrel adapter shaft and attaches to a flange. A double face pin mandrel assembly with pin refacing tube, male mandrel adapter, and pin facing mandrel adapter engages a male mandrel adapter, a pin mandrel assembly floats over the male mandrel adapter and pin facing mandrel adapter and connects to a drill pipe connection opposite the double face box mandrel assembly.

Claims4

Dependent claims

A double face box mandrel assembly for use on a drill pipe connection, the assembly comprising:

a. a box refacing tube comprising:
(i) a first end and a second end;
(ii) an outer side;
(iii) a shaft bore;
(iv) a counter bore wherein the counter bore has a diameter at least 100 percent larger than the shaft bore;
(v) a flange extending from the outer side and spaced apart from the first end and the second end;
(vi) a plurality of fastening holes in the flange;
(vii) a plurality of male mandrel fastening holes penetrating the second end;
and
(viii) an undercut formed on the outer side and adjacent the flange;
b. a male mandrel adapter for engaging within the shaft bore of the box refacing tube, the male mandrel adapter comprising:
(i) a shaft with a tapped hole for securing to a grinder;
(ii) a mandrel flange connected to the shaft;
(iii) a mandrel shaft adapter attached to the shaft;
and
(iv) a plurality of male mandrel adapter fastening holes;
c. a fastener for connecting the male mandrel adapter to the box refacing tube;
d. a box mandrel assembly slidably engaging the mandrel shaft adapter, the box mandrel assembly comprising:
(i) a first bearing bore;
(ii) a first retainer ring groove;
(iii) a second bearing bore;
(iv) a second retainer ring groove;
(v) a conduit formed between the first and second bearing bores;
(vi) a plurality of tightening holes connecting the box mandrel assembly to a first drill pipe connection;
(vii) a first ball bearing assembly in the first bearing bore and a second ball bearing assembly in the second bearing bore;
and
(viii) a retainer ring for engaging the each retainer ring groove;
e. a box facing mandrel adapter connected to the male mandrel adapter, the box facing mandrel adapter comprising:
(i) a box facing mandrel adapter shaft for engaging with the mandrel shaft adapter through the box mandrel assembly;
and
(ii) a face plate flange with bolt holes, the face plate flange extending from the box facing mandrel adapter shaft;
f. an outer face plate comprising:
(i) a centrally formed face plate bore for mounted over the box mandrel assembly;
and
(ii) a plurality of face plate holes, the outer face plate for engaging the flange of the box refacing tube each face plate hole engaging a fastener;
and
g. an inner face plate comprising:
(i) a centrally formed inner face plate bore for mounting over the box facing mandrel adapter;
and
(ii) a plurality of inner face plate holes, the inner face plate secured to the face plate flange with fasteners.

37 more elements

A double face pin mandrel assembly comprising:

a. a pin refacing tube comprising:
(i) a first end and a second end;
(ii) an outer side;
(iii) a shaft bore and a counter bore formed between the first end and the second end;
(iv) a flange extending from the outer side adjacent the first end;
(v) a plurality of fastening holes formed in the flange;
(vi) an undercut formed on the outer side and adjacent the flange;
(vii) a plurality of male mandrel fastening holes penetrating the second end;
and
(viii) a plurality of tightening holes formed though the outer side;
b. a male mandrel adapter for engaging within the shaft bore of the pin refacing tube, the male mandrel adapter comprising:
(i) a shaft with a tapped hole for securing to a grinder;
(ii) a mandrel flange connected to the shaft;
(iii) a mandrel shaft adapter attached to the shaft;
and
(iv) a plurality of male mandrel adapter fastening holes;
c. a pin mandrel assembly floating over the male mandrel adapter, comprising:
(i) a first bearing bore;
(ii) a first retainer ring groove;
(iii) a second bearing bore;
(iv) a second retainer ring groove;
(v) a third retainer ring groove;
(vi) a conduit formed between the first and second bearing bores;
(vii) a plurality of tightening holes connecting the pin mandrel assembly to a second drill pipe connection;
(viii) a first ball bearing assembly in the first bearing bore and a second ball bearing assembly in the second bearing bore;
and
(ix) a retainer ring for engaging each retainer ring groove;
d. a pin facing mandrel adapter connected to the male mandrel adapter, the pin facing mandrel adapter comprising:
(i) a pin facing mandrel adapter shaft for engaging with the mandrel shaft adapter through the pin mandrel assembly;
and
(ii) a face plate flange with bolt holes, the face plate flange extending from the pin facing mandrel adapter shaft;
e. an outer face plate comprising:
(i) a centrally formed face plate bore for mounting over the pin mandrel assembly;
and
(ii) a plurality of face plate holes, the outer face plate for engaging the flange of the pin refacing tube, each face plate hole engaging a fastener;
and
f. an inner face plate comprising:
(i) a centrally formed inner face plate bore for mounting over the pin facing mandrel adapter;
and
(ii) a plurality of inner face plate holes, the inner face plate secured to the face plate flange with fasteners.

37 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/142,194Filed 27 Dec 2013
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B24D 9/04
Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper: rigid drums for carrying flexible…
B24B 5/04
Involving centres or chucks for holding work: for grinding cylindrical surfaces externally
B24B 5/06
Involving centres or chucks for holding work: for grinding cylindrical surfaces internally
B24D
Tools for grinding, buffing or sharpening

Family

No related US applications are recorded in the indexed filing history.

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