# US 8,784,161 B1 · Mandrel assembly for repairing drill pipe facings

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- Number: US 8,784,161 B1
- Document ID: US8784161B1
- Status: Granted
- Kind: B1
- Application number: 14/142,194
- Filed: 2013-12-27
- Granted: 2014-07-22
- Earliest claimed: 2013-12-27
- Assignees: Tubular Inspection Products, Inc.
- Applicants: Tubular Inspection Products, Inc.
- Inventors: Jimmy F. Burleson; Gary Chambers
- Web page: https://patentgrep.com/patent/US8784161B1

## CPC

- B24D 9/04: Rigid drums for carrying flexible material
- B24B 5/04: for grinding cylindrical surfaces externally (grinding combined cylindrical and conical surfaces B24B5/14)
- B24B 5/06: for grinding cylindrical surfaces internally (B24B5/40 takes precedence)
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The assembly of claim 1, comprising an abrasive material mounted to the outer face plate for enabling refacing of a drill pipe connection shoulders simultaneously.

### Claim 3

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.

### Claim 4 (depends on 3)

The assembly of claim 3, comprising an abrasive material mounted to the outer face plate for enabling refacing of a drill pipe connection to simultaneously cut from the inner face plate to the outer face plate.