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A lockable disc brake swivel for use in a drill string is comprised of a tubular swivel housing having a rotatably mounted swivel stem. A disc brake housing is mounted to the swivel housing to encase a radially extending brake disc engaged for rotation with the swivel stem. The disc brake housing al

A lockable disc brake swivel for use in a drill string is comprised of a tubular swivel housing having a rotatably mounted swivel stem. A disc brake housing is mounted to the swivel housing to encase a radially extending brake disc engaged for rotation with the swivel stem. The disc brake housing also has a disc brake surface that may be selectively engaged with the brake disc to allow or prevent rotation of the swivel stem. The brake piston may be hydraulically or pneumatically activated.

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1. A lockable swivel comprising: (a) a tubular swivel housing, said housing providing attachment for a pipe segment;(b) a swivel stem rotatably mounted within said swivel housing, said swivel stem providing attachment for a pipe segment;(c) a brake hub having a radially extending brake disc, said br

1. A lockable swivel comprising: (a) a tubular swivel housing, said housing providing attachment for a pipe segment;(b) a swivel stem rotatably mounted within said swivel housing, said swivel stem providing attachment for a pipe segment;(c) a brake hub having a radially extending brake disc, said brake hub engaged for rotation with said swivel stem;(d) a disc brake housing mounted to said swivel housing, said disc brake housing encasing said brake disc;(e) an extendable and retractable brake piston having a disc brake surface mounted within said brake housing;(f) means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc to prevent or allow rotation of said swivel stem within said housing; and(g) a plurality of splines extending radially around said swivel stem; and(h) a centrally located brake hub on said brake disc, said brake hub rotatably mounted within said disc brake housing, said brake hub configured with a plurality of grooves for receiving said splines of said swivel stem, whereby said swivel stem, said brake hub, and said disc brake are engaged for rotation. 2. The lockable swivel as recited in claim 1 wherein said means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc includes a hydraulically activated brake piston. 3. The lockable swivel as recited in claim 1 wherein said means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc includes a pneumatically activated brake piston. 4. The lockable swivel as recited in claim 1 wherein said swivel housing is provided with a threaded connection for connection to a drill string. 5. The lockable swivel as recited in claim 1 wherein said swivel stem is provided with a threaded end connection for connection to desired equipment. 6. A lockable swivel comprising: (a) a swivel housing, said housing comprised of a tubular longitudinally extending swivel top sub, said swivel top sub having a threaded end for threadable engagement of said swivel top sub with a first pipe segment;(b) a longitudinally extending swivel stem positioned within said swivel top sub, said swivel stem having a radially extending swivel bearing flange and a plurality of radially extending and longitudinally oriented splines, said swivel stem having a threaded end for threadable engagement of said swivel stem with a second pipe segment;(c) a swivel bearing positioned within said swivel top sub against said swivel bearing flange;(d) a swivel nut mounted on said swivel stem and threadably connected within said swivel top sub whereby said swivel stem is rotatably mounted within said swivel top sub,(e) a disc brake assembly mounted to said swivel top sub, said disc brake assembly comprising a disc brake housing, a centrally located disc brake hub rotatably mounted within said disc brake said housing, said disc brake hub having a radially extending brake disc, said brake hub configured with a plurality of grooves for receiving said splines of said swivel stem, whereby said swivel stem, said brake hub, and said disc brake are engaged for rotation, and an extendable and retractable brake piston having a disc brake surface mounted within said brake housing; and(f) means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc. 7. The lockable swivel as recited in claim 6 wherein said means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc includes a pneumatically activated brake piston. 8. The lockable swivel as recited in claim 6 wherein said means for extending and retracting said brake piston for selective engagement of said disc brake surface with said brake disc includes a hydraulically activated brake piston. 9. The lockable swivel as recited in claim 6 wherein said second pipe segment is connected to a drill string. 10. In a drill string, a lockable swivel comprising: (a) a tubular swivel housing, said housing attachable to a pipe segment of a drill string;(b) a swivel stem rotatably mounted within said tubular swivel housing, said swivel stem attachable to a pipe segment of a drill string;(c) a brake hub having a radially extending brake disc, said brake hub engaged for rotation with said swivel stem;(d) a selectively extendable and retractable brake assembly having a disc brake surface mounted for selective engagement with said brake disc whereby extension and retraction of said disc brake surface will arrest or allow rotation of said swivel stem;(e) a plurality of splines on said swivel stem; and(f) a plurality of grooves on the interior of said brake hub engaged with said splines on said swivel stem whereby said swivel stem and said brake hub with said radially extending disc brake are engaged for rotation. 11. The lockable swivel as recited in claim 10 wherein said swivel housing and said swivel stem are provided with threaded connection ends. 12. The lockable swivel as recited in claim 11 wherein the brake assembly comprises a hydraulic piston that selectively extends and retracts the brake surface. 13. The lockable swivel as recited in claim 11 wherein said disc brake surface is selectively extended and retracted by means of a pneumatic piston. 14. The lockable swivel as recited in claim 11 wherein the brake assembly comprises an electromagnet that selectively extends and retracts the brake surface.