Pipe nipple tool

Claim 2

A tool for rotating a pipe nipple comprising a central member having a head element and circumferentially spaced wall segments extending axially therefrom defining jaws, thread means on the inner faces of said jaws defining segmented sections of a sharp crest thread having a standard pipe thread pitch and a thread angle appreciably less than that of a standard pipe, means engaging the outer surface of said jaws for contracting them under pressure to clamp the sharp crest sections against the roots of a standard pipe tapered thread, and means for rotating said central member about the axis of said threads.

Claim 3

a pitch diameter appreciably greater than that of the pipe thread to provide clearance between its sides and a standard pipe thread engageable therewith; and

Claim 4

a pitch diameter appreciably greater than that of the pipe thread to provide clearance between its sides and a standard pipe thread engageable therewith; and

Claim 5

The combination called for in claim 1 in which said engaging means comprises a clamping thread defined on the outer surface of said segmented sides, and a runner nut threaded on said clamping thread to vary the effective crest diameter of said sharp crest thread.

Claim 6

The combination called for in claim 1 including an anvil key element received through said head to closely fit and engage the inside surface of a nipple within said jaws.

Claim 7

a minor crest diameter that is less than that of said pipe thread root diameter for an interference clamping relationship therewith.

Claim 8

a minor crest diameter that is less than that of said pipe thread root diameter for an interference clamping relationship therewith.

Claim 9

The combination called for in claim 3 in which the head element and anvil key element have interfitted elements to secure said elements against relative rotation.

Claim 10

The combination called for in claim 4 in which one of said elements has a wrench engageable shape for rotating said elements simultaneously.

Claim 11

The combination of claim 2 in which the clamping thread turns in a direction opposite to that of said thread means.

Claim 12

The combination of claim 2 in which said sharp crest thread has

Claim 13

The process of threadably tightening and loosening a standard pipe nipple comprising, engaging only the root of the nipple thread circumferentially over a plurality of thread turns with portions of a sharp crest mating thread edge, applying a contracting clamping pressure upon the root of the nipple thread, rigidly supporting the inner wall of the nipple by a member over a substantially peripheral area of engagement within the confines of the area of said clamping pressure, and rotating said member and thread edge portions simultaneously about the axis of said nipple thread to threadably tighten and loosen a standard pipe nipple.

Claim 14

The process of threadably tightening and loosening a standard pipe nipple comprising, engaging only the root of the nipple thread circumferentially over a plurality of thread turns with portions of a sharp crest mating thread edge, applying a contracting clamping pressure upon the root of the nipple thread, rigidly supporting the inner wall of the nipple by a member over a substantially peripheral area of engagement within the confines of the area of said clamping pressure, and rotating said member and thread edge portions simultaneously about the axis of said nipple thread to threadably tighten and loosen a standard pipe nipple.

Claim 15

The steps called for in claim 8 in which said thread edge portions are thread segments having square ends defining sharp corners engaging in the metal at the root of said nipple thread.

Claim 16

The steps called for in claim 8 in which the root is rounded and the thread angle of the standard thread is 60* and the thread angle of the sharp crest mating thread is appreciably less than 60* for the threads to clear at their pitch diameters.

Claim 17

A tool for clamping and rotating a pipe nipple comprising a tumbler-shaped member having an end wall and its sides externally and internally threaded and longitudinally split into quadrants that provide slightly diverging free-ended jaws extending from the end wall, said internal thread having a high sharp crest to engage the roots of a standard pipe thread with a divergence taper appreciably greater than that of a pipe thread, said external thread having a flat crest and a flat root, a runner nut mounted on said member adjacent to said end wall and having a mating thread engaging the external thread for movement from said end wall to progressively contract the diverging jaws inwardly as it is rotatively tightened, said end wall of said member being a heavy one having an external opening and a non-circular socket in it, and an anvil key received through said external opening with its wall in predetermined radially spaced relation from said internal thread and having a non-circular and mating non-rotatively with said socket in the end wall for simultaneous rotation therewith.

Claim 18

A tool for clamping and rotating a pipe nipple comprising a tumbler-shaped member having an end wall and its sides externally and internally threaded and longitudinally split into quadrants that provide slightly diverging free-ended jaws extending from the end wall, said internal thread having a high sharp crest to engage the roots of a standard pipe thread with a divergence taper appreciably greater than that of a pipe thread, said external thread having a flat crest and a flat root, a runner nut mounted on said member adjacent to said end wall and having a mating thread engaging the external thread for movement from said end wall to progressively contract the diverging jaws inwardly as it is rotatively tightened, said end wall of said member being a heavy one having an external opening and a non-circular socket in it, and an anvil key received through said external opening with its wall in predetermined radially spaced relation from said internal thread and having a non-circular and mating non-rotatively with said socket in the end wall for simultaneous rotation therewith.

Claim 19

A tumbler-shaped member having a heavy end wall with a noncircular socket and a central opening through it and longitudinally segmented slightly diverging free-ended jaws having internal and external threads, said internal thread having high sharp crest edges to engage the roots of a standard pipe thread with the divergence of the jaws appreciably greater than the taper of a standard pipe thread so that they can be easily advanced to cover the length of a standard pipe thread and the external thread being an easy running thread, running nut means on said external thread for progressively driving the diverging jaws inwardly under a contractive force as it is advanced towards the free ends of the jaws to drive said sharp edges into metal-to-metal engagement under pressure with the root of a standard pipe thread, and a headed anvil key means for closely fitting the inside wall of a pipe having said standard pipe thread externally thereon and receivable through the central opening with a non-circular head non-rotatively mating with said socket in the end wall for simultaneous rotation therewith.

Claim 20

A tumbler-shaped member having a heavy end wall with a noncircular socket and a central opening through it and longitudinally segmented slightly diverging free-ended jaws having internal and external threads, said internal thread having high sharp crest edges to engage the roots of a standard pipe thread with the divergence of the jaws appreciably greater than the taper of a standard pipe thread so that they can be easily advanced to cover the length of a standard pipe thread and the external thread being an easy running thread, running nut means on said external thread for progressively driving the diverging jaws inwardly under a contractive force as it is advanced towards the free ends of the jaws to drive said sharp edges into metal-to-metal engagement under pressure with the root of a standard pipe thread, and a headed anvil key means for closely fitting the inside wall of a pipe having said standard pipe thread externally thereon and receivable through the central opening with a non-circular head non-rotatively mating with said socket in the end wall for simultaneous rotation therewith.

Claim 21

The combination called for in claim 12 in which said external running thread mates with the thread of the running nut means and both threads have mating flat roots and crests for transmitting said contractive force essentially in a directly radial direction between the threads.

Claim 22

The combination called for in claim 12 in which said anvil key has a tightening taper and longitudinal roughening whose major diameter size is large enough for them to engage the inner surface of a known pipe size with contact pressure when inserted with such a pipe having a major production tolerance diameter.