Pipe cutting and preping device

Claim 2

A pipe cutting and end preparing device capable of use in severely restricted spaces, comprising plural pairs of semicircular segments adapted to be assembled together to surround the pipe to be cut, said pairs of segments including pipe gripping means to be cammed into tightly gripping surrounding contact with the pipe, body segments to be assembled into a stationary collar encompassing the pipe gripping means and restrained against movement relative to the latter, and gear segments and carriage ring segments to be coupled together and assembled into a ring gear and carriage ring rotatable together about the collar and supported thereon, drive means for rotating the ring gear and carriage ring about the pipe and collar, a pipe cutting and end shaping tool carried by the carriage ring, means for automatically progressively advancing the tool in discrete steps toward the pipe axis during rotation of the gear and carriage ring to increase the depth of cut, the ring gear and carriage ring having diametric planes of separation between the segments thereof disposed in angularly off-set relation to each other, each carriage ring segment having removable locking pins axially paralleling the pipe axis extending through the respective carriage ring segment into both of the gear segments to hold them in assembled relation about the body segments and pipe, each of the gear segments having a pair of said locking pins extending thereinto which pass through both of the carriage ring segments whereby the carriage ring segments and gear segments are mutually held thereby against separation until said locking pins are manually removed along axial path, said pipe gripping means including a pair of semicircular collet sections and companion semicircular washer segments encircled by said body segments to surround the pipe and having cam surfaces abutting confronting camming surfaces on the body segments, a pair of externally threaded collet nut segments to bear against the washer segments and encircle the pipe, and said body segments having an internally threaded bore portion receiving said collet nut segments.

Claim 3

A pipe cutting and end preparing device as defined in claim 1, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at leasT one stationary feed pin in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advance the cutting tool through one step.

Claim 4

A pipe cutting and end preparing device as defined in claim 1, wherein the plane of separation defined by the ends of said carriage ring segments is perpendicular to the plane of separation defined by the ends of the ring gear segments.

Claim 5

A pipe cutting and end preparing device as defined in claim 1, including a pair of arcuate housing members adapted to form a supporting framework surrounding the pipe, the housing members collectively defining an opening to receive and support said collar, the housing members having first and second ends, the first ends being pivotally hinged together for movement between a closed position encircling the collar and an open position wherein the second ends thereof are spaced sufficiently apart to receive the collar and pipe therebetween, and an axially elongated locking pin paralleling the pipe axis at said second end and extending through aligned apertures therefor in adjacent end portions of said housing portion for locking the housing members in closed position surrounding the collar.

Claim 6

A pipe cutting and end preparing device as defined in claim 4, wherein the plane of separation defined by the ends of said carriage ring segments is perpendicular to the plane of separation defined by the ends of the ring gear segments and the adjacent ends of said housing members in closed position define a plane of separation which is angularly displaced from the plane of separation of said body segments.

Claim 7

A pipe cutting and end preparing device as defined in claim 4, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at least one stationary feed pin fixed on one of said housing members in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advance the cutting tool through one step.

Claim 8

A pipe cutting and end preparing device as defined in claim 6, wherein the plane of separation defined by the ends of said carriage ring segments is perpendicular to the plane of separation defined by the ends of the ring gear segments and the adjacent ends of said housing members in closed position define a plane of separation which is angularly displaced from the plane of separation of said body segments.

Claim 9

A pipe cutting and end preparing device as defined in claim 4, wherein one of said housing members supports a pinion gear meshing with said ring gear when the housing members are in closed position and a drive shaft coupled to the pinion gear to be removably coupled with and driven by the output shaft of a portable drive motor.

Claim 10

A pipe cutting and end preparing device as defined in claim 2, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at least one stationary feed pin fixed on one of said housing members in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advAnce the cutting tool through one step.

Claim 11

A pipe cutting and end preparing device as defined in claim 8, wherein the plane of separation defined by the ends of said carriage ring segments is perpendicular to the plane of separation defined by the ends of the ring gear segments and the adjacent ends of said housing members in closed position define a plane of separation which is angularly displaced from the plane of separation of said body segments.

Claim 12

A pipe cutting and end preparing device capable of use in severly restricted spaces, comprising plural pairs of semi-circular segments adapted to be assembled together to surround the pipe to be cut, said pairs of segments including pipe gripping means to be cammed into tightly gripping surrounding contact with the pipe, body segments to be assembled into a stationary collar encompassing the pipe gripping means and restrained against movement relative to the latter, and gear segments and carriage ring segments to be coupled together and assembled into a ring gear and carriage ring rotatable together about the collar and supported thereon, drive means for rotating the ring gear and carriage ring about the pipe and collar, a pipe cutting and end shaping tool carried by the carriage ring, means for automatically progressively advancing the tool in discrete steps toward the pipe axis during rotation of the gear and carriage ring to increase the depth of cut, the ring gear and carriage ring having diametric planes of separation between the segments thereof disposed in angularly off-set relation to each other and having removable locking pins axially paralleling the pipe axis extending through the carriage ring segments into the gear segments to hold them in assembled relation about the body segments and pipe, each of the gear segments having a pair of said locking pins extending thereinto which pass through both of the carriage ring segments whereby the carriage ring segments and gear segments are mutually held thereby against separation until said locking pins are manually removed along axial paths, said pipe gripping means including a pair of semicircular collet segments of triangular cross-section and a pair of semi-circular washer segments to collectively encompass the pipe, a pair of externally threaded collet nut segments to bear against the washer segments and encircle the pipe, and said body segments forming said collar having an internally threaded bore portion receiving said collet nut segment and a truncated conical bore portion bearing against said collet segments to force the collet segments to grip the pipe responsive to rotation of the assembled collet nut segments against the assembled washer segments.

Claim 13

A pipe cutting and end preparing device capable of use in severly restricted spaces, comprising plural pairs of semi-circular segments adapted to be assembled together to surround the pipe to be cut, said pairs of segments including pipe gripping means to be cammed into tightly gripping surrounding contact with the pipe, body segments to be assembled into a stationary collar encompassing the pipe gripping means and restrained against movement relative to the latter, and gear segments and carriage ring segments to be coupled together and assembled into a ring gear and carriage ring rotatable together about the collar and supported thereon, drive means for rotating the ring gear and carriage ring about the pipe and collar, a pipe cutting and end shaping tool carried by the carriage ring, means for automatically progressively advancing the tool in discrete steps toward the pipe axis during rotation of the gear and carriage ring to increase the depth of cut, the ring gear and carriage ring having diametric planes of separation between the segments thereof disposed in angularly off-set relation to each other and having removable locking pins axially paralleling the pipe axis extending through the carriage ring segments into the gear segments to hold them in assembled relation about the body segments and pipe, each of the gear segments having a pair of said locking pins extending thereinto which pass through both of the carriage ring segments whereby the carriage ring segments and gear segments are mutually held thereby against separation until said locking pins are manually removed along axial paths, said pipe gripping means including a pair of semicircular collet segments of triangular cross-section and a pair of semi-circular washer segments to collectively encompass the pipe, a pair of externally threaded collet nut segments to bear against the washer segments and encircle the pipe, and said body segments forming said collar having an internally threaded bore portion receiving said collet nut segment and a truncated conical bore portion bearing against said collet segments to force the collet segments to grip the pipe responsive to rotation of the assembled collet nut segments against the assembled washer segments.

Claim 14

A pipe cutting and end preparing device as defined in claim 11, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at least one stationary feed pin in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advance the cutting tool through one step.

Claim 15

A pipe cutting and end preparing device as defined in claim 12, including a pair of arcuate housing members adapted to form a supporting framework surrounding the pipe, the housing members collectively defining an opening to receive and support said collar, the housing members having first and second ends, the first ends being pivotally hinged together for movement between a closed position encircling the collar and an open position wherein the second ends thereof are spaced sufficiently apart to receive the collar and pipe therebetween, and locking means at said second ends for locking the housing members in closed position surrounding the collar.

Claim 16

A pipe cutting and end preparing device as defined in claim 11, including a pair of arcuate housing members adapted to form a supporting framework surrounding the pipe, the housing members collectively defining an opening to receive and support said collar, the housing members having first and second ends, the first ends being pivotally hinged together for movement between a closed position encircling the collar and an open position wherein the second ends thereof are spaced sufficiently apart to receive the collar and pipe therebetween, and locking means at said second ends for locking the housing members in closed position surrounding the collar.

Claim 17

A pipe cutting and end preparing device as defined in claim 14, wherein one of said housing members supports a pinion gear meshing with said ring gear when the housing members are in closed position and a drive shaft coupled to the pinion gear to be removable coupled with and driven by the output shaft of a portable drive motor.

Claim 18

A pipe cutting and end preparing device as defined in claim 14, wherein the plane of separation defined by the ends of said carriage ring segments is perpendicular to the plane of separation defined by the ends of the ring gear segments and the adjacent ends of said housing members in closed position define a plane of separation which is angularly displaced from the plane of separation of said body segments.

Claim 19

A pipe cutting and end preparing device capable of use in severely restricted spaces, comprising a pair of arcuate housing sections pivotally connected together at one end of the sections for movement between open and closed positions and defining an encircling surround about the pipe to be cut having a circular housing opening when in closed position, a pair of semi-circular annular body segments forming a segmented collar to be fitted together about the pipe as an axis and mounted in the housing opening and having a central body opening for the pipe, a pair of semi-circular collet segments and companion semi-circular washer segments removably fitted in said central body opening to surround the pipe and having cam surfaces abutting confronting camming surfaces on the body segments, a pair of semi-circular threaded collet nut segments threaded in said central body opening in surrounding relation to the pipe to force said washer and collet segments against said camming surfaces and cam the collet into tightly gripping relation to the pipe exterior surface, a pair of semi-circular ring gear segments assembled in surrounding relation to the assembled body segments to rotate about the latter, a pair of semi-circular carriage ring segments to be assembled into a carriage ring about the pipe and a portion of the body segments to rotate about the latter, means releasibly connecting said carriage ring to said gear segments to be rotated by the latter, drive means for rotating the ring gear formed by the assembled gear segments, a pipe cutting and shaping tool carried by the carriage ring to progressively cut the pipe and shape the cut end upon rotation of the carriage ring and gear about the pipe as an axis, means for automatically progressively advancing the tool in increments toward the pipe axis during rotation of the carriage ring to increase the depth of cut, the ring gear and carriage ring having diametric planes of separation between the segments thereof disposed in angularly off-set relation to each other and having removable locking pins axially paralleling the pipe axis extending through the carriage ring segments into the gear segments to hold them in assembled relation about the body segments and pipe, each of the gear segments having a pair of said locking pins extending thereinto which pass through both of the carriage ring segments whereby the carriage ring segments and gear segments are mutually held thereby against separation until sAid locking pins are manually removed along axial paths.

Claim 20

A pipe cutting and end preparing device capable of use in severely restricted spaces, comprising a pair of arcuate housing sections pivotally connected together at one end of the sections for movement between open and closed positions and defining an encircling surround about the pipe to be cut having a circular housing opening when in closed position, a pair of semi-circular annular body segments forming a segmented collar to be fitted together about the pipe as an axis and mounted in the housing opening and having a central body opening for the pipe, a pair of semi-circular collet segments and companion semi-circular washer segments removably fitted in said central body opening to surround the pipe and having cam surfaces abutting confronting camming surfaces on the body segments, a pair of semi-circular threaded collet nut segments threaded in said central body opening in surrounding relation to the pipe to force said washer and collet segments against said camming surfaces and cam the collet into tightly gripping relation to the pipe exterior surface, a pair of semi-circular ring gear segments assembled in surrounding relation to the assembled body segments to rotate about the latter, a pair of semi-circular carriage ring segments to be assembled into a carriage ring about the pipe and a portion of the body segments to rotate about the latter, means releasibly connecting said carriage ring to said gear segments to be rotated by the latter, drive means for rotating the ring gear formed by the assembled gear segments, a pipe cutting and shaping tool carried by the carriage ring to progressively cut the pipe and shape the cut end upon rotation of the carriage ring and gear about the pipe as an axis, means for automatically progressively advancing the tool in increments toward the pipe axis during rotation of the carriage ring to increase the depth of cut, the ring gear and carriage ring having diametric planes of separation between the segments thereof disposed in angularly off-set relation to each other and having removable locking pins axially paralleling the pipe axis extending through the carriage ring segments into the gear segments to hold them in assembled relation about the body segments and pipe, each of the gear segments having a pair of said locking pins extending thereinto which pass through both of the carriage ring segments whereby the carriage ring segments and gear segments are mutually held thereby against separation until sAid locking pins are manually removed along axial paths.

Claim 21

A pipe cutting and end preparing device as defined in claim 17, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at least one stationary feed pin in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advance the cutting tool through one step.

Claim 22

A pipe cutting and end preparing device as defined in claim 17, wherein one of said housing members supports a pinion gear meshing with said ring gear when the housing members are in closed position and a drive shaft coupled to the pinion gear to be removably coupled with and driven by the output shaft of a portable drive motor.

Claim 23

A pipe cutting and end preparing device as defined in claim 19, wherein said means for automatically progressively advancing the tool includes a cutting tool holder slidably mounted on the carriage ring for radial reciprocative movement and supporting the cutting tool, a feed screw for reciprocating said tool holder, a worm and worm gear assembly coupled to the feed screw and to an indexing wheel extending beyond the perimeter of the ring gear and carried in a circular path about the pipe axis during rotation of the ring gear and carriage ring, and at least one stationary feed pin in said circular path of movement of the indexing wheel to intercept and rotate the latter through a selected increment for driving the feed screw to advance the cutting tool through one step.