US 3,977,076 A · Internal pipe cutting tool

Abstract

An internal pipe cutting tool to be inserted in an end opening of a pipe to be cut from the inside out has an outer elongated hollow support member with an adjustable support collar at one end to adjust the length of the pipe to be cut by the pipe cutting tool, and a cam member at the opposite end having a cam face of predetermined shape. An inner drive member lies in the longitudinal center line of the outer support member and projects at one end to the exterior thereof for receiving a driving tool on said exterior end and at the opposite end is threadably connected through the cam member so that a support and guide member outboard thereof will provide means for pivotally connecting the cutting jaws of a cutting jaw assembly disposed in assembled position to coact with the cam surface of said cam member. When the outer support member is turned clockwise the cam member is caused to expand the cutting jaws of the cutting jaw assembly into cutting position with the inner wall of the pipe to be cut and the inner drive member drives the expanded cutting jaws of the cutting jaw assembly, so that as the cutting jaw assembly is progressively expanded by clockwise movement of the outer support member the cutting jaws will progressively cut through the pipe to be cut from the inside wall out.

Claims10

Dependent claims

An internal pipe cutting tool for cutting pipe from the inner wall out comprising:

a. an elongated support member having, an adjustable support collar to adjust the cutting length of said internal pipe cutting tool,
b. cam means connected to the end of the support member remote from the adjustable collar, and a cam surface means formed on the outer face of said cam means,
c. a drive member rotatably mounted on said support member and rotatable from a point exterior of the support member at one end and having the other end disposed adjacent the cam means,
d. support and guide means connected to the end of the drive member adjacent the cam means,
e. a plurality of operatively associated cutting jaws each pivotally connected at a medial point thereon to the support and guide means, cutting means on the outboard end of each said cutting jaws, and said cutting jaws disposed in normally closed position,
f. said support member rotatable in one direction to bring the cam means into engagement with the cutting jaws for opening the same and in the other direction to permit the cutting jaws to return to their normally closed position whereby the cutting means on the outboard end of the cutting jaws will be brought into and out of cutting engagement with the inner wall of the pipe to be cut, and
g. said drive member for rotating the cutting jaw assembly as the cutting means thereon is brought into progressive incremental engagement with the inner wall of the pipe for cutting the pipe to the desired length.

4 more elements

An internal pipe cutting tool for cutting pipe from the inner wall out comprising:

a. an elongated support member having an adjustable support collar to adjust the cutting length of said internal pipe cutting tool,
b. cam means connected to the end of the support member remote from the adjustable collar, and cam surface means formed on the outer face of said cam means,
c. a drive member disposed along the longitudinal line of said support member and connected for relative movement between said support member and said drive member from a point exterior to the pipe being cut and one end of the drive member being disposed adjacent the cam means,
d. support and guide means connected to the end of the drive member adjacent the cam means,
e. a cutting jaw assembly having a plurality of operatively associated cutting jaws each pivotally connected at a medial point thereon to the support and guide means and disposed normally in closed position.
f. cutting head means on each of said cutting jaws outboard of said pivotal connection on the support and guide means;
and cam follower means on each of said cutting jaws formed on the inboard side of said pivotal connection,
g. said support member rotatable in one direction to bring the cam means into engagement with the cam follower means on said cutting jaws for opening the same and in the other direction to permit the cutting jaws to return to their normally closed position whereby the cutting head means on the outboard end of the cutting jaws will be brought into and out of cutting engagement with the inner wall of the pipe to be cut, and
h. said drive member for rotating the cutting jaw assembly as the cutting head means thereon is brought into progressive incremental engagement with the inner wall of the pipe for cutting the pipe to the desired length.

6 more elements

Dependencies are inferred from the claim text.

Internal pipe cutting tool

Life of this patent

Internal pipe cutting tool

Life of this patent

Abstract

Claims10