US 5,815,926 A · Internal pipe cutter

Abstract

A new Internal Pipe Cutter for providing a cutting tool designed for cutting the wall of a pipe from inside the pipe through an opening at one end of the pipe. The inventive device includes an elongated shaft having an upper end adapted for connection to a rotational power tool and a lower end to which a rotary cutting blade may be perpendicularly attached. A set collar is slidably mounted on and adjustably positioned along the shaft. A gripping sleeve is disposed around the set collar and is slidably and rotatably mounted on the shaft whereby the gripping sleeve and the set collar are conjointly positionable along the shaft and whereby the shaft and the set collar conjointly rotate independent of the gripping sleeve. The gripping sleeve includes a guide flange at a lower end thereof wherein the guide flange abuts the open end of the pipe as the rotary cutting blade is circled within the inside of the pipe. Accordingly, the set collar is locked on the shaft such that when the guide flange abuts the open end of the pipe, the rotary cutting blade will be at a desired level.

Claims20

Dependent claims

A pipe cutter for use in cutting a pipe having a perimeter pipe wall and an open end formed by a perimeter edge of the perimeter pipe wall, comprising:

an elongated shaft having an upper end and a lower end, said upper end adapted for connection to a rotational power tool;
a rotary cutting blade removably attached to said lower end of said shaft;
a set collar slidably mounted on and adjustably positioned along said shaft;
a gripping sleeve disposed around said set collar, said gripping sleeve having an upper end and a lower end, said gripping sleeve slidably and rotatably mounted on said shaft whereby said gripping sleeve and said set collar are conjointly positionable along said shaft and whereby said shaft and said set collar conjointly rotate independent of said gripping sleeve,
said gripping sleeve including a guide flange projecting radially outward from said lower end thereof, said guide flange abutting said open end of said pipe as said rotary cutting blade is circled within said pipe;
wherein said guide flange has an outer perimeter edge forming the radially widest part of the gripping sleeve, and wherein said guide flange has a substantially planar lower surface extending radially outward from said elongated shaft to the outer perimeter edge of said guide flange to present a substantially flat surface across the lower surface of said guide flange for abutting against the perimeter edge of the perimeter pipe wall.

3 more elements

A pipe cutter for use in cutting a pipe having an open end, comprising:

an elongated shaft having an upper end and a lower end, said upper end adapted for connection to a rotational power tool;
a rotary cutting blade removably attached to said lower end of said shaft;
a set collar slidably mounted on and adjustably positioned along said shaft, said set collar including a set screw threadingly mounted therein, said set screw locking said set collar in a particular position along said shaft;
a gripping sleeve having an upper end and a lower end, said gripping sleeve disposed around said set collar and having a hole through one side thereof, said hole permitting access to said set screw,
said gripping sleeve slidably and rotatably mounted on said shaft whereby said gripping sleeve and said set collar are conjointly positionable along said shaft and whereby said shaft and said set collar conjointly rotate independent of said gripping sleeve,
said gripping sleeve including a guide flange projecting radially outward from said lower end thereof, said guide flange abutting said open end of said pipe as said rotary cutting blade is circled within said pipe.

3 more elements

A pipe cutter for use in cutting a pipe having an open end, comprising:

an elongated shaft having an upper end and a lower end, said upper end adapted for connection to a rotational power tool;
a rotary cutting blade removably attached to said lower end of said shaft;
a set collar slidably mounted on and adjustably positioned along said shaft;
a gripping sleeve disposed around said set collar, said gripping sleeve having an upper end and a lower end, said gripping sleeve slidably and rotatably mounted on said shaft whereby said gripping sleeve and said set collar are conjointly positionable along said shaft and whereby said shaft and said set collar conjointly rotate independent of said gripping sleeve;
said gripping sleeve including a guide flange projecting radially outward from said lower end thereof, said guide flange abutting said open end of said pipe as said rotary cutting blade is circled within said pipe;
an upper bearing rotatably mounting said upper end of said gripping sleeve on said shaft, and
a lower bearing rotatably mounting said lower end of said gripping sleeve on said shaft,
said upper bearing and said lower bearing each including an inner race and an outer race, said inner race sized for slidably receiving said shaft and said outer race sized for fitting within said gripping sleeve, said outer race secured within said gripping sleeve, and wherein
said set collar is positioned between said upper bearing and said lower bearing in abutting engagement therewith.

6 more elements

Dependencies are inferred from the claim text.

Internal pipe cutter

Life of this patent

Internal pipe cutter

Life of this patent

Abstract

Claims20