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US3883950A Expired / Lapsed US ⏱️ 0.0 years remaining

Inside pipecutter

Assignee: Individual
•
Filing: 1973-06-28
•
Granted: 1975-05-20
•
Expires: 1993-06-28
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Abstract

Abstract An inside pipecutter for cutting plastic pipe encased in concrete such as a drain pipe extending through a concrete floor including a rotatable mandrel having a plurality of radially movable cutters mounted therein and having an axially movable wedge for moving such cutters radially outwardly as the mandrel is rotated. The apparatus also includes a guide means for setting the depth of the cut-off of the pipe relative to the upper surface of the concrete floor through which the pipe extends.

Inventors

  • 👤 Arthur L Kurtz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 14:38
CPC Classifications
B; B23; B23D; B23D21/00; B23D21/14

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 198 words
An inside pipecutter for cutting off plastic pipe encased in concrete at some desired elevation above or below the upper surface of the concrete comprising: a. a rotatable mandrel adapted to be inserted into the upper open end of a section of plastic pipe embedded in concrete and protruding above the upper surface of such concrete; b. guide means for supporting said rotatable mandrel adjacent its upper end with its lower end in the pipe, said guide means including a plurality of adjustable legs for supporting said mandrel at a desired elevation relative to the upper surface of the concrete; c. cutter means carried by said rotatable mandrel and movable radially outwardly beyond the outer circumference of said mandrel and into engagement with the inner surface of the plastic pipe for cutting same; d. means for rotating said mandrel; e. drive means for urging said cutter means radially outwardly for cutting the pipe upon rotation of said mandrel, said drive means including a wedge shaped drive means; and f. adjustable stop means in said mandrel for limiting downward movement of said wedge shaped drive means, said stop means being mounted for adjustment from the exterioR of said mandrel.
Claim 2
Dependent Claim 198 words
An inside pipecutter for cutting off plastic pipe encased in concrete at some desired elevation above or below the upper surface of the concrete comprising: a. a rotatable mandrel adapted to be inserted into the upper open end of a section of plastic pipe embedded in concrete and protruding above the upper surface of such concrete; b. guide means for supporting said rotatable mandrel adjacent its upper end with its lower end in the pipe, said guide means including a plurality of adjustable legs for supporting said mandrel at a desired elevation relative to the upper surface of the concrete; c. cutter means carried by said rotatable mandrel and movable radially outwardly beyond the outer circumference of said mandrel and into engagement with the inner surface of the plastic pipe for cutting same; d. means for rotating said mandrel; e. drive means for urging said cutter means radially outwardly for cutting the pipe upon rotation of said mandrel, said drive means including a wedge shaped drive means; and f. adjustable stop means in said mandrel for limiting downward movement of said wedge shaped drive means, said stop means being mounted for adjustment from the exterioR of said mandrel.
Claim 3
Dependent Claim 36 words
The invention of claim 1 wherein: said mandrel is a cylindrical member having a non-circular passage extending axially thereof and wherein said means for rotating said mandrel is a non-circular member carried in said non-circular passage.
Claim 4
Dependent Claim 25 words
The invention of claim 1 wherein: said mandrel has a pair of openings on opposite sides thereof through which said cutter means are radially movable.
Claim 5
Dependent Claim 35 words
The invention of claim 1 including: cutter carriage means and wherein said wedge shaped drive means includes a pair of inwardly and downwardly tapered surfaces for engaging corresponding tapered surfaces on said cutter carriage means.
Claim 6
Dependent Claim 38 words
The invention of claim 4 wherein: said inwardly and downwardly inclined surfaces on said wedged shaped drive means and said cutter carriage means include interlocking channel means connecting said cutter carriage means and said wedge shaped drive means.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-19 1978-11-18 1979-05-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-19 1982-11-18 1983-05-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-19 1986-11-18 1987-05-20 $7700.00 Window Closed / Lapsed

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