Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1772710 A
Publication typeGrant
Publication dateAug 12, 1930
Filing dateJun 1, 1928
Priority dateJun 1, 1928
Publication numberUS 1772710 A, US 1772710A, US-A-1772710, US1772710 A, US1772710A
InventorsDenney Harvey J
Original AssigneeDenney Harvey J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Inside pipe cutter
US 1772710 A
Previous page
Next page
Description  (OCR text may contain errors)

' Aug. 12, 1930.

H. J. DENNE'Y INS IDE PIPE CUTTER Filed June 1928 Patented Aug; {12, j

INSIDEQPIPE cuisine "I n I Application flled-llliine 1,

This inventionlrelatesto new andfuseful,

improvements inaninside pipe cutter.

One object of the invention is to provide a pipe cutter embodyin a body, havingacyl-' inder therein, with radially movable cutters mounted in bearings in the bodyand aImandrel fitted in said cylinder and operatively I connected with the cutters and operative to project the cutters outwardly into cutting po-v m sition or to withdraw said cutters,'said mandrel being operable in onedirection by a yieldable member to withdraw 'the'cutters and in,

another direction :byfluid pressure beneath the mandrel toactuate the cuttersoutwardly 5 into. cutting relation with the. pipe tobe severed. I

' Anotherobject of the invention is provide', in a pipe'cutter', amandrel, which is fitted in the cylinder of the body and issup- :wzoj ported thereby substantially throughoutiits length.

The cutter isparticularly 'adaptedtobe used for cutting and removing pipe stuck in a well bore. e L With the above and other objects in view the invention has particular relationto certain novel features of construction", operation and arrangement. of parts, an-exam le of which is given in this specification an illus- 1'30 trated in theaccornpanying dra'WingS, whereof thecutter. Figure 2 shows a cross sectional'view taken on the line 22 of Figure 1.

Figure 3 shows a crosslsectional view taken on the line 3-3 ofFigure 1, and

Figure 4 showsa side view of a modified V type of cutter (which may beemployed. Referring now more particularly ,to the drawings, wherein likefnumerals of; reference designate similar parts in each of the figures the numeral -1 designatesthe cutter body, which is tubular'in form, having vthe inside, cylinder 2 with the radiating cutter'bearmgsreceive thecorresponding tenonsflQL.

Figure 1 shows a vertical sectional :view

upper end ofthe body there is" an operating. string :of fpipe fas Fitted in the cylinder, 7 there; is. an} elongated mandrel 5fwhose lower end is fitted-withsuitablecup rings as 6 which within this thimblej there :isthe i' coil spring 8 which is interposed betweenthe'outer 'end of'h the thimbleZ-andtheupperendof the mandrel. The end of the mandrel adjacent the 1 spring carries a :pin 9 which is surroundedrbysaid spring. The mandrel -is limited' in one;direcf-f tio 'n by saidspring and inthe otherjdirection by the inwardly extending'annular flange- 10 1 against which the lowerendpftlie plunger isjadaptedtto abut; i The inandrel hasthe external upwardly; converging-grooves l1 and the-bottomsof these grooveshavethe lengths wise idovetaileda tenons 12 There are the; ra dial cutters 13', in the bearings;;3,whoseinner ends'ehavethe dovetailed cor-tises l l which ,The body has the longitudinal channel'sl5 leading fromtheupperto the lower end there ofand arranged ar'ound the cylinder2k {There ,i Si ajguidekpoint- 16 threaded onto? the "lower end of the body having theinternal chamber,

l7 in which the'channels l5sterminate iThe 7 7 3;, radi'ally disposedtherein; i I

n so; titQcloselyin saidecylinderjand.whiehfform; 1 cin iefiect; aFplunger. screwed i'nto thenppee 7 s end of thecylinderthere isa thimblea l andf r vice may then be removed from the pipe.

As above stated, the mandrel 5 fits closely in the cylinder and is thus supported againstthe lateral strain due to cutting operations so that should one or more of the cutters 13 become broken the remaining cutter will effectively operate against the pipe to be cut. 7 While going intothe bore the fluid in the well will pass inwardly throu h the channels 18 and 20 so as to fill the string 4 thus preventing the string from being crushed by the outside fluid pressure and when withdrawing the device from the bore the fluid in the string 4 will be drained out through said channels 18 and 20. In case the channel20 becomes wornby the grit'and sand in the fluid until it is too large the plug 19may be removed and a newone substituted. The type of cutter designated by the numere! 13 and shown in Figure 4 may beemp'loyed if'desired- This cutter has a side notch 21 and if this type of cutter is used the Yes 11' should have side tenons to be re-1 ceived by said notches 21 to retain the cutters 13' in the bod 1.

As stated t e grooves'converge upwardly and their sides form lateral supports for the cutters thus reinforcing, or strengthening,

' the cutters while inoperation.

cylinder is attached, there being a fluid channel leading from within the string and ter-' minating in said chamber, a yieldable member normally resisting the upward movement of the mandrel and means in the stem attached to the upper end of the cylinder and enclosing said yieldable member and excluding the pressure fluid from the upper end of the mandrel.

In testimony whereof I have signed my name to this specification.


While I have shown what I'now consider I I the preferred forms of the invention it is obvious that mechanical chan esmay be made therein and equivalents substituted for the parts shown andI reserve thelright to make such changes and substitutions as may be found desirable within the scope of the appended claims. 7 a i r 'WhatI claim is:-- n

1. A device of the character described including a body having an axial cylinder thereinya mandrel inthe cylinder, cutters mountedin the bod and operatively con-i nected with the man rel, said mandrel being adapted to move said cutters radially as the mandrel is moved longitudinally, said device having a chamber beneath the mandrel, said body having a channel leading from the 7 upper end thereof and terminating in said amber, said chamber having anoutlet ort, a thimble anchored to the upper end 0 the pglygand a yieldable member enclosed by the le normally resisting the upward movement of the mandrel. V 2; A casing cutter having a cylinder and a pressure chamber at one end of the cylinder, a mandrel in the cylinder one end of which is exposedto the pressure of fluid in said chamber, a radially movable cutter opera- 7 tively connected with the mandrel, an operating string t'othe lower end of which the

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2940523 *Apr 1, 1957Jun 14, 1960Joy Mfg CoSelf-feeding casing mill
US3251306 *Oct 31, 1960May 17, 1966Plunk Rowe AWell pipe scraping and sealing device
US4706748 *Sep 10, 1986Nov 17, 1987Imd CorporationPipe scraping device
US4889197 *Jun 28, 1988Dec 26, 1989Norsk Hydro A.S.Hydraulic operated underreamer
US5014780 *May 3, 1990May 14, 1991Uvon SkipperLong distance section mill for pipe in a borehole
US5350015 *Jun 30, 1993Sep 27, 1994Hailey Charles DRotary downhole cutting tool
US6886633 *Oct 4, 2002May 3, 2005Security Dbs Nv/SaBore hole underreamer
US6929076Mar 13, 2003Aug 16, 2005Security Dbs Nv/SaBore hole underreamer having extendible cutting arms
US7401666Jun 8, 2005Jul 22, 2008Security Dbs Nv/SaReaming and stabilization tool and method for its use in a borehole
US7584811Jun 25, 2008Sep 8, 2009Security Dbs Nv/SaReaming and stabilization tool and method for its use in a borehole
US7658241Apr 19, 2005Feb 9, 2010Security Dbs Nv/SaUnderreaming and stabilizing tool and method for its use
US7882905Mar 28, 2008Feb 8, 2011Baker Hughes IncorporatedStabilizer and reamer system having extensible blades and bearing pads and method of using same
US7900717 *Dec 3, 2007Mar 8, 2011Baker Hughes IncorporatedExpandable reamers for earth boring applications
US7975783Aug 28, 2009Jul 12, 2011Halliburton Energy Services, Inc.Reaming and stabilization tool and method for its use in a borehole
US8028767Jan 28, 2009Oct 4, 2011Baker Hughes, IncorporatedExpandable stabilizer with roller reamer elements
US8205689May 1, 2009Jun 26, 2012Baker Hughes IncorporatedStabilizer and reamer system having extensible blades and bearing pads and method of using same
US8297381Jul 13, 2009Oct 30, 2012Baker Hughes IncorporatedStabilizer subs for use with expandable reamer apparatus, expandable reamer apparatus including stabilizer subs and related methods
US8657038Oct 29, 2012Feb 25, 2014Baker Hughes IncorporatedExpandable reamer apparatus including stabilizers
US8657039Dec 3, 2007Feb 25, 2014Baker Hughes IncorporatedRestriction element trap for use with an actuation element of a downhole apparatus and method of use
U.S. Classification166/55.8, 166/212, 175/269
International ClassificationE21B29/00
Cooperative ClassificationE21B29/005
European ClassificationE21B29/00R2