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.

Patents

  1. Advanced Patent Search
Publication numberUS2226078 A
Publication typeGrant
Publication dateDec 24, 1940
Filing dateSep 29, 1939
Priority dateSep 29, 1939
Publication numberUS 2226078 A, US 2226078A, US-A-2226078, US2226078 A, US2226078A
InventorsSpahn Hilbert C
Original AssigneeSpahn Hilbert C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Expanding mandrel
US 2226078 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 24, 1940. Q SPAHN 2,226,078

EXPANDING MANDREL Filed Spt. 29, 1939 Patented Dec. 24, 1940 EXPANDHTG REL C. Spahn, Kewanee, Ill.

Application September 29, i939, Serial No. 297,173

3 Claims.

This invention relates to mandrels and more particularly to an expanding mandrel especially designed for use by plumbers and others when threading or cutting thin tubes or pipes.

The object of the invention is to provide an expansible mandrel of simple and durable construction adapted to fit within a tube or pipe so as to prevent crushing or denting of the walls thereof when the pipe is clamped in a chuck or vice preparatory to threading the same.

A further object of the invention is to provide a mandrel comprising a plurality of springpressed expansible sections and an operating member extending longitudinally through said sections and provided with coacting tapered heads for forcing said sections laterally against the tension ci the spring into engagement with the inner walls of a pipe.

A still further object of the invention is generally to improve this class of devices so as to increase their utility, durability and efiiciency as well as to reduce the cost of manufacture.

In the accompanying drawing forming a part of this specification and in which similar numerals of reference indicate corresponding parts in all the gures of the drawing:

Figure l is a side elevation of an expanding mandrel embodying the present invention showing the same in position within a tube or pipe,

Figure 2 is a longitudinal sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a transverse sectional view taken on the line .i3- 53 of Figure l with the spring omitted for the sake of clearness,

Figure fl is an end elevation with the adjacent expanding head removed and showing the construction of the receiving socket for said head,

Figure 5 is a View looking at the tapered end of the forward expanding head,

Figure 6 is an end view illustrating a modified form of the invention, the outer expanding head being removed, and

Figure 'l is a transverse sectional view of the structure shown in Figure 6.

The improved expanding mandrel forming the subject-matter of the present invention comprises a supporting rod 5 cylindrical in cross section and. having one end thereof provided with a knurled nger-piece 6 and its other end reduced at 'l to form an extension 8 provided with threads, indicated at t.

Loosely mounted on the extension 8 are a piurality of expansible sections I0, preferably three in number as shown, and having their inner faces cut-away at li to accommodate the extension S3 (Cl. lll-107) and their outer faces formed with circumferential grooves I2 for the reception of coiled springs it. 'Ihe adjacent ends of the coiled springs I3 are provided with interengaging fastening loops It to prevent displacement of the springs and also to 5 permit the springs to be readily removed or replaced when desired. The springs i3 serve to normally and yieldably hold the inner faces i i of the expansible segments it in engagement with the extension d so as to permit the mandrel to be ragily inserted within a tube or pipe, indicated a E5.

The opposite ends or the sectional expanding members are provided with inwardly extending tapered sockets it and it having hexagonal walls` 15 it which engage correspondingly shaped walls i@ on suitable expanding heads, indicated at 2li and 2i. The expanding head 2d is provided with a threaded base for engagement with the threads Si on the extension il while the expanding head El is slidably mounted on the extension d, as shown. The head 2i is provided with a longitudinally disposed sleeve 22 which rits loosely around the supporting rod 5 with its outer end normally bearing against the nger-piece e so that, when said iinger-piece is rotated, the heads 2li and 2l by engagexnent with the angular walls it ofthe sockets it and ii will force the expansible sections iii laterally into clamping engagement with the inner wall of the pipe i5 and thus prevent crushing or bending of the pipe when the latter is clamped in a chuck or vise preparatory to threading said pipe. It will here be noted that the outer ends oi the expansible sections i@ are provided with substantially V-shaped guide notches 2S which receive the angular portions or ribs 2li oi? the adjacent expanding heads, said angular portions or ribs 24 being disposed at the junction of the angular walls of the expanding heads, as best shown in Figure 5 of the drawing.

Under normal conditions, the coiled springs i3 hold the expansible sections against the extension 8 of the supporting rod and in which position the outer surfaces of the expansible sections will be ush or smooth so as to permit the mandrel to be readily inserted in the adjacent end of the pipe i5. After the mandrel has been positioned within the pipe, the nger-piece 6 is rotated and by engagement with the adjacent end of the sleeve 22 forces the head 2i longitudinally of the ex- 50 tension 8 while at the same time the head 2li by engagement with the threads will be fed inwardly, thus expanding the segmental sections lil laterally against the tension of the spring i3 and into engagement with the inner wall of the pipe 55 or'tbe -'5,"`thereby permitting the pipe to be clamped between the jaws of a vice or chuck without danger of crushing the pipe. After the pipe has been threaded, cut or otherwise operated upon, the linger-.piece 6 is rotated in the reverse direction which releases the heads 20 and 2i from engagement with the tapered walls of the sockets I8 and Il, whereupon the springs I3 will contract said sections so as to permit the mandrel to be readily removed' from the pipe or tube.

In Figures 6 and 7 of the drawing, there is illustrated a modified form of the invention, in which the expansible portion of the mandrel is formed in six sections, indicated at 25, and the walls of the sockets for the reception of the expanding heads are provided with twelve angular faces, in-

dicated at 26, instead of six, the construction and operation of the mandrel being otherwise similar to that shown in Figure 1 of the drawing.

The mandrel is exceedingly simple in construction and easy to operateand will effectually retain the walls of relatively thin tubes and pipe sections in their original shape when threading said pipe sections without danger of crushing or denting the same.

It will, of course, be understood that the mandrels may be made in different sizes and shapes and provided with any desired number of expansible sections without departing from the spirit of the invention.

Having thus described the invention, what is claimed as new is:

1. A tool of the class described comprising a rod having one end thereof reduced to form a longitudinal extension provided with a threaded portion and a smooth portion, a sectional expanding member mounted on the rod and provided with oppositely disposed tapered sockets having angular walls, springs surrounding the sections of the expanding member, tapered expanding heads having angular Walls adapted to engage the angular walls of the adjacent sockets, one of said expanding heads having threaded engagement with the threads on the extension and the other head being loosely mounted on the smooth portion of said extension, a sleeve carried by the last-mentioned head and loosely fitting ci? i ,vw over the supporting rod, and a finger-piece on one end o1' said supporting rod and bearing against the sleeve.

2. A tool of the class described comprising a supporting md having one end thereof reduced to form a longitudinal extension, a portion of which is threaded and another portion thereof smooth, a'sectional expanding member mounted on the rod and provided withioppositely disposed tapered sockets having angular walls, there being substantially V-shaped notches foi-med in said sections at the Junction of the angular walls thereof, tapered expanding heads! having correspondingly angular walls fitting within the adjacent sockets, one of said expanding heads engaging the threads on the extension and the other loosely mounted on the smooth portion thereof, a sleeve forming a continuation of the last-mentioned head and loosely mounted on the supporting rod, there being ribs disposed at the junction of the angular walls of the expanding heads and adapted to fit within the V-shaped notches, and a nger-piece mounted on one end of the supporting rod and bearing against the adjacent end of the sleeve.

3. A tool of the class described comprising a supporting rod having one end thereof reduced to form a longitudinal extension, a portion of which is threaded and another portion thereof smooth, a sectional expansible member mounted on the rod and provided with oppositely disposed tapered sockets, there being circumferential grooves formed in said expanding member, springs fitted within said grooves for normally holding the section of the expanding member yieldably in engagement with the rod extension, tapered heads fitting within the adjacent sockets, one of said heads engaging the threads on the extension and the other being loosely mounted on the smooth portion of said extension, a sleeve extending longitudinally from the last-mentioned expanding head and loosely fitting over the supporting rod, and a finger-piece carried by one end of the supporting rod for actuating the heads to expand the sections of said member.

HILBERT C. SPAHN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2487504 *Dec 20, 1945Nov 8, 1949Yelkin Herman JClutch assembly tool
US2583880 *Jan 7, 1946Jan 29, 1952Gisholt Machine CoClamp
US2601419 *Nov 14, 1949Jun 24, 1952Spahn Hilbert CExpanding mandrel
US2612376 *Feb 2, 1946Sep 30, 1952Vinco CorpExpansion arbor
US2614636 *Apr 12, 1947Oct 21, 1952Prewitt Richard HRotor parachute
US2671263 *Jul 17, 1950Mar 9, 1954Hamilton Bert CExtractor tool for bearing bushings
US2672175 *Jun 3, 1952Mar 16, 1954Howard Russell BPipe expander
US2678218 *May 19, 1952May 11, 1954Oslund Charles HUniversal expansion chuck
US2737396 *Dec 22, 1952Mar 6, 1956Corning Glass WorksChuck assembly
US2750196 *Jun 11, 1953Jun 12, 1956Peczynski Stanley NInternal grip collet
US2819527 *Mar 7, 1955Jan 14, 1958Spurling Nelson EGun boresight
US2899741 *Nov 15, 1956Aug 18, 1959 dunkerley
US2943729 *May 18, 1956Jul 5, 1960Boeing CoContractable ram mandrels
US2987022 *Sep 26, 1956Jun 6, 1961Grinnell CorpCollapsible back-up ring
US3031995 *May 13, 1959May 1, 1962Taylor Jr William WPipe flanging jig
US3051059 *Jan 2, 1959Aug 28, 1962Riley Stoker CorpTube end milling machine
US3055093 *May 21, 1958Sep 25, 1962Bendix CorpSleeve puller
US3077916 *Aug 12, 1960Feb 19, 1963Vaughn Harold EExpander tool
US3108365 *Jul 18, 1960Oct 29, 1963Dankerley Arthur ATool for inserting bearing inserts
US3257108 *Jul 10, 1962Jun 21, 1966Firearm Accessories IncMounting of gun muzzle devices
US3276297 *Nov 27, 1964Oct 4, 1966Parks James MInternal wrench
US3419299 *Feb 14, 1955Dec 31, 1968Trico Products CorpWiper arm
US3434709 *Jan 4, 1968Mar 25, 1969Olin MathiesonPipe gripping and flaring apparatus
US3442161 *Dec 14, 1965May 6, 1969Moyse Norman ECeramic drill
US3742186 *Jul 19, 1971Jun 26, 1973Lockheed Aircraft CorpImprovement in a grappling device
US3761008 *Oct 21, 1971Sep 25, 1973Detroit Sales CoExpansion arbor
US3948592 *Jun 18, 1974Apr 6, 1976Zimmer AktiengesellschaftSpinning unit for melt spinning high polymers
US3986383 *Mar 26, 1975Oct 19, 1976Petteys Howard AExpander tool
US4104775 *Oct 12, 1976Aug 8, 1978Lawless Earl EExtraction tool
US4146968 *Sep 12, 1977Apr 3, 1979National Can CorporationInternal diameter gauge
US4186916 *Sep 18, 1978Feb 5, 1980Salisbury Special ToolPrecision workpiece positioning means for machine tools
US4231507 *Jan 9, 1979Nov 4, 1980The United States Of America As Represented By The United States Department Of EnergyHigh-temperature, high-pressure bonding of nested tubular metallic components
US4283826 *Mar 8, 1979Aug 18, 1981Carrier CorporationTube extracting mechanism
US4330943 *Dec 23, 1980May 25, 1982Lazzari S.P.A.Testing device for passing inside caliper gauges through pipes and the like
US4355450 *Jun 1, 1981Oct 26, 1982Carrier CorporationMethod of operating a tube extracting mechanism
US4529184 *Jan 7, 1983Jul 16, 1985Gaston A. VandermeersscheTest specimen holder
US4685662 *Feb 28, 1986Aug 11, 1987Vaughn Millard APipe alignment apparatus
US4701989 *Aug 1, 1986Oct 27, 1987Cayzer Ian SPipe and flange alignment tool
US4712720 *Mar 11, 1986Dec 15, 1987Klaus TeschDevice for mutually centering and clamping two pipe bodies to be welded to one another
US4958720 *May 22, 1989Sep 25, 1990The Laitram CorporationScrew conveyor coupling apparatus
US5004095 *May 9, 1989Apr 2, 1991The Laitram CorporationApparatus for use in variable operating temperatures
US5004096 *Apr 3, 1989Apr 2, 1991The Laitram CorporationScrew conveyor coupling apparatus
US5022155 *Dec 4, 1989Jun 11, 1991Continuous Hose Co.Hose trimming apparatus
US5210949 *Dec 31, 1990May 18, 1993Sandroid Systems, Inc.Hose trimming apparatus
US5390683 *Feb 21, 1992Feb 21, 1995Pisharodi; MadhavanSpinal implantation methods utilizing a middle expandable implant
US5690007 *Mar 12, 1996Nov 25, 1997The Pillsbury CompanyCutting apparatus for obtaining a specimen of a food product container
US5693100 *Mar 15, 1996Dec 2, 1997Pisharodi; MadhavanMiddle expandable intervertebral disk implant
US5765821 *Oct 16, 1996Jun 16, 1998Janisse; EricPortable bicycle repair stand
US5943891 *Nov 24, 1997Aug 31, 1999Sango Co., Ltd.Silencer shell forming apparatus
US6186692Nov 20, 1998Feb 13, 2001Hwh CorporationLocking mechanism for expandable rooms
US6371469Jun 6, 2000Apr 16, 2002David T. GrayExpandable mandrel
US8371191 *Feb 12, 2013New Way Tools Co., Ltd.Wrenching device
US8511133 *Nov 27, 2012Aug 20, 2013Jun Fan ChenExpander for tubular elements
US20070266567 *Aug 6, 2007Nov 22, 2007Michael GraybealPipe Cutting Apparatus and Method
US20090038158 *Jan 3, 2008Feb 12, 2009Michael GraybealPipe cutting apparatus and method
US20110132154 *Nov 3, 2010Jun 9, 2011Ping-Wen HuangWrenching Device
US20150035215 *Aug 5, 2013Feb 5, 2015Jon BaklundFixture system
CN102059752A *Aug 25, 2010May 18, 2011中国西电电气股份有限公司Cutting and grinding clamp of large-scale porcelain bushing
CN102059752BAug 25, 2010Oct 2, 2013中国西电电气股份有限公司Cutting and grinding clamp of large-scale porcelain bushing
EP0845311A1 *Nov 27, 1997Jun 3, 1998Sango Co., Ltd.Silencer shell forming apparatus
EP1911550A2 *Oct 9, 2007Apr 16, 2008Klann Spezial-Werkzeugbau GmbHDevice for centring a coupling disc of a motor vehicle clutch
WO2012023060A1 *Jun 21, 2011Feb 23, 2012Adomavicius LinasTool designed for restoration / repair of formwork props, and its usage
Classifications
U.S. Classification279/2.15, 29/280, 408/241.00R, 81/445, 408/80, 82/169, 33/544, 269/48.1, 403/297
International ClassificationB23B31/00, B23B31/40
Cooperative ClassificationB23B31/404
European ClassificationB23B31/40C