US3677684A - Apparatus for enlarging an extremity of a plastic pipe - Google Patents

Apparatus for enlarging an extremity of a plastic pipe Download PDF

Info

Publication number
US3677684A
US3677684A US3677684DA US3677684A US 3677684 A US3677684 A US 3677684A US 3677684D A US3677684D A US 3677684DA US 3677684 A US3677684 A US 3677684A
Authority
US
United States
Prior art keywords
expander
extremity
mandrel
jaws
spindle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Gerald M Platz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Millennium Petrochemicals Inc
Original Assignee
Millennium Petrochemicals Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Millennium Petrochemicals Inc filed Critical Millennium Petrochemicals Inc
Priority to US88490169A priority Critical
Application granted granted Critical
Publication of US3677684A publication Critical patent/US3677684A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/218Pipe machine: socket forming apparatus

Abstract

This invention is directed to apparatus for enlarging or belling an extremity of a plastic pipe so that the extremity of an adjacent length of pipe may be received and retained therein. An expanding mandrel is provided, and this mandrel includes expander jaws, expander wedges, and expander wedge guides which engage a tapered spindle. A continuous steel sheath surrounds the mandrel components and longitudinal movement of the tapered spindle provides progressive enlargement or reduction of the mandrel diameter.

Description

D United States Patent 1 3,677,684 Platz [451 July 18, 1972 [541 APPARATUS FOR ENLARGING AN 3,248,756 5/1966 Mills et a1. ..18/l9 TE EXTRENIITY OF A PLASTIC PIPE 729,099 5/1903 Smith ....18/l9 TE UX 2,943,667 7/1960 Ewing et 81.. ..18/4$ R UX 1 1 lnvemofl Gerald Plm, Champwsn, 3,373,460 3/1968 Ladney, Jr... .249/152 x [73] Assignee: National Distillers and Chemical corpora. 1,698,999 1/1929 Hothersall.... ...18/ 19 TB UX on, New York, N Y 1,625,131 4/1927 M11181 18/D1G. 5 1,705,843 3/1929 Walter ..72/392 [22] Filed: Dec. 15, 1969 Primary Examiner-J. Howard Flint, Jr. [2]] Appl' 884301 Attamey-Allen A. Meyer, Jr.

[52] US. Cl ..42$/393, 425/469 [57] ABSTRACT 32 5' This invention is directed to apparatus for enlarging or belling l 8 45 393 an extremity of a plastic pipe so that the extremity of an ad- 249 78480 1 g 2 I 3 3 5 K 28 jacent length of pipe may be received and retained therein. An expanding mandrel is provided, and this mandrel includes expander jaws, expander wedges, and expander wedge guides [56] References Cited which engage a tapered spindle. A continuous steel sheath sur- UNITED STATES PATENTS rounds the mandrel components and longitudinal movement of the tapered spindle provides progressive enlargement or 3,339,242 9/1967 Lamb ..l8/45 R X reduction f h mandrel diameten 2,672,175 3/1954 Howard ..18/19 TE UX 2,948,031 8/1960 Webb ..18/D1G. 5 6 Claim, 12 Drawing Figures 3 13 13a 23b 20 24 n 17d 1 w 16 2 3 230. i 21 11o. j 1;; 1 1e v fl i f 16a 1 I I A f 1 j w de 1.. l mu 2 23 23a "-'k' 14 f 3 l|e 17 l (IO Patented July 18, 1972 FIG.|

5 Sheets-Sheet 1 INVENTOR G E RA LD M P L ATZ ATTORNEY INVENTOR TTORNE Patented July 18, 1972 5 Sheets-Sheet 2 z M/ T ,l A l D. mm mm w G A R m Ir E G 9 9 Y 9 Patented July 18, 1972 v 5 Sheets-Sheet 5 INVENTOR GERAL'D M. PLATZ ATTORNEY Patented July 18, 1972 3,677,684

5 Sheets-Sheet 4 FIG.5

24 n l7d 25 INVENTOR GERALD M. PLATZ BY W,

ATTORNEY Patented July 18, 1972 3,677,684

5 Sheets-Sheet 5 ATTORYE'Y APPARATUS FOR ENLARGING AN EXTREMITY OF A PLASTIC PIPE This invention relates to apparatus for expanding or enlarging an extremity of a length of flexible tubing or pipe to permit the ready assembly of an adjacent length of such tubing or pipe. The piping or tubing with which we here are concerned may be produced by extrusion or related processes from such polyolefins as polyethylene, polypropylene, polybutene, and the like, and are well known in this art.

Difficulties have been experienced in connection with the joining together of adjacent lengths of such pipe or tubing and prior art practices which include the use of fusing operations, solvents, and adhesives, have proven unsatisfactory. One particularly efficient method for accomplishing the results desired is through the enlargement, as by a belling operation, of one extremity of a pipe length to an internal diameter complementary to the external diameter of the adjacent pipe length, which then may be received telescopically within said enlarged extremity.

Accordingly, it is a major object of the present invention to provide novel apparatus for the ready expansion or enlarge ment of an extremity of a flexible pipe produced from plastic material whereby the extremity of an adjacent pipe length may be received and retained therein with particular convenience.

It is a further object of the invention to provide a device of the class set forth which may be utilized with pipe lengths of varying interior diameters and will be adjustable from an inoperative to an operative position, to fit within a pipe length and then be expanded to enlarge the extremity of said pipe length to the diameter or extent required.

It is still a further object of the present invention to provide a novel method for joining adjacent lengths of flexible plastic pipe by enlarging or belling an extremity of one length of such pipe to an interior diameter complementary to the exterior diameter of the next adjacent length of pipe which then may be received and securely retained within said enlarged extremity.

Briefly stated, the invention comprises the utilization of an expanding mandrel including a plurality of jaws or segments which are slidably associated with a conical spindle, these jaws being surrounded by an encompassing spring steel sheath to provide a smooth peripheral surface. Lateral movement of the spindle in one direction with respect to the jaws will result in the opening of the jaws from a retracted to an operative position, thereby increasing the diameter of the spring steel sheath and enlarging the interior diameter of the extremity of a length of plastic pipe within which the mandrel has been positioned. It will be understood that the gap between adjacent segments or jaws will be increased in direct relationship to the extent of movement of the segments upon the spindle, and is a function of the number of jaws and/or the expansion ratio. However, these gaps are bridged by the spring steel sheath which increases in diameter as the jaws open and, at all times, provides a smooth and continuous peripheral surface which contacts the interior surface of the plastic pipe being enlarged.

Further objects and advantages of the invention will be readily apparent from the accompanying drawings and following description wherein:

FIG. 1 is a side elevational view of a novel pipe enlarging or expanding tool or apparatus constructed in accordance with the present invention;

FIG. 2 is a longitudinal sectional view, on an enlarged scale, taken on the line 2-2 of FIG. 3 through the novel expanding mandrel, parts being broken away, the adjustable jaws being in expanded or operative position;

FIG. 3 is a transverse sectional view through the expanding mandrel, taken on the line 33 of FIG. 1 and also illustrating the jaws in expanded position;

FIG. 4 is a transverse sectional view through the expanding mandrel, similar to FIG. 3 and illustrating the jaws in fully retracted position;

FIG. 5 is a side elevational view of the expanding mandrel and spindle in retracted or inoperative position illustrating, in section, the extremity of a length of plastic pipe positioned thereupon;

FIG. 6 is a side elevational view, similar to FIG. 6, and illustrating the spindle in operative position with the expanding mandrel enlarged and the interior diameter of the length of plastic pipe having been increased so as to be complementary to the exterior diameter of the adjacent pipe length to be connected thereto;

FIG. 7 is a side elevational view of the operative spindle per se;

FIG. 8 is a transverse sectional view through the expanding mandrel taken on the line 8-8 of H16. 2 and looking in the direction of the arrows;

FIG. 9 is a detail sectional view taken on the line 9--9 of FIG. 8;

FIG. 10 is a perspective view of an; expanding guide which provides operative association between each expanding wedge of the mandrel and the spindle;

FIG. 11 is a perspective view of the preferred form of expander wedge employed; and

FIG. 12 is a perspective view of one of the expander jaws.

As shown in the drawings, the novel apparatus of the present invention includes a stand or base portion 10 including a vertically disposed mounting plate 11, secured to standards or the like 12, a spindle supporting U-shaped bracket 13 being attached to one face of the mounting plate by any suitable means such as bolts or the like 13a.

An internally threaded adjusting element or hand wheel 14 having a hub portion 14a is rotatably received within a suitable aperture in the bracket 13 and a longitudinally disposed threaded adjusting rod 15 extends through said handwheel and projects through the mounting plate 11 which carries a tubular guide 11a through which the adjusting rod 15 passes. A conical and outwardly tapered spindle or expander 16 is mounted upon the reduced extremity 15a of the adjusting rod 15, the peripheral surface.of said spindle being provided with a plurality of uniformly spaced expander guide receiving slots 16a or cam surfaces (six such slots being illustrated) for a purpose to be described more fully hereafter. It will obvious that rotation of the handwheel 14 in one direction (clockwise) will advance the adjusting rod 15 and the spindle or expander 16 in a direction away from the mounting plate 11 and that rotation of the handwheel in the opposite direction (counterclockwise) will move the adjusting rod and the spindle toward the mounting plate 11.

The novel expanding mandrel of the present invention, as shown more particularly in FIGS. 2 through 6 of the drawings, is constituted by a plurality of expander jaws 17 and a similar number of expander wedges 18, each of said expander wedges being mounted upon the outer extremity of an expander wedge guide 19, the inner extremity of each wedge guide being received within a slot 16a provided in the peripheral surface of the spindle 16. These slots are uniformly spaced and provide an assembled relationship whereby the expander wedges are radially mounted upon said spindle, there being an expander wedge between adjacent expander jaws.

In the embodiment of the invention illustrated, six expander jaws 17 and an identical number of expander wedges and wedge guides are disclosed; however, a greater or lesser number can be utilized with equal facility, it being understood that the greater the number of jaws, the smaller the gap or span therebetween.

Each longitudinally disposed expander jaw 17 is preferably of substantially triangular cross-sectional configuration, including an arcuate outer wall surface 17a and angularly disposed converging inner wall surfaces 17b with a flattened base therebetween. The curvature or radius of the outer wall surface should be lesser than the minimum interior diameter of the plastic pipe to be worked upon whereby the expanding mandrel, when in retracted position, may be received readily within such plastic pipe. Desirably the outer arcuate surface of each expander jaw is stepped down from its inner end to its outer end, as shown at 17d, to assist in the insertion of the mandrel within a pipe extremity.

Each expander wedge 18 includes an arcuate outer longitudinal surface 18a, having a curvature complementary to that of the expander jaws, angularly disposed and diverging side walls 18b, the angular relationship thereof being complementary to that of the converging inner wall surfaces of the expander jaws, and a flattened base portion 180. Each expander wedge 18 is provided with a T-shaped longitudinally disposed and centrally located slot or keyway 18d which extends the full length thereof and within which the complementary T- shaped head 19a of a wedge guide 19 is received, the association being such that the wedge guides 19 may reciprocate freely within the slots 16a in the spindle 16 as the expanding mandrel is adjusted from retracted to expanded position and vice versa.

As shown more particularly in FIG. of the drawings, each expander wedge guide 19 is provided with a T-shaped head portion 19a and a tapered bottom edge 19b whereby the height of each wedge guide decreases from the inner to the outer end thereof, the rate of decrease being complementary to the taper of the spindle 16. Thus, when a wedge guide 19 is received with a slot 160, the outer surface of the wedge guide, and the expander wedge supported thereupon, will at all times lie in a plane parallel to the longitudinal axis of the spindle.

With the spindle, wedge guides, expander wedges, and expander jaws in assembled relationship as described hereabove, suitable means is provided for maintaining the assembly against inadvertent separation, and a preferred form of such means includes an inner flanged end cap mounted in fixed spaced relationship with respect to the standard 12 and an outer flanged end cap 21, which is mounted upon and movable with the reduced outer extremity of the expander 16, as shown more particularly in FIG. 2 of the drawings, the expander jaws 17 and expander wedges 18 being ofa length to fit snugly therebetween.

Desirably, the peripheral surfaces of the expander jaws, wedges and wedge guides are circumferentially notched or recessed adjacent each extremity for the reception of a continuous coil spring or the like 22 whereby the several elements are urged inwardly toward each other and the spindle upon which these components are supported.

As shown more particularly in FIG. 1 of the drawings, the mandrel assembly is mounted in fixed relationship with respect to the mounting plate 11, suitable securing means, such as bolts or the like 23, having one end attached to the inner end cap 20 as shown at 23a and the other end secured to the mounting plate 11 as shown at 23b being provided. It will be noted that the spacing between the expanding mandrel and the mounting plate 11 must be sufficiently great to receive that portion of the spindle which passes through the mandrel when the limit of expansion or enlargement will be approached.

To provide a more certain assembly between the expander wedges and wedge guides and the inner end cap 20, each wedge guide 19 terminates at its inner extremity in a vertically disposed T-shaped head portion 19c and the adjacent face or wall of the end cap 20 is provided with a plurality of radially spaced and complementary T-shaped slots 20a within which the head portions 190 of the wedge guides are received.

To provide a continuous and smooth peripheral surface for the expander jaws 17 which will be spread apart and thus have an increasing gap between adjacent jaws as the operative diameter of the mandrel is enlarged, a stainless steel spring sheath 24 is provided. This sheath, which will have a longitudinal dimension in accordance with the width of enlarged pipe extremity desired, viewed transversely, is spiral with welloverlapping edges and under continual inherent spring tension to urge the expander jaws into firm engagement with the expander wedges. As the diameter of the mandrel is enlarged, theoverlapping edges of the sheath will skip over each other to permit simultaneous enlargement of the sheath. In like manner, as the mandrel diameter is decreased, inherent spring tension or resiliency insures simultaneous reduction in sheath diameter.

This sheath, which is produced from particularly thin sheet material, bridges the gap between adjacent expander jaws and insures uniform enlargement of the extremity of the plastic pipe or tubing and, if desired, the floating end or both edges 24a of the sheath may be feathered or tapered to a knife edge to eliminate any line on the interior surface of the enlarged pipe extremity.

The method of operation of the apparatus discussed in detail hereabove is particularly simple and the steps required in connection therewith are detailed as follows.

It is necessary that the plastic pipe extremity to be enlarged be preheated to facilitate the expansion or enlargement thereof and a suitable heating chamber (not shown) is provided for such purposes. Such units are well-known in this and related arts and are available on the open market as closedloop circulating air blowers with electrical finned heating elements. Temperature elevation on the order of from 250 to 400 F. is adequate for present purposes. Temperatures on the order of 500 F. or higher may blister the plastic pipe and are to be avoided. It has been found in practice that with the heating chamber temperature controlled at 400 F. approximately 1 minute and 20 seconds is required to preheat an 8-inch diameter plastic sewer pipe to a temperature on the order of 250 F, this constituting a soft bell forming" condition.

The preheated plastic pipe extremity 25 is then placed upon the collapsed mandrel, as shown in FIG. 5 of the drawings. The spindle 16 is then moved toward the mounting plate 11, by means of rotation of the handwheel 14, thereby moving the wedge guides 19 outwardly as the upwardly inclined slot or cam tracks 16a slide beneath the bottom edges of said wedge guides. This results in the increase in diameter of the expanding mandrel and encompassing spring sheath, preferably produced from stainless steel with a highly polished exterior surface, with the resultant enlargement of the interior diameter of the plastic pipe to create the belled portion 25a. The expanded pipe extremity is then permitted to cool, the mandrel is closed by moving the spindle in a direction toward the interior of the pipe length and the expanded or belled pipe length, or sleeve, is slipped off or removed from the mandrel.

The degree of enlargement is readily controllable as by a gauge or other indicating media or stop means (not shown) on the apparatus and, in each instance, should be complementary to the exterior diameter of the pipe length to be received therein.

It has been found in practice that a thin sheath or sheet of stainless steel surrounding or encompassing the mandrel or enlarging die adequately bridges any unsupported sections or gaps between the expander jaws. The highly polished surface of this sheath forces the plastic material to slide or flow uniformly with respect to the specific locations of the expander jaws and produces equal enlargement or stretch around the entire surface of the belled extremity resulting in uniform interior and exterior surfaces of the belled portion without substantial gauge variation.

There has been described novel apparatus and method for the enlargement of an extremity of a length of plastic pipe which may be utilized with particular convenience and economy and which includes a novel expanding mandrel having wide-spread utility in the industrial arts.

It will be obvious to those skilled in this art that various changes may be made in the invention without departing from the spirit and scope thereof and reference therefore is had to the claims for summaries of the essentials of the invention and of the novel features of construction and novel combinations of parts, and method of operation, for all of which protection is desired.

What is claimed is:

1. An expanding mandrel assembly comprising, in combination, a plurality of radially disposed expander jaws and a plurality of expander wedges, said expander wedges being located alternately with respect to said expander jaws, each of said expander jaws including an arcuate outer wall surface and angularly disposed converging inner wall surfaces and each of said expander wedges including an arcuate outer wall surface having a radius complementary to that of the expander jaws and angularly disposed diverging side walls having an angular relationship complementary to that of the converging inner surfaces of the expander jaws;

a radially disposed wedge guide associated with each expander wedge, the base of each expander wedge being provided with a longitudinally disposed T-shaped slot for the reception of the complementarily conformed upper extremity of the associated wedge guide;

each of said expander jaws and expander wedges being provided with a circumferential notch adjacent at least one extremity thereof and a continuous coil spring received within said aligned circumferential notches to bias said expander jaws and wedges toward each other;

cam means located axially of said mandrel assembly and movable laterally to increase selectively the diameter of said mandrel, said cam means being constituted by a tapered spindle and each wedge guide having a complementarily tapered inner surface which engages said spindle, the peripheral surface of said spindle being provided with a plurality of longitudinally disposed and uniformly spaced wedge guide receiving slots within which the lower extremities of said wedge guides are slidably received; expansible spring means surrounding said mandrel assembly, said spring means being operative to urge said expander jaws and expander wedges inwardly toward a retracted position; and

inner and outer flanged end caps for said mandrel and spindle assembly, said inner end cap including a vertically disposed wall having a centrally located aperture to permit ready passage therethrough of the axially located cam means, said outer end cap being mounted upon the outer extremity of said cam means and engaging with the outer extremity of said mandrel assembly in surrounding relationship when said cam means approaches the limit of its movement in the expanding direction.

2. An expanding mandrel as set forth in claim 1 where the vertically disposed wall of the inner end cap is provided with a plurality of radially spaced T-shaped slots and the inner extremity of each wedge guide has a complementarily shaped vertical extremity receivable within an associated slot whereby said wedge guides are secured to said inner end cap.

3. Apparatus for enlarging an extremity of a length of a plastic pipe so that the extremity of an adjacent length of plastic pipe may be received and retained therein, said apparatus including a mounting plate, a bracket including an internally threaded handwheel mounted on one face of said mounting plate, and a horizontally disposed threaded adjusting rod extending through said bracket and mounting plate;

an expanding mandrel assembly comprising, in combination, a plurality of radially disposed expander jaws and a plurality of expander wedges, said expander wedges being located alternately with respect to said expander jaws, each of said expander jaws including an arcuate outer wall surface and angularly disposed converging inner wall surfaces and each of said expander wedges including an arcuate outer wall surface having a radius complementary to that of the expander jaws and angularly disposed diverging side walls having an angular relationship complementary to that of the converging inner surfaces of the expander jaws;

a radially disposed wedge guide associated with each expander wedge, the base of each expander wedge being provided with a longitudinally disposed T-shaped slot for the reception of the complementarily conformed upper extremity of the associated wedge guide;

each of said expander jaws and expander wedges being provided with a circumferential notch adjacent at least one extremity thereof and a continuous coil spring received within said aligned circumferential notches to bias said expander jaws and wedges toward each other;

cam means located axially of said mandrel assembly and movable laterally to increase selectively the diameter of said mandrel said cam means being constituted by a tapered spindle mounted upon the inner extremity of said threaded adjusting rod and each wedge guide having a complementarily tapered inner surface which engages said spindle, the peripheral surface of said spindle being provided with a plurality of longitudinally disposed and uniformly spaced wedge guide receiving slots within which the lower extremities of said wedge guides are slidably received; expansible spring means surrounding said mandrel assembly, said spring means being operative to urge said expander jaws and expander wedges inwardly toward a retracted position; and

inner and outer flanged end caps for said mandrel and spindle assembly, said inner end cap including a vertically disposed wall having a centrally located aperture to permit ready passage therethrough of the axially located cam means, said outer end cap being mounted upon the outer extremity of said cam means and engaging with the outer extremity of said mandrel assembly in surrounding relationship when said cam means approaches the limit of its movement in the expanding direction.

4. Apparatus as set forth in claim 3 where said adjustable mandrel includes an inner flanged end cap having a centrally located aperture through which the spindle extends, means being provided to secure said inner flanged end cap to said mounting plate in spaced relation with respect thereto the spacing between said mounting plate and inner end cap being sufficiently great to receive that portion of the spindle which passes through the mandrel when the limit of enlargement will be reached.

5. An expanding mandrel as set forth in claim 1 where the expansible spring means surrounding said mandrel assembly is a stainless steel spring sheath having overlapping edges and adjustable with said mandrel to provide a smooth peripheral surface for at least a portion of the length of said expander aws.

6. Apparatus for enlarging an extremity of a length of plastic pipe as set forth in claim 3 where the expansible spring means surrounding said mandrel assembly is a stainless steel spring sheath having overlapping edges and adjustable with said mandrel to provide a smooth peripheral surface for at least a portion of the length of said expander jaws.

Claims (6)

1. An expanding mandrel assembly comprising, in combination, a plurality of radially disposed expander jaws and a plurality of expander wedges, said expander wedges being located alternately with respect to said expander jaws, each of said expander jaws including an arcuate outer wall surface and angularly disposed converging inner wall surfaces and each of said expander wedges including an arcuate outer wall surface having a radius complementary to that of the expander jaws and angularly disposed diverging side walls having an angular relationship complementary to that of the converging inner surfaces of the expander jaws; a radially disposed wedge guide associated with each expander wedge, the base of each expander wedge being provided with a longitudinally disposed T-shaped slot for the reception of the complementarily conformed upper extremity of the associated wedge guide; each of said expander jaws and expander wedges being provided with a circumferential notch adjacent at least one extremity thereof and a continuous coil spring received within said aligned circumferential notches to bias said expander jaws and wedges toward each other; cam means located axially of said mandrel assembly and movable laterally to increase selectively the diameter of said mandrel, said cam means being constituted by a tapered spindle and each wedge guide having a complementarily tapered inner surface which engages said spindle, the peripheral surface of said spindle being provided with a plurality of longitudinally disposed and uniformly spaced wedge guide receiving slots within which the lower extremities of said wedge guides are slidably received; expansible spring means surrounding said mandrel assembly, said spring means being operative to urge said expander jaws and expander wedges inwardly toward a retracted position; and inner and outer flanged end caps for said mandrel and spindle assembly, said inner end cap including a vertically disposed wall having a centrally located aperture to permit ready passage therethrough of the axially located cam means, said outer end cap being mounted upon the outer extremity of said cam means and engaging with the oUter extremity of said mandrel assembly in surrounding relationship when said cam means approaches the limit of its movement in the expanding direction.
2. An expanding mandrel as set forth in claim 1 where the vertically disposed wall of the inner end cap is provided with a plurality of radially spaced T-shaped slots and the inner extremity of each wedge guide has a complementarily shaped vertical extremity receivable within an associated slot whereby said wedge guides are secured to said inner end cap.
3. Apparatus for enlarging an extremity of a length of a plastic pipe so that the extremity of an adjacent length of plastic pipe may be received and retained therein, said apparatus including a mounting plate, a bracket including an internally threaded handwheel mounted on one face of said mounting plate, and a horizontally disposed threaded adjusting rod extending through said bracket and mounting plate; an expanding mandrel assembly comprising, in combination, a plurality of radially disposed expander jaws and a plurality of expander wedges, said expander wedges being located alternately with respect to said expander jaws, each of said expander jaws including an arcuate outer wall surface and angularly disposed converging inner wall surfaces and each of said expander wedges including an arcuate outer wall surface having a radius complementary to that of the expander jaws and angularly disposed diverging side walls having an angular relationship complementary to that of the converging inner surfaces of the expander jaws; a radially disposed wedge guide associated with each expander wedge, the base of each expander wedge being provided with a longitudinally disposed T-shaped slot for the reception of the complementarily conformed upper extremity of the associated wedge guide; each of said expander jaws and expander wedges being provided with a circumferential notch adjacent at least one extremity thereof and a continuous coil spring received within said aligned circumferential notches to bias said expander jaws and wedges toward each other; cam means located axially of said mandrel assembly and movable laterally to increase selectively the diameter of said mandrel, said cam means being constituted by a tapered spindle mounted upon the inner extremity of said threaded adjusting rod and each wedge guide having a complementarily tapered inner surface which engages said spindle, the peripheral surface of said spindle being provided with a plurality of longitudinally disposed and uniformly spaced wedge guide receiving slots within which the lower extremities of said wedge guides are slidably received; expansible spring means surrounding said mandrel assembly, said spring means being operative to urge said expander jaws and expander wedges inwardly toward a retracted position; and inner and outer flanged end caps for said mandrel and spindle assembly, said inner end cap including a vertically disposed wall having a centrally located aperture to permit ready passage therethrough of the axially located cam means, said outer end cap being mounted upon the outer extremity of said cam means and engaging with the outer extremity of said mandrel assembly in surrounding relationship when said cam means approaches the limit of its movement in the expanding direction.
4. Apparatus as set forth in claim 3 where said adjustable mandrel includes an inner flanged end cap having a centrally located aperture through which the spindle extends, means being provided to secure said inner flanged end cap to said mounting plate in spaced relation with respect thereto the spacing between said mounting plate and inner end cap being sufficiently great to receive that portion of the spindle which passes through the mandrel when the limit of enlargement will be reached.
5. An expanding mandrel as set forth in claim 1 where the expansible spring means surrounding said mandrel assembly is a stainless steel spring sheath having overlapping edges and adjustable With said mandrel to provide a smooth peripheral surface for at least a portion of the length of said expander jaws.
6. Apparatus for enlarging an extremity of a length of plastic pipe as set forth in claim 3 where the expansible spring means surrounding said mandrel assembly is a stainless steel spring sheath having overlapping edges and adjustable with said mandrel to provide a smooth peripheral surface for at least a portion of the length of said expander jaws.
US3677684D 1969-12-15 1969-12-15 Apparatus for enlarging an extremity of a plastic pipe Expired - Lifetime US3677684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US88490169A true 1969-12-15 1969-12-15

Publications (1)

Publication Number Publication Date
US3677684A true US3677684A (en) 1972-07-18

Family

ID=25385669

Family Applications (1)

Application Number Title Priority Date Filing Date
US3677684D Expired - Lifetime US3677684A (en) 1969-12-15 1969-12-15 Apparatus for enlarging an extremity of a plastic pipe

Country Status (1)

Country Link
US (1) US3677684A (en)

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732054A (en) * 1970-10-22 1973-05-08 Lyng Ind As Lekswikarmatur Annular expanding ring structure
US3749543A (en) * 1971-06-21 1973-07-31 Asc Ind Inc Apparatus for forming belled pipe couplings
US3825392A (en) * 1972-08-14 1974-07-23 Dickey W Clay Mfg Co Apparatus for forming pipe coupling
US3899280A (en) * 1973-06-05 1975-08-12 Cretex Co Inc Swaging unit for thermoplastic pipe
US3940227A (en) * 1974-06-20 1976-02-24 Strasser Georg J Expansible mandrel
US4015923A (en) * 1975-01-20 1977-04-05 Upo Osakeyhtio Device for producing expansions in plastics pipes and pipe components
US4021180A (en) * 1974-12-20 1977-05-03 Standard Oil Company (Indiana) Collapsible core
US4032282A (en) * 1973-09-24 1977-06-28 Wilson-Tek Corporation Apparatus for forming bells on plastic tubes
US4063862A (en) * 1975-06-23 1977-12-20 Arne Johansson Forming apparatus for synthetic-material tubes
US4181698A (en) * 1978-05-03 1980-01-01 Hayes Fay A Method of belling a plastic pipe
US4209161A (en) * 1977-11-03 1980-06-24 Wien-Fischamender Metallwarenfabrik Josef Suschny & Sohne Collapsible core for casting molds
US4236883A (en) * 1979-07-05 1980-12-02 Nrm Corporation Tire press
US4286766A (en) * 1980-04-18 1981-09-01 Holdt J W Von Collapsible mold core
US4378928A (en) * 1980-06-23 1983-04-05 Beatrice Foods Company Molding apparatus
US4383819A (en) * 1980-07-16 1983-05-17 Letica Corporation Apparatus for forming a container
US4395218A (en) * 1980-11-14 1983-07-26 S.I.C.A. Serrande.Infissi.Carpenteria.Attrezzatura S.P.A. Mechanical expansion plug for the internal calibration of plastic material tubes in general, particularly for fashioning the seats for gaskets
US4397629A (en) * 1979-11-23 1983-08-09 Yoshino Kogyosho Co. Ltd. Apparatus for drawing mouth-neck portions of synthetic resin bottles
US4412802A (en) * 1978-10-03 1983-11-01 Kubota Ltd. Molding device for forming a socket end on a plastic pipe
US4541605A (en) * 1983-02-16 1985-09-17 Daiichi-Geyer Kabushiki Kaisha Metal mold device
EP0206268A2 (en) * 1985-06-21 1986-12-30 BASF Aktiengesellschaft Winding mandrel for producing tubes from rovings of resinous filaments
US5039466A (en) * 1990-02-14 1991-08-13 Midwest Plastic Fabricators Method and apparatus for manufacturing plastic couplings
EP0963833A1 (en) * 1998-06-11 1999-12-15 S.I.C.A. SERRANDE INFISSI CARPENTERIA ATTREZZATURA S.p.A. Tool with multiple operative phases, to form satble bell mouths in terminal junction sections of pipes made of thermoplastic material
EP1043143A1 (en) * 1999-03-31 2000-10-11 SICA S.p.A. Method and apparatus for forming stable and internally regular bell mouth shapes on the terminal junction section of externally contoured pipes made of thermoplastic material
EP1043144A1 (en) * 1999-03-31 2000-10-11 SICA S.p.A. Apparatus with multiple operating phases for forming stable and internally regular bell mouth shapes on the terminal junction section of pipes made of thermoplastic material
US20070182065A1 (en) * 2006-02-07 2007-08-09 Adams Thomas R Method and mold for making non-metallic fiber reinforced parts
US20070289351A1 (en) * 2006-04-27 2007-12-20 Fatigue Technology, Inc. Wave relieving geometric features in structural members that are radially expandable into workpieces
EP2012964A1 (en) * 2006-04-24 2009-01-14 AIRBUS France Expansion tool for cold expansion of holes
US20100293950A1 (en) * 2007-11-09 2010-11-25 Richard Sojak Apparatus and method for forming an antipollution device housing
US20120119411A1 (en) * 2010-11-11 2012-05-17 Spirit Aerosystems, Inc. Reconfigurable shape memory polymer support tooling
US8353193B2 (en) 2005-12-28 2013-01-15 Fatigue Technology, Inc. Mandrel assembly and method of using the same
US8387436B2 (en) 2006-04-27 2013-03-05 Fatigue Technology, Inc. Alignment device and methods of using the same
US8402806B2 (en) 2006-08-28 2013-03-26 Fatigue Technology, Inc. Installation/processing systems and methods of using the same
US20130116662A1 (en) * 2011-05-02 2013-05-09 Andrea Schmid Method for manufacturing of a tubular object for insertion into a body passageway
US8506222B2 (en) 2008-07-18 2013-08-13 Fatigue Technology, Inc. Nut plate assembly and methods of using the same
US8568034B2 (en) 2006-01-11 2013-10-29 Fatigue Technology, Inc. Bushing kits, bearings, and methods of installation
EP2682253A1 (en) * 2012-07-04 2014-01-08 Maryvonne Management & Consulting AG Expansion tool and tool for installation pipes
US8636455B2 (en) 2009-04-10 2014-01-28 Fatigue Technoloy, Inc. Installable assembly having an expandable outer member and a fastener with a mandrel
US8647035B2 (en) 2009-12-16 2014-02-11 Fatigue Technology, Inc. Modular nut plate assemblies and methods of using the same
US8763229B2 (en) 2011-06-03 2014-07-01 Fatigue Technology, Inc. Expandable crack inhibitor method
US8938886B2 (en) 2012-01-30 2015-01-27 Fatigue Technology, Inc. Smart installation/processing systems, components, and methods of operating the same
US9114449B2 (en) 2011-06-15 2015-08-25 Fatigue Technology, Inc. Modular nut plates with closed nut assemblies
US10010983B2 (en) 2008-03-07 2018-07-03 Fatigue Technology, Inc. Expandable member with wave inhibitor and methods of using the same
EP3698941A3 (en) * 2019-02-20 2020-10-21 Milwaukee Electric Tool Corporation Pex expansion tool

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US729099A (en) * 1901-05-22 1903-05-26 Joseph K Smith Manufacture of pipes.
US1625131A (en) * 1924-01-26 1927-04-19 Timken Roller Bearing Co Die
US1698999A (en) * 1927-01-24 1929-01-15 American Can Co Necking-in or reforming tubular bodies
US1705843A (en) * 1926-02-19 1929-03-19 American Can Co Method and apparatus for forming an interiorly beaded or looped tearing-strip can
US2672175A (en) * 1952-06-03 1954-03-16 Russell B Howard Pipe expander
US2943667A (en) * 1957-10-14 1960-07-05 Arrowsmith Tool & Die Corp Expanding mandrel hydro-press
US2948031A (en) * 1957-09-09 1960-08-09 Thomas L Webb Piston molding core
US3248756A (en) * 1965-06-15 1966-05-03 Richard J Mills Expanding device for plastic pipe
US3339242A (en) * 1963-11-12 1967-09-05 Ketch Plastics Ltd Collapsible tools for use in the moulding, casting or pressing of hollow articles
US3373460A (en) * 1965-09-13 1968-03-19 Michael Ladney Jr. Molding apparatus

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US729099A (en) * 1901-05-22 1903-05-26 Joseph K Smith Manufacture of pipes.
US1625131A (en) * 1924-01-26 1927-04-19 Timken Roller Bearing Co Die
US1705843A (en) * 1926-02-19 1929-03-19 American Can Co Method and apparatus for forming an interiorly beaded or looped tearing-strip can
US1698999A (en) * 1927-01-24 1929-01-15 American Can Co Necking-in or reforming tubular bodies
US2672175A (en) * 1952-06-03 1954-03-16 Russell B Howard Pipe expander
US2948031A (en) * 1957-09-09 1960-08-09 Thomas L Webb Piston molding core
US2943667A (en) * 1957-10-14 1960-07-05 Arrowsmith Tool & Die Corp Expanding mandrel hydro-press
US3339242A (en) * 1963-11-12 1967-09-05 Ketch Plastics Ltd Collapsible tools for use in the moulding, casting or pressing of hollow articles
US3248756A (en) * 1965-06-15 1966-05-03 Richard J Mills Expanding device for plastic pipe
US3373460A (en) * 1965-09-13 1968-03-19 Michael Ladney Jr. Molding apparatus

Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732054A (en) * 1970-10-22 1973-05-08 Lyng Ind As Lekswikarmatur Annular expanding ring structure
US3749543A (en) * 1971-06-21 1973-07-31 Asc Ind Inc Apparatus for forming belled pipe couplings
US3825392A (en) * 1972-08-14 1974-07-23 Dickey W Clay Mfg Co Apparatus for forming pipe coupling
US3899280A (en) * 1973-06-05 1975-08-12 Cretex Co Inc Swaging unit for thermoplastic pipe
US4032282A (en) * 1973-09-24 1977-06-28 Wilson-Tek Corporation Apparatus for forming bells on plastic tubes
US3940227A (en) * 1974-06-20 1976-02-24 Strasser Georg J Expansible mandrel
US4021180A (en) * 1974-12-20 1977-05-03 Standard Oil Company (Indiana) Collapsible core
US4015923A (en) * 1975-01-20 1977-04-05 Upo Osakeyhtio Device for producing expansions in plastics pipes and pipe components
US4063862A (en) * 1975-06-23 1977-12-20 Arne Johansson Forming apparatus for synthetic-material tubes
US4209161A (en) * 1977-11-03 1980-06-24 Wien-Fischamender Metallwarenfabrik Josef Suschny & Sohne Collapsible core for casting molds
US4181698A (en) * 1978-05-03 1980-01-01 Hayes Fay A Method of belling a plastic pipe
US4412802A (en) * 1978-10-03 1983-11-01 Kubota Ltd. Molding device for forming a socket end on a plastic pipe
US4236883A (en) * 1979-07-05 1980-12-02 Nrm Corporation Tire press
US4397629A (en) * 1979-11-23 1983-08-09 Yoshino Kogyosho Co. Ltd. Apparatus for drawing mouth-neck portions of synthetic resin bottles
US4286766A (en) * 1980-04-18 1981-09-01 Holdt J W Von Collapsible mold core
US4378928A (en) * 1980-06-23 1983-04-05 Beatrice Foods Company Molding apparatus
US4383819A (en) * 1980-07-16 1983-05-17 Letica Corporation Apparatus for forming a container
US4395218A (en) * 1980-11-14 1983-07-26 S.I.C.A. Serrande.Infissi.Carpenteria.Attrezzatura S.P.A. Mechanical expansion plug for the internal calibration of plastic material tubes in general, particularly for fashioning the seats for gaskets
US4541605A (en) * 1983-02-16 1985-09-17 Daiichi-Geyer Kabushiki Kaisha Metal mold device
EP0206268A2 (en) * 1985-06-21 1986-12-30 BASF Aktiengesellschaft Winding mandrel for producing tubes from rovings of resinous filaments
EP0206268A3 (en) * 1985-06-21 1987-01-21 Basf Aktiengesellschaft Winding mandrel for producing tubes from rovings of resinous filaments
US5039466A (en) * 1990-02-14 1991-08-13 Midwest Plastic Fabricators Method and apparatus for manufacturing plastic couplings
EP0963833A1 (en) * 1998-06-11 1999-12-15 S.I.C.A. SERRANDE INFISSI CARPENTERIA ATTREZZATURA S.p.A. Tool with multiple operative phases, to form satble bell mouths in terminal junction sections of pipes made of thermoplastic material
EP1043143A1 (en) * 1999-03-31 2000-10-11 SICA S.p.A. Method and apparatus for forming stable and internally regular bell mouth shapes on the terminal junction section of externally contoured pipes made of thermoplastic material
EP1043144A1 (en) * 1999-03-31 2000-10-11 SICA S.p.A. Apparatus with multiple operating phases for forming stable and internally regular bell mouth shapes on the terminal junction section of pipes made of thermoplastic material
US6457966B1 (en) 1999-03-31 2002-10-01 Sica S.P.A. Apparatus with multiple operating phases for forming stable and internally regular bell mouth shapes on the terminal junction section of pipes made of thermoplastic material
US8353193B2 (en) 2005-12-28 2013-01-15 Fatigue Technology, Inc. Mandrel assembly and method of using the same
US8568034B2 (en) 2006-01-11 2013-10-29 Fatigue Technology, Inc. Bushing kits, bearings, and methods of installation
US7704067B2 (en) * 2006-02-07 2010-04-27 Tiodize Company, Inc. Method and mold for making non-metallic fiber reinforced parts
US20070182065A1 (en) * 2006-02-07 2007-08-09 Adams Thomas R Method and mold for making non-metallic fiber reinforced parts
EP2012964B1 (en) * 2006-04-24 2016-09-14 Airbus Operations Expansion tool for cold expansion of holes
US8302448B2 (en) 2006-04-24 2012-11-06 Airbus Operations Sas Expansion tool and method for cold expansion of holes
EP2012964A1 (en) * 2006-04-24 2009-01-14 AIRBUS France Expansion tool for cold expansion of holes
US8387436B2 (en) 2006-04-27 2013-03-05 Fatigue Technology, Inc. Alignment device and methods of using the same
US20070289351A1 (en) * 2006-04-27 2007-12-20 Fatigue Technology, Inc. Wave relieving geometric features in structural members that are radially expandable into workpieces
US8402806B2 (en) 2006-08-28 2013-03-26 Fatigue Technology, Inc. Installation/processing systems and methods of using the same
US20100293950A1 (en) * 2007-11-09 2010-11-25 Richard Sojak Apparatus and method for forming an antipollution device housing
US8701288B2 (en) * 2007-11-09 2014-04-22 Gws Tube Forming Solutions Inc. Apparatus and method for forming an antipollution device housing
US10010983B2 (en) 2008-03-07 2018-07-03 Fatigue Technology, Inc. Expandable member with wave inhibitor and methods of using the same
US8506222B2 (en) 2008-07-18 2013-08-13 Fatigue Technology, Inc. Nut plate assembly and methods of using the same
US8636455B2 (en) 2009-04-10 2014-01-28 Fatigue Technoloy, Inc. Installable assembly having an expandable outer member and a fastener with a mandrel
US8647035B2 (en) 2009-12-16 2014-02-11 Fatigue Technology, Inc. Modular nut plate assemblies and methods of using the same
US20120119411A1 (en) * 2010-11-11 2012-05-17 Spirit Aerosystems, Inc. Reconfigurable shape memory polymer support tooling
US8945455B2 (en) * 2010-11-11 2015-02-03 Spirit Aerosystems, Inc. Reconfigurable shape memory polymer support tooling
US20130116662A1 (en) * 2011-05-02 2013-05-09 Andrea Schmid Method for manufacturing of a tubular object for insertion into a body passageway
US9352504B2 (en) * 2011-05-02 2016-05-31 Dentsply International Inc. Method for manufacturing of a tubular object for insertion into a body passageway
US8763229B2 (en) 2011-06-03 2014-07-01 Fatigue Technology, Inc. Expandable crack inhibitor method
US9114449B2 (en) 2011-06-15 2015-08-25 Fatigue Technology, Inc. Modular nut plates with closed nut assemblies
US8938886B2 (en) 2012-01-30 2015-01-27 Fatigue Technology, Inc. Smart installation/processing systems, components, and methods of operating the same
US10843250B2 (en) 2012-01-30 2020-11-24 Fatigue Technology, Inc. Smart installation/processing systems, components, and methods of operating the same
US10130985B2 (en) 2012-01-30 2018-11-20 Fatigue Technology, Inc. Smart installation/processing systems, components, and methods of operating the same
EP2682253A1 (en) * 2012-07-04 2014-01-08 Maryvonne Management & Consulting AG Expansion tool and tool for installation pipes
EP3698941A3 (en) * 2019-02-20 2020-10-21 Milwaukee Electric Tool Corporation Pex expansion tool

Similar Documents

Publication Publication Date Title
US4698196A (en) Method and apparatus for extruding creaseless thin walled tubes
US2615413A (en) Internal pipe aligning clamp
US2423260A (en) Extrusion of tubing
US2372737A (en) Torch for welding thermoplastic material
US4799540A (en) Heat exchanger
US4312383A (en) Hose construction and apparatus for and method of making same
CA1314201C (en) Method and apparatus for lining a buried or installed pipe with a polymer liner
US4929409A (en) Method in manufacturing a heat insulated tube and a device in extruders for manufacturing the tube
US3908704A (en) Corrugated tubing
US3376180A (en) Method and apparatus for forming a spiral wound tube having an extruded plastic liner
US5091137A (en) Pipe lining process
US4927642A (en) Apparatus for welding tubular components of thermoplastic material
US4161384A (en) Apparatus to form a bell end in a plastic pipe
US3952936A (en) Reforming pipe clamp
US3861847A (en) Automated bending and belling of plastic pipe
US3592038A (en) Tool and/or machine tool to work a hole and its flange into a wall for a branch pipe to be attached to the wall
ES401152A1 (en) Method of making a pipe-coupling part
US2347101A (en) Method of making corrugated tubes
JPH03106523A (en) Method and apparatus for tube expansion
US3835688A (en) Apparatus and method for sizing holes
US3634167A (en) Method of fabricating welded branched pipe connections from weldable thermoplastic materials
DK201100031A (en) Expansion apparatus and method for tubular elements
US5810053A (en) Pipe liner, a coiled liner product and methods for forming, installing and coiling the liner
EP0056811A1 (en) Method and apparatus for shaping the ends of spirally-formed thermoplastic tube and pipe made thereby
ES431416A1 (en) Device for producing externally ribbed pipes of plastic