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US3217501A - Apparatus for forming tubes from strip material - Google Patents

Apparatus for forming tubes from strip material Download PDF

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Publication number
US3217501A
US3217501A US78989A US7898960A US3217501A US 3217501 A US3217501 A US 3217501A US 78989 A US78989 A US 78989A US 7898960 A US7898960 A US 7898960A US 3217501 A US3217501 A US 3217501A
Authority
US
United States
Prior art keywords
tine
guide
trench
strip
strip material
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
US78989A
Other languages
English (en)
Inventor
Boa Walter
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.)
National Research Development Corp UK
Original Assignee
Nat Res Dev
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
Priority claimed from GB4446759A external-priority patent/GB969949A/en
Application filed by Nat Res Dev filed Critical Nat Res Dev
Priority claimed from FR883115A external-priority patent/FR1308939A/fr
Application granted granted Critical
Publication of US3217501A publication Critical patent/US3217501A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/58—Snap connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0826—Preparing the edges of the metal sheet with the aim of having some effect on the weld
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/101—Making of the seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/139—Interpenetrating fingered joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/22—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns
    • B29C66/227—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being in the form of recurring patterns being in the form of repetitive interlocking undercuts, e.g. in the form of puzzle cuts
    • B29C66/2272—Teardrop-like, waterdrop-like or mushroom-like interlocking undercuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking

Definitions

  • This invention relates to apparatus for forming tubes from strip material which is sufficiently flexible to be rolled into the form of a tube but sufliciently rigid to be self-supporting in its tubular form, the strip having formations along one edge which are adapted to interlock with complementary formations on the opposite edge when the two edges are brought together.
  • strip material will be referred to as strip material of the kind specified.
  • Strip material from which tubes may be formed by the apparatus of the invention may consist of thin metal, for example, but is preferably a flexible plastic material such as polyvinyl chloride which is thick enough to have the desired rigidity when in tubular form. Suitable forms of strip material are described in the present applicants co-pending application Serial No. 73,869 filed December 12, 1960, now abandoned.
  • Apparatus according to the present invention for forming a tube from such strip material comprises a guide which at one end receives the strip in substantially flat form and, as the strip is passed through the guide, progressively curves the strip towards a tubular form until its edges overlap, and means for depressing the overlapping edges of the strip towards the centre of the formed tube to force the formations on these edges into interlocking engagement.
  • the means for depressing the overlapping edges of the strip may be an integral part of the guide.
  • the purpose of the guide is to receive the strip and progressively guide it towards a tubular form by bringing the two edges of the strip progressively closer towards each other until they are in overlapping relationship.
  • the means for depressing the overlapping edges of the strip then forces these edges towards the centre of the formed tube whereby the complementary formations along the two edges interlock with one another to complete the tube.
  • the guide may have channels which receive the marginal edge portions of the strip and guide the edges towards each other.
  • the formed tube it is not necessary for the formed tube to be of circular cross-section.
  • it may be of oval or elliptical cross-section. This is sometimes desirable to enable the formed tube to be accommodated in a confined space, for example in a narrow trench.
  • the apparatus of the invention may have various applications, one useful application being in a pipe-laying machine for laying field drain pipes made of the strip material.
  • a pipe-laying machine has means for forming a furrow, groove or trench (hereinafter referred to simply as a trench) with the said apparatus incorporated therein, this apparatus being disposed to form the strip material into a continuous pipe and deposit this pipe in the trench.
  • the trench-forming means is conveniently a hollow time with the apparatus fitted therein.
  • the angle between the leading edge of the tine and the line of the laid pipe may vary.
  • the guide may be pivoted to the tine so that the rear end thereof through which the formed pipe emerges can remain in contact with the bottom of the trench despite changes in angle between the leading edge of the tine and the line of the laid pipe.
  • the tine carries a bar round which the strip passes on its way to the guide.
  • this bar is preferably also pivoted and is so connected to the guide as to tilt through approximately half the angle by which the guide tilts 1n relation to the tine. This enables the strip to be fed to the bar or roller at an unvarying angle in relation to the tine, despite the tilting movements of the guide.
  • FIGURE 1 is a fragmentary side view of a tine of a pipe-laying machine, partially broken away to show the uide;
  • FIGURE 2 is a sectional plan view taken on the line II-II in FIGURE 1;
  • FIGURES 3 to 7, inclusive are sections of the guide taken respectively on the lines IIIIII to VIIVII in FIGURE 1;
  • FIGURE 8 is a perspective view of the strip material being converted into tubular form, the surrounding parts of the apparatus being omitted for clarity.
  • a tine 10 is mounted on a pipe-laying machine (not shown) with its lower end at a predetermined depth below ground level so that, as the machine advances, the tine forces its way through the ground and forms a narrow trench.
  • the tine has a sharp V-section leading edge 11 raked at an angle of approximately 45 to the vertical.
  • the forward lower end of the leading edge 11 is provided with a share 12 the lower edge 13 of which is shaped to form a half-round bed for the formed pipe at the bottom of the trench.
  • the tine is provided with side plates 14. Between the side plates 14 and pivotally connected thereto by pivot pins 15 is a guide carrier 16. At its rear end the guide carrier 16 is connected to a die 17 having an aperture of oval cross-section. Connected to the front of the die and supported by the carrier 16 is a guide 18. At its forward end this guide is substantially flat, but is provided at top and bottom with channels 19. Regarded in crosssection, the shape of the guide changes progressively from right to left in the drawings, as shown in FIGURES 3 to 7, the channels 19 coming progressively closer together as shown in FIGURES 3 and 4, and then turning inwardly as shown in FIGURE 5. Between the section planes VV and VI-VI the channels 19 meet and merge into a V-shaped portion 20 (FIGURE 6), the guide finally forming a complete oval at the section plane VIL-VII as shown in FIGURE 7.
  • Strip material 21 for forming the pipe is fed from a reel (not shown) down through the tine in FIGURE 1 until it meets a pivotally-mounted bar 22 of round cross-section.
  • This bar is mounted on a yoke 23 which is pivotally mounted on the pins 15.
  • the bar may be fixed to the yoke so that the strip slides round it, or it may be rotatably mounted so that it acts as a roller. Having passed round the bar 22, the strip enters the guide 18, its longitudinal marginal edges 43 (FIGURE 8) engaging in the channels 19.
  • FIG- extending arms 25 which are attached by a link 26 to the mid-point of a lever 27 pivoted by its front end to the tine at the point 28.
  • the rear end of the lever .27 is pivotally connected by a link 29 to a portion 30 of the carrier 18 which extends forwardly of the pin 15.
  • the carrier 16 is urged in the downward direction by a compression spring 31, so that the die 17 is pressed against the bottom of the trench formed by the tine 10 and the share 12.
  • a chute 32 the lower rear portion of which is open at 33 so that gravel or the like can be tipped down the chute and discharged into the trench over the pipe as it emerges from the die 17.
  • Plow apparatus for forming an elongated trench and simultaneously depositing a continuous length of an elongated flexible member, comprising: a hollow plow tine defining foot means for forming a trench by forcing forwardly through the ground, an elongated rearwardly extending guide means Within and pivoted to the tine for relative pivotal movement therewith so as to remain in contact with the trench bottom over limited changes of angular attitude of the plow tine, said guide means having a forward end portion, means in the tine enabling feeding of a continuous length of flexible material down the interior of the tine to the foot means and rearwardly through the guide means and into the formed trench, said means enabling feeding comprising a bar pivotably mounted in the interior of the tine at the forward end portion of the guide means, the continuous length of flexible material passing around and in contact with the bar and being directed by the bar toward the guide means, the bar being connected to the guide means by pivot means enabling the pivoting of the bar in the same direction and through approximately half the angle by which the guide means pivots in relation to the tine for the
  • pivoting means comprises a lever pivoted to the tine, a first link connecting the bar to a first point of the lever, and a second link connecting the guide means to a second point of the lever, the radial distance from the pivotal axis of the lever to the first point being one-half the radial distance from the pivotal axis of the lever to the second point.
  • the tine comprises a hollow coulter having a rearwardly-inclining leading edge and a hollow casing depending from the rear edge of the lower part of the coulter and having a normally horizontal lower edge, the guide means being mounted within the hollow casing.
  • Plough apparatus located behind the coulter and having a downwardly open mouth at its lower end behind the rear end of the guide means for discharging material into the trench to cover the flexible material laid in the trench.
  • a pipe laying machine comprising an inclined hollow tine for forming a trench and apparatus connected to and disposed at least partly within said hollow tine for forming a continuous pipe from a strip of flexible material having mutually interlockable marginal edge portions formed With alternate projections and notches and for laying the pipe in the trench, said apparatus including elongated hollow guide means having a longitudinal axis and including an inlet end portion, an outlet end portion and an intermediate portion disposed along said longitudinal axis, the inlet end portion having one substantially flat wall portion disposed in a plane substantially parallel to said longitudinal axis, the outlet end portion having a substantially complete tubular internal cross-section with a dimension parallel to the plane of the wall portion and transversely of the longitudinal axis which is substantially less than the transverse width of the wall as measured in the same sense, the intermediate portion having a smoothly profiled internal surface which merges from the cross-section of the inlet end portion to that of the outlet end portion, an internal deflector on the side of the intermediate portion away from the fiat side wall of the inlet end portion
  • pivot means comprises a lever pivoted to the tine, a first link connecting the bar guide to a first point of the lever, and a second link connecting the hollow guide means to a second point of the lever, the radial distance from the pivotal axis of the lever to the first point being one-half the radial distance from the pivotal axis of the lever to the second point.
  • Apparatus for forming a continuous tube from flexible strip material having mutually interlockable marginal edge portions of alternate projections and notches comprising an elongated hollow guide member through which the strip material can be moved, said guide member having a longitudinal axis and including an inlet portion at one end of said axis, an intermediate portion extending along said axis, and an outlet portion at the other end of said axis, said inlet, outlet and intermediate portions being substantially aligned along said axis, said inlet portion having one substantially flat wall portion, said outlet portion having a substantially compietetubular internal cross-section with a dimension parallel to said flat wall portion and transversely of said axis which is substantially less than the width of the wall measured in the same sense, said intermediate portion having a smoothly profiled internal surface which merges from the cross-section of the inlet portion to that of the outlet portion, said guide member having successive internal cross-sections from inlet to outlet for bringing the longitudinal marginal edges of the strip material progressively toward each other about said longitudinal axis on the opposite side of
  • the intermediate portion of the guide member has an opening in the side thereof away from said flat wall portion of the inlet portion, and includes channeled edges at the transverse extremities of said opening facing away from said opening for receiving the marginal edges of the strip therein, the channeled edges converging progressively and terminating short of said deflector.
  • the intermediate portion of said guide member has an opening in the side thereof opposite said flat portion of the inlet portion and progressively-inturned marginal portions on opposite longitudinal edges of said opening, which edges are channeled in opposite directions to have the channels face away from the opening, said progressively-inturned marginal portions converging progressively towards one another along the length of said intermediate portion and meeting at an angle, and in which the deflector comprises an inwardly directed V-sectioned longitudinal rib formed at the meeting of said marginal portions and extending along the interior of said guide member substantially to the end of the outlet portion.
  • Apparatus according to claim 7, including a bar guide for the strip material mounted adjacent the inlet portion of said hollow guide member, the bar guide having a longitudinal axis lying in a plane parallel to the plane of said flat wall portion of the inlet portion.
  • a pipe laying machine comprising an inclined hollow tine for forming a trench, and apparatus connected to and disposed at least partly within said hollow tine for forming a continuous pipe from a strip of flexible material having mutually interlockable marginal edge portions formed with alternate projections and notches and for laying the pipe in the trench, said apparatus comprising an elongated hollow guide member through which the strip material can be moved, said guide member having a longitudinal axis and including an inlet portion at one end of said axis, an intermediate portion extending along said axis, and an outlet portion at the other end of said axis, said inlet, outlet and intermediate portions being substantially aligned along said axis, said inlet 'stantially less than the width of the wall measured in the same sense, said intermediate portion having a smoothly profiled internal surface which merges from the crosssection of the inlet portion to that of the outlet portion, said guide member having successive internal cross-sections from inlet to outlet for progressively bringing the longitudinal marginal edges of the strip material toward each other about said longitudinal axis on the
  • a pipe laying machine wherein the guide member is pivoted to the hollow tine about a normally horizontal pivotal axis located at the front of the guide member, and further comprising spring member coacting between the rear end of the guide means and the hollow tine to urge the rear of the guide member downwardly relatively to the tine.
  • a pipe laying machine according to claim 15 and further including pivot means pivotally connecting the guide member to the hollow tine to permit relative pivotal movement between the guide member and the tine about the pivot means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Soil Working Implements (AREA)
US78989A 1959-12-31 1960-12-28 Apparatus for forming tubes from strip material Expired - Lifetime US3217501A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4446759A GB969949A (en) 1959-12-31 1959-12-31 Apparatus for forming tubes from strip material
FR883115A FR1308939A (fr) 1959-12-31 1961-12-27 Appareil pour former des tubes à partir de matériaux en bandes

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US3217501A true US3217501A (en) 1965-11-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396541A (en) * 1965-04-19 1968-08-13 Intrusion Prepakt Inc Means and method for construction sand drains in the earth's surface
US4283160A (en) * 1979-03-07 1981-08-11 Angle William M Corrugated pipe fabricator and installer device and methods of making and using the same
US4397585A (en) * 1981-01-22 1983-08-09 Hancor, Inc. Apparatus for inserting foldable conduit below ground
US4448567A (en) * 1980-02-05 1984-05-15 Pipe Master International Ltd. Method for installing lines, pipes or cables underground
EP1177966A2 (en) * 2000-08-04 2002-02-06 Nsk Ltd., Hollow rack shaft

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL93022C (pt) *
US628039A (en) * 1898-02-25 1899-07-04 Edwin O Rood Tile-laying machine.
GB283035A (en) * 1927-04-23 1928-01-05 Hugh Munro Improvements in drain ploughs and in methods of constructing land drains
US1904666A (en) * 1930-04-09 1933-04-18 Sack Hans Apparatus for laying drain pipes or cables
US2330207A (en) * 1941-01-22 1943-09-28 Contrinental Can Company Inc Method of making sheet metal containers
US2754784A (en) * 1951-02-19 1956-07-17 British Insulated Callenders Manufacture of a metal tube which may form part of an electric cable
US2762117A (en) * 1953-07-13 1956-09-11 Gen Motors Corp Method of forming an interlocking bushing
US2855252A (en) * 1954-09-29 1958-10-07 Clevite Corp Clinched butt bushing
US2911932A (en) * 1954-03-25 1959-11-10 William Wallace Company Tube making machine
US2912075A (en) * 1953-03-28 1959-11-10 Pfistershammer Josef Support structure constructed from hollow members, more particularly tubes of thin hard-rolled metal sheets
US3059437A (en) * 1959-07-15 1962-10-23 Int Harvester Co Cutter for seed tape planter
US3120107A (en) * 1958-12-04 1964-02-04 Juusela Taneli Method of and a device for making drain pipes

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL93022C (pt) *
US628039A (en) * 1898-02-25 1899-07-04 Edwin O Rood Tile-laying machine.
GB283035A (en) * 1927-04-23 1928-01-05 Hugh Munro Improvements in drain ploughs and in methods of constructing land drains
US1904666A (en) * 1930-04-09 1933-04-18 Sack Hans Apparatus for laying drain pipes or cables
US2330207A (en) * 1941-01-22 1943-09-28 Contrinental Can Company Inc Method of making sheet metal containers
US2754784A (en) * 1951-02-19 1956-07-17 British Insulated Callenders Manufacture of a metal tube which may form part of an electric cable
US2912075A (en) * 1953-03-28 1959-11-10 Pfistershammer Josef Support structure constructed from hollow members, more particularly tubes of thin hard-rolled metal sheets
US2762117A (en) * 1953-07-13 1956-09-11 Gen Motors Corp Method of forming an interlocking bushing
US2911932A (en) * 1954-03-25 1959-11-10 William Wallace Company Tube making machine
US2855252A (en) * 1954-09-29 1958-10-07 Clevite Corp Clinched butt bushing
US3120107A (en) * 1958-12-04 1964-02-04 Juusela Taneli Method of and a device for making drain pipes
US3059437A (en) * 1959-07-15 1962-10-23 Int Harvester Co Cutter for seed tape planter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396541A (en) * 1965-04-19 1968-08-13 Intrusion Prepakt Inc Means and method for construction sand drains in the earth's surface
US4283160A (en) * 1979-03-07 1981-08-11 Angle William M Corrugated pipe fabricator and installer device and methods of making and using the same
US4448567A (en) * 1980-02-05 1984-05-15 Pipe Master International Ltd. Method for installing lines, pipes or cables underground
US4397585A (en) * 1981-01-22 1983-08-09 Hancor, Inc. Apparatus for inserting foldable conduit below ground
EP1177966A2 (en) * 2000-08-04 2002-02-06 Nsk Ltd., Hollow rack shaft
EP1177966A3 (en) * 2000-08-04 2006-04-12 NSK Ltd., Hollow rack shaft

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Publication number Publication date
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