Classifications

• • A—HUMAN NECESSITIES
  • A63—SPORTS; GAMES; AMUSEMENTS
  • A63G—MERRY-GO-ROUNDS; SWINGS; ROCKING-HORSES; CHUTES; SWITCHBACKS; SIMILAR DEVICES FOR PUBLIC AMUSEMENT
  • A63G21/00—Chutes; Helter-skelters

Definitions

• This invention relates to a process for the production of permanently curved pipe member sections for use in a slideway means.
• the present invention resides in a process for producing a permanently curved pipe member section for use in a slideway or similar guide arrangement, characterised by segmentally splitting up a rectilinear and longitudinally divided pipe member section in a transverse direction and over a substantial portion of its arcuate contour from one or two opposite edge sides of the pipe member section and/or between edge portions in the central portion of the pipe member section to form a series of transverse edge flaps or strips and leave behind a pipe portion or a pair of opposite pipe portions unsplit in the transverse direction of between 5° and 45°, bending the resulting pipe member section in a longitudinal direction about the unsplit pipe portion or portions to establish a permanently curved contour while swinging together said edge flaps or strips one over the other into a gradually increasing, mutually overlapping engagement determined by the degree of curvature of said pipe member section, and fastening said edge flaps or strips into permanent engagement with each other.
• the splitting or saw tool which is employed be placed at a pointed angle on the wall of the pipe on splitting up so that the slot which is formed lies in a plane which crosses the wall and/or original axial direction of the pipe member section at an angle of between 15o and 45o, for example about 20o.
• Fig. 1 is a schematic view of a slideway constructed of permanently curved pipe member sections
• Fig. 2 is a cross-section of a divided pipe profile of a pipe member section according to a first embodiment
• Fig. 3 is a scrap representation of a pipe member section having the pipe profile according to Fig. 2 and seen from above after a segmental splitting up of the pipe member section in the transverse direction has been effected
• Fig. 4 is a similar representation to Fig. 3 showing the pipemember section after bending to a specific curved contour
• Fig. 5 is a cross-section of walls of the pipe member section where split-up pipe portions are displaced relative to each other to a relatively small extent
• Fig. 6 is a cross-section of walls of the pipe member section where split-up pipe portions overlap each other to a relatively greater extent
• Fig. 7 is a cross-section of a divided pipe profile according to a second embodiment
• Fig. 8 is a scrap section of a pipe member section with the pipe profile according to Fig. 7 shown in the bent condition
• Fig. 9 is a cross-section of a divided pipe profile according to a third embodiment.
• Fig. 10 is a scrap representation of a pipe member section with the pipe profile according to Fig. 9 shown in the bent condition.
• a slideway consists of a straight pipe member section 10a, a pipe member section 10b with successive convex and concave curve contours and a pipe member section 10c with a relatively gentle curve contour.
• a pipe profile 10 which is made by the longitudinal division of a circular pipe of, for example, extruded synthetic plastics material.
• the pipe profile extends over an angular arc of about 225o.
• a, pipe member section with a pipe profile according to Fig. 2 and in Fig. 2 and 3 there is a segmental splitting up of the pipe member section from two opposite edges of the pipe member section having a first, short incision 11 and a second, elongate incision 12, there being left behind an unsplit intermediate arcuate pipe portion 13.
• the incision 11 extends over an arcuate angle of about 27o while the incision 12 extends over an arcuate angle of about 162 and the intermediate, unsplit arcuate pipe portion 13 extends over an arcuate angle of about 36°.
• the section is shown after it is bent about or around the arcuate pipe portion 13 with a convex outwardly directed curved contour at the unsplit arcuate pipe portion 13, that is to say the arcuate pipe portion 13 forms the outer curve of the curved contour, while the edge portion of the section, at the outer edge of the incision 12, forms the inner curve of the curved contour.
• the pipe member section in Fig. 4 is given a curved contour in the centre line plane of the arcuate pipe portion 13.
• Fig. 5 there are shown overlapping arcuate pipe portions, for example, at the middle of the incision 11 and in Fig. 6 there are shown overlapping arcuate pipe portions, for example, at the middle of the incision 12.
• the incisions have been effected along the plane which crosses the longitudinal axis of the pipe member section according to Fig. 2 at an angle of about 20o.
• obliquely bevelled edge portions which are strongly pointed so that the edge flaps 14 which form between the incisions 11 and the edge flaps 15 which form between the incisions 12 can be readily displaced relative to each other and fit relatively tightly to each other during bending of the pipe member section from the position shown in Fig.
• edge flaps 14 and 15 are welded together or jointed together in another suitable way via a joint connection as shown at 16.
• the joint connection is preferably designed so that there is formed a uniform transition from flap to flap.
• the bent pipe member section where it is exposed to particularly large loading is normally formed by the outer curve of the curved contour, that is to say the unsplit arcuate pipe portion 13 of the pipe section.
• the pipe member section extends without joints and without irregularities.
• Fig. 7 there is shown a pipe profile 10a which extends over an arcuate angle of about 180°.
• FIG. 8 there is shown a pipe member section with the pipe profile according to Fig. 7 after the pipe member section is bent about or around in the vertical plane with a convex downwardly directed curved contour at the unsplit portion 13a. There are illustrated mutually overlapping edge flaps 14a.
• a pipe profile 10b which extends over an arcuate angle of about 180°.
• an incision 17 in the bottom portion or middle portion of the pipe member section over an arcuate angle c of about 170°, while there are left behind, at two opposite edge portions of the pipe member section, an unsplit arcuate pipe portion 18 and 19 respectively, each with an arcuate angle a and b of about 5°.
• corresponding strips 20 which mutually overlap each other in a manner which corresponds substantially to the edge flaps as shown in Figs. 4 and 8.
• the pipe member section is bent in the vertical plane with a convex upwardly directed curved contour.
• a pipe made of, for example, extruded synthetic plastics mate- rial and having a pipe profile of uniform wall thickness, to ensure a bending of the pipe member section in a specific plane by a relatively simple longitudinal division into said pipe member section of desired arcuate pipe profile and by simple segmental splitting up, in the transvere direction, into arcuate pipe regions suitable for this purpose.
• the said planes can, as desired, extend vertically or horizontally or, if desired, more or less obliquely in the vertical plane and the horizontal plane all according to the disposition of the incisions in the arc of the pipe.

Landscapes

• Rigid Pipes And Flexible Pipes (AREA)
• Dowels (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19888123

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (1)

• 1985
  • 1985-02-18 NO NO850623A patent/NO156676C/no unknown
• 1986
  • 1986-02-12 EP EP19860901148 patent/EP0215814A1/de not_active Withdrawn
  • 1986-02-12 WO PCT/NO1986/000015 patent/WO1986004827A1/en not_active Application Discontinuation
  • 1986-02-12 AU AU53976/86A patent/AU5397686A/en not_active Abandoned

Non-Patent Citations (1)

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