EP0473894B1 - Etançon à filetage - Google Patents

Etançon à filetage Download PDF

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Publication number
EP0473894B1
EP0473894B1 EP91110718A EP91110718A EP0473894B1 EP 0473894 B1 EP0473894 B1 EP 0473894B1 EP 91110718 A EP91110718 A EP 91110718A EP 91110718 A EP91110718 A EP 91110718A EP 0473894 B1 EP0473894 B1 EP 0473894B1
Authority
EP
European Patent Office
Prior art keywords
thread
inner tube
wall thickness
spindle support
tube
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
EP91110718A
Other languages
German (de)
English (en)
Other versions
EP0473894A1 (fr
Inventor
Ernst-Friedrich Dipl.-Ing. Ischebeck
Jochen Isenberg
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.)
Friedr Ischebeck GmbH
Original Assignee
Friedr Ischebeck GmbH
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 Friedr Ischebeck GmbH filed Critical Friedr Ischebeck GmbH
Publication of EP0473894A1 publication Critical patent/EP0473894A1/fr
Application granted granted Critical
Publication of EP0473894B1 publication Critical patent/EP0473894B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G25/06—Shores or struts; Chocks telescopic with parts held together by positive means
    • E04G25/065—Shores or struts; Chocks telescopic with parts held together by positive means by a threaded nut
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G2025/042—Shores or struts; Chocks telescopic with devices to avoid accidental disengagement of the telescopic elements, e.g. during transport

Definitions

  • the invention relates to a spindle support consisting of two telescopically displaceable tubes with an external thread formed on an internal tube, on which an adjusting nut runs, the external thread being rolled up.
  • Spindle supports designed in this way are known from practice, an inner tube having a long external thread and a nut running thereon, suitably a so-called swivel nut, being provided.
  • the length of the spindle support is adjusted via the thread.
  • a double-start trapezoidal or round thread is usually used.
  • efforts are made to match the bending resistance of the outer and inner tubes so that they are approximately the same.
  • the lowest possible weight should be achieved with the lowest possible weight. Since the inner tube generally has a lower section modulus against bending due to its smaller diameter, a different material characteristic with regard to the permissible yield stress is used to compensate for the strength of the inner tube.
  • the permissible yield stress can be achieved either by using a material with a higher overall strength or by strain hardening during thread rolling.
  • a material with a higher overall strength or by strain hardening during thread rolling.
  • German patent DE-A-34 45 657 This is a one arranged on an outer tube Threads, in order to achieve a configuration which is advantageous in terms of production, an expansion of the outer tube was first carried out and then an upsetting again in the course of thread rolling.
  • the object of the invention is to design and develop a spindle support with the features required at the outset in such a way that, with the highest possible load-bearing capacity and strength as well as security against buckling, a user-friendly design is provided.
  • Opening the thread flanks at an angle of 80 to 90 ° inevitably results - starting from a given thread head width - in a comparatively large shear surface assigned to a thread.
  • the thread formation also proves to be surprisingly advantageous with regard to soiling, in particular concrete soiling. Such dirt adheres far less well to the thread. In any case, they can be solved very easily. Due to the favorable geometric conditions of the thread, a high fatigue strength of the inner tube is also achieved. It is also essential that the thread is formed practically over the entire length of the inner tube. The notch tensions are very low.
  • the thread flanks of the thread valley have a flank angle of approx. 40 ° - 45 ° at the specified opening angle.
  • the inner tube is preferably very thin-walled. Preferably in a ratio of diameter to wall thickness of about 18.
  • the relatively high work hardening makes it possible to compensate for the lower section modulus of the inner tube by a larger permissible stress.
  • the pitch angle of the thread is advantageously at the limit of self-locking. Due to this inclination angle of approximately 6 °, no further inhibiting element or the like is required to secure the vertebral nut.
  • the specified conditions also make it possible for the inner tube to consist of a conventional structural steel, for example an ST 37. In particular, an ST 37-2 is preferred.
  • the spindle support provided as a whole with the number 1 has an outer tube 2 and an inner tube 3.
  • the lower end of the outer tube 2 is equipped with a base plate 4, while the end of the inner tube 3 protruding from the outer tube 2 carries a head plate 5 on the end face.
  • the outer tube 2 is provided on the outside wall with four beads 6 arranged at the same distance from one another.
  • the elevations of the beads 6 on the inside wall serve as an end stop for the inner tube 3.
  • the inner tube 3 slidably arranged in the outer tube 2 has approximately the same length as the outer tube 2. Starting from the top plate 5, an external thread 7 extends into the lower quarter of the inner tube 3. In its lower end region, the inner tube 3 is widened to form a stop shoulder 8.
  • the inner tube 3 is made of mild steel ST 37-2 and has very thin walls, the ratio of diameter to wall thickness being approximately 18.
  • the external thread 7 is rolled onto the inner tube 3.
  • it is a double-start, trapezoidal thread, the opening angle alpha of the thread valley being approximately 90 ° (cf. FIG. 3).
  • the thread 7 is designed so that the remaining wall thickness a in the thread base 9 is approximately equal to the wall thickness of the outlet pipe.
  • the pitch angle of the thread 7 is at the limit of self-locking of approximately 6 °.
  • the inner wall of the inner tube 3 is deformed in a wave-like manner by the thread rolling, the wave crest of the thread base 9 and the wave trough of the thread head 10 being opposite.
  • the thread depth t is approximately equal to the residual wall thickness a in the thread root 9.
  • the width b of the thread head 10 corresponds approximately to one and a half times the wall thickness a. An optimal load-bearing capacity is thus achieved overall. Not only is the thread depth equal to the remaining wall thickness in the thread base.
  • the shear surface of the thread flank is also matched to the surface pressure of the thread flank.
  • the length of the entire spindle support 1 is adjusted by means of a swivel nut 11. This lies on the upper end of the outer tube 2 and is via radial webs 12, which are located on the outer wall of the outer tube Support 2, stored securely. Diametrically opposite handles 13 arranged on the lateral surface of the vertebral nut 11 serve to facilitate rotation of the vertebral nut 11.
  • the swivel nut 11 is rotated, the inner tube 3 moving out of or into the outer tube 2.
  • the maximum length of the spindle support 1 is defined as shown in Figure 4.
  • the stop shoulder 8 of the inner tube 3 is supported on the stop webs formed by the beads 6 of the outer tube 2. A further unscrewing of the inner tube 3 is not possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Prostheses (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Surgical Instruments (AREA)
  • Sliding-Contact Bearings (AREA)
  • Toys (AREA)
  • Fluid-Damping Devices (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Claims (4)

  1. Etai à broche (1) composé de deux tubes (tube extérieur 2, tube intérieur 3) déplaçables télescopiquement l'un par rapport à l'autre, en particulier tubes en acier, avec un filetage extérieur (7) réalisé sur un tube intérieur (3), sur lequel passe un écrou de réglage (écrou à créneaux 11), le filetage extérieur (7) étant obtenu par laminage, caractérisé en ce que le tube intérieur est à paroi mince et en ce que, dans le cas d'une ouverture des flans de filet sous un angle d'à peu prés 80 à 90° la profondeur de filet (t) est à peu près égale à l'épaisseur de paroi résiduelle (a) au fond de filet, ceci pour une forme de filetages en totalité à peu près trapézoïdale.
  2. Etai à broche selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que le rapport entre le diamètre et l'épaisseur de paroi du tube intérieur (3) est d'à peu près 18.
  3. Etai à broche selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'angle d'hélice du filet (7) est situé à la limite de l'auto-blocage.
  4. Etai à broche selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que le tube intérieur (3) est réalisé en acier de construction.
EP91110718A 1990-09-01 1991-06-28 Etançon à filetage Expired - Lifetime EP0473894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4027739 1990-09-01
DE4027739A DE4027739C1 (fr) 1990-09-01 1990-09-01

Publications (2)

Publication Number Publication Date
EP0473894A1 EP0473894A1 (fr) 1992-03-11
EP0473894B1 true EP0473894B1 (fr) 1994-11-30

Family

ID=6413392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91110718A Expired - Lifetime EP0473894B1 (fr) 1990-09-01 1991-06-28 Etançon à filetage

Country Status (5)

Country Link
EP (1) EP0473894B1 (fr)
AT (1) ATE114771T1 (fr)
DE (2) DE4027739C1 (fr)
DK (1) DK0473894T3 (fr)
ES (1) ES2064815T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720429B1 (fr) * 1994-05-31 1996-08-14 Travaux Ste Moderne Grands Garde-corps pour fermer provisoirement une baie d'un bâtiment.
DE10132253B4 (de) * 2001-07-04 2005-10-27 Doka Industrie Gmbh Außen- oder Ständerrohr einer axial verstellbaren Vorrichtung sowie höhenverstellbare Stütze
DE10228479B4 (de) 2002-06-26 2004-06-09 Peri Gmbh Stütze für den Baubereich
ES2304901B1 (es) * 2008-04-09 2009-05-21 Sistemas Tecnicos De Encofrados, S.A. Puntal para obras.
DE102016204694A1 (de) * 2016-03-22 2017-09-28 Peri Gmbh Gerüstelement mit einem Trägerkopf und Baugerüst mit einem solchen Gerüstelement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1310595A (fr) * 1961-10-16 1962-11-30 Perfectionnements aux étais réglables pour coffrages et analogues
DE3445657A1 (de) * 1984-12-14 1986-06-26 Friedr. Ischebeck GmbH, 5828 Ennepetal Baustuetze

Also Published As

Publication number Publication date
EP0473894A1 (fr) 1992-03-11
DE59103653D1 (de) 1995-01-12
ATE114771T1 (de) 1994-12-15
DK0473894T3 (da) 1995-05-08
DE4027739C1 (fr) 1991-10-24
ES2064815T3 (es) 1995-02-01

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