EP1544475A2 - Teleskopzylinder - Google Patents

Teleskopzylinder Download PDF

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Publication number
EP1544475A2
EP1544475A2 EP04029638A EP04029638A EP1544475A2 EP 1544475 A2 EP1544475 A2 EP 1544475A2 EP 04029638 A EP04029638 A EP 04029638A EP 04029638 A EP04029638 A EP 04029638A EP 1544475 A2 EP1544475 A2 EP 1544475A2
Authority
EP
European Patent Office
Prior art keywords
section
telescopic cylinder
intermediate section
slidably mounted
choke element
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.)
Withdrawn
Application number
EP04029638A
Other languages
English (en)
French (fr)
Other versions
EP1544475A3 (de
Inventor
Gianfranco Natali
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1544475A2 publication Critical patent/EP1544475A2/de
Publication of EP1544475A3 publication Critical patent/EP1544475A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type

Definitions

  • the present invention relates to a telescopic cylinder of the type described in the preamble to claim 1.
  • the present invention is designed in particular for cylinders used for tipping the bodies of industrial vehicles, that is to say, single-acting hydraulic telescopic cylinders, to which specific reference is made below.
  • the present invention may also be applied to different types of telescopic cylinders, used in various sectors, but for which similar performance is required.
  • the innermost sections have a very small diameter and therefore form inside them a chamber for the operating fluid with a volume significantly smaller than the outermost sections.
  • This configuration is a significant disadvantage during the descent of the body.
  • the operator uses a special control to disable the pump that maintained the operating fluid pressure and to open a discharge valve which puts the telescopic cylinder in direct communication with the fluid tank.
  • the sudden descent of the body may be dangerous for people close to the body.
  • the technical need of the present invention is to provide a telescopic cylinder that guarantees a "soft" descent, without rebound, for all of its sections, in particular the innermost sections, but which at the same time guarantees descent of the outermost sections that is sufficiently fast and safe.
  • the numeral 1 denotes as a whole a telescopic cylinder according to the present invention, which has a cylindrical shape in the accompanying drawings.
  • the telescopic cylinder 1 disclosed comprises an outer section 2 one or more intermediate sections 3, and an inner section 4.
  • the outer section 2 is hollow and may be fixed to the chassis of a vehicle. It is also fitted, normally on its outer wall 5, with a connector 6 that allows it to be connected to a pump which supplies a pressurised operating fluid. In addition, the outer section 2 has an inner end 7 closed by an end wall 8, and an open outer end 9.
  • the intermediate section 3 is also hollow and is slidably mounted inside the outer end 9 of the outer section 2, and has an inner end 10 and an outer end 11, both open.
  • the inner section 4 is, in turn, slidably mounted inside the intermediate section 3 and advantageously consists of a solid cylindrical rod.
  • Both the intermediate section 3 and the inner section 4 are mobile between a retracted position in which they are substantially inserted in the section in which they are slidably mounted (respectively the outer section 2 and the intermediate section 3), and an extended position in which they project outwards from the section in which they are slidably mounted (again respectively the outer section 2 and the intermediate section 3 - Figure 3).
  • the telescopic cylinder 1 comprises a plurality of intermediate sections 3 telescopically mounted one inside the other.
  • At least one of the intermediate sections 3 is fitted, close to its inner end 10, with at least one choke element 12.
  • the choke element 12 forms an opening 13 which allows communication between the inside of the intermediate section 3 and the inside of the outer section 2, with a gap for passage of the operating fluid smaller than the gap inside the intermediate section 3 itself.
  • the choke element 12 is an obstacle to the fluid emptying from the intermediate section 3, and so slows at least the inner section 4 return to the retracted section.
  • the choke element 12 consists of a separator 14 which closes the inner end 10 of the intermediate section 3 to which it is applied, the separator 14 having at least one through-hole 15 which allows communication between the inside of the intermediate section 3 and the inside of the outer section 2.
  • the size of the through-hole 15 made in the separator 14 must on each occasion be proportionate to the volume of the intermediate section 3 to which the separator 14 is applied. For example, as the volume of the intermediate section 3 increases, the size of the through-hole 15 may also be increased, as illustrated for example in Figure 3, for the different intermediate sections 3.
  • the separators 14 are preferably applied at least to one or more of the innermost intermediate sections 3 so as to exert a braking action on their descent.
  • each outer end 7, 9 of the different sections 2, 3 is fitted with a seal 16 which allows the section 3, 4 inserted inside it to slide, guaranteeing a seal for the operating fluid.
  • Operation of the cylinder 1 disclosed is conventional as regards the extension step in which a pump injects pressurised operating fluid into the cylinder 1 through the special connector 6.
  • the present invention brings important advantages, since the telescopic cylinder disclosed guarantees a "soft" descent, without rebound, of all of its sections, in particular the innermost ones, but at the same time also guarantees descent of the outermost sections that is sufficiently fast and safe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Actuator (AREA)
EP04029638A 2003-12-18 2004-12-15 Teleskopzylinder Withdrawn EP1544475A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR20030140 ITVR20030140A1 (it) 2003-12-18 2003-12-18 Martinetto telescopico.
ITVR20030140 2003-12-18

Publications (2)

Publication Number Publication Date
EP1544475A2 true EP1544475A2 (de) 2005-06-22
EP1544475A3 EP1544475A3 (de) 2005-08-10

Family

ID=34509535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04029638A Withdrawn EP1544475A3 (de) 2003-12-18 2004-12-15 Teleskopzylinder

Country Status (2)

Country Link
EP (1) EP1544475A3 (de)
IT (1) ITVR20030140A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2511745A (en) * 2013-03-11 2014-09-17 Jonic Engineering Ltd Telescopic hydraulic piston arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319344A1 (de) * 1973-04-17 1974-11-07 Jungheinrich & Co Maschf Doppeltwirkende teleskop-zylinderkolbenvorrichtung
DE3744084A1 (de) * 1987-12-24 1989-07-13 Bochumer Eisen Heintzmann Wegmesseinrichtung fuer einen mehrfachteleskopzylinder
DE19608115A1 (de) * 1996-03-02 1997-09-04 Hammelmann Paul Maschf Verfahren zum Messen des Hubes einer Kolben-Zylinder-Einheit, vorzugsweise eines Teleskopzylinders
AU2003216539A1 (en) * 2002-03-05 2003-09-22 Parker Hannifin Corporation Bleederless telescopic cylinder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2511745A (en) * 2013-03-11 2014-09-17 Jonic Engineering Ltd Telescopic hydraulic piston arrangement
GB2511745B (en) * 2013-03-11 2017-05-03 Jonic Eng Ltd Telescopic hydraulic piston arrangement

Also Published As

Publication number Publication date
ITVR20030140A1 (it) 2005-06-19
EP1544475A3 (de) 2005-08-10

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