EP1577252A1 - Laufkatze - Google Patents

Laufkatze Download PDF

Info

Publication number
EP1577252A1
EP1577252A1 EP05396011A EP05396011A EP1577252A1 EP 1577252 A1 EP1577252 A1 EP 1577252A1 EP 05396011 A EP05396011 A EP 05396011A EP 05396011 A EP05396011 A EP 05396011A EP 1577252 A1 EP1577252 A1 EP 1577252A1
Authority
EP
European Patent Office
Prior art keywords
crane carriage
profiled beam
overload
gap
carriage system
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.)
Granted
Application number
EP05396011A
Other languages
English (en)
French (fr)
Other versions
EP1577252B1 (de
Inventor
Juha Erikkilä
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.)
Erikkila Nostotekniikkaa Oy
Original Assignee
Erikkila Nostotekniikkaa Oy
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 Erikkila Nostotekniikkaa Oy filed Critical Erikkila Nostotekniikkaa Oy
Publication of EP1577252A1 publication Critical patent/EP1577252A1/de
Application granted granted Critical
Publication of EP1577252B1 publication Critical patent/EP1577252B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C11/00—Trolleys or crabs, e.g. operating above runways
    • B66C11/02—Trolleys or crabs, e.g. operating above runways with operating gear or operator's cabin suspended, or laterally offset, from runway or track
    • B66C11/04—Underhung trolleys
    • B66C11/06—Underhung trolleys running on monorails

Definitions

  • the present invention relates to a crane carriage system as defined in the preamble of claim 1.
  • a prior-art crane carriage system as illustrated in Fig. 1 is used e.g. in various micro-crane and portal robot systems.
  • the system comprises a profiled beam 1, which is suspended with respect to a structure 2 above it.
  • the profiled beam 1 has a hollow interior space 3. Inside the profiled beam 1 are substantially horizontal bearing surfaces 4 and 5. Between the bearing surfaces 4 and 5 is a downwards-opening gap 6.
  • the system further comprises a crane carriage 7.
  • the crane carriage 7 comprises a frame 8.
  • the frame 8 comprises an inner frame part 9 with at least one pair of wheels 10, 11 rotatably mounted on it, said wheels being substantially aligned with each other and movable on the bearing surfaces 4, 5 on opposite sides in the interior space 3 in the profiled beam 1.
  • the frame 8 also comprises a lower frame part 12 extending below the profiled beam 1 through the gap 6, to which lower frame part a load 13 to be lifted and/or moved can be connected. The weight of the load 13 is transmitted by the frame 8 of the crane carriage 7 to the wheels 10, 11 and thus further to the bearing surfaces 4 and 5 of the profiled beam.
  • the problem is that, in an overload situation when the crane carriage 7 is subjected to an overload, the gap 6 of the profiled beam 1 tends to open and widen, so that there arises a risk of the crane carriage 7 falling down off the profiled beam 1 and causing a hazard.
  • the object of the invention is to overcome the above-mentioned drawbacks.
  • a specific object of the invention is to disclose a crane carriage system wherein the crane carriage is prevented from falling off the profiled beam supporting it when the system is subjected to an overload, so that work safety can be improved and workplace accidents prevented.
  • the crane carriage system of the invention is characterized by what is disclosed in claim 1.
  • the system comprises an overload guard, which is fastened to the outer frame part to prevent expansion of the gap beyond a predetermined value so that the crane carriage is prevented from falling off the profiled beam supporting it.
  • the invention provides the advantage that, in an overload situation, the crane carriage can never fall off the profiled beam supporting it, which means that good work safety is achieved and workplace accidents of this nature are prevented.
  • the overload guard of the invention can be added to all crane carriage systems, both to new systems and systems already in use by installing it as a retrofit.
  • the overload guard comprises two jaws forming a mouth between them which encloses the lower part of the profiled beam inside it with a clearance.
  • the jaws In an overload situation, when the lower part of the profiled beam expands and the gap widens to a predetermined width, corresponding to the width of the mouth, the jaws come into contact and engagement with the profiled beam, thus limiting the expansion of the gap.
  • the crane carriage can no longer be moved. At the same time this is a sign telling the user that an overload has occurred.
  • the overload guard is a solid plate-like piece of continuos material with the jaws placed at a fixed distance from each other.
  • the overload guard comprises a first part with a first jaw and a second part with a second jaw.
  • the second part has been fitted to be substantially irreversibly movable to a limited extent with respect to the first part in an overload situation.
  • the first part is fastened to the outer frame part of the crane carriage.
  • the second part is fastened by a bolt-and-nut joint to the first part so that the second part can turn about the pivotal axis formed by the bolt-and-nut joint.
  • the fixed first part comprises a pin placed at a distance from the pivotal axis
  • the turnable second part comprises a curved elongated hole to receive the pin into it and to limit the movement between the first and the second parts.
  • the overload guard comprises an indicator which is arranged to indicate an overload having occurred.
  • the indicator makes it possible for the maintainer of the system to establish afterwards that the system has been exposed to an overload.
  • the indicator comprises a breakable means, such as a string, seal or the like, which is easily broken in an overload situation.
  • the breakable means forms a bond between the first part and the second part.
  • Fig. 2 presents a crane carriage system which comprises an elongated profiled beam 1 suspended from a fixed structure 2 above it.
  • the profiled beam 1 may be fastened to the fixed structure 2 either directly or indirectly.
  • An example of indirect suspension is a portal crane application, wherein the profiled beam 1 may also be a movable portal beam secured at either end to crane carriages which again can be moved while supported and guided by two profiled beams extending perpendicularly relative to the portal beam and secured to a fixed structure.
  • the profiled beam 1 is a box-like beam having a hollow interior space 3 inside it.
  • the substantially horizontal bearing surfaces 4, 5 of the profiled beam 1 support the wheels 10 and 11 of the crane carriage. Between the bearing surfaces 4, 5 is a gap 6 extending through the whole length of the profiled beam 1.
  • the profiled beam 1 supports the crane carriage 7, which comprises a frame 8, which comprises an inner frame part 9 with two pairs of wheels 10, 11 rotatably secured to it one after the other, the wheels in each of the two wheel pairs being mounted substantially in alignment with each other on the same axis on opposite sides of the inner frame part in the interior space 3 of the profiled beam 1.
  • the wheels 10, 11 roll along the bearing surfaces 4, 5 and are supported by these.
  • That part of the frame 8 which extends below the profiled beam 1 through the gap 6 is called here the outer frame part 12.
  • a hoist (not shown) which can be used to lift a load so as to allow it to be then moved by means of the crane carriage along the path defined by the profiled beam.
  • an overload guard 14 Secured to the outer frame part 12 is an overload guard 14, which in an overload situation prevents expansion of the gap 6 beyond a predetermined value, thus preventing the crane carriage from falling off the profiled beam 1 supporting it.
  • the overload guard 14 is a single solid plate-like piece of continuos material with two jaws 15, 16 made in them at a fixed distance from each other and forming between them a mouth 17 which encloses the lower part of the profiled beam 1 inside it with a clearance.
  • the jaws 15, 16 come into contact and engagement with the flanges 24, 25 in the lower part of the profiled beam 1, thus limiting the expansion of the gap 6.
  • the crane carriage will stop in place and can not be moved before the overload has been removed.
  • the profiled beam may have no horizontal flanges 24, 25 but still has flanges 26, 27 extending downwards on either side of the gap 6.
  • the width of the mouth 17, i.e. the distance between the jaws 15, 16, is so fitted that in an overload situation the jaws 15, 16 will engage the outer sides of the flanges 26, 27.
  • Fig. 3 shows that the overload guard 14 is fastened preferably by a bolt-and-nut joint to one end of the outer part 12 of the frame 8 of the crane carriage 7.
  • the embodiment presented in Fig. 4 and 5 differs from the system of Fig. 2 and 3 only in respect of the structure of the overload guard 14.
  • the overload guard 14 consists of two separate parts, a first part 18 and a second part 19.
  • the first part 18 has a first jaw 15.
  • the second part 19 has second jaw 16.
  • the second part 19 has been fitted to be substantially irreversibly movable to a limited extent with respect to the first part 18 in an overload situation, in other words, the jaws 15 and 16 move a little away from each other.
  • the first part 18 is fastened to the outer frame part 12 of the crane carriage 7.
  • the second part 19 is connected to the first part 18 by a bolt-and-nut joint 20 so that the second part 19 can turn about the rotational axis 1 formed by the bolt-and-nut joint.
  • the first part 18, which is fixed with respect to the frame, comprises a pin 21 located at a distance from the rotational axis 1, and the second part 19 comprises a curved elongated hole 22 to receive the pin 21 into it and to limit the movement between the first and the second parts.
  • the overload guard 14 also allows the overload guard 14 to be provided with an indicator 23 that will indicate the occurrence of an overload.
  • the indicator may preferably of a breakable type and form between the first part 18 and the second part 19 a bond that will easily break in an overload situation.
  • the indicator 23 may be e.g. a string, a seal or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
  • Jib Cranes (AREA)
  • Chain Conveyers (AREA)
  • Vehicle Body Suspensions (AREA)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
EP05396011A 2004-03-18 2005-03-17 Laufkatze Not-in-force EP1577252B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20040419A FI115965B (fi) 2004-03-18 2004-03-18 Juoksuvaunujärjestelmä
FI20040419 2004-03-18

Publications (2)

Publication Number Publication Date
EP1577252A1 true EP1577252A1 (de) 2005-09-21
EP1577252B1 EP1577252B1 (de) 2009-12-02

Family

ID=32039438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05396011A Not-in-force EP1577252B1 (de) 2004-03-18 2005-03-17 Laufkatze

Country Status (4)

Country Link
EP (1) EP1577252B1 (de)
AT (1) ATE450474T1 (de)
DE (1) DE602005017959D1 (de)
FI (1) FI115965B (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1956894U (de) * 1966-10-26 1967-03-09 Abus Foerdertechnik K G Fahrwerk fuer laufkatzen od. dgl.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1956894U (de) * 1966-10-26 1967-03-09 Abus Foerdertechnik K G Fahrwerk fuer laufkatzen od. dgl.

Also Published As

Publication number Publication date
FI115965B (fi) 2005-08-31
ATE450474T1 (de) 2009-12-15
DE602005017959D1 (de) 2010-01-14
EP1577252B1 (de) 2009-12-02
FI20040419A0 (fi) 2004-03-18

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