EP0135239B1 - Progressive Zugkraftvorrichtung mit zentrifugalbremse für Skilifte - Google Patents

Progressive Zugkraftvorrichtung mit zentrifugalbremse für Skilifte Download PDF

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Publication number
EP0135239B1
EP0135239B1 EP84201262A EP84201262A EP0135239B1 EP 0135239 B1 EP0135239 B1 EP 0135239B1 EP 84201262 A EP84201262 A EP 84201262A EP 84201262 A EP84201262 A EP 84201262A EP 0135239 B1 EP0135239 B1 EP 0135239B1
Authority
EP
European Patent Office
Prior art keywords
shoe
gasket
drum
centrifugal brake
casing
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
EP84201262A
Other languages
English (en)
French (fr)
Other versions
EP0135239A2 (de
EP0135239A3 (en
Inventor
Hans Günter Czaloun
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.)
Leitner AG
Original Assignee
Leitner AG
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 Leitner AG filed Critical Leitner AG
Priority to AT84201262T priority Critical patent/ATE51594T1/de
Publication of EP0135239A2 publication Critical patent/EP0135239A2/de
Publication of EP0135239A3 publication Critical patent/EP0135239A3/en
Application granted granted Critical
Publication of EP0135239B1 publication Critical patent/EP0135239B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B11/00—Ski lift, sleigh lift or like trackless systems with guided towing cables only
    • B61B11/004—Means connecting load and cable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B12/00—Component parts, details or accessories not provided for in groups B61B7/00 - B61B11/00
    • B61B12/06—Safety devices or measures against cable fracture

Definitions

  • the present invention relates to a progressively acting hauling device for ski-lifts, and is particularly relating to the centrifugal brake with which the recall device is provided of the rope to which the skier clings.
  • the hauling devices consist of essentially three parts: a joint to the hauling cable, an intermediate connecting element, and a joint for the skier.
  • the intermediate connecting element consists of the rope suitable to be wound on a drum, on which a recall spiral spring is active, as well as of a centrifugal brake, whose purpose is of increasing the force necessary to cause the rope to be unwound, and of preventing a too rapid rewinding of the same, under the action of the said spiral wing.
  • centrifugal brakes for said recall devices. They comprise substantially at least a shoe provided with a high weight mass, said shoe being pivotally connected to the winding drum for the rope, and being kept by the action of a spring at a given distance from the inside cylindrical surface of the casing which encloses the recall device.
  • the brake shoe By turning the winding drum, either in a direction or in the other, whether the rope is drawn from the casing and hence unwound from the drum, or it is recalled into the casing and hence rewound on the drum, the brake shoe is centrifugally pressed against the inside surface of the casing, thus applying its braking force.
  • the shoe(s) of such centrifugal brakes are usually realized as a single formed metal piece, whose mass is high enough to the purpose of exerting the centrifugal force. These shoes undergo oxidation and corrosion by the humidity which can possibly penetrate inside the casing and, mainly after an inactivity period (during the summer) they are exposed to seize up, and to be not any more fully operating upon subsequent restarting of the plant.
  • Each one of these shoes moreover bears a gasket of friction material, which is usually cemented, or otherwise made solid with the metallic body of the shoe. This gasket undergoes wear, and when it is worn down, the whole shoe must be replaced.
  • centrifugal brake has been proposed for hauling devices, provided with at least one shoe consisting of a body moulded from plastics incorporating a metallic mass, on which body a separated gasket is clutched and hence rigidly constrained in a fixed position, of self lubricating plastic material, such gasket being interchangeable, and having the two opposite ends directed towards the turning directions of the shoe pointedly shaped.
  • the gasket of the shoe being a separated component equipped with rapid fastening means, can be easily assembled on the body of the shoe and replaced when it is worn down.
  • the particular shape of the gasket, with its pointed ends, has the purpose of securing the braking action also in the presence of liquid matter inside the casing, which shall be removed by the pointed ends of the gasket, thus eliminating any hydrodynamic lubrication effect (aquaplaning).
  • Purpose of the present invention is therefore of further improving the centrifugal brake for hauling devices according to IT-U-188 866, in order to conclusively solving the problem involved by the so-called "aquaplaning" and to securing the perfect efficiency of the brake even in the presence of water inside the casing, allowing furthermore the braking force to be adapted to specific requirements.
  • a plurality of protruding teeth are formed along the periphery of the shoe, closely to its articulation pin, and the gakset is provided on its rearfacewith a transverse groove suitable to be coupled with one of said teeth, so as to allow limited swinging movings to the gasket, around the coupling tooth, and to achieve a perfect fitting of the gasket to the inside sliding surface of the casing.
  • the penetration of humidity is thus avoided between the braking surfaces, and a more uniform wear is secured of the gaskets.
  • the hauling device comprises in a known manner a casing 11 intended for being connected, e.g., fastened to a hauling cable (not shown) of a ski-lift plant.
  • the casing 11 houses the recall device (not shown) for a rope 12 which goes to the outside through a funnel-form lower orifice 13 of the casing, such rope bearing at its free end a joint 14 for the skier.
  • This recall device comprises in a known way a drum 15forwinding the rope 12, such drum being rotatably mounted on a pivot 16 supported inside the casing 11 and in a cover tightly applied on the casing, and defining a chamber which houses a recall spiral spring fixed at one of its ends to said cover, and at the other end at a hub coupled with said drum 15. This spiral spring tends to rotate the drum 15 in the winding direction of the rope.
  • One side of the winding drum 15 is provided on diametrally opposed positions, with two articulation .pins 20 for two shoes 21 which have their opposite end 22 hooklike shaped, and are loosely hooked to a brake guide 23 mounted on the hub 24 of drum 15.
  • Springs 25 connect the two shoes 21 to each other in order to holding them, under static conditions, spaced apart from the inside cylindrical surface 26 of the casing 11.
  • each shoe 21 consists of a shaped body moulded in one single piece from plastics, said body completely enclosing a metallic mass 27, which confers to the body itself the necessary weight for the centrifugal action.
  • This shaped body moreover is already provided with all functional components, such as in particular the hook 22, a through hole 28 suitable to house the articulation pivot 20, as well as bores 29, 30 for hooking the springs 25.
  • the hole 28 for the pivot 20 communicates with a slit 31 which makes the same hole elastically enlargeable and allows an elastically blocked coupling to be realized with the pin 20, thus securing a silent and smooth operating of the brake.
  • the shoe of plastics bears moreover a gasket 32, which, according to the invention, is mounted on the body of the shoe itself so as to be able to slightly swing and to be easily replaced.
  • this gasket 32 which is made from self lubricating plastic material, is provided on its rear side with two transverse ribs 33 as a single piece, which define between each other a groove intended for being coupled with one from a series of transverse teeth 35 peripherically protruding from the body of plastics of the shoe 21 (see Fig. 2).
  • the coupling between the rear groove of the gasket 32 and the tooth 35 is such as to allow a limited swinging of the gasket around the slightly enlarged and rounded head of the tooth 35, so as to secure during the braking action the perfect fitting of the outside surface of the gasket to the. inside cylindrical surface 26 of the casing 11.
  • the forming is avoided of a hydrodynamic bearing between the braking surfaces, and the phenomenon of "aquaplaning" is avoided.
  • the gasket 32 is additionally provided with two flexible side fins of substantially triangular shape 36 with enlarged free ends 37, whose purpose is of radially holding in position the gasket on the shoe, by acting in cooperation with side shoulders 38 of the shoe itself, without preventing said gaskets from swinging.
  • the transverse teeth 35 are provided on the periphery of the shoe 21 in the nearby of its through hole 28 suitable to house the articulation pivot 20.
  • the presence of such teeth 35 makes it possible to move the gasket 32 from tooth to tooth, thus allowing the braking force to be varied. Indeed, the closer the gasket is mounted to the shoe articulation axis, the larger is the braking force.
  • the operating way of the centrifugal brake described is not different to that of known brakes of this type and a detailed description of it is therefore not necessary.
  • the brake is active in both the turning directions of the winding drum 15, that is to say, when the rope 12 is being extracted from the casing 11 and is unwound from the drum, as well as when the rope 12, due to the action of the recall spring, is returned inside the casing, for being rewound on the drum.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Claims (3)

1. Progressive Zugkraftvorrichtung (10) für Skilifte mit einer Seiltrommel (15) für ein der Einwirkung einer Rückholfeder und einer Zentrifugalbremse unterworfenes Seil (12), wobei die Bremse wenigstens einen Schuh (21) zum Zusammenwirken mit der inneren, zylindrischen Oberfläche (26) eines Gehäuses (11) umfaßt, welches Gehäuses die Trommel (15), die Zentrifugalbremse und die Rückholfeder aufnimmt, wobei der Schuh (21) aus einem aus Kunststoff gegossenen Körper besteht, welcher eine metallische Masse (27) enthält und eine getrennt ausgebildete und aus selbstschmierendem Kunststoff bestehende Dichtung (32) trägt, dadurch gekennzeichnet, daß der Umfang des den Schuh (21) bildenden Körpers mit einer Vielzahl von vorragenden, quer verlaufenden Zähnen (35) nahe seiner Anlenkachse (20) an der Trommel (15) ausgebildet ist, daß die Dichtung (32) an ihrer Rückseite mit zwei quer verlaufenden, vorstehenden und eine zwischenliegende Nut begrenzenden Rippen (33) ausgebildet ist, wobei die Nut wahlweise in Abhängigkeit von der erforderlichen Bremskraft mit einem der Zähne (35) gekoppelt werden kann, so daß es möglich wird, daß die Dichtung (32) begrenzte Schwenkbewegungen um den damit gekoppelten Zahn (35) ausführt, und daß Mittel (36-38) für ein radiales Halten der Dichtung (32) in Position am Körper des Schuhs (21) vorgesehen sind.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel für ein radiales Halten der Dichtung (32) in Position am Körper des Schuhs (21) aus flexiblen, mit der Dichtung (32) einstückig ausgebildeten Seitenlängsrippen (36) bestehen, wobei die Längsrippen (36) eine im wesentlichen dreieckige Form mit verbreiterten, freien Enden (37) aufweisen, welche für ein Zusammenwirken mit Seitenschultern (38) des Körpers des Schuhs (21) geeignet sind.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zähne (35) einen verbreiterten, runden Kopf aufweisen.
EP84201262A 1983-09-16 1984-09-03 Progressive Zugkraftvorrichtung mit zentrifugalbremse für Skilifte Expired - Lifetime EP0135239B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84201262T ATE51594T1 (de) 1983-09-16 1984-09-03 Progressive zugkraftvorrichtung mit zentrifugalbremse fuer skilifte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI1983U22994U IT8322994U1 (it) 1983-09-16 1983-09-16 Freno centrifugo per dispositivo di traino ad azione progressiva per sciovie.
IT2299483U 1983-09-16

Publications (3)

Publication Number Publication Date
EP0135239A2 EP0135239A2 (de) 1985-03-27
EP0135239A3 EP0135239A3 (en) 1986-12-03
EP0135239B1 true EP0135239B1 (de) 1990-04-04

Family

ID=11202665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201262A Expired - Lifetime EP0135239B1 (de) 1983-09-16 1984-09-03 Progressive Zugkraftvorrichtung mit zentrifugalbremse für Skilifte

Country Status (3)

Country Link
EP (1) EP0135239B1 (de)
AT (1) ATE51594T1 (de)
IT (1) IT8322994U1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBZ20030005A1 (it) 2003-01-30 2004-07-31 High Technology Invest Bv Dispositivo pressore per la conduzione di fune in sistemi di trasporto a trazione di fune.
ITBZ20050051A1 (it) 2005-09-29 2007-03-30 High Technology Invest Bv Dispositivo antiscarrucolamento per funi di impianti funiviari.
ITMI20070835A1 (it) 2007-04-20 2008-10-21 Rolic Invest Sarl Impianto di trasporto a fune e metodo di azionamento dello stesso
ITMI20070157U1 (it) 2007-04-20 2008-10-21 Rolic Invest Sarl Seggiovia
ITMI20071618A1 (it) 2007-08-03 2009-02-04 Rolic Invest Sarl Impianto di trasporto a fune e metodo di azionamento dello stesso
ITMI20072071A1 (it) 2007-10-26 2009-04-27 Rolic Invest Sarl Impianto di trasporto a fune e metodo di azionamento dello stesso
IT1395098B1 (it) 2009-07-09 2012-09-05 Rolic Invest Sarl Unita' di trasporto per impianti di trasporto a fune
IT1395737B1 (it) 2009-08-04 2012-10-19 Rolic Invest Sarl Dispostivo di richiamo di un sedile per skilift
IT1401120B1 (it) 2010-07-14 2013-07-12 Rolic Invest Sarl Scambio per impianto di trasporto a fune e impianto di trasporto a fune comprendente tale scambio.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH259639A (de) * 1947-12-03 1949-01-31 Eisen Und Stahlwerke Oehler & Schleppseilbremse für Skilift.
US3587474A (en) * 1968-05-23 1971-06-28 Roehrs Werner Dr Kg Dragline winch for ski tows and the like
AT365132B (de) * 1979-12-24 1981-12-10 Doppelmayr & Sohn Ein- und ausziehvorrichtung fuer schleppseile von schleppliften

Also Published As

Publication number Publication date
EP0135239A2 (de) 1985-03-27
IT8322994U1 (it) 1985-03-16
EP0135239A3 (en) 1986-12-03
IT8322994V0 (it) 1983-09-16
ATE51594T1 (de) 1990-04-15

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