US3844223A - Safety device for a skilift - Google Patents

Safety device for a skilift Download PDF

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Publication number
US3844223A
US3844223A US00308584A US30858472A US3844223A US 3844223 A US3844223 A US 3844223A US 00308584 A US00308584 A US 00308584A US 30858472 A US30858472 A US 30858472A US 3844223 A US3844223 A US 3844223A
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United States
Prior art keywords
rope
safety device
skilift
track
skier
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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
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US00308584A
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English (en)
Inventor
R Brian
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.)
Poma SA
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Pomagalski SA
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Publication date
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Publication of US3844223A publication Critical patent/US3844223A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61BRAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B12/00Component parts, details or accessories not provided for in groups B61B7/00 - B61B11/00
    • B61B12/06Safety devices or measures against cable fracture

Definitions

  • the Safety device Permits the detection of a Crossing of the end of a skilift track, and it includes a rope 52 US. Cl. ..104/'17"3, 104/178, 104/179 Stretched between two fixed Points, the ihfleXiOh 0f [51 1m. (:1 B6lb 11/02 P constituting the Sight" that the hmh has been 58 Field of Search 104 173 R, 173 ST, 178, passed- The ihflexhm of the rope is detected by the pivoting of winding drums on which are wound the ends of the rope.
  • the invention relates to a safety device, in particular for the end of a skilift track for purposes of signalling and/or bringing about the stopping of the skilift should a skier pass beyond the end of the track.
  • Safety devices which bring about the stopping of the lift when a skier, towed by the towhanger, goes beyond a predetermined limit, in order to prevent the towing of the skier around the terminal sheave of the skilift, and possibly in the downhill direction.
  • the systems known necessitate a personal intervention to reset the device and so permit the restarting of the lift, and thus cannot be used in the case of an installation run by a single operator, who is usually at the departure terminal.
  • the object of the present invention is to remedy this disadvantage and to permit the realizing of a particularly simple safety system, functioning automatically, and reliable.
  • a barrier installed at the end of the track, is advantageously constituted by a single wire or rope strained between two posts, and capable of extending in length, either by reason of its own elasticity or by means of winding reels.
  • a skier comes into contact with the rope, this is dragged forward by the movement of the skier and takes the form of a V, by extending elastically.
  • a sensor that is sensitive to a change in the direction of the rope, or to its extension or to an analogous modification, brings about the signalling of the said crossing, and possibly the automatic stopping of the skilift.
  • Another object of the invention is the realizing of a safety device not affected by snowfalls and easily adapted to the depth of the snow.
  • the height of the rope is adapted to the level of the snow.
  • Another object of the invention is to permit an appreciable extension of the barrier rope and avoid any friction on the body of the skier in contact.
  • two reels are used on each of which is wound one of the ends of the rope, so as to make available a considerable stock of rope, and ensure a certain stopping of the lift, whilst avoiding any slipping of the rope on the skier.
  • a sensor is associated with each reel, electrically connected in series with the safety circuit of the lift, so as to bring about the stopping of the lift on the opening of one of the contacts associated with the sensors.
  • the safety device according to the invention may of course be used for the detection of the crossing of any limit, for example that of a prohibited zone.
  • the rope may be installed in a broken line demarcating the prohibited zone the crossing of which must be signalized or must cause the stopping of the installation.
  • FIG. 1 is a schematic plan view of the end of a skilift equipped with an end-of-track safety device according to the invention
  • FIG. 2 is a fragmentary view in elevation, showing partly broken away the fixing system of the rope and associated reel;
  • FIG. 3 is a view analogous with that of FIG. 1, illustrating a modified type of the installation
  • FIG. 4 is a view analogous with that of FIG. 2, showing a variation of the sensor.
  • FIG. 1 an overhead cable 10, of a transport installation of the skilift type l2passes around a terminal sheave 14 at the end of the track on which are towed the skiers.
  • a safety device 16 In front of the terminal sheave 14, in relation to the direction of travel of cable 10, shown by an arrow in the figure is installed a safety device 16 defining the end of the towing track.
  • the towed skiers generally leave or release the towhanger (not shown) before reaching the safety device, which thus does not intervene under normal working conditions.
  • Safety device 16 detects, on the contrary, the passing of a skier caught on the towhanger, for example, and causes the stopping of the skilift.
  • Safety device 16 has a rope or wire 18 stretched between two posts 20, 22 on each side of the trajectory of cable 10, and preferably perpendicular to the trajectory.
  • Each end of the rope 18 is wound on a reel 24 of a winder 26, 28 the case of which is fitted so as to pivot on a vertical spindle 30, fixed on the post 20, 22 respectively (see FIG. 2).
  • Winders 26, 28 are both provided with an elastic return system, for example a spiral spring (not shown) tending to wind rope 18 on reels 24. It is easily seen that the rope 18 is thus stretched be tween posts 20, 22 and can in case of being reached or engaged by a skier be deviated to reach the position in the form of a V, shown by a dotted line in FIG.
  • the fixing of the winders 26, 28 respectively on posts 20, 22 is advantageously effected by means of a clamp 32 designed to slide on the pole, and with a locking screw 34 to permit the adjustment of the height of the rope in case of variation of the thickness of the layer of snow.
  • each winder 26, 28 is associated a detector, shown schematically in FIG. 1 by an electrical contact respectively 36, 38 actuated by a cam or trigger respectively 40, 42 fixed to winder 26, 28.
  • contacts 36, 38 are in the closed position and are electrically connected in series with the skilift safetey line.
  • the safety line (not shown) extends over the whole length of the skilift and is connected to a signal and control device installed in the drive termi nal of the installation.
  • cable derailment detectors or other safety devices are inserted in the safety line and the signal device permits the location of the fault.
  • the interruption of the safety line brings about the automatic stopping of the installation.
  • Cams 40, 42, carried by winders 26, 28, are so designed as to open contacts 36, 38 in the case of the pivoting of winders 26, 28 corresponding with the inflexion or movement of rope 18 towards the position indicated by a dotted line in FIG. I. It is easily seen that once a skier is freed from the rope this automatically returns to the taut rest position under the action of winders 26, 28, the corresponding pivoting of the winders freeing contacts 36, 38 which close automatically.
  • Downwards safety device 16 in relation to the direction of movement of the cable, for example after sheave 14 has been passed, is a second safety device 44, consisting for example of a gate 46, the pivoting of which causes the opening of a detector or contact 48, bringing about the stopping of the lift and necessitating an on-the-spot intervention.
  • a second safety device 44 consisting for example of a gate 46, the pivoting of which causes the opening of a detector or contact 48, bringing about the stopping of the lift and necessitating an on-the-spot intervention.
  • the safety device described functions in the following manner:
  • Skiers towed by overhead cable let go the towhanger before reaching the end of the track indicated, apart from other means by rope 18, which bars the track transversely.
  • the freed towhangers are retracted by means of their elastic system and normally pass above rope 18.
  • a skier who accidentally remains with his towhanger continues his travel and when he crosses the end of the track drags rope 18, which unwinds from the reels 24 taking a bent or inclined position, shown by a dotted line in H6. 1.
  • the inclination of the two ends of the rope brings about that of winders 26, 28, cams 40, 42 of which engage the triggers opening contacts 36, 38. When one of these contacts is opened the motor (not shown) of the installation is automatically stopped as a result of the interruption of the safety line.
  • a signal device of some kind indicates the functioning of the end-of-track detector 16, and while the lift is stopped the skier may free himself from the towhanger.
  • On leaving the track he frees rope l8 and the winders, under the action of their springs, automatically return the rope to its taut position in which winders 26, 28 permit the re-closing of contacts 36, 38 thus renewing the continuity of the safety line.
  • the skilift supervisor is advised of this return to its position of the end of track safety device by the disappearance of the alarm signal, and he can start the installation once more, preferably at reduced speed.
  • the safety of the installation is increased by the presence of the second detector 44, the object of which is to bring the installation to a halt in the unlikely case of inefficient functioning of barrier 18.
  • a skier could free himself from barrier 18 before freeing himself from the towhanger and the supervisor, thinking that the incident has been eliminated, could start the lift again thus dragging the skier once more.
  • the skier comes into contact with gate 46 and bring about through the opening of contact 48 the stopping of the installation thus necessitating an on-thespot intervention.
  • the second safety device 44 is of course in no way indispensable, and the same function may be realized in any other manner, for example with a simple wire, the breaking of which would bring the installation to a stop, or by a barrier system of the type described above.
  • the system with two winders 26, 28, illustrated in FIG. 1, makes it possible to avoid any rubbing of rope 18 on the skier, as it is unwound from the two winders.
  • a good length of rope 18 is available, permitting a considerable deflection and thus the certain stopping of the installation.
  • the barrier could be devised in some other manner, for example using a net or articulated components and that the stretching of the rope could result from its own elasticity or from some other elastic system well known in itself.
  • the actuating of detectors 36, 38 may be different, in particular by means of a system acted on directly by the rope 18 on reaching an inclined position, or by some analogous system.
  • FIG. 3 illustrates an end of track device 16, analogous with that of FIG. 1, combined with a device 17 delimiting a prohibited zone.
  • the same reference numbers designate parts identical with or analogous with those of FIG. 1.
  • Rope l8 strained across the trajectory of overhead cable 10 passes over an idler wheel and extends over a trajectory parallel with that of cable 10 before being fixed to post 20.
  • Part 52 of rope l8 strained between idler wheel 50 and post 20 delimits the prohibited zone between the uphill and downhill sides of overhead cable 10, and prevents skiers from approaching the inner part of the skilift, that is to say towards the left in FIG. 3.
  • the detection of the action of rope 18 may be effected in some other manner, for example in that shown in FIG. 4, by the opening of a contact 54 on the rotation of reel 24 of the winder.
  • the rotation of reel 24 is detected by a crank 56 which is an easy fit on spindle 58 of reel 24.
  • a rotation of reel 24 in the clockwise direction in FIG. 4, corresponding to the unwinding of rope 18, moves by friction crank 56, which strikes the trigger of contact 54 and causes its opening.
  • Contact 54 is inserted in the usual way and brings about the stopping of the skilift.
  • the crank 56 contact 54 system is so devised as to remain in the open position as long as no unwinding of the rope 18 has commenced.
  • the system according to FIG. 4 is sensitive to any unwinding of rope 18, that is to say to any lengthening of the rope which may be extended following a polygonal contour defined by idler wheels or over long distances.
  • the unwinding of rope 18 may also be detected by a device actuated directly by rope 18, for example by friction or by an extra thickness of part of the rope coming into contact with any kind of control system.
  • the lengthening of rope 18 is accompanied by an increase in its tension, which may be detected in a usual manner, for instance by an extensometer inserted in the rope. This increase in tension may serve as a signal that the safety barrier has functioned.
  • a safety device for protecting skiers said safety device extending transversely of said tow track proximate said tow track end to detect crossing of said end by a skier, said safety device comprising:
  • said safety device further comprises fixing means for pivotally securing each said winding means to its respective anchor point, for pivoting about a vertical axis, the safety device further comprising means for detecting pivoting of said winding means.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
US00308584A 1971-12-08 1972-11-21 Safety device for a skilift Expired - Lifetime US3844223A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7144144A FR2163987A5 (cs) 1971-12-08 1971-12-08

Publications (1)

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US3844223A true US3844223A (en) 1974-10-29

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US00308584A Expired - Lifetime US3844223A (en) 1971-12-08 1972-11-21 Safety device for a skilift

Country Status (9)

Country Link
US (1) US3844223A (cs)
JP (1) JPS4864653A (cs)
AT (1) AT325675B (cs)
CA (1) CA1011426A (cs)
CH (1) CH564444A5 (cs)
DE (1) DE2256458C2 (cs)
ES (1) ES408939A1 (cs)
FR (1) FR2163987A5 (cs)
IT (1) IT975905B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003314A (en) * 1975-04-25 1977-01-18 Pearson William F Ski lift monitoring
US5099223A (en) * 1989-10-11 1992-03-24 Araujo Vincent De Safety device, in particular a safety gate, which can be activated by a moving body
US5363316A (en) * 1992-06-15 1994-11-08 Spencer Paul W Maintenance monitoring system for detachable ski lift carrier vehicles
US6152044A (en) * 1995-12-14 2000-11-28 Montagner Sa Skier towing system
CN103057547A (zh) * 2012-12-19 2013-04-24 山东省科学院自动化研究所 往复式索道钢绳缠绕故障检测方法及装置
US11332166B2 (en) * 2017-06-12 2022-05-17 Innova Patent Gmbh Cableway with lock monitoring for a vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2894918B1 (fr) * 2005-12-15 2008-02-29 Pomagalski Sa Dispositif de securite pour une installation de transport a cable

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209703A (en) * 1963-10-23 1965-10-05 John P Brebner Ski lift safety device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1461487A (fr) * 1965-09-16 1966-02-25 Pomagalski Jean Sa Dispositif de sécurité en fin de piste, notamment pour remonte-pente
CH470281A (it) * 1966-01-18 1969-03-31 Ermete Taccon Danizzo Ego Apparecchiatura portatile per il traino di sciatori in montagna
FR1530686A (fr) * 1967-05-19 1968-06-28 Installation de départ d'un dispositif de remorquage de skieurs

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209703A (en) * 1963-10-23 1965-10-05 John P Brebner Ski lift safety device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003314A (en) * 1975-04-25 1977-01-18 Pearson William F Ski lift monitoring
US5099223A (en) * 1989-10-11 1992-03-24 Araujo Vincent De Safety device, in particular a safety gate, which can be activated by a moving body
US5363316A (en) * 1992-06-15 1994-11-08 Spencer Paul W Maintenance monitoring system for detachable ski lift carrier vehicles
US6152044A (en) * 1995-12-14 2000-11-28 Montagner Sa Skier towing system
CN103057547A (zh) * 2012-12-19 2013-04-24 山东省科学院自动化研究所 往复式索道钢绳缠绕故障检测方法及装置
CN103057547B (zh) * 2012-12-19 2015-06-03 山东省科学院自动化研究所 往复式索道钢绳缠绕故障检测方法及装置
US11332166B2 (en) * 2017-06-12 2022-05-17 Innova Patent Gmbh Cableway with lock monitoring for a vehicle

Also Published As

Publication number Publication date
ATA982772A (de) 1975-01-15
FR2163987A5 (cs) 1973-07-27
JPS4864653A (cs) 1973-09-06
ES408939A1 (es) 1975-10-16
CA1011426A (fr) 1977-05-31
CH564444A5 (cs) 1975-07-31
DE2256458A1 (de) 1973-06-14
AT325675B (de) 1975-11-10
DE2256458C2 (de) 1983-12-08
IT975905B (it) 1974-08-10

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