DE2902963A1 - TOW HANGING FOR SKI LIFTS - Google Patents

Description

Sheet y for the letter to the German Patent Office, Munich, ^January 25, 1979

Description with claim for patent and utility model assistance registration dated January 25, 1979, the company Dr. Werner Rohrs KG, 8972 Sonthofen, regarding:

"Towing device for ski lifts"

The invention relates to tow hangers for ski lifts with a cable drum which takes up the tow cable in a spiral shape and which is below the effect of a spiral band spring tensioned for the tow rope draw-in and for the acceleration process of the to towing load, as well as for the continuous retraction of the tow bar is coupled with a braking device.

The task of such tow hangers is to bring the skier up to speed from a standing start without any noticeable impact to accelerate the hoisting rope and to regulate the towing rope in such a way that it is not accelerated jerkily and over the hauling rope strikes.

To meet these requirements, it is known to equip towing hangers, which consist of a cable drum with a spiral towing cable winding and a spiral band spring, with mechanical braking devices in which the brake linings engage directly on a steel brake drum or brake disc. Such brake devices are susceptible to weathering, because upon exposure to moisture and ice formation, the brake pad friction coefficient to provide the braking action = strong change is also known to equip tow-with a braking device, which consists of a flanged gear pump, with the axis of the rope drum or _o the The winding mandrel of the spiral ribbon spring is coupled. When the tow rope is unwound, the gear pump is driven and pumps through an adjustable

-2-

030031/0357

3/7/70 BQ

Dr. Werner Rohrs K. G., 8972 Sonthofen / AIIgäu - "" aGHÖ

Sheet pf for the letter to the German Patent Office, Munich dated January 25, 1979

oil from one chamber to the other. Due to the spiral-shaped tow rope winding, an increase in the speed of the rope drum resp. reaches the gear pump and increases the delivery rate or the oil pressure in the gear pump. The increase in pressure in the gear pump brings about the braking of the cable drum and the jerk-free acceleration of the skier. After the acceleration process, the pump is depressurized. When the tow rope is drawn in, it works the pump in the opposite direction, with the oil flowing back into the other chamber through a larger, adjustable nozzle cross-section and thus under lower pressure. Through change of the nozzle cross-section, the tow rope retraction speed is adjustable.

Such braking devices or gear pumps have the disadvantage that they produce very expensive sand and very high pressures (up to 50 Atü) in the production. In addition, the condensation forms in empty spaces of the pump and freezes to ice, which leads to the failure of the pump.

The invention is based on the object of a ski lift tow hand to create with a braking device that is weather-independent and works pressure-free in an oil bath and easy is to be established.

This object is achieved in that the Mechanical braking device assigned to the cable drum, in particular the brake lining in the existing oil bath of the suspension mainspring works.

030031/0 357

Dr. Werner Rohrs KG _f 8972 Sonthofen / Allgäü

* ϊί U Ä. si O d>

Sheet p, for writing to the German Patent Office, Munich, January 25, 1979

The advantages achieved by the invention are in particular that the braking device works in a closed spring housing in the oil bath of the spiral band spring, whereby the coefficient of friction of the brake lining is kept constant regardless of any weather conditions due to the oil lubrication. Another advantage is that the created mechanical oil bath brake works completely maintenance-free in the already existing oil bath of the spiral band spring and is much less susceptible to failure than oil pressure brakes. Furthermore, no valves are required with the mechanical oil bath brake, since it works completely without pressure. Some exemplary embodiments of the invention are shown in the drawings and are described in more detail below.
Show it:

Figure 1 is a ski lift towing hanger in axial center section, according to the cutting lines C-D with coiled tow rope and pre-tensioned spiral ribbon spring.

FIG. 2 shows a cross section along the section lines A-B with a top view on the combined mechanical oil bath brake with utilization of the torque and the centrifugal force.

Figure 3 shows a cross section through the GEhang with a plan view the torque-dependent mechanical oil bath brake, neglecting the centrifugal force.

The ski lift towing hanger essentially consists of the cable drum 7 with axis 5, the cable drum housing 1 and the spring housing 12 with a mechanical oil bath brake arranged therein from parts 3, 9, 14, 15, 20, 21, 24, 25 and 27. The cover 8 with its seals closes the spring housing in an oil-tight manner away. The axis 5 is designed as a hollow shaft and in the cable drum housing 1 and in the spring housing 12 by means of ball

030031/0357 _ ₄ _

3/7/70 BG

Dr. Werner Rohrs K.G., 8972 Sonthofen / Allgäu

Sheet ^ T for the letter to the German Patent Office, Munich, _January 25, 1979

warehouse 6 centrally stored. Through a central screw 17 leading through the hollow shaft, the cable drum housing 1 and the spring housing 12 connected to one another. On axis 5 is the cable drum 7 with the brake carrier disk 3, the spreader 15 and the spring winding mandrel 18 arranged.

The spiral ribbon spring 13 is through the Federaufwiekeldorη 18, which is connected to the axle 5 by means of a feather key 16, tensioned. The spiral ribbon spring is located on the outer 0 of the spring housing 12 13 fastened with the screws 11. The separation of the spiral ribbon spring 13 to the mechanical oil bath brake is carried out by the co-rotating partition 19. The oil bath 23 for the lubrication of the brake lining 24 and the spiral band spring 13 can be via an oil filler screw be filled or drained on the spring housing 12. Due to the low coefficient of friction of the brake lining 24 at oil lubrication, high contact pressure forces are required for the brake lining 24 for adequate dampening of the towing hanger.

Fig. 2 shows an embodiment _f in which the contact pressure between the brake ring 22 and the brake lining 24 takes place through the translation of the centrifugal force 26 in connection with the respective torque 28 of the spiral band spring 13. During the unwinding process, the cable drum 7 with the coupled brake carrier disk 3 with the brake levers 14 and flyweights 20 is set in rotation, the brake levers 14 with the leaf springs 25 taking along the expanding brake lever and tensioning the spiral band spring. As a result of the reaction torque 28 of the spiral band spring 13, the expanding brake lever 15 presses the brake lever 14 with the brake lining 24 against the brake ring 22 via the leaf springs 25 with the assistance of the centrifugal force 26. So that the braking device occurs somewhat delayed, the train springs 27 are dimensioned so that they bias the coil spring 13 and the centrifugal force 26 the balance a few turns

030031/0357

Dr. Werner Rohrs K.G., 8972 Sonthofen / Allgäu

Sheet ßr for writing to the German Patent Office, Munich _VO m 25 * 1.1979

keep. The brake levers 14 and the flyweights 20 are mounted on the brake carrier disk 3 by means of bearing bolts 2 and 9 by the hinge pin 10 in engagement with one another via an elongated hole. The translation of the centrifugal force 26 is by the Bolt spacing 29 is determined.

Fig. 3 shows a further Ausführungsbexspiel the invention, .in which the required contact pressure between the brake lining 24 and the brake ring 22 can only be achieved by the transmission of the torque 26 takes place (see German Patent No. 1 530 004). This is where it works Torque 28 by the spreading brake lever 15 directly on the flyweights 20. Furthermore, it is also possible to use a braking device to choose where the required contact pressure between brake lining 24 and brake ring 22 is only due to the centrifugal force 26 is effected. In this embodiment, with the spreading brake lever 15 omitted, the cable drum 7 is the brake carrier disk 3 and the spring winding mandrel 18 coupled by the parallel key 16, so that the spiral ribbon spring 13 is only effective as a return member is. (The dash-dotted line of the feather key in Figure 3).

The invention is not only intended for ski lift towing devices, but can also be used generally as a braking or damping device.

RS K.G.

030031/0357

Claims (9)

Dr. Werner Rohrs K.G., 8972 Sonthofen / Allgäu, sheet 6 for writing to the German Patent Office, Munich, January 25, 1979 Claims: 1.) i tow-for ski lifts, the tow rope spiral ^ y-shaped receiving cable drum, which is under the influence of a stretched for the tow feed spiral band spring and coupled to the acceleration process of the towed load as well as for continuous drawing-in of the towing bracket with a braking device , characterized in that the mechanical braking device (2, 3, 9, 14, 15, 20, .21, 25 and 27) assigned to the cable drum (7), in particular the brake lining (24) in the existing oil bath (23) of the hanger winding spring ( 18) works. 2.) towing hanger according to claim 1, characterized in that the required contact pressure between the brake ring (22) and the brake lining (24) through the translation of the centrifugal force (26) in connection with the respective torque (28) of the spiral band spring (13) according to German patent specification No. 1530004 takes place (Fig. 2). 3.) towing hanger according to claim 1, characterized in that the required contact pressure between the brake ring (22) and Brake lining (24) only takes place through the transmission ratio of the centrifugal force (26), the cable drum (7), the Brake carrier disc (3) and the spring winding mandrel (18) without expanding brake lever (15) together on the axle (5) by means of Feather key (16) are coupled (Fig. 3). -7- 030031/035 * 29 # Z963 Dr. Werner Rohrs K.G., 8972 Sonfhofen / Allgäu Sheet / f for the letter to the German Patent Office, Munich dated January 25, 1979 4.) towing hanger according to claim 1, characterized in that the required contact pressure between the brake ring (22) and the brake lining (24) takes place only through the translation of the torque (28), the spreading brake lever (15) acting directly on the flyweights (20) _O 5.) towing hanger according to claim 2, .3 and 4, characterized in that that the distance (29) of the hinge pins (9 and 10) can be chosen so that a sufficient transmission ratio between the flyweight (26) and the brake lever (14) is guaranteed. 6.) towing hanger according to claim 2, 3 and 4, characterized in that that the flyweights (20) and the brake levers (14) on the brake carrier disc (3) by means of hinge pins (9) and (10) are rotatable relative to each other so that when the centrifugal weights (20) are pivoted out, the brake levers (14) with the brake lining (24) apply to the brake ring (22) by the supporting force acting in the hinge pin (10). 7.) towing hanger according to claim 1, characterized in that the braking device (2, 3, 9, 14, 15, 20, 21, 24, .25 and 27) and the spiral band spring (13) in one and the same the sex drum housing (1) is housed in a flange-mounted spring housing (12). 8.) towing hanger according to claim 1, characterized in that the braking device (2, 3, 9, 14, 15, 20, 21, 24, 25 and 27) is arranged in an oil bath housing, which is only intended for the braking device. -8th- 030031/0357 Dr. Werner Rohrs K.G., 8972 Sonthofen / Allgäu Ai? U £> fö «J Sheet ST for the letter to the German Patent Office, Munich _{dated January} 25, 1979 9.) towing hanger according to claim 1, characterized in that the sex drum housing (1) and the spring housing (12) a screw (17) leading centrally through the hollow shaft (5) are connected. DR. WERFER, R ^ ShRS K.G. Ii 1/0357