US3664205A - Drive means for an endless rope, especially for ski lifts - Google Patents

Drive means for an endless rope, especially for ski lifts Download PDF

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Publication number
US3664205A
US3664205A US66999A US3664205DA US3664205A US 3664205 A US3664205 A US 3664205A US 66999 A US66999 A US 66999A US 3664205D A US3664205D A US 3664205DA US 3664205 A US3664205 A US 3664205A
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US
United States
Prior art keywords
drum
rope
conical
drive
roller
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
US66999A
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English (en)
Inventor
Arne Widar Luras
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Individual
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Individual
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Publication date
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Publication of US3664205A publication Critical patent/US3664205A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
    • B66D1/74—Capstans
    • B66D1/7405—Capstans having two or more drums providing tractive force

Definitions

  • Small portable ski lifts require small drive drums for the endless rope.
  • the two turns must therefore be guided so as to be kept separate from each other.
  • In this connection regard must be paid to the fact that when there is no load on the rope, the tension in the rope is small and the rope may therefore frequently swing from one side to the other.
  • the object of the present invention is to provide a drive means of the kind referred to, which in a simple way and with a minimum of wear separates the two turns so that the rope will not be jammed on the drum even if the rope swings.
  • this is achieved by making the drive drum conical and by positioning the idle roller radially outside the position on the circumference of the drum at which the incoming reach enters the drum and in approximately the same plane as the part of the conical drum having the smaller diameter.
  • the idle roller is preferably rotatably mounted in a bracket mounted so as to be pivotal and displaceable in relation to the drum, whereby the plane of the roller can be somewhat adjusted in relation thereto.
  • the drive means may be adjusted so that irregularities in the positioning of the frame on which the drive means is mounted, are off-set.
  • the invention makes use of the fact that the rope will tend to climb onto the portion of the conical drum having the larger diameter. Thereby the first turn of the rope will stay at this end of the drum even if the drum has no grooves, but a smooth periphery. Since the idle roller is positioned radially outside the position at which the incoming reach of the rope enters the drum, there will not at this position exist two rope portions which could cross and jam as a result of swings or jerks in the incoming rope. This positioning of the idle roller also entails that the larger part of the winding angle of the rope around the drum is covered by the first turn, whereas the rope, when returning to the drum from the idle roller, will surround the drum with a winding angle of nearly 90 to 100.
  • the portion of the drum having the smaller diameter may be less conical and even cylindrical.
  • FIG. 1 is a side view and FIG. 2 an end view of an embodiment of a drive means of the invention for a portable ski lift.
  • the drawing illustrates a fragment of a frame 1 on which the drive means is mounted.
  • the frame 1 carries a diagrammatically illustrated motor 2, which may, if desired, be provided with a gear.
  • a drive drum 4 for an endless pulling rope 5 is attached to the shaft 3 of the motor 2.
  • the frame 1 further carries a bracket 6 having two legs-7 in which an idle grooved roller 8 is rotatably mounted.
  • the frame 1 of course constitutes the upper station of the ski lift.
  • the upward reach of the rope which is identical to the reach entering the drive drum 4, enters the drum on the lower side thereof and follows the periphery of the drum for about 270 to 280. From this position the rope is passed to the roller 8, which has somewhat smaller diameter than the drive drum 4. The rope extends about 180 around the roller 8 in the same winding direction as around the drive drum 4 and then returns to the drum. After a turn of about on the periphery of the drive drum the rope finally leaves the drive drum and passes to an idle roller (not illustrated) in a lower station at the foot of the hill. From this station the rope again moves up the hill and back to the drive drum.
  • this reach will be tensioned whereas the reach leaving the drive drum and descending the hill will hang considerably looser and usually trail the ground.
  • the drum 4 is truncated.
  • the best taper of the drum cannot be judged from the drawing, which is merely diagrammatical.
  • the best value for the taper may be ascertained by experiments and may well be considerably less than illustrated in the drawing.
  • the portion of the drum having the smaller diameter may also be approximately cylindrical or the taper may be smaller than for the remaining part of the drum.
  • the roller 8 is positioned in approximately the same plane as the part of the drum having the smaller diameter.
  • the bracket 6 is secured to the frame 1 by a single bolt extending through an elongated aperture in the bracket 6, whereby the bracket may be displaced and pivoted in the interface between the bracket 6 and the frame 1.
  • the tension in the rope 5 will diminish from the position where the rope enters the drum 4, to the position where the rope leaves the drum.
  • the rope being resilient, it will gradually contract, and the distance between two fixed points on the rope will be shorter during the second turn than during the first, which entails a slip between the rope and the drum if the speed of the drum is the same on the entire periphery. This induces wear and results in reduced efficiency.
  • this tendency is counteracted by the fact that the second turn engages the drum on a portion of the periphery having smaller diameter.
  • a drive mechanism for an endless rope, especially for skilifts comprising: a motor-driven flanged conical drive drum for frictionally driving said endless rope which is twice passed over the drum, said drum comprising a truncated conical profile; and an idle separating roller mounted with its axis substantially parallel to said of the drum, and disposed so that the roller is substantially coplanar with a lower diametered cross section of said conical drum towards its tapered end, so as to enable a portion of the rope to be passed around said separating idle roller to guide the rope, thereby preventing two turns of the rope passed around the conical drum from over-riding each other.
  • roller is rotatably mounted in a bracket mounted so as to be pivotal and displaceable in relation to the drum, whereby the plane of the roller can be somewhat adjusted in relation to the drum.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US66999A 1969-08-30 1970-08-26 Drive means for an endless rope, especially for ski lifts Expired - Lifetime US3664205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO3478/69A NO122983B (OSRAM) 1969-08-30 1969-08-30

Publications (1)

Publication Number Publication Date
US3664205A true US3664205A (en) 1972-05-23

Family

ID=19879650

Family Applications (1)

Application Number Title Priority Date Filing Date
US66999A Expired - Lifetime US3664205A (en) 1969-08-30 1970-08-26 Drive means for an endless rope, especially for ski lifts

Country Status (5)

Country Link
US (1) US3664205A (OSRAM)
DE (1) DE2042340A1 (OSRAM)
FI (1) FI46138C (OSRAM)
NO (1) NO122983B (OSRAM)
SE (1) SE353277B (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874246A (en) * 1974-02-25 1975-04-01 Boyd Woodard Cable pulley drive device
US5186283A (en) * 1991-09-26 1993-02-16 Otis Elevator Company Triple-wrap traction arrangement
US20030178155A1 (en) * 2002-03-25 2003-09-25 Richard Fraczek Mono control lift and tilt mechanism for horizontal blinds
US6712338B2 (en) * 2000-04-03 2004-03-30 George Brian Schafer Tahoe rescue tool—rescue hoist
WO2006073462A3 (en) * 2005-01-06 2007-06-07 Quoin International Inc Powered personnel ascender
US20080157042A1 (en) * 2005-01-06 2008-07-03 Quoin International, Inc. Powered personnel ascender

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2506842B2 (de) * 1975-02-18 1981-07-09 Siemens AG, 1000 Berlin und 8000 München Gaslaser mit Kaltkathode
CH656600A5 (de) * 1981-09-24 1986-07-15 Rotzler Gmbh Co Mobile seilwinde.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US660783A (en) * 1899-12-01 1900-10-30 Emil L Wagner Rope-pulley.
US682395A (en) * 1900-11-27 1901-09-10 Emil L Wagner Pulley.
US2646005A (en) * 1949-02-07 1953-07-21 Harvey F Swenson Ski tow

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US660783A (en) * 1899-12-01 1900-10-30 Emil L Wagner Rope-pulley.
US682395A (en) * 1900-11-27 1901-09-10 Emil L Wagner Pulley.
US2646005A (en) * 1949-02-07 1953-07-21 Harvey F Swenson Ski tow

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874246A (en) * 1974-02-25 1975-04-01 Boyd Woodard Cable pulley drive device
US5186283A (en) * 1991-09-26 1993-02-16 Otis Elevator Company Triple-wrap traction arrangement
US6712338B2 (en) * 2000-04-03 2004-03-30 George Brian Schafer Tahoe rescue tool—rescue hoist
US20030178155A1 (en) * 2002-03-25 2003-09-25 Richard Fraczek Mono control lift and tilt mechanism for horizontal blinds
US7137430B2 (en) 2002-03-25 2006-11-21 Rollease, Inc. Mono control lift and tilt mechanism for horizontal blinds
WO2006073462A3 (en) * 2005-01-06 2007-06-07 Quoin International Inc Powered personnel ascender
US20080157042A1 (en) * 2005-01-06 2008-07-03 Quoin International, Inc. Powered personnel ascender
US7448597B2 (en) 2005-01-06 2008-11-11 Quoin International, Inc. Powered personnel ascender

Also Published As

Publication number Publication date
SE353277B (OSRAM) 1973-01-29
NO122983B (OSRAM) 1971-09-13
DE2042340A1 (de) 1971-03-04
FI46138B (OSRAM) 1972-10-02
FI46138C (fi) 1973-01-10

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