Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Reexamination Certificate
2002-07-01
2004-06-01
Marcelo, Emmanuel (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
C474S171000, C474S184000
Reexamination Certificate
active
06742769
ABSTRACT:
TECHNICAL FIELD
The present invention relates to elevators and, more particularly, to a novel sheave design for improved performance and durability.
BACKGROUND AND SUMMARY OF THE INVENTION
Conventional elevator systems have long utilized standard elevator ropes to suspend and move elevator cars. In order to optimize performance in such areas as traction, durability, ride quality and safety, numerous design parameters have limited various components such as motors, sheaves and rope grade to certain sizes, weights and dimensions.
New generation elevator systems are being developed that eliminate the need for various conventional components, through the implementation of superior performing traction and drive systems and other advancements. These types of systems offer many advantages over traditional elevator systems, including structural versatility and economy, convenient access for servicing and repair, and lighter building loads.
One particular advancement is the implementation of high-traction, high durability elevator ropes that are smooth running, light in weight and corrosive-resistant. One such type of rope is made of a plurality of tension-carrying cord members contained in a unitary insulation jacket made of, for example, a urethane material. For optimum performance with such ropes, it is desirable to adapt various components such as sheaves to interface closely.
Conventional elevator sheaves are cast iron and designed to accommodate traditional round, steel wire ropes. With the increasing feasibility of new generation elevator ropes, such as elastomer-coated, flat ropes, new problems related to tracking, traction and durability must be addressed. It is an object of the present invention to provide a sheave design having particular dimensional, geometric, and surface characteristics selected for optimum performance and durability for use with such new generation elevator ropes.
This object and others are achieved by the present invention sheave design. The present invention sheave design provides a hard, corrossion-resistant coating on the sheave contact surface for improved durability. Another aspect of the invention relates to providing a particular circumferential roughness to the contact surface for traction. The circumferential surface roughness is preferably about 1.0 to about 3.0 microns. The coating preferably has a thickness of about 1-2 microns. The coated surface preferably has a hardness of greater than about 40 HRC.
REFERENCES:
patent: 380077 (1888-03-01), Barrie
patent: 426638 (1890-04-01), Fee
patent: 975790 (1910-11-01), Pearson
patent: 1011423 (1911-12-01), Gale, Sr.
patent: 1035230 (1912-08-01), Pearson
patent: 1164115 (1915-12-01), Pearson
patent: 2413817 (1947-01-01), Firth
patent: 3142192 (1964-07-01), Edberg
patent: 3498817 (1970-03-01), Stone
patent: 3713348 (1973-01-01), Conrad et al.
patent: 3851535 (1974-12-01), Presentey
patent: 4034616 (1977-07-01), Rauscher
patent: 4114751 (1978-09-01), Nordin
patent: 4607808 (1986-08-01), Collins
patent: 4781660 (1988-11-01), Amataka et al.
patent: 4979928 (1990-12-01), Lindsay
patent: 5112933 (1992-05-01), O'Donnell, et al.
patent: 5281189 (1994-01-01), Agnoff
patent: 5284457 (1994-02-01), Gerstenberger et al.
patent: 1298818 (1969-07-01), None
patent: 23 33 120 (1975-01-01), None
patent: 19730400 (1999-02-01), None
patent: 0 356 798 (1989-08-01), None
patent: 1.131.923 (1955-04-01), None
patent: 1 362 514 (1974-08-01), None
patent: 1 401 197 (1975-07-01), None
patent: 2 162 283 (1984-07-01), None
patent: 6-158264 (1994-06-01), None
patent: 1216120 (1986-07-01), None
patent: 98/29326 (1998-07-01), None
patent: 98/29327 (1998-07-01), None
Sass et al., Dubbel Taschenbuckh für den Maschinenbau (1974), pp. 543-545, Springer-Verlag, Berlin.
Baranda Pedro S.
Hollowell Richard L.
Hubbard James
Logan Douglas E.
Pitts John T.
Marcelo Emmanuel
Otis Elevator Company
LandOfFree
Elevator sheave for use with flat ropes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elevator sheave for use with flat ropes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elevator sheave for use with flat ropes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3359651