Endless belt power transmission systems or components – Friction drive pulley or guide roll
Patent
1989-02-28
1991-05-28
Bui, Thuy M.
Endless belt power transmission systems or components
Friction drive pulley or guide roll
474167, 474268, F16G 108, F16H 5536
Patent
active
050190199
DESCRIPTION:
BRIEF SUMMARY
This invention relates to pulleys and in particular pulleys which have a peripheral recess or groove for receiving a rope or cable.
Prior art pulleys are exemplified by the disclosure in GB No. 1125738 where the rim comprises a pair of opposed rim halves which are fixed to a hub to form the outer half of the pulley. Each rim half has bonded thereto a half tire section which when the rims are bolted to the hub together form a complete tire having a peripheral recess for accommodation of a rope or cable which is substantially concentric with the surface of the rim halves and hub.
The difficulties with the prior art as described above have resulted from the interface between the two tire halves fracturing due to the lack of continuation of the section and support provided at the junction therebetween.
In one form the invention resides in a pulley comprising a hub having a substantially cylindrical outer face and a pair of rim halves adapted to be mounted to the hub and having opposed inner axial faces which are divergent with respect to each other, a separatable pulley tire having a cross-sectional configuration corresponding substantially to the space defined between the hub and the inner axial faces of the rimmed halves and having an inner circumference whereby the tire is snugly received on the hub and is clampingly received between the rim halves said tire having a reinforcing ring located at or adjacent the inner circumference of the tire, the outer circumference of the tire being formed with a peripheral groove for accommodation of a rope or cable.
According to a preferred feature of the invention the tire is formed from an elastomeric material.
According to a further preferred feature of the invention a layer of elastomeric material is located between the inner circumference of the reinforcing ring to define the inner circumference of the tire.
According to a preferred feature of the previous feature the layer of elastomeric material has a greater resilience and/or may be less hard than the elastomeric material forming the pulley tire.
According to a further preferred feature of the invention the axial faces of the tire are formed of an elastomeric material of contrasting colour to the elastomeric material forming the body of the tire.
According to a preferred feature of the previous feature the elastomeric material at its outer axial faces of the tire have a greater strength or hardness than the elastomeric material forming the body of the tire.
According to a preferred feature the reinforcing ring is formed of an elastomeric material of similar composition to that of the tire but having a greater strength or hardness.
According to a preferred feature of the previous feature the reinforcing ring extends over the inner circumference of the tire and partially over each axial face.
According to a further preferred feature the axial faces of the tire are formed of an elastomeric material having a greater strength or hardness than the elastomeric material forming the main body of the tire and a further layer of elastomeric material is located between the inner circumference of the tire and reinforcing means and is formed of a material having a differing strength or hardness from the main body of the tire.
A further difficulty of the prior art resides in the feature that a large portion of the cross sectional area of the tire is occupied by the peripheral groove and therefore the degree of wear which can be tolerated before the rope or cable engages the rim half is significantly reduced.
According to a further preferred feature of the invention the cross sectional area of the peripheral groove is less than half of the overall cross sectional area of the tire.
According to a further preferred feature of the invention the peripheral groove can be located to one side of the outer circumference of the tire.
In another form the invention resides in a pulley tire which is be received on a hub having a substantially cylindrical outer face and between a pair of rim halves which are adapted to be mounted to each axi
REFERENCES:
patent: 2884797 (1959-05-01), Murray
patent: 3177733 (1965-04-01), Yamano
patent: 3633432 (1972-01-01), Horsey
patent: 3707883 (1973-01-01), Kamenick
patent: 4299018 (1981-11-01), Brickerstaff et al.
Semperit Brochure, "Seilrollenfutterungen" (publishing date unknown).
Malloya Brochure, "Gummi-Einlagering mit Stahlcord-Einlage" (publishing date unknown).
LandOfFree
Pulley tire rim configuration does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pulley tire rim configuration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulley tire rim configuration will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-32786