Endless belt power transmission systems or components – Hub formed in sections and separable by moving sections...
Reexamination Certificate
1999-04-06
2001-01-23
Fenstermacher, David (Department: 3682)
Endless belt power transmission systems or components
Hub formed in sections and separable by moving sections...
C474S170000
Reexamination Certificate
active
06176797
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an adaptor for power transmission in a pulley and shaft which is particularly advantageous for adapting a plastic pulley for attachment to a metal shaft for the transmission of power at high torque.
Typically, chain driven pulleys for power transmission are formed of metal and are keyed directly to metal shafts. Alternatively, they may be attached to tapered bushings, also formed of metal, that include a cylindrical aperture and a keyway for connection to the shaft. The tapered bushings have a slightly tapered frustrum that is slit axially along a side to allow the frustrum to compressibly form a strong interference fit with a hole through the pulley. The pulley is further held to the tapered bushing by bolting the pulley to threaded holes in a corresponding flange of the bushing.
Although such metal pulley and shaft systems are well suited to transmitting power at high torque, such systems have well known disadvantages in that they are relatively costly, have heavy rotating parts, can be noisy, and are susceptible to corrosion. For this reason, power transmission components made from plastic are also available. Such components provide for less cost, weight and noise, and greater corrosion resistance; however, they are less able to transmit power at high torque. Where keyed directly to a shaft, the plastic deforms at the keyway under large loads. Moreover, plastic pulleys typically cannot be reliably attached to tapered bushings, because they cannot compress the frustrum sufficiently to form a strong interference fit.
Generally, it is advantageous to provide a pulley and adaptor profile that serves as a guide as well as provides friction surfaces for transmitting torque, as suggested by Draebel, U.S. Pat. No. 5,061,225. A disadvantage of the trapezoidal profiles of Draebal, however, is that such complex profiles are non-standard features in typical pulleys.
Accordingly, there is a need for an adaptor for power transmission in a pulley and shaft that provides for the advantages of light weight, low cost and low acoustical noise available from plastic pulleys and provides for high torque power transmission.
SUMMARY OF THE INVENTION
The present invention solves the aforementioned problems and meets the aforementioned needs by providing an adaptor for power transmission in a pulley and shaft comprising two adaptor portions. The adaptor portions are disposed on opposite sides of the pulley and drawn axially together to capture the pulley therebetween. At least one of the adaptor portions is attached to a bushing which is attached to the shaft. A connecting member passes through the bushing and the adaptor portions and tightening of the connecting member draws both adaptor portions and the bushing together. Preferably, the bushing is tapered and the adaptor portions are correspondingly tapered, so that drawing both adaptor portions and the bushing together forces sides of the adaptor portions against a side of the bushing. Preferably, the adaptor portions are employed with a pulley that is substantially formed of plastic, and that has a standard configuration, such as having substantially parallel faces and a substantially perpendicularly extending central aperture.
Accordingly, it is a principal object of the present invention to provide a novel adaptor for power transmission in a pulley and shaft.
It is another object of the present invention to provide such an adaptor that provides for light weight, low cost and low acoustical noise.
It is still another object of the present invention to provide such an adaptor that provides for high torque power transmission.
It is yet another object of the present invention to provide such an adaptor for use with a pulley having a standard configuration.
The foregoing and other objects, features and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the following drawings.
REFERENCES:
patent: 1303445 (1919-05-01), Wright
patent: 2269821 (1942-01-01), Kemphert et al.
patent: 2704793 (1955-03-01), Hanson
patent: 2784606 (1957-03-01), Schilling
patent: 2806379 (1957-09-01), Haracz
patent: 3651705 (1972-03-01), Bertinetti et al.
patent: 4229117 (1980-10-01), Coppin et al.
patent: 4413981 (1983-11-01), White et al.
patent: 5061225 (1991-10-01), Draebel
patent: 5304101 (1994-04-01), Baer
Fenstermacher David
Poly Hi Solidur Inc.
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