Power transmission device and portable power working machine...

Details Power transmission device and portable power working machine... Power transmission device and portable power working machine...

2006-09-05

2006-09-05

Johnson, Vicky A. (Department: 3682)

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Pulley shifter

Reexamination Certificate

active

07101295

ABSTRACT:
A power transmission device is disclosed which is capable of easily, swiftly and appropriately altering the distance between the axes of a pair of transmission wheels such as pulleys, enabling an endless belt to be kept under constant and appropriate tension without necessitating a tension roller. This power transmission device comprises an endless belt wound around a pair of transmission wheels; and a cam-type adjusting mechanism which is interposed between a driving side supporting member and a driven side supporting member and configured to adjust a distance between the axes of the wheels. This cam-type adjusting mechanism comprises a supporting shaft secured to either the driving side supporting member or the driven side supporting member and disposed parallel to the rotational axes of the wheels; and a cam rotatably secured via a manipulating boss member to the supporting shaft.

REFERENCES:
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patent: 6374501 (2002-04-01), Claesson
patent: 57-026623 (1982-01-01), None
patent: 58-045216 (1983-01-01), None
patent: 4-104180 (1992-04-01), None

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