| 摘要 |
An exercising machine comprising two axially spaced reels, two cables respectively wound on the reels, an electric motor, and drive means including two axially spaced slip clutches respectively connecting the reels to the motor to apply constant tensions to the cables, the drive means including a common shaft interconnecting the clutches. The exercising machine also includes means for increasing, or decreasing, the resistances of both clutches to slippage, and further includes adjusting means for cyclically varying the resistances of the clutches to slippage by alternately increasing the resistance of one clutch and decreasing that of the other. The first adjusting means mentioned includes a sleeve encompassing a portion of the shaft between the clutches and having oppositely threaded portions, and nuts respectively threaded on such portions of the sleeve and respectively connected to the clutches, whereby resistances to slippage of both clutches can be increased or decreased by rotating the sleeve. The second adjusting means comprises a cam means on the shaft for reciprocating the sleeve axially of the shaft to alternately increase the resistance to slippage of one clutch and decrease that of the other.
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