| 摘要 |
<p>An exercise machine including a weight stack (13) composed of a plurality of separate weights (21, 23, 25, 27); a lifting bar (15) disposed for movement within the weight stack; a plurality of pins (41, 43, 45, 47) extendible from within the lifting bar for removably securing a portion of the weight stack to the lifting bar and retractable within the lifting bar, whereby the total weight carried by the lifting bar is determined by the portion of the weight stack removably secured to the lifting bar by the plurality of pins, wherein the extension of the plurality of pins from within the lifting bar secures the portion of the weight stack to the lifting bar and the retraction of the plurality of pins within the lifting bar removes the portion of the weight stack from the lifting bar; a plurality of springs (49, 51) for retracting the pins within the lifting bar; a key (50) for extending one or more of the pins from the lifting bar; a cable (61) connected to the key; a reel (63) for biasing the cable and key in one direction; and a foot-pedal (70) for pulling the cable and key in the other direction whereby movement of the key in one direction extends the pins to add weights to the stack and movement in the other direction allows the pins to retract to drop weights from the stack.</p> |
