Patent ID: 8087841

Claim:
A retractable pen with retraction-linking device for extending pen-body, comprising: a lower pen tube, comprising a stop ring installed on one end thereof; an upper pen tube unit, movably with the lower pen tube, comprising a joint; a retractable core rod, comprising a joint on one end thereof for combining with the upper pen tube, at least one lug disposed on a peripheral edge thereof, and at least one slide groove formed on an external side thereof; a jump key unit, comprising a stationary cam sleeve fixed inside the lower pen tube, a plunger, a rotating cam, a first spring disposed on the retractable core rod with both ends thereof respectively head hinged against the upper pen tube and the stationary cam sleeve, in which the plunger correspondingly moves with the joint of the upper pen tube unit, which is formed on a guide block sliding in the slide groove of the retractable core rod, wherein a plurality of flat ribs are disposed on the peripheral edge of one end of the plunger, a plurality of upper toothed parts are disposed on the peripheral edge of one end of the plunger, at least one stop block inside the rotating cam allowing the lug to move and stop, and a third spring disposed on one end of the lower pen tube with both ends thereof respectively head hinged against the rotating cam and the stop ring; and a pen refill unit, disposed in the retractable core rod and leaned against the rotating cam, and a second spring is disposed between the pen refill unit and the lower pen tube.