Retractable mechanism for a writing element

Details Retractable mechanism for a writing element Retractable mechanism for a writing element

1980-06-25

1982-08-10

Pieprz, William

Coating implements with material supply

Projectable and retractable tool

Including retraction spring and projected-position retainer

401112, B43K 2400

Patent

active

043435599

ABSTRACT:
A retractable mechanism for a writing element especially the expendable refill of a ball-point writing pen, is disclosed. A manually depressible plunger (4) advances a latch member (7) biased to retract the plunger (4). The latch member (7) has a pair of latch arms (11,12) one of which in an advanced or retracted position thereof engage a latch means (5,6). Depression of the plunger (4) releases the engaged latch arm (11 or 12) from its latch means (5,6). The resultant of the force on the plunger (4) and bias on the writing element (1) then laterally aligns the other latch arm (12 or 11) with its latch means (6 or 5). On release of the plunger (4), the bias on the writing element (1) brings a co-operating notch (16) and pivot edge (15) of the aligned latch arm (11,12) and latch means (5,6) into register for pivot action therebetween. This pivot action and rocking of the latch member (7) about its fulcrum (9) positions the latch member rearward limb (23) in readiness for the next depression of the plunger (14) whereby the writing element (1) may be displaced between its retracted and projected positions (or vice versa) in response to successive depressions of the plunger (4).

REFERENCES:
patent: 2930356 (1960-03-01), Lignori
patent: 3007444 (1961-11-01), Lockwood
patent: 3062191 (1962-11-01), Van Haltern et al.
patent: 3558234 (1971-01-01), Kranich

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