Mechanical pencil

Details Mechanical pencil Mechanical pencil

1980-06-20

1982-10-19

Coven, Edward M.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 64, 401 70, 401 86, B43K 2110

Patent

active

043547672

ABSTRACT:
A mechanical pencil has a clutch feature which prevents the breakage of the lead-carrying mechanism when the mechanism is advanced or retracted too hard or encounters an obstruction anywhere during its travel along the guide tube. The stationary lower barrel and guide tube are rotatably fixed to a rotating upper cap, knurled bushing and worm spring which drive the lead carrier along the stationary guide tube to advance and retract the lead. The lower end of the worm spring and the upper end of the cap bushing are linked together by clutch means which permits their relative slippage when excessive torque forces are encountered.

REFERENCES:
patent: 1425871 (1922-08-01), Liddell
patent: 2015673 (1935-10-01), Hauten
patent: 2110550 (1938-03-01), Friedlein et al.
patent: 2172349 (1939-09-01), Hauton
patent: 2511301 (1950-06-01), Smith
patent: 2690737 (1954-10-01), Lynn
patent: 2767687 (1956-10-01), Vierling
patent: 3139066 (1964-06-01), Aversa

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