Mechanical pencil with groove and lug structure

Details Mechanical pencil with groove and lug structure Mechanical pencil with groove and lug structure

1985-06-24

1986-09-09

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 76, 401 77, 401 78, 401 86, 401 87, B43K 2108, B43K 2106

Patent

active

046105573

ABSTRACT:
A low-cost mechanical pencil employing an improved lead-driving mechanism in which there is cooperation between a low-cost, helical spring member through which moves a lead advance-retract member which is keyed to longitudinal grooves in the inner barrel wall. If the lead is subjected to excessive pressure during use, it is caused to partially retract into the tip by virtue of axial compression of the helical spring, thereby reducing the likelihood of lead breakage.

REFERENCES:
patent: 1546490 (1925-07-01), Kahn
patent: 1627602 (1927-05-01), Goldsmith
patent: 1716953 (1929-06-01), Dunne
patent: 1774699 (1930-09-01), Chelton
patent: 2161889 (1939-06-01), Schaefer
patent: 2356509 (1944-08-01), Deli
patent: 2563128 (1951-08-01), Merryman
patent: 2866438 (1958-12-01), Schischkow
patent: 3771882 (1973-11-01), Kapilow
patent: 4136980 (1979-01-01), Leem

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