Mechanical pencil

Details Mechanical pencil Mechanical pencil

1980-01-08

1982-08-10

Coven, Edward M.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

B43K 2116

Patent

active

043435580

ABSTRACT:
A mechanical pencil including a buffer spring is disclosed. The mechanical pencil has a chuck whose chucking point is elongated in the direction towards the front of the pencil so that if the lead is broken at the chucking point, the length of broken lead within the pencil is minimized, thereby reducing the amount of wasted lead. The buffer spring is located either adjacent the fastening ring or within the lead case. In either embodiment, the buffer spring buffers the impact of the chucking point against the fastening ring. In the embodiment where the buffer spring is located within the lead case, the lead case and an intermediate connecting member, together with the distance therebetween, form a buffer spring operating mechanism.

REFERENCES:
patent: 233814 (1880-10-01), Sneider
patent: 240399 (1881-04-01), Frederick
patent: 2184911 (1939-12-01), Fend
patent: 2517297 (1950-08-01), Ferber
patent: 2528328 (1950-10-01), Baker et al.
patent: 2800109 (1957-07-01), Germann
patent: 2844125 (1958-07-01), Wehn
patent: 4149813 (1979-04-01), Katz et al.
patent: 4162080 (1979-04-01), Buck
patent: 4171170 (1979-10-01), Kageyama et al.
patent: 4180339 (1979-12-01), Katz

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