Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Patent
1986-02-18
1987-04-14
Bratlie, Steven A.
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
401 65, 401 85, 401 89, 401 90, 401 94, B43K 2116
Patent
active
046574212
ABSTRACT:
An improvement in the mechanical pencil of the type shown in U.S. Pat. No. 4,320,982. The improved mechanical pencil has a tubular outer casing, a coil spring disposed within the outer casing and an inner tube slidably inserted through the outer casing and the coil spring, the inner tube being adapted to store therein a plurality of presharpened lead pieces and having a conical shaped head formed at its lower end, the conical head being provided with two slots to form into a pair of clamping halves for clamping and releasing the presharpened lead pieces. The coil spring, which is adapted to urge the inner tube upwards, has a lowermost coil provided with a straight tail extending from the lowermost coil inwardly and downwardly at a predetermined angle with the longitudinal center axis of the coil spring, to fit into one of the two slots of the conical shaped head of the inner tube, with the tip of the tail being arranged to abut the rear end of the lead piece clamped by the clamping halves. The outer casing has a lower end provided with a throat having a shoulder to form an annular surface for seating the lowermost coil of the coil spring in a surface-to-surface engagement, the throat also having a groove to correspond to the slot in which the tail of the coil spring fits, so as to guide the tail of the coil spring.
REFERENCES:
patent: 1703596 (1929-02-01), DiRebaylio
patent: 4320982 (1982-03-01), Kuo
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