Retractable, refillable, sharpen-free pencil assembly

Details Retractable, refillable, sharpen-free pencil assembly Retractable, refillable, sharpen-free pencil assembly

1993-01-05

1994-03-08

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 90, 401 94, B43K 2116

Patent

active

052922022

ABSTRACT:
A retractable, refillable, sharpen-free pencil assembly comprises an outer tube, an inner tube and several sections of pre-sharpened leads. The inner tube is movable relative to the outer tube. An upper half portion of the inner tube is enlarged by fitting a squeezing tube such that a spring can be positioned below the squeezing tube. When the inner tube is shifted, a lower portion of a spring pushes a lowest lead to a chucking device by which the lead is tightly gripped. A push plate attached to the slot of the outer tube has a squeezing portion engaged with the last coil of the spring. Sliding the push plate upward can pull the lower portion of the spring out of the inner tube. The propelled lead can be retracted into the inner tube and the inner tube can be pulled back and enclosed completely by the outer tube.

REFERENCES:
patent: 1124786 (1915-01-01), Murchey
patent: 4219282 (1980-08-01), Kuo
patent: 4320982 (1982-03-01), Kuo
patent: 4657421 (1987-04-01), Lin
patent: 4966478 (1990-10-01), Kuo

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