US 4,237,945 AGranted

Apparatus and method for abrading pencil lead

OwnerTing-Fu Penginventor

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Abstract

An apparatus and method for abrading pencil lead are provided. The apparatus comprises two major parts-- a receptacle and an abrader. The apparatus is further modified by the addition of two subordinate components-- storage space and graphite dust cleaning compartments. The receptacle is in the form of a container having an open top and is defined by a bottom and two sidewalls; the abrader is in the form of a plate with abrasive surface on both sides. At one end of the abrader, two pivotal means are provided to engage with two pivotal receiving means formed at middle points of two inclining side rims of the receptacle; and the other end of the abrader rests on the end rim of the receptacle. When the graphite dust presents on the surface of the abrader after abrading, the abrader is flipped from one side to the opposite side of the rim, the graphite dust is threby disposed of in the receptacle and the other side of the dust-free abrading surface appears toward the top, ready for the next abrading.

Claims3

Dependent claims

A pencil lead abrading device, comprising two major parts--a receptacle and an abrader, and is further defined as follows:

the said receptacle with an open top is defined by sidewalls and a bottom, whereupon, two pivotal receiving means are formed at middle points of two opposite side rims of the said receptacle in order to receive two pivotal means of the said abrader, and each of the said side rims decline from two ends toward middle point of the said side rim to form a valley and to define an angle less than 180.degree.;
the said abrader being in the form of plate with abrasive surfaces on both sides of the said plate, and possessing two pivotal means at one end of said plate, and each said pivotal means fits into each said pivotal receiving means of said side rims;
the other end of the said abrader rests on the end rim of said receptcale, therefore, by turning one of the said pivotal means or pressing against the said end of the said abrader with pencil point to flip the said abrader, the said abrader will rotate from said end rim to the other end rim of the said receptacle.

Dependencies are inferred from the claim text.