US 5,394,613 AGranted

Spring-driven pencil sharpener

OwnerHeng-Chun Kuinventor

Life of this patent

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Abstract

A spring-driven pencil sharpener is disclosed, including a top cap having a top opening to receive a pencil and two corresponding slots to receive a fastening device including a couple of hollow frames, a housing which is constructed with a pair of coupling castings, each of which being accompanied by a lateral cover, for disposing a pencil blade set and a spring-driven powering device and the outline of the housing is preferably designed to cooperate with that of the cap to form an egg-like shape for being held comfortably as well as looking nice.

Claims14

Dependent claims

A spring-driven pencil sharpener comprising:

a cap which defines an internal space having a cap opening at the top thereof for receiving a pencil, a pair of slots in two corresponding side walls thereof, a pair of side wings extending downward from the bottom thereof and a pair of posts, each post being securely adhered to said wings respectively and having a flange at a free end thereof to retain a first spring therearound;
a pair of coupling frames receivable within said pair of slots of said cap respectively, each frame including
a retaining block having one end securely adhered to one side of an inner surface of the frame and the other end being a semicircular free end, whereby two semicircular free ends form a hole to engagedly receive the pencil,
a holding post having one end securely adhered to one opposite side of the inner surface of the frame for holding a second spring,
a guiding plate, and
a track;
a bottom cover having a bottom cover opening, said bottom cover confining a portion of said pair of frames within the internal space of said cap in such a way that one of said frames serves as a fixed jaw and the other one serves as a movable jaw so that when said coupling frames are pressed inward while each said second spring reacts against each corresponding frame, said movable jaw slides relative to said fixed jaw via the guiding plates moving along the tracks to enlarge said hole formed by said two semicircular free ends of the retaining blocks in order to insert the pencil through said bottom cover opening;
a blade set for sharpening the pencil, said blade set having a blade set top opening and a bottom radial bevel gear;
a spring-driven powering device including
a powering device cover having a powering device cover top opening and a plurality of external lugs,
a rope-strain reliever having a top radial gear where said powering device cover top opening receives said bottom bevel gear of said blade set, and said top radial gear of said rope-strain reliever releasably engages with said bottom bevel gear of said blade set in one side so as to rotate said blade set in one direction only, and a bottom retaining member extending downward therefrom to retain a third spring at one end thereof,
a fixture having a top retaining member extending upward therefrom to retain the other end of said third spring, and a bottom radial gear,
a seat which has an internal space for receiving therein said rope-strain reliever, said third spring and said fixture, said seat having an inner bottom radial gear to releasably engage with said bottom radial gear of said fixture, and
a rope which is wound around said rope-strain reliever and tied thereto at one end;
and
a couple of castings, one of which has a pair of locking plates extending from the inner surface thereof to be releasably locked with the other one to form a housing which has a top opening for receiving therein the pencil and internally defining an upper space for disposing therein said blade set and for storing pencil cuttings, a lower space for disposing therein said spring-driven powering device in which two horizontally parallel plates are mounted to said housing and curving along therewith and the upper plate has a centered recess to rotatably lock with said external lugs of said powering device and the lower plate is to support said powering device on the bottom thereof, and two side spaces for respectively disposing therein the first springs, and a locking member pivotally connects a lateral cover to be swingingly openable in order to clean stored pencil cuttings produced from said blade set.

13 more elements

A spring-driven pencil sharpener, comprising:

a housing having an opening for receiving a pencil;
a blade set, disposed in said housing for sharpening the pencil, said blade set having an upper opening aligned with the opening in said housing for receiving the pencil, and a bottom gear;
and
a spring-driven powering device, in said housing beneath said blade set, for rotating said blade set to sharpen the pencil, including:
a rope-strain reliever mounted in said housing for rotation in opposite first and second directions, and having a top gear releasably engaging said bottom gear of said blade set so as to rotate said blade set only in said first direction, when the reliever is rotated in the first direction, said reliever also having a bottom spring-retaining member,
a spring having opposite first and second ends, said first end retained by said bottom spring-retaining member,
a fixture beneath said spring, retaining said second end of said spring, and
a rope wound around said reliever, said rope having opposite first and second rope ends, said first rope end being fixed to said reliever, said second rope end being free such that pulling said second rope end away from said reliever rotates said reliever and said blade set therewith, in said first direction against an elastic force of said spring.

5 more elements

A spring-driven pencil sharpener, comprising:

a housing having a housing opening for receiving a pencil and two vertically elongated side spaces defined by housing side walls and housing upper walls, said housing upper walls having upper wall openings;
a blade set, disposed in said housing for sharpening the pencil, said blade set having an upper opening aligned with the housing opening for receiving the pencil;
a spring-driven powering device, in said housing beneath said blade set, for rotating said blade set to sharpen the pencil;
a cap on the housing, said cap having
cap side walls which define an internal space,
a cap opening at the top thereof aligned with the housing opening for receiving the pencil,
a pair of posts, each post being securely adhered to said cap side walls and having a flange at a free end thereof, said posts extending through said upper wall openings into said side spaces, and
post springs on said posts, said post springs retained in said side spaces between said flanges and said housing upper walls, such that by lifting upward on said cap, said posts are lifted while said post springs are compressed between said flanges and said housing upper walls, and said flanges adhere to said housing side walls;
and
means, on said cap and extending into said internal space, for releasably gripping the pencil during the shapening thereof.

7 more elements

Dependencies are inferred from the claim text.

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Abstract

A spring-driven pencil sharpener comprising:

a cap which defines an internal space having a cap opening at the top thereof for receiving a pencil, a pair of slots in two corresponding side walls thereof, a pair of side wings extending downward from the bottom thereof and a pair of posts, each post being securely adhered to said wings respectively and having a flange at a free end thereof to retain a first spring therearound;
a pair of coupling frames receivable within said pair of slots of said cap respectively, each frame including
a retaining block having one end securely adhered to one side of an inner surface of the frame and the other end being a semicircular free end, whereby two semicircular free ends form a hole to engagedly receive the pencil,
a holding post having one end securely adhered to one opposite side of the inner surface of the frame for holding a second spring,
a guiding plate, and
a track;
a bottom cover having a bottom cover opening, said bottom cover confining a portion of said pair of frames within the internal space of said cap in such a way that one of said frames serves as a fixed jaw and the other one serves as a movable jaw so that when said coupling frames are pressed inward while each said second spring reacts against each corresponding frame, said movable jaw slides relative to said fixed jaw via the guiding plates moving along the tracks to enlarge said hole formed by said two semicircular free ends of the retaining blocks in order to insert the pencil through said bottom cover opening;
a blade set for sharpening the pencil, said blade set having a blade set top opening and a bottom radial bevel gear;
a spring-driven powering device including
a powering device cover having a powering device cover top opening and a plurality of external lugs,
a rope-strain reliever having a top radial gear where said powering device cover top opening receives said bottom bevel gear of said blade set, and said top radial gear of said rope-strain reliever releasably engages with said bottom bevel gear of said blade set in one side so as to rotate said blade set in one direction only, and a bottom retaining member extending downward therefrom to retain a third spring at one end thereof,
a fixture having a top retaining member extending upward therefrom to retain the other end of said third spring, and a bottom radial gear,
a seat which has an internal space for receiving therein said rope-strain reliever, said third spring and said fixture, said seat having an inner bottom radial gear to releasably engage with said bottom radial gear of said fixture, and
a rope which is wound around said rope-strain reliever and tied thereto at one end;
and
a couple of castings, one of which has a pair of locking plates extending from the inner surface thereof to be releasably locked with the other one to form a housing which has a top opening for receiving therein the pencil and internally defining an upper space for disposing therein said blade set and for storing pencil cuttings, a lower space for disposing therein said spring-driven powering device in which two horizontally parallel plates are mounted to said housing and curving along therewith and the upper plate has a centered recess to rotatably lock with said external lugs of said powering device and the lower plate is to support said powering device on the bottom thereof, and two side spaces for respectively disposing therein the first springs, and a locking member pivotally connects a lateral cover to be swingingly openable in order to clean stored pencil cuttings produced from said blade set.

13 more elements