Sliding sharpening device for pencil with non-circular cross section
AssigneeSystem K, Inc.
InventorsArnim B. Jebe, Joseph A. Naim
Life of this patent
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Abstract
A sharpener for a carpenter's pencil that creates a profile shape desired by carpenters rather than a conical point. One end of the sharpener creates a sharpened profile on the narrow side of the pencil, while the opposite end of the sharpener creates a sharpened profile on the wide side when the pencil is rotated 90° about its axis. The pencil is slid laterally back and forth in a guide member, advancing along its axis as material is removed from the narrow side by fixed blades shaving material at an angle. The pencil is then rotated 90° and inserted in the other guide and moved back and forth advancing along its axis as material is removed from the wide side by fixed blades in a similar manner.
Claims12
Apparatus for sharpening an elongated object so as to obtain a selected profile on one end of the elongated object, the elongated object having an object axis and a uniform cross section along said object axis, said apparatus comprising:
- a housing defining a first recess having a first opening and having a first pair of convergent walls facing one another within the recess, said housing also having first guide rails extending along said first opening,
- a first guide member slidably mounted on said first guide rails, the first guide member defining a first passage therethrough, said first passage being shaped and dimensioned to receive the elongated object and to guide the object for longitudinal motion along the object axis between the convergent walls when manually actuated by a user, and
- at least one blade having a cutting edge and disposed on at least one of the convergent walls with said cutting edge extending into the recess, whereby the elongated object may be pushed through the passage of the guide member toward the convergent walls while the elongated object is also being used to slide the guide member to move the end of the elongated object laterally against the cutting edge of said blade, so as to sharpen the elongated object to obtain the selected profile.
The combination according to claim 4, wherein said selected blade shave angle is on the order of 20°.
Apparatus for sharpening an elongated object so as to obtain a selected profile on one end of the elongated object, the elongated object having an object axis and a uniform cross section along said object axis, said apparatus comprising:
- a housing defining a first recess having a first opening and having a first pair of convergent walls facing one another within the recess, said housing also having first guide rails extending along said first opening, said housing also defining a second recess having a second opening and having a second pair of convergent walls facing one another within the second recess, said housing also having second guide rails extending along said second opening,
- a first guide member slidably mounted on said first guide rails, the first guide member defining a first passage therethrough, said first passage being shaped and dimensioned to receive the elongated object and to guide the object for longitudinal motion along the object axis between the convergent walls when manually actuated by a user,
- a second guide member slidably mounted on said second guide rails, the second guide member defining a second passage therethrough, said second passage being shaped and dimensioned to receive the elongated object and to guide the object for longitudinal motion along the object axis between the second pair of convergent walls when manually actuated by a user,
- a plurality of blades, each blade having a cutting edge and disposed on one of said convergent walls with its cutting edge extending into one of the first and second recesses, whereby the elongated object may be pushed alternately through one of the first and second passages of the respective first and second guide members toward the convergent walls while the elongated object is also being used to slide a first or second guide member to move the end of the elongated object laterally against the cutting edges of said blades, so as to sharpen the elongated object to obtain the selected profile.
Dependencies are inferred from the claim text.