AUTOMATIC PENCIL FOR DRAWING A LINE

• US 3,779,652 A
• Filed: 08/05/1971
• Issued: 12/18/1973
• Est. Priority Date: 08/08/1970
• Status: Expired due to Term

• Current Assignee: Sadayoshi Kunitoku
• Original Assignee: Sadayoshi Kunitoku
• Inventors: Kunitoku, Sadayoshi
• Primary Examiner(s): Charles, Lawrence
• Application Number:
  US05/169,369
• Time in Patent Office: 866 Days
• Field of Search: 401/50,91
• US Class Current: 401/50
• CPC Class Codes: B43K 21/00 Propelling pencils projecting mechanisms for writing units B43K24/00; multiple-point writing implements B43K27/00
• CPC Class Codes: B43K 21/006 Pencil-barrels
• CPC Class Codes: B43K 29/06 with sharpening devices with erasing knives B43K29/18; pocket knives with pencils B26B

Abstract

An automatic pencil comprises a motor for constantly rotating the lead therein so that its point is automatically sharpened by contact with a writing surface.

Claims

1. An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatbly mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, both said motor and gripping means being longitudinally sladable in said casing. slidable

2. An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said casing comprising two parts, one of which is slidable with respect to the other, and said motor being fixed to one of said parts. 3 An automatic pencil as claimed in claim 2 in which said gripping means is a spring-operated chuck mounted to be opened when one part of said casing slides toward the other and closed when it slides away from the other.

4. An automatic pencil for drawing a line comprising a hollow casing having an open end, gripping means rotatably mounted in said casing in axial alignment with said open end for holding a lead projecting through said open end against transverse movement within said casing, and an electric motor connected to rotate said gripping means and lead, said motor being mounted to slide in said casing and said gripping means being a spring operated chuck mounted to be opened when said motor slides in one direction from a normal rest position and closed when said motor slides in the other direction and while it remains in said rest position, and said motor carrying abutment means positioned to advance said lead when said motor is moved in said one direction.