MARK-ERASABLE PEN CAP

• US 20100266326A1
• Filed: 04/21/2009
• Published: 10/21/2010
• Est. Priority Date: 04/21/2009
• Status: Abandoned Application

• Current Assignee: Cheng-Hua Chuang
• Original Assignee: Cheng-Hua Chuang
• Inventors: Chuang, Cheng-Hua
• Application Number:
  US12/427,166
• Publication Number:
  US 20100266326A1
• Time in Patent Office: Days
• US Class Current: 401/98
• CPC Class Codes: B43K 23/124 comprising an air passage
• CPC Class Codes: B43K 29/02 with rubbers
• CPC Class Codes: B43L 19/00 Erasers, rubbers, or erasing devices; Holders therefor rubbers or erasing knives combined with writing implements B43K29/02, B43K29/18

Abstract

A mark-erasable pen cap comprises a cap body having a containing groove. The cap body is made of an elastic erasing material and defines a first end and an opposing second end. The first end has an opening. The containing groove comprises a bottom portion, an opening portion, and a wall portion. The bottom portion neighboring to the first end has a first diameter; the opening portion located at the second end has a second diameter smaller than the first diameter; and the wall portion connecting the bottom portion and the opening portion has an inner diameter substantially tapered from the opening portion to the bottom portion.

Claims

1. A mark-erasable pen cap being applied to receive an end of a writing instrument therein, comprising:

a cap body made of an elastic erasing material defining a first end and a second end having a containing groove with a containing space to receive the end of the writing instrument therein, said containing grove further comprising;

a bottom portion neighboring to the first end and having a first diameter;

an opening portion neighboring to the second end and having a second diameter; and

a wall portion connecting with the bottom portion and the opening portion, having an inner diameter substantially enlarged from the first diameter to the second diameter.

2. The mark-erasable pen cap according to claim 1, wherein said elastic erasing material is a rubber material.

3. The mark-erasable pen cap according to claim 1, wherein said cap body has an opening neighboring to the first end.

4. The mark-erasable pen cap according to claim 1, wherein said first end is a structure with a trapezoid cross-section.

5. The mark-erasable pen cap according to claim 1, wherein said wall portion has an interior threaded surface.