US 7,001,093 B2 · Collapsible pen

Abstract

A collapsible pen including a telescopically extensible barrel and a ballpoint refill cartridge having a ballpoint tip removably attached to the barrel. The pen further includes a ballpoint tip cap that releasably attaches to the refill cartridge. The extensible barrel includes an outer tubular member and at least two and most preferably three inner tubular members concentrically and coaxially mounted with respect to both the outer tubular member and to one another. Each inner tubular member has a smaller outer diameter than the overlying tubular members. The ballpoint tip cap, adapted for attachment to a key chain, is releasably attached to either the outer tubular member of the barrel or to the refill cartridge to cover the ballpoint tip. The pen has a fully extended length and a collapsed (retracted) length. With a barrel consisting of three inner tubular members, and the cap removed, the fully extended length of the pen is greater than twice the collapsed length of the pen.

Claims8

Dependent claims

A collapsible pen having a fully extended length and a collapsed length wherein said fully extended length is greater than or equal to twice said collapsed length and wherein said collapsible pen comprises:

(a) a tubular telescopically extendable barrel having a leading end and a trailing end wherein said leading end has a greater outer diameter than said trailing end when said barrel is extended;
(b) a threaded barrel tip affixed to said leading end of said barrel;
(c) a ballpoint pen refill cartridge adapted to be releasably attached to said threaded barrel tip;
(d) a rear cap affixed to said trailing end of said barrel;
and (e) a ballpoint refill cap having a leading end with chain attachment means thereon and a trailing end having a conical recess therewithin and pen engagement means disposed within said conical recess.

2 more elements

Dependencies are inferred from the claim text.

Collapsible pen

Life of this patent

Collapsible pen

Life of this patent

Abstract

Claims8