Knock type mechanical pencil connection
AssigneeParker Pen (Benelux) B.V.
InventorOwen S. Jones
Life of this patent
Estimating the term…
Abstract
The lead reservoir and feed mechanism of a knock type mechanical pencil is secured to the tubular barrel in which it is housed by a resilient locking sleeve positioned in a groove near the front of the feed mechanism and a spring compressed between a rearwardly facing internal abutment on the feed mechanism. The spring urges the lead reservoir and feed mechanism rearwardly into the barrel to a position where an external flange on the locking sleeve abuts the front end of the barrel.
Claims10
A mechanical pencil of the type having an elongate lead reservoir and feed mechanism mounted from the rear with an elongate outer barrel with the forward end of said mechanism defining a tip, said tip extending through an opening at the front end of said barrel, comprising in combination
- an external stop surface disposed on said lead reservoir and feed mechanism within said barrel and facing toward the front end of said barrel,
- a rearwardly facing abutment surface interiorly of said barrel,
- resilient means compressed between said abutment surface and said stop surface for urging said lead reservoir and feed mechanism rearwardly in said barrel,
- an external annular groove on said tip of said lead reservoir and feed mechanism
- said annular groove extending from a location rearward of said forward end of said barrel to a location forward of said front end of said barrel,
- a resilient, radially compressible, elongate locking sleeve disposed o said annular groove, and being compressible radially inwardly on said groove during the mounting of said feed mechanism in said barrel,
- said sleeve having at the forward end thereof radially extending stop means engaging the front end of said barrel to limit rearward movement of said lead reservoir and feed mechanism in said barrel, and
- said sleeve having a rearward tubular portion extending a substantial distance into said barrel from said front end to retain said sleeve on said groove.
For use in a mechanical pencil of the type having an elongate lead reservoir and lead feed cartridge mounted with an elongate outer barrel within the forward writing end of said cartridge extending through an opening at the front end of said barrel, an improved lead reservoir and lead feed cartridge comprising in combination
- an external annular groove in said cartridge disposed near said forward writing end,
- a generally tubular, radially compressible sleeve mounted in said groove,
- said sleeve having an external, rearwardly facing stop surface near forward end thereof for selective engagement with said barrel,
- said groove having an intermediate section and spaced front and rear sections,
- said intermediate section being deeper than said front and rear sections.
Dependencies are inferred from the claim text.