GB191328857A - Improvements in or relating to Fountain or Reservoir Pens. - Google Patents

Abstract

28,857. Bradley, W., and Worral, J. Dec. 15. Reservoir pens.-The piston i is arranged to slide in a cylindrical chamber d located inside the ink-containing body or barrel a, an air communication being established at k between the upper end of the chamber d and the barrel a so that, on drawing the piston upwards, air is displaced from the chamber d through the barrel, and on returning the piston, ink may be sucked into the barrel through the feed c. The chamber d engages the barrel by means of screw-threads e, a' on the chamber and barrel respectively, and the air communication may consist of a slot k at the upper end of the chamber d leading into a groove j on the screw-threaded portion e, or of one or more apertures situated at the upper end of the chamber d. A tubular end piece f screws on tu the threaded portion e and contains packing- material g through which the piston-rod h is guided. The outer end of the piston-rod is provided with a head h<1>, which may be rotatable on the rod h and screw into the end piece f, or may engage the end piece f with a sliding fit or by means of a bayonet-lock. The rod h has an internal passage h<3> terminating at the rear end in an orifice h<2> through which air enters into or is expelled from the lower end of the chamber d during the reciprocation of the piston i. The chamber d is preferably constructed of metal, such as aluminium.