Patent GB-870795-A (GB)
Title: Improvements in or relating to stylographic reservoir pens
IPC: B43K8/24
Filed: 1958-01-06
Abstract: 870,795. Reservoir pens. EXNER, H. A. A. Jan. 6, 1958, No. 444/58. Class 146(3). ,A stylographic fountain pen having a retractable writing element comprises a tube whose inner and outer diameters increase in steps from the writing element tip towards the rear end of the pen, and an ink-needle loosely lodged in the said tube, the diameter of the ink needle being also increased in steps from its writing tip towards a counterweight at its rear end and a part of the needle co-operating with a seat formed by one of the steps inside the tube to constitute a stop valve for the ink. Point-retracting arrangements. The pen has a barrel 10 including an upper portion 39 in threaded engagement with the main portion. A cylindrical member 23 closed at its lower end by a member 11 constitutes the reservoir and is slidable within the barrel against the rearward bias. of a spring 12. A carrier-tube 13 having a spiral air channel 14 is pressfitted into the front end of the member 11 and itself houses a guide-tube 17. A tube 20 is rigidly secured in the guide tube 17 and constitutes the- -writing point. The parts 13, 17, 20 which together form an internally and externally stepped tube may be constructed as an integral unit. The ink-needle 21 is slidable in the tube 20 and is secured at its rear end to the counter weight 22 in the reservoir whose axial movement is restricted by a step in the member 11 and the front end of the cylindrical member 23. Sleeves 25, 26 are pushed over the ink-needle or may be formed as an integral part thereof to give it a stepped outer configuration. The front end of the tube 25 is tapered to mate with a correspondinglyshaped opening in the rear end of the tube 20 so that when they are brought into contact by the sudden retraction of the writing tip the supply of ink to the tip is temporarily cut off. The needle passes through central holes in a number of discs 29 which define capillary spaces in a chamber 28 in the member 11 and through a central hole in a closure 30 at the rear of the chamber, said chamber ensuring an even flow of ink to the writing tip. A chamber 18 in the front end of the barrel 10 is constructed in similar fashion to the chamber 28,and the tube 17 is slidable in central holes in discs 19 therein. The front end of the chamber 28 is closed by one or more rubber discs 31 having a central aperture 32 through which the writing point wetted by ink contained in the chamber can be projected. A hollow push-button 37 is siidable but keyed against rotation as at 40 in the rear barrel portion 39. and houses in its front end with a friction fit a bushing 35 which is secured to the cylindrical reservoir member 23 by a spring ring 36. A lever 42 is pivoted at 43 within a pocket clip 44 and has a latch portion 45 which in the retracted position of the pen is urged by a spring 46 against the side of a sleeve 47 surrounding the push-button 37. The writing point is projected from the position shown in Fig. 2 by depressing the push-button until the latch 45 engages behind the sleeve 47 thus maintaining the point in writing position as shown in Fig. 3. The lever 42 is rocked manually to disengage the latch 45 and allow the spring 12 to retract the point. Afternatively the pocket clip may itself form the latch lever. Grooves 50 in the barrel 10 release air compressed by the longitudinal movement of the reservoir. Self-filling arrangements. A piston 33 is slidable but keyed) against rotation in the reservoir and is rigidly secured to a threaded shaft 34 which passes through a tapered' aperture in the rear end of the cylindrical member 23 and is accommodated inside the pushbutton 37, the threads engaging corresponding threads in the bushing 35 and a tapered part 38 of the shaft normally sealing the tapered aperture in the member 23. To fill the pen the barrel part 39 is unscrewed and the internal parts of the pen are removed as a unit. The writing end of this unit is inserted in ink to above the lower end of the member 11 and the push-button 37 fs rotated in relation to the reservoir 23 so as to reciprocate the piston 33 in the reservoir, ink being sucked in. through the air channel 14.