730,295. Reservoir pens. SHEAFFER PEN CO., W. A. July 11, 1952 [Nov. 17, 1951], No. 17521/52. Class 146(3). A reservoir pen comprises a nib, a feed-bar adjacent the nib, a filling tube mounted in the feed-bar spaced from the nib, the tube having a forward end extensible to a position forwardly of the tip of the nib and retractable to a position rearwardly of the tip of the nib, an opening at the forward end of the tube, and a capillary passageway communicating between the nib and the forward end of the tube when retracted to the rearward position. As shown, the feed-bar 308, Fig. 1, has an axial bore 322 in which the filling tube 328 is reciprocable so as to project the front end of the tube 328 into a filling position in advance of the tip of the nib 310. The tube is carried by a plug 346 fitted in the end of a collapsable sac 336 and surrounded by a sheath 344 having threads 347 cooperating with internal threads in a nut 360 on the end of a plunger tube 352. The plug 346 is rotationally restrained by a collar 362 carrying projections engaging longitudinal grooves 366, such that on rotation of a cap 302, Fig. 2, attached to the plunger tube 352, the plug and tube are advanced from the retracted position as shown in Fig. 1, the collar 362 being pressed forwardly by a spring 368. The projected end of the tube 328 is then immersed in ink, the sac 336 then being deflated, by reciprocation of the plunger 352, in the manner described in Specification 720,467. Ink is drawn into the reservoir during filling through the tube 328, any ink adhering to the end of the tube 328, will after retraction of the tube, be communicated through capillary passageways 342, 340, 324 and 312 to the tip 316 of the nib. Ink is supplied to the passageway 342 during writing along a feed passageway 334 within the tube, while air to replace ink consumed is supplied to the sac 336 along an air vent 332 in the tube 328. Ink displaced from the reservoir, on account of pressure or temperature changes therein, is accommodated in ink overflow spaces 318 and 320 connected by the passageway 324. The nib 310, which is of tubular form, is screwed to a collar 306 screwed into a nib-section 304 attached to the pen barrel 300. yield bodily when engaged by the nose to accommodate inaccuracies in their manufacture. As shown, a stem a is enclosed by the nose f and is extended by a collet h of soft material, such as rubber or polythene. The collet h receives the feed-bar b and nib c. In a modification, part of the rear end of the feed-bar may be replaced by a collet of resilient material or a thin sleeve of resilient material may be interposed between the feed-bar and the surrounding stem. In a further modification, both the stem and feed-bar may be formed of resilient material at their joint, the resilient parts in each case being bonded to the remainder.