| 摘要 |
893,814. Reservoir pens. D.C.B. Ltd. Aug. 6, 1958 [Aug. 6, 1957], No. 24751/57. Class 146(3) A ball-point pen nib 1 is moulded or die-cas<SP>t</SP> so that the base seating for the writing ball is constituted by a circular series of spaced mounds or projections 2, the spaces 3 between adjacent mounds &c. forming ink channels to permit flow of ink around the rear of the ball. The mounds &c. 2 may be of conical or frusto-conical form, and may either be pre-shaped to form seating surfaces, or may be deformed by the ball to form seatings during the peening &c. process of the nib tip. The nib carcass may be composed of tin-alloy, nylon, or other deformable material which can be moulded or die-cast. As shown in Fig. 5, apparatus for forming the nib 1 comprises a mould member 7 and two co-axial opposed core pins 9, 10, the pin 9 having five conical depressions 11 spaced in a circular series around the pin to form the mounds &c. 2. The depressions 11 may be formed in the pin 9 by a spark erosion process, a lapping or grinding process, or by an ultrasonic percussion process (Figs. 6-8, not shown), using mountings for the pin which can be accurately indexed. The base and lateral sealings for the writing ball may be formed separately. |
