Patent GB-1192116-A (GB)
Title: Writing Instrument
Inventor: BROSS HELMUT
IPC: B43K7/12
Filed: 1968-09-04
Abstract: 1,192,116. Felt nib pens. H. BROSS. 4 Sept., 1968, No. 42056/68. Heading A4K. [Also in Division B6] A rear-push-button actuated retractable writing instrument (e.g. a felt-tip or ballpoint pen) has additionally a pocket clip which when lifted away from the housing of the instrument, causes the instrument to retract. In Fig. 2, the pocket clip 5, which is integral with the push-button 3, has a locking pawl 6 which co-operates with cams formed on the outer surface of the housing 1. When the push-button is depressed from the retracted position, the locking pawl 6 is first pushed against a guide edge 8 so that it is deflected transversely and longitudinally, as shown in dashdotted line, to abut guide edge 19. Releasing the pressure allows the retract spring 4 to move the push-button and therefore the pawl 6 into the locked, projected position defined by guide edges 9 and 13. Further depression of the push-button 3 causes the pawl 6 to follow the dash-dotted line to the starting or retracted position. If the instrument is placed in the user's pocket, the locking pawl 6 is moved away from the cams so that the retracted position is achieved. An additional locking pawl 25, Fig. 2, is provided on a resilient arm 24 attached to push-button 3, this pawl cooperating with an aperture 26 in the housing which defines the retracted position. This additional pawl 25 also prevents the push-button from escaping from the housing 1. The web 511 between the push-button and the pocket clip slides in an axial slot 27 in the housing 1 and prevents rotation of the push-button. (Fig. 6) illustrates an alternative cam arrangement on the outer surface of the housing 1 which co-operates with a locking pawl on the pocket clip. In (Figs. 7 and 8) the pocket clip is connected to a push-button which is adapted to swivel in the housing 1 when the clip is lifted from the latter. The push-button is provided with two pawls (6 and 25) radially resiliently urged outwardly. Cams on the inner surface of the housing 1 co-operate with locking pawl (6) to define the retracted and projected positions. The other pawl (25) co-operates with a recess in the housing upon lifting the pocket clip. In (Figs. 9 and 10) conventional push-button operated projecting mechanisms are provided (i.e. alternate long and short axially aligned grooves; heart-shaped cam mechanism) which are latched in an operative position by a locking pawl (25) on the pocket clip. Lifting the pocket clip disengages the pawl and allows the mechanism (pushbutton included) to assume a retracted position. In (Figs. 11 to 14) the locking pawl (25) on the clip (5) or associated therewith, co-operates with a cam mechanism on an integral part of the push-button (3) via an aperture in the housing. The push-button is prevented from leaving the housing by an annular flange (45) on the inner, rear end of the housing, the flange defining the retracted position. Felt-nib pens. In Fig. 3, the felt-nib 49 is surrounded by a tube 50. When the pen is projected, the tube is guided through the forward aperture of the housing by projections 51. The gap a is sufficiently large to prevent ink being drawn into the gap by capillary action. A cup shaped resilient cap 52 masks the nib from the aperture, when the nib is in the retracted position, and is capable of expanding when the nib is pushed forward.