Patent GB-300677-A (GB)
Title: Improvements in and relating to pencil holders
IPC: B43K29/06
Filed: 1927-08-17
Abstract: 300,677. Grimmer, G. S. M. Aug. 17. 1927. Pencil holders pencil sharpeners. -In a pencil holder of the type provided with resilient members between which the lead is adapted to be moved axially for sharpening purposes, the sharpening-members are in the form of chisel-edged cutters having a straight or curve cutting-edge, and the lead is carried by a spring-controlled plunger and is moved inwardly, against the action of the spring, by pressure on the point. As shown in Fig. 1, the lead is mounted in a carrier 14 slidable in a sleeve 17 which is adapted to be secured in adjusted position in the barrel 10 by a screw 18 passing through a slot in the barrel. The carrier 14 is under the influence of a spring 16 in the rear end of the barrel. Spring sharpening-blades 20, having a flat cutting-edge, and of a width equal at least to the diameter of the lead, are mounted on the conical front end of the barrel, and give a chisel point to the lead when it is reciprocated. In a modification. the sleeve 17 is adapted to be adjusted in the barrel by screwing, and the blades 12 are enclosed by a slotted cap. which tends, when pushed inwardly with the lead during the sharpening-operation, to force the into contact with the lead. In another modification, adapted for giving a conical point to the lead, a pin projects from the barrel into a cam groove in the carrier 14 so as to cause a rotation, always in the same direction, for every complete strobe of the carrier, a certain amount of lost motion being arranged for so that the rotation takes place only at the end of the stroke. In the form shown in Fig. 6, the lead carrier 14 is in two parts, one of which is in the form of a sleeve 38 loosely mounted for longitudinal movement between collars 39, 40 on the other part 41. The sleeve 38 is formed with a helical slot engaged by a pin 50 in a tubular member 36, formed with a screw-thread engaged by a pin 37 in the barrel. The tubular member 36 is-provided with a flattened extension 34 passing through a correspondingly-shaped opening in the end of a cap member 21 rotatable in the end of the barrel. The end of the sleeve 38 is formed with ratchet teeth adapted to be engaged by a tooth or teeth on the underside of the collar 40. Mounted on a reduced portion 42 of the barrel, for rotation but not longitudinal movement, is a sleeve 33 having a pin 45 engaging a longitudinal slot 46 in a cap-member 25 slidable on the extension 42, to which are also secured the sharpening- blades 20. The slot 46 is formed with two side slits, one of which is provided with an opening to the rear end of the cap 25 to enable it to be disconnected. To sharpen the lead, the point is pressed on to a table so as to force the carrier 14 inwardly against the action of the spring 16 which is confined between the collar 40 and the bottom of the tubular member 36. The end 26 of the cap 25 then engages the table and is also pushed in against the action of a spring 27, and acts to force the blades more tightly against the lead. When the, pressure is released, the spring 27 moves the cap forward and releases the pressure on the blades. The spring 16 then pushes the part 41 of the carrier forward until the teeth on the sleeve 38 are engaged by the tooth or teeth on the collar 40, so that, on further movement, the carrier is caused to turn as a result of the engagement of the helical slot with the pin 50. This causes a different surface of the lead to be presented to the blades for the next operation. In order to hold the lead against being pushed inwardly by pressure on the point during writing, the cap 25 is pushed inwardly, and the cross slot engaged with the pin 45, thus forcing the blades into contact with the lead.