Patent GB-197788-A (GB)
Title: Pencil and like holders
IPC: B43K21/08
Filed: 1922-03-13
Abstract: 197,788. Gilman, G. W. March 13, 1922. Pencil and like holders; erasers.-In a pencil or like holder of the type in which the lead &c. is advanced by the relative rotation of an openended spirally-threaded sleeve, yielding means are provided at each end of the sleeve, between which and the sleeve the projection on the plunger is adapted to ride should the mechanism be rotated too far in either direction. The lead 14, Fig. 4, is held in a tube 20, the forward end of which is forked to act as a clutch for the lead, and is fed forward by a plunger 32 which is also clutched by the tube 20, the body of the plunger being slit for this purpose. The tube is slidably mounted in a tube 24 so that it can be moved by the plunger, although it is normally held against forward movement by engagement of its end with an annular shoulder 30 in a guide-member 29, which is pressed into the conical end of the casing 2 by springs 62, 64. The projection 34 on the plunger slides in slots in the tubes 20. 24 and engages a spiral slot in an open-ended sleeve 38 surrounding the tube 24. The springs 62, 64 yieldingly hold collars 66, 68 respectively against the ends of the sleeves 38, so that, when the projection 34 on the plunger passes out of the spiral slot, the corresponding spring is compressed, and further rotation causes no damage to the parts. The spring 62 is held between the collar 66 and a collar 70 slidable on the tube 24 and limited in its movement by a pin engaging the slot in the tube. The sleeve 38 is secured to a collar 50 provided with a projecting pin 52 engaging a hook 54, Fig. 2, on a collar 56 frictionally or otherwise secured in the casing 2. A tube 55 is held in place in the collar 56 by a spring so arranged that when the parts are assembled the hook 54 and pin 52 are yieldingly held in engagement, the tube 55 being pressed down against the action of the spring by the collar 50. The tube 24 is secured to a collar 80 and a tube 46, the spring 64 being mounted in opposing recesses in the collars 50, 80. To enable the mechanism to be removed from the casing, the opposing faces of the collars 50, 80 are provided with clutch teeth normally held out of engagement by the spring 64 which is weaker than the spring 62. The teeth are engaged by pushing in the tube 46, further movement causing the compression of the spring 62 and the movement forward, relatively to the, casing 2 and guide 29, of the whole of the mechanism, so that, on rotation, the hook 54 and pin 52 are disengaged. The tube 46, which projects beyond the end of the casing 2, serves as a receptacle for spare leads, and its open end is closed by a screwthreaded extension 94 of a cup 96, Fig. 6, carrying an eraser 16 normally covered by a cap 18. The cup is provided with a number of teeth which bite into the eraser, and to compensate for wear, the eraser is pushed out of the cup by an instrument inserted through the bore of the extension 94. The tube 46 is provided with one or more projecting pins 100 engageable with a corresponding number of hooks 98, Fig. 2, integral with a collar 102 secured in the cap. The advance of the lead is therefore obtained by turning the cap 18 relatively to the casing 2, the slotted tube 24 being secured, through the medium of the tube 46 to the cap, and the sleeve 38 through the collar 50 to the casing. To remove the cap, it is pressed. inwards against the action of the conical spring 104 secured in the cap and rotated slightly to disengage the hooks 98 and pins 100. The cap is in the form of a substantially cylindrical-shaped shell and is provided near its outer end with an annular shoulder, on which, after the parts of the cap have been assembled, a cover-plate 109 is placed and secured by spinning over the open end of the shell. A pocket clip 6 may be provided having tongues which are inserted through slots in the casing and bent over against the inner wall.