JPH022189U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a sharpening pencil embodying the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1,
Figure 3 is a sectional view taken along the line - - in Figure 1, and Figure 4 is a cross-sectional view of Figure 1.
FIG. 5 is a front view of the rotary cam, FIG. 6 is a side view of the cam, and FIGS. 7 to 9 are longitudinal sectional front views showing the operating state of the sharpening pencil. In the figure, A: sharp pencil, 1: barrel, 1a
: Tip half of barrel, 1b: Rear half of barrel, 2: Chuck, 3: Retraction spring, 4: Tightening ring, 5: Pressing spring, 6
: Movable ring, 7: Core case, 12: Rotating cam,
12a: Upper sliding surface, 12b: Lower sliding surface, 13: Upper projection, 14: Lower projection, 15: Upper latching portion, 16: Lower latching portion, 17: Rotation cap, 19: Guide groove.

Claims (1)

[Scope of utility model registration request] A chuck connected to a lead case supported in the axial direction so as to move back and forth in the shaft cylinder is urged in the retracting direction by a retraction spring, and the chuck is fitted into the tightening ring to grip and tighten the writing lead. In a sharp pencil in which the writing lead is pushed out and released by being pushed out from the ring toward the tip, a push spring is provided inside the tip of the barrel, and the chuck can be fitted and removed between the push spring and the tightening ring. A movable ring is provided, the inner surface of the movable ring is formed into a substantially mortar shape, and a cylindrical rotating cam is fitted on the outer periphery of the rear half of the shaft cylinder, and a rotating cap is fitted on the outer periphery. The rotary cap is fitted into the shaft cylinder so as to be rotatable in the forward and reverse directions, and a serrated upper sliding surface with the same tooth height as the extrusion stroke of the chuck is formed on the upper peripheral edge of the rotary cam. At the same time, an upper restraining part is formed at the bottom of the teeth of the upper sliding surface to prevent the upper projection from reversing, and the lower peripheral edge of the rotary cam is connected to a push spring from the retracted position of the chuck. A serrated lower sliding surface with a tooth height matching the stroke until the core is compressed is formed, and a lower protrusion that is integrated with the core case is engaged with this lower sliding surface, and the lower protrusion is pivoted. It is slidably held by a guide groove provided in the axial direction along the cylinder, and a lower catch part is formed at the tooth bottom of the lower sliding surface to abut against the lower protrusion and prevent forward rotation of the rotary cam. structure.