JPS5828877Y2 - feeding mechanism pencil - Google Patents

Description

[Detailed explanation of the invention] Conventional pencils with a knock-type feeding mechanism had a lead fixing chuck only inside the barrel, so the lead was worn out by writing and the distance between the chuck and the tip of the barrel was shorter than the distance between the chuck and the tip of the barrel. This cannot be fixed.

For this reason, there is a large amount of remaining lead that is discarded, which is uneconomical, and since the tip of the lead is not fixed, there is a drawback that the lead is unstable when writing.

Furthermore, by providing one more chuck outside the tip of the shaft cylinder, the above-mentioned drawbacks can be eliminated, but there are disadvantages in that the number of parts increases and the assembly is complicated.

Therefore, the present invention provides a pencil with a knock-type dispensing mechanism that is provided with chucks on the inside and outside of the barrel as described above, requires fewer parts, and is easy to assemble.

FIG. 1 is a longitudinally sectional front view of the main parts of the embodiment of the present invention, in which the shaft cylinder has a base 1 connected to a base 3 with a joint 2, and a step 4 is formed on the inner surface.

A three-split circular chuck 6 for fixing the base of the pencil lead 5 is slidably accommodated inside this barrel, and the tail end of a core membrane container 7 screwed onto the tail end of the chuck 6 is made to protrude from the barrel. By fitting the lid body, the knock button 8 is shaped.

Further, a movable cylinder 9 is slidably fitted into the core fixing portion at the tip of the inner chuck 6, and the tightening ring 10 of the inner chuck is housed inside the cylinder, and the core is held lightly. A holding body 11 made of flexible rubber or the like is fixed thereto.

A lid body 12 is screwed onto the tail end of the cylinder body 9, and a tightening ring 10
can slide between the lid and the stepped portion 13 on the inner surface.

Further, the cylindrical body 9 is provided with a hole 14 for removing core waste, and a three-pronged external chuck 1 for fixing the tip of the core 5 is provided at the tip.
5 are connected and their core fixing portions are made to protrude from the base 3.

Note that the core fixing portion can pass through the cap when the core 5 is not inserted, but when the core is inserted, it is tightened at the tip of the cap to fix it.

Further, as shown in FIG. 2, both ends have a stepped portion 16 with different outer diameters, and the pitch P of the large diameter portion 17 is sufficiently larger than the pitch q of the small diameter portion 18 to form the large diameter portion. A helical spring 19 whose elasticity is larger than that of the small diameter portion is shaped by i silkworm wires, this spring is fitted into the inner chuck 6, and the stepped portion 16 is engaged with the stepped portion 4 on the inner surface of the shaft cylinder. As a result, the tip of the large diameter portion 17 presses the core membrane tube 7 toward the tail end of the barrel, and the tip of the small diameter portion 18 pushes the movable cylinder 9 toward the tip of the barrel.

In the above-mentioned mechanical pencil, when the knock button 8 is pressed, the cylinder body 9 moves until it hits the inner surface of the base, and the outer chuck 15 touches the lead 5.
is released, and the inner chuck 6 moves further with the core fixed, and when the tightening ring 10 hits the stepped portion 13, the core 5 is released.

Next, when the knock button is released, the inner chuck 6 moves toward the tail end of the barrel due to the strong elasticity of the large diameter portion 17 of the spring 19, and is tightened by the tightening ring 10 to fix the core 5.

The small diameter part 18 of the spring 19 is compressed by the strong elasticity of the large diameter part 17, and the cylinder body 9 moves toward the tail end, and the outer chuck 15 is tightened at the tip of the cap 3 to fix the core. The lead is fed out by such an action.

Further, during assembly, the tightening ring 10 and the lid 12 are inserted into the inner chuck 6 from its tail end, and the chuck is screwed onto the core number tube 7, and then the spring 19 and the cylinder 9 are attached to the chuck. The lid body 12 is screwed onto the cylinder body 9, these are inserted into the cylinder from the tail of the cylinder, and the cap 3 is attached.

As described above, the mechanical pencil of the present invention can be assembled extremely easily.

Further, since only one spring is required and no parts for a spring holder are required, the number of parts is small and the structure is simple.

Furthermore, since the pencil lead can be securely fixed at its tip, it can be used until it is almost completely worn out, making it extremely economical.

[Brief explanation of drawings]

FIG. 1 is a longitudinally sectional front view of the main part of the embodiment of the present invention, and FIG. 2 is a front view with the helical spring in FIG. 1 taken out. In the figure, 1 is the base of the barrel, 2 is the joint, 3 is the base, 4 is the step, 5 is the pencil lead, 6 is the inner chuck, 7 is the core number tube, 8 is the knock button, and 9 is the movable tube. body, 10 is a tightening ring, 11
is a core holder, 12 is a lid, 13 is a step, 14 is a hole, 15
16 is the stepped part of the spring, 17 is the large diameter part, 18 is the outer chuck.
1 is a small diameter portion, and 19 is a helical spring.

Claims (1)

[Scope of utility model registration request] The core membrane tube is connected to the tail end of an inner chuck which is slidably housed in the shaft cylinder and fixes the base of the core, and the movable cylinder housing the tightening ring of the inner chuck is attached to the tip of the inner chuck. An outer chuck is connected to the tip of the movable tube, and the outer chuck protrudes from the tip of the shaft tube and fixes the tip of the core by being tightened by the tip of the tube, and the outside diameters of the two ends are different. A helical spring having a stepped part in the middle and having a pitch of a large diameter part larger than a pitch of a small diameter part so that the elasticity of the large diameter part is larger than that of the small diameter part is formed using a single metal wire. By fitting into the inner chuck, the stepped portion engages with the stepped portion on the inner surface of the shaft cylinder, and the tip of the large diameter portion presses the core membrane tube toward the tail end of the shaft tube, while the tip of the small diameter portion moves. A pencil with a feeding mechanism that presses the cylindrical body toward the tip of the barrel.