JPH0116632Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotating retractable notch type sharp pencil, and more specifically, a rotary retracting notch type sharp pencil that allows the lead to be drawn out only when the writing part at the tip of the refill protrudes from the opening at the tip of the barrel. This is about a mechanical pencil.

By rotating the rear shaft in the forward and reverse directions with respect to the front shaft, the refill of the Knock-type sharp pencil housed there is moved forward and backward, and when moving forward, the writing part at the tip of the refill protrudes from the opening at the tip of the front shaft, allowing writing. With a rotating retractable lock type sharp pencil that retracts into the front shaft when retracting, if the lock is repeatedly operated unexpectedly when the writing part is retracted, the lead will extend out for a long time, causing the lead to break when the writing part protrudes. There were some problems, such as it not closing.

Therefore, the purpose of the present invention is to use a simple structure in the above-mentioned rotary retractable notch type sharp pencil to make the notch operation impossible when the writing part is recessed. A cylindrical clutch is connected to the knob so that it can be displaced at right angles to the axial direction, and a displacement pawl that is attached to the clutch and elastically protrudes from its outer circumferential surface is attached to the rear of the clutch. It is equipped with a cylindrical clutch pendulum that comes into contact with the inner peripheral surface of the shaft and is biased so as to be displaced perpendicularly to the axial direction and become eccentric, and when the refill is retracted, the rear end enters the clutch pendulum. The axes of the two are aligned, and the rear edge faces the front edge of the clutch, making it impossible to knock. When the refill moves forward, the rear end moves out of the clutch pendulum, causing the clutch to move in the axial direction. Displaced and eccentric at right angles to the
The foregoing object is achieved by constructing the clutch so that a portion of the front edge of the clutch faces a core cap fitted into the rear end opening of the core case in the refill and can be clicked.

Embodiments of the present invention will be specifically described below with reference to the drawings.

The front shaft 1 is a cylindrical body having a tip opening 1a,
An actuating tube 2 is rotatably connected to the inside thereof, the rear end of which protrudes from the rear end opening of the front shaft 1, and a spiral inner projection 2a is provided. The reflex pencil 3 housed in the front shaft 1 is a conventionally known knock-type sharp pencil that has a built-in lead holding mechanism consisting of a chuck and a chuck ring (not shown).
A cylindrical actuator 4 is fixed to its outer periphery, and a spiral groove 4a corresponding to the inner protrusion 2a is provided on the outer circumferential surface of the actuator 4, and these grooves are engaged. A key pipe (not shown) is fitted into the vertical groove of the actuator 4, so that the refil 3 cannot rotate with respect to the front shaft 1. A rear shaft 6 is removably press-fitted to the rear end of the operating tube 2, and when the rear shaft 6 is rotated with respect to the front shaft 1, the operating tube 2 rotates, and the refil 3 moves forward and backward. . When the refill 3 moves forward, the writing part 3a at the tip is opened at the tip opening 1 of the front shaft 1.
The writing portion 3a protrudes from the front shaft 1 so that it can be written on, and when the writing portion 3a is retracted, the writing portion 3a is recessed into the front shaft 1.

Next, a knock button 7 is fitted into the rear end opening of the rear shaft 6 and is biased rearward by a knock spring 8 so as to be movable back and forth. A cylindrical holding member 71 with a bottom and a hole 71b formed in the bottom surface 71a is fixed in front of the button 7. The flange 91 of the clutch 9 is supported by the bottom surface 71a, and the clutch 9 is held in a suspended state by the holding member 71. Here, the outer diameter of the neck 92 of the clutch 9 is considerably smaller than the inner diameter of the hole 71b, and the clutch 9 is held movable at right angles to the axial direction. The inner diameter of this clutch 9 is larger than the outer diameter of the core cap 11 fitted into the rear end opening of the core case 10 in the refil 3, so that the core cap 11 can enter into the clutch 9, and the outer diameter is smaller than the outer diameter. It is approximately equal to the outer diameter of the rear end portion 4b of the child 4, and the edges of the end faces are also approximately equal. And clutch 9
A cylindrical clutch pendulum 12 with a tapered inner surface is slidably mounted on the outside of the clutch pendulum 12.As shown in FIG. The displacing pawl 12a protrudes from the rear shaft 6 and is biased so as to come into contact with the inner circumferential surface of the rear shaft 6 and to be displaced perpendicularly to the axial direction and become eccentric.

In the rotary retractable-knock type sharp pencil having the above structure, when the rear shaft 6 is first rotated for writing, the refill 3 moves forward, and the rear end 4b of the actuator 4 is moved from the clutch pendulum 12 as shown in FIG. It is located at the front, and the top surface of the core cap 11 is positioned with a slight play left behind the front edge of the clutch 9. At this time, the clutch pendulum 12 in a free state from the rear end 4b of the actuator 4 is eccentric due to its own biasing force, and therefore the clutch 9 is also eccentric.
Due to this eccentricity, a portion of the front edge of the clutch 9, which is larger than the top surface of the core cap 11, faces this top surface in a crescent shape as shown in FIG.
To feed out the lead core, all you have to do is knock the knock button 7 with the tip of your finger, and this knocking force is transmitted to the knock button 7, clutch 9, lead cap 11, and lead case 10, which move them forward. The core holding mechanism is released.

Next, when writing is finished, the rear shaft 6 is rotated in the opposite direction to retract the writing part 3a, which causes the refill 3 to retreat. Then, the rear end portion 4b of the actuator 4
Even if the clutch pendulum 12 is eccentric, since the tip of the inner surface thereof is tapered, the clutch pendulum 12 enters the inside thereof and aligns their axes as shown in FIG. 3. When the retraction is completed, the core cap 11 enters into the clutch 9, and the rear end portion 4b faces the front edge of the clutch 9, leaving a slight play. Therefore, even if the knock button 7 is pressed in this state, the clutch 9 collides with the rear end portion 4b of the actuator 4 without pressing the core cap 11, making it impossible to knock.

In this way, the present invention uses a simple clutch mechanism to intermittent the knocking force, so when the writing part is recessed, even if the knocking button is pressed unexpectedly, the knocking becomes impossible and the lead core does not come out.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, Fig. 2 and Fig. 3 are cross-sectional views showing the main parts, Fig. 4 is an explanatory diagram of the position of the clutch and core cap, and Fig. 5 is a diagram of the clutch pendulum. FIG. DESCRIPTION OF SYMBOLS 1... Front shaft, 2... Operating tube, 3... Refill, 3a... Writing part, 4... Actuator, 4b... Rear end part, 6... Rear shaft, 7... Knock button, 9... ...Clutch, 10... Core case, 11... Core cap,
12...Clutch pendulum, 12a...Displacement pawl.

Claims (1)

[Scope of utility model registration request] By rotating the rear shaft in the forward and reverse directions with respect to the front shaft, the refill of the Notsuk-type mechanical pencil housed there moves back and forth, and when moving forward, the tip of the refill protrudes from the opening at the tip of the front shaft, making it possible to write, and it also moves backward. In the case of a sharp pencil that is sometimes recessed into the front shaft, there is a dowel button that is retractably inserted into the rear end opening of the rear axle, and a cylindrical clutch that is connected to the dowel button so that it can be displaced at right angles to the axial direction. , a cylindrical displacement pawl that is externally attached to this clutch and elastically protrudes from the outer peripheral surface of the clutch is biased so that it comes into contact with the inner peripheral surface of the rear shaft and is displaced at right angles to the axial direction, causing eccentricity. Equipped with a clutch pendulum, when the rewheel is retracting, the rear end enters the clutch pendulum to align the axes of the two, and the rear end lip faces the front end lip of the clutch, making it impossible to knock, and at the same time preventing the refill from moving forward. When the rear end exits from the clutch pendulum, the clutch is displaced perpendicularly to the axial direction and becomes eccentric, and a portion of the front edge of the clutch is fitted into the rear end opening of the core case in the refill. A rotating retractable sharpener pencil that can be pressed while facing the lead cap.