JP3852172B2 - Sharp pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sharp pencil in which a chuck body for gripping and releasing a core is disposed in a shaft cylinder, and the core is extended by pressing a knock member.
[0002]
[Prior art]
Japanese Utility Model Laid-Open No. 61-125482 is known as a sharp pencil having a knock member for operating the lead feeding mechanism at the rear end of the shaft cylinder of the sharp pencil incorporating the lead feeding mechanism. A slider member on which a sliding contact piece for holding the core is formed is disposed in front of the chuck body inside the tip so as to be movable back and forth. A lead guide is fixed to the tip of the slider member. Further, a lead tank is attached to the rear of the chuck body, and a knock member for moving the chuck body back and forth and feeding the lead is detachably attached to the rear part of the lead tank.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, since the slider member is retracted as the lead is worn by writing, writing can be performed even if the lead is immersed in the lead guide, and the lead is not exposed. Although the breakage at the middle part of the core can be prevented, the tip of the lead is reduced by writing and the tip of the lead becomes an acute shape, and if you change the sharp pencil in that state and write again, the sharp part becomes It breaks due to impact and writing pressure when it comes into contact. When writing in a broken state, the tip of the broken core was caught on the paper surface, which was very uncomfortable.
In addition, when the tip of the lead is reduced, the end surface of the lead becomes elliptical, and as a result, the width of the writing line gradually increases. Here, in order to maintain the width of the thin writing line, there is a method of writing with a thin diameter lead, but the breakage strength is reduced because the lead is thin.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and a chuck body for gripping and releasing a core is disposed in a shaft cylinder, and a knock member disposed on a side surface of an intermediate portion of the shaft cylinder is provided. A sharp pencil for feeding a lead by pressing, a slider that moves forward by pressing the knock member is disposed in the shaft cylinder, and a lead tank is slidable inside the slider. In addition, the hook body is formed in front of the lead tank to contact the front end surface of the slider, and the chuck body is fixed to the front of the lead tank, and the rotor cannot be rotated in the lead tank. attached is in, along with the rotatably arranged relative to the barrel, a slider disposed behind the rotor, the Tantsuba portion after forming the lead tank to the rear end surface of the slider brought into contact, the knock The lead tank by pressing action wood, as well as moved the slider, the allowed to rotate the rotor by movement of the slider, rotates the chuck body fixed to the lead tank by the rotation of that rotor The gist of the present invention is to provide chuck body rotating means.
[0005]
【Example】
A first example will be described with reference to FIGS. By arranging the knock piece (knock member) 30 on the side surface of the intermediate portion of the shaft tube 1, the core can be rotated and the core can be fed out without changing the shaft tube 1 (sharp pencil). This is an example. This will be specifically described below. A slider 31 is arranged on the inner side of the shaft cylinder 1 so as to be able to move back and forth. On the side surface of the slider 31, two pressing protrusions 33 each having an inclined surface 32 are formed in the front and rear. . On the other hand, on the side surface of the knock piece 30 disposed in the window hole 34 formed on the side surface of the shaft cylinder 1, an engagement piece 34 that contacts and slides on the inclined surface 32 of the pressing convex portion 33 is formed. ing. In addition, an inclined surface portion 35 is formed on the engagement piece 34 in order to improve the contact / slidability with the pressing convex portion 33.
[0006]
A lead tank 36 is slidably disposed inside the slider 31, and a flange 37 is formed in front of the lead tank 36 to contact the front end surface of the slider 31. Further, vertical ribs 38 are formed on the side surfaces of the core tank 36 in front of the collar portion 37 at opposing positions.
A relay member 39 is disposed in front of the core tank 36 in a state of being urged rearward by the elastic member 40. A large-diameter cylindrical portion 41 is formed behind the intermediate member 39, and a vertical groove 42 in which the vertical rib 38 of the core tank 36 engages and slides is formed on the inner surface of the large-diameter cylindrical portion 41. Is formed. A chuck body 3 and a chuck ring 4 are provided in front of the intermediate member 39 as in the previous example. Reference numeral 5 denotes a tip member that is detachably attached to the front end of the shaft tube 1, and a core detent member 6 is inscribed therein.
[0007]
A protrusion 43 is formed at a position opposite to the rear of the core tank 36, and the protrusion 43 is provided in the slit 12 of the rotor 11 at a position where it cannot rotate but can move back and forth. . Further, a slider 13 is disposed behind the rotor 11. The vertical ribs 19 and 21 formed on the rotor 11 and the slider 13 are engaged with the vertical groove 25 of the cam portion 23 so as to be movable back and forth. The cam portion 23 is formed separately from the shaft cylinder 1. Further, a rear end flange 44 is formed at the rear end of the lead tank 36 so that it can come into contact with the rear end surface of the slider 13.
An annular ring 45 is fixed inside the intermediate portion of the shaft cylinder 1, and an elastic member 46 is stretched between the annular ring 45 and the rotor 11.
Reference numeral 47 denotes a cap, and a clip 48 is formed integrally with the cap 47.
[0008]
Next, the operation will be described (see FIGS. 5 and 6). While writing, if the lead is reduced and the writing line becomes thicker, either press the knocking piece 30 while lifting the mechanical pencil once while the lead is in contact with the paper. To do. By this pressing operation, the slider 31 moves forward, and the lead tank 36 also resists the resilience of the resilience member 46 due to the contact between the front end surface of the slider 31 and the flange 37 of the lead tank 36. While moving forward. Then, as the lead tank 36 advances, the rear end flange 44 of the lead tank 36 advances the slider 13. As the slider 13 advances, the angled inclined surface 22 of the protrusion 21 of the slider 13 presses the inclined surface 20 of the vertical rib 19 of the rotor 11. Then, the rotor 11 moves forward by this pressing operation, the vertical rib 19 of the rotor 11 is removed from the vertical groove portion 25 of the cam portion 23, and the rotor 11 is moved by the engagement between the angled inclined surface 22 and the inclined surface 20. Rotate. By this rotation, the rotor 11 is guided to the inclined surface 26 by the sliding contact between the inclined surface 26 of the cam portion 23 and the inclined surface 20 of the vertical rib 19 and by the urging force of the elastic member 46 to the rear. Rotate and retreat while being done.
[0009]
The rotation of the rotor 11 causes the lead tank 36 to rotate, and the chuck body 3 fixed to the joint member 39 and its chuck are engaged by the engagement between the vertical ribs 38 of the lead tank 36 and the slits 42 of the joint member 39. The core L held by the body 3 rotates.
At this time, since a gap is formed between the lower end surface of the core tank 36 and the intermediate member 39, the vertical rib 38 of the core tank 36 slides on the slit 42 of the intermediate member 39. The lead tank 36 is not pressed and therefore does not move forward and the lead L is not fed out.
When the lead is extended, the knock piece 30 is further pressed. By this pressing operation, the inner surface of the lower end of the lead tank 36 comes into contact with the intermediate member 39, and the intermediate member 39 is pushed forward. Then, the chuck body 3 is also moved forward by the forward pressing of the intermediate member 39, and the lead L is fed out (see FIG. 12).
[0010]
【The invention's effect】
According to the present invention, a chuck body is provided in which a chuck body for gripping and releasing the core is disposed in the shaft cylinder, and the core is extended by pressing a knock member disposed on a side surface of an intermediate portion of the shaft cylinder. A slider that moves forward by pressing the knock member is disposed in the shaft cylinder, a core tank is slidably disposed inside the slider, and the slider is disposed in front of the core tank. -Forms a flange that abuts the front end surface, and fixes the chuck body to the front of the lead tank and attaches a rotor to the lead tank in a non-rotatable manner. thereby enabling positioning, the slider is arranged at the rear of the rotor, is brought into contact with the rear end flange portion formed on the lead tank to the rear end surface of the slider, wherein the pressing operation of the knock member Core tank, average In, moved the slider, the allowed to rotate the rotor by movement of the slider, because with a chuck member rotation means for rotating the fixed chuck body to the lead tank by the rotation of that rotor The core is not reduced, the breakage of the tip of the core is prevented, and a writing line having a certain width can be drawn.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of the present invention.
FIG. 2 is a perspective view showing essential parts.
FIG. 3 is a perspective view showing a main part.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is a perspective view showing a main part.
FIG. 6 is a longitudinal sectional view showing the rotation operation of the core.
FIG. 7 is a longitudinal sectional view showing a lead feeding operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 3 Chuck body 4 Chuck ring 5 Tip member 6 Core detent member 11 Rotor 12 Slit 13 Slider 19 Vertical rib 20 Inclined surface part 21 Vertical rib 22 Angle-shaped inclined surface 23 Cam part 25 Vertical groove part 26 Inclined surface 30 Knock Koma 31 slider
32 Inclined surface 33 Pressing convex portion 34 Window hole 35 Inclined surface portion 36 Core tank 37 Gutter portion 38 Vertical rib 39 Reinforcement member 40 Repelling member 41 Large diameter cylindrical portion 42 Vertical groove 43 Protruding portion 44 Rear end flange portion 45 Ring ring 46 Repellent material 47 Cap 48 Clip

Claims (1)

A chuck pencil is provided in which a chuck body for gripping and releasing the core is disposed in the shaft cylinder, and the core is extended by pressing a knock member disposed on a side surface of an intermediate portion of the shaft cylinder, A slider that moves forward by pressing the knock member is disposed in the shaft tube, a core tank is slidably disposed inside the slider, and a front end surface of the slider is disposed in front of the core tank. The chuck body is fixed to the front of the lead tank, and a rotor is non-rotatably attached to the lead tank, but is arranged rotatably with respect to the shaft cylinder. In addition, a slider is disposed behind the rotor, a rear end collar formed on the core tank is brought into contact with a rear end surface of the slider, and the core tank is pressed by the knock member , and , Sliding Moved to, the allowed to rotate the rotor by movement of the slider, Shah with a chuck member rotation means for rotating the fixed chuck body to the lead tank by the rotation of its rotor - Pupenshiru.