JP2577727Y2 - mechanical pencil - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil provided with a device for sequentially feeding out a rod-shaped body such as an eraser, a crayon, a glue, or a bar-shaped cosmetic behind a shaft. is there. 2. Description of the Related Art Japanese Utility Model Laid-Open No. 57-132598 is known as an example of a rod-shaped body feeding device. More specifically, the main body (outer shaft) having a thread groove (spiral groove) formed on the inner surface
In the main body, an eraser receiver (bar-shaped member receiving member) having a grip portion for gripping and fixing the rod-shaped body is arranged. In addition, a core tube (rod-shaped) formed with a notch (guide groove) cut out to the final end in order to dispose the eraser receiving protrusion (projection) formed on the eraser receiver in a slidable manner in the main body. Body guide member). When erasing is performed by projecting an eraser, the erasing pressure is concentrated on the sheet and the cut. In the above prior art, when such an erasing pressure is applied, since the cut is formed up to the top (final end) of the core tube, the eraser may enter the upper portion of the cut, or the upper portion of the core tube may be cut. Was deformed, causing the eraser to run out, making it difficult to erase. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a lead core feeding mechanism and a core tank disposed behind the lead core feeding mechanism. In a mechanical pencil, which is provided with a rod-shaped body feeding device for feeding a rod-shaped body by a spiral mechanism behind the shaft cylinder, the rod-shaped body feeding device includes an outer shaft having a spiral groove formed integrally on an inner surface thereof. A rod-shaped body receiving member having a grip portion for gripping and fixing the rod-shaped body in the outer shaft; and a rod-shaped body guide member formed with a guide groove for slidably disposing a protrusion formed on the rod-shaped body receiving member. And connecting the final end of the guide groove of the rod-shaped body guiding member, forming the inner diameter of the rod-shaped body guiding member and the outer diameter of the rod-shaped body to be substantially the same diameter, and By fitting the front part into the core tank Thus, the shaft cylinder and the rod-shaped body feeding device are connected ,
Also, the rod-shaped body guide member has an outwardly projecting rear end and an intermediate portion.
Parts, and the outer shaft is
The It is an Abstract that you were clamped rotatably relative to the rod-like body guide member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. Note that the lower part in the figure is the front, and the upper part is the rear. FIG. 1 shows an example in which the present invention is applied to a mechanical pencil. A front member 3 having a well-known center detent member 2 is screwed in front of the barrel 1. A lead tank 5 having a chuck 4 connected to the tip thereof is provided in the middle of the barrel 1, and a knock spring S is interposed between the lead tank 5 and the barrel 1. A chuck ring 6 for opening and closing the chuck 4 is slidably fitted in front of the chuck 4. A rod-shaped guide member 10 having a guide groove 9 to which a rear end is connected in the longitudinal direction is inserted behind the shaft cylinder 1 in a non-rotatable manner (see FIG. 2) and slidably. I have. In addition, the rod-shaped body guiding member 10 is
Also extrapolated. Then the rod-like body guide member 10 has a rear end flange portion 10a for stabilizing the rod-like body feeding device and the press-fit member 12 (these press-fitting the rear flange portion
The member is an example of the outwardly protruding portion in this example.
You. The helical member (outer shaft) 7 having the helical groove 8 and the stepped portion 7a is sandwiched between the flange 10a and the press-fitting member 12, so that the helical member 7 is rotatable with respect to the rod-shaped body guiding member 10. Placed in A rod-shaped body having a grip 13a and a projection 13b for holding an eraser 11 having an outer diameter substantially the same as the inner diameter of the rod-shaped body guide 10 inside the rod-shaped body guide 10 is provided. The receiving member 13 is inserted. The projection 13 b of the rod-shaped body receiving member 13 projects from the guide groove 9 of the rod-shaped body guide member 10 and engages with the spiral groove 8 of the spiral member 7. Next, the operation will be described. The barrel 1 is gripped and fixed by hand or the like, and the spiral member 7 is rotated. With the rotation of the spiral member 7, the rod-shaped body receiving member 13 rises while sliding in the guide groove 9. The eraser 11 protrudes from the rear end of the outer shaft 7 due to the rise of the rod-shaped receiving member 13. At this time, the rotational force of the eraser receiving member 13 is applied to the guide groove 9, but since the rear end of the guide groove 9 is connected by the flange 10a, the width of the guide groove 9 does not change. In addition, even the eraser that has become short can be smoothly fed out without being caught on the inner wall surface of the rod-shaped body guide member.
In the case of writing, when the spiral member 7 or the rear end of the extended eraser 11 is pressed, a writing body L such as a lead becomes
By the pressing operation, the tip member 3 protrudes from the front end. According to the present invention, there is provided a shaft cylinder in which a lead core feeding mechanism and a core tank are arranged behind the lead core feeding mechanism, and a rod-shaped member is provided behind the shaft cylinder by a spiral mechanism. In a mechanical pencil to which a rod-shaped body feeding device for feeding a body is attached, the rod-shaped body feeding device has an outer shaft having a spiral groove integrally formed on an inner surface, and a grip portion for holding and fixing the rod-shaped body in the outer shaft. A rod-shaped body receiving member, and a rod-shaped body guiding member having a guide groove for slidably disposing a projection formed on the rod-shaped body receiving member, and a final end of the guide groove of the rod-shaped body guiding member. Parts, the inner diameter of the rod-shaped body guiding member and the outer diameter of the rod-shaped body are formed to be substantially the same diameter, and the front part of the rod-shaped body guiding member is fitted into the core tank, whereby the shaft cylinder and the rod-shaped body are connected. body feed ligated to a device, or
An outwardly projecting portion is provided at a rear end and an intermediate portion of the rod-shaped body guiding member.
And the outer shaft is formed by their outward projections.
The present invention provides an inexpensive mechanical pencil that has a small number of parts, because the eraser does not run out at the time of erasing because it is rotatably clamped with respect to the rod-shaped body guiding member, it can be smoothly erased without discomfort, and it can be extended. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted longitudinal sectional view showing an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA of FIG. [Description of Signs] 1 Shaft cylinder 2 Core detent member 3 Tip member 4 Chuck 5 Core tank 6 Chuck ring 7 Spiral member (outer shaft) 7a Step 8 Spiral groove 9 Guide groove 10 Rod guide member 10a Rear end flange 11 rod-shaped body (eraser) 12 press-fitting member 13 rod-shaped body receiving member 13a gripping part 13b projecting part

Claims (1)

(57) [Rules for requesting registration of utility model] A mechanical pencil in which a lead core feeding mechanism and a core tank are arranged behind the lead core feeding mechanism, and a rod-shaped body feeding device for feeding a rod-shaped body by a helical mechanism behind the shaft cylinder is attached. In the rod-shaped body feeding device, an outer shaft having a spiral groove integrally formed on an inner surface thereof, a rod-shaped body receiving member having a gripper for gripping and fixing the rod-shaped body in the outer shaft, and a rod-shaped body receiving member. And a rod-shaped guide member having a guide groove for slidably arranging the formed protrusion, and connecting the final end of the guide groove of the rod-shaped guide member to an inner diameter of the rod-shaped body guide member. the outer diameter of the rod-like body substantially formed in the same diameter as, also, by fitting the front portion of the rod-like body guide member to the lead tank, ligated and barrel and the rod-shaped body feeding device, also, the bar Body guidance
At the rear end and middle part of the lumber,
The outer shaft with respect to the rod-shaped body guiding member by the outwardly projecting portion of
Mechanical pencil which is characterized freely and this was sandwiched rotation Te.