JP6560119B2 - Core feeding tool - Google Patents

Description

  The present invention relates to a core feeding tool that is used in a state in which a rod-shaped core housed in a shaft tube is fed from the shaft tube and protruded from a tip opening.

  Inside the shaft tube, a mechanical pencil lead, colored pencil, crayon, or a rod-shaped core such as solid glue, lipstick, or lip balm is housed, and the tip of the lead is fed out of the shaft tube to project the lead from the tip opening. A core feeding tool that performs writing or coating on a paper surface or the like in a state in which it is applied is well known.

  The lead feeding tool described above is used by performing a lead feeding operation and operating a lead feeding unit disposed in the shaft cylinder so that the core projects from the tip opening of the shaft cylinder. In addition, since the tip of the lead protruding from the tip opening of the shaft tube by the lead feeding operation is worn by writing or applying, if the writing or applying becomes impossible due to wear, the lead feeding operation is performed again. It is necessary to make it protrude from the front-end | tip opening part of a shaft cylinder. Furthermore, when the lead wears out and becomes less than a certain length, the remaining lead is discharged from the tip opening of the shaft tube, and the tip of the new core in the shaft tube needs to be fed out until it protrudes from the tip opening of the shaft tube. There is. For this reason, as the length of advancement of the lead in one lead-out operation is shorter, the lead-out operation of the lead required to protrude the tip of the lead in the shaft tube from the tip opening of the shaft tube The number of times increased, and it took time and effort.

  In addition, when performing the above-described lead-out operation, it takes time to project the tip of the lead from the tip opening of the shaft tube. If the tip of the lead is protruded too much from the tip opening of the shaft tube, it protrudes. Since the lead is easily broken at a portion, the lead that needs to be kept small in a single lead-out operation is particularly likely to occur with a thin mechanical pencil, and a mechanical pencil that considers the solution is, for example, a patent It is described in Document 1.

In Patent Document 1, when the lead housed in the shaft cylinder is caused to protrude from the shaft cylinder by operating the lead feeding unit, the length by which the lead is advanced by a single lead feeding operation is adjustable. A pencil is described.
In this structure, an adjustment mechanism is provided in which the chuck is clamped by a fastener externally fitted to the chuck so that the lead is clamped and the movable length of the fastener can be adjusted. The length to be changed can be changed, and by increasing the advancement amount of the fastener, it is possible to reduce the number of times that the core is extended until the core protrudes from the tip opening of the shaft cylinder. However, in order to adjust the length of movement of the fastener, a two-step operation of removing the base attached to the tip of the shaft tube and rotating the screw piece is required, which is troublesome. It was.

Japanese Utility Model Publication No. 54-36738

  The present invention has been invented in view of the above-described problems, and is capable of switching between a state in which the lead can be gradually drawn out by a simple operation and a state in which the lead can be drawn out long. The purpose is to provide equipment.

The present invention
“1. A core tank that accommodates a rod-shaped core, a chuck that holds the core, a fastener that is externally fitted to the head of the chuck, and a space between the fastener and the core tank. A lead feeding unit having a chuck spring that is stretched and repels the chuck backward, and advances the lead tank against the resilience of the chuck spring, thereby moving the lead from the tip of the shaft cylinder. A lead feeding tool for feeding, wherein a sliding member formed inside the shaft tube so as to be movable back and forth in a direction along an axis and rotatable in a circumferential direction of the shaft is disposed. An operating portion exposed from the outer surface of the shaft cylinder and operable, and a front portion extending into the core tank, and a slit portion in which the operating portion can slide in the core tank, and the operating portion And a rear end portion that abuts, and the operation portion is moved back and forth on the shaft cylinder. A plurality of vertical hole portions formed so as to be connected to the vertical hole portion so that the operation portion rotates in an axial circumferential direction, and the core tank and the sliding member A rear spring is hung between them to repel the sliding member backward, and the operation portion is rotated in the lateral hole portion so that the operation portion comes into contact with the rear end of the core tank. The lead is extended until the fastener releases the chuck, and the operation portion is rotated in the lateral hole portion so that the operation portion is positioned behind the slit portion of the lead tank. When the lead tank is moved forward in the state, the lead tank is pushed by the rear spring in a state where the elastic force of the rear spring exceeds the elastic force of the chuck spring, and the fastener holds the chuck. Open the sliding member further in that state. In the core feeding device which is characterized in that the core of the core tank in front portion of the sliding member moves forward.
2. The sliding member is formed in a cylindrical shape with an opening at the rear, a first through hole is provided at a position shifted from the axial center of the front portion of the sliding member, and the core is accommodated in the sliding member A cylindrical member is rotatably disposed, a second through hole is provided at a position shifted from the axial center of the front portion of the cylindrical member, and one of the first through hole and the second through hole is a core. Is formed in such a size that only one is inserted, and by rotating the cylindrical member and aligning the positions of the second through hole of the cylindrical member and the first through hole of the sliding member, 2. The lead feeding tool according to claim 1, wherein the lead can be supplied from the cylindrical member into the lead tank. Is.

  In the lead feeding tool of the present invention, the operation portion formed on the sliding member is rotated with respect to the shaft cylinder, the operation portion is brought into contact with the rear end of the lead tank, and the operation portion is advanced in that state. Thus, the lead tank and the chuck are pressed and moved forward, and the lead can be gradually fed out by the chuck. Further, the operating portion is rotated so that the operating portion is positioned behind the slit portion of the lead tank, and the sliding member is moved forward with respect to the lead tank by advancing the operating portion in this state. The sliding member abuts on the rear end of the inner core, and the core is directly pressed by the sliding member, so that the core can be moved forward and protruded from the tip opening of the shaft tube. It should be noted that the length by which the core protrudes from the tip opening of the shaft tube can be freely set within the range in which the sliding member can advance unless the front end of the operating portion of the sliding member contacts the front end of the slit portion of the core tank. It is possible to decide. Therefore, the lead feeding tool of the present invention can switch between a state in which the lead can be gradually drawn out and a state in which the lead can be drawn out long by rotating the operating portion with respect to the shaft tube. it can.

Further, in the present invention, when the sliding member is moved forward in a state where there are a plurality of new cores in the core tank, since only one core enters the chuck, the core remaining in the core tank However, in order to prevent the sliding member from moving forward, it is desirable to place only one lead in the lead tank. Therefore, a cylindrical member is disposed behind the sliding member, and the first through hole formed in the sliding member and the second through hole formed in the cylindrical member are rotated so that one core is formed. It is preferable to supply the core tank one by one so as to prevent a plurality of cores from entering the core tank at the same time.
In addition, when there are a plurality of cores in the core tank, the rear end of the core cannot be directly pressed by the sliding member, but the position where the sliding member can be rotated and the core tank can be pressed by the sliding member. It is possible to advance the lead tank and feed the lead by adjusting to the above.

  In the present invention, a lead feeding tool capable of switching between a state where the lead can be gradually drawn out by a simple operation and a state where the lead can be drawn out long can be obtained.

It is a side view of the mechanical pencil of a present Example. It is an expanded sectional view which shows the AA line cross section of FIG. It is a longitudinal cross-sectional view in the BB line of FIG. FIG. 4 is an enlarged cross-sectional view showing the mechanical pencil of the present embodiment taken along the line AA of FIG. 1, and FIG. FIG. 4B is an enlarged cross-sectional view in which the operating body is rotated to align the operating body with the second vertical hole. It is a longitudinal cross-sectional view in the CC line of FIG. It is a longitudinal cross-sectional view in the DD line of FIG. It is the figure which advanced the sliding body from the state of FIG.

Hereinafter, the mechanical pencil of the present embodiment will be described with reference to the drawings. However, the present invention is not limited to the mechanical pencil, and a colored pencil, crayon, solid paste, lipstick, lip balm or the like is used. It can be used as a lead feeding tool.
In this embodiment, the side with the writing tip is expressed as the front, and the opposite side is expressed as the rear. Moreover, the side close to the axial center of the shaft cylinder is expressed as inward, and the opposite side is expressed as outward.

1 is a side view of the mechanical pencil of the present embodiment, FIG. 2 is a cross-sectional view taken along line AA of the mechanical pencil of FIG. 1, and FIG. 3 is a vertical cross-sectional view taken along line BB in FIG. It is. As shown in FIGS. 1, 2, and 3, the mechanical pencil 1 includes a shaft member 2 that is formed in a cylindrical shape, a tip 3 that is screwed into a front portion of the shaft member 2, and a rear portion of the shaft member 2 And a cap 5 inserted from the rear of the rear cylinder member 4. Further, the tip 3 is formed with a tip opening 3a in which a rod-shaped core 8 is projected and retracted. In the present embodiment, the shaft member 20 is constituted by the shaft member 2, the front port 3, and the rear tube member 4.
Further, a side hole 7 formed by penetrating the inner and outer surfaces of the shaft tube 20 is formed on the side surface of the shaft tube 20. The side hole 7 has a first vertical hole 7a that extends short along the axis, a second vertical hole 7b that extends long along the axis, and the first vertical hole 7a and the second vertical hole 7b. And a lateral hole portion 7c extending in the circumferential direction of the connecting shaft.
Further, a sliding member 8 having an operation portion 8 a protruding outward from the side surface of the shaft tube 20 is disposed inside the shaft tube 20, and the operation portion 8 a extends along the side hole 7. It is formed so that it can move back and forth and turn.

As shown in FIG. 3, inside the shaft cylinder 20, the chuck 9 having a head 9 a divided into two parts, the connector 10 press-fitted and fixed to the rear part of the chuck 9, and the press-fitted and fixed to the rear part of the connector 10. A cylindrical core tank 11 is provided. Further, a fastener 12 is externally fitted to the head 9a of the chuck 9, and a chuck spring 14 is stretched between the connector 13 and the connector 10 for receiving the fastener 12 with a mounting load of 400g, and the chuck 9 is moved backward. It has been bulleted.
The chuck 9, the connector 10, the lead tank 11, the fastener 12, and the chuck spring 14 constitute a lead feeding unit 30 that moves back and forth to feed the lead 6.
The connector 13 is fixed in the shaft tube 20 by sandwiching the flange 13a of the connector 13 between the front end of the shaft member 2 and the first inner step portion 3b of the tip 3 screwed into the shaft member 2. Has been.
Further, a lead holder 15 formed of a synthetic rubber that holds the lead 6 with an appropriate force is built in the tip 3.

  The fastener 12 is externally fitted to the head portion 9a of the chuck 9, and is loosely fitted between the front end of the connector 13 and the second inner step portion 3c on the inner surface of the front end so as to be movable back and forth.

The core tank 11 press-fitted and fixed to the rear portion of the connector 10 is formed in a cylindrical shape, and the inner hole portion 11a is formed with a front portion 11b in a tapered shape and a front step portion 11c. It is.
Further, as shown in FIGS. 1 and 6, a slit portion 11 d formed in the same position and size as the second vertical hole portion 7 b of the side hole 7 of the shaft cylinder 20 is formed on the side surface of the core tank 11. In addition, one hole that penetrates from the outer surface of the shaft tube 20 to the inner surface of the core tank 11 is formed by matching the positions of the second vertical hole portion 7b and the slit portion 11d in the axial circumferential direction.

As shown in FIG. 3, the sliding member 8 has a sliding portion 8 c extending from the base portion 8 b disposed inside the shaft tube toward the outside of the shaft tube 20, and an end portion on the outside of the shaft tube. A semicircular operation portion 8a is formed.
Moreover, the cylindrical front part 8d extended toward the front from the base part 8b is formed, and the 1st through-hole which can insert only one core 6 in the position shifted from the axial center in the front end 8e of the front part 8d 8f is formed.
Further, a spring receiver 8g is formed at the front portion of the base portion 8b. A rear spring 16 is hung between the front step portion 11c of the core tank 11 and the spring receiver 8g of the sliding member 8 with a mounting load of 50g. is there.

  As shown in FIG. 3, a rear cylindrical member 4 is inserted into the rear portion of the shaft member 2. As described above, the rear cylindrical member 4 has a side hole 7 penetrating to the inner surface on the side surface. Further, a locking hole 4a penetrating to the inner surface is formed on the outer peripheral surface of the rear cylinder member 4 in the same manner as the side hole 7, and the locking projection 2a formed on the shaft member 2 is fitted into the locking hole 4a. By doing so, the rear cylinder member 4 is not rotated or detached with respect to the shaft member 2. Further, a recess 4b is formed along the inner peripheral surface of the rear inner peripheral surface of the rear cylindrical member 4.

Further, a tubular member 17 formed in a pipe shape is disposed at the rear opening of the sliding member 8 so that the rear portion of the tubular member 17 protrudes rearward from the rear end of the shaft tube 20. The convex portion 17a formed along the outer peripheral surface of the rear portion of the member 17 is loosely fitted into the concave portion 4b of the rear cylindrical member 4 to prevent the cylindrical member 17 from coming off from the shaft tube 20 and the cylindrical member 17 is connected to the shaft tube 20. And it is comprised so that rotation with respect to the sliding member 8 is possible.
Further, a second through hole 17 c into which only one core 6 can be inserted is formed at a position shifted from the axial center at the front end 17 b of the cylindrical member 17, and the cylindrical member 17 is attached to the sliding member 8. When rotating, the second through hole 17c of the cylindrical member 17 and the first through hole 8f of the sliding member 8 are combined to form an insertion hole through which only one core 6 can be inserted. The distances from the axial center of the two through holes 17c are aligned.

  As shown in FIG. 3, a cap 5 is fitted to the rear portion of the cylindrical member 17, and the cylindrical member 17 is a shaft cylinder that has resistance when the cap 5 is rotated with respect to the cylindrical member 17. When the cap 5 is gripped and rotated, the cylindrical member 17 is driven and rotated by setting it to be larger than the resistance force generated when rotating with respect to 20 and the sliding member 8.

Next, with reference to FIGS. 2, 4, and 5, an operation of extending the lead by pushing the operation portion 8 a of the mechanical pencil 1 short forward will be described.
The mechanical pencil 1 of the present invention rotates the operation portion 8a from the state in which the operation portion 8a of FIG. 2 is in the lateral hole portion 7c of the side hole 7, and the operation portion 8a is first moved as shown in FIG. When matched with the vertical hole 7a, the state shown in FIG. The cylindrical member 17 in FIG. 5 is in a state rotated 180 degrees from the state of FIG. 3, and the replenishment core 18 is inserted into the cylindrical member 17.
When the operation portion 8a is knocked forward against the elastic force of the chuck spring 14 in the state shown in FIG. 5, the rear end portion 11e of the lead tank 11 is pressed against the sliding portion 8c, and the lead tank 11 and the connector are connected. −10, the chuck 9 moves forward while compressing the chuck spring 14. At this time, since the fastener 12 is externally fitted to the chuck 9, the core 6 also advances together. However, when the fastener 12 comes into contact with the rear end of the second inner step portion 3c of the tip 3, The fastener 12 is separated from the head portion 9a of the chuck 9, the lead 6 is released, and the advance of the lead 6 stops. When the front end of the sliding portion 8c of the sliding member 8 further advanced contacts the front end of the first vertical hole portion 7a, the forward movement of the sliding member 8, the core tank 11, the connector 10, and the chuck 9 is restricted.

Here, when the knocking operation on the operation portion 8a is canceled, the lead tank 11, the connector 10 and the chuck 9 are moved backward by the elastic force of the chuck spring 14, and the fastener 12 is externally fitted to the chuck 9 again. The lead 6 is sandwiched and the lead 6 can be fed out in the same manner as a general mechanical pencil.
In this knocking operation, the length by which the lead 6 is drawn out by one operation is set to about 0.5 mm. Therefore, by repeating the knocking operation a plurality of times, the lead 6 drawn out forward by the chuck 9 becomes the leading end. It protrudes from the front-end | tip opening part 3a of 3, and will be in the state which can be written.

Next, when the core 6 is used up using the jarp pencil 1 in the state shown in FIG. 5, the operating portion 8a of the sliding member 8 is pushed forward long by using FIGS. Thus, the operation of causing the replenishment lead 18 placed in the lead tank 11 to protrude from the tip opening 3a of the tip 3 by a single knocking operation will be described.
The mechanical pencil 1 of the present invention is operated as shown in FIG. 4B by rotating the operation portion 8a from the state where the operation portion 8a shown in FIG. 5 is aligned with the first vertical hole portion 7a of the side hole 7. When the portion 8a is aligned with the position of the second vertical hole portion 7b, the sliding portion 8c of the sliding member 8, the second vertical hole portion 7b of the shaft cylinder 20, and the slit portion 11d of the core tank 11 follow the axial center. Will be in agreement. Here, when the cap 5 is rotated 180 degrees with respect to the shaft cylinder 20, the second through hole 17 c of the cylindrical member 17 and the first through hole 8 f of the sliding member 8 are aligned so that the core 18 can pass through. The replenishment lead 18 is supplied into the lead tank 11, and the replenishment lead 18 is guided to the inside of the chuck 9 by the tapered portion 11b formed in the front portion 3b of the lead tank 11, and the state shown in FIG.
In this state, when the operation portion 8 a is pushed forward against the elastic force of the rear spring 16, the sliding member 11 moves forward while compressing the rear spring 16. Thereafter, when the elastic force of the rear spring exceeds 400 g which is the attachment load of the chuck spring 14, the lead tank 16 is pushed forward by the rear spring 16, and the chuck 9 and the connector 10 are driven by the lead tank 11. Advance. At this time, since the fastener 12 is fitted on the chuck 9, the fastener 12 also moves forward together. However, when the fastener 12 comes into contact with the rear end of the second inner step portion 3 c of the front end 3. The head 9a of the chuck 9 is separated from the fastener 12, the head 9a is opened, and the two-divided head 9a is expanded.
When the sliding member 8 is further advanced, the front end 8e of the sliding member 8 comes into contact with the rear end 18a of the replenishing core 18, the replenishing core 18 is pressed forward, and the chuck 9 is expanded. 18 passes through the chuck 9 and protrudes from the tip opening 3a of the tip 3 to be in the state of FIG.
Here, when the forward movement of the operation portion 8a is stopped, the sliding member 8, the chuck 9, the connector 10, and the core tank 11 are moved backward by the elastic force of the chuck spring 14 and the rear spring 16, and again. The fastener 12 is externally fitted to the chuck 9 and the replenishment core 18 is sandwiched.

When the core 6 is fed out with the operation portion 8a aligned with the second vertical hole portion 7b, the length of the core 6 protruding forward from the tip opening 3a of the tip 3 is the sliding portion 8c of the sliding member 8. As long as the front end of the sliding member 8 does not come into contact with the front end of the second vertical hole portion 7b of the shaft cylinder 20, the sliding member 8 can be freely determined within a possible range.
Even if there is a shortened remaining core inside the chuck 9, the tip opening 3 a of the tip 3 or the core holder 15, the remaining core is pressed forward by the refill core 18 in the core tank 11, Since it can be forcibly discharged from the tip opening 3a of the mouth 3, the lead can be protruded from the tip opening 3a by a single feeding operation without being affected by the remaining core.
Furthermore, in this embodiment, the sliding member 8 and the lead tank 11 cannot be moved forward by aligning the operation part 8a of the sliding member 8 with the position of the lateral hole 7c of the side hole 7 when carrying, so Inadvertent feeding from the tip opening 3a of the tip 3 can be prevented.

  Therefore, the mechanical pencil 1 that can switch between a state in which the lead can be gradually drawn out and a state in which the lead can be drawn out long is obtained by rotating the operation unit 8a in the axial direction. It was.

1 ... mechanical pencil,
2 ... shaft member, 2a ... locking projection,
3 ... tip opening, 3a ... tip opening, 3b ... first inner step, 3d ... third inner step,
4 ... rear cylinder member, 4a ... locking hole, 4b ... recess,
5 ... Cap,
6 ... Core,
7 ... side hole, 7a ... first vertical hole, 7b ... second vertical hole, 7c ... horizontal hole,
8 ... sliding member, 8a ... operation part, 8b ... base part, 8c ... sliding part, 8d ... front part,
8e ... front end, 8f ... first through hole, 8g ... spring support,
9 ... chuck, 9a ... head,
10 ... Connector,
DESCRIPTION OF SYMBOLS 11 ... Core tank, 11a ... Inner hole part, 11b ... Front part, 11c ... Front part,
11d ... slit part, 11e ... rear end part,
12 ... Fasteners,
13 ... connector, 13a ... front end,
14 ... Chuck spring,
15 ... Core holder,
16: Rear spring,
17 ... cylindrical member, 17a ... convex part, 17b ... front end, 17c ... second through hole,
18 ... replenishment core, 18a ... rear end,
20 ... shaft tube,
30 ... Core feeding unit.

Claims (2)

1. A shaft tank that accommodates a rod-shaped core, a chuck that sandwiches the core, a fastener that is externally fitted to the head of the chuck, and a tensioner that is stretched between the fastener and the core tank. A lead feeding unit having a chuck spring for resiliently pushing the chuck backward, and a lead feeding unit for feeding the lead from the tip of the shaft cylinder by advancing the lead tank against the resilient force of the chuck spring; A sliding member formed inside the shaft tube so as to be movable back and forth in the direction along the axis and rotatable in the axial circumferential direction; An operation portion that is exposed from the outer surface of the shaft tube and can be operated, and a front portion that extends into the core tank are provided, and a slit portion that allows the operation portion to slide and the operation portion abut on the core tank. A rear end, and the operation unit moves back and forth on the shaft tube. A plurality of formed vertical hole portions, and a horizontal hole portion formed so as to be connected to the vertical hole portion so that the operation portion rotates in the axial circumferential direction, are provided between the core tank and the sliding member. A rear spring is hung to repel the sliding member rearward, and the operation portion is rotated in the lateral hole portion to bring the operation portion into contact with the rear end of the lead tank, and the lead tank is advanced. By doing so, the lead is extended until the fastener releases the chuck, and the operation portion is rotated in the lateral hole portion so that the operation portion is positioned behind the slit portion of the lead tank. When the lead tank is advanced, the lead tank is pushed by the rear spring in a state where the elastic force of the rear spring exceeds the elastic force of the chuck spring, and the fastener releases the chuck. By further advancing the sliding member in that state, Core feeding device which is characterized in that the core of the core tank in front of the serial sliding member moves forward. The sliding member is formed in a cylindrical shape with an opening at the rear, a first through hole is provided at a position shifted from the axial center of the front portion of the sliding member, and the core is accommodated in the sliding member A cylindrical member is rotatably disposed, a second through hole is provided at a position shifted from the axial center of the front portion of the cylindrical member, and one of the first through hole and the second through hole is a core. Is formed in such a size that only one is inserted, and by rotating the cylindrical member and aligning the positions of the second through hole of the cylindrical member and the first through hole of the sliding member, 2. The lead feeding tool according to claim 1, wherein the lead can be supplied from the cylindrical member into the lead tank.

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