JPH081910Y2 - Writing instrument - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a rod-shaped object is extended from a rear end of a tubular body by rotating a tubular cap, and a writing medium is extended from a tip tool by knocking the tubular body. .

[0002]

2. Description of the Related Art In a conventional writing instrument, a knock cap is removed from a rod-shaped object holder fitted into a core tank of a writing shaft, and a rod-shaped material such as an eraser is used. When a rod-shaped object is not used, it is attached to the rod-shaped object holder. By knocking the knock cap, the writing medium can be fed out from the leading tool.

[0003]

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, since the rod-like object cannot be paid out,
Whenever the number of rods decreases, the rod holder is removed from the rod holder each time, the holder is opened, the rods are pulled out by the reduced amount, the holder is closed, and the rods are fitted into the rod holder. Work had to be repeated.

[0004]

In order to solve the above-mentioned problems, the writing instrument of the present invention has a writing shaft body housed in an outer cylinder, and spiral grooves are formed on the inner surface of the rear portion and the inner surface of the front portion of the cylindrical cap, respectively. And a stepped portion, the protruding piece provided by cutting on the outer surface of the tubular body is locked to the stepped portion, a slit is provided in the rear part of the tubular body, and the rod-shaped object support is slidable in this slit , The projection of the rod-shaped object support is fitted in the spiral groove, the front part of the tubular body is extended to the inner surface of the rear part of the outer cylinder, and it is axially movable with respect to the outer cylinder and locked in the rotation direction. The configuration is

[0005]

With this structure, when the tubular cap is rotated, the front portion of the tubular body is axially movable with respect to the outer cylinder and is locked in the rotational direction.
Since the rod-shaped object support is slidably fitted in the slit in the rear part of the cylindrical body, the rod-shaped object support moves in the axial direction while being guided along the slit of the cylindrical body, The rod-shaped object provided in the can be retracted from the cylindrical body depending on the rotation direction.

When the rear end of the tubular body is knocked, the axially movable tubular body moves forward with respect to the outer barrel, and the writing medium can be fed out from the outer barrel similarly to a known writing instrument. When assembling this writing instrument, if you insert the cylindrical body from the rear end of the cylindrical cap and push it in, the protruding piece bends inward and oversteps the step of the cylindrical cap. Lock on the step. Once the protruding piece is locked to the step, the locking does not easily come off. In this way, the tubular body can be securely and easily attached to the tubular cap.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a writing instrument of the present invention, FIG. 2 is a partially exploded perspective view of a main part, and FIG. It is a perspective view which shows the state which fitted the eraser receiving stand which is a rod-shaped thing receiving stand.

In the figure, reference numeral 2 is a writing shaft body housed in an outer cylinder 3 having a tip 1. This writing shaft 2 is a chuck 2
1, spring 20, chuck ring 23, cushion part 24
It comprises a sleeve 24 having a and a lead tank 8 connected to the chuck 21. The writing shaft 2 is housed in the outer cylinder 3 by locking the sleeve 24 to the former 1 and screwing the former 1 to the distal end of the outer cylinder 3.

A tubular cap 19 has a step portion 4 on the inner surface of the front portion of the tubular cap 19 and a spiral groove 5 on the inner surface of the rear portion of the tubular cap 19.
6 is a cylindrical body inserted from the rear end of the cylindrical cap 19,
A protruding piece 15 formed by cutting a substantially central portion of the outer surface of the cylindrical body 6 is engaged with the step 4 of the cylindrical cap 19. Similarly, in the front portion 6a of the tubular body 6, a receiving portion, for example, a receiving plate 9 that abuts the core tank 8 of the writing shaft body 2 is provided.

In the present embodiment, an octagonal polygonal portion 17 is formed on the inner surface of the rear portion of the outer cylinder 3, and the polygonal portion 17 is inserted into the outer periphery of the front portion 6a of the tubular body 6. Polygon part 1
8 are formed. Therefore, the front portion 6a of the tubular body 6 is axially movable with respect to the rear portion of the outer cylinder 3 and is locked in the rotational direction. The means by which the front portion 6a of the tubular body 6 is axially movable with respect to the rear portion of the outer cylinder 3 and locked in the rotational direction is limited to the means by the polygonal portions 17 and 18 of this embodiment. It is not limited to this and may be a means using a key groove and a key, for example.

Slits 10 are provided in the opposite portions of the rear portion 6b of the tubular body 6, and two sandwiching pieces 12 of an eraser receiving base 11 inserted from the slits 10 are directed to the rear sides of both slits 10. It is slidably fitted in. An eraser 13 is sandwiched between the two sandwiching pieces 12, and a projection 14 provided on each sandwiching piece 12 is fitted into the spiral groove 5 of the tubular cap 19. 25, 26
Is an eraser cradle 11 formed before and after the slit 10.
Of the annular stopper. Therefore, the eraser pedestal 11 is moved in the axial direction until it comes into contact with the annular stopper portions 25 and 26 at the front and rear of the slit 10.

A method of assembling the writing instrument according to the present embodiment in the above configuration will be described. First, the slit 10 of the cylindrical body 6
Of both sides of the cylindrical body 6 so that both the holding pieces 12 thereof face rearward from the slit 10 through the slit 10.
And the two holding pieces 12 are slidably fitted into both slits 10. Next, the rubber eraser 13 is inserted from the rear end of the cylindrical body 6 and is sandwiched by both holding pieces 12.
5 deflects inward and rides over the step 4 of the cylindrical cap 19, and is locked to the step 4 when it crosses the step 4. Once the protruding piece 15 is locked to the step portion 4, the locking cannot be easily released. Thus, the attachment of the tubular body 6 to the tubular cap 19 can be performed reliably and easily.

The holding of the eraser 13 between the holding pieces 12 may be performed after the cylindrical body 6 is assembled to the cylindrical cap 19. When the attachment of the tubular body 6 to the tubular cap 19 is completed, the annular stopper portion 26 of the tubular body 6 comes into contact with the rear end of the tubular cap 19. It goes without saying that the component dimensions are determined so as to achieve such a state. Next, holding the cylindrical cap 19, the front portion 6a of the cylindrical body 6 is held.
Is inserted into the polygonal portion 17 provided on the inner surface of the rear part of the outer cylinder 3 to complete the assembly of the writing implement. In this case, it is needless to say that the cylindrical body 6 is strongly inserted so that the cylindrical body 6 does not come off from the rear of the outer cylinder 3.

Next, the operation will be described. When the eraser 13 is not used, as shown in FIG. 1, the eraser receiver 11 is in contact with the annular stopper 25 at the front of the cylindrical body 6.
Is in a state in which it just coincides with the end face of the annular stopper portion 26 at the rear of the cylindrical body 6. When the cylindrical cap 19 is rotated in this state, the front part 6a of the cylindrical body 6 is axially movable with respect to the rear part of the outer cylinder 3 and is locked in the rotation direction. Spiral groove 5
A projection 14 provided on the holding piece 12 of the eraser receiver 11
Are fitted, so that the eraser cradle 11 moves in the axial direction while being guided along both slits 10 of the tubular body 6 into which the two holding pieces 12 are fitted, and
The eraser 13 sandwiched between the two sandwiching pieces 12 can be retracted from the tubular body 6 depending on the rotation direction.

When the rear end of the tubular body 6 is knocked, the core tank 8 which is in contact with the receiving plate 9 of the tubular body 6 together with the tubular cap 19 moves forward against the spring 20 or by its spring force. Alternatively, the lead 22 can be moved backward and the lead 22 can be extended from the tip 1 by opening and closing the chuck 21 as in a known mechanical pencil. The eraser 13 can be fed out by rotating the tubular cap 19 by the decrease amount and moving the eraser receiving base 11 in the axial direction, to the right in the illustrated example. After use, the tubular cap 19 is reversed. By rotating and moving the eraser cradle 11 to the left, the eraser 13
Can be withdrawn.

[0016]

According to the present invention, as described above, the rod-shaped object receiving base can be moved in the axial direction by rotating the cylindrical cap with respect to the outer cylinder, and the rod-shaped object can be moved in accordance with the rotation direction. , Can be protruded and retracted from the cylindrical body, so that it can be used by feeding out the required amount of the rod when using the rod, and when not in use, the rod can be retracted. The rod-shaped object can be easily moved in and out only by using the above. Therefore, it is not necessary to repeatedly perform a troublesome operation as in the related art.

Further, by locking the protruding piece provided on the outer surface of the tubular body by the step portion, the tubular body can be reliably and easily attached to the tubular cap during assembly. As described above, the number of parts is small for the convenience, and it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a writing instrument of the present invention.

FIG. 2 is a partially exploded perspective view of a main part of FIG.

FIG. 3 is a perspective view showing a state in which an eraser cradle is fitted in the slit of the tubular body in the present invention.

[Explanation of symbols]

 2 Writing Shaft 3 Outer Cylinder 4 Step 5 Spiral Groove 6 Cylindrical 6a Cylinder's Front Part 6b Cylinder's Rear Part 10 Slit 11 Eraser Cage 14 (Protrusion 15 Cushion) 19 Cylinder Cap

Claims (1)

[Scope of utility model registration request] 1. A writing shaft body is housed in an outer cylinder, a spiral groove and a step portion are provided on a rear inner surface and a front inner surface of a cylindrical cap, respectively, and a projection provided by cutting on the outer surface of the cylindrical body. Locking the piece to the stepped portion, providing a slit in the rear portion of the tubular body, slidably fitting the rod-shaped object support into this slit, and fitting the projection of the rod-shaped object support into the spiral groove, A writing instrument having a structure in which a front portion of a tubular body is extended to an inner surface of a rear portion of an outer cylinder, axially movable with respect to the outer cylinder, and locked in a rotation direction.