JPH048000Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a double type in which a plurality of writing elements are housed in one shaft case (shaft cylinder), and at least one of them is a notch type sharp pencil element. It is related to writing instruments.

(Prior art) A knock-type sharp pencil element and a ballpoint pen element are housed in one shaft case, and a slider is connected to the rear end of the sharp pencil element and the ballpoint pen element to slide in the axial direction within the cylinder. Wear it freely. It can be rotated by a certain angle around these cylinders, and furthermore, it engages with the sliders of both writing elements to alternately move the writing elements forward and backward in the axial direction as they rotate, so that they alternately protrude to the writing position. Writing implements are known that include a cylindrical cam with a cam sliding surface that allows the writing instrument to move.

Then, the pencil element at the writing position is moved in the axial direction to provide a knocking action, thereby feeding out the lead lead.

As described above, methods for moving the writing element back and forth between the writing position and the storage position by reciprocating rotation of the cylindrical cam and applying a knocking action to the sharp pencil element can be roughly divided into two.

One is that the slider of the sharp pencil element slides on the cam slide surface to the tip of the cam slide surface, and when engaged at the tip, moves the cylindrical cam itself in the axial direction to provide a knocking action. , which performs a core feeding operation (for example, Japanese Utility Model Application Publication No. 136379/1983).

The other method uses a cylindrical cam to project the writing element to the writing position, but does not provide the knocking action by moving the cylindrical cam itself, but uses another knocking member to provide the knocking action. That is, when the slider of the sharp pencil element slides to the tip of the cam slide surface and engages with the tip to be in the writing position, the other knob member that engages with the slider is moved in the axial direction to perform centering. (For example, Utility Model Publication No. 56-29173,
and Utility Model Publication No. 57-123088).

(Problem to be solved by the invention) When using a cylindrical cam as in the past, it has the advantage that the writing element can be smoothly moved forward and backward into the writing position by rotation of the cylindrical cam. The following problems occurred during operation.

That is, when the cylindrical cam itself is reciprocated in the axial direction to perform the knocking operation, a strong pressing force is required and the knocking operation becomes heavy. In addition, due to restrictions on the outside diameter, the wall thickness of the cylindrical cam can only be made thin, and since the tip of the cam surface is at an acute angle, the sliding protrusion of the slider comes off the cam surface when the knob is operated, causing the cylindrical cam to become thin. There were cases where it got inside and became impossible to open.

Further, even when the writing element is moved back and forth to the writing position only by the rotation of the cylindrical cam, and the knock operation is performed by another knob member, the knob member is moved integrally with the movement of the cap in the axial direction. In some cases, the cap is not moved, but the knock cap is moved in the axial direction, thereby moving the knock member for centering.

In the former case, in which the knob member moves integrally with the cap, the knob member is inserted into a slot for the knob member drilled on the outer surface of the cam, and the tip of the knob member presses the protrusion of the slider. As the thickness becomes even thinner, it becomes difficult to operate the knob smoothly. Furthermore, in the latter case of pressing the notch cap, not only does the number of parts increase, but also the writing position cannot be moved smoothly.

Furthermore, in any case, when the sliding protrusion of the slider is pressed to perform the knocking operation, a pressing force is applied to the side surface of the shaft of the pencil element, making it even more difficult to maintain the engaged state reliably.

This idea was made in view of the current situation, and allows the alternating movement of the writing element between the writing position and the storage position and the feeding out of the lead of the sharp pencil element to be carried out smoothly and reliably, while simplifying the overall configuration. By doing so, we aim to reduce parts costs, assembly costs, etc., and provide this type of inexpensive dual-action writing instrument.

(Means for solving problems) Therefore, this idea was structured as follows.

That is, a plurality of writing elements, at least one of which is a lock type mechanical pencil element, are inserted into a guide groove of a cylinder connected to a shaft case, a slider is connected to the rear end of the writing element, and a slider is connected to the rear end of the writing element. The cylindrical cam is rotatably attached to the outside of the cylinder and engages with the slider of the writing element to alternately advance and retreat each writing element to the writing position by sliding with the cam surface on the lower end surface. In the double writing instrument, a notch member insertion hole is bored in the side surface of the rotatable cylindrical cam, the tip of the notch member that moves in the axial direction together with the cap is inserted into this notch insertion hole, and the inserted notch is inserted. The tip of the member is brought into contact with a slider at the rear end of the sharp pencil element, and the reciprocating movement of the knock member is transmitted as a knock operation to the sharp pencil element via the slider, thereby performing centering. .

(Example) Hereinafter, this invention will be described in detail based on an illustrative example.

Fig. 1 is a sectional view of the writing instrument of this invention, showing the sharp pencil element in the writing position and the ballpoint pen element in the storage position, Fig. 2 is a perspective view of the cylinder containing the writing element, and Fig. 3. is the second
Partial cross-sectional view of the main parts in the figure, Figures 4 and 5
The figures are a perspective view and a sectional view of the cylindrical cam, FIG. 6 is a perspective view of the knob member, FIG. 7 is a perspective view of the sliding tube, and FIG.
FIG. 9 and FIG. 9 are partially sectional main part front views showing the relationship between the writing element and the knob member.

In the figure, 1 is a shaft case, 2 is a writing element, 3 is a slider, 4 is a cylinder, 5 is a cylindrical cam, 6
7 is a knob member, 7 is a knob cylinder, and 8 is a cap.

The shaft case 1 has a tapered tip and an opening 10 at the tip, and a writing element 2 is housed in the shaft case 1 with its writing tip facing the tip opening 10. The writing element 2 consists of a sharp pencil element 20 and a ballpoint pen element 21, with the sharpening pencil element 20 being stored in the writing position and the ballpoint pen element 21 being stored in the storage position. The pencil element 20 incorporates a lead extrusion mechanism 22, such as a chuck or a clamp, which causes the lead to protrude when pressed. Since this lead feeding mechanism 22 has a well-known structure and function, a description thereof will be omitted.

The rear end of the writing element is connected to a slider 3 which is slidably fitted in the cylinder 4 only in the axial direction.

A cylinder 4 is screwed into the rear opening of the shaft case 1. To replenish the sharp pencil element 20 with lead or replace the ballpoint pen element, remove the shaft case 1 from the cylinder 4, and then remove the tip of the sharp pencil element from the connecting pipe 23 and divide it to replenish the lead. Alternatively, the ballpoint pen element may be removed from the connecting pipe 24 and replaced.

The slider 3 includes a slider 30 connected to the sharp pencil element 20 and a slider 30a connected to the ballpoint pen element 21.

To explain the slider 30, as shown in FIG. 2, a substantially trapezoidal sliding protrusion 31 and a writing element 2
It has a fitting part 32 that connects to the rear end of 0. The sliding protrusion 31 is formed with an inclined surface 33 on the side surface, has a notch 34 at the tip, and has a cylindrical cam 5 as described later.
The writing element slides on the cam slide surface of the writing element to advance and retreat between the writing position and the storage position.

The fitting part 32 of the slider 30 is inserted into and connected to the rear end of the writing element 20, and a coil spring 35 is attached to the rear end of the writing element 20 to always bias the slider 30 in the axial direction of the cylinder 4. has been done.

The structure of the slider 30a is the same as that of the slider 30, but the sliding protrusion 31a is formed larger than the sliding protrusion 31 of the slider 30. Therefore, as will be described later, when the shaft case 1 is moved forward in the distal direction by rotation of the cylindrical cam 5, the slider 30 is inserted into the writing element insertion hole of the cylinder 4, but the slider 30a is cylinder 4
It is configured to be latched to the upper end of the body. The other configuration of the slider 30a is the same as the slider 30.

As shown in FIG. 2, the cylinder 4 has a cylindrical shape made of synthetic resin, and has a cylindrical body screw 41 screwed into the shaft case 1 at the lower end of the body part 40.
A cam insertion part 42 inserted into the cylindrical cam 5 is provided at the upper end, and a shaft head 43 is further provided on the upper surface of the cam insertion part 42.
It is made by protruding. The cam insertion part 42 has a smaller diameter than the body part 40, and has a step part 44 formed between it and the body part 40, and guide grooves 45, 45a that guide the sliders 30, 30a in the axial direction are diametrically spaced apart by 180 degrees. They are perforated opposite each other. The guide grooves 45 , 45 a communicate with writing element insertion holes 46 , 46 a provided in the body portion 40 , and the writing element insertion holes 46 , 46 a open into the threaded portion 41 .

Coil spring receiving parts 47, 47a are provided in the writing element insertion holes 46, 46a of the body part 40,
Coil springs 35, 3 attached to the rear end of the writing element
The lower end of 5a is supported. Coil spring 35, 35
The upper ends of a contact the lower surfaces of the sliders 30, 30a, and the lower ends are supported by the receiving parts 47, 47a, so the sliders 30, 30a
5, 45a and is always biased in the direction of the shaft head of the cylinder 4.

As shown in FIG. 3, since the sliding protrusion 31 of the slider 30 is formed to a size that allows it to be inserted into the writing element insertion hole 46, it is inserted into the writing element insertion hole 46 by the knocking operation of the knocking member 6. be done.

On the other hand, the sliding projection 31a of the slider 30a is formed larger than the writing element insertion hole 46a, and the lower end surface of the sliding projection 31a is locked to the upper end of the stepped portion 44.

In addition, the guide groove 45a, the writing element insertion hole 46a,
and the coil spring receiving part 47a are omitted because they are on the opposite side.

Furthermore, a knob member guide groove 48 is provided on one side surface of the cam insertion portion 42 . The knob member guide groove 48 communicates with the guide grooves 45 and 45a, and when the cylindrical cam 5 is rotated, the knob member protruding inside the cylindrical cam 5 is connected to the guide groove 4 on the other side.
5 or the guide groove 45a.

The shaft head 43 is inserted into the engagement plate of the cylindrical cam 5 and protrudes so that a coil spring 49 for biasing the knob member 6 can be attached thereto. 43a and 43b are pin insertion holes.

Next, the cylindrical cam 5 will be explained based on FIGS. 4 and 5.

The cylindrical cam 5 has a shaft head 4 of the cylinder 4 at its upper end.
An engagement plate 50 into which the cylindrical cam 3 is inserted is provided, the lower end surface of which is cut diagonally with respect to the axis of the cylindrical cam 5, and a flat part 51 is formed at the upper end of the engagement plate 50, and cam surfaces 52, 53 are formed symmetrically. The distal end portions 54 of the lower ends of the cam surfaces 52, 53 protrude, and are fitted into the notches 34, 34a of the sliders 30, 30a and stopped.

A knock member insertion hole 55 is formed in the side surface of the cam surfaces 52, 53 where the tip portions 54 are located above. When the cylindrical cam 5 is mounted on the cylinder 4, the knob member insertion hole 55 is located at a position that substantially faces the knob member guide groove 48 of the cam insertion portion 42, and allows the inserted knob member 6 to move in the axial direction to the pencil element 20. It is sized sufficiently to provide a knocking action.

As shown in FIG.
A pressing part 62 is connected to the lower end of the sliding part 60 via a bent part 61 bent inward, and a fixing part 63 is provided at the upper end. The slide part 60 slides on the outside of the cylindrical cam 5, and the bending part 61 and the pressing part 6
2 is inserted through the knob member insertion hole 55 of the cylindrical cam 5, positioned inside the cylindrical cam 5, and is configured to abut against the upper end of the slider 30 of the pencil element 20. The fixing part 63 is inserted into the side surface of the sliding tube 7 and fixed thereto.

The sliding tube 7 is a cylindrical body, and step portions 70 and 71 are formed on the inner and outer surfaces of the lower end, respectively. The cap 8 is engaged with the outer step 71, and the pin 72 inserted into the pin insertion 43a of the shaft head 43 of the cylinder 4 is engaged with the inner step 70. An insertion hole 7 for fixing the fixing part 63 of the knob member 6 is provided on the lower side surface.
3 is formed.

The height of the sliding tube 7 is formed to be sufficient for the knock operation, and by moving the sliding tube 7 in the axial direction, the knock member 6 fixed thereto is simultaneously moved and the pencil element 20 is moved. Perform centering. The sliding tube 7 has a coil spring 4 attached to the shaft head 43.
9 is always biased toward the head.

The cap 8 has a clip 80 on its side, is rotatably disposed outside the cylinder 4, and its lower end is slidable relative to the upper end of the shaft case 1. The kit 8 is fixed to the sliding tube 7 by screwing or gluing. Therefore, when the cap 8 is rotated, the sliding tube 7 and the knob member 6, which are integrated therewith, also rotate, and the rotation of the knob member 6 also causes the cylindrical cam 5 to rotate back and forth by 180 degrees. Become. Further, when the cap 8 is moved in the axial direction, the knob member 6 slides on the outer surface of the cylindrical cam 5, and only the knob member 6 moves without moving the cylindrical cam 5, making it possible to apply a knocking action to the pencil element 20. can.

Next, the assembly of these parts will be described. First, the coil springs 35, 35a are attached to the writing elements 20, 21, respectively, and the sliders 30, 30a are connected. These writing elements 2 are attached to the sliders 30, 30 by locking the lower ends of the coil springs 35, 35a to the receiving parts 47, 47a.
The guide grooves 45, 45a of the cylinder 4 and the writing element insertion holes 46, 4 are arranged so as to bias the a in the axial direction.
Insert into 6a.

Next, the shaft head 43 of the cylinder 4 into which the writing element 2 has been inserted is fitted into the engagement plate 50 of the cylindrical cam 5.
It is rotatably supported by a pin 74 inserted into the pin insertion hole 43b via the washer 57. Further, a coil spring 49 is attached to the shaft head 43, inserted into the sliding tube 7, and integrally supported by a pin 72 inserted into the pin insertion hole 43a. Thereafter, the bent portion 61 and the pressing portion 62 of the knob member 6 are inserted through the through hole 55 of the cylindrical cam 5, and the fixing portion at the upper end is fitted into the insertion hole 73 of the sliding tube 7 and fixed. Finally, it is only necessary to fix the kit 8 to the sliding tube 7.

Next, the operation of knocking on the sharp pencil element 20 will be explained.

8 and 9 show the sharpening pencil element 20
FIG. 2 is a partially sectional front view of a main part showing a state in which the writing device is housed in a cylinder 4 and in a writing position.

The slider 30 is positioned by sliding on the cam surface 52 and engaging with the tip 54. At this time, the slider 30a is located on the back side of the cylinder 4, but is in contact with the upper surface of the guide groove 45a. If the cap 8 is moved in the axial direction in this state, the knob member 6 will move at the same time and come into contact with and press the top surface of the slider 30. Further, when the pencil 8 is moved, a knocking operation is applied to the pencil element 20, and the lead is fed out.

By rotating the cylindrical cam 5, the cam surface 5
The action of the pencil element 20 and the ballpoint pen element 21 being alternately moved forward and backward into the writing position by the sliders 30 and 30a that slide with the sliders 2 and 53 is well known, so a description thereof will be omitted. Ballpoint pen element 2
1 is in the writing position, the lower end surface of the slider 30a is engaged with the stepped portion 44 of the cylinder 4, and no knocking operation is performed.

It should be noted that this invention is of course not limited to the embodiments, and both may be used as knock-type mechanical pencils. In this case, it is natural that the slider 30a is formed smaller than the writing element insertion hole 46a.

In addition, the sliding tube 7 and the cap 8 are integrally molded,
The knob member 6 may be directly fixed to the inner surface of the cap 8. Furthermore, a guide groove for guiding the knob member may be formed on the outer surface of the cylindrical cam 5. When the guide groove is formed in this way, the knob member can slide more smoothly.

(Effects of the invention) Since this invention is constructed as described above, the centering notch operation is performed not by pressing the protrusion of the slider with the tip of the cylindrical cam, but by using the notch member and pressing the center of the slider. Since it can be pressed, the knock operation can be performed smoothly.

In addition, since the knob member is inserted through the insertion hole formed on the side surface of the cylindrical cam, even though the knob member contacts the top surface of the slider,
It can be moved back and forth in the axial direction together with the cap.

Furthermore, since the number of parts is small, material costs and assembly man-hours can be reduced, making it possible to provide an inexpensive dual-action writing instrument.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 shows the knock-type mechanical pencil element in the writing position;
FIG. 2 is a perspective view of a cylinder housing a writing element with a slider connected to the rear end; FIG. 3 is a cross-sectional view of a portion of the main part in FIG. 2; FIG. 5 and 5 are a perspective view and a sectional view of the cylindrical cam, FIG. 6 is a perspective view of the knob member, FIG. 7 is a perspective view of the sliding tube, and FIGS. 8 and 9.
The figure is a partial cross-sectional front view showing the relationship between the slider and the knob member, FIG. 8 shows the state before the knob member is moved, and FIG. 9 is a state in which the knob member is moved and the writing element is advanced. Indicates the condition. 1 is a shaft case, 2 is a writing element, 3 is a slider, 4 is a cylinder, 5 is a cylindrical cam, 6 is a knob member, 7 is a sliding tube, 8 is a cap, 10 is a shaft case tip opening, 20 is a sharp pencil element , 21
2 is a ballpoint pen element, 22 is a lead feeding mechanism, 2
3 and 24 are connecting pipes, 30 and 30a are sliders, 31 and 31a are sliding projections, 32 is a fitting part, 3
3 is an inclined surface, 34 is a notch, 35 is a coil spring,
40 is a body part, 41 is a screw part, 42 is a cam insertion part, 43 is a shaft head, 43a, 43b are pin insertion holes,
44 is a stepped portion, 45, 45a are guide grooves, 46, 4
6a is a writing element insertion hole, 47, 47a are receiving parts, 4
8 is a knob member guide groove, 49 is a coil spring, 50
51 is a flat part, 52 is a cam surface, 54 is a tip part, 55 is a knob member insertion hole, 57 is a washer, 60 is a sliding part, 61 is a bending part, 62 is a pressing part, 63 is a fixing part , 70 and 71 are stepped portions, 72 is a pin, 73 is an insertion hole, 74 is a pin, and 80 is a clip.

Claims (1)

[Claims for Utility Model Registration] A plurality of writing elements, at least one of which is a knock-type sharp pencil element, are inserted into a guide groove of a cylinder connected to a shaft case, and a slider is provided at the rear end of the writing element. connected, and further rotatably mounted on the outside of the cylinder,
A compound writing instrument comprising a cylindrical cam that engages with the slider of the writing element and alternately advances and retreats each writing element to the writing position by sliding with a cam surface on the lower end surface, wherein the rotatable cylindrical cam A knob member insertion hole is bored in the side surface of the cap, and the tip of the knob member, which moves in the axial direction together with the cap, is inserted into this hole, and the tip of the inserted knob member is inserted into the rear end of the sharp pencil element. 1. A dual-action writing instrument, characterized in that it is brought into contact with a slider, and the reciprocating movement of the knock member is transmitted as a knock operation to a sharp pencil element via the slider to perform centering.