KR20020077545A - Safety Knock-Type Writing Instrument - Google Patents

Abstract

PURPOSE: A safe lock type writing tool is provided to prevent the leakage of ink due to the contact between a lead tip and clothes of a user, and to simplify a whole structure of the writing tool, thus improving a productivity thereof. CONSTITUTION: The safe lock type writing tool comprises an outer case(2) formed with a moving groove(4) on the upper part thereof; a lead(6) inserted into the outer case, the lead containing ink and being formed with a writing tip(7) at the one distal end; an elastic member(8) installed in the outer case to force the lead toward an opposite direction of the lead tip; a clip(10) projecting to the moving groove of the outer case with being spaced apart from the outer case, the clip being formed with a lock protrusion(12) on the inner surface; and a movable member(20) having an operating piece(22) movably assembled to the outer case so as to be movably inserted into the moving groove, the operating member being formed with a circulation cam groove(30) that the stepped bottom surface forms a ring shaped portion in order to allow the lock protrusion to be circulated by 360degrees.

Description

Safety Knock-Type Writing Instrument

According to the present invention, the writing state is automatically released when the clip is lifted to insert the clip into the collar or the pocket collar in the writing state in which the writing tip is exposed, and the tip of the writing lead directly contacts the pocket cloth of the clothes or the shirt so that ink leaks. It relates to a safety knock-type writing instruments that can be prevented.

In general, writing instruments include pencils, ballpoint pens, and signature pens. Applicators for applying a correction liquid or the like are known as instruments similar to writing instruments.

The writing instrument is a fixed type to protect the exposed tip portion using the lid and the exposed tip is fixed to the outer cylinder in the state that the tip is exposed, and the writing unit is movable to assemble the outer cylinder and the tip is exposed to the outside of the outer cylinder according to the operation of the pressing member. There is a knock type that can be inserted or inserted.

Conventional knock-type writing instruments are configured such that when the pressing member is pressed once, the writing core is moved so that the tip portion is exposed to the outside of the cap fixed to the lower end of the outer cylinder, and when the pressing member is pressed again, the writing core is moved and the tip portion is concealed into the cap fixed to the outer cylinder. .

Knock-type writing instruments as described above is installed on the lower end of the writing core to apply a force to the opposite side of the tip, press the pressing member once to maintain the moved state and press again to install the knock means to return.

However, the conventional knock-type writing instruments as described above, while the user writes, forgets to conceal the tip portion of the writing core to the inside of the cap fixed to the outer cylinder by reactivating the knocking means. The case where the ring of the clip formed on the upper portion of the outer cylinder is inserted into the pocket formed in the case may be stored. If the writing instrument is inserted into the pocket with the tip exposed as described above, the tip comes into contact with the cloth and the ink flows out. This can cause clothes to be contaminated or stained.

Therefore, in order to solve the above problems, the safety knock-type writing instruments configured to conceal the inside of the cap fixed to the outer cylinder of the cap is fixed by lifting the hook of the clip fixed to the outer cylinder in order to insert the writing instrument into the pocket of clothes, etc. Is being proposed.

However, the conventional safety knock-type writing instruments are complicated structure for the safety knock and use separate parts, the assembly is difficult and productivity is reduced.

An object of the present invention is to solve the above problems, it is to provide a safety knock-type writing instrument configured to automatically release the knock state when lifting the clip in the writing state exposed the tip portion of the writing core.

1 is an exploded perspective view showing a first embodiment of a safe knock writing instruments according to the present invention.

Figure 2 is an assembled cross-sectional view showing a writing state in the first embodiment of the safety knock-type writing implement according to the present invention.

Figure 3 is an assembled cross-sectional view showing a storage state in the first embodiment of the safety knock-type writing instruments according to the present invention.

Figure 4 is a partially enlarged assembly cross-sectional view showing a state in which the clip lifted in the first embodiment of the safety knock-type writing implement according to the present invention.

Figure 5 is a partially enlarged perspective view showing a circulation cam groove in the first embodiment of the safety knock-type writing implement according to the present invention.

Figure 6 is a development view showing a cross-sectional view cut along the center line of the circulation cam groove in the first embodiment of the safety knock-type writing instruments according to the present invention.

7 is a perspective view showing a moving member in a second embodiment of the safety knock-type writing implement according to the present invention.

8 is a cross-sectional view showing the bottom surface of the clip in the second embodiment of the safety knock-type writing implement according to the present invention.

9 is an exploded perspective view showing a third embodiment of the safety knock-type writing implement according to the present invention.

10 is an assembled sectional view showing a writing state in the third embodiment of the safety knock-type writing implement according to the present invention.

Figure 11 is an assembled cross-sectional view showing a state in which the clip lifted in the third embodiment of the safety knock-type writing implement according to the present invention.

12 is a partially enlarged assembled sectional view showing a state in which a clip is lifted in a third embodiment of a safety knock writing instrument according to the present invention;

Safety knock writing instruments proposed by the present invention is formed in a predetermined shape and the outer cylinder to cut a portion of the upper portion to form a moving groove, is inserted into the interior of the outer cylinder is installed and the ink is stored inside, one end of the writing A writing core which is made of a tip is installed, and an elastic member which is installed inside the outer cylinder and always exerts force on the writing core opposite to the tip, protrudes toward the moving groove of the outer cylinder and is installed at a predetermined distance from the outer cylinder. The inner portion of the clip is projected toward the outer cylinder to form a knock projection, the movable piece is assembled so as to be movable in the longitudinal direction to the outer cylinder in the longitudinal direction of the outer cylinder on one side so as to be movably inserted into the moving groove. The bottom surface is opened in a ring shape in a plurality of stages so that the knocking protrusion is in contact with the operating piece and rotates 360 °. It includes a moving member is formed a circulation cam groove.

The working piece of the movable member forms an inner side surface of the circulation cam groove, and an upper side is further provided with a locking protrusion having a locking groove formed by the knock protrusion inserted therein.

Next, a preferred embodiment of the safety knock-type writing instrument according to the present invention will be described in detail with reference to the drawings.

First, the first embodiment of the safety knock-type writing instruments according to the present invention is formed in a predetermined shape, as shown in Figures 1 to 2, the outer cylinder (2) to form a moving groove (4) by cutting a portion of the upper, and It is inserted into the inside of one outer cylinder (2) and is installed inside the outer cylinder (2) and the writing core (6) having a tip (7) for writing is stored inside and ink is stored at one end; An elastic member 8 which always applies a force to the writing core 6 on the opposite side of the tip 7 and protrudes toward the moving groove 4 of the outer cylinder 2 is installed at a predetermined distance from the outer cylinder 2. The inner surface of the end portion is assembled with the clip 10 protruding toward the outer cylinder 2 and the knock protrusion 12 is formed to be movable in the longitudinal direction to the outer cylinder 2 and the longitudinal direction of the outer cylinder 2 on one side. Prolonged along the operation piece 22 is formed to be movably inserted into the movement groove 4 is formed and the operation piece 22 ) Includes a moving member 20 is formed with a circulating cam groove 30 is connected to the bottom surface in a ring shape in a plurality of stages so that the knock projection 12 is in contact with the 360 ° circulating.

As shown in Figures 1 and 5 on the operation piece 22 of the moving member 20, the knocking protrusions formed on the inner side surface of the circulation cam groove 30 and the upper side (see the right side in Figure 3). A locking protrusion 40 to which the locking groove 42 to which the 12 is inserted is formed is further installed.

The outer cylinder 2 and the clip 10 can be integrally formed as shown in Fig. 1, or can be integrally formed by manufacturing and assembling each component.

As shown in FIGS. 2 and 3, the knock protrusion 12 of the clip 10 is formed at a predetermined height so as to be in close contact with the circulation cam groove 30 of the moving member 20 in a normal state. The clip 10 is formed to have a predetermined elastic force so that the knock protrusion 12 is maintained in close contact with the circulation cam groove 30 at all times.

In addition, in order to prevent the movable member 20 from being separated out of the outer cylinder 2 by the elastic force of the elastic member 8, as shown in FIGS. 1 and 3, the movable member described above. 20 is formed by protruding the departure preventing protrusion 24, and formed so that the end portion of the moving groove 4 of the outer cylinder (2) is blocked so that the separation preventing projection 24 is caught or It is configured such that the above-mentioned separation preventing protrusion 24 is caught in a portion connected to the outer cylinder 2 of one clip 10.

When the separation preventing protrusion 24 is formed to protrude from the moving member 20 as described above, and then the moving member 20 is assembled to the outer cylinder 2, the above-described movement for ease of assembly. It is preferable to cut a part of the cylindrical portion 26 of the member 20 in the longitudinal direction to form the shrinkage groove 27.

In the above-mentioned separation preventing protrusion 24 is preferably formed in the cylindrical portion 26 of the portion where the shrinkage groove 27 is formed.

The separation preventing protrusion 24 is formed so that the sliding movement is inserted into the moving groove (4).

As shown in FIGS. 1 and 2, the outer cylinder 2 has a cone-shaped cap 3 on which the tip 7 of the writing lead 6 and the elastic member 8 are located. It is formed integrally.

In the above description, the cone-shaped cap 3 is described as being integrally formed in the outer cylinder 2. However, as shown in FIG.

The elastic member 8 is made using a compression coil spring.

As shown in FIGS. 5 and 6, the circulation cam groove 30 formed in the operation piece 22 of the moving member 20 is moved toward the cap 3 of the outer cylinder 2. The locking projection 40 is connected to the first cam groove 31 in contact with the knock projection 12 of the clip 10 and the first cam groove 31, and the knock projection 12 is moved forward. The knock cam 12 is connected to the second cam groove 32 and the second cam groove 32 to guide the locking groove 42 toward the locking groove 42. The moving member 20 is connected to the third cam groove 33 and the third cam groove 33 and the first cam groove 31 to guide the direction away from the locking groove 42 of the locking projection 40. When the reverse when the knock projection 12 is made of a fourth cam groove 34 in contact with.

In the above, the second cam groove 32 is connected to the first cam groove 31 in a low step shape, the third cam groove 33 is connected to the second cam groove 32 in a step shape low, and the fourth cam groove 34. Is lower connected to the third cam groove 33 in a step shape, and the first cam groove 31 is connected to the fourth cam groove 34 in a step shape.

In the above, the first cam groove 31 is formed of an inclined surface gradually increasing from the fourth cam groove 34 side to the second cam groove 32, the fourth cam groove 34 from the third cam groove 33 side The bottom surface is gradually made of inclined surface is connected to the first cam groove (31).

When the circulation cam groove 30 is formed as described above, the knock protrusion 12 is moved from the first cam groove 31 toward the fourth cam groove 34 and from the second cam groove 32 toward the first cam groove 31. From the third cam groove 33 to the second cam groove 32, the fourth cam groove 34 from the side can not be moved toward the third cam groove side 33, respectively.

Therefore, the knock protrusion 12 has the first cam groove 31 → the second cam groove 32 → the third cam groove 33 → the fourth cam groove 34 as the moving member 20 moves forward and backward. It is configured to sequentially contact the first cam groove (31).

In the storage state (see FIG. 3), the movable member 20 moves backward and the tip 7 of the writing lead 6 is completely located inside the cap 3 of the outer cylinder 2 (see FIG. 3). The protrusion 12 is positioned in contact with the first cam groove 31, and the movable member 20 is advanced so that the tip 7 end of the writing core 6 is outside the cap 3 of the outer cylinder 2. In the written state (see FIG. 2) exposed to the knock projection 12 is configured to be positioned in contact with the third cam groove (33).

The first cam groove 31, the second cam groove 32, the third cam groove 33, and the fourth cam groove 34 are sequentially connected to each other in a planar shape (M) in a plan view (front of FIG. 5). Form to achieve.

The guide piece protruding toward the locking groove 42 of the locking projection 40 in a substantially "대략" shape in order to achieve the "M" shape of the circulation cam groove 30 in the operation piece 22 of the moving member 20. The protrusions 28 are formed.

One end of the locking protrusion 40 is formed in a substantially "M" shape to form a locking groove 42, and the other end (the opposite side of the locking groove 42) is approximately in a "대략" shape. It is formed to protrude toward the circulation cam groove (30).

The stepped boundary line between the first cam groove 31 and the second cam groove 32 is formed to be connected to an end portion of one edge of the locking groove 42 of the locking protrusion 40. Between the line drawn in the circumferential direction at one corner end of the locking groove 42 and the line drawn toward the release preventing protrusion 24 in parallel with the longitudinal direction of the operating piece 22 at one corner end of the locking groove 42 described above. It is formed to be located.

In the above-described knockout protrusions, the boundary line between the first cam groove 31 and the second cam groove 32 is formed in a direction extending in the same straight line from one corner of the locking groove 42. 12 is preferable because it is naturally guided toward the locking groove (42).

In addition, the stepped boundary line between the second cam groove 32 and the third cam groove 33 is connected to the end of the edge of one side of the engaging groove 42 and the vertex of the guide projection 28. Form by connecting.

The stepped boundary line between the third cam groove 33 and the fourth cam groove 34 is formed to be connected to the end of the other side (back of the circulation direction) of the engaging groove 42, and the locking groove At the other corner end of the 42, a line drawn from the vertex of the guide projection 28 and the other end of the engaging groove 42 at the other corner end of the release preventing projection 24 in parallel with the longitudinal direction of the operating piece 22 To be located between the lines drawn toward the

Wherein the end of the edge connecting the third cam groove 33 and the fourth cam groove 34 is formed so as to connect the other corner end point of the engaging groove 42 and the vertex of the guide projection 28. It is preferable that the knock projection 12 is guided to naturally escape the locking groove 42.

In addition, the portion where the fourth cam groove 34 and the first cam groove 31 are connected is formed to form a substantially "Ｖ" shape in plan view.

The stepped boundary line between the fourth cam groove 34 and the first cam groove 31 is formed to be connected to the “∨” shape vertex of the locking protrusion 40 and the locking protrusion 40. It is formed to be located between the line drawn in the circumferential direction toward the fourth cam groove (34) from the vertex and the line connecting the vertex of the engaging projection 40 and the "∨" shape of the circulation cam groove (30).

In the above, it is formed to extend the tangential boundary line between the fourth cam groove 34 and the first cam groove 31 so as to extend in a tangential direction from the edge of the first cam groove 31 of the locking projection 40. The knock projection 12 is preferable because it is naturally guided toward the first cam groove (31).

Next, an operation process in the first embodiment of the safety knock-type writing instrument according to the present invention configured as described above will be described.

First, when the user presses the movable member 20 for writing in the storage state as shown in FIG. 3, the movable member 20 moves forward toward the cap 3 of the outer cylinder 2, The writing lead 6 moves forward to overcome the elastic force of the elastic member 8, and the tip 7 of the writing lead 6 is exposed to the outside of the cap 3 of the outer cylinder 2.

At this time, as the operation piece 22 of the moving member 20 moves forward, the first cam groove 31 of the circulation cam groove 30 is in contact with the knock protrusion 12 of the clip 10. Gradually changes to a state in contact with the second cam groove (32).

Subsequently, by pressing the moving member 20 to remove the force pressing the moving member 20 while the knock protrusion 12 is in contact with the second cam groove 32, the elastic force of the elastic member 8 As a result, the writing lead 6 moves backward, and the moving member 20 moves backward.

At this time, in the state where the knock projection 12 is in contact with the second cam groove 32, since the step is not passed to the first cam groove 31 by the boundary line, the locking groove 42 of the locking protrusion 40 is described. Is guided toward and changes to a state in contact with the third cam groove (33).

When the knock projection 12 is inserted into the engaging groove 42 in the state in contact with the third cam groove 33, the reverse movement of the moving member 20 is stopped, the writing core 6 of the The tip 7 tip is exposed to the outside of the cap 3 of the outer cylinder 2 to maintain a writing state (see FIG. 2) for writing.

When the user presses the moving member 20 again in the writing state as described above (see FIG. 2), the moving member 20 overcomes the elastic force of the elastic member 8 and moves forward, and the knock protrusion 12 is removed. In the state in contact with the 3 cam groove 33, the step is not passed to the second cam groove 32 by the true boundary line is guided along the rear edge of the circulating direction of the guide protrusion 28 is in contact with the fourth cam groove 34 Change to state.

When the knock protrusion 12 removes the force that pushes the moving member 20 while in contact with the fourth cam groove 34, the writing core 6 is formed by the elastic force of the elastic member 8. It moves backward and the said moving member 20 moves backward.

At this time, since the knock projection 12 is in contact with the fourth cam groove 34, the step is not guided along the fourth cam groove 34 by the edge of the edge, and thus is guided along the fourth cam groove 34. Out of the locking groove 42 of the locking projection 40, the reverse movement of the moving member 20 is made naturally.

If the moving member 20 continues to move backward as described above, the knock projection 12 is changed to a state in contact with the first cam groove 31 from the fourth cam groove 34, the knock projection 12 Is caught in the "∨" shape of the circulation cam groove 30, the movement of the moving member 20 is stopped, the tip 7 of the writing lead 6 is completely outer cylinder ( The concealed storage state (see FIG. 3) inside the cap 3 of 2) is maintained.

As described above, as the user repeatedly presses the moving member 20, the writing state and the storage state are sequentially and repeatedly changed.

And while the user does not press the moving member 20 again in the writing state (see FIG. 2) to change the storage state (see FIG. 3), as shown in FIG. When the end of the lifted away from the outer cylinder (2), the knock projection 12 is released from the state inserted into the circulation cam groove 30, the knock projection 12 is a block of the operation piece 22. Since the retracted groove 42 is caught in the holding groove 42, even when the elastic force of the elastic member 8 is applied, the backward movement of the movable member 20 is released from the restrained state, and the elastic force of the elastic member 8 is prevented. By this, the writing lead 6 and the moving member 20 move backward, and the tip 7 of the writing lead 6 is changed into a storage state concealed inside the cap 3 of the outer cylinder 2.

At this time, the separation preventing protrusion 24 is caught by a portion connected to the outer cylinder 2 of the clip 10, thereby preventing the moving member 20 from being separated outward of the outer cylinder 2.

And the second embodiment of the safety knock-type writing instruments according to the present invention, as shown in Fig. 7 and 8, to form a knock projection 46 on the operating piece 22 of the moving member 20, A circulation cam groove 14 and a locking protrusion 16 are formed on a surface of the clip 10 facing the outer cylinder 2.

The circulation cam groove 14 and the locking projection 16 are formed in a shape in which the rotation cam groove 30 and the locking protrusion 40 of the first embodiment are rotated by 180 °.

That is, in the first embodiment, the circulation cam groove 30 moves to be in contact with the knock projection 12. In the second embodiment, the knock projection 46 is moved to be in contact with the circulation cam groove 14. For the circulation cam groove 30 of the first embodiment, the shape of the circulation cam groove 14 should be formed to have a rotational symmetry of 180 ° to perform normal operation.

Also in the above-described second embodiment, it is possible to carry out the same configuration as the above-described first embodiment except for the above-described configuration, and since the same operation as in the above-described first embodiment is performed, detailed description thereof will be omitted.

And the third embodiment of the safety knock-type writing instruments according to the present invention is formed in a predetermined shape, as shown in Figure 9 and 10, the upper portion is cut off to form a moving groove (4) and the moving groove (4) An outer cylinder (2) forming a circulation cam groove 50 is connected to the bottom surface in a ring shape in a plurality of stages so as to be able to circulate 360 ° adjacent to, and is inserted into the outer cylinder (2) is installed and installed inside Ink is stored and the writing core 6 is provided with a tip 7 for writing at one end, and is installed inside the outer cylinder 2 and is always pressed against the tip 7 with the writing core 6. On one side of the movable member 20 and the movable member 20, which is assembled to be movable in the longitudinal direction to the outer cylinder 2, the movable member 20 which applies the elastic member 8 to the writing core 6, Protruding toward the moving groove 4 of the outer cylinder (2) is installed at a predetermined distance from the outer cylinder (2) end If there comprises a clip (80) that knock projections 82 in contact is inserted into the circular cam groove 50 to protrude toward the outer tube (2) is formed.

The outer cylinder (2) forms an inner side surface of the circulation cam groove (50) and the lower projection (60) is formed on the bottom (left side in FIG. 10) the locking projection (60) in which the locking groove is formed by the knock protrusion 82 is inserted. Is installed more.

In the third embodiment as well, as in the second embodiment, the knock protrusion 82 moves and contacts the circulation cam groove 50. Therefore, the circulation cam groove 30 and the locking projection of the first embodiment are the same. The shape of the circulation cam groove 50 and the locking projection 60 with respect to 40 is formed by 180 ° rotationally symmetrical.

The specific shape of the circulation cam groove 50 and the locking projection 60 can be implemented in the same configuration as in the first embodiment, so detailed description thereof will be omitted.

In the third embodiment described above, the outer cylinder 2 and the cap 3 are manufactured as separate parts and assembled. However, the third embodiment may be integrally formed as in the first embodiment.

The clip 80 is provided with a support member 84, the middle portion of which is bent at a predetermined angle, in the installation groove 72 formed on one side of the movable member 70, and on the support member 84. It is installed on the moving member 70 by connecting.

In the above, the clip 80, the support member 84, and the movable member 70 may be integrally formed, or may be manufactured and assembled into each component.

The support member 84 imparts an elastic force to the clip 80 so that the intermediate portion is predetermined so that the knock projection 82 is in close contact with the circulation cam groove 50 formed in the outer cylinder 2. In a state formed by bending at an angle, the movable member 70 is inclined at a predetermined angle again.

In addition, between the support member 84 and the movable member 70 may be provided with a pressing spring 78 to give a greater elastic force to the clip (80).

In the above, the clip 80 is described as being installed on the movable member 70 through the support member 84 formed by bending at a predetermined angle. However, the present invention is not limited thereto, and the first embodiment is not limited thereto. In an example, as the clip 10 is directly connected to the outer cylinder 2, it is also possible to integrally protrude directly from the end of the moving member 70 to a predetermined height.

In addition, the movable member 70 protrudes from one side of the outer circumferential surface of the separation preventing protrusion 74 for preventing the outside of the outer cylinder 2 from being separated by the elastic force of the elastic member 8.

In addition, the inner surface of the outer cylinder (2) is formed with a guide groove (75) which is inserted and moved to the departure prevention protrusion 74, and protrudes inward to the inner surface of the end of the outer cylinder (2) the separation The locking projection 76 is formed to catch the projection (74).

In the above, in order to prevent the moving member 70 is separated from the outside of the outer cylinder (2) is formed a departure preventing projection (74) on the moving member (70) and the separation preventing projections 74 described above on the inner surface of the outer cylinder (2). (2) is described as forming a guide groove (75) which is movably inserted, but the hole into which the above-mentioned separation preventing protrusion (74) is movably inserted is inserted into the outer cylinder (2) to enable injection molding using a core. It is also possible to form.

In addition, although not shown in the drawings, the movable member 70 is formed on both sides of the end surface of the movable groove 4 of the outer cylinder 2 to form projections protruding toward the groove, and is movably inserted into the movable groove 4. It is also possible to prevent the separation of the movable member 70 by configuring a portion of the support member 84 to which the and the clip 80 is connected to the protrusion.

Also in the above-described third embodiment, the present invention can be implemented in the same configuration as the above-described first embodiment and / or the second embodiment, and the same operation is performed. Therefore, detailed description thereof will be omitted.

That is, in the third embodiment, the writing state (see FIG. 10) and the storage state (see FIG. 11) are repeatedly made as the moving member 70 is repeatedly pressed, and the writing state is shown in FIG. As you lift the end of the clip 80 is changed to the storage state.

In the above description of the preferred embodiment of the safety knock-type writing instruments according to the present invention, the present invention is not limited to this, it is possible to perform various modifications within the scope of the claims and the detailed description of the invention and the accompanying drawings. This also belongs to the scope of the present invention.

According to the safety knock-type writing instruments according to the present invention made as described above, when the user lifts up to insert the clip on the collar or pocket collar without changing from the writing state to the storage state, the tip of the writing core is automatically In contact with the ink is prevented from spilling.

Therefore, ink does not leak out and the cloth is not polluted.

In addition, according to the safety knock-type writing implement according to the present invention, since the safety knock is performed using a structure for knocking without providing a separate structure or parts for the safety knock, the structure is simple, and the reduction of the original cost is achieved.

In addition, according to the safety knock-type writing implement according to the present invention, since it is possible to form the outer cylinder and the cap integrally, the number of parts is reduced and the assembly and productivity are improved.

In addition, according to the safety knock-type writing implement according to the present invention, it is possible to design a variety of designs because it provides by adopting a new knock operation and the safety knock method.

Claims (6)

Is formed in a predetermined shape and the outer portion to form a moving groove by cutting a portion of the upper portion, The writing core is inserted into the inside of the outer cylinder is installed, the ink is stored therein and the tip is installed at one end of the writing, and An elastic member which is installed inside the outer cylinder and always exerts a force on the opposite side of the tip to the writing core; A clip which protrudes toward the moving groove of the outer cylinder and is disposed at a predetermined distance from the outer cylinder, and protrudes toward the outer cylinder on the inner end thereof to form a knock protrusion; The outer cylinder is assembled to be movable in the longitudinal direction and protrudes along the longitudinal direction of the outer cylinder on one side to form a working piece which is movably inserted into the moving groove, and the knock piece is in contact with the knocking protrusion 360 °. Safety knock-type writing instruments comprising a moving member is formed with a circulating cam groove is connected to the bottom surface in a ring shape in a plurality of stages to circulate. Is formed in a predetermined shape and the outer portion to form a moving groove by cutting a portion of the upper portion, The writing core is inserted into the inside of the outer cylinder is installed, the ink is stored therein and the tip is installed at one end of the writing, and An elastic member which is installed inside the outer cylinder and always exerts a force on the opposite side of the tip to the writing core; The outer cylinder is assembled so as to be movable in the longitudinal direction and protrudes along the longitudinal direction of the outer cylinder on one side to form a movable piece that is movably inserted into the moving groove, and the operating piece protrudes outward of the outer cylinder to the knock projection. The moving member is formed, It is installed at a predetermined distance from the outer cylinder by protruding to the moving groove side of the outer cylinder, and the end of the outer cylinder inner surface of the end of the circulating cam groove in which the bottom surface is connected in a ring shape in a plurality of stages so that the knock protrusion can be contacted 360 ° circulation Safety knock writing instruments comprising a clip is formed. According to claim 1 or 2, wherein the moving member is formed by protruding the departure prevention projections, Consists of the above-mentioned separation prevention projections on the part connected to the outer cylinder of the clip, Safety knock type writing instruments to cut a portion of the cylindrical portion of the movable member in the longitudinal direction to form a shrinkage groove. An outer cylinder which is formed in a predetermined shape and forms a circulating cam groove in which a plurality of ends are connected to the bottom surface in a ring shape so as to form a moving groove by cutting a portion of the upper portion and rotating 360 ° adjacent to the moving groove; The writing core is inserted into the inside of the outer cylinder is installed, the ink is stored therein and the tip is installed at one end of the writing, and An elastic member which is installed inside the outer cylinder and always exerts a force on the opposite side of the tip to the writing core; A moving member assembled to the outer cylinder in a longitudinal direction and in contact with the writing core; Safety rust including a clip on one side of the moving member protruding toward the moving groove of the outer cylinder is provided at a predetermined interval with the outer cylinder, and the inner end portion is projected toward the outer cylinder to form a knock protrusion in contact with the circulation cam groove. Classic writing instruments. The safety knock-type writing implement according to any one of claims 1, 2, and 4, further comprising a locking protrusion which forms an inner side surface of the circulation cam groove and is formed with a locking groove into which the knock protrusion is inserted. The method of claim 5, wherein the circulating cam groove is the first cam groove which the knock projection is in contact with the moving member, the advance; A second cam groove connected low to the first cam groove in a step shape and guiding the knock protrusion toward the locking groove of the locking protrusion; A third cam groove which is connected to the second cam groove low in a step shape and guides the knock projection toward the outside of the locking groove of the locking projection when the moving member moves forward again; The safety knock-type writing implement comprising a fourth cam groove connected to the third cam groove low in the step shape and connected to the first cam groove high in the step shape and the knock protrusion is in contact when the moving member moves backward.