JP2021187062A - Knock type writing instrument - Google Patents

Abstract

To provide a knock type writing instrument having a knock mechanism which can meet various demands about its design or layout.SOLUTION: A knock type writing instrument 1 includes an operation part 30 and a cover member 50 which covers a rear end part of the operation part 30. A fitting hole 35 is provided on a rear end surface of the operation part 30, and a fitting part 51 protruding forward is provided on an inner rear end surface of the cover member 50. The fitting part 51 is inserted into the fitting hole 35 to fit therewith and thereby causes the cover member 50 to fit in the operation part 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to a knock-type writing instrument.

The writing part, which is the pen tip, has an operation part at the rear end of the shaft cylinder, and the writing part, which is the pen tip, is shafted by performing a knock operation that pushes the operation part forward against the urging force of the spring arranged in the shaft cylinder. A so-called knock-type knock-type writing instrument that can switch between a writing state protruding from the tip of a cylinder and a non-writing state in which the writing portion is immersed in the shaft cylinder is known (for example, Patent Document 1).

In a general knock-type writing instrument as shown in Patent Document 1, the operation of switching between the writing state and the non-writing state by the knock mechanism will be described with reference to the schematic views shown in FIGS. 14 and 15. FIG. 14 is a schematic view of a knock mechanism 100 having a barrel 130, an operation unit 140, and a rotor 150 developed in the circumferential direction. FIG. 15 is a schematic view showing the positional relationship between the barrel 130, the operation unit 140, and the rotor 150, and is a locking projection of the operation unit 140 with respect to the outer cam 131 expanded in the circumferential direction. It shows the position of the inner cam 156 of 141 and the rotor 150. In the figure, the lower part is the front of the knock-type writing instrument, and the lower part is the front of the knock-type writing instrument. Since the rotor 150 rotates around the central axis for each knock operation, it moves from right to left in the figure.

The knock mechanism 100 of the knock-type writing instrument has a shaft cylinder 130, an operation unit 140, and a rotor 150 arranged in front of the operation unit 140. At the rear end of the inner peripheral surface of the barrel 130, four outer cams 131 are provided at equal intervals in the circumferential direction. The adjacent outer cams 131 define four first guide grooves 132 extending in the front-rear direction. Each of the outer cams 131 is composed of a first protrusion 133, a second protrusion 134, and a third protrusion 135 extending in the front-rear direction and continuously arranged in the circumferential direction. The third protrusion 135 arranged in the middle has a thinner radial thickness than the first protrusion 133 and the second protrusion 134. Therefore, a second guide groove extending in the front-rear direction is formed between the first protrusion 133 and the second protrusion 134. The width of the first protrusion 133, the width of the second protrusion 134, the width of the third protrusion 135, and the width of the first guide groove 132 in the circumferential direction are formed to be equal to each other. Therefore, the width of the first guide groove 132 and the width of the second guide groove are equal to each other.

Eight locking projections 141 are provided on the outer peripheral surface on the front side of the operation unit 140 at equal intervals in the circumferential direction. Each of the locking protrusions 141 is located in the first guide groove 132 between the adjacent outer cams 131, or on the third protrusion 135, that is, between the first protrusion 133 and the second protrusion 134. 2 Arranged in the guide groove. Further, each of the locking projections 141 is configured to move in the front-rear direction in the first guide groove 132 or in the second guide groove by a knock operation. A cam surface 142 is formed on the front end surface of the operation unit 140.

On the rear end surface of the rotor 150, a cam receiving surface 153 that cooperates with and has a complementary shape to the cam surface 142 of the operating unit 140 is formed. On the outer peripheral surface of the rotor 150, four inner cams 156 having protrusions extending in the front-rear direction are provided at equal intervals in the circumferential direction. The inner cam 156 engages with the outer cam 131 or is arranged in the first guide groove 132 between the outer cams 131 when the rotor 150 is rotated around the central axis by a knock operation. When the inner cam 156 is arranged in the first guide groove 132 between the outer cams 131, the outer cam 131 is arranged between the inner cams 156.

The knock operation is performed by pressing the operation unit 140 forward and moving it forward to a predetermined position. With the movement of the operation unit 140 by the knock operation, the rotor 150 is pressed and moves forward in the barrel 130. In the non-writing state (FIG. 15 (a)), when the operation unit 140 is moved forward until the inner cam 156 of the rotor 150 exceeds the first protrusion 133 of the outer cam 131 of the barrel 130 (FIG. 15 (FIG. 15)). b)) The cam surface 142 and the cam receiving surface 153 arranged out of phase cooperate with each other, and the rotor 150 rotates until the cam surface 142 and the cam receiving surface 153 coincide with each other (FIG. 15 (c)). )). Next, when the force applied to the operation unit 140 is released, the rear end surface of the inner cam 156 and the front end surface of the outer cam 131 cooperate with each other, and the inner cam 156 is locked with the second protrusion 134 of the outer cam 131. The rotor 150 is rotated until the rotor 150 is turned (FIG. 15 (d)), and the writing state is set.

On the other hand, in the writing state (FIG. 15 (d)), when the operation unit 140 is moved forward until the inner cam 156 of the rotor 150 exceeds the second protrusion 134 of the outer cam 131 of the barrel 130 (FIG. 15). (B)) The cam surface 142 and the cam receiving surface 153 arranged out of phase cooperate with each other, and the rotor 150 rotates until the cam surface 142 and the cam receiving surface 153 coincide with each other (FIG. 15 (FIG. 15). c)). Next, when the force applied to the operation unit 140 is released, the rear end surface of the inner cam 156 and the front end surface of the outer cam 131 cooperate with each other until the inner cam 156 enters the first guide groove 132. Rotate 150 (FIG. 15 (a)) to enter the non-writing state.

Japanese Unexamined Patent Publication No. 2015-003443

By the way, the knock-type writing tool described in Patent Document 1 has a knock mechanism including an operation portion and a cover member covering the rear end portion of the operation portion. By fitting the outer peripheral surface of the operation portion and the inner peripheral surface of the cover member, the operation portion and the cover member are integrally connected.

The operation unit is formed into various shapes other than the shape of the operation unit described in Patent Document 1 depending on the design and design requirements. Therefore, depending on the shape of the operating portion, the fitting structure between the outer peripheral surface of the operating portion and the inner peripheral surface of the cover member as shown in Patent Document 1 may not be applicable. Therefore, the more variations of the fitting structure of the operation portion and the cover member in the knock mechanism, the more various requirements for design and design can be met.

It is an object of the present invention to provide a knock-type writing tool having a knock mechanism capable of meeting various requirements for design or design.

According to one aspect of the present invention, it is a knock-type writing tool including an operation portion and a cover member for covering the rear end portion of the operation portion, and a fitting hole is provided on the rear end surface of the operation portion, and the cover is provided. A fitting portion that protrudes forward is provided on the inner rear end surface of the member, and the cover member is fitted to the operation portion by inserting the fitting portion into the fitting hole and fitting the fitting portion. A knock-type writing tool featuring the above is provided.

A first locking portion is provided on the inner surface of the fitting hole, a second locking portion is provided on the outer surface of the fitting portion, and the first locking portion and the second locking portion can be locked to each other. May be. The cover member may be formed to be transparent or translucent. A regulation protrusion may be provided on the inner surface of the cover member, and the rear end portion of the operation portion may be locked to the regulation protrusion to restrict the entry of the operation portion into the cover member. The operation unit may have an erasing unit capable of erasing the handwriting of the knock-type writing instrument. The knock-type writing instrument is a knock-type writing instrument having a heat-discoloring ink, and the handwriting by the heat-discoloring ink may be thermally discolored by the frictional heat generated when the writing instrument is scratched by the erasing portion.

According to the aspect of the present invention, there is a common effect of providing a knock-type writing tool having a knock mechanism capable of meeting various requirements for design or design.

FIG. 1 is a vertical sectional view of a knock-type writing instrument according to the first embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the rear end portion of the knock-type writing instrument of FIG. FIG. 3 is a perspective view of the rear end portion of the knock-type writing instrument of FIG. FIG. 4 is a vertical cross-sectional view of the rear end of the barrel of the knock-type writing instrument of FIG. FIG. 5 is a perspective view of the operation unit and the rotor of the knock-type writing instrument of FIG. FIG. 6 is a schematic diagram of a knock mechanism showing switching from a non-writing state to a writing state of the knock-type writing instrument of FIG. 1. FIG. 7 is a schematic diagram of a knock mechanism showing switching from a writing state to a non-writing state of the knock-type writing instrument of FIG. 1. FIG. 8 is a vertical sectional view of a knock-type writing instrument according to a second embodiment of the present invention. FIG. 9 is a vertical cross-sectional view of the rear end portion of the knock-type writing instrument of FIG. FIG. 10 is a vertical cross-sectional view of the rear end of the shaft tube of the knock-type writing instrument of FIG. FIG. 11 is a perspective view of the operation unit and the rotor of the knock-type writing instrument of FIG. FIG. 12 is a schematic diagram of a knock mechanism showing switching from a non-writing state to a writing state of the knock-type writing instrument of FIG. FIG. 13 is a schematic diagram of a knock mechanism showing switching from a writing state to a non-writing state of the knock-type writing instrument of FIG. FIG. 14 is a schematic diagram of a knock mechanism of a conventional knock-type writing instrument. FIG. 15 is a schematic diagram of a knock mechanism showing switching from a non-writing state to a writing state of a conventional knock-type writing instrument.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A common reference code is attached to the corresponding components throughout the drawing.

1 is a vertical cross-sectional view of the knock-type writing tool 1 according to the first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the rear end portion of the knock-type writing tool 1 of FIG. 1, and FIG. 3 is a view. It is a perspective view of the rear end portion of the knock type writing instrument 1 of 1.

The knock-type writing tool 1 includes a shaft cylinder 3 formed in a cylindrical shape and having a mouthpiece member 2, a refill 5 which is a cursive body arranged in the shaft cylinder 3 and having a writing portion 4 at one end, and a refill 5. It has a spring 6 for urging rearward and a knock mechanism 10 arranged at the rear end of the barrel 3. The knock mechanism 10 has an outer cam 20, an operation unit 30, a rotor 40, and a cover member 50. The mouthpiece member 2 arranged at the front end portion of the shaft cylinder 3 is formed in a tapered shape toward the front, and a through hole for projecting the writing portion 4 of the refill 5 is formed.

In this specification, in the axial direction of the knock-type writing instrument 1, the writing unit 4 side is defined as the "front" side, and the side opposite to the writing unit 4 is defined as the "rear" side. Further, in the knock-type writing tool 1, the refill 5 moves in the barrel 3 in the front-rear direction by the knock mechanism 10. At this time, the state in which the writing unit 4 is immersed in the barrel 3 is referred to as a non-writing state (FIG. 1), and the state in which the writing portion 4 protrudes from the barrel 3 is referred to as a writing state (not shown).

FIG. 4 is a vertical cross-sectional view of the rear end portion of the axle tube 3 of the knock-type writing tool 1 of FIG. In FIG. 4, the lower part is the front of the knock-type writing tool 1. On the inner surface of the rear end portion of the barrel 3, four outer cams 20 forming a part of the knock mechanism 10 are provided at equal intervals in the circumferential direction. The adjacent outer cams 20 define four first guide grooves 21 extending in the front-rear direction. Each of the outer cams 20 is composed of a first protrusion 22 and a second protrusion 23 that extend in the front-rear direction and are continuously arranged in the circumferential direction. The first protrusion 22 and the second protrusion 23 have the same shape. A second guide groove 24 extending in the front-rear direction is formed between the first protrusion 22 and the second protrusion 23. The width of the first guide groove 21 in the circumferential direction is larger than the width of the second guide groove 24 in the circumferential direction. The depth of the first guide groove 21 and the depth of the second guide groove 24 are the same. In the outer cam 20, a regulating surface 25 is provided at the rear ends of the first guide groove 21 and the second guide groove 24. Further, the surface of the outer cam 20 on the opposite side of the regulation surface 25, that is, the rear end surface of the outer cam 20, constitutes a contact surface 26 to which the front end surface of the cover member 50 can abut.

FIG. 5 is a perspective view of the operation unit 30 (so-called knock rod) and the rotor 40 of the knock-type writing tool 1 of FIG. In FIG. 5, the lower part is the front of the knock-type writing tool 1.

The operation unit 30 is a cylindrical member formed in a loosely tapered shape toward the rear. Eight locking projections 31 are provided on the outer peripheral surface on the front side of the operation unit 30 at equal intervals in the circumferential direction. Each of the locking protrusions 31 is located in the first guide groove 21 between the adjacent outer cams 20 or on the second protrusion 23, that is, between the first protrusion 22 and the second protrusion 23. 2 Arranged in the guide groove 24. Further, each of the locking projections 31 is configured to move in the front-rear direction in the first guide groove 21 or the second guide groove 24 by a knock operation.

A cam surface 32 is formed on the front end surface of the operation unit 30. The cam surface 32 has eight peaks 33 and valleys 34. A circular fitting hole 35 into which the fitting portion 51 of the cover member 50, which will be described later, is inserted is provided at the rear end portion of the operation portion 30. A first locking portion 36 projecting inward in the radial direction is provided on the inner surface in the vicinity of the opening of the fitting hole 35 (FIG. 2).

The rotor 40 includes a small diameter portion 41 inserted inside from the front end portion of the operation portion 30 and used for alignment, and a large diameter portion 42 arranged in front of the small diameter portion 41. The large diameter portion 42 has a larger diameter than the small diameter portion 41. On the rear end surface of the large diameter portion 42, a cam receiving surface 43 having a shape that cooperates with and has a complementary shape to the cam surface 32 of the operating portion 30 is formed. The cam receiving surface 43 has eight peaks 44 and valleys 45 similar to the cam surface 32 of the operation unit 30. On the outer peripheral surface of the large diameter portion 42, four inner cams 46, which are protrusions extending in the front-rear direction, are provided at equal intervals in the circumferential direction. As shown in FIG. 2, the rear end portion of the refill 5 is inserted into the front end opening of the rotor 40. Thereby, the total length of the knock-type writing tool 1 can be shortened.

FIG. 6 is a schematic diagram of a knock mechanism 10 showing switching from a non-writing state to a writing state of the knock-type writing instrument 1 of FIG. 1. That is, FIG. 6 is a schematic view showing the positional relationship between the outer cam 20, the operation unit 30, and the rotor 40, and is a locking projection of the operation unit 30 with respect to the outer cam 20 expanded in the circumferential direction. It shows the position of the inner cam 46 of 31 and the rotor 40. In the figure, the lower part is the front of the knock-type writing tool 1, and the upper part is the rear of the knock-type writing tool 1. The rotor 40 is given a rotational force by the cooperation of the cam surface 32 of the operation unit 30 and the cam receiving surface 43 of the rotor 40, and rotates around the central axis. Therefore, the rotor 40 moves from the right to the left in the figure for each knock operation in FIG.

FIG. 6A is a schematic diagram of the knock mechanism 10 in the non-writing state of the knock-type writing instrument 1. At this time, the inner cam 46 of the rotor 40 urged rearward by the spring 6 via the refill 5 is arranged in the first guide groove 21 between the outer cams 20. Therefore, in this state, the writing unit 4 is immersed in the barrel 3. Further, the locking projection 31 of the operation unit 30 is arranged in the first guide groove 21 or the second guide groove 24. The cam surface 32 and the cam receiving surface 43 are arranged out of phase with each other.

From the state of FIG. 6A, the operation unit 30 and the rotor 40 are advanced by performing a knock operation that presses the operation unit 30 against the urging force of the spring 6. At this time, the locking projection 31 of the operation unit 30 and the inner cam 46 of the rotor 40 move forward in the first guide groove 21. Further, the operation unit 30 and the rotor 40 receive a component force in the circumferential direction opposite to each other via the slopes of the cam surface 32 and the cam receiving surface 43, but the locking projection 31 and the outer cam 20 are the first. The movement in the circumferential direction is restricted by the contact with the side surface of the first protrusion 22 and the second protrusion 23.

When the operation unit 30 and the rotor 40 are further advanced, the rear end portion of the inner cam 46 exceeds the front end portion of the outer cam 20, that is, the first protrusion 22 in the front-rear direction (FIG. 6 (b)). At this time, the restriction on the movement of the rotor 40 in the circumferential direction by the outer cam 20 is released, and the cam surface 32 and the cam receiving surface 43 coincide with each other.

When the pressing of the operation unit 30 is released from the state where the cam surface 32 and the cam receiving surface 43 are in agreement, the operation unit 30 and the rotor 40 are retracted by the urging force of the spring 6. At this time, the rotor 40 receives a component force from the slope of the outer cam 20 and rotates around the central axis. That is, the inner cam 46 of the rotor 40 moves until the slope of the outer cam 20 comes into contact with the side surface of the front end portion of the second protrusion 23, and the rotation of the rotor 40 is stopped. As described above, since the width of the inner cam 46 in the circumferential direction is smaller than the width of the first guide groove 21 and larger than the width of the second guide groove 24, the inner cam 46 is inside the second guide groove 24. Cannot enter. Therefore, the inner cam 46 is engaged with the front end surface of the first protrusion 22, and the retreat of the rotor 40 is restricted (FIG. 6 (c)). As a result, the writing portion 4 of the refill 5 arranged in front of the rotor 40 protrudes from the barrel 3, and the knock-type writing instrument 1 is in the writing state.

FIG. 7 is a schematic diagram of a knock mechanism 10 showing switching from a writing state to a non-writing state of the knock-type writing instrument 1 of FIG. 1. FIG. 7 shows the positional relationship between the outer cam 20, the operation unit 30, and the rotor 40 in the same manner as in FIG.

FIG. 7 (a) is a schematic diagram of the knock mechanism 10 in the writing state of the knock-type writing instrument 1, and is the same schematic diagram as FIG. 6 (c). From the state of FIG. 7A, the operation unit 30 and the rotor 40 are advanced by performing a knock operation that presses the operation unit 30 against the urging force of the spring 6. At this time, the locking projection 31 of the operation unit 30 and the inner cam 46 of the rotor 40 move forward in the first guide groove 21. Further, the operation unit 30 and the rotor 40 receive a component force in the circumferential direction opposite to each other via the slopes of the cam surface 32 and the cam receiving surface 43, but the locking projection 31 and the outer cam 20 are the first. The movement in the circumferential direction is restricted by the contact with the side surface of the first protrusion 22 and the second protrusion 23.

When the operation unit 30 and the rotor 40 are further advanced, the rear end portion of the inner cam 46 exceeds the front end portion of the outer cam 20, that is, the second protrusion 23 in the front-rear direction (FIG. 7 (b)). At this time, the restriction on the movement of the rotor 40 in the circumferential direction by the outer cam 20 is released, and the cam surface 32 and the cam receiving surface 43 coincide with each other.

When the pressing of the operation unit 30 is released from the state where the cam surface 32 and the cam receiving surface 43 are in agreement, the operation unit 30 and the rotor 40 are retracted by the urging force of the spring 6. At this time, the rotor 40 receives a component force from the slope of the outer cam 20 and rotates around the central axis. That is, since the inner cam 46 of the rotor 40 enters the first guide groove 21 from the slope of the outer cam 20 and moves backward, the operation unit 30 and the rotor 40 retract. The retreat of the operation unit 30 and the rotor 40 is regulated by the locking projection 31 of the operation unit 30 being engaged with the regulation surface 25 provided at the rear ends of the first guide groove 21 and the second guide groove 24. (Fig. 7 (c)). As a result, the writing portion 4 of the refill 5 arranged in front of the rotor 40 is immersed in the shaft cylinder 3, and the knock-type writing instrument 1 is in a non-writing state.

As described above with reference to FIG. 15, in the outer cam 131 of the conventional knock mechanism 100 as described in Patent Document 1, the third protrusion 135 arranged in the center is the locking protrusion of the operation portion 140. It is a second guide groove in which 141 is arranged. At the same time, as shown in FIG. 15D, the third protrusion 135 functions as a locking portion that locks the rotor 150 with the inner cam 156 so that the rotor 150 does not retract in the writing state. Therefore, the outer cam 131 needs to have a certain thickness in two stages so as to function as a locking portion as well.

On the other hand, the knock mechanism 10 of the knock type writing tool 1 described above does not have a configuration corresponding to the third protrusion 135 in the conventional knock mechanism 100, but instead has an internal structure by narrowing the width of the second guide groove 24. The first protrusion 22 functions as a locking portion that prevents the cam 46 from entering and locks the rotor 40 with the inner cam 46 so that the rotor 40 does not retract in the writing state. Therefore, the outer cam 20 only needs to have the thickness of the first protrusion 22 and the second protrusion 23 as a whole.

As a result, the outer cam 20 can be made thinner than the outer cam 131 in the conventional knock mechanism 100, and the inner diameter of the outer cam 20 portion can be made larger when considering a shaft cylinder having the same inner diameter. .. Therefore, in the shaft cylinder 3 of the knock-type writing tool 1, the outer diameter of the operation unit 30 that moves in the radial direction of the outer cam 20 in the front-rear direction can be made larger, and various requirements for design or design can be met. Can be done.

The cover member 50 will be described with reference to FIG. A fitting portion 51 projecting forward is provided on the inner rear end surface of the cover member 50. The fitting portion 51 is inserted into the fitting hole 35 of the operation portion 30 when the cover member 50 is fitted to the operation portion 30. The fitting portion 51 has, for example, a cylindrical shape, and a second locking portion 52 that protrudes outward with respect to the central axis is provided on the outer surface of the front end portion of the fitting portion 51. The front end portion of the fitting portion 51 can be bent inward in the radial direction, for example, by providing a plurality of slits extending rearward from the front end portion. When the fitting portion 51 of the cover member 50 is inserted into the fitting hole 35 of the operation portion 30, the second locking portion 52 of the fitting portion 51 of the cover member 50 is the first of the fitting holes 35 of the operation portion 30. By overcoming the locking portion 36, the operating portion 30 and the cover member 50 are snap-fitted. The first locking portion 36 and the second locking portion 52 can be locked to each other in a state where the cover member 50 is fitted to the operating portion 30. In other words, the first locking portion 36 and the second locking portion 52 can be arbitrarily configured as long as the first locking portion 36 and the second locking portion 52 can be locked to each other.

A regulation portion 53 is provided on the inner surface of the rear end portion of the cover member 50. When the operation unit 30 and the cover member 50 are fitted, the rear end portion of the operation unit 30 is locked to the regulation unit 53, so that the entry of the operation unit 30 in the cover member 50 is restricted. An annular or arcuate vent hole 54 is provided at the rear end of the cover member 50. By providing the ventilation hole 54, even if the cover member 50 is accidentally swallowed by an infant or the like, safety can be ensured without blocking the airway.

When the operation unit 30 and the cover member 50 are fitted to each other, the inner surface of the cover member 50 is in close contact with or close to the outer surface of the operation unit 30 as a whole. In other words, the operation unit 30 and the cover member 50 are formed so that the inner surface of the cover member 50 is in close contact with or close to the outer surface of the operation unit 30 as a whole. Therefore, the operation unit 30 can be formed thicker. Since the fitting portion 51 of the cover member 50 is inserted into the fitting hole 35 of the operation portion 30, the rear end portion of the operation portion 30 is in a state of being sandwiched by the inner surface of the cover member 50 and the fitting portion 51. Therefore, a stronger fitting can be realized.

Further, in order to fit into the fitting portion 51 provided on the inner rear end surface of the cover member 50, it is necessary to insert the operation portion 30 deeply into the cover member 50. Therefore, for example, by making the cover member 50 transparent or translucent, or by providing a window portion or a slit on the side surface of the cover member 50, the operation unit 30 arranged inside over substantially the entire length of the cover member 50 can be visually recognized. It can be possible. Thereby, for example, by making the writing color of the refill 5 the same as the color of the operation unit 30, the user can easily recognize the writing color. Further, when the product is displayed at the store or when the product is purchased at the store, the writing color can be easily recognized and specified.

According to the operation unit 30 and the cover member 50 described above, the knock-type writing tool 1 having a knock mechanism capable of increasing the variation of the fitting structure and meeting various design or design requirements is provided. Can be done.

FIG. 8 is a vertical cross-sectional view of the knock-type writing tool 11 according to the second embodiment of the present invention, and FIG. 9 is a vertical cross-sectional view of the rear end portion of the knock-type writing tool 11 of FIG. The knock-type writing tool 1 according to the first embodiment and the knock-type writing tool 11 according to the second embodiment differ greatly in the shape and configuration of the knock mechanism.

The knock-type writing tool 11 includes a shaft cylinder 3 formed in a cylindrical shape and having a mouthpiece member 2, a refill 5 which is a cursive body arranged in the shaft cylinder 3 and having a writing portion 4 at one end, and a refill 5. It has a spring 6 for urging rearward and a knock mechanism 60 arranged at the rear end of the barrel 3. The knock mechanism 60 includes an outer cam 70, an operation unit 80, a rotor 90, and a cover member 50. The mouthpiece member 2 arranged at the front end portion of the shaft cylinder 3 is formed in a tapered shape toward the front, and a through hole for projecting the writing portion 4 of the refill 5 is formed.

FIG. 10 is a vertical cross-sectional view of the rear end portion of the barrel 3 of the knock-type writing tool 11 of FIG. In FIG. 10, the lower part is the front of the knock-type writing tool 11. On the inner surface of the rear end portion of the barrel 3, four outer cams 70 forming a part of the knock mechanism 60 are provided at equal intervals in the circumferential direction. The adjacent outer cams 70 define four first guide grooves 71 extending in the front-rear direction. Each of the outer cams 70 includes a first protrusion 72, a second protrusion 73, and a third protrusion 74 that extend in the front-rear direction and are continuously arranged in the circumferential direction. The third protrusion 74 arranged in the middle has a thinner radial thickness than the first protrusion 72 and the second protrusion 73. Therefore, a second guide groove 75 extending in the front-rear direction is formed between the first protrusion 72 and the second protrusion 73. The width of the first protrusion 72, the width of the second protrusion 73, the width of the third protrusion 74, and the width of the first guide groove 71 in the circumferential direction are formed to be equal to each other. Therefore, the width of the first guide groove 71 and the width of the second guide groove 75 are equal to each other.

A wedge-shaped locked portion 76 projecting into the second guide groove 75 is provided on the side surface of the first protrusion 72 in the circumferential direction, particularly on the side surface near the rear end portion. Similarly, a protrusion-shaped locked portion 76 projecting into the first guide groove 71 is provided on the side surface of the second protrusion 73 in the circumferential direction, particularly on the side surface near the rear end portion. The locked portion 76 protrudes into the first guide groove 71 from the side surface on the opposite side in the circumferential direction of the first protrusion 72, and is second from the side surface on the opposite side in the circumferential direction of the second protrusion 73. It may be made to protrude into the guide groove 75. That is, the locked portion 76 is a convex portion that protrudes in the same direction in the circumferential direction from the side surfaces of the first protrusion 72 and the second protrusion 73.

The locked portion 76 has the same radial thickness as the first protrusion 72 and the second protrusion 73. The rear end surface of the locked portion 76 is flush with the rear end surfaces of the first protrusion 72 and the second protrusion 73, which are planes perpendicular to the central axis of the barrel 3. Since the locked portion 76 has a wedge shape, the locked portion 76 facing the inside of the first guide groove 71 and the inside of the second guide groove 75 with respect to the surface perpendicular to the central axis of the barrel 3. It has a locked slope 77 inclined in the circumferential direction. The locked slope 77 of the locked portion 76 is the same as the restricted surface 25 in the knock-type writing tool 1 according to the first embodiment in that the locked slope 77 of the locked portion 76 is locked with the locking projection 81 of the operating portion 80, as will be described later. Has the function of. The rear end surface of the outer cam 70 constitutes a contact surface 78 to which the front end surface of the cover member 50 can abut.

FIG. 11 is a perspective view of the operation unit 80 and the rotor 90 of the knock-type writing tool 11 of FIG. In FIG. 11, the lower part is the front of the knock-type writing tool 11.

The operation unit 80 is a cylindrical member formed in a loosely tapered shape toward the rear. Eight locking projections 81 are provided on the outer peripheral surface of the front end portion of the operation unit 80 at equal intervals in the circumferential direction. The locking projection 81 has an elongated protruding leg 87 extending in the axial direction, and a head 88 provided at the front end of the leg 87. Each of the locking protrusions 81 is located in the first guide groove 71 between the adjacent outer cams 70 or on the second protrusion 73, that is, between the first protrusion 72 and the second protrusion 73. 2 Arranged in the guide groove 75. Further, each of the locking projections 81 is configured to move in the front-rear direction in the first guide groove 71 or in the second guide groove 75 by a knock operation.

A cam surface 82 is formed on the front end surface of the operation unit 80. Specifically, the front end surface of the locking projection 81, that is, the front end surface of the head 88 constitutes a part of the cam surface 82. The cam surface 82 has eight peaks 83 and valleys 84. A circular fitting hole 85 into which the fitting portion 51 of the cover member 50 is inserted is provided at the rear end portion of the operation portion 80. A first locking portion 86 projecting inward in the radial direction is provided on the inner surface in the vicinity of the opening of the fitting hole 85.

The rotor 90 includes a small diameter portion 91 inserted inside from the front end portion of the operation portion 80 and used for alignment, and a large diameter portion 92 arranged in front of the small diameter portion 91. The large diameter portion 92 has a larger diameter than the small diameter portion 91. A cam receiving surface 93 that cooperates with the cam surface 82 of the operating unit 80 is formed on the rear end surface of the large diameter portion 92. The cam receiving surface 93 has four peaks 94 and valleys 05. On the outer peripheral surface of the large diameter portion 92, four inner cams 96, which are protrusions extending in the front-rear direction, are provided at equal intervals in the circumferential direction.

Since the fitting structure of the operation unit 80 and the cover member 50 and the effect produced by the fitting structure are as described in the first embodiment, the description thereof will be omitted.

FIG. 12 is a schematic diagram of the knock mechanism 60 showing the switching from the non-writing state to the writing state of the knock-type writing instrument 11 of FIG. That is, FIG. 12 is a schematic view showing the positional relationship between the outer cam 70, the operation unit 80, and the rotor 90, and is a locking projection of the operation unit 80 with respect to the outer cam 70 expanded in the circumferential direction. It shows the position of the inner cam 96 of 81 and the rotor 90. In the figure, the lower part is the front of the knock-type writing tool 11, and the upper part is the rear of the knock-type writing tool 11. The rotor 90 is given a rotational force by the cooperation of the cam surface 82 of the operation unit 80 and the cam receiving surface 93 of the rotor 90, and rotates around the central axis. Therefore, the rotor 90 moves from right to left in the figure for each knock operation in FIG. 12.

FIG. 12A is a schematic diagram of the knock mechanism 60 in the non-writing state of the knock-type writing instrument 11. At this time, the inner cam 96 of the rotor 90 urged rearward by the spring 6 via the refill 5 is arranged in the first guide groove 71 between the outer cams 70. Therefore, in this state, the writing unit 4 is immersed in the barrel 3. The cam surface 82 and the cam receiving surface 93 are arranged out of phase with each other.

The locking projection 81 of the operation unit 80 is arranged in the first guide groove 71 or the second guide groove 75. Specifically, the leg portion 87 of the locking protrusion 81 is always between the locked portion 76 and the first protrusion 72 of the outer cam 70 or between the locked portion 76 and the second protrusion 73 during the knock operation. Placed in. Further, the rear end portion of the leg portion 87 of the locking projection portion 81 always protrudes rearward from the outer cam 70 during the knock operation.

From the state of FIG. 12A, the operation unit 80 and the rotor 90 are advanced by performing a knock operation that presses the operation unit 80 against the urging force of the spring 6. At this time, the locking projection 81 of the operation unit 80 and the inner cam 96 of the rotor 90 move forward in the first guide groove 71. Further, the operation unit 80 and the rotor 90 receive a component force in the circumferential direction opposite to each other via the slopes of the cam surface 82 and the cam receiving surface 93, but the locking projection 81 and the outer cam 70 are the first. The movement in the circumferential direction is restricted by the contact with the side surfaces of the first protrusion 72 and the second protrusion 73.

When the operation unit 80 and the rotor 90 are further advanced, the rear end portion of the inner cam 96 exceeds the front end portion of the outer cam 70, that is, the first protrusion 72 in the front-rear direction (FIG. 12 (b)). At this time, the restriction on the movement of the rotor 90 in the circumferential direction by the outer cam 70 is released, and the cam surface 82 and the cam receiving surface 93 coincide with each other.

When the pressing of the operation unit 80 is released from the state where the cam surface 82 and the cam receiving surface 93 are in agreement, the operation unit 80 and the rotor 90 are retracted by the urging force of the spring 6. At this time, the rotor 90 receives a component force from the slope of the outer cam 70 and rotates around the central axis. That is, the inner cam 96 of the rotor 90 moves on the slope of the outer cam 70 until it comes into contact with the side surface of the front end portion of the second protrusion 73, and the rotation of the rotor 90 stops. At this time, the inner cam 96 is engaged with the front end surface of the third protrusion 74, and the retreat of the rotor 90 is restricted (FIG. 12 (c)). As a result, the writing portion 4 of the refill 5 arranged in front of the rotor 90 protrudes from the barrel 3, and the knock-type writing instrument 11 is in the writing state.

FIG. 13 is a schematic diagram of a knock mechanism 60 showing switching from a writing state to a non-writing state of the knock-type writing instrument 11 of FIG. FIG. 13 shows the positional relationship between the outer cam 70, the operation unit 80, and the rotor 90 in the same manner as in FIG.

13 (a) is a schematic diagram of the knock mechanism 60 in the writing state of the knock-type writing instrument 11, and is the same schematic diagram as FIG. 12 (c). From the state of FIG. 13A, the operation unit 80 and the rotor 90 are advanced by performing a knock operation that presses the operation unit 80 against the urging force of the spring 6. At this time, the locking projection 81 of the operation unit 80 and the inner cam 96 of the rotor 90 move forward in the first guide groove 71. Further, the operation unit 80 and the rotor 90 receive a component force in the circumferential direction opposite to each other via the slopes of the cam surface 82 and the cam receiving surface 93, but the first protrusion 72 and the first protrusion 72 of the outer cam 70. 2 The side surface of the protrusion 73 restricts the movement in the circumferential direction.

When the operation unit 80 and the rotor 90 are further advanced, the rear end portion of the inner cam 96 exceeds the front end portion of the outer cam 70, that is, the second protrusion 73 in the front-rear direction (FIG. 13 (b)). At this time, the restriction on the movement of the rotor 90 in the circumferential direction by the outer cam 70 is released, and the cam surface 82 and the cam receiving surface 93 coincide with each other.

When the pressing of the operation unit 80 is released from the state where the cam surface 82 and the cam receiving surface 93 are in agreement, the operation unit 80 and the rotor 90 are retracted by the urging force of the spring 6. At this time, the rotor 90 receives a component force from the slope of the outer cam 70 and rotates around the central axis. That is, since the inner cam 96 of the rotor 90 enters the first guide groove 71 from the slope of the outer cam 70 and moves backward, the operation unit 80 and the rotor 90 retract. To retract the operation unit 80 and the rotor 90, the locking projection 81 of the operation unit 80 is locked with the locked portion 76 provided at the rear end of the first guide groove 71 or the second guide groove 75. Regulated by (Fig. 13 (c)). Specifically, the head 88 of the locking projection 81 is locked with the locked slope 77 of the locked portion 76, so that the retracting of the operating portion 80 and the rotor 90 is restricted. The head 88 has a shape complementary to the locked slope 77 of the locked portion 76. In other words, the convex shape of the locked portion 76 is a shape complementary to a part of the locking protrusion 81. As a result, the writing portion 4 of the refill 5 arranged in front of the rotor 90 is immersed in the shaft cylinder 3, and the knock-type writing instrument 11 is in a non-writing state.

According to the knock mechanism 60, when the stroke required for the knock operation is the same, the total length of the outer cam in the axial direction can be made shorter than that of the knock mechanism 100 described in Patent Document 1. This will be described with reference to FIGS. 12 and 15.

First, referring to FIG. 15A for the knock mechanism 100 described in Patent Document 1, the total length of the outer cam 131 is L1. The front end is the tip of the first protrusion 133 or the second protrusion 134, and the rear end is a surface corresponding to the contact surface 26 with the cover member 50 in the knock-type writing tool 1 according to the first embodiment. The stroke L0 required for the knock operation is equal to the distance between the tip of the inner cam 156 and the tip of the first protrusion 133 or the second protrusion 134. In the knock mechanism 100, the rotation of the operation unit 140 around the central axis is restricted by the locking projections 141 that are short and small in the axial direction. Therefore, as shown in FIG. 15B, even when the operation portion 140 is advanced by the knock operation, the locking projection portion 141 is prevented from being separated from the first guide groove 132 or the second guide groove. It is provided behind the surface 142. Therefore, in order to shorten the total length of the outer cam 131, it is necessary to reduce the difference between L1 and L0.

Next, referring to FIG. 12A for the knock mechanism 60 in the second embodiment, the total length of the outer cam 70 is L5. As described above, the stroke L0 required for the knock operation is equal to the distance between the tip of the inner cam 96 and the tip of the first protrusion 72 or the second protrusion 73. In the knock mechanism 60, the rotation of the operating portion 80 around the central axis is restricted by the locking projection 81 elongated in the axial direction. That is, the leg portion 87 of the locking protrusion 81 is always between the locked portion 76 and the first protrusion 72 of the outer cam 70, or between the locked portion 76 and the second protrusion 73 during the knock operation. By arranging in, the rotation of the operation unit 80 around the central axis is restricted. As a result, the head 88 of the locking projection 81 can be arranged at the front end of the operating portion 80 near the cam surface 82.

Here, when the distance L1 of the outer cam 131 in Patent Document 1 and the distance L5 of the outer cam 70 in the second embodiment are compared, the rear end portion and the outer portion of the locking projection 141 in FIG. 15A are generally compared. The distance L5 is shorter than the distance L1 by the distance L2 between the rear end surface of the cam 131 and the distance L3 between the front end portion of the locking projection 141 and the mountain portion 143 of the cam surface 142. .. That is, the distance in FIG. 12 (a) corresponding to the distance L2 in FIG. 15 (a) is the distance between the rear end portion of the locking projection 81, that is, the rear end portion of the head 88 and the contact surface 78. However, since the locked portion 76 has a wedge shape, it is substantially zero. Further, in the distance in FIG. 12 (a) corresponding to the distance L3 in FIG. 15 (a), the front end surface of the locking projection 81, that is, the front end surface of the head 88 constitutes a part of the cam surface 82. Therefore, it is virtually zero. Therefore, according to the knock mechanism 60, the total length of the outer cam can be shortened by the distance L2 and the distance L3 in FIG. 15A as compared with the knock mechanism 100 described in Patent Document 1.

By shortening the total length of the outer cam without changing the stroke of the knock operation, the entire knock mechanism can be shortened, and as a result, the total length of the knock-type writing instrument can be shortened. Therefore, it is possible to provide a knock-type writing tool having a knock mechanism capable of meeting various requirements for design and design.

In the second embodiment, the locked portion 76 has a locked slope 77. The head 88 of the locking projection 81 that locks with the locked slope 77 also has a shape complementary to the locked slope 77, that is, a slope. Therefore, when assembling the knock-type writing tool 11, when the operation unit 80 is inserted from the front of the barrel 3, it can be smoothly inserted and the assembleability is improved. The locked portion 76 has an arbitrary position and shape (for example, a circular shape) on the side surface of the first protrusion 72 and the second protrusion 73 as long as it projects into the first guide groove 71 and the second guide groove 75. It can be provided by a protrusion). On the other hand, the head 88 of the locking projection 81 can be arbitrarily configured as long as it can be locked with the locked portion 76. Further, the leg portion 87 of the locking protrusion 81 is always between the locked portion 76 and the first protrusion 72 of the outer cam 70, or between the locked portion 76 and the second protrusion 73 during the knock operation. By being arranged in, it can be arbitrarily configured as long as the rotation around the central axis of the operation unit 80 is restricted.

By the way, characters such as the ball diameter of a ballpoint pen may be attached to the outer rear end surface 55 of the cover member 50 by printing by pad printing or the like or by attaching a sticker or the like. The attached characters, etc. serve as a guide for aligning the orientation of the knock-type writing instruments so that they are arranged in an orderly manner when displaying products at the store. The shaft cylinder 3 has a clip 8 provided with a ball portion 7 (FIGS. 1 and 8). It is preferable to make the space between the barrel 3 and the ball portion 7 of the clip 8 narrower so that a thinner article, for example, a piece of paper can be sandwiched. It is preferable to provide the clip 8 so that the draft on the wide upper surface 9 (FIG. 3) at the time of molding is more flat, because it gives a aesthetic impression. It is preferable that the boundary portion between the mouth member 2 and the barrel 3 is formed continuously and smoothly so as not to be recognized by the user. The front end portion of the spring 6 may be fitted to the inner surface of the mouth member 2. In this case, even if the mouth member 2 is removed from the barrel 3 when the refill 5 is replaced, the spring 6 is prevented from falling off and being lost.

The refill 5 may be a cursive of other types such as a marking pen, a touch pen, and an eraser, in addition to the ballpoint pen. Further, a part or all of the operation unit or the cover member 50 may be used as an erasing unit for erasing the handwriting by the knock-type writing instrument.

The refill 5 may be a ballpoint pen containing a heat-discoloring ink. Here, the heat-discolorable ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), and changes to another color (second color) when the temperature is raised to a predetermined temperature (for example, 60 ° C.). This refers to an ink having the property of returning to the original color (first color) when cooled to a predetermined temperature (for example, −5 ° C.). In a heat-changing writing instrument using heat-changing ink, making the second color colorless and raising the temperature of the drawn line written in the first color (for example, red) to make it colorless is, here, "erasing". And. Therefore, the drawn line is rubbed against the written surface or the like on which the drawn line is written by the friction member which is the erasing portion to generate frictional heat, whereby the drawn line is changed to colorless, that is, erased. As a matter of course, the second color may be colored other than colorless.

1 Knock type writing tool 10 Knock mechanism 20 External cam 21 1st guide groove 22 1st protrusion 23 2nd protrusion 24 2nd guide groove 30 Operation part 31 Locking protrusion 32 Cam surface 35 Fitting hole 40 Rotor 43 Cam Receiving surface 46 Inner cam 50 Cover member 51 Fitting part

Claims (6)

A knock-type writing tool provided with an operation unit and a cover member covering the rear end portion of the operation unit.
A fitting hole is provided on the rear end surface of the operation portion, and a fitting portion is provided on the inner rear end surface of the cover member so as to project forward.
A knock-type writing tool, wherein the cover member is fitted to the operation portion by inserting the fitting portion into the fitting hole and fitting the fitting portion. A first locking portion is provided on the inner surface of the fitting hole, a second locking portion is provided on the outer surface of the fitting portion, and the first locking portion and the second locking portion can be locked to each other. The knock-type writing tool according to claim 1. The knock-type writing tool according to claim 1 or 2, wherein the cover member is formed to be transparent or translucent. The third aspect of the present invention, wherein the control protrusion is provided on the inner surface of the cover member, and the rear end portion of the operation portion is locked to the regulation protrusion, whereby the entry of the operation portion in the cover member is restricted. The knock-type writing tool described in any one of the items. The knock-type writing instrument according to any one of claims 1 to 4, wherein the operation unit has an erasing unit capable of erasing the handwriting of the knock-type writing instrument. 5. The knock-type writing instrument is a knock-type writing instrument having a heat-discoloring ink, and is characterized in that the handwriting by the heat-discoloring ink can be thermally discolored by the frictional heat generated when the writing instrument is scratched by the erasing portion. Knock-type writing instrument described in.

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