CN108621641B - Press type writing tool - Google Patents
Press type writing tool Download PDFInfo
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- CN108621641B CN108621641B CN201810206737.7A CN201810206737A CN108621641B CN 108621641 B CN108621641 B CN 108621641B CN 201810206737 A CN201810206737 A CN 201810206737A CN 108621641 B CN108621641 B CN 108621641B
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- pressing
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- 230000002093 peripheral effect Effects 0.000 claims description 28
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
- B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
- B43K24/08—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by push-buttons
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- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
The invention provides a pressing type writing tool, which aims to prevent a pressing body from shaking in the front-back direction. The push-type writing instrument includes: a shaft tube (10); a pressing body (20) which is supported in the shaft tube (10) so as to move back and forth in the 1 st range (W1) relative to the shaft tube (10) and has the rear end side exposed outside the shaft tube; a rotor (30) which is pushed by the pressing body (20) to move forward; a cam mechanism (A) for rotating and locking the rotor (30) when the rotor has advanced by a cam slope (21 a); a center core (40) which is connected to the front end side of the rotor (30) and causes the writing part (41) to protrude from the front end of the shaft tube by the advance of the rotor (30); and a1 st biasing member (51) for biasing the rotor (30) rearward relative to the barrel (10), the pressing member (20) being connected to be capable of being slightly moved forward and backward relative to the rotor (30) within a 2 nd range (W2) smaller than the 1 st range (W1), the pressing writing instrument being provided with a 2 nd biasing member (52) for biasing the pressing member (20) rearward relative to the barrel (10).
Description
Technical Field
The present invention relates to a knock-type writing instrument in which a rotor is advanced as a knock body is pushed forward, a writing portion at a front end of a core connected to the rotor is projected from a front end of a shaft, and the rotor is rotated and locked by a cam mechanism.
Background
Conventionally, as described in fig. 3 and 4 of patent document 1, for example, there is a knock-type writing instrument including: a cylindrical intermediate member integrally connected to the shaft cylinder; a pushing body (operation part) supported in the intermediate member so as to be capable of advancing and retreating and restricted from moving backward, and having a rear end protruding backward from the intermediate member; a rotor which is pushed by the pushing body when the rotor has advanced, rotated by a cam mechanism, and locked; a center core (alternate core) connected to a front side of the rotor and having a writing section projected from a front end of the shaft by the forward movement of the rotor; and a biasing member that biases the rotor rearward with respect to the intermediate member.
Patent document 1: japanese patent laid-open publication No. 2004-209881
Patent document 2: japanese patent laid-open publication No. 2003-305990
However, according to the conventional technique described in patent document 1, in a state where the writing section is projected from the front end of the cylinder and the rotor is locked, the pressing body (operation section) is in a state of being slidable in the front-rear direction between a push-in position where it is pushed deeply into the cylinder and a projecting position where it projects long backward from the cylinder.
Therefore, it is impossible to visually determine whether or not the writing section is protruded from the front and rear positions of the pressing body with respect to the shaft tube.
Further, since the pressing body can slide freely forward and backward in the projected state of the writing section, the pressing body may shake forward and backward due to writing operation for quickly changing the writing direction, operation for gripping the barrel, and the like, thereby generating sound and vibration.
Further, when the pressing body is stationary at the protruding position by friction with the shaft tube or the like, and writing is performed in this state, the center of gravity of the entire writing instrument is located behind the pressing body, and thus a good writing feeling may not be obtained.
Therefore, for example, in the invention described in patent document 2, a locking step portion is provided in a fixed cam integrated with the pressing body, and the amount of rearward movement of the pressing body is reduced by bringing the locking step portion into contact with a locking step portion provided in a rotor (rotating cam).
However, in this conventional technique, the amount of movement of the pressing body with respect to the rotor is small, but the pressing body may move back and forth, and as in the former conventional technique, sound and vibration may be generated, which may result in a reduction in writing feeling, and the like.
Disclosure of Invention
In view of such problems, the present invention has the following configurations.
A knock-type writing instrument comprising: a shaft cylinder; a pressing body supported in the shaft tube so as to move forward and backward in the 1 st range with respect to the shaft tube, and having a rear end side exposed outside the shaft tube; a rotor which is pushed by the pressing body to advance; a cam mechanism for rotating and locking the rotor when the rotor has advanced through a cam slope; a center core connected to a front end side of the rotor and having a writing section projected from a front end of the shaft by the forward movement of the rotor; and a1 st biasing member for biasing the rotor rearward relative to the barrel, wherein the pressing body is connected to the rotor so as to be capable of fine movement forward and backward in a 2 nd range smaller than the 1 st range, and the knock-type writing instrument is provided with a 2 nd biasing member for biasing the pressing body rearward relative to the barrel.
Effects of the invention
According to the present invention, it is possible to visually determine whether or not the writing section is in the protruding state based on the position of the pressing body with respect to the shaft tube, and to prevent the pressing body from being moved in the front-rear direction.
Drawings
Fig. 1 is a longitudinal sectional view showing a knock-type writing instrument 1 according to an embodiment of the present invention.
Fig. 2 is a vertical cross-sectional view of the knock-type writing instrument according to the present invention, in which fig. 2(a) shows a state in which a knock body is pushed, and fig. 2(b) shows a state in which the pushing force on the knock body is released.
Fig. 3 is a developed view of the main part of the knock-type writing instrument according to the present invention, and fig. 3(a) to 3(d) sequentially show the operation of the cam mechanism.
Fig. 4 is a view showing a range (2 nd range) in which the slide cylinder of the pressing body advances and retreats with respect to the rotor in relation to embodiment 1, fig. 4(a) shows a state in which the slide cylinder is located at the front end of the range, and fig. 4(b) shows a state in which the slide shaft is located at the rear end of the range.
Fig. 5 is a vertical cross-sectional view showing embodiment 2 of the knock-type writing instrument according to the present invention.
Fig. 6 is a vertical cross-sectional view of the knock-type writing instrument shown in fig. 5, in which fig. 6(a) shows a state in which the knock body is pushed, and fig. 6(b) shows a state in which the pushing force on the knock body is released.
Fig. 7 is a view showing a range (2 nd range) in which the pressing body moves forward and backward with respect to the rotor in embodiment 2, fig. 7(a) shows a state in which the pressing body is located at the front end of the range, and fig. 7(b) shows a state in which the pressing body is located at the rear end of the range.
In the figure: 1. 2-press writing instrument, 10: shaft tube, 20-pressing body, 21 a-cam bevel, 21 b-convex part, 30-rotor, 35-concave part, 40-central core, 41-writing part, 51-1 st forcing part, 52-2 nd forcing part, A-cam mechanism, W1-1 st range, W2-2 nd range, X-front and back width.
Detailed Description
The present embodiment discloses the following features.
The 1 st feature is provided with: a shaft cylinder; a pressing body supported in the shaft tube so as to move forward and backward in the 1 st range with respect to the shaft tube, and having a rear end side exposed outside the shaft tube; a rotor which is pushed by the pressing body to advance; a cam mechanism for rotating and locking the rotor when the rotor has advanced through a cam slope; a center core connected to a front end side of the rotor and having a writing section projected from a front end of the shaft by the forward movement of the rotor; and a1 st biasing member for biasing the rotor rearward relative to the barrel, wherein the pressing body is connected to the rotor so as to be capable of fine movement forward and backward in a 2 nd range smaller than the 1 st range, and the knock-type writing instrument is provided with a 2 nd biasing member for biasing the pressing body rearward relative to the barrel. (refer to fig. 1 to 7).
Here, the 1 st force application member includes: a mode in which the front end is clamped to the shaft cylinder and the rear end is clamped to the rotor, so that the rotor is directly forced backward relative to the shaft cylinder; and a method (refer to fig. 1 and 5) in which the front end is engaged with the shaft tube and the rear end is engaged with another member (e.g., a substitute core) connected to the rotor, thereby indirectly biasing the rotor rearward with respect to the shaft tube.
The 2 nd force application member includes, for example: a mode (refer to fig. 1) in which a front end is engaged with the shaft tube and a rear end is engaged with the pressing body, so that the pressing body is directly forced backward relative to the shaft tube; and a mode (refer to fig. 5) in which the front end is locked to another member (for example, the rotor, the refill, or the like) engaged with the shaft tube, and the rear end is locked to the pressing body, thereby indirectly biasing the pressing body rearward with respect to the shaft tube.
A second feature of the present invention is that the rear portion side of the rotor is formed in a shaft shape, the pressing member is formed in a cylindrical shape fitted to the rear portion side of the rotor, a concave portion extending in the front-rear direction is provided in one of the rotor and the pressing member, a convex portion movable in the front-rear direction in the concave portion is provided in the other of the rotor and the pressing member, and the front-rear width of the concave portion is set so as to include the range 2 (see fig. 4).
As a 3 rd feature, the 2 nd biasing member biases the pressing member rearward by locking a front end side thereof to the shaft tube and locking a rear end side thereof to the pressing member (see fig. 1 to 2).
As a feature of claim 4, the 2 nd urging member is a compression coil spring that is fitted to the pressing body in a ring shape, and has a front end side that is locked to the shaft tube and a rear end side that is locked to the pressing body, and the recessed portion and the raised portion are arranged on a radially inner side thereof (see fig. 1 to 2).
As the 5 th feature, the 2 nd biasing member biases the pressing body rearward by locking the front end side thereof to the rotor and locking the rear end side thereof to the pressing body (see fig. 5 to 6).
As a feature of feature 6, the 2 nd urging member is a compression coil spring, and is fitted in a ring shape between an inner peripheral surface of the pressing body and an outer peripheral surface of the rotor by locking a front end side thereof to the rotor and locking a rear end side thereof to the pressing body (see fig. 5 to 6).
As a feature of claim 7, the cam mechanism includes a cam slope on a tip side of the pressing body, the cam slope moving the rotor in the forward and backward direction while sliding and rotating the rotor when the rotor has advanced, and the 2 nd range is set to be longer than a forward and backward movement amount generated by the cam slope of the pressing body (see fig. 3).
Next, specific embodiments having the above-described features will be described in detail with reference to the drawings.
In the present specification, the axial direction of the shaft tube means a direction in which the center line of the shaft tube extends. The term "front" refers to a direction in which the writing section protrudes from one side of the axial direction of the shaft tube. The term "rear" refers to the side opposite to the one side. The term "axial direction" means a direction perpendicular to the axial direction of the shaft. The "radially outward direction of the shaft tube" means a direction away from the center of the shaft tube in the radial direction of the shaft tube. The "radially inner direction of the shaft cylinder" means a direction approaching the center of the shaft cylinder in the radial direction of the shaft cylinder.
< embodiment 1 >
Fig. 1 shows an example of a knock-type writing instrument according to the present invention.
The knock-type writing instrument 1 includes: a shaft tube 10; a pressing body 20 supported in the shaft tube 10 and having a rear end exposed outside the shaft tube; a rotor 30 which is pushed by the pushing body 20 when it has advanced, and which retreats and is locked while rotating by the cam mechanism a; a center core 40 connected to the front end side of the rotor 30 and having a writing part 41 protruding from the front end of the shaft tube by the forward movement of the rotor 30; a1 st biasing member 51 for biasing the phase rotor 30 rearward relative to the shaft tube 10; and a 2 nd biasing member 52 for biasing the pressing body 20 rearward.
The shaft tube 10 is a long substantially cylindrical member having a tapered front opening portion on the front end side, and may be formed of a single member or a plurality of substantially cylindrical members connected to each other as shown in fig. 1. A grip portion made of an elastic material is annularly attached to the outer peripheral surface of the front end side of the shaft tube 10 as necessary.
Further, a slide groove 11, a cam inclined surface 12, a locking surface 18, and the like (see fig. 3) that constitute the cam mechanism a are provided on the inner peripheral surface of the rear end side of the shaft tube 10.
The slide grooves 11 are grooves continuously recessed in the front-rear direction in the inner peripheral surface of the reduced diameter portion formed on the rear end side of the shaft tube 10, and are provided in plurality at intervals in the circumferential direction.
The cam slope 12 is a plurality of slopes provided at intervals in the circumferential direction at the tip of a reduced diameter portion formed on the rear end side of the shaft tube 10. As illustrated in fig. 3, the cam inclined surfaces 12 are arranged in a zigzag shape, the adjacent two cam inclined surfaces 12 and 12 are connected by the engaging surface 18 in the front-rear direction, and circumferential ends of the adjacent two cam inclined surfaces 12 and 12 are connected to the front end of the chute 11.
Further, a projection 13 (see fig. 1) that projects annularly in the radial inner direction is provided on the inner peripheral surface of the shaft tube 10 on the rear side of the slide groove 11.
The protrusion 13 abuts on the rear end of a protrusion 21c of the pressing member 20 described later, and restricts the backward movement of the pressing member 20.
The pressing body 20 is supported to move forward and backward in the 1 st range W1 with respect to the shaft tube 10, and its rear end side protrudes rearward of the shaft tube.
As will be described in detail below, the push body 20 integrally includes a slide cylinder 21, a clip member 22 connected to a rear end side of the slide cylinder 21, and a closing member 23 for closing a fitting hole for connecting the slide cylinder 21 and the clip member 22.
Here, the 1 st range W1 is a range in which the pushing body 20 moves between an initial state (see the two-dot chain line in fig. 2 a) in which the writing portion 41 is housed in the barrel 10 and a state (see the solid line in fig. 2 a) in which the writing portion 41 protrudes from the distal end of the barrel 10 by a forward pushing force applied to the pushing body 20.
The slide cylinder 21 is a substantially cylindrical member, and is engaged so as to be able to advance and retreat with respect to the shaft cylinder 10 and be unable to rotate by fitting a protrusion 21c formed on the outer peripheral surface thereof into the slide groove 11 on the inner peripheral surface of the shaft cylinder 10.
The slide cylinder 21 has a plurality of V-shaped cam slopes 21a (see fig. 3) arranged in the circumferential direction on the front end surface thereof.
The slide cylinder 21 has a convex portion 21b on the inner peripheral surface (see fig. 1 and 2). The spool 21 is connected so as to be capable of fine movement forward and backward in the 2 nd range W2 by fitting the convex portion 21b into the concave portion 35 of the rotor 30, and the 2 nd range W2 is smaller than the 1 st range W1 and larger than the amount of movement M in the forward and backward direction (see fig. 3) generated by the cam slope 21a of the spool 21 (see fig. 4).
The clip member 22 is integrally constituted by: a cylindrical portion 22a slidable back and forth with respect to the shaft tube 10; and a clip main body portion 22b that protrudes radially outward from the outer peripheral surface of the tube portion 22a and extends forward.
The rear end side of the cylinder portion 22a is reduced in diameter, and a fitting hole 21a1 having a through shape is provided in the central portion thereof to be fitted to the rear end side of the slide cylinder 21.
The cylinder portion 22a is capable of moving forward and backward by fitting its front end side into the cylindrical hole 14 on the rear end side of the peripheral wall of the shaft tube 10.
The closing member 23 is formed in a plug shape that closes the fitting hole 21a1 of the tube portion 22 a.
As another example of the pressing body 20, the following can be provided: a mode in which a part or all of the slide cylinder 21, the clip member 22, and the closing member 23 are integrally molded in advance; and a mode in which the rear end side of the slide cylinder 21 is directly pushed.
The rotor 30 is integrally composed of a front half-side cylindrical portion 30a and a rear half-side shaft-like portion 30b having a smaller diameter than the cylindrical portion 30a, and is rotatably supported in the shaft tube 10 so as to be able to advance and retreat in a state where the shaft-like portion 30b is inserted into the slide tube 21.
When the rotor 30 is pushed by the pushing body 20 and advances by a predetermined amount, it is rotated by the cam mechanism a and locked, and when it is pushed again by the pushing body 20, the locked state is released (see fig. 3).
The cylindrical portion 30a is provided with the following portions: a protrusion 31 extending in the front-rear direction on the outer circumferential surface of the cylindrical portion 30a so as to be fitted into the slide groove 11 of the shaft tube 10 and guided in the front-rear direction; a cam slope 32 provided at the rear end of the protrusion 31 so as to be in sliding contact with the cam slope 21a of the pressing body 20 and the cam slope 12 of the shaft tube 10; and the like.
An annular recess 35 is formed on the outer peripheral surface of the shaft-like portion 30b so as to extend in the front-rear direction.
The front-rear width X of the recess 35 is set to include the 2 nd range W2 (refer to fig. 4).
The 2 nd range W2 is a range in which the spool 21 advances and retreats with respect to the rotor 30.
More specifically, the 2 nd range W2 is a range of relative positions of the spool 21 with respect to the rotor 30, and is a range between the lower positions: at a position where the advance of the slide cylinder 21 is restricted by the abutment of the cam slope 21a at the tip of the slide cylinder 21 with the rotor 30 (see fig. 4 (a)); and a position where the retraction of the slide cylinder 21 is restricted by the contact of the convex portion 21b of the slide cylinder 21 with the rear end of the concave portion 35 of the rotor 30 (see fig. 4 (b)).
The 2 nd range W2 is set to be longer than the amount of movement M in the front-rear direction by the cam slope 21a of the pressing body 20.
As shown in fig. 3, the moving amount M is the distance of the slide cylinder 21 in the axial direction of the shaft cylinder on the cam slope 21 a.
That is, in a preferred example of the present embodiment, the 2 nd range W2 is set to be longer than the movement amount M, so that the rotor 30 can smoothly rotate and advance and retreat with respect to the spool 21.
The inner peripheral surface of the shaft tube 10 on the rear end side, the slide tube 21, the rotor 30, and the like constitute a cam mechanism a that moves and locks the rotor 30 in the front-rear direction while rotating by the pushing operation of the pushing member 20 (see fig. 3).
The basic structure of the cam mechanism a can be applied to, for example, the structure disclosed in japanese patent application laid-open No. 2004-209881, but may be another structure that performs the same function.
In the example shown in the figure, the center core 40 is a refill for a ballpoint pen, and a writing part 41 as a ballpoint pen tip is connected to the tip of an ink tank 42 having a long cylindrical shape.
As another example of the core 40, a refill for a mechanical pencil, a refill constituting an input pen (stylus pen) for an electronic device, or the like can be used.
The core 40 is biased rearward by the 1 st biasing member 51, and the rear end side is received by the rotor 30.
The 1 st biasing member 51 is a compression coil spring, and its front end portion is locked to the step portion 15 in the shaft tube 10 and its rear end portion is locked to the step portion 42a on the outer peripheral surface of the ink tank 42, thereby indirectly biasing the rotor 30 rearward through the center 40.
As another example, the front end of the 1 st biasing member 51 may be locked to the rear side in the shaft tube 10, and the rear end of the 1 st biasing member 51 may be locked to the rotor 30, so that the rotor 30 may be directly biased rearward.
The 2 nd urging member 52 is a compression coil spring having a smaller urging force than the 1 st urging member 51. The 2 nd biasing member 52 is fitted in a ring shape on the outer periphery of the slide cylinder 21 by locking the front end side to the projection 13 on the rear end side of the shaft cylinder 10 and locking the rear end side to the step portion 22c in the push body 20.
The convex portion 21b of the slide cylinder 21 and the concave portion 35 of the rotor 30 are located on the radially inner side of the 2 nd biasing member 52.
The 2 nd biasing member 52 biases the pressing body 20 rearward with respect to the shaft tube 10.
Next, the characteristic operational effects of the knock-type writing instrument 1 configured as described above will be described in detail.
As shown in fig. 1, in the initial state in which the writing section 41 is accommodated in the shaft tube 10, the push body 20 is biased rearward by the 2 nd biasing member 52, and the rear end portion of the protrusion 21c of the slide tube 21 is locked to the rear end side protrusion 13 in the shaft tube 10.
When the pressing body 20 receives a pressing force from the outside and moves forward in the 1 st range W1, the cam slope 21a at the tip of the slide cylinder 21 pushes the cam slope 32 of the rotor 30 as shown in fig. 3 (a). Therefore, the rotor 30 moves the protrusion 31 along the slide groove 11 integrally with the slide cylinder 21, and the core 40 is also pressed by the rotor 30 to move forward.
As shown in fig. 3(b), when the projection 31 of the rotor 30 is pulled out from the front side of the slide groove 11 by the above-described advance, the cam slope 32 at the rear end of the projection 31 slides on the cam slope 21a at the front end of the slide cylinder 21, and the rotor 30 is rotated in one direction.
As shown in fig. 3(c), the cam slope 32 at the rear end of the protrusion 31 is locked between the valley portions of the adjacent cam slopes 21a, 21a at the front end of the slide tube 21.
When the pressing force on the pressing body 20 is removed, the rotor 30 is retreated by the biasing force of the 1 st biasing member 51, and the cam slope 32 at the rear end of the protrusion 31 abuts against the cam slope 12 on the shaft tube 10 side, slides on the cam slope 12, retreats while rotating in the one direction, and then abuts against the locking surface 18 (see fig. 3 (d)).
On the other hand, as shown in fig. 2(a) and 2(b), the core 40 is slightly retracted together with the rotor 30 and is stationary in a state where the writing portion 41 is projected from the front end of the barrel 10.
In this stationary state (see fig. 2(b)), the slide cylinder 21 is biased rearward by the 2 nd biasing member 52, and the convex portion 21b is locked to the rear end side in the concave portion 35.
Therefore, even if the pushing body 20 is pulled rearward by an external force, for example, the pushing body does not move rearward relative to the rotor 30.
Therefore, according to the knock-type writing instrument 1, whether or not the writing section 41 protrudes can be visually determined from the position of the knock body 20 in the front-rear direction with respect to the barrel 10.
Further, the 2 nd urging member 52 can suppress the rocking of the pressing body 20 in the front-rear direction, and further, the generation of sound and vibration due to the rocking of the pressing body 20 can be prevented.
In particular, according to the preferred embodiment shown in the drawings, the convex portion 21b and the concave portion 35 are disposed inside the 2 nd urging member 52, and therefore a compact structure with a short length in the front-rear direction can be obtained.
Further, the operation when the writing section 41 is retracted will not be described in detail, and the pressing operation of the pressing member 20 is performed again, so that the cam slope 32 at the rear end of the protrusion 31 is separated from the cam slope 12 of the shaft tube 10 and returned into the chute 11, and the core 40 is retracted.
< embodiment 2 >
Next, the push-type writing instrument 2 shown in fig. 5 to 7 will be described. Since the structure of the knock-type writing instrument 1 is partially changed in the knock-type writing instrument 2, the changed portions will be mainly described in detail, and the portions that perform the same functions as those of the knock-type writing instrument 1 are denoted by the same reference numerals, and redundant detailed description thereof will be omitted.
The knock-type writing instrument 2 includes: a shaft cylinder 10'; a pressing body 20 'supported in the shaft tube 10' and having a rear end exposed outside the shaft tube; a rotor 30 'which is pushed by the pushing body 20' when it has advanced, and which is rotated and retreated by the cam mechanism a to be locked; a center core 40 connected to the front end side of the rotor 30 'and protruding the writing part 41 from the front end of the shaft tube by the advance of the rotor 30'; a1 st biasing member 51 for biasing the rotor 30 'rearward relative to the shaft tube 10'; and a 2 nd biasing member 52 'for biasing the pressing member 20' rearward.
According to the illustrated example, the shaft 10' is made in one piece from: a long cylindrical shaft tube main body 10 a'; a tapered cylindrical front opening 10b 'screwed to the front end side of the shaft tube main body 10 a'; and an intermediate cylinder 10c 'fitted to the rear end side of the inner peripheral surface of the shaft cylinder body 10 a'.
As another example of the shaft tube 10 ', a single long substantially tubular shaft can be formed, a plurality of tubular members are connected in the axial direction, and a distal end side of the shaft tube main body 10 a' has a grip portion made of an elastic material.
The intermediate tube 10c 'is a substantially cylindrical member fitted to the rear end side of the inner peripheral surface of the shaft tube main body 10 a' so as to be unrotatable and incapable of moving forward and backward.
The inner peripheral surface of the intermediate tube 10 c' is provided with a slide groove 11, a cam slope 12, a locking surface 18, and a projection 13 that is located behind the slide groove 11 and annularly projects radially inward, which constitute a cam mechanism a (see fig. 3), in the same manner as the shaft tube 10 of the knock-type writing instrument 1. As another example, these structures may be formed on the inner peripheral surface of the shaft tube main body 10a 'and the intermediate tube 10 c' may be omitted.
The pressing member 20 'is formed in a substantially cylindrical shape, is supported in the shaft tube 10' (more specifically, the intermediate tube 10c ') so as to move forward and backward in the 1 st range W1 with respect to the shaft tube 10', and has a rear end side projecting rearward of the shaft tube.
The push body 20' has a protrusion 21c on the outer peripheral surface, a cam slope 21a at the tip end, a protrusion 21b on the rear end side of the inner peripheral surface, and the like, as in the slide cylinder 21.
A stepped portion 20a ' for receiving the rear end portion of the 2 nd biasing member 52 ' is provided on the inner peripheral surface of the pressing body 20 ' on the front side of the convex portion 21 b.
The rotor 30 ' is integrally formed with a front half-side cylindrical portion 30a ' and a shaft-like portion 30b ' having a smaller diameter than the cylindrical portion 30a ' and located on a rear half-side, and is supported rotatably and reciprocatingly in the middle cylinder 10c ' in a state where the shaft-like portion 30b ' is inserted into the pressing body 20 '.
Similarly to the rotor 30, when the rotor 30 ' is pushed by the pushing body 20 ' and advances by a predetermined amount, it is rotated and locked by the cam mechanism a, and when it is pushed again by the pushing body 20 ', the locked state is released (see fig. 3).
Similarly to the rotor 30, the cylindrical portion 30a 'is provided with a ridge 31, a cam slope 32, and the like, and an annular recess 35 extending in the front-rear direction is formed on the outer peripheral surface of the shaft-like portion 30 b'. The front-rear width X of the recess 35 is set to include the 2 nd range W2 (refer to fig. 7).
The front end side in the cylindrical portion 30 a' receives the rear end portion of the core 40 and is fitted detachably to the core 40.
A cylindrical space for mounting the 2 nd biasing member 52 'is secured between the inner peripheral surface of the pressing body 20' on the front side of the 2 nd biasing member 52 'and the outer peripheral surface of the shaft-like portion 30 b' on the rear half side thereof. Further, a stepped portion 30b1 ' that receives the tip end portion of the 2 nd urging member 52 ' is formed in the shaft-like portion 30b '.
The 2 nd biasing member 52 'indirectly biases the pressing body 20' rearward with respect to the shaft tube 10 'via the rotor 30', the core 40, the 1 st biasing member 51, and the like.
As will be described in detail below, the 2 nd urging member 52 ' is a compression coil spring, and is fitted in a ring shape between the inner peripheral surface of the pressing body 20 ' and the outer peripheral surface of the shaft-shaped portion 30b ' by locking the front end side to the rotor 30 ' and locking the rear end side to the pressing body 20 '.
The biasing force (spring load) of the 2 nd biasing member 52' is larger than the biasing force of the 1 st biasing member 51 that is extended in the accommodated state (see fig. 5) of the writing part 41 and smaller than the biasing force of the 1 st biasing member 51 that is contracted in the protruding and locking state (see fig. 6 b) of the writing part 41.
In the knock-type writing instrument 2, the basic configuration of the cam mechanism a is substantially the same as that of the above-described knock-type writing instrument 1 (see fig. 3).
Next, the characteristic operational effects of the knock-type writing instrument 2 configured as described above will be described in detail.
As shown in fig. 5, in the initial state in which the writing section 41 is accommodated, the pressing body 20 ' is biased rearward with respect to the rotor 30 ' by the 2 nd biasing member 52 ', and the rearward movement is restricted by the projection 21b abutting the rear end in the recess 35 and the rear end of the ridge 21c abutting the projection 13.
In this initial state, the rotor 30 ' is pressed against the rear end of the core 40, the core 40 is pressed against the rear end of the 1 st biasing member 51, and the 1 st biasing member 51 is pressed against the stepped portion 15 ' in the shaft tube 10 '.
Therefore, the pusher 20' is stationary without shaking in the front-rear direction.
When the pressing member 20 'moves forward, the writing section 41 protrudes from the distal end of the barrel 10 (see fig. 6 a), and the rotor 30' is rotated and locked by the action of the cam mechanism a (see fig. 3), and the protruding state of the writing section 41 is maintained (see fig. 6 b), as in the case of the pressing writing instrument 1.
In this protruding state, the pressing body 20 ' is biased rearward with respect to the rotor 30 ' by the second biasing member 52 ' and the convex portion 21b abuts against the rear end of the concave portion 35, so that the rearward movement is restricted.
In this protruding state, the rotor 30 'receiving the 2 nd biasing member 52' at the front is biased rearward by the elastic force of the 1 st biasing member 51 that has contracted, and the cam slope 32 is locked to the locking surface 18 (see fig. 3 d).
Therefore, the pressing body 20' is stationary without shaking back and forth.
Therefore, according to the knock-type writing instrument 2, as in the case of the knock-type writing instrument 1, the state of the writing section 41 can be visually judged from the front and rear positions of the knock body 20, and the occurrence of sound and vibration can be prevented by suppressing the rattling of the knock body 20.
In particular, according to the preferred embodiment shown in the drawings, the 2 nd biasing member 52 ' is disposed between the inner circumferential surface of the pressing body 20 ' and the outer circumferential surface of the rotor 30 ', and therefore, a compact structure having a short length in the front-rear direction and being thin can be obtained.
In the relationship between the pressing body 20 (or 20 ') and the rotor 30 (or 30'), the convex-concave relationship between the convex portion 21b and the concave portion 35 may be reversed. That is, as another example, a concave portion may be provided on the side of the push-piece and a convex portion may be provided on the side of the rotor.
The present invention is not limited to the above-described embodiments, and can be modified as appropriate within a scope not departing from the gist of the present invention.
Claims (8)
1. A knock-type writing instrument comprising:
a shaft cylinder;
a pressing body supported in the shaft tube so as to move forward and backward in the 1 st range with respect to the shaft tube, and having a rear end side exposed outside the shaft tube;
a rotor which is pushed by the pressing body to advance;
a cam mechanism for rotating and locking the rotor when the rotor has advanced through a cam slope;
a center core connected to a front end side of the rotor and having a writing section projected from a front end of the shaft by the forward movement of the rotor; and
a1 st biasing member that biases the rotor rearward with respect to the shaft tube,
the pressing body is connected to be capable of performing fine motion forward and backward relative to the rotor in a 2 nd range smaller than the 1 st range,
the pressing writing tool is provided with a 2 nd force application component which applies force to the pressing body backwards relative to the shaft cylinder,
the 2 nd urging member engages the front end side thereof with the shaft tube and engages the rear end side thereof with the pressing body, thereby urging the pressing body rearward.
2. The push-to-write instrument according to claim 1,
a rear portion side of the rotor is formed in a shaft shape, the pressing member is formed in a cylindrical shape fitted to the rear portion side of the rotor, a concave portion extending in a front-rear direction is provided in one of the rotor and the pressing member, and a convex portion movable in the front-rear direction in the concave portion is provided in the other of the rotor and the pressing member,
the front-rear width of the recess is set to include the 2 nd range.
3. The push-to-write instrument according to claim 2,
the 2 nd urging member is a compression coil spring which is fitted to the pressing body in a ring shape, and has a front end side locked to the shaft tube and a rear end side locked to the pressing body, and the recessed portion and the raised portion are arranged on a radially inner side thereof.
4. Press-action writing instrument according to claim 1 or 2,
the 2 nd biasing member biases the pressing body rearward by locking a front end side thereof to the rotor and locking a rear end side thereof to the pressing body.
5. The push-to-write instrument according to claim 2,
the 2 nd urging member is a compression coil spring, and is fitted in a ring shape between an inner peripheral surface of the pressing body and an outer peripheral surface of the rotor by locking a front end side thereof to the rotor and locking a rear end side thereof to the pressing body.
6. Press-action writing instrument according to claim 1 or 2,
the cam mechanism has a cam slope on the front end side of the pressing body, the cam slope moves in the front-rear direction while sliding and rotating the rotor when the rotor has advanced,
the 2 nd range is set to be longer than the amount of movement in the front-rear direction by the cam slope of the pressing body.
7. Press-action writing instrument according to claim 3 or 5,
the cam mechanism has a cam slope on the front end side of the pressing body, the cam slope moves in the front-rear direction while sliding and rotating the rotor when the rotor has advanced,
the 2 nd range is set to be longer than the amount of movement in the front-rear direction by the cam slope of the pressing body.
8. The push-to-write instrument according to claim 4,
the cam mechanism has a cam slope on the front end side of the pressing body, the cam slope moves in the front-rear direction while sliding and rotating the rotor when the rotor has advanced,
the 2 nd range is set to be longer than the amount of movement in the front-rear direction by the cam slope of the pressing body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-049756 | 2017-03-15 | ||
| JP2017049756A JP6853701B2 (en) | 2017-03-15 | 2017-03-15 | Knock type writing tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108621641A CN108621641A (en) | 2018-10-09 |
| CN108621641B true CN108621641B (en) | 2021-07-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810206737.7A Active CN108621641B (en) | 2017-03-15 | 2018-03-14 | Press type writing tool |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6853701B2 (en) |
| CN (1) | CN108621641B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7461826B2 (en) | 2020-08-04 | 2024-04-04 | 三菱鉛筆株式会社 | Knock-type writing instrument |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009255426A (en) * | 2008-04-18 | 2009-11-05 | Pilot Corporation | Knock-type writing instrument |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA874503B (en) * | 1986-07-07 | 1987-12-28 | Parker Pen (Benelux) B.V. | Writing instrument |
| JPH0615743Y2 (en) * | 1987-05-15 | 1994-04-27 | ぺんてる株式会社 | Knock type writing instrument |
| JP3768057B2 (en) * | 2000-02-10 | 2006-04-19 | 株式会社壽 | Knock-type writing instrument |
| JP2003154788A (en) * | 2001-11-26 | 2003-05-27 | Sailor Pen Co Ltd:The | Refill out-in mechanism of writing appliance |
| JP4855341B2 (en) * | 2007-06-05 | 2012-01-18 | 株式会社パイロットコーポレーション | Knock-type writing instrument |
| JP4908648B1 (en) * | 2011-06-22 | 2012-04-04 | 雄樹 栗原 | Double knock mechanism |
| JP5985332B2 (en) * | 2012-09-24 | 2016-09-06 | 株式会社パイロットコーポレーション | Rotating operation writing instrument |
| JP6373693B2 (en) * | 2014-09-11 | 2018-08-15 | ゼブラ株式会社 | Intrusive writing instrument |
-
2017
- 2017-03-15 JP JP2017049756A patent/JP6853701B2/en active Active
-
2018
- 2018-03-14 CN CN201810206737.7A patent/CN108621641B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009255426A (en) * | 2008-04-18 | 2009-11-05 | Pilot Corporation | Knock-type writing instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018149787A (en) | 2018-09-27 |
| JP6853701B2 (en) | 2021-03-31 |
| CN108621641A (en) | 2018-10-09 |
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