JP3774804B2 - Intrusive writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a locking mechanism in which a refill having a pen tip attached to the tip of an ink tank is accommodated in a shaft cylinder so as to be movable back and forth while being urged backward by a coil spring, and is engaged with the refill by operating an operation member. Is a retractable writing instrument that engages and retracts the tip of the pen tip from the tip end of the shaft cylinder by this locking mechanism, and a plurality of different locking positions formed on the inner wall of the shaft cylinder. A rotating cam that alternately locks in the locking groove of the rotating cam and a slider that applies a sliding force to the rotating cam by operating the operating member, and the operating member is formed on the front side wall of the shaft cylinder It relates to the one that can be operated by protruding from the side hole.
[0002]
[Prior art]
Conventionally, in order to form a pen tip protruding state and an immersion housing state from the tip of the shaft cylinder, a locking mechanism having a rotating cam that alternately locks by a plurality of locking grooves with different locking positions by rotation is used. A haunting writing instrument is known. In the locking mechanism of the projecting and retracting that uses the rotating cam, the protruding pieces of the rotating cam are sequentially engaged with the alternately arranged longitudinal short grooves and long grooves, and when the short cam is engaged, the pen tip When the protruding state is formed and the long groove is engaged, the pen tip is immersed by the rear biasing force of the coil spring applied to the refill.
[0003]
[Problems to be solved by the invention]
The retractable writing instrument as described above moves the pen tip from the immersive state to the protruding state by changing the position of the operation member. The pen tip is in a state before the operation member is moved, and the rotary cam is sandwiched between the refill urged rearward by the coil spring and the operation member locked off, and each member is fixed. Has been. However, in the protruding state of the nib, the rotating cam engaged with the short groove is sandwiched between the engaging wall of the groove and the refill that is biased backward, and the coil spring that biases the refill backward This urging force is not applied to the member that applies the sliding force to the rotating cam. Then, the operation member that has moved the pen tip to the protruding position can be freely moved except for being pulled out and locked, and is constantly moved by gravity and the inertia of the movement of the writing instrument body. Such an unstable state in which the operation member is not fixed is formed at the time of writing in which the pen tip protrudes, so that it is difficult to hold the operation member at the time of writing with the operation member positioned on the front side wall of the shaft cylinder. was there.
[0004]
[Means for Solving the Problems]
That is, according to the present invention, a refill having a pen tip attached to the tip of an ink tank is accommodated in a shaft cylinder so as to be movable back and forth while being urged backward by a coil spring, and engaged with the refill by operating an operation member. A retractable writing instrument that moves the locking mechanism back and forth and locks the tip of the pen tip from the tip end of the shaft cylinder by this locking mechanism. The locking mechanism is formed at the locking position formed on the inner wall of the shaft cylinder. A rotating cam that alternately locks into a plurality of different locking grooves by rotation and a slider that applies a sliding force by operating the operating member to the rotating cam. The operating member is attached to the front side wall of the shaft tube. In the one that can be operated by projecting from the formed lateral hole, an elastic member is interposed between the inner step portion formed in the shaft cylinder and the slider, and the slider is urged backward. , Infestation formed by applying a rear biasing force to the operation member The gist of the writing instrument.
[0005]
【Example】
Hereinafter, an example will be described with reference to the drawings. Each drawing shows a writable state where the pen tip protrudes.
A ballpoint pen tip 2a and an ink tank 2b, which is a pipe body made of polypropylene resin for containing ink, are disposed in a shaft cylinder 1 composed of a conical cylinder 1a and a rear cylinder 1b that gradually reduce in diameter toward the front end. The connected refill 2 receives the elastic force of the coil spring 3 disposed inside the front tube 1a by a ridge 2c formed on the side wall, and is urged rearward and accommodated so as to be movable back and forth. A crown 4 having a clip 4a is connected to the rear end of the barrel 1.
[0006]
In addition, the shaft cylinder 1 accommodates a locking mechanism for keeping the ballpoint pen tip 2a of the refill 2 in and out of the front end of the front cylinder. 6 is connected. The push button 6 is a box-shaped member made of polyoxymethylene resin. Although not shown in the drawing, the push button 6 is only locked off from the lateral hole of the rear cylinder by an outward projection formed on the side wall. It can move freely in the axial direction.
[0007]
As shown in FIG. 2, which is an enlarged view of the main part of FIG. 1, the locking mechanism for slidingly locking the refill 2 includes a rotary cam 7 that changes the longitudinal position in the rear cylinder 1b by rotation, A sliding cam 8 that applies a sliding force and a rotational force in the longitudinal direction to the cam; a connecting member 9 that converts the radial pressing force of the push button 6 into a sliding force in the longitudinal direction and slides the sliding cam 8; It is made up of. Since each member of these locking mechanisms is a member that repeats contact and sliding contact with other members, a polyoxymethylene resin is used that has as little frictional resistance as possible and that minimizes deformation and wear due to friction.
[0008]
In the protruding state of the ballpoint pen tip 2a which is a pen tip, the rotating cam 7 is locked to a short groove among the alternately arranged locking grooves 1c formed on the inner wall of the rear cylinder 1b and having different lengths. The blades 7a are provided. The blade 7a has an inclined wall 7b at the rear, and rotates in a certain direction when it comes into contact with a sawtooth-shaped angled inclined surface 8a at the front end of a sliding cam 8 described later. The mating grooves 1c are alternately engaged. The tip of the rotating cam 7 is in contact with the protrusion 2c of the refill 2 urged rearward by the coil spring 3, and the blades 7a alternately engage with the long and short engaging grooves alternately. Forms the pen tip appearance.
[0009]
The sliding cam 8 has a plurality of serrated angled inclined surfaces 8a at the front end as a contact portion with the rotating cam 7, and engages with a sliding groove 1d formed on the inner wall of the rear cylinder 1b on the side wall. It has a sliding projection 8b that moves.
The connecting member 9 has two inclined walls 9 a as a portion for receiving the pressing force in the radial direction of the push button 6, and comes into contact with the front and rear legs 6 a of the push button 6. Further, the connecting member 9 has a projection 9b that contacts the inner wall of the rear cylinder 1b on the side wall opposite to the inclined wall 9a, so that the frictional resistance with the inner wall of the rear cylinder 1b is minimized when sliding. .
[0010]
When the pressing button 6 is pressed, the leg 6a comes into contact with the inclined wall 9a of the connecting member 9, the connecting member moves in the forward direction, and the sliding cam 8 is moved. The sliding cam 8 comes into contact with the blade 7a of the rotating cam 7 at the angled inclined surface 8a. When the inclined wall 7b at the rear of the blade 7a and the angled inclined surface 8a abut against each other while applying a pressing force, the rotating cam 7 moves forward while sliding and reaches the opening of the engagement groove 1c. It sometimes rotates and engages with the adjacent engaging groove 1c to lock the pen tip.
[0011]
In addition, a coil spring 10 is installed as an elastic member on the step formed by the inward protrusion 1e formed on the inner wall of the rear cylinder 1b, and is sandwiched between the circumferential protrusion 9c formed on the connecting member 9. In the illustrated pen tip protruding state, the rotary cam 7 is engaged in the short engagement groove, and therefore is positioned in the forward direction. However, the urging force of the coil spring 3 that urges the refill 2 rearward is not transmitted to the sliding cam. The connecting member 9 is urged rearward by the coil spring 10 installed on the inward projection 1e of the rear cylinder 1b, and the push button 6 is pushed up and fixed by the inclined wall 9a. Naturally, since the elastic force of the coil spring 10 is set smaller than the force of the pressing operation for the pen tip to appear and disappear, the pressing operation is not affected. Further, since the elastic force of the coil spring 10 is applied to the operation member 9 even when the pen tip is stored, the pressing button 6 is fixed. By doing so, the push button 6 can always keep the same state except during operation, and in particular, there is a rattling sound caused by free movement during writing, or it collides with a hand held during writing. And things that get in the way can be suppressed as much as possible.
[0012]
Here, each of the rotating cam 7 and the sliding cam 8 has a protruding portion (blade 7a, sliding protrusion 8b) that engages with a groove formed on the inner wall of the rear cylinder 1b. Since it has the inward protrusion 1e which installs the spring 10, when installing these rotation cams 7 and the sliding cam 8 which are inner members in the rear cylinder 1b, it must insert from the front side of the rear cylinder 1b. For this reason, a small-diameter tip opening that projects the pen tip is formed in the tip cylinder 1a, which is a separate member. The front tube 1a and the rear tube 1b are connected by screwing, but a small-diameter portion formed at the tip of the rear tube 1b by forming a female screw portion 1f on the inner wall so that the front tube 1a becomes an outer member. By forming the male screw portion 1g on the outer surface, the outer diameter can be made as continuous as possible, the inner wall of the rear cylinder 1b that accommodates the locking mechanism that is a sliding member in the shaft cylinder is easy to grip. It can be formed into a straight pipe without a step, and the possibility of hindering the movement of the content member is suppressed as much as possible. The connection between the front tube 1a and the rear tube 1b may be overfitting or bonding in addition to screwing, but screwing is preferable in consideration of replacement of the refill. Reference numeral 11 is a locking ring made of a soft polyethylene resin for preventing the contents from falling off at once when the front tube 1a is removed, and is press-fitted into the opening of the rear tube 1b.
[0013]
A modification is shown in FIGS.
In the example of FIG. 3, the elastic force of the coil spring 10 installed on the inner protrusion 1 e of the inner wall of the rear cylinder 1 b is applied to the circumferential convex portion 8 c formed on the sliding cam 8. An elastic force is applied to the sliding cam 8 and the pressing button 6 is pushed up from the sliding cam 8 through the connecting member 9.
In the example of FIG. 4, the sliding cam and the connecting member are formed as an integral slider 12, the angled inclined surface 12 a that comes into contact with the rotating cam 7, the sliding projection 12 b that engages with the sliding groove 1 d, and the pressing button 6. This is an example in which the inclined wall 12c that contacts and the circumferential convex portion 12d that receives the elastic force of the coil spring 10 are formed.
[0014]
FIG. 5 shows another example. The difference from the above example is that the operating member does not give a pressing force in the radial direction like a pressing button, and the slide piece 13 slides in the longitudinal direction on the slide groove 1h formed on the side wall of the rear cylinder 1b. The connecting member 14 also applies the sliding force of the sliding piece directly to the sliding cam 8. Here, the connecting member 14 receives the elastic force of the coil spring 10 at the stepped portion 14a, and always urges the slide piece 13 rearward to fix it when not operated.
[0015]
【The invention's effect】
According to the present invention, a retractable writing instrument having an operating member positioned on the front side wall of the shaft cylinder, in which a rotating cam is used for the retracting locking mechanism, the operating member can be used even when the pen tip protrudes. It is fixed even at the time of immersion, and it is possible to secure a state where it can be easily held during writing.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of an essential part showing an example.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged cross-sectional view of a main part showing a modification.
FIG. 4 is an enlarged cross-sectional view of a main part showing a modification.
FIG. 5 is an enlarged cross-sectional view of a main part showing another example.
[Explanation of symbols]
1 Shaft cylinder 1a Lead cylinder 1b Rear cylinder 1c Locking groove 1d Sliding groove 1e Inner protrusion 1f Female thread 1g Male thread 1h Slide groove 2 Refill 2a Ballpoint pen tip 2b Ink tank 2c Projection 3 Coil spring 4 Head crown 4a Clip 5 Horizontal hole 6 Press button 6a Leg 7 Rotating cam 7a Blade 7b Inclined wall 8 Sliding cam 8a Mountain-shaped inclined surface 8b Sliding protrusion 8c Circumferential convex part 9 Connecting member 9a Inclined wall 9b Protrusion 9c Circumferential convex part 10 Coil Spring 11 Locking ring 12 Slider 12a Angle inclined surface 12b Sliding projection 12c Inclined wall 12d Circumferential convex portion 13 Slide piece 14 Connecting member 14a Step portion

Claims (4)

A refill with a nib attached to the tip of the ink tank is accommodated in the shaft cylinder so that it can move back and forth while being urged backward by a coil spring, and the locking mechanism engaged with the refill is moved back and forth by operating the operating member. The locking mechanism is a retractable writing instrument that locks the tip of the pen tip from the tip end of the shaft cylinder. The locking mechanism includes a plurality of locking grooves formed on the inner wall of the shaft cylinder and having different locking positions. A rotating cam that is alternately locked by rotation and a slider that applies a sliding force to the rotating cam by operating the operating member. The operating member protrudes from a lateral hole formed in the front side wall of the shaft cylinder. In this configuration, an elastic member is interposed between the inner step formed in the shaft cylinder and the slider, and the slider is urged rearward so that the operation member is rearwardly moved. An in / out type writing instrument with a biasing force. A sliding member in which the operating member is a pressing member that is slidable in the axial diameter direction, and the slider is engaged with a sliding groove formed on the inner wall of the shaft cylinder to slide in the longitudinal direction to directly move the rotary cam. A cam and a connecting member that has an inclined wall that receives a pressing force in the radial direction of the pressing member, and that converts the pressing force in the radial direction of the pressing member into a sliding force in the longitudinal direction; The retractable writing instrument according to claim 1, wherein the writing instrument is interposed between an inner step portion formed inside and a connecting member. Consists of a cone-shaped front tube that gradually reduces the diameter of the shaft tube toward the front end opening, and a rear tube that is detachably screwed to the front end and has a lateral hole that projects the operation portion on the side wall. The retractable writing instrument according to claim 1 or 2, wherein A male screw portion is formed as a reduced diameter portion of the outer cylinder at the distal end portion of the rear cylinder to which the front cylinder is screwed, so that the outer diameter of the front cylinder and the rear cylinder after connection is substantially the same diameter, and the front end of the rear cylinder The retractable writing instrument according to claim 3, wherein the front inner wall of the rear cylinder including the male screw part has substantially the same diameter.

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