JPH0568687U - Double knock writing instrument - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a brunock-type writing instrument that has a small number of parts, has a simple structure, and is easy to assemble. [Structure] The first knocking operation causes a guide projection to be inserted into a shallow groove and guided by a knock rod guided by a knock rod to advance along the deep groove of the cam, and the rotor that has slipped out of the deep groove of the cam is rotated. The double knock type writing instrument in which the pen body of the reference file is projected by engaging with the locking step portion at the tip of the cam, and the rotor is disengaged from the locking step portion by the second knocking operation, and the pen body is retracted into the barrel. At the end of the barrel 1 from the tail end edge 31
Between the shallow groove 33 of the cam and the knock bar 5
And the knock cover are integrally formed, and the knock rod 5 is inserted from the tail end opening of the shaft cylinder along the guide protrusion 51 of the knock rod 5 and is rotated to engage the guide protrusion 51 with the shallow groove 33 of the cam. To combine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double knock type writing instrument having a small number of parts and a simple structure.

[0002]

[Prior Art]

 The double knock type writing instrument has a retracting mechanism consisting of a cam, a rotor, and a knock rod housed in the shaft cylinder, and the first pen knocking operation that presses the knock cover protruding from the tail end opening of the shaft cylinder causes the refill pen body to move. The pen body projects from the front end of the barrel and the pen body is retracted into the barrel by the second knocking operation. To further explain this, a cam groove consisting of a shallow groove and a deep groove is formed on the inner peripheral surface of the shaft cylinder, and the knock rod has a guide projection protruding on its outer periphery guided by the shallow groove to move back and forth. To do. Then, a protrusion is provided on the outer peripheral surface of the rotor, and when the rotor is pressed by the knock rod that moves forward by the first knock operation, this protrusion moves forward along the deep groove of the cam, and the rotor moves. When it comes out of the deep groove of the cam, it rotates and the projection engages with the locking stepped portion at the tip of the cam, and the pen body of the reef projects. Then, by the second knocking operation, the rotor pressed by the knocking rod moves forward a little and rotates to disengage from the locking step portion, and the pen body sinks into the barrel.

[0003]

[Problems to be solved by the device]

 In such a double knock type writing instrument, the shallow groove of the cam formed on the inner peripheral surface of the barrel does not extend to the tail end edge of the barrel, and a step is formed at the end on the tail end side. The guide projection of the knock rod comes into contact with this step to prevent the knock rod from falling out of the tail end opening of the barrel. Therefore, when assembling, the knock rod is inserted from the front end opening of the barrel and the knock cover is inserted from the tail end opening of the barrel to connect the knock rod and the knock cover in the barrel. In other words, the knock rod and the knock cover need to be separate parts, which increases the number of parts and complicates the structure, resulting in a troublesome assembling process.

Therefore, an object of the present invention is to provide a brunock type writing instrument which has a small number of parts, has a simple structure, and is easy to assemble.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a knock rod that advances by being guided by a shallow groove of a cam formed on the inner peripheral surface of a shaft cylinder by a first knock operation to guide a guide projection protruding on the outer peripheral surface. The protrusion of the rotor pressed by moves forward along the deep groove of the cam, and the protrusion that comes out of the deep groove of the cam rotates and engages with the locking step at the tip of the cam, and the pen body of the reef protrudes. The double knock type writing instrument in which the second knocking operation causes the rotor pressed by the knock bar to move forward a little and rotate to disengage from the locking step, and the pen body is retracted into the barrel. The guide groove is formed between the tail edge and the shallow groove of the cam, and the knock rod and the knock cover are integrally formed, and the guide rod of the knock rod is guided along the introduction groove to open the tail end of the barrel. , And rotate it to engage the guide protrusion with the cam's shallow groove. That.

[0006]

[Action]

 That is, since the introduction groove is formed between the tail end edge of the shaft cylinder and the shallow groove of the cam, it is possible to insert the knock rod into the shaft cylinder from the tail end opening of the shaft cylinder by using this introduction groove. become. Therefore, the knock rod and the knock cover can be integrally formed, the number of parts is small, and the structure is simple.

[0007]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, a barrel 1 made of a synthetic resin has a tip 11 screwed to the tip thereof, and a ballpoint pen refill 2 which is elastically bulged to the tail end side by a spring 22 is arranged inside. Then, as shown in FIGS. 1 and 2, on the inner peripheral surface of the shaft cylinder 1, three deep grooves 32 and three shallow grooves 33 are alternately formed at equal intervals of 60 ° in the axial direction. A cam is formed. Further, the tip of the cam is inclined in a sawtooth shape, and the tip edge of the shallow groove 33 is the locking step portion 34. An introduction groove 31 having the same depth as the shallow groove 33 is formed continuously with the deep groove 32, that is, between the shallow grooves 33, up to the tail end opening edge of the barrel 1. Therefore, the deep groove 32 also serves as the introduction groove 31.

The cam including the deep groove 32, the shallow groove 33, and the locking step portion 34, the knock rod 5, and the rotor 4 constitute a retracting mechanism. The knock rod 5 projects from the rear end opening of the barrel 1. That is, the conventional knock cover has a shape integrally molded, and the clip 6 is also integrally molded. As shown in FIG. 3, three guide projections 51 are formed on the outer periphery of the front end of the knock rod 5, and the front end is a pressing portion 52 inclined in a sawtooth shape. Then, the guide protrusions 51 are fitted in the shallow grooves 33, respectively, and the knock rod 5 is guided by the shallow grooves 33 to move back and forth.

As shown in FIG. 4, three protrusions 41 with inclined rear end faces are formed on the outer circumference of the tip of the rotor 4, and the protrusions 41 are fitted into the deep cam grooves 32. The rear end of the ball-point pen refill 2 abuts the rotor 4. Therefore, when the protrusion 41 of the rotor 4 and the pressing portion 52 of the knock rod 5 collide with each other by the elastic force of the spring 22, and the knock rod 5 is moved forward by a knock operation, the rotor 4 also moves forward, Since the rear end surfaces of the pressing portion 52 and the protrusion 41 are inclined, the rotor 4 advances in the state in which the rotational force is applied.

Next, the method of assembling the double knock type writing instrument will be described. First, the knock bar 5 is inserted from the tail end opening of the barrel 1 with the guide protrusion 51 along the introduction groove 31. Then, when the guide protrusion 51 exits the deep groove 32 which is continuous with the introduction groove 31, the knock rod 5 is rotated by 60 ° to engage the guide protrusion 51 with the shallow groove 33. Then, the rotor 4, the ball-point pen refill 2, and the spring 22 are inserted from the tip opening of the barrel 1, and the front port 11 is fitted into the tip opening of the barrel 1 to complete the assembly. In this way, since the knock rod 5 can be inserted and assembled from the rear end opening of the shaft cylinder 1, the conventional knock cover and the knock rod 5 can be integrated, the number of parts is small, and the structure is simple. One can be easily assembled.

When the knocking rod 5 is pressed to perform the first knocking operation, the protrusion 41 of the rotor 4 advances along the deep groove 32 with the rotational force applied, but the deep cam groove 32 When it is pulled out, it rotates 60 ° and engages with the locking step 34. At this time, as shown in FIG. 1, the pen body 21 at the tip of the refill 2 projects from the front opening 11, and the projection 41 of the rotor 4 engages with the locking step portion 34 to receive the writing pressure, which enables writing. ..

Next, in order to immerse the pen body 21 in the front opening 11, a second knock operation, which is the same operation as the first knock operation, is performed. As a result, the pushing portion 52 of the knock rod 5 which is guided and advanced by the shallow groove 33 pushes up the projection 41 of the rotor 4 engaged with the locking step portion 34 a little while applying the rotating force. Therefore, the rotor 4 rotates by 60 °, and the protrusion 41 recedes along the other adjacent deep groove 32, so that the pen body 21 sinks into the front opening 11.

[0013]

[Effect of the device]

 As described above, in the double knock type writing instrument of the present invention, the introduction groove is formed between the tail end edge of the barrel and the shallow groove of the cam, and the knock rod is used to make the knock rod tail of the barrel. The knock rod and the knock cover can be integrally molded because they can be assembled from the end opening into the shaft cylinder, and the number of parts is small, the structure is simple, and the assembly is easy. ..

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention and a development explanatory view of a cam.

2A is a line AA in FIG. 1, and FIG. 2B is a line B- in FIG.
Line B and (C) are cross-sectional views of the barrel along line CC of FIG. 1.

FIG. 3A is a front view of a knock rod, and FIG. 3B is a bottom view.

FIG. 4A is a front view of a rotor, and FIG. 4B is a bottom view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 11 Front end 2 Refill 21 Pen body 22 Spring 31 Introduction groove 32 Deep groove 33 Shallow groove 34 Locking step part 4 Rotor 41 Projection 5 Knock bar 51 Guide projection 6 Clip

Claims (1)

[Scope of utility model registration request] 1. A rotor knocked by a knocking rod that advances by being guided by a shallow groove of a cam formed on an inner peripheral surface of a shaft cylinder by a first knocking operation, and a guide protrusion provided on an outer peripheral surface of the rotor. The protrusion moves forward along the deep groove of the cam, and the protrusion that slips out of the deep groove of the cam rotates and engages with the locking stepped portion at the tip of the cam to project the pen body of the refill. By the second knocking operation, the knock rod In the double knock type writing instrument in which the rotor pressed by the lever is slightly advanced and rotated to be disengaged from the locking step, and the pen body is retracted into the barrel, the introduction groove is formed from the tail end edge of the barrel to the cam. Is formed between the shallow grooves of the shaft, and the knock bar is formed integrally with the knock cover.The knock bar is inserted from the tail end opening of the barrel along with the guide projection of the knock bar and is rotated. The guide projection is engaged with the shallow groove of the cam. Double knock-type writing instrument.