JP4333324B2 - Shaft connection structure - Google Patents

Description

  The present invention relates to a shaft-shaft connecting structure, and more particularly, to a rotating-type feeding device that causes a rod-like body such as a long eraser or a ballpoint pen to protrude from a holder and a side knock-type mechanical pencil.

As an example, there is a writing instrument in which a device for feeding out a long eraser is arranged behind a mechanical pencil. More specifically, a rod-shaped body guide member 4 is rotatably disposed inside the spiral member 2 with which the clip 10 is integrally formed. The spiral member 2 and the rod-shaped body guide member 4 (head 4A) are connected to each other. By rotating relatively, the rod-shaped body 9 appears and disappears from the rod-shaped body guide member 4. And the rod-shaped body feeding apparatus comprised from those, the spiral member 2, the rod-shaped body guide member 4, etc. is attached with respect to the outer cylinder 11 of a mechanical pencil so that attachment or detachment is possible. The rod-like body feeding device and the outer cylinder 11 are attached by engagement between a convex portion 14 formed on the outer peripheral surface of the spiral member 2 and a concave portion 15 formed on the inner peripheral surface of the outer cylinder 11.
Utility Kaihei 4-86776.

However, if the rod-like body feeding device and the outer cylinder 11 are repeatedly attached and detached, the engaging force at the attachment portion, that is, the engaging force between the protrusion 14 and the recess 15 is weakened, and the outer cylinder 11 is attached to one of the outer cylinders 11. When picking with a finger and rotating the head 4A with the other finger, the spiral member 2 also rotates, and as a result, the rod-shaped body 9 may not be able to appear and disappear from the rod-shaped body feeding device.
In particular, in the so-called side knock type mechanical pencil in which the mechanical pencil has a pressing operation part on the side surface of the outer shaft 11, the clip comes to various positions with respect to the pressing operation part. Depending on the position of the clip, there was a sense of incongruity in writing. That is, in general, the side knock type mechanical pencil is in a state where the pressing operation part can be operated with the thumb to facilitate the lead-out operation, specifically, with the pressing operation member facing upward. Grasp and write. At this time, if the clip is positioned on the side opposite to the pressing operation portion, the clip comes into contact with the base portion between the thumb and the index finger, and the writing becomes uncomfortable.

The present invention is a connecting structure between a shaft and a shaft, wherein a projecting portion whose outer edge is curved is formed on an end surface of one shaft, and the one projecting portion is fitted into the other shaft, and, forming a groove with a substantially same shape as the protruding portion, also, in that a rod-like member feeding apparatus to the one axis as a first aspect, there in coupling structure between the shaft and the shaft In addition, a projecting portion whose outer edge is curved is formed on the end surface of one shaft, and the one projecting portion is fitted into the other shaft, and the groove portion has substantially the same shape as the projecting portion. In addition, a clip is provided on the outer peripheral portion of one of the shafts, a core feeding mechanism is disposed on the other shaft, and an operation portion of the core feeding mechanism is provided on the side wall of the shaft . the second gist, a coupling structure of a shaft and the shaft, the outer edge portion is curved on the end face of one of the shaft Rod-shaped so as to form a made the protrusion, the other axis, the one protruding portion is fitted, and to form a groove in which a substantially same shape as the protruding portions, also on the one shaft The third is that the body feeding device is arranged, the clip is provided on the outer peripheral portion of the shaft, the core feeding mechanism is arranged on the other shaft, and the operation portion of the core feeding mechanism is provided on the side wall of the shaft . The gist of

The present invention is a connecting structure between a shaft and a shaft, wherein a projecting portion whose outer edge is curved is formed on an end surface of one shaft, and the one projecting portion is fitted into the other shaft, and, forming a groove with a substantially same shape as the protruding portion, also, in that a rod-like member feeding apparatus to the one axis as a first aspect, there in coupling structure between the shaft and the shaft In addition, a projecting portion whose outer edge is curved is formed on the end surface of one shaft, and the one projecting portion is fitted into the other shaft, and the groove portion has substantially the same shape as the projecting portion. In addition, a clip is provided on the outer peripheral portion of one of the shafts, a core feeding mechanism is disposed on the other shaft, and an operation portion of the core feeding mechanism is provided on the side wall of the shaft . the second gist, a coupling structure of a shaft and the shaft, the outer edge portion is curved on the end face of one of the shaft Rod-shaped so as to form a made the protrusion, the other axis, the one protruding portion is fitted, and to form a groove in which a substantially same shape as the protruding portions, also on the one shaft with placing the body feeding device, the outer peripheral portion of the shaft is provided with clips, also as to place the lead feeding mechanism to the other axis, that you provided in the side wall of the shaft of the operating portion of the lead feeding mechanism 3 since the subject matter, it can always be connected in a fixed position.

  The operation will be described. In the circumferential direction, one shaft and the other shaft are always connected at a fixed position, and their relative rotation is prevented.

  This is a writing instrument with a device for feeding a long eraser behind the mechanical pencil. The mechanical pencil is a so-called side knock type mechanical pencil in which a knock piece 2 is arranged on the side surface of the shaft tube 1. An eraser feeding mechanism 3 for feeding a rod-shaped eraser is detachably attached to the rear of the shaft 1 of the mechanical pencil. The eraser feeding mechanism 3 is unitized and can be attached to various shaft cylinders, for example, a shaft cylinder such as a ballpoint pen or a marking pen.

A cylindrical insertion portion 5 is formed at the front portion of the outer shaft 4 constituting the eraser feeding mechanism 3, and a protruding portion 6 is formed at one portion of the end surface. More specifically, the outer edge portion 6 a of the protruding portion 6 is curved, and the protruding portion 6 is formed in a section of about 180 degrees with respect to the circumferential direction of the outer shaft 4. On the other hand, the portion where the protrusion 6 is not formed is cut off in a direction perpendicular to the central axis of the outer shaft 4. The notch 6b cut off at a right angle is also formed in a section of about 180 degrees with respect to the circumferential direction of the outer shaft 4. An engagement surface 6c parallel to the central axis of the outer shaft 4 is formed at the connecting portion between the curved outer edge portion 6a and the cutout portion 6b.
On the other hand, a projecting portion 6 of the outer shaft 4 is fitted into the rear portion of the shaft tube 1 and a groove portion 7 having substantially the same shape as the projecting portion 6 is formed. An engagement cylinder portion 8 having a reduced diameter is also extended. Similarly to the protruding portion 6, the groove portion 7 has a curved outer edge portion 7 a and is formed in a section of about 180 degrees with respect to the circumferential direction of the shaft tube 1. On the other hand, the portion where the groove 7 is not formed is cut off in a direction perpendicular to the central axis of the shaft tube 1. The cutout portion 7 b cut off at a right angle is also formed in a section of about 180 degrees with respect to the circumferential direction of the shaft tube 1. An engagement surface 7c parallel to the central axis of the shaft tube 1 is formed at a connecting portion between the curved outer edge portion 7a and the cutout portion 7b. In other words, the outer shaft 4 and the shaft tube 1 have the insertion portion 5 (fitting protrusion 5 a) engaged with the engaging tube portion 8 (fitting groove portion 8 a) and the protruding portion 6 engages with the groove portion 7. is there. That is, the eraser feeding mechanism 3 is detachably attached to the shaft tube 1 and is relatively unrotatable when connected .

Next, the rod-shaped body feeding device 3 will be described. A spiral groove 8 is formed on the inner wall surface of the outer shaft 4, and a rod-shaped body guide member 9 is rotatably disposed inside the outer shaft 4. In the longitudinal direction of the rod-shaped body guide member 9, a slit 10 is formed at a position facing it. And, inside the rod-shaped body guide member 9, a rod-shaped body receiving member 11 is arranged so as to be movable up and down, and a projection 12 is formed at a position facing the side surface of the rod-shaped body guide member, It is screwed into the spiral groove 8 through the slit 10. That is, when the outer shaft 4 and the rod-shaped body guide member 9 are relatively rotated, the rod-shaped body receiving member 11 moves up and down, and an eraser attached to the rod-shaped body receiving member 11 along with the vertical movement (in the drawing) (Dotted line) 13 also moves up and down, so that the eraser 13 appears and disappears from the rear end collar 14 of the rod-shaped body guide member 9. The outer shaft 4 and the rod-shaped body guide member 9 include a circumferential groove formed on the inner surface of the rear end flange 14 of the rod-shaped body guide member 9 and a circumferential shape formed on the rear outer surface of the outer shaft 4. Due to the engagement with the protrusion, it is relatively rotatable but not disassembled.
Reference numeral 15 denotes a clip that protrudes outward from the rear outer surface of the outer shaft 14 and is integrally formed with the outer shaft 4. The clip 15 is formed of a separate member such as a metal, and is a resin molded product. You may fix to the outer shaft 4 which consists of. The clip 15 is formed in the same direction as the protrusion 6 of the outer shaft 4 and the knock piece 2. That is, the clip 15, the protruding portion 6, and the knock piece 2 are provided in the same straight line.

Next, the side knock type mechanical pencil mechanism will be described. A slider member 16 is slidably disposed inside the intermediate portion of the shaft tube 1, and two parallel inclined surfaces 17 are formed on the side walls of the slider member 16 at positions facing each other. A pressing portion 19 of the knock piece 2 mounted in a window hole 18 formed on the side wall of the shaft cylinder 1 is in contact with the inclined surface 17 (see FIG. 4). When the knock piece 2 is pressed in the radial direction of the shaft tube 1, the slider member 16 moves in the right direction in the figure.
Further, in front of the slider member 16, a collet (two or three) chuck body 20 that presses and fixes the core is press-fitted and fixed. A chuck ring 21 that opens and closes the chuck body 20 is surrounded in front of the chuck body 20. Reference numeral 22 is an elastic member such as a coil spring that urges the chuck body 20 and the slider member 16 upward in the drawing and closes the chuck body 20 to hold the core. Reference numeral 23 denotes a tip member that is detachably attached to the front of the shaft tube 1, and inside the tip member 23, a lead made of a rubber-like material that holds the lead lightly and restricts the retraction of the lead. A detent member 24 is disposed. Reference numeral 25 denotes a grip disposed in front of the knock piece 2 and disposed in the middle portion of the shaft tube 1. In this example, the grip is made of a rubber material and is attached to the surface of the shaft 1. You may form integrally, such as giving a knurling process or a satin processing.
Further, a plurality of recesses 26 are formed at the top of the knock piece 2. Then, the ground processing is given without the bottom surface of the recess 26. By finishing the concave portion 26, a difference from the gloss on the surface portion of the knock piece 2 is generated, so that the design is improved and the durability is improved as compared with printing or the like.

Next, an operation example will be described. The shaft tube 1 is picked with one finger, the rear end collar 14 of the rod-shaped body guide member 9 is picked with the other finger, and they are rotated relatively. By the relative rotation operation, the eraser 13 appears and disappears from the rear end collar 14 as described above. At this time, rotation also acts on the outer shaft 4, but since the insertion portion 5 of the outer shaft 1 is fitted into the engaging tube 8 of the shaft tube 1, the outer shaft 4 and the shaft tube 1 The relative rotation of is prevented. Further, in addition to the fitting action between the outer shaft 4 and the shaft tube 1, the outer edge 4 a and the engaging surface 6 c of the projecting portion 6 and the outer edge portion 7 a and the engaging surface 7 c of the groove portion 7 are also connected to the outer shaft 4. Relative rotation with the shaft cylinder 1 is prevented. In particular, the engagement surfaces 6c and 7c are in contact with each other in a direction perpendicular to the direction in which the rotational action occurs, so that the relative rotation between the shaft tube 1 and the outer shaft 4 is further prevented. It is supposed to be.
That is, the position of the clip 15 and the knock piece 2 in this example is always at a fixed position not only when the outer shaft 4 and the shaft cylinder 1 are assembled, but also when the rod-like body feeding device 3 is operated. It can be positioned in the. As a result, good writing can be obtained.

The side view which shows one example. The exploded view of FIG. The longitudinal half sectional view of FIG. The principal part external view of FIG. The front view of FIG. FIG. 6 is a longitudinal half sectional view of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Knock piece 3 Eraser feeding mechanism 4 Outer shaft 5 Insertion part 6 Protrusion part 6a Outer edge part 6b Notch part 6c Engagement surface 7 Groove part 7a Outer edge part 7b Notch part 7c Engagement surface 8 Engagement cylinder part 9 Rod-shaped body guide member 10 Slit 11 Rod-shaped body receiving member 12 Protrusion 13 Eraser 14 Rear end cylindrical portion 15 Clip 16 Slider member 17 Inclined surface 18 Window hole 19 Pressing portion 20 Chuck body 21 Chuck ring 22 Repelling member 23 Tip member 24 Core return Stop member 25 Grip 26 Recess

Claims (4)

A shaft-shaft connection structure, wherein an end portion of one shaft is formed with a protruding portion whose outer edge is curved, and the one protruding portion is fitted into the other shaft, and the protrusion A shaft connecting structure characterized in that a groove portion having substantially the same shape as the portion is formed , and a rod-like body feeding device is disposed on any one of the shafts . A shaft-shaft connection structure, wherein an end portion of one shaft is formed with a protruding portion whose outer edge is curved, and the one protruding portion is fitted into the other shaft, and the protrusion And a clip is provided on the outer peripheral portion of one of the shafts, a core feeding mechanism is disposed on the other shaft, and an operation portion of the core feeding mechanism is provided. A shaft connection structure characterized by being provided on a side wall of the shaft. A shaft-shaft connection structure, wherein an end portion of one shaft is formed with a protruding portion whose outer edge is curved, and the one protruding portion is fitted into the other shaft, and the protrusion A groove that has the same shape as the part is formed , a rod-like body feeding device is arranged on the one shaft, a clip is provided on the outer periphery of the shaft, and a core feeding mechanism is arranged on the other shaft In addition, the shaft coupling structure is characterized in that the operation portion of the core feeding mechanism is provided on the side wall of the shaft. The shaft connecting structure according to any one of claims 1 to 3, wherein the protrusion and the groove are formed in a section of 180 degrees with respect to a circumferential direction of the shaft.

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