JPH069984U - Mechanical pencil chuck set - Google Patents

Abstract

(57) [Summary] [Purpose] Not only the feeding of the lead being written by the lead fixing chuck, but also the feeding of the second and subsequent lead following the lead being written, and the feeding of a completely new lead. (EN) It is possible to provide a chuck set of a mechanical pencil that does not require a knocking operation because it can be performed only by an operation of moving a finger body or the tip of a brush forward and backward. [Structure] A core fixing chuck 2, a chuck case 5 for accommodating the core fixing chuck 2 in a state in which the core fixing chuck 2 is retracted and urged backward by a spring 4, and a front end of the chuck case 5 is movably arranged in a front-rear direction. In the chuck set whose main element is the sliding body 7 which is urged forward by the expansion spring 6 which is stronger in resilience than the pull-in spring 4 in conjunction with the lead fixing chuck 2, when moving forward, A slit 24 is provided in the cylindrical portion 23 projecting from the core gripping portion 19 at the front end, and a projecting piece 25 projecting at the rear end of the sliding body 7 is axially movably inserted, and a front end portion 59 of the slit 24 is provided.
The projecting piece 25 is brought into contact with and is urged forward by the expanding spring 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, when the core is worn out during writing, the touching finger extending body arranged at the tip of the shaft is gently pulled backward with the fingertip and released while keeping the writing state. The present invention relates to a structure of a mechanical pencil chuck set that allows a required amount of lead to be drawn out, and a mechanical pencil chuck set that allows the lead to be drawn out by returning the tip of the brush that retracts as the lead wears.

[0002]

[Prior art]

 This type of conventional mechanical pencil has a knock body attached to the rear end of the barrel, and only when the lead is gripped by the lead-fixing chuck, the lead-out body and the tip of the writing brush are moved forward and backward. In other cases, for example, when feeding the second and subsequent lead that follows the lead being written, or when feeding a completely new lead, it is necessary to press the knocking body and cause the lead fixing chuck to hold the lead. In addition, when the lead is returned to the shaft after the writing is finished, it is also necessary to press the knocking body to open the lead fixing chuck, so that the operation is extremely troublesome.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention not only extends the lead being drawn while being held by the lead fixing chuck, but also extends the second and subsequent lead that follows the lead being written, and the lead-out of a completely new lead. An object of the present invention is to provide a mechanical pencil chuck set that can be operated by the body or moved forward and backward of the tip of the writing brush, thereby eliminating the need for knocking operation and thus improving the usability by simplifying the operation.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the chuck set of the mechanical pencil of the present invention exerts a core fixing force, but a small amount of force can be applied to the lead 1 with respect to the lead 1 to pull it out forward. And a chuck case 5 that is mounted inside the shaft cylinder 3 so as to be movable in the front-rear direction and that accommodates the lead-fixing chuck 2 therein with a spring 4 urging the lead-fixed chuck 2 backward, and a front end of the chuck case 5. It is arranged so as to be movable in the front-rear direction, locked so as to interlock with the core fixing chuck 2 so as to be interlocked during forward movement, and is urged forward by the expansion spring 6 having a stronger elastic force than the pull-in spring 4 described above. In a chuck set whose main element is the sliding body 7 that normally pulls out the lead-fixing chuck 2 to the front side and expands it, the lead-fixing chuck 2 is integrated by combining two symmetrical parts. A ball 21 fitted in a recess 20 formed on the outer surface of the tip gripping portion 19 is sandwiched between the ball 21 and the taper portion 18 on the inner surface of the front end of the chuck case 5, and a slit is formed in a cylindrical portion 23 projecting from the tip gripping portion 19. A projecting piece 25 provided with 24 and projecting at the rear end of the sliding body 7 is movably inserted in the axial direction, and the projecting piece 25 is brought into contact with the front end portion 59 of the slit 24 and is attached forward by the expansion spring 6. It is characterized by having a force.

[0005]

【Example】

 Hereinafter, the illustrated embodiment will be described in detail. First, the shaft cylinder 3 is attached or integrally molded with an elastic rubber or resin rubber body on the outer periphery. Further, a rear shaft 47 is detachably screwed to the rear end of the barrel 3 (in the drawing, the lower side is the front side and the upper side is the rear side), and an eraser 65 is sandwiched at the rear end of the rear shaft 47. An eraser stopper 64 is attached and a cover 63 is detachably arranged. Further, a mouthpiece 9 is screwed to the front end of the shaft cylinder 3, a chuck set 13 described later is housed therein, and a clutch mechanism 54 described later is connected to the front end of the rear shaft 47 screwed to the rear end of the shaft cylinder 3. Is provided, and a partition wall 15 having a small hole 14 in the center through which only one core can pass and a rear surface having a serpentine shape is provided, and an inner space behind the partition wall 15 is used for core storage. A chuck receiver 17 is provided on the front surface of the rear shaft 47 or the clutch mechanism 54 so as to contact the rear end of the fixed core chuck 2.

The chuck set 13 housed in the shaft cylinder 3 is housed in the chuck case 5, which has a tapered portion 18 on the inner surface of the front end thereof and is movable in the front-rear direction with respect to the shaft cylinder 3, and the chuck case. Core fixing chuck 2, a retracting spring 4 for urging the core fixing chuck 2 rearward, a ball 21 fitted in a recess 20 formed on the outer surface of the core gripping portion 19 of the core fixing chuck 2, A stopper 27 fixed to the front end hole of the chuck case 5 to prevent the ball 21 from coming off, a tubular sliding body 7 movably arranged in the front and rear direction at the front end of the chuck case 5, and a spring more elastic than the retracting spring 4. It is composed of an expansion spring 6 that is strong in force and urges the sliding body 7 forward, and a locking tube 60 that secures the chuck case 5 to the rear and movably fits the sliding body 7 to the front. There is.

Further, as shown in FIG. 3, the core fixing chuck 2 is formed into a cylindrical shape by combining two symmetrical parts, and a retaining ring 33 is fixedly attached to a cylindrical portion 69 at the rear end to be integrated. As described above, the cylindrical portion 23 is provided at the front end of the lead fixing chuck 2, and the front end portion 59 is provided by forming the slit 24 on the outer surface thereof. A protruding piece 25 protruding from the rear end of the cylindrical portion 22 of the sliding body 7 is inserted into the slit 24, and the expansion spring 6 is urged between the front surface of the stopper 27 and the sliding body 7. . Further, since the front surface of the projecting piece 25 has an inclination 26 and abuts on the front end portion 59, it serves to surely expand the lead fixing chuck 2. Therefore, when the sliding body 7 advances, the lead fixing chuck 2 also moves forward together, but when the sliding body 7 retreats, the lead fixing chuck 2 independently retracts by the force of the retracting spring 4. The slide body 7 is prevented from being pulled out by a step portion 70 provided on the inner surface of the front end of the locking cylinder 60.

Further, as shown in FIG. 5, the locking cylinder 60 has an appropriate slit 66 formed in front of the side surface thereof, a circumferential groove 29 is formed substantially at the outer periphery of the front end, and an O-shaped elastic member is formed in the groove 29. The ring 28 is fitted. Further, a taper 67 is provided in the inner hole of the front end and a step portion 32 is provided at the rear end thereof so that the taper 67 and the step portion 32 can be elastically expanded. Further, the cylindrical portion 30 provided at the front end of the sliding body 7 has a step portion 31 and is provided with a large diameter portion 30a and a slightly thin small diameter portion 30b, and the large diameter portion 30a is the step of the locking cylinder 60. Located in part 32. Further, the chuck set 13 is biased forward by a return spring 8 interposed between the rear surface of the flange portion 39 at the rear portion of the chuck case 5 and the front end of the shaft portion 48 of the rear shaft 47, and the locking cylinder is held. 60 The taper 67 at the front end abuts on the circumferential projection 68 provided at the front end of the inner bore of the shaft cylinder 3 to appropriately widen the step 32 so that the large-diameter portion 30a of the sliding body 7 is fitted and is moved forward. Is regulated. The return spring 8 has a stronger elastic force than the expansion spring 6. The core fixing chuck 2 exerts sufficient core fixing force to withstand the force pushing the core 1 backward, but when pulling out the core 1 forward, it is smaller than the core fixing force of the tip core gripping chuck 10 described later. It is possible by force.

The base 9 screwed to the front end of the barrel 3 has a notch 34. Further, a tip core gripping chuck 10 is housed inside the mouthpiece 9 so as to be movable in the front-rear direction and biased rearward by a tip retracting spring 37. Further, a tightening ring 43 for tightening the head of the tip core gripping chuck 10 is fixed to the front end of the mouthpiece 9, and an elastic ring 42 is fixed to the shaft behind the head of the tip core gripping chuck 10. A force for frictionally holding the lead is applied when the tip lead holding chuck 10 advances. Further, the tip gripping chuck 10 elastically generates a sufficient core fixing force capable of withstanding the writing pressure, that is, the force pushing the core 1 backward, but the core fixing chuck 2 described above When paying out, the lead 1 can be moved forward.

Further, inside the mouthpiece 9, a feeler feeding body 12 is arranged behind the tip core gripping chuck 10 and in front of the chuck set 13 so as to be movable in the front-rear direction. The finger-feeding body 12 is composed of a central tube portion 35 housed inside the mouthpiece 9, an arm piece portion 36 penetrating the notch 34 of the mouthpiece 9, and a finger operation portion 11 exposed on the outer periphery of the mouthpiece 9. The arm piece portion 36 can move back and forth in the notch 34 without any restriction. Further, the reinforcing ring 46 is fixed to the rear end hole of the mouthpiece 9 to suppress the elastic deformation of the screw portion at the rear end of the mouthpiece 9 due to the notch 34, and to prevent the touching finger feeding body 12 from coming off. The front portion of the guide pipe 41 to which the fixing ring 40 is fixed is fixed to the hole of the central tubular portion 35 of the, and the tip of the guide pipe 41 is tightly fitted into the rear end hole of the tip core holding chuck 10 in a freely slidable state. Then, the base 9 is screwed onto the front end of the barrel 3. At that time, the front surface of the fixed ring 40 is brought into contact with the rear surface of the central cylindrical portion 35, and the rear surface of the fixed ring 40 is brought into contact with the front end of the cylindrical portion 30 of the sliding body 7. The rear portion of the guide pipe 41 is tightly fitted in the hole of the tubular portion 30 of the sliding body 7 in a freely slidable state. The central tubular portion 35, the fixed ring 40, and the small-diameter portion 30b of the sliding body 7 are tightly fitted inside the reinforcing ring in a freely slidable state.

By the way, a hole portion 49 communicating with the small hole 14 is provided at the center of the shaft portion 48 at the front end of the rear shaft 47, and a taper portion 50 is formed at the rear of the hole portion 49 as well as a ball portion. The ball 51 is fitted into the guide 55, and the ball guide 55 is fixed to the hole 49 to form the clutch mechanism 54. The basic structure of the clutch mechanism 54 will be described with reference to FIG. Recessed grooves 56 for guiding the ball 51 are provided at three positions behind the ball guide 55, and the ball 51 is enclosed so as to be centered by a tapered part 50 formed behind the hole 49. If necessary, one or two balls are provided in each groove. First, in the state where the lead fixing chuck 2 side is on the lower side, the ball 51 is positioned at A, and the built-in lead 61 can drop by its own weight. When the core fixing chuck 2 side is the upper side, the ball 51 slides on the taper portion 50 to move, and is centered to hold the core. That is, the lead is inserted only when the lead fixing chuck 2 side faces downward. As shown in FIG. 1, a guide pipe 53 is fixed in front of the ball guide 55, and the front portion of the guide pipe 53 is closely and freely slidable in the hole 52 at the rear end of the core fixing chuck 2. I am wearing it.

When the touching finger feeding body 12 is retracted from the state of FIGS. 1 and 7 and the sliding body 7 is retracted by α in conjunction with it, as shown in FIG. Since the chuck 2 is retracted by the pull-in spring 4, the ball gripping portion 19 is closed by gripping the ball 21 sliding on the taper portion 18, and the core 1 is gripped. The chuck set 13 is prevented from moving backward by the urging force of the return spring 8. Further, the large diameter portion 30a is retracted in the tubular portion 30 of the sliding body 7 so that the step portion 31 is locked to the rear end of the step portion 32 of the locking tube 60. Further, when the finger-feeding body 12 is further retracted, the rear surface of the protruding piece 25 of the sliding body 7 contacts the front surface of the stopper 27 to retract the chuck set 13. At that time, since the lead 1 is held and fixed by the tip lead gripping chuck 10, the lead gripping portion 19 of the lead fixing chuck 2 slides back on the outer surface of the lead 1. As shown in FIG. 9, the chuck set 13 is retracted until the rear end of the finger-feeding body 12 comes into contact with the stepped portion 71 of the shaft tube 3, at which time the rear end of the lead fixing chuck 2 shown in FIG. The lead fixing chuck 2 is brought into contact with the scale 17 to push the lead fixing chuck 2 forward so that the lead gripping portion 19 of the lead fixing chuck 2 is expanded and the lead is freely inserted.

In the state shown in FIG. 1, when the tip of the lead 1 during writing is worn and the lead 1 is fed out by a necessary amount, first, the fingertip is applied to the touching finger operating portion 11 and pulled gently backward to pull out the touching finger feeding body 12. To retire. When the finger-feeding body 12 pushes the sliding body 7 and retracts it as described above, the lead fixing chuck 2 also retracts by the force of the retracting spring 4 and grips and fixes the lead 1. Further, when the touching-out body 12 is retracted and the retracted amount of the sliding body 7 becomes α, the step portion 31 of the sliding body 7 engages with the rear end of the step portion 32 of the locking cylinder 60. When the touching-out body 12 is further retracted, the rear surface of the protruding piece 25 of the sliding body 7 contacts the front surface of the stopper 27 to retract the chuck set 13. At this time, the lead fixing chuck 2 holds the lead 1, but at the same time, the tip lead gripping chuck 10 also holds the lead 1 so that the lead 1 is pulled out to the front so that the lead fixing chuck 2 holds the lead 1. Sliding to the rear position of 1. When the finger-feeding body 12 is retracted to an appropriate position and then the finger is released, the chuck set 13 and the finger-feeding body 12 are moved forward by the force of the return spring 8. When the arm piece portion 36 of the finger-feeding body 12 is moving forward in the notch 34 of the mouthpiece 9, the sliding body 7 expands the step portion 31 and the rear end of the step portion 32 of the locking cylinder 60. Since the sliding body 7 is locked by a force stronger than that of the opening spring 6, the sliding body 7 maintains the retracted state and the lead fixing chuck 2 also holds the lead 1, so that the lead 1 is moved forward and the lead 1 is moved. It is fed forward. As shown in FIG. 10, when the taper 67 at the front end of the locking cylinder 60 comes into contact with the projection 68 at the front end inside the shaft cylinder 3 and advances, the front end of the locking cylinder 60 elastically expands to form a step with the step 31. The engagement with the rear end of the portion 32 is released, and the sliding body 7 advances to the state shown in FIG.

When the lead 1 during writing is exhausted and the tip of the second lead 1 that follows is advanced to the position immediately after the lead gripping portion 19 of the lead fixing chuck 2, the touch-feeding body 12 is retracted. When the second core 61 is gripped with the sliding body 7 retracted by α as described above, and the finger feed body 12 is further retracted to retract the chuck set 13, in this case, the second core 1 is moved to the above-mentioned position. As described above, since the lead 1 is not fixed by the tip core gripping chuck 10, the lead 1 is conveyed rearward by the lead fixing chuck 2, but the touching-out body 12 is further retracted to move the lead fixing chuck 2 shown in FIG. When the rear end is brought into contact with the front end of the chuck receiver 17 and the touch finger feeding body 12 is further retracted to the limit as shown in FIG. 9, the lead fixing chuck 2 does not retract but only the chuck case 5 retracts. Wick fixing chuck 2 is widened a form of relatively advanced, the core 61 is moved forward by natural falling so opening the core 61. After that, when the finger is released from the touching finger feeding body 12, the chuck case 5 is moved forward by the force of the return spring 8 and the lead fixing chuck 2 removes the lead 61 with the second lead 61 contacting the rear end of the lead 1. You will be holding. When the chuck case 5 further advances together with the locking cylinder 60, the second core 61 is pushed by the core fixing chuck 2 in the same manner as described above, and the rear end of the first core 1 is gripped by the core fixing chuck 2. Even if the length is not reached, it is pushed out by the second core 1 and fed out. The amount of extension of the lead 1 at this time is a stroke in which the rear end of the lead fixing chuck comes into contact with the chuck receiver 17 and is further pushed to release the grip of the lead 61. It has a size similar to the clearance β between the rear end of the fixed core chuck 2 and the chuck receiver 17 shown in FIG.

Since the first lead 1 is pushed out by the second lead 1 as described above and is grasped by the tip core grasping chuck 10, it is possible to write until it is ejected from the tip core grasping chuck 10. Is. Also, if there is no lead 1 in the shaft and a newly supplied lead 1 is to be immediately projected from the tip core gripping chuck 10 to start writing, or if the core 1 protruding from the tip core gripping chuck 10 is placed in the shaft. When returning, the touching finger feeding body 12 is lightly pushed forward by the fingertip, the front end of the touching finger feeding body 12 is brought into contact with the rear end of the tip core gripping chuck 10, and the tip core gripping chuck 10 is pushed forward. To spread. Since the lead fixing chuck 2 is normally expanded, there is nothing for fixing the lead 1, and the lead 1 can be projected from the tip lead gripping chuck 10 by free fall. It can be immersed in the shaft by pressing the tip with the paper surface.

In the embodiment of the present invention, the structure in which the touching finger feeding body arranged at the tip of the shaft as the lead feeding means is lightly pulled by the fingertip and released is shown. It is also possible to configure the body and the chuck set in conjunction with each other.

[0017]

[Action]

 The core 1 being written can be grasped and extended by the core grasping chuck 2 by an operation of gently pulling the touching finger operating portion 11 of the touching finger feeding body 12 rearward with a fingertip and then releasing it.

When the lead fixing chuck 2 is brought into contact with the chuck receiver 17 by the touching finger extending body 12 and is retracted until it is expanded, and then the finger is released from the touching finger extending body 12, when the core 1 during writing is exhausted. The second lead 1 following the lead can be gripped and extended by the lead fixing chuck 2.

Since the lead 1 during writing is fixed by the tip core gripping chuck 10 with a force capable of withstanding the writing pressure, it is possible to write until it is pushed out from the tip core gripping chuck 10.

When the finger-feeding body 12 is pushed forward by the fingertip, the finger-feeding body 12 contacts the tip core gripping chuck 10, and the tip core gripping chuck 10 is pushed forward and spreads. Since the lead fixing chuck 2 is normally expanded, the lead 1 is completely free, and if the tip of the lead 1 is pressed against the paper surface or the like, the lead 1 is retracted into the shaft.

By providing the clutch mechanism 54 at the rear of the chuck set 13, the built-in lead 61 in the lead storage unit 16 can be inserted only when the writing tip is facing downward, and even when the writing tip is facing upward, the second lead 61 is It is possible to hold the first core 1 at a position where it is substantially in contact with the rear end of the first core 1, and the core can be fed out without any trouble.

[0022]

[Effect of device]

 The present invention is as described above, and when the core is worn out during writing, the necessary amount of the core can be adjusted by operating the touching-out body or the sliding body that moves back and forth with the writing tip while maintaining the writing state. Of course, the present invention can be extended, but in the present invention, especially when the core during writing is exhausted and the second core that follows it is extended, or when a completely new core is extended, a core that protrudes after writing is completed is used. Even when it is returned to the inside, it does not require the operation of pressing the knock body arranged at the rear end of the shaft as in the past, but it can be simply performed by operating the touching-out body or the sliding body provided at the tip of the brush. There is an effect that it can be extended. Further, it is excellent in that the projecting piece 25 of the sliding body 7 can be easily assembled in the slit 24 of the lead fixing chuck 2 by utilizing mutual elastic displacement.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a normal state in which a finger-feeding body is not moved.

FIG. 2 is a vertical cross-sectional view showing an entire touch-fing mechanical pencil according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a lead fixing chuck.

FIG. 4 is a perspective view showing an appearance of a sliding body.

FIG. 5 is a perspective view showing a configuration of a locking cylinder.

FIG. 6 is an explanatory diagram showing a configuration of a clutch mechanism.

7 is a cross-sectional view of a main part corresponding to FIG.

FIG. 8 is a cross-sectional view of a main part showing a state immediately before the sliding of the touching finger retraction body, the lead fixing chuck grips the lead, and the sliding body is retracted and locked by the locking cylinder.

FIG. 9 is a cross-sectional view of essential parts in a state in which the touching finger feeding body is retracted to a position just before a limit.

FIG. 10 is a cross-sectional view of an essential part showing a state just before the sliding of the sliding body and the locking cylinder is released by advancing the touching finger feeding body.

[Explanation of symbols]

 1 core 2 core fixed chuck 3 shaft cylinder 4 pull-in spring 5 chuck case 6 expansion spring 7 sliding body 8 return spring 9 mouthpiece 10 tip core gripping chuck 11 touching finger operating part 12 touching finger feeding body 13 chuck set 14 small hole 15 partition Wall 16 Core storage section 17 Chuck receiving section 18 Taper section 19 Core gripping section 20 Recess 21 Ball 22 Tube section 23 Tube section 24 Slit 25 Projecting piece 26 Inclination 27 Stopper 28 O-ring 29 Groove 30 Tube section 30a Large diameter section 30b Small diameter Part 31 Step part 32 Step part 33 Stop ring 34 Notch 35 Center tube part 36 Arm piece part 37 Retracting spring 38 Rubber body 39 Flange part 40 Fixing ring 41 Guide pipe 42 Elastic ring 43 Tightening ring 44 Inner hole part 45 Inner hole part 46 Reinforcement ring 47 Rear shaft 48 Shaft part 49 Hole 50 Taper 51 Ball 52 Hole 53 Guide pipe 54 Clutch mechanism 55 Ball guide 56 Recessed groove 57 Gap 58 Inner step 59 Front end 60 Locking tube 61 Built-in core 62 Clip 63 Cover 64 Eraser stopper 65 Eraser 66 Slit 67 Taper 68 Projection 69 Tube 70 Step 71 Step

Claims (1)

[Scope of utility model registration request] 1. A lead fixing chuck 2 that exerts a lead fixing force, but makes it possible to pull the lead 1 forward with respect to the lead 1, and is movable in the longitudinal direction inside a barrel 3. A chuck case 5 which is mounted and accommodates the lead-fixing chuck 2 inside thereof with the spring 4 being biased rearward, and a lead-fixing chuck 2 which is disposed at the front end of the chuck case 5 so as to be movable in the front-rear direction. On the other hand, it is locked so as to be interlocked during forward movement, and is urged forward by the expansion spring 6 having a larger elastic force than the retracting spring 4, and normally the lead-fixing chuck 2 is pulled forward to bring it into an expanded state. In a chuck set having the moving body 7 as a main element, the core fixing chuck 2 is integrated by combining two symmetrical parts, and the recess 2 formed on the outer surface of the core gripping portion 19 at the tip end.
The ball 21 fitted in 0 is sandwiched between the inner surface of the chuck case 5 and the taper portion 18 on the inner surface of the front end of the chuck case 5, and the slit 24 is provided in the tubular portion 23 projecting from the core gripping portion 19 and projecting at the rear end of the sliding body 7. The mechanical pencil chuck set is characterized in that the projecting piece 25 is inserted movably in the axial direction, the projecting piece 25 is brought into contact with the front end portion 59 of the slit 24, and is biased forward by the expansion spring 6.