JPH0624225Y2 - Automatic centering device for mechanical pencils - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention can automatically perform center feeding during writing, and
The present invention relates to an automatic centering device for mechanical pencils capable of automatically and smoothly following the second and subsequent subsequent cores.

[Prior Art and Its Problems] Conventionally, various proposals have been made as a mechanical pencil that is automatically fed out according to the amount of wear of the lead, and can be followed by the next lead when one lead is used up. Among them, the chuck is always expanded and dropped by the dead weight of the lead until it comes in contact with the lead detent member or the rear end of the first lead, and when writing, press the tip of the mechanical pencil to There is one that closes the writing pressure and puts it in a writing state, but this is preferable because it can relatively simplify the structure, but when writing, the conventional one does not touch the chuck after pressing the tip. The response until closing was slow, and the core retreated in the initial stage of writing, impairing the feeling of writing.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and its gist is to provide an inner cylinder slidably disposed in a tip metal fixed to the front of a shaft cylinder. A slider provided with a core detent member that is biased forward by a slider spring interposed between the inner cylinder and the tip metal, and is provided inside the shaft cylinder at the rear end contact position of the inner cylinder. At the position where it abuts against and locks the part, a tilting body that can be tilted by retracting the slider and an upright position by canceling the tilt by advancing the chuck is provided so as to be swingable. Is an automatic mechanical pencil, characterized in that it is provided with the chuck which is interlocked with the tilting body through a pressing body slidable on the inner surface of the shaft cylinder and is urged forward by a chuck spring so as to be normally opened. This is a centering device.

[Operation] In the present invention, since the tilting body which can take an inclined posture and an upright posture is arranged between the slider and the chuck, the chuck is retracted only by slightly retracting the core protection tube at the slider tip. It is possible to retreat by several times in conjunction with, and the chuck in the expanded state can be closed quickly and surely.

[Examples] Hereinafter, further details will be described with reference to the accompanying drawings.

In FIG. 1, a tip metal 2 is fixed to the front of a shaft cylinder 1, and inside the metal tip 2, a lead protection tube 3 which exposes a part from the tip of the tip metal 2 and a core detent to the rear. A slider 5 on which the member 4 is arranged is arranged, and the slider 5 is interposed between the slider 5 and an inner cylinder 6 slidably arranged on the outside.
Is urged forward by the front end spring 8 which is weaker in resilience than the slider spring 7 interposed between the tip metal 2 and the inner step surface. Reference numeral 9 is a ring for preventing the inner cylinder 6 from falling when the tip 2 is removed. At the rear end abutting position of the inner cylinder 6, a tilting body 10 on the ring is in an upright posture by fitting a part of the tilting body 10 into a recess 12 formed in the rear portion of the regulating portion 11.
A pressing body 13 slidable in the shaft cylinder 1 is continuously provided behind the tilting body 10 in a state in which the pressing body 13 is biased forward by a chuck spring 14 and is in contact with a chuck 15 having its head expanded. There is. A ball receiving seat 16 is formed on the head of the chuck 15 and a ball 17 is arranged on the head. Further, the outer shaft cylinder 1 of the ball 17 is formed with an inclined guide surface 18 that performs a wedge action with the ball 17. The inclined guide surface 18
Is not necessarily provided on the inner surface of the shaft cylinder 1, and may be separately provided as a ring having an inclined surface.

Next, the operation will be described based on the configuration described above.

In the state shown in FIG. 1, the chuck 15 is repelled forward by the chuck spring 14 and the ball 17 and the inclined guide surface 18 are provided.
Since the wick is expanded by its own expansion force at a position where no wedge action is generated, the core falls to the front of the core detent member 4 due to its own weight. Next, by pressing the tip of the lead protection tube 3 against the paper surface or the like, the slider 5 presses the inner cylinder 6 via the slider spring 7, and the inner cylinder 6 presses the tilting body 10. Here, since the tilting body 10 has a part thereof fitted in the concave portion 12, it tilts with that part as a fulcrum,
The pressing body 13 is pressed, and further the head end contact surface of the chuck 15 is pressed. In this process, the chuck 15 moves backward against the resilience of the chuck spring 14, and the ball 17 and the inclined guide surface. A wedge action is performed with 18 to firmly hold the core (see FIG. 2). Next, when the lead protection tube 3 is further pressed, the slider 5 moves backward against the resilience of the slider spring 7 and the lead detent member 4 is pushed.
Since the lead 15 falls to the front side and the retreat of the lead is restricted by the chuck 15, the lead will also slip inside the lead detent member 4 (see FIG. 3). When the pressing is released here, the chuck 15 moves forward by the chuck spring 14, and the tilting body 10 is brought into contact with the regulating portion 11 via the pressing body 13 to take an upright posture. Further, the slider 5 is returned by the elastic force of the slider spring 7, but at that time, the chuck 1 is expanded again while the lead is retained by the lead detent member 4.
The core is pulled out from 5 (see FIG. 4). By repeating the operations of FIGS. 2 to 4 described above, the lead moves forward until it becomes flush with the lead protection tube 3 and becomes in the writing state. Similarly, even if the first core wears due to writing, the second core follows.

[Advantages of the Invention] According to the present invention, the inner cylinder slidably disposed in the front metal fixed to the front of the shaft cylinder and the slider spring interposed between the inner cylinder and the front metal allow the front to move forward. A slider provided with a core detent member is urged toward the inner cylinder rear end abutting position, and the slider is retracted to a position at which the inner cylinder rear end abutting position abuts and locks against the regulating portion provided in the shaft cylinder. A posture and a tilting body that can release the tilt by the forward movement of the chuck and take an upright posture are swingably provided, and the tilting body is behind the tilting body via a pressing body that can slide on the inner surface of the shaft cylinder. Since the chuck is provided that is interlocked with the body and is urged forward by the chuck spring, and is normally expanded, if the tip of the core protection tube at the slider tip is pressed against the paper surface during writing, the tilting body will tilt. Quickly open the chuck that is expanding through the pressing body, Moreover, it is possible to securely close and pinch the core,
It is possible to provide a responsive mechanical pencil that prevents the core from retreating as much as possible when it is pressed.

[Brief description of drawings]

1 to 4 are sectional views for explaining the operation of the present invention. 1 ... Shaft cylinder, 2 ... Tip metal, 4 ... Core detent member, 5 ...
... Slider, 6 ... Inner cylinder, 7 ... Slider spring, 10 ... Tilting body, 11 ... Regulator, 13 ... Pressing body, 14 ... Chuck spring, 15 ... Chuck

Claims (1)

[Scope of utility model registration request] 1. An inner cylinder slidably disposed in a front metal fixed to the front of a shaft cylinder, and a slider spring interposed between the inner cylinder and the front metal and biased forward by a core return. A slider provided with a stop member is provided, and at the position where the slider contacts the inner cylinder rear end, the slider is retracted and the chuck is moved forward. A tilting body that can be tilted to release the inclination and take an upright posture is swingably provided, and behind the tilting body, a tilting body is interlocked with the tilting body via a pressing body that can slide on the inner surface of the shaft cylinder. An automatic centering device for mechanical pencils, characterized in that it is provided with the chuck which is biased forward by a spring and which is normally opened.