JPH061434Y2 - Sharp pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement in portability of a mechanical pencil that allows a lead to be drawn out by a fingertip operation without a knocking operation.

(Prior Art) A chuck set using a ball chuck or the like which has a sufficient core fixing force against the writing pressure but has a characteristic that enables it with a relatively small force for pulling out the lead to the front. At the front position, a holding chuck having a lead fixing force capable of pulling out the lead held by the chuck set is arranged movably in the axial direction, and the touching finger operation member movable in the axial direction and the holding chuck described above are interlocked with each other. A mechanical pencil in which a lead is pulled out from a chuck set by a holding chuck by moving a touch operation member in the axial direction and the lead can be fed out by an amount of advance of the holding chuck, a so-called finger-operated mechanical pencil is known. However, conventionally, in such a mechanical pencil, the tip core pipe is integrally fixed to the mouthpiece or the above-mentioned touching finger operation member, so that the tip core pipe can be carried while being carried. It was extremely dangerous because it kept protruding. To eliminate such a danger, there is a method of fitting a cap covering the tip core pipe, but it is not practical because it is troublesome to attach and detach the cap and the cap may be lost.

(Problems to be solved by the invention) Therefore, according to the present invention, the core can be extended by operating the fingertips without relying on the knocking operation, and in addition, the tip core pipe can be immersed when carrying. The purpose is to provide a mechanical pencil that is extremely safe to carry.

(Means for Solving the Problems) In order to achieve the above object, a mechanical pencil according to the present invention has a sufficient core fixing force against a writing pressure, but it is relatively easy to pull out the core forward. Set (1)
The base (11) is fastened to the front end of the barrel (10) that houses the slider, and the slider (4) is axially movable in the base and spring.
(3) is stored in a state of being urged forward, and the slider (4) is integrally attached with a holding chuck (2) having a lead fixing force capable of pulling the lead forward from the chuck set (1). The rear end of the tip core pipe (6) penetrating the base (11) is integrally fixed to the slider (4), and the engaging portion (5) is provided at the front part of the base (11) in the tip core pipe (6). On the other hand, a finger touch operation member that is movable in the axial direction and has the finger hook (7) exposed to the outside
A step portion that abuts on the engaging portion (5) of the tip core pipe (6) on the (8) and pushes the engaging portion (5) backward when the touch operation member (8) retracts.
(9) is provided, and when the tip core pipe (6) is retracted so that its front end is in a non-projecting state, the engaging portion (5) of the tip core pipe (6)
To lock the tip core pipe (6) in the fixed state (1
4) is provided at the front end of the base (11).

(Function) First, the holding chuck (2), the slider (4), and the tip core pipe.
A tactile finger operation member (8) in which (6) is integrated to provide an engaging portion (5) on the tip core pipe (6), and the finger hook portion (7) is exposed to the outside so as to be movable in the axial direction. On the tip of the core pipe (6) engaging part (5)
Since it has a configuration in which a step portion (9) that comes into contact with the touch operation member (8) and pushes the engagement portion (5) backward when the touch operation member (8) is retracted is provided, from the state shown in FIG. When the fingertip operation member (8) is pulled backward with the fingertip on (7), the stepped portion (9) of the touch operation member (8) presses the engaging portion (5) and the tip core pipe (6). Will move backwards,
The slider (4) and the holding chuck (2) also retreat together while compressing the spring (3), and the holding chuck (2) holds the rear part of the core (see FIG. 2).
In this state, if you release your finger from the touch operation member (8), the restoring force of the spring (3) will cause the holding chuck (2) and slider to move.
(4), the tip core pipe (6), and the finger operation member (8) are integrally advanced to return to the state of FIG. 1, and at this time, the chuck set (1 ), The core is pulled out, and the core is paid out by the amount of advance of the holding chuck (2).

Next, when carrying, in the state shown in FIG. 1, knock the rear end knocking member (not shown) to open the chuck set (1) and loosen the core, and remove the front end of the core pipe (6). When the front end of the tip core pipe (6) is moved backward by pressing it against the paper surface, etc. until the front end of the tip core pipe (6) does not project, the engaging part (5)
Reaches the locking portion (14) of the base (11) and is locked to fix the tip core pipe (6) (see FIG. 3). When projecting the front end of the tip core pipe (6) from this state and returning it to the state shown in Fig. 1 again, knock the rear end knock member and move the slider (4) forward by the chuck set (1). The engaging portion (5) may be pushed out from the locking portion (14) by pushing to.

(Example) An example will be described with reference to the drawings.

First, a chuck set (1) is mounted inside the barrel (10), and this chuck set (1) has a sufficient core fixing force for writing pressure, but pulls the core forward. For this, a chuck having a characteristic that enables it with a relatively small force, such as a ball chuck, is used.
A base (11) is screwed onto the front end of the barrel (10).
A slider (4) is housed in the inner hole of (1) so as to be movable back and forth in the axial direction. The slider (4) has a flange portion (4a) on the outer surface of the front end, and is interposed between the retaining mailing (12) press-fitted and fixed to the rear end of the inner hole of the mouthpiece (11) and the flange portion (4a). It is urged forward by a mounted spring (3). Slider (4)
A holding chuck (2) is integrally attached to the front of the chuck set (1) with its center line aligned. The holding chuck (2) has a core fixing force capable of pulling out the core from the chuck set (1). The tip core pipe (6) is integrally fixed to the slider (4) at its rear end with the center line thereof aligned with the holding chuck (2). The tip core pipe (6) penetrates the base (11) and protrudes forward, and a tubular member is fitted to the outer surface portion at a position somewhat rearward from the front end to form an engaging portion (5).

The tip core pipe (6) may be provided with a protrusion or a ridge as an engaging portion. Base (11) and tip core pipe (6)
A finger operation member (8) is fitted on the outer peripheral part of the tip core pipe (6), and the front end portion of the tip core pipe (6) extends forward of the finger operation member (8).
The engaging portion (5) is located inside the finger operation member (8). The touch finger operation member (8) has a finger hook portion (7) on the outer surface of the rear end, and an axial groove (13) at a required position in the circumferential direction on the inner surface of the rear end.
A protrusion (11b) arranged at a required position in the circumferential direction on the outer peripheral edge of the flange (11a) provided on the outer surface of the base (11) is provided with this groove (1
It is fitted in 3) and is attached to the mouthpiece (11) so that it cannot rotate in the circumferential direction and can move a predetermined stroke in the axial direction.

In addition, a protrusion (13a) is provided at the rear end position of the groove (13) to prevent it from coming off. The reason why the touch operation member (8) and the mouthpiece (11) cannot be rotated is that the mouthpiece (11) can be attached to and detached from the barrel (1). On the other hand, on the inner surface of the front end of the touch operation member (8), a step (9) is provided at a position where it abuts on the front end of the engaging part (5). Further, at the front end of the base (11), the tip core pipe (6)
A cylindrical lock that engages with the engaging part (5) provided on the tip core pipe (6) and locks with the front end retracted until it coincides with the front end of the touch operation member (8). The part (14) is projected. The locking force of the locking portion (14) is set to be larger than the force of the spring (3), and thus the tip core pipe (6) is fixed. In this state, the dimensions are set so that the rear end of the slider (4) is located at a point where it substantially contacts the front end of the chuck set (1). In addition, the tactile finger operating member in the state of FIG.
In order to prevent the rattling of (8), the sliding part (15) of the finger operation member (8) and the tip core pipe (6) is provided with an appropriate friction resistance, or the finger operation member (8) and the mouthpiece You may take measures such as stretching the second spring between (11).

(Effects of the Invention) The present invention is as described above, and the core can be extended by operating a fingertip, and the tip of the tip core pipe can be safely carried with the tip of the tip pipe not protruding.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a normal state, FIG. 2 is a vertical cross-sectional view of a state in which a finger operation member is retracted to extend a lead, and FIG. 3 is a vertical cross-section of a state in which a tip core pipe is carried in a non-protruding state. Figure,
FIG. 4 is a cross-sectional view taken along the line AA in FIG. (1) ... Chuck set, (2) ... Holding chuck, (3) ... Spring, (4) ... Slider, (5) ... Engagement part, (6) ... Tip core pipe, (7) ... Finger hook part, (8) ... Tactile operating member, (9) ... step portion, (10) ... shaft cylinder, (11) ... base, (14) ... locking portion.

Claims (1)

[Scope of utility model registration request] 1. A chuck set which has a sufficient core fixing force against writing pressure but is relatively easy to pull out the core forward.
With the base (11) fixed to the front end of the barrel (10) containing (1), the slider (4) is axially movable inside the base and biased forward by the spring (3). Store and Slider (4)
A holding chuck (2) having a core fixing force capable of pulling the core forward from the chuck set (1) is integrally mounted on the slider, and the rear end of the tip core pipe (6) penetrating the base (11) is attached to a slider. It is integrally fixed to (4), the engaging part (5) is provided in the front part of the mouthpiece (11) in the tip core pipe (6), while the axially movable finger hook part (7) is external. The touching finger operating member (8) exposed to the abutment is brought into contact with the engaging portion (5) of the tip core pipe (6) and the engaging portion (5) is pushed backward when the touching finger operating member (8) is retracted. The stepped portion (9) is provided, and when the tip core pipe (6) is retracted and its front end is in a non-protruding state, the engagement portion (5) of the tip core pipe (6) is locked to the tip. A mechanical pencil characterized in that a locking portion (14) for fixing the core pipe (6) is provided at the front end of the base (11).