JPH059987U - Sharp pencil - Google Patents

Abstract

(57) [Summary] [Purpose] Simple operation prevents unnecessary lead-out when carrying. [Structure] The weight body 8 is moved forward by shaking the shaft cylinder 2. The chuck 4 is moved forward by the inertial force of the weight body 8 to feed the lead 9. Sliding groove 2 extending in the longitudinal direction on shaft cylinder 2
A is formed, and further, a locking groove 2B that is inclined rearward in the circumferential direction from the front end of the sliding groove 2A is formed. The locking protrusion 10A formed on the sliding member 10 is attached so as to be movable in the sliding groove 2A of the shaft cylinder 2 and locked in the locking groove 2B. Moreover, the sliding member 10 is biased rearward by the return spring 11, and in the writing state in which the locking projection 10A is located in the sliding groove 2A, the sliding member 10 is appropriately separated from the core tank 5 and the core is moved by the chuck 4. Holds 9. Also, in the portable state in which the locking projection 10A is locked in the locking groove 2B, the sliding member 10 presses the lead tank 5 to open the chuck 4, and even if the weight 8 moves the chuck 4 forward. Unnecessary lead-out is not performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanical pencil that prevents the lead from being pulled out unnecessarily by advancing the chuck by the inertial force of a weight body to feed the lead, and by locking the chuck in an expanded state during carrying.

[0002]

[Prior Art]

 Conventionally, as a mechanical pencil to prevent the lead-out when carrying, the operation member protruding from the locking groove of the shaft cylinder is operated to fix the operation member to the shaft cylinder or release the fixation, It is known to prevent the chuck from advancing when it is fixed to the barrel.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned one, the operation of fixing the operation member to the shaft cylinder and the operation of releasing the fixation are troublesome, and the structure for preventing the chuck from advancing by the operation member becomes complicated, which causes various problems in practical use. Was there. An object of the present invention is to provide a mechanical pencil that solves the above problems.

[0004]

[Means for Solving the Problems]

 According to the present invention, a sliding groove extending in the longitudinal direction is formed on the shaft cylinder, and a locking groove inclined rearward in the circumferential direction from the front end of the sliding groove is formed. The locking projection formed on the sliding member is attached so as to be movable in the sliding groove of the shaft cylinder and lockable in the locking groove. The sliding member is biased rearward by a return spring, and in a writing state in which the locking projection is located in the sliding groove, the locking projection is biased to the rear end of the sliding groove, and the sliding member is properly connected to the core tank. It is configured separately. Further, in a portable state in which the locking projection is locked in the locking groove, the sliding member presses the lead tank to expand the chuck, which is a mechanical pencil.

[0005]

【Example】

 1 and 2 show an embodiment of the present invention, in which a barrel 2 is connected to a base 1, and a washer 3 is held between an inner stage 1A of the base 1 and a front end of the barrel 2. A spring 6 is stretched between the washer 3 and the outer stage 5A of the lead tank 5 connected to the chuck 4, and biases the chuck 4 rearward in the longitudinal direction. Therefore, the head 4A of the chuck 4 is pressed against the tightening ring 7 to be closed, and the tightening ring 7 is brought into contact with the washer 3. A weight body 8 is slidably inserted into the cylindrical portion 5B of the lead tank 5, and a spare lead 9 is housed in the lead tank 5. A sliding groove 2A extending in the longitudinal direction is formed in the rear portion of the shaft tube 2, and further a locking groove 2B inclined rearward in the circumferential direction from the front end of the sliding groove 2A is formed. Since the locking projection 10A of the sliding member 10 is movably fitted in the sliding groove 2A and the locking projection 10A is connected to the sliding member 10 by the elastic piece 10B, it can be bent inward. It is configured. However, in a normal writing state, the return spring 11 is stretched between the rear inner step 2C of the shaft cylinder 2 and the outer step 10C of the sliding member 10, and the locking projection 10A is biased to the rear end of the sliding groove 2A. ing. Therefore, the inner collar 10D of the sliding member 10 is appropriately separated from the rear end of the lead tank 5. Further, an eraser 12 is provided on the inner side of the rear portion of the sliding member 10, and a knob 13 is fitted on the outer side of the rear portion of the sliding member 10 so as to cover the eraser 12 with appropriate frictional resistance.

Therefore, in a normal writing state, the lead tank 5 and the chuck 4 can be moved forward by the inertial force of the weight body 8 generated by shaking the shaft cylinder 2 to feed the lead 9. Then, when one lead 9 is completed and the next lead 9 is made to follow, the sliding member 10 is advanced by knocking the knob 13. At this time, the locking projection 10A advances along the sliding groove 2A. Therefore, the inner collar 10D of the sliding member 10 abuts on the rear end of the lead tank 5, and the lead tank 5 and the chuck 4 also move forward so that the lead 9 is followed like the conventional mechanical pencil.

In the case of carrying, the knob 13 is pushed and moved forward, the chuck 4 is expanded, and then the knob 13 is rotated to fit the locking projection 10A into the locking groove 2B of the barrel 2. Therefore, in this carrying state, even if the weight body 8 slides, the lead 4 is not extended because the chuck 4 is expanded. Then, in order to return to the writing state, by simply pressing the knob 13, the locking projection 10A advances along the locking groove 2B and is positioned outside the locking groove 2B in the sliding groove 2A. ..

FIG. 3 shows another embodiment of the present invention in which a slanting surface 110E is formed on a locking projection 110A of a sliding member. Therefore, when the locking projection 110A is disengaged from the locking groove 2B, even if the sliding member cannot reliably rotate to the sliding groove 2A and the locking projection 110A comes into contact with the edge 2D of the sliding groove, the inclined surface 110E Is guided to the sliding groove 2A and can be operated more reliably.

FIG. 4 shows another embodiment of the present invention, in which an inclined surface 102E is formed at an edge where a locking groove 102B formed in the shaft cylinder 102 and a sliding groove 102A are combined. . Also in this case, similarly to the embodiment of FIG. 3, the locking projection 10A is more surely guided to the sliding groove 102A.

[0010]

[Effect of the device]

 In the mechanical pencil of the present invention described above, the locking projection of the sliding member, which is normally located in the sliding groove of the shaft cylinder, is fitted and locked in the locking groove inclined rearward in the circumferential direction of the shaft cylinder when being carried. It is a thing. Therefore, it is possible to prevent unnecessary lead-out when the mobile phone is carried with a simple structure. Moreover, in order to return to the writing state, simply pushing the sliding member forward in the longitudinal direction moves the locking groove in which the locking projection is inclined, and the locking projection disengages from the locking groove and moves to the sliding groove. Since it is placed, it is possible to obtain an effect that the operation becomes extremely easy.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mechanical pencil of the present invention.

FIG. 2 is a plan view of FIG. 1 showing a mechanical pencil of the present invention.

FIG. 3 is an enlarged plan view of a main part showing another embodiment of the present invention.

FIG. 4 is an enlarged plan view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 2 Axis cylinder 2A Sliding groove of Axis cylinder 2 2B Locking groove of Axis cylinder 2 4 Chuck 5 Core tank 8 Weight 9 Core 10 Sliding member 10A Sliding member 10 locking projection 11 Return spring 102 Axis cylinder 102A Axis Sliding groove of the cylinder 102B Locking groove of the shaft cylinder 102E Slant surface of the shaft cylinder 102A Locking protrusion 110A of the sliding member 110E Slant surface of the sliding member

Claims (1)

[Claims for utility model registration] [Claim 1] In a mechanical pencil for advancing the chuck by an inertial force of a weight body generated by shaking the shaft cylinder to extend the core, a sliding groove extending in the longitudinal direction is formed on the shaft cylinder. A locking groove that is formed and inclined rearward in the circumferential direction from the front end of the sliding groove is formed, and the locking projection formed on the sliding member is movable in the sliding groove and locked in the locking groove. If possible, the sliding member is biased rearward by the return spring, and in a writing state in which the locking projection is located in the sliding groove, the sliding member is appropriately separated from the core tank, and the locking projection slides. A mechanical pencil characterized in that a sliding member presses a lead tank to open the chuck in a portable state locked in a moving groove.