JP-7855054-B2 - Multi-core writing instrument

JP7855054B2JP 7855054 B2JP7855054 B2JP 7855054B2JP-7855054-B2

Inventors

住吉聡

Assignees

三菱鉛筆株式会社

Dates

Publication Date: 20260507
Application Date: 20241223

Claims (4)

It comprises a barrel, a first operating part provided to be movable in the front-rear direction relative to the barrel, a plurality of writing elements, and a rotating member provided to be rotatable around the central axis relative to the barrel while holding the plurality of writing elements. As the first operating part moves back and forth, the first operating part and the rotating member cooperate to rotate the rotating member, causing one of the plurality of writing characters to move forward according to the position of the first operating part in the front-rear direction. The first operating section is located in the front half of the shaft cylinder, A cam groove is formed on one of the first operating part and the rotating member, and a cam projection is formed on the other of the first operating part and the rotating member, and the cam groove and the cam projection cooperate to rotate the rotating member, and the cam groove is formed in a spiral shape around the central axis, A multi-core writing instrument characterized in that the cam groove is not formed around the entire circumference of the first operating part and the rotating member.
The device further comprises a second operating section, and by a knocking operation that presses the second operating section forward, the forward-moving writing element extends and retracts relative to the barrel. The multi-core writing instrument according to claim 1, characterized in that at least one of the plurality of writing elements contains heat-changeable ink, and all or part of the first operating section or the second operating section is an erasing section capable of erasing the writing of the writing element.
The eraser unit is characterized in that, in an abrasion test (ASTM D1044) specified in JIS K7204, under a load of 9.8 N and 1000 rpm, the Taber abrasion amount on the CS-17 abrasion wheel of the Taber abrasion tester is less than 25 mg and the durometer D hardness is 30 or higher, as described in claim 2.
The device further comprises a second operating section, and by a knocking operation that presses the second operating section forward, the forward-moving writing element extends and retracts relative to the barrel. The multi-core writing instrument according to claim 1, characterized in that the second operating section can be used as a touch pen or stylus pen.

Description

This invention relates to a multi-core writing instrument. A multi-core writing instrument equipped with multiple refills, allowing for the selective deployment and retraction of the desired refill, is known (Patent Documents 1 and 2). In the multi-core writing instrument described in Patent Document 1, multiple operating parts (sliding bodies) are arranged circumferentially on the side of the barrel. Each operating part is movable in the front-to-back direction. Multiple refills are arranged inside the barrel, and each refill is connected to a corresponding operating part. By advancing the operating part corresponding to the desired refill, that refill can be put into writing mode. Therefore, when switching the refill being written on during writing, the process involves first interrupting writing and changing the grip on the barrel, then confirming the position of the operating part corresponding to the desired refill, and then advancing the operating part. In the multi-core writing instrument described in Patent Document 2, a window hole is formed in the part that the fingertip contacts during writing, and the operating shaft, which is the operating part, protrudes radially from the window hole. In the multi-core writing instrument described in Patent Document 2, two refills can be selectively extended and retracted. To switch from a non-writing state to a writing state, first, the operating shaft is rotated in the direction corresponding to the desired refill (let's call it the "first direction"), then the operating shaft is advanced, and then the operating shaft is rotated in the first direction to engage with the locking part, thereby entering the writing state. Furthermore, to switch the refill being written to during writing, first, the operating shaft is rotated in the opposite direction to the first direction (let's call it the "second direction"), then the operating shaft is retracted, then it is rotated further in the second direction, then the operating shaft is advanced, and then the operating shaft is rotated in the second direction to engage with the locking part, thereby entering the writing state. Japanese Patent Publication No. 2013-049192Japanese Patent Publication No. 2001-219690 Figure 1 is a perspective view of a multi-core writing instrument according to an embodiment of the present invention.Figure 2 is a longitudinal cross-sectional view of a multi-core writing instrument in a non-writing state.Figure 3 is a longitudinal cross-sectional view of a multi-core writing instrument in the writing state.Figure 4 is a vertical cross-sectional view of a multi-core writing instrument during refill switching while writing.Figure 5 is a vertical cross-sectional view of a multi-core writing instrument after switching refills while in the writing state.Figure 6 is a longitudinal cross-sectional view of the rear axis.Figure 7 is a perspective view of the operating member.Figure 8 is a side view of the operating member.Figure 9 is a perspective view of the rotating member.Figure 10 is a longitudinal cross-sectional view of the rotating member.Figure 11 is a perspective view of the slide cam.Figure 12 is a longitudinal cross-sectional view of the slide cam. The embodiments of the present invention will be described in detail below with reference to the drawings. Throughout the drawings, corresponding components are denoted by the same reference numerals. Figure 1 is a perspective view of a multi-core writing instrument 1 according to an embodiment of the present invention. Figure 2 is a longitudinal cross-sectional view of the multi-core writing instrument 1 in a non-writing state, Figure 3 is a longitudinal cross-sectional view of the multi-core writing instrument 1 in a writing state, Figure 4 is a longitudinal cross-sectional view of the multi-core writing instrument 1 during refill switching in the writing state, and Figure 5 is a longitudinal cross-sectional view of the multi-core writing instrument 1 in a writing state after refill switching. The multi-core writing instrument 1 has a barrel 2, which is a cylindrical member formed in a cylindrical shape. The barrel 2 consists of a front barrel 3, a middle barrel 4, and a rear barrel 10. Inside the barrel 2, there are multiple refills 5, specifically two refills 5, which are writing bodies each having a writing section 5a at one end. The two refills 5 are referred to as refill 5A and refill 5B when distinguishing them from each other. Each of the two refills 5 is independently biased backward by a corresponding spring 6, which acts as an elastic member. The multi-core writing instrument 1 further includes an operating member 20, which is a first operating section, a rotating member 30, a slide cam 40, a knocking member 50, which is a second operating section, a rotor 60, and a sliding wheel 70. In this specification, in the axial direction of the multi-core writing instrument 1, the side with the writing section 5a is defined as the "front" sid