JPH04104492U - Shape pencil cushion mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] This invention relates to a cushion mechanism that adjusts the cushion allowance when writing with a mechanical pencil. [Structure] The sleeve that presses the chuck tightening ring of the mechanical pencil is provided with a cushion spring that applies a pressing force in the direction of the tip. It is configured to be able to slide freely in any direction, rotate and engage integrally, and engage with the other outer cylinder using an inclined cam, and by relatively rotating between the front outer cylinder and the rear outer cylinder, the sleeve The cushion against the core is adjusted by changing the range in which the core can slide in the axial direction using a cushion spring. [Effect] The cushioning amount given to the lead during writing can be changed at will according to the user's preferences such as usage conditions, making it easy to use and preventing breakage of the lead.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a mechanical pencil that allows you to arbitrarily adjust the cushioning amount when writing. This relates to the sill cushion mechanism.

0002

[Conventional technology]

A pad with a cushion function that causes the lead to retreat inward when the lead receives excessive writing pressure. Various types of mechanical pencils have been proposed in the past, but depending on the writing conditions, A cushion that allows you to adjust the position of the lead from a fixed state to correspond to the writing pressure. There has never been anything equipped with this mechanism.

0003

[Problem that the idea aims to solve]

Conventional regular mechanical pencils have a writing shape with a knock and a lead protruding from the tip. In this case, the position of the lead is fixed and there is no cushioning mechanism even if it receives excessive writing pressure. The core was easy to break. For drafting, etc., press the lead a little longer to draw long lines all at once. It was easy to break, especially when I took it out. In addition, in the case of the above-mentioned mechanical pencil with a cushion function, the cushion against the lead Since the size of the text cannot be adjusted, writing pressure may be intense when writing words. When the temperature fluctuated, the core moved in and out at random, which was inconvenient. .

0004 This idea was made to solve the problem mentioned above, and it is possible to avoid excessive writing pressure. When applying to the lead, check the writing conditions at that time, the hardness of the lead, and the hardness of the lead to prevent the lead from breaking. You can adjust the cushion length (cushion stroke) to best suit the properties, paper quality, etc. It also has a mechanism that locks the core in and out when no cushion is required. The purpose is to obtain.

[0005]

[Means to solve the problem] The cushion mechanism of the mechanical pencil according to claim 1 of this invention is of a knock type. The sleeve that presses the chuck tightening ring of the mechanical pencil is the front sleeve and the rear sleeve. The rear sleeve is divided into two parts, the cushioning elastic body is attached between them, and the rear sleeve is divided into two parts. is slidable in the axial direction and rotates integrally with either the front outer cylinder or the rear outer cylinder. A beveled cam is provided on either side between the rear sleeve and the other outer cylinder, The other side is provided with a protrusion that engages with this inclined cam.

[0006] The cushion mechanism of the mechanical pencil according to claim 2 of this invention is of a knock type. The sleeve that presses the mechanical pencil chuck tightening ring and the front outer cylinder or rear A cushion spring is attached between one of the outer cylinders, and the sleeve is attached to this It is slidable in the axial direction and rotates integrally with one outer cylinder, and is connected between the sleeve and the other outer cylinder. Then, a slope cam is installed on one side, and a protrusion that engages with this slope cam is installed on the other side. It is something that

[0007]

[Effect]

The structure according to claim 1 of this invention is that the sleeve is divided into two parts and a cushion is placed between them. The sleeve is slidably slidable in the axial direction and rotated integrally with one of the outer cylinders. , because it was engaged with the other outer cylinder via the inclined cam, the two outer cylinders were relatively By rotating, the distance between the cushion springs can be expanded or contracted at will. The pressing force of the cushion spring against the jack tightening ring increases and decreases continuously, and the cushion spring tightens. The size of the spring can be adjusted arbitrarily from zero when the spring is in close contact to the maximum value when the spring is fully extended. Can be adjusted.

[0008] The structure according to claim 2 of this invention is such that the sleeve can be freely slid in the axial direction on one of the outer cylinders. Since it rotates integrally and engages with the other outer cylinder via an inclined cam, The position of the sleeve is always fixed under the pressure of the cushion spring. By relatively rotating both outer cylinders, the distance between the slope cam and the protrusion can be reduced to zero. The sleeve changes axially from the writing pressure to the maximum value. The range of motion can also be changed to provide arbitrary cushioning to the core.

[0009]

【Example】

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In Figure 1 , 1 is the front outer cylinder, 2 is the rear outer cylinder, and the outer cylinders 1 and 2 are the fitting part 3, which rotate relative to each other. freely connected. A tip 4 is fixed to the tip of the front outer cylinder 1 via an engaging part 5. It is worn. 6 is a lead delivery mechanism, on which the lead chuck 7 is attached so as to be slidable in the axial direction. It is. At the tip of this lead chuck 7, there is a tip at the tip of this lead chuck 7. A chuck tightening ring 8 tightens the lead chuck 7 so as to tighten the chuck portion 7a. The tip 10 of the inner tube (core pipe) 9 integrally engaged with the rear end 7b and the step of the tip 4 The tip of the front sleeve 11a, which will be described later, contacts the portion 14 and the chuck tightening ring 8. It is pressed by the lead chuck pressing spring 13 that is landed between the spring receiving part 12a. It is attached so that the core 41 may be fixed.

0010 It is inserted concentrically between the front outer cylinder 1 and the inner cylinder 9 so as to be able to slide in the axial direction, and the tip 10 is A front sleeve 11 having the spring receiving portion 12a in contact with the chuck tightening ring 8; a, so as to be able to freely slide in the axial direction and rotate together through the front outer cylinder 1 and the engaging part 15. A cushion spring (cushion elastic body) 1 is placed between the meshed rear sleeve 11b and the meshed rear sleeve 11b. 6, the spring receiver 17 at the rear end of the front sleeve 11a and the front end of the rear sleeve 11b. The ball is landed in contact with the spring receiving portion 18.

[0011] At the rear end of this rear sleeve 11b, there is a half-shape integrally provided on the inner circumference of the rear outer cylinder 2. A pair of slope cams 19a, 19b slide in contact with slopes 20a, 20b for each circumference. A pair of protrusions 21a and 21b are provided. FIG. 2 shows slope cams 19a, 19. FIG. 3 is a developed view showing the state in which the protrusions 21a and 21b are engaged with the rear outer cylinder 2. Side view (a), top view (b), and perspective view of the slope cam 19 that is integrally fitted to the peripheral part (c). FIG. 4 is a perspective view showing the protrusions 21a and 21b integrally provided on the front sleeve 11a. It is a diagram. The slope cams 19a and 19b are located inside the rear outer cylinder 2, as shown in FIGS. 3(a) and 3(b). A fitting ring 2 having a groove 22 that fits into a protrusion (not shown) on the periphery to fix rotation. The cylindrical portion 24 is integrated with the cylindrical portion 3.

0012 The relative rotation range between the slope cams 19a, 19b and the protrusions 21a, 21b is half a circle. Therefore, the rear outer cylinder 2 and the protrusions 21a, 2 are integrally provided with the slope cams 19a, 19b. 1b is integrally provided with the front sleeve 11a via the engaging portion 15. mutually to limit the relative rotation range with the outer cylinder 1 to half a circumference, that is, 180°. Arc-shaped detent protrusions 25 and 26 that rotate and lock are located at the rear of the front outer cylinder 1, respectively. The protrusion 27 fits integrally with the end (FIGS. 5(a) and 5(b)) and the inner circumference of the rear outer cylinder 2. It is provided in the fitting ring 28 (FIGS. 6(a) and 6(b)). Arc-shaped anti-rotation protrusion The central angle of the protrusion 25 is 75° (Fig. 5(b)), and the central angle of the protrusion 26 is 105° (Fig. 5(b)). In Fig. 6(b)), the total is 180°, so the rotation prevention protrusions 25 and 26 are The relative rotation range is 180 degrees, that is, half a circle.

[0013] On the other hand, the inner cylinder 9 fitted to the rear end of the lead chuck 7 has a lid having a helical shaft 29. A core cap consisting of a portion 30 and a cylindrical portion 32 that is integrally fitted with this through a meshing portion 31. The cap 33 is removable and rotates integrally by fitting through a hook (not shown). There is. This core cap 33 is rotatably engaged with the rear outer cylinder 2 via the engagement part 34. A cylindrical knock part 36 is rotatably fitted into the annular protrusion 35 of the helical shaft 29, On the inner periphery of the hook part 36, a holding part 38 for fixing the eraser 37 is provided so as to be slidable in the axial direction. a sliding cylinder 40 having a protrusion 39 at the rear end that engages with the screw 29a of the helical shaft 29; is inserted.

[0014] Therefore, when the knocking part 36 is operated to knock, the inner cylinder 9 connected to the knocking part 36 is It is transmitted to the lead chuck 7 via the lead chuck 7 to enable the lead 41 to be taken in and taken out. Also, the rear By relatively rotating between the outer cylinder 2 and the knock part 36, the sliding cylinder 40 is rotated. The eraser 37 is rotated relative to the helical shaft 29, and as a result, it slides in the axial direction. Allows for loading and unloading.

[0015] Next, the operation will be explained. Since the first embodiment of claim 1 of this invention is constructed as described above, the front outer cylinder 1 and the rear outer cylinder 2, the front outer cylinder 1 and the rear outer cylinder 1 are rotated through the meshing part 15. A pair of protrusions 21a and 21b are integrally provided on the rear sleeve 11b that rotates together. , and a pair of slope cams 19a and 19b integrally provided on the rear outer cylinder 2, respectively. While sliding, it rotates relatively between half circles. In this way, it rotates to one side and protrudes. 21a, 21b are directed toward the higher sides of the inclined surfaces 20a, 20b of the inclined cams 19a, 19b. When the rear sleeve 11b is subjected to sliding movement, it is moved to the left in the figure and the cushion is moved. Since the compression spring 16 is compressed, the chuck tightening ring 8 is compressed by the front sleeve 11a. The pressing force against the core 41 increases through this chuck tightening ring 8. This will give you writing pressure. Then, as the rotation continues, the cushion spring 16 When compressed to the limit where they are almost in close contact with each other, the axial direction of the front sleeve 11a Since the movement is fixed, there is no cushioning effect on the core 41, and the core 41 is fixed. It will be done.

[0016] Next, the protrusions 21a, 21b are rotated to the other side, and the protrusions 21a, 21b are on the lower side of the inclined surfaces 20a, 20b. When subjected to sliding motion in the opposite direction, the rear sleeve 11b is moved to the right and the cushion Since the spring 16 is relaxed, the pressing force against the chuck tightening ring 8 is reduced and the core 41 is This will reduce the writing pressure. Then, continue rotating and release the cushion spring. When the core 41 is in its most relaxed state, the maximum cushioning effect is given to the core 41.

[0017] FIG. 7 shows a second embodiment of this invention, which also relates to claim 1. The same reference numerals are given to parts that overlap with those in the embodiment, and some parts will be omitted from the description. front As in the first embodiment, the sleeve 11a has its tip 12 aligned with the stepped portion 14 of the tip 4. The chuck tightening ring 8 receives the pressing force of a cushion spring 16 (described later) from its rear end. It is touching. The cushion spring 16 is connected to the spring receiving part 17 of the front sleeve 11a and the rear sleeve 1. 1b and the spring receiving part 18, and the inclined cams 19a and 19b are in the case of the first embodiment. Similarly, the inclined cams 19a, 19 are fitted integrally with the inner peripheral part of the front outer cylinder 1. The protrusions 21a and 21b that are engaged with and slide on the rear outer cylinder 2 through the meshing part 15 are Spring receiving part 1 at the tip of the rear sleeve 11b which is slidable in the axial direction and is integrally engaged with rotation. 8 on the outer peripheral surface. Figure 8 shows a side view of the sleeve 11b. Figure (a) and top view (b) are shown. Also, although not shown, the front outer cylinder 1 and the rear outer cylinder 2 is provided with a detent protrusion for restricting rotation as described in Embodiment 1. There is a starting point.

[0018] Next, the operation will be explained. In the second embodiment of claim 1 of this invention, since the structure is as described above, the front outer cylinder 1 When relatively rotating the rear outer cylinder 2 and the rear cylinder 2, the rear cylinder 2 and A pair of protrusions 21a and 21b integrally provided on the rear sleeve 11b that rotates around the body, A pair of slope cams 19a and 19b integrally provided on the front outer cylinder 1 are used for sliding. While moving, it rotates relatively between half circles. As a result, the rear sleeve 11b is axially The core 41 is slid in the opposite direction to provide the core 41 with the same cushioning effect as in the first embodiment. I can do it.

[0019] Hereinafter, the third embodiment regarding claim 2 of this invention will be described as the first and second embodiments with reference to the drawings. Overlapping parts will be described with the same reference numerals and some parts will be omitted. In claim 2 In FIG. 9, the sleeve 11 is constructed by itself, and the cushion spring 16 is attached to this sleeve. It is provided between the tube 11 and the rear outer cylinder 2. That is, the cushion spring 16 is The bullet lands between the spring receiver 17 at the rear of the barrel 11 and the spring receiver 18 at the front of the rear outer cylinder 2. It will be done. Then, the sleeve 11 receives the pressing force of this cushion spring 16, and the tip of the sleeve 11 is When the part 12 contacts the stepped part 14 of the tip 4 and the chuck tightening ring 8 and writes on the lead 41, It acts to provide a cushion. A pair of inclined cams 19a and 19b are connected to the inner circumference of the rear outer cylinder 2 via a fitting ring 23. The rear outer cylinder 2 rotates together with the rear outer cylinder 2. Then, through the meshing part 15 At the rear end of the sleeve 11, which is slidable in the axial direction and integrally engaged with the front outer cylinder 1, A pair of protrusions 21a and 21b are provided. FIG. 10 shows a cross-sectional view of the sleeve 11 ( Figure a) and outline drawing (b) are shown. 15a is inserted into a groove (not shown) in the front outer cylinder 1 in the axial direction. These are protrusions that are slidable and rotate as one unit.

[0020] Next, the operation will be explained. In the third embodiment related to claim 2 of this invention, since the structure is as described above, the front part When rotating the outer cylinder 1 and the rear outer cylinder 2 relatively, the front outer cylinder A pair of protrusions 21a and 21b integrally provided on the sleeve 11 that rotates together with the sleeve 1, It spans half a circumference between a pair of inclined cams 19a and 19b integrally provided on the rear outer cylinder 2. rotate relative to each other. At this time, the sleeve 11 receives the pressing force of the cushion spring 16. The sleeve 11 is in contact with the tip 4 and its sliding in the axial direction is fixed. The pair of protrusions 21a and 21b of the body are also fixed in their axial positions. Therefore, the protrusion 21a , 21b and the inclined cams 19a, 19b change with relative rotation of the two. I will do it. Therefore, when rotating in one direction and this distance decreases, The cushioning range of the core 41 that is pushed in by the writing pressure becomes narrower and reaches its limit. When the protrusions 21a, 21b and the inclined cams 19a, 19b are almost in contact with each other, the cushion is tion effect disappears. Also, when rotating in the other direction to increase this distance, the cushion The range becomes wider, and at its extreme, the spacing is widest and the maximum cushioning occurs. give.

[0021] FIG. 11 shows a fourth embodiment of this invention, which also relates to claim 2. Parts that overlap with those in the embodiment are given the same reference numerals and will be described with some parts omitted. No. Similar to the third embodiment, a cushion spring 16 is elastically connected between the sleeve 11 and the rear outer cylinder 2. This gives the core 41 a cushioning effect when writing. A pair of inclined cams 19a and 19b are integrally provided on the inner circumference of the front outer cylinder 1, and are engaged with each other. A sleeve 11 is slidable in the axial direction and integrally engaged with the rear outer cylinder 2 via the portion 15. A pair of protrusions 21a, 21b are provided on the outer periphery of the slanted cams 19a, 21b to face the inclined cams 19a, 19b. It is being

[0022] Next, the operation will be explained. The fourth embodiment related to claim 2 of this invention is constructed as described above, so that the front When rotating the outer cylinder 1 and the rear outer cylinder 2 relatively, the sleeve Since the sleeve 11 rotates together, the protrusions 21a and 21b that are integral with the sleeve 11 are It rotates relative to the inclined cams 19a and 19b integrally provided on the cylinder 1, and in the case of the third embodiment. As with the case, the distance between the protrusions 21a, 21b and the slopes 19a, 19b decreases with rotation. changes from the zero contact state to the maximum open state, and the range of action of the cushion changes. Adjust.

[0023] In all of the above embodiments, the slope cam is placed on the outer cylinder side, and the slope cam is engaged with the slope cam. Although the structure has a stopping protrusion on the sleeve side, conversely, an inclined cam is installed on the sleeve side. , and even if a protrusion is provided on the outer cylinder side that engages with this inclined cam, the same cushioning effect can be obtained. This invention is included in this invention. In addition, the installation positions of the slope cam, protrusion, and cushion spring are as follows: Although four examples have been shown, this invention is not limited by these examples. Not. In addition, in embodiments other than the first embodiment, the structure of the anti-rotation protrusion will be explained. Although omitted, a rotation stopper is provided in each embodiment. And that The position may be anywhere during relative rotation, for example, the front position as in the first embodiment. Between the external cylinder and the rear external cylinder, or between the sleeve and the front part that is not engaged with this sleeve. It is provided between either the outer cylinder or the rear outer cylinder.

[0024]

[Effect of the idea]

As described above, according to claim 1 of this invention, the Divide the sleeve to be pressed into two into a front sleeve and a rear sleeve, and insert this sleeve between them. The cushion spring that presses the leaf toward the tip is attached to the front outer cylinder and rear outer cylinder. The rear sleeve is axially slidable and rotationally engaged with one of the outer cylinders, and the other It is equipped with an inclined cam that locks between the outer cylinder and the front outer cylinder and the rear outer cylinder. The protrusion slides on the inclined surface of the inclined cam and moves in the axial direction. The sleeve expands and contracts the cushion spring and applies it to the core through the sleeve. Adjust the pressing force. Therefore, the size of the cushion given to the core is determined by the cushion spring. from zero, which is compressed and tightly adhered, to maximum, which is the most relaxed, depending on the writing conditions. Can be adjusted. Also, according to claim 2 of this invention, there is provided a spring that contacts and presses the chuck tightening ring. A sleeve is provided by attaching a cushion spring to the sleeve between the outer cylinder and the relatively rotating outer cylinder. The outer cylinder is slidable in the axial direction and rotates integrally with either the front outer cylinder or the rear outer cylinder. A sloped cam that engages with the other outer cylinder and locks it is provided, so the front outer cylinder and rear By rotating the outer cylinder relatively, the distance between the slope cam and the protrusion can be adjusted to It can be changed continuously from zero, where the bar and protrusion are almost in contact, to the maximum open state. The size of the cushion relative to the core can be adjusted from zero, which is in contact, to the maximum value, which is the most open. It can be adjusted to As mentioned above, in either case, the The effect is that you can adjust the size of the cushion to give it to the core. be. Especially when drawing plans, etc., do not extend the lead long or hold the lead diagonally to the surface of the paper. The lead was prone to break if you applied too much writing pressure, but with this idea, By providing a cushion to the lead, the lead will not be pushed in even when subjected to excessive writing pressure. This reduces the protrusion length and absorbs shock, preventing breakage of the core. There is an effect. In cases such as writing down words, if you provide a cushion, the lead will come out. If you find it difficult to insert the cushion, reduce the size of the cushion to match the user's writing pressure. You can also set it to zero if necessary.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of this invention.

FIG. 2 is a developed view of the inclined cam of FIG. 1;

3 shows the inclined cam of FIG. 1; FIG. 3a is a side view, FIG. 3b is a top view, and FIG. 3c is a perspective view;

FIG. 4 is a perspective view of the sleeve of FIG. 1;

5 is a sectional view of the front outer cylinder of FIG. 1, and FIG. 5b is a side view thereof.

[Fig. 6] The anti-rotation protrusion in Fig. 1, Fig. 6a is a side view, Fig. 6
b is a top view.

FIG. 7 is a sectional view showing a second embodiment of the invention.

8 shows the sleeve of FIG. 7, with FIG. 7a being a side view and FIG. 7b being a top view;

FIG. 9 is a sectional view showing a third embodiment of the invention.

FIG. 10 shows the sleeve of FIG. 9, FIG. 9a is a cross-sectional view, and FIG. 9b is a cross-sectional view.
is a side view.

FIG. 11 is a sectional view showing a fourth embodiment of the invention.

[Explanation of symbols]

1 Front outer cylinder 2 Rear outer cylinder 6 Lead delivery mechanism 8 Chuck tightening ring 11, 11a, 11b Sleeve 15 Engagement part 16 Cushion spring 19a, 19b Slope cam 20
a, 20b Inclined surface 21a, 21b Protrusion

Claims (2)

[Scope of utility model registration request] Claim 1: A front sleeve (1) that presses a chuck tightening ring (8) that tightens a lead chuck (7) of a lead feeding mechanism (6) of a knock-type mechanical pencil toward the tip.
1a), a rear sleeve (11b) disposed at the rear of the front sleeve (11a), and a rear sleeve (11b) arranged at the rear of the front sleeve (11a);
1a) and the rear sleeve (11b), and the rear sleeve (11) is attached to either the front outer cylinder (1) or the rear outer cylinder (2).
b) which is slidable in the axial direction and integrally rotates.
5), and an inclined cam (20a, 20b) having an inclined surface (20a, 20b) in the circumferential direction between the rear sleeve (11b) and the other outer cylinder (1) or (2). 19a, 19b) and the inclined cam (19a, 19b) on the other hand.
A cushion mechanism for a mechanical pencil, characterized in that a cushion mechanism for a mechanical pencil is provided with projections (21a, 21b) that lock onto the inclined surfaces (20a, 20b) of the mechanical pencil. [Claim 2] A sleeve (11) that presses toward the tip a chuck tightening ring (8) that tightens a lead chuck (7) of a lead delivery mechanism (6) of a knock-type mechanical pencil.
and a cushioning elastic body ( 16); and a meshing part (15) that connects the sleeve (11) to the one outer cylinder (1) or (2) in an axially slidable and rotatable manner;
Between the sleeve (11) and the other outer cylinder (2) or (1), there is a circumferentially inclined surface (20a, 2
0b) and the inclined surfaces (20a, 20a, 20b) of the inclined cams (19a, 19b) on the other hand.
1. A cushion mechanism for a mechanical pencil, characterized in that a cushion mechanism for a mechanical pencil is provided with projections (21a, 21b) that are engaged with the cushion mechanism (21a, 21b).