Pen refill

Abstract

A refill comprises a pen tube and a pen point, ink is contained in the pen tube, backflow prevention ink is arranged at the end, away from the pen point, of the ink, a tail plug is further arranged at the tail end of the pen tube, a gas channel communicated with the interior of the pen tube and the outside is formed in the tail plug, a containing cavity is further formed in the tail plug and located on the gas channel, and a sealing piece moving up and down is arranged in the containing cavity. When the sealing piece moves up and down relative to the containing cavity, the gas channel is switched between the open state and the closed state, so that the interior of the pen tube is communicated with the outside when the pen point faces downwards, and the interior of the pen tube is isolated from the outside when the pen point faces upwards. The pen refill has the backflow prevention effect and the smooth writing effect at the same time, and is more convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to writing instrument technical field, concretely relates to a refill. BACKGROUND

[0002] The refill is an important component of various writing instruments such as a signature pen, a ballpoint pen and a neutral pen. The refill generally comprises a pen tube and a pen head arranged at one end of the pen tube, and the pen tube is filled with ink. In order to prevent the ink in the pen tube from flowing backward, an anti-backflow oil is usually arranged at the end of the ink far from the pen head. The anti-backflow oil has good fluidity and gradually moves toward the direction of the pen head with the use of the ink, and has slightly stronger adhesion than the ink, so that the anti-backflow oil can solve the problem of ink flowing backward when the refill is inverted in general cases. However, when the temperature changes, the adhesion and fluidity of the anti-backflow oil will change accordingly. When the environmental temperature rises, the adhesion of the anti-backflow oil weakens and the fluidity strengthens, and the ink will flow out of the refill under the action of gravity when the refill is inverted.

[0003] In view of the problem that the anti-backflow oil cannot solve the problem of ink flowing backward, a semi-automatic pen with anti-backflow and anti-pollution is disclosed in the Chinese Utility Model Patent with the authorization announcement No. CN204749597U, and the structure is shown in Figure 1 The semi-automatic pen relates to a refill for preventing ink from flowing backward, and the refill comprises a pen head 1a and a pen tube 2a, and the tail end of the pen tube 2a is provided with a sealing plug 3a. A center position of the sealing plug 3a is provided with a gas supplement channel 4a, and a plurality of protrusions are arranged in the gas supplement channel 4a. The protrusions can block the gas supplement channel 4a in normal state, and when the ink cannot be discharged smoothly, air is supplemented into the gas supplement channel 4a by means of a gas supplement device 5a.

[0004] However, the existing refill still has the following technical problems: the sealing plug 3a is arranged, which can seal the ink and the anti-backflow oil well to achieve good anti-backflow effect, but the air pressure at the tail end of the pen tube 2a is reduced, so that the air pressures at both ends of the ink are inconsistent, thereby causing the pen head 1a to discharge ink not smoothly and affecting the writing effect. Therefore, the gas supplement device 5a needs to be used regularly to supplement gas into the gas supplement channel 4a, and the use is also very inconvenient. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a refill which can simultaneously consider the anti-backflow effect and the smooth writing effect, and is more convenient to use.

[0006] The technical solution of the utility model is: a refill, including pen tube and pen head, the pen tube is equipped with ink, the ink is equipped with anti backflow oil far from the pen head, the tail end of pen tube is equipped with tail plug, the tail plug is equipped with gas passage which is connected with the inside of pen tube and the outside, the tail plug is equipped with containing cavity which is located on the gas passage, the containing cavity is equipped with seal which moves up and down, the seal is isolated from the anti backflow oil through the containing cavity, the gas passage is switched between opening state and closing state when the seal moves up and down relative to the containing cavity, so that the inside of pen tube is connected with the outside when the pen head is downward, and the inside of pen tube is isolated from the outside when the pen head is upward.

[0007] The working principle of the utility model refill is as follows:

[0008] The pen head is downward when the refill writes normally, the seal moves to the bottom of containing cavity, the gas passage is opened, the inside of pen tube is connected with the outside, the air pressure of both ends of ink is consistent, so that the ink can be smoothly discharged, and the writing effect is smooth; the pen head is upward when the refill is inverted, the seal moves to the top of containing cavity, the gas passage is closed, the inside of pen tube is isolated from the outside, the ink and anti backflow oil are sealed in the inside of pen tube and cannot flow outwards, and the anti backflow effect is good; the top of containing cavity and the bottom of containing cavity are based on the direction when writing normally.

[0009] After the above structure is adopted, the utility model has the following advantages:

[0010] The utility model discloses refill through forming gas passage in tail plug, and setting up and down movable sealing element on gas passage, realize the opening and closing of gas passage, thereby make tail plug can switch to sealing state and can switch to open state, when normal writing, gas passage opens, tail plug switches to open state, pen tube interior communicates with outside, ink both end pressure is consistent, ink smoothly, and writing effect is smooth, when the refill is inverted, gas passage closes, tail plug switches to sealing state, pen tube interior is isolated with outside, and ink and anti -backflow oil are sealed in tail plug and will not flow outward, and anti -backflow effect is good, just because tail plug can switch between sealing state and open state as needed, so simultaneously give consideration to anti -backflow effect and writing smooth effect, in addition, the setting of accommodating cavity makes sealing element and anti -backflow oil separate, even if the refill is inverted, due to the viscosity of anti -backflow oil, it is not easy to enter the accommodating cavity, thereby guaranteeing the separation state of sealing element and anti -backflow oil, and the separation state of sealing element and anti -backflow oil can prevent sealing element from moving and taking away anti -backflow oil and make anti -backflow oil flow from the gas passage of tail plug, and can prevent the influence of sealing element on the viscosity of anti -backflow oil when moving, these make anti -backflow effect further improve, in addition, due to the ingenious combination of the movable characteristic of sealing element and the use state of refill, thereby make sealing element can automatically follow the use state of refill and switch the opening and closing of gas passage, need not additional operation, and use is more convenient.

[0011] As preferred, the bottom of the tail plug and the liquid surface of the anti-backflow oil have a gap. This setting makes the anti-backflow oil less likely to enter the accommodating cavity of the tail plug, thereby better isolating the sealing element and the anti-backflow oil, and better preventing backflow.

[0012] As preferred, the gas passage includes a first gas-permeable hole arranged at the top of the accommodating cavity, and a second gas-permeable hole arranged at the bottom of the accommodating cavity. When the pen head is downward, the sealing element moves to the bottom of the accommodating cavity and the second gas-permeable hole is always open. When the pen head is upward, the sealing element moves to the top of the accommodating cavity and seals the first gas-permeable hole. This gas passage structure is simple and easy to open and close with the up-and-down movement of the sealing element.

[0013] As preferred, the top of the accommodating cavity and the bottom of the accommodating cavity are respectively provided with a first positioning groove and a second positioning groove matching the shape of the sealing element. This setting enables the sealing element to reliably dock at the top of the accommodating cavity and the bottom of the accommodating cavity.

[0014] As preferred, the sealing element is spherical, and rolls up and down in the accommodating cavity. The rolling cooperation of the sealing element and the accommodating cavity not only makes the sealing element more flexible in moving up and down, but also has less friction and certain mute effect.

[0015] As preferred, the first positioning groove is in the shape of a circular truncated cone with the top narrow and the bottom wide, and the first air vent is arranged at the top of the first positioning groove. This arrangement makes the shape of the sealing member match the shape of the first positioning groove, so that the sealing member can reliably stop at the top of the accommodating cavity and reliably seal the first air vent at the top of the first positioning groove.

[0016] As preferred, the second positioning groove is in the shape of a circular truncated cone with the top wide and the bottom narrow, and the second air vent extends from one side of the second positioning groove to the other side of the second positioning groove and extends to the outside of the sealing member at both sides of the second air vent, so that the second air vent is partially overlapped with the sealing member. This arrangement makes the shape of the sealing member match the shape of the second positioning groove, so that the sealing member can reliably stop at the bottom of the accommodating cavity and keep the second air vent open by using the partially overlapped part of the second air vent, and the second air vent extending through both sides of the second positioning groove is also very convenient to process.

[0017] As preferred, the second air vent comprises a circular hole arranged at the bottom of the second positioning groove and square holes arranged at both sides of the circular hole and extending to the outside of the sealing member. This second air vent structure is simple and easy to process.

[0018] As preferred, the tail plug comprises an upper cover and a lower cover, and the upper cover is buckled to the lower cover and a space is formed between the upper cover and the lower cover to form the accommodating cavity. The buckled upper cover and lower cover are convenient to install the movable member.

[0019] As preferred, the lower cover is hollow inside and a partition plate is arranged in the middle of the lower cover, and a space above the partition plate of the lower cover and the upper cover together form the accommodating cavity. This arrangement makes the space below the partition plate hollow, further enlarges the distance between the anti-backflow oil and the accommodating cavity, and makes the anti-backflow oil less likely to enter the accommodating cavity. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of a prior art anti-backflow and anti-pollution semi-automatic pen;

[0021] Figure 2 It is a structural schematic view of a refill of the utility model;

[0022] Figure 3 It is a top view of the refill of the utility model;

[0023] Figure 4 It is Figure 3 It is a sectional view along A-A′;

[0024] Figure 5 It is Figure 4 It is a local enlarged schematic view of B;

[0025] Figure 6 It is the structure schematic view of upper sealing cover of the utility model;

[0026] Figure 7 It is the structure schematic view of lower sealing cover of the utility model;

[0027] Figure 8 It is another structure schematic view of lower sealing cover of the utility model;

[0028] Prior art figure: 1a - pen head, 2a - pen tube, 3a - sealing plug, 4a - air supplement channel, 5a - air supplement device;

[0029] The utility model figure: 1 - pen tube, 2 - pen head, 3 - ink, 4 - prevent backflow oil, 5 - tail plug, 6 - gas channel, 7 - housing cavity, 8 - sealing element, 9 - first air hole, 10 - second air hole, 11 - first positioning recess, 12 - second positioning recess, 13 - round hole, 14 - square hole, 15 - upper sealing cover, 16 - lower sealing cover, 17 - partition, 18 - annular limiting step, 19 - first annular protrusion, 20 - second annular protrusion, 21 - third annular protrusion, 22 - connecting piece, D - gap. DETAILED DESCRIPTION

[0030] The utility model will be further explained in connection with the drawings and in connection with embodiment.

[0031] Embodiment:

[0032] As Figures 2-8 shown, a refill includes a pen tube 1 and a pen head 2, the pen tube 1 is internally provided with ink 3, the ink 3 is provided with a prevent backflow oil 4 at the end away from the pen head 2, the tail end of the pen tube 1 is further provided with a tail plug 5, the tail plug 5 is internally provided with a gas channel 6 communicating the inside of the pen tube 1 with the outside, the tail plug 5 is internally further provided with a housing cavity 7 located on the gas channel 6, the housing cavity 7 is internally provided with a sealing element 8 moving up and down, the sealing element 8 is isolated from the prevent backflow oil 4 through the housing cavity 7, the sealing element 8 switches between the opening state and the closing state of the gas channel 6 when moving up and down relative to the housing cavity 7, so that the inside of the pen tube 1 is communicated with the outside when the pen head 2 is downward and the inside of the pen tube 1 is isolated from the outside when the pen head 2 is upward; in the embodiment, the pen head 2 is fixed on the opposite end of the tail plug 5 of the pen tube 1 through a connecting piece 22; in the embodiment, the directions of upper, lower, top and bottom are accurate. Figure 4

[0033] ​The tail plug 5 can be switched between the sealed state and the open state as needed, so that the anti-backflow effect and the smooth writing effect are both taken into account. In addition, the setting of the accommodating cavity 7 separates the sealing element 8 from the anti-backflow oil 4, so that even if the refill is inverted, the anti-backflow oil 4 is not easy to enter the accommodating cavity 7 due to its own viscosity, thereby ensuring the separation state of the sealing element 8 and the anti-backflow oil 4. The separation state of the sealing element 8 and the anti-backflow oil 4 can prevent the anti-backflow oil 4 from flowing out of the gas passage 6 of the tail plug 5 when the sealing element 8 moves, and can also prevent the viscosity of the anti-backflow oil 4 from being affected when the sealing element 8 moves, which further improves the anti-backflow effect. In addition, the activity characteristics of the sealing element 8 are ingeniously combined with the use state of the refill, so that the sealing element 8 can automatically switch the opening and closing of the gas passage 6 according to the use state of the refill without additional operation, which is more convenient to use.

[0034] The bottom of the tail plug 5 and the liquid surface of the anti-backflow oil 4 have a gap D. This setting makes it more difficult for the anti-backflow oil 4 to enter the accommodating cavity 7 of the tail plug 5, thereby better isolating the sealing element 8 from the anti-backflow oil 4 and improving the anti-backflow effect.

[0035] The gas passage 6 includes a first gas-permeable hole 9 arranged at the top of the accommodating cavity 7 and a second gas-permeable hole 10 arranged at the bottom of the accommodating cavity 7. When the pen tip 2 is downward, the sealing element 8 moves to the bottom of the accommodating cavity 7 and the second gas-permeable hole 10 is always open. When the pen tip 2 is upward, the sealing element 8 moves to the top of the accommodating cavity 7 and seals the first gas-permeable hole 9. This gas passage 6 structure is simple and easy to open and close with the up-and-down movement of the sealing element 8.

[0036] The top of the accommodating cavity 7 and the bottom of the accommodating cavity 7 are respectively provided with a first positioning groove 11 and a second positioning groove 12 matched with the shape of the sealing element 8. This setting allows the sealing element 8 to reliably dock at the top of the accommodating cavity 7 and the bottom of the accommodating cavity 7.

[0037] The sealing element 8 is spherical and rolls up and down in the accommodating cavity 7. The rolling cooperation between the sealing element 8 and the accommodating cavity 7 makes the sealing element 8 move up and down more flexible and has less friction, which has a certain silent effect.

[0038] The first positioning groove 11 is a circular truncated cone with a narrow top and a wide bottom, and the first air hole 9 is arranged at the top of the first positioning groove 11. In this embodiment, the first air hole 9 is circular. This arrangement makes the shape of the sealing member 8 consistent with the shape of the first positioning groove 11, thereby ensuring that the sealing member 8 can reliably dock at the top of the accommodating cavity 7 and reliably seal the first air hole 9 at the top of the first positioning groove 11.

[0039] The second positioning groove 12 is a circular truncated cone with a wide top and a narrow bottom, and the second air hole 10 extends from one side of the second positioning groove 12 to the other side of the second positioning groove 12, with both sides of the second air hole 10 extending to the outside of the sealing member 8, so that the second air hole 10 is partially offset from the sealing member 8. This arrangement makes the shape of the sealing member 8 consistent with the shape of the second positioning groove 12, thereby ensuring that the sealing member 8 can reliably dock at the bottom of the accommodating cavity 7 and use the partially offset portion of the second air hole 10 to maintain the open state of the second air hole 10, and the fact that the second air hole 10 extends radially through both sides of the second positioning groove 12 also makes it very convenient to process.

[0040] The second air hole 10 includes a circular hole 13 arranged at the bottom of the second positioning groove 12 and a square hole 14 connected to both sides of the circular hole 13, with the end of the square hole 14 extending radially to the outside of the sealing member 8. This second air hole 10 structure is simple and easy to process.

[0041] The tail plug 5 includes an upper cover 15 and a lower cover 16, the upper cover 15 is snap-connected to the lower cover 16 and the accommodating cavity 7 is formed between them; in this embodiment, the upper cover 15 covers the outside of the lower cover 16, a first annular protrusion 19 is arranged on the inner side wall of the upper cover 15 and a second annular protrusion 20 is arranged on the outer side wall of the lower cover 16, when the second annular protrusion 20 of the lower cover 16 is snapped into the first annular protrusion 19 of the lower cover 16, the upper cover 15 and the lower cover 16 are snap-connected. The upper cover 15 and the lower cover 16 are snap-connected, which facilitates the installation of the movable part.

[0042] The lower cover 16 is hollow inside and has a partition 17 arranged in the middle, and the space above the partition 17 of the lower cover 16 forms the accommodating cavity 7 together with the upper cover 15; in this embodiment, the first positioning groove 11 and the first air hole 9 are arranged at the top of the upper cover 15, and the second positioning groove 12 and the second air hole 10 are arranged on the partition 17. This arrangement makes the space below the partition 17 a hollow cavity, further increasing the distance between the anti-backflow oil 4 and the accommodating cavity 7, making it less likely for the anti-backflow oil 4 to enter the accommodating cavity 7.

[0043] An annular limiting step 18 is arranged on the outer sidewall of the lower cover 16, the bottom of the annular limiting step 18 abuts against the pen tube 1 and the top abuts against the upper cover 15; in this embodiment, the outer sidewall of the lower cover 16 is further provided with a third annular protrusion 21 which is in interference fit with the inner sidewall of the pen tube 1, so as to fix the lower cover 16 at the tail end of the pen tube 1, the third annular protrusion 21 is below the second annular protrusion 20, and two circles of the third annular protrusion 21 are arranged in intervals, and the annular limiting step 18 is between the second annular protrusion 20 and the third annular protrusion 21. The arrangement reliably connects the lower cover 16, the pen tube 1 and the upper cover 15 together by the annular limiting step 18.

[0044] The working principle of the refill in this embodiment is as follows:

[0045] When the refill is used normally, the pen point 2 faces downward, the sealing member 8 moves to the bottom of the accommodating cavity 7 and stops in the second positioning groove 12, at this time, the second air passage 10 is not completely blocked by the sealing member 8, and the second air passage 10 remains in an open state, the gas passage 6 is open, the interior of the pen tube 1 is communicated with the outside through the first air passage 9 and the second air passage 10, the gas pressure at both ends of the ink 3 is consistent, so that the ink can be smoothly discharged, and the writing effect is smooth; when the refill is inverted, the pen point 2 faces upward, the sealing member 8 moves to the top of the accommodating cavity 7 and stops in the first positioning groove 11, at this time, the sealing member 8 seals the first air passage 9, the gas passage 6 is closed, the interior of the pen tube 1 is isolated from the outside, the ink 3 and the anti-backflow oil 4 are sealed in the interior of the pen tube 1 and cannot flow outwards, and the anti-backflow effect is good; the top of the accommodating cavity 7 and the bottom of the accommodating cavity 7 are based on the direction when used normally.

Claims

1. A refill comprising a barrel (1) containing ink (3) and a tip (2), the end of the ink (3) remote from the tip (2) being provided with an anti-backflow oil (4), characterized in that: The tail end of the pen tube (1) is also provided with a tail plug (5), the tail plug (5) is provided with a gas passage (6) for communication between the inside of the pen tube (1) and the outside, and the tail plug (5) is also provided with a containing cavity (7) above the gas passage (6), the containing cavity (7) is provided with a sealing element (8) moving up and down, the sealing element (8) is isolated from the anti-backflow oil (4) through the containing cavity (7), and the gas passage (6) is switched between the open state and the closed state when the sealing element (8) moves up and down relative to the containing cavity (7), so that the inside of the pen tube (1) is communicated with the outside when the pen head (2) is downward, and the inside of the pen tube (1) is isolated from the outside when the pen head (2) is upward.

2. A refill according to claim 1, characterized in that: The bottom of the tail plug (5) and the liquid surface of the anti-backflow oil (4) have a gap (D).

3. A refill according to claim 1, characterized in that: The gas passage (6) includes a first gas permeable hole (9) arranged at the top of the containing cavity (7) and a second gas permeable hole (10) arranged at the bottom of the containing cavity (7), when the pen head (2) is downward, the sealing element (8) moves to the bottom of the containing cavity (7) and the second gas permeable hole (10) is always open, when the pen head (2) is upward, the sealing element (8) moves to the top of the containing cavity (7) and seals the first gas permeable hole (9).

4. A refill according to claim 3, characterized in that: The top of the containing cavity (7) and the bottom of the containing cavity (7) are respectively provided with a first positioning groove (11) and a second positioning groove (12) matched with the shape of the sealing element (8).

5. A refill according to claim 4, characterized in that: The sealing element (8) is spherical, and the sealing element (8) rolls up and down in the containing cavity (7).

6. A refill according to claim 5, characterized in that: The first positioning groove (11) is a circular truncated cone with narrow top and wide bottom, and the first gas permeable hole (9) is arranged at the top of the first positioning groove (11).

7. A refill according to claim 5, characterized in that: The second positioning groove (12) is a circular truncated cone with wide top and narrow bottom, and the second gas permeable hole (10) extends from one side of the second positioning groove (12) to the other side of the second positioning groove (12), and the two sides of the second gas permeable hole (10) extend to the outside of the sealing element (8), so that the second gas permeable hole (10) is partially staggered with the sealing element (8).

8. A refill according to claim 7, characterized in that: The second gas permeable hole (10) includes a circular hole (13) arranged at the bottom of the second positioning groove (12) and a square hole (14) communicated on both sides of the circular hole (13), and the end of the square hole (14) extends radially to the outside of the sealing element (8).

9. A refill according to claim 1, characterized in that: The tail plug (5) includes an upper cover (15) and a lower cover (16), the upper cover (15) is snap-connected to the lower cover (16), and the containing cavity (7) is formed between the upper cover (15) and the lower cover (16).

10. A refill according to claim 9, characterized in that: The lower cover (16) is hollow inside and provided with a partition (17) in the middle, and the space above the partition (17) of the lower cover (16) forms the containing cavity (7) together with the upper cover (15).

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