Piston type water pumping pen

Abstract

The utility model discloses a piston type water pumping pen, which relates to the field of writing tools, and comprises a pen holder, a pen holder and a pen point, the outer side of the pen holder is sleeved with a pen cap, the pen further comprises an ink suction device unit, and the ink suction device unit comprises an ink suction unit and a bearing unit which are arranged on the inner side of the pen holder; the bearing unit comprises an ink bag fixedly installed at the top end of the pen holder and a driving shell coaxially arranged above the ink bag. The ink absorbing unit comprises a driving block, an axial moving unit, a limiting unit and a piston ring; the axial moving unit comprises a first threaded rod, a second threaded rod and a piston rod; the top end of the first threaded rod is clamped with the driving block; according to the piston type water pumping pen, linear motion of the piston is achieved through transmission of the double threaded rods and cooperation of the limiting unit, and friction loss is reduced; the modular design facilitates disassembly and maintenance; the axial sliding of the limiting sleeve and the threaded sleeve restrains the stability of the lifting motion.

Description

Technical Field

[0001] This utility model relates to writing instrument technology, specifically to a piston-type fountain pen. Background Technology

[0002] A fountain pen is a writing instrument widely loved for its unique writing experience and exquisite craftsmanship. It typically consists of a barrel, cap, nib, and ink system. The barrel is usually made of metal or plastic, providing not only a comfortable grip but also often serving as a fashionable accessory that reflects personal taste. The cap protects the nib, prevents the ink from drying out, and is also convenient to carry. The nib is made of alloy and precision-machined to smoothly control the ink flow, producing elegant and flowing lines of varying thickness. Ink systems come in various types, including cartridge-based, refill-type, and converter-type, allowing users to choose the method that best suits their needs.

[0003] Traditional piston-type fountain pens typically use a rotating pen barrel to drive the piston to draw ink. However, existing technologies have complex piston structures, resulting in problems such as low transmission efficiency, poor sealing, and difficulty in disassembly and maintenance. The piston rod and threaded transmission components are prone to wear due to frequent rotation, and the insufficient design of the limiting structure can easily cause piston displacement. Furthermore, the piston stroke occupies a large space, which in turn occupies ink storage space. Utility Model Content

[0004] The purpose of this invention is to provide a piston-type fountain pen to address the shortcomings of existing technologies, such as complex piston structures and small ink storage space.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a piston-type fountain pen, including a pen barrel, a pen grip, a pen tip and a rotating sleeve, a pen cap is sleeved on the outside of the pen grip, and an ink converter unit, which includes an ink-absorbing unit and a support unit disposed on the inside of the pen barrel.

[0006] The supporting unit includes an ink sac fixedly installed at the top of the pen grip and a drive housing coaxially disposed above the ink sac, the drive housing being fixedly installed inside the rotating sleeve;

[0007] The ink absorption unit includes a drive block, an axial movement unit, a limiting unit, and a piston ring;

[0008] The axial movement unit includes a first threaded rod, a second threaded rod, and a piston rod. The top end of the first threaded rod is engaged with the drive block. The outer side of the bottom end of the first threaded rod is threadedly connected to the inner thread of the second threaded rod. The outer side of the second threaded rod is threadedly connected to the inner side of the piston rod. The bottom end of the piston rod is fixedly connected to the top of the piston ring. A limit protrusion is fixedly installed on the top of the outer side of the piston rod.

[0009] The limiting unit includes a threaded sleeve and a limiting sleeve. The threaded sleeve is disposed on the top of the ink sac. Multiple axially extending inner limiting grooves are evenly formed on the inner side of the threaded sleeve along the circumference. The limiting sleeve is slidably connected to the inner wall of the threaded sleeve. Several limiting blocks are fixedly installed on the top of the outer side of the limiting sleeve. The limiting blocks are embedded in the inner limiting grooves and slide along their axial direction. An axial limiting groove matching the limiting protrusion is formed on the inner side of the limiting sleeve. The limiting protrusion is embedded in the inner side of the limiting groove and slides along it.

[0010] Furthermore, the drive block is fixedly installed on the top inner side of the drive housing, and the inner side of the drive block is provided with a snap-fit ​​groove. The top end of the first threaded rod is embedded in the snap-fit ​​groove to restrict the circumferential rotation of the first threaded rod.

[0011] Furthermore, the threaded sleeve has a lower thread on the outer side of its bottom end and an upper thread on the outer side of its top end. The threaded sleeve is fixedly connected to the inner side of the top end of the ink sac through the lower thread.

[0012] Furthermore, the threaded sleeve is connected to the inner thread at the bottom of the drive housing via an upper thread.

[0013] Furthermore, the piston ring has several grooves on its outer side, and a sealing ring is engaged with the piston ring through the grooves.

[0014] Furthermore, the limiting sleeve is coaxially sleeved on the outside of the piston rod, and the limiting protrusion and the limiting groove of the limiting sleeve form an axial sliding constraint.

[0015] Compared with the prior art, the piston-type fountain pen provided by this utility model has the following advantages:

[0016] 1. By cooperating with the double threaded rod drive and the limiting unit, linear piston movement is achieved, reducing frictional loss;

[0017] II. Modular design facilitates disassembly and maintenance;

[0018] 3. The axial sliding constraint of the limiting sleeve and the threaded sleeve improves motion stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0021] Figure 2 This is a partial structural cross-sectional view of an embodiment of the present utility model;

[0022] Figure 3 This is a first schematic cross-sectional view of a partial structure of the ink converter unit provided in an embodiment of the present utility model;

[0023] Figure 4 This is a partial structural diagram of the ink converter unit provided in an embodiment of the present utility model;

[0024] Figure 5 This is a partial structural separation diagram of the ink converter unit provided in an embodiment of the present utility model;

[0025] Figure 6 This is a cross-sectional schematic diagram of a threaded sleeve provided in an embodiment of the present utility model;

[0026] Figure 7 This is a second schematic cross-sectional view of a partial structure of the ink absorber unit provided in an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 11. Pen cap; 12. Pen barrel; 13. Pen grip; 14. Pen tip; 15. Rotating sleeve; 2. Ink converter unit; 21. Drive housing; 22. Ink sac; 23. Threaded sleeve; 231. Upper thread; 232. Lower thread; 233. Inner limiting groove; 24. Drive block; 25. Limiting sleeve; 251. Limiting block; 252. Limiting groove; 26. Piston rod; 261. Piston ring; 262. Sealing ring; 263. Limiting protrusion; 27. First threaded rod; 28. Second threaded rod. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1:

[0031] Please see Figures 1-7 A piston-type fountain pen includes a pen barrel 12, a pen grip 13, a pen tip 14 and a rotating sleeve 15. A pen cap 11 is fitted on the outside of the pen grip 13. The pen pen also includes an ink converter unit 2, which includes an ink-absorbing unit and a support unit disposed inside the pen barrel 12.

[0032] The support unit includes an ink sac 22 fixedly installed on the top of the pen grip 13 and a drive housing 21 coaxially disposed above the ink sac 22. The drive housing 21 is fixedly installed inside the rotating sleeve 15.

[0033] The ink absorption unit includes a drive block 24, an axial movement unit, a limiting unit, and a piston ring 261;

[0034] The axial movement unit includes a first threaded rod 27, a second threaded rod 28, and a piston rod 26. The top end of the first threaded rod 27 is engaged with the drive block 24. The outer side of the bottom end of the first threaded rod 27 is threadedly connected to the inner thread of the second threaded rod 28. The outer side of the second threaded rod 28 is threadedly connected to the inner side of the piston rod 26. The bottom end of the piston rod 26 is fixedly connected to the top of the piston ring 261. A limit protrusion 263 is fixedly installed on the top of the outer side of the piston rod 26.

[0035] The limiting unit includes a threaded sleeve 23 and a limiting sleeve 25. The threaded sleeve 23 is disposed on the top of the ink sac 22. Multiple axially extending inner limiting grooves 233 are evenly provided on the inner side of the threaded sleeve 23 along the circumferential direction. The limiting sleeve 25 is slidably connected to the inner wall of the threaded sleeve 23. Several limiting blocks 251 are fixedly installed on the top of the outer side of the limiting sleeve 25. The limiting blocks 251 are embedded in the inner limiting grooves 233 and slide along their axial direction. An axial limiting groove 252 matching the limiting protrusion 263 is provided on the inner side of the limiting sleeve 25. The limiting protrusion 263 is embedded in the inner side of the limiting groove 252 and slides along it.

[0036] The inner bottom of the pen barrel 12 is threadedly connected to the outer top of the pen grip 13. A rotating sleeve 15 is coaxially mounted on the top of the pen barrel 12. Rotating the rotating sleeve 15 causes the drive housing 21 to rotate accordingly. The pen tip 14 is detachably mounted on the bottom of the pen grip 13. A pen cap 11 is fitted on the outer side of the pen grip 13 to protect the pen tip 14. An ink converter unit 2 is installed inside the pen barrel 12, the core components of which are the carrier unit and the ink-absorbing unit. The carrier unit consists of an ink sac 22 and a drive housing 21. The ink sac 22 is fixedly connected to the pen grip 13 by a snap-fit ​​method. The ink sac 22 provides ink for writing to the pen tip 14. The drive housing 21 is coaxially mounted above the ink sac 22 and connected by a threaded sleeve 23.

[0037] The drive block 24 is fixedly installed on the top inner side of the drive housing 21. The drive block 24 has a snap-fit ​​groove on its inner side. The top of the first threaded rod 27 is embedded in the snap-fit ​​groove to restrict the circumferential rotation of the first threaded rod 27.

[0038] The threaded sleeve 23 has a lower thread 232 on the outer side of its bottom end and an upper thread 231 on the outer side of its top end. The threaded sleeve 23 is fixedly connected to the inner side of the top end of the ink sac 22 through the lower thread 232.

[0039] The top of the ink sac 22 is fixed by the lower thread 232 of the threaded sleeve 23. The outer side of the top of the threaded sleeve 23 has an upper thread 231, which is threaded to the inner side of the bottom of the drive housing 21, so as to realize the detachable installation of the drive housing 21. The top of the inner side of the drive housing 21 is fixed with a drive block 24. The drive block 24 has a snap-fit ​​groove to constrain the circumferential rotation of the first threaded rod 27. When the drive housing 21 rotates, it drives the drive block 24 to move, increasing the ink storage space in the ink sac 22.

[0040] The threaded sleeve 23 is connected to the inner thread at the bottom of the drive housing 21 via the upper thread 231.

[0041] The piston ring 261 has several grooves on its outer side, and the piston ring 261 is engaged with the sealing ring 262 through the grooves.

[0042] The ink-absorbing unit includes a piston rod 26, a first threaded rod 27, a second threaded rod 28, and a piston ring 261. The top end of the first threaded rod 27 is embedded in the locking groove of the drive block 24, and the bottom end is connected to the second threaded rod 28 through an internal thread. The outer side of the second threaded rod 28 is threaded with the inner side of the piston rod 26. The piston ring 261 is fixed at the bottom end of the piston rod 26, and a sealing ring 262 is embedded on the outer side of the piston ring 261. Its groove design ensures that the sealing ring 262 fits tightly against the inner wall of the ink sac 22.

[0043] The limiting sleeve 25 is coaxially sleeved on the outside of the piston rod 26, and the limiting protrusion 263 and the limiting groove 252 of the limiting sleeve 25 form an axial sliding constraint.

[0044] The limiting unit consists of a threaded sleeve 23 and a limiting sleeve 25. The inner side of the threaded sleeve 23 is provided with multiple axially extending inner limiting grooves 233. The limiting block 251 on the outer side of the limiting sleeve 25 is embedded in the groove 233, so that the limiting sleeve 25 can only slide axially. The inner side of the limiting sleeve 25 is provided with an axial limiting groove 252. The limiting protrusion 263 on the top of the piston rod 26 is embedded in the groove 252, thereby restricting the circumferential rotation of the piston rod 26 and allowing only its axial movement. This design ensures that when the drive housing 21 rotates, the first threaded rod 27 is restricted from rotating by the drive block 24, which pushes the second threaded rod 28 to move axially, thereby driving the piston rod 26 to move linearly through the threaded transmission.

[0045] Working principle: Ink absorption operation: Rotate the drive housing 21 counterclockwise, and the drive block 24 drives the first threaded rod 27 to rotate. Due to the threaded engagement between the first threaded rod 27 and the second threaded rod 28, the second threaded rod 28 moves upward. When the second threaded rod 28 moves to its limit stroke, the piston rod 26 is driven upward by the thread of the second threaded rod 28, which drives the piston ring 261 to rise. A negative pressure is formed in the ink sac 22 to draw in ink. At the same time, the drive housing 21 moves upward along the thread of the threaded sleeve 23.

[0046] Ink discharge operation: Rotate the drive housing 21 clockwise, the first threaded rod 27 drives the second threaded rod 28 to move downward, the second threaded rod 28 drives the piston rod 26 to move downward, the piston rod 26 drives the piston ring 261 to squeeze the ink sac 22 downward, and discharge the remaining ink.

[0047] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A piston type fountain pen comprising a pen barrel (12), a pen grip (13), a pen point (14) and a rotating sleeve (15), a pen cap (11) being fitted outside the pen grip (13), characterized in that, Also include the ink absorber unit (2), the ink absorber unit (2) includes the ink absorber unit arranged inside the pen barrel (12) and the bearing unit; The bearing unit includes an ink bag (22) fixedly installed at the top end of the pen grip (13) and a driving shell (21) coaxially arranged above the ink bag (22), and the driving shell (21) is fixedly installed inside the rotating sleeve (15); The ink absorber unit includes a driving block (24), an axial movement unit, a limiting unit and a piston ring (261); The axial movement unit includes a first threaded rod (27), a second threaded rod (28) and a piston rod (26), the top end of the first threaded rod (27) is clamped with the driving block (24), the bottom end of the first threaded rod (27) is threadedly connected with the inner thread of the second threaded rod (28), the outer side of the second threaded rod (28) is threadedly connected with the inner side of the piston rod (26), the bottom end of the piston rod (26) is fixedly connected with the top of the piston ring (261), and the outer side of the piston rod (26) is fixedly installed with a limiting protrusion (263) at the top. The limiting unit includes a threaded sleeve (23) and a limiting sleeve (25), the threaded sleeve (23) is arranged at the top of the ink bag (22), a plurality of axially extending inner limiting grooves (233) are uniformly formed in the inner side of the threaded sleeve (23), the limiting sleeve (25) is slidably connected with the inner wall of the threaded sleeve (23), a plurality of limiting blocks (251) are fixedly installed at the top of the outer side of the limiting sleeve (25), the limiting blocks (251) are embedded in the inner limiting grooves (233) and slide axially along the inner limiting grooves (233), and an axial limiting groove (252) matched with the limiting protrusion (263) is formed in the inner side of the limiting sleeve (25), and the limiting protrusion (263) is embedded in the inner side of the limiting groove (252) and slides along the limiting groove (252).

2. A piston filler fountain pen according to claim 1, wherein The driving block (24) is fixedly installed at the top end of the inner side of the driving shell (21), the inner side of the driving block (24) is provided with a clamping groove, and the top end of the first threaded rod (27) is embedded in the clamping groove to limit the circumferential rotation of the first threaded rod (27).

3. A piston filler fountain pen according to claim 1, wherein The bottom end of the threaded sleeve (23) is provided with a lower thread (232), and the top end of the threaded sleeve (23) is provided with an upper thread (231), and the threaded sleeve (23) is fixedly connected with the top end of the inner side of the ink bag (22) through the lower thread (232).

4. A piston filler fountain pen according to claim 1, wherein The threaded sleeve (23) is threadedly connected with the bottom end of the inner side of the driving shell (21) through the upper thread (231).

5. A piston filler fountain pen according to claim 1, wherein The outer side of the piston ring (261) is provided with a plurality of grooves, and a sealing ring (262) is clamped in the grooves of the piston ring (261).

6. A piston filler fountain pen according to claim 1, wherein The limiting sleeve (25) is coaxially sleeved outside the piston rod (26), and the limiting protrusion (263) and the limiting groove (252) of the limiting sleeve (25) form axial sliding constraint.

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