Special-shaped shell of water storage device of direct-liquid type drawing pen

Abstract

A special-shaped shell of a water storage device of a direct-liquid type drawing pen comprises a matching section which is arranged on the outer portion of a matching portion of the water storage device, the section of the matching section is in a circular ring shape, and the inner circle portion of the matching section is matched with the matching portion of the water storage device; and the outer part of the section of the holding section is a non-circular special-shaped section. The tool further comprises a transition section, the transition section is connected with the matching section and the holding section, and the transition section is a chamfer arranged on the holding section so as to reduce stress concentration between the matching section and the holding section.

Description

Technical Field

[0001] The present invention relates to the manufacturing technology of writing tools, and particularly to a special-shaped outer shell of a water storage device for a direct liquid drawing pen, the outer contour of the pen tube being special-shaped. Background Art

[0002] A direct liquid drawing pen at least includes a circular water storage device and an outer shell that cooperates with the water storage device, and the water storage device is installed at the holding end close to the pen tip. When the water storage device cooperates with the outer shell, a cylindrical mating portion about 1 - 2 mm thick at the top of the water storage device is used for mating, and the mating accuracy is about 0.01 mm. Since the mating portion of the water storage device is circular, the outer shell that mates with it is also circular. However, the comfort of holding a circular outer shell is poor. Although there is a triangle in non-direct liquid pens, since there are no components inside that need to be mated, the processing is relatively simple. However, since the inner wall of the direct liquid drawing pen needs to cooperate with the water storage device, if the outer shell is made into a special shape (such as a triangle), due to the uneven wall thickness, during the cooling and shrinkage process after injection molding, the difference in the cooling rate between the circular section and the triangular section leads to stress concentration, and the degree of shrinkage with an out-of-tolerance deformation amount is different, which will cause the roundness value inside the outer shell to be insufficient, resulting in insufficient mating accuracy with the water storage device and thus ink leakage. Summary of the Invention

[0003] Technical Problem

[0004] To solve the problems of seal failure and assembly difficulty caused by injection molding deformation of a pen tube with a circular inner cross-section and a special-shaped outer cross-section, and at the same time improve the holding comfort.

[0005] Technical Solution

[0006] A special-shaped outer shell of a water storage device for a direct liquid drawing pen, comprising:

[0007] A mating section: arranged at the outer position of the mating portion of the water storage device, having an annular cross-section, and its inner circular part mates with the mating portion of the water storage device;

[0008] A holding section: having a non-circular special-shaped cross-section at its outer part.

[0009] Preferably, it further includes a transition section, the transition section connecting the mating section and the holding section, and the transition section being a chamfer provided on the holding section to reduce stress concentration between the mating section and the holding section.

[0010] Preferably, the holding section further includes an outer protrusion, and the outer protrusion has an interference fit with the inner wall of the pen cap.

[0011] Preferably, it further includes a special-shaped pen cap that mates with the special-shaped outer shell.

[0012] Preferably, inner protrusions are provided on the inner wall of the special-shaped pen cap, and the outer protrusion has an interference fit with the inner protrusions.

[0013] Preferably, it further includes a circular threaded section and a special-shaped pen barrel. One end of the special-shaped pen barrel is provided with an internal thread, which is matched with the circular threaded section. After the special-shaped pen cap is inserted into the special-shaped outer shell, it can be matched with the end face of the special-shaped pen barrel.

[0014] Preferably, it further includes a special-shaped middle section, which is arranged outside the fitting section and can at least block the fitting section. The two end faces of the special-shaped middle section are respectively matched with the special-shaped pen cap and the special-shaped pen barrel.

[0015] Preferably, the shape of the special-shaped cross-section is triangle outside a circle, square outside a circle or ellipse outside a circle.

[0016] Beneficial effects

[0017] The problem of sealing failure is solved, and the comfort of holding the pen is improved. Brief description of the drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention with a triangular special shape.

[0019] Figure 2 It is a sectional view of the present invention with a triangular special shape including a water storage device.

[0020] Figure 3 It is a sectional view of the present invention with a triangular special shape without a water storage device.

[0021] Figure 4 It is a sectional view of the holding section of the present invention with a triangular special shape.

[0022] Figure 5 It is a sectional view of the fitting section of the present invention with a triangular special shape.

[0023] Figure 6 It is a structural diagram of the present invention with a triangular special shape including a pen cap and a pen barrel.

[0024] Figure 7 It is a structural diagram of the present invention with a triangular special shape after removing the special-shaped middle section.

[0025] Figure 8 It is a sectional view of the holding section of the present invention with a square special shape.

[0026] Figure 9 It is a sectional view of the fitting section of the present invention with a square special shape.

[0027] Figure 10 It is a sectional view of the holding section of the present invention with an elliptical special shape.

[0028] Figure 11 It is a sectional view of the fitting section of the present invention with an elliptical special shape.

[0029] In the figure: 1 - mating section, 2 - transition section, 3 - outer protrusion, 4 - gripping section, 5 - water reservoir mating portion, 6 - water reservoir, 7 - special-shaped pen cap, 8 - special-shaped middle section, 9 - special-shaped pen barrel. Specific embodiments

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0033] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the terms "installed", "set", "provided with", "connected", "linked", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] A special-shaped outer shell of a water storage device of a direct liquid painting pen, comprising:

[0037] Fitting section 1: It is arranged at the outer position of the water storage device fitting part 5, and its cross-section is an annular shape. The inner circular part thereof cooperates with the water storage device fitting part 5;

[0038] Grip section 4: The outer cross-section thereof is a non-circular special-shaped cross-section.

[0039] Since the cross-section of the fitting section 1 is an annular shape and the thickness of each part is the same, the same cooling rate can be ensured during injection molding and cooling, and the cross-section after cooling is still a precise circle, avoiding the problem of insufficient roundness after cooling due to different thicknesses. During assembly, the outer diameter of the water storage device fitting part 5 cooperates with the inner diameter of the fitting section 1 to ensure tight sealing and no ink leakage.

[0040] Preferably, it further includes a transition section 2. The transition section 2 connects the fitting section 1 and the grip section 4, and the transition section 2 is a chamfer provided on the grip section 4 to reduce the stress concentration between the fitting section 1 and the grip section 4. It can further stabilize the roundness of the fitting section 1 after cooling, and also make the outer shell have a better streamline shape, which is convenient for processing.

[0041] Preferably, the grip section 4 further includes an outer protrusion 3, and the outer protrusion 3 has an interference fit with the inner wall of the pen cap. The outer protrusion 3 can be several points evenly distributed along the circumferential direction, or a circle distributed along the entire circumference.

[0042] Preferably, it further includes a special-shaped pen cap 7 that cooperates with the special-shaped outer shell. The cross-section of the special-shaped pen cap 7 has a similarity to the shape of the outside of the cross-section of the special-shaped outer shell to ensure the cooperation between the special-shaped pen cap 7 and the special-shaped outer shell.

[0043] Preferably, the inner wall of the special-shaped pen cap 7 is provided with an inner protrusion, and the outer protrusion 3 has an interference fit with the inner protrusion. The inner protrusion can be several points evenly distributed along the circumferential direction, or a circle distributed along the entire circumference. The inner wall of the special-shaped pen cap 7 and the outer wall of the special-shaped outer shell are in clearance fit.

[0044] Preferably, it further includes a circular threaded section and a special-shaped pen barrel 9. One end of the special-shaped pen barrel 9 is provided with internal threads, and the internal threads are engaged with the circular threaded section. After the special-shaped pen cap 7 is inserted into the special-shaped outer shell, it can be engaged with the end face of the special-shaped pen barrel 9.

[0045] Preferably, it further includes a special-shaped middle section 8. The special-shaped middle section 8 is arranged outside the fitting section 1 and can at least cover the fitting section 1. The two end faces of the special-shaped middle section are respectively engaged with the special-shaped pen cap 7 and the special-shaped pen barrel 9.

[0046] Preferably, the shape of the special-shaped cross-section is a triangle outside a circle, a quadrilateral outside a circle, an ellipse outside a circle, or other similar shapes.

[0047] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. The special-shaped outer shell of the water storage device of a direct liquid painting pen, characterized in that: Comprising: Fitting section: Arranged at an external position of the fitting part of the water storage device, having an annular cross-section, and its inner circular part is fitted with the fitting part of the water storage device; Grip section: The external cross-section thereof is a non-circular special-shaped cross-section.

2. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: It further includes a transition section. The transition section connects the fitting section and the grip section, and the transition section is a chamfer provided on the grip section to reduce the stress concentration between the fitting section and the grip section.

3. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: The grip section further includes an external protrusion, and the external protrusion is in interference fit with the inner wall of the pen cap.

4. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: It further includes a special-shaped pen cap that fits with the special-shaped outer shell.

5. The special-shaped outer shell of the water storage device of a direct liquid drawing pen according to claim 1, characterized in that: Inner protrusions are provided on the inner wall of the special-shaped pen cap, and the external protrusion is in interference fit with the inner protrusions.

6. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: It further includes a circular threaded section and a special-shaped pen rod. An internal thread is provided at one end of the special-shaped pen rod, and the internal thread is fitted with the circular threaded section. After the special-shaped pen cap is inserted into the special-shaped outer shell, it can be fitted with the end face of the special-shaped pen rod.

7. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: It further includes a special-shaped middle section. The special-shaped middle section is arranged outside the fitting section and can at least cover the fitting section. The two end faces of the special-shaped middle section are respectively fitted with the special-shaped pen cap and the special-shaped pen rod.

8. The special-shaped outer shell of the water storage device of a direct liquid painting pen according to claim 1, characterized in that: The shape of the special-shaped cross-section includes but is not limited to an inner circle and an outer triangle or an inner circle and an outer quadrilateral or an inner circle and an outer ellipse.

Images