Clutch assembly and injection pen

Abstract

This utility model belongs to the field of injection pen technology, and particularly relates to a clutch assembly and an injection pen. One type of clutch assembly includes: a clutch lever, a drive sleeve, a drive rod, and a clutch spring. The end of the clutch lever is engaged with the drive sleeve. The drive rod is disposed inside the drive sleeve. One end of the clutch spring abuts against the inner wall of the drive sleeve, and the other end abuts against the drive rod. During activation, the clutch lever drives the drive sleeve to move axially, compressing the clutch spring. After activation, the clutch spring drives the drive sleeve and clutch lever to axially reset away from the drive rod. By placing the clutch spring between the drive sleeve and the drive rod, not only is the stability of the injection pen's transition from the self-activated state to the reset state ensured, but also the need for a snap-fit ​​on the button is avoided, reducing manufacturing complexity.

Description

Technical Field

[0001] This utility model belongs to the field of injection pen technology, and particularly relates to clutch components and injection pens. Background Technology

[0002] An injection pen is a common medical device, mainly used to inject small amounts of drugs, such as insulin, adrenaline, or growth hormone.

[0003] In existing technology, the clutch spring is one of the main components enabling multiple injections in an injection pen. The clutch spring is typically positioned between the button and other clutch components. This necessitates the use of a buckle on the button or clutch component to engage with the clutch spring, ensuring that the clutch spring allows the injection pen to switch between the injection state and the post-injection state.

[0004] However, setting undercuts on buttons or clutch components increases the complexity of the component structure. Furthermore, undercut demolding requires special mold design, which increases the technical difficulty of the process.

[0005] Therefore, there is an urgent need to develop a clutch assembly and an injection pen.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Utility Model Content

[0007] This disclosure provides at least one clutch assembly and an injection pen.

[0008] In a first aspect, embodiments of this disclosure provide a clutch assembly, including: a clutch lever, a drive sleeve and a drive rod, a clutch spring, and the end of the clutch lever being engaged with the drive sleeve; The drive rod is disposed inside the drive sleeve, and one end of the clutch spring abuts against the inner wall of the drive sleeve, while the other end abuts against the drive rod. During activation, the clutch lever drives the drive sleeve to move axially to compress the clutch spring. After the excitation is completed, the clutch spring drives the drive sleeve and clutch rod to return to their axial position away from the drive rod.

[0009] In one optional embodiment, the outer wall of the drive rod is provided with an annular boss, the outer diameter of the annular boss is smaller than the inner diameter of the drive sleeve, the clutch spring is sleeved on the drive rod, and the other end of the clutch spring abuts against the annular boss.

[0010] In one optional embodiment, an annular stop is provided at one end of the drive sleeve near the clutch lever, and one end of the clutch spring abuts against the inner wall of the annular stop.

[0011] In one alternative embodiment, the annular baffle ring has a notch arranged circumferentially, and the clutch lever is provided with a locking block that engages with the notch.

[0012] In one alternative embodiment, after the clutch lever end engages with the drive sleeve, the clutch spring is located outside the clutch lever.

[0013] In one optional embodiment, the inner ring of the drive sleeve is evenly distributed with a plurality of first splines along the circumferential direction; The second splines are symmetrically and evenly distributed on the outer wall of the drive rod; During activation, the clutch lever drives the drive sleeve to move axially, and the second spline engages with the first spline.

[0014] In one optional embodiment, a limiting platform is provided at the end of the drive rod away from the clutch rod; A stop nut is fitted to the threaded outer wall of the drive rod, and the stop nut moves along the outer wall of the drive rod from the annular boss to the limiting platform.

[0015] In one optional embodiment, the outer wall of the termination nut is provided with at least one protrusion axially. The inner wall of the drive sleeve has an axially formed keyway that matches the protrusion, and the protrusion is slidably disposed in the keyway.

[0016] In one alternative embodiment, at least one elastic arm is provided on the outer wall of the drive rod near the second spline; When the drive rod rotates circumferentially, the elastic arm strikes the rack on the inner wall of the pen body to produce sound.

[0017] Secondly, embodiments of this disclosure also provide an injection pen, comprising: A dosage knob, wherein a gear on a rotating drum is provided inside the dosage knob, and the inner wall of the gear meshes with the teeth on the outer wall of the clutch lever; When the dosage knob is rotated in the forward direction, it drives the gear on the rotating drum to rotate synchronously with the clutch lever, so as to wind the coil spring in the coil spring bracket.

[0018] The beneficial effect of this utility model is that it provides a clutch assembly and injection pen. By placing the clutch spring between the drive sleeve and the drive rod, it solves the technical problems of complex structure and difficult mold demolding process when the traditional clutch spring is located at the button.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A perspective view of the clutch assembly provided in an embodiment of this disclosure; Figure 2 A perspective view of the clutch spring and drive lever provided in an embodiment of this disclosure; Figure 3 A cross-sectional perspective view of the drive sleeve provided in an embodiment of this disclosure; Figure 4 This is an internal sectional view of the drive sleeve provided in an embodiment of the present disclosure; Figure 5 A perspective view of the drive rod provided in an embodiment of this disclosure; Figure 6 Provided for the embodiments of this disclosure Figure 1 Front view sectional view from the perspective of AA.

[0023] In the picture: 1. Pen body; 2. Dosage knob; 20. Gear on the rotating drum; 21. Spring support; 3. Clutch lever; 4. Drive sleeve; 40. Annular stop; 41. First spline; 42. Keyway; 43. Notch; 5. Drive rod; 50. Annular boss; 51. Second spline; 52. Limiting platform; 53. Termination nut; 54. Protrusion; 55. Elastic arm; 6. Clutch spring. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has found that, among related technologies, the injection pen is a common medical device, mainly used for injecting small amounts of drugs, such as insulin, adrenaline, or growth hormone.

[0030] In existing technology, the clutch spring is one of the main components enabling multiple injections in an injection pen. The clutch spring is typically positioned between the button and other clutch components. This necessitates the use of a buckle on the button or clutch component to engage with the clutch spring, ensuring that the clutch spring allows the injection pen to switch between the injection state and the post-injection state.

[0031] However, setting undercuts on buttons or clutch components increases the complexity of the component structure. Furthermore, undercut demolding requires special mold design, which increases the technical difficulty of the process.

[0032] Therefore, there is an urgent need to develop a clutch assembly and an injection pen.

[0033] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figures 1 to 6 As shown, at least one embodiment provides a clutch assembly, including: a clutch rod 3, a drive sleeve 4, and a drive rod 5. One end of the clutch rod 3 is snapped and fixed to the end of the drive sleeve 4. The drive rod 5 is disposed inside the drive sleeve 4, and a clutch spring 6 is sleeved on the outer wall of the drive rod 5. One end of the clutch spring 6 abuts against the inner wall of the drive sleeve 4. During activation, the clutch rod 3 drives the drive sleeve 4 to move axially, compressing the clutch spring 6 to deform. After activation, the clutch spring 6 drives the drive sleeve 4 and the clutch rod 3 to axially reset away from the drive rod 5. By placing the clutch spring 6 between the drive sleeve 4 and the drive rod 5, the need for a snap-fit ​​on the button is avoided, simplifying the mold demolding process. This structure reduces the risk of stress concentration through axial movement rather than radial fixation. Furthermore, the linear compression of the clutch spring 6 is more uniform, improving durability.

[0037] Reference Appendix Figure 2 The drive rod 5 has an annular boss 50 fitted on its outer wall. The outer diameter of the annular boss 50 is smaller than the inner diameter of the drive sleeve 4, and the other end of the clutch spring 6 abuts against the annular boss 50. An annular stop 40 is provided at one end of the drive sleeve 4 near the clutch rod 3. One end of the clutch spring 6 abuts against the annular stop 40, and the other end abuts against the annular boss 50, forming a stable support point. The annular boss 50 and the annular stop 40 increase the stability of the clutch spring 6, preventing the injection pen from jamming during reset. The outer diameter of the annular boss 50 is slightly smaller than the inner diameter of the drive sleeve 4, ensuring smooth axial movement and reducing frictional loss.

[0038] Reference Appendix Figure 3 The inner diameter of the annular stop 40 is larger than the outer diameter of the clutch rod 3; wherein, after the end of the clutch rod 3 is engaged with the drive sleeve 4, the clutch spring 6 is located outside the clutch rod 3. The inner diameter allowance of the stepped contact surface allows for slight radial deviation, avoiding assembly stress. The annular stop 40 has a notch 43 arranged circumferentially, and the clutch rod 3 is provided with a locking block that mates with the notch 43. The engagement of the locking block and the notch 43 achieves the engagement of the clutch rod 3 with the drive sleeve 4.

[0039] Reference Appendix Figure 3 and Figure 4 The inner ring of the drive sleeve 4 has several first splines 41 evenly distributed circumferentially; the outer wall of the drive rod 5 has second splines 51 symmetrically distributed. During activation, the second splines 51 mesh with the first splines 41 to transmit torque. During activation, the axial movement of the clutch rod 3 compresses the clutch spring 6. After the first splines 41 and second splines 51 mesh, the coil spring drives synchronous rotation, reducing the number of components linked and lowering the probability of failure.

[0040] Reference Appendix Figure 4 and Figure 5 A limiting platform 52 is provided at the end of the drive rod 5 away from the clutch rod 3; a terminating nut 53 is threadedly fitted onto the outer wall of the drive rod 5, and the terminating nut 53 moves along the outer wall of the drive rod 5 from the annular boss 50 toward the limiting platform 52. At least one protrusion 54 is axially provided on the outer wall of the terminating nut 53; a keyway 42 adapted to the protrusion 54 is axially formed on the inner wall of the drive sleeve 4, and the protrusion 54 is slidably disposed within the keyway 42. The limiting platform 52 ensures that the terminating nut 53 can only move between the limiting platform 52 and the annular boss 50. The cooperation between the protrusion 54 and the keyway 42 allows the terminating nut 53 to rotate synchronously with the drive sleeve 4 and also allows for axial displacement relative to the drive sleeve 4.

[0041] Reference Appendix Figure 4At least one elastic arm 55 is provided on the outer wall of the drive rod 5 near the second spline 51; wherein, when the drive rod 5 rotates circumferentially, the elastic arm 55 strikes the rack on the inner wall of the pen body 1 to produce sound.

[0042] At least one embodiment provides an injection pen, including: a pen body 1 and a dosage knob 2, the dosage knob 2 being rotatably disposed at one end of the pen body 1, and a rotating gear 20 being disposed inside the dosage knob 2, the inner wall of which meshes with the teeth on the clutch lever 3; wherein, when the dosage knob 2 rotates in the forward direction, it drives the rotating gear 20 to rotate synchronously with the clutch lever 3 to wind the coil spring inside the coil spring bracket 21.

[0043] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0045] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A clutch assembly, comprising: The clutch lever (3), drive sleeve (4), and drive rod (5), and clutch spring (6) are characterized by: The end of the clutch lever (3) is engaged with the drive sleeve (4); The drive rod (5) is disposed inside the drive sleeve (4), and one end of the clutch spring (6) abuts against the inner wall of the drive sleeve (4) and the other end abuts against the drive rod (5); When activated, the clutch lever (3) drives the drive sleeve (4) to move axially to compress the clutch spring (6) and deform it. After the excitation is completed, the clutch spring (6) drives the drive sleeve (4) and the clutch rod (3) to return to their axial position away from the drive rod (5).

2. The clutch assembly as described in claim 1, characterized in that, The outer wall of the drive rod (5) is provided with an annular boss (50), the outer diameter of the annular boss (50) is smaller than the inner diameter of the drive sleeve (4), the clutch spring (6) is sleeved on the drive rod (5), and the other end of the clutch spring (6) abuts against the annular boss (50).

3. The clutch assembly as described in claim 2, characterized in that, The drive sleeve (4) is provided with an annular stop (40) at one end near the clutch rod (3), and one end of the clutch spring (6) abuts against the inner wall of the annular stop (40).

4. The clutch assembly as described in claim 3, characterized in that, The annular baffle ring (40) has a notch (43) arranged circumferentially, and the clutch rod (3) is provided with a locking block that cooperates with the notch (43).

5. The clutch assembly as described in claim 3, characterized in that, After the end of the clutch lever (3) is engaged with the drive sleeve (4), the clutch spring (6) is located outside the clutch lever (3).

6. The clutch assembly as claimed in claim 1, characterized in that, The inner ring of the drive sleeve (4) has several first splines (41) evenly distributed around the circumference. The drive rod (5) has second splines (51) symmetrically distributed on its outer wall. During activation, the clutch lever (3) drives the drive sleeve (4) to move axially, and the second spline (51) meshes with the first spline (41).

7. The clutch assembly as claimed in claim 2, characterized in that, A limiting platform (52) is provided at the end of the drive rod (5) away from the clutch rod (3). A stop nut (53) is fitted on the threaded outer wall of the drive rod (5). The stop nut (53) moves along the outer wall of the drive rod (5) from the annular boss (50) toward the limiting platform (52).

8. The clutch assembly as claimed in claim 7, characterized in that, The outer wall of the termination nut (53) is provided with at least one protrusion (54) axially. The inner wall of the drive sleeve (4) is axially provided with a keyway (42) that is adapted to the protrusion (54), and the protrusion (54) is slidably disposed in the keyway (42).

9. The clutch assembly as claimed in claim 6, characterized in that, At least one elastic arm (55) is provided on the outer wall of the drive rod (5) near the second spline (51); When the drive rod (5) rotates circumferentially, the elastic arm (55) strikes the rack on the inner wall of the pen body (1) to produce sound.

10. An injection pen, characterized in that... The clutch assembly as described in any one of claims 1-9 comprises: Dosage knob (2), wherein a rotating gear (20) is provided inside the dosage knob (2), and its inner wall meshes with the teeth on the outer wall of the clutch lever (3); When the dosage knob (2) rotates in the forward direction, it drives the gear (20) on the rotating drum to rotate synchronously with the clutch rod (3) to wind the coil spring in the coil spring bracket (21).

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