Pen with automatic refill stretching and retracting function

Abstract

The utility model discloses a pen with a refill automatic telescopic function, which comprises a penholder and a refill, a lock rod, an inner lock sleeve, an outer lock sleeve and a ball are respectively arranged in the penholder, the lock rod is connected to the rear end of the refill and can synchronously move back and forth with the refill, a first spring is arranged between the outer lock sleeve and the penholder, and the ball is arranged in the outer lock sleeve. The outer lock sleeve and the lock rod are in pushing fit, the outer lock sleeve, the lock rod and the refill are driven by the first spring to move backwards when the pen is transversely arranged, and the outer lock sleeve, the lock rod and the refill resist the first spring to move forwards under the action of gravity when the pen is vertically arranged in the direction that the pen point faces downwards. When the pen with the automatic refill stretching and retracting function is transversely arranged, the refill retracting process can be automatically completed, the operation is simpler and more convenient, and the use logic is better met.

Description

Technical Field

[0001] This utility model relates to a pen with an automatic retractable pen refill function. Background Technology

[0002] Currently, a Chinese invention patent (patent number CN106274162B) discloses a writing instrument with an innovative design and an attached telescopic component. This writing instrument has a sophisticated structure, mainly composed of a pen barrel, a refill, an advance / retractor, a rolling element, a recess, a locking mechanism, a retainer, and a telescopic component, all carefully assembled together. Its unique feature is that when the telescopic component faces downwards, it automatically extends under gravity and locks in the extended position, greatly facilitating the writing process. When writing is finished and no longer needed, simply flipping the telescopic component upwards automatically unlocks it and retracts it into the pen barrel, cleverly enhancing the user experience.

[0003] However, in practical use, people often habitually place the pen horizontally on a table when not in use. In this case, the retractable step of turning the telescopic component upwards, as mentioned in the patent, while ingeniously designed, still presents some inconvenience in operation. This may affect the convenience of the writing instrument in daily use. Therefore, further optimization and improvement of the patented recording scheme to better adapt to user habits is a direction worth exploring. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a pen with an automatic retractable refill function, which can automatically complete the refill retraction process when placed horizontally.

[0005] This utility model discloses a pen with an automatic retractable refill function, comprising a pen barrel and a pen refill. The pen barrel contains a locking rod, an inner locking sleeve, an outer locking sleeve, and a ball bearing. The locking rod is connected to the rear end of the pen refill and can move back and forth synchronously with it. The locking rod includes an annular groove. The inner locking sleeve is fixedly connected to the pen barrel and remains relatively stationary. The inner locking sleeve is fitted over the outer side of the locking rod and can move back and forth relative to it. The inner locking sleeve has several through slots evenly distributed circumferentially to accommodate the ball bearing, each slot accommodating one ball bearing. These slots extend through the inner and outer sides of the inner locking sleeve, allowing a portion of the ball bearing located in the slot to extend outwards or inwards. The outer locking sleeve is fitted over the outer side of the inner locking sleeve and can move back and forth relative to it. The inner hole of the outer locking sleeve includes a first section and a second section with a smaller diameter than the first section. The pen includes a tapered transition section connecting the first and second hole sections. A first spring is provided between the outer locking sleeve and the pen barrel. The outer locking sleeve and the locking rod form a push-fit. When the pen is placed horizontally, the outer locking sleeve, locking rod, and pen refill are driven to move backward by the first spring. Specifically, the first spring acts on the outer locking sleeve and pushes it to move backward. When the outer locking sleeve moves backward, it can also push the locking rod to move backward. When the locking rod moves backward, it drives the pen refill to move backward, causing the pen refill to retract. When the pen is placed vertically with the pen tip pointing downward, the outer locking sleeve, locking rod, and pen refill resist the first spring from moving forward under the action of gravity. Specifically, the outer locking sleeve, locking rod, and pen refill move forward under the action of gravity. At the same time, through the push-fit of the outer locking sleeve and locking rod, the gravity of the locking rod and pen refill is also applied to the outer locking sleeve, jointly resisting the forward movement of the first spring.

[0006] When the pen is needed, it is placed vertically. The pen refill, locking lever, and outer locking sleeve move forward against the elastic force of the first spring under the action of gravity. At the same time, the inner locking sleeve, outer locking sleeve, locking lever, and ball joint work together to lock the locking lever, ensuring normal writing. When the pen is not needed, it is placed horizontally on the table. At this time, since the direction of gravity of the pen refill, locking lever, and outer locking sleeve is no longer opposite to the direction of the first spring, the pen refill, locking lever, and outer locking sleeve are driven by the first spring to move backward. At the same time, the locking lever can be unlocked, allowing the pen refill to retract automatically. The operation is quite convenient.

[0007] Furthermore, the outer locking sleeve includes a front part, a rear part, and a counterweight located between the front and rear parts. The first hole section, the second hole section, and the tapered transition section are all located at the rear part of the outer locking sleeve. The first spring abuts against the front part of the outer locking sleeve and the front part of the pen barrel's inner hole. The counterweight improves the falling effect of the outer locking sleeve and also enhances the pushing effect on the ball. Placing the first spring between the front part of the outer locking sleeve and the front part of the pen barrel's inner hole results in a simple, compact structure that is easy to assemble.

[0008] Furthermore, the front end of the outer locking sleeve includes a plug-in portion and an annular flange disposed behind the plug-in portion. The rear end of the first spring is plugged into the outer side of the plug-in portion and forms an abutting fit with the front end of the annular flange. The front part of the inner hole of the pen barrel is provided with an annular stepped surface. The front end of the first spring abuts against the annular stepped surface, improving the cooperation effect with the first spring and ensuring the stability of the direction of the elastic force.

[0009] Furthermore, the front end of the front part and the front end of the rear part of the outer locking sleeve are provided with insertion parts, and the front of the insertion parts at the front end and the rear of the insertion parts at the rear part are provided with annular flanges. The counterweight part is a cylindrical structure with an inner hole for accommodating and moving the pen refill. The front and rear ends of the counterweight part are respectively connected to the insertion parts at the front end and the front end of the rear part of the outer locking sleeve to form a fixed insertion fit. The front and rear ends of the counterweight part are also respectively connected to the annular flanges at the front and rear of the outer locking sleeve to form a limiting fit. The structure is simple and easy to install.

[0010] Furthermore, the counterweight is made of tightly wound metal wire in a spiral shape, which helps to increase the overall weight of the outer lock sleeve. The counterweight is also easy to manufacture and has a low cost.

[0011] Furthermore, at least the portion of the pen barrel corresponding to the counterweight is made of transparent material, allowing the movement of the counterweight to be observed directly from the outside, thus enhancing the pen's aesthetic appeal and entertainment value.

[0012] Furthermore, the locking rod and the pen refill are connected by a pen refill support. The front end of the pen refill support is provided with a plug-in post and a retaining ring located behind the plug-in post. The plug-in post and the rear end of the pen refill ink tube are engaged and positioned, and the retaining ring and the rear end of the pen refill ink tube are engaged and limited. The structure is simple and easy to install. There is a gap between the plug-in post, the retaining ring and the pen refill ink tube of the pen refill support to achieve air pressure balance inside and outside the ink tube and ensure good ink output effect.

[0013] Furthermore, the rear end of the pen refill support and the front end of the locking rod form a plug-in fixed fit. Specifically, a plug hole can be provided at the rear end of the pen refill support, and the front end of the locking rod is plugged into and fixed in the plug hole by a tight fit.

[0014] Furthermore, a limiting block is provided at the rear end of the locking rod. The limiting block, the rear end of the outer locking sleeve, and the rear end of the inner locking sleeve form a limiting fit. When the pen is placed vertically with the pen tip facing down, the weight of the locking rod and the pen refill can be applied to the outer locking sleeve through the limiting block of the locking rod to jointly resist the elastic force of the first spring. When the pen is placed horizontally, when the outer locking sleeve moves backward under the push of the first spring, the limiting block of the locking rod pushes the locking rod and the pen refill to move backward. The through groove and the annular groove are in a relatively aligned state when the limiting block of the locking rod abuts against the rear end of the inner locking sleeve, to prevent the annular groove from deviating from the through groove due to excessive forward movement, thus ensuring reliable locking of the pen refill.

[0015] Furthermore, a second spring is provided between the pen refill and the pen barrel. The second spring provides a backward elastic force to the pen refill. Since there are gaps between the ball, the ring groove, and the through groove, the pen refill is prone to shaking during writing. The second spring can reduce the shaking of the pen refill during writing and improve the writing experience of the pen.

[0016] The beneficial effects of this utility model are: compared with the existing technology where the pen needs to be inverted during the refilling operation, the pen of this utility model can automatically refill by simply placing the pen flat on the table, making the operation simpler and more convenient. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view of an embodiment of the present invention in the core-shrinking state. Figure 1 ;

[0018] Figure 2 This is a partial cross-sectional view of an embodiment of the present invention in the core-shrinking state. Figure 2 ;

[0019] Figure 3 This is a partial cross-sectional view of an embodiment of the present invention in the core-extraction state. Figure 1 ;

[0020] Figure 4 This is a partial cross-sectional view of an embodiment of the present invention in the core-extraction state. Figure 2 ;

[0021] Figure 5 This is a cross-sectional view of the outer locking sleeve according to an embodiment of the present utility model;

[0022] Figure 6 for Figure 5 A magnified view of a portion of the image. Detailed Implementation

[0023] The structure of the pen with automatic retractable pen refill function in this embodiment of the utility model is as follows: Figure 1-6As shown, the device includes a pen barrel 1 and a pen refill 2. The pen barrel 1 contains a locking rod 3, an inner locking sleeve 4, an outer locking sleeve 5, and a ball bearing 6. The locking rod 3 is connected to the rear end of the pen refill 2 and can move back and forth synchronously with it. The locking rod 3 includes an annular groove 31. The inner locking sleeve 4 is fixedly connected to the pen barrel 1 and maintains a relatively stationary position relative to it. The inner locking sleeve 4 is fitted onto the outside of the locking rod 3 and can move back and forth relative to it. The inner locking sleeve 4 has several through slots 41 evenly distributed circumferentially to accommodate the ball bearing 6. Each through slot 41 can accommodate one ball bearing 6. The through slots 41 extend between the inner and outer sides of the inner locking sleeve 4, thus ensuring the ball bearing 6 within the through slots 41 is properly positioned. The outer locking sleeve 5 can extend outward or inward from the through groove 41. It is fitted over the outer side of the inner locking sleeve 4 and can move back and forth relative to the inner locking sleeve 4. The inner hole of the outer locking sleeve 5 includes a first hole section 501, a second hole section 502 with a smaller diameter than the first hole section 501, and a tapered transition section 503 connecting the first hole section 501 and the second hole section 502. The first hole section 501 is located in front of the second hole section 502. When the first hole section 501 of the outer locking sleeve 5 is in a position corresponding to the through groove 41 of the inner locking sleeve 4, there is a large gap between the inner wall of the first hole section 501 and the inner locking sleeve 5, allowing for partial insertion of the ball 6. When the outer locking... When the second hole section 502 of the sleeve 5 is positioned corresponding to the through groove 41 of the inner locking sleeve 4, it is blocked by the inner wall of the second hole section 502, which restricts the movement of the ball 6 towards the outer locking sleeve 5. Furthermore, when the annular groove 31 of the locking rod 3 is aligned with the through groove 41, a portion of the ball 6 can extend into the annular groove 31. When the annular groove 31 and the through groove 41 are not aligned, it is blocked by the side wall of the locking rod 3, which restricts the movement of the ball 6 towards the locking rod 3. A first spring 72 is provided between the outer locking sleeve 5 and the pen barrel 1, forming a push-fit mechanism between the outer locking sleeve 5 and the locking rod 3. When the pen is placed horizontally, the outer locking sleeve 5, the locking rod 3, and the pen core 2 are driven by the first spring 72. The pen moves backward. Specifically, the first spring 72 acts on the outer locking sleeve 5 and pushes the outer locking sleeve 5 to move backward. When the outer locking sleeve 5 moves backward, it can also push the locking rod 3 to move backward. When the locking rod 3 moves backward, it drives the pen refill 2 to move backward, causing the pen refill 2 to retract. When the pen is placed vertically with the pen tip facing down, the outer locking sleeve 5, locking rod 3, and pen refill 2 move forward under the action of gravity, resisting the first spring 72. Specifically, the outer locking sleeve 5, locking rod 3, and pen refill 2 move forward under the action of gravity. At the same time, through the pushing and cooperating of the outer locking sleeve 5 and locking rod 3, the gravity of the locking rod 3 and pen refill 2 is also applied to the outer locking sleeve 5, jointly resisting the forward movement of the first spring 72.

[0024] like Figure 3 , 4As shown, when the pen is needed, it is placed vertically with the pen tip facing down. At this time, the weight of the pen refill 2, locking lever 3, and outer locking sleeve 5 is directed towards the pen tip. Under the action of gravity, they jointly resist the elastic force of the first spring 72 and move forward. When the annular groove 31 and through groove 41 of the locking lever 3 are aligned, the ball 6 moves towards the locking lever 3 under the push of the conical transition section 503 of the outer locking sleeve 5, partially inserting into the annular groove 31. Since the ball 6 is simultaneously located within the space formed by the annular groove 31, through groove 41, and the inner wall of the second hole section 502, it can restrict the relative movement of the inner locking sleeve 4 and locking lever 3, preventing the locking lever 3 from moving backward, and thus preventing the pen refill 2 from moving backward, keeping the pen refill 2 in the extended state so that the pen refill 2 will not retract when the pen is writing normally. Figure 1 , 2 As shown, when the pen is not in use, it is placed horizontally on the table. At this time, the weight of the pen refill 2, locking rod 3, and outer locking sleeve 5 is directed towards the side of the pen. The outer locking sleeve 5 moves backward under the action of the first spring 72. When the first hole section 501 of the outer locking sleeve 5 is aligned with the through groove 41, the ball 6 is partially dislodged from the annular groove 31 under the push of the locking rod 3, releasing the restriction on the locking rod 3. The locking rod 3 and the pen refill 2 move backward under the push of the outer locking sleeve 5, realizing automatic refill retraction. The refill retraction operation does not require the pen to be inverted, making the operation faster and more convenient.

[0025] It should be noted that when the locking lever 3 moves backward, it uses the component force of the contact between its spherical surface and the ball 6 to drive it out of the annular groove 31. In order to avoid jamming and improve the pushing effect of the ball 6, the annular groove 31 is designed to have an arc-shaped concave wall.

[0026] In addition, due to the action of the first spring 72, when the outer locking sleeve 5, pen refill 2, locking rod 3 and other components move forward under the action of gravity, they can be buffered, making it less likely to cause a large degree of collision, and reducing vibration and noise.

[0027] like Figure 5 As shown, the outer locking sleeve 5 includes a front part 51, a rear part 52, and a counterweight part 53 located between the front part 51 and the rear part 52. The first hole section 501, the second hole section 502, and the tapered transition section 503 are all located in the rear part 52 of the outer locking sleeve 5. The first spring 72 abuts against the front part 51 of the outer locking sleeve 5 and the front part of the inner hole of the pen barrel 1. The counterweight part 53 can improve the falling effect of the outer locking sleeve 5 (the movement effect when the direction of gravity is the same as the direction of the pen tip), and can also improve the pushing effect on the ball 6. The first spring 72 is located between the front part 51 of the outer locking sleeve 5 and the front part of the inner hole of the pen barrel 1, which has a simple and compact structure and is easy to assemble.

[0028] The front end of the front part 51 of the outer locking sleeve 5 includes a plug part 511 and an annular flange 512 disposed behind the plug part 511. The rear end of the first spring 72 is plugged into the outside of the plug part 511 and forms an abutting fit with the front end of the annular flange 512. The front part of the inner hole of the pen barrel 1 is provided with an annular stepped surface 11. The front end of the first spring 72 abuts against the annular stepped surface 11, which improves the cooperation effect with the first spring 72 and ensures the stability of the direction of the elastic force.

[0029] The rear end of the front part 51 and the front end of the rear part 52 of the outer locking sleeve 5 are provided with insertion parts (513, 521). The insertion part 513 at the rear end of the front part 51 is located behind the annular flange 512, and the annular flange 522 is provided behind the insertion part 521 of the rear part 52. The counterweight part 53 is a cylindrical structure with an inner hole for accommodating and moving the pen refill 2. The front and rear ends of the counterweight part 53 are respectively connected to the insertion part 513 at the rear end of the front part 51 and the insertion part 521 at the front end of the rear part 52 of the outer locking sleeve 5 to form a fixed insertion fit. The front and rear ends of the counterweight part 53 are also respectively connected to the annular flanges (512, 522) of the front part 51 and the rear part 52 of the outer locking sleeve 5 to form a limiting fit. The structure is simple and easy to install.

[0030] like Figure 5 As shown, the counterweight 53 is made of metal wire tightly wound in a spiral shape, which helps to increase the overall weight of the outer locking sleeve 5 and improve its falling effect. In addition, the counterweight 53 is easy to manufacture and has a low cost.

[0031] The pen barrel 1 is made of transparent material at least in the part corresponding to the counterweight 53, so that the movement of the counterweight 53 can be observed directly from the outside, thus improving the pen's aesthetics and interest.

[0032] The locking rod 3 and the pen refill 2 are connected by a pen refill support 8. The front end of the pen refill support 8 is provided with a plug post 81 and a retaining ring 82 located behind the plug post 81. The plug post 81 and the rear end of the ink tube of the pen refill 2 are engaged and positioned. The retaining ring 82 and the rear end of the ink tube of the pen refill 2 are engaged and limited. The structure is simple and easy to install. There is a gap between the plug post 81, the retaining ring 82 and the ink tube of the pen refill 2, which is achieved by opening air grooves on the plug post 81 and the retaining ring 82 to achieve air pressure balance inside and outside the ink tube and ensure good ink output effect. The rear end of the pen refill support 8 and the front end of the locking rod 3 are engaged and fixed. Specifically, the rear end of the pen refill support 8 is provided with a socket 83, and the front end of the locking rod 3 is engaged and fixed in the socket 83 by a tight fit.

[0033] A limiting block 9 is fixedly connected to the rear end of the locking rod 3. The limiting block 9 cooperates with the rear end of the outer locking sleeve 5 and the rear end of the inner locking sleeve 4 for limiting. The limiting block 9 can cooperate with the rear end of the outer locking sleeve 5 for limiting. When the pen is placed vertically with the pen tip facing down, the weight of the locking rod 3 and the pen tip 2 can be applied to the outer locking sleeve 5 through the limiting block 9 of the locking rod 3 to jointly resist the elastic force of the first spring 72. When the pen is placed horizontally, when the outer locking sleeve 5 moves backward under the push of the first spring 72, the limiting block 9 of the locking rod 3 pushes the locking rod 3 and the pen tip 2 to move backward. The limiting block 9 of the locking rod 3 can also cooperate with the rear end of the inner locking sleeve 4 for limiting. When the locking rod 3 moves forward to the end position of the movement path (that is, when the limiting block 9 and the rear end of the inner locking sleeve 4 abut together), the annular groove and the through groove 41 can be aligned, preventing the annular groove 31 from deviating from the through groove 41 due to excessive forward movement, thus ensuring reliable locking of the pen tip 2.

[0034] Furthermore, a second spring 71 is provided between the pen refill 2 and the pen barrel 1. The second spring 71 provides a backward elastic force to the pen refill. Due to the gaps between the ball bearing 6, the annular groove 31, and the through groove 41, the pen refill 2 is prone to shaking during writing. The second spring 71 can reduce the shaking of the pen refill 2 during writing and improve the writing experience. An annular stepped surface 12 is also provided at the front of the inner hole of the pen barrel 1. The front end of the second spring 71 abuts against the annular stepped surface 12, improving the cooperation effect between the second spring 71 and ensuring the stability of the direction of the elastic force.

[0035] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A pen with an automatic retractable refill function, comprising a pen barrel and a pen refill, wherein a locking rod, an inner locking sleeve, an outer locking sleeve, and a ball are respectively disposed inside the pen barrel; the locking rod is connected to the rear end of the pen refill and can move back and forth synchronously with the pen refill; the locking rod includes an annular groove; the inner locking sleeve is fixedly connected to the pen barrel; the inner locking sleeve is fitted outside the locking rod and can move back and forth relative to the locking rod; the inner locking sleeve is circumferentially provided with a plurality of through grooves for accommodating the ball, the through grooves being disposed between the inner and outer sides of the inner locking sleeve; the outer locking sleeve is fitted outside the inner locking sleeve and can move back and forth relative to the inner locking sleeve; the inner hole of the outer locking sleeve includes a first hole section, a second hole section with a smaller diameter than the first hole section, and a tapered transition section connecting the first hole section and the second hole section, characterized in that: A first spring is provided between the outer locking sleeve and the pen barrel, and the outer locking sleeve and the locking rod form a push-fit. When the pen is placed horizontally, the outer locking sleeve, the locking rod and the pen refill are driven to move backward by the first spring. When the pen is placed vertically with the pen tip facing down, the outer locking sleeve, the locking rod and the pen refill are resisted by gravity and move forward against the first spring.

2. The pen with automatic retractable refill function according to claim 1, characterized in that: The outer locking sleeve includes a front part, a rear part, and a counterweight part located between the front part and the rear part. The first hole section, the second hole section, and the tapered transition section are all located at the rear part of the outer locking sleeve. The first spring is located between the front part of the outer locking sleeve and the front part of the inner hole of the pen barrel.

3. The pen with automatic retractable refill function according to claim 2, characterized in that: The front end of the outer locking sleeve includes a plug-in portion and an annular flange disposed behind the plug-in portion. The rear end of the first spring is plugged into the outer side of the plug-in portion and forms an abutting fit with the front end of the annular flange. The front part of the inner hole of the pen barrel is provided with an annular stepped surface, and the front end of the first spring abuts against the annular stepped surface.

4. The pen with automatic retractable refill function according to claim 2, characterized in that: The outer locking sleeve has a plug-in portion at the rear end of the front part and a plug-in portion at the front end of the front part and a ring flange at the rear end of the rear part. The counterweight is a cylindrical structure with an inner hole for accommodating and moving the pen refill. The front and rear ends of the counterweight are plugged into and fixedly engaged with the plug-in portions at the rear end of the front part and the front end of the rear part of the outer locking sleeve, respectively. The front and rear ends of the counterweight are also limited by the ring flanges at the front and rear of the outer locking sleeve, respectively.

5. The pen with automatic retractable refill function according to claim 4, characterized in that: The counterweight is made of tightly wound metal wire in a spiral shape.

6. The pen with automatic retractable refill function according to claim 5, characterized in that: The pen barrel is made of transparent material, at least in the portion corresponding to the counterweight.

7. The pen with automatic retractable refill function according to claim 1, characterized in that: The locking rod and the pen refill are connected by a pen refill support. The front end of the pen refill support is provided with a plug-in post and a retaining ring located behind the plug-in post. The plug-in post and the rear end of the pen refill ink tube are engaged and positioned. The retaining ring and the rear end of the pen refill ink tube are engaged and limited. There is a gap between the plug-in post, the retaining ring and the pen refill ink tube of the pen refill support.

8. The pen with automatic retractable refill function according to claim 7, characterized in that: The rear end of the pen refill support and the front end of the locking rod are connected in a plug-in fixed fit.

9. The pen with automatic retractable refill function according to claim 1, characterized in that: The rear end of the locking rod is provided with a limiting block, which forms a limiting fit with the rear end of the outer locking sleeve and the rear end of the inner locking sleeve. The through groove and the annular groove are in a relatively aligned state when the limiting block of the locking rod abuts against the rear end of the inner locking sleeve.

10. The pen with automatic retractable refill function according to claim 1, characterized in that: A second spring is provided between the pen refill and the pen barrel, and the second spring provides a backward elastic force to the pen refill.

Images