Multi-stage telescopic device

Abstract

The utility model discloses a multi-stage telescopic device which comprises a telescopic rod body which comprises a driven rod and a driving rod nested at the inner tail end of the driven rod, and the driven rod comprises a plurality of rod bodies which are sequentially nested and connected; the driving assembly is located in the telescopic rod body and comprises a motor, a lead screw connected with the motor and a sliding part which is connected to the lead screw in a sleeving mode and can move along the lead screw, and the sliding part is connected with the driving rod so as to drive the driving rod to stretch out and draw back when the motor works; and the transmission assembly is located in the telescopic rod body and comprises at least one transmission piece, and each rod body is in transmission connection with the driving rod through the at least one transmission piece and is in transmission connection with the rod body nested outside the driving rod through the transmission piece so as to extend outwards or retract inwards along with the driving rod when the driving rod stretches out and draws back. According to the multi-stage telescopic device, the driving assembly, the transmission assembly and the telescopic rod body are matched, the total telescopic length of the multi-stage telescopic device is increased in a driving and driven combined mode, and the telescopic ratio is increased.

Description

Technical Field

[0001] This utility model relates to the field of telescopic structure technology, and in particular to a multi-stage telescopic device. Background Technology

[0002] Existing cylindrical telescopic structures, such as selfie sticks and fishing rods, have a large telescopic ratio when not powered, but a smaller ratio when powered (i.e., after adding a power source), because the inner wall of the cylinder needs to accommodate the battery and power drive device. Currently, cylindrical electric telescopic devices typically use a lead screw as the power source. The telescopic rod usually employs a structure of two nested rods connected together, with the telescopic distance equal to the effective length of the lead screw. However, the effective length of the lead screw is affected by the size of the drive motor and power supply. Therefore, the length of the secondary rod used for telescopic extension is always less than that of the primary rod, and the telescopic ratio is mostly only around 0.7, always less than 1, which cannot meet the increasingly higher demands for usability and portability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a multi-stage telescopic device that can improve the telescopic ratio.

[0004] To solve the above-mentioned technical problems, this utility model provides a multi-stage telescopic device, comprising:

[0005] A telescopic rod includes a driven rod and an active rod nested within the end of the driven rod, wherein the driven rod includes multiple rod bodies that are nested together in sequence;

[0006] The drive assembly, located within the retractable rod, includes a motor, a lead screw connected to the motor, and a sliding member sleeved on the lead screw and movable along the lead screw. The sliding member is connected to the drive rod to drive the drive rod to extend or retract when the motor is working.

[0007] The transmission assembly, located within the retractable rod body, includes at least one transmission member. Each rod body is driven to the active rod via the at least one transmission member, and is also driven to a rod body nested outside it via the transmission member, so as to extend outward or retract inward along with the active rod during extension and retraction.

[0008] The further technical solution is as follows: the transmission component includes a pulley and a transmission belt. The pulley is disposed on one of the rods. One end of the transmission belt is connected to another rod nested outside the rod, and the other end is connected to the drive rod after passing around the pulley.

[0009] The further technical solution is as follows: the driven rod includes two rod bodies, a first rod body and a second rod body, which are nested together in sequence. The driving rod is nested inside the second rod body. The transmission component is located on the second rod body, with one end connected to the driving rod and the other end connected to the first rod body.

[0010] The further technical solution is as follows: the number of transmission components is two, the two transmission components are respectively fixed to the upper and lower ends of the second rod, and one end of the two transmission components is respectively connected to both sides of the lower end of the active rod, and the other end is respectively connected to the lower end and the upper end of the first rod.

[0011] The further technical solution is as follows: the number of transmission components is one, the transmission component is fixed to the upper end of the second rod body, and one end of the transmission component is connected to the lower end of the active rod, and the other end is connected to the lower end of the first rod body.

[0012] The further technical solution is as follows: the number of transmission components is one, the transmission component is fixed to the lower end of the second rod body, and one end of the transmission component is connected to the end of the active rod near the first rod body, and the other end is connected to the upper end of the first rod body.

[0013] The further technical solution is as follows: the driven rod includes three rod bodies in total, namely a first rod body, a second rod body, and a third rod body, which are nested together in sequence. The driving rod is nested inside the third rod body. There are two transmission components. One transmission component is located at the upper / lower end of the third rod body, with one end connected to the lower end of the driving rod and the other end connected to the lower / upper end of the second rod body. The other transmission component is located at the upper / lower end of the second rod body, with one end connected to the lower end of the driving rod and the other end connected to the lower / upper end of the first rod body.

[0014] The further technical solution is as follows: the driven rod includes three rod bodies in sequence: a first rod body, a second rod body, and a third rod body. The driving rod is nested inside the third rod body. The number of transmission components is four. Two of the four transmission components are fixed to the upper and lower ends of the third rod body, respectively. One end of each of the two transmission components is connected to both sides of the lower end of the driving rod, and the other end is connected to the lower and upper ends of the second rod body, respectively. The other two of the four transmission components are fixed to the upper and lower ends of the second rod body, respectively. One end of each of the two transmission components is connected to both sides of the lower end of the driving rod, and the other end is connected to the lower and upper ends of the first rod body, respectively.

[0015] The further technical solution is that the transmission belt is a steel wire rope.

[0016] To solve the above-mentioned technical problems, this utility model also provides a multi-stage telescopic device, comprising:

[0017] A telescopic rod includes a driven rod and a driving rod. The driven rod includes a first rod body, a second rod body, and a third rod body that are nested together. The driving rod is nested within the third rod body.

[0018] The drive assembly, located within the retractable rod, includes a motor, a lead screw connected to the motor, and a sliding member sleeved on the lead screw and movable along the lead screw. The sliding member is connected to the drive rod to drive the drive rod to extend or retract when the motor is working.

[0019] The transmission assembly, located within the retractable rod body, includes multiple transmission components. The third rod body is connected to the active rod via at least one of the transmission components, and is also connected to the second rod body via the transmission components. At least one transmission component is fixed to the second rod body, which is also connected to the first and third rod bodies, so as to extend outward or retract inward along with the active rod when it extends or retracts.

[0020] The beneficial technical effects of this utility model are as follows: Compared with the prior art, the driven rod of the telescopic rod in the multi-stage telescopic device of this utility model includes multiple rod bodies that are nested together in sequence, and the end of the driven rod is also connected to the driving rod. The driving rod can be extended and retracted through the cooperation of a lead screw, a motor, and a sliding member. At the same time, a transmission assembly is also provided. Each rod body is driven to the driving rod through a transmission member, and is also driven to the rod body nested outside it through the transmission member. So that when the driving rod extends outward, another rod body nested outside one rod body and driven to that rod body is connected to the driving rod. The moving rods move in opposite directions to allow the telescopic rod to extend quickly. The total extension length of the multi-stage telescopic device is the total telescopic length of the multiple rods and the active rod. During the inward retraction of the active rod, another rod nested outside one rod and connected to it in a transmission manner moves towards the active rod, allowing the telescopic rod to retract quickly. Thus, in this multi-stage telescopic device, the drive assembly, transmission assembly, and telescopic rod work together in an active-driven and driven manner to increase the total telescopic length of the multi-stage telescopic device, improve the telescopic ratio, and make it more portable. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the first embodiment of the multi-stage telescopic device of this utility model.

[0022] Figure 2 This is a cross-sectional schematic diagram of the first embodiment of the multi-stage telescopic device of this utility model.

[0023] Figure 3 This is a partial structural schematic diagram of the first embodiment of the multi-stage telescopic device of this utility model.

[0024] Figure 4 This is a partial structural schematic diagram of the second embodiment of the multi-stage telescopic device of this utility model.

[0025] Figure 5 This is a cross-sectional schematic diagram of the third embodiment of the multi-stage telescopic device of this utility model.

[0026] Figure 6 This is a partial structural schematic diagram of the third embodiment of the multi-stage telescopic device of this utility model. Detailed Implementation

[0027] To better understand the technical content of this utility model, the technical solution of this utility model will be further introduced and explained below with reference to the schematic diagram, but it is not limited thereto.

[0028] Reference Figures 1 to 3 , Figures 1 to 3 This paper presents a first embodiment of the multi-stage telescopic device 100 of this utility model. The multi-stage telescopic device 100 includes a telescopic rod 10, a drive assembly and a transmission assembly 30 located within the telescopic rod 10. The telescopic rod 10 includes a driven rod 11 and a driving rod 12 nested within the end of the driven rod 11. The driven rod 11 includes multiple (two or more) rod bodies connected in a sequential nested manner. The drive assembly includes a motor 21, a lead screw 22 connected to the motor 21, and a sliding member 23 sleeved on the lead screw 22 and movable along the lead screw 22. The sliding member 23 is connected to the active rod 12 to drive the active rod 12 to extend and retract when the motor 21 is working. Preferably, the sliding member 23 can be a lead screw nut, and it can be tightly fitted with the inner wall of the active rod 12. The transmission assembly 30 includes at least one transmission member 31. Each rod body is connected to the active rod 12 through at least one transmission member 31, and is also connected to a rod body nested outside it through the transmission member 31, so that it extends outward or retracts inward when the active rod 12 extends and retracts. Based on the above design, the multi-stage telescopic device 100 of this utility model increases its total telescopic length and improves the telescopic ratio by actively combining with driven components. Specifically, the active rod 12 can be telescopically extended and retracted through the cooperation of the lead screw 22, the motor 21, and the sliding member 23. At the same time, each of the rods is connected to the active rod 12 through the transmission member 31, and is also connected to the rods nested outside the active rod through the transmission member 31. So that when the active rod 12 extends outward, another rod nested outside the active rod and connected to it moves away from the active rod 12 in the opposite direction to quickly extend outward. The total extension length of the multi-stage telescopic device 100 is the total telescopic length of multiple rods and the active rod 12. When the active rod 12 retracts inward, another rod nested outside the active rod and connected to it moves towards the active rod 12 to quickly retract inward.

[0029] In this embodiment, the transmission component 31 includes a pulley 311 and a transmission belt 312. The pulley 311 is disposed on one of the rods, and one end of the transmission belt 312 is connected to another rod nested outside the rod, while the other end is connected to the drive rod 12 after wrapping around the pulley 311. Understandably, the transmission belt 312 can be a steel wire rope, etc., and the pulley 311 can be disposed at the end of the rod or on the outer wall of the rod (e.g., on the upper part of the outer wall of the rod), depending on actual needs. In this embodiment, force is transmitted through the cooperation of the pulley 311 and the steel wire rope, occupying a small space and facilitating installation in a limited space.

[0030] In this utility model, different numbers of rods and transmission components 31 can be set according to user needs. Preferably, such as... Figure 2 and Figure 3 As shown, in this embodiment, the driven rod 11 includes two rod bodies, a first rod body 111 and a second rod body 112, which are nested together in sequence. The driving rod 12 is nested inside the second rod body 112. There are two transmission components 31. The pulleys 311 in the two transmission components 31 are fixed to the upper and lower ends of the second rod body 112 respectively. One end of the transmission belt 312 in the two transmission components 31 is connected to both sides of the lower end of the driving rod 12 (i.e., the lower end of the driving rod 12), and the other end is connected to the lower end and the upper end of the first rod body 111 respectively. Based on this design, when the active rod 12 extends outward under the action of the drive assembly, the active rod 12 moves upward relative to the second rod body 112. Under the action of the transmission belt 312, the first rod body 111 moves downward relative to the second rod body 112. That is, the active rod 12 and the first rod body 111 move away from each other in opposite directions, completing the extension action. When the active rod 12 extends inward under the action of the drive assembly, the active rod 12 moves downward relative to the second rod body 112. Under the action of the transmission belt 312, the first rod body 111 moves upward relative to the second rod body 112. That is, the active rod 12 and the first rod body 111 move towards each other, completing the retraction action.

[0031] Understandably, in some other embodiments, the number of transmission components 31 may also be one. The pulley 311 in the transmission component 31 is fixed to the upper / lower end of the second rod body 112, and one end of the transmission belt 312 in the transmission component 31 is connected to the lower end of the active rod 12, and the other end is connected to the lower / upper end of the first rod body 111. In this embodiment, the transmission belt 312 can also achieve the following: during the outward extension of the active rod 12, the active rod 12 moves upward relative to the second rod body 112, and the first rod body 111 moves downward relative to the second rod body 112; during the inward retraction of the active rod 12, the active rod 12 moves downward relative to the second rod body 112, and the first rod body 111 moves upward relative to the second rod body 112. This also increases the total telescopic length and improves the telescopic ratio.

[0032] In this embodiment, the multi-stage telescopic device 100 is a two-stage telescopic structure. During use, the motor 21 can be controlled to rotate, driving the lead screw 22 to rotate, causing the lead screw nut to move upwards on the lead screw 22. This, in turn, drives the active rod 12 to move upwards. The active rod 12 moves upwards relative to the second rod body 112. Due to the force transmission effect of the transmission belt 312 in the transmission component 31, the upward movement of the active rod 12 will drive the first rod body 111 to move downwards relative to the second rod body 112, completing the extension action. Since the movement of the first rod body 111 relative to the second rod body 112 is a driven motion, in this embodiment, the outward extension stroke of the first rod body 111 is the same as the extension stroke of the active rod 12, thus the total extension length... The telescopic length is twice that of a traditional single-stage telescopic structure, with a telescopic ratio greater than 1. When retracting, the motor 21 can be reversed to rotate the lead screw 22, causing the lead screw nut to move downward on the lead screw 22, thereby driving the active rod 12 to move downward. The active rod 12 moves downward relative to the second rod body 112. Due to the force transmission effect of the transmission belt 312 in the transmission component 31, the downward movement of the active rod 12 will drive the first rod body 111 to move upward relative to the second rod body 112, completing the retraction action. Therefore, compared with the traditional telescopic structure, although both use the lead screw 22 as the power source, this utility model, in conjunction with the transmission component 30, achieves an increase in the total telescopic length and improves the telescopic ratio.

[0033] Reference Figure 4 , Figure 4 This is a partial structural schematic diagram of a second embodiment of the multi-stage telescopic device 100 of this utility model. (In conjunction with...) Figure 1 and Figure 3 It can be seen that the difference between this embodiment and the first embodiment lies in the number of rods in the driven rod 11 of the telescopic rod 10 and the number of transmission components 31 in the transmission assembly 30. Figure 4(The specific connection between the transmission component 31 and the driven rod 11 is shown), and the rest of the structure is the same or similar. In this embodiment, the driven rod 11 includes three rod bodies: a first rod body 111, a second rod body 112, and a third rod body 113, which are nested together in sequence. The driving rod 12 is nested inside the third rod body 113. There are four transmission components 31. The pulleys 311 of two of the four transmission components 31 are fixed to the upper and lower ends of the third rod body 113, respectively. One end of the transmission belt 312 of these two transmission components 31 is connected to both sides of the lower end of the driving rod 12, and the other end is connected to the lower and upper ends of the second rod body 112, respectively. The pulleys 311 of the other two of the four transmission components 31 are fixed to the upper and lower ends of the second rod body 112, respectively. One end of the transmission belt 312 of these two transmission components 31 is connected to both sides of the lower end of the driving rod 12, and the other end is connected to the lower and upper ends of the first rod body 111, respectively. As can be seen, the multi-stage telescopic device 100 in this embodiment is a three-stage telescopic structure. When the active rod 12 extends outward under the action of the driving component, the active rod 12 moves upward relative to the third rod body 113. Under the action of the transmission belt 312, the second rod body 112 moves downward relative to the third rod body 113, and the first rod body 111 also moves downward relative to the second rod body 112, completing the extension action. When the active rod 12 extends inward, the active rod 12 moves downward relative to the third rod body 113. Under the action of the transmission belt 312, the second rod body 112 moves upward relative to the third rod body 113, and the first rod body 111 also moves upward relative to the second rod body 112, completing the retraction action. This can also increase the total telescopic length and improve the telescopic ratio.

[0034] Understandably, in some other embodiments, in order to further reduce the space occupied by the transmission assembly 30, the number of transmission members 31 can also be set to two. One transmission member 31 has a pulley 311 disposed at the upper / lower end of the third rod body 113, and one end of the transmission belt 312 in the transmission member 31 is connected to the lower end of the drive rod 12, and the other end is connected to the lower / upper end of the second rod body 112; the other transmission member 31 has a pulley 311 disposed at the upper / lower end of the second rod body 112, and one end of the transmission belt 312 in the transmission member 31 is connected to the lower end of the drive rod 12, and the other end is connected to the lower / upper end of the first rod body 111.

[0035] Reference Figures 5 to 6 , Figures 5 to 6This paper presents a third embodiment of the multi-stage telescopic device 100 of this utility model. The difference between this embodiment and the second embodiment lies in the connection between the transmission member 31 and the rod body in the driven rod 11; the rest of the structure is the same or similar. In this embodiment, the driven rod 11 includes three rod bodies: a first rod body 111, a second rod body 112, and a third rod body 113, which are nested together in sequence. The driving rod 12 is nested within the third rod body 113. There are four transmission components 31. The pulleys 311 of two of the four transmission components 31 are fixed to the upper and lower ends of the third rod body 113, respectively. One end of the transmission belt 312 of these two transmission components 31 is connected to both sides of the lower end of the driving rod 12, and the other end is connected to the lower and upper ends of the second rod body 112, respectively. The pulleys 311 of the other two of the four transmission components 31 are fixed to the upper and lower ends of the second rod body 112, respectively. One end of the transmission belt 312 of these two transmission components 31 is connected to both sides of the lower end of the third rod body 113, and the other end is connected to the lower and upper ends of the first rod body 111, respectively. As can be seen, the difference between this embodiment and the second embodiment is that in this embodiment, the transmission belt 312 of the two transmission components 31 fixed on the second rod 112 is connected to the lower end of the third rod 113. When the active rod 12 extends outward under the action of the driving component, the active rod 12 moves upward relative to the third rod 113. Under the action of the transmission belt 312, the second rod 112 moves downward relative to the third rod 113. The first rod 111 also moves downward relative to the second rod 112 under the action of the transmission component 31, completing the extension action. When the active rod 12 extends inward, the active rod 12 moves downward relative to the third rod 113. Under the action of the transmission belt 312, the second rod 112 moves upward relative to the third rod 113. The first rod 111 also moves upward relative to the second rod 112, completing the retraction action. This can also increase the total telescopic length and improve the telescopic ratio.

[0036] In summary, the drive assembly, transmission assembly, and telescopic rod of this utility model work together to increase the total extension of the multi-stage telescopic device during the outward extension of the drive rod, thereby increasing the total telescopic length and improving the telescopic ratio. Furthermore, the transmission components consist of pulleys and a transmission belt, which occupy less space and do not affect the overall product volume, making it more portable.

[0037] The above preferred embodiments should be regarded as illustrative examples of the implementation of the present utility model. Any technical deductions, substitutions, improvements, etc. that are similar to or based on the present utility model should be considered within the scope of protection of this patent.

Claims

1. A multi-stage telescopic device, characterized in that, The multi-stage telescopic device includes: A telescopic rod includes a driven rod and an active rod nested within the end of the driven rod, wherein the driven rod includes multiple rod bodies that are nested together in sequence; The drive assembly, located within the retractable rod, includes a motor, a lead screw connected to the motor, and a sliding member sleeved on the lead screw and movable along the lead screw. The sliding member is connected to the drive rod to drive the drive rod to extend or retract when the motor is working. The transmission assembly, located within the retractable rod body, includes at least one transmission member. Each rod body is driven to the active rod via the at least one transmission member, and is also driven to a rod body nested outside it via the transmission member, so as to extend outward or retract inward along with the active rod during extension and retraction.

2. The multi-stage telescopic device as described in claim 1, characterized in that, The transmission component includes a pulley and a transmission belt. The pulley is disposed on one of the rods. One end of the transmission belt is connected to another rod nested outside the rod, and the other end is connected to the drive rod after passing around the pulley.

3. The multi-stage telescopic device as described in claim 1 or 2, characterized in that, The driven rod includes two rod bodies, a first rod body and a second rod body, which are nested together in sequence. The driving rod is nested inside the second rod body. The transmission component is located on the second rod body, with one end connected to the driving rod and the other end connected to the first rod body.

4. The multi-stage telescopic device as described in claim 3, characterized in that, The number of transmission components is two. The two transmission components are respectively fixed to the upper and lower ends of the second rod body, and one end of the two transmission components is respectively connected to both sides of the lower end of the active rod, and the other end is respectively connected to the lower end and the upper end of the first rod body.

5. The multi-stage telescopic device as described in claim 3, characterized in that, The number of transmission components is one. The transmission component is fixed to the upper end of the second rod body, and one end of the transmission component is connected to the lower end of the driving rod, and the other end is connected to the lower end of the first rod body.

6. The multi-stage telescopic device as described in claim 3, characterized in that, The number of transmission components is one. The transmission component is fixed to the lower end of the second rod body, and one end of the transmission component is connected to the end of the active rod near the first rod body, and the other end is connected to the upper end of the first rod body.

7. The multi-stage telescopic device as described in claim 1 or 2, characterized in that, The driven rod includes three rods: a first rod body, a second rod body, and a third rod body, which are nested together in sequence. The driving rod is nested inside the third rod body. There are two transmission components: one transmission component is located at the upper / lower end of the third rod body, with one end connected to the lower end of the driving rod and the other end connected to the lower / upper end of the second rod body; the other transmission component is located at the upper / lower end of the second rod body, with one end connected to the lower end of the driving rod and the other end connected to the lower / upper end of the first rod body.

8. The multi-stage telescopic device as described in claim 1 or 2, characterized in that, The driven rod includes three rod bodies: a first rod body, a second rod body, and a third rod body, which are nested together in sequence. The driving rod is nested inside the third rod body. There are four transmission components. Two of the four transmission components are fixed to the upper and lower ends of the third rod body, respectively. One end of each of the two transmission components is connected to both sides of the lower end of the driving rod, and the other end is connected to the lower and upper ends of the second rod body, respectively. The other two of the four transmission components are fixed to the upper and lower ends of the second rod body, respectively. One end of each of the two transmission components is connected to both sides of the lower end of the driving rod, and the other end is connected to the lower and upper ends of the first rod body, respectively.

9. The multi-stage telescopic device as described in claim 2, characterized in that, The transmission belt is a steel wire rope.

10. A multi-stage telescopic device, characterized in that, The multi-stage telescopic device includes: A telescopic rod includes a driven rod and a driving rod. The driven rod includes a first rod body, a second rod body, and a third rod body that are nested together. The driving rod is nested within the third rod body. The drive assembly, located within the retractable rod, includes a motor, a lead screw connected to the motor, and a sliding member sleeved on the lead screw and movable along the lead screw. The sliding member is connected to the drive rod to drive the drive rod to extend or retract when the motor is working. The transmission assembly, located within the retractable rod body, includes multiple transmission components. The third rod body is connected to the active rod via at least one of the transmission components, and is also connected to the second rod body via the transmission components. At least one transmission component is fixed to the second rod body, which is also connected to the first and third rod bodies, so as to extend outward or retract inward along with the active rod when it extends or retracts.

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