Extension device with self-locking function

Abstract

The invention discloses an extender with a self-locking function, and belongs to the technical field of extenders, the extender comprises a fixed shell, one end of the fixed shell is provided with a driving unit used for driving the extender to extend, and the inner side of the fixed shell is rotatably provided with an extending unit used for driving the extender to extend; and one side of the driving unit is provided with the locking unit used for locking the extender after the extender is extended, and a fixed wedge block in the locking unit can be in locking fit with the internal thread sleeve under the elastic force action of a first connecting spring, so that the internal thread sleeve is prevented from automatically rotating. Meanwhile, self-locking of the external thread sleeve and the connecting cylinder is further achieved through threaded connection of the internal thread sleeve and the external thread sleeve, and it is ensured that the extender can be stably kept at the needed position after being extended.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of extenders, in particular to an extender with self-locking function. BACKGROUND

[0002] In modern industrial production and daily life, extenders, as a common tool or component, are widely used in various scenarios. However, the existing extenders have many problems in actual use, especially in some specific application scenarios, their performance and function limitations are particularly prominent;

[0003] In the application scenario of medical devices, such as the extension operation of surgical instruments, the existing extenders also expose obvious defects. During the operation, the doctor needs to accurately control the operation of the surgical instrument, and the instability of the extender may cause the shaking or displacement of the surgical instrument, which seriously affects the accuracy and safety of the operation. Moreover, the operation of the complex extender increases the operation burden of the doctor, making the operation process more tedious and time-consuming;

[0004] Therefore, in view of the problems of insufficient stability, complex operation, unstable structure and the like of the existing extender in specific application scenarios, an extender with self-locking function is urgently needed to improve its performance and reliability in the use scenario of medical devices, so as to meet the high-precision and high-stability requirements of actual application. SUMMARY

[0005] The purpose of the present application is to provide an extender with self-locking function to solve the problems mentioned in the background art. To achieve the above purpose, the present application provides the following technical solution: a fixed shell is provided, one end of the fixed shell is provided with a driving unit for driving the extender to extend, the inner side of the fixed shell is rotatably provided with an extension unit for driving the extender to extend, and the side of the driving unit is provided with a locking unit for locking the extender after extension;

[0006] As a further preferred embodiment of the present technical solution: the driving unit comprises a driving rotating shaft, one end of the driving rotating shaft is connected with a driving rotating disc, one end of the driving rotating disc connected with the driving rotating shaft is connected with a driving toggle plate, and the driving unit further comprises a driving driven plate provided on the extension unit;

[0007] As a further preferred embodiment of the present technical solution: the extension unit comprises an internal thread sleeve, a first rotating ball is connected and arranged on the outer side of the internal thread sleeve, the extension unit further comprises an external thread sleeve rotatably arranged on the inner side of the fixed shell, an arc-shaped groove is arranged on the inner side of the external thread sleeve, one end of the arc-shaped groove is connected with a connecting barrel, and a limiting connection slide rod is arranged on the outer side of the connecting barrel;

[0008] As a further preferred of the technical solution: the lock unit includes a fixed connecting rod connected to the drive rotating disc side, the inner side of the fixed connecting rod is connected with the first connecting spring, and one end of the first connecting spring is connected with the fixed wedge block, the lock unit further includes a push sliding rod slidingly arranged on one side of the fixed shell, and the outer side of the push sliding rod is provided with a second connecting spring, and one end of the push sliding rod is connected with a connecting disc.

[0009] Compared with the prior art, the beneficial effects of the present application are:

[0010] 1、In the present application, the fixed wedge block in the lock unit can form a locking cooperation with the inner threaded sleeve under the elastic force of the first connecting spring, preventing the inner threaded sleeve from rotating automatically. At the same time, the threaded connection of the inner threaded sleeve and the outer threaded sleeve further realizes the self-locking of the outer threaded sleeve and the connecting cylinder, ensuring that the extender can be stably maintained at the required position after extension;

[0011] 2、In the present application, the pressing action of the push sliding rod can drive the fixed wedge block to slide on the fixed connecting rod, releasing the locking state of the inner threaded sleeve; and the rotation of the drive rotating disc can drive the inner threaded sleeve to rotate, realizing the extension or retraction operation of the outer threaded sleeve and the connecting cylinder. After extension to the required length, the push sliding rod can confirm the position of the fixed wedge block, and the locking is realized through the elastic force of the first connecting spring. This simplified operation process design not only improves the operation efficiency, but also reduces the operation difficulty, making the extender more convenient and efficient in actual use;

[0012] 3、In the present application, the outer side of the inner threaded sleeve is provided with a first rotating ball, which rotates and slides in the arc-shaped groove, so that the inner threaded sleeve rotates stably on the inner side of the fixed shell. At the same time, the outer threaded sleeve and the connecting cylinder are limited in the inner side of the fixed shell and the inner threaded sleeve through the limiting connection sliding rod, preventing the outer threaded sleeve from rotating with the inner threaded sleeve. This structure design ensures the stability of the extender during extension, and improves the reliability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural diagram of the extender with self-locking function of the present application Figure One ;

[0014] Figure 2 is an overall structure explosion diagram of the extender with self-locking function of the present application

[0015] Figure 3 is a partial structure section view of the extender with self-locking function of the present application Figure One ;

[0016] Figure 4Partial structure section view of the extender with self-locking function Figure Two ;

[0017] Figure 5 Partial structure section view of the extender with self-locking function Figure Three ;

[0018] Figure 6 Partial structure section view of the extender with self-locking function Figure Four ;

[0019] Figure 7 Enlarged view of A of Figure 6 ;

[0020] Figure 8 Partial structure section view of the extender with self-locking function Figure Five .

[0021] In the figure: 1, fixed shell; 2, drive unit; 21, drive rotating shaft; 22, drive rotating disc; 23, drive push plate; 24, drive driven plate; 3, extension unit; 31, inner threaded sleeve; 32, first rotating ball; 33, arc-shaped groove; 34, outer threaded sleeve; 35, limiting connection sliding rod; 36, connecting barrel; 4, locking unit; 41, fixed connecting rod; 42, first connecting spring; 43, fixed wedge block; 44, push sliding rod; 45, second connecting spring; 46, connecting disc; 47, second rotating ball. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0023] EMBODIMENT

[0024] Please refer to Figures 1-8 , the present application provides an extender with self-locking function technical scheme: including fixed shell 1, one end of fixed shell 1 is provided with drive unit 2 for driving the extender to extend, and the inner side of fixed shell 1 is rotatably provided with extension unit 3 for driving the extender to extend, and one side of drive unit 2 is provided with locking unit 4 for locking the extender after extension.

[0025] In the embodiment, the driving unit 2 comprises a driving rotating shaft 21, one end of the driving rotating shaft 21 is connected with a driving rotating disc 22, one end of the driving rotating shaft 21 is connected with a driving push plate 23, the driving push plate 23 rotates and slides on the inner side of the inner threaded sleeve 31, the driving unit 2 further comprises a driving driven plate 24 arranged on the extension unit 3, the driving driven plate 24 is fixedly arranged on the inner side of the inner threaded sleeve 31, and the driving driven plate 24 slides in close contact with the driving push plate 23.

[0026] Specifically, the extension unit 3 comprises an inner threaded sleeve 31, and a first rotating ball 32 is connected and arranged on the outer side of the inner threaded sleeve 31, the first rotating ball 32 rotates and slides on the inner side of the arc-shaped groove 33, the extension unit 3 further comprises an outer threaded sleeve 34 rotatably arranged on the inner side of the fixed shell 1, the outer threaded sleeve 34 is threadedly connected on the inner side of the inner threaded sleeve 31, the inner side of the outer threaded sleeve 34 is provided with the arc-shaped groove 33, one end of the arc-shaped groove 33 is connected with a connecting barrel 36, and the outer side of the connecting barrel 36 is provided with a limiting connecting slide rod 35 which is slidingly connected on the fixed shell 1.

[0027] In the embodiment, the locking unit 4 comprises a fixed connecting rod 41 connected on one side of the driving rotating disc 22, the inner side of the fixed connecting rod 41 is connected with a first connecting spring 42, the two ends of the first connecting spring 42 are respectively fixedly connected with one side of a fixed wedge block 43 and the inner side of the fixed connecting rod 41, one end of the first connecting spring 42 is connected with the fixed wedge block 43, the locking unit 4 further comprises a pushing slide rod 44 slidingly arranged on one side of the fixed shell 1, the pushing slide rod 44 penetrates and slidingly connects on the fixed shell 1, the outer side of the pushing slide rod 44 is provided with a second connecting spring 45, the two ends of the second connecting spring 45 are respectively fixedly connected with the inner side of the fixed shell 1 and one side of a connecting disc 46, one end of the pushing slide rod 44 is connected with the connecting disc 46, and the connecting disc 46 slides in the inner side of the fixed shell 1.

[0028] As a preferred embodiment, the pushing slide rod 44, the second connecting spring 45 and the connecting disc 46 are provided with multiple groups and annular arrays on the side of the fixed shell 1 close to the driving unit 2.

[0029] In the embodiment, the second rotating ball rotates and slides on the inner side of the driving rotating disc 22, and the outer side of the driving rotating disc 22 is provided with a push groove matched with the driving push plate 23.

[0030] Specifically, the inner threaded sleeve 31 is connected with the outer threaded sleeve 34 through threads, the outer threaded sleeve 34 and the connecting barrel 36 are limited in the inner side of the fixed shell 1 and the inner threaded sleeve 31 through the limiting connecting slide rod 35, so as to prevent the outer threaded sleeve 34 from rotating with the inner threaded sleeve 31, and the limiting connecting slide rod 35 slides on the fixed shell 1 to realize the extension or retraction operation of the outer threaded sleeve 34 and the connecting barrel 36.

[0031] In this embodiment, the elastic force of the first connecting spring 42 is greater than that of the second connecting spring 45. When the fixed wedge block 43 moves to one side of the connecting disc 46, the fixed wedge block 43 pushes the connecting disc 46 under the action of the elastic force of the first connecting spring 42, and at the same time drives the push slide rod 44 to extend out from the inner side of the fixed shell 1 to confirm the position of the fixed wedge block 43. After the push slide rod 44 extends out, it can form a limiting fit with the fixed shell 1 to realize the position locking of the fixed wedge block 43.

[0032] It should be noted that when the fixed wedge block 43 slides on the inner side of the inner threaded sleeve 31, it can form a locking fit with the inner side of the inner threaded sleeve 31 to prevent the inner threaded sleeve 31 from rotating automatically. The threaded connection of the inner threaded sleeve 31 and the outer threaded sleeve 34 can realize the self-locking of the outer threaded sleeve 34 and the connecting cylinder 36. The self-locking function is realized by the locking fit of the fixed wedge block 43 and the inner threaded sleeve 31 and the threaded connection of the inner threaded sleeve 31 and the outer threaded sleeve 34, to ensure that the extender can be stably kept at the required position after extension.

[0033] Working principle or structural principle: first, the user holds the outer side of the fixed shell 1, presses the push slide rod 44, drives the connecting disc 46 to move downward, extrudes the fixed wedge block 43, drives the fixed wedge block 43 to slide downward on the fixed connecting rod 41, and extrudes the first connecting spring 42 at the same time. At this time, by pulling the driving rotating disc 22, the driving rotating shaft 21 is driven to move, and at the same time the driving push plate 23 and the driving driven plate 24 are driven to fit, and the fixed wedge block 43 slides out from the inner side of the inner threaded sleeve 31. Through the elastic force of the first connecting spring 42, the fixed wedge block 43 slides out from the inner side of the fixed connecting rod 41;

[0034] By rotating the driving rotating disc 22, the driving rotating shaft 21 is driven to rotate, and at the same time the driving driven plate 24 is driven to rotate. The inner threaded sleeve 31 is driven to rotate by the driving driven plate 24, and at the same time the first rotating ball is arranged to rotate and slide in the arc-shaped groove 33, so that the inner threaded sleeve 31 rotates stably on the inner side of the fixed shell 1. The inner threaded sleeve 31 rotates at the same time to drive the fixed connecting rod 41 to rotate, and at the same time the second rotating ball is arranged at one end of the fixed connecting rod 41 to rotate and slide in the inner side of the driving rotating disc 22.

[0035] Through the rotation of the inner threaded sleeve 31, the threads provided on the inner side of the inner threaded sleeve 31 are screwed with the threads on the outer side of the outer threaded sleeve 34, and at the same time, the outer threaded sleeve 34 and the connecting cylinder 36 are limited in the inner side of the fixed shell 1 and the inner threaded sleeve 31 by the limiting connection slide rod 35, so that the outer threaded sleeve 34 cannot rotate with the inner threaded sleeve 31. Through the screwing of the inner threaded sleeve 31 and the outer threaded sleeve 34, and the rotation of the inner threaded sleeve 31, the outer threaded sleeve 34 can be extended from the inner side of the inner threaded sleeve 31, so that the connecting cylinder 36 can be extended, and the limiting connection slide rod 35 can slide on the fixed shell 1;

[0036] When the extension reaches a sufficient length for use, stop rotating the driving rotating disc 22, push the driving rotating disc 22 to drive the sliding in the middle position of the inner side of the inner threaded sleeve 31, and at the same time, the driving push plate 23 and the driven plate 24 are separated, and the fixed connecting rod 41 is driven to slide in the inner side of the inner threaded sleeve 31. Through the extrusion of the fixed wedge block 43 on one side of the inner threaded sleeve 31, the fixed wedge block 43 is slidably attached to the inner side of the inner threaded sleeve 31 through the inclined surface on one side of the fixed wedge block 43, so that the fixed wedge block 43 moves to the inner side of the fixed connecting rod 41, and extrudes the first connecting spring 42. When the fixed wedge block 43 moves to one side of one of the connecting discs 46, the first connecting spring 42 has a greater elastic force than the second connecting spring 45, the fixed wedge block 43 pushes the connecting disc 46, and at the same time, the push slide rod 44 is extended from the inner side of the fixed shell 1, so that the position of the fixed wedge block 43 can be confirmed;

[0037] By sliding the fixed wedge block 43 into the inner side of the fixed shell 1, the inner threaded sleeve 31 can be locked to prevent the inner threaded sleeve 31 from rotating automatically, and at the same time, the outer threaded sleeve 34 and the connecting cylinder 36 can be self-locked through the screwing of the inner threaded sleeve 31 and the outer threaded sleeve 34.

[0038] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An extender with a self-locking function, characterized in that: The invention comprises a fixed housing (1), wherein one end of the fixed housing (1) is provided with a driving unit (2) for driving an extender to extend, and an extension unit (3) for driving the extender to extend is rotatably provided on the inner side of the fixed housing (1), and a locking unit (4) for locking the extender after extension is provided on one side of the driving unit (2).

2. The extender with self-locking function according to claim 1, characterized in that: The driving unit (2) includes a driving rotating shaft (21), one end of which is connected to a driving rotating disk (22), and one end of which is connected to a driving dial plate (23). The driving unit (2) further includes a driving driven plate (24) provided on the extension unit (3).

3. The extender with self-locking function according to claim 2, characterized in that: The extension unit (3) includes an internal threaded sleeve (31), and a first rotating ball is connected to the outer side of the internal threaded sleeve (31). The extension unit (3) also includes an external threaded sleeve (34) rotatably arranged on the inner side of the fixed shell (1), an arc-shaped groove (33) is provided on the inner side of the external threaded sleeve (34), and one end of the arc-shaped groove (33) is connected to a connecting tube (36), and a limited connecting slide rod (35) is provided on the outer side of the connecting tube (36).

4. The extender with self-locking function according to claim 3, characterized in that: The locking unit (4) includes a fixed connecting rod (41) connected to one side of the driving rotating disk (22), a first connecting spring (42) is connected to the inner side of the fixed connecting rod (41), and one end of the first connecting spring (42) is connected to a fixed wedge block (43), and the locking unit (4) also includes a push slide rod (44) slidably arranged on one side of the fixed housing (1), a second connecting spring (45) is arranged on the outer side of the push slide rod (44), and one end of the push slide rod (44) is connected to the connecting disk (46).

Images