A self-locking support mechanism

Abstract

The present invention discloses a self-locking support mechanism, comprising a fixed seat, a telescopic member, a boss, a latch tongue and a limit member. The fixed seat is provided with a slide groove along its length direction, the telescopic member is arranged in the slide groove and slidably cooperates with the fixed seat, the latch tongue can be lifted and lowered and rotatably arranged on the telescopic member, the limit member is arranged on the latch tongue, and the boss is arranged in the slide groove. It comprises a self-locking part located at its front end, a starting part located at its rear end, and a clamping part located between the starting part and the self-locking part. When the self-locking support mechanism is in an adjustment state, the latch tongue is clamped with the clamping groove, and the limit surface can limit the latch tongue from moving backwards, thereby providing support for the telescopic member; when the self-locking support mechanism is in a self-locking state, the latch tongue can move backwards and directly pass over the clamping part, thereby making the telescopic member retreat to its original position, and the latch tongue enters the clamping groove again; the self-locking support mechanism switches from the self-locking state to the adjustment state, and repeats this cycle, and the user only needs to push and pull by hand without switch control.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a self-locking support mechanism. Background Art

[0002] In modern life, in order to meet people's diverse usage needs, manufacturers continue to develop various adjustable furniture, and these adjustable furniture inevitably use adjustable support mechanisms to realize the movement of movable parts of the furniture; including telescopic support mechanisms with linear adjustment strokes and rotating support mechanisms with angle adjustment strokes, but for most of the telescopic support mechanisms currently on the market, their operation needs to be controlled by switches.

[0003] The most common and simple telescopic support mechanisms on furniture are gas rods and electric push rods. Electric push rods need to be powered on to use, so they have certain limitations and are often not suitable for daily office and study chairs. Both gas rods and electric push rods require switches for adjustment and control. Too many switches not only seriously affect the appearance of the chair, but also make the operation of adjusting the furniture more complicated, affecting the user experience. Various problems will also be encountered when using switches. For example, users are prone to misoperation when they are not familiar with multiple switches. After the switches have been used for a long time, the intact gas rods and electric push rods cannot work due to damage. The layout and location of each switch must be considered in the design.

[0004] Therefore, a modular telescopic support mechanism that can be self-locked and unlocked without a switch can solve various problems caused by the switch. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a self-locking support mechanism, in which a fixed seat and a telescopic part are used to connect parts of furniture, so that the furniture parts connected to the telescopic part become movable parts; when the self-locking support mechanism is in an adjustment state, the latch tongue is engaged with the slot, and the limiting surface can limit the latch tongue from moving backward, thereby providing support for the telescopic part; when the self-locking support mechanism is in a self-locking state, the latch tongue can move backward directly over the engaging portion, thereby causing the telescopic part to return to its original position, and the latch tongue enters the slot again.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A self-locking support mechanism, comprising:

[0008] The fixed seat has a slide groove along its length direction;

[0009] A telescopic member, arranged in the slide groove and slidably matched with the fixed seat;

[0010] The boss is arranged in the slide groove along the length direction of the slide groove; the boss includes a self-locking part located at the front end thereof, a starting part located at the rear end thereof, and a clamping part located between the starting part and the self-locking part; the clamping part includes a plurality of clamping grooves arranged along the length direction of the slide groove, the clamping groove has a vertical limiting surface and an inclined sliding surface, the limiting surface is located at the rear side of the clamping groove, and the sliding surface is located at the front side of the clamping groove; the starting part includes a return surface facing forward; the self-locking part includes a rising inclined surface, a stopping surface and a rotating sliding surface, the rising inclined surface is located behind the stopping surface and the rotating sliding surface, the rotating sliding surface is arranged horizontally, the stopping surface is located beside the rotating sliding surface and the stopping surface is an upwardly inclined inclined surface;

[0011] The latch tongue is arranged toward the boss and is slidably arranged on the telescopic member along the width direction of the telescopic member, and the latch tongue is rotatably matched with the telescopic member; when the latch tongue enters the slot, the latch tongue is engaged with the slot, and the latch tongue is limited by the limiting surface and supports the telescopic member with a tendency to move backward to stay at the current position; when the telescopic member slides forward in the slide groove, the latch tongue slides on the sliding surface and enters the next slot;

[0012] A limiting member, which is arranged on the telescopic member and fixedly connected to the latch tongue; the limiting member is configured to limit the latch tongue to a current state (height and angle) when the latch tongue rotates;

[0013] The self-locking support mechanism has an adjustment state and a self-locking state; in the adjustment state, the latch tongue is located at the latching portion and is latched with the latch slot, and the telescopic member can slide forward, and the latch tongue switches between the latch slots accordingly; in the adjustment state, when the telescopic member has a tendency to move backward, the limiting surface limits the latch tongue and supports the telescopic member to stay in the current position;

[0014] When switching from the adjustment state to the self-locking state, the latch tongue moves forward with the telescopic part, passes through the clamping part and enters the self-locking part from the rising inclined surface. When the latch tongue passes through the rising inclined surface and enters the rotating sliding surface, the stop surface blocks one of the left and right ends of the latch tongue, and the latch tongue slides and rotates on the rotating sliding surface. At this time, the limit member restricts the latch tongue to this state, and the self-locking support mechanism enters the self-locking state; in the self-locking state, the latch tongue can move backward and directly pass over the clamping part; after passing the clamping part, the latch tongue contacts the return surface of the starting part and rotates back, and the latch tongue enters the clamping groove of the clamping part again, and the self-locking support mechanism switches from the self-locking state back to the adjustment state.

[0015] In the adjustment state, the latch tongue can move forward in the locking portion and switch between the slots, so that the telescopic part can extend unimpeded, and when the latch tongue is engaged with the slot, the limit surface restricts the latch tongue from moving backward, thereby providing support for the telescopic part; the latch tongue continues to move forward in the self-locking portion to make the self-locking support mechanism enter the self-locking state, and the latch tongue in the self-locking state is locked at the current height and rotation angle due to the limit member, and the height of the latch tongue at this time allows the latch tongue to directly pass the locking portion backward to the starting portion, and the telescopic part can also retreat to the starting position; after the latch tongue contacts the return surface of the starting portion, it continues to move backward, and the latch tongue will rotate in the opposite direction to that in the self-locking portion, so that the latch tongue returns to its position and re-enters the first slot of the locking portion, and the self-locking support mechanism switches from the self-locking state to the adjustment state, and this cycle is repeated, and the user only needs to push and pull by hand, without the need for switch control.

[0016] Preferably, a rotating shaft is protruded upward from the latch tongue, and correspondingly, an axial hole is provided on the telescopic member, and the rotating shaft is inserted into the axial hole of the telescopic member and rotatably cooperates with the telescopic member.

[0017] Preferably, the lower end of the rotating shaft is provided with a sliding boss protruding from the rotating shaft in the radial direction of the rotating shaft, and the telescopic member is provided with a sliding guide groove correspondingly below the shaft hole, and the sliding boss is inserted into the sliding guide groove and slides with the sliding guide groove. The rotating shaft and the shaft hole are used for the rotation of the tongue, and the sliding boss and the sliding guide groove are used for the sliding of the tongue. The two are relatively independent but interconnected, and are not easy to interfere with each other, and can be carried out simultaneously when needed.

[0018] Preferably, a spring is sleeved on the rotating shaft above the sliding boss. The spring is located in the sliding guide groove, and its two ends respectively abut against the top surface of the sliding guide groove and the sliding boss. The spring acts on the sliding boss and gives the elastic force downward to the latch tongue to be inserted into the slot. The spring makes the latch tongue always have a downward force in the adjustment state. When the latch tongue passes the sliding surface and comes to the next slot, the spring can immediately press the latch tongue into the slot.

[0019] Preferably, the upper end of the rotating shaft has a positioning surface, and the limiting member has a corresponding insertion hole. The upper end of the rotating shaft is inserted into the insertion hole and the limiting member and the rotating shaft are locked by a screw; the positioning surface is configured to make the rotating shaft and the limiting member rotate synchronously. This solution enables the limiting member and the tongue to rotate synchronously, so that the limiting member can act on the tongue after rotation, so that the tongue maintains the rotated state through the cooperation between the limiting member and the telescopic member.

[0020] Preferably, the limiting member includes a disc-shaped main body and a lifting platform protruding downward from the main body. Correspondingly, a accommodating cavity is opened on the telescopic member, and the limiting member is arranged in the accommodating cavity; the accommodating cavity includes a circular groove for accommodating the main body and a sunken groove for accommodating the lifting platform, and the sunken groove is located below the circular groove; in the adjustment state, the lifting platform is located in the sunken groove; when switching from the adjustment state to the self-locking state, the lifting platform rises from the sunken groove and then rotates to enter the circular groove; in the self-locking state, the lifting platform is located in the circular groove and the lifting platform rests against the bottom surface of the circular groove. The limiting member is located in the accommodating cavity. In order to match the shape of the limiting member, the accommodating cavity includes a circular groove and a sunken groove. When the latch moves on the sliding surface, the lifting platform will also be lifted in the sunken groove, but will not exceed the sunken groove to enter the circular groove. Only when the latch moves on the ascending inclined surface, the lifting platform will rise to the highest point and be able to enter the circular groove from the sunken groove, but the limiting member still needs to rotate to abut against the bottom surface of the circular groove, that is, the latch drives the limiting member to rotate together under the action of the stopping surface and the rotating sliding surface.

[0021] Preferably, an inclined rotating surface is provided between the circular groove and the sinking groove, so that when the stopper rotates, it is convenient for the lifting platform to enter the circular groove from the sinking groove.

[0022] Preferably, the main body is also provided with a rotation limiting portion which protrudes radially from the main body, and correspondingly, a rotation limiting groove is opened on the telescopic member beside the circular groove, and the rotation limiting groove is arranged along the circumference of the circular groove; the rotation limiting portion is arranged in the rotation limiting groove and rotates in the rotation limiting groove as the limiting member rotates.

[0023] Preferably, the left and right end faces of the rotation limit slot have an angle of 40°-50°. This preferred solution can prevent the latch from rotating excessively in the self-locking state and being unable to re-enter the latch slot.

[0024] Preferably, the fixing seat comprises a box body and a cover plate, the slide groove is provided on the box body, the telescopic member is arranged in the slide groove and is sealed by the cover plate.

[0025] The design starting point, concept and beneficial effects of the present invention using the above technical solution are:

[0026] In the adjustment state, the latch tongue can move forward in the locking portion and switch between the slots, so that the telescopic part can extend unimpeded, and when the latch tongue is engaged with the slot, the limit surface restricts the latch tongue from moving backward, thereby providing support for the telescopic part; the latch tongue continues to move forward in the self-locking portion to make the self-locking support mechanism enter the self-locking state, and the latch tongue in the self-locking state is locked at the current height and rotation angle due to the limit member, and the height of the latch tongue at this time allows the latch tongue to directly pass the locking portion backward to the starting portion, and the telescopic part can also retreat to the starting position; after the latch tongue contacts the return surface of the starting portion, it continues to move backward, and the latch tongue will rotate in the opposite direction to that in the self-locking portion, so that the latch tongue returns to its position and re-enters the first slot of the locking portion, and the self-locking support mechanism switches from the self-locking state to the adjustment state, and this cycle is repeated, and the user only needs to push and pull by hand, without the need for switch control. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the self-locking support mechanism in an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the box body in an embodiment of the present invention;

[0029] Figure 3 It is a side view of the box body in the embodiment of the present invention;

[0030] Figure 4 The three-dimensional structure diagram of the clamping tongue disposed on the telescopic member in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 5 The three-dimensional structure diagram of the clamping tongue disposed on the telescopic member in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 6 Schematic diagram of the three-dimensional structure of the telescopic member in the embodiment of the present invention Figure 1 ;

[0033] Figure 7 Schematic diagram of the three-dimensional structure of the telescopic member in the embodiment of the present invention Figure 2 ;

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the latch in the embodiment of the present invention;

[0035] Fig. 9 It is a schematic diagram of a three-dimensional structure in which a limiter and a spring are arranged on a rotating shaft in an embodiment of the present invention;

[0036] Fig.10 It is a schematic diagram of the three-dimensional structure of the limiting member in the embodiment of the present invention;

[0037] Fig.11An exploded view of the self-locking support mechanism in an embodiment of the present invention;

[0038] Fig.12 A cross-sectional view of a latch moving on an ascending inclined plane in an embodiment of the present invention;

[0039] Fig.13 A cross-sectional view of the latch tongue in the embodiment of the present invention rotating due to the stop surface and the rotating sliding surface;

[0040] Fig.14 A cross-sectional view of the latch returning to the starting portion in an embodiment of the present invention;

[0041] Fig.15 It is a cross-sectional view of the self-locking support mechanism in the embodiment of the present invention re-entering the adjustment state.

[0042] The reference numerals of the figures are as follows: fixed seat 1; box body 101; cover plate 102; telescopic member 2; boss 3; self-locking portion 31; starting portion 32; clamping portion 33; latch tongue 4; limiting member 5; main body 51; lifting platform 52; rotation limiting portion 53; slide groove 6; clamping groove 7; limiting surface 71; sliding surface 72; return surface 8; rising inclined surface 9; stopping surface 10; rotating sliding surface 11; avoidance groove 12; first convex strip 13; second convex strip 14; rotating shaft 15; shaft hole 16; sliding boss 17; sliding guide groove 18; spring 19; third convex strip 20; positioning surface 21; insertion hole 22; circular groove 23; sinking groove 24; rotating surface 25; rotation limiting groove 26. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] The specific implementation of the present invention is as follows:

[0047] like Figure 1 , 11As shown, the present invention provides a self-locking support mechanism, including a fixed seat 1, a telescopic member 2, a boss 3, a latch 4 and a limiting member 5. The fixed seat 1 is provided with a slide groove 6 along its length direction, and the telescopic member 2 is arranged in the slide groove 6 and slidably cooperates with the fixed seat 1; the boss 3 is arranged in the slide groove 6 along the length direction of the slide groove 6; the boss 3 includes a self-locking portion 31 located at its front end, a starting portion 32 located at its rear end, and a clamping portion 33 located between the starting portion 32 and the self-locking portion 31, the clamping portion 33 includes a plurality of clamping grooves 7 arranged along the length direction of the slide groove 6, the clamping groove 7 has a vertical limiting surface 71 and an inclined sliding surface 72, the limiting surface 71 is located at the rear side of the clamping groove 7, and the sliding surface 72 is located at the front side of the clamping groove 7; the starting portion 32 includes a return surface 8 facing forward; the self-locking portion 31 includes a rising inclined surface 9, a stop surface 10 and a rotating sliding surface Surface 11, the rising inclined surface 9 is located behind the stopping surface 10 and the rotating sliding surface 11, the rotating sliding surface 11 is horizontally arranged, the stopping surface 10 is located beside the rotating sliding surface 11 and the stopping surface 10 is an upwardly inclined inclined surface; the latch tongue 4 is arranged toward the boss 3 and is slidably arranged on the telescopic member 2 along the width direction of the telescopic member 2, and the latch tongue 4 is rotatably matched with the telescopic member 2; when the latch tongue 4 enters the slot 7, the latch tongue 4 is engaged with the slot 7, and the latch tongue 4 is limited by the limiting surface 71 and supports the telescopic member 2 with a tendency to move backward to stay in the current position; when the telescopic member 2 slides forward in the slide groove 6, the latch tongue 4 slides on the sliding surface 72 and enters the next slot 7; the limiting member 5 is arranged on the telescopic member 2 and is fixedly connected to the latch tongue 4; the limiting member 5 is configured to limit the latch tongue 4 to the current state, that is, the height and rotation angle of the latch tongue 4 at this time, when the latch tongue 4 rotates.

[0048] like Figure 12-15 As shown, the self-locking support mechanism has an adjustment state and a self-locking state; in the adjustment state, the latch tongue 4 is located at the engaging portion 33 and engaged with the engaging slot 7, at which time the telescopic member 2 can slide forward, and the latch tongue 4 switches between the engaging slots 7 accordingly; in the adjustment state, when the telescopic member 2 has a tendency to move backward, the limiting surface 71 limits the latch tongue 4 and supports the telescopic member 2 to stay in the current position; when switching from the adjustment state to the self-locking state, the latch tongue 4 moves forward with the telescopic member 2, passes through the engaging portion 33, and then enters the self-locking portion 31 from the rising inclined surface 9, and the latch tongue 4 passes through When the ascending inclined surface 9 enters the rotating sliding surface 11, the stopping surface 10 blocks one of the left and right ends of the latch tongue 4, and the latch tongue 4 slides and rotates on the rotating sliding surface 11. At this time, the limit member 5 restricts the latch tongue 4 to this state, and the self-locking support mechanism enters the self-locking state; in the self-locking state, the latch tongue 4 can move backward and directly pass over the locking portion 33; after the latch tongue 4 passes over the locking portion 33, it contacts the return surface 8 of the starting portion 32 and rotates back, and the latch tongue 4 enters the slot 7 of the locking portion 33 again, and the self-locking support mechanism switches from the self-locking state to the adjustment state.

[0049] Specifically, if Figure 1-3As shown in Figures 1 and 11, the fixing seat 1 includes a box body 101 and a cover plate 102, the slide groove 6 is opened on the box body 101, the telescopic member 2 is in the shape of a long strip, the telescopic member 2 is arranged in the slide groove 6 and is covered by the cover plate 102; according to the above structure, the telescopic member 2 can slide in the slide groove 6, and when the telescopic member 2 moves relative to the fixing member, the self-locking support mechanism presents a telescopic action; when the self-locking support mechanism is extended, the self-locking support mechanism is in an adjustment state, and from the internal structure point of view, the latch tongue 4 is located at the clamping portion 33 and moves forward to switch between different clamping grooves 7; when the self-locking support mechanism is shortened, the self-locking support mechanism is in a self-locking state, and from the internal structure point of view, the latch tongue 4 can directly pass over the clamping portion 33 backwards.

[0050] like Figure 4-7 As shown, the telescopic member 2 is provided with an avoidance groove 12 arranged along the length direction of the telescopic member 2, and the avoidance groove 12 is configured to avoid the boss 3; when the telescopic member 2 is inserted in the slide groove 6, the boss 3 also enters the avoidance groove 12, and when the rear end face of the telescopic member 2 abuts against the rear end groove wall of the slide groove 6, the front end face of the boss 3 also abuts against the front end groove wall of the avoidance groove 12; the latch tongue 4 is also located in the avoidance groove 12, so that the telescopic member 2 is moved on the clamping portion 33, the starting portion 32 and the self-locking portion 31. The first convex strip 13 and the second convex strip 13 are also provided on the telescopic member 2. Raised strips 14; there are three first raised strips 13, which are arranged in the front-to-back direction and are distributed at intervals up and down on the left side surface of the telescopic member 2; the second raised strips 14 are arranged in the left-to-right direction and are distributed at intervals up and down on the upper and lower surfaces of the telescopic member 2, and four second raised strips 14 are distributed on the upper surface of the telescopic member 2; due to the existence of the avoidance groove 12, there are only two second raised strips 14 on the lower surface of the telescopic member 2; the first raised strips 13 and the second raised strips 14 reduce the contact area between the telescopic member 2 and the groove wall of the slide groove 6, greatly reduce friction, and facilitate the smooth extension and retraction of the self-locking support mechanism.

[0051] In the boss 3, the height of the clamping portion 33 is lower than the height of the starting portion 32 and the self-locking portion 31, that is, the highest point of the limiting surface 71 is lower than the highest point of the return surface 8 and the rising inclined surface 9; the limiting surface 71 is located behind the slot 7 and faces straight ahead, and the sliding surface 72 is located in front of the slot 7 and is inclined, facing obliquely backward and upward; the return surface 8 and the limiting surface 71 are in the same direction, the rising inclined surface 9 and the sliding surface 72 are in the same direction, and the stop surface 10 is also facing obliquely backward and upward, and the rotating sliding surface 11 is horizontally arranged and faces upward; the rising inclined surface 9 is to raise the height of the latch 4, which can pass over the latch 33 after being higher than the height of the clamping portion 33, and the stop surface 10 and the rotating sliding surface 11 allow the latch 4 to rotate, thereby driving the limiting member 5 to rotate, and the limiting member 5 can keep the latch 4 at the current height after rotating, and will not rotate when the latch 4 does not hit the returning surface 8; the returning surface 8 can also limit the backward movement of the latch 4 when the latch 4 is in the first slot 7, thereby providing support for the telescopic member 2.

[0052] like Figure 8 , 9 As shown in 11, the latch 4 is a triangular prism, arranged along the left and right directions of the slide groove 6, and the latch 4 is provided with a columnar rotating shaft 15 protruding upward, and correspondingly, a circular axial hole 16 arranged in the vertical direction is provided on the telescopic member 2 above the avoidance groove 12, and the rotating shaft 15 is inserted in the axial hole 16 of the telescopic member 2 and rotatably cooperates with the telescopic member 2, so that the latch 4 can be rotatably arranged on the telescopic member 2; the lower end of the rotating shaft 15 is provided with a sliding boss 17 protruding from the rotating shaft 15 in the radial direction, and the telescopic member 2 is provided with a vertically arranged sliding guide groove 18 with a circular cross section below the axial hole 16, and the sliding boss 17 is inserted in the sliding guide groove 18 and slidably cooperates with the sliding guide groove 18, so that the latch 4 can be lifted and lowered on the telescopic member 2; the diameter of the sliding guide groove 18 is larger than the diameter of the axial hole 16, and the depth of the sliding guide groove 18 is large, so that the latch 4 has a sufficient lifting stroke; the rotating shaft 15 and the axial hole 16 are used for the rotation of the latch 4, and the sliding boss 17 and the sliding The guide groove 18 is used for the sliding of the latch tongue 4. The two are relatively independent and interconnected, and are not easy to interfere with each other. They can be carried out simultaneously when needed; a spring 19 is sleeved on the rotating shaft 15 above the sliding boss 17, and the spring 19 is located in the sliding guide groove 18, and its two ends respectively abut against the top surface of the sliding guide groove 18 and the sliding boss 17, and the spring 19 acts on the sliding boss 17 and gives the latch tongue 4 an elastic force to snap into the slot 7 downward, so that the latch tongue 4 always has a downward force in the adjustment state. When the latch tongue 4 passes the sliding surface 72 and comes to the next slot 7, the spring 19 can immediately press the latch tongue 4 into the slot 7; a plurality of third convex strips 20 are provided on the sliding boss 17, and the third convex strips 20 protrude radially from the sliding boss 17, and the third convex strips 20 are vertically arranged and arranged at intervals on the surface of the sliding boss 17 along the circumference of the sliding boss 17. The third convex strips 20 reduce the contact area between the sliding boss 17 and the slot wall of the sliding guide groove 18, thereby reducing friction, which is conducive to the smooth lifting and lowering of the latch tongue 4.

[0053] The upper end of the rotating shaft 15 has a vertically arranged positioning surface 21, which is arranged forward and is a shaft milling plane; a corresponding insertion hole 22 is provided on the limiting member 5, and the cross-sectional shape of the insertion hole 22 is adapted to the positioning surface 21, and the rotating upper end is arranged in the insertion hole 22 and the limiting member 5 is locked with the rotating shaft 15 by a screw; the positioning surface 21 is configured to make the rotating shaft 15 and the limiting member 5 rotate synchronously; the limiting member 5 includes a disc-shaped main body 51 and a lifting platform 52 protruding downward from the main body 51, and correspondingly, a vertically arranged accommodating cavity (not numbered) is provided on the telescopic member 2, and the limiting member 5 is arranged in the accommodating cavity, and the accommodating cavity is connected to the sliding guide groove 18 only through the shaft hole 16, so during installation, it is necessary First, place the limiter 5 and the latch 4 into the accommodating cavity and the sliding guide groove 18 respectively, then insert the upper end of the rotating shaft 15 into the insertion hole 22, and finally lock the limiter 5 and the latch 4 by screws; the accommodating cavity includes a circular groove 23 for accommodating the main body 51 and a sinking groove 24 for accommodating the lifting platform 52, and the sinking groove 24 is located below the circular groove 23, and the two are connected to each other; in the adjustment state, the lifting platform 52 is located in the sinking groove 24 (when the latch 4 moves in the clamping part 33, the lifting platform 52 is always located in the sinking groove 24 and moves up and down, and the bottom surface of the lifting platform 52 will not exceed the inclined rotating surface 25 when the lifting height is the highest); when switching from the adjustment state to the self-locking state, the lifting platform 52 rises from the sinking groove 24 and then rotates to enter The lifting platform 52 is inserted into the circular groove 23; in the self-locking state, the lifting platform 52 is located in the circular groove 23 and the lifting platform 52 is against the bottom surface of the circular groove 23; an inclined rotating surface 25 is provided between the circular groove 23 and the sinking groove 24, that is, there should be a vertical corner from the groove wall of the sinking groove 24 to the bottom surface of the circular groove 23, but due to the existence of the rotating surface 25, the corner is replaced, so that the groove wall of the sinking groove 24 to the bottom surface of the circular groove 23 is smoother (the existence of the rotating surface 25 not only makes the movement more stable and smooth, but also has a function to convert the horizontal rotation into an ascending movement); the limiting member 5 is located in the accommodating cavity, and in order to match the shape of the limiting member 5, the accommodating cavity includes the circular groove 23 and the sinking groove 24. When the latch tongue 4 moves on the sliding surface 72, the lifting platform 52 It will also be lifted in the sinking groove 24, and the bottom surface of the lifting platform 52 will not exceed the sinking groove 24 and enter the circular groove 23. Only when the tongue 4 moves on the rising inclined surface 9, the bottom surface of the lifting platform 52 rises to the height of the rotating surface 25, and can enter the circular groove 23 from the sinking groove 24, but the limit member 5 needs to rotate to abut against the bottom surface of the circular groove 23, that is, the tongue 4 drives the limit member 5 to rotate under the action of the stopping surface 10 and the rotating sliding surface 11. When the limit member 5 rotates, the existence of the rotating surface 25 facilitates the lifting platform 52 to enter the circular groove 23 from the sinking groove 24. After the lifting platform 52 abuts against the bottom surface of the circular groove 23, the spring 19 is compressed and due to the support of the lifting platform 52, the spring 19 cannot press the tongue 4 into the groove 7.

[0054] like Fig.10As shown, a rotation limiting portion 53 is also provided on the main body 51 of the limiting member 5, which protrudes radially from the main body 51 along the main body 51. Correspondingly, a rotation limiting groove 26 is provided on the telescopic member 2 beside the circular groove 23, and the rotation limiting groove 26 is arranged circumferentially along the circular groove 23; the rotation limiting portion 53 is a small protrusion, and the rotation limiting groove 26 is a strip groove with an arc. The rotation limiting portion 53 is arranged in the rotation limiting groove 26 and rotates in the rotation limiting groove 26 as the limiting member 5 rotates. The two can limit the rotation of the limiting member 5 and the latch tongue 4 and determine the size of the rotation stroke; the left and right end faces of the rotation limiting groove 26 generally have an angle of 40°-50° between them, and in this embodiment, the left and right end faces of the rotation limiting groove 26 have an angle of 45°, that is, the latch tongue 4 and the limiting member 5 have a rotation stroke of 45°.

[0055] The above description of directions is only based on Figure 1 The placement posture shown is used as a reference. In actual applications, the self-locking support mechanism may be placed in other postures, and the description of the direction should also be adjusted for applicability.

[0056] When switching from the adjustment state to the self-locking state, the lifting platform 52 rises from the sinking groove 24 and then rotates to enter the circular groove 23. The lifting platform 52 rises to the same height as the inclined rotating surface 25 as the tongue 4 rises on the ascending inclined surface 9. When the tongue 4 continues to move forward and rotates under the action of the stop surface 10 and the rotating sliding surface 11, the lifting platform 52 on the limiter 5 is driven to rotate. At this time, the lifting platform 52 is connected with the inclined rotating surface 25, and rises along the rotating surface 25 to enter and abut against the bottom surface of the circular groove 23. At this time, the self-locking state is entered, and the tongue 4 is lifted by the lifting platform 52 is restricted and cannot fall back, and can no longer engage with the slot 7 of the engaging portion 33, and the latch tongue 4 can pass the engaging portion 33 backward and return to the starting portion 32; when switching from the self-locking state to the adjustment state, the latch tongue 4 has reached the starting portion 32 and conflicts with the return surface 8 of the starting portion 32, so that the latch tongue 4 continues to move backward. Under the blocking effect of the return surface 8, the latch tongue 4 rotates in the opposite direction relative to the self-locking portion 31, and the lifting platform 52 rotates in the circular groove 23 until the lifting platform 52 passes the rotating surface 25 and falls back into the sinking groove 24, and the latch tongue 4 also falls and engages with the slot 7 again.

Claims

1. A self-locking support mechanism, characterized in that include: The fixed seat has a slide groove along its length direction; A telescopic member, arranged in the slide groove and slidably matched with the fixed seat; The boss is arranged in the slide groove along the length direction of the slide groove; the boss includes a self-locking part located at the front end thereof, a starting part located at the rear end thereof, and a clamping part located between the starting part and the self-locking part; the clamping part includes a plurality of clamping grooves arranged along the length direction of the slide groove, the clamping groove has a vertical limiting surface and an inclined sliding surface, the limiting surface is located at the rear side of the clamping groove, and the sliding surface is located at the front side of the clamping groove; the starting part includes a return surface facing forward; the self-locking part includes a rising inclined surface, a stopping surface and a rotating sliding surface, the rising inclined surface is located behind the stopping surface and the rotating sliding surface, the rotating sliding surface is arranged horizontally, the stopping surface is located beside the rotating sliding surface and the stopping surface is an upwardly inclined inclined surface; The latch tongue is arranged toward the boss and is slidably arranged on the telescopic member along the width direction of the telescopic member, and the latch tongue is rotatably matched with the telescopic member; when the latch tongue enters the slot, the latch tongue is engaged with the slot, and the latch tongue is limited by the limiting surface and supports the telescopic member with a tendency to move backward to stay at the current position; when the telescopic member slides forward in the slide groove, the latch tongue slides on the sliding surface and enters the next slot; A limiting member is arranged on the telescopic member and is fixedly connected to the latch tongue; the limiting member is configured to limit the latch tongue to a current state when the latch tongue rotates; The self-locking support mechanism has an adjustment state and a self-locking state; in the adjustment state, the latch tongue is located at the latching portion and is latched with the latch slot, and the telescopic member can slide forward, and the latch tongue switches between the latch slots accordingly; in the adjustment state, when the telescopic member has a tendency to move backward, the limiting surface limits the latch tongue and supports the telescopic member to stay in the current position; When switching from the adjustment state to the self-locking state, the latch tongue moves forward with the telescopic part, passes through the clamping part and enters the self-locking part from the rising inclined surface. When the latch tongue passes through the rising inclined surface and enters the rotating sliding surface, the stop surface blocks one of the left and right ends of the latch tongue, and the latch tongue slides and rotates on the rotating sliding surface. At this time, the limit member restricts the latch tongue to this state, and the self-locking support mechanism enters the self-locking state; in the self-locking state, the latch tongue can move backward and directly pass over the clamping part; after passing the clamping part, the latch tongue contacts the return surface of the starting part and rotates back, and the latch tongue enters the clamping groove of the clamping part again, and the self-locking support mechanism switches from the self-locking state back to the adjustment state.

2. The self-locking support mechanism according to claim 1, characterized in that: A rotating shaft is protruded upwardly from the latch tongue, and correspondingly, an axial hole is provided on the telescopic member, the rotating shaft is inserted into the axial hole of the telescopic member and rotatably cooperates with the telescopic member.

3. The self-locking support mechanism according to claim 2, characterized in that: The lower end of the rotating shaft is provided with a sliding boss protruding from the rotating shaft in the radial direction of the rotating shaft, and the telescopic member is provided with a sliding guide groove correspondingly below the shaft hole, and the sliding boss is inserted in the sliding guide groove and slidably cooperates with the sliding guide groove.

4. The self-locking support mechanism according to claim 3, characterized in that: A spring is sleeved on the rotating shaft above the sliding boss. The spring is located in the sliding guide groove, and its two ends respectively abut against the top surface of the sliding guide groove and the sliding boss. The spring acts on the sliding boss and gives the latch a downward elastic force to engage the latch groove.

5. The self-locking support mechanism according to claim 2, characterized in that: The upper end of the rotating shaft has a positioning surface, and a corresponding insertion hole is opened on the limiting member. The upper end of the rotating shaft is inserted into the insertion hole and the limiting member and the rotating shaft are locked by a screw; the positioning surface is configured to make the rotating shaft and the limiting member rotate synchronously.

6. The self-locking support mechanism according to claim 1, characterized in that: The limiting member includes a disc-shaped main body and a lifting platform protruding downward from the main body. Correspondingly, a accommodating cavity is opened on the telescopic member, and the limiting member is arranged in the accommodating cavity; the accommodating cavity includes a circular groove for accommodating the main body and a sinking groove for accommodating the lifting platform, and the sinking groove is located below the circular groove; in the adjustment state, the lifting platform is located in the sinking groove; when switching from the adjustment state to the self-locking state, the lifting platform rises from the sinking groove and then rotates to enter the circular groove; in the self-locking state, the lifting platform is located in the circular groove and the lifting platform is against the bottom surface of the circular groove.

7. The self-locking support mechanism according to claim 6, characterized in that: An inclined rotating surface is arranged between the circular groove and the sinking groove.

8. The self-locking support mechanism according to claim 6, characterized in that: The main body is also provided with a rotation limiting portion which protrudes radially from the main body. Correspondingly, a rotation limiting groove is opened on the telescopic member beside the circular groove, and the rotation limiting groove is arranged along the circumference of the circular groove. The rotation limiting portion is arranged in the rotation limiting groove and rotates in the rotation limiting groove as the limiting member rotates.

9. The self-locking support mechanism according to claim 8, characterized in that: There is an angle of 40°-50° between the left and right end faces of the rotation limiting groove.

10. The self-locking support mechanism according to claim 1, characterized in that: The fixing seat comprises a box body and a cover plate, the slide groove is arranged on the box body, the telescopic member is arranged in the slide groove and is covered by the cover plate.

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