WO2020155134A1

WO2020155134A1 - Safety support lifting control upright column and liftable guardrail

Info

Publication number: WO2020155134A1
Application number: PCT/CN2019/074523
Authority: WO
Inventors: 羽柴由伦
Original assignee: 羽柴由伦; 汪子建; 杭州二向箔信息技术有限公司
Priority date: 2019-02-02
Filing date: 2019-02-02
Publication date: 2020-08-06

Abstract

Disclosed are a safety support lifting control upright column and a liftable guardrail. The safety support lifting control upright column comprises: a connector (2) arranged on an upright column (1), wherein the connector (2) comprises a fixed member (21) arranged on the upright column and a moving member (22) connected to a lifting mechanism (3); the connector (2) further comprises a first lock (211) and a second lock (212) arranged on the fixed member (21); the first lock (211) locks a lifting state of the moving member (22); and the second lock (212) locks an opening or locking state of the first lock (211). The safety support lifting control upright column and the liftable guardrail realize dual protection by means of the first lock (211) and the second lock (212), are suitable for various usage environments requiring lifting guardrails, particularly for bed guardrails for children, and effectively avoid, by means of dual safety, the risk of a guardrail lifting support suddenly sliding downwards when a button is intentionally or unintentionally pressed, and children are protected from falling.

Description

Safety supporting lifting control column and lifting guardrail

Technical field

The embodiment of the present invention relates to the technical field of supporting protective articles, in particular to a liftable safety supporting bed guardrail.

Background technique

This section introduces readers to background technologies that may be relevant to various aspects of the embodiments of the present invention, and is believed to provide readers with useful background information, thereby helping readers to better understand various aspects of the embodiments of the present invention. Therefore, it can be understood that the description in this section is for the above-mentioned purpose, and does not constitute an acknowledgement of the prior art.

In order to ensure that children will not fall out of the bed while crawling or playing, parents usually choose to use a bed with a guardrail or add a guardrail to the existing bed. In order to prevent children from climbing out of the guardrail, the guardrail of the current crib is generally made relatively high. Although a taller guardrail can prevent children from crawling out of the bed, a fixed-height guardrail is inconvenient for the child to be carried in and out of the bed compared to a shorter person.

The current bed guardrail generally also has a folding device. When the baby needs to be taken off the bed, the bed guardrail frame can be turned outward and folded down. However, the folding device of the bed guardrail currently on the market has a complicated structure, the bed guardrail is inconvenient to operate when folded, and the railing is easy to rub against the floor after folding. In order to avoid this problem, the existing bed guardrail is set up and down, and the height of the guardrail is adjusted by controlling the height of the crossbar.

The traditional bed guardrail lifting control device is controlled by a button. Press the button and the positioning protruding rod exits the positioning hole on the guardrail bracket, and the lifting bracket can slide up and down to reach the positioning hole of the required height, release the button to position The protruding rod is inserted into the positioning hole on the guardrail bracket to be fixed. When the child presses the button intentionally or unintentionally, the guardrail lifting bracket will suddenly slide down, causing the child to lose the balance of the center of gravity and fall out of the bed. Therefore, the development of a safe and reliable bed guardrail lifting control device, which can effectively prevent children from touching by mistake, has become an urgent problem for those skilled in the art.

Summary of the invention

The technical problem to be solved is how to provide safe support for lifting control columns and lifting guardrails.

In view of the defects in the prior art, the embodiments of the present invention provide a safety support lifting control column and a liftable guardrail, which can double insurance and effectively avoid the risk of a sudden drop of the guardrail lifting bracket caused by accidental collision.

In the first aspect, an embodiment of the present invention provides a safety support lifting control column, including:

A connecting piece arranged on the column, the connecting piece comprising a fixed piece arranged on the column and a moving piece connected to the lifting mechanism;

The connecting member further includes a first lock and a second lock provided on the fixing member;

The first lock locks the lifting state of the moving part, and the second lock locks the open or locked state of the first lock.

Optionally, the first lock includes a retractable lifting elastic pin, and a locking through hole is provided on the column or the fixing member;

The lifting elastic pin expands and contracts inside and outside the locking through hole to lock or unlock the lock tongue on the moving part;

After the moving part and the fixed part are butted, the lifting elastic pin is exposed from the locking through hole, and the lifting elastic pin clamps the lock tongue to tightly lock the moving part and the fixed part .

Optionally, the first lock further includes a lifting elastic pin bracket, the lifting elastic pin bracket is arranged in the fixing member, and the lifting elastic pin is elastically stretched inside and outside the elastic pin bracket;

The lifting elastic pin bracket is connected with a toggle switch, and the toggle switch drives the lifting elastic pin bracket to move, so that the elastic pin expands and contracts inside and outside the locking through hole.

Optionally, a toggle switch window is provided on the fixing member;

The toggle switch includes a toggle block;

A protrusion is provided on the shift block, the shape of the protrusion is equivalent to the shape of the toggle switch window, and the protrusion is flush with the outer surface of the fixing member.

Optionally, an elastic lifting device is provided in the shift block, and the elastic lifting device supports and holds the protrusion so as to be flush with the outer surface of the fixing member;

When the shifting block is pressed down, the protruding surface is lower than the inner surface of the housing of the fixing part, so that the shifting block is moved in the housing of the fixing part.

Optionally, a toggle recess is provided on the protrusion.

Optionally, the second lock includes: a toggle piece connected to a limit slider; a notch for the movement of the toggle piece is provided on the housing of the fixing member;

The limiting slider is arranged in the fixing member; the locking state of the limiting slider is on the side of the lifting elastic pin bracket, and the limiting block restricts the movement of the lifting elastic pin bracket.

Optionally, the limiting block has a wedge shape.

Optionally, the second lock is arranged at a corner of the connecting piece.

Optionally, a protrusion is provided at the bottom of the dial plate, and a recess corresponding to the protrusion is provided on the outer surface of the fixing member; the protrusion is locked into the recess after the second lock is opened.

Optionally, the dial plate further includes a neck portion connected to the limiting slider, and the distance between the neck portion and the protrusion is equal to the width of the gap.

Optionally, convex ribs are provided on both sides of the lock tongue.

Optionally, the lock tongue has a chamfered surface on a side close to the lifting elastic pin.

Optionally, the moving member further includes a crossbar connecting portion: the crossbar connecting portion includes:

A crossbar socket provided on the moving part, and a crossbar limit hole is provided on the crossbar socket;

The outer diameter of the crossbar is smaller than the inner diameter of the crossbar socket, and the crossbar is butted with the crossbar socket, and the end of the crossbar is butted and covered therein;

The end of the crossbar is provided with a crossbar elastic pin, the crossbar elastic pin is provided inside the crossbar, the end side wall of the crossbar is provided with a crossbar through hole, and the crossbar is elastic The pin elastically expands and contracts inside and outside the through hole of the crossbar;

After the end of the cross bar meets the cross bar socket, the elastic pin is exposed from the through hole of the cross bar, and the cross bar elastic pin is locked into the limit hole of the cross bar to make the cross bar The end of the rod is tightly locked with the connecting part of the crossbar.

Optionally, it further includes a V-shaped elastic piece arranged on the inner side of the end of the crossbar, the V-shaped elastic piece includes a first arm and a second arm, and the crossbar elastic pin is fixed on the first arm, The second arm abuts on the inner side of the end of the crossbar.

Optionally, the fixing member further includes a vertical rod connecting part, the vertical rod connecting part includes a vertical rod socket provided on the fixing part, and a vertical rod socket for the upper horizontal rod to slide up and down is inserted into the vertical rod socket. Vertical rod.

On the other hand, the present invention also provides a liftable guardrail, comprising at least two of the above-mentioned safety supporting lifting control columns; the bottom of the safety supporting lifting control column is connected to the supporting assembly;

It also includes an upper crossbar connected to the two moving parts of the safety support lifting control column and a lower crossbar connected to the bottom connecting part of the safety support lifting control column;

A protective shield is provided between the upper crossbar and the lower crossbar.

It can be seen from the above technical solutions that the safety supporting lifting control column and the lifting guardrail provided by the embodiments of the present invention can be applied to various use environments that require lifting guardrails through the double protection of the first lock and the second lock, especially suitable for Children's bed guardrail protects children from falling, and at the same time, double insurance effectively avoids the risk of sudden sliding of the guardrail lifting bracket when the button is pressed intentionally or unintentionally.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of a structure of a safety supporting lifting control column in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the safety support lift control column in the use state of the embodiment shown in FIG. 1;

3 is an exploded schematic view of the structure of the fixing member that safely supports the lifting control column in the embodiment shown in FIG. 1;

4 is a schematic cross-sectional view of the lifting and inserting state of a safety support lifting control column in an embodiment of the present invention;

Figure 5 is an exploded schematic view of the first lock structure in the embodiment shown in Figure 1;

Fig. 6 is a schematic structural diagram of a safety support lifting control column in use state shown in an embodiment of the present invention;

7 is a schematic cross-sectional view of a second lock locked state of a safety support lifting control column in an embodiment of the present invention;

8 is a partial enlarged schematic diagram of the structure of the moving part in the embodiment shown in FIG. 1;

Fig. 9 is a schematic structural diagram of a safety support lifting control column in use state according to an embodiment of the present invention;

10 is a schematic cross-sectional view of the second lock of a safety support lifting control column in an open state in an embodiment of the present invention;

Figure 11 is a schematic diagram of the overall structure of the liftable guardrail in an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in Figures 1 to 3, the embodiment of the present invention provides a safety support lifting control column, comprising: a connecting piece 2 arranged on the column 1, and the connecting piece 2 includes a fixing piece 21 arranged on the column and a connecting lifting The moving part 22 of the mechanism 3; the connecting part 2 further includes a first lock 211 and a second lock 212 arranged on the fixed part 21; the first lock 211 locks the lifting state of the moving part 22, The second lock 212 locks the opened or locked state of the first lock 211. The following is a detailed description of the safety support lifting control column provided by the embodiment of the present invention.

In the present invention, as shown in FIG. 1 and FIG. 2, the lifting mechanism can be connected through the connecting member 2 arranged on the column 1, and the lifting mechanism can be detachably raised and lowered by the fixing member 1 and the moving member 2. The lifting state of the moving member 22 is locked by the first lock 211, and the open or locked state of the first lock 211 is further locked and locked by the second lock 212. The double insurance of the first lock 211 and the second lock 212 can effectively avoid the risk of a sudden drop of the guardrail lifting bracket when a child intentionally or unintentionally presses the button of the first lock 211 or the second lock 212.

As shown in Figures 3 and 4, the first lock 211 includes a retractable lifting elastic pin 201, and a locking through hole 200 is provided on the column or the fixing member; The through hole 200 telescopes inside and outside to lock or unlock the locking tongue 221 on the moving part 22; after the moving part 22 and the fixed part 21 are butted, the lifting elastic pin 201 is exposed from the locking through hole 200, The lifting elastic pin 201 clamps the locking tongue 221 to tightly lock the moving part 22 and the fixed part 21.

As shown in FIGS. 3 and 5, the first lock 211 further includes a lifting elastic pin bracket 202, the lifting elastic pin bracket 202 is arranged in the fixing member 21, and the lifting elastic pin 201 is mounted on the elastic pin bracket 202. The inside and outside are elastically expanded and contracted; for example, a spring is connected to the lifting elastic pin 201, and the spring supports the elastic pin to keep out of the elastic pin bracket 202. The lifting elastic pin bracket 202 is connected to a toggle switch 215, and the toggle switch 215 drives the lifting elastic pin bracket 202 to move, so that the elastic pin 201 expands and contracts inside and outside the locking through hole 200.

3 and 5, the fixing member 21 is provided with a toggle switch window 20; the toggle switch 215 includes a toggle block 216; the toggle block is provided with a protrusion 217, the shape of the protrusion 217 Corresponding to the shape of the toggle switch window 200, the protrusion 217 is flush with the outer surface of the fixing member 21. An elastic lifting device 218 is provided in the shift block 216, and the elastic lifting device 218 supports and holds the protrusion 217 so as to be flush with the outer surface of the fixing member 21; press down the shift block 216, the The surface of the protrusion 217 is lower than the inner surface of the housing of the fixing member 21, so that the shifting block 216 is reciprocated in the housing of the fixing member 21. In order to facilitate the manipulation of the dial block 216 with fingers, a dial recess 219 is provided on the protrusion 217.

As shown in FIG. 6, the second lock 212 includes: a toggle piece 213 connected to the limit slider 214; the housing of the fixing member 21 is provided with a gap for the toggle piece to move 210; the limiting slider 214 is disposed in the fixing member 21; the locking state of the limiting slider 214 is on the side of the lifting elastic pin bracket 202, and the limiting block 214 restricts the lifting elasticity The pin holder 202 moves. As shown in FIG. 5, in order to facilitate the movement of the limiting slider in the fixing member 21, the limiting block 214 has a wedge shape. As shown in FIGS. 4 to 7, the second lock 212 is arranged at the corner of the fixing member 21. In order to further maintain the opened or locked state of the second lock 212, a protrusion 206 is provided at the bottom of the toggle piece 213, and the outer surface of the fixing member 21 is provided with a recess 205 corresponding to the protrusion 206. As shown in FIG. 6, after the second lock 212 is opened, the protrusion 206 is locked into the recess 205. This can effectively prevent the toggle piece from changing the opening state of the second lock 212 when it is touched by mistake. Further, the dial piece 213 further includes a neck portion connected to the limiting slider 214, and the distance between the neck portion and the protrusion 206 is less than or equal to the width of the gap 210. As shown in FIG. 7, after the second lock 212 is locked, the protrusion 206 is locked into the notch 210. This can effectively prevent the shifting piece from changing the locking state of the second lock 212 when it is touched by mistake.

As shown in FIG. 8, in order to ensure that the lock tongue 221 is aligned with the lifting elastic pin 201 when the moving part 22 and the fixed part 21 are butted, the lock tongue 221 is provided with ribs 223 on both sides. Further, in order to facilitate the lifting elastic pin 201 to be smoothly compressed to the locking through hole 200 when the locking tongue approaches the lifting elastic pin 201, the side of the locking tongue 221 close to the lifting elastic pin 201 has a chamfered surface.

As shown in FIGS. 8 to 10, the moving part 22 further includes a cross-bar connecting portion 230: the cross-bar connecting portion 230 includes: a cross-bar socket 233 provided on the moving part 22, the cross-bar socket 233 is provided with a cross-bar limiting hole 203; the outer diameter of the cross-bar 14 is smaller than the inner diameter of the cross-bar socket 233, the cross-bar 13 and the cross-bar socket 233 butt to connect the end of the cross-bar 14 The end of the cross bar 14 is provided with a cross bar elastic pin 131, the cross bar elastic pin 131 is provided inside the cross bar 14, and the side wall of the end of the cross bar 14 A cross-bar through hole 103 is provided, and the cross-bar elastic pin 131 is elastically stretched inside and outside the cross-bar through-hole 103; after the end of the cross-bar meets the cross-bar socket 233, the elastic pin 131 Exposed from the cross-bar through hole 103, the cross-bar elastic pin 131 is clamped into the cross-bar limiting hole 203 so that the end of the cross-bar 14 and the cross-bar connecting portion 230 are tightly locked. As shown in FIG. 9, it also includes a V-shaped elastic piece 133 arranged on the inner side of the end of the cross bar 14. The V-shaped elastic piece 133 includes a first arm and a second arm. On the first arm, the second arm abuts on the inner side of the end of the crossbar 14.

As shown in Figures 8 to 10, in order to ensure the smooth lifting and lowering of the crossbar 14, the safety support lifting control column provided by the embodiment of the present invention further includes a vertical rod connecting portion 260, and the vertical rod connecting portion 260 includes A vertical rod socket on the fixing member 21, into which a vertical rod 16 for the upper horizontal rod 14 to slide up and down is inserted into the vertical rod socket. When it is necessary to lift the baby from the bed, the upper cross bar 14 can be slid down along the vertical bar 16 to lower the guardrail, so as to facilitate the child to be carried out.

As shown in FIG. 11, in order to further demonstrate the advancement of the safety support lifting control column provided by the embodiment of the present invention, the embodiment of the present invention also provides a liftable guardrail using the above safety support lifting control column. The liftable guardrail It includes at least two of the above-mentioned safety support lift control columns; the bottom of the safety support lift control column is connected to the support assembly 10; and also includes an upper cross bar 14 connected with the moving parts of the two safety support lift control columns and The lower cross bar 13 is connected to the bottom connecting piece of the safety supporting lifting control column; a protective shield 15 is provided between the upper cross bar 14 and the lower cross bar 13. When it is necessary to lift the baby from the bed, the upper cross bar 14 can be slid down along the vertical bar 16 to lower the guardrail, so as to facilitate the child to be carried out.

In summary, it can be seen from the above technical solutions that the embodiment of the present invention provides a safety support lift control column and a liftable guardrail, which can be applied to various use environments that require a lift guardrail through the dual protection of the first lock and the second lock , Especially suitable for children's bed guardrails. While protecting children from falling, double insurance can effectively avoid the risk of the guardrail lifting bracket suddenly sliding down when the button is pressed intentionally or unintentionally.

Finally, it should be noted that in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower" , "Front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" , "Axial", "Radial", "Circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The referred device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

In addition, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any existence between these entities or operations. This actual relationship or sequence cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes those that are not explicitly listed Other elements of, or also include elements inherent to this process, method, article or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other same elements in the process, method, article, or equipment that includes the element. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and "fixed" should be interpreted broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be a communication and interaction relationship between two components, unless specifically defined otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the specification of the present invention, a lot of specific details are explained. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structure, materials or features are included in at least one embodiment or example of the present invention. In some instances, well-known methods, structures and technologies are not shown in detail so as not to obscure the understanding of this specification. Similarly, it should be understood that in order to simplify the disclosure of the present invention and help understand one or more of the various aspects of the invention, in the above description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment. , Figure, or its description. However, the interpretation of the disclosed method should not reflect the intention that the claimed invention requires more features than those explicitly recorded in each claim. More precisely, as reflected in the claims, the inventive aspect lies in less than all the features of a single embodiment disclosed previously. Therefore, the claims following the specific embodiment are thus explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. It should be noted that the embodiments in the application and the specific features, structures, materials, or characteristics described in the embodiments can be combined with each other under the condition of no conflict or contradiction. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or replacement of these aspects and/or embodiments. In addition, those skilled in the art may use each aspect and/or embodiment of the present invention alone or in combination with one or more other aspects and/or embodiments, provided that they are not mutually contradictory.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention The scope shall be included in the scope of the claims and specification of the present invention. .

Industrial applicability

The embodiment of the present invention provides a safety support lifting control column and a liftable guardrail. The double protection of the first lock and the second lock can be applied to various use environments that require lifting guardrails, especially suitable for children's bed guardrails. While protecting children from falling, the double insurance effectively avoids the risk of the guardrail lifting bracket suddenly falling when the button is pressed intentionally or unintentionally. It has high economic and social benefits, and has industrial practicability.

Claims

A safety supporting lifting control column, characterized in that it comprises:

A connecting piece arranged on the column, the connecting piece comprising a fixed piece arranged on the column and a moving piece connected to the lifting mechanism;

The connecting member further includes a first lock and a second lock provided on the fixing member;

The first lock locks the lifting state of the moving part, and the second lock locks the open or locked state of the first lock.
The safety support lifting control column according to claim 1, wherein the first lock comprises a retractable lifting elastic pin, and a locking through hole is provided on the column or the fixing member;

The lifting elastic pin expands and contracts inside and outside the locking through hole to lock or unlock the lock tongue on the moving part;

After the moving part and the fixed part are butted, the lifting elastic pin is exposed from the locking through hole, and the lifting elastic pin clamps the lock tongue to tightly lock the moving part and the fixed part .
The safety support lifting control column according to claim 2, wherein the first lock further comprises a lifting elastic pin bracket, the lifting elastic pin bracket is arranged in the fixing member, and the lifting elastic pin is in the elastic The pin bracket is elastically stretched inside and outside;

The lifting elastic pin bracket is connected with a toggle switch, and the toggle switch drives the lifting elastic pin bracket to move, so that the elastic pin expands and contracts inside and outside the locking through hole.
The safety support lifting control column according to claim 3, characterized in that:

A toggle switch window is provided on the fixing part;

The toggle switch includes a toggle block;

A protrusion is provided on the shift block, the shape of the protrusion is equivalent to the shape of the toggle switch window, and the protrusion is flush with the outer surface of the fixing member.
The safety supporting lifting control column according to claim 4, wherein an elastic lifting device is provided in the shift block, and the elastic lifting device supports and holds the protrusion so as to be flush with the outer surface of the fixing member ；

When the shifting block is pressed down, the protruding surface is lower than the inner surface of the housing of the fixing part, so that the shifting block is moved in the housing of the fixing part.
The safety support lifting control column according to claim 4 or 5, wherein the protrusion is provided with a toggle recess.
The safety support lifting control column according to claim 3, wherein the second lock comprises: a toggle piece connected to a limit slider; the housing of the fixing member is provided with The gap in the movement of the slider;

The limiting slider is arranged in the fixing member; the locking state of the limiting slider is on the side of the lifting elastic pin bracket, and the limiting block restricts the movement of the lifting elastic pin bracket.
The safety support lifting control column according to claim 7, wherein:

The limiting block is wedge-shaped.
The safety support lifting control column according to claim 7, wherein the second lock is arranged at a corner of the connecting member.
The safety support lifting control column according to claim 7, wherein the bottom of the toggle piece is provided with a protrusion, and the outer surface of the fixing member is provided with a recess corresponding to the protrusion; the second lock is unlocked Later, the protrusion is locked into the recess.
The safety support lifting control column according to claim 10, wherein the toggle piece further comprises a neck portion, the neck portion is connected to the limiting slider, and the gap between the neck portion and the protrusion The distance is equal to the width of the gap.
The safety support lifting control column according to claim 2, wherein the two sides of the lock tongue are provided with convex ribs.
The safety support lifting control column according to claim 2, wherein the side of the lock tongue close to the lifting elastic pin has a chamfered surface.
The safety support lifting control column according to claim 2, characterized in that:

The moving part further includes a crossbar connecting part: the crossbar connecting part includes:

A crossbar socket provided on the moving part, and a crossbar limit hole is provided on the crossbar socket;

The outer diameter of the crossbar is smaller than the inner diameter of the crossbar socket, and the crossbar is butted with the crossbar socket, and the end of the crossbar is butted and covered therein;

The end of the crossbar is provided with a crossbar elastic pin, the crossbar elastic pin is provided inside the crossbar, the end side wall of the crossbar is provided with a crossbar through hole, and the crossbar is elastic The pin elastically expands and contracts inside and outside the through hole of the crossbar;

After the end of the cross bar meets the cross bar socket, the elastic pin is exposed from the through hole of the cross bar, and the cross bar elastic pin is locked into the limit hole of the cross bar to make the cross bar The end of the rod is tightly locked with the connecting part of the crossbar.
The safety support lifting control column according to claim 14, further comprising a V-shaped elastic piece arranged inside the end of the cross bar, the V-shaped elastic piece comprising a first arm and a second arm, and An elastic pin of the crossbar is fixed on the first arm, and the second arm abuts against the inner side of the end of the crossbar.
The safety support lifting control column according to claim 2, characterized in that:

The fixing member further includes a vertical rod connecting part, the vertical rod connecting part includes a vertical rod socket provided on the fixing part, and a vertical rod for the upper horizontal rod to slide up and down is inserted into the vertical rod socket.
A liftable guardrail, which is characterized by comprising at least two safety support lifting control columns according to any one of claims 1-16; the bottom of the safety support lifting control column is connected with the support assembly;

It also includes an upper crossbar connected to the two moving parts of the safety support lifting control column and a lower crossbar connected to the bottom connecting part of the safety support lifting control column;

A protective shield is provided between the upper crossbar and the lower crossbar.