CN215304486U - Guard bar - Google Patents

Abstract

The utility model discloses a guardrail, which is arranged outside a bed body to play a role in protection; the device comprises a telescopic horizontal support with two free ends and vertical supporting rods respectively vertically connected to the two free ends, wherein each vertical supporting rod comprises an inner pipe and an outer pipe which can slide relatively; the two ends of the two outer pipes are respectively and rotatably connected with a vertical support with two free ends, and the two outer pipes are connected through a plurality of transverse supporting rods. Through the mode, the folding bed is simple in structure and can be quickly folded and unfolded, the main guardrail formed by connecting the transverse supporting rods and the vertical supporting rods is arranged, the vertical supporting rods have a height gear adjusting function, the side guardrails are rotatably connected to two sides of the main guardrail and can be rotated and folded, the bottom end of the main guardrail is connected with the horizontal installation frame with a telescopic function, and the length of the installation frame can be adjusted according to the size of the bed.

Description

Guard bar

Technical Field

The utility model relates to the field of household protection, in particular to a guardrail.

Background

The bed is a household product necessary for families and is used for people to rest, and for infants or children, due to the fact that the infants or children are younger in age and can easily roll and fall when sleeping on the bed alone, adults need to look aside, therefore most beds can be provided with guardrails, but the existing bed guardrails are inconvenient to use and install.

The prior art discloses an up-and-down folding bed guardrail, which comprises an upper enclosing rod assembly, two side enclosing rod assemblies, a lower enclosing rod assembly and two sliding sleeves, wherein two ends of each side enclosing rod assembly are respectively rotatably connected with the lower enclosing rod assembly and the sliding sleeves; each sliding sleeve is provided with a surrounding rod hole and a buckle hole communicated with the surrounding rod hole, each upper surrounding rod assembly comprises an elastic pin, the two ends of each upper surrounding rod assembly are contained in two surrounding rod holes, the elastic pins are buckled with the buckle holes to enable the upper folding bed guardrail and the lower folding bed guardrail to be in a locking state, and when the elastic pins are separated from the buckle holes, the two sliding sleeves move in opposite directions along the upper surrounding rod assemblies and drive the two side surrounding rod assemblies to be opposite to each other, and the lower surrounding rod assemblies rotate to enable the upper folding bed guardrail and the lower folding bed guardrail to be folded.

Although this kind of technique compares in the bed guardrail on the market, can receive and release fast, but it does not possess the side guardrail that can follow both sides to middle folding, and the main guardrail does not possess the height control gear, and horizontal mounting bracket can not stretch out and draw back in order to adapt to the different bed bodies.

Therefore, it is necessary to design a guardrail which has a simple structure, is convenient to fold and unfold, is provided with foldable side guardrails, is provided with a height adjusting gear and has a telescopic function on a horizontal mounting frame.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems, the utility model provides a guardrail, wherein a main guardrail is formed by connecting a transverse support rod and a vertical support rod, the vertical support rod has a height gear adjusting function, side guardrails are rotatably connected to two sides of the main guardrail and can be rotated and folded, and a horizontal mounting frame with a telescopic function is connected to the bottom end of the main guardrail so as to adjust the length of the mounting frame according to the size of a bed body.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a guardrail is arranged outside a bed body to play a role in protection; the device comprises a telescopic horizontal support with two free ends and vertical supporting rods respectively vertically connected to the two free ends, wherein each vertical supporting rod comprises an inner pipe and an outer pipe which can slide relatively; the two ends of the two outer pipes are respectively and rotatably connected with a vertical support with two free ends, and the two outer pipes are connected through a plurality of transverse supporting rods.

Furthermore, the lower end of the outer pipe is provided with a first connecting seat, and the upper end of the outer pipe is provided with a second connecting seat; and the peripheral walls of the first connecting seat and the second connecting seat are respectively provided with a first gear, and two free ends of the vertical support are respectively provided with a second gear meshed with the first gears.

Furthermore, the inner pipe is sleeved in the outer pipe, the outer pipe slides up and down relative to the inner pipe, a plurality of clamping holes are formed in the peripheral wall of the inner pipe along the axis direction of the inner pipe, a connecting sleeve is sleeved on the outer side of the outer pipe, an opening is formed in the connecting sleeve, an elastic bulge is arranged at the opening, the tail end of the elastic bulge penetrates through a mounting hole formed in the peripheral wall of the outer pipe, and the elastic bulge is movably connected with the clamping holes; the lower end of the inner pipe penetrates through the first connecting seat and then is connected with the free end of the horizontal support.

Furthermore, connecting grooves are formed in the opposite sides of the two first connecting seats; and slotted holes are formed in the opposite sides of the two second connecting seats.

Furthermore, the plurality of transverse supporting rods comprise first transverse supporting rods, two ends of which are respectively accommodated in the connecting grooves, and second transverse supporting rods, two ends of which are respectively connected with the second connecting seat after penetrating through the slotted holes.

Furthermore, two limiting columns which are symmetrically arranged are sleeved in the second transverse supporting rod, and the limiting columns slide left and right relative to the second transverse supporting rod; one end of the limiting column penetrates through the second connecting seat and the first gear and then is contained in a limiting groove arranged on the second gear so as to limit the first gear and the second gear to rotate relatively.

Furthermore, first strip-shaped through holes are symmetrically formed in the peripheral wall of the second transverse supporting rod, a communication hole corresponding to the first strip-shaped through hole is formed in one end, far away from the limiting groove, of the limiting column, a rotating sleeve is sleeved at the position, corresponding to the first strip-shaped through hole, of the second transverse supporting rod, and triangular holes are formed in the positions, corresponding to the two first strip-shaped through holes, of the rotating sleeve; a pin penetrating through the communication hole, the first strip-shaped through hole and the triangular hole is arranged in an overlapping area of the communication hole, the first strip-shaped through hole and the triangular hole so as to drive the limiting column to move back and forth; a rotating handle is sleeved outside the rotating sleeve; the inner peripheral wall of the rotating handle is provided with a plurality of protruding structures, and the outer peripheral wall of the rotating sleeve is provided with a plurality of grooves connected with the protruding structures; the peripheral wall of the rotating sleeve is provided with a connecting bulge, and the peripheral wall of the rotating handle is provided with a connecting hole connected with the connecting bulge.

Furthermore, the horizontal support includes the pipe shaft that is U type structure and overlaps respectively and locates the tube socket in two free ends of pipe shaft, the lower extreme of inner tube is connected in the setting is in the mounting groove of tube socket up end.

Furthermore, the peripheral wall of the free end of the tube body is provided with a second strip-shaped through hole penetrating through the tube body, and a third strip-shaped through hole is arranged at the position, corresponding to the second strip-shaped through hole, of the tube seat; the outside of the free end cover of pipe shaft is provided with the sliding sleeve, be provided with on the sliding sleeve and run through the perforation of sliding sleeve, perforation department is provided with and passes in proper order the guide of perforation, second bar through-hole and third bar through-hole, in order to drive the pipe shaft for the pipe seat back and forth movement.

Furthermore, the upper side and the lower side of the first gear and the second gear are both provided with connecting plates, and coaxial holes are formed in the connecting plates corresponding to the rotating axes of the first gear and the second gear.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the main guardrail is formed by connecting the transverse supporting rod and the vertical supporting rod, and the vertical supporting rod has a height gear adjusting function; the two sides of the main guardrail are rotatably connected with the side guardrails which can be rotated and folded to facilitate the folding and unfolding; the bottom of main guardrail is connected with the horizontal installation frame that possesses flexible function to the length of size adjustment mounting bracket according to the bed.

2. According to the utility model, the connecting sleeve is sleeved on the outer side of the outer pipe, the elastic bulge arranged on the connecting sleeve penetrates through the connecting sleeve and then is connected with the clamping hole of the inner pipe so as to relatively fix the inner pipe and the outer pipe, when the height of the main guardrail needs to be adjusted, the outer pipe is stretched upwards, the elastic bulge leaves the current clamping hole, and when the outer pipe moves to a proper height, the elastic bulge is connected with the clamping hole corresponding to the current position of the elastic bulge, so that the outer pipe is fixed at the current height.

3. According to the utility model, two pin columns penetrating through the communication hole, the first strip-shaped through hole and the triangular hole are arranged in the overlapping area of the communication hole, the first strip-shaped through hole and the triangular hole, and the reset spring is arranged between the pin columns, so that when the rotating handle drives the rotating sleeve to rotate, the pin columns are driven to move in the triangular hole, and then the limiting columns are driven to move left and right, and the unlocking or locking of the guardrail on the opposite side is realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic illustration of an explosive structure of the present invention;

FIG. 3 is a schematic illustration of an exploded view from another perspective of the present invention;

FIG. 4 is an enlarged partial schematic view of region C of FIG. 2;

FIG. 5 is an enlarged partial schematic view of area A of FIG. 1;

FIG. 6 is an enlarged partial schematic view of region E of FIG. 2;

FIG. 7 is an enlarged partial schematic view of region B of FIG. 1;

FIG. 8 is an enlarged partial schematic view of region D of FIG. 2;

FIG. 9 is an enlarged partial schematic view of region F of FIG. 3;

the parts in the drawings are numbered as follows: 1. a horizontal support; 11. a tube body; 111. a second strip-shaped through hole; 121. a third strip-shaped through hole; 131. perforating; 14. a guide member; 12. a tube holder; 13. a sliding sleeve; 2. a vertical support; 21. a second gear; 211. a limiting groove; 22. a connecting plate; 3. a vertical strut; 31. an outer tube; 32. an inner tube; 321. a clamping hole; 33. a second connecting seat; 331. a first gear; 34. a first connecting seat; 341. connecting grooves; 35. connecting sleeves; 351. an elastic bulge; 4. a transverse strut; 41. a first transverse strut; 42. a second transverse strut; 421. a limiting column; 4211. a communicating hole; 422. a first bar-shaped through hole; 423. rotating the sleeve; 4231. a groove; 4232. a connecting projection; 4233. a triangular hole; 424. rotating the handle; 4241. a raised structure; 4242. connecting holes; 425. and (4) a pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Examples

As shown in fig. 1 to 3, a guardrail is used for being arranged outside a bed body to play a role in protection; the device comprises a telescopic horizontal bracket 1 with two free ends and vertical supporting rods 3 vertically connected to the two free ends respectively, wherein the vertical supporting rods 3 comprise an inner pipe 32 and an outer pipe 31 which can slide relatively; two ends of the outer pipe 31 are respectively rotatably connected with a vertical support 2 with two free ends, and the outer pipe 31 is connected with the vertical support 2 through a plurality of transverse supporting rods 4.

Wherein, vertical branch 3 and horizontal branch 4 are connected each other and are constituted main guardrail, and vertical support 2 is connected in the both sides of main guardrail as the side guardrail, connects in the horizontal stand 1 of main guardrail bottom as the mounting bracket and is connected with the bed body.

So set up, the vertical branch 3 of main guardrail has the altitude mixture control function through inside and outside pipe 31 relative slip. The side guard rail rotates for main guardrail, can fold the side guard rail and pack up. The horizontal bracket 1 has a telescopic function and can adjust the length according to the size of the bed.

As shown in fig. 2 to 3, in some embodiments, the inner tube 32 is sleeved inside the outer tube 31, and the length of the inner tube 32 is smaller than that of the outer tube 31. The outer tube 31 slides up and down relative to the inner tube 32, and then the first connecting seat 34 and the second connecting seat 33 which are connected to the outer tube 31 in a driving mode move up and down, so that the vertical support 2 connected with the first connecting seat 34 and the second connecting seat 33 is driven to move up and down, and therefore the height gear adjustment of the whole device is achieved.

As shown in fig. 4, in some embodiments, the horizontal bracket 1 includes a pipe body 11 having a U-shaped structure, and pipe seats 12 respectively fitted into two free ends of the pipe body 11, and a lower end of the inner pipe 32 is connected to a mounting groove provided on an upper end surface of the pipe seat 12, so that the pipe seats 12 support the main guard rail.

In other embodiments, the peripheral wall of the free end of the tube body 11 is provided with a second strip-shaped through hole 111 penetrating through the tube body 11, and a third strip-shaped through hole 121 is provided at a position of the tube seat 12 corresponding to the second strip-shaped through hole 111; the outside of the free end sleeve of the tube body 11 is provided with a sliding sleeve 13, the sliding sleeve 13 is provided with a through hole 131 penetrating through the sliding sleeve 13, and the through hole 131 is provided with a guide 14 sequentially penetrating through the through hole 131, the second strip-shaped through hole 111 and the third strip-shaped through hole 121 so as to drive the tube body 11 to move back and forth relative to the tube seat 12. The width of the guide 14 is the same as the width of the second strip-shaped through hole 111. So set up, when the length of horizontal stand 1 needs to be adjusted, the user holds sliding sleeve 13 round trip movement, and sliding sleeve 13 drive guide 14 is round trip movement in third bar through-hole 121 for guide 14 drives shaft 11 round trip movement, thereby makes shaft 11 and tube socket 12 be close to or keep away from, realizes the length adjustment of horizontal stand 1.

As shown in fig. 4, the circumferential wall of the inner tube 32 is provided with a plurality of engaging holes 321 along the axial direction thereof, the outer side of the outer tube 31 is sleeved with a connecting sleeve 35, the connecting sleeve 35 is provided with an opening, and the opening is provided with an elastic protrusion 351, the tail end of which passes through a mounting hole arranged on the circumferential wall of the outer tube 31. The elastic protrusions 351 are movably connected with the plurality of clamping holes 321 to complete the fixation of the outer tube 31 and the inner tube 32; the lower end of the inner pipe 32 passes through the first connecting seat 34 and then is connected with the free end of the horizontal bracket 1. So set up, when the height of guardrail needs to be adjusted, with outer tube 31 tensile upwards, elastic bulge 351 leaves current joint hole 321. When the outer tube 31 is moved to a suitable height, the elastic protrusion 351 is connected to the corresponding latch hole 321 at the current position, so that the outer tube 31 is fixed at the current height.

As shown in fig. 4 to 7, in some embodiments, the outer tube 31 is provided at a lower end thereof with a first coupling seat 34 and at an upper end thereof with a second coupling seat 33; the first connecting seat 34 and the second connecting seat 33 are provided with a first gear 331 on the peripheral wall thereof, and the two free ends of the vertical bracket 2 are provided with second gears 21 engaged with the first gear 331. The rotation axes of the first gear 331 and the second gear 21 are both perpendicular to the plane of the main guardrail. The first gear 331 and the second gear 21 are both incomplete gears. Connecting plates 22 are arranged on the upper side and the lower side of the first gear 331 and the second gear 21, so as to protect the first gear 331 and the second gear 21. Coaxial holes are formed in the connecting plate 22 corresponding to the rotating axes of the first gear 331 and the second gear 21. So set up, when needs fold the side guard rail and receive, rotate vertical support 2, vertical support 2 drive second gear 21 rotates around the first gear 331 with it meshing to fold the side guard rail in the top of main guardrail.

In other embodiments, the opposite sides of the two first connection seats 34 are provided with connection grooves 341 (shown in fig. 2 in particular); and slotted holes are formed in the opposite sides of the two second connecting seats 33. The number of the plurality of transverse struts 4 is preferably two, and the transverse struts include a first transverse strut 41 with two ends respectively accommodated in the connecting groove 341, and a second transverse strut 42 with two ends respectively passing through the slotted hole and then being connected with the second connecting seat 33.

As shown in fig. 8 to 9 in combination with fig. 2 to 3, in some embodiments, two symmetrically disposed position-limiting columns 421 are sleeved in the second transverse strut 42, and the position-limiting columns 421 slide left and right relative to the second transverse strut 42; one end of the limiting column 421 passes through the second connecting seat 33 and the first gear 331 and then is received in the limiting groove 211 of the second gear 21, so as to limit the relative rotation of the first gear 331 and the second gear 21. So set up, spacing post 421 with first gear 331 and second gear 21 relatively fixed for when the side rail is in open mode, the rigidity of side rail can not rotate. When the side guard bar needs to be folded, the limit column 421 moves to be separated from the limit groove 211, so that the first gear 331 and the second gear 21 can rotate relatively, and the side guard bar can be folded by rotating.

In other embodiments, the peripheral wall of the second transverse strut 42 is symmetrically provided with first bar-shaped through holes 422, and one end of the limiting column 421, which is far away from the limiting groove 211, is provided with a communication hole 4211 corresponding to the first bar-shaped through hole 422. The second transverse strut 42 is sleeved with a rotating sleeve 423 at the position corresponding to the two first strip-shaped through holes 422, and triangular holes 4233 are arranged at the positions of the rotating sleeve 423 corresponding to the two first strip-shaped through holes 422. Pins 425 penetrating through the communication hole 4211, the first strip-shaped through hole 422 and the triangular hole 4233 are arranged in the overlapping area, and a return spring (not shown) accommodated in the second transverse strut 42 is arranged between the two pins 425 to drive the limiting column 421 to move back and forth. The outer side of the rotating sleeve 423 is sleeved with a rotating handle 424.

With this arrangement, when the user rotates the rotation handle 424 downward, the rotation handle 424 drives the rotation sleeve 423 to rotate, so that the pin 425 moves from the small end to the large end of the triangular hole 4233, and the pin 425 moves leftward relative to the second transverse strut 42, thereby driving the stopper 421 to move leftward.

The inner peripheral wall of the rotating handle 424 is provided with a plurality of boss structures 4241, and the outer peripheral wall of the rotating sleeve 423 is provided with a plurality of grooves 4231 connected with the boss structures 4241. The circumferential wall of the rotating sleeve 423 is provided with a coupling protrusion 4232, and the circumferential wall of the rotating handle 424 is provided with a coupling hole 4242 coupled with the coupling protrusion 4232. With this arrangement, the user rotates the rotation handle 424, so that the rotation handle 424 drives the rotation sleeve 423 to rotate synchronously through the connection between the boss structures 4241 and the grooves 4231 and the connection between the connection protrusions 4232 and the connection holes 4242.

In this way, when in specific use, according to the size of the bed to be installed, the sliding sleeve 13 is pushed to move, and then the pipe body 11 is driven to move through the guide piece 14, so that the relative position of the pipe body 11 and the pipe seat 12 is adjusted. When the preset value is reached, the horizontal bracket 1 is horizontally fixed on the bed body. At this time, the main guard rail is in a vertical state, and the two vertical supports 2 are rotated outwards until being in an open state. Then, the rotating handle 424 is rotated downwards, so that the pin 425 moves in the triangular hole 4233, and then one end of the limiting column 421 is driven to slide into the limiting groove 211, so that the first gear 331 and the second gear 21 are fixed, and the position of the side fence is locked. When the height of the main guardrail needs to be adjusted, the outer pipe 31 is moved up and down, and after the outer pipe 31 reaches a proper height, the outer pipe 31 and the inner pipe 32 are fixed by clamping the elastic protrusions 351 in the clamping holes 321.

The above description is only for the purpose of illustrating the technical solutions of the present invention and is not intended to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent processes performed by using the contents of the specification and the drawings of the utility model, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A guardrail is arranged outside a bed body to play a role in protection; the device is characterized by comprising a telescopic horizontal support (1) with two free ends and vertical supporting rods (3) vertically connected to the two free ends respectively, wherein the vertical supporting rods (3) comprise an inner pipe (32) and an outer pipe (31) which can slide relatively; two the both ends of outer tube (31) are equallyd divide and are rotated with vertical support (2) that have two free ends and be connected, two connect through a plurality of horizontal branch poles (4) between outer tube (31).

2. The guardrail according to claim 1, characterized in that the outer tube (31) is provided at its lower end with a first connecting seat (34) and at its upper end with a second connecting seat (33); the peripheral walls of the first connecting seat (34) and the second connecting seat (33) are respectively provided with a first gear (331), and two free ends of the vertical support (2) are respectively provided with a second gear (21) meshed with the first gears (331).

3. The guardrail according to claim 2, wherein the inner pipe (32) is sleeved in the outer pipe (31), the outer pipe (31) slides up and down relative to the inner pipe (32), a plurality of clamping holes (321) are arranged on the peripheral wall of the inner pipe (32) along the axial direction of the inner pipe, a connecting sleeve (35) is sleeved on the outer side of the outer pipe (31), an opening is arranged on the connecting sleeve (35), an elastic bulge (351) with the tail end penetrating through a mounting hole arranged on the peripheral wall of the outer pipe (31) is arranged at the opening, and the elastic bulge (351) is movably connected with the plurality of clamping holes (321); the lower end of the inner pipe (32) penetrates through the first connecting seat (34) and then is connected with the free end of the horizontal support (1).

4. The guardrail according to claim 2, characterized in that opposite sides of the two first connection seats (34) are provided with connection slots (341); slotted holes are formed in the opposite sides of the two second connecting seats (33).

5. The guardrail of claim 4, characterized in that the plurality of transverse struts (4) comprises a first transverse strut (41) with two ends respectively received in the connecting slots (341) and a second transverse strut (42) with two ends respectively passing through the slotted hole and then being connected with the second connecting seat (33).

6. The guardrail according to claim 5, characterized in that two symmetrically arranged limit posts (421) are sleeved in the second transverse strut (42), and the limit posts (421) slide left and right relative to the second transverse strut (42); one end of the limiting column (421) penetrates through the second connecting seat (33) and the first gear (331) and then is accommodated in a limiting groove (211) formed in the second gear (21) so as to limit the relative rotation of the first gear (331) and the second gear (21).

7. The guardrail according to claim 6, characterized in that the peripheral wall of the second transverse strut (42) is symmetrically provided with first bar-shaped through holes (422), one end of the limiting column (421) far away from the limiting groove (211) is provided with a communication hole (4211) corresponding to the first bar-shaped through hole (422), the second transverse strut (42) is sleeved with a rotating sleeve (423) at a position corresponding to the first bar-shaped through hole (422), and the rotating sleeve (423) is provided with triangular holes (4233) at positions corresponding to the two first bar-shaped through holes (422); a pin (425) penetrating through the communication hole (4211), the first strip-shaped through hole (422) and the triangular hole (4233) is arranged in an overlapping area of the communication hole, the first strip-shaped through hole and the triangular hole to drive the limiting column (421) to move back and forth; a rotating handle (424) is sleeved on the outer side of the rotating sleeve (423); a plurality of protruding structures (4241) are arranged on the inner peripheral wall of the rotating handle (424), and a plurality of grooves (4231) connected with the plurality of protruding structures (4241) are arranged on the outer peripheral wall of the rotating sleeve (423); the peripheral wall of the rotating sleeve (423) is provided with a connecting bulge (4232), and the peripheral wall of the rotating handle (424) is provided with a connecting hole (4242) connected with the connecting bulge (4232).

8. The guardrail according to claim 1, characterized in that the horizontal support (1) comprises a tube body (11) in a U-shaped structure and tube seats (12) respectively sleeved in two free ends of the tube body (11), and the lower ends of the inner tubes (32) are connected in mounting grooves arranged on the upper end surface of the tube seats (12).

9. The guardrail according to claim 8, characterized in that the peripheral walls of the free ends of the tube bodies (11) are provided with second strip-shaped through holes (111) penetrating through the tube bodies (11), and the tube seats (12) are provided with third strip-shaped through holes (121) at positions corresponding to the second strip-shaped through holes (111); the outside of the free end sleeve of the pipe body (11) is provided with a sliding sleeve (13), a through hole (131) penetrating through the sliding sleeve (13) is formed in the sliding sleeve (13), and a guide piece (14) sequentially penetrating through the through hole (131), the second strip-shaped through hole (111) and the third strip-shaped through hole (121) is arranged at the through hole (131) to drive the pipe body (11) to move back and forth relative to the pipe seat (12).

10. The guardrail according to claim 2, characterized in that the first gear (331) and the second gear (21) are provided with connecting plates (22) on both upper and lower sides, and coaxial holes are provided on the connecting plates (22) corresponding to the rotation axes of the first gear (331) and the second gear (21).

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