Car top guardrail

Abstract

The present invention discloses a car top guardrail. The lower cross bar of the handrail guardrail frame is detachably fixed to the upper cross bar of the middle guardrail frame; the bottom guardrail frame is fixedly connected to the left and right columns of the middle guardrail frame so as to be movable up and down relative to each other. When the bottom guardrail frame moves downward relative to the left and right columns of the middle guardrail frame to the lower limit position, the bottom guardrail frame is vertically locked with the middle guardrail frame, prohibiting the bottom guardrail frame from moving up and down relative to the left and right columns of the middle guardrail frame, and the car top guardrail enters the stretched state; when the bottom guardrail frame moves upward relative to the left and right columns of the middle guardrail frame to the upper limit position, the car top guardrail enters the stored state. The car top guardrail of the present invention can save the space layout of the car top while improving the safety and convenience of the car top operation for maintenance and rescue personnel.

Description

Technical Field

[0001] The present invention relates to elevator equipment, and particularly to a car top guardrail. Background Art

[0002] As a common car component and also a safety component required by regulations, the car top guardrail is an essential safety component. As a safety component on the car top, the car top guardrail should not only ensure the safe and legal working conditions of the operators, but also consider the rational utilization of the top space. While ensuring the rationality of the working space for the operators on the car top, it must protect the safety of the operators, and balance the safety of the operators and the convenience of maintenance and operation.

[0003] Common car top guardrails are single fixed guardrails, and some existing telescopic guardrails or folding guardrails lack composite functionality and have insufficient rationality in use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a car top guardrail that can save the car top space layout while improving the safety and convenience of the maintenance and rescue personnel when operating on the car top.

[0005] To solve the above technical problem, the car top guardrail provided by the present invention includes an armrest guardrail frame 1, a middle guardrail frame 2 and a bottom guardrail frame 3;

[0006] The armrest guardrail frame 1 includes an upper cross bar and a lower cross bar fixed together;

[0007] The middle guardrail frame 2 includes an upper cross bar and a left upright post 21 and a right upright post 22 vertically fixed to the lower side of the upper cross bar;

[0008] The bottom guardrail frame 3 includes an upper cross bar and a left support post 31 and a right support post 32 vertically fixed to both ends of the upper cross bar;

[0009] The lower ends of the left support post 31 and the right support post 32 of the bottom guardrail frame 3 are used to be fixed to the car top;

[0010] The lower cross bar of the armrest guardrail frame 1 is detachably fixed to the upper cross bar of the middle guardrail frame 2;

[0011] The bottom guardrail frame 3 is fixedly connected to the left upright post 21 and the right upright post 22 of the middle guardrail frame 2 so as to be movable up and down relative to each other;

[0012] When the bottom guardrail frame 3 moves downward relative to the left upright post 21 and the right upright post 22 of the middle guardrail frame 2 to the lower limit position, the bottom guardrail frame 3 is vertically locked with the middle guardrail frame 2, and the relative up and down movement of the bottom guardrail frame 3 and the left upright post 21 and the right upright post 22 of the middle guardrail frame 2 is prohibited, and the car top guardrail enters the stretched state;

[0013] When the bottom guardrail frame 3 moves upward to the upper limit position relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2, the car top guardrail enters the storage state.

[0014] Preferably, the car top guardrail further includes a safety switch 52;

[0015] The safety switch 52 is fixedly arranged on the bottom guardrail frame 3;

[0016] When the bottom guardrail frame 3 moves upward to the upper limit position relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2, the safety switch 52 is turned on;

[0017] When the bottom guardrail frame 3 moves downward away from the upper limit position relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2, the safety switch 52 can be turned off.

[0018] Preferably, the car top guardrail further includes a linkage mounting member 4, a switch latch member 53, and a long bolt 55;

[0019] The bottom guardrail frame 3 further includes a switch fixing column 36 and a latch fixing upright column 37;

[0020] The switch fixing column 36 and the latch fixing upright column 37 are vertically and adjacently fixed to the upper cross bar of the bottom guardrail frame 3;

[0021] The switch fixing column 36 and the latch fixing upright column 37 are located between the left support column 31 and the right support column 32;

[0022] The safety switch 52 is fixed to the switch fixing column 36;

[0023] The switch latch member 53 is fixedly connected with a latch piece;

[0024] The switch latch member 53 is movably fixed to the latch fixing upright column 37 up and down;

[0025] The part of the upper cross bar of the bottom guardrail frame 3 between the switch fixing column 36 and the latch fixing upright column 37 forms a trigger through hole with internal threads or a nut welded to the lower side;

[0026] The lower cross bar of the handrail guardrail frame 1 is formed with a communication hole;

[0027] The linkage mounting member 4, its rear part is detachably fixed to the upper cross bar of the middle guardrail frame 2, and its front part is formed with a linkage through hole 41;

[0028] When the bottom guardrail frame 3 is in the upper stop position, rotate the long bolt 55 so that the long bolt 55 passes through the linkage through-hole 41 of the linkage mounting member 4, the communication hole of the handrail guardrail frame 1, and the trigger through-hole with internal threads or welded nuts, and detachably fix the lower crossbar of the handrail guardrail frame 1 to the upper crossbar of the bottom guardrail frame 3. And the lower end of the long bolt 55 abuts and presses down the switch latch member 53, so that the insertion piece is inserted into the safety switch 52, and the safety switch 52 is turned on, and the car top guardrail enters the storage state;

[0029] When the bottom guardrail frame 3 moves downward away from the upper stop position relative to the left column 21 and the right column 22 of the middle guardrail frame 2, the lower end of the long bolt 55 disengages from the switch latch member 53, so that the switch latch member 53 can move upward to pull out the insertion piece from the safety switch 52, and the safety switch 52 can be switched to the off state.

[0030] Preferably, the lower crossbar of the handrail guardrail frame 1 is n-shaped, and the communication hole is formed in the bottom plate of the lower crossbar;

[0031] When the bottom guardrail frame 3 is in the upper stop position, the upper crossbar of the bottom guardrail frame 3 extends into the space between the front and rear side plates of the n-shaped lower crossbar of the handrail guardrail frame 1 from below.

[0032] Preferably, the rear part of the linkage mounting member 4 is fixed to the upper crossbar of the middle guardrail frame 2 by bolts.

[0033] Preferably, the car top guardrail further includes a latch mounting member 51;

[0034] The latch mounting member 51 is fixed to the latch fixing column 37;

[0035] The latch mounting member 51 is u-shaped, and a guiding and positioning groove is formed on its side wall;

[0036] The switch latch member 53 is n-shaped, and is axially vertically buckled with the latch mounting member 51, and its side wall enters the guiding and positioning groove on the side wall of the latch mounting member 51, so that the switch latch member 53 is fixed to the latch fixing column 37 in a vertically movable manner;

[0037] A spiral spring 54 is fixedly arranged on the bottom plate of the latch mounting member 51;

[0038] When the bottom guardrail frame 3 is in the upper stop position, rotate the long bolt 55 so that the long bolt 55 passes through the linkage through-hole 41 of the linkage mounting member 4, the communication hole of the handrail guardrail frame 1, and the trigger through-hole with internal threads or welded nuts, detachably fix the lower crossbar of the handrail guardrail frame 1 and the upper crossbar of the bottom guardrail frame 3 together, and the lower end of the long bolt 55 abuts against and presses down the bottom plate of the switch latch member 53. The switch latch member 53 moves downward to compress and deform the helical spring 54, and the insert piece is inserted into the safety switch 52, so that the safety switch 52 is turned on and the car top guardrail enters the storage state;

[0039] When the bottom guardrail frame 3 moves downward away from the upper stop position relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2, the lower end of the long bolt 55 disengages from the switch latch member 53. The compression deformation force of the helical spring 54 causes the switch latch member 53 to move upward, and the insert piece is automatically pulled out of the safety switch 52, so that the safety switch 52 is automatically switched to the off state.

[0040] Preferably, guide posts 25 are respectively formed on the front sides of the lower ends of the left upright column 21 and the right upright column 22 of the middle guardrail frame 2;

[0041] Vertical guide grooves 33 are respectively formed on the left support column 31 and the right support column 32 of the bottom guardrail frame 3;

[0042] The guide posts 25 on the front sides of the lower ends of the left upright column 21 and the right upright column 22 are respectively inserted into the vertical guide grooves 33 of the left support column 31 and the right support column 32, so that the middle guardrail frame 2 and the bottom guardrail frame 3 are fixedly connected together and can move up and down relative to each other.

[0043] Preferably, the car top guardrail further includes an unlocking pull rod 6 and a torsion spring 72;

[0044] The unlocking pull rod 6 includes a limit rod 61 and a connecting rod 62;

[0045] The upper end of the connecting rod 62 is vertically and fixedly connected to the middle of the limit rod 61, and a torsion hole with an axis perpendicular to the connecting rod 62 and the limit rod 61 is formed at the lower end;

[0046] A limit hole 26 is formed on the front side of the lower end of the left upright column 21 or the right upright column 22 of the middle guardrail frame 2;

[0047] A torsion spring shaft 35 with a left-right direction axis is fixedly formed on the left side of the left support column 31 or the right side of the right support column 32 of the bottom guardrail frame 3;

[0048] The torsion spring 72 is sleeved on the torsion spring shaft 35, one end of which is fixedly installed on the left side of the left support column 31 or / and the right support column 32, and the other end is clamped to the lower part of the connecting rod 62, applying a torsional force for the connecting rod 62 to rotate backward;

[0049] When the bottom guardrail frame 3 moves downward relative to the left and right columns 21 and 22 of the middle guardrail frame 2 to the lower limit position, the torsional force of the torsion spring 72 causes the connecting rod 62 to rotate backward, driving the limit rod 61 to move backward so that the rear end of the limit rod 61 is inserted into the limit hole 26, thereby vertically locking the bottom guardrail frame 3 to the middle guardrail frame 2 and prohibiting the relative vertical movement between the bottom guardrail frame 3 and the left and right columns 21 and 22 of the middle guardrail frame 2.

[0050] For the car top guardrail of the present invention, the handrail guardrail frame 1, the middle guardrail frame 2 and the bottom guardrail frame 3 are detachable, and the middle guardrail frame 2 and the bottom guardrail frame 3 can telescopically move relative to each other in the vertical direction. One, two, three or four car top guardrails can be installed on the car top. When the elevator needs to be rescued or maintained, the car top guardrail can be stretched and used. When the elevator is in normal use, the car top guardrail is restored to the stored state, saving the car top space layout while improving the safety and convenience of the maintenance and rescue personnel's operations on the car top. Brief Description of the Drawings

[0051] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the present invention will be briefly introduced below. Obviously, the drawings in the following description are only 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 efforts.

[0052] Figure 1 It is a schematic structural diagram of an embodiment of the car top guardrail of the present invention in the stretched state;

[0053] Figure 2 It is a schematic structural diagram of an embodiment of the car top guardrail of the present invention in the stored state;

[0054] Figure 3 It is Figure 2 The enlarged schematic diagram at A in

[0055] Figure 4 It is Figure 1 The enlarged schematic diagram at B in

[0056] The reference numerals are explained as follows:

[0057] 1 Handrail guardrail; 2 Middle guardrail; 21 Left column; 22 Right column; 25 Guide column; 26 Limit hole; 3 Bottom guardrail; 31 Left support column; 32 Right support column; 33 Guide groove; 35 Torsion spring shaft; 36 Switch fixing column; 37 Bolt fixing column; 4 Linkage mounting; 41 Linkage through hole; 51 Bolt mounting; 52 Safety switch; 53 Switch bolt; 54 Helical spring; 55 Long bolt; 6 Unlock pull rod; 61 Limit rod; 62 Connecting rod; 72 Torsion spring. Detailed implementation

[0058] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0059] Embodiment 1, as Figure 1 、 Figure 2 shown, the car top guardrail includes a handrail guardrail 1, a middle guardrail 2 and a bottom guardrail 3;

[0060] The handrail guardrail 1 includes an upper cross bar and a lower cross bar fixed together;

[0061] The middle guardrail 2 includes an upper cross bar and a left column 21 and a right column 22 vertically fixed to the lower side of the upper cross bar;

[0062] The bottom guardrail 3 includes an upper cross bar and a left support column 31 and a right support column 32 vertically fixed to both ends of the upper cross bar;

[0063] The lower ends of the left support column 31 and the right support column 32 of the bottom guardrail 3 are used to be fixed to the car top;

[0064] The lower cross bar of the handrail guardrail 1 is detachably fixed to the upper cross bar of the middle guardrail 2;

[0065] The bottom guardrail 3 is fixedly connected to the left column 21 and the right column 22 of the middle guardrail 2 so as to be movable up and down relative to each other;

[0066] When the bottom guardrail 3 moves downward relative to the left column 21 and the right column 22 of the middle guardrail 2 to the lower limit position, the bottom guardrail 3 is vertically locked with the middle guardrail 2, prohibiting the bottom guardrail 3 from moving up and down relative to the left column 21 and the right column 22 of the middle guardrail 2, and the car top guardrail enters the stretched state, as Figure 1 shown;

[0067] When the bottom guardrail frame 3 moves upward relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2 to the upper stop position, the car top guardrail enters the storage state, as Figure 2 shown.

[0068] For the car top guardrail of the first embodiment, the handrail guardrail frame 1, the middle guardrail frame 2 and the bottom guardrail frame 3 are detachable, and the middle guardrail frame 2 and the bottom guardrail frame 3 can telescopically move relative to each other in the up and down directions. One, two, three or four car top guardrails can be installed on the car top. When the elevator needs to be rescued or maintained, the car top guardrail can be stretched and used. When the elevator is in normal use, the car top guardrail is restored to the storage state. While saving the space layout of the car top, it can also improve the safety and convenience of the car top operation for maintenance and rescue personnel, and is particularly suitable for being configured on the car top of elevators with special functional requirements for fire escalators and rescue and maintenance.

[0069] In the second embodiment, based on the first embodiment, the car top guardrail further includes a safety switch 52;

[0070] The safety switch 52 is fixedly arranged on the bottom guardrail frame 3;

[0071] When the bottom guardrail frame 3 moves upward relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2 to the upper stop position, the safety switch 52 is turned on;

[0072] When the bottom guardrail frame 3 moves downward relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2 and leaves the upper stop position, the safety switch 52 can be turned off.

[0073] For the car top guardrail of the second embodiment, when the bottom guardrail frame 3 is in the upper stop position, the safety switch 52 can be turned on, and the car top guardrail is in the storage state; by lifting the handrail guardrail frame 1 or the middle guardrail frame 2, the bottom guardrail frame 3 moves downward relative to the left upright column 21 and the right upright column 22 of the middle guardrail frame 2 and leaves the upper stop position, and the safety switch 52 is turned off again, so that the car top guardrail enters the stretched state.

[0074] In the third embodiment, based on the second embodiment, as Figure 3 shown, the car top guardrail further includes a linkage mounting member 4, a switch plug member 53, and a long bolt 55;

[0075] The bottom guardrail frame 3 further includes a switch fixing column 36 and a plug fixing upright column 37;

[0076] The switch fixing column 36 and the plug fixing upright column 37 are vertically fixed adjacent to the upper cross bar of the bottom guardrail frame 3;

[0077] The switch fixing column 36 and the plug fixing upright column 37 are located between the left support column 31 and the right support column 32;

[0078] The safety switch 52 is fixed to the switch fixing post 36;

[0079] The switch latch member 53 is fixedly connected with a tab;

[0080] The switch latch member 53 is fixedly mounted on the latch fixing upright post 37 so as to be movable up and down;

[0081] The upper cross bar of the bottom guardrail frame 3 between the switch fixing post 36 and the latch fixing upright post 37 forms a trigger through hole having internal threads or a nut welded to the lower side;

[0082] The lower cross bar of the handrail guardrail frame 1 is formed with a communication hole;

[0083] The linkage mounting member 4, the rear part of which is detachably fixed to the upper cross bar of the middle guardrail frame 2, is formed with a linkage through hole 41 at the front part thereof;

[0084] When the bottom guardrail frame 3 is at the upper dead position, rotate the long bolt 55 to make the long bolt 55 pass through the linkage through hole 41 of the linkage mounting member 4, the communication hole of the handrail guardrail frame 1 and the trigger through hole having internal threads or welded with a nut, detachably fix the lower cross bar of the handrail guardrail frame 1 and the upper cross bar of the bottom guardrail frame 3 together, and the lower end of the long bolt 55 abuts against and presses down the switch latch member 53 to make the tab insert into the safety switch 52 to turn on the safety switch 52, and the car top guardrail enters the storage state;

[0085] When the bottom guardrail frame 3 moves downward away from the upper dead position relative to the left upright post 21 and the right upright post 22 of the middle guardrail frame 2, the lower end of the long bolt 55 disengages from the switch latch member 53, enabling the switch latch member 53 to move upward to pull out the tab from the safety switch 52, so that the safety switch 52 can be switched to the off state.

[0086] Preferably, the lower cross bar of the handrail guardrail frame 1 is in an n shape, and the communication hole is formed in the bottom plate of the lower cross bar;

[0087] When the bottom guardrail frame 3 is at the upper dead position, the upper cross bar of the bottom guardrail frame 3 extends into the space between the front and rear side plates of the n-shaped lower cross bar of the handrail guardrail frame 1 from the lower side.

[0088] Preferably, the rear part of the linkage mounting member 4 is fixed to the upper cross bar of the middle guardrail frame 2 by bolts.

[0089] The car top guardrail of Embodiment 3, the handrail guardrail frame 1, the middle guardrail frame 2 and the bottom guardrail frame 3 are detachably installed and fixed together through the linkage installation part 4; during elevator maintenance or emergency rescue, when the operator needs to use the (fire) guardrail, since the linkage installation part 4 and the long bolt 55 not only realize the connection of the handrail guardrail frame 1 and the bottom guardrail frame 3, but also limit the disconnection or connection of the safety switch 52, so by unlocking the connection of the handrail guardrail frame 1 and the bottom guardrail frame 3, the safety switch 52 can be disconnected while disconnecting the safety circuit, and at the same time, the car top guardrail can be stretched and used to meet the regulatory requirements and ensure the safety of maintenance and rescue personnel.

[0090] Embodiment 4, based on Embodiment 3, as Figure 3 shown, the car top guardrail further includes a bolt installation part 51;

[0091] The bolt installation part 51 is fixed on the bolt fixing column 37;

[0092] The bolt installation part 51 is U-shaped, and its side wall is formed with a guiding and positioning groove;

[0093] The switch bolt part 53 is N-shaped, and it is vertically buckled with the bolt installation part 51 axially. Its side wall enters the guiding and positioning groove on the side wall of the bolt installation part 51, so that the switch bolt part 53 can be fixed on the bolt fixing column 37 in a vertically movable manner;

[0094] A spiral spring 54 is fixedly arranged on the bottom plate of the bolt installation part 51;

[0095] When the bottom guardrail frame 3 is at the upper stop position, rotate the long bolt 55 so that the long bolt 55 passes through the linkage through hole 41 of the linkage installation part 4, the communication hole of the handrail guardrail frame 1 and the trigger through hole with internal threads or welded with nuts, and detachably fix the lower cross bar of the handrail guardrail frame 1 and the upper cross bar of the bottom guardrail frame 3 together. And the lower end of the long bolt 55 abuts and presses down the bottom plate of the switch bolt part 53, the switch bolt part 53 moves downward to compress and deform the spiral spring 54, and the insert piece is inserted into the safety switch 52, so that the safety switch 52 is turned on, and the car top guardrail enters the storage state;

[0096] When the bottom guardrail frame 3 moves downward relative to the left column 21 and the right column 22 of the middle guardrail frame 2 and leaves the upper stop position, the lower end of the long bolt 55 disengages from the switch bolt part 53, and the compression deformation force of the spiral spring 54 causes the switch bolt part 53 to move upward, and the insert piece is automatically pulled out of the safety switch 52, so that the safety switch 52 is automatically switched to the off state.

[0097] The car top guardrail of the fourth embodiment. The spiral spring 54 can be used to prevent the switch latch member 53 from moving down too much, causing the insertion piece to be inserted too deeply into the safety switch 52 and damaging the safety switch 52. Also, during the unfolding process of the car top guardrail, through the compressive deformation force of the spiral spring 54, the switch latch member 53 can be quickly lifted, causing the insertion piece to automatically pull out from the safety switch 52, automatically switching the safety switch 52 to the off state, and ensuring the safety of maintenance personnel in the elevator.

[0098] In the stored state, the long bolt 55 is fixed to the handrail guardrail frame 1, the bottom guardrail frame 3, and the linkage mounting member 4. The lower end of the long bolt 55 abuts against the switch latch member 53, ensuring that the insertion piece is inserted into the safety switch 52, and keeping the safety switch 52 closed. When the elevator needs to use the car top guardrail for maintenance and rescue (fire fighting), first rotate and move up the long bolt 55 on the linkage mounting member 4. After the long bolt 55 moves up, the switch latch member 53 will be lifted by the spiral spring 54, automatically switching the safety switch 52 to the off state and disconnecting the safety circuit. Then, the switch latch member 53 can be manually removed and placed temporarily to ensure that the safety circuit is disconnected during maintenance.

[0099] Embodiment Five, based on the car top guardrail of Embodiment Three, as Figure 4 shown, at the front sides of the lower ends of the left upright column 21 and the right upright column 22 of the middle guardrail frame 2, guiding columns 25 are respectively formed;

[0100] At the left support column 31 and the right support column 32 of the bottom guardrail frame 3, vertical guiding grooves 33 are respectively formed;

[0101] The guiding columns 25 at the front sides of the lower ends of the left upright column 21 and the right upright column 22 are respectively inserted into the vertical guiding grooves 33 of the left support column 31 and the right support column 32, so that the middle guardrail frame 2 and the bottom guardrail frame 3 are fixedly connected together and can move relatively up and down.

[0102] Embodiment Six, based on Embodiment Five, as Figure 4 shown, the car top guardrail further includes an unlocking pull rod 6 and a torsion spring 72;

[0103] The unlocking pull rod 6 includes a limiting rod 61 and a connecting rod 62;

[0104] The upper end of the connecting rod 62 is vertically and fixedly connected to the middle part of the limiting rod 61, and a torsion hole with an axis perpendicular to the connecting rod 62 and the limiting rod 61 is formed at the lower end;

[0105] At the front side of the lower end of the left upright column 21 or the right upright column 22 of the middle guardrail frame 2, a limiting hole 26 is formed;

[0106] On the left side of the left support column 31 or on the right side of the right support column 32 of the bottom guardrail frame 3, a torsion spring shaft 35 with a left - right axis is fixedly formed;

[0107] The torsion spring 72 is sleeved on the torsion spring shaft 35. One end of the torsion spring 72 is fixedly installed on the left side of the left support column 31 or and the right support column 32, and the other end is clamped to the lower part of the connecting rod 62, applying a torsional force for the connecting rod 62 to rotate backward.

[0108] When the bottom guardrail frame 3 moves downward relative to the left and right columns 21 and 22 of the middle guardrail frame 2 to the lower limit position, the torsional force of the torsion spring 72 causes the connecting rod 62 to rotate backward, driving the limit rod 61 to move backward so that the rear end of the limit rod 61 is inserted into the limit hole 26, thereby vertically locking the bottom guardrail frame 3 and the middle guardrail frame 2 and prohibiting the relative vertical movement between the bottom guardrail frame 3 and the left and right columns 21 and 22 of the middle guardrail frame 2.

[0109] For the car top guardrail of the sixth embodiment, when the elevator needs to use the car top guardrail for maintenance and rescue (fire fighting), first remove the long bolt 55 on the linkage mounting member 4. After the long bolt 55 is removed, the switch latch member 53 will be pushed up by the helical spring 54, automatically switching the safety switch 52 to the off state and disconnecting the safety circuit. After the safety circuit is disconnected, lift the handrail guardrail frame 1. Through the linkage mounting member 4, the middle guardrail frame 2 is driven to extend upward during the lifting process until the middle guardrail frame 2 and the bottom guardrail frame 3 are fully extended. The torsion spring 72 causes the unlocking pull rod 6 to rotate backward by itself, making the rear end of the limit rod 61 inserted into the limit hole 26, realizing the up and down direction limit of the car top guardrail and completing the stretching use of the car top guardrail. When the car top guardrail is no longer in use and needs to be restored, pull the unlocking link 6 forward to release the up and down direction limit of the car top guardrail. By lowering the handrail guardrail frame 1, the middle guardrail frame 2 is driven to move downward until the handrail guardrail frame 1 and the bottom guardrail frame 3 are installed and matched through the linkage mounting member 4, and then tighten the long bolt 55 again for storage and fixation. Before the long bolt 55 is fully tightened, pre-insert the lower end of the insert piece fixed to the switch latch member 53 into the safety switch 52 again. Finally, tighten the long bolt 55 to press down the switch latch member 53, making the main body of the insert piece inserted into the safety switch 52, keeping the safety switch 52 closed, and completing the storage and restoration of the car top guardrail.

[0110] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A car top guardrail, characterized in that, it includes an armrest guardrail frame (1), a middle guardrail frame (2), a bottom guardrail frame (3), a linkage mounting member (4), a switch plug member (53), a safety switch (52) and a long bolt (55); The armrest guardrail frame (1) includes an upper crossbar and a lower crossbar fixed together; The middle guardrail frame (2) includes an upper crossbar and a left upright column (21) and a right upright column (22) vertically fixed to the lower side of the upper crossbar; The bottom guardrail frame (3) includes a switch fixing column (36), a plug fixing upright column (37), an upper crossbar and a left support column (31) and a right support column (32) vertically fixed to both ends of the upper crossbar; The lower ends of the left support column (31) and the right support column (32) of the bottom guardrail frame (3) are used to be fixed to the car top; The lower crossbar of the armrest guardrail frame (1) is detachably fixed to the upper crossbar of the middle guardrail frame (2); The bottom guardrail frame (3) is fixed to the left upright column (21) and the right upright column (22) of the middle guardrail frame (2) so as to be movable up and down relative to each other; The switch fixing column (36) and the plug fixing upright column (37) are vertically fixed adjacent to the upper crossbar of the bottom guardrail frame (3); The switch fixing column (36) and the plug fixing upright column (37) are located between the left support column (31) and the right support column (32); The safety switch (52) is fixed to the switch fixing column (36); The switch plug member (53) is fixedly connected with a plug piece; The switch plug member (53) is movably fixed to the plug fixing upright column (37) up and down; The part of the upper crossbar of the bottom guardrail frame (3) located between the switch fixing column (36) and the plug fixing upright column (37) forms a trigger through hole with internal threads or a nut welded to the lower side; The lower crossbar of the armrest guardrail frame (1) is formed with a communication hole; The lower crossbar of the armrest guardrail frame (1) is in an n shape, and the communication hole is formed on the bottom plate of the lower crossbar; When the bottom guardrail frame (3) is in the upper stop position, the upper crossbar of the bottom guardrail frame (3) extends into the space between the front and rear side plates of the n-shaped lower crossbar of the armrest guardrail frame (1) from the lower side; The linkage mounting member (4), its rear part is detachably fixed to the upper crossbar of the middle guardrail frame (2) by bolts, and its front part is formed with a linkage through hole (41); When the bottom guardrail frame (3) is in the upper stop position, rotate the long bolt (55), so that the long bolt (55) passes through the linkage through hole (41) of the linkage mounting member (4), the communication hole of the armrest guardrail frame (1) and the trigger through hole with internal threads or welded with a nut, detachably fix the lower crossbar of the armrest guardrail frame (1) and the upper crossbar of the bottom guardrail frame (3) together, and the lower end of the long bolt (55) abuts against and presses down the switch plug member (53), so that the plug piece is inserted into the safety switch (52), making the safety switch (52) turned on, and the car top guardrail enters the storage state; When the bottom guardrail frame (3) moves downward away from the upper stop position relative to the left upright post (21) and the right upright post (22) of the middle guardrail frame (2), the lower end of the long bolt (55) disengages from the switch latch member (53), enabling the switch latch member (53) to move upward to pull out the insert piece from the safety switch (52), thereby enabling the safety switch (52) to switch to the off state; When the bottom guardrail frame (3) moves downward to the lower stop position relative to the left upright post (21) and the right upright post (22) of the middle guardrail frame (2), the bottom guardrail frame (3) is vertically locked with the middle guardrail frame (2), prohibiting the bottom guardrail frame (3) from moving up and down relative to the left upright post (21) and the right upright post (22) of the middle guardrail frame (2), and the car top guardrail enters the stretched state.

2. The car top guardrail according to claim 1, characterized in that, the car top guardrail further includes a latch mounting member (51); the latch mounting member (51) is fixed to the latch fixing upright post (37); the latch mounting member (51) is U-shaped, and its side wall is formed with a guiding and positioning groove; the switch latch member (53) is N-shaped, and it is axially vertically buckled with the latch mounting member (51), and its side wall enters the guiding and positioning groove on the side wall of the latch mounting member (51), so that the switch latch member (53) is fixed to the latch fixing upright post (37) and can move up and down; a spiral spring (54) is fixedly arranged on the bottom plate of the latch mounting member (51); When the bottom guardrail frame (3) is at the upper stop position, rotate the long bolt (55) so that the long bolt (55) passes through the linkage through hole (41) of the linkage mounting member (4), the communication hole of the handrail guardrail frame (1), and the trigger through hole with internal threads or welded with nuts, detachably fixing the lower cross bar of the handrail guardrail frame (1) to the upper cross bar of the bottom guardrail frame (3), and the lower end of the long bolt (55) abuts against and presses down the bottom plate of the switch latch member (53), the switch latch member (53) moves downward to compress and deform the spiral spring (54), and the insert piece is inserted into the safety switch (52), thereby turning on the safety switch (52), and the car top guardrail enters the retracted state; When the bottom guardrail frame (3) moves downward away from the upper stop position relative to the left upright post (21) and the right upright post (22) of the middle guardrail frame (2), the lower end of the long bolt (55) disengages from the switch latch member (53), and the compression deformation force of the spiral spring (54) causes the switch latch member (53) to move upward, and the insert piece is automatically pulled out from the safety switch (52), automatically switching the safety switch (52) to the off state.

3. The car top guardrail according to claim 1, characterized in that, guide posts (25) are respectively formed on the front sides at the lower ends of the left upright post (21) and the right upright post (22) of the middle guardrail frame (2); vertical guiding grooves (33) are respectively formed on the left support post (31) and the right support post (32) of the bottom guardrail frame (3); The guide posts (25) on the front sides at the lower ends of the left upright post (21) and the right upright post (22) are respectively inserted into the vertical guide grooves (33) of the left support post (31) and the right support post (32), so that the middle guardrail frame (2) and the bottom guardrail frame (3) are fixedly connected together and can move relatively up and down.

4. The car top guardrail according to claim 3, characterized in that the car top guardrail further comprises an unlocking pull rod (6) and a torsion spring (72); the unlocking pull rod (6) comprises a limit rod (61) and a connecting rod (62); the upper end of the connecting rod (62) is vertically and fixedly connected to the middle part of the limit rod (61), and a torsion hole with an axis perpendicular to the connecting rod (62) and the limit rod (61) is formed at the lower end; a limit hole (26) is formed on the front side at the lower end of the left upright post (21) or the right upright post (22) of the middle guardrail frame (2); a torsion spring shaft 35 with a left-right direction axis is fixedly formed on the left side of the left support post (31) or on the right side of the right support post (32) of the bottom guardrail frame (3); the torsion spring (72) is sleeved on the torsion spring shaft 35, one end of which is fixedly installed on the left side of the left support post (31) or on the right side of the right support post (32), and the other end of which is clamped to the lower part of the connecting rod (62), applying a torsional force for backward rotation to the connecting rod (62); when the bottom guardrail frame (3) moves downward relative to the left upright post (21) and the right upright post (22) of the middle guardrail frame (2) to the lower limit position, the torsional force of the torsion spring (72) causes the connecting rod (62) to rotate backward, driving the limit rod (61) to move backward so that the rear end of the limit rod (61) is inserted into the limit hole (26), thereby vertically locking the bottom guardrail frame (3) and the middle guardrail frame (2), and prohibiting the bottom guardrail frame (3) from moving relatively up and down with the left upright post (21) and the right upright post (22) of the middle guardrail frame (2).

Images