Handrail rod assembly for evacuation ramp

Abstract

The utility model discloses a grab rail assembly for an evacuation ramp, which comprises a grab rail, a supporting rod hinged to a grab rail body and used for being rotatably connected with a secondary ramp, and a crank hinged to a supporting rod body through a connecting rod and used for being rotatably connected with the secondary ramp. When the evacuation ramp is unfolded, the first connecting pieces drive the cranks and the connecting rods to be straightened, and the supporting rods are made to be upright. The handrail of the structure can be automatically unfolded along with unfolding of the evacuation ramp and automatically retracted along with folding of the evacuation ramp, extra driving force is not needed, and manual operation is not needed.

Description

Technical Field

[0001] The utility model relates to a railway vehicle safety device, in particular to a handrail assembly for an evacuation ramp. Background Art

[0002] Currently, rail transit train emergency evacuation ramps are equipped with handrails for use on both sides during emergency evacuation. These handrails are made of non-metallic polyester drawstrings. Their advantages are softness, the ability to be manually folded into any shape during retraction, and the lack of rigid interference during release. However, these handrails are unable to withstand lateral forces, which means leaning on them is a risk. During emergency evacuations, crowded ramps can easily lead to falls.

[0003] Patent application CN 111791906 A discloses a multifunctional grab bar mechanism for a locomotive escape system. The mechanism utilizes a horizontal bar as the grab bar, with a damper attached to its top and a gas spring embedded within. When the ramp is deployed, the gas spring and damper activate, raising and opening the grab bar. This solution requires an additional drive device to open the grab bar mechanism. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a handrail assembly for an evacuation ramp, which can be automatically raised and retracted as the evacuation ramp is unfolded.

[0005] Technical solution: The handrail rod assembly for an evacuation ramp described in the utility model includes a handrail rod, the handrail rod body is hinged to a support rod for rotational connection with a secondary ramp, the support rod body is hinged to a crank for rotational connection with the secondary ramp through a connecting rod, and a first connecting piece for connection to the primary ramp is wrapped around one end of the crank away from the connecting rod. When the evacuation ramp is unfolded, the first connecting piece drives the crank and the connecting rod to straighten, so that the support rod stands upright.

[0006] Preferably, the end of the handrail is provided with a second connecting piece for connecting to the tail end of the secondary ramp.

[0007] Preferably, the crank is rotatably connected to the secondary ramp via a cable pulley, and the first connecting member is wound around the cable pulley.

[0008] Preferably, the pulling wheel is provided with a torsion spring for connecting to the secondary ramp. When the evacuation ramp is folded, the torsion spring drives the crank and the connecting rod to bend, causing the support rod to fall over.

[0009] Preferably, a stop shaft for limiting the rotation angle of the connecting rod is provided on the side of the crank.

[0010] Preferably, the handrail bar assembly further comprises a guide wheel for connecting to the secondary ramp and / or the primary ramp, and the second guide wheel guides the direction of the first connecting member.

[0011] Preferably, a rope clamp is provided at the end of the first connecting member.

[0012] Preferably, there are no less than 2 support rods.

[0013] Beneficial effects: Compared with the existing technology, the utility model has the following significant advantages: 1. The handrail of this structure can be automatically unfolded as the evacuation ramp is unfolded, and automatically retracted as the evacuation ramp is folded, without the need for additional driving force or manual operation; 2. The structural principle is simple, the processing and manufacturing are easy, and the entire device occupies very little space; 3. The handrail can bear greater lateral force to ensure evacuation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the overall structure of the handrail assembly;

[0015] Figure 2 This is a schematic diagram of the inner structure of the crank of the handrail assembly;

[0016] Figure 3 This is a schematic diagram of the connection structure of the first link of the handrail assembly;

[0017] Figure 4 This is a schematic diagram of the inner structure of the crank and connecting rod of the handrail assembly;

[0018] Figure 5 This is a schematic diagram of the structure of the handrail assembly in the expanded state;

[0019] Figure 6 This is a structural diagram of the handrail assembly in the folded state. DETAILED DESCRIPTION

[0020] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0021] like Figures 1 to 4 The handrail assembly mainly consists of a handrail 1 and a support rod 2. The handrail 1 and the support rod 2 are hinged. The bottom of the support rod 2 is hinged to the handrail seat 13 via an axis 12. The handrail seat 13 is connected to the longitudinal beam of the secondary ramp 19. There are no less than two support rods 2. The handrail 1, the support rod 2, and the longitudinal beam of the secondary ramp 19 form a parallelogram structure. The support rod 2 rotates around the secondary ramp 19, driving the handrail 1 to approach the secondary ramp, fold, or lift the handrail 1, and the handrail assembly is unfolded. The tail end of the handrail 1 is connected to the rope seat set at the tail end of the secondary ramp 19 via a connector 22.

[0022] The support rod 2 is hinged to the crank 4 through the connecting rod 3: the support rod 2 and the connecting rod 3 are hinged through the shaft 11, and the crank 4 and the connecting rod 3 are hinged through the shaft 11; the crank 4 (the end away from the connecting rod 3) is rotatably connected to the secondary ramp 19, and the rotating connection end of the crank 4 and the secondary ramp 19 is wrapped with a connector 8, which can be a steel rope. The other end of the connector 8 is connected to the primary ramp 20. When the evacuation ramp is unfolded, the primary ramp 20 drives the connector 8 to move, and the connector 8 drives the crank 4 to rotate, and the crank 4 and the connecting rod 3 are straightened, so that the support rod 2 is upright and the handrail assembly is unfolded.

[0023] The inner side of the end of the crank 4 away from the connecting rod 3 (close to the evacuation ramp) is fastened to the pulling wheel 7 as a whole by screws. The pulling wheel 7 is rotatably connected to the secondary ramp 19 through the shaft 14. One end of the connecting piece 8 is connected to the pulling wheel 7 and is wound in the wheel groove of the pulling wheel 7. The other end passes through the rope shaft 6 connected to the longitudinal beam of the primary ramp 20 and is fastened by the chuck 18.

[0024] To prevent the connector 8 from being too tight or too loose, a stop shaft 9 is provided on the inner side of the end of the crank 4 near the connecting rod 3. A recessed portion is provided at the end of the connecting rod 3 to cooperate with the stop shaft 9. When the handrail assembly is in the final raised state, the recessed portion contacts the stop shaft 9. During assembly, the connector 8 can be adjusted to be in a taut state by referring to the stop shaft 9.

[0025] The handrail assembly further includes a guide wheel 5 , which is connected to the secondary ramp and / or the primary ramp for guiding the connecting member 8 .

[0026] like Figure 5 、 6 The evacuation ramp mainly consists of a primary ramp 20 and a secondary ramp 19. The primary ramp 20 and the secondary ramp 19 have similar structures, both of which are based on rectangular frames. The rectangular frames of the primary ramp 20 and the secondary ramp 19 are connected together by a hinge shaft 21. After the handrail assembly is assembled with the evacuation ramp, when the evacuation ramp is deployed, the primary ramp 20 and the secondary ramp 19 rotate around the hinge shaft 21, and the angle between the primary ramp and the secondary ramp increases. The primary ramp 20 drives the pulley 7 to rotate through the connecting member 8, and then drives the crank 4 and the connecting rod 3 to rotate, so that the crank 4 and the connecting rod 3 are straightened and the handrail rises.

[0027] When the evacuation ramp is folded, the first-level ramp 20 and the second-level ramp 19 rotate around the hinge shaft 20, the angle between the first-level ramp and the second-level ramp decreases, the bottom surfaces approach each other, the pulling wheel 7 is driven to reset by the torsion spring 15, the connecting member 8 is wrapped around the pulling wheel 7, the crank 4 and the connecting rod 3 are bent, the support rod falls over, and the handrail is recovered.

Claims

1. A handrail assembly for an evacuation ramp, comprising a handrail (1), characterized in that: The armrest rod (1) is hinged to a support rod (2) for rotational connection with the secondary ramp; the support rod (2) is hinged to a crank (4) for rotational connection with the secondary ramp via a connecting rod (3); a first connecting member (8) for connection with the primary ramp is wound around one end of the crank (4) away from the connecting rod; when the evacuation ramp is unfolded, the first connecting member (8) drives the crank (4) and the connecting rod (3) to straighten, thereby making the support rod (2) stand upright.

2. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: The end of the handrail (1) is provided with a second connecting piece (22) for connecting to the tail end of the secondary ramp.

3. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: The crank (4) is rotatably connected to the secondary ramp via a cable pulley (7), and the first connecting member (8) is wound around the cable pulley.

4. The handrail assembly for an evacuation ramp according to claim 3, characterized in that: The pulling wheel (7) is provided with a torsion spring (15) for connecting with the secondary ramp. When the evacuation ramp is folded, the torsion spring (15) drives the crank (4) and the connecting rod (3) to bend, causing the support rod to fall over.

5. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: A stop shaft (9) for limiting the rotation angle of the connecting rod (3) is provided on the side of the crank (4).

6. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: The handrail assembly further comprises a guide wheel (5) for connecting to the secondary ramp and / or the primary ramp, and the second guide wheel guides the direction of the first connecting member (8).

7. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: A rope clamp (18) is provided at the end of the first connecting member (8).

8. The handrail assembly for an evacuation ramp according to claim 1, characterized in that: There are no less than 2 support rods (2).

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