A retractable structure for the operating armrests of an evacuation chair

Abstract

This utility model discloses a retractable armrest structure for an evacuation chair, comprising two mounting cylinders. Each mounting cylinder has a groove on its inner side, and a single-sided toothed plate is fixedly installed on the side of each groove. A telescopic sleeve is slidably connected inside each mounting cylinder. Both ends of each telescopic sleeve are through-holes, and a through-groove is formed at the bottom of each telescopic sleeve. A rotating rod is rotatably installed on the inner side of each through-groove, and a rotating gear is fixedly installed on the outer surface of the rotating rod. The rotating gear meshes with the single-sided toothed plate. This retractable armrest structure for an evacuation chair provides a solution that is convenient to adjust, reliable to lock, and highly adaptable. Through innovative mechanical transmission and locking design, it enables rapid extension and retraction adjustment of the armrest, helping operators complete transfer tasks efficiently and safely during emergency evacuations, and safeguarding the lives of people with mobility impairments.

Description

Technical Field

[0001] This utility model relates to the field of evacuation chair technology, specifically to a retractable structure for the operating armrests of an evacuation chair. Background Technology

[0002] An evacuation chair is a specialized device designed for emergency scenarios to assist people with mobility impairments in safely evacuating from multi-story buildings during emergencies such as fires and earthquakes when elevators are unavailable. It typically features a crawler or track system adapted to staircases, safety restraint devices, and operating handles, allowing operators to efficiently and stably transport users along the stairs to a safe area. It is a crucial tool for ensuring the emergency escape rights of all personnel within a building and is commonly found in emergency facilities in multi-story public buildings such as hospitals, shopping malls, and office buildings.

[0003] In the field of medical emergency rescue and evacuation, evacuation chairs are key equipment for transferring people with limited mobility, and the user experience of their operating armrests directly affects evacuation efficiency and the physical exertion of operators. Existing evacuation chair operating armrests generally suffer from problems such as inconvenient adjustment, unstable locking, and insufficient adaptability. Either adjustment requires two hands and the gear shifting is not smooth, or they are prone to loosening and slipping under load, making it difficult to meet the needs of operators of different heights for quick adaptation. Especially in emergency scenarios such as fires and earthquakes, cumbersome adjustment steps can waste valuable rescue time and even increase secondary risks due to structural instability. Utility Model Content

[0004] The purpose of this utility model is to provide a retractable structure for the operating armrests of an evacuation chair to solve the problems mentioned in the background art.

[0005] A retractable armrest structure for an evacuation chair includes two mounting cylinders. Each mounting cylinder has a groove on its inner side. A single-sided toothed plate is fixedly installed on the side of each groove. A telescopic sleeve is slidably connected inside each mounting cylinder. Each telescopic sleeve has through-holes at both ends and a through-groove at its bottom. A rotating rod is rotatably installed on the inner side of each through-groove. A rotating gear is fixedly installed on the outer surface of the rotating rod. The rotating gear meshes with the single-sided toothed plate. A double-sided toothed plate is meshed with the rotating gear and located inside the telescopic sleeve. A second telescopic sleeve is fixedly installed at the upper end of each double-sided toothed plate. A self-locking structure is provided on the outer surface of both telescopic sleeves.

[0006] Preferably, there are two of each of the first groove, the single-sided toothed plate, the through groove, the first rotating rod, and the rotating gear, and the two first grooves, the single-sided toothed plate, the through groove, the first rotating rod, and the rotating gear are arranged symmetrically.

[0007] Preferably, each of the self-locking structures includes a fixed sleeve, which is fixedly installed on the outer surface of the telescopic sleeve one. Two fixed plates are fixedly installed on the outer surface of the fixed sleeve. Rotating rods two are rotatably installed on opposite sides of the two fixed plates. Rotating plates are fixedly installed on the outer surface of the rotating rods two. A locking rod is fixedly installed at one end of the rotating plate. An elastic element is fixedly installed at the bottom of the other end of the rotating plate. The bottom end of the elastic element is fixedly installed on the outer surface of the fixed sleeve. Multiple locking holes are vertically and equidistantly arranged on the outer surface of the telescopic sleeve two.

[0008] Preferably, the outer surface of the fixed sleeve is provided with a second groove, and the bottom end of the elastic element is fixedly installed at the inner bottom end of the second groove.

[0009] Preferably, a connecting rod is fixedly installed at the upper end of the two telescopic sleeves 2. The connecting rod 1 has a circular longitudinal section and a hollow interior.

[0010] Preferably, a connecting rod is fixedly installed at the upper end of the two rotating plates, and a limiting plate is fixedly installed at the bottom end of the double-sided toothed plate.

[0011] By adopting the above technical solutions, the handrails can be quickly extended and retracted, helping operators to complete transfer tasks efficiently and safely during emergency evacuations, and safeguarding the lives of people with mobility impairments.

[0012] Compared with the prior art, the beneficial effect of this utility model is that the evacuation chair has a retractable armrest structure. The smooth extension and retraction of the handrails is achieved through the meshing transmission of rotating gears with double-sided and single-sided toothed plates. Operators can quickly adjust the height of the handrails to suit their own height, allowing them to maintain a natural force-applying posture when holding the handrails. In emergency evacuation scenarios, this significantly reduces adjustment time and improves rescue efficiency. The gear and rack transmission in the structure has a self-locking characteristic. Combined with the precise cooperation between components, the handrails can be locked in place by a locking structure after adjustment, preventing the handrails from slipping during evacuation and ensuring the safety of the transfer process. The handrails can be retracted to a compact state, reducing the space occupied by the evacuation chair and facilitating its use in narrow passages or during storage, thus enhancing the adaptability of the equipment in different scenarios. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This utility model Figure 2 A magnified view of A in the middle.

[0014] In the diagram: 1. Mounting sleeve; 2. Telescopic sleeve one; 3. Telescopic sleeve two; 4. Connecting rod one; 5. Through groove; 6. Rotating rod one; 7. Rotating gear; 8. Double-sided toothed plate; 9. Single-sided toothed plate; 10. Groove one; 11. Fixing sleeve; 12. Connecting rod two; 13. Fixing plate; 14. Rotating rod two; 15. Rotating plate; 16. Locking rod; 17. Elastic element; 18. Groove two; 19. Locking hole; 20. Limiting plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] like Figure 1-3 As shown, this utility model provides a technical solution: a telescopic structure for the operating armrest of an evacuation chair, including two mounting cylinders 1. Each mounting cylinder 1 has a groove 10 on its inner side. A single-sided toothed plate 9 is fixedly installed on the side of the groove 10. Telescopic sleeves 2 are slidably connected inside each mounting cylinder 1. Each telescopic sleeve 2 has through-holes at both ends. A through-groove 5 is opened at the bottom of each telescopic sleeve 2. A rotating rod 6 is rotatably installed on the inner side of each through-groove 5. A rotating gear 7 is fixedly installed on the outer surface of the rotating rod 6. The rotating gear 7 meshes with the single-sided toothed plate 9. A double-sided toothed plate 8 meshes with the rotating gear 7. The double-sided toothed plate 8 is located inside the telescopic sleeve 2. A telescopic sleeve 3 is fixedly installed on the upper end of the double-sided toothed plate 8. A self-locking structure is provided on the outer surface of both telescopic sleeves 2.

[0017] In an optional embodiment: two of each of the groove 10, single-sided toothed plate 9, through groove 5, rotating rod 6 and rotating gear 7 are provided, and the two grooves 10, single-sided toothed plate 9, through groove 5, rotating rod 6 and rotating gear 7 are arranged symmetrically.

[0018] It should be noted that simultaneous participation in the transmission allows the force on the telescopic component to be evenly distributed on both sides, avoiding deformation, increased wear, or movement stagnation caused by force on one side. This significantly improves the stability and service life of the structure. The double-sided meshing transmission can effectively counteract the lateral force during the transmission process, making the telescopic movement smoother and more stable. When adjusting the height of the handrail, the operator can feel more uniform resistance, resulting in a better operating experience.

[0019] In an optional embodiment: each self-locking structure includes a fixed sleeve 11, which is fixedly installed on the outer surface of the telescopic sleeve 2. Two fixed plates 13 are fixedly installed on the outer surface of the fixed sleeve 11. Rotating rods 14 are rotatably installed on opposite sides of the two fixed plates 13. Rotating plates 15 are fixedly installed on the outer surface of the rotating rods 14. A locking rod 16 is fixedly installed at one end of the rotating plate 15. An elastic element 17 is fixedly installed at the bottom of the other end of the rotating plate 15. The bottom end of the elastic element 17 is fixedly installed on the outer surface of the fixed sleeve 11. Multiple locking holes 19 arranged vertically and equidistantly are provided on the outer surface of the telescopic sleeve 2.

[0020] It should be noted that the self-locking structure fixes the length of the handrail after it has been extended or retracted.

[0021] In an optional embodiment: a groove 18 is provided on the outer surface of the fixed sleeve 11, and the bottom end of the elastic member 17 is fixedly installed at the bottom end of the inner side of the groove 18.

[0022] It should be noted that this increases the space for the rotating plate 15 to rotate, reducing restrictions.

[0023] In an optional embodiment: a connecting rod 4 is fixedly installed on the upper end of the two telescopic sleeves 2 3. The connecting rod 4 has a circular longitudinal section and a hollow interior.

[0024] It should be noted that the connecting rod 4 serves to connect the two telescopic sleeves 3. Later, simply pulling the connecting rod 4 will control the two telescopic sleeves 3.

[0025] In an optional embodiment, a connecting rod 12 is fixedly installed on the upper end of the two rotating plates 15, and a limiting plate 20 is fixedly installed on the bottom end of the double toothed plates 8.

[0026] It should be noted that by pressing down on the connecting rod 12, a downward pressing force can be applied to one end of both rotating plates 15 at the same time. The function of the limiting plate 20 is to prevent the telescopic sleeve 3 from being pulled out indefinitely.

[0027] In practical use, the working principle of this utility model is as follows: The two mounting cylinders 1 should be installed on the back of the evacuation chair or on the seat bracket. When adjusting, the user holds the connecting rod 1 4 with one hand and presses down on the connecting rod 2 12 with the other hand. When the connecting rod 2 12 is pressed down, it creates downward pressure on one end of the two rotating plates 15, causing the rotating plates 15 to rotate to one side around the rotating rod 2 14. This causes the locking rod 16 at the other end to move upward, thus moving the locking rod 16 out of the corresponding locking hole 19. At this time, the connecting rod 1 4 is pulled upward. When the connecting rod 1 4 is pulled upward, the telescopic sleeve 2 3 moves upward. When the telescopic sleeve 2 3 moves upward, it will also move the double-sided toothed plate 8 towards... When the double-sided toothed plate 8 moves upward, it causes the rotating gear 7 that meshes with it to rotate. The other side of the rotating gear 7 meshes with a single-sided toothed plate 9, which is fixed. Therefore, when the rotating gear 7 rotates, the rotation becomes a linear upward motion, which in turn causes the telescopic sleeve 2 to move upward, achieving a multi-stage telescopic superposition effect. This greatly increases the overall telescopic stroke and can adapt to the usage needs of operators of different heights. After the adjustment is completed, by releasing the downward pressure on the connecting rod 12, under the elastic force of the elastic element 17, the rotating plate 15 is caused to rotate in the opposite direction, which in turn causes the locking rod 16 to be inserted into the corresponding locking hole 19, thereby fixing the position of the telescopic sleeve 3.

[0028] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A retractable structure for the operating armrest of an evacuation chair, comprising two mounting cylinders (1), characterized in that: Both mounting cylinders (1) have a groove 1 (10) on their inner side. A single toothed plate (9) is fixedly installed on the side of the groove 1 (10). Both mounting cylinders (1) have a telescopic sleeve 1 (2) slidably connected inside. Both ends of each telescopic sleeve 1 (2) are through. A through groove (5) is opened at the bottom of each telescopic sleeve 1 (2). A rotating rod 1 (6) is rotatably installed on the inner side of each through groove (5). A rotating gear (7) is fixedly installed on the outer surface of the rotating rod 1 (6). The rotating gear (7) meshes with the single toothed plate (9). The rotating gear (7) meshes with a double toothed plate (8). The double toothed plate (8) is located inside the telescopic sleeve 1 (2). A telescopic sleeve 2 (3) is fixedly installed on the upper end of the double toothed plate (8). Both telescopic sleeves 1 (2) have a self-locking structure on their outer surface.

2. The retractable armrest structure for an evacuation chair according to claim 1, characterized in that: Two of each of the groove one (10), the single-sided toothed plate (9), the through groove (5), the rotating rod one (6), and the rotating gear (7) are provided, and the two groove one (10), the single-sided toothed plate (9), the through groove (5), the rotating rod one (6), and the rotating gear (7) are arranged symmetrically.

3. The retractable armrest structure for an evacuation chair according to claim 1, characterized in that: Each of the self-locking structures includes a fixed sleeve (11), which is fixedly installed on the outer surface of the telescopic sleeve one (2). Two fixed plates (13) are fixedly installed on the outer surface of the fixed sleeve (11). Rotating rod two (14) is rotatably installed on the opposite side ends of the two fixed plates (13). Rotating plate (15) is fixedly installed on the outer surface of the rotating rod two (14). Locking rod (16) is fixedly installed on one end of the rotating plate (15). Elastic element (17) is fixedly installed at the bottom end of the other end of the rotating plate (15). The bottom end of the elastic element (17) is fixedly installed on the outer surface of the fixed sleeve (11). Multiple locking holes (19) arranged vertically and equidistantly are opened on the outer surface of the telescopic sleeve two (3).

4. The retractable armrest structure for an evacuation chair according to claim 3, characterized in that: The outer surface of the fixed sleeve (11) is provided with a groove two (18), and the bottom end of the elastic element (17) is fixedly installed at the inner bottom end of the groove two (18).

5. The retractable armrest structure for an evacuation chair according to claim 1, characterized in that: The upper ends of the two telescopic sleeves (3) are fixedly installed with connecting rods (4), the longitudinal section of the connecting rods (4) is circular, and the interior of the connecting rods (4) is hollow.

6. The retractable armrest structure for an evacuation chair according to claim 3, characterized in that, Connecting rod 2 (12) is fixedly installed on the upper end of the two rotating plates (15), and a limiting plate (20) is fixedly installed on the bottom end of the double-sided toothed plate (8).

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