Fire-fighting fire-extinguishing rescue windowsill lifting bracket

Abstract

The invention relates to the technical field of fire-fighting auxiliary equipment, and discloses a fire-fighting fire-extinguishing rescue windowsill lifting support which comprises a square stand column, a bottom supporting plate is arranged at the lower end of the square stand column, an operation box is arranged at the upper end of the square stand column, a worm and a worm wheel are rotationally connected into the operation box, and the worm is meshed with the worm wheel; the operation box is provided with a hand-cranking disc for operating the worm to rotate, the worm gear is in axial threaded connection with a lifting lead screw, the lifting lead screw penetrates through a bottom plate of the operation box and extends into the square stand column, the upper end of the lifting lead screw is provided with a top supporting plate, and the lower end, located in the square stand column, of the lifting lead screw is provided with a square base. The square seat is in vertical sliding fit with the square cavity in the square stand column; according to the fire-fighting fire-extinguishing rescue windowsill lifting support, the problem that an existing windowsill lifting support is poor in stability, bearing capacity and operation safety is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting auxiliary equipment, in particular to a fire-fighting rescue window ledge lifting support. BACKGROUND

[0002] In fire-fighting rescue, especially in high-rise building fire rescue, it is often necessary to use structures such as window ledges and balconies as fulcrums to quickly erect lifting devices for lifting water hoses, rescue equipment, or even personnel rescue. The window ledge lifting support is the key equipment to achieve this function, and its core requirements are rapid erection, stable support, and strong carrying capacity.

[0003] Among the existing fire-fighting window ledge lifting supports, the mechanical screw jacking support is a relatively common one. Its typical structure usually includes an intermediate column, and the upper and lower ends of the column are respectively provided with jacking plates that can move towards or away from each other through a threaded mechanism. By rotating the hand wheel or wrench, the threaded mechanism is driven to make the upper and lower jacking plates tightly press against the roof (or the window ledge) of the room where the window ledge is located and the ground, respectively, and the resulting large static friction force is used to achieve vertical fixation of the support.

[0004] However, this type of traditional screw jacking support has the following problems in actual application: 1. Limited stability and carrying capacity, its stability completely depends on the rigidity of a single square column and the threaded mechanism. When lifting heavy objects, the entire support acts like a cantilever beam, which will be subjected to a large lateral bending moment and shaking impact, easily leading to damage of the threaded mechanism or instability and overturning of the entire support, posing a serious safety hazard.

[0005] 2. Inconvenient operation and low efficiency, the lifting adjustment of the upper and lower jacking plates usually uses a simple positive and negative threaded sleeve, which requires rescue personnel to rotate multiple times during operation. In the time-critical rescue scene, the deployment speed is not ideal.

[0006] 3. Self-locking reliability problem, ordinary threaded mechanisms have the risk of loosening and rotating after long-term exposure to severe vibration and impact load, resulting in a decrease in jacking force and fixation failure. SUMMARY

[0007] The purpose of the present application is to provide a fire-fighting rescue window ledge lifting support to solve at least one of the above problems in the prior art.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions: The fire-fighting rescue window ledge lifting support comprises a square column, the lower end of the square column is provided with a bottom support plate, the upper end of the square column is provided with an operation box, a worm and a worm wheel are rotationally connected in the operation box, the worm is engaged with the worm wheel, a hand crank is arranged on the operation box and used for operating the worm to rotate, the worm wheel is axially and threadedly connected with a lifting lead screw, the lifting lead screw extends into the square column through the bottom plate of the operation box, the upper end of the lifting lead screw is provided with a top support plate, the lower end of the lifting lead screw in the square column is provided with a square seat, and the square seat is vertically and slidingly matched with a square cavity in the square column.

[0009] The transmission mode of the worm and the worm wheel driving the lifting lead screw can generate a great jacking force, so that the top support plate and the bottom support plate are closely combined with the building structure and a firm vertical fixation is provided. In addition, the transmission combination of the worm and the worm wheel has a natural reverse self-locking characteristic, that is, the worm can easily drive the worm wheel, but the worm wheel cannot reversely drive the worm, that is, once the support is jacked tightly, even if a greater vibration or load is generated during the lifting operation, the lifting lead screw will not be loosened and rotated, the safety hidden danger of the support loosening due to the decrease of the jacking force is reduced, and the safety of the rescue operation is improved.

[0010] The rapid lifting of the top support plate can be realized by rotating the hand crank, the operation is labor-saving, the transmission efficiency is high, and the firemen can realize rapid deployment in an emergency.

[0011] The square seat slides in the inner cavity of the square column, forms a large-area surface contact guide, can effectively transmit the lateral bending moment and torsional force generated in the lifting operation from the lifting lead screw to the pipe wall of the whole square column through the square seat, that is, the square column, the lifting lead screw and the square seat at the end form a rigid force transmission system, so that the overall rigidity and stability of the support are improved. In addition, the square column itself serves as a monolithic load-bearing member, the uniform contact of the square seat with the inner wall of the square cavity makes the load distribution more reasonable, avoids local overload, allows the support to bear a greater lifting weight, and when a sudden impact load (such as the rescued person suddenly grasping the rope) is encountered, the support can maintain a very high stability, ensuring the safety of the rescuers and the rescued.

[0012] The whole transmission and guide system is sealed inside the operation box and the square column and is well protected, can adapt to the harsh dust and humid environment of the fire rescue site, and ensures the long-term reliability and low maintenance cost of the equipment.

[0013] In summary, the technical solution solves the defects of the existing window ledge lifting support in stability, carrying capacity and operation safety by combining the square column with the square seat and the efficient worm and worm wheel transmission.

[0014] Furthermore, the square column is fitted with a square lifting ring, which slides vertically with the square column. The square lifting ring is provided with an extension arm, and the end of the extension arm is provided with a pulley. The extension arm is provided with an outer locking arm and an inner locking arm, which are used to abut against the outer and inner walls of the window sill. An adjustable-width limiting space is formed between the outer locking arm and the inner locking arm.

[0015] Traditional supports rely solely on the friction between the upper and lower top support plates to resist overturning. However, this design uses outer and inner clamping arms to directly clamp onto the solid structure of the window sill, providing reliable lateral mechanical restraint. This integrates the vertical top support fixing with the lateral window sill clamping fixing, creating a three-dimensional anchoring system that is vertically tightened and horizontally locked with the building structure. This further reduces the possibility of the support overturning or slipping, resulting in higher safety.

[0016] The square lifting ring can be flexibly adjusted in height along the square column, allowing the clamping arm system to accurately align with window sills of different heights. The adjustable width of the limiting space allows the bracket to adapt to window sills, walls, or railings of various thicknesses. Whether it's a traditional thin window sill or a modern thick wall, a tight clamping action can be achieved by adjusting the distance between the inner and outer clamping arms, expanding the equipment's application scenarios.

[0017] The pulley at the end of the extension arm provides a guide fulcrum for the hoisting rope, extending the rope's stress point directly to the outside of the window. This avoids severe friction between the rope and the window sill edge, protecting the rope and making the hoisting operation more effortless and smooth.

[0018] Furthermore, the outer locking arm is fixed to the outer end of the extension arm, the inner locking arm is slidably disposed on the extension arm, and a locking element is provided between the inner locking arm and the extension arm.

[0019] By sliding the inner locking arm, rescuers can steplessly and continuously adjust the limiting space width between the outer and inner locking arms. This allows the bracket to precisely adapt to various window sill thicknesses, from thin window sills to thick composite walls, making it more versatile and overcoming the limitations of fixed-size or segmented adjustable locking arms.

[0020] The operator first slides the inner locking arm to contact the inside of the window sill, then tightens the locking mechanism. The entire process is intuitive and quick, requiring no additional tools. Compared to structures that require simultaneous adjustment of two symmetrical locking arms, this asymmetrical design with one arm moving and the other stationary simplifies the operation, reduces the operator's cognitive load and operation time in emergency situations, and buys valuable time for rescue.

[0021] Furthermore, the extension arm is a rectangular arm, the inner locking arm has a square hole, the rectangular arm passes through the square hole and the two slide together, the locking element is a bolt, the upper end of the inner locking arm has a threaded hole, the bolt is threadedly connected to the threaded hole and the lower end of the bolt abuts against the upper end of the rectangular arm.

[0022] The rectangular arm passes through the square hole on the inner clamping arm, forming a large-area surface contact sliding pair. This non-circular fit fundamentally eliminates the possibility of the inner clamping arm rotating around the extension arm when under force.

[0023] Adjustment is simple: just loosen the bolt, slide the inner locking arm, and then tighten the bolt. The operation logic is straightforward and intuitive, requiring no training to master. The locking structure has very few parts; if the bolt is damaged, it can be quickly replaced using common tools, resulting in extremely low maintenance costs. This meets the high standards of reliability and ease of maintenance required for fire-fighting equipment.

[0024] Furthermore, the upper end of the rectangular arm is provided with a strip groove along its length direction, and the lower end of the bolt is located in the strip groove and abuts against the inner bottom wall of the strip groove.

[0025] The groove positions the lower end of the bolt, ensuring that the bolt remains on the center line of the rectangular arm when tightened, preventing lateral slippage during tightening or when subjected to lateral forces.

[0026] Furthermore, in order to facilitate locking the height position of the square lifting ring, a locking bolt is provided between the square column and the square lifting ring.

[0027] Furthermore, for ease of operation, the locking bolt is threaded into the square lifting ring, the inner end of the locking bolt abuts against the square column, and the outer end of the locking bolt is provided with an operating handle.

[0028] Furthermore, in order to improve the support stability of the bottom support plate and the top support plate, both the bottom support plate and the top support plate are provided with anti-slip pads.

[0029] The anti-slip mat layer (typically made of high-friction rubber or polyurethane materials) forms a soft contact with building surfaces (such as floor tiles, concrete roofs, and window sills). Its microscopic deformation can fully embed itself into the tiny unevenness of the contact surface, thereby generating a static friction force far exceeding the maximum static friction force of direct metal-to-building surface contact. This further ensures that the upper and lower support points of the support frame will not slip due to lateral forces or vibrations when lifting heavy objects. A rigid metal top plate directly pressed against a building surface can easily damage smooth floor tiles, wooden floors, or plaster ceilings, causing property damage. As a flexible buffer, the anti-slip mat layer can evenly distribute the enormous supporting pressure, effectively preventing indentations, scratches, or structural damage to the contact surface. The beneficial effects of this invention are as follows: This technical solution, through the transmission method of driving the lifting screw with a worm gear, can generate a large supporting force, ensuring that the top and bottom support plates are tightly fitted to the building structure, providing a solid vertical fixation. Furthermore, the transmission combination of worm and worm wheel has a natural reverse self-locking characteristic; that is, the worm can easily drive the worm wheel, but the worm wheel cannot drive the worm in the reverse direction. In other words, once the support is tightened, even with significant vibration or load during hoisting operations, the lifting screw will not loosen or rotate, reducing the safety hazard of support loosening due to a decrease in supporting force and improving the safety of rescue operations.

[0030] The top support plate can be quickly raised and lowered by turning the hand crank, which is labor-saving and has high transmission efficiency, helping firefighters to deploy quickly in emergency situations.

[0031] The square seat slides within the inner cavity of the square column, creating a large surface contact guide. This effectively transmits the lateral bending moment and torsional force generated during hoisting operations directly from the lifting screw through the square seat to the entire wall of the square column. In other words, the square column, lifting screw, and the square seat at the end form a rigid force transmission system, enhancing the overall rigidity and stability of the support structure. Furthermore, as a monolithic load-bearing component, the square column itself, with its uniform contact between the square seat and the inner wall of the square cavity, results in a more rational load distribution, preventing localized overload and allowing the support to withstand greater hoisting weights. When faced with sudden impact loads (such as a rescued person suddenly gripping a rope), the support maintains extremely high stability, ensuring the safety of both rescuers and the rescued person.

[0032] The entire transmission and guidance system is sealed inside the control box and square column, providing excellent protection and enabling it to withstand the harsh dust and humid environment of fire rescue sites, thus ensuring the long-term reliability and low maintenance costs of the equipment.

[0033] In summary, this technical solution, through the combination of square column and square base, and efficient worm gear transmission, solves the deficiencies of existing window sill lifting brackets in terms of stability, load-bearing capacity, and operational safety. Attached Figure Description

[0034] Fig. 1 This is a structural schematic diagram from a first perspective of the present invention; Fig. 2 This is a structural schematic diagram from a second perspective of the present invention; Fig. 3 This is a cross-sectional structural diagram of the present invention.

[0035] In the diagram: 1. Square column; 2. Bottom support plate; 3. Control box; 4. Worm gear; 5. Worm wheel; 6. Hand crank; 7. Lifting screw; 8. Top support plate; 9. Square seat; 10. Square cavity; 11. Square lifting ring; 12. Extension arm; 13. Pulley; 14. Outer locking arm; 15. Inner locking arm; 16. Window sill; 17. Square hole; 18. Bolt; 19. Strip groove; 20. Locking bolt; 21. Operating handle; 22. Anti-slip pad. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0037] Example 1: like Figs. 1-3 As shown, this embodiment provides a fire extinguishing and rescue window sill lifting bracket, including a square column 1. The lower end of the square column 1 is provided with a bottom support plate 2, and the upper end of the square column 1 is provided with an operation box 3. A worm gear 4 and a worm wheel 5 are rotatably connected inside the operation box 3. The worm gear 4 and the worm wheel 5 are meshed. The operation box 3 is provided with a hand crank 6 for rotating the worm gear 4. The worm wheel 5 is axially threadedly connected with a lifting screw 7. The lifting screw 7 passes through the bottom plate of the operation box 3 and extends into the square column 1. The upper end of the lifting screw 7 extending out of the operation box 3 is provided with a top support plate 8. The lower end of the lifting screw 7 located inside the square column 1 is provided with a square seat 9. The square seat 9 is vertically slidingly engaged with the square cavity 10 inside the square column 1.

[0038] This technical solution, through the transmission method of worm gear 5 and worm 4 driving lifting screw 7, can generate a large supporting force, ensuring that the top support plate 8 and bottom support plate 2 are tightly fitted to the building structure, providing a solid vertical fixation. Furthermore, the transmission combination of worm gear 4 and worm 4 has a natural reverse self-locking characteristic; that is, worm gear 4 can easily drive worm gear 5, but worm gear 5 cannot drive worm gear 4 in the reverse direction. In other words, once the support is tightened, even during lifting operations with significant vibration or load, lifting screw 7 will not loosen or rotate, reducing the safety hazard of support loosening due to decreased supporting force and improving the safety of rescue operations.

[0039] The top support plate 8 can be quickly raised and lowered by turning the hand crank 6. The operation is labor-saving and the transmission efficiency is high, which helps firefighters to deploy quickly in emergency situations.

[0040] The square seat 9 slides within the inner cavity of the square column 1, forming a large-area surface contact guide. This effectively transmits the lateral bending moment and torsional force generated during hoisting operations directly from the lifting screw 7 through the square seat 9 to the entire wall of the square column 1. In other words, the square column 1, the lifting screw 7, and the square seat 9 at the end form a rigid force transmission system, enhancing the overall rigidity and stability of the support structure. Furthermore, as an integral load-bearing component, the square column 1, with its uniform contact between the square seat 9 and the inner wall of the square cavity, ensures a more reasonable load distribution, preventing localized overload and allowing the support to withstand greater hoisting weight. When facing sudden impact loads (such as a rescued person suddenly gripping a rope), the support maintains extremely high stability, ensuring the safety of both rescuers and the rescued person.

[0041] The entire transmission and guidance system is sealed inside the control box 3 and the square column 1, which provides good protection and enables it to adapt to the harsh dust and humid environment at fire rescue sites, ensuring the long-term reliability and low maintenance cost of the equipment.

[0042] In summary, this technical solution, through the combination of a square column and a square base, and a highly efficient worm gear 5-worm 4 transmission, solves the deficiencies of existing window sill lifting brackets in terms of stability, load-bearing capacity, and operational safety.

[0043] Example 2: This embodiment is an optimization based on the above embodiment 1.

[0044] A square lifting ring 11 is provided on the outer sleeve of the square column 1. The square lifting ring 11 is vertically slidingly engaged with the square column 1. An extension arm 12 is provided on the square lifting ring 11. A pulley 13 is provided at the end of the extension arm 12. An outer locking arm 14 and an inner locking arm 15 are provided on the extension arm 12. The outer locking arm 14 and the inner locking arm 15 are used to abut against the outer and inner walls of the window sill 16. An adjustable limiting space is formed between the outer locking arm 14 and the inner locking arm 15.

[0045] Traditional supports rely solely on the friction between the upper and lower top support plates to resist overturning. However, this design uses the outer clamping arm 14 and the inner clamping arm 15 to directly clamp onto the solid structure of the window sill, providing reliable lateral mechanical restraint. This integrates the vertical top support fixing with the lateral window sill clamping fixing, creating a three-dimensional anchoring system that is vertically tightened and horizontally locked with the building structure. This further reduces the possibility of the support overturning or slipping, resulting in higher safety.

[0046] The square lifting ring 11 can be flexibly adjusted in height along the square column 1, allowing the outer clamping arm 14 and the inner clamping arm 15 to be precisely aligned with window sills of different heights. The adjustable width of the limiting space allows the bracket to adapt to window sills, walls, or railings of various thicknesses. Whether it is a traditional thin window sill or a modern thick wall, a tight clamping can be achieved by adjusting the distance between the outer clamping arm 14 and the inner clamping arm 15, expanding the application scenarios of the equipment.

[0047] The pulley 13 at the end of the extension arm 12 provides a guide fulcrum for the hoisting rope, which extends the stress point of the rope directly to the outside of the window, avoiding severe friction between the rope and the edge of the windowsill. This not only protects the rope but also makes the hoisting operation more effortless and smooth.

[0048] Example 3: This embodiment is an optimization based on the above embodiment 2.

[0049] The outer locking arm 14 is fixed to the outer end of the extension arm 12, and the inner locking arm 15 is slidably disposed on the extension arm 12. A locking element is provided between the inner locking arm 15 and the extension arm 12.

[0050] By sliding the inner locking arm 15, rescuers can steplessly and continuously adjust the limiting space width between the outer locking arm 14 and the inner locking arm 15. This allows the bracket to precisely adapt to various window sill thicknesses, from thin window sills to thick composite walls, making it more versatile and overcoming the limitations of fixed-size or segmented adjustable locking arms.

[0051] The operator first slides the inner locking arm 15 to contact the inner side of the window sill, and then tightens the locking mechanism. The whole process is intuitive and quick, requiring no additional tools. Compared to structures that require simultaneous adjustment of two symmetrical locking arms, this asymmetrical design with one moving and one stationary simplifies the operation, reduces the cognitive load and operation time of the operator in emergency situations, and buys valuable time for rescue.

[0052] Example 4: This embodiment is an optimization based on the above embodiment 3.

[0053] The extension arm 12 is a rectangular arm. The inner clamping arm 15 has a square hole 17. The rectangular arm passes through the square hole 17 and the two slide together. The locking element is a bolt 18. The upper end of the inner clamping arm 15 has a threaded hole. The bolt 18 is threadedly connected to the threaded hole and the lower end of the bolt 18 abuts against the upper end of the rectangular arm.

[0054] The rectangular arm passes through the square hole 17 on the inner clamping arm 15, forming a large-area surface contact sliding pair. This non-circular fit fundamentally eliminates the possibility of the inner clamping arm 15 rotating around the extension arm 12 when under force.

[0055] Adjustment is simple: just loosen bolt 18, slide the inner locking arm 15, and then tighten bolt 18. The operation logic is straightforward and intuitive, requiring no training to master. This locking structure has very few parts; if bolt 18 is damaged, it can be quickly replaced using general-purpose tools, resulting in extremely low maintenance costs. This meets the high standards of reliability and ease of maintenance required for fire-fighting equipment.

[0056] Example 5: This embodiment is an optimization based on the above embodiment 4.

[0057] The upper end of the rectangular arm is provided with a strip groove 19 along its length direction, and the lower end of the bolt 18 is located in the strip groove 19 and the lower end of the bolt 18 abuts against the inner bottom wall of the strip groove 19.

[0058] The groove 19 positions the lower end of the bolt 18, ensuring that the bolt 18 is always located on the center line of the rectangular arm when tightened, preventing it from sliding laterally during tightening or when subjected to lateral forces.

[0059] Example 6: This embodiment is an optimization based on the above embodiment 2.

[0060] To facilitate locking the height position of the square lifting ring 11, a locking bolt 20 is provided between the square column 1 and the square lifting ring 11.

[0061] Example 7: This embodiment is an optimization based on the above embodiment 6.

[0062] For ease of operation, the locking bolt 20 is threadedly engaged with the square lifting ring 11, the inner end of the locking bolt 20 abuts against the square column 1, and the outer end of the locking bolt 20 is provided with an operating handle 21.

[0063] Example 8: This embodiment is an optimization based on the above embodiment 1.

[0064] To improve the support stability of the bottom support plate 2 and the top support plate 8, anti-slip pads 22 are provided on both the bottom support plate 2 and the top support plate 8.

[0065] The anti-slip pad 22 (typically made of high-friction rubber or polyurethane material) forms a soft contact with the building surface (such as floor tiles, concrete roofs, and window sills). Its microscopic deformation can fully embed into the tiny unevenness of the contact surface, thereby generating a static friction force far exceeding the maximum static friction force of direct metal-to-building surface contact. This further ensures that the upper and lower support points of the support will not slip due to lateral forces or vibrations when lifting heavy objects. A rigid metal top plate pressed directly against the building surface can easily damage smooth floor tiles, wooden floors, or plaster ceilings, causing property damage. The anti-slip pad 22, as a flexible buffer medium, can evenly distribute the huge support pressure, effectively preventing indentations, scratches, or structural damage to the contact surface. Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fire fighting and rescue window ledge hoisting support characterized by: The square column is provided with a bottom support plate at the lower end and an operation box at the upper end, the operation box is rotationally connected with a worm and a worm wheel, the worm is engaged with the worm wheel, the operation box is provided with a hand crank for operating the rotation of the worm, the worm wheel is axially screw-connected with a lifting lead screw, the lifting lead screw extends into the square column through the bottom plate of the operation box, the upper end of the lifting lead screw is provided with a top support plate, and the lower end of the lifting lead screw in the square column is provided with a square seat which is vertically and slidingly matched with a square cavity in the square column.

2. The fire fighting and rescue window hoisting support according to claim 1, characterized in that: The square column is provided with a square lifting ring which is vertically and slidingly matched with the square column, the square lifting ring is provided with an extension arm, the end of the extension arm is provided with a pulley, and the extension arm is provided with an outer clamping arm and an inner clamping arm which are used for abutting against the outer and inner walls of the window frame to form a limiting space with adjustable width.

3. The fire fighting and rescue window hoisting support according to claim 2, characterized in that: The outer clamping arm is fixed to the outer end of the extension arm, the inner clamping arm is slidingly arranged on the extension arm, and the inner clamping arm is provided with a locking member between the extension arm.

4. The fire fighting and rescue window hoisting support according to claim 3, characterized in that: The extension arm is a rectangular arm, the inner clamping arm is provided with a square hole, the rectangular arm passes through the square hole and they are slidingly matched, the locking member is a bolt, the upper end of the inner clamping arm is provided with a threaded hole, the bolt is screw-connected at the threaded hole, and the lower end of the bolt is abutted against the upper end of the rectangular arm.

5. The fire fighting and rescue window hoisting support according to claim 4, characterized in that: The upper end of the rectangular arm is provided with a strip-shaped groove along the length direction, the lower end of the bolt is located in the strip-shaped groove, and the lower end of the bolt is abutted against the inner bottom wall of the strip-shaped groove.

6. The fire fighting and rescue window hoisting support according to claim 2, characterized in that: The square column and the square lifting ring are provided with a locking bolt.

7. The fire fighting and rescue window hoisting support according to claim 6, characterized in that: The locking bolt is screw-matched with the square lifting ring, the inner end of the locking bolt is abutted against the square column, and the outer end of the locking bolt is provided with an operating handle.

8. The fire fighting and rescue window hoisting support according to claim 1, characterized in that: The bottom support plate and the top support plate are both provided with an anti-skid pad.

Images