Marine extension ladder

Abstract

The utility model discloses a marine extension ladder which comprises a plurality of ladder sections, each ladder section comprises two handrail pipes and a treading body, the two handrail pipes of each lower ladder section are inserted into and sleeved with the two handrail pipes of the adjacent upper ladder section, the handrail pipes are oval pipes, the upper end parts of the handrail pipes expand outwards to form expansion pipe parts, and the treading bodies are arranged on the ladder sections. A rolling groove is formed in the peripheral wall of the lower end of the pipe expanding part in an inwards-concave mode so that a protruding stopping part can be formed in an inner cavity of the corresponding pipe, and the pipe expanding part is oval. The end faces of the two ends of the treading body are provided with curved surfaces matched with the handrail pipes respectively. The curved surfaces at the two ends of the treading body abut against the peripheral walls of the two handrail pipes correspondingly and are fixedly connected through the laser welding technology. The ladder sections are telescopically connected through the backstop parts and the expansion tube parts, the production process is simple, and the connection is reliable; the curved surfaces matched with the handrail pipes are arranged at the two ends of the treading body, and the treading body is fixedly connected with the handrail pipes through the laser welding process, so that the accessory investment is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic ladders, in particular to a marine telescopic ladder. Background Art

[0002] In some places where people hang from top to bottom, such as boats, yachts, kayaks, etc., telescopic ladders are usually installed to facilitate diving, swimming or working. The telescopic ladders usually include several ladder sections, each of which includes two handrail tubes and a treadle body connecting the two handrail tubes. The two handrail tubes of each lower ladder section are inserted and sleeved into the two handrail tubes of the adjacent upper ladder section. Most of the existing treadles and handrail tubes are connected by connecting accessories, resulting in many accessories and complicated assembly process. Summary of the invention

[0003] In order to overcome the above defects, the utility model provides a marine telescopic ladder, which connects the treadle body and the handrail pipe by welding, and has high production efficiency.

[0004] The utility model adopts a technical solution to solve the technical problem: provide a marine telescopic ladder, including a plurality of ladder sections, each of which includes two handrail tubes arranged opposite to each other, and a tread body connected between the two handrail tubes, the two handrail tubes of each lower ladder section are inserted and sleeved in the two handrail tubes of the adjacent upper ladder section, the handrail tube is an elliptical tube, the upper end of which is expanded outward to form an expanded tube portion, and the outer peripheral wall of the lower end is inwardly concave with a rolling groove to form a protruding stopper portion in the corresponding tube inner cavity; the expanded tube portion is elliptical, and the expanded tube portion of the handrail tube of the upper ladder section can be hung on the stopper portion of the handrail tube of the lower ladder section;

[0005] The end surfaces at both ends of the treading body are respectively provided with curved surfaces adapted to the handrail tubes; the curved surfaces at both ends of the treading body are respectively pressed against the outer peripheral walls of the two handrail tubes and are fixedly connected by laser welding technology.

[0006] As a further improvement of the utility model, the pedal body includes a flat pedal portion and connecting portions arranged at both ends of the pedal portion, the upper half of the connecting portion expands outward in a trumpet shape, and the curved surface is arranged on the end surface of the connecting portion away from the pedal portion.

[0007] As a further improvement of the utility model, the two connecting parts are fixedly connected to the rolling grooves of the two handrail tubes respectively.

[0008] As a further improvement of the utility model, the distance between the rolling groove and the pipe opening of the handrail pipe near one end thereof is at least greater than the thickness of the connecting portion, and the pipe opening shrinks inwardly to form an elliptical shrinkage.

[0009] As a further improvement of the present invention, the diameter of the handrail tube gradually decreases from the uppermost step to the lowermost step, and the outer diameter of the handrail tube of the lower step is equal to the inner diameter of the elliptical cavity surrounded by the stopper on the handrail tube of the upper step adjacent thereto.

[0010] As a further improvement of the utility model, an anti-skid pad is provided on the treading portion, and the anti-skid pad is provided with concave-convex patterns along its length direction.

[0011] As a further improvement of the present invention, the marine telescopic ladder also includes two groups of positioning assemblies, which are respectively arranged at the upper end of the handrail tube of the uppermost ladder section, and each group of positioning assemblies includes a connecting piece and a shaft, and the connecting piece is rotatably connected to the handrail tube through the shaft, and the connecting piece is provided with mounting holes spaced apart along its length direction.

[0012] As a further improvement of the present invention, the connecting member includes an arc-shaped limiting portion, and a matching portion arranged on one side of the arc surface of the arc-shaped limiting portion and extending far away, the matching portion has a groove portion adapted to the outer diameter of the handrail tube of the uppermost stair section, and the mounting hole is arranged on the bottom surface of the groove portion.

[0013] The beneficial effects of the utility model are:

[0014] 1. By setting the stopper and the expansion tube, each ladder section can be telescopically connected, the production process is simple and the connection is reliable;

[0015] 2. By setting curved surfaces that match the handrail tube at both ends of the treadle body and using laser welding technology to fix the connection, the investment in accessories can be reduced and the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model connecting piece in an unfolded state;

[0017] Figure 2 It is a schematic diagram of the exploded structure of the middle stair section of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the connecting piece of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the utility model when the connecting piece is in a retracted state.

[0020] Combined with the accompanying drawings, the following description is given:

[0021] 1. Handrail tube; 11. Expansion tube part; 12. Rolling groove; 13. Stop part; 14. Shrinkage; 2. Pedal body; 21. Curved surface; 22. Pedal part; 23. Connecting part; 3. Anti-slip pad; 31. Concave and convex texture; 4. Positioning assembly; 41. Connecting piece; 411. Mounting hole; 412. Arc-shaped limiting part; 413. Fitting part; 4131. Groove part; 42. Shaft. DETAILED DESCRIPTION

[0022] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0023] participate Figures 1 to 4 The utility model provides an embodiment of a marine telescopic ladder, which includes three groups of ladder sections, but is not limited to three groups. Each ladder section includes two handrail tubes 1 arranged opposite to each other, and a treadle body 2 connected between the two handrail tubes 1. The two handrail tubes 1 of each lower ladder section are inserted into and sleeved in the two handrail tubes 1 of the adjacent upper ladder section. The handrail tube 1 is an elliptical tube, and its upper end is expanded to form an expansion tube portion 11, and a rolling groove 12 is provided on the outer peripheral wall of the lower end to form a protruding stopper portion 13 in the inner cavity of the tube; the expansion tube portion 11 is elliptical, and the expansion tube portion 11 of the handrail tube 1 of the upper ladder section can be hung on the stopper portion 13 of the handrail tube 1 of the lower ladder section to complete the telescopic connection between the handrail tubes 1 of the adjacent ladder sections.

[0024] Specifically, the diameter of the handrail tube 1 gradually decreases from the top step to the bottom step, and the outer diameter of the handrail tube 1 of the bottom step is equal to the inner diameter of the elliptical cavity surrounded by the stopper 13 on the handrail tube 1 of the upper step adjacent thereto. Therefore, the handrail tube can be retracted section by section to the handrail tube of the top step (i.e., the handrail tube with the largest inner diameter), so that the volume of the telescopic ladder is minimized. At the same time, by providing the expansion tube part 11 and the stopper 13, the two adjacent sections of the handrail tube 1 can be stably connected, and the function of telescopic hanging is realized, the structure is simple, and the production cost is reduced. In addition, the end faces of the tread body 2 at both ends are respectively provided with curved surfaces 21 adapted to the handrail tube 1; the curved surfaces 21 at both ends of the tread body 2 are respectively abutted against the outer peripheral walls of the two handrail tubes 1 and fixedly connected by laser welding technology, so as to reduce the investment in accessories and improve production efficiency.

[0025] Furthermore, the treading body 2 includes a flat treading portion 22 and connecting portions 23 provided at both ends of the treading portion 22, the upper half of the connecting portion 23 expands outward in a trumpet shape, and the curved surface 21 is provided on the end surface of the connecting portion 23 away from the treading portion 22. The upper half of both ends of the treading body 2 is provided in a semi-trumpet cone shape expanding outward, which helps to increase the contact area between the end curved surface 21 of the treading body 2 and the outer peripheral wall of the handrail tube 1, so that the welding length is increased, thereby increasing the welding area to improve the welding strength, ensuring the connection strength between the treading body 2 and the handrail tube 1, saving the investment in accessories, simplifying the process, and having high production efficiency. After polishing, the welding position is flat and beautiful.

[0026] Furthermore, the two ends of the treading body 2 respectively abut against the rolling grooves 12 of the two handrail tubes 1 , so the setting of the rolling grooves 12 can form a stopper 13 and provide a reference for the position positioning of the treading body 2 .

[0027] The rolling groove 12 covered by the curved surface 21 of the tread body 2 is filled with gaps through the seam welding process to position the tread body 2 on the handrail tube 1, and then the laser welding process is used to weld along the contour formed by the tread body 2 on the handrail tube 1 to complete the positioning connection between the tread body 2 and the handrail tube 1. The role of spot welding is, on the one hand, to position the tread body 2 on the handrail tube 1, and on the other hand, to fill the gaps on both sides of the rolling groove 12 close to the tread body 2 to prevent it from affecting the overall welding strength of the tread body 2.

[0028] Furthermore, the distance between the rolling groove 12 and the pipe mouth of the handrail tube 1 near one end thereof is slightly larger than the thickness of the connecting portion 23, so that the telescopic ladder can be in the smallest contracted state after contraction; at the same time, the pipe mouth contracts inwardly to form an elliptical constriction 14, and the constriction 14 of the handrail tube 1 of the upper stair section is slightly larger than the diameter of the handrail tube 1 of the adjacent lower stair section. On the one hand, it can ensure the normal contraction of the telescopic ladder, and on the other hand, it can avoid the appearance of edges on the pipe mouth after grinding and polishing to avoid safety hazards.

[0029] Furthermore, an anti-skid pad 3 is provided on the treading portion 22, and a concave-convex pattern 31 is provided on the anti-skid pad 3 along its length direction. In addition, the treading body 2 is tilted at a certain angle to facilitate the practical personnel to tread and climb.

[0030] Furthermore, the marine telescopic ladder also includes two sets of positioning components 4, which are respectively arranged at the upper end of the handrail tube 1 of the uppermost ladder section, and each set of positioning components 4 includes a connector 41 and a shaft 42. The connector 41 is rotatably connected to the handrail tube 1 through the shaft 42, so that the connector 41 can rotate between 0° and 90° to present two states of the connector 41 and the handrail tube 1 being deployed and retracted. The connector 41 includes an arc-shaped limiting portion 412, and a matching portion 413 arranged on one side of the arc surface of the arc-shaped limiting portion 412 and extending to a distance. Among them, the curvature of the arc-shaped limiting portion 412 matches the outer peripheral wall of the handrail tube 1 to stop the connector 41 in the deployed state so that it maintains a 90° state.

[0031] In addition, the matching portion 413 has a groove portion 4131 adapted to the outer diameter of the handrail tube 1 of the uppermost stair section, and mounting holes 411 are provided at intervals on the bottom surface of the groove portion 4131 along its length direction.

[0032] See also Figure 1 When the connecting piece is in the unfolded state, the arc-shaped limiting portion 412 stops on the side wall of the handrail tube 1, and the notch of the groove portion 4131 of the matching portion 413 faces upward, so that the telescopic ladder is easily connected to the hull through the mounting hole 411.

[0033] See also Figure 4 When the connecting piece is retracted, the connecting piece 41 rotates to the other side of the handrail tube 1, and the notch of the groove portion 4131 faces one side of the handrail tube 1, so that the corresponding position of the handrail tube 1 is placed in the groove portion 4131, so that the connecting piece 41 is fitted with the handrail tube 1 to complete the retraction of the connecting piece.

[0034] In summary, the marine telescopic ladder provided by the utility model enables each ladder section to be telescopically connected by arranging a stopper and an expansion tube portion, and the production process is simple and the connection is reliable; by arranging curved surfaces that are compatible with the handrail tube at both ends of the tread body and using a laser welding process to fix the connection, the investment in accessories can be reduced and the production efficiency can be improved.

[0035] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A marine telescopic ladder, comprising a plurality of ladder sections, each of which comprises two handrail tubes (1) arranged opposite to each other, and a stepping body (2) connected between the two handrail tubes (1), the two handrail tubes (1) of each lower ladder section are inserted and sleeved into the two handrail tubes (1) of the adjacent upper ladder section, characterized in that: The handrail tube (1) is an elliptical tube, the upper end of which is expanded outward to form an expanded tube portion (11), and the outer peripheral wall of the lower end is inwardly concavely provided with a rolling groove (12) to form a protruding stop portion (13) in the corresponding tube cavity; the expanded tube portion (11) is elliptical, and the expanded tube portion (11) of the handrail tube (1) of the upper stair section can be hung on the stop portion (13) of the handrail tube (1) of the lower stair section; The end surfaces at both ends of the tread body (2) are respectively provided with curved surfaces (21) adapted to the handrail tube (1); the curved surfaces (21) at both ends of the tread body (2) respectively abut against the outer peripheral walls of the two handrail tubes (1) and are fixedly connected by a laser welding process.

2. The marine telescopic ladder according to claim 1, characterized in that: The pedal body (2) comprises a flat pedal portion (22) and connecting portions (23) arranged at both ends of the pedal portion (22); the upper half of the connecting portion (23) expands outward in a trumpet shape, and the curved surface (21) is arranged on a side end surface of the connecting portion (23) away from the pedal portion (22).

3. The marine telescopic ladder according to claim 2, characterized in that: The two connection portions (23) are respectively fixedly connected to the rolling grooves (12) of the two handrail tubes (1).

4. The marine telescopic ladder according to claim 3, characterized in that: The distance between the rolling groove (12) and the pipe opening of the handrail pipe (1) near one end thereof is at least greater than the thickness of the connecting portion (23), and the pipe opening shrinks inwardly to form an elliptical shrinkage opening (14).

5. The marine telescopic ladder according to claim 4, characterized in that: The diameter of the handrail tube (1) gradually decreases from the uppermost step to the lowermost step, and the outer diameter of the handrail tube (1) of the lower step is equal to the inner diameter of the elliptical cavity surrounded by the stopper (13) on the handrail tube (1) of the upper step adjacent thereto.

6. The marine telescopic ladder according to claim 2, characterized in that: The treading portion (22) is provided with an anti-skid pad (3), and the anti-skid pad (3) is provided with concave-convex patterns (31) along its length direction.

7. The marine telescopic ladder according to claim 1, characterized in that: The marine telescopic ladder further comprises two groups of positioning assemblies (4), the two groups of positioning assemblies (4) being respectively arranged at the upper end of the handrail tube (1) of the uppermost ladder section, each group of positioning assemblies (4) comprising a connecting member (41) and a shaft (42), the connecting member (41) being rotatably connected to the handrail tube (1) via the shaft (42), and the connecting member (41) being provided with mounting holes (411) spaced apart along its length direction.

8. The marine telescopic ladder according to claim 7, characterized in that: The connecting member (41) comprises an arc-shaped limiting portion (412), and a matching portion (413) which is arranged on one side of the arc surface of the arc-shaped limiting portion (412) and extends far away, the matching portion (413) has a groove portion (4131) adapted to the outer diameter of the handrail tube (1) of the uppermost stair section, and the mounting hole (411) is arranged on the bottom surface of the groove portion (4131).

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