Ladder

Abstract

A ladder that enables unwanted accidents to be avoided by means of a simplified structure and mechanism, said ladder comprising: a main structure (10) comprising stringers (11), rungs (12) and an upper platform (13); and a support leg (20) in the shape of a tube (22) pivotally connected to the upper platform (13). The upper platform comprises a top face, two side faces, a front face, and a rear face, wherein said side faces have connection means to a connector of the support leg (20). In addition, the rear face has a slot (24) whose height is less than the diameter of the tube (22).

Claims

1. A ladder for preventing unwanted accidents by means of a simplified structure and mechanism, said ladder comprising: a main structure (10) including stringers (11), rungs (12), and an upper platform (13); and a support leg (20) in the shape of a tube (22), pivotally connected to the upper platform (13); CHARACTERIZED in that the upper platform comprises a top face, two side faces, a front face, and a rear face, wherein said side faces have connection means to connect to a connector of the support leg (20); and in that the rear face has a slot (24) whose height is less than the diameter of the tube (22).

2. The ladder according to claim 1, wherein the support leg connector is a cylinder pin (23) that passes perpendicularly through the tube (22), near its upper end, wherein the ends of the pin (23) are connected to the upper platform by means of bolts.

3. The ladder according to claim 2, wherein the pin (23) is attached to a pair of welded plates on each side of the tube (22).

4. The ladder according to claim 3, wherein the support leg (20) has a gripping element (25) at its lower end.

5. The ladder according to claim 4, wherein said gripping element has two or more points of support with the ground.

6. The ladder according to claim 4, wherein the gripping element has a convex curved shape.

7. The ladder according to claim 1, CHARACTERIZED in that the connecting means consist of holes (16).

8. The ladder according to claim 1, CHARACTERIZED in that the stringers (11) are partially curved and positioned in such a way that the convex faces of both stringers (11) are facing each other.

9. The ladder according to claim 1, CHARACTERIZED in that the stringers (11) and rungs (12) are channel-shaped.

10. The ladder according to claim 1, CHARACTERIZED in that the stringers (11) and rungs (12) are joined together by rivets (14).

11. The ladder according to claim 1, CHARACTERIZED in that the stringers (11) and rungs (12) are joined together by rivets and gussets (15).

Description

DESCRIPTION OF THE FIGURES

[0019] FIG. 1 illustrates a perspective view of the ladder of the invention.

[0020] FIG. 2 illustrates a front view of the ladder of the invention.

[0021] FIG. 3 illustrates a rear view of the ladder of the invention.

[0022] FIG. 4 illustrates a profile view of the ladder of the invention.

[0023] FIG. 5 illustrates a detail of the joining mechanism between the main structure and the support leg of the ladder of the invention.

[0024] FIG. 6 illustrates in detail the main elements of the support leg of the ladder of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0025] The ladder according to the embodiment observed in FIGS. 1 to 4 consists of a main structure 10 comprising stringers 11, rungs 12, and an upper platform 13, in addition to a tube-shaped support leg 20. The main structure 10 and the support leg 20 are connected to each other by a hinged joint so that the angle formed between the two elements may vary.

[0026] As can be seen in FIG. 2, the stringers 11 of the main structure 10 are in a vertical position, between which the rungs 12 are arranged in a horizontal position and preferably spaced equidistantly apart from each other. As can be seen in the embodiment illustrated in FIGS. 2 and 3, the beams 11 are partially curved and configured so that the convex faces of both beams are facing each other. This arrangement causes the width of the ladder to be inversely proportional to the height.

[0027] As can be seen in the figures, the stringers 11 and rungs 12 have a channel shape or straight U-shaped profile. In addition, these are joined together by rivets 14 and additionally through gussets 15 (FIGS. 2 and 3). Preferably, each rung 12 is attached to the beams by means of two pairs of gussets 15, each pair attaching the front and rear edge of the step to the front and rear edge of each beam 11, respectively. According to the illustrated embodiment, the gussets 15 are arranged inside the profile of the beams 11 and steps 12, being connected to them by rivets 13.

[0028] As can be seen in more detail in FIG. 5, the upper platform 13 comprises 5 faces: a horizontal upper face and 2 side faces, a rear face, and a front face that are vertical. The side faces of the upper platform 13 have a hole 16, which is configured to receive the support leg 20. To do this, the support leg 20 comprises a pair of plates 21 at its upper end, preferably welded to each side of the tube 22, which, in turn, are joined at their upper end to a horizontal cylinder pin 23 that crosses the support leg tube and whose ends are configured to receive a bolt that is inserted into each hole 16 of the upper platform 13, resulting in a swivel joint, as indicated by the arrow in FIG. 5. For its part, the rear vertical face of the platform comprises a notch or slot 24 preferably of quadrilateral shape, which is aligned with the upper end of the tube 22 and has a height such as to only allow the upper face of said tube to adopt a maximum 90° position with respect to said rear vertical face.

[0029] Proceeding with FIG. 6, it is shown that the plates 21 preferably have a trapezoidal shape, while at the lower end of the support leg 20 there is a gripping element 25, which has a preferably convex curved shape with at least 4 vertices or points of support with the ground. The convex curved shape of the gripping element gives a high resistance, and therefore long durability, to this element that generally works subjected to compression and bending stresses. Secondly, such a shape is suitable for providing a good grip on the ground, especially on land such as soil, mud, stones, or branches, which is where harvesting ladders are usually used.