BACKGROUND OF THE INVENTION

The use of ladders for outdoor work is related with increased risk of accidents. One of the most frequent causes of accidents with ladders is the sliding of the ladder at the top end.

Agricultural insurance companies, for example, no longer cover the consequences of accidents when picking fruit with ladders due to excessive numbers of cases. In the case of accidents involving the use of ladders during outdoor work on construction sites, investigations into compliance with safety precautions have become so meticulous that the majority of claims for compensation can be rejected.

This leads to the increased use of cost-intensive lifting platforms or greater effort in securing standing ladders with temporary fixings or by staff.

STATE OF THE ART

US 4924,971 describes a hook-in safety device for securing a ladder to a gutter. The use on masts, house corners, windows or smooth walls cannot be secured with this device.

AT 511 459 B1 treats a securing bracket for fixing to a rung ladder which rests against a gutter, wall cover, window sill or similar when the rung ladder is leaning against it. The use on masts, house corners or smooth walls cannot be secured with this.

The device disclosed in DE 4034431 A 1 contains a ladder with brackets that can be moved up along a threaded shaft on both sides of a round structure, e.g. a mast or a tree. Even if the attachment to a mast is solved here, it is a solution for this application only. The use at house corners is limited, it cannot be used on windows or smooth walls.

TASK OF THE INVENTION

The object of the here disclosed invention is to secure a ladder to a vertical round or square structure, a window or a corner of a building without stepping on the ladder. SOLUTION

This is achieved by fiting a device on top of a ladder with opposing, curved, interchangeable locking arms that can interlock.

The locking arms can be used to enclose a vertical structure or be atached to corners of buildings or other vertical structures.

By interlocking, it is possible to press the locking arms into window reveals, or to engage it to the interior space when windows or other cavities are open.

The locking arms are removable, can be used in various positions and have spherical profiled structures at their distal ends made of highly anti-slip material.

CLOSER DESC IPTION ALONG TO THE DRAWING

Fig. 1 shows the structure of the device (1), consisting of the sockets (4) and the interchangeable locking arms (2) inserted therein and the spherical structures (3) atached to the locking arms (2). The sockets (4) are inserted in a mechanism (7) with which the locking arms (2) can be moved.

The mechanisms (7) are atached to a connection (6) located between the uprights (5) of a ladder. At the transition between the mechanisms (7) there is a guide (8) which supports the centred positioning on structures. The mechanisms (7) are moved, locked and released via cable pulls (9, 10, 11).

Fig. 2 shows the application at a round structure (12)

Fig. 3 shows the application when wrapping a narrow round structure (13)

Fig. 4 shows the application when applying to a very wide round structure (13)

Fig. 5 shows the application when applied to a right-angled building corner (14)

Fig.6 shows the application when applied to a wide-angled building corner (15)

Fig. 7 shows the application when applied to a narrow-angled building corner (16)

Fig. 8 shows the application when resting against a window sill (18), whereby the interlocking locking arms (2) with the spherical structures (3) are pressed into the window reveal (17).