Fire escape – ladder – or scaffold – Safety device for ground-supported ladder
Patent
1983-10-12
1985-01-01
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Safety device for ground-supported ladder
182214, E06C 748
Patent
active
044911920
DESCRIPTION:
BRIEF SUMMARY
This invention relates to ladder safety devices.
A variety of ladder safety devices have been produced which can be secured to the upper ends of ladder uprights to spread the load imposed by the ladder upon the wall or other vertical surface against which the ladder is rested, and to reduce the risk of the ladder sliding or tipping. Such devices are usually formed of the same materials as conventional ladders, that is to say aluminium or wood, and are bulky and inconvenient to store. They require to be screwed, clamped or otherwise secured to the ladder before each use and this is time-consuming.
It is an object of this invention to provide an improved ladder safety device which can be fitted to a ladder simply and quickly and which is lightweight and of low stored bulk.
Accordingly, the present invention consists in a ladder safety device having at least two elongate members cooperating telescopically, there being apertures formed in the members which can be brought into register on telescopic extension of the members to receive the ends of ladder uprights so that the device may be located transversely across the top of a ladder.
Preferably, the elongate members comprise respective coaxial tubes.
Advantageously, the apertures are of differing sizes and can be brought into register at different relative locations of the members to receive ladder uprights at different separations.
Suitably, the device comprises a central and two other elongate members, the central member being formed with two spaced apertures and each other member being formed with one aperture towards one end thereof.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 shows a ladder safety device according to this invention in which the constituent parts have been separated for clarity of illustration,
FIG. 2 is a section of line 2--2 of FIG. 1,
FIG. 3 is a perspective view to a different scale showing the device of FIG. 1 positioned on a ladder,
FIG. 4 shows the device of FIG. 1 in a storage position,
FIG. 5a and b show a further embodiment of this invention in two different orientations, and
FIG. 6 is a cross section through part of yet a further embodiment of this invention.
Referring to FIGS. 1 and 2, the device can be seen to comprise outer, middle, and inner rigid plastics tubes shown at 10, 12 and 14 respectively. The inside and outside dimensions of these tubes are chosen so that the middle tube 12 is a sliding fit within the outer tube 10 and the inner tube 14 a sliding fit within the middle tube 12. The middle tube 12 is formed, toward each end, with a rectangular aperture 16. The separation between the two apertures 16 is selected to correspond with the separation of the uprights in the ladder with which the device is to be used. The width of the apertures is slightly greater than the width of the ladder uprights. The outer and inner tubes both have, at the respective end adjacent the middle tube, a similarly sized aperture 18.
At the end of the outer tube remote from the middle tube, there is provided an end cap 20 having an integral plug 21 which is a push fit in the end of the tube. At the opposite end of the outer tube there is provided a ring 22 having the same external diameter as the cap 21. A similar ring 23 is provided at the end of the middle tube remote from the outer tube and a cap 24 is mounted through plug 25 at the free end of the inner tube.
When the device is assembled, the ends of the free tubes are engaged so that they may telescope one into another. In the storage position, shown in FIG. 4, the tubes can be seen to be fully retracted with the inner and middle tubes being substantially wholly contained within the outer tube. Before using the device, the tubes are telescopically extended until each aperture 16 of the middle tube is in register with the corresponding aperture 18 in the inner or outer tube as the case may be. The device can then be located at the top of the ladder as shown in FIG. 3 with the ends of the ladder uprights being received
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patent: 4440263 (1984-04-01), Smith
Machado Reinaldo P.
Skilten Tools Limited
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