There are many ladder safety devices on the market today and I am going to have a look at some of them and give my opinion as to their merits
First, I will look at the ladder stand-off as it is one of the most common designs. The stand-off is good for the purpose it was designed for. It fits to the upper section of the ladder and holds the ladder off the working surface to allow the ladder user to complete tasks like painting fascias or cleaning gutters without having the ladder touching the working surface. The stand-offs on the market vary considerably in size and quality but the one thing they all have in common is the fact that they are quite large and cumbersome. They would not be easily stored and would either have to be bolted to the ladder or be attached by hooks and springs. The latter I find to be too loose when attached as they move considerably on the ladder, giving a feeling of insecurity. Of course, this is only my opinion, some people find them great and others don't, as the quotes below, from various sources, show.
'I attached it to my ladder and gave it a test run. I immediately found out that it was useless for my purposes because the arms were not deep enough to touch the roof, and the ladder still rested on the gutter. I took it back to the shop'.
'I am a bit disappointed because of several small problems. It's stamped galvanized steel with many sharp edges, and doesn't fit my ladder very well so it can move side to side on the rungs'.
In the stand-off with the hook and spring configuration, the hooks hook over the ladder rungs and the spring also has a hook which hooks over the rungs. This configuration does not fix solid, so allows the device to move from side to side on the ladder rungs. Stand-offs, in my opinion, can often hold the ladder too far off the working surface, giving the potential for the ladder to flip- rotate. If the user climbs too close to the stand-off, there is also the potential for the weight to cantilever at the point of the stand-off and, therefore, the bottom of the ladder could kick out.
Ladder safety devices "Ladder Grips"
Ladder Grips are a unique new safety device that can give a ladder 350% more stability.
Even on a slippery surface like a stainless steel bar, with their pads locked parallel to the ladder stile, the Ladder Grips will give you maximum performance.
Ladder Grips can reduce the chance of ladder rotation because their surface area is greater than the surface of the ladder stile at the point of contact. Ladder Grips can reduce the risk of the bottom of your ladder slipping because if the top is secured, the bottom is unlikely to move and they can prevent the top of your ladder slipping by as much as 350% - proven under test conditions.
They are small, strong and robust, easy to use, can be fitted in seconds and fit into a small tool box. They have non-marking rubber pads and no tools or bolts are required. Put simply, size for size, Ladder Grips provide more stability and versatility than any other ladder safety device.
Ladder Grips can be easily secured to the ladder independently of each other, thus allowing for working on slopes such as a gable end. Ladder Grips have been tested with the simulation of a man's weight = 96kg. The tests concluded that the Grips provided 350% more stability in terms of ladder slip resistance .
Mechanical Testing on Ladder Grips
1 Ladder against wall no grips and no weights = slip load of 3.5 Kg
2 Ladder against wall with grips and no weights = slip load of 7.5 Kg
3 Ladder against wall no grips and weight of 96.6 Kg = slip load of 17.4 Kg
4 Ladder against wall with grips and weight of 96.6 Kg = slip load of 61 Kg
5 Shear strength of on pivot pin = 1193.6 Kg
6 Tensile test on screw = 1610.6 Kg
7 Shear test on rubber pad = 319 Kg
8 Tensile weld test = 993.8 Kg
9 Compression weld test = 33.5 Kg
- Ladder put against wall of 2.5 meters and 800 mm out from wall.
- Only 50% of the rubber grip in contact with wall during the slip tests.
- The weight of 96.6 Kg is to simulate a human being on the ladders.
- The pivot pins that were tested were of a silver steel composition similar in type to the original.
- The screw was fitted to adaptors to hold it in place in the test machine which had matching threads.
- The rubber pad that was tested did not shear - it broke. This is due to difference in bonding technique (or amount of glue used).The tests on the spot weld were done until the steel frame bent or became compromised.
Ladder Grips are designed, developed, manufactured and tested in the UK.