GN 1424 Telescopic Slides with Full Extension and Dampened Self-Retracting Mechanism, Load Capacity up to 750 N

For the said loading forces F_S to be absorbed reliably in the surrounding structure, all available countersunk holes of the outer and inner slide must be used. Failure to use fastening screws reduces the specified load capacity accordingly. The following screws can be used for mounting:

Designation - standard
Hexagon socket countersunk head screw DIN 7991
Countersunk screw, Phillips DIN 965
Countersunk screw, Phillips DIN 7997

Outer slide
M 5
M 5
Size 5

Inner slide
M 4
M 4
Size 4 / 4,5

The rubber stops of type B dampen the impact of the slide in the respective end position. This feature minimizes noise development and increases the lifespan. Attached to the slides in a partially concealed, partially visible manner, the stops meet each of the requirements in regard to shape, material, and hardness.
If larger static or dynamic loads occur in the direction of extension, they should be absorbed by external stop elements.

Telescopic slides GN 1424 have a dampened self-retracting mechanism, which is also called “soft-close”. The dampened self-retracting mechanism is divided into two main functions and offers the best possible ease of use on closing the extension.

The self-retracting mechanism takes over the automatic retraction of the slides on the last 40 mm of stroke in the back stop position, where the slides are held in place accordingly. The retraction force is about 35 newtons per slide pair. Also, the dampening mechanism slows down to a considerably reduced speed the closing movement on the said stroke. An extremely smooth and gentle closing movement is achieved. This retraction force has to be overcome accordingly on opening the extension.

The dampened self-retracting mechanism is designed for loads weighing up to 75 kg based on 60,000 cycles (LGA standard). Proper use, including the reduction of the stroke speed to no more than 0.15 m/s on reaching the retraction mechanism, as well as compliance with the load values are required.

The maximum load capacity of telescopic slides depends on the slide profile, the nominal length l₁, and the resulting stroke l₂. Furthermore, the extension width, the slide materials used, and the parts of the component options, such as the dampened self-retracting mechanism, have a considerable influence.
The information on the maximum load capacity of the telescopic slides was determined in fatigue tests under the following conditions:

• Slide arrangement vertical in pairs
• Observance of all mounting information
• Warp-resistant test set-up
• Equal distribution of the load F_S throughout the extension finish
• Standard slide spacing of 450 mm
• 10,000, 50,000 or 100,000 test cycles
  (one extraction and retraction = one cycle)
• Gradual increasing of load

Wear, performance, and maximum bending were assessed after every test segment.