C0044-A Fully Automated Cornell Type Tester

Product details

The Cornell Type Tester has been designed and manufactured for testing and evaluating 

of Innerspring and Boxspring mattresses.  

There are several different methods used for the evaluation of innersprings and boxsprings, 

testing for measurements regarding firmness, firmness retention, durability, effect of impact etc.

The Fully Automated Cornell Type Tester is used with minimal operator assistance to test the 

long term capacity of bedding to resist cyclic loading. The machine consists of a double 

hemispherical ram head on a manually adjustable shaft. A load cell is located on the ram 

head to measure the force being applied to the mattress.  

The shaft is connected to an adjustable eccentric which is rotated by an electric motor at 

up to 160 cycles per minute, variable.

The bedding is located below the ram, and the eccentric and shaft position adjusted so that 

the maximum load of 1025N and the minimum load of 22N is applied when the eccentric is 

rotated to the lowest and highest positions respectively. A position transducer is located so 

the position of the ram head can be measured automatically.

The eccentric is then rotated slowly, raising and lowering the ram head so that the load/

position data can be recorded for a few cycles. The mattress firmness is calculated from 

the load readings between 75mm and 100mm respectively.

This procedure is performed at the start of the test and the subsequently at the end of 

each of seven stages. These stages are reached when 200, 6,000, 12,500, 25,000, 50,000,

 75,000 and 100,000 cycles have been completed at 160 cycles per minute. The duration of 

the cyclic testing will take nearly 10.5 hours, simulating 10 years of mattress use.

At the end of each stage, the position of the ram head is noted when a load of 22N is applied 

to the mattress. A change from the previous static reading is referred to as a dimple and this is 

recorded. 

An operator prompting computer program measures both the load and ram head position from 

the two transducers throughout the total test stages and produces a full test report upon completion.

Applications:
• Box Spring Mattresses
• Innerspring Mattresses
• Foam Mattresses

Features: