Stationary training equipment Part 4: Strength training benches, additional specific safety requirements and test methods (ISO 20957-4:2016)
4. Classification
The classification shall be according to ISO 20957-1.
5 Safety requirements
5.1 General
Depending on the design of the training equipment, the following requirements shall apply as appropriate.
5.2 Benches with fixed barbell supports
5.2.1 Stability of the barbell
Overturning of the barbell by an unequal load shall be prevented either by the distance between the supports or safety device. Test in accordance with 6.2.
5.2.2 Lateral stability of benches with fixed barbell supports
Benches with fixed barbell supports shall be stable when loaded with unequal load at right angles to the longitudinal axis.Test in accordance with 6.3.
5.2.3 Longitudinal stability of benches with fixed barbell supports
Benches with fixed barbell supports shall be stable in the longitudinal direction with respect to the bench.Test in accordance with 6.4.
5.3 Free-standing barbell supports
Free-standing barbell supports shall have a device for connecting to the ground. Test in accordance with 6.1.2.
5.4 Dimensions of the barbell support
The front part of the support (yoke), when measured with a (30 ± 1) mm diameter bar, shall have a vertical height of 20 mm to 40 mm (see footnote a in Figure 1) above the lowest point of the resting bar and the rear part shall be ≥80 mm higher than the top of the front of the support (yoke) (see Figure 1).Test in accordance with 6.1.1.
Figure 1 — Dimensions of the barbell support
5.5 Barbell support strength and stability
The rear part of the barbell support shall absorb the loads without breakage, shall not tip over and shall still function as intended by the manufacturer, when subjected to a non-symmetric barbell impact.Test in accordance with 6.5.
5.6 Loading
For benches classes H, S and I, the intrinsic and extrinsic loading shall comply with ISO 20957-1.
5.7 Barbell support
Any part of the equipment intended to support free weights shall be easily accessible to the user while accepting or replacing the barbell. Test in accordance with 6.1.3.
6 Test methods
6.1 General
6.1.1 Dimensional check
The measurement shall be done with appropriate measurement devices.
6.1.2 Visual examination
The visual examination shall be done under proper lighting.
6.1.3 Performance test
The tested mechanism shall be actuated as intended by the manufacturer.
6.2 Testing of rotational stability of the barbell
A solid steel bar which is (1 600 ± 50) mm long and has a diameter of (27,5 ± 1) mm shall be placed centrally on the barbell supports. If the bench is designed for use with an Olympic size steel bar, use an Olympic steel bar of (2 200 ± 50) mm instead of the (1 600 ± 50) mm steel bar. Then one weight disk of
a) 10 kg for class H, and b) 20 kg for class S
shall be placed on one side of the steel bar with mid-plane of the disk positioned according to Figure 2.
6.3 Testing of rotational stability of benches with fixed barbell supports
Test in accordance with 6.2, but with the barbell fixed and
a) with half of the maximum training load specified by the manufacturer, or
b) with 40 kg for class H and 50 kg for classes S and I, whichever is greater.
6.4 Testing of longitudinal stability
The bench shall be positioned on a 10° slope with the bench oriented such that the barbell support is at the lower end on the slope and the barbell support shall be set to the highest position (see Figure 3). A barbell loaded in accordance with the maximum load as specified by the manufacturer, or 50 kg, whichever is greater, shall be placed on the barbell supports.
6.5 Testing of barbell support strength and stability
Construct a test apparatus in a form of inverted (850 ± 5) mm long pendulum that supports the barbell above the bench or seat and is designed and configured so that when released, the load pivots backwards and strikes only one side of the barbell support at a time at a point (40 ± 5) mm down from the uppermost end of the barbell support from a distance of (300 ± 5) mm. If a bench is attached to the barbell supports, a weight equal to the maximum body weight as specified by the manufacturer shall be distributed evenly over the bench (see Figure 4).
Load the barbell with
a) half of the maximum training load specified by the manufacturer, or
b) 40 kg for class H and 50 kg for classes S and I, whichever is greater.
NOTE The overall height of the testing device can be varied to achieve the impact location and maintain the pendulum length.
During the test, the training bench shall not be clamped to the ground but a stopper shall be placed against the feet to prevent slipping. Repeat the test procedure 10 times for each side.
7 Test report
The test report shall include at least the information according to ISO 20957-1 and reference to this document, i.e. ISO 20957-4, and ISO 20957-1.
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