AS ISO 20957.4-2021 pdf free download – Stationary training equipment Part 4: Strength training benches, additional specific safety requirements and test methods.
This document specifies safety requirements for stationary strength training benches and free-standing barbell racks in addition to the general safety requirements of lSo 20957-1.lt is intended to beread in conjunction with lSO 20957-1.
This document is applicable to stationary training equipment type benches (type 4) (hereinafterreferred to as benches) with the classes S,H and I according to Iso 20957-1.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 20957-1,Stationary training equipment —Part 1:General safety requirements and test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISo 20957-1 apply.
lSO and IEC maintain terminological databases for use in standardization at the following addresses:-IEC Electropedia: available at http://www.electropedia.org/
– ISO Online browsing platform: available at http: // www.org/obp
4Classification
The classification shall be according to lSO 20957-1.
5Safety requirements
5.1General
Depending on the design of the training equipment, the following requirements shall apply asappropriate.
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 thesupports 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 tothe 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 respectto 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 avertical height of 20 mm to 40 mm (see footnote a in Figure 1) above the lowest point of the resting barand the rear part shall be 280 mm higher than the top of the front of the support(yoke) (see Figure 1).
Test in accordance with 6.1.1.
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 shallstill 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 , the intrinsic and extrinsic loading shall comply with lSO 20957-1.
5.7Barbell support
Any part of the equipment intended to support free weights shall be easily accessible to the user whileaccepting or replacing the barbell.
Test in accordance with 6.1.3.
6 Test methods
6.1General
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.6.2Testing 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 placedcentrally on the barbell supports. If the bench is designed for use with an Olympic size steel bar, use anOlympic steel bar of (2 200主 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.AS ISO 20957.4 pdf download.