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F.6.5.1 The Shoulder Harness Mounting Bar must:
a. Be a single piece of uncut, continuous, closed section steel tubing that meets F.3.2.1.k
b. Attach to the Main Hoop on both sides of the chassis
F.6.5.2 Bent Shoulder Harness Mounting Bars must:
a. Meet F.5.2.1 and F.5.2.2
b. Have bracing members attached at the bend(s) and to the Main Hoop.
Material for this Shoulder Harness Mounting Bar Bracing must meet F.3.2.1.l
The included angle in side view between the Shoulder Harness Bar and the braces must be no less than 30°.
Explanation
For context, the Shoulder Harness Mounting Bar (SHMB) is the bar that goes across the Main Hoop (in our case) which is used as the upper mounting point for the shoulder harness.
F.6.5.1 The Shoulder Harness Mounting Bar must:
a. Be a single piece of uncut, continuous, closed section steel tubing that meets F.3.2.1.k
b. Attach to the Main Hoop on both sides of the chassis
The SHMB is allowed to be a bent tube, but it has to be a single tube, which is closed section (i.e. continuous side walls) steel tubing meeting requirements outlined in F.3.2.1.k. You can't have multiple tubes welded together to make up this member. The SHMB also has to connect to the Main Hoop of the chassis on both sides of the chassis.
Closed section metal tubing
Open Section metal tubing
The SHMB connects to the Main Hoop on both sides of the chassis (pink circles)
F.6.5.2 Bent Shoulder Harness Mounting Bars must:
a. Meet F.5.2.1 and F.5.2.2
b. Have bracing members attached at the bend(s) and to the Main Hoop.
Material for this Shoulder Harness Mounting Bar Bracing must meet F.3.2.1.l
The included angle in side view between the Shoulder Harness Bar and the braces must be no less than 30°.
Bent SHMBs have to
a. meet F.5.2.1 and F.5.2.2 which are the rules reffering to how to properly bend tubes (i.e. no crimping or other issues that would compromise the structure of the bent part of the tube). This also is referring to the minimum bending diameter based on the tube diameter.
b. There has to be a brace member attached to the SHMB at the place where it bends, and this brace has to meet F.3.2.1.l material requirements. This brace also has to make an angle greater than 30 degrees in side view with the SHMB.
The image on the left shows our SHMB assembly (since we had bends in our SHMB( blue), we had to add braces (red). The image on the right is from our SES, and it shows how the angle between the SHMB and the SHMB brace is greater than 30 degrees, which is rules compliant.
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