§ 47.377. Anchors.
(a) When the anchor head comes in contact with the belt terminal while in use, the terminal shall be not less than 1/4 inch thick.
(b) Anchors shall be forged and of the same material as the terminals. Anchors shall be of the twin or double headed type designed for attachment to window frames, mullions or masonry.
(c) The anchor heads shall be not less than 5/8 inch across the flat and 9/32 inch thick nor more than 3/4 inch across and 21/64 inch thick. The area of the neck of each anchor head shall be not less than the area of a 3/8 inch round.
(d) Anchors shall have 1/8 inch radius fillets at all places where diameters or other dimensions change. Wail flanges shall be not less than 1-1/4 inches in diameter.
(e) The space between the underside of the anchor head and the upperside of the flange or window frame shall be not less than 1/2 inch or more than 7/8 inch.
(f) Double anchor heads shall be spaced not less than two or more than three inch centers.
(g) The back face of anchors for installation in wood window frames or mullions shall be provided with at least two sharp lugs to prevent turning of the anchor after installation; other equally effective and approved methods may be used.
(h) The anchors on the building to which safety belts are fastened shall be installed at a point not less than 42 inches or more than 51 inches above the window sill.
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