- Part Number:1926
- Part Number Title:Safety and Health Regulations for Construction
- Subpart:1926 Subpart I
- Subpart Title:Tools - Hand and Power
- Standard Number:
- Title:Mechanical power-transmission apparatus.
- GPO Source:
"Prime-mover guards -"
"Flywheels." Flywheels located so that any part is 7 feet (2.128 m) or less above floor or platform shall be guarded in accordance with the requirements of this subparagraph:
"Cranks and connecting rods." Cranks and connecting rods, when exposed to contact, shall be guarded in accordance with paragraphs (m) and (n) of this section, or by a guardrail as described in paragraph (o)(5) of this section.
"Tail rods or extension piston rods." Tail rods or extension piston rods shall be guarded in accordance with paragraphs (m) and (o) of this section, or by a guardrail on sides and end, with a clearance of not less than 15 (38.1 cm) nor more than 20 inches (50.8 cm) when rod is fully extended.
"Guarding horizontal shafting."
"Guarding vertical and inclined shafting." Vertical and inclined shafting 7 feet (2.128 m) or less from floor or working platform, excepting maintenance runways, shall be enclosed with a stationary casing in accordance with requirements of paragraphs (m) and (o) of this section.
"Projecting shafts ends."
"Power-transmission apparatus located in basements." All mechanical power transmission apparatus located in basements, towers, and rooms used exclusively for power transmission equipment shall be guarded in accordance with this section, except that the requirements for safeguarding belts, pulleys, and shafting need not be complied with when the following requirements are met:
"Guarding." Pulleys, any parts of which are 7 feet (2.128 m) or less from the floor or working platform, shall be guarded in accordance with the standards specified in paragraphs (m) and (o) of this section. Pulleys serving as balance wheels (e.g., punch presses) on which the point of contact between belt and pulley is more than 6 ft. 6 in. (1.976 m) from the floor or platform may be guarded with a disk covering the spokes.
"Location of pulleys."
"Broken pulleys." Pulleys with cracks, or pieces broken out of rims, shall not be used.
"Pulley speeds." Pulleys intended to operate at rim speed in excess of manufacturers normal recommendations shall be specially designed and carefully balanced for the speed at which they are to operate.
"Belt, rope, and chain drives" -
"Horizontal belts and ropes."
"Overhead horizontal belts."
"Vertical and inclined belts."
"Vertical belts." Vertical belts running over a lower pulley more than 7 feet (2.128 m) above floor or platform shall be guarded at the bottom in the same manner as horizontal overhead belts, if conditions are as stated in paragraphs (e)(2)(ii)(a) and (c) of this section.
"Gears, sprockets, and chains" -
"Gears." Gears shall be guarded in accordance with one of the following methods:
"Hand-operated gears." Paragraph (f)(1) of this section does not apply to hand-operated gears used only to adjust machine parts and which do not continue to move after hand power is removed. However, the guarding of these gears is highly recommended.
"Sprockets and chains." All sprocket wheels and chains shall be enclosed unless they are more than 7 feet (2.128 m) above the floor or platform. Where the drive extends over other machine or working areas, protection against falling shall be provided. This subparagraph does not apply to manually operated sprockets.
"Openings for oiling." When frequent oiling must be done, openings with hinged or sliding self-closing covers shall be provided. All points not readily accessible shall have oil feed tubes if lubricant is to be added while machinery is in motion.
"Guarding friction drives." The driving point of all friction drives when exposed to contact shall be guarded, all arm or spoke friction drives and all web friction drives with holes in the web shall be entirely enclosed, and all projecting belts on friction drives where exposed to contact shall be guarded.
"Keys, setscrews, and other projections."
"Collars and couplings" -
"Collars." All revolving collars, including split collars, shall be cylindrical, and screws or bolts used in collars shall not project beyond the largest periphery of the collar.
"Couplings." Shall couplings shall be so constructed as to present no hazard from bolts, nuts, setscrews will, however, be permitted where they are covered with safety sleeves or where they are used parallel with the shafting and are countersunk or else do not extend beyond the flange of the coupling.
"Bearings and facilities for oiling." All drip cups and pans shall be securely fastened.
"Guarding of clutches, cutoff couplings, and clutch pulleys" -
"Guards." Clutches, cutoff couplings, or clutch pulleys having projecting parts, where such clutches are located 7 feet (2.128 m) or less above the floor or working platform, shall be enclosed by a stationary guard constructed in accordance with this section. A "U" type guard is permissible.
"Engine rooms." In engine rooms a guardrail, preferably with toeboard, may be used instead of the guard required by paragraph (k)(1) of this section, provided such a room is occupied only by engine room attendants.
"Belt shifters, clutches, shippers, poles, perches, and fasteners" -
"Belt shippers and shipper poles." The use of belt poles as substitutes for mechanical shifter is not recommended.
"Belt perches." Where loose pulleys or idlers are not practicable, belt perches in form of brackets, rollers, etc., shall be used to keep idle belts away from the shafts.
"Belt fasteners." Belts which of necessity must be shifted by hand and belts within 7 feet (2.128 m) of the floor or working platform which are not guarded in accordance with this section shall not be fastened with metal in any case, nor with any other fastening which by construction or wear will constitute an accident hazard.
"Standard guards - general requirements" -
"Methods of manufacturer."
"Approved materials" -
"Minimum requirements." The materials and dimensions specified in this paragraph shall apply to all guards, except horizontal overhead belts, rope, cable, or chain guards more than 7 feet (2.128 m) above floor, or platform.
"Guards for horizontal overhead belts."
"Guards for horizontal overhead rope and chain drives." Overhead-rope and chain-drive guard construction shall conform to the rules for overhead-belt guard.
"Guardrails and toeboards."
"Care of equipment" -
"General." All power-transmission equipment shall be inspected at intervals not exceeding 60 days and be kept in good working condition at all times.
"Bearings." Bearings shall be kept in alignment and properly adjusted.
"Hangers." Hangers shall be inspected to make certain that all supporting bolts and screws are tight and that supports of hanger boxes are adjusted properly.
"Care of belts."
"Lubrication." The regular oilers shall wear tight-fitting clothing. Machinery shall be oiled when not in motion, wherever possible.
[58 FR 35176, June 30, 1993; 69 FR 31882, June 8, 2004]