California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 4 - Construction Safety Orders
Article 14 - Construction Hoists
Section 1604.22 - Driving Machines, Sheaves, and Drums
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Type of Driving Machines.
Driving machines shall be powered by electric or hydraulic motors. Hydraulic units, where used shall be electrically driven. The hydraulic drive shall consist of an oil storage tank, a hydraulic pump and a hydraulic motor brake and shall conform to the following requirements:
(b) Winding Drums.
Winding-drum machines may be used irrespective of car travel provided that the drums are grooved for hoisting wire rope. Grooves shall be machine-finished and shall be of the helical or parallel type.
If drums are equipped with helical grooving, only one layer of rope shall be permitted on the drum. If drums are equipped with parallel grooving, (LeBus System, or the equivalent) more than one, but not more than four, layers of rope shall be permitted on the drum.
(c) Car Speed.
The car speed for all drives shall not exceed 600 feet per minute.
(d) Diameter of Drums and Sheaves.
Driving sheaves and drums shall have a pitch diameter of not less than forty times the diameter of the hoisting wire rope. Overhead and deflector sheaves shall have a diameter of not less than thirty times the rope diameter.
EXCEPTION: Where 8 x 19 wire hoist rope is used on machines existing at the time of the effective date of these Orders, sheaves and drums may have a diameter of not less than 32 times the rope diameter.
(e) Worms and Worm Gears.
Worms and worm gears, where used in the drive machine, shall be of steel and bronze, respectively.
(f) Friction Gearing and Clutches.
Friction gearing or clutch mechanisms shall be prohibited.
(g) Brakes.
The driving machine shall be equipped with a friction brake applied by a spring or by gravity and released electrically or hydraulically. The brake shall be designed to have a capacity sufficient to stop and hold the car at rest at 125% of its rated load.
(h) Rack and Pinion Drive.
The rack and pinion drive shall consist of one or more power-driven rotating pinions mounted on the car and arranged to travel on a stationary vertical rack mounted on the hoist structure. The drive shall have at least one pinion, one rack, and two backup rollers. The pinions and rack shall be of steel and shall comply with the following standards of the American Gear Manufacturing Association: AGMA 210.22, AGMA 220.02, and AGMA 240.01. Driving machines located within the car shall be fully enclosed with solid or open metal and if in a cabinet, the cabinet shall be locked.
(i) Factors of Safety.
The factor of safety to be used in the design of driving machines and in the design of sheaves used with hoisting and compensating ropes shall be not less than the following:
The load to be used in determining the factor of safety shall be the resultant of the maximum tensions in the ropes leading from the sheave or drum with car at rest and with rated load in the car.