SPECIFICATION
HOISTS AND CRANES |
| MANUALLY OPERATED CHAIN HOIST |
MODEL M3CB
Page 1 of 2
1.0Scope
1.1To define the requirements for hand chain manually operated chain hoists.
2.0Codes and Standards
2.1ASME B30.16 “Overhead Hoists (Underhung)”
2.2ASME
2.3JIS B 8802 “Manually Operated Chain Hoists”
3.0Design
3.1The hand chain manually operated chain hoists shall be model M3CB as supplied by Harrington Hoists, Inc. The hoists shall be rated ½ US Ton through 5 US Ton.
3.2The hand chain manually operated chain hoists shall meet the design and construction criteria of paragraph 2.1 above.
3.3The hand chain manually operated chain hoists shall employ a split load double reduction spur gear transmission.
3.4The hand chain manually operated chain hoists shall be equipped with a dry Weston type mechanical load brake that incorporates two redundant pawls, four braking surfaces, and
3.5The hand chain manually operated chain hoists shall be equipped with Grade 100 load chain.
3.6The hand chain manually operated chain hoists shall be equipped with hooks that are drop forged from carbon steel, and which are designed for ductile mode failure upon overload. The hooks shall have measurement nubs to facilitate inspection measurements. The hooks shall be equipped with spring loaded latch type throat closures. The bottom hook shall be designed for 360 degree swivel.
3.7The hand chain manually operated chain hoists shall have a single fall of load chain for capacities 3 US Tons and below.
3.8The hand chain manually operated chain hoists shall be equipped with two contoured chain guides that are tucked into the hoist body where they are out of the way and free from potential interference.
3.9The hand chain manually operated chain hoists shall be have a load sheave with at least four pockets for the load chain. It shall be equipped with a stripping device that keeps the load sheave free of debris.
GENERAL USE
EDOC0184
Rev. 0
March 14, 2001