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SPECIFICATION
MANUALLY OPERATED CHAIN HOIST
MODEL M3CB
Page 1 of 2
GENERAL USE
EDOC0184
Rev. 0
March 14, 2001
HOISTS AND CRANES
1.0 Scope
1.1 To define the requirements for hand chain manually operated chain hoists.
2.0 Codes and Standards
2.1 ASME B30.16 “Overhead Hoists (Underhung)”
2.2 ASME HST-2M “Performance Standard for Hand Chain Manually Operated
Chain Hoists”
2.3 JIS B 8802 “Manually Operated Chain Hoists”
3.0 Design
3.1 The 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.
3.2 The hand chain manually operated chain hoists shall meet the design and
construction criteria of paragraph 2.1 above.
3.3 The hand chain manually operated chain hoists shall employ a split load
double reduction spur gear transmission.
3.4 The 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 non-asbestos brake pads that resist humidity and
moisture. The brake shall be totally enclosed for protection from impact, dirt,
and moisture.
3.5 The hand chain manually operated chain hoists shall be equipped with Grade
100 load chain.
3.6 The 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.
3.7 The hand chain manually operated chain hoists shall have a single fall of load
chain for capacities 3 US Tons and below.
3.8 The 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.
3.9 The 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.