This type of equipment is the most
fundamental materials-handling aid available. The basic simplicity
permits easy adaptation for single-purpose application. Standard
catalogs indicate the wide variety available, often designed for
specific industries. However, custom design may be specified with
very little, if any, cost penalty.
Generally, floor trucks are described
as follows.
Two-Wheeled Hand Trucks.
Two-wheeled hand trucks (Fig. 4.39) are essentially levers on two
wheels. The axle connecting the wheels serves as the fulcrum of the
lever and carries up to 80 percent of the total load moved.
The two-wheeled cart is normally used
for short nonrepetitive moves of smaller loads over smooth floors.
Carts are generally 48 to 64 in (1.2 to 1.6 m) high, and are designed
to carry a variety of aterials in bags, barrels, bales, boxes, and
bins. Typical accessories include height extension, stair climbers,
safety brake, spread clamps, and straps.
Dollies. Dollies are
smaller-wheeled platforms upon which a load is placed for short
distance and intermittent moves. Typically, dollies are fitted with
caster-type wheels and are either pulled or pushed by an operator.
Factory Trucks. Factory trucks
(Fig. 4.40) are wheeled platforms or containers either moved by an
operator or towed by detachable power units.There is a wide variety
of devices in this group and an even wider variety of uses for
materials movement and as mobile storage.
The hand factory truck is hand-powered,
guided by the direction of the moving force, and closely related to
the dolly. Several wheel-arrangement patterns are available with
tradeoffs between maneuverability and stability.
The towed factory truck is connected to
the prime mover by a tow bar which provides the steering direction.
Both two-wheel and four-wheel steering are available on towed factory
trucks. Two-wheeled steering is generally the least expensive and
most commonplace. Because of the steering geometry involved, each
truck will follow a turn of shorter radius than the preceding
vehicle. As several of these units are connected in trains, the
continual tightening of turns requires more space for maneuvering.
The four-wheel-steered truck,
with properly adjusted steering, is capable of following the same
path as the vehicle in front of it. Where long trains are
economically justified and desirable, the four-wheel steered devices
may be used to minimize commitment of valuable manufacturing space to
aisles.
The Semilive Skid. The semilive
skid is a rectangular platform or box having two wheels on one end
and two fixed supports on the other. The end having the fixed
supports is also fitted with a heavy pickup pin to which a
two-wheeled jack is attached. The jack and handle are used as the
lifting device and tiller, allowing the skid to be maneuvered by the
operator.
Hydraulic-LiftTrucks. Hydraulic-lift
trucks (Fig. 4.41) are used for short distance moves at the
workplace. They generally range in capacity from 2500 to 8000 lb
(1130 to 3625 kg).These trucks require a minimum amount of
maintenance, and can last for 20 years.
The trucks can be equipped with a jack
like manually operated hydraulic lift or pedal operated system to
elevate a loaded pallet. Some units use an electrically driven
hydraulic system to lift, often above the maximum 5 in of the manual
system. These lift trucks generally use forks for lifting pallets or
platforms for special containers and positioning heavy loads.
1 comment:
There are different types of hand trucks are available in the market, whether it is two wheeler or four wheeler.All the information in above post are really good and informative as well.
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