SPANMASTER TROLLEYS
The Spanmaster line of monorail trolleys has been designed with an eye first to quality and service- ability and secondly
to economy for the different capacities and service factors for which the various trolleys are designed and offered.
WHEELS: All wheels are made from high alloy forged steel. Treads are accurately machined and hardened to 425-480
Brinell.
BEARINGS: All trolley wheels are equipped with first quality precision ball bearings which are lubricated and sealed at
assembly. This feature eliminates the necessity for periodic checks and lubrication of the wheel bearings and assures
satisfactory bearing life even under adverse operating conditions. For special conditions where unusual factors are
present the wheel assemblies can be equipped with pressure lubrication fittings. Spanmaster wheel assemblies are
designed to permit replacing a bearing, if necessary, without having to replace the entire wheel, bearing and axle
assembly.
SIDE ROLLERS: Several of the heavier series of trolleys are available equipped with lubricated and sealed precision ball
bearing, heavy, heat treated side guide rollers. These side roller trolleys are generally recommended for use on high
speed, high service, power driven equipment. When used in this manner this type of trolley can materially extend the life
of the rail by eliminating the scuffing action of the wheel flanges on the edge of the rail. Where there are curves in the
system they also serve to guide the trolleys into and out of the curves when operating at high speeds.
TWO WHEEL TROLLEYS: It will be noted that each trolley series includes a two wheel trolley. These two wheel trolleys
are the basic assembly used to make up the various four wheel trolleys. They may also be used in pairs to mount on
carriers, racks, etc., and suitable fittings are shown for that purpose. These two wheel units must not be used singly to
carry a load since they will not operate properly if so used.
TROLLEY WHEEL MOUNTING
In the interest of easy installation and maintenance it is
highly desirable that trolley wheels be easily in- stalled
or removed while the trolley is on the rail. Spanmaster
trolleys are equipped with a unique feature which
permits this interchangeability of wheels without
removing the trolley from the rail. In the accompanying
sketch you will notice that there is a "Wheel Axle
Bushing" which fits the bore in the trolley yoke and also
accommodates the axle of the wheel assembly. This
bushing is prevented from slipping or turning by the
clamping bolt which also engages a notch in the bushing
to insure and maintain correct wheel gaging. To remove
a wheel with the trolley on the rail the hexagon nut and
lockwasher are removed from the axle and the clamping
bolt removed from the yoke. The bushing is then
withdrawn from the yoke bore as shown. With the axle
bushing removed the wheel axle will readily slip upward
thru the slot in the top of the yoke thus freeing the wheel
assembly from the trolley. Replacing the wheel simply
involves the above procedure in reverse. This
interchangeability of wheels is quick and simple and can
be accomplished without the use of any special tools or
devices.
DIMENSIONS ARE FOR ESTIMATING PURPOSES ONLY. REQUEST CERTIFICATION FOR CONSTRUCTION.
Copyright 1978
A DIVISION OF JERVIS B. WEBB COMPANY
Page 16.2
Jervis B. Webb co.
739 MOORE ROAD, AVON LAKE, OHIO 440121
0-1-80
