| Access Plate |
A removable cover to provide access to operating parts. |
| Actuator |
A device for converting potential energy into mechanical energy. |
| Air/Hydraulic |
A system, which uses compressed air to run hydraulic pumps. |
| Angular Creep |
Extremely slow speed movement of a tilter that is the result of normal
leakage of fluid control valves. |
| Angular Travel |
The angular difference between the two tilting travel limits of the platform
deck or forks, expressed in degrees. |
| Approach Ramp |
A rigid structure to span a gap between the floor and a platform. |
| Authorized Person |
Trained or qualified personnel approved or assigned to perform a specific
duty or duties (see Qualified person or Trained person). |
| Automatic Landing Gate |
A landing gate that automatically opens or closes, respectively, as a
lift platform arrives at or departs from subject landing. |
| Axle Load |
The dynamic load on the edge of a lift platform when a wheeled vehicle
is rolled on. |
| B20.1 |
ASME Standard for Conveyors (VRC's) |
| Bearing |
Normally a low-friction needle roller or ball lined support for a rotating
shaft. |
| Bellows Guards |
Fabric-like accordion skirting to enclose under the base and legs. |
| Bevel Toeguards |
Platform sides slanted inwardly at an angle of approximately 30 degrees
from vertical in order to eliminate shear edges (commonly used in pit-mounted
installations). |
| Bleed-Off |
Diversion of pressurized hydraulic fluid back to reservoir. |
| Bushing |
The lining of an inside surface to reduce friction. |
| By-Pass |
An alternative passage for fluid flow. |
| CO |
Customer Order |
| CS-202-56 |
Commercial Standard (-56=1956) |
| CSM |
Customer Supplied Material |
| CTD |
Cumulative Trauma Disorders |
| Cam Follower |
A hi-capacity roller bearing used to carry or guide load. |
| Center of Gravity |
The point at which a mass can be supported, in any position, and remain
in equilibrium without tipping. |
| Check Valve |
A valve that allows fluid flow in one direction only. |
| Circuit |
Interconnected components through which energy or signals flow. |
| Clevis |
A structural mounting device to support a pin (i.e. used in attaching
platform to legs). |
| Compressibility |
The change in volume of a fluid or solid when subjected to pressure. |
| Continuous Duty |
An electric motor rated to operate continuously. |
| Control Transformer |
An electrical device that changes the voltage of a circuit. |
| Control Voltage |
The voltage in the lift controls circuit. |
| Critical Components |
Those components whose absence or failure would cause the equipment, of
which they are a part, to become inadequate or unsafe for its specific purposes. |
| Cross Tube |
A welded structural cross member between the legs of a scissors lift used
to equalize loading between the legs. |
| Cycle |
For lift tables, one complete up and one complete down operation. |
| Cylinder |
A fluid vessel with piston and shaft that moves as fluid pressure increases
or decreases. |
| Cylinder, Double Acting |
A cylinder in which fluid force can be applied to either side of the piston. |
| Cylinder, Ram |
A cylinder in which the piston and shaft have the same diameter. |
| Cylinder, Single Acting |
A cylinder in which the fluid force can be applied to only one side of
the piston.
DC Direct Current (Electricity) |
| DHHS (or DHS) |
Department of Health and Human Services |
| Displacement |
The volume of fluid a pump moves in one cycle. The volume of fluid in
a cylinder at full stroke. |
| Dock Lift |
A lift whose travel is generally 5 feet or less and which is used to load/unload
material from trucks and transfer it to dock or ground elevation. |
| Down Valve |
A hydraulic control valve, which allow oil to return to the reservoir. |
| DU Bushing |
A pre-finished, high performance bushing used at the pivot points. |
| Ductile |
Describes material capable of sustaining not less than 5% elongation before
it fractures. |
| Dynamic Load |
A moving load. |
| Edge Load |
The load on a platform edge as a result of off-center loading. |
| Electric Toeguard (toe sensor) |
A contact device that stops the down travel of a lift table when an obstruction
is encountered. |
| Electric/Hydraulic |
A system which converts electric power to hydraulic power. |
| End/Side Axle Load Capacity |
The maximum amount of single axle load (in the case of rolling loads),
which may be applied to the loading edge of the platform (end or side) when
the lift is in its raised position. |
| End/Side Edge Load Capacity |
The maximum amount of static load that can be applied to the edge of platform
(end or side) when the lift is in any raised position. |
| FPM |
Feet Per Minute |
| Flow Control Valve |
A valve which controls the rate of flow of hydraulic fluid. |
| Flow Rate |
The volume of fluid passing through a pipe or hose at a given time. |
| Four-Way Valve |
A valve which can direct fluid flow in 4 directions. |
| Hinged Bridge/Throw-over Plate |
A hinged transition plate attached to the edge of the platform to provide
a bridge to a loading dock or truck bed. |
| Hydraulic Piping System |
The entire system of fluid conduits such as hose, pipe, tubing, etc. used
to transfer hydraulic fluid between various operating components of the
hydraulic systems such as pumps, valves, actuators, etc. |
| Interlock |
A device to prevent lift movement when a landing gate is not fully closed
and to prevent the landing gate from being opened unless the lift platform
is present at that landing. |
| Intermittent Duty |
An electric motor rating for part-time operation. |
| Jog |
To raise or lower the lift platform in short increments. |
| LSD |
Double Wide or Tandem Wide Scissors Lift |
| LSH |
Double Pantograph Scissors Lift |
| LST |
Double Long or Tandem Long Scissors Lift |
| LMPS |
Lift Manufacturers Product Section (MHI) |
| Landing |
A permanent working surface at a fixed elevation used for loading/unloading
a lift or tilter device |
| Landing Gate |
A gate to control personnel traffic at a landing. |
| Lift Table |
A scissors lift device used to raise, lower, stack, convey and/or transfer
material between two or more elevations and not limited to landings. |
| Lifting Capacity |
The rated load of a scissors lift applied as a uniformly distributed load |
| Limit Switch |
An electrical device, which by predetermined adjustment, limits the rotational
or linear movement of a mechanism. |
| MH29.1 |
ANSI Standard for Industrial Scissors Lifts |
| MH29.2 |
ANSI Standard for Industrial Tilters |
| MH30.1 |
ANSI Standard for Dock Levelers |
| Maintained (Contact) Control |
Mode of control where movement starts when the control device is actuated
and continues when the control device is released. Movement stops when either
an appropriate limit switch is actuated or the Emergency Stop button is
pressed. NOTE: Whenever a machine's control is maintained, an Emergency
Stop button must be supplied and located where it can be reached by the
operator. This applies when even a portion of a machine's operating sequence
includes maintained control. |
| Maintenance Chock |
A device used to mechanically support a lift or tilter in the up position
for maintenance. |
| Manual Control |
A control actuated by the operator, regardless of the means of actuation. |
| Manual Override |
A control that allows manual operation of an otherwise automatically controlled
device. |
| Momentary (Contact) Control |
Mode of control where movement starts when the control device is actuated
and stops when the control device is released (a.k.a. "Deadman"
control). |
| Motor |
A device which converts electrical energy into rotational mechanical force. |
| N |
Narrow or Narrowed Scissors Lift |
| NEC |
National Electrical Code |
| NFPA |
National Fire Prevention Association |
| NEMA |
Classification National Electrical Manufacturers Association Standard. |
| NIOSH |
National Institute for Occupational Safety and Health |
| ODP |
Open Drip Proof Motor |
| OSHA |
Occupational Safety and Health Administration |
| Operator |
Trained person controlling the movement of the lift. |
| PSF |
Pounds Per Square Foot |
| PSI |
Pounds Per Square Inch |
| Pantograph Leg Section |
The articulated support mechanism characterized by a single pivot axis
and commonly referred to as the scissors leg assembly. |
| Piston |
A cylindrically shaped part which fits within a cylinder and is actuated
by fluid pressure. |
| Platform Ends |
The edges of the platform that are perpendicular to the scissors leg.
The end dimension is considered the platform width. |
| Platform/Fork Length |
The platform or fork dimension as measured perpendicular to the hinged
edge (tilt axis). This is considered the side of the platform or fork. |
| Platform/Fork Width |
The platform or fork dimension as measured parallel to the hinged edge
(tilt axis). This is considered the end of the platform or fork. |
| Platform Sides |
The edges of the platform that are parallel to the scissors legs. The
side dimension is considered the platform length. |
| Pneumatic |
Relating to air or another gas. |
| Pneumatic Piping System |
The entire system of pneumatic conduits such as hose, pipe, tubing, etc.
utilized to transfer air or other gas between various operating components
of the pneumatic system such as pumps, valves, actuators, etc. |
| Point Load |
A concentrated load. |
| Poppet |
A check or one-way valve. |
| Pressure |
Force per unit of area, usually expressed as pounds per square inch (psi). |
Pressure Line |
The line carrying pressurized fluid from the pump to the cylinders. |
| Pump |
A device which causes a liquid to flow under pressure. It converts mechanical
force into hydraulic pressure. |
| Qualified Person |
A person, who by possession of a recognized degree, certificate, professional
standing, or skill, and who by knowledge, training and experience has demonstrated
the ability to deal with problems relating to the subject matter, the work
or the project. (See Authorized Person and Trained Person). |
| Quick Disconnect |
A means of rapidly connecting and disconnecting electric or hydraulic
lines. |
| RPM |
Revolutions Per Minute |
| Rated Capacity |
The maximum uniformly distributed load, which can be applied according
to the manufacturer's specification. |
| Rated Load |
The maximum capacity as specified by the equipment nameplate. |
| Relief Valve |
A valve that operates at the preset pressure to allow the escape of fluids. |
| Reservoir |
A vessel for storage of hydraulic fluid, which is not under pressure. |
| Return Line |
A line used to carry hydraulic fluid from the cylinders back to the reservoir. |
| Rollover Capacity |
The maximum amount of single-axle load, which may be rolled over, the
platform surface when the lift is in its fully closed position. |
| SAE |
Society of Automotive Engineers |
| SME |
Society of Manufacturing Engineers |
| Scissors Lift |
A raising/lowering device that is supported or stabilized by one or more
pantograph leg sections. |
| Semi-Live Portability |
A lift table with non-castered wheels at one end and a wheeled skid spotter
at the opposite end. |
| Shall |
The word "shall" is to be understood as mandatory. |
| Should |
The word "should" is to be understood as advisory. |
| Signal |
A command to or feedback from an actuator or sensor. |
| Single Acting Cylinder |
See Cylinder, Single Acting. |
| Static Load |
A stationary load. |
| Strength Factor |
The ratio of ultimate strength of a material to its design stress and
maximum rated capacity. |
| Stroke |
The length of travel of a piston or piston rod. |
| Strong Back |
A cross member on a scissors lift used to equalize loading between the
scissors legs. |
| Suction Line |
The hydraulic line from the reservoir to the pump inlet (suction side). |
| TEFC |
Totally Enclosed Fan Cooled Motor |
| TENV |
Totally Enclosed Non-Ventilated Motor |
| Throw-Over Plate |
See Hinged Bridge/Throw-Over Plate |
| Thrust Angle (Strong Back) |
A cross member on a scissors lift where the cylinder pushes on to create
the travel. |
| Torque |
Twisting force (expressed in inch pounds or foot pounds). |
| Trained Personnel |
Personnel who have been trained by a qualified person and have demonstrated
the ability to perform a particular function on or around a scissors lift
or tilter. (See Authorized Person and Qualified Person) |
| Trunnion |
See Strong Back or Thrust Angle. |
| Two-Way Valve |
A valve which can direct fluid flow in two directions. |
| UL |
Underwriters Laboratories (Inc.) |
| VRC |
Vertical Reciprocating Conveyor |
| Valve |
A device which directs and controls the pressure and flow rate of a fluid. |
| Velocity Fuse |
hydraulic valve which senses rapid increase in the speed of the fluid
(i.e. a break in a hydraulic line) and locks the fluid in the cylinder to
prevent the lift or tilter from falling. |
| Vertical Creep |
Extremely slow speed movement of a scissors lift that is the result of
normal, internal leakage of the fluid control valves. |
| Vertical Travel |
The difference between fully raised height of the platform deck and fully
lowered height of the platform deck. |
| Volume |
The three-dimension size of a space of chamber (cubic inches). The output
of a pump as expressed in gallons per minute (gpm) |
| W |
Wide or Widened Scissors Lift |
| Watt |
A measure of electrical energy (volts x amperes). |
| Wheel Chock |
A wedge-shaped device to prevent wheels from rolling. |