A power-driven conveyor is an assemblage of elements for moving
a load over a predetermined path or path section. The assemblage
generally includes a single frame structure mounting a power-driven
load-advancing means which is used to advance the load over the predetermined
path.
The load-advancing means may comprise either a single load-advancing
element or a group of like members acting as a single load-advancing
device. A group of like members may be considered as acting as
a single unit if they coact one with the other to effect movement
of the load, where said coaction occurs along the entire length of
said path or path section. Some other criteria which generally
indicate that a group of like members is acting as a single unit
are: a common frame structure supporting all the members; or a
drive means for all the members, with the elements being driven
at the same speed or over the same speed range. The above are merely certain
parameters that most groups acting as a single unit exhibit. As
with any rule or definition, there will be exceptions.
See the Glossary, below, for clarification and limitation of
the concepts of the terms Chute and Condition Responsive, applying
to the manner in which they are encountered in this class (193).
SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
ORGANIZATION OF THE CLASS
Perusal of the first-order (capitalized) titles of the schedule
will show that the class is composed of a relatively few major collections
of subclasses. Search fields are provided for special-purpose and
particular-function conveyors as well as for particular combinations
of conveyor structure and subcombinations of conveyor structure.
Generally, in order of superiority, the major collections provide
for the following search fields.
1. Conveyor on a vehicle (subclasses 300+) or for
people (subclasses 321+).
2. Selective conveyor (subclasses 348+).
3. Conveyors handling a specific article or specific group
of articles, including: (a) a conveyor "orienting" an
article (subclasses 667+); or (b) a system of conveyors
grouping plural articles into a group (subclasses 418+);
or (c) a system of conveyors conveying articles as a stream wherein
articles are successively arranges (subclasses 434+); or
(d) a system of conveyors conveying articles each as a separate
article (subclasses 463+).
4. Special conveyor or one having special features (subclasses
339+, 493+, 502.1, 506+, and 347).
5. Arrangement of plural conveyors of which (a) one conveyor
is not power-driven (subclasses 523+); and (b) all conveyors
are power-driven (subclasses 570+).
6. Methods of conveying (subclass 617).
7. Conveyor, per se, including subcombinations (subclasses
618+).
8. Stopping of a conveyor (subclasses 854+).
9.The frame or supporting structure for a conveyor (subclasses
860.1).
In some of the collections summarized above (step 3), the
disclosed intent of the claimed apparatus is significant and important.
Mechanisms that are apparently similar in structure are used for
different functions by modifying the arrangement or providing a
different adjunct to the structure.
See Subclass References to the Current Class, below, for subclasses
with apparently similar structure used for different functions.
Subclass 584 of this class (198) should be limited to a conveying
system composed of a plurality of sections which are joined to each
other by means allowing ready connection or disconnection of the
sections, said means further allowing the sections, to partake of
a pivotal motion relative to each other. Examples of the type of patent
which will be placed here are nonambulant articulated trains or
movable articulated trains which are connected to a stationary element
in the system.
LINE BETWEEN CLASS 198, CLASS 193, CLASS 226, CLASS 242, CLASS
414, AND CLASS 72
The conveyor, per se, is in Class 198. As between Class 193,
Conveyors, Chutes, Skids, Guides, and Ways; Class 198, Conveyors:
Power-Driven; Class 226, Advancing Material of Indeterminate Length;
Class 242, Winding, Tensioning, or Guiding; Class 294, Handling:
Hand and Hoist-Line Implements; Class 414, Material or Article Handling,
Class 72 is superior.
However, in the case of a subcombination for structure or
process wherein it is not clear from the claims whether handling
or deforming is involved, a reasonable interpretation of the total
disclosure will determine whether classification should be in Class
72, as a deforming subcombination. For example, a claim reciting
a "roller pair" may be considered as a feeding
subcombination in the absence of disclosure of deformation. On the
other hand, "a configured roller" will usually
be a deforming device unless it is feeding a correspondingly configured
workpiece. A claimed "pinch-roll couple" may be
disclosed (a) with many details showing its effectiveness as a feeder,
or (b) may be sparsely described as a deforming device and still
be clearly a deformer.
A patent including a claim involving both metal deforming
and work handling is classified in Class 72, unless both the following
criteria are met (a) there is no claim limited to deforming, per
se, and (b)the claims to handling and deforming recite deforming
by name only. Search subclasses 137.1+ for the combination
of a conveyor with provision to load or unload a buoyant vehicle.
LINE BETWEEN CLASS 241, CLASS 198, AND CLASS 83
See Class 241, Solid Material Comminution or Disintegration,
especially the various feeding and discharging subclasses, for comminutors
combined with power conveyors. See the Class 241 main class definition, "Material
Handling, Excavating, Distributing, Harvesting" for a statement
of the line. However, when such instrumentality is set forth with
structural specificity, the claimed congregation of elements is
properly placed with the work modifying instrumentality (Class 83).
For example: A claim reciting structurally defined work-handling
means (not claimed as synchronized with "work-modifying
means", or "tool", or "cutter",
or "punch", or "knife", etc.)
is properly placed in Class 198, on the basis of the work-handling
means. A claim reciting a power conveyor and, for instance, a work
station including "a reciprocating tool", or "a
tapered tool", or "a round cutter", or
a "rotary cutter", etc., is properly placed in
the class of the specified tool set forth.
In addition, Class 83, Cutting, receives patents for classification
therein which claim a cutting tool (of the type provided for in
Class 83) synchronized with, or in power transmitting relation with,
a work handling means, regardless of whether such tool is claimed
significantly or merely nominally.
See References to Other Classes, for various fields of search
for devices related to those in this class (198)
SECTION III - SUBCLASS REFERENCES TO THE CURRENT CLASS
384+, 393, 397, 404+, and 408
for an endlessly orbiting conveyor, either as one belt or chain
or as a plurality of connected components when used for orienting
articles.
for a control means responsive to a sensing means
when part of an orienting mechanism, and particularly for a reciprocating
or oscillating conveyor when part of a conveyor section.
most of the subclasses for a control means responsive
to a sensing means when used to control the operation of a group-forming
mechanism control of this operation is so much a part of grouping
that the control subclasses have not been specifically set out.
and 449+, particularly for an endlessly
orbiting conveyor, either as one belt or chain or as a plurality
of connected components when used in a stream-moving conveyor system.
particularly for an endlessly orbiting conveyor, either
as one belt or chain or as a plurality of connected components when
used to separate or convey a particular article.
particularly for an endlessly orbiting conveyor, either
as one belt or chain or as a plurality of connected components when
part of a structure to collect load from the ground.
particularly for an endlessly orbiting conveyor, either
as one belt or chain or as a plurality of connected components when
part of a system having a nonpower-driven conveyor; and particularly
for a rotating screw or helix when part of a system having a nonpower-driven
conveyor.
particularly for an endlessly orbiting conveyor, either
as one belt or chain or as a plurality of connected components when
part of a system having a nonpower-driven conveyor.
725+, 793+, and 804+,
particularly for an endlessly orbiting conveyor, either as one belt
or chain or as a plurality of connected components when part of
a conveyor section.
639, 718, 751, 794, and 810.1+, for a control means
responsive to a sensing means when part of a conveyor section each
noted subclass number is applicable to a different kind of conveyor section.
Drying and Gas or Vapor Contact With Solids, for conveyors claimed in combination with added means to
promote a drying action or contact of gases or vapors with solids
conveyed, and see
subclass 203 , Notes (2), (3) and (4).
Excavating, for conveyors particularly adapted for digging in
the earth. If no actual digging element, as teeth, wheel, plow,
scoop, or the like, is claimed, and if the conveyor is not particularly
adapted to trench, it is classified in this class (198). If other
operations are included, as a melting snow, classification is in Class
37. If the presence of a wagon to be loaded is essential to the
intended operation of the device, classification is in Class 414,
Material or Article Handling.
Harvesters,
subclasses 158+ for conveyors limited to use on harvesters. For
excavating and loading machines of the type having a scoop or a
rake delivering to an endless or rotary carrier, see Class 56, subclasses
344+. The line between conveyors of this type and harvesters of
the raking or loading type is that where tines, prongs, or the like
are the raking means and the apparatus is particularly designed
for raking up loose material while moving across a field, or if
it can be so used without modification, classification is in harvesters.
If the conveyor alone and not the raking conveyor is claimed, classification
is in the conveyor class.
Metal Deforming,
subclasses 199+ , and in particular subclasses 227+ and
250+, for a rolling mill having a conveyor to carry work
to the rolls or to manipulate or guide the work for proper shaping.
Cutting, the line between Class 198 and Class 83, Cutting,
is in concert with the general line which distinguishes Class 198
from other classes having a greater combination. That is, the claimed
recitation of a power-driven conveyor (or a power-driven work-feeding
means) in combination with a cutting instrumentality, in name only
or in nominal terms, with respect to which the work feed means may
move work, will not of itself exclude original placement of the
patent in Class 198. (Also see Lines With Other Classes, above for
the line between Class 83, and this class - 198).
Conveyors, Chutes, Skids, Guides, and Ways, for gravity conveyors. Power-driven conveyors combined
with gravity conveyors are classified in this class (198). See Subclass
References to the Current Class.
Foods and Beverages: Apparatus,
subclasses 360 through 366for a conveyor designed to receive food, a food
article or a beverage containing receptacle, and having a heat generator, a
heat exchanger, other means physically effecting the food or beverage
during the conveying, or an enclosure or tank having more than enough
structure for the operation of the conveyor.
Railways, for tracks or road beds with endless traction means which
are detachably connected to or which push the carrier or car, and
subclass 25 , for endless railways and moving sidewalks combined
with an endless railway.
Animal Husbandry,
subclasses 52.1+ , for the combinations of a source of supply, which
is disclosed as being feed for creatures of that class, a conveyor
for removing material therefrom, and a receiver in the form of a
receptacle (trough, bank, etc.) or surface in or upon which the
feed is placed for consumption.
Unearthing Plants or Buried Objects, for conveyors which (1) are used to dig, convey,
and separate from the earth desired objects; or (2) are combined
with digging or excavating means and function to separate from the
soil flowing from the digging or excavating means the desired plant
or buried object; or (3) are combined with an unearthing device
and function merely to feed material to or from such device.
Classifying, Separating, and Assorting Solids, for a conveying system for separating conveyed articles
employing means to sense variations in size or other physical characteristics
of the article.
Liquid Purification or Separation,
subclasses 400+ , for belt-type filters and subclasses 523+, for
gravitational separators having a mechanical mover constituent.
Advancing Material of Indeterminate Length, provides the search for methods of and apparatus
for feeding material without utilizing the leading or trailing ends
thereof to effect movement of the material.
Metallurgical Apparatus, for apparatus for treating solid metal. Cooling
beds in which a bar of metal is conveyed while cooling are classified
in Class 198, even though the bar may be rotated while being conveyed
to keep it straight.
Sheet Feeding or Delivering, appropriate subclasses, for a machine having one or more
of the following functions: A. Separating a sheet from a stack of
such sheets and conveying the separated sheet, usually to a station
whereat an operation (e.g., printing, cutting, etc.) is to be performed,
B. Conveying a sheet, usually from a station whereat an operation
has been performed, to a receiver whereat the sheet is stacked together
with other such sheets, C. Conveying a sheet (e.g., from a stack
to an operation), and concurrently performing an operation-related
function (e.g., aligning the conveyed sheet relative to the operation
station, interrupting the feed in response to absence or excess
of sheets, intermittently moving a sheet relative to an operation
station, etc.). Also see
subclass 213 , (1) Note for a particular combination of conveyor
on which a plurality of sheets is stacked and subsequently moved
as a stack, and for a line note distinguishing structure proper
for Class 271 and this class (198).
Material or Article Handling, for instruments and mechanical methods for placing
or displacing particular articles in a particular manner or with
reference to a particular support, for loading or unloading vehicles
with materials or objects in general, charging or discharging furnaces,
ovens, bins or other containers, stacking or piling articles or
materials, also combination of general types of carriers or forwarding mechanisms,
which types, per se, are separately classified elsewhere, and general
types of elevators, cranes or hoists when associated with special
means for handling the load to place it on the carrier or remove
it therefrom.
Supports: Cabinet Structure, for endless conveyors used in dispensing environments;
see
subclass 97 , if the conveyor moves the load to a door for manual
removal from within a cabinet.
Supports: Racks, for endless conveyors used in dispensing environments;
subclasses 121+ for an endless support rack not claiming cabinet structure
or dispensing (e.g., endless filing system, etc.).
SECTION V - GLOSSARY
The following explanations represent an attempt
to clarify and limit the concepts of certain conveyor art terms, the
first two applying to the manner in which they are encountered in
Class 193, Conveyors, Chutes, Skids, Guides, and Ways, subclasses
44+.
CHUTE
A structure capable of guiding a gravity induced flow
of material therethrough or thereon. While a chute is more often
than not an inclined passageway in the form of a trough, it occasionally
takes the form of a conduit. Inasmuch as a chute with a gate, especially
a chute in the form of a conduit, presents structure closely related
to that of a hopper, such structures are distinguished on the basis
of whether a storage concept exists (hopper) or does not exist (chute).
A receptacle positioned in such manner as to impart the property
of gravity induced flow to material contained therein, and, therefore,
to be a source of supply to components "downstream" thereof.
While it is not essential that the contained material be "stored" for
a finite period of time, there should be a concept of supporting
it for an interval longer than that required for mere passage therethrough. A
hopper has an inlet and an outlet, although the inlet may be merely
an open side (of the receptacle). The outlet, however, will have
a provision whereby passage of the contents can be controlled (e.g.,
possibly a conveyor). The provision of chutelike structure integral with
the hopper, whereby material is guided into the inlet or out of
the outlet, should not be considered as constituting a separate
element. (This is in line with what appears to be a basic difference
between chutes and hoppers; namely, a chute guides whereas
a hopper stores and may
guide). "Gravity-induced" is not intended
to be construed to exclude those nondriven conveyors which utilize
mechanical means (e.g., a vibrator) to start to maintain flow (i.e.,
bridge breaking).
CONDITION RESPONSIVE
Apparatus having (1) means to sense a condition of the environment
surrounding the conveyor and means responsive to said sensing means
to cause a change in the operating condition of the conveyor, or
(2) means to sense a particular condition which may or may not exist
relative to the conveyor itself, such as speed, overload, motor
temperature, etc., and means responsive to said sensing means to
act to change the operating condition of the conveyor.
CONVEYING APPARATUS ENTIRELY SUPPORTED BY MOBILE GROUND ENGAGING
MEANS:
This subclass is indented under the class definition. Apparatus wherein the load conveyor or conveyor system is
wholly supported upon a carrier having wheels, treads, skids, or
other means permitting its free movement on the ground or a floor.
(1)
Note. The words "wholly supported upon a carrier
having wheels, skids, . . ." in the definition of this
subclass excludes a conveyor or conveying system partially sustained
by such a carrier or a plurality of such carriers and partially sustained
by any other support except the ground or a floor. Thus the subclass includes
a conveyor support frame mounted on a carrier of the type described
so that one end of said frame can slide on the ground, but the subclass does
not include a conveyor partially supported on such a carrier and
partially supported by (1) fixed ground supports such as stanchions
or (2) a mobile carrier of a different type, such as a track traversing
vehicle.
(2)
Note. Assignment of a patent in this subclass or its indents
does not require a claim that a conveyor is mounted on specific
ground vehicle type supports such as wheels, skids, or caterpillar
tracks, but may be based on any claim language indicating that a
conveyor is freely movable on the ground, e.g., by claim limitations
stating that a conveyor is mounted on a "carriage," "truck," "slidable
support" or "movable support means," where
such terms are clearly supported by the disclosure of a ground vehicle type
support for a conveyor. However, a conveyor defined only as being "portable" has
not been included here.
This subclass is indented under subclass 300. Apparatus having separate means which senses the occurrence
of a condition or a change in condition and in response thereto
acts to start, stop, or change the manner of operation of either
the load conveyor or its carrier.
This subclass is indented under subclass 300. Apparatus including means for lifting a wheel of the carrier
from its supporting surface, e.g., to transfer the weight of the
apparatus to a fixed support leg while the conveyor is operated
at a selected site.
This subclass is indented under subclass 300. Apparatus wherein at least three separate carriages having
wheels or tracks are joined together to support the conveyor assembly
and are independently movable relative to each other.
This subclass is indented under subclass 304. Apparatus including flexible means connected to a reel mounted
on the carrier, the free end of said flexible means being anchored
at a selected point and the reel then rotated to thereby pull the
carrier toward said point.
This subclass is indented under subclass 300. Apparatus including at least one carrier support wheel securable
in two ground engaging positions disposed 90o a part relative to
the carrier frame, thus permitting selective travel of the carrier
in either one of two perpendicular directions merely by shifting
the position of said wheel.
(1)
Note. This subclass does not include a conveyor supported
on a vehicle equipped with a caster wheel that is not lockable in
two positions spaced 90° apart.
Fluid Sprinkling, Spraying, and Diffusing,
subclass 742 , for sprinkling apparatus carried on a train of
vehicles with adjustable wheels permitting travel of the train in
the direction of its length or in the direction normal to its length.
This subclass is indented under subclass 300. Apparatus wherein the conveyor includes at least one holder
having a pocket formed thereon for retaining a load.
This subclass is indented under subclass 300. Apparatus including lifting means, such as a scoop or a
row of closely spaced teeth, movable under a load by translation
of the carrier or by movement of said means itself, usually for the
purpose of transferring the load to another section of the conveyor
assembly.
(1)
Note. Included here is a vehicle equipped with a ground-engaging
ramp having mounted thereon a rotatable arm which gathers ore or
other loose material and moves it up said ramp.
This subclass is indented under subclass 300. Apparatus including conveyor drive means operated by motion
of a wheel or other support element of the carrier.
Card, Picture, or Sign Exhibiting,
subclass 43 , for an endless belt used as a display device and
actuated from the revolving axle or wheel of a vehicle, and subclass
48, for an endless belt of the same type that is actuated by mechanism
which contacts an obstacle located along the track of a vehicle
carrying the device.
This subclass is indented under subclass 300. Apparatus wherein the load is moved along at least a portion
of the conveyor by the force of gravity alone, or including a bin
from which material is removed by a conveyor.
This subclass is indented under subclass 300. Apparatus including means permitting movement of a conveyor
to different working positions or orientations relative to the carrier
on which it is mounted.
(1)
Note. Included here is a conveyor vertically adjustable relative
to ground engaging supports of the carrier vehicle.
This subclass is indented under subclass 312. Apparatus wherein a conveyor can be telescoped or swung
to a more compact configuration that it has when operating, e.g.,
to facilitate transporting the conveyors along a road.
This subclass is indented under subclass 312. Apparatus including separate conveyors mounted on a single
carrier so that they successively convey a load.
This subclass is indented under subclass 315. Apparatus wherein the conveyor moving means includes a cylinder
and piston mechanism operated by fluid pressure.
(1)
Note. Included here is a ram operated by fluid pressure derived
from any means, including a manually worked pump.
This subclass is indented under subclass 312. Apparatus including a conveyor rotatable to extend in different
directions circumferentially of the carrier.
This subclass is indented under subclass 312. Apparatus including a conveyor inclinable at different angles
relative to the ground.
(1)
Note. Not included here as vertically swingable is a conveyor
support frame that pivots about the axle of a two-wheeled vehicle
in the same way that the drawbar and bed of a two-wheeled trailer pivot
about the trailer axle. The support frame of the conveyor must
be vertically swingable relative to a supporting frame of the vehicle.
This subclass is indented under subclass 318. Apparatus having means for retaining a support platform
for a conveyor drive motor in the same position as the conveyor
swings to different inclinations.
This subclass is indented under subclass 318. Apparatus including flexible means connected to a support
frame for the conveyor and to a reel mounted on the carrier, whereby
rotation of said reel changes the inclination of said conveyor.
CONVEYOR OR ACCESSORY THEREFOR SPECIALIZED TO CONVEY PEOPLE:
This subclass is indented under the class definition. Devices wherein a conveying section is provided with structure
which particularizes the section to move people from one location
to another. Further included herein are the subcombinations peculiar
to such sections, e.g., handrails, guards, etc.
(1)
Note. Examples of structure particularizing a section for
conveying people are moving steps, conveyors having handrails, conveyors
having serrated foot engaging surfaces and entrance or exit comb
plates, passenger operated drive control means, etc.
Railways,
subclass 25 , for endless railways or moving sidewalks combined
with an endless railway. Some of the features indicative of an
endless railway are cabs or other passenger enclosures, releasable
drivers for the cars, seats, etc.
This subclass is indented under subclass 321. Device wherein the section is provided with means to regulate
the operation of the section, which means effects such regulation
in response to an operating instruction which is either originated
by a condition sensing means or is introduced into the system by
the operator.
(1)
Note. Examples of structure to be found herein include passenger
controlled conveyors, jam prevention safety circuits, section speed
controllers, etc.
for means to drive, start or stop a conveying section,
especially subclass 856, for controls responsive to abnormal operating
conditions of a conveying section.
This subclass is indented under subclass 322. Device wherein a means to sense the operation of the section
is provided which originates an operation command to vary the speed
of or to stop the section if some condition is sensed which is dangerous
or potentially dangerous to either the conveying mechanism or to
the passengers moved by the mechanism.
This subclass is indented under subclass 321. Device wherein the section is provided with means located
at a terminal end of the section to aid in the movement of passengers
onto or off of the section.
This subclass is indented under subclass 324. Device wherein the means to facilitate entry or exit, includes
a platform formed with a plurality of elements which interleaf with
grooves formed on the conveying surface to effect or to aid movement
of passengers to or from the section.
This subclass is indented under subclass 321. Device wherein the section includes a continuous train of
moving tread members which are either attached one to the other
so as to form a closed loop or are mounted to an interminable belt-like
member and which form a moving flight of stairs as they are moved
along an inclined surface.
This subclass is indented under subclass 326. Device wherein the endless member includes a plurality of
pivotally connected tread and riser members which alternate one
with the other and wherein the moving flight of stairs is formed
by flexing the endless member to displace the risers to a vertical
attitude and the treads to a substantially horizontal attitude.
This subclass is indented under subclass 326. Device wherein the endless member includes a plurality of
articulated steps which are arranged to bend about an axis which
is generally normal to the horizontal.
(1)
Note. Moving stairways having side-by-side ascending and
descending flights formed from the same endless member will be found
herein.
This subclass is indented under subclass 326. Device wherein the section is provided with means which
will take up undesired slack in the endless member or will accommodate
for misalignments which occur when such slack is taken up.
This subclass is indented under subclass 330. Device wherein the system is provided with a moving hand
supporting and guiding structure and means are provided for moving
the steps and the hand support structure in unison.
This subclass is indented under subclass 326. Device wherein the section is provided with two guide rail
means which simultaneously coact with followers carried by each
step to maintain the tread portion of the step in a horizontal attitude
as it moves through that portion of its path which constitutes the
flight of stairs.
This subclass is indented under subclass 326. Device wherein the section includes the specific structural
features of the passenger supporting platforms, i.e., the steps,
carried by the endless member.
This subclass is indented under subclass 321. System wherein the means specialized to handle people includes
a) a conveying means or an accessory therefore which is adapted
to move at different rates at different points along its path of
travel, or b) a system of plural conveying sections which operate
at different speeds and which are arranged such that a passenger may
move from one section to another.
This subclass is indented under subclass 321. Device wherein a structure is provided which has a moving
member adapted to be grasped by the hand of a passenger to steady
the passenger while entering, riding on or exiting from the conveying
section.
This subclass is indented under subclass 335. Device wherein the moving member is a flexible belt and
the structure further includes means to take up slack which may
develop in the belt.
This subclass is indented under subclass 335. Device preventing the entry of a passenger"s hand
into an entrance or exit hole formed in a balustrade for the moving
member.
WITH MEANS TO FACILITATE WORKING, TREATING, OR INSPECTING
CONVEYED LOAD AT A STATION:
This subclass is indented under the class definition. Apparatus including specialized structure, either part of
the conveyor or separate means associated therewith, specifically
provided for the purpose of aiding the working, treating, or inspecting
of the load by separate means at a station situated along the conveying path.
(1)
Note. Included herein is a conveyor having associated therewith
claimed means for working or treating a load, where the combination
of such means and the conveyor is not classifiable elsewhere on
the basis of the working or treating means.
(2)
Note. A nominal recitation that a conveyor operates in a
machine for performing some work operation, that the load passes
through a treating station or that a conveyor is intermittently
driven in a working or treating apparatus does not warrant placement
of a patent here. Such patens should be classified in other subclasses
of this class on the basis of the claimed structure.
(3)
Note. Combinations of a conveyor and a treating tank are
found in the appropriate treating class such as Class 118, 134 or 204.
This subclass is indented under subclass 339.1. Apparatus including indicia or other identification means
associated with the conveyed load, or a signalling device associated
with either the conveyor or separate work means, which provides
an attendant or workman with information regarding operation of
the conveyor or handling of the load.
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