U.S. patent application number 13/863009 was filed with the patent office on 2013-09-05 for powered roller conveyor systems.
This patent application is currently assigned to KPC- Master's Craft International, Inc. The applicant listed for this patent is KPC- MASTER'S CRAFT INTERNATIONAL, INC. Invention is credited to Richard Floyd Anderson.
Application Number | 20130228420 13/863009 |
Document ID | / |
Family ID | 43878449 |
Filed Date | 2013-09-05 |
United States Patent
Application |
20130228420 |
Kind Code |
A1 |
Anderson; Richard Floyd |
September 5, 2013 |
POWERED ROLLER CONVEYOR SYSTEMS
Abstract
A power roller conveyor system includes a section having a slide
mechanism that engages a loop that is driven by an external motor.
The loop slides along a surface of the slide mechanism. The slide
mechanism maintains the loop in frictional engagement with surfaces
of rollers of the conveyor, whereby the rollers are directly driven
by the loop. A wheel may bridge a directly driven roller and
another roller that is not driven. The other roller and driven
roller bridged by the wheel may be separated by an intermediate
roller. The section may be a straight section, a 90 degree curved
section, or a 180 degree curved section.
Inventors: |
Anderson; Richard Floyd;
(Massillon, OH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KPC- MASTER'S CRAFT INTERNATIONAL, INC |
Massillon |
OH |
US |
|
|
Assignee: |
KPC- Master's Craft International,
Inc
Massillon
OH
|
Family ID: |
43878449 |
Appl. No.: |
13/863009 |
Filed: |
April 15, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12872126 |
Aug 31, 2010 |
8418839 |
|
|
13863009 |
|
|
|
|
61238671 |
Aug 31, 2009 |
|
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|
Current U.S.
Class: |
198/790 |
Current CPC
Class: |
B65G 13/071 20130101;
B65G 13/07 20130101; B65G 13/08 20130101 |
Class at
Publication: |
198/790 |
International
Class: |
B65G 13/07 20060101
B65G013/07 |
Claims
1. A section of a power roller conveyor, comprising: (a) a
plurality of rollers; (b) an endless loop driven either directly or
indirectly by a motor and traveling along the section and in
engagement with at least a subset of the plurality of rollers; and
(c) a slide mechanism defining a groove within which the endless
loop slides while traveling in engagement with the subset of
rollers.
2. The section of a power roller conveyor according to claim 1,
wherein the groove is defined in the top surface of the slide
mechanism.
3. The section of a power roller conveyor according to claim 1,
wherein the loop is maintained in frictional engagement with
surfaces of the rollers of the subset, whereby the rollers are
directly driven by the loop.
4. The section of a power roller conveyor according to claim 1,
wherein a low coefficient of friction exists between the surface of
the slide mechanism against which the loop slides and the loop.
5. The section of a power roller conveyor according to claim 1,
wherein each of the subset of rollers includes a sleeve extending
over the surface thereof adjacent an end thereof, the sleeve
engaging the loop for traction and driving of the roller.
6. The section of a power roller conveyor according to claim 5,
wherein a high coefficient of friction exists between the surface
of the loop and the sleeve of the roller.
7. The section of a power roller conveyor according to claim 1,
wherein the slide mechanism includes a material that is self
lubricating, whereby frictional stress exerted on the loop by the
slide mechanism is greatly reduced.
8. The section of a power roller conveyor according to claim 1,
wherein the slide mechanism comprises a curved slide mechanism that
generally tracks a curve in a side rail of the section of the
powered conveyor system.
9. The section of a power roller conveyor according to claim 1,
wherein the slide mechanism comprises a straight slide mechanism
that generally extends linearly along a length of the section of
the powered conveyor system.
10. The section of a power roller conveyor according to claim 1,
wherein the slide mechanism is made from Ultra High Molecular
Weight Polyethylene ("UHMW-PE").
11. The section of a power roller conveyor according to claim 1,
wherein the loop is composed of polyurethane or related
polymers.
12. The section of a power roller conveyor according to claim 1,
wherein the loop comprises a belt formed from tanned leather.
13. The section of a power roller conveyor according to claim 1,
wherein sides of the slide mechanism that at least partially define
the groove are scalloped, and wherein the subset of rollers extend
within the recessed areas of the scalloped sides for contacting of
the loop.
14. The section of a power roller conveyor according to claim 1,
wherein the sides of the slide mechanism exhibit a wavy profile,
and wherein the subset of rollers extend within the troughs of the
wavy sides to contact the loop.
15. The section of a power roller conveyor according to claim 1,
wherein the loop includes a flat, smooth surface that is exposed
when traveling in engagement with the subset of rollers, and a
non-exposed curved surface that slides against the slide mechanism
in a conforming fit within the groove.
16. The section of a power roller conveyor according to claim 1,
wherein the section is a straight section.
17. The section of a power roller conveyor according to claim 1,
wherein the section is a 90 degree section.
18. The section of a power roller conveyor according to claim 17,
wherein the slide mechanism is curved.
19. The section of a power roller conveyor according to claim 17,
wherein the slide mechanism is generally linear.
20. The section of a power roller conveyor according to claim 1,
wherein the section is a 180 degree section.
21. The section of a power roller conveyor according to claim 1,
further comprising a wheel arranged to engage a roller of the
subset of rollers driven by the loop and to engage a roller not in
engagement with the loop, whereby the roller not in engagement with
the loop is indirectly driven by the loop.
22. The section of a power roller conveyor according to claim 21,
wherein the roller not in engagement with the loop that is
indirectly driven by the loop is an end roller of the section.
23. The section of a power roller conveyor according to claim 22,
further comprising a second wheel arranged to engage a roller of
the subset of rollers driven by the loop and to engage a second
roller not in engagement with the loop, whereby the second roller
not in engagement with the loop is indirectly driven by the loop,
and wherein the second roller not in engagement with the loop that
is indirectly driven by the loop is another end roller of the
section located at an opposite end of the section to the first said
roller not in engagement with the loop that is indirectly driven by
the loop.
24. The section of a power roller conveyor according to claim 23,
wherein each of the wheels is coated with a silicone material.
25. The section of a power roller conveyor according to claim 22,
wherein an intermediate, concentrated roller extends between the
roller of the subset engaged with the wheel and the end roller
driven by the wheel.
26. The section of a power roller conveyor according to claim 22,
wherein the concentrated roller is approximately half as long as
each of the roller of the subset engaged with the wheel and the end
roller driven by the wheel.
27. The section of a power roller conveyor according to claim 25,
wherein the concentrated roller is mounted to a side rail of the
conveyor and is a member of the subset of rollers arranged in
engagement with and driven by the loop.
28. The section of a power roller conveyor according to claim 27,
wherein the concentrated roller is mounted to a side rail of the
conveyor and is a member of the subset of rollers arranged in
engagement with and driven by the loop.
29. The section of a power roller conveyor according to claim 27,
wherein the concentrated roller is mounted to and supported by an
intermediate support that extends generally longitudinally along
the section approximately half way between the side rails of the
section.
30. A section of a power roller conveyor system as disclosed
herein.
31. A method of making a section of a power roller conveyor system
as disclosed herein.
32. A method of using a section of a power roller conveyor system
as disclosed herein.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application is a U.S. continuation patent
application of, and claims priority under 35 U.S.C. .sctn.120 to,
U.S. nonprovisional patent application Ser. No. 12/872,126, filed
Aug. 31, 2010, which published as U.S. patent application
publication no. US 2011/0089002 A1, which nonprovisional patent
application and any patent application publications thereof are
incorporated by reference herein, and which nonprovisional patent
application is a U.S. nonprovisional patent application of, and
claims priority under 35 U.S.C. .sctn.119(e) to, U.S. provisional
patent application Ser. No. 61/238,671, filed Aug. 31, 2009, which
provisional patent application is hereby incorporated herein by
reference.
COPYRIGHT STATEMENT
[0002] All of the material in this patent document is subject to
copyright protection under the copyright laws of the United States
and other countries. The copyright owner has no objection to the
facsimile reproduction by anyone of the patent document or the
patent disclosure, as it appears in official governmental records
but, otherwise, all other copyright rights whatsoever are
reserved.
BACKGROUND OF THE INVENTION
[0003] The present invention relates to powered roller conveyor
systems and, in particular, straight sections, 90 degree sections,
and 180 degree sections thereof
[0004] A. Powered Roller Conveyor Systems: Straight Sections
[0005] A conventional straight section of a powered roller conveyor
system is shown in FIG. 1 and includes pulleys and a belt. A
partially disassembled conventional straight section of a powered
roller conveyor system is shown in FIG. 2 and is similar in
structure and operation to that shown in FIG. 1. Another partially
disassembled conventional straight section of the powered roller
conveyor system of FIG. 2 is shown in FIG. 3, and a pulley and
associated components of that powered roller conveyor system are
shown in FIG. 4.
[0006] One conventional method of powering a roller is to use an
internal motor. A good example of an internally powered roller is
the motorized roller shown in FIG. 5, which is manufactured by Itoh
Denki of Hanover Township, PA under model number PM486FS. The
internally powered roller shown in FIG. 5 includes two groves, each
one designed to receive a loop of some kind, ranging from a rubber
band to an O-ring, chain, belt, tube, strand, cord or cable
(hereinafter referred to generally as a "loop"). The loop extends
to an adjacent roller for indirectly driving the adjacent roller. A
powered roller conveyor system is shown in FIG. 6, in which rollers
are internally powered and include loops and grooves for driving
other rollers.
[0007] While less expensive than an internally powered roller, the
non-powered rollers are more expensive than regular rollers due to
the groves and the loops, which creates the need for a lot of parts
and creates subsequent maintenance issues.
[0008] Another method is to drive one or more of the roller with an
exterior motor. The motor pulls a loop that is engaged with and
directly drives one or more of the rollers, and some of the rollers
are not driven by such loop and, instead, are driven by secondary
loops that extend between such rollers and the directly driven
rollers. For example, an external motor may drive a single roller
via a chain, and additional chains and sprockets may be used for
other rollers to be driven by such single roller. An exemplary
chain-driven powered roller conveyor is shown in FIGS. 7-8. Each
roller includes two sprockets and is connected by respective chains
to adjacent rollers.
[0009] Another way of powering a conveyor includes using an
external motor that rotates a drive shaft that runs the length of
the conveyor. A respective loop extends from the shaft to each
roller, and the loop twists in a figure eight whereby the shaft and
the rollers rotate perpendicular to one another. FIGS. 9-11
illustrate such a powered roller conveyor system.
[0010] Yet another conventional way to drive a powered roller
conveyor is to use a loop that extends under and frictionally
engages the surfaces of the driven rollers. A belt may be used that
is flat or may include a "V" or "U" cross-sectional profile. An
exemplary powered roller conveyor that utilizes a loop in the form
of a wide and flat belt to frictionally engage and drive rollers is
shown in FIGS. 12-14.
[0011] B. Powered Roller Conveyor Systems: 90 Degree Curved
Sections
[0012] Curved power roller conveyors are more complicated to design
and build, especially with the conventional use of pulleys,
compared to straight section powered roller conveyors.
[0013] A 90 degree curved section of a conventional powered roller
conveyor system is shown partially disassembled in FIG. 15. FIGS.
16-17 also illustrate partially disassembled views of another,
similar 90 degree curved section of a conventional powered roller
conveyor system.
[0014] In use, it is difficult to keep the loop on and tracking
correctly, and the pulley system creates drag which causes the loop
(if extensible) to stretch and eventually fall off.
[0015] Additionally, it will be appreciated that in conventional 90
degree curved sections of powered roller conveyor systems, the last
roller in a curved section is indirectly driven by tying the last
roller with a prior driven roller, again using a loop of some kind.
Normally the rollers that are looped together have a special crimp
into which the loop of material is placed, which enables the loop
to track correctly and stay in place.
[0016] C. Powered Roller Conveyor Systems: 180 Degree Curved
Sections
[0017] A 180 degree curved section of a conventional powered roller
conveyor system is shown partially disassembled in FIG. 18.
[0018] As will be appreciated, the drive mechanisms of these
foregoing conventional ways tend to follow the curve, which is
believed to be a significant contributor to the expense thereof, as
following the curve requires more parts in tracking the curve and
more labor in assembly.
[0019] Various ways exist to power 180 degree and 90 degree curved
sections of powered roller conveyors. One way is to power all of
the pulleys. Another way is to use a tapered roller, which can be
the internal motor type or driven by a loop (e.g., belt, chain,
etc.). This is generally expensive. A third way is to use a series
of drive shafts that are coupled together with "U" joints. Normally
the shaft drives the rollers by the twisted, figure "8" loops.
Curved sections of conventional powered roller conveyor systems
that utilize U joints are represented in FIG. 19.
[0020] Due to space constraints, extra cost or other reasons, it is
often common to directly drive only a subset of the rollers
directly by the power source--rather than directly drive all of the
rollers--in a powered roller conveyor. In such cases, the other
rollers are driven by indirect means.
[0021] Additionally, it will be appreciated that, like in with 90
degree curved sections, in many conventional 180 degree curved
sections of powered roller conveyor systems, the last roller in a
curved section is indirectly driven by tying the last roller with a
prior driven roller using a loop. Normally the rollers that are
looped together have a special crimp into which the loop of
material is placed, which enables the loop to track correctly and
stay in place.
[0022] As will be appreciated by those having ordinary skill in the
art, the straight sections of powered roller conveyors are much
easier to make and use compared to the 90 degree and 180 degree
curved sections of powered roller conveyors. The curved sections
have many additional parts, it is difficult to keep the loop on and
tracking correctly in such conveyors, and the pulley system in the
curved section of such conveyors creates drag which causes the loop
to stretch (if extensible) and fall off.
SUMMARY OF THE INVENTION
[0023] The present invention includes many aspects and features.
Moreover, while many aspects and features relate to, and are
described in, the context of power roller conveyors, the present
invention is not limited to use only in this context, as will
become apparent from the following summaries and detailed
descriptions of aspects, features, and one or more embodiments of
the present invention.
[0024] Accordingly, one aspect of the present invention relates to
a section of a power roller conveyor. The power roller conveyor
includes a plurality of rollers, an endless loop driven either
directly or indirectly by a motor and traveling along the section
and in engagement with at least a subset of the plurality of
rollers, and a slide mechanism defining a groove within which the
endless loop slides while traveling in engagement with the subset
of rollers.
[0025] In a feature of this aspect, the groove is defined in the
top surface of the slide mechanism.
[0026] In a feature of this aspect, the loop is maintained in
frictional engagement with surfaces of the rollers of the subset,
whereby the rollers are directly driven by the loop.
[0027] In a feature of this aspect, a low coefficient of friction
exists between the surface of the slide mechanism against which the
loop slides and the loop.
[0028] In a feature of this aspect, each of the subset of rollers
includes a sleeve extending over the surface thereof adjacent an
end thereof, the sleeve engaging the loop for traction and driving
of the roller.
[0029] In a feature of this aspect, a high coefficient of friction
exists between the surface of the loop and the sleeve of the
roller.
[0030] In a feature of this aspect, the slide mechanism includes a
material that is self lubricating, whereby frictional stress
exerted on the loop by the slide mechanism is greatly reduced.
[0031] In a feature of this aspect, the slide mechanism comprises a
curved slide mechanism that generally tracks a curve in a side rail
of the section of the powered conveyor system.
[0032] In a feature of this aspect, the slide mechanism comprises a
straight slide mechanism that generally extends linearly along a
length of the section of the powered conveyor system.
[0033] In a feature of this aspect, the slide mechanism is made
from Ultra High Molecular Weight Polyethylene ("UHMW-PE").
[0034] In a feature of this aspect, the loop is composed of
polyurethane or related polymers.
[0035] In a feature of this aspect, the loop comprises a belt
formed from tanned leather.
[0036] In a feature of this aspect, sides of the slide mechanism
that at least partially define the groove are scalloped, and
wherein the subset of rollers extend within the recessed areas of
the scalloped sides for contacting of the loop.
[0037] In a feature of this aspect, the sides of the slide
mechanism exhibit a wavy profile, and wherein the subset of rollers
extend within the troughs of the wavy sides to contact the
loop.
[0038] In a feature of this aspect, the loop includes a flat,
smooth surface that is exposed when traveling in engagement with
the subset of rollers, and a non-exposed curved surface that slides
against the slide mechanism in a conforming fit within the
groove.
[0039] In a feature of this aspect, the section is a straight
section.
[0040] In a feature of this aspect, the section is a 90 degree
section.
[0041] In a feature of this aspect, the slide mechanism is
curved.
[0042] In a feature of this aspect, the slide mechanism is
generally linear.
[0043] In a feature of this aspect, the section is a 180 degree
section.
[0044] In a feature of this aspect, the section of a power roller
conveyor further comprises a wheel arranged to engage a roller of
the subset of rollers driven by the loop and to engage a roller not
in engagement with the loop, whereby the roller not in engagement
with the loop is indirectly driven by the loop.
[0045] In a feature of this aspect, the roller not in engagement
with the loop that is indirectly driven by the loop is an end
roller of the section.
[0046] In a feature of this aspect, the section of a power roller
conveyor further comprises a second wheel arranged to engage a
roller of the subset of rollers driven by the loop and to engage a
second roller not in engagement with the loop, whereby the second
roller not in engagement with the loop is indirectly driven by the
loop, and wherein the second roller not in engagement with the loop
that is indirectly driven by the loop is another end roller of the
section located at an opposite end of the section to the first said
roller not in engagement with the loop that is indirectly driven by
the loop.
[0047] In a feature of this aspect, each of the wheels is coated
with a silicone material.
[0048] In a feature of this aspect, an intermediate, concentrated
roller extends between the roller of the subset engaged with the
wheel and the end roller driven by the wheel.
[0049] In a feature of this aspect, the concentrated roller is
approximately half as long as each of the roller of the subset
engaged with the wheel and the end roller driven by the wheel.
[0050] In a feature of this aspect, the concentrated roller is
mounted to a side rail of the conveyor and is a member of the
subset of rollers arranged in engagement with and driven by the
loop.
[0051] In a feature of this aspect, the concentrated roller is
mounted to a side rail of the conveyor and is a member of the
subset of rollers arranged in engagement with and driven by the
loop.
[0052] In a feature of this aspect, the concentrated roller is
mounted to and supported by an intermediate support that extends
generally longitudinally along the section approximately half way
between the side rails of the section.
[0053] Another aspect of the present invention relates to a section
of a power roller conveyor system as disclosed.
[0054] Another aspect of the present invention relates to a method
of making a section of a power roller conveyor system as disclosed
herein.
[0055] Another aspect of the present invention relates to a method
of using a section of a power roller conveyor system as disclosed
herein.
[0056] In addition to the aforementioned aspects and features of
the present invention, it should be noted that the present
invention further encompasses the various possible combinations and
subcombinations of such aspects and features. Thus, for example,
any aspect may be combined with an aforementioned feature in
accordance with the present invention without requiring any other
aspect or feature.
BRIEF DESCRIPTION OF THE DRAWINGS
[0057] One or more preferred embodiments of the present invention
now will be described in detail with reference to the accompanying
drawings, wherein the same elements are referred to with the same
reference numerals, and wherein,
[0058] FIG. 1 shows a conventional straight section of a powered
roller conveyor system;
[0059] FIG. 2 shows a partially disassembled conventional straight
section of a powered roller conveyor system;
[0060] FIG. 3 shows another partially disassembled conventional
straight section of the powered roller conveyor system of FIG.
2;
[0061] FIG. 4 shows a pulley and associated components of the
powered roller conveyor system of FIG. 2;
[0062] FIG. 5 shows an example of an internally powered roller;
[0063] FIG. 6 shows a powered roller conveyor system in which
rollers are internally powered and include loops and grooves for
driving other rollers;
[0064] FIGS. 7-8 show An exemplary chain-driven powered roller
conveyor;
[0065] FIGS. 9-11 illustrate a powered roller conveyor system that
uses an external motor that rotates a drive shaft that runs the
length of the conveyor;
[0066] FIGS. 12-14 illustrate an exemplary powered roller conveyor
that utilizes a loop in the form of a wide and flat belt to
frictionally engage and drive rollers;
[0067] FIG. 15 shows a 90 degree curved section of a conventional
powered roller conveyor system that is partially disassembled;
[0068] FIGS. 16-17 illustrate partially disassembled views of a 90
degree curved section of a conventional powered roller conveyor
system;
[0069] FIG. 18 shows a 180 degree curved section of a conventional
powered roller conveyor system that is partially disassembled;
[0070] FIG. 19 shows curved sections of conventional powered roller
conveyor systems that utilize U
[0071] Joints;
[0072] FIGS. 20a-20b show a preferred powered roller conveyor
system including a straight slide mechanism in accordance with one
or more aspects that is partially disassembled;
[0073] FIGS. 21a-21g show a preferred powered roller conveyor
system including a straight slide mechanism in accordance with one
or more aspects that is partially disassembled;
[0074] FIGS. 22-29 show a partially disassembled powered roller
conveyor system in accordance with a preferred embodiment including
a straight slide mechanism;
[0075] FIGS. 30-31 show a partially disassembled preferred powered
roller conveyor system including a straight slide mechanism in
accordance with one or more aspects;
[0076] FIGS. 32a-33j show powered roller conveyor systems in
accordance with preferred embodiments that include curved slide
mechanisms;
[0077] FIGS. 34a-34c demonstrate the ease of removal of rollers
from the side rails of a conveyor;
[0078] FIGS. 35a-35c show a partially disassembled preferred 180
degree curved section of a powered roller conveyor system including
a curved slide mechanism in accordance with one or more aspects of
the invention; and
[0079] FIGS. 36a-37b show a commercial, powered conveyor apparatus
incorporating aspects and features of the present invention.
DETAILED DESCRIPTION
[0080] As a preliminary matter, it will readily be understood by
one having ordinary skill in the relevant art ("Ordinary Artisan")
that the present invention has broad utility and application.
Furthermore, any embodiment discussed and identified as being
"preferred" is considered to be part of a best mode contemplated
for carrying out the present invention. Other embodiments also may
be discussed for additional illustrative purposes in providing a
full and enabling disclosure of the present invention. As should be
understood, any embodiment may incorporate only one or a plurality
of the above-disclosed aspects of the invention and may further
incorporate only one or a plurality of the above-disclosed
features. Moreover, many embodiments, such as adaptations,
variations, modifications, and equivalent arrangements, will be
implicitly disclosed by the embodiments described herein and fall
within the scope of the present invention.
[0081] Accordingly, while the present invention is described herein
in detail in relation to one or more embodiments, it is to be
understood that this disclosure is illustrative and exemplary of
the present invention, and is made merely for the purposes of
providing a full and enabling disclosure of the present invention.
The detailed disclosure herein of one or more embodiments is not
intended, nor is to be construed, to limit the scope of patent
protection afforded the present invention, which scope is to be
defined by the claims and the equivalents thereof. It is not
intended that the scope of patent protection afforded the present
invention be defined by reading into any claim a limitation found
herein that does not explicitly appear in the claim itself.
[0082] Thus, for example, any sequence(s) and/or temporal order of
steps of various processes or methods that are described herein are
illustrative and not restrictive. Accordingly, it should be
understood that, although steps of various processes or methods may
be shown and described as being in a sequence or temporal order,
the steps of any such processes or methods are not limited to being
carried out in any particular sequence or order, absent an
indication otherwise. Indeed, the steps in such processes or
methods generally may be carried out in various different sequences
and orders while still falling within the scope of the present
invention. Accordingly, it is intended that the scope of patent
protection afforded the present invention is to be defined by the
appended claims rather than the description set forth herein.
[0083] Additionally, it is important to note that each term used
herein refers to that which the Ordinary Artisan would understand
such term to mean based on the contextual use of such term herein.
To the extent that the meaning of a term used herein--as understood
by the Ordinary Artisan based on the contextual use of such
term--differs in any way from any particular dictionary definition
of such term, it is intended that the meaning of the term as
understood by the Ordinary Artisan should prevail.
[0084] Regarding applicability of 35 U.S.C. .sctn.112, 6, no claim
element is intended to be read in accordance with this statutory
provision unless the explicit phrase "means for" or "step for" is
actually used in such claim element, whereupon this statutory
provision is intended to apply in the interpretation of such claim
element.
[0085] Furthermore, it is important to note that, as used herein,
"a" and "an" each generally denotes "at least one," but does not
exclude a plurality unless the contextual use dictates otherwise.
Thus, reference to "a picnic basket having an apple" describes "a
picnic basket having at least one apple" as well as "a picnic
basket having apples." In contrast, reference to "a picnic basket
having a single apple" describes "a picnic basket having only one
apple."
[0086] When used herein to join a list of items, "or" denotes "at
least one of the items," but does not exclude a plurality of items
of the list. Thus, reference to "a picnic basket having cheese or
crackers" describes "a picnic basket having cheese without
crackers", "a picnic basket having crackers without cheese", and "a
picnic basket having both cheese and crackers." Finally, when used
herein to join a list of items, "and" denotes "all of the items of
the list." Thus, reference to "a picnic basket having cheese and
crackers" describes "a picnic basket having cheese, wherein the
picnic basket further has crackers," as well as describes "a picnic
basket having crackers, wherein the picnic basket further has
cheese."
[0087] Referring now to the drawings, one or more preferred
embodiments of the present invention are next described. The
following description of one or more preferred embodiments is
merely exemplary in nature and is in no way intended to limit the
invention, its implementations, or uses.
[0088] Aspects of the invention include straight sections of
powered roller conveyors, 90 degree sections of powered roller
conveyors, and 180 degree sections of powered roller conveyors, as
well as powered roller conveyor systems including any such
sections, methods of using such powered roller sections and
conveyors, and methods of making such powered roller sections and
conveyors.
[0089] A. Powered Roller Conveyor Systems: Straight Sections
[0090] In accordance with an aspect of the invention, a straight
section of a powered roller conveyor uses a straight slide
mechanism in conjunction with an endless loop to enable powering of
the rollers. In particular, the loop is driven by an external
motor, and the loop slides along a surface of the slide mechanism.
The slide mechanism maintains the loop in frictional engagement
with surfaces of rollers of the conveyor, whereby the rollers are
directly driven by the loop. The loop that is used preferably is
flexible and includes an outermost exterior surface that is smooth,
and there preferably exists a low coefficient of friction between
the surface of the slide mechanism (against which the loop moves)
and the loop.
[0091] In a feature of this aspect of the invention, the straight
slide mechanism includes a material that is self lubricating,
whereby frictional stress exerted on the loop by the slide
mechanism is greatly reduced. The slide preferably is made from
"UHMW-PE" or Ultra High Molecular Weight Polyethylene. The loop is
composed of polyurethane or related polymers; however, in certain
preferred embodiments the loop comprises a belt formed from tanned
leather (indeed, the leather has been found to have a good
coefficient of friction and does not stretch as much as
polyurethane or related polymers). It furthermore it contemplated
that the loop may be composed or formed from rope, rubber and other
assorted materials.
[0092] In a preferred embodiment, the slide mechanism comprises a
block of material having a groove on the upper surface thereof
within which the loop moves when engaged by the slide material and
pressed into engagement with rollers. A preferred powered roller
conveyor system including such a straight slide mechanism in
accordance with this aspect is shown partially disassembled in
FIGS. 20a-20b. Another preferred powered roller conveyor system
including such a straight slide mechanism in accordance with this
aspect is shown partially disassembled in FIGS. 21a-21g.
[0093] In a feature of these preferred embodiments, sides of the
slide mechanism that define the groove may be scalloped and include
a wavy profile in order to further insure that the loop is kept
within the groove during operation and does not jump out of the
track. While not shown in FIGS. 20a-21g, such feature is shown
below in connection with 90 degree curved sections of certain
preferred embodiments of the invention.
[0094] As will be appreciated, the slide mechanism of a powered
roller conveyor in accordance with this aspect of the invention
includes fewer parts and has the advantage of simplicity and
reduced cost over powered roller conveyors having the foregoing
conventional straight sections.
[0095] B. Powered Roller Conveyor Systems: 90 Degree Curved
Sections
[0096] In accordance with an aspect of the invention, a 90 degree
curved section of a powered roller conveyor uses a straight slide
mechanism to enable powering of the rollers. Furthermore, the
rollers include regular (long) rollers that extend between the side
rails of the conveyor, as well as "concentrated" rollers, each of
which is disposed to these regular rollers and extends between the
outer rail of the conveyor and an intermediate support, which
extends the length of the conveyor section. The concentrated
rollers help bridge the spacing between the regular rollers in the
turns of the conveyor system.
[0097] As before, the loop powering the rollers slides along a
surface of the slide mechanism. The slide mechanism maintains the
loop in frictional engagement with surfaces of rollers of the
conveyor, whereby the rollers are directly driven by the loop. The
loop that is used preferably is flexible and includes an outermost
exterior surface that is smooth, and there preferably exists a low
coefficient of friction between the surface of the slide mechanism
(against which the loop moves) and the loop.
[0098] In a feature of this aspect of the invention, the straight
slide mechanism includes a material that is self lubricating,
whereby frictional stress exerted on the loop by the slide
mechanism is greatly reduced. The slide preferably is made from
"UHMW-PE" or Ultra High Molecular Weight Polyethylene. The loop is
composed of polyurethane or related polymers; however, in certain
preferred embodiments the loop comprises a belt formed from tanned
leather (indeed, the leather has been found to have a good
coefficient of friction and does not stretch as much as
polyurethane or related polymers). It furthermore is contemplated
that the loop may be composed or formed from rope, rubber and other
assorted materials.
[0099] In a preferred embodiment, the slide mechanism comprises a
block of material having a groove on the upper surface thereof
within which the loop moves when engaged by the slide material and
pressed into engagement with rollers. In a feature thereof, sides
defining the groove are scalloped and include a wavy profile in
order to further insure that the loop is kept within the groove
during operation.
[0100] A powered roller conveyor system in accordance with a
preferred embodiment including such a straight slide mechanism is
shown partially disassembled in FIGS. 22-29, and another preferred
powered roller conveyor system including such a straight slide
mechanism in accordance with this aspect also is shown partially
disassembled in FIGS. 30-31. Generally, the preferred powered
roller conveyor system of FIGS. 30-31 differs from that of FIGS.
22-29 only in the location of the straight slide mechanism, which
has been moved away from the short conveyor rail to the middle of
the conveyor in FIGS. 30-31. It further is contemplated that the
straight slide mechanism could be moved to adjacent the longer
(outer) conveyor rail opposite the short (inner) conveyor rail.
[0101] Additionally, in accordance with another aspect of the
invention, a standalone wheel indirectly drives rollers in the
curved section of the 90 degree powered roller conveyor system. In
this respect, the rollers that are touched by the motor driven loop
are directly driven, whereas the last roller is indirectly driven
by means of the wheel, which bridges the last roller with a
directly driven roller.
[0102] In a feature of this aspect, only a single roller is
directly driven, and all of the remaining rollers are indirectly
driven by such bridging wheels. Each bridging wheel preferably is
coated in silicone for traction with the bridged rollers. In
another feature of this aspect, only a single roller is indirectly
driven by a bridging wheel, and all other rollers are directly
driven. In still yet another feature, a first plurality of rollers
are directly driven, and a second plurality of rollers are
indirectly driven by bridging wheels. In this respect, each
bridging wheel may connect rollers that are separated by a single
roller; however, it is also contemplated within the scope of the
invention that a wheel may engage and drive an immediately adjacent
roller if not directly driven.
[0103] Accordingly, in this aspect of the invention, use of the
wheel enables, inter alia, both the ability to drive the last
roller without a loop of material and without the directly driven
roller and the last roller including the crimp for accommodating
the loop. As such, the rollers of the same length are capable of
being interchanged and are not configured to be location specific
within the conveyor section.
[0104] The wheel is included in the powered roller conveyor system
of FIGS. 22-29 and, in particular, can be seen in FIGS. 26-29.
[0105] In alternative embodiments of powered roller conveyor
systems that include 90 degree curved sections, the straight slide
mechanism preferably is replaced with a curved slide mechanism. In
this respect, the curved slide mechanism is generally the same as
the straight slide mechanism but, instead of being straight,
includes a curve that generally matches a curve of the 90 degree
curved section. The curved slide mechanism includes a curve that
generally matches either the curve of the inner side wall of the 90
degree curved section or the outer side wall of the 90 degree
curved section. Like the straight slide mechanism, the straight
slide mechanism includes a material that is self lubricating,
whereby frictional stress exerted on the loop by the slide
mechanism is greatly reduced.
[0106] Additional powered roller conveyor systems in accordance
with preferred embodiments of the invention that include curved
slide mechanisms are shown in FIGS. 32a-32d and FIGS. 33a-33j. The
curved slide mechanism in each is located adjacent the longer
(outer) conveyor rail. This curved slide mechanism additionally
includes the scalloped sides defining the groove within which the
loop is received and travels. Furthermore, the loop in the
embodiment of FIGS. 32a-32d is comprised of polyurethane. In
contrast, the loop in the embodiment of FIGS. 33a-33j comprises a
leather belt. The leather belt preferably includes a flat, smooth
exposed surface for contacting each sleeve of the roller, and a
curved non-exposed surface that conforms to the shape of the
groove.
[0107] In any of these embodiments, the slide mechanism maintains
the loop in frictional engagement with an underside surface of the
rollers, whereby the rollers are driven by the loop. The loop
material and roller surfaces further include nonslip
characteristics such that undue slipping does not occur between the
loop and driven rollers when the loop is driven by the motor.
Moreover, the rollers in the embodiment of FIGS. 33a-33j include
rubber end sleeves that slip over the ends of the rollers and are
arranged to engage the loop in frictional contact therewith. These
sleeves are used to adjust the desired slip and/or grip with the
loop for driving the rollers. Sleeves having different coefficients
of friction with the loop may be selected and used from time to
time to accomplish such adjustment. This is particularly
advantageous when articles to be moved at different times along the
conveyor have substantially different weights. Further in this
respect, each roller is capable of being quickly removed from the
conveyor for changing of the sleeve. The ease of removal of each
roller from the side rails of the conveyor is demonstrated in FIGS.
34a-34c.
[0108] As in the embodiment of FIGS. 22-29, the embodiments of
FIGS. 32a-32d and 33a-33j include use of the bridging wheels for
indirectly driving end rollers, as shown for example in FIG. 32a
and FIG. 33e.
[0109] C. Powered Roller Conveyor Systems: 180 Degree Curved
Sections
[0110] In another aspect of the invention, a powered roller
conveyor system includes a 180 degree curved section having a
curved slide mechanism used to power the rollers in the 180 degree
curved section. As before, the loop slides within a groove or track
defined in the top surface of the slide mechanism. The slide
mechanism maintains the loop in frictional engagement with surfaces
of rollers of the conveyor, whereby the rollers are directly driven
by the loop. The loop that is used preferably is flexible and
includes an outermost exterior surface that is smooth, and there
preferably exists a low coefficient of friction between the surface
of the slide mechanism (against which the loop moves) and the
loop.
[0111] In a feature of this aspect of the invention, the curved
slide mechanism includes a material that is self lubricating,
whereby frictional stress exerted on the loop by the curved slide
mechanism is greatly reduced. The slide preferably is made from
"UHMW-PE" or Ultra High Molecular Weight Polyethylene. The loop is
composed of polyurethane or related polymers; however, in certain
preferred embodiments the loop comprises a belt formed from tanned
leather (indeed, the leather has been found to have a good
coefficient of friction and does not stretch as much as
polyurethane or related polymers). It furthermore is contemplated
that the loop may be composed or formed from rope, rubber and other
assorted materials.
[0112] In a preferred embodiment, the slide mechanism comprises a
block of material having a groove on the upper surface thereof
within which the loop moves when engaged by the slide material and
pressed into engagement with rollers. In a feature thereof, sides
defining the groove are scalloped and include a wavy profile in
order to further insure that the loop is kept within the groove
during operation.
[0113] In accordance with an aspect of the invention, a standalone
wheel (sometimes referred to herein as a bridging wheel) indirectly
drives rollers in the curved section of the 180 degree powered
roller conveyor system. In this respect, the rollers that are
touched by the motor driven loop are directly driven, whereas the
last roller is indirectly driven by means of the wheel, which
bridges the last roller with a directly driven roller.
[0114] In a feature of this aspect, only a single roller is
directly driven, and all of the remaining rollers are indirectly
driven by such bridging wheels. In another feature of this aspect,
only a single roller is indirectly driven by a bridging wheel, and
all other rollers are directly driven. In still yet another
feature, a first plurality of rollers are directly driven, and a
second plurality of rollers are indirectly driven by bridging
wheels. In this respect, each bridging wheel may connect rollers
that are separated by a single roller; however, it is also
contemplated within the scope of the invention that a wheel may
engage and drive an immediately adjacent roller if not directly
driven
[0115] A preferred 180 degree curved section of a powered roller
conveyor system including such a curved slide mechanism in
accordance with this aspect of the invention is shown partially
disassembled in FIGS. 35a-35c. While this embodiment is shown as a
single frame that curves 180 degrees, in alternative embodiments,
two 90 degree curved sections may be joined end-to-end to form a
180 degree curved section of a powered roller conveyor system.
[0116] A first commercial powered conveyor apparatus incorporating
aspects and features of the present invention is shown in FIGS.
36a-36g, as well as in FIGS. 37a-37b, which represent close-up
views of FIG. 36a that better illustrate the bridging wheels of the
commercial powered conveyor apparatus. This particular powered
conveyor apparatus includes an exterior or "outside" integrated
guide rail that is higher than normal. This guide rail extends
above the rollers and keeps packages being conveyed from falling
off the conveyor as they traverse the curve or when the downstream
conveyor gets full and backs everything up onto the 180 powered
conveyor apparatus shown.
[0117] It will be appreciated that, in any of the foregoing power
conveyor systems, individual motors (one mounted to each section)
may respectively power each section or, alternatively, a single
motor may be utilized to power multiple sections jointed
together.
[0118] As will be appreciated, the curved slide mechanism of a
powered roller conveyor in accordance with this aspect of the
invention includes fewer parts and has the advantage of simplicity
and reduced cost over conventional powered roller conveyor systems
having 180 degree curved sections.
[0119] Based on the foregoing description, it will be readily
understood by those persons skilled in the art that the present
invention is susceptible of broad utility and application. Many
embodiments and adaptations of the present invention other than
those specifically described herein, as well as many variations,
modifications, and equivalent arrangements, will be apparent from
or reasonably suggested by the present invention and the foregoing
descriptions thereof, without departing from the substance or scope
of the present invention. Accordingly, while the present invention
has been described herein in detail in relation to one or more
preferred embodiments, it is to be understood that this disclosure
is only illustrative and exemplary of the present invention and is
made merely for the purpose of providing a full and enabling
disclosure of the invention. The foregoing disclosure is not
intended to be construed to limit the present invention or
otherwise exclude any such other embodiments, adaptations,
variations, modifications or equivalent arrangements, the present
invention being limited only by the claims appended hereto and the
equivalents thereof.
* * * * *