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Патент USA US3031825

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May 1, 1962
3,031,816
H. R. MERTENS
STRAP GUIDE
Filed July 26, 1960
2 Sheets-Sheet 1
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United States Patent 0 ice
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Patented May 1, 1362
2
3,031,816
It is another object of the invention to provide camming
STRAP GUIDE
means on the plate against which a pallet contacts and
Howard R. Martens, Worth, lll., assignor to Acme Steel
Company, Chicago, 111., a corporation of Illinois
Filed July 26, 1960, Ser. No. 45,367
13 Claims. (Cl. 53-198)
causes progressive depression of the plate for allowing
the pallet to be conveniently positioned above the plate.
This invention relates to the art of strapping and par
ous conveyor type assembly line operation.
It is another object of the invention to provide a float
ticularly to improved strap guiding means for pallet
strapping.
It is still another object of the invention to provide
such a guide plate which lends itself to use on a continu
ing type spring loading of the guide plate so that it dis—
It is quite common to palletize a load by placing the 10 plays a self-centering feature by distributing its contact
load on a supporting pallet and encircling both the pal
area evenly against the bottom surface of the pallet
let and the load with metal binding straps in order to
platform.
secure the load to the pallet so that the palletized load
A further object of the invention is to provide a strap
can be subsequently handled as a unitized package during
guide plate which is segmented with the segments over
15 lapping each other and movable over each other in a
storage and shipment.
Many times the supporting pallets are provided with
telescoping manner so that the strap guide plate is ad
notches or other type openings at their margins for the
justable in width.
purpose of providing passageways through which the
Still another object is to provide such a strap guide
binding straps can be guided as they are directed be
plate adjustable in width having spring biased means be
20
neath the load while encircling them about the load.
tween the segnents and camming surfaces against which
Because these notches and openings are usually located
a pallet being transported to the strapping station can
in or adjacent to side or end runners of the pallets, they
cam in order to automatically adjust the width of the
do not provide support for the straps between the run
strap guide plate to the width of the space between the
ners so that additional guide means must be positioned
runners of the pallet to insure strap guiding for the full
between the runners for proper guiding of the straps 25 distance between pallet ‘runners.
It is still another object of the invention to provide
One form of strap guide used between the runners
such a spring biased adjustable width strap guide plate
consists of a trough into which the straps are fed, the
wherein the spring bias force provides braking action
trough bridging and guiding each strap from a notch or
to the moving pallet against its runners.
opening on one side of the pallet to an aligned notch or 30
Other objects and advantages of the invention should
between the runners.
opening on the other side of the pallet. The disadvantage
of this trough guide system is that the notches or open
ings of the pallet must be aligned with the trough so that
become apparent by referring to the accompanying draw
ings in which
proper strap guiding can occur.
type strapping line embodying the invention;
FIG. 1 shows a perspective view of a typical conveyor
It is an important object of this invention to provide an 35
FIG. 2 shows a perspective view of a pallet with which
improved guide for location between the runners of a
this invention can be used to advantage;
pallet of a type having strap guiding notches or openings
FIG. 3 shows a longitudinal sectional view of a portion
in the runners or adjacent thereto, which guide does not
of the conveyor shown in FIG. 1 and particularly shows
require critical alignment with the pallet strap guide
a side elevation of the strap guide plate of this invention
notches or openings and still provides proper guiding 40 and its mountings. In this view the strap guide plate is
of the strap between the runners.
shown in its normal position without a pallet in position
It is another object of the invention to provide such a
over it;
guide in the form of a fiat plate which is positioned to
FIG. 4 shows a top plan view of a portion of FIG. 3;
bridge between the runners of a pallet for the full length
FIG. 5 shows a sectional view similar ‘to FiG. 3 except
of the pallet and thereby provide a horizontal guiding sur
that a loaded pallet is also shown positioned on the de
face bridging between all of the strap guide notches or
pressed strap guide plate of this invention; '
openings of the pallet regardless of their spacing from
FIG. 6 shows a modi?ed form of the guide plate of
each other.
'
It is still another important object of the invention to
provide an improved strap guide which has particular
advantage for strapping a pallet of a type having spaced
apart support runners mounted below a load supporting
platform which is provided with one or more open bot‘
tom strap openings extending transversely between the
support runners, the strap guide being used as a tem
porary bottom wall for each of the open bottom strap
openings during feeding of the strap beneath the pallet.
this invention having spring loaded side guides, and
FIG. 7 is a sectional view along the line 7-7 of
line 6.
A pallet 1 of a type which can be strapped advan
tageously by the use of the invention is shown in FIG. 2
and consists of three parallel equally spaced runners 2, 3
55 and 4 connected together by means of a platform con
sisting of parallel spaced boards 5 extending perpendicu
lar to the runners 2, 3 and 4. These boards 5 are nailed
or otherwise suitably fastened to the runners. The spac
It is still another object of the invention to provide a
ing of the parallel boards 5 is deliberately‘ such that the
horizontal guide plate of the type mentioned which is
spaces 6 between them are wider than the width of strap
spring loaded upwardly to normally extend above the 60 used for binding the load to be supported on the pallet
level of the bottom surface of the platform of the pallet
so that straps can be guided through these spaces 6 when
whereby the pallet is used to depress the plate against
the strapping operation is performed. These spaces 6,
spring pressure and thereby insure pressure of the plate
in effect, are strap guide notches or openings above the
against the lower surface of the platform so as to limit
runners 2, 3 and 4 and are open bottom spaces between
65
the strap paths to those in alignment with the strap
the runners.
guide notches or openings.
As shown in FIG. 1, a typical conveyor 7 on which
loads can be palletized conveniently on pallet 1 con
sists of three parallel roller courses 8, 9 and it} on which
means, especially on an inclined conveyor, which auto
matically stops and maintains the pallet and its load in 70 the three runners 2, 3 and 4 of each pallet 1 can be
It is a further object of the invention as a result of the
spring loading of the plate to provide the plate as a brake
strapping position above the plate until forcefully trans
ported o? of the plate to another station.
positioned. For convenience, the conveyor 7 can be
divided into three main portions, a receiving station ‘11, a
3,031,816
3
transverse strapping station 12‘ and a longitudinal strap- '
ping station 13. At the receiving station 111, a pallet l
is provided with a load 14 supported thereon and the load
14 may consist of a single large object or a plurality
4
.
wardly. The cam plate 20 preferably extends slightly
above the board surfaces 5a of these boards 5;
Secured adjacentto the ends of the guide plate 23 are
downwardly extending ?anged tubes 33 and 34 which
objects stacked preferably into a rectangular cubicle
length and width dimensions corresponding to those
telescope around smaller tubes 35 and 36 vwhich are se
cured to the door 37 supporting the conveyor by means
of the supporting‘ pallet 1. The loaded pallet l is then
of screws 33. Within each set of tubes 33, 35 and 34,
36 are helical compression springs 39 and 4%}, respec
transported down the incline of the conveyor 7 to the
tively. The upper ends of both springs 39 and 43 react
transverse strapping station 12 where straps l5 and 16
are encircled around the load 14 with the leading ends 10 against the lower surface of the guide plate 2% while the
lower ends of both of these springs 39 and (it) react
of the straps overlapping the supply ends of the straps
against the ‘?oor 37. These springs urge the guide plate
and interlocking joints formed between the strap ends to
2%? vertically upward. The tube 35 is provided with a
provide closed loops around the load 14. The straps l5
projecting pin 41 which projects into a slot 1422 in the tube
and 16 are preferably fed to the load 14 from guide
tubes 17 and 18 which guide the strap from coils of the 15 33 and the lower end of the slot limits the upward move
ment of the tube 33 by contact with the pin 41. The
strapping material (not shown) positioned adjacent to
tube 36 is provided with a projecting pin 43 which pro
theconveyor 7. The interlocking joint formed between
jects into a slot as in the tube 34- andthe lower end of
the overlapping strap ends is effected by means of a con
the slot limits the upward movement of the tube 34 by
ventional strapping tool 19 suspended in the vicinity of
the transverse strapping station 12 above the load 14. 20 contact with the pin 43. This limitation of the move
ment of both of the tubes 33 and 34' naturally limits the
This strapping tool ‘19 can be a single combination tool
of conventional type which is used to both tension the
strap, form the joint and sever the strap loop from the
upward position of the guide plate 20.
As a pallet 1 with a load 14 thereon cams against the
camming portion 31 of the guide plate 2%) and moves over
supply end of the strap, or else conventional individual
tools can be used for each of these functions. The type 25 the guide plate 24} while depressing it, it ends up in a
position centrally of the guide plate as shown in FIG. 5
of tool used forms no part of the invention and there are
with the guide plate 20 resting upwardly against the
‘many tools known in the art for this purpose.
bottom surfaces 5a of the boards 5 of the pallet l. in
At the transverse strapping station 12 and below the
this position, the plate 20 bridges the open bottom spaces
level of the boards 5 of the pallet l are two strap guide
‘plates 29 which, as hereinafterdescribed, serve as brake 30 6 between the boards 5 and the spaces 6 are then enclosed
guides for the straps l5 and 16 when they are passed
ing means to halt and maintain the palletized load at
7 this strapping station and also act as a glide for the
transverse straps ‘15 and 16 as they are encircled about
therethrough.
It should be noted that the transverse straps 15 and 16,
‘in the situation shown, are encircled only ‘about the load
the palletized load.
After the transverse straps 15 and 16 are encircled 35 14 without securing the pallet 1 to the load 14. This
about the palletized load and properly joined together
does not mean that the transverse straps l5 and 16 can
not be used to secure the pallet to the load 14. Certainly
as encircling loops, the strap load and pallet are pushed
a pallet can be designed whereby the pallet can be se
forward to the longitudinal strapping station 13 where
cured to the load 14 by means of the transverse straps
longitudinal straps 21, 22 and 2,3 are applied around the
load and the pallet in the direction normal to the di 40 15 and 16. A simple way to do this is to place another
layer of boards like 5 above the boards shown in FIG. 2
rection of the transverse straps 15 and ‘16. These straps
in a direction normal to those shown. This new top
21, 22 and 23 are anchored at their leading ends by strap
layer of boards would then be the ones around which the
grippers 24, 25 and 26 which are positioned between the
straps would be applied to secure the pallet to the load 14.
roller courses 8, 9 and 10. Before the palletized load is
It is likely that on some installations the pallets will
presented to the longitudinal strapping station 13, the
vary in width and their runner or leg spacing will not
straps 21, 22 and 23 extend vertically from tubular strap
guides 27, 28 and 23 which guide these straps from supply
necessarily be the same for every pallet. ‘In such a situa
coils (not shown) adjacent to the conveyor 7. As the
tion, it is desirable to design the guide plate and its sup
ports as shown in FIGS. 6 and 7 with adjustable spring
loaded side guides so that complete bridging is provided
palletized load contacts these vertically positioned straps,
and continues to move forward, the straps are bulged 50
into wrapping engagement around three sides of the pal
letized load as shown in FIG. 1. Next, the strap grippers
'24, 25 and 26 are released from the strap ends which
are then brought around into overlapping engagement
between the pallet runners. In FIGS. 6' and 7 a guide
plate 45 similar ":1 function to guide plate 29 is pro
vided. This gut“: plate 45 has provided at its lower
surface two tub: 33 and 34. Each is mounted over tubes
with the portions of the straps leading from the guide 55 35 and 36 in the same manner as those shown in FIGS.
3, 4 and 5. Both are provided with compression springs
tubes 27, 28 and 29. A combination strapping tool 30
39 and 40, slots 42 and 44 and pins 4-1 and 43 for the
is then used to tension the straps, provide interlocking
same identical purposes. The guide plate 45, however, is
joints between the strap ends and thereafter sever the
provided with two side guide plates 46 and 47. The side
then existing strap loops ‘from the supply portions of the
guide plate 46 is secured to two spaced pins 48 each hav
straps. Just as in the case of the strapping tool 19, sepa 60 ing an enlarged head 49 guided in one of two grooves
rate tools can be used to perform separate functions of
50 in the guide plate 45. The lower end of each pin 48
the combination strapping tool 30. When the straps 21,
extends downwardly beneath the level of the side guide
22. and 23 are ?nally tensioned and joined as encircling
plate 46 and contacts the outer end of one of two com
loops about the palletized load, the job is complete and
pression springs 51 which is contained in a U-shaped
‘the result is a unitized load strapped securely to the pal 65 sleeve 52 secured at its inner end to one of the tubes 33
let whereby it is then ready for subsequent handling and
or 34. Ordinarily, the springs 51 urge the pins 48 out
shipment.
wardly where they are stopped by the outer ends of the
As shown in ‘FIGS. 3 and 4, each strap guide plate 20
grooves 50. Upon pressure inwardly against the edge of
is of rectangular shape in plan view'and provided at its 70 the side guide plate 46, the pins as are moved along the
rear end with a downwardly extending cam portion 3i
guides 50 and they compress the springs 51.
and a downwardly extending cam portion 32 at its for
In a similar manner, the side guide plate 47 is provided
ward end. The purpose of these cam portions 31 and 32
with two pins 53 each of which extends through one of
is to provide cam means against which the leading board
two slots 54 in the guide plate 45. The lower end of
5 of the pallet 1 can be used to cam the plate 20 down 75 each of the pins 53 extends downwardly below the level
5,031,816
of the guide plate 45 and reacts against the outer end of
strap guide plate when a pallet is not positioned at the
one of two springs 55 which are housed in U-shaped
sleeves 56 secured at their inner ends to the tubes 33 and
34. The inner ends of the springs 55 react against these
strapping station.
3. The combination in strapping apparatus for strap
tubes 33 and 34 in such a manner as to urge the pins 53
ping a pallet of a type having spaced apart support run
ners below a load supporting platform, comprising, a
outwardly, being limited in their outward movement by
the outer ends of the slots 54 and, thus, limiting the
outward lateral movement of the side guide plate 47.
strapping station, a strap guide plate at said strapping
station, bias means for urging said strap guide plate
upwardly, stop means for ordinarily limiting the height
As a pallet 1 is moved on the conveyor 7 toward the
of the strap guide plate when a pallet is not positioned
guide plate 45 in the direction of the arrow 57 in PEG. 6, 10 at the strapping station to a height higher than the level
the bottom surface of the leading board 5 of the pallet 1
of the bottom surface of the platform of the pallet, a cam
reacts against the leading portion 58 of the guide plate
surface on the end of the strap guide plate against which
45 which portion 58 is bent downwardly to act as a cam
the pallet can be cammed to cause the strap guide plate
ming surface. Similarly, the forward portion 59 of the
to be lowered against the force of said bias means and
guide plate 45 is bent down to provide a camrning surface 15 allow the pallet to be moved into position over the strap
guide plate.
for a pallet moving in a direction opposite to that of the
arrow 57. As the pallet 1 continues in the direction of
4. The combination in strapping apparatus for strap
the arrow 57 it depresses the guide plate 45 and contacts
ping a pallet of a type having spaced apart support run
the margins of the side guide plates 46 and 47 along the
ners below a load supporting platform, comprising, a
inner walls of the runners of the pallet 1. The side guide 20 conveyor, a strapping station on said conveyor, said con
plates 46 and 47 are rounded off at their corners 46a and
veyor being sloped downwardly toward said strapping
47a to provide camming surfaces for the purpose of
station so that a pallet positioned on said conveyor is
properly de?ecting the side guide plates 46 and 47 toward
urged by gravity down the conveyor toward the strap
each other against the pressure of the springs 51 and 55.
ping station, a strap guide plate mounted for vertical
When the pallet 1 is ?nally centrally in place over the 25 movement at said strapping station with its upper surface
guide plate 45 the margins of the side guide plates 46
ordinarily projecting above the level of the path of the
and 47 are urged by the springs 51 and 55 against the
lower surface of the supporting platform of a pallet
pallet runners so that complete bridging for guiding of
moved along said conveyor, said strap guide plate having
the strap between the runners is accomplished. It should
a cam surface against which the pallet cams to cause the
be observed that the side guide plate 47 rests on top of 30 strap guide plate to be lowered as a pallet is moved over
the guide plate 45 while the side guide plate 46 is below
it along the conveyor, biasimeans for urging the strap
guide plate upwardly so that it presses against the bottom
it. The reason for this is to allow feeding of the straps
surface of the supporting platform of the pallet moved
15 and 16 in the direction of the arrow 60 without snag
ging at the edges of the overlaps. If it is intended that
over it and thereby provides a braking action against
strap feed should be in the opposite direction, the over 35 the pallet to arrest the gravitational movement of the
pallet down the incline of the conveyor.
lapping would preferably be opposite also and this can
be accomplished by rotating the entire device 180 degrees
5. The combination in strapping apparatus for strap
in a horizontal plane.
ping a pallet of a type having spaced apart support run
In order to accommodate the proper overlapping of
ners below a load supporting platform, comprising, a
the plates 45, 46 and 47, the plate 45 is depressed in the 40 conveyor, a strapping station on said conveyor, a strap
region of the plate 47 and tapered upwardly toward the
guide plate mounted for limited vertical movement at
region of the plate 46 so that both sides of the upper
said strapping station with its upper surface ordinarily
surface of the device contact the plane of the lower sur
projecting above the level of the path of the lower sur
face of the pallet platform.
face of the supporting platform of a pallet moved along
It should be noted that the spring biased plates 46 and 45 said conveyor, said strap guide plate having a cam sur
47 provide a braking action for the pallet as they bear
face against which the pallet cams to cause the strap
against the inner side Walls of the pallet runners and
guide plate to be lowered as a pallet is moved over it
this is in addition to the braking action provided by the
along the conveyor, bias means for urging the strap guide
entire guide plate 45 pressing upwardly against the bottom
plate upwardly so that it presses against the bottom sur
surface of the pallet platform.
50 face of the supporting platform of the pallet moved over
Although only certain embodiments of the invention
it and thereby provides a braking action against the pallet
have been shown and described it should be understood
to arrest movement of the pallet along the conveyor.
that the invention can be manufactured in many different
6. The combination in strapping apparatus for strap
ways without departing from the true scope of the in
ping a pallet of a type having spaced apart support run
vention as de?ned by the appended claims.
55 ners below a load supporting platform which is provided
I claim:
with an open bottom strap opening extending transversely
1. The combination in strapping apparatus for strap
of the support runners, comprising, a conveyor, a strap
ping a pallet of a type having spaced apart support run
ping station on said conveyor, a strap guide plate mount
ners below a load supporting platform which is provided
ed for limited vertical movement at said strapping sta
with an open bottom strap opening extending transversely 60 tion with its upper surface ordinarily projecting above
of the support runners, comprising, a strapping station, a
the level of the path of the lower surface of the sup
strap guide plate at said strapping station, and bias means
porting platform of a pallet moved along said conveyor,
for urging said strap guide plate upwardly against the
said strap guide plate having a cam surface against which
bottom surface of a pallet positioned at said strapping
the pallet cams to cause the strap guide plate to be low
station to bridge across said open bottom strap opening. 65 ered as a pallet is moved over it along the conveyor,
2. The combination in strapping apparatus for strap
bias means for urging the strap guide plate upwardly so
ping a pallet of a type having spaced apart support run
that it presses against the bottom surface of the sup
ners below a load supporting platform which is provided
porting platform of the pallet moved over it to bridge
with an open bottom strap opening extending transverse
across said open bottom strap opening and also thereby
ly of the support runners, comprising, a strapping station, 70 provide a ‘braking action against the pallet to arrest
movement of the pallet along the conveyor.
a strap guide plate at said strapping station, bias means
for urging said strap guide plate upwardly against the
7. The combination in strapping apparatus for strap
bottom surface of a pallet positioned at said strapping
ping a pallet of a type having spaced apart support run
station to bridge across said open bottom strap opening,
ners below a load supporting platform which is provided
and stop means for ordinarily limiting the height of the 75 with an open bottom strap opening extending transversely
3,031,816
7
8
of the support runners, comprising, a strapping station,
and a strap guide at said strapping station positioned to
runners below a load supporting platform which is pro
vided with an open bottom strap opening extending trans
versely of the support runners comprising, a strapping
station, and a strap guide plate at said strapping sta
contact the bottom surface of a pallet positioned at said
strapping station to bridge across said open bottom strap
opening, said strap guide being laterally adjustable so
as to ?t between differently spaced pallet runners, the
tion positioned to contact the bottom surface of a pallet
positioned at said strapping station to bridge across
said open bottom strap opening, said strap guide plate
adjustability of said strap guide being obtained by hav
being supported on a compression spring housed in two
telescoping tubes, one of said tubes being connected to
8. The combination in strapping apparatus for strap 10 the strap guide plate and the second being in contact
with the base of the strapping station.
ping a pallet of a type having spaced apart support run
ll. The combination in strapping apparatus for strap
ners below a load supporting platform which is provided
ping a pallet of a type having spaced apart support
with an open bottom strap opening extending trans‘
runners below a load supporting platform which is pro
versely of the support runners, comprising a strapping
vided with an open bottom strap opening extending trans
station, and a strap guide at said strapping station posi
versely of the support runners comprising, a strapping
tioned to contact the bottom surface of a pallet posi
station, and a strap guide plate at said strapping sta
tioned at said strapping station to bridge across said
tion positioned to contact the bottom surface of a pallet
open bottom strap opening, said strap guide being lat
positioned at said strapping station to bridge across
erally adjustable so as to ?t between differently spaced
ing it divided into two or more overlapped sections
which are movable on each other.
pallet runners, the adjustability of said strap guide being
20
said open bottom strap opening, said strap guide plate
being supported on a compression spring housed in two
vertically positioned telescoping tubes, one of said tubes
being connected to the strap guide plate and the sec
overlapped sections being ordinarily biased by bias means
ond being in contact with the base of the strapping sta
to provide the guide with‘ its greatest width, said over
lapped sections having camming surfaces against which 25 tion, one of said tubes having a laterally projecting pin
engaging a longitudinal groove in the other tube, the pin
the inside walls of the runners of a pallet can cam to
and groove allowing for vertical movement of the strap
automatically adjust the width of the strap guide to the
guide plate by an amount equal to the length of the
inside width of the space between the runners as the pal~
groove whose ends act as stops for said pin.
let is moved over the strap guide.
12. The combination in strapping apparatus for strap
9. The combination in strapping apparatus for strap
ping a pallet of a type having spaced apart support run
ping a pallet of a type having spaced apart support run
obtained by having it divided into two or more over
lapped sections which are movable on each other, said
ners below a load supporting platform which is pro
vided with an open bottom strap opening extending trans
versely of the support runners, comprising, a conveyor,
a strapping station on said conveyor, a strap guide plate
mounted for limited vertical movement at said strapping
station with its upper surface ordinarily projecting above
the level of the path of, the lower surface of the sup
porting platform of a pallet moved along said conveyor,
said’ strap guide plate having a cam surface against which 40
the pallet cams to cause the strap guide plate to be low
ered as a pallet is moved over it along the conveyor, bias
means for urging the strap guide plate upwardly so that
ners below a load supporting platform, comprising, a
strapping station, and a strap guide at said strapping
station positioned to contact the bottom surface of a
pallet positioned at said strapping station, said strap
guide being adjustable in width so as to ?t between dif
ferently spaced pallet runners, the adjustability of said
strap guide being obtained by having it divided into two
or more overlapped sections which are movable on each
other.
'
13. The combination in strapping apparatus for strap
ping a pallet of a type having spaced apart support run
ners below a load supporting platform, comprising, a
it presses against the bottom surface of the supporting
strapping station, and a strap guide at said strapping
platform of the pallet moved over it to bridge across said
open bottom strap opening and also thereby provide a
braking action against the pallet to arrest movement of
station positioned to contact the bottom surface of a.
pallet positioned at said strapping station, said strap
the pallet along the conveyor, said strap guide plate
ferently spaced pallet runners, the adjustability of said
strap guide being obtained by having it divided into two
being laterally adjustable so as to fit between differently
guide being adjustable in width so as to ?t between dif
spaced pallet runners, the adjustability of said strap 50 or more overlapped sections which are movable on each
other, said overlapped sections being ordinarily biased
guide plate being obtained by having it divided into two
by bias means to provide the guide with its greatest width,
or more overlapped sections which are movable on each
said overlapped sections having camming surfaces against
other, said overlapped sections being ordinarily biased by
which the inside walls of the pallet nunners can cam to
bias means to provide the strap guide plate with its great
est width, said overlapped sections having camming sur 55 automatically adjust the width of the strap guide to the
inside width of the space between the runners and pro
faces against which the inside walls of the runners of a
vide braking of the pallet as the pallet is moved over the
[pallet can cam to automatically adjust the width of the
strap guide.
strap guide plate to the inside width of the space between
the runners as the pallet is moved over the strap guide
References Cited in the file of this patent
60
plate.
UNITED STATES PATENTS
10. The combination in strapping apparatus for strap
ping a pallet of a type having spaced apart support
2,632,381
Buckland ______ __,____,__ Mar. 24, 1953
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