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Патент USA US3092276

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June 4, 1963
Filed July 18, 1960
Ed Win W DeKonÃIì/y
United States Patent O Mice
Patented June ' 4, 1963
ing a forming stack, such holders being located on either
side of the conveyer and being pivotable about axes paral
leling the conveyer. These are pivotable between a low
ered position, wherein the holders deiine a support plane
Edwin W. DeKoning, 8205 SW. Hunziker,
Portland, Greg.
Filed July 18, 196i), Ser. No. 43,512
3 Claims. (Cl. 2114-6)
for a stack, to a raisedV position, wherein they have swung
upwardly and away from each other. The holders are
swung to a raised position by pushing a layer of boards
about to be added to the stack against'their under sides,
:This invention relates to a stacking mechanism or
and in their raised position, such a layer may be moved
stacker, for stacking boards or similar bodies in a pile.
The invention is characterized by a number of features 10 beyond the holders and take its place against the bottom
that make possible a relatively simple construction for
the stacker. 'I'he stacker is easy to run and dependable
of the stack.
, .
Still another object of the invention is to provide a
stacker mechanism which also includes means for remov
ing a stack from the `stack-supporting structure after it
In general terms, the stacker of this invention com 15 is formed, so as to free the structure for the production
of a subsequent stack.
prises a conveyer defining a path of travel for boards,
Still another object is to provide a construction wherein
with the boards traveling sidewise on and with their ends .
the boards automatically tend to align themselves as they
on either side of the conveyer. Positioned above the
form a stack. The stack is shifted slightly up and down
conveyer is stack-supporting structure, operable to sup
port a forming stack. Movable up and down and through 20 as boards are added thereto, and this movement is used to
produce an aligning action in the stack.
, .
the path of travel defined by the conveyer is hoist mech
Other objects and features of the invention will become
anism which may be actuated to elevate a series of edge
more fully apparent as the following description is read
butted boards from the conveyer and to move such boards
in conjunction with the accompanying drawings, wherein:
into the bottom of a forming stack. The stack-support
FIG. 1 is a side elevation of apparatus constructed
ing structure is constructed to enable boards to be moved
according to this invention, illustrating conveyer belts in
up through the bottom thereof, but prevents the return of
the apparatus defining a path of travel for boards and a
boards when the -hoist mechanism is returned to a position
support plane for these boards, hoist mechanism for lift
below the conveyer. In this way, successive layers of
in operation, and produces regular and orderly piles, sub
stantially automatically and with little supervision.
ing boards from the support plane defined by the belts, and
boards are added to the stack from the bottom of the
30 structure over the upper runs of the belts for supporting
Thus, a general object of the invention is to provide
an improved construction for a stacker, wherein boards
are added to the stack `from the bottom, and the weight
a forming stack;
FÍG. 2 is an end elevation of the apparatus illustrated
in -FIG. l with portions removed; and
FIG. 3 illustrates holders for a stack in the apparatus,
35 showing them in one of the positions they occupy during
tioning of boards in the stack as it forms.
the forming of a stack.
When layers of >boards are added successively to the
Referring now to the drawings, in the embodiment of
bottom of a stack, a construction is possible wherein the
the invention illustrated, 10 indicates generally the frame
place of addition to the stack automatically may be main
of the apparatus, including verticals 12 »and horizontal
tained at a constant height. This -is because it is only the
top of the stack that rises as the stack grows. Thus, by 40 members 13 mounting hoist mechanism 14 provided for
lifting boards into a forming stack, and stack-supporting
this invention, it is possible to employ a ram or »fluid motor
-structure indicated generally at 16 for supporting a form
for actuating the hoist mechanism having a fixed length
ing stack. Also mounted on frame -10 is `an elongated
of stroke. Whether the stack be high or low, the hoist
belt conveyer means 18, for transporting boards into a
mechanism moves the same distance during the addition
of boards. Obviously this simpliñes the control and con- ,45 position wherein they may be fed by the hoistmechanism
14 into stack-supporting structure 16.
struction of the stacker. A further feature and object
Specifically, belt conveyer means 18 comprises plural,
of the invention, therefore, is to provide a stacker having a
of the forming stack is employed to promote orderly posi
hoist mechanism with substantially a fixed length of
stroke producing addition of boards to the stack.
ln an embodiment of the invention, plural lifters are', 50
contemplated spaced to clear the upper runs of belts in
relatively smooth-surfaced and laterally spaced belts 20
substantially parallel to ione another and with horizontal
upper runs 20a defining fa support plane 4for boards and
a path of «travel for boards with the boards traveling from
left to right in FIG. 1. Boards, such as boards A21, travel
the conveyer when they are raised to lift a series of boards.
isidewise on »the conveyer and with their ends on opposite
Such lifters have bounding edges or surfaces facing the
sides -of the conveyer. The feed ends of vthe belts 20
feed side of the conveyer that define an upright plane
extending transversely of the conveyer. When the lifters 55 are trained over pulleys 22 isupported by a pulley shaft
23 on horizontals 24 of the frame, and .thebelts at the
are in a raised position, these bounding edges function as
end `of the conveyer meanstravel over pulleys
a stop means preventing forward travel of boards on the
26 supported by a pulley shaft 27 and brackets 28 on
conveyer beyond the feed side of the lifters. An object
verticals 12. Drive to the belts is by 'a motor 30 con
of the invention is to provide a construction wherein 60 nected to shaft 27 mounting pulleys 28 by a chain 3.2.
smooth-surfaced conveyer belts are used to transport.
In a preferred embodiment, the belts normally are driven
boards, and the hoist mechanism comprises lifters as
constantly, and hoist mechanism 14 is operated intermit
described, whereby when the lifters are raised, further
tently to raise a layer of -bo‘ards olf the support plane
feed to the means stacking the board may be `automatically
defined by the belts. - During the time that. the hoist
stopped, without actually stopping the conveyer. On low 65 4mechanism is operated, forward travel of. boards on the
ering the litters below the conveyer belts, forward move
ment of boards is again permitted and any backlog which
may have collected on the conveyer automatically then
belts is stopped, and a backlog of boards may build up
on the conveyer means. By .¿“relativel-y smooth-surfaced”
belts, it is intended .to describe-belts constructed to enable
moves into a feed position on the lifters.
boardsv to slide over their upper -runs should forward
Another object of the invention is to provide novel 70 travel of the boards be stopped and the conveyer left
running, -as compared »to belts with lugs or similar- devices
stacking apparatus which includes novel elongated hold
ers providing the bottom of a support structure for hold
where positive traction is produced.
Nearthei‘o?fbearingend of the lconveyer is a stop or
noted thatV one of the lip portions is somewhat wider
.abutment means 40. .This is mounted on the »frame `and '
disposed adjacent the support plane delined by the upper
than the other.` Thus, on vthe about-to-beY-added layer
moving upwardly, the shorter lip moves completely to
belt Iruns.
Stop means 40 functions to index the forward
one side :of the ends of the boards in the layer being
_..edge-.fofal-ayer lvof boards. „A boardtraveling down the
„conveyer reachestheystop meansand is aligned by. this
». .preparationforlp‘lacing a‘newlayertof boar-ds in a Stack.
added to the stack before the longer lip does. This
results in the stack above the lips being supported «at
one end only on one of the lips (the longer lip) and
momentary tilting of the stack above the holders, as
illustrated in FIG. 3. When the shorter lip moves free,
the stack above the lips is supported'at one end by the
layer of boards being added, «and at its other end by
:Hoist mechanism 14 comprises plural lifters, .indicated
¿the longer lip. The tilt is toward wall 66, and kthis tilt
' means: transversely. ofthe conveyer, and its forwardn travel
„issgtopped . Succeeding.boardstraveling down .the con
¿ yveyerebacleup fromfthe tirstlboard. inthis aligned position.
-Ultimatelyaseries of edge-«buttedjboardslis vformed in
.at 46,..joined byxa .common :base„48. ¿The lifters have
is relied upon to vpromote end aligning of boards.
Explaining the operation of the device, with motor 30
end 'of the belts, and dat, elongated upper surfaces or l5. `running, boards ¿as they are deposited, on belts 20 travel
.«the _lowered position of
from rightto left in FIG. l, with the lead board finally
*F.‘IGSaltand 2 Aandebelow thesupport .plane of the belts.
. Icontacting stop means 40'. Succeeding boards pileup
. .substantially vertical vedges .for snrfacesSG. facingthe feed
1 Theupperfedges »of .the lifter-s define a common support
behind the leadjboard, on the upper runs of the belts.
Nplane for boards, which substantiallyparallels the ‘support
- When suñ‘icient boards ha've collected to completely cover
plane of the belts, when the liftersareLraised .to the
AA«raised Aposition indicated VbyA dashed lines in FIG. Zand
r'When the 'lifter-s lare ,shifted .jupwardly, their bounding
upper surfaces _52, ram 54 is actuated to raise the litters.
.gabovelthe suppontplane of nbel-ts 20... Hoistmechanism
«also .comprises a ramon liuidrmot-or 54,-having a stroke of
edges 50' extend vertically upwardly from the support
,plane of the belts, andV these .edges constitutey abutment
«fixed length,j connected-to the-litters and operable when
»actuated to raiseandlower >the.lifters.
Yoffbearing end of the eonveyer beyondthese edges.
means preventing forward >travel of boards toward the
lWithlreference ».to- the support *structure` ‘16, 'this Vcorn
Y andlone on the other -sideof the conveyer. . These deñne
The lifters :are shifted'upwardly until after the boards
carried thereon haveY moved between and beyond the arcs
»of the holders, and thisY occursiat the end of the stroke
.of ram 54. With the boards on the lifters above the
. a«bottom~for«thestructureand constitute avyieldable
Y- holding«»means. Thus, the . holders are mounted ifor
.'holders, .the holders fall back to their lowered position.
Thelifter-s `are then to be returned to'their lowered posi
-» . prises » a-.pair l of- elongated holders 56, 57v paralleling . the
» upper `runs of the Vconveyer and disposed one on one side
.pivotal-movement-‘about longitudinally extendingaxes on
tion by contraction of ram 54. . After their top surfaces
`>`shafts »58. Such-»shafts-accommodate movement of the
.. holders »from theglowered position illustrated tofthe raised
move below runs 20a, boards building up as avb-acklog
on the runs may move forwardly, and the cycle may
position shown in dashed lines in FIG.l 2. _In moving
then berepeated.
« .between l“lowered-and raised positions-lips or- `lumber
supporting portions-60,V4 61 »pivot inl arcs upwardly` and
It will -be vnoted that each layer of boards »added to
. .the stack .requires the same extension lof ram 54.
vlocation where addition takes place is always atr constant
Aofboardselevated 1by-the lifters can pass between and
beyond the holders. Gravity acts toreturn >the holders 40
» ¿to `their-lowered position lafter boards~clear the same.
It is elaimed'and desired to> «secure by Letters Paten-t:
1. VStacking mechanism'for lumber comprising, a frame,
The »loweredffposition isdetermined byl stops 62.
- means on the frame deñning a path for boards with such
«Alsopart--of the «supportstru‘cture -1-6-are walls-64, _66
boards traveling »sidewise over land with ends on opposite
«extending~~vertieally»upwardlyfrom the support plane of
sides of said path, opposed `elongated holders mounted
Äthel holders. V-Tlïhese-ooniìne the endsf of boards forming 45 above. and substantially paralleling said path, one on one
«the stacking-the apparatus. ~As will be described, the
side. and one .on the «other sideof said path,rpivot means
Smolders are «constructed so that «a »tilt is imparted to a
pivotally mounting 4the holders for movement between
stacksnomentarily asboards-areradded to its bottom, andA
lowered .and raised positions aboutv axes _Substantially
thisrtilttendstolshift boards toward wall 66 whichfunc
tions as an end-aligning wall.
For moving a completed ~stackvfromsupport structure
-16,~ an -upn'ght .pusherv means -SD-eXtendingin `a vertical
Y- paralleling said path, said holders having lumber-sup
50 porting portions> that project .towards each other inv a
--plane -fupwardly-ffromfthe holders -and set. normally of
lowered position for the holders and that support the ends
Í Vof boards in this position, said lumber-'supporting portions
swinging upwardly and away from each other in diverg
'I the holders isincluded. This is mounted adjacent .one
set of ends of the holders. ' Duringthe'forming of'a stack,
55 . lowered «to amai-sed position, hoist means for lifting boards
pusher means '-80' may assistin guiding one set of edges -of
. from said path yand moving -them between and then beyond
boards~in the stack. After-a stack has beenY formed,
pusher means I80'is shifted fromright‘to left in FIG. 1,
said holders, said holders swinging from their lowered
using ram orrnotor `86, which causes the stack to «slide
ing Varos'on. pivotal movement of the holders from a
to their raised position to accommodate ,movement of
boards therebetween and being constructed to'return to
offA of'holders56, 57 »(wi-th' lips 60‘,l 61 -funetioningras 60 their lowered. position after boards move therebeyond,
VAguides) onto mechanism» such as a conveyer k84 which
and end~aligning structure extending vertically upwardly
'then removes the formed stack.
With particular reference-now to FIGS. 2 «and 3, when
the lifters Iare shifted upwardly »and ñrst'start their move
from adjacent #oney ofsaid holders constructed to align
the ends of boards supported on said holders when such
ends engage `the structure, the lumber-supporting portions
ment, boards positioneddabove surfaces 52» and resting 65 of said holder-s having -a construction causing boards
on belts v20V (which will bepreferred Vto as a layer -of
resting on the holders,r to tiltrtoward said end-aligning
boards to‘be `added to the stack) are raised from the plane
structure during movement of- the holders from their
of belt runs 20a.
0n- eontinued movement of the lifters
lowered to their rai-sed position.
2. ~In mechanism for stacking lumber, a frame, means
boards come into contaotwith the under surfaces of lip 70 on the frame `defining a path of travel for lumber, elon
gated opposed holders substantially parallel to each other
_portions 60,`4 61. ` Further-_movement of -the lifters up
wardly ycauses these ends to pivot the holderslwith the
and disposed above said path of travel, said holders having
upwardly the the ends of the about-to~be~added layeraof
lip pontions 'ofy Athe holders swinging upwardly. rWith
lumber-supporting portions that normally occupy ' a
such swinging of thek holders any stack resting on top
lowered position and that in this lowered position extend
` of the lip portions also is'shifted upwardly.' It will be 75 towards each other and denne la support plane for stacked
movement yabout longitudinally extending axes and ac
swing up and away from each other, means >for shifting a
layer of rboards upwardly from below said holders to
lumber, pivot means mounting said holders for pivotal
commodating movement of said lumber-supporting por
Kabove said holders, aligning structure extending upwardly
tions lupwardly and away from each other :to a raised
from adjacent `one of said holders, said holders having a
position, hoist means -for lifting lumber from said path
construction producing shifting of boards ’toward said
of travel tand moving such lumber between `and then
aligning structure when they are raised from their lowered
beyond said holders, aligning structure extending up
wardly from adjacent one of said holders, said holders
having a vconstruction producing `shifting of lumber there
`on toward said aligning structure when they are raised
lfrom their lowered position, and means for removing
lumber from said holders comprising ejector mechanism
disposed above said holders and mounted for movement
in a direction extending longitudinally of said holders.
3. In mechanism `for »stacking boards, elongated op 15
posed holders substantially parallel to each other for
holding the ends :of -a layer of boards, means mounting
said holders enabling inner portions of the holders to
References Cited in the tile of this patent
Midnight ____________ __ Sept. 22, 1959
More ________________ __ Feb. 9,
Edmonds ____________ .__ Apr. 19,
Watanabe ____________ __ Feb. 7,
Wilson ______________ __ Dec. 19,
Norway ______________ __. Oct. 14, 1912
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