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Jan. 1_4, 1947. '
Filed March 3,- 1945
3 Sheets-Sheet 2
Jan. 14, 1947.
Filed March 3, 1945
y 2,414,164
3 Sheets-Sheet 3
Patented Jan. 14, 1947
2,414,164 `
`l'olm R. Nalbach, Oak Park, Ill.,-- assignoi'ï‘ toA
Middleby-Marshali @ven Company, Chicago,
Ill.,` a corporation of Illinois
Application March 3, 1945,' Serial No.' 580,763
.The invention relates to improvements in con
One object of the invention is to provide an
(c1. 19a-153)
like manner whether the conveyor movesinV one
direction or the other.
An additional object of the invention is to
endless" conveyer mechanism provided with kim
provide rotary means for transferring the swing
proved mean’s for stabilizing trays carried by the
able ends of pivoted trays of a conveyer‘in
conveyor as thev trays move arcuately about’end
synchronism with the movement of the pivotal
sprockets of the' mechanism~ The mechanism '
axes of the` respective trays as the axe-s' move
herein shown and described is adapted for use
arcuately about conveyor» sprockets andïmeans
in' bake ovensV of the so-called traveling type but
»cooperating with the rotary transfer mea-ns? af
the invention is not limited to such use.
l()v fording positive engagement with the swingable
In traveling ovens a> pair of endless chains-hav
tray ends whereby lengthwiseshiftirig oi’r other
ing horizontal runs and passing at the ends
of movement of the trays is-preven'ted
around sprockets generally are employed `for mov
during the transfer thereof from one horizontal
ing trays within a baking` chamber, which trays
run of the conveyer to the otheri»
carry pans of` products to be baked. The trays 15
s. further object of the invention is to provide
generally are attached pivotally to the chains
a wholly cam-controlled. tray-gripping mech
and-in stabilized tray ovens the` trays are re
anism for swingable ends of` pivotedtrays for
strained from tilting- during their passage within
effecting positive. supporti of said tray ends by
the baking chamber since tilting of the trays and
tray transfer means during those` quadrants- of
the pans .of dough or` batter carried thereby pro 20Y movement of the `latter during which axial shift
duces final products that may be unshapely or
ing of the trays is- most likely to occur.
non-uniform and hence less desirable com
Another object of the invention is to provide
In effecting' the stabilization of such pi'votally
supported trays-»stabilizingmechanisms of vari
ous forms have been designed» and» some of which
havebeen used commercially butnot infrequently
smoothly acting tray transfer mechanism
adaptedl for vuse under temperature' conditions,
as in bake ovens, that renders the use’of con
ventional lubricants as Well as springs non
such mechanisms `have comprised arcuate guid
ingtrack at the ends of the conveyors which,
Other objects of the» invention relate to various
of construction Vand arrangement of
in conjunction Vvwith other apparatus, have been 30 parts `that will be apparent from’a‘consider'ation
calculated to retain the trays in horizontalrela
of the following specification and accompanying
tion as the same move arcuately in succession
drawings, wherein:
from one horizontal run. of the‘conveyer to the
Fig. 1 is a broken vertical longitudinal sec
tional view of a bake oven‘comprising conveyor
mechanism that-is illustrative of the presentim
other. However, the-movement oftray rollers
along suchlarcuate tracks frequently is accom
panied by irregularity in tray action, due pos
sibly to imperfection or wear‘or misalignment of
parts, andfwhichedoubtless is augmented by the
changes in dimensions-of the‘several parts due
tothe various temperature ranges `under which
commercial bake ovens necessarily are operated
to bakingJ various products.
It is animportantobject vof the present inven
tion to provide mechanismuwhich. instead of mov
ing tiltable: ends of trays‘a‘long curved tracks for
stabilization purposes,` Aa‘ctually‘carries or trans
ports such trayend’s durin'gïr the arcuate move
ments thereof'îandï-thereby avoids the chattering
` and; otherirre'gulari‘tiesfin tray action above'men- l
, A morefspec’iñ’c objec-t’ofithe invention‘is‘ to
'provide‘tray stabilizing means that'may be em
ployed with» \ equal facility at the ’ :forwardV and
rearff ends " of- a ~- conveyorl and thatI functions in"
Fig. 2 is a broken top plan View illustrating-the
conveyor mechanism and certainï baking cham
ber framing members‘that support the conveyer
mechanism, the insulation of the walls and other
. features ofthe bake> oven not essential to the
present improvements» -being omitted.
Fig. 3 isran enlarged broken vertical sectional
view takenon line r343- of Fig.` 2.
Fig. 4 is a sectional View takenon lined-‘4
of Fig. 3l but with the transfer arm assumed `to
be in upright position._
Fig. 5 is an enlargedbroken vertical sectional
View taken on line 5~5fof Fig. l2.
Figs. '6, 7 and 8, are broken views-,of the cam
controlled apparatusshown in-Fig. `4 and illus
trates progressive positions of the mechanism `
during operation thereof.
Fig. 9 isa vertical sectionalview'taken online
l 9-9 of Fig. 5.
‘ 4
In Fig. 1 a bake oven of the so-called traveling
type is illustrated and generally, comprises a heat
insulating inclosure Il] defining a baking charn
ber II. The inclosure lo comprises walls sup
ported by suitable framing in the form of struc
tural steel members, indicated generally in Fig, 2
by the numeral I2.
Disposed, within the chamber II is a pair of
endless chains' I3 each having upper and lower
horizontal runs and passing over sprockets I4
and I5 at the front and rear respectively of the
The fro-nt sprockets It, one at each side of the
oven, may be mounted on a transverse shaft but,
preferably, for the purpose of providing adequate
vertical clearance between trays, the sprockets
are mounted on stub shafts I6 each journalled in
suitable bearings l'I supported by the frame I2.
The sprocket l5, at the rear of the oven, are
carried on stub shafts I8 which are journalled
in Vbear-ings I9 carried by horizontally slidable
structures each indicated by the numeral 20 and
which Vare supported by the framing members.
The slidable structures 2@ comprise springs 2l
respective tracks for engagement by transfer
mechanism hereinafter described.
As a tray 2i, such as the tray identified as
Zia in Fig. 3 approaches the sprockets Iâ at the
rear end of the conveyer, the rear pivotal mem
bers 23 there-of will be carried arcuately about
the sprockets to the upper run of the conveyer,
assuming `that the sprockets are moving in a
clock-wise direction. For the purposeof main
taining the trays 2l in horizontal relation as the
' rear pivotal ends are moved about the sprockets
V I6, rotary transfer means are provided which en
gage the forward ends of the trays and move
.them arcuately concurrently with the movement
of the rear ends, and release such forward ends _
for horizontal rolling movement upon the respec
tive upper tracks upon completion of such arcu
ate movement.
The transfer means shown comprises rotary
transfer arms 32 which are carried by stub shafts
33. Shafts 33are suitably journalled in bearings
carried by the respective sliding structure 20 and
hence the spaced relation of the shafts 33 with
respect to the sprocket shafts i8 is maintained
during shifting of the latter due to expansion
which urge» the structures 2B to the right, as 25 or contraction of the chains. The spacing of the
viewed in Figs. l- and 2 for moving the shafts i8
shafts 33 from‘the shafts' i8 is such thatthe
and'sprockets i5 to the right and thereby keep
transfer arms 32 will cooperate with the sprockets
ingjthefphains I3, taut during expansion of the
in retaining the trays in horizontal relation dur
chains and permitting sliding movement of the 30 ing the arcuate movement of the trays. The
sprockets l5 and shafts I8 in the opposite direc
arms 32 areshaped at the ends .to provide receiv
tion during contraction of the chains in response
ing means for rollers 39 and as shown arecpro
tdyarioustemperature conditions affect-ing the
vided with ñngers or extensions 3d. The shafts
same.- VThe sliding structure is more fully shown
33 are shown in Fig. 2 as being driven in syn
in my Patent No. 2,369,840, granted February 20, 35 chronism with the shafts I8 by chains 35, " » .
As the tray, identified as 21a in Fig. 3 nieves-to
VSecured to'the inner verticalside walls of
the left from the position therein Shown to the
the baking chamber, as to _the framing l2, are
position of the tray identified asZ'Ib, it will be
upper and lower horizontal tracks 22 and 23 at
seen that the lower fingered of arm 32 will have
eachsideof the oven. rI‘he tracks are shown as 40 been movedinto contact with the roller 30 of the
formed of angle‘shaped steel members upon which
the upper and lower horizontal runs of the chains
aresupported and along which they, in effect, roll
by Vreason of the conventional rollers 24 provided
tray. It will be understood that a transfer mech
anism is provided at each _side of the rear por
tion of the oven and that they operate in syn
chronism and hence but _one only will be de
on the link pins 24a of the chains. The conveyer,
scribed. However, any lifting action exerted by
comprising the. two chains I3 and other asso
the finger on the roller 38 of the tray 2lb will
ciated load handling mechanism, is driven by any
not be eifective in retaining Vthe tray horizontal,
approved means, as by a motor 25 shown on the
if in fact the ringer Will produce any initial ele
top_of the oven. The motor by means of a chain
vation of the forward end of the trai7 when the
25, drives the shaft I6 (if a single transverse shaft 50 latter is in the position of tray 2lb. It has been
only isemployed) or by two such chains 26 in the
common practice heretofore to vprovide auxiliary
event .two stub shafts I6 are provided, as pre
means for »cooperating lwith the- transfer arms
Íerred. The conveyer may be driven in either
at this point, such as Vcurved arcuate tracks along
direction '.preferably, as by utilization oí a re
which the rollers 39 are forced by the fingersV 34
versible -motor'or by suitable reversing mechanism 55 and other associated mechanisms. Such curvedV
tracks and'associated mechanisms are dispensed
(not shown) in the driving means.
with by the present improvements since in many
VA plurality of trays 21 are shown which are
instances the arcuate movements imparted to the
movable by the chains I3 and‘upon Which'pans
trays were irregular, or jerky, whereas operation
of bakery products to be Abaked may be placed
forA movement 'within theY baking chamber. The 60 free of vibration'is desirable not only from the
standpoint of durability but from the standpoint
of uniformity in finished products; Hence, in
stead of a rolling transfer movement at the`for-‘
the members 128 constituting extended link pins
ward 'end lof the trays, Said‘ends are- .actually
by means of which the trays are attached to the
chains. 'Such pins 2B are located at or adjacent 65 transported bodily >from one run to the other
similarly tothe rear ends. The improved means
theA rear of» the trays- and hence the trays are
for effecting the engagement of the forward tray
swingable Y about the respective pins 28. The
' ends and effecting> the transfer from one run of
forward endsl of the side walls of the trays are
traysy ì'lare shownL secured to rear pivotal mem
bers 28T at opposite lateral edges of the trays,
provided with laterally extended pins 29 which
carry rollers 3o kwhich are designed to engage 70
the inner» marginal portions of the respective
tr'acksfor supporting the trays in horizontal re
lation âS the trays move with the chains during
theghorizontal runs of the latter. The rollers 3B
l extend >inwardly of the inner margins of the 75
the conveyor to the other will now be described.
As shown in Fig. 3, the transfer arm‘ 32 therein
illustrated (the rear arm on the opposite `side
of the oven being similar>wis provided with two
similar hooks or cradling members 36, 31, each~
pivotally attached to the arm at’38, 39 respective-_
ly. ,The hooks A3,6, 31 aresymmetricallyarrangecl
with respECt to the respective nngers 3ft at the
ends of the arms and both hooks will assume a
given relation with respect to the associated fin
hooks 36; .31, which as stated are `pivotallv at
tached to the arm 32 at 38, 39 respectively com
prises a link ¿lil for each rear stabilizing mech
ger 3ft in any given position of rotation of that
finger.' Hence, viewing Fig. 3, as a tray 27 on the
lower run ofthe chain moves to the left from a
anism‘, which links are generally ring shaped
with openings ¿Bw of suilicient diameter to re
ceive the respective shafts 33 and the hubs 32a
position not therein shown", to the position where
in-the forward roller 3@ is directly beneath the
of the arms 32 and permit movement of the links
relative to said hubs.` To a link fit, a coopera
shaft 33, the hook 35 will be in the lowermost
dotted line position shown in said figure, that 10 tive pair of hooks 36, 3l is pivotally attached -by
pins lil, 42, respectively. The pins lll, ¿i2 extend
it will- be in engagement with the roller. As the
from the hooks 36, 31 through the adjacent por
tray- 21 moves to the position of tray identiiied
tions of the links ed and are provided at the
asilo; the hook Sii being in engagement with
ends with rollers llt, fili which roll upon the ex
the roller 3G will actually lift the forward roller
from the lower track to the same extent and at 15 ternal peripheral surfaces of a disc shaped plate
cam d5 that is non-rotatably supported by means
the same rate of elevation as the axial pin 28 is
of brackets 46 to the slidable structure 2l@ where
being’arcuately elevated in moving about the
by the parts described maintain c-ooperative re
sprocket i5. The effective radius of arm 32 is
lation with respect to the shaft I8 during expan
the same as the effective radius of the sprocket
sion and contraction of the chains i3.
and hence theY tray is maintained in a horizon
The cam 45 is provided with an aperture 45a
tal relation as it is moved arcuately upwardly as
described. When the arm 32 has reached the in
.through which the associated shaft 33 extends,
the cam, as stated being non-rotatable.
termediate horizontal position shown in d-otted
lines, the tray will be in the position identified
by tray 27o and during the arcuate movement
of the tray from the lower track through the
lower left quadrant to the position of tray 2`lc,
axis of rotation of shaft 33 as the cam center,
are approximately equal but various portions of
the surface of the cam periphery along which
rollers d3, Il@ travel are of different configura
the forward roller Sii will have been retained or
tion whereby the hooks 3d and 3l are constrained
to move into the operative position of hook 3S
of Fig. 3 whenever either hook tâ or 3l is dis
posed in the lower left quadrant of rotation
shown in Fig. .3. The rollers d3, dit being'con
nected to the link ¿lil by pins lill and ¿i2 and the
cradled within the hook member 3S. During the
movement of the finger 3ft, through the next
quadrant, that is, from the intermediate hori
zontal left hand position of Fig. 3 to the vertical
position, the finger adequately supports the roller
30 andthe hook progressively backs away from
the roller during such movement of the finger.
In" substantiallythe upper vertical position of
the arm 32 the tray will occupy the position des
ignated 2lb, the roller Si) will move from the end
of arm 32 into rolling contact with the upper
track 22, the roller having been released‘from
engagement yby the hook due to the withdrawal
or retarded movement of the latter just described
and illustrated in dotted lines in Fig. 3.
Substantially concurrently with the horizontal
rolling movement of roller Si) upon the track 22,
the rear end of the tray, as represented by the
pivot pin 23, also moves into the track 22 for sta
various diameters of the cam, considering the
latter being carried by the hooks, constrain the
latter to move pivotally about their axis pins 38,
E9- into the operative lower left quadrant posi
tion of Fig. 3 and- into inoperative positions dur- `
ing the remaining positions of the cycle.
In Figs. 5 to 9 inclusive, which disclose cam
P operated hooks for the forward portion of the
oven, the functioning of the hooks is more clearly
shown,` the novel transfer structures at the front
being identical in principle to the transfer means
at the rear of the oven. ‘
`Referring to Figs. 5 to 8 inclusive there is
therein` shown one of the two transfer means as
sociated with the front sprockets lli for retain
blized movement by the track throughout the
ingA the trays in stabilized relation as the piv
upper run of the’conveyer. During the move
otally mounted rear ends of the trays move in
ment of the ñnger 3a from the upper vertical 50 ysuccession
_about the sprockets it in moving
position to the lower vertical position the asso
from one horizontal run of the conveyor to the
i ciated hook 'i6 likewise performs no function
since within that portion of the cycle the finger
carries no load but the other hook and finger
tiñcation of position, is shown with its forward
however will be elevating the forward end of the
tray roller es in position to move oif the end of
succeeding tray as described above.
the upper track 22, it being assumed that the
’ The spacing of the trays and the relation of
forward Sprocket id is rotating in a clockwise
the parts participating in the transfer of the
direction. A forward transfer arm ¿il is shown
trays as described are such that the hooks 35
and 3,? alternately engage forward tray rollers 60 in vertical position with a finger ¿lâ in a substan
tial contacting position with the roller. A sim
for cradling the rollers during movement of the
ilar linger de is provided at the opposite end of
associated finger from lower vertical to horizon
the arm. >¿is the sprocket ill continues its clock
tal position and by a retarding action imparted
wise movement, the rear end of the tray 21e will
to the hooks during movement in the second
begin to move arcuately about the sprocket while
quadrant, the lingers only support the forward
the :forward end of the tray will begin_a like
rollers, Hence as each tray moves into position
movement and the tray will be retained in hori
where the rear pivotal axis thereof begins to move
zontal relation by reason of the fact that the ef
about'the rear sprockets l5, the forward end of
the respective trays will be engaged by one pair
or" the hooks 35, 3l and in cooperation‘with the
respective fingers of the transfer arms will re
tain the trays in horizontal relation during the
movement from one horizontal run of the con
fective radius of the arm ¿il is the same as that
of the sprocket ill. The finger d8 will adequate
ly support the roller 3i) during movement during
the ñrst quadrant of 90° of arc from the verti
cal position shown to a horizontal position and
hence during such movement the hook Ell, simi
The means for controlling the operation ofthe 75 lar to those above described, is in a non-engaging
or inoperative position. A similar hook 5i ispro
veyer to the other.
retained in that relation by the effective cam
dwells until the tray has moved into rolling con
vided at the other end of the arm‘41. » The hooks
5o, 5I like those described above, are swingably
secured to the. arm 41 by pivot members 52, 53,
and. to the hooks a ring-like link 54 is pivotally
secured at 55, 56 respectively. The pivotal pins
55, 55 as shown in Fig. 9, extend from the re
spective hooks through the link and at their
other ends carry rollers 51, 58 that are arranged
tact with the lower track, that is, until the arm '
32 is in the vertical position whereupon the hook
31, then in the lowermost dotted position of Fig. 3,
will by reason of the then effective portion of the
cam- surface, move counter `clockwise at a rate
>to free the roller for rolling contact to the right
along the lower-track 23.
to follow the peripheral surface of a disc-like
In like manner the forward stabilizing mech
cam 59 that is secured, as by a tubular bracket
anisrn will be operated when the forward sprock
60, to a plate 6l that, in turn, is secured to the
ets I4 rotate counter clockwise, as viewed in Figs.
upper and lower tracks 22 and 23. The link 54
5 to 8 inclusive. In that instance Fig. 6 illus
and the cam are, as those at the rear of the con
trates the hook 5l approaching the roller as the
veyer, ring-like to provide recesses that accom
latter moves towardthe position of Fig. 5. In
modate the hub of the arm 41 and the stub-shaft
Fig. 5 the hook 5| is in engagement with the
62 of the arm which is appropriately journalled
roller and will lift and cradle it during the next
in the Vframing of the oven. The shafts 62, there
90° of arcuate movement to the position of Fig.
being one on each side of the oven in association
'7. From the latter position, by counter clock
with the corresponding sprockets l4, are driven
wise movement to the position of tray 21e, the
in unison with the sprockets as by chains 63 20 hoc-k will be retarded, in eiîect, by clockwise
from sprockets upon the respective front sprock
movement on its pivotal axis since during such
et shafts i6.
movement the supporting end of the arm will
Referring to Fig. 6, the arm 4'! is shown in a
support the roller adequately.
position a few degrees of arc from the position
shown in Fig. 5 with the tray now identified as 25
extend above the level of the upper tracks and
2U lowered slightly from said position while in
below the level of the lower tracks when the arms
Fig. '7 the tray there identified as 27g is shown
in intermediate relation.
are in vertical position, out outs at the inner
As the tray 27 was
margins of the tracks are provided for such
carried into the horizontal relation of Fig. '7, the
movement as well as for accommodating the
hook 50 was cam actuated into engaging posi 30
movement of the hooks below the level of the low
tion with respect to the roller 30 since as the
er tracks when the hooks are in the positions
finger 48 approached the horizontal position its
indicated in dotted lines in Fig. 3 and in Fig. v5.
effectiveness as a support for the roller was re
In Fig. 2 for example the rear or right hand end
duced by change of relation. In Fig. '7 the hook
cradles the roller 30 and prevents the tray from
slipping forwardly, or to the right, and thus
moving out of stabilized horizontal relation.
of the upper tracks 22 are shown provided with
The hook 55 was moved from the position of Fig.
the upper track is provided to permit the rollers
3i) to be carried arcuately downwardly or up
wardly (depending on the direction of rotation
of the conveyer) as the rear ends of the trays
cut'outs or notches 64 on the inner rear edges
to provide clearance for the rotary transfer arms
5 to the position 4of Fig. 7 by the cooperation of
Vthe rollers 51, 58 and connecting link 54, the
rollers having followed the cam surface in mov
ing from their positions in Fig. ,5 to their posi
tions in Fig. '7. During the movement of the tray
from the horizontal position 21g, through posi
tion 27h of Fig. 8 to the lowermost position of
Fig. 5, the cam will, by reason of the configura
tion of the dwells over which the rollers travel
during such arcuate movement, retain the hook
55, as well as hook 5l, in the same relative posi
tions with respect to the arm as are shown in Fig.
Hence the roller 30 is effectually cradled or
supported by hook 5t and longitudinal shifting
of the tray is prevented by the roller engaging
A deeper notch 65 in each rear portionV of
move arcuately immediately >>from or toward the
level of the upper track under control of the rear
sprockets It.
To provide required clearance for thetransfer
mechanism adjacent the rear ends of the lower
tracks 23, the latter are provided with cut outs
or openingsßß through or into which the fingers
of the rear transfer arms 32 and the associated
hooks may pass as they move into engagement
with forward rollers 35 as shown in dotted lines
in Fig. 3. In Fig. 2 the openings 66 are shown
bounded on the inner sides by inward track ex
tensions G‘i that are welded to the inner edges
of the tracks 22 to provide greater supporting
hooks during the movement of the tray from the
position of Fig. '7 to the lowermost position in
dicated at 2li in Fig. 5. During the preceding 90°
areas for the rollers 35 at the position of pick-ups
arcuate movement, that is in the movement of
by the hooks or release thereof, depending on the
the tray from the position of Fig. 5 tothe posi
direction of operation of the conveyer.
tion of Fig. '7, the end of the arm' 47, including
At the forward end of the upper tracks, cut
the associated ñnger 48 adequately cradled or
outs or openings 68 therein are provided for ac
supported the roller 3B to provide the desired sta
commodating the upper portions of the forward
bilization of the tray.
chain sprockets i4. Such openings 68, in thefor
It will be apparent that upon reverse move
ward portions thereof extend to the inner edges
ment of the conveyer resulting in the rotation of
of the tracks to provide passage G9 to permit the
the front and rear sprockets and front and rear 65 tray pivots 28 to move downwardly from the
transfer arms in directions opposite from those
tracks, or upwardly through the tracks, .as the
above described, the same timed movement of
trays begin or terminate respectively their -arcu
the respective hooks will occur. For example in
ate movements at the forward end of theV con
Fig. 3, if the sprocket I5 be assumed to move
veyer. Such passages 69 would of course permit
counterclockwise, the upper end of the transfer 70 the forward rollers 3D of the trays to drop as
arm 32 will receive and support the forward tray
they move along the upper tracks at the forward
roller 30 until it has been moved approximately
ends of the upper tracks but to enable the rollers
to the horizontal position identified as 21e when
Sil to pass over the passages orV gaps 69 in the
the»V hook 31>wil1 have moved, by cam action, in
75 upper tracks, supplementary rollers 10 are pro
to cradling relation withthe roller and will be
vided onrthe upper tracks which engage the `side
edges Aof the trays before the rollers 3B arrive at
the gaps and hence rprevent the forward `ends
of :the `'trays from tilting downwardly by reason
of the passage of the rollers 3d over >the gaps 5S.
`'In the forward end portions of the lower tracks
into Vand from operative positions with respect
to the ends of said arms within particular por
tions of the paths of travel of said ends, a shiftable
link'member pivotally secured to each of said hook
members for swinging the same upon the respec
tive pivots to and from said operative positions,
23, cut outs or passages 'H are provided for ac
a fixed cam, and a pair of cam followers each
commodating the ends of the transfer arms 41
associated with one of said hooks for following
and the associated hooks Eil, e! as those portions
move into and from the lowermost positions for 10 the surface of the `cam during rotation of said
arm and each operatively connected to said link
engagement with or disengagement from the
for constraining said hooks to move in unison
front rollers 3G, depending on the direction of ro
into and from said operative positions sequen
tation of the arms.
tially during rotation of said arm.
By reason of the action of the cam controlled
3. stabilizing apparatus comprising a rotary
hooks which are carried by the transfer arms as 15
shaft, a transfer arm `mounted thereon and hav
above described, the forward ends of >the trays
are positively engaged by
Y the hooks in those po
ing opposed load supporting ends movable about
said shaft, a pair of load engaging hook ‘members
sitions within which the lingers of the transfer
each pivotally secured adjacent an end. of said
arms would be ineffective in lifting or supporting
the 'tray ends or might not restrain longitudinal 20 arm and swing-able to and from an operative posi
tion with respect to the respective arm ends, .a
shifting movement of the trays to provide the de
shiftable link member pivotally secured to each
sired positiveness of support or security. The
cam controlled mechanism including the de
of said hooks for eñecting concurrent swinging
scribed cooperating pairs of cam followers on
each pair of hook members and the links con
necting each pair of hook member, avoids the
use of springs or spring actuated catches or
latches within the heated chamber. The cam
movement of said hooks upon shifting movement
of the link member, a pair of opposed cam fol
lowers each operatively secured to said link, and
followers of each pair of followers being linked
together are operated cooperatively by the respec
a cam having a cam surface positioned for op
erative contact by said followers for shifting said
link in directions for swinging said hooks in uni
son into respective operative positions sequentially
during rotation of said arm.
tive cams to provide positive shifting of the re
4. Apparatus of the class described compris
spective links and hence positive movement into
ing a rotary shaft, a transfer arm mounted there
and retention of the hooks within their respec
on for rotation thereby and provided with load
tive positions during each cycle of rotation of the
carrying ends equally spaced from said shaft, a
transfer arm. The transfer mechanism, as will
be seen, actually transports the trays bodily 35 pair of hook members each pivotally secured to
the arm adjacent an end thereof and swingable
throughout their paths of arcuate movement
into operative load supporting positions with re
without use of cooperating stationary mecha
spect to the respective arm ends, cam followers
nism, such as curved tracks or the like, that by
friction, vary the resistance to the movement 40 operatively connected to said hook members for
effecting the swinging movement thereof, a cam
of the trays through their arcuare paths and
comprising a peripheral cam surface, and a link
thus produce irregularities in the action of the
operatively attached to said followers for retain
ing the same in contact with said cam surface
The cam controlled gripping means for the
during rotation of said arm for constraining said
trays hereinabove described may be employed at
hooks to move positively into and from the re
both ends of the conveyer, as shown, or at either
end. For example, the described mechanism can
spective operative positions thereof.
5. Apparatus of the class described comprising
a rotary shaft, a transfer arm mounted thereon
for rotation thereby and provided with load carry
may be desirable.
While a structure illustrative of the improve
ments has been shown and described, variations
in the details thereof may be utilized within the
spirit of the invention.
I claim:
50 ing ends equally spaced from said shaft, a pair
of hook members each pivotally secured to the
arm adjacent an end thereof and swingable into
operative load supporting positions with respect
to the respective arm ends, cam followers oper
55 atively connected to said hook members for ef
1. stabilizing apparatus comprising a rotary
fecting said swinging movement thereof, a cam,
and a link operatively attached to said followers
for constraining the same to follow the cam dur
ing rotation of said arm whereby the followers
coact each with the other for preventing pivotal
thereof, and means for retaining said tray por
movement of either hook beyond the respective
tions in the same relative positions with respect
load supporting position under influence of the
to said ends during the remaining portions of
load thereon.
said arcuate movements of the trays comprising
o'. Apparatus for supporting in horizontal rela
hook members pivotally secured to said arm and
adapted to engage said tray portions during said 65 tion arcuately movable trays pivotally secured to
transfer arm having ends upon which portions of
arcuately movable trays are adapted to be sup
ported during portions of the arcuate movement
opposed portions of a pair of endless conveyor
chains'arranged to pass over end sprockets at
and means comprising a cam for actuating said
the ends of the conveyor comprising a pair of
hook members into and from said engaging po
sitions in timed relation with respect to the move 70 rotary transfer members cooperatively positioned
adjacent each pair of sprockets and having ends
ment of the arm ends through the respective por
for supporting opposed portions of the trays dur
tions of said arcuate movements.
ing portions of said arcuate movement thereof, a
2. stabilizing apparatus comprising a rotary
pair of cradling members pivotally mounted on
transfer arm, a pair of hook members pivotally
secured to said arm and arranged to be swung 75 each of said transfer members for engaging said
ODDOSed portions of the trays for supporting the
remaining portions of said arcuate movements,
same during another portion of the arcuate move
ment thereof, means linking the cradling mem
bers of each pair together for movement in unison
about the respective pivotal mountings thereof,
a cam associated with each transfer member, and
caml followers supported by each pair of said
cradling members and revoluble by the latter
about the respective cam in contact with the same
whereby the cam eiîects movement of the re
spective cradling members alternately7 into and
from operative tray supporting positions.
'7. Conveyer mechanism comprising a pair of
spaced apart parallel endless chains having hori
trays for engaging portions of said tracks for
cooperation with said pivotal members in support
ing the traysupon said tracks as the trays move
therealong, and rotary transfer means adjacent
the sprockets at the ends of the chains for en
gaging portionsV of successive trays at points
spaced from the pivotal members thereof for re
taining the trays in horizontal relation as said
pivotal members -move about the respective
sprockets, said rotary transfer means comprising
rotary arms having receiving means for the en
gaged portions of the trays, means for retaining
saidrtray portions in said receiving means dur
ing portions of the arcuate movement of the trays
zontal runs, sprockets at the ends of the chains
from one run of the conveyer to the other, and
over which the same pass, tracks supporting the 15 cams for actuating said retaining means into and
horizontal runs of said chains, a plurality of
from operative positions with respect to the re
trays disposed between the chains and each be
spective receiving means.
ing provided with pivotal members securing the
trays to opposed portions of the chains, a pair of
oppositely extended rollers carried by each of said 20
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