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Патент USA US3050338

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Aug. 21, 1962
J. J. EAVES
3,050,328
SLING TRIPPING DEVICE
Filed Oct. 15, 1960
42
107 99
I09
INVENTOR.
JAMES
J. EAVES
ilniteni grates fpatcnt @ffice
1
3,650,328
Patented Aug. 21, 1962
2
FIG. 3 is a view similar to FIG. 2 of the device after
3,056,328
being tripped.
SLING TRIPPING DEVICE
FIG. 4 is a fragmentary view of a portion of the hook
means shown in FIG. 1, but with the hook means being
shown in 21 released position.
FIG. 5 is a fragmentary sectional view taken as on the
line V-—V of FIG. 2, with ‘a part being broken away for
purposes of illustration.
James J. Eaves, Louisville, Miss” assignor to
Taylor Machine Works, Louisville, Miss.
Filed Get. 13, 1960, Ser. No. 62,456
5 Claims. (Cl. 294—75)
This invention relates to a stripping or actuating de
vice for releasing the load from load carrying slings, and
FIG. 6 is a view on a reduced scale of the tripping
is particularly adapted for use with machines for han 1O device shown used in conjunction with wood handling
equipment.
dling pulp wood and other packaged wood products.
Other types of tripping mechaninsms have heretofore
FIG. 7 is a sectional view taken as on the line VII-VII
been contemplated, some hydraulic ‘and some mechan
of FIG. 3.
Referring now to the drawing in which the various
ical. A completely hydraulic ‘type has certain disad
vantages, among them being that the load is carried by
the hydraulic device which necessitates its being large
and expensive. Also, the full hydraulic type cannot re
parts are indicated by numerals, it is contemplated that
the tripping device v11 be used with any suitable machine
adapted to carry a load. For example, a typical machine
with which the device 11 is adapted to be used is shown
lease both slings at the exact same moment which causes
in FIG. 6 wherein it will be seen a wood handling ma:
undesirable conditions, such as the wood falling end
?rst. An example of a completely mechanical type is 20 chine 13 includes a self-propelled wheeled vehicle 15
having a mast 17 adjacent the forward part thereof upon
the tripping device disclosed in my co-pending applica
which is slidably mounted a carriage 19 adapted to be
tion, Serial No. 50,218, ?led August 17, 1960. In said
co-pending application the elongated trip ‘member was
moved upwardly and downwardly along mast 17 to raise
and lower the load A, which is illustrated in this ?gure
as pulp wood. Also, in the usual manner mast 17 is
adapted to be power actuated to tilt the mast forwardly
or reanvardly. Carriage 19 adjacent the upper end
thereof has a suitable supporting structure 21 for tripping
device 11, which structure includes a substantially hori
effectively shortened to release the load upon subsequent
upward movement of the tripping device. However, the
present invention is a combination mechanical and hy
draulic type of device which operates on a different prin
ciple than the device of my said co-pending application
and instead of shortening the trip member, the load slings
are effectively lengthened.
30 zontal platform 23.
A plate-like rocker arm 25 is rockably supported from
The present invention is directed towards overcoming
the disadvantages of previous types of tripping mecha
structure 21 adjacent one end thereof as at a substantially
horizontal pivot axis 27. The means for rockably sup
porting rocker arm 25 preferably includes a stationary
any heretofore known device.
09 Cl tubular hinge portion 29 attached to platform 23 as by
welding or the like, a pair of outer hinge portions 31
Thus, one of the objects of the present invention is to
?xedly attached adjacent the lower ends of the spaced
provide an improved device for releasing the load from
load carrying slings.
depending legs 33 of rocker ‘arm 25, and a hinge pin 35
extending through hinge portions 29, 31 and ?xedly held
A further object is to provide such a device that is
40 in place by means of set screws 37 extending through
adapted to release the load in mid-air, if so desired.
hinge portion 29 ‘and contacting the hinge pin.
A further object is to provide such a device that is
adapted to release the wood being loaded on a car or
A pair of slings 39, 41 are respectively pivotally cou
the like without lowering the carriage of the handling
pled adjacent one end to opposite sides of rocker arm 25
equipment low enough to give slack in the slings, thus
adjacent the distal end of the rocker arm as at coupling
saving much upward and downward travel of the carriage
axis 42, and the slings are respectively coupled adjacent
on the mast of the handling equipment.
the opposite ends thereof to supporting structure 21 adja
A further object is to provide such a device that is
cent the opposite end of the supporting structure’ from
adapted to cause the connecting means of the slings to
rocker arm 25.
respectively disconnect simultaneously, allowing the wood
Slings 39, 41 are substantially identical in construction
nisms and towards providing new advantages not present
in the device of my said co-pending application or in
to stay reasonably straight on the car.
50 and function, and the following description of sling 39
A further object is to provide such a device having
a unique arrangement of the mechanical and hydraulic
parts so that the hydraulic device does not take the weight
of the load, thereby permitting a smaller and less expen
55
sive hydraulic device.
A further object is generally to improve the design and
construction of tripping devices.
The means by which the foregoing and other objects
and its relationship to the other parts is deemed su?'icient:
Sling 39 comprises, in general, two parts: a sling mem
ber 43 and an opposing sling member 45, which are de
tachably connected together by connecting means, later
to be described, to complete the sling.
The actual part
of sling ‘39 that is coupled to rocker arm 25 as herein
above described is the upper end of sling member 43
which is coupled to the arm by suitable means and pref
erably comprises the following: a rod 47 is ?xedly at
ner of their accomplishment will be readily understood 60 tached along the upper edge of rocker arm 25 as by
from the following speci?cation upon reference to the
welding or the like and extends beyond the opposite
accompanying drawings, in which:
edges thereof. On one extension of rod 47 past the edge
of the present invention are accomplished and the man
FIG. 1 is a fragmentary front elevational view of the
of rocker arm 25 is rotatably received a sleeve 49 held
thereon against accidental removal by means of a washer
tripping device of the present invention with the device
being shown in a position for carrying a load, and with 65 51 and cotter pin 53'. A depending member 55 is ?x
edly attached to sleeve 49 and is provided with an aper
the jack cylinder being broken away for purposes of
illustration.
tore through which extends a shackle 57 that completes
FIG. 2 is a portion of the structure shown in FIG. 1
the coupling of sling member 43 to the rocker arm 25.
but with van inter-mediate position of parts of the device
Sling 41 is coupled in a similar manner on the opposite
being shown in dotted lines and with the parts being
side of rocker arm 25. The actual portion of sling 39
shown in solid lines just before the device is tripped.
that is coupled to supporting structure 21 as heretofore
3,050,328
4
3
extending therethrough. Base 115 is slidably mounted
described is the upper end of opposing sling member
45 which is preferably coupled to the supporting struc
on a rod 127 with the rod extending through opening
ture as by means of a plate 59 attached to the support
125 and with the rod being supported in horizontal spaced
relationship above platform 23 by means of sleeve-like
ing structure as by welding or the like and provided with
an aperture through which shackle 61 extends to complete
the coupling of the sling member 45 to the supporting
structure 21. Sling member 43 is preferably constructed
by a chain portion 63 forming the upper part thereof,
and a cable portion 65 forming the lower part thereof,
which is connected by suitable means to the lower end
of the chain portion. Likewise, sling member 45 com
stop members 129, 131 which are disposed on rod 127
adjacent opposite ends thereof. Stop members 129, 131
are ?xedly mounted on platform 23 and are respectively
provided with set screws 133, 135 which engage rod 127
and hold it ?xed in place.
For the purposes of describing the operation of device
11, the description is started with the device in the po
sition shown in FIGS. 1 and 6. It is assumed that the
prises an upper chain portion 67 and a lower cable por
slings 39, 41 are carrying a load A therein which is
tion 69. The lower end of cable portion 69 is provided
suspended in the air. If it is desired to release the load
with a loop 71 adapted to be engaged in the manner
shown in FIG. 1, by a hook pivotally mounted on cable 15 in mid-air the hereinafter described sequence of opera
portion 65 by a loop 75 provided in the end of the cable
portion extending through an aperture 77 provided in
hook 73.
tions is performed with supporting structure 21 held in
place. ‘Otherwise, if it is desired to lower the load onto
a car or the like supporting structure 21 is lowered,
'
An elongated trip member, indicated in general as at
79, is attached to hook 73 adjacent the opposite end of
the hook from the pivotal connection with loop 75. This
connection of the trip member 79 and the hook 73 is
preferably by means of a loop 81 provided in the end of
trip member 79 which extends through an aperture 83
in the hook. As in the case of the sling members, trip
member 79 is preferably formed with a lower cable por
tion 85 and an upper chain portion 87. The upper end
of trip member 79 is ?xedly anchored to supporting struc
as for example by lowering carriage 19 in the typical
wood handling machine 13 shown in FIG. 6. After the
load is lowered onto the car or the like then said fol
lowing hereinafter described sequence of operations is
performed:
Jack 99 is actuated to cause the jack to extend to a
?rst extended position shown in dotted lines in FIG. 2.
Durin‘y extension of jack 99 [from the retracted position
shown in FIG. 1 to said ?rst extended position rocker
arm 25 will remain stationary to hold the end of piston
rod 1115 stationary and the jack will cause base 115 to‘ .
ture 21 as at 91 by suitable means. A trip member 94
is also provided for sling 41 and is of the same con 30 move from a position adjacent stop member 129 to a
struction and operation as trip member 79. Trip member
position in abutment with stop member 131.
Continued
94 is attached to supporting structure 21 in the same
manner as trip member 79, but preferably on the oppo
site side of the supporting structure.
pivoted counterclockwise past the dead center position
extension of jack 99 will cause rocker arm 25 to be
shown in solid lines in FIG. 2 until the jack is in a second
A support 95, preferably in the form of a triangular 35 extended position slightly past the dead center position
plate, is ?xedly attached on one side of rocker arm 25
at which position it will be understood rocker arm 25
and extends perpendicular thereto. If desired a pair of
will be unsupported against pivoting, whereby the weight
of the load will cause downward pivot of the rocker
arm in a counterclockwise direction as viewed in FIG.
for added structural strength. The lower edge or heel
97 of plate 95 is adapted to contact the upper face of 40 2. This downward pivoting movement is limited by a
rubber bumper 137 which is ?xedly attached to support
supporting structure 21 to limit clockwise movement,
ing structure 21 and contacts the rocker arm to stop it
as viewed in FIG. 1, of rocker arm 25 and is adapted
in a position in which the coupling axis 42 is below the
to support the rocker arm in a ?rst position as best seen
levelit occupied when rocker arm 25 was in said ?rst
I in this ?gure. The relationship of heel 97 and rocker
position shown in FIG. 1; and, if desired, another rubber
arm 25 is such that an angle is formed therebetween
bumper 138 may be provided on the supporting structure
which is less than 90 degrees so that ‘the plate 95 sup
for cylinder 101. In other words, one of the upper ends
ports the rocker arm in said ?rst position which is tilted
of slings 39, 41 are respectively lowered relative to sup
to one side (the right side as viewed in FIG. 1) of an
porting structure 21 and thus the slings are respectively
upright dead center position of the rocker arm. This
lengthened relative to trip members 79, 94 so that a pull
position shown in FIG. 1 is the load carrying position
is exerted on the trip members to release the load. Both
and it will be understood that the weight of the load
these plates 95 may be provided in spaced relationship
normally urges heel 97 against supporting structure 21
and keeps rocker arm 25 in said ?rst position.
A double acting hydraulic jack 99 is provided for
pivoting rocker arm 25. Jack 99 comprises the usual
jack cylinder 101, piston 103 slidably mounted in the
cylinder, and the usual piston rod 105 connected to pis
ton 103 and extending outwardly through the end of jack
cylinder 101. Suitable and well-known ?uid supply
means, not shown, and suitable and well-known control
means, not shown, are provided for introducing ?uid to
of the trip members 79, 94 operate simultaneously and
in the same manner so that the following description of
the operation of trip member 79 will sui?ce:
When a pull is exerted on trip member 79, book 73
is rotated clockwise from the position shown in FIG. 1
about loop 75 to the position shown in FIG. 4 so that
the hook releases loop 71 and the sling members 43, 45
are disconnected. In the above described operation of
tripping device 11, it will be understood that after jack
99 has reached said second extended position that no
jack 99 through conduits 107, 109 for‘ actuating the hy
more power is needed from the jack but rather the jack 7
draulic jack in a well-known manner. Rod 105 is piv
otally coupled to rocker arm 25 by suitable means, as
by a lug 111 ?xedly attached to the rocker arm and by a
is pulled by rocker arm 25 and the weight of the load
causes the pivoting of the rocker arm. Also, it will be
understood that jack 99 is free to be pulled as above
pin 113 extending through aligned apertures in the lug
described since base 115 is ‘free to slide to the left on
and rod. The opposite end of jack 99 from rocker arm
rod 127 to a position adjacent stop member 129, as
shown in FIG. 3. The tripping device 11 is re-set in
7 25 is pivotally connected to a sliding base 115 of a mount
ing mechanism 117 for the jack.
This connection be—
position for the load simply by actuating jack 99 to re
tween jack 99 and base 115 is preferably by means of a 70 tract the jack so that rocker arm 25 is pulled up into the
pin 119 extending through aligned apertures in a stud
121' ?xedly attached to jack cylinder 101 and through
position shown in FIG. 1.
From the foregoing description it will be understood
that a very unique type of device is provided which offers
an upstanding bracket 123, which in turn is ?xedly at
many advantages over heretofore known types of trip
tached to base 115. Sliding base 115 is preferably block
like in construction and is provided with an opening 125 75 ping devices. In addition, it will ‘be understood that very
it
3,050,828
5
little power is needed by the jack 99 to push the rocker
arm 25 over the dead center position and thus, there is
free ends of said sling members to releasably hold the
load, an elongated trip member attached adjacent one end
no necessity for a large and expensive jack. Thus, it
thereof to said connecting means and adapted to be
can be seen that the jack at no time supports the load
pulled, said trip member being coupled adjacent the
and due to the unique mounting arrangement the Weight 5 opposite end thereof to said structure, said connecting
of the load exerts no force on the jack when it is free
means including means for disconnecting said connect
falling beyond the dead center position.
it is to be understood that it is not to be so limited since
ing means when said trip member is pulled, means sup
porting said rocker arm in a ?rst position tilted to one
side of an upright dead center position of said rocker
arm, mounting means carried by said structure, jack
changes and modi?cations may be made therein which
means coupled adjacent one end thereof to said rocker
are within the full intended scope of this invention as
arm and coupled adjacent the opposite end thereof to
said mounting means, said mounting means establishing
Although the invention has been described and illus
trated with respect to a preferred embodiment thereof,
hereinafter claimed.
I claim:
a movable amount for said jack means, means limiting
1. In a load carrying apparatus, a supporting struc 15 movement of said opposite end of said jack means in
opposite directions so that said jack means is adapted to
ture, a tripping device comprising a rocker arm rockably
be stopped in a ?rst stopped position and a second stopped
supported from said structure at a pivot axis, sling means
position, said jack means being movable between a
for carrying a load, said sling means including at least
retracted position and extended positions, with said rocker
a pair of sling members each having an upper end and
a free end, one of said sling members being coupled ad 20 arm in said ?rst position extension of said jack means
from said retracted position to a ?rst extended position
jacent its upper end to said structure and the other of
being e?ective to cause said opposite end of said jack
said sling members beng coupled adjacent its upper end
to said rocker arm at a coupling axis spaced from said
means to move from said ?rst stopped position to said
pivot axis, connectng means detachably connecting the
second stopped position, with said opposite end of said
free ends of said sling members to releasably hold the 25 jack means in said second stopped position further exten
sion of said jack means beyond said ?rst extended posi
load, an elongated trip member attached adjacent one
tion to a second extended position being effective to pivot
end thereof to said connecting means and adapted to
said rocker arm in one direction from said ?rst position
be pulled, said trip member being coupled adjacent the
of said rocker arm past said dead center position to an
opposite end thereof to said structure, said connecting
means including means for disconnecting said connecting 30 unsupported position so that the weight of the load car
ried by said sling means is adapted to cause downward
means when said trip member is pulled, means support
pivot of said rocker arm, said rocker arm being pivotable
ing said rocker arm in a ?rst position tilted to one side
far enough downwardly in said one direction to carry said
of an upright dead center position of said rocker arm,
coupling axis below the level it occupied when said rocker
mounting means carried by said structure; said mounting
means including a rod, a base slidably mounted on said 35 arm was in said ?rst position whereby said sling means is
eifectively lengthened relative to said trip member so that
rod, a ?rst stop member mounted on said rod adjacent
a pull is exerted thereon to disconnect the connecting
means and release the load, and pivot of said rocker arm
in said ‘one direction past said dead center position being
coupled adjacent one end thereof to said rocker arm
and coupled adjacent the opposite end thereof to said 40 effective to pull therewith said jack means as a unit with
out said jack means carrying ‘any of the load.
base, said jack means being moveable between a re
3. In a load carrying apparatus, a supporting struc
tracted position and extended positions, with said rocker
ture, a tripping device comprising a rocker arm rockably
arm in said ?rst position extension of said jack means
supported from said structure at a pivot axis, s-ling means
from said retracted position to a ?rst extended position
being effective to cause said base to slide from a ?rst 45 for carrying a load, said sling means including at least
a pair of sling members each having an upper end and a
position adjacent said ?rst stop to -a second position
one end thereof and a second stop member mounted on
said rod adjacent the opposite end thereof; jack means
free end, one of said sling members being coupled ad
adjacent said second stop, with said base in said second
jacent ‘its upper end to said structure and the other of
position further extension of said jack means beyond said
said sling members being coupled adjacent its upper end
?rst extended position to a second extended position be
ing effective to pivot said rocker arm in one direction 50 to said rocker arm at a coupling axis spaced from said
pivot axis, connecting means detachably connecting the
from said ?rst position of said rocker arm past said dead
free ends of said sling members to releasably hold the
center position to an unsupported position so that the
load, an elongated trip member attached adjacent one end
weight of the load carried by said sling means is adapted
thereof to said connecting means and adapted to be
to cause downward pivot of said rocker arm, said rocker
pulled, said trip member being coupled adjacent the
arm being pivotable far enough downwardly in said one
opposite end thereof to said structure, said connecting
direction to carry said coupling axis below the level it
means including means for disconnecting said connect
occupied when said rocker arm was in said ?rst position
ing means when said trip member is pulled, means sup~
whereby said sling means is effectively lengthened rela
porting said rocker arm in a ?rst position tilted to one
tive to said trip member so that a pull is exerted thereon
to disconnect the connecting means and release the load, 60 side of an upright dead center position of said rocker
arm, mounting means carried by said structure, jack
and pivot of said rocker arm in said one direction past
means coupled adjacent one end thereof to said rocker
said dead center position being effective to pull there
arm and coupled adjacent the opposite end thereof to
with said jack means as a unit and slide said base on
said mounting means, said jack means being extendable
said rod without said jack means carrying any of the
to pivot said rocker arm from said ?rst position past said
load.
dead center position to an unsupported position so that
2. In a load carrying apparatus, a supporting struc
the weight of the load carried by said sling means is
ture, a tripping device comprising a rocker arm rockably
adapted to cause downward pivot of said rocker arm, said
supported from said structure at a pivot axis, sling means
rocker arm being pivotable far enough downwardly in
for carrying a load, said sling means including at least
a pair of sling members each having an upper end and a 70 said one direction to carry said coupling axis below the
level it occupied when said rocker arm was in said ?rst
free end, one of said sling members being coupled ad
position whereby said sling means is effectively lengthened
jacent its upper end to said structure and the other of
said sling members being coupled adjacent its upper end
relative to said trip member so that a pull is exerted there
on to disconnect the connecting means and release the
pivot axis, connecting means detachably connecting the 75 load.
to said rocker arm at a coupling axis spaced from said
3,050,328
4. In a load ‘carrying apparatus, a supporting struc
ture, a tripping device comprising a rocker arm rockably
supported from said structure at a pivot axis, sling means
for carrying ‘a load, said sling means including at least
a pair of sling members each having an upper end and a
slings for carrying a load, each of said slings including at
least a pair of sling members each having an upper end
and a free end, one ‘of said sling members of each of said
slings being coupled adjacent its upper end to said struc
ture and the others of said sling members of said slings
free end, one of said sling members being coupled ad
being respectively coupled adjacent the opposite ends
jacent its upper end to said structure and the other of
thereof to said structure, a pair of connecting means
said sling members being coupled adjacent its upper end
to said rocker arm at a coupling aXis spaced from said
respectively detachably connecting the free ends of said
pairs of sling members to releasably hold the load, a pair
pivot axis, connecting means detachably connecting the 10 of elongated trip members respectively attached adjacent
free ends of said sling members to releasably hold the
load, an elongated trip member attached adjacent one end
thereof to said connecting means and adapted to be
one of the ends thereof to said pair of connecting means
and adapted to be pulled, said pair of trip members being
respectively coupled adjacent the opposite ends thereof
to said structure, said pair of connecting means respec
opposite end thereof to said, structure, said connecting 1,5 tively including means for disconnecting said connecting
pulled, said trip member being coupled adjacent the
means including means for disconnecting said connect
ing means When said trip member is pulled, means sup
means when said trip members are pulled, means sup
porting said rocker arm in a ?rst position tilted to one
side of an upright dead center position of said rocker
arm, said rocker arm being pivotable from said ?rst
side of an upright dead center position of said rocker
arm, mounting means carried by said structure, said 20 position past said dead center position to an unsupported
position, means connected to said rocker arm for pivoting
rocker arm being pivotable from said ?rst position past
said rocker arm from said ?rst position past said dead
said dead center position to an unsupported position,
center position to said unsupported position so that the
means connected to said rocker arm for pivoting said
weight of the load carried by said pair of slings is adapted
rocker arm from said ?rst position past said dead center
position to said unsupported position so that the weight 25 to cause downward pivot of said rocker arm to effectively
lengthen said pair of slings relative to said pair of tripping
of the load carried by said sling means is adapted to
members and simultaneously disconnect said pair of con
cause downward pivot of said rocker arm to effectively
necting means.
lengthen said sling means relative to said tripping member
and disconnect said connecting means.
References Cited in the ?le of this patent
5. In a load carrying apparatus, a supporting struc 30
UNITED STATES PATENTS
ture, ‘a tripping device comprising a rocker ‘arm rockably
supported from said structure at a pivot ‘axis, a pair of
617,267
Wiley ________________ __ Jan. 3, 1899
porting said rocker arm in a ?rst position tilted to one
r5e?w"e
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