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Dec. 31, 1946.
R. c. SWANEY
'
TRACTOR
CRANE
Filed Nov. 6, 1944
_
2,413,529
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4 Sheets-Sheet 1
Dec. 31,_ 1946.
R. C. SWAN EY
2,413,529
‘TRACTOR CRANE
_
Filed Nov. 6, 1944
4 Sheets-Sheet 2/
67/
’zmw
wt?
Dec. 31; 1946.
2,413,529
R. C. SWANEY -
TRACTOR CRANE
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4 Sheets-Sheet 3
Filed NW. 6, 1944
,,
,
Dec. 31, 1946;
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a
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'
R.. c. SWANEY
'
TRACTOR
CRANE
Filed Nov. 6, 1944
‘
2,413,529
~
4 Sheets-Sheet 4
Patented Dec. 31, '1946
2,413,529
‘ UNITED STATES PATENT OFFICE '
TRACTOR CRANE
Robert Casper. Swaney, Newton, Mass., assignor of
one-fourth to Laura B. Swaney, one-fourth to
Laura B. Swaney, as guardian of C. Barnett
Swaney, one-fourth to Laura B. Swaney, as
' guardian of Mary Jane Swaney, all of Newton,
Mass.
Application November 6, 1944, Serial No. 562,138
28 Claims.
(Cl. 212-—8)
' 2
The invention here involved is concerned with
crane equipment for tractors, and tractors pro
vided with cranes, for the purpose of picking up
represents the hood in which the vengine of the
tractor is contained, ll represents the driver’s
seat, I 2 represents a bracket (the supporting
frame of the power control unit) secured to the
heavy' loads, transporting them from place to
place, and depositing them at desired spots. One
rear end of the tractor frame and supporting
winch drums l3 and I4 by which the load line
object of the invention is to furnish a tractor
crane combination which is rugged, powerful and
and topping line are controlled, and I5 represents
a part of the driving mechanism for the drums‘.
. The bracket l2 also supports guide pulleys l6, l6
and I1, I‘! around which these lines are led.
easily operated. Another and particular object
is to provide a crane or derrick as a structural
combination capable of being applied and con
nected to existing tractors with a minimum of
reconstruction or structural modi?cation of the
tractor. Another object is to provide a crane
structure and a combination of such a structure
with a tractor which is of the utmost simplicity 15
but is capable of performing all of the duties
required of such a crane apparatus, in which the
forces and reactions are taken up and absorbed
by the crane structure. itself and which affords
?exibility permitting thetracks or tractive belts
of the machine to accommodate themselves to
uneven conditions of’ the ground.
‘
Further details of drum driving mechanism, the
brakes by which they are retarded when loads
are being lowered, and the control levers are not
here shown, as all these parts are standard equip
ment. It is su?icient to say that in this equip
ment of such control units only two hand levers
are needed- to a?ord complete control of the
drums in taking up and paying out the lines.
'20
The traction units are standard, each compris
ing two channel bars l8 having bearings I9 in
which is mounted the shaft 20 of a driving sprock
A,
et 2|, and bearings 22 in which the shaft of an
‘The invention consists in the combinations,
idle pulley 23 rotates._ The tractive belt 24 passes
constructions " and parts hereinafter described
around the sprocket and pulley. Supporting rolls
with reference‘ to one illustrative embodiment, 25 25 are journaled in bearings 26 secured to the
and in all equivalents thereof in which the same
under edges of the channel bars 18 and rest on
fundamental members are embodied.
'
sectional tracks 2'! carried by the tread pieces 28
In the -drawings~—
of which the tractive belt is composed. Shaft 20,
Fig. 1 is a side elevation of a tractor crane em-
bodying the invention;
'
driven by the» engine, rotates in the bearings l9,
30 and the entire tractor unit is capable of swing
Fig. 2 is a rear elevation of said tractor crane;
ing about that shaft in passing over uneven
Fig. 3 is a plan view of the‘same;
Fig. 4 is a detail sectional view of cable guiding
4 means forming part of the crane combination
taken on line 4-4 of Fig. 3;
ground, springs being interposed between forward
parts of the traction unit frame and the tractor
chassis to support the weight of this part of the
35 tractor body yieldingly., ‘Although this is all
Fig. 5 is a detail section taken on line 5-5 of
standard construction, av general description of
Fig. 4;
' /
it
is given here to make plain that the tractor
Fig. 6 is a cross section of part of one of the
units may swing up and down independently of
traction units of the ' machine taken on line
one another about the power shaft 20 when pass
6-6 of Fig. 1;
40
Fig. 7 is a detail sectional view of one of the
support brackets vfor the parts of the crane, being
a modi?cation of the corresponding bracket
shown in Fig. 6;
ing over bumps and obstacles on the ground.
The crane equipment comprises a mast 29, a,
boom 30 and a part 3| which I calla counter
arm and which serves as a brace or tie member
Fig. 8 is a view similar to Fig. 2 showing an 45 for the head of the mast.v The mast isa strong
and rigid structure made of steel channel bars
alternative design of mast and boom.
and plates secured together by welding or other
Like reference characters designate the same
suitable means to form a beam 32 in its upper
parts wherever they occur in all the figures.
portion and three feet 33, 34 and 35, respectively,
The tractor shown in these drawings is a stand
which lie in a plane at an angle to the beam 32.
ard model of one of the well known commercial 60 The feet are provided with eyes at their extrem
tractors equipped with hoisting means of the type,
commonly known as a two-drum power control
unit, and control means by which the drums are
ities, in axial alinement, which are coupled by pins
36, 31and 38 with lugs 39; 40 and 4|, respectively,
on a support bracket 42, which is secured to the
driven for hoisting loads and their rotation is
outer
channel bar l8 of one of the traction units.
retarded when the loads are lowered. Here In 55
There are two middle lugs 40 on the support
2,413,529
it
bracket between which the eye of the middle
foot of the mast is received. Other lugs 43 and
63d are provided on the support bracket. adjacent
to each end thereof and outside of the lugs 39
and M. These outer lugs embrace the terminal
eyes of the boom 3@ and assist in supporting the
pivot pins 36 and 38 by which the outer feet of
the mast and the terminal eyes of the boom are
coupled to the support bracket.
4
nected at one end to the lug 50 by a pivot 53,
and it carries at its opposite end a cage 54 in
which pulley sheaves 55 are mounted, such cage
and sheaves constituting a pulley block. Lug 5i
contains a number of holes into any of which a
hook or bail may be placed for supporting the
upper block 56 of the load fall, or otherwise sup
porting a load. Lugs or webs 57 are secured to
- the upper end of the mast head in parallel
planes, supporting a pivot 58 on which sheaves
The beam portion 32 of the mast extends on
an upward slant across substantially the full
59 are mounted, and embracing the sheaves and
width of the tractor and its head carries a lug
serving as separators between adjacent sheaves.
155 to which the upper end of the counter arm
Said lugs and sheaves constitute a second pulley
3! is connected by a pivot pin 136. The lower end
block.
'
of the counter arm is coupled to the middle lugs 15
A load line 60, anchored to one of the blocks
of a support bracket ill which is a duplicate of
of the load fall passes around sheaves in the
the bracket 42 and is secured to the outer channel
upper and lower blocks 56 and BI and from the
bar of the other traction unit. The coupling in
upper block to and under a guide sheave 62
cludes a link Q8 connected at one end by a pivot
mounted on the mast, thence around a guide
139 to the counter arm 38 and at its other end to
pulley 63 (which is coupled with the mast in a
the bracket lugs by a pivot which is substantially
manner later described), through a fair lead
at right angies to the pivot t6. These pivots are
tube 64 rearwardly, thence over a guide pulley
close together and make in e?ect a universal
65 on a post 66 which rises from the bracket 12
joint, permitting a relative angular movement in
of the hoisting apparatus, and thence under one
all directions between the counter arm and the
of the pulleys I1 and over one of the pulleys Hi
traction unit.
to the hoisting drum 13. The guide pulley 62
An important advantage results from the ar~
for this line is located on the mast as near as
rangement of the mast and the disposition of its
feasible to the boom in order that the stress
-' head and point of connection with the counter
applied to the line 60 will have the least possible
arm in substantially or nearly vertical alinement 30 .tendency to elevate the boom.
with the location at which the counter arm is
The boom is swung around its pivot axis in
connected with the traction unit. This is the
handling loads by means of a topping line 61
elimination of lateral stress by the parts of the.
which is ‘anchored to the mast at 68, passes
crane on the traction units. rIv‘he truth of this
around the pulleys 55 and 59 in two or more
statement will be apparent from the following
stretches, thence around a guide pulley 69 on the
analysis.v When the boom is in an inclined or
mast, through the fair lead tube 64, over a guide
,horizontal position, the ‘weight of the boom and
beside the pulley 65, and to the drum H around
any suspended load, and the pull of the topping
line, create a resultant force which is applied to
the traction unit along the length of the boom.
The horizontal component of this force is exerted
inwardly toward the center ‘line of the tractor.
the other set of pulleys I‘! and IS in a course
substantially parallel to that of the load line.
By making the lugs 50 and 5| of a single in
' tegral piece of metal passing through the end
of the boom and secured to it, the strongest pos
sible structure for the raising of loads is fur
compressive stress in the mast which exerts force .
nished. It transmits stress directly from the load
on the traction unit with a horizontal component 45 fall to the boom topping rig to the limit of its
equal and opposite to that applied by the boom.
tensile strength, and is not liable to failure
through a defective weld.
Thus the only unbalanced forceapplied to the
The post 66 is connected to bracket [2 by a
traction unit acts vertically downward, when the
pivot "HI- so that it can swing in a' substantially
machine is on level ground. The turning moment
of the mast and crane assemblage due to the load 50 vertical plane forward and aft. It is connected
with the fair lead tube.“ by a knuckle consist
is balanced by the tensile stress in the counter
ing of a yoke ‘H on the fair lead tube embrac
arm 3i, which applies force vertically upward
ing a pulley guide 12 on the post and connected
to the opposite traction unit. For the foregoing
- But the tension in the topping line is balanced by
with the latter by the same pivot 13 on which the
reasons, I claim as an important factor of the
invention the disposition of the mast head and 55 guide pulley 65 and the pulley beside it, over
counter arm substantially vertically over the
which the topping line passes, are mounted. Yoke
lower point of connection of the counter arm.
H has a tubular stem 14 ?tted rotatably in the
fair lead tube and the pulley guide 12 has a
However, the invention includes other possible
stem ‘I5 ?tted rotatably in the upper end of post
arrangements which sacri?ce this advantage in
greater or less measure, for such other arrange 60 66. These parts provide a universal coupling per
ments are operative even though less satisfactory.
mitting relative angular movement between the
The boom is an A frame made of_ steel H bars,
the upper ends of which are secured together, by , tially at right angles‘ to each other; and the for-l
ward and of the fair lead tube is connected to
welding or otherwise, and the lower or foot ends
are spread apart and provided with eyes which 65 the mast by a coupling 16 constructed to permit
angular movement about an' axis extending
receive the pivot pins 36 and 38 respectively in
lengthwise of the mast and another axis substan
the spaces between the pairs of end lugs 43, 44.
tially perpendicular‘ both to the mast and to the
A plate is set into notches in the adjoining outer
fair lead tube. The pulleys 63 and 69 are sup
ends of the H bars and welded in place. The
ends of this plate project and provide a lug 50 70 ported by the fair lead tube at the end there
of next to the mast. and are located at respec
at one side of the boom and a lug 5! at the
tively opposite sides of the axis of the tube.
other side. Cap plates 50! are welded on the
They are here shown as supported by pivots 1‘!
Qouter ends of these bars, covering the channels
between their ?anges.
(one of which is tubular to permit passage of
A bridle 52, which is a rigid bar or tube, is con 75 the line through it, as shown by Fig. 5) in a. frame
5
2,413,529
secured to the tube, but this detail is not an
essential feature. They could be mounted in a
rigid frame, or otherwise mounted in ?xed posi
tion, inasmuch as the leads-for both lines are
lengthwise of the mast. However, the swivel ar
rangement permits either line to be led at vari
ous inclinations to the length of the mast if de
.as is indicated by broken lines in Fig. 2. Then
the mast, boom and bridle form a rigid triangle
by which the boom is prevented from swinging
as the tractor travels over uneven ground or at
uneven speed, in transporting a load from one
place to another. Preferably the bridle and its
cage are of such length that the boom is then
sired. With the use of the guide sheave 52, or
vertical when the tractor is on level ground; but an equivalent, the two lines 60 and 61 lead from
this is not essential. The rigid triangle or truss
the pulleys 63 and 69 in directions opposite to
feature is important, however, and is obtainable
one another and substantially in alinement.
with a bridle either longer or shorter than that
Thus, when they jointly support a load, the
here shown. '
stresses in them due to the load are balanced.
By virtue of the articulations through which
The members 64 and 66 act as struts which ab
the counter arm is coupled with the crane mast
sorb the strain of the cables and relieve the frame 15 and the traction unit of the tractor, and those
of the tractor and traction units from racking
of the fair lead tube 64 and post 66, the full’ ?ex
stresses. If the cables were led directly from the
ibility of the tractor .is preserved while the crane
mast\to the drums and no compression member
itself is rigid. Thus either traction unit may be
were provided to absorb their pull they would ap
raised above or lowered below the other in pass
ply a powerful side stress on the mast and a lift 20 ing over bumps and irregularities of the ground
ing stress on the rear end of the tractor, which
without applying racking stress to either the
would seriously hamper. the free movement of
tractor frame orgto the crane. If, for instance,
the traction unit to which the foot of the mast is
the traction unit‘to which the feet of the mast
connected. But by providing rigid members be
' tween the take up drums and the points at which
the "cables leave the mast, the racking stresses
due to the cables are absorbed and neutralized;
and the articulation between the rigid members
- and boom are pivoted swings upward or down
ward about its pivotal connection with the frame,
the crane is tilted forward or aft, but the cou
plings at top and bottom of the counter arm 3|
permit such movements without imparting ap
whereby they cause the cables to travel in an
‘ preciable bending stresses to the counter arm or
angular path enables these members to maintain 30 to the other parts of the structure, and the fair
a substantially constant length of cable between
lead tube 64 and post 66. accommodate themselves
the drums and mast however the latter'may be
to all such movements and retain the various
inclined forward or aft due to movement of its
guide pulleys at unvarying distances from each
supporting traction unit in passing over rough
other at all times in position to absorb the stresses
ground and obstacles.
1
35 of the cables, as described, and in correct planes
A spring 88 is interposed between the boom and
to guide the hoisting lines properly. The forces
bridle to bear on abutments thereon near the
and reactions incident to raising and lowering
hinge connection 53. This spring supports the
loads except those incident to the articulated
weight of the bridle and pulley block 544-55 and '
holds them away from the boom at a nearly con 40
stant angle with the boom when the topping
line is slack, so that the‘block will not be set
to bobbing up and down when thetension in the
struts are borne by the crane structure itself
and supported by the traction units at a low
level near the ground. They are not transmitted
to the body of the tractor.
It is not essential that the boom of the crane
be pivoted directly to the frame of ‘the traction .
topping line is suddenly changed due to condi
tions which frequently occur in handling loads
and when the crane is moving. Other springs
unit, for it may be mounted directly on the mast
89, of helical form, ‘are mounted on the sides of
location. Fig. 8 shows a modi?cation in which a
and connected thereto by a. pivot at any desired
the mast at the angle between the upright foot
boom 30a is connected by pivots N10 to the mast
portion and the inclined beam portion thereof.
on an axis near the vertex of the angle between
They bear against brackets 90 on the mast and 50 the upright and inclined portions of the mast.
‘are ‘supported by bars which project from the
This boom, like the boom 30, is an A frame and
respective brackets into the coils of the respective
has legs which straddle the mast and are con
springs. They are located in the paths of move
nected to the latter by two alined pivots. Springs
ment of the two arms of the boom and are en89a analogous to the springs 89 are supported by
gaged and compressed by the latter when the 65 brackets 90a, secured to the side members of
boom is in and near the upright position shown
the mast in position to be engaged and com
by broken lines in Fig. 2. Their main purpose
pressed by the legs of the boom when the lat
and function is to displace the boom from an
ter is substantially vertical, and to thrust the
upright position when the topping line is slack
boom away when the topping line is slackened.
ened to one that is so far inclined that "grav
ity becomes effective to lower it further. The
boom can be placed in a, position where its cen
ter of gravity is vertically above the pivot'axis,
or even inboard from thefvertical if the tractor
rests on ground which raises the side to which
the boom is pivoted higher than the other side,
In all other respects this crane combination is
identical with that previously described and is
mounted on the tractor and controlled by a two
drum power control unit and cables in the same
way. Representation of the power control unit
in vFig. 2 has been omittedvfrom Fig. 8 for sim-,
plicity. In both form'syof crane the‘ boom is sup-. ~
' and infsuch cases gravity alone is insufficient to
ported by one of the traction units exclusively
lower the boom and draw out the topping line
and is arranged to swing about an axis extending
when the line"is slackened. The springs af
lengthwise of the unit.
.
ford means for insuring that the boom will be 70
The ways in which the two lines 60 and 61 can
lowered in such circumstances.
be used conjointly to raise and lower loads will
The cage 54 on the bridle includes a trans
verse member or wall 9! (Fig. 3),‘which abuts
be obvious. It should be noted also that in some
situations either line may be used alone for that
against the pulley supporting lugs 51 of the mast . purpose. Thus, the boom may be held at a de
head when the pulleys are brought block to block. 75 ‘sired inclination, without change of inclination,
2,413,529
' 8
while loads are lifted and lowered by operation
What I claim and desire to secure by Letters
of the load line 60; the topping line then serv
ing as a guy or stay. Or, the boom may be tilted
about its pivot by taking up and paying out the
Patent is:
_
1. A tractor crane comprising the combination
with a tractor having traction units connected
topping line 61 to raise and lower loads which are
with the tractor to swing about a horizontal axis,
of a mast and boom supported by a frame mem
ber of one of the traction units exclusively, with
suspended from the boom by the load fall here
shown, or other means, without using the load
line otherwise than as a suspender.
the boom pivoted to swing laterally with respect
A very important feature of the invention is
to the tractor, a connector between the head of
concerned with the means and the ease by which 10 the mast and the frame of the traction unit at
this crane can be mounted on commercial trac- '
tors. Referring to Fig. 6, it will be seen that the
support bracket 42 is provided on its inner side
with two parallel keysways 9'2 and 93 spaced and
tractor, and cables leading from said hoisting
means to the mast and boom for raising and low
dimensioned to receive the upper and lower
?anges 0f the outer channel bar l8 of one trac
tion unit, and that a bolt 94 passes through a
hole in the support bracket into a tapped hole
in an anchor bar 95, which is welded to the web
of the channel bar between its ?anges. There
may be two such bolts located at the ends of
the support bracket, as shown in Fig, 1, or any
other number as desired. The ?anges of the
channel bar and the shoulders constituted by the
upper walls of the keyways 92 and 93 support
the weight of the crane, and the bolts 94 mere
ly tie the bracket to the channel bar; the holes
in the brackets through which the bolts pass
being large enough to relieve the bolts of any
' shearing or bending stress.
The bracket 41 is secured to the other trac
tion unit in the same way, and applies both the
the opposite side of the tractor from the before
mentioned unit, hoisting means mounted on the
ering loads and for swinging the boom.
,
v2. A tractor crane comprising the combination
with a tractor, of a mast mounted on one of the '
traction units of the tractor exclusively and rising
therefrom and having an upper portion extend
ing across the tractor to a point substantially
vertically over the outer side of the other trac
tion unit, a rigid connector in articulatedcom'
nection at its lower end with said other traction
unit exclusively and at its upper end with the
mast at a point substantially vertically over its
connection with the traction unit, a boom sup- .
ported exclusively by the ?rst named traction
unit with capability for swinging movement be
tween different angles with the vertical, hoist
30 ing means mounted on the tractor, and cables
upward and downward stresses, transmitted
through the counter arm 3|, to the correspond‘
ing channel bar through its engagement with the
?anges of the channel bar.
No change other than applying the anchor
bars to the ‘channel bars of the traction units is
. leading from said hoisting means to the mast and
boom for raising and lowering loads and for
swinging the boom.
3. A tractor crane comprising the combination
with a tractor having traction units at its oppo
site sides, of a mast and boom supported ex
clusively by a frame member of one of the trac
tion units with the boom pivoted to swing between
required to mount the crane on any commercial
different angles with the vertical, a connector be
tractor which has traction unit frames of this 40 tween the head of the mast and the frame of
design; and such attachments can be made in
the other traction unit, hoisting means mounted
any shop t ere fusion welding equipment is
on the tractor, cables leading from said hoist
available.
"“
ing means to the mast and boom for raising and
Fig. 7 illustrates a variation in design of sup~
port bracket applicable to tractors of which the 45 lowering loads and for swinging the boom, and
guide means for the cables between the hoist
outer longitudinal frame members are of box
ing means and the mast arranged to lead the
form in section. In this design of tractor the
cables in angular paths and to balance the stresses
beam lBa, corresponding to- the channel bar l8
in the cables.
,
of Fig. 6, carries a plate 96 welded to its flanges
If. The combination with a tractor having trac
and overlying the space between them. The
tion units at opposite sides, of support brackets
bracket 91, which corresponds to the brackets
connected respectively to outer frame members of
42 and 41, has a lip or shoulder 98 on the face
the respective traction units, a mast supported
‘opposite to that from which the lugs project,
entirely by the bracket of one of said units, a boom
which is placed so as to overlap the upper edge
of the plate 96, and the bracket is made fast by 5; connected to swing about an axis extending
lengthwise of the traction unit, a rigid counter
a suitable number of bolts 99 threaded into tapped
arm connected to the bracket of the other of
holes in the plate 96. All that is needed to apply
said units by pivot means having two axes trans- .
the crane to tractors of the last described type
verse to one another, and\ pivotally connected to
is to drill and tap a 'su?icient number of holes
in the plates 96 of the two traction units to re 60 the mast, a load supporting means suspended
from the boom, hoisting mechanism mounted
ceive the connecting bolts.
‘
on the tractor body, and a topping line running
Inasmuch as the brackets of both sides of. th
from said hoisting mechanism and so connected
tractor are alike, the crane can be mounted for
with the boom and mast as to control the rais
operation at either the right or left side of the
. tractor, and can be easily shifted over from one 65
side to the other, as occasion may demand. When
the crane must be used in situations which pre
ing and lowering of the boom about its pivotal
connection with the ?rst named bracket.
5. A tractor crane comprising the combination
with a tractor having traction units at opposite
of shifting the crane from one side to the other
sides, of a mast supported entirely on one of said
70 traction units, a member supported entirely on
Wherever in this speci?cation and in the fol
the other traction unit and connected to the
lowing claims the words “vertical” and “hori
mast for bracing it, a boom pivoted to one of the
zontal” are used, they are to be understood as
traction units to swing about an axis extending
having reference to the positions of the several
longitudinally of the unit, means for applying
parts when the tractor is at rest on level ground. 75 force between‘ the mast and boom for swinging
vent it from being turned around. this capability
2,413,529
.10
- ing mechanism and boom varranged to support a
the boom, and means on the boom whereby a
load, a boom topping line running between the
boom, the mast and the hoisting mechanism for
‘
6. A tractor crane comprising the combination
swinging the boom, and articulated struts hav
with a tractor having traction units at opposite
ing cable-guiding means between the hoisting
sides, of a mast formed with a bend between its
‘mechanism and mast arranged to absorb the
head and foot ends, its foot end being mounted
stresses of said lines and to accommodate the
on one of the traction units so that the part of
movements of the crane structure relative to the
the mast above the bend overlies the tractor, a
tractor body due to independent movements of
member connected to the other traction unit and
to the mast at a point substantially vertically 10 the traction units in passing over uneven ground.
10. In a tractor crane, the combination with 'a
' above the latter traction unit for bracing the
tractor having traction units at opposite sides and
mast, a boom supported from the same traction,
hoisting mechanism, of a'mast mounted on one
unit to which the foot end of the mast is con
of the traction units, a member in articulated con
,nected, pivotally mounted to swing in a plane
transverse to the length of the tractor, a rigid 15 nection with the other traction unit and with the
mast for bracing the latter, a boom pivoted to‘ the
bridle connected at one end to the outer part of
?rst named traction unit to swing about an axis
the boom and having a pulley block at its other
extending lengthwise of the traction unit, a load
end, a pulley block-mounted rigidly on the head
line running between the hoisting mechanism
of the mast, a topping-line passing around sheaves
of said pulley blocks for swinging the boom, and 20 and boom arranged to support a load, a boom
topping line running between the boom, the mast.
a load fall suspended from the boom; the mast,
and the hoisting mechanism for swinging the
boom and bridle being arranged to constitute a
boom, and articulated guide means between the
rigid triangle when the blocks'on the bridle and
mast are brought together.
hoisting mechanism and mast arranged to absorb
7. A tractor crane comprising the combination 25 the stresses in the lines and to accommodate
the movements of the crane structure relative to
with a tractor having traction units at opposite
the tractor body due to independent movements
sides, of a mast formed with a bend between its
of the traction units in passing over uneven
head and foot ends, its foot end'being mounted
ground, said guide means including pulleys
on one of the traction units exclusively so that
the‘ part of the mast above the bend overlies 30 mounted on the mast around which the load line
and topping line, respectively, pass, a rigid fair
the tractor, a member connected to the head of
lead member ?exibly coupled tovthe mast‘ and
the mast and to the other traction unit exclu
extending rearwardly therefrom, a post pivoted
to the structure adjacent to the hoisting mecha
sively at points in substantially vertical alinement
for bracing the mast, a boom supported by the
same traction unit to which the foot end of the
mast is connected, in pivotal relation to the mast
so as to swing in a' plane transverse to the length
of the tractor, means including a topping line
interconnected with the mast and boom at points‘
distant from said pivotal support, for swinging
nism extending upwardly from its pivots and piv
oted to the fair lead member by a knuckle joint,
and guide sheaves for the respective lines mount
ed at said ‘knuckle joint.
the boom up and down about its pivotal support,
and a spring carried by the mast in position to
be engaged and.» compressed by the boom when
,
anism, of a mast mounted on one of the traction
units exclusively, a boom pivoted to the same
traction unit to swing about an axis extending
lengthwise of the unit, a mast bracing member
connected to the other traction unit and to the
mast and to, no other part of the tractor, and
the latter is raised, whereby to impart force tend
ing to lower the boom.
8. A tractor crane comprising the combination
with a tractor having traction units at opposite
sides, of a mast formed with a bend between‘ its
head and foot ends, its foot end being mounted
on one of the traction units exclusively so that
the part of the mast above the bend overlies the
tractor, a member connected to the head of the
mast and to the other traction unit exclusively for ,
bracing the mast, a boom pivoted to the same
traction unit to which the foot end of the mast is
connected, arranged to swing in a plane trans
verse to the length of the tractor, between a
substantially upright position and a lowered posi
tion, hoisting means coupled with the boom and‘
.
11. The combination with a tractor having
40 traction units at opposite sides and hoisting mech
, cables running from the hoisting mechanism to
‘the mast and boom for raising and lowering the
latter and to a load support suspended from the
‘ boom, respectively.
12. The combination with a tractor having trac
tion units at opposite sides and hoisting mecha
nism, of a mast mounted on one 01' the traction
units exclusively, a member'in articulated con
nection with the other traction unit and with
, the mast and connected to no other part of the
" tractor for bracing the latter, a boom pivoted to
the mast to swing to positions making di?erent
angles with the vertical, a load line running be
mast controlling the swinging movement of=the 60 tween the hoisting mechanism and boom arranged
boom, and a spring mounted on the mast in posi
tion to be engaged by the boom when the latter
approaches its- upright position for displacing‘
the boom from the upright position when the
force of the hoisting means is relaxed. '
9. In a tractor crane, the combination with a
tractor having traction units at opposite sides and
hoisting mechanism, of a mast mounted; on one »
of the traction units, a member in articulated
connection with the other traction unit and with
the mast for bracing the latter, a boom 111.5111):
lported relation to the ?rst named traction unit
'
and in pivotal relation to the mast to swing
about an axis extending lengthwise of the trac
tion unit, a load line running between the hoist 75
to support a. load, and a topping line running be
‘ tween the boom, the mast, and the hoisting mech
anism for swinging the boom.
-
13. A tractor crane comprising the combina
tion with a tractor having traction units at oppo
site sides, of a mast mounted at its foot end on
one of the traction units-exclusively and formed
with a bend so disposed that'its upper part ex
tends transversely over the tractor, a member
connected 'to the head of the mast and to the
opposite traction unit exclusively at points in
substantially vertical alinement for bracing the
mast, a boom supported by the same traction unit
on which the foot end of the mast is mounted,
in pivotal relation to the mast so as to swing in
2,413,529
11
12
a plane transverse to the length of the tractor,
and means between the mast and boom for swing
ing the boom up and down about its pivotal sup
port.
-
>
~‘
14. A tractor crane comprising the combina
tion with a tractor having traction units at 0p
posite sides, of a mast mounted at its foot end
-
means and the mast along the length of the strut
means, said cables being arranged to control
raising and lowering of the boom and of a load
suspended from the boom.
18. A crane structure comprising a mast, a
boom pivotally mounted for swinging movement
relatively to the mast, a rigid bridle pivoted to
the boom, a topping line passing between the mast
on one of - the traction units exclusively and
head and bridle, and a spring interposed be
formed with a. bend so disposed that its upper
part extends transversely over the tractor, a mem 10 tween the boom and bridle for supporting the
weight of the bridle when the topping line is‘
her connected to the head of the mast and to the ~
opposite traction unit exclusively at points in sub
slack.
19; A_ crane structure- comprising a mast, a
stantially vertical alinement for bracing the
boom pivotally mounted for swinging movement
mast, a boom supported by the same traction unit
on which the foot end of the mast is mounted, in 15 toward and away from the mast, a bridle con
nected to the boom, a pulley block connected
with the bridle at a point distant from the boom,
plane transverse to the length of the tractor,
pulleys on the mast, a topping line passing around
means between the mast and boom for swinging
said
pulleys and the pulleys of said block, and a
the boom up and down about its pivotal support.
and resilient stop means carried by the mast in 20 yieldable resistor disposed to react with the bridle
and block to resist bobbing of the block when
position to be engaged and put under strain by
the tension of the topping line is altered.
the boom when the latter is raised, whereby to
20. A tractor crane comprising the combination
impart force tending to lower the boom.
with a tractor having traction units at opposite
15. A tractor crane comprising the combination
sides, of a mast and boom supported exclusively
with a tractor having traction units at opposite '
by one of said units, a connector between the
sides, of a mast mounted at its foot end on one
head of the mast and the traction unit at the
of the traction units exclusively and formed with '
other side of the tractor, a stay connected be
' a bend so disposed that its upper part extends
tween the mast and boom holding the boom in
transversely over the tractor, a member connected
to the head of the mast and to the opposite trac 30 clined, hoisting means on the tractor, and a load
pivotal relation to the mast so as to swing in a
tion unit exclusively at points in substantially
vertical alinement for bracing the mast, a boom
supported by the same traction unit on which
the foot end of the mast is mounted, in pivotal
relation to the mast so as toswing in a plane
transverse to the length of the tractor, hoisting
means for raising the boom about its pivotal sup
port, and means for causing displacement of the
boom outward from an upright position when
» line running from said hoisting means to guided '
engagement with the mast and boom for sup
porting loads and operable by the hoisting means
to raise and lower such loads.
21. A tractor crane comprising the combina
tion with a tractor, of a crane including a mast
and boom supported entirely by the traction
units of the tractor, the boom being pivotally
mounted in cooperative relation to the mast at a
point lower than the mast head so as to swing to
ward and away from the mast head, a power
control unit mounted on the tractor having cable
tion with a tractor having traction units at op
take up means, cables running between the power
posite sides, of a mast mounted at its foot end on
control unit, the mast and the boom, a strut piv
one of the traction units exclusively and formed
otally connected at one end to the mast, a sec
with a bend so disposed that its upper part ex—
ond strut pivotally mounted near said take up
tends transversely over the tractor, a member con
means, the struts being connected pivotally to 1
nected to the head of the mast and to the oppo
each other at one'side of the straight line from
site traction unit exclusively at points in substan
said unit to the connection of the ?rst strut with
tially vertical alinement for ‘bracing the mast, a
boom supported by the same traction unit‘on 50 the mast, and cable guiding means arranged to
lead the cables along the struts.
which the foot end of the mast is mounted, in
the force of the hoisting means is relaxed.
16. A tractor crane comprising the combina
pivotal relation to the mast so as to swing in a
plane transverse to the length of the tractor,‘
hoisting means mounted on the tractor at a loca
22. A crane structure comprising a mast, a
boom pivoted to swing toward and away from
the mast, hoisting means at one side of the mast,
tion displaced in the length dimension of the
tractor from said transverse plane, cables run
hoisting means to the mast at a location between
ning between the hoisting means and the mast
the head and foot ends thereof, and means on the
disposed for controlling the boom and a load
most disposed to guide said lines in relatively
suspended therefrom, and rigid strut means be
tween the hoisting means and mast arranged to 60 opposite directions from the before named loca
tion; the topping line being operatively con
absorb and neutralize stresses due to tension in
nected with the head portions of the mast and
the cables. ’ boom for controlling the swinging movements of
17. A tractor crane comprising the combination
the latter, and‘ the boom having guide means
with a tractor having traction units at opposite
sides and a hoisting mechanism at one end, of a 65 over which the load line passes for supporting
.
mast supported at its foot end exclusively by one
23. A crane structure comprising a mast, a
of the traction units, a bracing member supported
boom pivoted to swing toward and away from the
exclusively by the other traction unit and con
nected with the head of the mast for bracing the
latter, a boom supported by the same traction 70 mast, cable guiding means connected with the
mast at a location between the head thereof and
unit which supports the mast, in pivotal relation
the boom, a cable guide on the mast nearer, to the
to the mast so as to swing in a plane transverse '
boom than said cable guiding means, a pulley
to the length of the tractor, rigid strut means
on the head portion of the mast, hoisting means
disposed between the hoisting means and the
mast, and cables running between the hoisting
at one side or the mast, and two cables leading
2,418,529
13
14
clusively by one of the traction units of a tread
from said hoisting means to said cable guiding
means; one of said cables leading thence to and
around said mast head pulley to operative con
tractor with the boom pivoted to swing laterally
with respect; to the tractor, an upright member
having its upper end connected to the head end
portion of said mast and its lower end adapted to
nection with the boom for controlling the swing
ing movement of the boom, and the other cable
passing in the relatively opposite direction to
be mounted on a tractionvunit at the opposite
side of the tractor, hoisting means adapted to be
and around said cable guide and over guide means
mounted on the tractor, and operative tension
on the boom for supporting a load.
means leading from said hoisting means to the
24. A crane structure comprising a mast, a
boom pivoted to swing toward and away from 10 mast and boom for raising and lowering loads
andior swinging the boom.
27. A crane comprising a mast having feet at
the mast, hoisting means at one side of the mast
its lower end spaced apart from one another and
and of the plane in which the boom is adapted
adapted to be mounted on one of the traction
units
of a tread tractor with its feet in a line ex
15
from said hoisting means to the mast at a loca
tending lengthwise of such unit and having a
tion between the head and foot ends thereof,
head end, a counter arm or tie member con
strut means between the hoisting means and
nected at one end to the head end of said mast
mast arranged to absorb and neutralize stresses
and extending downwardly therefrom, adapted to
due to tension in said lines, and means on the
mast disposed to guide said lines in relatively 20 be connected at its lower end with a traction unit
at the opposite side of the tractor, said counter
opposite directions from the before named loca
arm being so related to the mast as to occupy a
tion; the topping line being operatively connected
with the head portions of the mast and boom for
controlling the swinging movements of the lat
subsantially vertical position when the foot ends
_' of the mast and counter arm are mounted on
' ter, and the load line passing over guide mean-s on 25 traction units at opposite sides of a tractor, a
the boom for supporting a load.
25. A crane comprising a mast having a foot
end adapted for mounting on supporting means,
a counter arm or tie. member adapted to be
mounted at its lower end on supporting means 30
at a distance from the foot end ofthe mast and
connected at its upper end with an elevated por
tion of the mast, the mast being so disposed that
the counter arm or tie member is substantially
vertical when the mast and counter arm are op 35
eratively mounted on supporting means, a boom
cent to the foot end of the mast with a pivotal
connection enabling it to swing in the common
plane of the mast and counter arm, and tension 40
means operatively connected with the mast and
boom at points distant from the axis of the swing
ing movement for swinging said boom toward and
away from the mast.
i
26. A crane comprising the combination of a 45
-mast and a boom adapted to be supported ex
boom having a foot end adapted to be mounted
adjacent to the foot end of the mast with a piv
otal arrangement enabling it to swing in the
common plane of the mast and counter arm, and
tension means operatively interconnected be
tween the head portions of mast and boom for
so swinging the boom.
28. A tractor crane comprising the combina
tion with a tractor having a body and traction
units in pivotal connection with said body at op
posite sides thereof to swing about a horizontal
axis, of a mast and boom supported exclusively
by one of said traction units, a member‘ sup
ported exclusively on the other traction unit and
connected to the mast for bracing it, the boom
being pivoted to swing about an axis extending
longitudinally of the tractor, means for applying
force between the mast and boom for swinging
the boom, and means on the boom by which a
ROBERT CASPER SWANEY.
'
Q

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