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2,412,412
Dec. 10, 1946.,
‘ CONTROL MECHANISM FOR HOISTING EQUIPMENT
Filed Oct. 23, 1944
4 Sheets-Sheet 1
Gan/@0501”511.1,
INVENTOR.
ATTORNEY.
m 10, 1946.‘
2,412,412
G. MElLln
CONTROL MECHANISM FOR HOISTING EQUIPMENT
Filed Oct. 23, 1944
v
4 Sheets-Sheet 2
X319. 5'.
éorrne/soji/su. 1,
INVENTOR.
-
ATTORNEY.
Dec. 10, 1946.
G,_ MEIL,
' 2,412,412
CONTROL MECHANISM FOR HOISTING EQUIPMENT
'~
'
110a.
f?
‘20 '
lj?'y'g'
155B
.
INVENTOR.
60777-“2/50 ME/L /,
BY
ATTORNEY.
Patented Dec. 10, 1946
2,412,412
'
UNITED‘ STATES PATENT OFFICE
' 2,412,412
CONTROL MECHANISM FOR HOISTING
,
EQUIPMENT
Gottfried Melli, San Gabriel, CaliL, assignor of 4
one-half to Marlon P. McCa?z'rey, Los Angeles,
Calli.'., and one-half to William Ruddock, South
Pasadena, Calif.
Application October 23, 1944, Serial No. 559,920
15 Claims. (01. 214-140)
X
E
I
,
This invention relates to control mechanism for
hoisting equipment or the like.
_
Many types of hoisting equipment, material
'.
Y
2
i
it is common to provide means exerting a resilien
force continuously urging the brake to engaged
condition. ‘It is enotherwbject of this invention
handling equipment and the like, are provided
to provide a clutch and brake control mechanism
with a winding drum for manipulating the line 5 so arranged that such resilient force cooperates
with the mechanism to provide a fulcrum point
which raises and lowers ‘or otherwise controls the
for the meansoperating the clutch to engage and
load. Such a drum is often operated by means of
apparatus including a friction clutch adapted to
In an application of William Ruddock,.an as
connect the drum to asource of power for rotation '
in a. direction to wind and tension the line, as well 10 signee of the present application, ?led November
disengage.
as a brake for holding the drum against rotation _
when the clutch is disengaged, and to control ro
tation of the drum in the opposite direction to un
wind the line in response to tension therein caused
by the load. It is an object of thisv invention to
provide improved control mechanism for such ap-_
paratus,
‘
_
-
‘
10, 1941, bearing Serial Number 418,557, now Pat
ent No. 2,362,406, granted November 7, 1944, and
entitled "Material handling apparatus,” an appa
ratus is disclosed wherein a material engaging ele
ment or bucket is mounted on one end of a hori
zontally disposed arm which is swingable in a ver
tical plane to raise and lower the bucket. The
arm is pivotally supported on the frame of a trac
In the use of such equipment particularly for
tor or the-like and extends longitudinally of and
hoisting a load, it is important; that the operation
of the clutch and‘ brake be closely ‘correlated. 20 above the tractor, for substantially the , entire
length of the tractor. The bucket'is at the for
Thus/if the load is suspended by the line, the
ward end of the arm, and the bucket and arm are
clutch being disengaged and the brake applied to
controlled by cables passing about suitable sheaves
prevent rotation of the drum, and it is desired to
and downwardly to a pair of winding drums on
raise the load additionally, the clutch must be at
opposite‘sides of the tractor adjacent the rear end
least partly engaged before the brake is entirely
thereof. These drums are mounted on an extenreleased, to prevent dropping the load. While
sion of the tractor frame, and are arranged to be
sucha drop might be only for a short distance,
'
nevertheless it would be a source of danger and _ driven ‘from the tractor power plant through suit
able drive mechanism including a clutch. Brake
productive of severe stresses in the apparatus,
since the clutch and power plant must check such 30 means are also’ provided for these drums. Sub
stantially the entire weight of the bucket and any
downward movement of the load before the load
can be raised. On the other hand, it is necessary
for the brake to be entirely released before the
load therein acts on this ~frame extension through‘
. said cables and drums, the frame extension there
clutch is engaged, as even brief operation of the » by maintaining such weight suspended, and it is '
drum by the power plant with the ‘brake engaged 35 thus liable to distortion and ?exure, causing mis
alignment of the drive mechanism. It is thus an~
imposes an unnecessary load on'the power plant,‘
other object of this invention to provide a driving
‘as well as causing unnecessary and undesirable
mechanism permitting misalignment of its parts,
heating and wear of the brake.‘ ‘It is thus an
and capable of operation under such conditions,
other object of this invention to provide inter:
‘
locking mechanism for simultaneously operating 40 without damage.
a clutch and a brake.
-'I'his invention possesses many other advan
_
When it is desired to lower the load, the brake
and clutch both must be disengaged. 'Thus, it is
another object of this invention to provide such
‘control mechanism, which may be operated 0D 45
tages and has other objects which may be made
more easily apparent from a consideration of one
embodiment of the invention. For this purpose
there is shown a form in the drawings accom
tionally to disengage the clutch and release the
panying and forming part of the present spec
brake.
i?cation.
‘
'
It is still another object of this invention to
provide a clutch and brake control mechanism
wherein the brake is normally engaged and the
clutch is normally disengaged. which is operable
optionally either to release the brake and engage
the clutch, or to release the brake while main
This form will now be described in
detail, illustrating the general principles‘ of the
invention; but "it is to be understood that this '
detailed description is not to .be taken in a lim
iting sense, since the scope of the invention is
best de?ned .by the appended
In the drawings:
-
claims.
'
..
taining the clutch disengaged.
Figure 1‘ is an elevation of material handling
In connection with a normally engaged brake, 65 apparatus incorporating the invention, certain
2,412,412
3
.
parts being broken away to better illustrate the
shaft or rotatable element 28, positioned below
control mechanism;
the shaft I6 and extending longitudinally of
Y _
Figure 2 is a fragmentary plan view of the
the tractor 2 and through the casing 23.
‘ '
structure of Figure 1, taken as indicated by line The shaft 28 is arranged to be driven or re
2-—2 of Figure 1;
5 strained against rotation by the control mecha
nism to be presently described, thereby serving.
Figure 3 is a rear view of the structure of Fig- _
ure 1, taken as indicated by line 3-3 thereon;
Figure 4 is a detail section taken on line 4-4 of
'to control the movement of the arm structure
5 to raise and lower the bucket 3, as well as to
Figure 1;
control the movement of the bucket 3 between
Figure 5 is a cross section taken on line 5-5 10 load dumping and load retaining positions. For
this purpose it is'essential that the gearing 26
of Figure 4;
_
and 21, which may be of the worm or spiral type,
Figure 6 is a detail view, partly in section, of
the control mechanism;
,
should not be self locking.
.
'
Figure 7 is a fragmentary'horizontal cross sec
' ‘The mode of operating such a tractor shovel '
tion, taken on line '|--‘| of Figure 6;
15 is briefly as follows: With the bucket 3 in the
Figure 8 is a vertical cross section, taken on
load retaining position illustrated, the boom 5
is swung about its pivot T by slackening the cable
I‘ to lower'the bucket 3 to the desired loading
position, and the tractor is advanced to'crowd the
line 8-8 of Figure 6;
Figure 9 is a view similar to Figure 6, but show
ing a different operating position of the mech
anism;
20 bucket into the material to cause it to pick up
'
‘Figure 10 is a cross section similar to Figure 7,
a load. With the bucket 3 loaded, the drums l5a ,
taken substantially on line l0—l0 of Figure 9;
and 15b are rotated. to cause the cable I‘ to be
wound thereon, which causes the bucket,3 to be
Figure 11 is a view similar to Figures _6 ‘and 9,.
abut showing still another operating position of
the mechanism; and
,
maintained in load retaining position, and “swings
25‘the arm 5 upwardly -to raise the bucket 3 to a
Figure 12 is a cross section,'taken on line l2-l2
‘ of Figure 6.
desired height, where it is retained by securing ,
the drums I5a and I5!) against rotation. The
tractor 2 is then maneuvered to bring the bucket
3 to the place where it is desired to depositithe
_
Referring to Figure 1 of the drawings, the con
trol mechanism generally indicated by I is shown
as incorporated in a tractor shovel of the type
._ disclosed in said- prior ?led application.
30
load.
'
~
There
Since it is necessary that the cable I‘ be slacked
to permit the bucket 3 to swing downwardly about
in, the material engaging element or bucket 3
is pivotally mounted at 4 on the forward end of
its pivot 4 to dump its load, means independent
an arm or boom structure 5, the bucket 3 and the
of the cable I! ‘must be provided for maintain
arm structure 5 forming a bucket and arm as 35 ing the boom 5 elevated. For this purpose‘an
sembly 8. The arm structure 5 is pivotally sup
additional cable 30 is attached to the rear of
the arm structure 5. The. cable 30 .is wound on
ported at a point 1 intermediate its ends for
a drum 3|, which is rotatably supported above
movement to raise and lower the bucket, by a
the winding shaft 16, by brackets 32 mounted on
frame structure 8 suitably mounted on the frame
40 the sides H! of the supporting frame 20. Brake
9 of the tractor 2._
mechanism 33 is ‘provided to control the rota
As shown in Figures 1 and 3, the arm structure
5 comprises a pair of suitably joined side arms
tion of the‘drum 3|; With the brake 33 oper
ated to prevent rotation of the drum 3|, the cable
5—-a and 5-D, each provided with sheave wheels
H and I2, rotatably mounted on its forward and
30 will act to prevent lowering movement of the _
rear ends respectively,‘ and a tubular top mem g5 arm structure 5 while the bucket 3 is allowed to
swing downwardly about its pivot 4. To provide
ber l3. A cable I4 is suitably attached to the
for automatically winding the line 30 on the drum
top of the bucket 3 near its oposite sides as by
‘3i as the arm structure 5 is moved to raise the
, sheaves, one of which is shown at 311, and has a
pair‘of reaches Ma and Mb extending rearwardly
bucket 3, the drum 3| is arranged to be continu
from the bucket, over the sheaves ii, through 50 ously urged in cable winding direction by a spring.
Thus, the drum 3! and associated parts may be
the tubular top members l3, and over the rear
conveniently termed a spring driven winch and
sheaves i2 to winding drums We and 15b. These
designated in theirv entirety by numeral 35. This
winding drums i5a and I512 are fixed on the op
posite ends of the winding shaft 6'5 which ex
winch 3;’? will be hereinafter more fully described.
tends across the rear end of the tractor 2 and 55 The mechanism for controlling the rotation of
the rotatable element or shaft 28, and thereby
through a speed reducer or transmission 1?. The
cable M extends continuously from one winding
manipulating the bucket 3, will now be described,
attention being directed for this purpose to Fig- '
drum, as l5a. to the bucket 3, between the sheaves
ures 6 to 12. As clearly shown in Figure 6, the
on the bucket, and to the other winding drum
l5b. In this way, stresses in the cable reaches. w shaft 28 projects a short distance out of the hous
ing 23 and is provided with a keyway 28-1-41.
Means 40, forming an extension of the shaft‘
in bearings l8 adjacent the drums I50, and I51),
28, are mounted on the projecting end thereof,
bearings l8 being mounted on side plates ill of
the said means being of novel form, whereby its
the supporting frame 20 of the control mecha 65 attachment in driving relation to the shaft is
simplified, and its space requirementsare sub
nism I. This frame 20 is attached to the frame
Ida and Nb are equalized.
’
The winding shaft‘ i6 is rotatably supported
' of the tractor 2 adjacent the rear end thereof in
. stantially reduced. Further, from an inspection
any suitable manner, and forms an extension of
the tractor frame. Speed reducer Il may be of
of Figure 1, it will be apparent that substantially
the entire weight of the bucket 3 and any load
70 therein, will be transmitted to the frame 20 by
the cable l4, the winding drums I5-a and l5-b,
and their supports, tending to move the frame
20'upwardly. Such upward movement is opposed
by the weight of the tractor 2 acting on the frame
75 20. Under these conditions, there may be a slight
any preferred type, ,several of which are readily
obtainable in the open market, and in general
comprises an oil tight casing 23 providing addi
tional bearings 24' for the shaft IS. The shaft
[6 has a gear 26 ?xed thereon (Figure 6), mesh
ing with a cooperating gear 21 on the driving
I
2,412,412
6
tendency for theframe 28 to be distorted or ?exed
in a direction generally vertical and parallel to
the axis of the shaft 28. The mounting of the
extension forming means 48 on the shaft 28 is
so arranged that any such distortion of the frame
28 is readily accommodated without injury to
ingly, coned and provided with a suitable friction
facing 18. In the relative positions shown in
Figure 6, clearance is present between the facing
‘I3 and the surface "-11, hence the clutch mem
bers 84 and ‘I2 are not in driving relation. Move
ment of the spider 84 axially to the left, causes
_' thev friction surfaces to engage each other, plac
ing the clutch members in driving relation, in a
the driving and control mechanism for the shaft
28 or interference withtits proper operation.
Thus, a tubular mandrel 4|, having a ?ange
well understood manner.
42 adjacent the speed reducer I1, is supported 10
Axial movement is imparted to the clutch
at its ?anged end on a ?anged bushing 43, as by
spider 84 and the hub 83 thereof, by a clutch
having its end portion telescoped over the hub
operating lever or arm ‘I8, having a forked lower
of the bushing and engaging a portion 43-b
end 18 spanning the hub 83 (see Figure 12). The
clutch arm 18 is swing'ably supported by a pair
thereon having an enlarged diameter. A loose
running ?t is provided between the enlarged 15 of clevises ‘II, which are pivotally connected by
pins 18 to the lowerends of the legs of the fork
portion 43-?) of the bushing and the bore of the
18. Each clevis has a threaded shank '|'_I—-a
mandrel, a clearance of the order of .002" being
provided between their engaging surfaces. The
passing through a clearance-hole 18in the wall
mandrel 4| is in driving relation with the bushing
88, nuts 88 and 8| threaded on the shank ‘ll-a,
43, as by a plurality of drive pins 44 secured, as 20 by engaging opposite sides of the wall 88, serving
by welding, in the ?ange'45 of the bushing 43, I
to secure the clevis inv adjusted position.
A thrust bearing 84 is con?ned between the
and passing through clearance holes 42—a, in the
right hand end of the hub 83 and the ?ange 88
?ange 42 of the mandrel.
.
of a bearing cage 88. The cage 88 is axially se
The bushing 43 is mounted on the end portion
cured to the hub 83 by a split ring 81, engaging
of the shaft 28, having a press-?t therewith, and
is prevented from rotating thereon by a key 48
a groove 88 in the surface of the hub and secured
to the cage 8.8 by a plurality of cap screws 88.
engaging a keyway 41 in the bushing and the
In this way, the cage 88 is freely rotatable with f
keyway 28—-a in the shaft/The outer end por
respect to the hub 88. The cage 88 carries a pair
tion of the shaft 28 has a reduced portion 28--b
of projecting pintles 88, which slidingly engage
forming a shoulder 28—-c which cooperates with
grooves or slots 8| formed respectively in the legs
a shoulder 48——a formed in'the bore of the bush
of the fork ‘I8. A bushing 82, freely rotatable on
ing, to‘limit axial movement pf the bushing 43
each pintle 88, is interposed between each pintle
to the left on the shaft 28. The bushing is re
and the sides of’ the cooperating slot 8|. (See
strained against axial movement to the right
.
due to its press ?t on, the‘ shaft 28.v The man 35 Figure 9).
The clutch spider 84 is driven by means of a
drel 4| supported on the bushing 43 is also axi- - sprocket 88, attached to an integral ?ange 88 on
ally ?xed, as will be presently described.
the hub“, by a plurality of cap screws 81. As
As clearly shown in Figure 6, the parts are
best shown in Figures land 2, the sprocket 88
so proportioned, that with the shoulders 28-—c
and 48—a in contact, there is substantial clear 40 is connected to a driving sprocket 88 bya chain
88. The sprocket 88 is ?xed on a shaft I88, which
ance between the ?anges 42 and 48. The de
scribed arrangement permits substantial angular
extends to the forward end of the tractor, where
it is suitably connected to the tractor motor.
misalignment between the shaft 28 and the man
In this way, whenever the tractor motor is in
drel 8|, such as might be caused by upward ?ex
operation, the clutch spider 84 is rotating, and
ing of the frame 28, without any cramping or
by. appropriate operation of the clutch operating
damage, and without any interference with the
- arm 18, the drums IE-a. and |8-b can be caused
transfer of rotational force between the shaft
to rotate, to raise the bucket 3 and the arm 8.
and the mandrel.
The brake drum 18 is embraced by-a cooperat
The opposite or right hand end of the mandrel
4| has a portion‘ 48 of reduced diameter, on which 60 ing brake band ‘ill-a, carrying suitable brake
is secured the inner race 80 of an anti-friction
lining '||I--b, and which is normally urged into
engagement with the drum to prevent rotation ,
radial and thrust bearing 5|, as by a set screw
thereof (see Figures 6, 7 and 8). Thus, project-'
82. The outer race '53 of the bearing 50 issup
ing ears I 02 and I83 are secured on the band
ported in a bearing cage 84 attached to a vertical
'|8—a near its ends. A rod I84 extends slidably
transverse wall 55 of the supporting frame 28.
through an opening'in each ear, and-has abut
A thrust button 88, seated on a shoulder 88 with,
ments I88 or I88 at its opposite ends, which abut
in the bore of the mandrel 4|, has a convex
\ments may conveniently be inrthe form of nuts
face or thrust surface,,80, which contacts the
threaded on the rod I84. Compression springs
end surface of the shaft 28. A sleeve 8|, pressed
on the exterior of the mandrel 4|, provides a 60 I81 and I88 are respectively con?ned between the
ear I83 and abutment I88 and between the ear
bearing surface 82 for the hub 83 of the driving
III-2 and abutment I88, urging these ears together,
member or spider 84 of a friction clutch 88, and
and causing the band ‘III-a to engage the drum.
cooperates with an annular groove 88 in the
The band 18-0. is maintained ‘against rotating
mandrel 4| to‘ form a lubricant chamber. Lubri
cant may be placed in this chamber through a 65 with the drum 18 in any convenient manner, as
by an anchor link I88, pivotally connected to the
conventional pressure ?tting and passageway
band ‘ill-a, as at I|I8—a, and to the frame 28, as
(not shown), and escapes to lubricate the sur
at |08—-b.
.
face 82, through one or more pasageways 81 ex
For releasing the brake, a pair of arms “8
tending through the sleeve 8|.
A brake drum "I0 is secured to the ?ange 42 of 70 and III are each pivotally connected at one end,
as H2 and M3, to a bracket “4 secured to the
the mandrel 4| by a plurality of bolts ‘III, which
wall 88. The opposite ends of these arms engage
also serve to ‘attach the driven member 72 of
respectively the facing surfaces I82--a and
the clutch 88 to the ?ange 42. The member 12,
’|88—a of the ears I82 and I83, being supported
has a coned inner surface '|2—a, the outer face
84-11 of the clutchsnider 84 being correspond 76 on the ears by lugs‘ II8 and Ill. The links II8
2,412,412
relation between the engagement of the clutch
and the release of the brake may be altered by
adjusting the spacing of the pivots H2 and H3
which mount the arms "0 and I II, and by alter
and “3' are pivoted respectively at one end,‘ as
I20 and I2I, to the arms H0 and III, and are
pivotally connected at their opposite ends by a,
pin I22 to form a toggle. An operating or brake
release member I23 (see Figure '1) is also con
nected to the links H8 and H9 by the pin I22,
and by movement to the right, and parallel with
the axis of the mandrel 4I, urges the toggle links
ing the tension of the springs I01 and I08. For
this purpose a plurality of holes II4-'—a and
II4--b are provided for optionally receiving the
pins
H2
and
H3.
"
'
.
.
The provision of the stop I30 makes it possible
I I8 and I I9 to a position in ‘which they are more
nearly in alignment, causing the arms IIO,.,and 10 also to release the brake while maintaining the
clutch disengaged. Thus, if the rod I21 is urged
III to urge ears I02 and I03 apart against the
to the right, from the position of Figure 6, as indi
force of the springs I01 and I08. The band
10-11, is thus released fromvthe drum 10. Suit
able stops, such as lugs IIO-a and III—a on the
arms H0 and II I, are provided to appropriately
restrict movement of the links “8 and H9 into
a position in which they would be aligned, and
cated by the dotted arrow I34, the lever I25 will
swing about the pivot I26 until it encounters the
stop I30, after which the lever I25 and the arm
15 will swing as a unit about the pins 18, moving
the clutch spider 64 further away from the driven
clutch member 12, and moving the brake release
possibly prevent return of the band 10-0. into
engagement with the drum 10.
member I23 to the right to release the brake as
'
Since as-previously pointed out, it is desirable 20 before. The relative positions of the parts will
to interlock the operation of the clutch 65 and
the brake mechanism justdescribed, an operat
ing lever I25 for the brake release member I23
is provided, which is pivotally joined to the mem
ber I23 at I24, and is pivotally mounted at I25 25
near the upper end of the clutch operating arm
15. The lever I25 is arranged to be manipu
lated by a rod I21, pivoted to the upper end
thereof at I28. Additionally, adjustable stop
now be as illustrated in Figure .11. Thus, when
it is desired to lowerthe load, it is again only
necessary to move a single control means, the
hand lever I35, but in the opposite direction to
that which causes the load to be hoisted.
'
As shown in Figures 1 and 2, the hand lever
I35 is located so as to be conveniently reached by
the operator. Thus, it is pivotally supported at
the operator’s right by a bracket I36 on the
iting movement of the lever I25 with respect
30 frame of the tractor 2, and is connected to the
, rod I21 by a rod I31 and a lever I38 pivoted to
thereto. This stop means may comprise a cap
screw I3l, threaded through a suitable aperture
in theupper end of the arm 15, and secured in
retain the lever_ I35 against undesired movement.
means I30 are provided on the arm 15, for lim
adjusted position by a nut I32.
Assuming that‘ all parts‘ ‘are in the relative
positions ‘shown in Figures 6, '1 and 8, which may .
the frame at an intermediate point I30. A suit—
able latch arrangement I40 may be provided, to
The spring driven winch 35 will now be de-.
scribed, reference for this purpose being had to
Figures 4 and 5. Thus, a shaft I45 ‘is supported
and secured against rotation inthe previously
mentioned brackets 32. The drum 3| upon which
shaft 28 held against rotation by the brake band
10-0, and clutch 65 disengaged; then upon move 40 the cable 30 is wound, is provided with heads I46
and I41 at its opposite ends having’bosses I48
ment of the rod I21 to the left, as indicated by
and I49, whichrotatably support the drum on
the solid arrow I33 (Figure 6), the lever I25 will
the shaft I45. A sleeve I50, having an internal
pivot-about its connection I24 to the member
diameter larger than the diameter of the shaft
I23, and swing the arm 15, to cause the clutch
I45, is secured at one end to the shaft I45 by a
spider-64 to engage the clutch ‘member 12, the
pin I52 passing through the sleeve and a spacer
parts now being in the relative positions illusI5! positioned between the sleeve and the shaft.
trated in Figure 9. This is because the force
The other end of the sleeve I50 telescopes over
exerted by the springs I01 and I08 opposes sepa
the inner end of the hub I49, the hub being ro
ration of the arms H0 and III and the straight
ening of the toggle links “8 and H9. The force - tatable in the annular space between the shaft
and the sleeve.
'
of the springs I01 and I00 thus cooperates to
A spiral spring I53 is supported on the ‘sleeve
restrain movement of the pin I24 so that‘ it
I50, and- is appropriately anchored at one end I54
forms a fulcrum for the lever I25. Upon en
to the hub I48, and at the other end I55 to the
gagement of the clutch members 64 andv 12, the
sleeve I50. Thus, rotation of the drum 3I in
clutch arm 15 is restrained against further move-1
one
direction is opposed by the spring I53, which
ment to the left, and the pin I26 becomes the
urges the drum to rotate in the opposite direction.
fulcrum about which the lever I25 swings in re
The arrangement\is such that as the cable 30
sponse to continued movement to the‘ left.
- be considered the normal condition, with the
Such movement of the lever I25 then becomes ' is unwound from the drum 3I in response to ten
effective to urge the toggle links H8 and “8 60 sion in the cable, the spring I53 is energized.
.to a position in which they are more nearly in
alignment. This urges thelevers H0 .and III
apart against the force of the springs I01 and
I08, and releases the brake band 10-a.
'
Upon su?lcient reduction of the tension in the
cable 30, the spring I53 rotates the drum 3I to re
‘ wind. the cable thereon and maintain it free of I
slack.
'
The brake 33 for controlling or preventing ro
tation of the drum 3| is a conventional band
brake. Thus, a brake drum I54 is suitably se
cured to one end of the drum 3| and is embraced‘
is released, and the possibility of accidentally
by a band I55, which is operated to enzage the
dropping the bucket or load is guarded against.
It can also be assured that the brake is fully 70 drum by a bell crank I56 and a brake rod I51.
Brake rod I51 is connected to a pedal I50 (see
released when the clutch is engaged. Further;
In this way, by appropriate adjustment of the
parts, it canv be assured that the clutch 65 is
always at least partly engaged before the brake
more, the operation of the apparatus is simpli?ed,v
since but one movement of a single control means
such as a hand lever I35 (Figure 1) is necessary
Figure 1) for manipulation by the operator.
The operation of the mechanism may now be. I
reviewed.- With the tractor motor operating, and
to operate both the brake and the clutch; The 75 the control lever I35 in the neutral position of ,
2,412,412
,
10
Figure 1, the brake band ‘IO-a is engaged and
the clutch 65 is disengaged, as described in con
nection with Figure 6. The bucket 3 and the
ment of said member in one directionv causes
release of the brake while maintaining the clutch
disengaged and in another direction causes en
arm 5 are thus held against movement. ‘ The con
gagement of the clutch and release of the brake,
trol lever I35 is then moved toward the left (Fig
ure 1), or toward the operator, which releases
and means acting independently of said drum for
optionally maintaining said arm against move
the brake band ‘|I|—a and allows the bucket 3 and
ment to lower the bucket. '
i
3. In material handling equipment, a bucket
and arm assembly movable to raise and lower the
desired point. After this the lever I35 is re
turned to the mid-position or neutral, resetting l0 bucket, said bucket being movable on said arm
the arm 5 to lower in response to gravity to a
so that the drum 3| is rotated by the cable 30
between load retaining and load dumping posi
tions,"a rotatable drum, means connecting said
unwinding therefrom, such rotation serving to
energize the spring I53. The tractor is then ad
drum in one direction serves to move the bucket
the brake. The brake 33 is normally disengaged.
drum with the bucket whereby rotation of the
vanced to cause the bucket 3 to pick up a load. 15 to-load retaining position and thereafter to move
_ When the bucket is loaded, the lever I35 is moved
the arm to raise'the bucket, means to optionally
toward the right (Figure 1) which simultaneously
cause rotation of said drum in said one direc
releases the brake band ‘Ill-a and engages-the
tion comprising a clutch for connecting said
clutch 65, raising the arm 5 and the bucket 3.
drum with a source of power, a spring driven,
Due to the interlocking arrangement of the clutch 20 brake controlled winch for optionally maintain
and brake control previously described, no par
ing said arm against movement to’ lower the
ticular skill is required of the operator to avoid
bucket, a normally engaged brake for preventing
dropping the load either in initially raising the
rotation of the drum, means for optionally re
load, or in subsequently raising it an additional
leasing the brake, means for actuating the clutch
distance.
'
to engage and disengage, and means interlocking
As the load is raised, the cable 30 is automati
said clutch actuating means and the brake re
cally wound upon the drum 3| of the spring
lease means for substantially simultaneous op
driven winch, the brake 33 being'disengaged to
eration,
permit the drum 3I to be driven by the spring
4. In material ‘handling equipment, a bucket
I53. When it is desired to dump the load, the 30 and arm assembly movable to raise and lower the
control lever I35 is moved to neutral and the
bucket, said bucket being movable on said arm
between load retaining» and load dumping posi
brake 33 is applied by means of the pedal I 58,‘to
prevent, the drum 3I rotating, which serves to
tions, arotatable drum, means connecting said
hold the arm 5 against downward movement, the
drum with the bucket whereby rotation of the
bucket 3 being held against dumping by the nor 35 drum in one direction serves to move the bucket
mally engaged brake band ‘I0--a. Upon move
to load retaining position and thereafter to
move the arm to raise the bucket, means to
ment of the lever I35 to the left, the brake band
'I0—a is disengaged. allowing the bucket 3 to
optionally cause rotation of said drum in said
swing down about the pivot 4 and dump. The,
one direction comprising a clutch for connecting
arm 5, together with the bucket‘ may now be
said drum with a source of power, means inde
pendent of said drum for maintaining said arm
lowered by release of the brake 33, brake ‘III-41
being maintained disengaged for this purpose,
against movement to lower the bucket, a nor
I claim:'
mally engaged brake preventing rotation of the
1. In material handling equipment, a bucket
drum, means for optionally releasing the brake,
and arm assembly movable to raise and lower the
means for actuating the clutch to engage and
bucket, said bucket being movable on said arm
disengage, a common operating member for said _
between load retaining and load dumping posi
tions, a rotatable drum, means connecting said
drum with the bucket, whereby rotation of the
drum in one direction serves to move the bucket
to load retaining position and thereafter to move .
the arm to raise the bucket, means to optionally
cause rotation of the drum in said one direction,
means independent of said drum for optionally
restraining said arm against movement to lower
the bucket, means for controlling rotation of the
drum optionally to maintain the bucket in load
retaining position or to permit the bucket to
dump while said arm is restrained, and common
actuating means for said rotation causing means
and said control means.
2. In material handling equipment, a bucket
and arm assembly movable to raise and lower
the bucket, said bucket being movable on said
arm between load retaining and load dumping
positions, a rotatable drum, means connecting
, clutch and brake, and means forming an inter
lock between the brake releasing means and the
clutch actuating means whereby movement of the
operating member in one direction releases the
brake and engages the clutch and in another di
rection disengages the clutch and releases the
brake.
5. In. control mechanism for a rotatable ele
ment, a friction clutch having a pair of relatively
axially movable members adapted to be moved‘
into engagement for connecting said element with
a source of \power, an arm movable axially of ,
said element for moving said clutch members 0t
engage and disengage, a brake for controlling
rotation of said element, a brake actuating mem
ber also movable axially of said element, means
for movingsaid arm to cause the clutch to en
gage or disengage, comprising a member pivoted
said drum withthe bucket whereby ,rotation of
on the arm, said member also being joined to
the brake actuating member, and means forming
a stop for limiting relative movement between
the drum in one direction serves to move the
said arm and said member in one direction.
bucket to load retaining position and thereafter
6. In control mechanism for a’ rotatable ele
to move the arm .to raise the bucket, means 70 ment, a friction clutch for connecting said ele
controlling operation of .the bucket and arm
assembly comprising a brake normally acting to
ment with a source, of power, a brake for con
trolling rotation of said element, a pivoted arm
-' prevent rotation of the drum, a clutch for con
for actuating the clutch, a brake actuating mem
meeting the drum for rotation by a source of
ber, an operating member pivoted on the arm
power, a control member, means whereby move 75 and pivoted at one end to the brake actuating
2,412,412
‘11 '
member, means for restricting movement of said
operating member with respect to the arm in
one direction to cause said member and said
arm to move-as a unit about the pivot of the‘
arm and move the brake actuating member in
brake releasing direction, and to release the
clutch.
'
-
, 12
clutch, or torelease the brake and disengage the
clutch in accordance with the direction of move‘
ment of said means.
11. In control mechanism for a rotatable ele
ment, a friction clutch including a member mov
able axially to cause the clutch to connect said
element with a source of power, a brake for con
-
trolling rotation of said element, means exerting
a resilient force urging said brake to prevent. ro
ment, a friction clutch for connecting said ele
tation
of said element, a brake release member
10
ment with a source of power, a normally engaged
movable to release the brake against said force,
brake for preventing rotation of said element,
'7. In control mechanism for a rotatable ele- -
and an operating lever pivoted on said brake re
lease member, movement of said lever about said
pivot causing axial movement of the clutch mem
site direction to disengage the clutch, brake
actuating mechanism including a member mov 15 ber, said force‘ exerting means restraining move
ment of the brake release member to cause the
able to release the brake, an operating member
pivotal connection .to form a’ fulcrum for said
pivoted on said arm and connected to said brake
lever.
release member, and stop means for limiting
12. In control mechanism for a rotatable ele
movement between said member and said arm
ment,
said element having a projection, a. man
’ in one direction whereby upon movement of said
drel telescoped at one end over said projection
member in said one direction, said member‘ and
and rotatably supported at its opposite end, a
a pivoted arm movable in one direction to cause
the clutch to engage and movable in the oppo-~
said arm move as a unit to release the brake, -
movement of said member in the opposite direc
friction clutch including a member ?xed on said
its connection on said arm to release the brake.
8. In control mechanism for a rotatable ele
members being, in driving relation by virtue of
mandrel and a member axially movable as well
tion causing said member to fulcrum about its
connection to the brake release mechanism to 25 as freely rotatable on‘ said mandrel, means for
controlling the rotation of said member, and
swing said arm to engage the clutch, said mem
means
exerting a force urging said member into
ber after engagement of the clutch, pivoting about
axial engagement'with the ?xed member, said }
ment, a friction clutch for connecting said ele 80 said force, and a thrust surface carried by said
mandrel engaging said projection, whereby said
ment with a source of power, a normally engaged
force is transmitted, from the member ?xed in
brake preventing rotation‘ of said element, a
they mandrel to said element. ~
_
pivoted arm for urging said clutch to engage,
13. In control mechanism for a rotatable ele
brake-actuating mechanism including a brake
release member movable to release the brake, an 35 ment, a frame on which said element is rotatably
supported and which is subject to ?exure in a
operating member pivoted at spaced points to
direction generally parallel with the axis of ro
said arm and to said brake release member, and
tation of said element, said element including
means for moving said operating member to
cause said arm to engage the clutch, said member ‘ a projection, a mandrel having a bore telescoped
fulcruming about its pivot on said arm in re 40 at oneend oversaid projection, and rotatably
supported on said frame at its opposite end,_
means forming a cylindrical surface of enlarged
release member to release the brake.
diameter and limited axial extent on said projec
9. In control mechanism for a rotatable ele
tion for engaging the bore of the mandrel, where
ment, a friction clutch for connecting said ele
ment with a source of power, a normally engaged 45 by clearance is provided within said bore permit- ‘
ting angular misalignment of said element and
brake preventing rotation of said element, a
said mandrel,v means connecting said element and
pivoted arm for’ urging said clutch to engage,.
said mandrel in a driving relation, a friction.
7' brake=actuating mechanism including a brake re
clutch including a’ member ?xed on'said mandrel
lease member movable to release the brake, an
sponse to continued movement toimove the brake
operating. member pivoted at spaced points to 50 and a member rotatable on 'said mandrel and
said arm and to said brake release member, and
means for moving said operating member to cause
said arm to engage the clutch, said member: ful
" axially movable into engagement with the other
member, said members being adapted to be in
driving relation by virtue of ‘an axial force urge
ing said members into engagement, means con
cruming about its pivot on said arm in response
to continued movement to move the brake release 55 trolling rotation of the member mounted on the
mandrel, andmeans forming a thrust surface in
member to release the brake, and means forming
said mandrel for engaging the end of said proiec- '
a'stop to limit movement ofsaid operating mem
~ tion and restraining‘ axial movement of the man
ber with respect to said am in the opposite di
drel in response to said force.
rection, whereby a predetermined movement of
said member in said opposite direction causes said ‘60 14. In control mechanism fora rotatable ele- v
ment, a brake mechanism, means exerting a resil
member and said arm to move as a unit and re
ient force to cause said brake to restrain rotation
lease the brake.
_
of said element, a clutch including an axially
10. In control mechanism for a rotatable ele
ment, v a friction clutch including a member mov
, movable member serving'upon movement in one
able axially to cause the clutch to connect said 65 direction to connect said element with a source
of power, an arm‘ for moving said axially mov
element withv a source of power, a brake for con
able member, a lever pivoted on said arm, means
trolling rotation of said element, means urging
for moving said lever, and means forming a con
applicationcf said brake to prevent rotation of
nection
between said lever and said force exerting
said element, a brake release member movable
substantially parallel with said axially movable 70 means and providing a movable fulcrum for said
lever, the force exerted by said force exerting
clutch member for releasing the brake, and op
means opposing movement of said fulcrum,
erating means including a pivoted lever, connect
whereby movement of said lever in one direction
ing said clutch member and said brake release
causes I said arm to move . said movable clutch
member for simultaneous operation, ‘movable
optionally to release the brake and engage the 75 member.
3,419,412
13
a
a
14
' 15. In control mechanism for a rotatable ele
pivot and causing said arm to operate the clutch
ment, a friction clutch for connecting said ele
ment with ‘a source of power, a normally engaged
brake i'or controlling rotation of said element.
and common operating means for said clutch and
said brake, comprising a movable arm for op
erating said clutch to engage and disengage, a
to engage, stop means on said arm engageable by
said member in response to movement of said
member pivoted on said arm and connected with
member in the opposite direction about its pivot,
said am and said member moving thereafter as
a unit. and causing said point of connection on
said member to move in brake releasing direction, ‘
and an operating element connected to said arm
for optionally imparting movement in either di-'
said brake at a point spaced ,irom the pivot for
causing said brake to release in response to move 10 rection thereto.
GO'I'I'FRIED MEILI.
ment of said member in one direction ‘about its
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