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Патент USA US2122943

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yJuly 5, 1938.
F. o. JAECKEL
2,122,943
SAFETY CATCH FORl HOIST CONVEYANCES
Filed Aug. 11, 195s
Franz Unto Jaeclíel
2,122,943
Patented July 5, 1938
UNITED STATES PATENT OFFICE
2,122,943
SAFETY CATCH Foa Hols'r' ooNvEYANcEs
Franz Otto Jaeckel, Johannesburg, Transvaal,
Union of South Africa.
Application August 11, 1936, Serial No. 95,474
'In the Union of South Africa August 15, 1935
is claims. (Cl. 187-86)
The present invention relates to `safety catch
mechanism provided in hoisting systems for stop
ping and holding the conveyance in the event of
the hoist rope breaking or other dangerous con
5 ditions of a similar nature occurring; such mech
anism being of the kind which brakes the con
veyance by frictional engagement with the con
veyance guides or like ñxed parts.
The object generally of the invention is to pro
10 vide safety catch mechanism which will operate
satisfactorily under various conditions of danger
which are likely to occur, particularly in mine
hoist systems.
>
The main object of the invention is to provide
15 safety catch mechanism on the conveyance
which will operate as soon as the hoisting rope
is overstressed so as to brake the conveyance
and to release therope, and so as to prevent,
if possible, the rope being stressed to braking
20
point.
'
Accordingly if the car is accidentally danger
ously overloaded and the rope is thus ‘over
stressed, the rope will be released and the car
Will be simultaneously braked; also if the wind~
25 ing rope should break while the conveyance is
descending ‘and the loose end of the length re
maining attached to theconveyance should catch
in the shaft,-it will be prevented from stopping
the conveyance suddenly lor pulling off the brake.
Another `object »of the invention is to exert the
30
braking pressure evenly overa large Ybrake shoe
area; thereby bringing the conveyance to rest
with certainty `but sufficiently gradually to avoid
Ádangerous shocks to persons travelling in the
conveyance, and thereby also making the safety
35
catch mechanism suitable for use with metal
guides. The Acommonly employed safety catches
are suitable for use only with wooden guides.
An example of the invention is shown in the
40 accompanying drawing which is a `perspective
view.
The conveyance shown is `an ore skip working
-in »a vertical mine shaft equipped with fixed
`rguide rails indicated by 2, 2. The skip comprises
the body 3 mounted in a frame.
The‘top» mem
ber of the frame consists of the spaced vertical
plates 4, 4. The side members of the frame in
clude slipper sections 5, 5 and 6, E, the sections 5,
5 ‘being fixed to the ends of the plates `4, 4; and
both sections 5, A5 and ’5, «6 slidingly engaging
the guides 2, 2. The side members of the frame
'also include castings :'I, l', which are interposed
between and connect the slipper sections 5 land
«6, and >which `are further described hereafter.
The winding rope, indicated by 8, is attached
255
to the king bolt 9; at the lower ‘end of which a
cross head I0 is retained by the nut II and lock
nut I2.
Between said cross head I0 and a collar
I3 slipped onto the king bolt there extend a
tubular distance piece I4 and a compressed Ul
spring I5. The distance piece I4 limits the ex
tent to which the cross head ‘ID and the collar I3
can approach one another, and 1t encloses the
spring I5. It also provides the king bolt assem
bly with a smooth external surface for engage
10
ment with the split tubular guide I6, I6 which is
fixed to the cross beam to guide the'king bolt
assembly for vertical movement relatively to the
skip.
'
'
The skip issuspended from the collarV I3 by 15
means of levers I1, I1 and I8, I8 at opposite sides
of the collar, each consisting of a pair of lever
arms I1, 18 respectively. Each such lever is piv
otally mounted on a bearing pedestal I9 secured
to a channel member 2|) fixed between the plates 20
4, 4 of the cross beam..
The collar ends of the
levers Il, I8 seat in pockets 2I, the bearing sur
faces of which are provided by pins 22 inserted
transversely into the collar at the opposite sides
thereof. The outer end of each lever I1, I1 and 25
I8, I8 is supported by engagement with‘pintles
23 extending transversely from a cap 24 which
in turn is supported on a compression spring 25,
resting on a shelf 26 fixed to the cross beam 4, 4.
Extending through the cap 24, the spring 25 and 30
the shelf 26 is a slidable rod l2l provided below
the cap with a collar 28 which is normally spaced
somewhat away from the cap. Said rod is fur
ther provided with a transverse pin 29 which
rests on the shelf 26 and soY supports the rod, 35
but which can be sheared oiï Yagainst the shelf
upon the rod being forcibly driven downward.
The lower end 21a of the rod, below the pin 29
is made adjustable in length by means of -a turn
buckle device 30.
`
.
40
The king bolt 9 shown is of square section as
is usual to counteract the tendency of the rope
to twist one way or another as the conveyance
is being raised or lowered. The cross head I0
has a corresponding square hole for the bolt; and 45
is held against'rotation by a -Ipair of ears 3I en
gaging the slots 32 between complemental parts
of the split tubular guide I6, I6.
Considering now the brake mechanism proper,
.each side o-f each casting .l embodies a number 50
of hydraulic brake cylinders 33 arranged in a
row parallel with the shaft guides 2 with their
axes transverse to the side faces 34 of said guides
2. The rams 35 of <the several cylinders form
ing each vertical row are all connected to a, 55
2
2,122,943
brake shoe plate 36 faced with brake fabric 31
and positioned sufficiently close to Ithe guide
side faces 34 to engage the latter without undue
idle movement. They are normally held out of
contact with said guide faces by compression
springs 38 mounted on rods 39 extending trans
versely from the ends of the brake shoes 36.
Nuts 4U on said rods enable close adjustment of
their normal spacing from the guide faces 34.
The described arrangement of several small
hydraulic rams in line, gives the eifect of a large
total ram area commensurate with a large brake
shoe area, while permitting a convenient ar
rangement of the brake cylinders within the small
15 space available for them.
.
The hydraulic power for operating'the brake
rams 35 is obtained from compressed springs 4|.
These tend to force apart the plates v42 fixed to
the respective rams 43 of a pair of motor hy
draulicvcylinders 44 mounted in the frame on
bearers 45. Said motor cylinders are connected
to the brake cylinders 33 by piping indicated by
the dotted lines 46.
The motor rams 43 are
normally held fully extended from their cyl
25 inders 44 and the springs 4| correspondingly
fully compressed, by pairs of open-topped hooks
41 which engage pins 48 extending transversely
from projections 49 on the plates 42. Said hooks
are also arranged to function as bearings on
30 their respective pins 48. They extend from the
stem 56 of a T shaped lever 56, 5|, 52; the arms
5|, 52 of which are lightened by being split.
Light springs 53 hung from the cross beam 4, 4
sustain the weight of said T lever and hold the
hooks 41 in engagement with the'pins 48. The
T lever is thus retained in a fixed position, while
being capable of downward and tilting move
The T lever functions as a trigger for releas
ing the rams 43 and it will be seen that it can
release the rams either by being bodily depressed,
when it disengages both pairs of hooks 41 from
their pins 48, or by being tilted, in which case
it- fulcrums about one pair of pins 48 and re
leases the other pair of pins, whereupon the pins
that acted as a fulcrum readily slip off their
hooks.
Upon the winding rope becoming overstressed
the T lever is operated as` follows:
50
,
The tension of the rope is resisted by the cage
suspending springs 25-which thus incidentally
make the connection of the rop-e to the skip elas
tic. Rope tension materially above normal ac
cordingly has the effect of so additionally com
55 pressing each such spring 25 that the capl 24
makes contact with the collar 28 and the pin
29 is subjected to shear. The resistance of said
pin to shearing presents a safeguard against the
brake being brought into action merely by say
60 a tension surge in the rope; but more danger
ous tensioning of the rope will cause the pin to
shear through. The lower end 21a of the rod 21
is so adjusted lengthwise that at that moment it
trips the T lever, thereby forcing the latter down
65 and disengaging the hooks 41. The result is
that the springs 4| thrust in the motor rams
43, in turn forcing out the brake rams 35 and
pressing the brake shoes 36 against the sides 34
of the guides 2.
zo Also, upon the shearing of the pin, the levers
| 1, I8 are free to swing upward and release the
collar |3. The whole king bolt assembly is thus
released from the skip and with it the rope; and
further stressing of the latter is avoided.
`
78 f In the shown embodiment of the invention
when an emergency occurs.
Attached to the cross head | 6 is a pair of down
wardly extending rods 54 formed with feet 55
to engage the split arms 5|, 52 of the T lever;
the rods being adjustable relatively to the cross
head by means of nuts 56 in order to bring the
feet 55 close to the lever arms 5i, 52. Accord
ingly in the event of the rope 8 breaking, without
being subjected to stress much above normal; as
sometimes happens; or if the king bolt breaks
or loses its nuts ||, '|2; or if a rising skip over
runs the rope; or if the rope otherwise ceases to
be tensioned, the compressed spring |5 extends
and drives the rods 54 against the top of the T
lever, thereby forcing the latter down and so
applying the brakes.
ForV minimizing damage by overwinding the
conveyance beyond its proper stopping place in 20
theY head gear, the rods 21 are provided with
upward extensions 21h arranged to strike beams
such as 51 or other obstructions provided for
that purpose in theV head gear. Upon this oc
curring the slidable rods 21 are forced down rela
tively to the skip as described, and the brakes
are applied to hold the skip suspended without
the rope.
Under certain circumstances it may be desir
able to stop the skip at some point of its possi- ,
ble path, for instance to prevent its being lowered
into a sump or in case the proper winding speed
is exceeded on an upward journey. For such case
there is provided the arm 58 extending from one
end of the T lever and beyond the regular path i:
swept out by the rest of the skip structure. An
obstruction is arranged in the path of this arm
ment against the resistance of the springs 53.
45
various additional agencies are provided for moving the T lever and thus releasing the rams 43
so as to engage the latter when the skip passes
and thereby tilt the T lever, and thereby apply
the brakes.
The obstruction may be a block l
such as 59 placed below the normal path of the
arm 58 >to prevent the skip travelling farther
downward. Another kind of obstruction indi
cated by 66 may be a movable block which is
projected into the path of the arm 58 as re
quired, for instance a block which is thus pro
jected by means of a governor device when the
speed of the hoist drum exceeds a given limit.
Another way in which the T lever may be
tripped is by means of a hand rope 6|, the lower
end of which is passed into the cage when the
conveyance is constructed for hoisting men.
For the sake of safety it is preferred to divide
the whole hydraulic system into separate smaller
units, so that if one unit fails, another or others '
are available to effect partial braking. In this
case each motor cylinder 44 is connected only
to the brake cylinders 33 at its side of the con
veyance. Pipe connections for these conditions
are indicated.
60
After the apparatus has operated to stop the
skip, it is necessary to restore regular working
conditions to provide a further store of energy
by re-compression of the motor springs 4| and
by releasing the brake shoes 36, For this pur
pose there is shown a drum 62 constituting a
sump for brake liquid and containing two pumps
63, 63 each connected to its respective motor
cylinder 44. By oscillating the pump handle, 64,
liquid is forced into the cylinders 44, thereby 70
projecting the rams 43 and compressing the
springs 4| until the pins 48 can again be engaged
by the hooks 41. Brake liquid is thereupon re
leased from each hydraulic circuit and led into
the sump 62 by opening the valves 65 until the 75
4
8,` The‘conibi'natioh with ahoiist conveyance, of
have withdrawn the. brakegsíhoessito 'energy
storing means thereon, conveyance brak
their 'fully retracted position; the A‘valves `65 being
thereupön closed. The hoisting rope l8 ‘has mean
l" lhile been replaced or re-conn'ected and the 'pins
’29, if sheared, replaced.
I Claim:
p
"
.
i
i
A
-‘ng means_iactuated `by release 'of the stored en
device for releasing the stored
bolt for attachment of the hoist
`
,.
rope and "supported for endwise movement, a
"spring‘tending Lto move Vit downward from its nor
l. The combination with `a hoist conveyance,
downward from
of brake shoes, hydraulic -cylinder ’and 'ram lsets bmal posit1on, a rod ‘exten-ding
the king bolt, a pair of
fthe
'king
bolt,
'a
Support
'on
operating sembrare shoes, a brera-unc icyiin‘dsr ‘i‘ev'ersipivoted to ‘the ‘conveyance frame at median
and ram set connected 'to the brake 'sets to ‘actu "points an'd 'h'av'ing their ‘adjacentends resting on
atè them, 'a deio'rmëd's'pring tending to force in the support, springs upholding the outer ends
the ram of the set, means locking said ram in its
extended position and means rendered operative
by abnormal hoisting conditions to unlock said
locking means.
2. The combination of a hoist conveyance and
a hoist rope ‘by which the conveyance is sus
pended, conveyance braking means adapted to
act on iixed guides, a trigger restraining the
operation of said braking means and means re
sponsive to excess tension of the rope for oper
ating the trigger and thereby permitting the
10
of the levers, rods arranged to be forced down
ward by downward movement of the outer ends
of the levers, means responsive to excess tension
in the king bolt for resisting such movement of
the lever ends, all of said rods being arranged
to actuate the trigger device, and said levers
being arranged to release the king bolt upon
20
upward movement of their adjacent ends.
9. The combination with a hoist conveyance,
of energy storing means thereon, conveyance
braking means, a hydraulic transmission actuated
operation of the braking means.
3. The combination with a hoist conveyance, by release of the stored energy and in turn actu 25
, ating the braking means, a rope from which the
25 of energy storing means thereon, conveyance conveyance is normally suspended, a king bolt for
braking means, a hydraulic transmission actu
ated by release of the stored energy and in turn attachment of the hoist rope and supported for
actuating the braking means, a trigger device for endwise movement, a spring tending tol move it
releasing the stored energy, and means responsive downward from its normal position, a rod ex 30
tending downward from the king bolt, a support
30 to change in the tension of the hoist rope for on the king bolt, a pair of levers pivoted to the
actuating the trigger device.
.
»
4. The combination with a hoist conveyance of conveyance frame at median points and having
means for releasably attaching the rope thereto, their adjacent ends resting on the support, springs
upholding the outer ends of the levers, rods ar
energy storing means thereon, conveyance brak
ranged to be forced downward by downward 35
ing
means
actuated
by
release
of
the
stored
en~
35
ergy, a trigger device for releasing the stored movement of the outer ends of the levers, means
energy, and means responsive to excess tension responsive to excess tension in the king bolt for
resisting such movement of the lever ends, all of
in the rope for both releasing the rope and actu
said rods being arranged to actuate the braking
ating the trigger device.
40
5. The combination with a hoist conveyance, of means, and said levers being arranged to release
means for releasably attaching the rope thereto, the king bolt upon upward movement of their
adjacent ends.
energy storing means thereon, conveyance brak
10'. The combination with a hoist conveyance,
ing means actuated by release of the stored en»
ergy, means responsive to excess tension in the of energy storing means thereon, conveyance 45
rope for both actuating the braking means and braking means actuated by release of the stored
45
releasing the rope, and a selectively frangìble energy, a king bolt for attachment of the hoist
rope and supported for endwise movement, a
stop device for resisting releaseof the rope.
6. The combination with a hoist conveyance, of spring tending to move it downward from its nor
means for releasably attaching the rope thereto, mal position, a rod extending downward from 50
the king bolt, a support on the king bolt, a pair
energy storing means thereon, conveyance brak
of levers pivoted toy the conveyance frame at
ing means actuated by release of the stored en
ergy, a trigger device for releasing the stored median points and having their adjacent ends
energy, means responsive to excess tension in the resting on the support, springs upholding the
rope for both releasing the rope and actuating outer ends of the levers, rods arranged to be 55
the trigger device, and a selectively frangible stop forced downward by downward movement of the
outer ends of the levers, pins provided by the
device for resisting release of the rope.
7. The combination with a hoist conveyance, of rods actuated by the levers and arranged to- be
energy storing means thereon, conveyance brak
sheared upon said rods being forced downward,
ing means actuated by release of the stored en
all of the rods being arranged to actuate the 60
GO ergy, a king bolt for attachment of the hoist rope braking means, and said levers being arranged to
and supported for endwise movement, a spring release the king bolt upon upward movement of
tending to move it downward from its normal their adjacent ends.
position, a rod extending downward from the
l1. The combination with a hoist conveyance
king bolt, a` support on the king bolt, a pair of of energy storing springs, movable plates between 65
“ levers pivoted to the conveyance frame at me-dian
points and having their adjacent ends resting on
the support, springs upholding the outer ends vof
the levers, rods arranged to be forced downward
by downward movement of the outer ends of the
levers, means responsive to excess tension in the
king bolt for resisting such movement of the
lever ends, all of said rods being arranged to
actuate the braking means, and said levers being
arranged to release the king bolt upon upward
movement of their adjacent ends.
which the springs are compressed, pins carried by
said plates and positioned transversely toy the
direction of movement of the plates by the
springs, a member hooked at each end for engag
ing said pins and thereby holding the plates to 70
gether, conveyance braking means actuated by
release of the energy stored by the springs, and
means responsive to abnormal hoisting conditions
for moving the hooked member and thereby re
75
leasing the pins from the hooks.
4
>aiszaegs
12. The combination with a hoist conveyance,
of energy storing springs, movable plates between
which the springs are compressed, pins carried by
said plates and positioned transversely to the di
rectio-n of movement of the plates by the springs,
a member hooked at each end for engaging said
pins and thereby holding the plates together,
conveyance braking means, a hydraulic transmis
sion actuated by the release of energy stored by
the springs and in turn actuating the braking
means, and means responsive to abnormal hoist
ing conditions for moving the hooked member
and thereby releasing the pins from the hooks.
13. The combination with a hoist conveyance
of elongated brake shoes extending in the direc'
tion of the movement of the conveyance, a plu
rality of hydraulic cylinder and ram sets con
nected to and spaced along each shoe for operat
ing said brake shoes, a hydraulic cylinder and
ram set to actuate said brake sets, and means to
actuate said cylinder and ram set.
FRANZ OTI'O JAECKEL.
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